WO2025162190A1 - Pull rod mechanism, frame assembly, seat fixing mechanism and cart - Google Patents

Abstract

A pull rod mechanism, a frame assembly, a seat fixing mechanism and a cart. The pull rod mechanism (2) comprises: a third connection base (194); a rotating portion (192), the rotating portion (192) being connected to the third connection base (194) and being capable of pivoting between a first pivot position and a second pivot position relative to the third connection base (194); a pull rod (19), one end of the pull rod (19) being connected to the rotating portion (192), when the rotating portion (192) is pivoted to the first pivot position, the pull rod (19) being pivoted to an upright position, and when the rotating portion (192) is pivoted to the second pivot position, the pull rod (19) being pivoted to a lie-flat position; and a first positioning member (193), the first positioning member (193) being arranged between the third connection base (194) and the rotating portion (192), and the first positioning member (193) being configured to limit the pivoting of the rotating portion (192). The frame assembly (1) comprises: a base frame (10); front foot rods (11), the lower ends of the front foot rods (11) being capable of pivotally connecting to the base frame (10); rear foot rods (12), the lower ends of the rear foot rods (12) being capable of pivotally connecting to the base frame (10); and a handle assembly (14), the lower ends of the handle assembly (14) being capable of pivotally connecting to the upper ends of the front foot rods (11), and the upper ends of the rear foot rods (12) being capable of pivotally connecting to the handle assembly (14). When the frame assembly (1) is switched from an unfolded state to a folded state, the handle assembly (14) pivots relative to the front foot rods (11), and drives the front foot rods (11) and the rear foot rods (12) to pivot relative to the base frame (10), such that the handle assembly (14), the front foot rods (11) and the rear foot rods (12) are folded towards the base frame (10). The seat fixing mechanism (132) comprises fixing bases (133, 233) and snap-fit bases (134, 234), wherein the snap-fit bases (134, 234) can be pivotally connected to the fixing bases (133, 233), the snap-fit bases (134, 234) can move between folded positions and unfolded positions relative to the fixing bases (133, 233), and the snap-fit bases (134, 234), when located at the unfolded positions, are farther away from the fixing bases (133, 233) than when the snap-fit bases (134, 234) are located at the folded positions. The pull rod mechanism, the frame assembly, the seat fixing mechanism and the cart have simple structures and are easy to fold.

Description

Pull rod mechanism, frame, seat fixing mechanism and cart

Related applications

This application claims priority to Chinese patent application No. 2024101225843, filed on January 29, 2024, entitled “Seat fixing mechanism and cart having the same”; Chinese patent application No. 2024101327067, filed on January 29, 2024, entitled “Pull rod mechanism and cart having the same”; Chinese patent application No. 2024101224022, filed on January 29, 2024, entitled “Frame and cart having the same”; and Chinese patent application No. 2024105668802, filed on May 8, 2024, entitled “Frame, pull rod mechanism, seat fixing mechanism and cart”, the entire text of which is hereby incorporated by reference.

Technical Field

The present application relates to the technical field of baby carriages, and in particular to a pull rod mechanism, a carriage frame, a seat fixing mechanism and a stroller.

Background Art

Strollers, such as campers and child strollers, are popular among consumers because they can accommodate infants and young children while also carrying items. However, strollers on the market often have the problem of being unable to fold or being inconvenient to fold. For ease of use, strollers are generally provided with a pull rod to facilitate users to pull the stroller. However, the pull rods of strollers currently on the market are not convenient for users to operate, and it is necessary to design a new pull rod mechanism and a stroller with the same. In addition, strollers can generally be equipped with seat devices such as safety seats and carry baskets for children to sit on. However, the seat fixing mechanisms in strollers currently on the market have complex structures, and the seat fixing mechanisms cannot be folded when the seat device is not installed, which in turn affects the use and folding of the stroller.

Summary of the Invention

Based on this, it is necessary to provide a frame that can be quickly folded, a pull rod mechanism that is convenient for users to operate, a seat fixing mechanism with a simple structure and easy to fold, and a cart to address at least one of the above technical problems.

According to one aspect of the present application, a bicycle frame is provided, comprising: a chassis; a front foot bar, the lower end of which is pivotally connected to the chassis; a rear foot bar, the lower end of which is pivotally connected to the chassis; and a rider, the lower end of the rider is pivotally connected to the upper end of the front foot bar, and the upper end of the rear foot bar is pivotally connected to the rider; when the bicycle frame switches from an expanded state to a folded state, the rider pivots relative to the front foot bar, and drives the front foot bar and the rear foot bar to pivot relative to the chassis, so that the rider, the front foot bar and the rear foot bar are folded toward the chassis.

When the frame according to the embodiment of the present application is folded, the frame can be folded quickly and easily by the rider simply pushing it.

In one embodiment, when the frame switches from the expanded state to the folded state, the rider and the rear leg bar pivot toward the front of the frame, and the front leg bar pivots toward the rear of the frame.

In one embodiment, when the frame switches from the expanded state to the folded state, the angle between the rider and the rear foot bar gradually decreases.

In one embodiment, the frame further includes: a locking joint connected to the lower end of the rider and the upper end of the front foot bar, the locking joint being configured to lock the rider and the front foot bar to prevent the rider and the front foot bar from pivoting relative to each other; and a releasing mechanism provided on the rider, the releasing mechanism being configured to release the locking of the rider and the front foot bar by the locking joint to allow the rider and the front foot bar to pivot relative to each other.

In one embodiment, the locking joint includes: a first connecting seat, the upper end of which is connected to the rider; a second connecting seat, the lower end of which is connected to the front foot rod, and the second connecting seat is pivotally connected to the first connecting seat; and a locking member, which is arranged in the first connecting seat and has a locking position, in which the locking member locks the first connecting seat and the second connecting seat to prevent relative pivoting of the first connecting seat and the second connecting seat.

In one embodiment, the release mechanism includes: a release operating member, which is arranged on the rider and is operably connected to the locking member, and the release operating member is configured to drive the locking member to slide to a release position to release the locking member from locking the first connecting seat and the second connecting seat, allowing the first connecting seat and the second connecting seat to pivot relative to each other.

In one embodiment, the locking joint further comprises: a first reduction member fixed in the first connecting seat and abutting against the locking member, wherein the first reduction member is configured to cause the locking member to have a movement tendency of sliding to a locking position.

In one embodiment, the release mechanism further includes: a first connecting member, one end of the first connecting member is connected to the release operating member, the other end of the first connecting member is connected to the locking member, and the release operating member drives the locking member to slide to the release position through the first connecting member.

In one embodiment, a first locking groove and a first locking protrusion are formed at one end of the second connecting base, and a second locking protrusion and a second locking groove are formed at one end of the locking member. When the locking member is in the locked position, the second locking protrusion fits in the first locking groove, and the first locking protrusion fits in the second locking groove.

In one embodiment, the frame further comprises a support bracket pivotally connected to the locking joint.

In one embodiment, the bicycle frame further comprises a linkage rod, one end of the linkage rod being pivotally connected to the support frame, and the other end of the linkage rod being pivotally connected to the rear leg lever. A pivot point between the rear leg lever and the rider is located on the rider's side facing inwardly of the bicycle frame, and a projection of a pivot path of the rear leg lever in the height direction does not overlap with a projection of a pivot path of the front leg lever and/or the rider in the height direction.

In one embodiment, when the vehicle frame switches from the expanded state to the folded state, the linkage rod pivots toward the rear of the vehicle frame, the rear leg rod pivots toward the front of the vehicle frame, and the angle between the linkage rod and the rear leg rod gradually increases.

In one embodiment, the frame further includes a support frame pivotally connected to the rider.

In one embodiment, the bicycle frame further comprises a linkage rod, one end of the linkage rod being pivotally connected to the support frame, and the other end of the linkage rod being pivotally connected to the front leg rod. A pivot point between the rear leg rod and the rider is located below the rider in the height direction, and a projection of the rear leg rod's pivot path in the height direction at least partially overlaps with the pivot path of the front leg rod and/or the rider's projection in the height direction.

In one embodiment, when the vehicle frame switches from the expanded state to the folded state, the linkage rod pivots toward the rear of the vehicle frame, the rear leg rod pivots toward the front of the vehicle frame, and the angle between the linkage rod and the rear leg rod gradually increases.

In one embodiment, the chassis includes: two first rods, the first rods extending roughly along the length direction, and the first rods are formed with a first curved portion protruding toward the interior of the frame to form a first avoidance space. When the frame is in a folded state, at least a portion of the front leg rod is located in the first avoidance space.

In one embodiment, a second curved portion is formed on the rear foot bar and protrudes toward the rear of the frame to form a second escape space. When the frame is in the folded state, at least a portion of the rider is located in the second escape space.

In one embodiment, the chassis further comprises: two second rods, the second rods extending generally along the width direction. The two first rods and the two second rods form a generally rectangular structure. A second reinforcing rod is disposed between the two first rods, with both ends of the second reinforcing rod respectively connected to the first bent portions of the two first rods.

In one embodiment, the chassis includes: two first rods, the first rods extending substantially along a length direction; two second rods extending substantially along a width direction; and at least one first reinforcing rod disposed between the two first rods.

According to another aspect of the present application, a stroller is provided, comprising a frame according to at least one of the aforementioned embodiments.

When folding the stroller according to the embodiment of the present application, the stroller frame can be easily and quickly folded by the rider simply by pushing it.

According to another aspect of the present application, a pull rod mechanism is provided, comprising: a third connecting seat; a rotating portion connected to the third connecting seat and capable of pivoting relative to the third connecting seat between a first pivot position and a second pivot position; a pull rod, one end of which is connected to the rotating portion. When the rotating portion pivots to the first pivot position, the pull rod pivots to an upright position; when the rotating portion pivots to the second pivot position, the pull rod pivots to a lying position; and a first positioning member disposed between the third connecting seat and the rotating portion, the first positioning member being configured to limit pivoting of the rotating portion.

According to the embodiment of the present application, the pull rod mechanism can be easily adjusted and positioned for use, thereby realizing adjustment of the use angle of the pull rod, and is easy to operate and has wide applicability.

In one embodiment, the first positioning member is a damping plate, and the damping plate is clamped between the rotating portion and the third connecting seat.

In one embodiment, one end of the third connecting seat is recessed inward to form a pivoting space, at least a portion of the rotating portion is accommodated in the pivoting space, and the damping sheet is clamped between the rotating portion and a side wall of the pivoting space.

In one embodiment, the pivot space includes two oppositely arranged side walls, at least a portion of the rotating part is located between the two side walls of the pivot space, and the first positioning member includes two damping plates, which are respectively clamped between the two side walls of the pivot space and the rotating part.

In one embodiment, the first positioning member includes: a positioning recess, which is provided in one of the rotating part and the third connecting seat; and a positioning protrusion, which is provided in the other of the rotating part and the third connecting seat. When the positioning recess enters the positioning protrusion, the shape matching of the positioning recess and the positioning protrusion limits the pivoting of the rotating part.

In one embodiment, one end of the third connecting seat is recessed inward to form a pivot space, at least a portion of the rotating part is accommodated in the pivot space, and the inner surface of at least one side wall of the pivot space faces at least one surface of the rotating part; the surface of the rotating part and one of the side walls of the pivot space are provided with at least one elastic finger, and the surface of the rotating part and the other side wall of the pivot space are provided with multiple positioning recesses, and the positioning protrusion is provided on the side of the elastic finger facing the positioning recess, and the positioning protrusion is engaged with one of the multiple positioning recesses to position the pull rod at one of the multiple pivot angles.

In one embodiment, one end of the third connecting seat is recessed inward to form a pivot space, at least a portion of the rotating part is accommodated in the pivot space, and a limiting groove is provided on the inner wall of the pivot space of the third connecting seat; the rotating part is provided with a limiting protrusion, and the limiting protrusion slides in the limiting groove as the rotating part pivots, wherein, when the rotating part pivots from the first pivot position to the second pivot position, the limiting protrusion abuts against the side wall of the limiting groove to limit the rotating part from continuing to pivot.

In one embodiment, the pull rod mechanism also includes: a sliding rail, the third connecting seat is connected to the sliding rail and can slide along the sliding rail between a first sliding position and a second sliding position; when the third connecting seat slides to the first sliding position, the pull rod slides to the extended position; when the third connecting seat slides to the second sliding position, the pull rod slides to the storage position.

In one embodiment, the pull rod mechanism further includes: a locking device, which is provided on the third connecting seat and the slide rail, and the locking device is used to lock the third connecting seat in the first sliding position and/or the second sliding position.

In one embodiment, the third connecting seat is provided with a first through hole that can be slidably mounted on the slide rail, and the locking device includes: a second through hole, which is provided on the side wall of the first through hole; a second positioning hole, which is provided in the part of the slide rail corresponding to the first sliding position of the third connecting seat; a second positioning member, which is provided in the slide rail, and at least a portion of the second positioning member can slide in the second positioning hole to retract and protrude from the second positioning hole; when the third connecting seat slides to the first sliding position, at least a portion of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat in the first sliding position.

In one embodiment, the third connecting seat is provided with a first through hole that can be slidably mounted on the slide rail, and the locking device includes: a second through hole, which is provided on the side wall of the first through hole; a third positioning hole, which is provided in the part of the slide rail corresponding to the second sliding position of the third connecting seat; a third positioning member, which is provided in the slide rail, and at least a portion of the third positioning member is slidable in the third positioning hole to retract and protrude the third positioning hole; when the third connecting seat slides to the second sliding position, at least a portion of the third positioning member protrudes from the third positioning hole and enters the second through hole to lock the third connecting seat in the second sliding position.

