CN120773798A

CN120773798A - Cart and its joint structure

Info

Publication number: CN120773798A
Application number: CN202510389968.6A
Authority: CN
Inventors: 陈玉彬; 汪尔学
Original assignee: China Wonderland Nurserygoods Co Ltd
Current assignee: China Wonderland Nurserygoods Co Ltd
Priority date: 2024-04-02
Filing date: 2025-03-28
Publication date: 2025-10-14

Abstract

The present application relates to a cart and its joint structure, which includes: a first connecting seat, a second connecting seat and a third connecting seat, the three of which are pivotally connected to each other around an axial direction in sequence, the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, and the third connecting seat is provided with a third limiting column, and the first limiting column, the third limiting column and the second limiting column are arranged in sequence along the circumferential direction; and a first locking member, which is axially movable and arranged between the first connecting seat and the second connecting seat, and has a first locking position and a first releasing position. When the first locking member is in the first locking position, the first connecting seat, the second connecting seat and the third connecting seat are relatively fixed, and the third limiting column abuts against at least one of the first limiting column and the second limiting column; when the first locking member is in the first releasing position, both the first connecting seat and the third connecting seat can pivot relative to the second connecting seat.

Description

Cart and joint structure thereof

Technical Field

The application relates to the technical field of wheel type mobile devices, in particular to a cart and a joint structure thereof.

Background

It has become very common and convenient for families with infants to use carts as an auxiliary care tool when going out. The cart mainly comprises a frame and a seat, and most of the cart and the seat adopt a foldable design. When the cart is not needed, the size of the cart can be reduced by folding the cart frame and the seat, so that the cart is convenient to store or carry. However, although the folding design brings convenience, the conventional folding joint structure is often complex, which causes the folding joint structure to be large in size, occupies a large space, and causes the overall appearance of the cart to be heavy, so that the attractiveness of the cart is affected.

Disclosure of Invention

Based on this, it is necessary to provide a cart and its joint structure in order to solve the above-mentioned problems.

The joint structure comprises a first connecting seat, a second connecting seat and a third connecting seat, wherein the first connecting seat, the second connecting seat and the third connecting seat are mutually pivoted around an axial direction, the second connecting seat is positioned between the first connecting seat and the third connecting seat along the axial direction, the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, the third connecting seat is provided with a third limiting column, the first limiting column, the third limiting column and the second limiting column are sequentially arranged along the circumferential direction, a first locking piece is movably arranged between the first connecting seat and the second connecting seat and provided with a first locking position and a first releasing locking position, the first locking piece is positioned on one radial side of the first limiting column, the second limiting column and the third limiting column, when the first locking piece is positioned at the first locking position, the first connecting seat, the second connecting seat and the third connecting seat are relatively fixed, and the first locking piece can be positioned at the first locking position and the second locking piece is relatively positioned at the first locking position and the third connecting seat.

In one embodiment, the first limiting column protrudes towards the second connecting seat, the second limiting column protrudes towards the first connecting seat, the third limiting column protrudes towards the first connecting seat and penetrates through the second connecting seat, the second connecting seat is provided with a movable groove for enabling the third limiting column to move along the circumferential direction, and the first limiting column and the third limiting column can move along the circumferential direction in the second connecting seat.

In one embodiment, the first locking member is located radially outward of the first, second and third stop posts.

In one embodiment, the joint structure further includes a driving member movably disposed between the first connection seat and the second connection seat and having an initial position and an unlock position, and when the driving member moves from the initial position to the unlock position, the driving member drives the first locking member to move from the first lock position to the first unlock position, the driving member and the first locking member are disposed adjacent to each other in the axial direction, and the driving member and the first locking member are located radially outside the first limit post, the second limit post, and the third limit post.

In one embodiment, the driving member is located between the first connecting seat and the first locking member and is disposed adjacent to the first locking member, and the driving member is used for driving the first locking member to move to the second connecting seat to the first locking position.

In one embodiment, the first, second and third connecting seats are pivotally connected to each other at a first pivot, and the first pivot limits the first, second and third connecting seats from being axially separated.

In one embodiment, when the first locking member is in the first locking position, the first locking member is simultaneously engaged with the first connecting seat and the second connecting seat, and when the first locking member is in the first unlocking position, the first locking member is engaged with the second connecting seat and disengaged from the first connecting seat, so that the first connecting seat can pivot relative to the second connecting seat.

In one embodiment, a first elastic member is disposed between the first locking member and the second connecting seat, and the first elastic member provides an elastic restoring force for the first locking member, so that the first locking member is kept at the first locking position.

In one embodiment, the joint structure further comprises a second locking member movably disposed in the joint structure and provided with at least one locking portion, the locking portion is disposed at an interval from the axial direction, the second locking member has a second locking position and a second unlocking position, when the first locking member is in the first locking position, the second locking member is in the second locking position, the at least one locking portion passes through the third connecting seat and the second connecting seat, when the first locking member is in the first unlocking position, the second locking member is in the second unlocking position, and the at least one locking portion passes through only the third connecting seat or the second connecting seat.

In one embodiment, the first locking member drives the second locking member from the second locking position to the second unlocking position when the first locking member moves from the first locking position to the first unlocking position.

In one embodiment, when the first locking member moves to the second connecting seat, the first locking member drives the at least one locking portion to move to be separated from the second connecting seat, so that the at least one locking portion only passes through the third connecting seat to the second locking releasing position.

The trolley comprises a trolley frame, a front wheel frame, a rear wheel frame and the joint structure, wherein the trolley frame is connected with the first connecting seat, the front wheel frame is connected with the second connecting seat, the rear wheel frame is connected with the third connecting seat, the trolley frame, the front wheel frame and the rear wheel frame are mutually pivoted through the joint structure so that the trolley can be switched between an extending state and a folding state, the rear wheel frame is circumferentially positioned between the front wheel frame and the trolley frame, when the trolley is in the extending state, the first locking piece is in the first locking position, the trolley frame, the front wheel frame and the rear wheel frame are circumferentially arranged at intervals, and when the trolley is in the folding state, the trolley frame is circumferentially close to the rear wheel frame, and the rear wheel frame is circumferentially close to the front wheel frame.

In one embodiment, the first lock is in the first lock release position when the stroller is in the collapsed state.

In one embodiment, when the cart is in the folded state, the first limit post, the third limit post, and the second limit post are disposed at intervals along a circumferential direction.

In one embodiment, when the cart is in the folded state, the third limiting column is circumferentially abutted to a groove wall of the movable groove at one side far away from the second limiting column.

In one embodiment, the first connecting seat is provided with a first clamping piece, the second connecting seat is provided with a second clamping piece, the first clamping piece and the second clamping piece are located between the first limiting column and the second limiting column along the circumference Xiang Jun and located on one side, away from the third limiting column along the circumference, of the first limiting column and the second limiting column, and when the cart is in the folded state, the first clamping piece is in butt joint with the second clamping piece on one side, close to the second limiting column, of the second clamping piece.

In one embodiment, when the cart is in the extended state, the first clamping piece is located at one side of the second clamping piece, which is close to the first limiting column, and is arranged at an interval with the second clamping piece.

In one embodiment, the first clamping piece comprises an elastic arm and a convex hull, the elastic arm is provided with elastic force capable of elastically deforming along the radial direction, the convex hull is located on the radial inner side of the elastic arm, when the cart is in the folded state, the elastic arm is at least partially located on the radial outer side of the second clamping piece, and the convex hull is abutted to the second clamping piece on one side, close to the second limiting column, of the second clamping piece.

In one embodiment, at least one of the first engaging member and the second engaging member is provided with a guiding inclined plane, and when the first connecting seat rotates circumferentially relative to the second connecting seat, the guiding inclined plane is used for guiding the first engaging member to move from one side of the second engaging member, which is close to the first limiting column, to one side of the second engaging member, which is close to the second limiting column.

In one embodiment, a first blocking portion is disposed on the outer side of the second connecting seat, a second blocking portion is disposed on the outer side of the third connecting seat, and when the first locking piece is located at the first unlocking position and the cart is not in the folded state, the first blocking portion and the second blocking portion are in mutual abutting connection along the circumferential direction.

In one embodiment, the first blocking portion is disposed on an outer periphery of the second connecting seat, the first blocking portion extends toward the third connecting seat and is opposite to an outer portion Zhou Waitu of the second connecting seat, the second blocking portion is disposed on an outer periphery of the third connecting seat, and the second blocking portion extends toward the second connecting seat and is opposite to an outer portion Zhou Waitu of the third connecting seat.

In one embodiment, the first connecting seat is provided with a first pushing part, the first pushing part protrudes towards the second connecting seat to form, the first pushing part is arranged with the first limiting column at intervals along the circumferential direction, when the cart is in the folded state, the first pushing part is located between the first limiting column and the third limiting column along the circumferential direction, the third limiting column is located between the first pushing part and the second limiting column along the circumferential direction, and when the cart is switched from the folded state to the stretched state, the first pushing part pushes the third limiting column towards a direction close to the second limiting column.

In one embodiment, when the cart is in the folded state, the first pushing portion is located between the first limit post and the third limit post in the circumferential direction, and when the cart is in the extended state, the third limit post is located between the first limit post and the first pushing portion in the circumferential direction, and the first pushing portion is elastically deformable in the radial direction.

In one embodiment, the second limiting post is located at one side of the track of the first pushing portion moving along the circumferential direction in the direction parallel to the axial direction.

In one embodiment, the plane where the end face of the first pushing portion facing the second connecting seat is located and the plane where the end face of the second limiting post facing the first connecting seat is located are arranged at intervals or just flush along the direction parallel to the axial direction.

In one embodiment, the first pushing portion is provided as an elastic arm, and an extending direction of the elastic arm intersects with the circumferential direction.

In one embodiment, an abutment surface is disposed on a side of the third limiting post, which is close to the first limiting post, and the abutment surface is located on a track along which the first abutment portion moves circumferentially, and when the first abutment portion abuts against the abutment surface, an included angle between an extending direction of the abutment surface and an extending direction of the first abutment portion is between 65 ° and 75 °.

In one embodiment, the first connecting seat is further provided with a fourth limiting column, the fourth limiting column protrudes towards the second connecting seat to form, the fourth limiting column is arranged along the circumferential direction at intervals with the first limiting column, when the cart is in an extending state, the third limiting column is circumferentially located between the first limiting column and the fourth limiting column, when the cart is switched from the extending state to the folding state, the fourth limiting column pushes against the third limiting column, so that the third limiting column moves towards a direction away from the second limiting column.

In one embodiment, when the cart is in the extended state, the fourth limit post is disposed away from the third limit post compared to the second limit post, and the fourth limit post is configured to circumferentially cross the second limit post to push the third limit post to move in a direction away from the second limit post.

In one embodiment, the second limiting post is located at one side of the track of the fourth limiting post moving along the circumferential direction in a direction parallel to the axial direction.

In one embodiment, the plane of the end face of the fourth limiting post facing the second connecting seat and the plane of the end face of the second limiting post facing the first connecting seat are arranged at intervals or just flush along the direction parallel to the axial direction.

In one embodiment, the first pushing portion is located between the first limit post and the fourth limit post in a circumferential direction.

In one embodiment, a distance between the first pushing portion and the fourth limiting post in the circumferential direction is greater than or equal to a maximum width of the third limiting post in the circumferential direction.

In one embodiment, when the cart is in the extended state, the third limit post is located between the first limit post and the first pushing portion in the circumferential direction, and the fourth limit post is disposed farther from the third limit post than the first pushing portion in the circumferential direction.

In one embodiment, a pressure contact surface is disposed on a side of the third limiting post, which is close to the second limiting post, and the pressure contact surface is located on a track along which the first pushing portion moves circumferentially, and when the first pushing portion contacts the pressure contact surface, an included angle between an extending direction of the pressure contact surface and an extending direction of the first pushing portion is between 0 ° and 25 °.

In one embodiment, the cart further comprises a seat and a fourth connecting seat, the fourth connecting seat and the third connecting seat are pivoted to each other around the axial direction, the second connecting seat and the third connecting seat are both located between the first connecting seat and the fourth connecting seat, and the seat is connected with the fourth connecting seat.

In one embodiment, the cart hand frame comprises a first pushing hand frame, a second pushing hand frame and a folding joint, the second pushing hand frame is pivoted with the first pushing hand frame through the folding joint, so that the first pushing hand frame can be unfolded or folded relative to the second pushing hand frame, the cart further comprises a third traction piece, the third traction piece is connected with the first pushing hand frame and the seat, and when the first pushing hand frame is unfolded relative to the second pushing hand frame, the first pushing hand frame drives the seat to rotate along a circumferential direction in a direction far away from the rear wheel frame through the third traction piece.

In one embodiment, the fourth connecting seat is provided with a second pushing part, the second connecting seat is provided with a third pushing part, the second pushing part and the third pushing part are arranged opposite to each other along the circumferential direction, and when the first pushing hand frame drives the seat to rotate along the circumferential direction in the direction far away from the rear wheel frame through the third traction piece, the second pushing part is abutted against the third pushing part so as to drive the front wheel frame to rotate along the circumferential direction in the direction far away from the rear wheel frame.

In one embodiment, the third connecting seat is provided with a limiting groove, at least part of the second pushing part and at least part of the third pushing part protrude into the limiting groove, and the second pushing part and the third pushing part move along the circumferential direction in the limiting groove.

In one embodiment, one end of the limiting groove in the circumferential direction is used for abutting against the second abutting portion, and the other end of the limiting groove in the circumferential direction is used for abutting against the third abutting portion.

In one embodiment, the process of switching the cart from the folded state to the extended state comprises a first stage and a second stage, wherein in the first stage, the handle frame rotates along the direction of the circumference Xiang Chao away from the front wheel frame, the handle frame drives the rear wheel frame to rotate along the circumference in the direction of the distance from the front wheel frame, in the second stage, the first handle frame is unfolded relative to the second handle frame, the first handle frame drives the seat to rotate along the circumference in the direction of the distance from the rear wheel frame through the third traction piece, and the seat drives the front wheel frame to rotate along the circumference in the direction of the distance from the rear wheel frame.

The joint structure comprises a first connecting seat, a second connecting seat and a third connecting seat, wherein the first connecting seat, the second connecting seat and the third connecting seat are mutually pivoted around an axial direction, and the second connecting seat is positioned between the first connecting seat and the third connecting seat along the axial direction; the first locking piece is movably arranged between the first connecting seat and the second connecting seat and is provided with a first locking position and a first unlocking position, when the first locking piece is positioned at the first locking position, the first connecting seat and the second connecting seat are relatively fixed, and when the first locking piece is positioned at the first unlocking position, the first connecting seat can pivot relative to the second connecting seat; the second locking piece is movably arranged in the joint structure and is provided with at least one locking part, the locking part is arranged at intervals from the axial direction, the second locking piece is provided with a second locking position and a second unlocking position, when the second locking piece is positioned at the second locking position, the at least one locking part penetrates through the third connecting seat and the second connecting seat so as to enable the second connecting seat and the third connecting seat to be relatively fixed, when the second locking piece is positioned at the second unlocking position, the at least one locking part only penetrates through the third connecting seat or the second connecting seat so as to enable the second connecting seat to pivot relative to the third connecting seat, and the driving piece is movably arranged between the first connecting seat and the second connecting seat and is provided with an initial position and an unlocking position, when the driving piece moves from the initial position to the unlocking position, the driving piece drives the first locking piece to move from the first locking position to the first unlocking position, and drives the second locking piece to move from the second locking position to the second unlocking position.

In one embodiment, the driving member directly drives the first locking member to move from the first locking position to the first unlocking position when the driving member moves from the initial position to the unlocking position, and drives the second locking member to move from the second locking position to the second unlocking position when the first locking member moves from the first locking position to the first unlocking position.

In one embodiment, the driving member is located between the first connecting seat and the first locking member along the axial direction and is adjacent to the first locking member, and the driving member is used for driving the first locking member to move to the second connecting seat to the first unlocking position, and when the first locking member moves to the second connecting seat, the first locking member drives the at least one locking portion to move to be separated from the second connecting seat, so that the at least one locking portion only passes through the third connecting seat to enable the second locking member to be in the second unlocking position.

In one embodiment, the joint structure further comprises a fourth connecting seat and a third locking piece, wherein the fourth connecting seat and the third connecting seat are mutually pivoted around the axial direction, the second connecting seat and the third connecting seat are both positioned between the first connecting seat and the fourth connecting seat, the third locking piece is movably arranged between the third connecting seat and the fourth connecting seat and provided with a third locking position and a third unlocking position, when the third locking piece is positioned at the third locking position, the third connecting seat and the fourth connecting seat are relatively fixed, when the third locking piece is positioned at the third unlocking position, the third connecting seat can be pivoted relative to the fourth connecting seat, and when the driving piece moves from the initial position to the unlocking position, the driving piece drives the third locking piece to move from the third locking position to the third unlocking position.

In one embodiment, the second locking member drives the third locking member from the third locking position to the third unlocking position when the second locking member moves from the second locking position to the second unlocking position.

In one embodiment, when the at least one locking portion moves to disengage from the second connecting seat, the at least one locking portion drives the third locking member to move to the fourth connecting seat to the third unlocking position.

In one embodiment, when the third locking piece is in the third locking position, the third locking piece is simultaneously clamped with the third connecting seat and the fourth connecting seat, and when the third locking piece is in the third unlocking position, the third locking piece is clamped with the fourth connecting seat and separated from the third connecting seat, so that the fourth connecting seat can pivot relative to the third connecting seat.

In one embodiment, a second elastic member is disposed between the third locking member and the fourth connecting seat, and the second elastic member provides an elastic restoring force for the third locking member, so that the third locking member is kept at the third locking position.

In one embodiment, the second locking member is provided with a main body portion, the at least one locking portion is formed by protruding from the main body portion along a direction parallel to the axial direction, and the main body portion is located between the third connecting seat and the third locking member and is disposed adjacent to the third locking member.

In one embodiment, the second locking member is provided with a plurality of locking portions, and the plurality of locking portions are arranged at intervals along the circumferential direction.

The trolley comprises a trolley frame, a front wheel frame, a rear wheel frame and the joint structure, wherein the trolley frame is connected with a first connecting seat, the front wheel frame is connected with a second connecting seat, the rear wheel frame is connected with a third connecting seat, the trolley frame, the front wheel frame and the rear wheel frame are mutually pivoted through the joint structure so that the trolley can be switched between an extending state and a folding state, the rear wheel frame is circumferentially located between the front wheel frame and the trolley frame, when the trolley is in the extending state, the driving piece is in the initial position, the first locking piece is in the first locking position, the second locking piece is in the second locking position, the trolley frame, the front wheel frame and the rear wheel frame are circumferentially arranged at intervals, and when the trolley is in the folding state, the trolley frame is circumferentially close to the rear wheel frame, and the rear wheel frame is circumferentially close to the front wheel frame.

In one embodiment, when the cart is in the collapsed state, the drive member is in the unlocked position, and the first lock member is in the first unlocked position, and the second lock member is in the second unlocked position.

In one embodiment, a first blocking portion is disposed on the outer side of the second connecting seat, a second blocking portion is disposed on the outer side of the third connecting seat, and when the driving member is located at the unlocking position, the first locking member is located at the first unlocking position, the second locking member is located at the second unlocking position, and the cart is not in the folded state, the first blocking portion and the second blocking portion are in mutual abutting connection along the circumferential direction.

In one embodiment, the handle comprises a first handle, a second handle and a folding joint, wherein the second handle is pivoted with the first handle through the folding joint so that the first handle can be unfolded or folded relative to the second handle, and the folding joint comprises a fifth connecting seat connected with the first handle; the fifth connecting seat is connected with the second pushing handle frame, the sixth connecting seat and the fifth connecting seat are mutually pivoted to enable the first pushing handle frame to be unfolded or folded relative to the second pushing handle frame, one of the fifth connecting seat and the sixth connecting seat is provided with a limiting concave part, the other of the fifth connecting seat and the sixth connecting seat is provided with a fifth locking piece, the fifth locking piece is movably arranged on the other of the fifth connecting seat and the sixth connecting seat and is provided with a first position and a second position, when the fifth locking piece is in the first position, the fifth locking piece stretches into the limiting concave part to enable the first pushing handle frame and the second pushing handle frame to be kept relatively folded, and when the fifth locking piece is in the second position, the fifth locking piece is retracted from the limiting concave part to allow the first pushing handle frame to pivot relative to the second pushing handle frame.

In one embodiment, at least one of an end of the fifth locking piece facing the limit concave portion and the limit concave portion is provided with a sliding inclined surface adapted to release the limit.

In one embodiment, the folding joint further includes a limiting cover and a third elastic member, the fifth connecting seat is provided with a movable hole, the fifth locking member movably penetrates through the movable hole, the limiting cover is arranged on one side, opposite to the sixth connecting seat, of the fifth connecting seat, the third elastic member abuts against between the limiting cover and the fifth locking member, so that the fifth locking member is kept at the first position, and the sixth connecting seat is provided with the limiting concave portion.

In one embodiment, the handle comprises a first handle and a second handle, the second handle is pivoted with the first handle, so that the first handle can be unfolded or folded relative to the second handle, the second handle is connected with the first connecting seat, the driving piece is connected with the first handle through a first traction piece, and when the first handle pivots relative to the second handle, the first handle drives the first traction piece to move so as to drive the driving piece to rotate relative to the first connecting seat and move along the axial direction, so that the driving piece moves from the initial position to the unlocking position.

In one embodiment, the driving piece is provided with an abutting portion, the abutting portion protrudes in a direction parallel to the axial direction and extends obliquely in the circumferential direction, the first connecting seat is provided with a pushing portion, the pushing portion protrudes in the direction parallel to the axial direction and extends obliquely in the circumferential direction, and the abutting portion and the pushing portion are mutually abutted in the direction parallel to the axial direction.

In one embodiment, the handlebar frame comprises a first handlebar frame, a second handlebar frame and a folding joint, wherein the second handlebar frame is pivoted with the first handlebar frame through the folding joint so that the first handlebar frame can be unfolded or folded relative to the second handlebar frame, the folding joint comprises a fifth connecting seat connected with the first handlebar frame, a sixth connecting seat connected with the second handlebar frame, the sixth connecting seat is provided with a locking groove, the sixth connecting seat and the fifth connecting seat are pivoted mutually so that the first handlebar frame can be unfolded or folded relative to the second handlebar frame, and a fourth locking piece is movably arranged on the first handlebar frame and is inserted into the locking groove to limit the first handlebar frame to pivot relative to the second handlebar frame when the first handlebar frame and the second handlebar frame are unfolded relatively.

In one embodiment, the vehicle hand rest further includes a lock release button, where the lock release button is movably disposed on the first hand rest and connected to the fourth locking piece through a second traction piece, and when the lock release button moves relative to the first hand rest, the lock release button drives the fourth locking piece to move relative to the first hand rest so as to be able to be separated from the locking slot.

In one embodiment, the vehicle hand rest further comprises a safety push button movably arranged on the first hand rest and provided with a third position and a fourth position, when the safety push button is positioned at the third position, the safety push button is abutted against the lock release button to prevent the lock release button from moving relative to the first hand rest, and when the safety push button is positioned at the fourth position, the safety push button is spaced from the lock release button to allow the lock release button to move relative to the first hand rest, and the moving direction of the safety push button is staggered with the moving direction of the lock release button.

The trolley comprises a trolley frame, a front wheel frame, a rear wheel frame, a seat and the joint structure, wherein the trolley frame is connected with a first connecting seat, the front wheel frame is connected with a second connecting seat, the rear wheel frame is connected with a third connecting seat, the seat is connected with a fourth connecting seat, the trolley frame, the front wheel frame, the rear wheel frame and the seat are mutually pivoted through the joint structure so that the trolley can be switched between an extending state and a folding state, when the trolley is in the extending state, the trolley frame, the rear wheel frame, the front wheel frame and the seat are sequentially arranged at intervals along the circumferential direction, a driving piece is in the initial position, a first locking piece is in the first locking position, a second locking piece is in the second locking position, a third locking piece is in the third locking position, and when the trolley is in the folding state, the trolley frame, the rear wheel frame and the seat are all close to the front wheel frame along the circumferential direction.

In one embodiment, when the cart is in the collapsed state, the drive member is in the unlocked position, the first lock member is in the first unlocked position, the second lock member is in the second unlocked position, and the third lock member is in the third unlocked position.

In one embodiment, a third blocking portion is disposed on the outer periphery of the third connecting seat, and a fourth blocking portion is disposed on the outer periphery of the fourth connecting seat, and when the third locking member is in the third locking position, the third blocking portion and the fourth blocking portion are in mutual abutment along the circumferential direction.

In one embodiment, the third blocking portion extends toward the fourth connection block and opposite the outer portion Zhou Waitu of the third connection block and the fourth blocking portion extends toward the third connection block and opposite the outer portion Zhou Waitu of the fourth connection block.

In one embodiment, the seat comprises a seat plate, a folding brace penetrating through the seat plate, and a winding mechanism connected with two ends of the folding brace, wherein the two ends of the folding brace respectively penetrate through the seat plate to extend from a first surface to a second surface of the seat plate and are connected to the winding mechanism arranged on the second surface, the winding mechanism automatically tightens the folding brace, and the first surface and the second surface are opposite to each other.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Moreover, the figures are not drawn to a 1:1 scale, and the relative sizes of various elements are merely exemplary in the figures, and are not necessarily drawn to true scale. In the drawings:

FIG. 1 is a perspective view of a cart according to an embodiment of the present application;

FIG. 2 is a perspective view of another view of a cart according to an embodiment of the application;

FIG. 3 is a cross-sectional view of a cart in an embodiment of the application, wherein the cart is in an extended state;

FIG. 4 is an enlarged view at circle A of FIG. 3;

FIG. 5 is a partial perspective view of the stroller with a stroller frame shown in FIG. 1;

FIG. 6 is an exploded view of a portion of the structure of the cart in the cart of FIG. 1;

FIG. 7 is a partial perspective view of the cart in FIG. 1 from another perspective with the cart handle;

FIG. 8 is a cross-sectional view taken along line U1-U1 of FIG. 7;

FIG. 9 is a cross-sectional view taken along line U2-U2 of FIG. 7;

FIG. 10 is an enlarged view at circle B of FIG. 9;

FIG. 11 is a cross-sectional view of the vehicle handle with the fifth lock of FIG. 10 extending into the limit recess;

FIG. 12 is a side view of a cart with a first pushing frame folded relative to a second pushing frame according to an embodiment of the application;

FIG. 13 is a cross-sectional view of a cart in accordance with an embodiment of the present application, wherein the handle bar is folded toward the front wheel frame and the rear wheel frame;

FIG. 14 is a cross-sectional view of a cart in a collapsed condition according to an embodiment of the application;

FIG. 15 is a partially exploded perspective view of a cart according to an embodiment of the application, showing the articulation structure of the first embodiment;

FIG. 16 is an enlarged view at circle C of FIG. 15;

FIG. 17 is an enlarged view of FIG. 15 at circle D;

FIG. 18 is a partially exploded perspective view of another view of a cart according to an embodiment of the application, showing the articulation structure of the first embodiment;

FIG. 19 is a cross-sectional view taken along line U3-U3 of FIG. 1;

FIG. 20 is a cross-sectional view taken along line U4-U4 of FIG. 12;

FIG. 21 is a perspective view of the first connector holder of FIG. 15 from another perspective;

FIG. 22 is a perspective view of the second connector of FIG. 15 from another perspective;

FIG. 23 is a perspective view of the third connector of FIG. 15 from another perspective;

FIG. 24 is a perspective view of a seat according to an embodiment of the present application;

FIG. 25 is a schematic view of a portion of the seat winding mechanism of FIG. 24;

FIG. 26 is a cross-sectional view taken along line U5-U5 of FIG. 24;

FIG. 27 is a bottom view of a seat in another embodiment of the application;

FIG. 28 is a cross-sectional view of the seat shown in FIG. 27;

FIG. 29 is an exploded view of a joint structure according to a second embodiment of the present application;

FIG. 30 is an exploded view of a joint structure according to a sixth embodiment of the present application;

FIG. 31 is an exploded view of a joint structure according to a seventh embodiment of the present application;

FIG. 32 is an exploded view of a joint structure according to an eighth embodiment of the present application;

FIG. 33 is an exploded view of a joint construction in a ninth embodiment of the present application;

FIG. 34 is an exploded view of a joint structure according to a tenth embodiment of the present application;

FIG. 35 is an exploded view of a joint structure according to an eleventh embodiment of the present application;

Fig. 36 is a perspective view of a first joint base of the joint structure according to the eleventh embodiment of the present application;

FIG. 37 is a partially exploded view of an alternative angle of articulation in an eleventh embodiment of the present application, with only the first, second and third connecting members remaining in FIG. 37;

FIG. 38 is a cross-sectional view of a cart in a collapsed condition according to an eleventh embodiment of the application;

FIG. 39 is a cross-sectional view of a third stop post in an eleventh embodiment of the application;

FIG. 40 is a perspective cross-sectional view of the stroller in an extended state in accordance with the eleventh embodiment of the present application, and in particular, FIG. 40 shows a cross-sectional view of the knuckle structure, the handlebar and the front wheel frame;

fig. 41 is a cross-sectional view of the cart in a folded state and an extended state, and in particular, fig. 41 is a cross-sectional view of a joint structure according to an eleventh embodiment of the present application.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

An embodiment of the present invention provides a cart 1000, where the cart 1000 may include a frame 100 and a cloth cover (not shown) sleeved on the frame 100. The frame 100 may include a handlebar frame 110, a front wheel frame 120, a rear wheel frame 130, and an articulation structure 200 provided in some embodiments of the present invention. The joint structure 200 will be described together with the description of the cart 1000 and the frame 100.

Fig. 1 and 2 show a cart 1000 according to an embodiment of the present invention, in which a frame 100 of the cart 1000 is substantially bilaterally symmetrical in structure, and a handle frame 110, a front wheel frame 120, and a rear wheel frame 130 of the frame 100 are respectively connected to two joint structures 200. Wherein, the cart 1000 enables the handle 110, the front wheel frame 120, and the rear wheel frame 130 connected to the joint structures 200 to rotate relative to each other by the two joint structures 200 located at the left and right sides, thereby enabling the handle 110, the front wheel frame 120, and the rear wheel frame 130 to be relatively unfolded and folded, in other words, enabling the cart 1000 to have an extended state (see fig. 1 and 2) and a folded state (see fig. 14). When the cart 1000 is needed to be used, the cart 1000 can be in an extending state, and when the cart 1000 is needed to be stored, the cart 1000 can be in a folding state, so that occupied space is saved, and storage is convenient.