In one embodiment, the pull rod mechanism further includes: a fixed portion, the slide rail is connected to the fixed portion, and when the rotating portion pivots from the second pivot position to the first pivot position, the pull rod abuts against the front surface of the fixed portion to limit the rotating portion from continuing to pivot.

In one embodiment, the rotating part includes: a main body, which is configured as a roughly cylindrical structure; and a connecting end, which is configured as a boss protruding from the cylindrical surface of the main body, the boss is provided with a first connecting hole, and one end of the pull rod is inserted into the first connecting hole.

In one embodiment, one end of the third connecting seat is recessed inward to form a pivot space. The shape of the pivot space is set to be roughly cylindrical to match the shape of the main body of the rotating part. The main body of the rotating part is pivotally arranged in the pivot space.

In one embodiment, a first through hole is provided at the other end of the third connecting seat, and the first through hole is slidably mounted on the slide rail.

In one embodiment, a second through-hole is provided on a sidewall of the first through-hole; a second positioning hole is provided on a portion of the slide rail corresponding to the first sliding position of the third connecting base; a second positioning member is provided within the slide rail, and at least a portion of the second positioning member is slidable within the second positioning hole to retract and protrude from the second positioning hole. When the third connecting base slides to the first sliding position, at least a portion of the second positioning member protrudes from the second positioning hole and enters the second through-hole, thereby locking the third connecting base in the first sliding position.

In one embodiment, the second positioning member is a spring sheet having a first protrusion, and the first protrusion is slidable in the second positioning hole.

In one embodiment, a second through-hole is provided on a sidewall of the first through-hole. A third positioning hole is provided on a portion of the slide rail corresponding to the second sliding position of the third connecting base. A third positioning member is provided within the slide rail, and at least a portion of the third positioning member is slidable within the third positioning hole to retract and protrude from the third positioning hole. When the third connecting base slides to the second sliding position, at least a portion of the third positioning member protrudes from the third positioning hole and enters the second through-hole, thereby locking the third connecting base in the second sliding position.

In one embodiment, the third positioning member is a spring sheet having a second protrusion, and the second protrusion is slidable in the third positioning hole.

In one embodiment, a limiting protrusion is provided on the cylindrical surface of the main body of the rotating portion. A limiting groove is provided on the inner wall of the pivoting space of the third connecting seat. When the rotating portion pivots, the limiting protrusion slides within the limiting groove. When the rotating portion pivots from the first pivot position to the second pivot position, the limiting protrusion abuts against the sidewall of the limiting groove to limit further pivoting of the rotating portion.

In one embodiment, the pull rod mechanism further comprises: a fixed portion, the slide rail being connected to the fixed portion. When the rotating portion pivots from the second pivot position to the first pivot position, the pull rod abuts against a front surface of the fixed portion to restrict the rotating portion from further pivoting.

In one embodiment, the pull rod mechanism further includes a front rod and a rear rod, wherein the front rod and the rear rod are each fixed with a fixing portion, and the ends of the slide rail are respectively connected to the two fixing portions. When the rotating portion pivots from the second pivot position to the first pivot position, the pull rod abuts against a front surface of the fixing portion fixed to the front rod to restrict further pivoting of the rotating portion.

In one embodiment, the pull rod mechanism further comprises: at least one receiving member, the receiving member being provided on the front rod and having a receiving slot provided therein, wherein when the pull rod slides to the receiving position, at least a portion of the pull rod is received in the receiving slot.

In one embodiment, the pull rod includes: a connecting rod, one end of which is connected to the rotating portion; and a handle, which is connected to the other end of the connecting rod. When the pull rod slides to the storage position, the handle is stored in the storage groove.

In one embodiment, two receiving members are provided, the two receiving members are separated by a fixing portion provided on the front rod, and the openings of the receiving slots of the two receiving members are arranged opposite to each other.

In one embodiment, a receiving member is provided. The receiving member is arranged at the lower side of the fixing portion, and the opening of the receiving slot of the receiving member faces the front of the fixing portion.

In one embodiment, the first positioning member is a damping plate, which is clamped between an end surface of the main body of the rotating part and an inner surface of a side wall of the pivoting space facing the rotating part.

In one embodiment, the damping sheet is a flexible component.

In one embodiment, the material of the damping sheet includes at least one of soft colloid, rubber material, and plastic material.

In one embodiment, the first positioning member includes a positioning recess provided on one of an end surface of the rotating portion's main body and an inner wall of the pivoting space; and a positioning projection provided on the other of the end surface of the rotating portion's main body and an inner wall of the pivoting space. When the positioning recess enters the positioning projection, the shapes of the positioning recess and the positioning projection cooperate to restrict pivoting of the rotating portion.

According to another aspect of the present application, a cart is provided, comprising: a base frame, and the pull rod mechanism of the aforementioned embodiment. The pull rod mechanism is connected to the base frame.

According to the embodiment of the present application, the pull rod mechanism of the cart can be easily adjusted and positioned for use, thereby realizing adjustment of the use angle of the pull rod, and is easy to operate and has wide applicability.

According to one aspect of the present application, a seat fixing mechanism is provided, comprising: a fixing seat; and a snap-fit seat, the snap-fit seat being slidably connected to the fixing seat, the snap-fit seat being capable of moving between a folded position and an expanded position relative to the fixing seat, the snap-fit seat being further away from the fixing seat when in the expanded position than when in the folded position.

The seat fixing mechanism according to an embodiment of the present application is simple in structure, easily folds, and does not interfere with other stroller components. In one embodiment, the snap-fit seat includes: an engaging portion configured to be inserted into an engaging slot in the seat; and a base portion connected to the engaging portion and pivotally connected to the fixing seat. A circular arc-shaped transition region is defined between the engaging portion and the base portion, and the width of the engaging portion is smaller than that of the base portion.

In one embodiment, the upper end of the engaging portion is provided with a first latching hole; and/or the lower end of the base portion is provided with a second latching hole.

In one embodiment, the fixing seat is provided with a connecting end portion, and the engaging seat is provided with a third connecting slot, and the connecting end portion is inserted into the third connecting slot to pivotally connect the fixing seat and the engaging seat.

In one embodiment, at least one first protrusion and at least one first recess are formed on the connection end portion toward one end of the snap-fit seat, a first inclined surface is provided between the first protrusion and the first recess, and at least one second protrusion and at least one second recess are formed on the bottom wall of the third connecting groove, a second inclined surface is provided between the second protrusion and the second recess, when the snap-fit seat is in the folded position, the second protrusion is engaged in the first recess, and the first protrusion is engaged in the second recess, when the snap-fit seat is pivoted from the folded position to the expanded position, the first protrusion disengages from the second recess, and through the cooperation of the second inclined surface and the first inclined surface, the first protrusion slides to a position abutting the second protrusion, and the snap-fit seat slides in a direction away from the fixed seat.

In one embodiment, the connecting end portion is formed with two opposing first protrusions and two opposing first recesses at one end facing the engaging seat, the two first protrusions being separated by two first recesses, and a first inclined surface being provided between adjacent first protrusions and first recesses. The bottom wall of the third connecting groove is formed with two opposing second protrusions and two opposing second recesses, the two second protrusions being separated by two second recesses, and a second inclined surface being provided between adjacent second protrusions and second recesses. When the engaging seat is in the retracted position, the two second protrusions respectively engage in the two first recesses, and the two first protrusions respectively engage in the two second recesses. When the engaging seat pivots from the retracted position to the deployed position, the first protrusion disengages from the second recess, and through the engagement of the second inclined surface with the first inclined surface, the first protrusion slides to a position abutting against the second protrusion, and the engaging seat slides in a direction away from the fixed seat.

In one embodiment, the snap-fit seat is provided with a mounting through hole, an end cover and a first elastic member are provided in the mounting through hole, the end cover is connected to the fixed seat, one end of the first elastic member abuts against the end wall of the mounting through hole, and the other end of the first elastic member abuts against the end cover, and the first elastic member continuously applies pressure to the snap-fit seat, so that the snap-fit seat has a tendency to slide toward the fixed seat.

In one embodiment, a locking hole is provided at the connecting end, and the engaging seat includes a releasing operating member. When the engaging seat pivots to the expanded position, at least a portion of the releasing operating member enters the locking hole to lock the engaging seat in the expanded position.

In one embodiment, the engaging seat includes a mounting cavity, and the release operating member is slidably disposed in the mounting cavity. The release operating member includes a locking portion that, when the engaging seat pivots to the deployed position, enters a locking hole to lock the engaging seat in the deployed position; and a pressing portion that is connected to the locking portion and, by applying pressure to the pressing portion, causes the release operating member to slide away from the locking hole, disengaging the locking portion from the locking hole to release the locking of the engaging seat.

In one embodiment, the locking seat includes a second elastic member, one end of the second elastic member is fixed in the installation cavity, and the other end of the second elastic member is against the release operating member. The second elastic member continuously applies pressure to the release operating member, so that the release operating member has a tendency to slide toward the third connecting groove.

In one embodiment, one of the fixed seat and the engaging seat is provided with a pivot shaft, and the other of the fixed seat and the engaging seat is provided with a mounting hole. The mounting hole is sleeved on the pivot shaft, and the engaging seat is capable of pivoting about the pivot shaft and sliding along the axial direction of the pivot shaft. When the engaging seat is pivoted to the retracted position, the engaging seat does not protrude above the upper surface of the fixed seat in the height direction.

In one embodiment, one of the fixing seat and the engaging seat is further provided with a limiting portion, and the other of the fixing seat and the engaging seat is further provided with a limiting hole. When the engaging seat pivots to the folded state, the limiting portion is engaged in the limiting hole.

In one embodiment, one of the fixing seat and the engaging seat is further provided with an arc-shaped connecting body, and the other of the fixing seat and the engaging seat is further provided with a groove body, the shape of the groove body matching the shape of the connecting body. When the engaging seat is pivoted to the expanded state, the connecting body is fitted into the groove body.

In one embodiment, one of the connecting body and the slot body is provided with a limiting recess, and the other of the connecting body and the slot body is provided with a limiting member. When the engaging seat pivots to the expanded state, the limiting member engages in the limiting recess to lock the engaging seat in the expanded position.

In one embodiment, the connecting body is provided with a first connecting groove and a first connecting edge, and the groove body is provided with a second connecting groove and a second connecting edge. When the engaging seat pivots to the expanded state, the second connecting groove accommodates the first connecting edge, and the second connecting edge enters the first connecting groove.

In one embodiment, a third elastic member is provided between the fixing seat and the engaging seat. The third elastic member abuts against the engaging seat and continuously applies pressure to the engaging seat, so that the engaging seat has a tendency to slide toward the fixing seat.

According to another aspect of the present application, a stroller is provided, comprising: the seat fixing mechanism of the aforementioned embodiment; a support frame, to which the seat fixing mechanism is fixed; and a seat, which is detachably fixed to the seat fixing mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of the preferred embodiments of the present invention as shown in the accompanying drawings. Like reference numerals indicate like parts throughout the accompanying drawings, and the drawings are not drawn to scale with actual size, but rather focus on illustrating the subject matter of the present invention.

Other features, objects and advantages of the present invention will become more apparent from a reading of the following detailed description of non-limiting embodiments made with reference to the accompanying drawings.

FIG. 1 is a perspective view of a vehicle frame in an unfolded state according to one embodiment of the present application.

FIG. 2 is a side view of the vehicle frame shown in FIG. 1 .

FIG3 is a side view of the vehicle frame shown in FIG1 , wherein the awning is in a retracted state and the pull rod is in a stored state.

4 is a side view of the frame shown in FIG. 1 with the rider and the rear foot bar beginning to pivot toward the front of the frame and the front foot bar beginning to pivot toward the rear of the frame.

5 is a side view of the frame shown in FIG. 1 , wherein the rider and the rear foot bar are further pivoted toward the front of the frame, and the front foot bar is further pivoted toward the rear of the frame.

FIG6 is a side view of the frame shown in FIG1 , wherein the frame has been switched to a folded state.

7 is a partial cross-sectional view from a perspective perspective of a push handle of a bicycle frame according to one embodiment of the present application.

8 is a partial cross-sectional view from a rider's side perspective of a bicycle frame according to one embodiment of the present application.

FIG. 9 is a perspective view of a frame in an unfolded state according to one embodiment of the present application.

FIG10 is a side view of the vehicle frame shown in FIG9 .

11 is a side view of the frame shown in FIG. 9 , with the awning in the stowed position, the pull rod in the stowed position, and the rider beginning to pivot toward the front of the frame and the front leg bar beginning to pivot toward the rear of the frame.

12 is a side view of the frame shown in FIG. 9 , wherein the rider has further pivoted toward the front of the frame, the rear foot bar has begun to pivot toward the front of the frame, and the front foot bar has further pivoted toward the rear of the frame.

FIG13 is a side view of the frame shown in FIG9 , wherein the frame has been switched to a folded state.

14 is a partial cross-sectional view from a rider's side perspective of a bicycle frame according to one embodiment of the present application.

15 is a side view of a cart according to one embodiment of the present application showing the pull bar in an upright position.

16 is a side elevational view of the cart shown in FIG. 15 , showing the pull bar in a use position.

17 is a side view of the stroller shown in FIG. 15 , showing the pull bar in a lying position.