Referring to fig. 1 and 2, in an embodiment, each of the above-mentioned joint structures 200 may include a first connecting seat 210, a second connecting seat 220, and a third connecting seat 230, where the first connecting seat 210, the second connecting seat 220, and the third connecting seat 230 are pivoted to each other around an axial direction (a circumferential direction around the axial direction, and a direction perpendicular to the axial direction is a radial direction), and at least a portion of the second connecting seat 220 is axially located between the first connecting seat 210 and the third connecting seat 230, so that the cart 1000 has an extended state and a folded state. The first connecting seat 210 is used for connecting with the handlebar 110, the second connecting seat 220 is used for connecting with the front wheel frame 120, and the third connecting seat 230 is used for connecting with the rear wheel frame 130, so that the cart 1000 can be switched between an extended state and a folded state. Of course, in other embodiments, the second connecting seat 220 may be used to connect with the rear wheel frame 130, and the third connecting seat 230 may be used to connect with the front wheel frame 120, so that the cart 1000 may be switched between the extended state and the folded state. Specifically, when the cart 1000 is in the extended state, the handle frame 110, the front wheel frame 120, and the rear wheel frame 130 are disposed at intervals in the circumferential direction, and the rear wheel frame 130 is located between the front wheel frame 120 and the handle frame 110 in the circumferential direction, with a first angle α1 being disposed between the front wheel frame 120 and the rear wheel frame 130 (see fig. 3), and with a second angle α2 being disposed between the handle frame 110 and the front wheel frame 120 (see fig. 3). When the cart 1000 is in the folded state, the handle frame 110 is circumferentially close to the rear wheel frame 130, the rear wheel frame 130 is circumferentially close to the front wheel frame 120, a third included angle α3 is formed between the front wheel frame 120 and the rear wheel frame 130 (see fig. 14), and a fourth included angle α4 is formed between the handle frame 110 and the front wheel frame 120 (see fig. 14). Wherein, the third included angle α3 is smaller than the first included angle α1, and the fourth included angle α4 is smaller than the second included angle α2.

In order to clearly understand the structure of the cart 1000 according to the present invention, the specific structure of the front wheel frame 120, the rear wheel frame 130, the handle frame 110, and each of the joint structures 200 will be further described one by one.

Referring to fig. 1 and 2, in an embodiment, the front wheel frame 120 has, for example, a U-shaped structure including front bars 121 located at left and right sides and a front cross bar 122 connected between the two front bars 121. The front rail 122 extends substantially along a first direction F1, which corresponds to the left-right direction of the cart 1000. The front rail 122 may also be used as a foot pedal when a child sits on the cart 1000.

In one embodiment, the cart 1000 further includes at least one front wheel mount 141 mounted to the bottom of the front wheel frame 120. Specifically, in the present embodiment, as shown in fig. 1 and 2, the cart 1000 includes two front wheel seats 141 mounted to the bottom of the front wheel frame 120, the two front wheel seats 141 being disposed at intervals in the left-right direction (i.e., the first direction F1). More specifically, two front wheel seats 141 are installed at both left and right ends of the front rail 122, and two front bars 121 are respectively connected to the front wheel seats 141 on the same side. The cart 1000 further includes at least one front wheel 151 mounted to the front wheel mount 141 to make the cart 1000 movable. Specifically, in the present embodiment, the cart 1000 includes two front wheels 151, and each front wheel mount 141 is for mounting one front wheel 151. Wherein the front wheel 151 may be a universal wheel or a non-universal wheel. Of course, in other embodiments, the front wheel frame 120 may have other embodiments, for example, the front wheel frame 120 includes only two front rods 121, one ends of the two front rods 121 are connected to form a V-shaped structure, the cart 1000 may be provided with a front wheel seat 141 at the end where the two front rods 121 are connected, and the front wheel seat 141 is connected to a front wheel 151.

Unless specifically stated and limited otherwise, the terms of the "left", "right", etc. of the orientation of the cart 1000 in the various embodiments of the present invention are based on the "left", "right" orientation of the cart 1000 that is normally traveling, and the "left", "right" directions are schematically shown by arrows L, R in the drawings. These directional terms are used only to make the description of the embodiments of the present invention clearer and are not used to unduly limit the scope of the present invention.

With continued reference to fig. 1 and 2, the rear wheel frame 130 may include two rear bars 131 located at left and right sides and a rear cross bar 132 connected between the two rear bars 131, the two rear bars 131 at left and right sides being respectively connected with the front bars 121 at the same side through corresponding joint structures 200, the rear cross bar 132 extending along the first direction F1. Specifically, the rear cross bars 132 have two, and the two rear cross bars 132 are disposed at intervals along the length direction of the rear lever 131. The cart 1000 further includes at least one rear wheel mount 142 mounted to the bottom of the rear wheel mount 130. Specifically, in the present embodiment, the cart 1000 includes two rear wheel seats 142 mounted to the bottom of the rear wheel frame 130, the two rear wheel seats 142 being disposed at intervals in the left-right direction (i.e., the first direction F1). More specifically, two rear wheel seats 142 are installed at both left and right ends of the rear rail 132 at the end of the rear bar 131, and the two rear bars 131 are respectively connected to the rear wheel seats 142 at the same side. The cart 1000 also includes a rear wheel 152 mounted to the rear wheel mount 142 to make the cart 1000 movable. Specifically, in the present embodiment, the cart 1000 includes two rear wheels 152, each rear wheel seat 142 for mounting one rear wheel 152, wherein the rear wheels 152 may be, for example, universal wheels or non-universal wheels. In the present embodiment, the rear wheels 152 are larger in size than the front wheels 151 to make the overall structure of the cart 1000 more stable. Of course, in other embodiments, the rear wheels 152 may be the same size as the front wheels 151 or smaller than the front wheels 151.

Alternatively, in other embodiments, the rear wheel frame 130 may have other embodiments, for example, the rear wheel frame 130 includes only two rear bars 131, one ends of the two rear bars 131 are connected to form a V-shaped structure, and the cart 1000 is provided with one rear wheel seat 142 at the end where the two rear bars 131 are connected. Alternatively, for example, the rear wheel frame 130 includes only two rear bars 131 disposed in parallel in the left-right direction, and the two rear wheel seats 142 are respectively connected to the two rear bars 131.

Referring to fig. 1 and 2, the handle 110 includes a first push handle 111, a second push handle 112, and two folding joints 113. The second pushing frame 112 is pivotally connected to the first pushing frame 111 through two folding joints 113 at the left and right sides, so that the first pushing frame 111 can be unfolded (see fig. 3) or folded (see fig. 12 to 14) relative to the second pushing frame 112. Specifically, the first hand rest 111 has, for example, an overall U-shaped structure, which includes a hand rest 1112 and two first support rods 1111. The two first support rods 1111 are disposed parallel to each other and spaced apart along the first direction F1, and the push rod 1112 is U-shaped and connected between the two first support rods 1111 for being held by a user to push the cart 1000. More specifically, the second hand pushing frame 112 includes, for example, two second support rods 1121, where the two second support rods 1121 are disposed at intervals along the first direction F1, and upper ends of the two second support rods 1121 are respectively pivoted with lower ends of the first support rods 1111 on the same side through the folding joints 113 on the same side, and lower ends of the two second support rods 1121 are respectively connected with the first connecting seats 210 in the joint structure 200 on the same side.

Referring to fig. 4 to 6, in an embodiment, each folding joint 113 includes a fifth connection seat 1131, a sixth connection seat 1132, and a fourth locking member 1133. The fifth connection seat 1131 is connected with the first pushing frame 111 (specifically, the first supporting rod 1111), the sixth connection seat 1132 is connected with the second pushing frame 112 (specifically, the second supporting rod 1121), and the sixth connection seat 1132 and the fifth connection seat 1131 are pivoted with each other through the second pivot 1137, so that the first pushing frame 111 can be unfolded or folded relative to the second pushing frame 112. In order to prevent the first pushing frame 111 from rotating freely relative to the second pushing frame 112, in an embodiment, as shown in fig. 4 and 6, the sixth connecting seat 1132 is provided with a locking groove 11321, and the fourth locking member 1133 is movably disposed on the first pushing frame 111. When the first pushing frame 111 and the second pushing frame 112 are relatively unfolded, the first pushing frame 111 is substantially parallel to the second pushing frame 112, i.e. the first pushing frame 111 and the second pushing frame 112 are substantially in the same plane, and an included angle between the first pushing frame 111 and the second pushing frame 112 is substantially 180 degrees (see fig. 2 and 3). At this time, the fourth locking member 1133 may be inserted into the locking groove 11321 to limit the first pushing frame 111 from pivoting relative to the second pushing frame 112, so that the first pushing frame 111 may be stably kept relatively unfolded relative to the second pushing frame 112. When the fourth locking member 1133 is withdrawn from the locking groove 11321, the first pushing frame 111 may pivot relative to the second pushing frame 112 to fold, and the included angle between the first pushing frame 111 and the second pushing frame 112 is an acute angle (see fig. 13 and 14) or tends to be 0 degrees. Of course, in other embodiments, when the cart 1000 is in the extended state, the included angle between the first pushing frame 111 and the second pushing frame 112 may be an obtuse angle or an acute angle, which is not limited herein.

To facilitate controlling the fourth locking member 1133 to retract from the locking groove 11321 so that the first pushing frame 111 can be folded relative to the second pushing frame 112, in one embodiment, as shown in fig. 1, 3 and 4, the handle 110 further includes a lock release button 161 and a second traction member 162. The lock release button 161 is movably disposed on the first pushing frame 111 and is connected to the fourth locking member 1133 through the second traction member 162. When the lock release button 161 moves relative to the first pushing frame 111, the lock release button 161 drives the fourth locking member 1133 to move relative to the first pushing frame 111 through the second traction member 162 so as to be capable of disengaging from the locking groove 11321. The second traction member 162 may be, for example, a traction rope, and one end thereof is connected to the lock release button 161, and the other end thereof is connected to the fourth locking member 1133. Specifically, as shown in fig. 7 and 8, the lock release button 161 includes an operating portion 1612, the handlebar 110 further includes a driving wheel 1611, the driving wheel 1611 is rotatably disposed on the first handlebar 111 and is connected to one end of the second traction member 162, and the operating portion 1612 is movably disposed on the first handlebar 111 and is connected to the driving wheel 1611, such that the lock release button 161 is indirectly connected to one end of the second traction member 162 through the driving wheel 161. When the operating portion 1612 moves relative to the first pushing frame 111, it can drive the driving wheel 1611 to rotate relative to the first pushing frame 111, and further pull the second pulling member 162 to move so as to withdraw the fourth locking member 1133 from the locking slot 11321.

Referring to fig. 3 and 4, in an embodiment, the handlebar 110 further includes a fourth elastic member 163 disposed on the first handlebar 111, where the fourth elastic member 163 is, for example, a compression spring and abuts against the fourth locking member 1133, and is used to drive the fourth locking member 1133 to return, so that the fourth locking member 1133 constantly has a tendency to be inserted into the locking slot 11321.

Referring to fig. 8, in an embodiment, the handlebar 110 further includes a safety push button 164, where the safety push button 164 is movably disposed on the first handlebar 111 and has a third position and a fourth position. When the safety push button 164 is in the third position, the safety push button 164 abuts against the lock release button 161 to prevent the lock release button 161 from moving relative to the first push frame 111. Specifically, the safety knob 164 is used to abut against the operating portion 1612, so as to prevent the operating portion 1612 from moving relative to the first pushing frame 111, and further prevent the driving wheel 1611 from rotating to drive the second traction member 162 to move. When the safety push button 164 is in the fourth position, the safety push button 164 is spaced apart from the release button 161 to allow the release button 161 to move relative to the first push handle 111. The moving direction of the safety push button 164 is staggered with the moving direction of the lock release button 161. Therefore, when the user needs to pivot the first pushing frame 111 relative to the second pushing frame 112 to fold, the safety push button 164 needs to be operated (e.g. shifted) first, and after the safety push button 164 is located at the fourth position, the operating portion 1612 is operated (e.g. pressed) to withdraw the fourth locking member 1133 from the locking groove 11321. Thus, the user can be prevented from accidentally folding the handle 110 by operating the lock release button 161 by mistake.

Referring to fig. 6 and fig. 9 to fig. 11, in an embodiment, each folding joint 113 further includes a fifth locking member 1134, one of the fifth connection seat 1131 and the sixth connection seat 1132 is provided with a limit recess 11322, the other is provided with the fifth locking member 1134, and the fifth locking member 1134 is movably disposed and has a first position and a second position. In particular, in the present embodiment, as shown in fig. 6, a limiting recess 11322 is disposed on the sixth connecting seat 1132, and the limiting recess 11322 is disposed at intervals from the locking groove 11321 along the circumferential direction around the second pivot 1137, and the fifth locking member 1134 is movably disposed on the fifth connecting seat 1131. As shown in fig. 11, when the first pushing frame 111 is folded relative to the second pushing frame 112 and the fifth locking member 1134 is at the first position, the fifth locking member 1134 extends into the limiting recess 11322, so that the first pushing frame 111 and the second pushing frame 112 can be kept relatively folded, and the first pushing frame 111 can be prevented from being pivoted at will relative to the second pushing frame 112 after the folding of the vehicle handle 110. As shown in fig. 9 and 10, when the fifth lock 1134 is in the second position, the fifth lock 1134 is retracted from the limit recess 11322, which may allow the first push handle 111 to pivot relative to the second push handle 112 to extend the handle 110.

Referring to fig. 6, 10 and 11, in the present embodiment, the folding joint 113 further includes a limiting cover 1135 and a third elastic member 1136. Specifically, the fifth connection seat 1131 is provided with a movable hole 11311, and the fifth locking member 1134 movably penetrates the movable hole 11311. The limiting cover 1135 is disposed on a side of the fifth connection seat 1131 facing away from the sixth connection seat 1132, and the third elastic member 1136 abuts between the limiting cover 1135 and the fifth locking member 1134, so as to keep the fifth locking member 1134 in the first position.

With continued reference to fig. 6, 10 and 11, in one embodiment, at least one of the end of the fifth lock 1134 facing the limit recess 11322 and the limit recess 11322 is provided with a sliding ramp 11341 adapted to release the limit. Specifically, a sliding inclined surface 11341 is disposed at an end of the fifth locking member 1134 facing the limiting recess 11322, and a sliding inclined surface 11341 is also disposed on an inner wall of the limiting recess 11322. In this way, the fifth locking element 1134 can push the limiting recess 11322 through the sliding inclined surface 11341, so that when the sixth connecting seat 1132 drives the limiting recess 11322 to rotate relative to the fifth connecting seat 1131, the fifth locking element 1134 can move out of the limiting recess 11322 in a direction away from the sixth connecting seat 1132, that is, the fifth locking element 1134 is correspondingly moved from the first position to the second position.

The following briefly describes the operation and operation of the folding joint 113 with reference to fig. 3 to 11.

Referring to fig. 3,4 and 10, when the handle 110 is unfolded, that is, when the first handle 111 and the second handle 112 are unfolded relatively, the first handle 111 and the second handle 112 are substantially in the same plane, and an included angle between the two is substantially 180 degrees. At this time, the locking groove 11321 on the sixth connection seat 1132 is opposite to the fourth locking member 1133, and the fourth locking member 1133 is inserted into the locking groove 11321 under the action of the fourth elastic member 163, so as to limit the pivoting of the fifth connection seat 1131 relative to the sixth connection seat 1132. Meanwhile, the fifth locking element 1134 abuts against the surface of the sixth connecting seat 1132 under the action of the third elastic element 1136.

Referring to fig. 7 and 8, when the user needs to fold the handle 110, the user first dials the safety knob 164 to place the safety knob 164 in the fourth position and then presses the operating portion 1612 upward. The operating portion 1612 pushes the driving wheel 1611 to rotate, so as to drive the second traction member 162 to move and drive the fourth locking member 1133 to move towards a direction away from the sixth connecting seat 1132, so that the fourth locking member 1133 is retracted from the locking groove 11321. At this time, the user may rotate the first pushing frame 111 to fold the first pushing frame 111 relative to the second pushing frame 112. When the first pushing frame 111 is folded relative to the second pushing frame 112, the limiting recess 11322 is opposite to the fifth locking member 1134, and the third elastic member 1136 drives the fifth locking member 1134 to automatically insert into the limiting recess 11322 (see fig. 11), so that the first pushing frame 111 can be kept in a relatively folded state relative to the second pushing frame 112.

Referring to fig. 6, 10 and 11, since the fifth locking member 1134 and the limiting recess 11322 are both provided with the sliding inclined surface 11341, when the user needs to unfold the handlebar 110, the user can directly rotate the first handlebar 111, and under the guiding action of the sliding inclined surface 11341, the fifth locking member 1134 can gradually move relative to the limiting recess 11322 and gradually withdraw from the limiting recess 11322. When the first push handle 111 is unfolded with respect to the second push handle 112, the fourth elastic member 163 drives the fourth locking member 1133 to be inserted into the locking groove 11321, so that the handle 110 is maintained in the unfolded state.