FIG. 18 is a top view of a pull rod mechanism according to an embodiment of the present application.

19 is a perspective view of a cart according to one embodiment of the present application.

20 is a perspective view of a cart according to one embodiment of the present application showing the drawbar mechanism in a partially disassembled state.

21 is a perspective view of a cart from another perspective according to one embodiment of the present application, showing the drawbar mechanism in a partially disassembled state.

22 is a perspective view of a cart according to one embodiment of the present application showing the pull bar in a stowed position.

Figure 23 is a partial cross-sectional view taken along line A-A of Figure 19.

Figure 24 is a partial cross-sectional view taken along line B-B of Figure 22.

25 is a perspective view of a cart according to one embodiment of the present application showing the pull bar in an upright position.

26 is a perspective view of the cart shown in FIG. 25 , showing the pull bar in a stowed position.

FIG27 is a partial cross-sectional view taken along line C-C of FIG26 , in which part of the structure of the cart is omitted.

FIG. 28 is a perspective view of a pull rod mechanism according to one embodiment of the present application.

FIG29 is a partially enlarged cross-sectional view of the pull rod mechanism taken along the virtual plane G shown in FIG28.

30 is a perspective view of a cart according to one embodiment of the present application, wherein the snap-fit seat is in a folded position.

31 is a perspective view of a cart according to one embodiment of the present application with the snap fit in an expanded position.

FIG32 is a side view of a seat fixing mechanism according to an embodiment of the present application, wherein the engaging seat is in a retracted position.

FIG33 is a side view of a seat fixing mechanism according to an embodiment of the present application, wherein the snap-fit seat is in an expanded position.

34 is a top view of the cart according to one embodiment of the present application, wherein the engaging seat is in a folded position.

35 is a top view of a cart according to one embodiment of the present application, wherein the snap-fit seat is in an expanded position.

36 is a top view of a stroller with a seat installed according to one embodiment of the present application.

37 is a side view of the stroller shown in FIG. 36 with a seat installed.

FIG38 is a cross-sectional view of the seat fixing mechanism taken along line I-I of FIG34 , in which other structures of the stroller are omitted.

FIG39 is a cross-sectional view of the seat fixing mechanism taken along line J-J of FIG35 , in which other structures of the stroller are omitted.

FIG. 40 is a partial exploded view of a seat securing mechanism according to one embodiment of the present application.

FIG. 41 is an exploded view of a seat securing mechanism according to one embodiment of the present application.

42 is a perspective view of a cart according to one embodiment of the present application, wherein the snap-fit seat is in a folded position.

FIG43 is an enlarged view of portion D in FIG42.

44 is a perspective view of a cart according to one embodiment of the present application with the snap fit in an expanded position.

FIG45 is an enlarged view of portion E in FIG44.

46 is a top view of the cart according to one embodiment of the present application, wherein the snap-fit seat is in a folded position.

47 is a top view of a cart according to one embodiment of the present application, with the snap-fit mount in an expanded position.

FIG48 is an enlarged view of portion F in FIG46.

FIG. 49 is a partial exploded view of a seat securing mechanism according to one embodiment of the present application.

50 is a perspective view of a vehicle frame according to one embodiment of the present application.

51 is a perspective view of a container according to one embodiment of the present application.

Reference Signs List
1. Frame, 10. Underframe, 100. First rod, 101. First reinforcing rod, 102. Second reinforcing rod, 103. Second rod, 1031.
Front rod, 1032, rear rod, 11, front foot rod, 110, front foot seat, 1001, first bend, 1002, folding hook, 10010, first avoidance space, 12, rear foot rod, 120, rear foot seat, 121, second bend, 1210, second avoidance space, 122, outer protrusion, 123, inner concave, 13, support frame, 130, dining tray assembly, 131 awning assembly, 132, seat fixed Fixed mechanism, 133, fixed seat, 1331, first elastic member, 1332, lock hole, 1333, connecting end, 13331, first protrusion, 13332, first recess, 13333, first inclined surface, 13334, first connecting shaft, 13335, limiting rib, 1334, mounting groove, 1335, end cover, 134, engaging seat, 1340, mounting through hole, 1341, unlocking operating member, 13 411, locking portion, 13412, pin, 13413, pressing portion, 13414, second elastic member, 1342, third connecting groove, 13421, second protrusion, 13422, second recess, 13423, second inclined surface, 13424, raised portion, 13425, matching hole, 13426, limiting groove, 1343, mounting cavity, 13431, slide groove, 1344, cover plate, 1345, Shell, 1346, joint, 1347, first clamping hole, 1348, second clamping hole, 1349, base, 135, seat, 14, rider, 140, inner rod, 141, outer rod, 1410, locking hole, 142, push handle, 143, connecting protrusion, 145, extension rod, 15, locking joint, 151, first connecting seat, 1510, first protrusion 152, second connecting seat, 1520, first Locking groove, 1521, first locking protrusion, 1522, second protrusion, 16, release mechanism, 160, release operating member, 161, first connecting member, 162, locking member, 163, first reset member, 1620, second locking protrusion, 1621, second locking groove, 17, rider length adjustment mechanism, 170, adjustment button, 171, second reset member, 172, second connecting member, 173, adjustment member, 1 730, straight slot, 1731, locking member, 1732, pin, 174, driving member, 175, third reset member, 18, linkage rod, 19, pull rod, 190, handle, 1901, handle, 1902, mounting portion, 191, connecting rod, 1910, first pivot hole, 192, rotating portion, 1921, main body, 1922, connecting end, 19220, first connecting hole, 19221, receiving cavity , 1923, limiting convex, 1924, second pivot hole, 193, first positioning member, 1931, damping plate, 19310 third pivot hole, 1932, first positioning concave, 194, third connecting seat, 1941, first through hole, 1942, second through hole, 1943, fourth pivot hole, 1944, pivot space, 19440, limiting groove, 19441, side wall, 1945, first limiting convex, 1 95. Pivot pin, 196. Slide rail, 1960. Second positioning member, 1961. Second positioning hole, 19601. First boss, 1962. Third positioning member, 1963. Third positioning hole, 19621. Second boss, 197. Storage member, 1970. Storage slot, 198. Fixing portion, 1980. Fixing hole, 1981. First fixing portion, 1982. Second fixing portion, 199. Elastic finger.
2. Pull rod mechanism, 233, fixed seat, 2330, connector, 2331, first connecting groove, 2332, first connecting edge, 2333,
Limiting portion, 23331, elastic member, 23332, guiding slope, 2334, limiting recess, 234, snap-fit seat, 2340, groove body, 2341, second connecting groove, 2342, second connecting edge, 2343, mounting hole, 2344, limiting hole, 2345, limiting member, 2356, joint portion, 2347, first snap-fit hole, 2348, second snap-fit hole, 2349, base, 235, pivot axis.
3. Storage assembly, 30. Mounting frame, 301. Outer wall, 302. First protrusion, 303. Second protrusion, 304. First engaging groove,
31. Container, 32. Engaging mechanism, 321. Engaging edge, 322. Locking protrusion, 323. Deformation groove, 324. Second engaging groove, 3241. Guide portion, 3242. Engaging portion, 3243. Opening, 33. Support rib.
4. Pivot assembly, 41. First joint, 42. Second joint, 410. Release button.
D1, plane, D2, extension direction, D3, direction, D4, direction, H, height direction, L, length direction, W, width direction.
L1, L2, L1', L2', spacing, α, β, γ, angle.

DETAILED DESCRIPTION

To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to Figures 1 to 6 , Figure 1 shows a frame 1 according to one embodiment of the present application, which includes a base frame 10; a front leg bar 11; a rear leg bar 12; and a rider 14. The lower end of the front leg bar 11 is pivotally connected to the base frame 10; the lower end of the rear leg bar 12 is pivotally connected to the base frame 10; the lower end of the rider 14 is pivotally connected to the upper end of the front leg bar 11, and the upper end of the rear leg bar 12 is pivotally connected to the rider 14. The frame 1 can be switched between an expanded state (as shown in Figure 1) and a collapsed state (as shown in Figure 6). For convenience of description, terms indicating relative positions, such as "upper," "lower," "front," and "rear," are used in this application. These terms indicating relative positions are based on the orientation of the frame 1 when it is in the expanded state. Specifically, a position farther from the support plane of the frame 1 is referred to as "upper," and a position relatively closer to the support plane of the frame 1 is referred to as "lower." For example, the upper end of the front leg bar 11 refers to the end of the front leg bar 11 relatively farther from the support plane of the frame 1 when the frame 1 is in the unfolded state, and the lower end of the front leg bar 11 refers to the end of the front leg bar 11 relatively closer to the support plane of the frame 1 when the frame 1 is in the unfolded state. Specifically, the end of the frame 1 farther from the user when the stroller is pushed forward by the rider 14 is referred to as "front," and the end of the frame 1 relatively closer to the user is referred to as "rear." For example, the front of the frame 1 is the left side in FIG. 2 , and the rear of the frame 1 is the right side in FIG. 2 .

In the embodiment shown in FIG1 , the chassis 10 includes two first bars 100 and two second bars 103 . The first bars 100 extend generally along a length direction L, and the second bars 103 extend generally along a width direction W. The two first bars 100 and the two second bars 103 form a generally rectangular structure. Optionally, at least one first reinforcing bar 101 is disposed between the two first bars 100 to enhance the overall structural stability of the chassis 10. When the chassis 1 is in the deployed state, the first bars 100, the front leg bars 11, the rear leg bars 12, and a portion of the rider 14 form a polygonal structure. In this embodiment, the first bars 100, the front leg bars 11, the rear leg bars 12, and a portion of the rider 14 form a generally triangular structure (an acute triangle in this embodiment, but may be an obtuse or right triangle in other embodiments) to ensure vehicle stability.

Referring to Figures 2 to 6 , when the bicycle frame 1 switches from the deployed state to the collapsed state, the rider 14 and the rear leg bar 12 pivot toward the front of the bicycle frame 1, the angle β between the rider 14 and the rear leg bar 12 gradually decreases, and the front leg bar 11 pivots toward the rear of the bicycle frame 1. The first rod 100, the front leg bar 11, the rear leg bar 12, and the rider 14 no longer maintain a roughly triangular configuration. During the collapse process, the rider 14 pivots relative to the front leg bar 11, driving the front and rear leg bars 11, 12 to pivot relative to the base frame 10, causing the rider 14, the front leg bar 11, and the rear leg bar 12 to collapse toward the base frame 10. With the inner angle of the polygonal structure serving as the angle between the first rod 100, the front leg rod 11, the rear leg rod 12, and the rider 14, during the folding process, the angle between the rider 14 and the rear leg rod 12 (an acute angle in this embodiment) gradually decreases, the angle between the front leg rod 11 and the chassis 10 (an acute angle in this embodiment) gradually decreases, and the angle between the rear leg rod 12 and the chassis 10 (an acute angle in this embodiment) gradually decreases. As a result, the rider 14, the front leg rod 11, and the rear leg rod 12 gradually approach the chassis 10 until they are tightly stacked together in the height direction H. At this point, the bicycle frame 1 switches to the folded state, as shown in FIG6 . Thus, the rider 14 pivots relative to the front leg rod 11, driving the front leg rod 11 and the rear leg rod 12 to pivot and fold relative to the chassis 10, enabling the bicycle frame to be quickly folded. In this embodiment, compared to the deployed state (as shown in FIG1 ), the pivot directions of the rider 14 and the rear leg bar 12 are opposite to the pivot direction of the front leg bar 11. The dimensions of the frame 1 in the folded state (as shown in FIG6 ) are significantly reduced in the height direction H and the length direction L, thereby making it easier to store and accommodate, for example, in the trunk of a car. Furthermore, due to the significant reduction in the size of the frame 1 in the folded state, the user can more easily lift and carry the stroller. Optionally, a folding hook 1002 is provided on the front leg bar 11, and a connecting protrusion 143 is provided on the rider 14. When the frame 1 is switched to the folded state, the folding hook 1002 can be hooked onto the connecting protrusion 143 to maintain the frame 1 in the folded state and prevent accidental deployment.

Referring to Figures 1 to 6 , the frame 1 is also provided with a locking joint 15. The locking joint 15 is connected to the lower end of the rider 14 and the upper end of the front leg bar 11, and the rider 14 and the front leg bar 11 are pivotally connected via the locking joint 15. Specifically, the locking joint 15 includes a first connecting seat 151 and a second connecting seat 152 that are pivotally connected to each other. The upper end of the first connecting seat 151 is connected to the lower end of the rider 14; and the lower end of the second connecting seat 152 is connected to the upper end of the front leg bar 11. The locking joint 15 is configured such that when the frame 1 is in the deployed state, the first connecting seat 151 and the second connecting seat 152 of the locking joint 15 are locked to each other and cannot pivot relative to each other, thereby locking the rider 14 and the front leg bar 11 and preventing relative pivoting of the rider 14 and the front leg bar 11, so that the frame 1 remains stably in the deployed state. When the first connecting seat 151 and the second connecting seat 152 are released, the rider 14 and the front leg rod 11 are allowed to pivot relative to each other, allowing the frame 1 to switch from the expanded state to the collapsed state. It should be noted that, optionally, the first connecting seat 151 and the rider 14 are formed separately and then connected by welding, rivets, or other connection methods. Alternatively, the first connecting seat 151 and the rider 14 can form an integrated structure. In such an embodiment, the lower end of the rider 14 and the upper end of the front leg rod 11 are directly connected together during the molding process. Similarly, the second connecting seat 152 can also be formed separately from the front leg rod 11 or form an integrated structure.