Referring to fig. 1 and 2, in the joint structure 200 provided in the first embodiment, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are pivoted to each other on the first pivot (not shown in the drawings, the axis extending direction of the first pivot is the axial direction), so that the movement of the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 along the axial direction can be limited, the mutual separation or separation between the three along the axial direction is avoided, and the stability of the joint structure 200 and the cart 1000 structure is improved.

Referring to fig. 15 to 18, in the first embodiment, the joint structure 200 further includes a first locking member 240, a second locking member 280, and a driving member 250. The first locking member 240 is movably disposed between the first connecting seat 210 and the second connecting seat 220 along an axial direction, and has a first locking position and a first unlocking position. Specifically, when the first locking member 240 is in the first locking position, the first and second connection seats 210 and 220 are relatively fixed. When the first locking member 240 is in the first unlocking position, the first connecting base 210 may pivot with respect to the second connecting base 220. The second locking member 280 is movably disposed in the joint structure 200 along an axial direction, and is provided with at least one locking portion 281, and the at least one locking portion 281 extends along a direction parallel to the axial direction. The second locking member 280 has a second locking position and a second unlocking position, when the second locking member 280 is in the second locking position, the at least one locking portion 281 passes through the third coupling seat 230 and the second coupling seat 220 in a direction parallel to the axial direction, and the locking portion 281 is disposed at a radial interval from the first pivot shaft. In this way, the second connection holder 220 is restricted from rotating about the first pivot with respect to the third connection holder 230, so that the second connection holder 220 and the third connection holder 230 are relatively fixed. When the second locking member 280 is at the second locking position, the locking portion 281 only passes through the third connecting seat 230 or the second connecting seat 220 in a direction parallel to the axial direction, so that the second connecting seat 220 can pivot relative to the third connecting seat 230. The driving member 250 is sleeved outside the first pivot and can rotate around the first pivot, and can be axially movably arranged between the first connecting seat 210 and the second connecting seat 220, and has an initial position and an unlocking position. When the driving member 250 moves from the initial position to the unlocking position, the driving member 250 drives the first locking member 240 to move from the first locking position to the first unlocking position, and drives the second locking member 280 to move from the second locking position to the second unlocking position. In this way, the positions of the first locking member 240 and the second locking member 280 can be changed by changing the position of the driving member 250, so that the relative states among the first connection base 210, the second connection base 220, and the third connection base 230 can be changed, i.e., the cart 1000 can be switched between the extended state and the folded state.

Note that, the "at least one locking portion 281" mentioned above means that the locking portion 281 may be one, two, or more, for example, and when a plurality of locking portions 281 are provided, the plurality of locking portions 281 may be disposed at intervals around the circumferential direction. Specifically, in the present embodiment, the second locking member 280 is provided with a main body portion 282, and the locking portion 281 is formed protruding from the main body portion 282 in a direction parallel to the axial direction. More specifically, the main body 282 has an annular structure for the first pivot to pass through, and the first pivot is located at the center of the main body 282. The second locking member 280 is provided with a plurality of locking portions 281, and the plurality of locking portions 281 are provided at intervals on the circumferential edge of the main body portion 282. In this way, the plurality of locking portions 281 simultaneously penetrate through the third connecting seat 230 and the second connecting seat 220, so as to further limit the rotational movement of the second connecting seat 220 relative to the third connecting seat 230 about the first pivot, thereby improving the stability of the second locking member 280 locking the second connecting seat 220 and the third connecting seat 230.

Referring to fig. 17, the second locking member 280 is provided with a plurality of engagement portions 283 extending radially from the main body portion 282, the plurality of engagement portions 283 being circumferentially spaced apart.

In the present embodiment, the driving member 250 is disposed adjacent to the first locking member 240, and when the driving member 250 moves from the initial position to the unlocking position, the driving member 250 directly drives the first locking member 240 to move from the first locking position to the first unlocking position, and when the first locking member 240 moves from the first locking position to the first unlocking position, the first locking member 240 directly drives the second locking member 280 to move from the second locking position to the second unlocking position. In other words, in the present embodiment, when the driving member 250 moves from the initial position to the unlocked position, the driving member 250 directly drives the first locking member 240 from the first locking position to the first unlocking position, and at the same time, the second locking member 280 may also be indirectly driven by the first locking member 240 from the second locking position to the second unlocking position.

Referring to fig. 15 and 16, in an embodiment, the driving member 250 is configured to drive the first locking member 240 to move to the second connecting seat 220 in the positive axial direction so as to reach the first unlocking position. As shown in fig. 19, when the first locking member 240 is at the first locking position, the first locking member 240 is simultaneously engaged with the first connecting seat 210 and the second connecting seat 220, so that the first connecting seat 210 and the second connecting seat 220 remain relatively fixed. As shown in fig. 20, when the first locking member 240 is at the first locking position, the first locking member 240 is engaged with the second connecting seat 220 and disengaged from the first connecting seat 210, so that the first connecting seat 210 can pivot relative to the second connecting seat 220. It should be noted that, in the present embodiment, the first locking position of the first locking member 240 can be regarded as that the first locking member 240 is located in the second connecting seat 220.

Specifically, the first locking member 240 is a gear structure and is configured to allow the first pivot to pass through. As shown in fig. 21 and 22, a side of the first connecting seat 210 facing the second connecting seat 220 is provided with a first substantially annular accommodating space 212 and a plurality of first locking grooves 213 arranged at intervals along the circumferential direction and arranged at the periphery of the first accommodating space 212. The second connecting seat 220 is provided with a second substantially annular accommodating space 222 on a side facing the first connecting seat 210, and a plurality of second locking grooves 223 circumferentially spaced apart from each other and arranged on the periphery of the second accommodating space 222. When the first locking member 240 is at the first locking position, one end of the first locking member 240 in the axial direction is located in the first accommodating space 212, and the other end is located in the second accommodating space 222 (see fig. 19), so that the plurality of teeth on the outer periphery of the first locking member 240 are simultaneously accommodated in the plurality of first locking grooves 213 and the plurality of second locking grooves 223 in the direction parallel to the axial direction. When the first locking member 240 is at the first unlocking position, the first locking member 240 is completely moved into the second accommodating space 222 (see fig. 20), and the plurality of teeth on the outer periphery of the first locking member 240 are only accommodated in the plurality of second locking grooves 223 along the direction parallel to the axial direction.

The "positive direction along the axial direction" refers to a direction along the axial direction from the first connection base 210 to the third connection base 230. Correspondingly, the direction of movement in the axial direction from the third connection socket 230 to the first connection socket 210 may be regarded as the opposite direction in the axial direction.

Referring to fig. 16 to 18, in the present embodiment, the main body portion 282 of the second locking member 280 is located at a side of the third connecting seat 230 facing away from the second connecting seat 220. When the second locking member 280 is at the second locking position, the locking portion 281 sequentially passes through the third connection seat 230 and the second connection seat 220 in a direction parallel to the axial direction. Therefore, when the first locking member 240 moves from the first locking position to the first unlocking position, the first locking member 240 drives the locking portion 281 to move in a direction parallel to the positive axial direction until the locking portion 281 is separated from the second connecting seat 220, so that the locking portion 281 passes through only the third connecting seat 230 to reach the second unlocking position. It should be noted that, in the present embodiment, the second locking position of the second locking member 280 may be regarded as that the second locking member 280 is located only between the third connecting seat 230 and the fourth connecting seat 290 (see later) or only within the fourth connecting seat 290.

Referring to fig. 2 and 15-18, in an embodiment, the joint structure 200 further includes a fourth connecting seat 290 and a third locking member 310. The fourth connecting seat 290 and the third connecting seat 230 are pivoted to each other around the axial direction, that is, the fourth connecting seat 290 is pivoted to the first pivot. And the second connection seat 220 and the third connection seat 230 are both positioned between the first connection seat 210 and the fourth connection seat 290. The third locking member 310 is movably disposed between the third connecting seat 230 and the fourth connecting seat 290 along the axial direction, and has a third locking position and a third unlocking position. Specifically, when the third locking member 310 is in the third locking position, the third connecting seat 230 and the fourth connecting seat 290 are relatively fixed, and when the third locking member 310 is in the third unlocking position, the third connecting seat 230 may pivot with respect to the fourth connecting seat 290. When the driving member 250 moves from the initial position to the unlocking position, the driving member 250 drives the third locking member 310 to move from the third locking position to the third unlocking position.

Although in the present embodiment, the first, second, third and fourth connection seats 210, 220, 230 and 290 are all rotated around the axial direction. In other embodiments, however, it may be that the first and second connection seats 210 and 220 rotate about a first axial direction, the second and third connection seats 220 and 230 rotate about a second axial direction, and the third and fourth connection seats 230 and 290 rotate about a third axial direction, the first, second and third axial directions being parallel to each other but not coaxial. Or the first, second and third connection seats 210, 220 and 230 rotate about a first axial direction, and the fourth and third connection seats 290 and 230 rotate about a second axial direction, wherein the first and second axial directions are parallel to each other but not coaxial.

It should be noted that, in the present embodiment, the driving member 250 drives the third locking member 310 to move from the third locking position to the third unlocking position by an indirect driving manner. For example, the driving member 250 indirectly drives the movement of the third locking member 310 through the second locking member 280. Specifically, as shown in fig. 17 and 18, the main body portion 282 of the second locking member 280 is located between the third locking member 310 and the third connecting seat 230. When the second locking member 280 moves from the second locking position to the second unlocking position, the second locking member 280 directly drives the third locking member 310 to move from the third locking position to the third unlocking position (switching from fig. 19 to fig. 20). Thus, in the present embodiment, when the driving member 250 moves from the initial position to the unlock position, it directly drives the first locking member 240 away from the first locking position to reach the first unlocking position. Then, with the first locking member 240 unlocked, the driving member 250 continues to indirectly move the second locking member 280 from the second locking position to the second unlocking position. Finally, the third locking member 310 is enabled to move from the third locking position to the third unlocking position by further transfer of the second locking member 280.

In an embodiment, when the locking portion 281 on the third locking member 310 moves to disengage from the second connecting seat 220, the locking portion 281 drives the third locking member 310 to move to the fourth connecting seat 290 to the third locking position along the positive axial direction. In other words, the third unlocked position of the third locking member 310 can be regarded as the third locking member 310 being located in the fourth connecting seat 290. Specifically, when the third locking member 310 is in the third locking position, the third locking member 310 is simultaneously engaged with the third and fourth connection seats 230 and 290. When the third locking member 310 is in the third locking position, the third locking member 310 is engaged with the fourth connecting seat 290 and is separated from the third connecting seat 230, and the fourth connecting seat 290 can pivot relative to the third connecting seat 230.

Specifically, the third locking member 310 is a gear structure and is configured to allow the first pivot to pass through. As shown in fig. 17, 19 and 20, a side of the third connecting seat 230 facing the fourth connecting seat 290 is provided with a third substantially annular accommodating space 232 and a plurality of third locking grooves 233 arranged at intervals along the circumferential direction and arranged at the periphery of the third accommodating space 232. The fourth connection seat 290 is provided with a substantially annular fourth accommodation space 291 facing the third connection seat 230, and a plurality of fourth locking grooves 292 disposed at intervals along the circumferential direction and disposed at the periphery of the fourth accommodation space 291. When the third locking member 310 is at the third locking position, one end of the third locking member 310 in the axial direction is located in the third accommodating space 232, and the other end is located in the fourth accommodating space 291 (see fig. 19), so that the plurality of teeth on the outer periphery of the third locking member 310 are simultaneously accommodated in the plurality of third locking grooves 233 and the plurality of fourth locking grooves 292 in the direction parallel to the axial direction. When the third locking member 310 is at the third unlocking position, the third locking member 310 is completely moved into the fourth receiving space 291 (see fig. 20), and the plurality of teeth on the outer periphery of the third locking member 310 are only received in the plurality of fourth locking grooves 292 in the direction parallel to the axial direction.

Referring to fig. 15 to 18, in an embodiment, a first elastic member 260 is disposed between the first locking member 240 and the second connection seat 220, and the first elastic member 260 provides an elastic restoring force to the first locking member 240 so as to maintain the first locking member 240 in the first locking position. In this way, under the restoring force of the first elastic member 260, the first locking member 240 is automatically moved from the first unlocking position to the first locking position, and thus the driving member 250 is moved from the unlocking position to the initial position. Alternatively, the first elastic member 260 is a compression spring, and two ends thereof are abutted between the second connecting seat 220 and the first locking member 240.

With continued reference to fig. 15 to 18, in an embodiment, a second elastic member 320 is disposed between the third locking member 310 and the fourth connecting seat 290. The second elastic member 320 provides an elastic restoring force to the third locking member 310 to maintain the third locking member 310 in the third locking position. In this way, the first elastic member 260 can drive the first locking member 240 to automatically move from the first locking position to the first locking position, so that the first locking member 240 releases the pressing force on the second locking member 280, and the second elastic member 320 can drive the third locking member 310 to automatically move from the third locking position to the third locking position, and further can drive the second locking member 280 to move from the second locking position to the second locking position, so as to finally limit the relative rotation among the first connecting seat 210, the second connecting seat 220, the third connecting seat 230 and the fourth connecting seat 290, and further maintain the relative fixation. Likewise, the second elastic member 320 may be a compression spring, both ends of which are abutted between the fourth coupling seat 290 and the third locking member 310.

Referring to fig. 1, 2 and 19, in an embodiment, the cart 1000 further includes a seat 170 (see later for specific structure), and the seat 170 is connected to a fourth connecting seat 290. Specifically, when the stroller 1000 is in the extended state, the seat 170 is disposed at a fifth angle α5 (see fig. 3) with respect to the rear wheel frame 130. When the cart 1000 is in the collapsed state, the seat 170 is disposed at a sixth angle (not shown) with respect to the rear wheel frame 130, wherein the sixth angle is less than the fifth angle α5.

The following is a brief description of the operation and principles of the joint structure 200 in connection with the relevant drawings.

Referring to fig. 3 and 19, in the present embodiment, when the cart 1000 is in the extended state, the driving member 250 is in the initial position, the first locking member 240 is in the first locking position, and the first connection seat 210 and the second connection seat 220 remain relatively fixed. In addition, the second locking member 280 is in the second locking position, and the locking portion 281 penetrates the second connecting seat 220 and the third connecting seat 230 to keep the two relatively fixed. In addition, the third locking member 310 is in the third locking position, and the third connecting seat 230 and the fourth connecting seat 290 remain relatively fixed. Accordingly, the cart 1000 can be stably maintained in the extended state by the cooperation of the first, second and third locking members 240, 280 and 310.

When it is desired to switch the cart 1000 from the extended state to the collapsed state (from fig. 3 to fig. 12, 13, and 14 in order), the actuator 250 may be moved gradually to the unlocked position. The driving member 250 directly drives the first locking member 240 to move to the first unlocking position during the moving process, and meanwhile, the driving member 250 can indirectly drive the second locking member 280 to move to the second unlocking position through the first locking member 240, and in addition, the driving member 250 can indirectly drive the third locking member 310 to move to the third unlocking position through the second locking member 280. When the driving member 250 moves to the unlocking position, the first locking member 240 is located at the first unlocking position, the first elastic member 260 is in a compressed state, and the first connecting seat 210 can rotate relative to the second connecting seat 220, so that the handlebar 110 and the front wheel frame 120 are close to each other. Meanwhile, the second locking member 280 is located at the second locking position, and the locking portion 281 is retracted from the second connecting seat 220, so that the second connecting seat 220 can rotate relative to the third connecting seat 230 to make the front wheel frame 120 and the rear wheel frame 130 approach each other. In addition, the third locking member 310 is located at the third locking position, the second elastic member 320 is in a compressed state, and the fourth connecting seat 290 is rotatable relative to the third connecting seat 230, so that the seat 170 and the rear wheel frame 130 are close to each other.