8 , in one embodiment, the locking joint 15 is provided with a locking member 162. The locking member 162 has a locking position. When the locking member 162 is in the locking position, the locking member 162 locks the first connecting seat 151 and the second connecting seat 152 to prevent the first connecting seat 151 and the second connecting seat 152 from pivoting relative to each other.

Continuing with FIG8 , in one embodiment, the locking member 162 can slide along the axial direction of the first connecting seat 151 (the lengthwise direction of the rider 14 in this embodiment). A second locking protrusion 1620 and a second locking groove 1621 are formed on the end of the locking member 162 facing the second connecting seat 152. A first locking groove 1520 and a first locking protrusion 1521 are formed on the end of the second connecting seat 151 facing the first connecting seat 151. When the locking member 162 moves to the locked position, the second locking protrusion 1620 fits into the first locking groove 1520, and the first locking protrusion 1521 fits into the second locking groove 1621. At this point, the side of the first locking protrusion 1521 facing the locking member 162 abuts against the inner wall of the second locking groove 1621, the sidewall of the first locking protrusion 1521 abuts against the sidewall of the second locking protrusion 1620, and the side of the second locking protrusion 1620 facing the second connecting seat 152 abuts against the inner wall of the first locking groove 1520. Thus, the first and second connecting seats 151, 152 are locked by the sliding engagement of the locking member 162 with the first connecting seat 151, the abutting engagement of the second locking protrusion 1620 with the first locking groove 1520, and the abutting engagement of the first locking protrusion 1521 with the second locking groove 1621. This prevents relative pivoting of the first and second connecting seats 151, 152. As a result, the rider 14 and the front leg bar 11 are locked, preventing relative pivoting of the rider 14 and the front leg bar 11, and the bicycle frame 1 can be stably maintained in the deployed state.

It should be noted that in this embodiment, the locking member 162 is coaxially arranged with the first connecting seat 151. In other embodiments, the locking member 162 can be arranged to one side of the axial line of the first connecting seat 151, as long as the locking member 162 can slide along the axial direction of the first connecting seat 151 and lock with the second connecting seat 152.

In this embodiment, the first connecting seat 151 has a first extension and a first recess at one end proximal to the second connecting seat 152. The second connecting seat 152 has a second extension and a second recess at one end proximal to the first connecting seat 151. When the first and second connecting seats 151 and 152 are locked together, the first extension is received in the second recess, and the second extension is received in the first recess. The projections of the first and second extensions along the width direction W overlap. In this embodiment, the rider 14 and the front foot bar 11 have circular outer circumferences, and the first and second extensions also have circular outer circumferences to connect the rider 14 and the front foot bar 11. A first locking groove 1520 and a first locking protrusion 1521 are provided at the ends of the second extension. The locking member 162 is spaced away from the front foot bar 11 relative to the first extension.

Referring to Figures 3 to 5 and Figure 8 , the first connecting seat 151 further includes a first protrusion 1510 projecting from one side of the first extension, and the second connecting seat 152 includes a second protrusion 1522 projecting from one side of the second extension. When the first connecting seat 151 and the second connecting seat 152 are locked together, the first protrusion 1510 and the second protrusion 1522 overlap in the width direction W. The pivot point between the first connecting seat 151 and the second connecting seat 152 is located at the first protrusion 1510 and the second protrusion 1522. In this embodiment, the rider 14 pivots toward the front of the frame 1 relative to the front foot bar 11. The first protrusion 1510 and the second protrusion 1522 are located on the upper edges of the first and second extensions, respectively. When the frame is in the folded state, the rider 14 rotates about this pivot point and is folded above the front foot bar 11 (as shown in Figure 6).

Referring to Figures 1 and 8 together, in one embodiment, the frame 1 is further provided with a release mechanism 16. The release mechanism 16 is configured to release the locking joint 15 from locking the rider 14 and the front leg bar 11, thereby allowing the rider 14 and the front leg bar 11 to pivot relative to each other. Alternatively, the release mechanism 16 can be provided on the rider 14. The release mechanism 16 includes a release operating member 160 and a first connecting member 161. The release operating member 160 is operably connected to a locking member 162 via the first connecting member 161. Specifically, one end of the first connecting member 161 is connected to the release operating member 160, and the other end of the first connecting member 161 is connected to the locking member 162. The release operating member 160 drives the locking member 162 to an unlocked position via the first connecting member 161. It should be noted that the release mechanism 16 may also include a rivet connected to the release operating member 160 and passing through the rider 14. One end of the first connecting member 161 may be connected to the rivet to connect with the release operating member 160, and the rider 14 may be provided with an elongated slot for the rivet to slide through. Alternatively, one end of the first connecting member 161 may be directly connected to the release operating member 160, and the rider 14 may also be provided with an elongated slot for the first connecting member 161 to pass through and slide through. Alternatively, the release operating member 160 may have a connecting portion extending into the inner cavity of the rider 14, one end of the first connecting member 161 may be directly connected to the connecting portion, and the rider 14 may be provided with an elongated slot for the connecting portion to slide through. Specifically, the user pushes and pulls the release operating member 160 to drive the locking member 162 to the unlocked position, thereby releasing the locking joint 15 from locking the rider 14 and the front leg bar 11, allowing the rider 14 and the front leg bar 11 to pivot relative to each other, thereby allowing the frame 1 to switch from the deployed state to the collapsed state. Alternatively, as shown in FIG1 , the release operating member 160 may be disposed on the rider's hand 14 near the handle 142 for easier operation by the user. Those skilled in the art will appreciate that disposing the release operating member 160 on the rider's hand 14 near the handle 142 is merely an optional embodiment of the present invention. The release operating member 160 may also be disposed at other suitable locations depending on usage requirements, as long as the release operating member 160 can drive the locking member 162 to slide to the unlocked position.

Referring to FIG8 , in one embodiment, the release operating member 160 is a sliding push button that is mounted on the rider's hand 14 and can slide along the axial direction (i.e., the lengthwise direction) of the rider's hand 14. Alternatively, the release operating member 160 can be configured in other forms, such as a push button or a knob, as long as the release operating member 160 can drive the locking member 162 to slide to the unlocked position. In one embodiment, the first connecting member 161 is a steel wire that is disposed within the inner cavity of the rider's hand 14. Alternatively, the first connecting member 161 can be configured in other forms, such as a connecting rod, a connecting plate, a connecting block, etc., as long as the release operating member 160 can be operably connected to the locking member 162.

Referring to Figure 8, in one embodiment, the locking joint 15 further includes a first return member 163. The first return member 163 is fixed in the first connecting seat 151 and abuts the locking member 162. The first return member 163 is configured to cause the locking member 162 to have a tendency to slide to the locked position. Optionally, the first return member 163 is a spring disposed in the first connecting seat 151, one end of the spring being connected to the first connecting seat 151 (or to the rider 14), and the other end of the spring being connected to the locking member 162. The spring is configured to continuously apply pressure to the locking member 162, causing the locking member 162 to have a tendency to slide to the locked position. Alternatively, the first return member 163 may also be a return mechanism of other forms, such as a spring, a torsion spring, etc., as long as it can cause the locking member 162 to have a tendency to slide to the locked position.

3 , 7 , and 8 , in one embodiment, the rider 14 includes a push handle 142, an inner rod 140, and an outer rod 141. The upper end of the inner rod 140 is connected to the push handle 142, and the other end of the inner rod 140 is sleeved within the outer rod 141. The inner rod 140 can slide within the outer rod 141 to adjust the length and height of the rider 14. The frame 1 also includes a rider length adjustment mechanism 17 operatively connected to the inner rod 140 and the outer rod 141 to lock the relative position of the inner rod 140 and the outer rod 141 or to allow the inner rod 140 and the outer rod 141 to slide relative to each other.

In the embodiment shown in Figures 7 and 8, the rider length adjustment mechanism 17 includes an adjustment button 170; a second return member 171; an adjustment member 173; a third return member 175; and a second connecting member 172. The adjustment button 170 is disposed on the handle 142 and is slidable between an adjustment position and a fixed position. The second return member 171 abuts against the adjustment button 170 and is configured to cause the adjustment button 170 to slide to the fixed position. Optionally, the second return member 171 is a spring disposed within the handle 142, with one end of the spring connected to the handle 142 and the other end connected to one end of the adjustment button 170. The spring is configured to continuously apply pressure to the adjustment button 170, causing it to slide to the fixed position. Alternatively, the second return member 171 may be another type of return mechanism, such as a spring, a torsion spring, or the like, as long as it causes the adjustment button 170 to slide to the fixed position. The adjustment button 170 is drivably connected to one end of a second connecting member 172, the other end of which is connected to a driving member 174. When the adjustment button 170 is pressed toward the adjustment position, the adjustment button 170 pulls the second connecting member 172 toward the push handle 142 (upward), thereby pulling the driving member 174 via the second connecting member 172, causing the driving member 174 to slide along the inner rod 140 toward the push handle 142. In one embodiment, the second connecting member 172 is a steel wire. When the adjustment button 170 is pressed toward the adjustment position, the adjustment button 170 tensions the steel wire, thereby pulling the driving member 174, causing the driving member 174 to slide along the inner rod 140 toward the push handle 142. Alternatively, the second connecting member 172 may be another connecting member, such as a connecting rod, a connecting plate, a connecting block, etc., as long as the adjustment button 170 can be drivably connected to the driving member 174.

In one embodiment, an adjustment member 173 is disposed in the inner rod 140. The adjustment member 173 allows the inner rod 140 and the outer rod 141 to slide relative to each other, or the adjustment member 173 locks the relative position of the inner rod 140 and the outer rod 141. Specifically, the adjustment member 173 is fixed to the lower end of the inner rod 140 and is provided with a straight slot 1730. A locking member 1731 is disposed within the straight slot 1730 and is capable of sliding along the straight slot 1730. Optionally, the locking member 1731 is a locking pin. The outer rod 141 is provided with a plurality of locking holes 1410. When the locking member 1731 slides into the locking hole 1410, the inner rod 140 cannot slide in the outer rod 141. As a result, the adjusting member 173 locks the relative position of the inner rod 140 and the outer rod 141, thereby locking the length of the rider 14. When the locking member 1731 slides out of the locking hole 1410, the inner rod 140 is allowed to slide in the outer rod 141. As a result, the adjusting member 173 releases the lock on the relative position of the inner rod 140 and the outer rod 141, allowing the length of the rider 14 to be adjusted. A driving member 174 is provided in the inner rod 140. One end of the driving member 174 is connected to the second connecting member 172. The other end of the driving member 174 is provided with a driving inclined slot (not shown). A pin 1732 (e.g., a rivet) provided in the locking member 1731 passes through the driving inclined slot to connect the driving member 174 to the locking member 1731. When the user presses the adjustment button 170 to the adjustment position, the second connecting member 172 (such as a steel wire) pulls the driving member 174, causing the driving member 174 to slide along the inner rod 140 toward the push handle 142, and the driving inclined groove of the driving member 174 forces the locking member 1731 to slide along the straight groove 1730 toward the direction of exiting the locking hole 1410, thereby sliding the locking member 1731 out of the locking hole 1410, allowing the length of the rider 14 to be adjusted. When the rider 14 is adjusted to an appropriate length, the user releases the pressure on the adjustment button 170. Under the action of the second reset member 171, the adjustment button 170 returns to the fixed position from the adjustment position. At this time, the second connecting member 172 no longer applies a pulling force to the driving member 174. Under the action of the third reset member 175, the driving member 174 has a tendency to slide along the inner rod 140 in the direction away from the push handle 142. As a result, the driving inclined groove of the driving member 174 causes the locking member 1731 to have a movement tendency to slide along the straight groove 1730 in the direction of entering the locking hole 1410. At this time, if the corresponding end of the locking member 1731 is located at the position where the locking hole 1410 is located, the locking member 1731 will slide into the locking hole 1410, locking the length of the rider 14. If the corresponding end of the locking member 1731 is not located at the position where the locking hole 1410 is located, it is only necessary to slightly adjust the length of the rider so that the corresponding end of the locking member 1731 reaches the position where the nearest locking hole 1410 is located. After that, the locking member 1731 will automatically slide into the locking hole 1410, locking the length of the rider 14. It should be noted that the adjustment member 173 can be any structure known to those skilled in the art, and this application is not limited thereto.

In one embodiment, one end of the third return member 175 abuts the adjustment member 173, and the other end of the third return member 175 abuts the driving member 174. The third return member 175 is configured to cause the driving member 174 to slide away from the push handle 142. Optionally, the third return member 175 is a spring, with one end of the spring (such as the end of the third return member 175 near the push handle 142 in FIG8 ) abutting the adjustment member 173, and the other end of the spring (such as the end of the third return member 175 away from the push handle 142 in FIG8 ) abutting the driving member 174. The spring is configured to continuously apply pressure to the driving member 174, causing the driving member 174 to slide away from the push handle 142. Alternatively, the third return member 175 may be a return mechanism of other forms, such as a spring, a torsion spring, etc., as long as it can cause the driving member 174 to slide away from the push handle 142.

Referring to Figure 1 , in one embodiment, the vehicle frame 1 further includes a support frame 13. The support frame 13 is a generally rectangular structure. Optionally, the edges of the support frame 13, for example, the edges extending generally along the longitudinal direction L, may be recessed toward the interior of the support frame 13 to prevent interference with other components of the vehicle frame 1, as will be described in detail later. The support frame 13 is pivotally connected to a locking joint 15. Preferably, the middle portion of the support frame 13 is pivotally connected to the locking joint 15 to help reduce the longitudinal dimension (L) of the vehicle frame 1 in the collapsed state. Optionally, the support frame 13 may be provided with accessories such as a dining tray assembly 130, a sunshade assembly 131, and a seat securing mechanism 132. The dining tray assembly 130 can be used to place tableware (not shown); the sunshade assembly 131 can be used to install a sunshade (not shown); and the seat securing mechanism 132 can be used to connect to a device such as a bassinet or a safety seat (not shown). Furthermore, in this embodiment, the vehicle frame 1 further includes a linkage rod 18. One end of the linkage rod 18 is pivotally connected to the support frame 13, and the other end of the linkage rod 18 is pivotally connected to the rear leg rod 12. When the vehicle frame 1 is in the deployed state, the pivot point of the linkage rod 18 on the support frame 13 and the pivot point of the locking joint 15 on the support frame 13 are approximately the same height in the height direction H, and together they support the support frame 13, keeping the support frame 13 stable and non-pivotable. When the vehicle frame 1 switches from the deployed state to the collapsed state, the linkage rod 18 pivots toward the rear of the vehicle frame 1, and the rear leg rod 12 pivots toward the front of the vehicle frame 1, thereby gradually increasing the angle γ between the linkage rod 18 and the rear leg rod 12, as shown in Figures 3 to 5. The pivot point of the linkage rod 18 on the support frame 13 gradually lowers in the height direction H. Simultaneously, as the locking joint 15 gradually lowers in the height direction H, the pivot point of the locking joint 15 on the support frame 13 also gradually lowers in the height direction H. During this process, the rate of decrease in the height direction H of the locking joint 15 on the support frame 13 is greater than the rate of decrease in the height direction H of the linkage rod 18 on the support frame 13. As a result, the support frame 13 assumes an inclined posture with the front lower and the rear higher, as shown in Figures 3 to 5. Ultimately, in the height direction H, the support frame 13, the rider 14, the front leg rod 11, the rear leg rod 12, and the underframe 10 are tightly stacked together, thereby switching the frame 1 to the collapsed state, as shown in Figure 6. In this embodiment, the pivot point between the rear foot bar 12 and the rider 14 is located on the side of the rider 14 facing the inside of the frame 1, and the projection of the pivot trajectory of the rear foot bar 12 along the height direction H does not overlap with the projection of the pivot trajectory of the front foot bar 11 or the rider 14 along the height direction H. Therefore, in the folded state, the rear foot bar 12 and the front foot bar 11 are staggered with each other in the width direction W.

Referring to Figures 1 and 6 together, in one embodiment, the edges of the support frame 13 extending generally along the length direction L are recessed toward the interior of the support frame 13. The distance between the two edges of the chassis 10 extending generally along the length direction L gradually decreases from the front end to the rear end of the vehicle frame 1. In the deployed state of the vehicle frame 1, the projection of the support frame 13 in the height direction H falls within the projection of the chassis 10 in the height direction H. In other words, the distance between the two edges of the support frame 13 extending generally along the length direction L is no greater than the distance between the two edges of the chassis 10 extending generally along the length direction L. The projection of the rear leg lever 12 along the longitudinal direction L is generally S-shaped. Specifically, the upper portion of the rear leg lever 12 has a protruding portion 122 that projects outward from the frame 1. This protruding portion 122 is used to clear the support frame 13, allowing the upper end of the rear leg lever 12 to be pivotally connected to the rider 14. The lower portion of the rear leg lever 12 has a recessed portion 123 that is recessed toward the interior of the frame 1. This recessed portion 123 provides a pivot connection point for the linkage rod 18. When the frame 1 is switched between the deployed and collapsed positions, the recessed edge of the support frame 13, which extends generally along the longitudinal direction L, and the protruding portion 122 of the rear leg lever 12 provide space for the rear leg lever 12 to pivot, preventing interference between the support frame 13 and the rear leg lever 12.

In the embodiment shown in Figures 1 to 6 , the frame 1 further includes a front footrest 110 and a rear footrest 120. The front footrest 110 is connected to the base frame 10, and the front footbar 11 is pivotally connected to the front footrest 110. The rear footrest 120 is connected to the base frame 10, and the rear footbar 12 is pivotally connected to the rear footrest 120. In one embodiment, the frame 1 is also provided with a pull rod 19, which allows the user to pull the stroller. Optionally, the pull rod 19 is provided at the front of the base frame 10. Preferably, the pull rod 19 is pivotally provided at the middle of the second rod 103. Referring to Figures 1 and 3 , in one embodiment, the pull rod 19 can slide along a slide rail 196 provided at the bottom of the base frame 10 to a storage position at the bottom of the base frame 10. As shown in Figure 2 , the base frame 10 is tilted from front to back and from top to bottom. The slide rail 196 is also tilted to guide the pull rod 19 to slide to the storage position and facilitate the user's removal of the pull rod 19.

FIG9 shows a perspective view of a vehicle frame 1 in an expanded state according to one embodiment of the present application. FIG10 to FIG13 illustrate the process of switching the vehicle frame 1 shown in FIG9 from the expanded state to the collapsed state. The vehicle frame 1 in the embodiment shown in FIG9 is substantially structurally identical to the vehicle frame 1 in the embodiment shown in FIG1 , and only the differences between the two are described below.

9 , in this embodiment, a first curved portion 1001 is formed on the first rod 100, protruding toward the interior of the frame 1, to define a first escape space 10010. When the frame 1 is in the folded state, at least a portion of the front leg rod 11 is located within the first escape space 10010. Optionally, the first curved portion 1001 is positioned on the first rod 100 such that, when the frame 1 is in the folded state, at least half of the axial extension length of the front leg rod 11 can be located within the first escape space 10010 (as shown in FIG. 13 ). This makes the folded frame 1 more compact and further reduces the dimensions of the folded frame 1 in the length direction L and the height direction H.

Referring to Figures 9 and 13 , in this embodiment, the rear leg bar 12 is formed with a second curved portion 121 that protrudes toward the rear of the frame 1, thereby forming a second escape space 1210. When the frame 1 is in the collapsed state, at least a portion of the rider 14 is located within the second escape space 1210. Optionally, the second curved portion 121 is configured such that, during the transition of the frame 1 to the collapsed state, the locking joint 15 can be accommodated within the second escape space 1210, thereby preventing the rear leg bar 12 from restricting the rider 14 from pivoting relative to the front leg bar 11. When the frame 1 is fully collapsed, at least half of the rider 14's axial extension is located within the second escape space 1210 (as shown in Figure 13 ), with a portion of the rear leg bar 12 positioned above the rider 14. This makes the collapsed frame 1 more compact and further reduces its dimensions in the length L and height H directions.

9 and 13 , in this embodiment, one end of a linkage rod 18 is pivotally connected to the support frame 13, and the other end of the linkage rod 18 projects outward from the bicycle frame 1 in the width direction W to be pivotally connected to the front leg bar 11. The pivot point between the rear leg bar 12 and the rider 14 is located below the rider 14 in the height direction H, and the projection of the pivot path of the rear leg bar 12 along the height direction H at least partially overlaps with the projection of the pivot path of the front leg bar 11 and/or the rider 14 along the height direction H.

Referring to Figures 10 to 13 , when the bicycle frame 1 switches from the deployed state to the collapsed state, the rider 14 and the rear leg bar 12 pivot toward the front of the bicycle frame 1, while the front leg bar 11 pivots toward the rear of the bicycle frame 1. The first rod 100, the front leg bar 11, the rear leg bar 12, and the rider 14 no longer maintain a roughly triangular configuration. During the collapse process, the rider 14, the front leg bar 11, and the rear leg bar 12 gradually approach the base frame 10 until they are tightly stacked together in the height direction H. At this point, at least a portion of the front leg bar 11 is located within the first escape space 10010, and at least a portion of the rider 14 is located within the second escape space 1210. Thus, the bicycle frame 1 switches to the collapsed state, as shown in Figure 13 . Compared to the deployed state, the dimensions of the frame 1 in the folded state are significantly reduced in both the height H and length L, making it easier to store and accommodate, for example, in the trunk of a car. Furthermore, the significantly reduced size of the frame 1 makes it easier for the user to lift and carry the stroller. Furthermore, in this embodiment, the pivot point between the support frame 13 and the locking joint 15, or more precisely, the pivot point between the support frame 13 and the rider 14, is offset from the center of the support frame 13. Specifically, the pivot point between the support frame 13 and the rider 14 is offset toward the side of the support frame 13 that is away from the linkage rod 18. The linkage rod 18 is disposed between the support frame 13 and the front leg rod 11. When the frame 1 is in the deployed state, the pivot point of the linkage rod 18 on the support frame 13 and the pivot point of the locking joint 15 on the support frame 13 (or the pivot point of the rider 14 on the support frame 13) are approximately at the same height in the height direction H. Together, they support the support frame 13, maintaining a stable and non-pivotable position. When the frame 1 switches from the deployed state to the collapsed state, the linkage rod 18 pivots toward the front of the frame 1, and the pivot point of the linkage rod 18 on the support frame 13 gradually decreases in the height direction H. Simultaneously, as the rider 14 pivots toward the front of the frame 1, the pivot point of the locking joint 15 on the support frame 13 (or the pivot point of the rider 14 on the support frame 13) also gradually decreases in the height direction H. During this process, the speed at which the linkage rod 18 pivots on the support frame 13 descends in the height direction H is approximately the same as the speed at which the locking joint 15 pivots on the support frame 13 (or the rider 14 pivots on the support frame 13). Consequently, during the folding process, the support frame 13 barely pivots relative to a plane parallel to the length direction L and width direction W, and the support frame 13 remains approximately horizontal, as shown in Figures 10 to 12. Finally, in the height direction H, the support frame 13, rider 14, front leg rod 11, rear leg rod 12, and base frame 10 are tightly stacked together. The design of this embodiment provides at least the following beneficial effects:

1. Avoiding accidental pinching or collision of a part of the user's body, such as the hands or knees, due to the pivoting of the support frame 13;

2. When the support frame 13 is covered with a cloth cover, the support frame 13 and the cloth cover are lowered and folded in a roughly horizontal posture. Compared with the embodiment shown in Figure 1, the materials at different positions of the cloth cover can be compressed and folded more evenly, thereby being flatter after folding.

Continuing with Figure 9, in this embodiment, a second reinforcing rod 102 is disposed between the two first rods 100. This second reinforcing rod 102 is used to enhance the overall structural stability of the chassis 10. In particular, this second reinforcing rod 102 is used to increase the structural stability at the first curved portion 1001. Optionally, both ends of the second reinforcing rod 102 are respectively connected to the first curved portions 1001 of the two first rods 100. Optionally, the second reinforcing rod 102 is configured as an arc-shaped structure.

9 and 14 , in this embodiment, the adjustment button 170 is a push button mounted on the inner rod 140 and is slidable along the axial direction of the inner rod 140 between an adjustment position and a fixed position. When a user pushes or pulls the adjustment button 170, causing it to slide from the fixed position to the adjustment position, the adjustment button 170 drives the adjustment member 173 to slide to the adjustment position via the second connecting member 172, allowing the inner rod 140 and the outer rod 141 to slide relative to each other, thereby allowing the length and height of the rider 14 to be adjusted.

According to one embodiment of the present application, a cart is provided, which includes a frame 1 according to an embodiment of the present application and a cloth cover (not shown) mounted on a support frame 13. The support frame 13 and the cloth cover together form a storage space for the cart.

The following describes the folding process of the vehicle frame 1 according to an embodiment of the present application, taking the embodiment shown in FIG1 as an example. As shown in FIG1 and FIG2 , the vehicle frame 1 is in the unfolded state. When folding, first, the mechanism such as the sleeping cot or safety seat connected to the seat fixing mechanism 132 is removed, and the seat fixing mechanism 132 is adjusted to the storage position shown in FIG1 ; the pull rod 19 is pivoted and slid to the storage position; and the awning assembly 131 is adjusted to the storage position, as shown in FIG3 . Then, the user pushes and pulls the release operating member 160, such as a release button, and pushes the rider 14 to pivot toward the front of the vehicle frame 1, so that the rider 14 drives the rear leg rod 12 to pivot toward the front of the vehicle frame 1 and drives the front leg rod 11 to pivot toward the rear of the vehicle frame 1. When the rider 14 passes the vertical position (i.e., the position where the axial extension of the rider 14 is parallel to the height direction H), the user no longer needs to push the rider 14. The rider 14, the front leg bar 11, and the rear leg bar 12 gradually approach the base frame 10 under the action of gravity until the rider 14, the front leg bar 11, and the rear leg bar 12 are tightly stacked with the base frame 10 in the height direction H, and the frame 1 switches to the folded state, as shown in Figures 5 and 6. Finally, the user hooks the folding hook 1002 onto the connecting protrusion 143 to maintain the frame 1 in the folded state and prevent accidental deployment.