When the cart 1000 is required to be switched from the folded state to the extended state, the seat 170, the rear wheel frame 130, the front wheel frame 120 and the handlebar frame 110 can be rotated to restore the seat 170, the rear wheel frame 130, the front wheel frame 120 and the handlebar frame 110 to the corresponding positions when the cart 1000 is in the extended state, so as to drive the corresponding connection seats to rotate around the first pivot. In this process, the second elastic member 320 gradually resets and pushes the third locking member 310 to move to the third locking position, so that the fourth connecting seat 290 is fixed with respect to the third connecting seat 230. The third locking member 310 pushes the second locking member 280 to move to the second locking position during moving to the third locking position, which is equivalent to pushing the locking portion 281 to penetrate the third connecting seat 230 and the second connecting seat 220 in a direction parallel to the axial direction, thereby limiting the pivoting between the third connecting seat 230 and the second connecting seat 220. In addition, the first elastic member 260 gradually resets and pushes the first locking member 240 to move toward the first locking position, thereby restricting the pivoting between the second connection base 220 and the first connection base 210.

As can be seen from the foregoing description, when the cart 1000 is switched between the folded state and the extended state, the cart handle 110, the front wheel frame 120, the rear wheel frame 130, and the seat 170 connected to the joint structure 200 are rotated along with the corresponding connection seats, so that the cart 1000 can be switched between the extended state and the folded state.

To facilitate user control of the position of the driver 250, referring to fig. 6 and 16, in one embodiment, the driver 250 is coupled to the vehicle frame 110 via a first traction member 270. Specifically, in the present embodiment, the driving member 250 is connected to the fifth connection seat 1131 through the first traction member 270. More specifically, the first traction member 270 may be a traction rope, one end of which is connected to the fifth coupling seat 1131, and the other end of which is connected to the driving member 250. Therefore, when the first pushing frame 111 pivots relative to the second pushing frame 112, the fifth link seat 1131 pivots relative to the sixth link seat 1132, and thus the end of the traction rope connected to the fifth link seat 1131 rotates with it, so as to drive the driving member 250 to rotate around the first pivot.

In order to achieve a conversion of the driving member 250 from a rotational movement to an axial movement, in an embodiment, as shown in fig. 16 and 21, the driving member 250 is provided with an abutment 251, and the abutment 251 protrudes in a direction parallel to the axial direction and extends obliquely in the circumferential direction. The first connecting seat 210 is provided with a pushing portion 214, and the pushing portion 214 protrudes in a direction parallel to the axial direction and extends obliquely along the circumferential direction. Specifically, the pushing portion 214 protrudes from the bottom wall of the first accommodating space 212 in the first connecting seat 210 toward the driving member 250. The abutting portion 251 and the pushing portion 214 abut against each other in a direction parallel to the axial direction. Specifically, when the cart 1000 is in the extended state, the abutting portion 251 and the pushing portion 214 are engaged with each other. When the cart 1000 is switched from the extended state to the folded state, the first pushing frame 111 pivots about the second pivot 1137 relative to the second pushing frame 112 (from fig. 3 to fig. 12), and during this process, the fifth connecting seat 1131 drives one end of the first traction member 270 to rotate about the second pivot 1137, so as to drive the driving member 250 to rotate relative to the first connecting seat 210 along the circumferential direction around the first pivot. When the abutting portion 251 and the pushing portion 214 are pushed against each other, the driving member 250 can move in the axial forward direction, so that the driving member 250 moves from the initial position to the unlock position.

In this embodiment, when the user needs to fold the cart 1000, the user pushes the safety push button 164 to move the safety push button 164 to the fourth position, and then, the user operates the lock release button 161 to drive the fourth locking member 1133 to retract from the lock groove 11321, so that the folding between the first pushing frame 111 and the second pushing frame 112 can be achieved by rotating the first pushing frame 111. In this process, the fifth coupling seat 1131 rotates about the second pivot 1137, thereby driving the first traction member 270 to move, and finally rotating the driving member 250 about the first pivot. Since the driving member 250 is provided with the abutting portion 251, when the driving member 250 rotates, the abutting portion 251 abuts against the pushing portion 214 on the first connecting seat 210, so as to drive the driving member 250 to move along the axial positive direction to switch to the unlocking position. As can be seen from the foregoing description, when the driving member 250 is located at the unlocking position, the first locking member 240 is located at the first unlocking position, the second locking member 280 is located at the second unlocking position, and the third locking member 310 is located at the third unlocking position. At this time, the first connecting seat 210 may rotate relative to the second connecting seat 220, the second connecting seat 220 may rotate relative to the third connecting seat 230, and the third connecting seat 230 may rotate relative to the fourth connecting seat 290, so that the cart 1000 may be switched from the extended state to the folded state.

In an embodiment, the first connection socket 210 is provided with a first limit post 211 (see fig. 21) extending in a direction parallel to the axial direction, the second connection socket 220 is provided with a second limit post 221 (see fig. 16 and 22) extending in a direction parallel to the axial direction, the third connection socket 230 is provided with a third limit post 231 (see fig. 17 and 23) extending in a direction parallel to the axial direction, and the first limit post 211, the third limit post 231, and the second limit post 221 are sequentially arranged in the circumferential direction. When the cart 1000 is in the extended state, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are relatively fixed, and the third limiting post 231 is at least abutted with one of the first limiting post 211 and the second limiting post 221. Specifically, in the present embodiment, as shown in fig. 3, the third limit posts 231 are respectively abutted with the first limit posts 211 and the second limit posts 221. In this way, the third connecting seat 230 can be fixed relative to the second connecting seat 220 and the first connecting seat 210 respectively, that is, the third connecting seat 230 cannot rotate relative to the second connecting seat 220, and at the same time, the third connecting seat 230 cannot rotate relative to the first connecting seat 210. It can be seen that, when the cart 1000 is in the extended state, the second locking member 280 can ensure the relative fixation between the second connecting seat 220 and the third connecting seat 230, and in addition, the second connecting seat 220 can be further stably fixed relative to the third connecting seat 230 by the mutual abutment of the third limiting post 231 and the first limiting post 211 and the second limiting post 221. In this way, stability and reliability of the cart 1000 in the extended state may be improved. As shown in fig. 14, when the cart 1000 is in the folded state, the first limit post 211, the third limit post 231, and the second limit post 221 are sequentially disposed at intervals along the circumferential direction, and at this time, the third connection base 230 may pivot with respect to the first connection base 210 and the second connection base 220.

Specifically, as shown in fig. 16, 17 and 21 to 23, in the present embodiment, the first limiting post 211 is formed protruding toward the second connecting seat 220 in a direction parallel to the axial direction, the second limiting post 221 is formed protruding toward the first connecting seat 210 in a direction parallel to the axial direction, and the third limiting post 231 is formed protruding toward the first connecting seat 210 in a direction parallel to the axial direction and penetrates through the second connecting seat 220. More specifically, the second connecting seat 220 is provided with a movable slot 224 for the third limiting post 231 to move along the circumferential direction, and the movable slot 224 has an arc-shaped structure. The first and third limiting posts 211 and 231 can move in the second connecting seat 220 in the circumferential direction. Specifically, when the cart 1000 is in the folded state, the third limit post 231 abuts against a groove wall of the movable groove 224 on a side away from the second limit post 221 in the circumferential direction (see fig. 14).

It should be noted that the first limiting post 211 is formed protruding toward the second connecting seat 220 and is disposed at an interval from the axial direction, and specifically, the first limiting post 211 is formed protruding from the bottom wall of the first accommodating space 212 in the first connecting seat 210 toward the second connecting seat 220. The second limiting post 221 is formed protruding toward the first connecting seat 210 and is disposed at an interval from the axial direction, and specifically, the second limiting post 221 is formed protruding from the bottom wall of the second accommodating space 222 in the second connecting seat 220 toward the first connecting seat 210. The third limiting post 231 may be formed protruding toward the first connection seat 210, pass through the second connection seat 220, and be disposed at an axial distance from the second connection seat 220, and specifically, the third limiting post 231 may be formed protruding from a surface of the third connection seat 230 facing the second connection seat 220 toward the first connection seat 210. The first limiting post 211, the second limiting post 221 and the third limiting post 231 extend in a direction parallel to the axial direction only in the preferred embodiment.

Referring to fig. 3, 13 and 14, in one embodiment, the first locking member 240 and the driving member 250 are located at radial sides of the first limiting post 211, the second limiting post 221 and the third limiting post 231. Specifically, the first locking member 240 and the driving member 250 are located radially outside the first limiting post 211, the second limiting post 221 and the third limiting post 231, which is regarded as that the first locking member 240 and the driving member 250 are movably sleeved outside the first limiting post 211, the second limiting post 221 and the third limiting post 231. In this way, interference between axial movement or rotation about the axial direction of the first locking member 240 and the driving member 250 and movement of each stopper post in the circumferential direction can be avoided.

In order to enable the cart 1000 to be stably maintained in the folded state after being folded, referring to fig. 21 and 22, in an embodiment, the first connection base 210 is provided with a first engaging member 215, and the second connection base 220 is provided with a second engaging member 225. Specifically, the first engaging member 215 and the second engaging member 225 are located between the first limiting post 211 and the second limiting post 221 along the circumferential direction, and are located at one side of the first limiting post 211 and the second limiting post 221 away from the third limiting post 231 along the circumferential direction. When the cart 1000 is in the folded state, the first engaging member 215 and the second engaging member 225 are engaged with each other, and specifically, the first engaging member 215 abuts against the second engaging member 225 at a side of the second engaging member 225 near the second limiting post 221 (see fig. 14). In this way, the first coupling seat 210 may be rotated with respect to the second coupling seat 220 to be kept fixed, so as to limit the movement of the handle 110 to a side away from the rear wheel frame 130. When the cart 1000 is in the extended state, the first engaging member 215 is located on a side of the second engaging member 225 close to the first limiting post 211, and is spaced apart from the second engaging member 225 (see fig. 3).

Referring to fig. 3, 14, 21 and 22, in an embodiment, the second engaging member 225 is an engaging protrusion, which is formed to protrude toward the first connecting seat 210 in a direction parallel to the axial direction, and is provided with an engaging portion 2255. Specifically, the second engaging member 225 protrudes from the bottom wall of the second accommodating space 222 in the second connecting seat 220 toward the first connecting seat 210. The first engaging member 215 includes an elastic arm 2151 and a convex hull 2153, where the middle portion of the elastic arm 2151 forms a hollowed deformation portion 2152, and the deformation portion 2152 makes the elastic arm 2151 have an elastic force that elastically deforms in a radial direction, and the convex hull 2153 is located radially inside the elastic arm 2151. when the cart 1000 is in the folded state, the elastic arm 2151 is at least partially located at the radial outer side of the second engaging member 225, and the convex hull 2153 abuts against the second engaging member 225 at a side of the second engaging member 225 near the second limiting post 221. Specifically, at least one of the projection 2153 and the snap projection is provided with a guide ramp 2256. Thus, when the cart 1000 is switched from the extended state to the folded state, the first connecting seat 210 rotates circumferentially relative to the second connecting seat 220, and the guiding slope 2256 is used for guiding the first engaging member 215 to move from the side of the second engaging member 225 near the first limiting post 211 to the side of the second engaging member 225 near the second limiting post 221. More specifically, the first connecting seat 210 has a rib 217 protruding toward the second connecting seat 220, and specifically, the rib 217 is formed protruding toward the second connecting seat 220 from the bottom wall of the first accommodating space 212 in the first connecting seat 210. The rib 217 is disposed around the axial direction, that is, the rib 217 is disposed along the circumferential direction, and the first engaging portion 215 is disposed on the inner circumferential surface of the rib 217 and protrudes toward the position where the axial direction is located, that is, the elastic arm 2151 is connected to the inner circumferential surface of the rib 217, and at the same time the first limiting post 211 is also connected to the inner circumferential surface of the rib 217. More specifically, the snap-fit protrusion is generally a cube structure including an inner wall 2251 and an outer wall 2252 arranged in a radial direction, and a first sidewall 2253 and a second sidewall 2254 connected between the inner wall 2251 and the outer wall 2252. Wherein the arcuate transition between the outer wall 2252 and the first sidewall 2253 forms a leading ramp 2256 and the arcuate transition between the outer wall 2252 and the second sidewall 2254 forms a snap 2255. As shown in fig. 3, 13 and 14, when the frame 1000 is switched from the extended state to the folded state, the first connecting seat 210 rotates clockwise about the first pivot, so that the first engaging member 215 gradually approaches the second engaging member 225 and engages with the second engaging member 225. In this process, the projection 2153 gradually abuts against the guide ramp 2256 and moves toward the outer wall 2252, and during the abutment process, the projection 2153 is compressed to deform the resilient arms 2151 inwardly toward the deformations 2152. when the projection 2153 reaches the catch 2255 beyond the outer wall 2252, the resilient arm 2151 resets to drive the projection 2153 into engagement with the catch 2255. Thus, when the cart 1000 is in the folded state, the first connecting seat 210 and the second connecting seat 220 can be kept relatively fixed before the cart is in the folded state without external force or with small external force, so that the cart handle 110 is prevented from being randomly pivoted relative to the front wheel frame 120.

Referring to fig. 3, 13 and 14, when the cart 1000 is shifted from the extended state toward the folded state, the handle frame 110 is first rotated in the direction approaching the front wheel frame 120, so that the first stopper post 211 moves in the positive circumferential direction toward the side away from the third stopper post 231 (i.e., the direction in which the first stopper post 211 moves in the circumferential direction toward the side away from the third stopper post 231 is the positive circumferential direction), at the same time, the handle frame 110 gradually rotates in the direction approaching the rear wheel frame 130, and when the handle frame 110 abuts against the rear wheel frame 130, the rear wheel frame 130 is pushed to move together in the direction approaching the front wheel frame 120, so that the third stopper post 231 moves in the positive circumferential direction toward the side away from the second stopper post 221 toward the groove wall of the movable groove 224 until the convex hull 2153 is engaged with the engaging portion 2255 in the positive circumferential direction, and the third stopper post 231 abuts in the positive circumferential direction toward the groove wall of the movable groove 224 toward the side away from the second stopper post 221, so that the cart 1000 reaches the folded state.

Referring to fig. 3, 13 and 14, when the cart 1000 is shifted from the folded state to the extended state, the handle frame 110 is first rotated in a direction away from the front wheel frame 120, so that the first limit post 211 moves toward the third limit post 231 in a circumferential opposite direction (i.e., the direction in which the first limit post 211 moves toward the third limit post 231 in the circumferential opposite direction) while the convex hull 2153 is disengaged from the engaging portion 2255 in the circumferential opposite direction until the first limit post 211 abuts against the third limit post 231 in the circumferential opposite direction, and the first limit post 211 can push the third limit post 231 in the circumferential opposite direction in the movable slot 224, so that the third limit post 231 can slide in the movable slot 224 toward the slot wall on the side of the second limit post 221 in the circumferential opposite direction until the first locking member 240 is located at the first locking position, so that the relative positional relationship between the first limit post 211 and the second limit post 221 is fixed, and the third limit post 231 can at least abut against the first limit post 211 in the circumferential opposite direction until the cart 1000 reaches the extended state. In the embodiment shown in fig. 3, when the cart 1000 reaches the extended state, the third limit post 231 is also in abutment with the second limit post 221 in the circumferential direction, that is, the third limit post 231 is clamped between the first limit post 211 and the third limit post 231 in the circumferential direction.