15 to 17 , an embodiment of the present application provides a cart comprising: a base frame 10 and a pull rod mechanism 2 connected to the base frame 10. The pull rod mechanism 2 comprises: a pull rod 19; a rotating portion 192; and a third connecting seat 194. One end of the pull rod 19 is connected to the rotating portion 192, and the rotating portion 192 is connected to the third connecting seat 194 and is capable of pivoting between a first pivot position and a second pivot position. With reference to the base frame 10 or the rotating portion 192, when the pull rod 19 is in the first pivot position, the pull rod 19 is at a first angle, and when the pull rod 19 is in the second pivot position, the pull rod 19 is at a second angle. In other words, the pull rod 19 can pivot between a first angle and a second angle relative to the base frame 10 (or the third connecting seat 194). Specifically, when the rotating portion 192 pivots to the first pivot position, the pull rod 19 pivots to the upright position, as shown in FIG15 ; when the rotating portion 192 pivots to the second pivot position, the pull rod 19 pivots to the lying position, as shown in FIG17 . When the user pulls the stroller using the pull rod 19, the pull rod 19 and the rotating portion 192 pivot to a position that matches the user's height and arm length, for example, the position of the pull rod 19 in FIG16 , making it easier for the user to use the stroller.

As shown in FIG18 , in one embodiment, the pull rod 19 includes a handle 190 and a connecting rod 191. The handle 190 is configured as a generally annular structure for easy gripping by the user. It should be noted that the generally annular structure is only one optional embodiment of the handle structure. Those skilled in the art may select other handle structures, such as polygonal, straight, T-shaped, or cross-shaped, based on their specific needs. This application does not limit this practice, as long as the handle meets the user's grip requirements. In the embodiment shown in FIG18 , the handle 19 includes a mounting portion 1902 and a grip 1901 for the user to grip. One end of the mounting portion 1902 is connected to one end of the connecting rod 191, while the other end of the mounting portion 1902 is connected to the handle 1901. Alternatively, the handle 1901 may be configured as a generally C-shaped structure, and the mounting portion 1902 may be configured as a generally T-shaped structure, with the two ends of the C-shaped handle 1901 connected to the two ends of the T-shaped mounting portion 1902, and the other end of the T-shaped mounting portion 1902 connected to one end of the connecting rod 191. Optionally, mounting portion 1902 and handle 1901 are integrally formed. Optionally, handle 1901 is made of a non-slip material such as rubber or plastic. Preferably, handle 1901 has a non-slip surface, such as anti-slip lines or bumps. The other end of connecting rod 191 is connected to rotating portion 192. Optionally, mounting portion 1902, handle 1901, and connecting rod 191 are integrally formed.

Referring to Figures 19, 20, and 23, in one embodiment, the rotating portion 192 includes a main body 1921 and a connecting end 1922. The main body 1921 is configured as a generally cylindrical structure and is pivotable about the cylindrical axis. It should be noted that the generally cylindrical structure is merely one optional embodiment of the present application. Those skilled in the art may select other suitable shapes for the main body of the rotating portion, such as a cube or a polyhedron, based on practical needs, and this application is not limited thereto. The connecting end 1922 is configured as a boss protruding from the cylindrical surface of the main body 1921. The boss is provided with a first connecting hole 19220, into which the other end of the connecting rod 191 is inserted. The interior of the main body 1921 is provided with a receiving cavity 19221 that communicates with the first connecting hole 19220. Furthermore, each end surface of the main body 1921 is provided with a second pivot hole 1924 that communicates with the receiving cavity 19221. The other end of the connecting rod 191 passes through the first connecting hole 19220 to be received in the receiving cavity 19221 , and the other end of the connecting rod 191 is provided with a first pivot hole 1910 penetrating the connecting rod 191 .

Referring to Figures 19 to 21 and 23, in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivot space 1944. Pivot space 1944 is configured to be substantially cylindrical, matching the shape of the main body 1921 of the rotating portion 192. The main body 1921 of the rotating portion 192 is pivotally disposed within pivot space 1944. It should be noted that the substantially cylindrical structure is merely one optional embodiment of the present application. Those skilled in the art may select other suitable shapes for the pivot space of the connecting seat, such as a cube or polyhedron, as long as they allow the main body 1921 of the rotating portion 192 to pivot within pivot space 1944. This is not a limitation of the present application. The sidewalls of pivot space 1944 are provided with a fourth pivot hole 1943 that communicates with pivot space 1944.

With reference to Figures 19 and 20, in one embodiment, a first positioning member 193 is disposed between the third connecting seat 194 and the rotating portion 192. The first positioning member 193 allows the pull rod 19 to be positioned at multiple different pivot angles relative to the third connecting seat 194. It will be appreciated that the first positioning member 193 acts as a limiter for the pull rod 19, allowing the pull rod 19 to have multiple different positioning angles relative to the third connecting seat 194. The first positioning member 193 is configured to limit the pivoting of the rotating portion 192. Specifically, the first positioning member 193 is located between the inner surface of the side wall of the pivot space 1944 of the third connecting seat 194 and the end surface of the main body 1921 of the rotating portion 192. Optionally, the first positioning member 193 is a damping plate 1931, the thickness of which is slightly greater than the gap between the inner surface of the side wall of the pivoting space 1944 (i.e., the inner wall of the pivoting space 1944) and the end face of the main body 1921 (i.e., the side wall surface of the main body 1921 facing the inner wall of the pivoting space 1944). As a result, the damping plate 1931 is clamped between the inner surface of the side wall of the pivoting space 1944 and the end face of the main body 1921. When the rotating portion 192 has a tendency to pivot relative to the third connecting seat 194, static friction forces exist between the damping plate 1931 and the side wall of the pivoting space 1944, as well as between the damping plate 1931 and the end face of the main body 1921. The combined force of these static friction forces prevents the rotating portion 192 from pivoting relative to the third connecting seat 194. In this embodiment, the clamping force (pressure) exerted by the inner surface of the sidewall of pivot space 1944 and the end surface of main body 1921 on damping plate 1931 is set so that the torque resulting from the combined static friction of damping plate 1931 acting on the sidewall of pivot space 1944 and the end surface of main body 1921 generated by this clamping force (pressure) is no less than the torque resulting from the weight of pull rod 19 and rotating portion 192. Thus, when the user does not apply any external force to pull rod mechanism 2, pull rod 19 and rotating portion 192 remain in their original positions without pivoting. This design allows pull rod 19 to be retained in any operating position (e.g., the position of pull rod 19 in FIG. 16 ). Consequently, when the user releases their grip on pull rod 19, pull rod 19 will not suddenly pivot or fall toward the support surface under its own weight, improving the safety of stroller use and making it easier for the user to re-grip pull rod 19. Furthermore, when the user applies a pulling force or a pushing force to the pull rod 19, if the total torque causing the pull rod 19 and the rotating portion 192 to have a pivoting tendency is greater than the torque caused by the combined force of the static friction of the damping plate 1931 acting on the side wall of the pivoting space 1944 and the end face of the main body 1921 that can be generated by the clamping force (pressure), the pull rod 19 and the rotating portion 192 will pivot. Through this design, the adjustment and positioning of the use position of the pull rod 19 is achieved, and the user can adjust the pull rod 19 to any position between the first pivot position and the second pivot position, realizing stepless adjustment of the use angle of the pull rod 19, which has a wider applicability.

In one embodiment, damping sheet 1931 is optionally a flexible component. Optionally, the material of damping sheet 1931 includes at least one of the following: a soft colloid; a rubber material; and a plastic material. Optionally, the material of damping sheet 1931 may include HYTREL material.

20 and 23 , in one embodiment, a damping plate 1931 is disposed between each end surface of the main body 1921 and the sidewall of the pivot space 1944. A third pivot hole 19310 is disposed on the damping plate 1931. When the connecting rod 191, the rotating portion 192, the damping plate 1931, and the third connecting seat 194 are assembled together, the pivot pin 195 is sequentially passed through the fourth pivot hole 1943, the third pivot hole 19310, the second pivot hole 1924, and the first pivot hole 1910. This achieves the pivotable connection between the connecting rod 191 and the rotating portion 192 and the positioning of the damping plate 1931 (preventing the damping plate 1931 from sliding out of the gap between the inner surface of the sidewall of the pivot space 1944 and the end surface of the main body 1921). Optionally, the inner diameter of the first connecting hole 19220 is slightly smaller than the outer diameter of the connecting rod 191 to prevent the connecting rod 191 from shaking in the first connecting hole 19220 .

Referring to FIG. 23 , in one embodiment, a limiting protrusion 1923 is provided on the outer surface of the main body 1921 of the rotating portion 192, and a limiting groove 19440 is provided on the inner wall of the pivoting space 1944 of the third connecting seat 194. When the rotating portion 192 pivots, the limiting protrusion 1923 slides within the limiting groove 19440. When the rotating portion 192 pivots from the first pivot position to the second pivot position, that is, when the pull rod 19 pivots from the upright position to the lying position, the limiting protrusion 1923 abuts against the sidewall of the limiting groove 19440 to limit further pivoting of the rotating portion 192. By providing the limiting protrusion 1923 and limiting groove 19440, the rotation range of the pull rod 19 can be limited, ensuring that the pull rod 19 maintains a certain distance from the supporting surface of the cart (e.g., the ground) when in the lying position. This prevents the pull rod 19 from contacting the supporting surface (e.g., the ground) due to "overly lying down" and causing the handle 190 to become dirty or worn. It also facilitates the user's grip on the pull rod 19 in the lying position, providing convenience and practicality. It should be noted that although in this embodiment, the limiting protrusion 1923 is provided on the main body 1921 of the rotating portion 192 and the limiting groove 19440 is provided in the inner wall of the pivot space 1944 of the third connecting seat 194, this is merely an optional embodiment. Those skilled in the art may adjust the location of the limiting protrusion and limiting groove according to actual needs, as long as the pivoting of the rotating portion is limited to prevent "overly lying down." For example, the limiting protrusion may be provided on the inner wall of the pivot space of the third connecting seat, while the limiting groove may be provided in the main body of the rotating portion.

21 and 22 , in one embodiment, a first through hole 1941 is provided at one end of the third connecting seat 194 opposite to the pivot space 1944, and the first through hole 1941 is slidably mounted on the slide rail 196. The third connecting seat 194 is capable of sliding along the slide rail 196 between a first sliding position and a second sliding position. When the third connecting seat 194 slides to the first sliding position, the pull rod 19 slides to the extended position, as shown in FIG21 ; when the third connecting seat 194 slides to the second sliding position, the pull rod 19 slides to the storage position, as shown in FIG22 . Thus, when the user does not need to use the pull rod 19 or needs to fold the cart, the pull rod 19 can be slid to the storage position to prevent the pull rod 19 from affecting the user's operation and facilitate folding the cart.

Referring to Figures 21 and 23, in one embodiment, a second through-hole 1942 is provided on the sidewall of the first through-hole 1941. A second positioning hole 1961 is provided in the portion of the slide rail 196 corresponding to the first sliding position of the third connecting seat 194. A second positioning member 1960 is disposed within the slide rail 196. At least a portion of the second positioning member 1960 is slidable within the second positioning hole 1961, retracting and protruding from the second positioning hole 1961. When the third connecting seat 194 slides to the first sliding position, at least a portion of the second positioning member 1960 protrudes from the second positioning hole 1961 and enters the second through-hole 1942, locking the third connecting seat 194 in the first sliding position. This prevents the third connecting seat 194 from sliding toward the second sliding position and maintains the pull rod 19 in the extended position. Optionally, the second positioning member 1960 is a spring having a first protrusion 19601 that is slidable within the second positioning hole 1961.

22 and 24 , in one embodiment, a portion of the slide rail 196 corresponding to the second sliding position of the third connector 194 is provided with a third positioning hole 1963. A third positioning member 1962 is provided within the slide rail 196. At least a portion of the third positioning member 1962 is slidable within the third positioning hole 1963 to retract and protrude from the third positioning hole 1963. When the third connector 194 slides to the second sliding position, at least a portion of the third positioning member 1962 protrudes from the third positioning hole 1963 and enters the second through-hole 1942, locking the third connector 194 in the second sliding position. This prevents the third connector 194 from sliding unintentionally toward the first sliding position, facilitating maintenance of the pull rod 19 in the stowed position. For example, when the pull rod 19 is in the stowed position, even if the cart is supported on an inclined surface or an external force suddenly impacts the rear of the cart, the third connector 194 remains locked in the second sliding position, reducing the risk of the pull rod 19 accidentally extending. Optionally, the third positioning member 1962 is a spring sheet having a second protruding column 19621 , and the second protruding column 19621 is slidable in the third positioning hole 1963 .

Referring to Figures 20, 21, and 22, in one embodiment, the drawbar mechanism 2 further includes a fixed portion 198, to which the slide rail 196 is connected. When the rotating portion 192 pivots from the second pivot position to the first pivot position, the drawbar 19 abuts against the front surface of the fixed portion 198 to restrict further pivoting of the rotating portion 192. In this embodiment, the drawbar mechanism 2 includes a front rod 1031 and a rear rod 1032, each of which is connected to the base frame 10. Optionally, as shown in Figure 20, the base frame 10 includes two first rods 100 extending along the length direction L of the stroller and two second rods 103 extending along the width direction W of the stroller. The front rod 1031 and the rear rod 1032 are respectively the two second rods 103 of the base frame 10. The front rod 1031 and the rear rod 1032 are each fixed to a fixed portion 198, and the ends of the slide rail 196 are respectively connected to the two fixed portions 198. When the rotating portion 192 pivots from the second pivot position to the first pivot position, the pull rod 19 abuts against the front surface of the fixed portion 198 fixed to the front rod 1031, thereby restricting the rotating portion 192 from further pivoting. For ease of description, this application uses terms indicating relative positions, such as "up," "down," "front," and "rear." These terms are based on the directions shown in FIG15 . Specifically, in FIG15 , "up" refers to the direction relative to the top, "down" refers to the direction relative to the bottom, "front" refers to the direction relative to the left, and "rear" refers to the direction relative to the right.