Referring to fig. 2, in an embodiment, a first blocking portion 226 is disposed on an outer side of the second connecting seat 220, and a second blocking portion 234 is disposed on an outer side of the third connecting seat 230. When the driving member 250 is in the unlocked position and the first locking member 240 is in the first unlocked position and the rear wheel frame 130 is disposed at a distance from the front wheel frame 120 in the circumferential direction, the first blocking portion 226 and the second blocking portion 234 abut against each other in the circumferential direction so as to maintain the angle between the front wheel frame 120 and the rear wheel frame 130 at the first angle α1. In this way, after the first push handle 1111 is folded down, the front wheel frame 120 and the rear wheel frame 130 can be prevented from pivoting relatively due to no blocking, so that the front wheel frame 120 and the rear wheel frame 130 are unfolded horizontally (i.e. the included angle between the front wheel frame 120 and the rear wheel frame 130 is approximately 180 degrees), and the folding effect is prevented from being affected. At the same time, the first blocking portion 226 and the second blocking portion 234 abut against each other along the circumferential direction, and can also be used for prompting a user that the front wheel frame 120 and the rear wheel frame 130 are already in positions in which the second locking member 280 can be axially inserted into the second connecting seat 220 and the third connecting seat 230. With continued reference to fig. 2, specifically, the first blocking portion 226 is disposed on the outer periphery of the second connecting seat 220, and the first blocking portion 226 extends toward the third connecting seat 230 in a direction parallel to the axial direction and is opposite to the outer portion Zhou Waitu of the second connecting seat 220. The second blocking portion 234 is disposed on the outer periphery of the third connecting seat 230, and the second blocking portion 234 extends toward the second connecting seat 220 along a direction parallel to the axial direction and is opposite to the outer Zhou Waitu of the third connecting seat 230.

With continued reference to fig. 2, in an embodiment, the third connection seat 230 is further provided with a third blocking portion 235 at the outer periphery, and the fourth connection seat 290 is provided with a fourth blocking portion 293 at the outer periphery. The third blocking portion 235 and the fourth blocking portion 293 are abutted with each other in the circumferential direction to indicate to the user that the seat 170 and the rear wheel frame 130 are in a position in which the third locking member 310 is engaged with the third connecting seat 235 and the fourth connecting seat 290 in the axial direction. Specifically, the third blocking portion 235 extends toward the fourth connecting seat 290 and opposite the outer portion Zhou Waitu of the third connecting seat 230 in a direction parallel to the axial direction, and the fourth blocking portion 293 extends toward the third connecting seat 230 and opposite the outer portion Zhou Waitu of the fourth connecting seat 290 in a direction parallel to the axial direction.

Referring again to fig. 2, in one embodiment, the second blocking portion 234 is disposed opposite and connected to the third blocking portion 235 in a direction parallel to the axial direction. Of course, in other embodiments, the second blocking portion 234 and the third blocking portion 235 may be integrally formed, or the second blocking portion 234 and the third blocking portion 235 may be spaced apart from each other, and are not connected. When the front wheel frame 120 and the rear wheel frame 130 are disposed at the first angle α1 and the seat 170 and the rear wheel frame 130 are disposed at the fifth angle α5, the first blocking portion 226 and the fourth blocking portion 293 are disposed opposite to each other in a direction parallel to the axial direction.

Referring to fig. 18 and 24, in an embodiment, the seat 170 includes a seat plate 171, a folding back strap 172 penetrating the seat plate 171, and a winding mechanism 173 connected to two ends of the folding back strap 172. The two ends of the folding back strap 172 respectively pass through the seat plate 171 to extend from the first surface to the second surface of the seat plate 171, and are connected to a winding mechanism 173 arranged on the second surface, the winding mechanism 173 automatically tightens the folding back strap 172, and the first surface and the second surface are opposite to each other. In this embodiment, the first surface is a surface for supporting buttocks of the child. When the cart 1000 is in the extended state, the second surface faces the ground, and the winding mechanism 173 is disposed on the second surface, so that the winding mechanism 173 can be prevented from occupying the riding space of the child. When the cart 1000 is in a folded state and the user needs to transfer the cart 1000 in a back-holding manner, the user can directly pull the folding back strap 172, so that the folding back strap 172 can automatically extend from the winding mechanism 173, and the extending folding back strap 172 can be held or carried by the user. When the cart 1000 is not required to be transferred, the user can be regarded as not using the folding back strap 172, and the winding mechanism 173 can automatically tighten the folding back strap 172, namely, the folding back strap 172 can be automatically wound, so that the excessive folding back strap 172 is prevented from leaking out of the seat plate 171 to affect the riding comfort of the child.

In particular, referring to fig. 25 and 26, the take-up mechanism 173 includes a spool 1731 and a coil spring 1732. Wherein, one end of the coil spring 1732 is fixedly connected to the second surface, and the coil disc 1731 is sleeved outside the coil spring 1732 and connected to the other end of the coil spring 1732. Thus, the reel 1731 can rotate as the coil spring 1732 is wound up. Specifically, two ends of the folding back strap 172 pass through the seat plate 171 and are respectively connected with the reel 1731, and the connection parts of the two ends of the folding back strap 172 and the reel 1731 are oppositely arranged along the circumferential direction of the reel 1731. More specifically, in the present embodiment, two openings 17311 are provided in the circumferential direction of the reel 1731, and the ends of the folding straps 172 respectively pass through the two openings 17311 to form a knot 1721 (e.g. a spherical knot or a bow-tie, etc.), so that the knot 1721 can be clamped with the edge of the opening 17311, so that the folding straps 172 are connected to the reel 1731.

Referring to fig. 24 and 25, in an embodiment, the winding mechanism 173 further includes a shielding cover 1733, where the shielding cover 1733 is substantially circular and is mainly used to cover the reel 1731 and the coil spring 1732, so as to prevent the structures such as the reel 1731 and the coil spring 1732 from leaking. Thus, not only can the aesthetic appearance of the cart 1000 be improved, but also the user or child can be prevented from erroneously touching the reel 1731, the coil spring 1732, and the like. Of course, in other embodiments, the shielding cover 1733 may have other shapes, as shown in fig. 27 and 28, where the shielding cover 1733 includes a main cover 17331 and an auxiliary cover 17332, the main cover 17331 is generally circular, an inner cavity of the main cover 17331 is used for accommodating the reel 1731 and the coil spring 1732, the auxiliary cover 17332 is generally strip-shaped, and an inner cavity of the auxiliary cover 17332 is used for accommodating a portion of the folding back strap 172 exposed on the second surface, that is, a portion of the auxiliary cover 17332 used for covering the folding back strap 172 disposed on the second surface, the auxiliary cover 17332 is connected with the main cover 17331, and the inner cavity of the auxiliary cover 17332 is communicated with the inner cavity of the main cover 17331. In the present embodiment, the auxiliary cover 17332 is disposed to extend substantially along the extending direction of the folding back strap 172 on the second surface.

Referring to fig. 28, in an embodiment, the winding mechanism 173 further includes a guide wheel 1734 and a steering wheel 1735, both rotatably disposed on the second surface of the seat plate 171. The operation of guide wheel 1734 and steering wheel 1735 will be briefly described below using one end of folding back strap 172 as an example. Specifically, the axis of rotation of the guide wheels 1734 is generally parallel to the second surface of the seat plate 171 and the axis of rotation of the steering wheels 1735 is generally perpendicular to the second surface of the seat plate 171, both of which are located in the retracting path of the retracting straps 172. The rotation axis of the steering wheel 1735 is parallel to the rotation axes of the reel 1731 and the coil spring 1732. One end of the folding back strap 172 passes through the seat plate 171 and then passes through the gap between the guide wheel 1734 and the second surface, so that friction on the folding back strap 172 can be reduced, the folding back strap 172 is convenient for moving and guiding, and then enters the opening 17311 of the reel 1731 around the steering wheel 1735 to be connected with the reel 1731. Because the rotation axes of the guide wheel 1734 and the steering wheel 1735 are perpendicular, the folding back strap 172 gradually switches from a state parallel to the second surface to a state perpendicular to the second surface in the process of moving from the guide wheel 1734 to the steering wheel 1735, and after one end of the folding back strap 172 passes through the steering wheel 1735, the folding back strap 172 can be tangent to the steering of the reel 1731, so that the folding back strap is convenient to be folded.

With continued reference to fig. 28, in an embodiment, the winding mechanism 173 further includes at least one set of guide ribs 1736, and the set of guide ribs 1736 includes two guide ribs 1736 disposed in opposition with the winding strap 172 passing between the two guide ribs 1736. Specifically, a set of guide ribs 1736 are disposed between the guide wheels 1734 and the steering wheels 1735, and the set of guide ribs 1736 are used to assist in folding the back strap 172 from a state parallel to the second surface to a state perpendicular to the second surface. In addition, a set of guide ribs 1736 are also provided between the steering wheel 1735 and the reel 1731, and the set of guide ribs 1736 are used to assist in winding the harness 172 onto the reel 1731.

Referring to fig. 29, the second embodiment of the present invention provides a joint structure 200, and the joint structure 200 can be regarded as a modification of the joint structure 200 of the first embodiment, except that the second locking member 280, the third locking member 310 and the second elastic member 320 are omitted, and the third connecting seat 230 and the fourth connecting seat 290 are connected to form one unit (which may be referred to as a rotating seat 330). In the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein. In this way, the articulation structure 200 can still be unfolded and folded, and thus the cart 1000 employing the articulation structure 200 can also be switched between an extended state and a folded state. In the cart 1000 using the joint structure 200 according to the second embodiment, the handlebar frame 110 is connected to the first connecting seat 210, the front wheel frame 120 is connected to the second connecting seat 120, the rear wheel frame 130 is connected to the rotating seat 330, the seat 170 is pivoted to both the front wheel frame 120 and the rear wheel frame 130, and when the rear wheel frame 130 is closed to the front wheel frame 120, the seat 170 is driven to pivot to both the front wheel frame 120 and the rear wheel frame 130 to fold.

The third embodiment of the present invention provides a joint structure 200 (not shown in the drawings), and the joint structure 200 can be considered as a modification of the joint structure 200 in the first embodiment, and the difference is mainly that the first limiting post 211, the second limiting post 221 and the third limiting post 231 are omitted. The relative fixation and pivoting between the second and third connection seats 220 and 230 is achieved only by the second locking member 280. Therefore, in the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein.

The fourth embodiment of the present invention provides a joint structure 200 (not shown in the drawings), and the joint structure 200 can be regarded as a modification of the joint structure 200 in the first embodiment, mainly in that the third locking member 310 is omitted, the third connecting seat 230 and the fourth connecting seat 290 are connected to form a unit (which may be referred to as a rotating seat 330), the second locking member 280 is movably disposed in the rotating seat 330, and the second elastic member 320 is abutted between the inner wall of the rotating seat 330 and the second locking member 280, so that the locking portion 281 of the second locking member 280 constantly has a tendency to pass through the rotating seat 330 to be inserted into the second connecting seat 220. Therefore, in the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein. In the cart 1000 using the joint structure 200 according to the fourth embodiment, the handlebar frame 110 is connected to the first connection base 210, the front wheel frame 120 is connected to the second connection base 220, the rear wheel frame 130 is connected to the rotating base 330, the seat 170 is simultaneously pivoted to the front wheel frame 120 and the rear wheel frame 130, and when the rear wheel frame 130 is closed relative to the front wheel frame 120, the seat 170 is driven to simultaneously pivot relative to the front wheel frame 120 and the rear wheel frame 130 to fold.

The fifth embodiment of the present invention provides a joint structure 200 (not shown in the drawings), and the joint structure 200 can be considered as a modification of the joint structure 200 in the first embodiment, wherein the difference is that when the second locking member 280 is in the second locking position, the second locking member 280 passes through the third connecting seat 230, the second connecting seat 220, and the first locking member 240 in sequence, and then directly abuts against the driving member 250. Thus, when the driving member 250 moves from the initial position to the unlocked position, the driving member 250 can directly drive the first locking member 240 from the first locking position to the first unlocking position, and can also directly drive the second locking member 280 from the second locking position to the second unlocking position.

Referring to fig. 30, a sixth embodiment of the present invention provides a joint structure 200, where the joint structure 200 can be considered as a modification of the joint structure 200 in the first embodiment, and the difference is that the driving member 250 is located between the first locking member 240 and the second connecting seat 220, the second locking member 280 is located between the driving member 250 and the first locking member 240, the locking portion 281 of the second locking member 280 is disposed at a distance from the abutting portion 251 of the driving member 250 in the radial direction, and the locking portion 281 protrudes toward the second connecting seat 220 in the direction parallel to the axial direction, and the first elastic member 260 abuts between the first locking member 240 and the first connecting seat 210. In the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein. The differences between the present embodiment and the first embodiment described above will be mainly described below.

Specifically, in the present embodiment, when the driving member 250 is at the initial position, the driving member 250 is located in the second connecting seat 220, the first locking member 240 is at the first locking position, the first locking member 240 is simultaneously engaged with the first connecting seat 210 and the second connecting seat 220, the second locking member 280 is at the second locking position, and the locking portion 281 passes over the periphery of the driving member 250, sequentially passes through the second connecting seat 220 and the third connecting seat 230, and abuts against the third locking member 310, so that the third locking member 310 is at the third locking position, i.e. the third locking member 310 is simultaneously engaged with the third connecting seat 230 and the fourth connecting seat 290.

When the driving member 250 moves from the initial position to the unlocked position, the driving member 250 can drive the second locking member 280 and the first locking member 240 to move in the opposite axial direction, so that the locking portion 281 of the second locking member 280 is disengaged from the third connecting seat 230, and the first locking member 240 is moved into the first connecting seat 210 to reach the first unlocking position. The locking portion 281 is gradually not abutted against the third locking member 310 during moving along the direction parallel to the opposite axial direction, and under the restoring action of the second elastic member 320, the second elastic member 320 can drive the third locking member 310 to move into the third connecting seat 230 so as to reach the third locking position. It should be noted that, in the present embodiment, the first unlocking position of the first locking member 240 is located in the first connecting seat 210, the third unlocking position of the third locking member 310 is located in the third connecting seat 230, and the first traction member 270 is inserted into the front wheel frame 120 through the second connecting seat 220.

When the driving member 250 moves from the unlock position to the initial position, the second locking member 280 and the first locking member 240 are no longer abutted by the driving member 250, and a moving gap is left between the driving member 250 and the second locking member 280, so that under the action of the first elastic member 260, the first locking member 240 is pushed to return to the first locking position to keep the first connection seat 210 and the second connection seat 220 fixed, and meanwhile, the second locking member 280 is pushed to return to the second locking position to keep the second connection seat 220 and the third connection seat 230 fixed. When the second locking member 280 is at the second locking position, the locking portion 281 passes over the periphery of the driving member 250, sequentially passes through the second connecting seat 220 and the third connecting seat 230, and pushes the third locking member 310, so that the third locking member 310 is at the third locking position, and finally the third connecting seat 230 and the fourth connecting seat 290 remain fixed.

Referring to fig. 31, a seventh embodiment of the present invention provides a joint structure 200, and the joint structure 200 can be regarded as a modification of the joint structure 200 of the sixth embodiment described above, with the difference that the third locking member 310 and the second elastic member 320 are omitted, and the third connecting seat 230 and the fourth connecting seat 290 are connected to form one unit (which may be referred to as a rotating seat 330). Similarly, when the driving member 250 is at the initial position, the first locking member 240 is at the first locking position, the first locking member 240 is simultaneously engaged with the first connecting seat 210 and the second connecting seat 220, and the second locking member 280 is at the second locking position, and the locking portion 281 sequentially passes over the periphery of the driving member 250 and through the second connecting seat 220 to enter the rotating seat 330. In the case of no conflict, the working principles of each component in the joint structure 200 can be referred to the working principles of each corresponding component in the joint structure 200 of the first embodiment and the sixth embodiment, which are not described herein. In this way, the articulation structure 200 can still be unfolded and folded, and thus the cart 1000 employing the articulation structure 200 can also be switched between an extended state and a folded state. In the cart 1000 using the joint structure 200 according to the seventh embodiment, the handlebar frame 110 is connected to the first connecting seat 210, the front wheel frame 120 is connected to the second connecting seat 120, the rear wheel frame 130 is connected to the rotating seat 330, the seat 170 is pivoted to both the front wheel frame 120 and the rear wheel frame 130, and when the rear wheel frame 130 is closed to the front wheel frame 120, the seat 170 is driven to pivot to both the front wheel frame 120 and the rear wheel frame 130 to fold.

Referring to fig. 32, an eighth embodiment of the present invention provides a joint structure 200, and the joint structure 200 can be regarded as a modification of the joint structure 200 of the first embodiment, with the main difference that the third locking member 310 is omitted, and the third connecting seat 230 and the fourth connecting seat 290 are connected to form one part (which may be referred to as a rotating seat 330). In addition, the driving member 250 is located between the first locking member 240 and the second connection seat 220, the second locking member 280 is located between the driving member 250 and the second connection seat 220, the locking portion 281 of the second locking member 280 protrudes toward the second connection seat 220 in a direction parallel to the axial direction, and the second elastic member 320 (not shown in fig. 32) is located on the rotation seat 330 for abutting against the locking portion 281, so that the locking portion 281 constantly has a tendency to withdraw from the rotation seat 330, and the first elastic member 260 abuts between the first connection seat 210 and the first locking member 240. Therefore, in the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein. The differences between the present embodiment and the first embodiment described above will be mainly described below.

Specifically, in the present embodiment, when the driving member 250 is at the initial position, the driving member 250 is located in the second connecting seat 220, the first locking member 240 is at the first locking position, the first locking member 240 is simultaneously engaged with the first connecting seat 210 and the second connecting seat 220, the second locking member 280 is at the second locking position, and the locking portion 281 sequentially passes through the second connecting seat 220 and enters the rotating seat 330 to abut against the second elastic member 320 in the rotating seat 330.

When the driving member 250 moves from the initial position to the unlocked position, the driving member 250 can drive the first locking member 240 to move in the opposite axial direction, so that the first locking member 240 moves into the first connecting seat 210 to reach the first unlocking position. Since the driving member 250 gradually does not abut against the second locking member 280 any more during the movement of the driving member 250 in the opposite axial direction, and a moving gap is left between the driving member 250 and the second locking member 280, the second elastic member 320 can drive the locking portion 281 of the second locking member 280 to withdraw from the rotating seat 330 under the restoring action of the second elastic member 320. It should be noted that, in the present embodiment, the first locking position is located in the first connecting seat 210, and the first traction member 270 is inserted into the front wheel frame 120 through the second connecting seat 220.

When the driving member 250 moves from the unlocking position to the initial position, the driving member 250 pushes the second locking member 280 to move to the second locking position in the positive axial direction, and the locking portion 281 passes through the second connecting seat 220 and enters the rotating seat 330 to abut against the second elastic member 320, so that the second connecting seat 220 and the rotating seat 330 remain relatively fixed. In addition, after the driving member 250 moves to the initial position, the first locking member 240 is no longer pressed by the driving member 250, and due to the clearance between the driving member 250 and the first locking member 240, the first locking member 240 is driven to move to the first locking position under the restoring force of the first elastic member 260, so that the first connection seat 210 and the second connection seat 220 are kept relatively fixed.

In the cart 1000 using the joint structure 200 according to the eighth embodiment, the handlebar frame 110 is connected to the first connecting seat 210, the front wheel frame 120 is connected to the second connecting seat 120, the rear wheel frame 130 is connected to the rotating seat 330, the seat 170 is pivoted to both the front wheel frame 120 and the rear wheel frame 130, and when the rear wheel frame 130 is closed to the front wheel frame 120, the seat 170 is driven to pivot to both the front wheel frame 120 and the rear wheel frame 130 to fold.

Referring to fig. 33, a ninth embodiment of the present invention provides a joint structure 200, and the joint structure 200 can be regarded as a modification of the joint structure 200 in the eighth embodiment described above, with the main difference being that the position of the second elastic member 320 is changed. In the present embodiment, the second elastic member 320 is located between the second locking member 280 and the second connection seat 220. Therefore, in the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the eighth embodiment, which is not described herein.

Referring to fig. 34, a tenth embodiment of the present invention provides a joint structure 200, which joint structure 200 can also be regarded as a modification of the joint structure 200 in the first embodiment, and is mainly distinguished in that a driving member 250 is located between a first locking member 240 and a second connecting seat 220, a second locking member 280 is located between the driving member 250 and the second connecting seat 220, a locking portion 281 of the second locking member 280 protrudes toward the second connecting seat 220 in a direction parallel to an axial direction, and further, a fifth elastic member 340 is provided between the second connecting seat 220 and the second locking member 280, the fifth elastic member 340 is used for providing an elastic restoring force to the second locking member 280 to maintain the second locking member 280 in the first unlocking position, and the first elastic member 260 is abutted between the first locking member 240 and the first connecting seat 210. In the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the joint structure 200 of the first embodiment, which is not described herein. The differences between the present embodiment and the first embodiment described above will be mainly described below.

Specifically, in the present embodiment, when the driving member 250 is at the initial position, the driving member 250 is located in the second connecting seat 220, the first locking member 240 is at the first locking position, the first locking member 240 is simultaneously engaged with the first connecting seat 210 and the second connecting seat 220, the second locking member 280 is at the second locking position, and the locking portion 281 sequentially passes through the second connecting seat 220 and the third connecting seat 230 and abuts against the third locking member 310, so that the third locking member 310 is at the third locking position, even if the third locking member 310 is simultaneously engaged with the third connecting seat 230 and the fourth connecting seat 290.

When the driving member 250 moves from the initial position to the unlocked position, the driving member 250 can drive the first locking member 240 to move in the opposite axial direction, so that the first locking member 240 moves into the first connecting seat 210 to reach the first unlocking position. During the movement of the driving member 250 in the opposite axial direction, the driving member is gradually no longer abutted against the second locking member 280, and the second locking member 280 can be driven to move to the second locking position under the reset action of the fifth elastic member 340, so as to retract from the third connecting seat 230. When the locking portion 281 of the second locking member 280 moves in a direction parallel to the opposite axial direction, the third locking member 310 is no longer abutted by the locking portion 281, and the third locking member 310 can be moved to the third unlocking position by the second elastic member 320. It should be noted that, in the present embodiment, the first unlocking position of the first locking member 240 is located in the first connecting seat 210, the third unlocking position of the third locking member 310 is located in the third connecting seat 230, and the first traction member 270 is inserted into the front wheel frame 120 through the second connecting seat 220.

When the driving member 250 moves from the unlocking position to the initial position, the driving member 250 pushes the second locking member 280 to move to the second locking position in the positive axial direction, and the locking portion 281 passes through the second connecting seat 220 and the third connecting seat 230 and abuts against the third locking member 310, so that the fourth connecting seat 290 and the third connecting seat 230 are kept relatively fixed, and the third connecting seat 230 and the second connecting seat 220 are kept relatively fixed. In addition, after the driving member 250 moves to the initial position, the first locking member 240 is no longer pressed by the driving member 250, and due to the clearance between the driving member 250 and the first locking member 240, the first locking member 240 is driven to move to the first locking position under the restoring force of the first elastic member 260, so that the first connection seat 210 and the second connection seat 220 are kept relatively fixed.

Referring to fig. 35 to 41, an eleventh embodiment of the present application provides a joint structure 200, the joint structure 200 can also be regarded as a modification of the joint structure 200 in the first embodiment, with the difference that:

The first connecting seat 210 is provided with a first pushing portion 216, the first pushing portion 216 is circumferentially spaced from the first limiting post 211, and the first pushing portion 216 can be elastically deformed in a radial direction.

Referring to fig. 38, when the cart 1000 is in the folded state, the first abutting portion 216 is located between the first limit post 211 and the third limit post 231 in the circumferential direction, the third limit post 231 is located between the first abutting portion 216 and the second limit post 221, and the first abutting portion 216 is configured to abut against the third limit post 231 in a direction approaching the second limit post 221.

Referring to fig. 40, when the cart 1000 is in the extended state, the third limit post 231 is located between the first limit post 211 and the first pushing portion 216 in the circumferential direction, that is, the first pushing portion 216 and the first limit post 211 are located at two sides of the third limit post 231 in the circumferential direction, and the first pushing portion 216 and the third limit post 231 are disposed at intervals in the circumferential direction. It can be seen that the third limiting post 231 is located between the first limiting post 211 and the first pushing portion 216, and also located between the first limiting post 211 and the second limiting post 221. As shown in fig. 40, when the cart 1000 is in the extended state, a portion of the first pushing portion 216 is also disposed opposite to the second stopper post 221 in a direction parallel to the axial direction.

Referring to fig. 38 and 40, in the process of switching the cart 1000 from the folded state to the extended state, the first pushing portion 216 is firstly pushed against the third limiting post 231 in the opposite direction along the circumferential direction compared with the first limiting post 211, and pushes the third limiting post 231 to slide towards the slot wall of the movable slot 224 on the side close to the second limiting post 221, so that the rear wheel frame 130 can be driven to rotate towards the side far from the front wheel frame 120 along the circumferential direction soon after the rotation of the handlebar frame 110. When the third limit post 231 is abutted to the groove wall of the movable groove 224 near one side of the second limit post 221, the included angle between the rear wheel frame 130 and the front wheel frame 120 is the first included angle α1, at this time, the rear wheel frame 130, the front wheel frame 120 and the supporting surface (such as the ground) form a triangle stable structure, and the third limit post 231 cannot move relative to the second limit post 221. However, the first pushing portion 216 may still move in the opposite direction along the circumferential direction with respect to the third limiting post 231, and during this period, due to being blocked by the third limiting post 231, the first pushing portion 216 may elastically deform in the radial direction and be able to move to the radially outer side of the third limiting post 231 in the opposite direction along the circumferential direction. Then, the first pushing portion 216 continues to move until passing over the third limit post 231, reaching a side of the third limit post 231 that is away from the first limit post 211 in the circumferential direction. At this time, the first pushing portion 216 is restored to a shape when not in contact with the third stopper post 231 in the radial direction. In this process, the first limiting post 211 moves in the opposite direction of the circumferential direction toward the direction approaching the third limiting post 231 until abutting against the third limiting post 231, and thus, the cart 1000 completes the conversion and is in the extended state.

As can be seen, in the present embodiment, the third limit post 231 is not required to slide towards the slot wall of the movable slot 224 on the side close to the second limit post 221 by the first limit post 211 as in the first embodiment, so that the rear wheel frame 130 and the front wheel frame 120 are opened relatively, the unfolding speed of the cart 1000 is increased, and the switching speed is increased.

Referring to fig. 36, 38 and 40, the first pushing portion 216 is provided with an elastic arm, and the extending direction of the elastic arm intersects with the circumferential direction, specifically, compared with the first embodiment, the rib portion 217 in the present embodiment is provided in a discontinuous manner along the circumferential direction, that is, the rib portion 217 is intermittently distributed along the circumferential direction, the rib portion 217 is formed with a notch, the first pushing portion 216 is located at the notch, one end of the first pushing portion 216 is connected with an edge of one side of the notch in the circumferential direction, the other end of the first pushing portion 216 is disconnected with an edge of the other side of the notch in the circumferential direction, and extends inward toward the formed area surrounded by the rib portion 217 for pushing the third limiting post 231. When the cart 1000 is converted from the folded state to the extended state, the first pushing portion 216 may be deformed radially toward the corresponding notch so as to move radially outward of the third limiting post 231.

Referring to fig. 38 and 39, an abutment surface 2311 is disposed on a side of the third limit post 231 adjacent to the first limit post 211, and the abutment surface 2311 is located on a path along which the first abutment portion 216 moves in a circumferential direction, so that the first abutment portion 216 can effectively abut against a side of the third limit post 231 adjacent to the first limit post 211 when moving in the circumferential direction relative to the third limit post 231, so as to push the third limit post 231 to move in the circumferential direction. When the first pushing portion 216 is abutted against the abutment surface 2311, an angle between the extending direction of the abutment surface 2311 and the extending direction of the first pushing portion 216 is between 65 ° and 75 °, so that the first pushing portion 216 is not easy to move to the radial outer side of the third limiting post 231 when pushing the third limiting post 231 in the opposite circumferential direction.

In the direction parallel to the axial direction, the second limiting post 221 is located at one side of the circumferential movement track of the first pushing portion 216, so that the first pushing portion 216 cannot abut against the second limiting post 221 when moving along the circumferential direction, and any angle of pivoting can be realized relative to the second limiting post 221. Referring to fig. 40, when the cart 1000 is in the extended state, the first pushing portion 216 may also be completely staggered from the second limiting post 221 in the direction parallel to the axial direction, that is, the first pushing portion 216 may be completely located on a side of the second limiting post 221 away from the third limiting post 231, instead of a portion of the first pushing portion 216 being disposed opposite to the second limiting post 221 in the direction parallel to the axial direction at the same time, as shown in fig. 40. Specifically, the first pushing portion 216 protrudes from the bottom wall of the first accommodating space 212 in the first connecting seat 210 toward the second connecting seat 220 along the direction parallel to the axial direction, and the length of the first pushing portion 216 extending in the direction parallel to the axial direction, that is, the length of the first pushing portion 216 extending toward the second connecting seat 220, is smaller than or equal to the distance between the second limiting post 221 and the first connecting seat 210 along the direction parallel to the axial direction, which is understood to be that the plane where the end face of the first pushing portion 216 facing the second connecting seat 220 is located and the plane where the end face of the second limiting post 221 facing the first connecting seat 210 is located are arranged at intervals or just flush with each other along the direction parallel to the axial direction. Then, during the process of switching the cart 1000 from the folded state to the extended state, the second limiting post 221 does not block the first pushing portion 216 from rotating in the circumferential direction.

Referring to fig. 35 and 36, in the joint structure 200 provided in the present embodiment, the first engaging member 215 is not provided on the first connecting seat 210, and the second engaging member 225 is not provided on the second connecting seat 220. However, in other embodiments, the first connector 210 of the eleventh embodiment may also be provided with the first engaging member 215, and the second connector 220 may also be provided with the second engaging member 225.

Referring to fig. 35, 36 and 38, the first connection seat 210 is further provided with a fourth limit post 218, the fourth limit post 218 extends toward the second connection seat 220 along a direction parallel to the axial direction and is circumferentially spaced apart from the first limit post 211, and the second limit post 221 is located at one side of the fourth limit post 218 along the circumferential movement track in the direction parallel to the axial direction, so that the fourth limit post 218 does not circumferentially abut against the second limit post 221, and any angle of pivoting can be realized relative to the second limit post 221. In the present embodiment, the first limiting post 211 and the fourth limiting post 218 are disposed radially opposite each other.

It should be noted that, the fourth limiting post 218 extends toward the second connecting seat 220 and is spaced from the axial direction, and the fourth limiting post 218 extends along a direction parallel to the axial direction as a preferred embodiment. Specifically, the fourth limiting post 218 is also formed to protrude from the bottom wall of the first accommodating space 212 in the first connecting seat 210 toward the second connecting seat 220.

Specifically, the length of the fourth limiting post 218 extending in the direction parallel to the axial direction, that is, the length of the fourth limiting post 218 extending toward the second connecting seat 220, is smaller than or equal to the distance between the second limiting post 221 and the first connecting seat 210 in the direction parallel to the axial direction, which is understood that the plane of the end face of the fourth limiting post 218 facing the second connecting seat 220 and the plane of the end face of the second limiting post 221 facing the first connecting seat 210 are disposed at intervals or just flush with each other along the direction parallel to the axial direction. The second stop post 221 does not hinder the fourth stop post 218 from rotating circumferentially during the transition of the cart 1000 between the collapsed and extended positions.