19 and 22 , in one embodiment, the pull rod mechanism 2 further includes at least one receiving member 197, which is disposed on the front rod 1031 and has a receiving slot 1970 disposed therein. When the pull rod 19 slides to the storage position, at least a portion of the pull rod 19 is received in the receiving slot 1970. In this embodiment, the receiving member 197 is hook-shaped, but this is merely exemplary. In other embodiments, the receiving member 197 may also be configured as other suitable shapes, and this application is not limited thereto. Optionally, when the pull rod 19 slides to the storage position, the handle 190 of the pull rod 19 is received in the receiving slot 1970. Optionally, the pull rod mechanism 2 includes two receiving members 197, the two receiving members 197 being separated by a fixing portion 198 disposed on the front rod 1031, with the openings of the receiving slots 1970 of the two receiving members 197 being disposed opposite each other. When the pull rod 19 slides to the storage position, at least a portion of the pull rod 19 , such as the handle 190 , is stored in the two storage slots 1970 .

Referring again to Figure 17 , in one embodiment, a certain angle α is formed between the extension direction D2 of the slide rail 196 and the plane D1 of the support surface. Furthermore, when the pull rod 19 is in the lying position, the extension direction of the pull rod 19 is substantially parallel to the extension direction D2 of the slide rail 196. This design, on the one hand, allows the handle 190 to be positioned a certain distance from the support surface when the pull rod 19 is in the lying position, making it easier for the user to re-grip the handle 190. On the other hand, the angle α makes the pulling and pushing movements of the pull rod 19 more ergonomic, making the operation more comfortable for the user.

The working principle of the pull rod mechanism 2 according to the embodiment of the present application is explained below by taking the embodiment shown in Figures 15 to 24 as an example.

As shown in Figure 22, the pull rod 19 is in the stowed position, housed beneath the cart's chassis 10. At this point, the second boss 19621 passes through the third positioning hole 1963 and enters the second through-hole 1942. Referring to Figure 24, the third connecting seat 194 is maintained in the second sliding position, i.e., the pull rod 19 is held in the stowed position. Without external force pulling out the pull rod 19, the pull rod 19 will not move out of the stowed position. In this position, the pull rod 19 has minimal impact on the cart's overall size and does not affect the cart's folding operation.

When the user needs to use pull rod 19 to pull the cart, they grasp handle 190 of pull rod 19 and apply a pulling force toward the front of the cart. When the pulling force is sufficient to overcome the elastic force of the spring, second protrusion 19621 exits second through-hole 1942, thereby releasing the grip on third connecting seat 194. Continued application of the pulling force pulls pull rod 19 from the stored position to the extended position, as shown in FIG17 . Because the angle α between slide rail 196 and the supporting surface is present, this pulling operation meets ergonomic standards and is therefore relatively comfortable for the user.

When the pull rod 19 reaches the extended position, the first boss 19601 passes through the second positioning hole 1961 and enters the second through hole 1942 (refer to Figure 23), keeping the third connecting seat 194 in the first sliding position, that is, keeping the pull rod 19 in the extended position. In the absence of external force, the pull rod 19 will not move out of the extended position. At this time, the user continues to apply a pulling force to the pull rod 19 to pull the cart. During this process, based on the user's height and arm length, the rotating portion 192 and the pull rod 19 will pivot to a use position suitable for the user (for example, the position of the pull rod 19 in Figure 16).

During the process of pulling the stroller, if the user stops pulling and releases the pull rod 19, the pull rod 19 will remain in the position at which the user released the pull rod 19 due to the action of the first positioning member 193 (e.g., the damping plate 1931). The pull rod 19 will not automatically pivot toward the supporting surface due to its own gravity. The user can re-grip the pull rod 19 from the position at which the user released the pull rod 19 to continue pulling the stroller.

To pivot the pull rod 19 to the upright position (as shown in FIG. 15 ), simply apply a force to the pull rod 19, causing it to pivot to the upright position. At this point, the pull rod 19 abuts against the front surface of the fixing portion 198 of the front rod 1031 and is unable to pivot further. This prevents the pull rod 19 from interfering with other components of the stroller during transitional pivoting, prevents it from squeezing items stored in the stroller, and prevents it from accidentally injuring a child in a baby carrier.

After using the pull rod 19, the user can pivot the pull rod 19 to the lying position and push the pull rod 19 toward the rear of the cart. When the applied thrust is sufficient to overcome the elastic force of the shrapnel, the first boss 19601 exits the second through hole 1942, thereby releasing the hold on the third connecting seat 194. Continue applying thrust to push the pull rod 19 from the extended position to the storage position, as shown in FIG22. At this time, the second boss 19621 passes through the third positioning hole 1963 and enters the second through hole 1942 (see FIG24), maintaining the third connecting seat 194 in the second sliding position, that is, maintaining the pull rod 19 in the storage position. In the absence of external force, the pull rod 19 will not move out of the storage position. As the pull rod 19 enters the storage position, the handle 190 enters the storage slot 1970.

25 to 29 show other embodiments according to the present application, which are substantially identical in structure to the pull rod mechanism 2 in the aforementioned embodiment, and only the differences between the two are described below.

25 and 26 , in one embodiment, the pull rod mechanism 2 includes a receiving member 197 disposed on the underside of a fixing portion 198 fixed to the front rod 1031, with a receiving slot 1970 of the receiving member 197 opening toward the front of the fixing portion 198. Optionally, the receiving member 197 is integrally formed with the fixing portion 198. When the pull rod 19 slides to the storage position, at least a portion of the pull rod 19, such as the handle 190, enters and is stored in the receiving slot 1970. In this embodiment, the opening of the receiving slot 1970 faces forward, making it easier for the user to remove and place the handle 190 in the receiving slot 1970. In this embodiment, a portion of the handle 190 is housed in the receiving slot 1970, and the user can grasp the front end of the handle 190 to pull the pull rod 190 out to the extended position.

28 and 29 , in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivot space 1944, in which at least a portion of the rotating portion 192 is accommodated. The inner surface of at least one side wall of the pivot space faces at least one surface of the rotating portion. At least one elastic finger 199 is provided on one of the surfaces of the rotating portion 192 and the side wall of the pivot space that are opposite to each other. A plurality of positioning recesses 1932 are provided on the other of the surfaces of the rotating portion 192 and the side wall of the pivot space that are opposite to each other. A positioning protrusion 1945 is provided on the side of the elastic finger 199 that faces the positioning recess 1932, and the positioning protrusion 1945 can engage with one of the positioning recesses 1932 to position the pull rod 19 at one of the multiple pivot angles.

Continuing with reference to Figures 28 and 29, in one embodiment, the first positioning member 193 includes a positioning recess 1932 and a positioning protrusion 1945 that are shaped to fit together. To clearly illustrate the structure of the positioning recess 1932 and the positioning protrusion 1945, a portion of the inner wall of the pivot space 1944 has been removed in Figure 29. In the embodiment shown in Figure 29, at least one positioning recess 1932 is disposed in the end surface of the main body 1921 of the rotating portion 192, and at least one positioning protrusion 1945 is disposed on the inner wall of the pivot space 1944 (the inner surface of the sidewall of the pivot space). As the rotating portion 192 pivots, when the positioning protrusion 1945 enters the positioning recess 1932, the shaped fit between the positioning protrusion 1945 and the positioning protrusion 1945 restrains the positioning recess 1932, thereby limiting further pivoting of the rotating portion 192 and maintaining the pull rod 19 in its corresponding operating position. Optionally, the positioning recesses 1932 and the positioning protrusions 1945 may also be arranged in opposite positions, that is, at least one positioning recess 1932 is arranged on the inner wall of the pivot space 1944, and at least one positioning protrusion 1945 is arranged in the end surface of the main body 1921 of the rotating portion 192. Optionally, more than one positioning recess 1932 is provided to achieve maintaining the pull rod 19 in more than one working position. Preferably, two groups of positioning recesses 1932 are provided, each group of positioning recesses 1932 includes more than one positioning recess 1932, and two positioning protrusions 1945 are provided, and the two positioning protrusions 1945 respectively cooperate with one group of positioning recesses 1932. More preferably, each group of positioning recesses 1932 includes four positioning recesses 1932 to achieve maintaining the pull rod 19 in four different working positions, as shown in Figure 29. In other embodiments, the number of positioning protrusions 1945 on each inner wall of the pivoting space 1944 is not limited to two. For example, the number of positioning protrusions 1945 on each inner wall of the pivoting space 1944 may be one, three, or four. Furthermore, the number of positioning recesses 1932 included in each group of positioning recesses 1932 is not limited to four. It may be any number greater than two, and may be set according to the desired adjustment position, such as three or five.

The embodiment shown in Figures 25 to 29 operates in a substantially similar manner to the aforementioned embodiment, with the difference being that, during the process of pulling the stroller, if the user stops pulling and releases their grip on the pull rod 19, if the positioning protrusion 1945 of the first positioning member 193 is located in the positioning recess 1932, the pull rod 19 will remain in the position in which the user released the pull rod 19. If the positioning protrusion 1945 of the first positioning member 193 is not engaged with the positioning recess 1932, the pull rod 19 will pivot slightly toward the support surface due to its own weight until the positioning protrusion 1945 enters and engages with the positioning recess 1932. The pull rod 19 will then remain in the position in which the positioning protrusion 1945 entered and engaged with the positioning recess 1932. In this embodiment, the pull rod 19 can remain in the use position or a position close to the use position, thus avoiding the risk of the pull rod 19 pivoting against the support surface due to its own weight and injuring the user.

Referring to Figures 30 to 33 , an embodiment of the present application provides a seat securing mechanism 132 comprising a fixing base 133 and an engaging base 134. The engaging base 134 is slidably connected to the fixing base 133 and is capable of movement, e.g., sliding, between a stowed position and a deployed position. The engaging base 134 is further away from the fixing base 133 when in the deployed position than when in the stowed position. In this embodiment, the engaging base 134 is also configured to pivot relative to the fixing base 133. When the engaging base 134 moves between the deployed and stowed positions, the engaging base 134 undergoes an angular deflection relative to the fixing base 133. Of course, the pivotability of the engaging base 134 relative to the fixing base 133 is merely an optional embodiment of the present application. In other embodiments, the engaging base 134 may also be configured to be non-pivotable relative to the fixing base 133, with the engaging base 134 only undergoing translational movement between the deployed and stowed positions.

Specifically, in this embodiment, the stroller includes a support frame 13, and a seat fixing mechanism 132 is connected to each of the two side rods (i.e., rods extending generally along the length direction L) of the support frame 13, as shown in Figure 30. For ease of description, the following description only focuses on one of the seat fixing mechanisms 132. Those skilled in the art should understand that the seat fixing mechanisms 132 provided on both side rods have the same structure and pivot simultaneously between a folded position and an extended position. It should be noted that in actual use, the engaging seats 134 provided on both side rods pivot simultaneously between a folded position and an extended position. This is intended to facilitate the folding operation of the stroller and to connect the seat 135. Referring to Figures 36 and 37, this is required in actual use scenarios, but this does not mean that the two engaging seats 134 cannot pivot independently.

Continuing to refer to Figures 30 to 33, in one embodiment, the engaging seat 134 includes: a coupling portion 1346 and a base 1349. The coupling portion 1346 is configured to be inserted into a coupling groove (not shown) of the seat 135, and the base 1349 is connected to the coupling portion 1346 and is pivotally connected to the fixed seat 133. Optionally, the coupling portion 1346 and the base 1349 are integrally formed. Optionally, referring to Figure 33, there is an arc-shaped transition area between the coupling portion 1346 and the base 1349, and the width of the coupling portion 1346 is smaller than the width of the base 1349 to adapt to the shape of the side wall of the seat 135. It should be noted that the width direction of the coupling portion 1346 is also the width direction W of the cart in Figure 30 (the left and right direction of the paper in Figure 33) as the width direction of the coupling portion 1346.

Referring to Figures 32 to 35, in one embodiment, when the snap-fitting seat 134 is in the folded position, the spacing between the engagement portions 1346 of the two snap-fitting seats 134 is L1, and the spacing between the base portions 1349 of the two snap-fitting seats 134 is L2, with reference to Figure 34. Optionally, L1 can range from 323.46mm≤L1≤395.34mm, for example, L1 is approximately 359.4mm; L2 can range from 293.4mm≤L2≤358.6mm, for example, L2 is approximately 326mm. Those skilled in the art will appreciate that the spacing between the two side rods of the support frame 13 can be changed according to actual needs to change the size of L1 and L2. When the snap-fitting seat 134 is in the expanded position, the spacing between the engagement portions 1346 of the two snap-fitting seats 134 is L1', and the spacing between the base portions 1349 of the two snap-fitting seats 134 is L2', with reference to Figure 35. Optionally, the range of L1’ can be 301.86mm≤L1’≤368.94mm, and L1’ is, for example, approximately 335.4mm; L2’ is, for example, approximately 302mm. Those skilled in the art will appreciate that, in actual use, the appropriate size of L1’ can be selected based on the spacing between the two engagement grooves of the seat 135 to be fixed. When pivoting from the deployed position to the folded position, the spacing between the two engaging seats 134 increases by ΔL (i.e., L1-L1’) or ΔL (i.e., L2-L2’), for example, ΔL is approximately 24mm, for comparison with Figures 32 and 33. There is a larger distance between the two locking seats 134 in the folded position, so that the seat fixing mechanism 132 encroaches less on the space between the two side rods of the support frame 13. On the one hand, this helps to reduce the interference of the locking seats 134 on other parts of the stroller when the stroller is folded. On the other hand, the seat 135 may not be needed during the use of the stroller. The increased distance between the two locking seats 134 in the folded position helps to reduce the interference of the locking seats 134 on the user's operations, such as reducing the interference and obstruction of the locking seats 134 on the activities of children sitting in the compartment formed by the support frame 13 and the cloth cover, or reducing the interference and obstruction of the locking seats 134 on the user's operations.