Referring to fig. 40, when the cart 1000 is in the extended state, the third limit post 231 is circumferentially located between the first limit post 211 and the fourth limit post 218, and the third limit post 231 is also circumferentially located between the first limit post 211 and the second limit post 221, and the fourth limit post 218 is configured to push the third limit post 231 in a positive circumferential direction so as to move the third limit post 231 in a direction away from the second limit post 221. In the illustrated embodiment, the fourth limiting post 218 is disposed far from the third limiting post 231 compared to the second limiting post 221, and the fourth limiting post 218 is completely staggered from the second limiting post 221 in the direction parallel to the axial direction, that is, the fourth limiting post 218 and the first limiting post 211 are respectively located at two sides of the second limiting post 221 in the circumferential direction, so when the fourth limiting post 218 moves along the positive circumferential direction, the third limiting post 231 can be pushed in the direction far from the second limiting post 221 by passing over the second limiting post 221.

Referring to fig. 38, when the stroller 1000 is in the folded state, the third limit post 231 remains circumferentially between the first limit post 211 and the fourth limit post 218, and the third limit post 231 remains circumferentially between the first limit post 211 and the second limit post 221, but at this time the fourth limit post 218 is disposed closer to the third limit post 231 than the second limit post 221. In the illustrated embodiment, the fourth stop post 218 remains fully offset from the second stop post 221 in a direction parallel to the axial direction.

Referring to fig. 38 and 40, in the process of switching the cart 1000 from the extended state to the folded state, the fourth limit post 218 moves toward the third limit post 231 along the circumferential positive direction, and when the fourth limit post 218 moves to a position opposite to the second limit post 221 along the direction parallel to the axial direction, the fourth limit post 218 and the second limit post 221 simultaneously abut against one side of the third limit post 231 away from the first limit post 211 in the circumferential direction. When the fourth limiting post 218 continues to move along the positive circumferential direction, the fourth limiting post 218 pushes the third limiting post 231 to move along the positive circumferential direction in the movable slot 224 toward the slot wall at the side away from the second limiting post 221 until the third limiting post 231 abuts against the slot wall at the side of the movable slot 224 away from the second limiting post 221 along the positive circumferential direction. At this time, the third limit post 231 is clamped between the fourth limit post 218 and the groove wall of the movable groove 224 on the side far away from the second limit post 221 in the circumferential direction, and thus the cart 1000 is converted and is in a folded state.

In the present embodiment, the third limit post 231 is located between the first limit post 211 and the fourth limit post 218 in the circumferential direction, regardless of whether the cart 1000 is in the extended state or the folded state.

Compared with the first embodiment, in the illustrated embodiment, in addition to the manner that the handle frame 110 pushes the rear wheel frame 130 to move toward the front wheel frame 120, the third limit post 231 is moved toward the slot wall of the movable slot 224 away from the second limit post 221, and the third limit post 231 is moved toward the slot wall of the movable slot 224 away from the second limit post 221 by pushing the fourth limit post 218.

As shown in fig. 36, 38 and 40, the first pushing portion 216 is also located between the first limiting post 211 and the fourth limiting post 218 in the circumferential direction. And the distance between the first pushing portion 216 and the fourth limiting post 218 in the circumferential direction is greater than or equal to the maximum width of the third limiting post 231 in the circumferential direction.

When the cart 1000 is in the extended state, referring to fig. 40, both the first abutment portion 216 and the third limit post 231 are located between the first limit post 211 and the fourth limit post 218 in the circumferential direction, and the third limit post 231 is located between the first limit post 211 and the first abutment portion 216 in the circumferential direction, and the fourth limit post 218 is located farther from the third limit post 231 than the first abutment portion 216 in the circumferential direction.

In the process of switching the cart 1000 from the extended state to the folded state, when the first pushing portion 216 moves along the circumferential positive direction, the first pushing portion 216 moves to the radially outer side of the third limiting post 231 after passing over the second limiting post 221 to contact the third limiting post 231 compared to the fourth limiting post 218. Subsequently, the first pushing portion 216 continues to move to a side of the third limit post 231, which is circumferentially adjacent to the first limit post 211, and returns to its elastic deformation at this position. At the same time, the fourth stopper post 218 moves to a position opposite to the second stopper post 221 in a direction parallel to the axial direction in the forward direction in the circumferential direction, and at this time, the fourth stopper post 218 and the first pushing portion 216 are located on both sides of the third stopper post 231 in the circumferential direction, respectively. Specifically, one end of the first abutment portion 216, which is not connected to the rib portion 217, and the fourth limiting post 218 are located on both sides of the third limiting post 231 in the circumferential direction, that is, the third limiting post 231 is located between the first abutment portion 216 and the fourth limiting post 218 in the circumferential direction. When the fourth limiting post 218 moves along the positive direction of the circumferential direction relative to the second limiting post 221, it pushes the third limiting post 231 to move to the slot wall of the movable slot 224 away from the side of the second limiting post 221, so that the cart 1000 is converted and reaches the folded state.

Referring to fig. 39 and 40, a side of the third limit post 231 near the second limit post 221 is provided with a pressing surface 2312, the pressing surface 2312 is located on a track of the first pushing portion 216 moving along the circumferential positive direction, so that the first pushing portion 216 can effectively contact the pressing surface 2312 along the circumferential positive direction, and when the first pushing portion 216 contacts the pressing surface 2312, an extending direction of the pressing surface 2312 is substantially parallel to an extending direction of the first pushing portion 216, for example, an included angle between the two is between 0 ° and 25 °, so that no excessive resistance is generated when the first pushing portion 216 contacts the third limit post 231 along the circumferential positive direction, so as to smoothly move to the radially outer side of the third limit post 231 along the circumferential positive direction.

Since the second limiting post 221 is located at one side of the fourth limiting post 218 along the circumferential movement track and at one side of the first pushing portion 216 along the circumferential movement track in the direction parallel to the axial direction, in the process of switching the cart 1000 from the folded state to the extended state, both the fourth limiting post 218 and the first pushing portion 216 can pass over the second limiting post 221 when moving in the opposite direction along the circumferential direction, so that the third limiting post 231 can abut against the second limiting post 221 in the opposite direction along the circumferential direction, that is, the third limiting post 231 can smoothly abut against the second limiting post 221 under the pushing of the first pushing portion 216 in the opposite direction along the circumferential direction, and the movement is not stopped in advance due to the abutting of the fourth limiting post 218 and the second limiting post 221 in the opposite direction along the circumferential direction, and meanwhile, the first limiting post 211 can also smoothly move in the opposite direction along the circumferential direction until abutting against the third limiting post 231, so that the situation that the movement of the first limiting post 216 and the second limiting post 221 in the opposite direction along the circumferential direction is stopped in advance is not caused.

Referring to fig. 35 and 41, the cart 1000 is additionally provided with a third traction member 180. One end of the third traction member 180 is connected to the first push frame 111, and the other end is connected to the seat 170. Preferably, the third traction member 180 is a fabric belt. When the first push frame 111 is unfolded with respect to the second push frame 112, the seat 170 is rotated clockwise, i.e., pivoted toward a side away from the rear wheel frame 130 in the circumferential direction, under the traction of the third traction member 180.

Referring to fig. 35, 37 and 41, the fourth connecting seat 290 in the present embodiment is added with a second pushing portion 294, the second pushing portion 294 is disposed on a side of the fourth connecting seat 290 facing the third connecting seat 230, and the second pushing portion 294 is columnar and extends into the third connecting seat 230 along a direction parallel to the axial direction. The second connecting seat 220 is also provided with a third pushing portion 227, the third pushing portion 227 is disposed on one side of the second connecting seat 220 away from the first connecting seat 210 and extends into the third connecting seat 230 along a direction parallel to the axial direction, the second pushing portion 294 and the third pushing portion 227 are disposed opposite to each other in the circumferential direction, and the third pushing portion 227 is located on the front side of the second pushing portion 294 along a direction of the seat 170 away from the rear wheel frame 130. The third connecting seat 230 is provided with a limiting groove 236 for accommodating the second pushing portion 294 and the third pushing portion 227, the limiting groove 236 penetrates the third connecting seat 230 in a direction parallel to the axial direction and extends along the circumferential direction, and the limiting groove 236 can be used for the second pushing portion 294 and the third pushing portion 227 to move along the circumferential direction.

The second pushing portion 294 may extend toward the third connecting seat 230 and be disposed at an axial distance from the third connecting seat 230, and specifically, the second pushing portion 294 protrudes from a bottom wall of the fourth accommodating space 291 in the fourth connecting seat 290 toward the third connecting seat 230. The third pushing portion 227 faces the third connecting seat 230 and is disposed at an axial distance from the third connecting seat 230, and specifically, the third pushing portion 227 protrudes from the surface of the second connecting seat 220 facing the third connecting seat 230 toward the third connecting seat 230. The second pushing portion 294 and the third pushing portion 227 extend in a direction parallel to the axial direction as a preferred embodiment.

When the seat 170 pivots in the circumferential direction in a direction away from the rear wheel frame 130, the second abutting portion 294 of the seat 170 urges the third abutting portion 227 to rotate in the same direction. In turn, the front wheel frame 120 also pivots in a circumferential direction away from the rear wheel frame 130 to more quickly complete the deployment action of the cart 1000.

When the third pushing portion 227 moves in the direction in which the seat 170 is away from the rear wheel frame 130 until the end portion that is abutted to the limit groove 236 and is circumferentially close to the third pushing portion 227, the angle between the front wheel frame 120 and the rear wheel frame 130 is just the first angle α1. And when the second pushing portion 294 moves in the direction in which the seat 170 approaches the rear wheel frame 130 and abuts against the end of the limit groove 236 that is circumferentially close to the second pushing portion 294, the angle between the seat 170 and the rear wheel frame 130 is just the angle between the two when the cart 1000 is in the folded state. That is, both ends of the limiting groove 236 in the circumferential direction limit the rotational travel of the second abutting portion 294 and the third abutting portion 227, respectively.

The process of switching the cart 1000 from the collapsed state to the extended state includes a first stage and a second stage. In the first stage, the handle frame 110 rotates in a direction away from the front wheel frame 120 in the circumferential direction, and the handle frame 110 drives the rear wheel frame 130 to rotate in a direction away from the front wheel frame 120 in the circumferential direction. In the second stage, the first pushing frame 111 is unfolded relative to the second pushing frame 112, the first pushing frame 111 drives the seat 170 to rotate along the circumferential direction away from the rear wheel frame 130 through the third traction member 180, and the seat 170 drives the front wheel frame 120 to rotate along the circumferential direction away from the rear wheel frame 130.

Referring to fig. 35, 37 and 41, the side of the third connecting seat 230 facing the fourth connecting seat 290 is provided with a guide portion 237, the guide portion 237 extending circumferentially around the axial direction and protruding toward the fourth connecting seat 290 in a direction parallel to the axial direction, and specifically, the guide portion 237 protrudes from the bottom wall of the third accommodating space 232 in the third connecting seat 230 toward the fourth connecting seat 290. The second locking member 280 and the third locking member 310 are sleeved on the radial outer side of the guiding portion 237, and the guiding portion 237 is used for guiding the second locking member 280 and the third locking member 310 to move along the axial direction. The guide portion 237 is provided with a plurality of guide grooves 238, the plurality of guide grooves 238 are formed by axially recessing from the circumferential surface of the guide portion 237, the plurality of guide grooves 238 are arranged at intervals along the circumferential direction, the plurality of guide grooves 238 are used for accommodating the plurality of clamping portions 283 along the direction parallel to the axial direction in a one-to-one correspondence manner, are used for guiding the corresponding clamping portions 283 to move along the direction parallel to the axial direction, and are used for limiting the clamping portions 283 to rotate along the circumferential direction, so as to limit the second locking piece 280 to rotate around the axial direction. In other embodiments, only one engagement portion 283 and one guide slot 238 may be provided.

It should be noted that the terms "first," "second," "third," "fourth," "fifth," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A joint structure, comprising:

a first connecting seat, a second connecting seat, and a third connecting seat, wherein the first connecting seat, the second connecting seat, and the third connecting seat are pivotally connected to each other around an axial direction, the second connecting seat is located between the first connecting seat and the third connecting seat along the axial direction, and the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, and the third connecting seat is provided with a third limiting column, and the first limiting column, the third limiting column, and the second limiting column are arranged in sequence along the circumferential direction; and

The first locking member is movably arranged between the first connecting seat and the second connecting seat, and has a first locking position and a first releasing position, and is located on a radial side of the first limiting column, the second limiting column and the third limiting column. When the first locking member is in the first locking position, the first connecting seat, the second connecting seat and the third connecting seat are relatively fixed, and the third limiting column is in contact with at least one of the first limiting column and the second limiting column; when the first locking member is in the first releasing position, the first connecting seat and the third connecting seat can both pivot relative to the second connecting seat.

2. The joint structure according to claim 1 is characterized in that the first limiting column protrudes toward the second connecting seat, the second limiting column protrudes toward the first connecting seat, the third limiting column protrudes toward the first connecting seat and passes through the second connecting seat, the second connecting seat is provided with a movable groove for the third limiting column to move along the circumferential direction, and the first limiting column and the third limiting column can move along the circumferential direction within the second connecting seat.

3 . The joint structure according to claim 1 , wherein the first locking member is located radially outside the first limiting column, the second limiting column, and the third limiting column.

4. The joint structure according to claim 1 is characterized in that the joint structure further includes a driving member, which is movably arranged between the first connecting seat and the second connecting seat and has an initial position and an unlocking position. When the driving member moves from the initial position to the unlocking position, the driving member drives the first locking member to move from the first locking position to the first releasing position. The driving member and the first locking member are adjacently arranged along the axial direction, and the driving member and the first locking member are both located radially outside the first limiting column, the second limiting column and the third limiting column.

5. The joint structure according to claim 1 is characterized in that the joint structure further includes a second locking member, which is movably arranged in the joint structure and is provided with at least one locking portion, the locking portion is spaced apart from the axial direction, the second locking member has a second locking position and a second release position, when the first locking member is in the first locking position, the second locking member is in the second locking position, the at least one locking portion passes through the third connecting seat and the second connecting seat, when the first locking member is in the first release position, the second locking member is in the second release position, and the at least one locking portion only passes through the third connecting seat or the second connecting seat.

6. The joint structure according to claim 5, characterized in that

When the first locking member moves from the first locking position to the first unlocking position, the first locking member drives the second locking member to move from the second locking position to the second unlocking position.

7. A stroller, comprising: a rider frame, a front wheel frame, a rear wheel frame, and a joint structure according to any one of claims 1 to 6, wherein the rider frame is connected to the first connecting seat, the front wheel frame is connected to the second connecting seat, and the rear wheel frame is connected to the third connecting seat, and the rider frame, the front wheel frame, and the rear wheel frame are pivotally connected to each other via the joint structure so that the stroller can be switched between an extended state and a folded state, and the rear wheel frame is located between the front wheel frame and the rider frame along the circumferential direction;

When the cart is in the extended state, the first locking member is in the first locking position, and the handlebar frame, the front wheel frame, and the rear wheel frame are spaced apart in the circumferential direction;

When the pushcart is in the folded state, the hand frame is circumferentially close to the rear wheel frame, and the rear wheel frame is circumferentially close to the front wheel frame.

8. The cart according to claim 7, wherein when the cart is in the folded state, the first limiting post, the third limiting post and the second limiting post are arranged at intervals along the circumferential direction.

9. The cart according to claim 7, characterized in that it includes: the joint structure according to claim 2, when the cart is in the folded state, the third limiting column circumferentially abuts against the groove wall of the movable groove away from the second limiting column.

10. The cart according to claim 7, wherein:

The first connecting seat is provided with a first engaging member, and the second connecting seat is provided with a second engaging member. The first engaging member and the second engaging member are both located between the first limiting post and the second limiting post along the circumferential direction, and are located on a side of the first limiting post and the second limiting post away from the third limiting post along the circumferential direction;

When the cart is in the folded state, the first engaging member abuts against the second engaging member at a side of the second engaging member close to the second limiting column.