Figures 36 and 37 show a stroller with seat 135 attached. Alternatively, seat 135 can be a carrier suitable for younger infants or a seat that can be attached to a stroller. Alternatively, seat 135 can be replaced with other accessories, such as a storage basket. Before installing seat 135, any accessories already installed on the stroller that might interfere with seat 135, such as the dining tray assembly 130, should be removed.

Referring to Figures 38 to 41, in one embodiment, the upper end of the joint 1346 is provided with a first latching hole 1347 and/or the lower end of the base 1349 is provided with a second latching hole 1348. The first latching hole 1347 is used to engage with the rod in the engagement groove of the seat 135 to stably fix the seat 135 installed on the cart and prevent it from shaking. Of course, in other embodiments, the first latching hole 1347 may not be provided at the upper end of the joint 1346, and the rod may not be provided in the engagement groove of the seat 135. The second latching hole 1348 is used to cooperate with the engaging protrusion of the seat 135 to make the fixation of the seat 135 more stable.

Continuing with reference to Figures 38 to 41, in one embodiment, the fixing seat 133 is provided with a connecting end 1333, and the engaging seat 134 is provided with a third connecting slot 1342. The connecting end 1333 is inserted into the third connecting slot 1342 to pivotally connect the fixing seat 133 and the engaging seat 134. The connecting end 1333 is formed with two opposing first protrusions 13331 and two opposing first recesses 13332 at one end facing the engaging seat 134. The two first protrusions 13331 are separated by two first recesses 13332, and a first inclined surface 13333 is provided between adjacent first protrusions 13331 and first recesses 13332. The bottom wall of the third connecting groove 1342 is formed with two opposing second protrusions 13421 and two opposing second recesses 13422. The two second protrusions 13421 are separated by two second recesses 13422, and a second inclined surface 13423 is provided between adjacent second protrusions 13421 and second recesses 13422. When the engaging seat 134 is in the retracted position, the two second protrusions 13421 respectively engage with the two first recesses 13331, and the two first protrusions 13331 respectively engage with the two second recesses 13422. When the engaging seat 134 pivots from the retracted position to the deployed position, the first protrusion 13331 disengages from the second recesses 13422. The abutment between the second inclined surface 13423 and the first inclined surface 13333 causes the first protrusion 13331 to slide into contact with the second protrusion 13421, and the engaging seat 134 slides away from the fixed seat 133.

Referring to Figures 39 to 41, in one embodiment, the fixing seat 133 is provided with a mounting groove 1334. The mounting groove 1334 accommodates the side rods of the support frame 13. The mounting groove 1334 is fixed to the corresponding side rod by fixing members, such as rivets, screws, or bolts and nuts, thereby achieving the connection between the fixing seat 133 and the side rods. In one embodiment, the engaging seat 134 is provided with a mounting through hole 1340. The mounting through hole 1340 is provided with an end cap 1335 and a first elastic member 1331. The end cap 1335 is connected to the fixing seat 133. One end of the first elastic member 1331 abuts the end wall of the mounting through hole 1340, and the other end of the first elastic member 1331 abuts the end cap 1335. The first elastic member 1331 continuously applies pressure to the engaging seat 134, causing the engaging seat 134 to have a tendency to slide toward the fixing seat 133. Optionally, the first elastic member 1331 may be a spring, a spring, a torsion spring, etc., as long as it can continuously apply pressure to the engaging seat 134 .

Referring to Figures 40 to 41, a first connecting shaft 13334 is provided in the cavity of the connecting end 1333 of the fixing seat 133, and a protrusion 13424 is also provided in the third connecting groove 1342 of the snap-fit seat 134. Two opposite second protrusions 13421 and two opposite second recesses 13422 are located around the protrusion 13424, and the protrusion 13424 has a matching hole 13425. The first connecting shaft 13334 is inserted into the matching hole 13425, and the snap-fit seat 134 can pivot relative to the fixing seat 133 around the axial direction of the matching hole 13425. One of the outer edge of the first connecting shaft 13334 and the inner edge of the matching hole 13425 is provided with a limiting rib 13335, and the other of the outer edge of the first connecting shaft 13334 and the inner edge of the matching hole 13425 is provided with a limiting groove 13426. The limiting groove 13426 cooperates with the limiting rib 13335 to limit the rotation range of the snap-fit seat 134 relative to the fixed seat 133, thereby avoiding excessive rotation of the snap-fit seat 134.

In the present embodiment shown in Figures 40 and 41, the limiting rib 13335 is arranged on the first connecting shaft 13334, and the limiting groove 13426 is arranged in the matching hole 13425. The angle between the two circumferential ends of the limiting groove 13426 is approximately 90°. Thus, the cooperation between the limiting groove 13426 and the limiting rib 13335 allows the locking seat 134 to rotate approximately 90° so as to rotate between the expanded position and the folded position. Specifically, when the locking seat 134 is in the folded position (for example, as shown in Figure 30), the limiting rib 13335 abuts against one end of the limiting groove 13426, thereby limiting the rotation of the locking seat 134 in the counterclockwise direction (refer to direction D3 in Figure 30), and the locking seat 134 can only rotate in the clockwise direction (refer to direction D4 in Figure 30); the locking seat 134 is rotated approximately 90° in the clockwise direction, and the locking seat 134 reaches the expanded position shown in Figure 41. At this time, the limiting rib 13335 abuts against the other end of the limiting groove 13426, thereby limiting the locking seat 134 from continuing to rotate in the clockwise direction (refer to direction D4 in Figure 31), and the locking seat 134 can only rotate in the counterclockwise direction (refer to direction D3 in Figure 31) to return to the folded position. Those skilled in the art will understand that the rotation range of approximately 90° in this embodiment is merely exemplary, and those skilled in the art may set other suitable rotation ranges as needed. For example, the angle between the two circumferential ends of the limiting groove 13426 may be set to approximately 180°, so that when the locking seat 134 reaches the deployed position shown in FIG41 , the locking seat 134 rotates again approximately 90° in the clockwise direction (refer to direction D4 in FIG31 ) to move from the deployed position to another retracted position.

Continuing to refer to Figures 39 to 41, in one embodiment, the end cover 1335 has a second connecting shaft 13351 extending toward the fixing seat 133, and the end cover 1335 can be connected to the fixing seat 133 by passing through the first connecting shaft 13334 and the second connecting shaft 13351 through fasteners such as rivets (not shown).

40 and 41 , the connecting end 1333 is provided with a locking hole 1332. The engaging seat 134 includes a mounting cavity 1343 and a release operating member 1341 slidably disposed within the mounting cavity 1343. The release operating member 1341 includes a locking portion 13411 and a pressing portion 13413. When the engaging seat 134 pivots to the deployed position, the locking portion 13411 enters the locking hole 1332, locking the engaging seat 134 in the deployed position. The pressing portion 13413 is connected to the locking portion 13411. Applying pressure to the pressing portion 13413 causes the release operating member 1341 to slide away from the locking hole 1332, disengaging the locking portion 13411 from the locking hole 1332 and releasing the locking of the engaging seat 134. Optionally, the mounting cavity 1343 is provided with a slide groove 13431, and the release operating member 1341 is slidably connected to the slide groove 13431 via a pin 13412. Thus, the release operating member 1341 can slide along the length of the slide groove 13431, causing the locking portion 13411 to enter or exit the lock hole 1332. Optionally, the engaging seat 134 includes a second elastic member 13414. One end of the second elastic member 13414 is fixed within the mounting cavity 1343, and the other end of the second elastic member 13414 abuts against the release operating member 1341. The second elastic member 13414 continuously applies pressure to the release operating member 1341, causing the release operating member 1341 to slide toward the third connecting groove 1342. Alternatively, the second elastic member can be a spring, a spring, a torsion spring, or the like, as long as it can continuously apply pressure to the release operating member 1341. Optionally, the engaging seat 134 includes a housing 1344 and a cover plate 1345. The cover plate 1345 is detachably connected to the housing 134 to form an installation space in the engaging seat 134, and the installation cavity 1343 is disposed in the installation space.

42 to 45 , in one embodiment, the seat fixing mechanism 132 includes a fixing seat 233 and a snap-fit seat 234. The snap-fit seat 234 is pivotally connected to the fixing seat 233, and the snap-fit seat 234 is capable of pivoting between a folded position and an expanded position. Specifically, the cart includes a support frame 13, and a seat fixing mechanism 132 is connected to each of the two side rods (i.e., rods extending roughly along the length direction L) of the support frame 13, as shown in FIG42 . For ease of description, in the following description, only one of the seat fixing mechanisms 132 is described. Those skilled in the art should understand that the seat fixing mechanisms 132 provided on the two side rods have the same structure and pivot simultaneously between the folded position and the expanded position. It should be noted that in actual use, the snap-fit seats 234 of the seat fixing mechanism 132 arranged on the two side rods pivot between the folded position and the unfolded position at the same time, which is intended to facilitate the folding operation of the cart and to connect the seat 135, referring to Figures 43 and 45. This is required for actual use scenarios, but this does not mean that the two snap-fit seats 234 cannot pivot independently.

Continuing to refer to Figures 42 to 45, in one embodiment, the engaging seat 234 includes: an engaging portion 2346 and a base 2349. The engaging portion 2346 is configured to be inserted into an engaging groove (not shown) of the seat 135, and the base 2349 is connected to the engaging portion 2346 and is pivotally connected to the fixed seat 233. Optionally, the engaging portion 2346 and the base 2349 are integrally formed. Optionally, referring to Figure 43, there is an arc-shaped transition area between the engaging portion 2346 and the base 2349, and the width of the engaging portion 2346 is smaller than the width of the base 2349 to adapt to the shape of the side wall of the seat 135.

With reference to Figures 46 and 47, in one embodiment, when the engaging seats 234 are in the retracted position, the spacing between the engagement portions 2346 of the two engaging seats 234 is L1, and the spacing between the base portions 2349 of the two engaging seats 234 is L2, with reference to Figure 46. Optionally, L1 is approximately in the range of 359.46mm≤L1≤439.34mm, for example, L1 is approximately 399.4mm; and L2 is approximately in the range of 329.4mm≤L2≤402.6mm, for example, L2 is approximately 366mm. It should be noted that in this embodiment, because when the engaging seats 234 are in the retracted position, the engagement portions 2346 of the two engaging seats 234 are located below the two side bars of the support frame 13 and are at least partially obscured by the two side bars, the spacing between the two engagement portions 2346 indicated in Figure 46 is similar to the spacing between the two side bars of the support frame 13. Those skilled in the art will appreciate that the spacing between the two side bars of the support frame 13 can be adjusted to suit actual needs to change the size of L1. When the engaging seats 234 are in the deployed position, the spacing between the engagement portions 2346 of the two engaging seats 234 is L1', and the spacing between the base portions 2349 of the two engaging seats 234 is L2', as shown in Figure 47. Optionally, 301.86mm≤L1'≤368.94mm, with L1' being approximately 335.4mm, for example, and L2' being approximately 302mm, for example. Those skilled in the art will appreciate that, in actual use, an appropriate size of L1' can be selected based on the spacing between the two engagement slots of the seat 135 to be secured. When pivoting from the deployed position to the retracted position, the spacing between the two engaging seats 234 increases by ΔL (i.e., L1-L1') or ΔL (i.e., L2-L2'), for example, ΔL being approximately 44mm, as shown in Figures 46 and 47. In the folded position, the engaging seats 234 are lower than the upper surface of the fixing seat 233 in the height direction H, that is, located below the corresponding side bars of the support frame 13 (see Figure 48). Compared to the embodiment shown in Figures 30 to 41, the two engaging seats 234 in this embodiment have a larger spacing L1 when folded, thereby less encroaching on the space between the two side bars of the support frame 13. This helps reduce interference between the engaging seats 234 and other components of the stroller when folded. It also helps eliminate the need for a seat during use. The increased spacing between the two engaging seats 234 in the folded position helps reduce interference with user activities, such as reducing interference with and obstruction of a child seated in the compartment formed by the support frame 13 and the cover, or reducing interference with and obstruction of a user placing or removing items from the support frame. The seat 135 according to this embodiment is the same as the seat 135 according to the embodiment shown in Figures 30 to 41.

Referring to Figure 45 , in one embodiment, a first engaging hole 2347 is provided at the upper end of the engaging portion 2346 and/or a second engaging hole 2348 is provided at the lower end of the base 2349. The first engaging hole 2347 is configured to engage with a rod in the engaging groove of the seat 135 to stabilize and prevent the seat 135 from shaking when mounted on the stroller. The second engaging hole 2348 is configured to engage with a locking protrusion on the seat 135 to further secure the seat 135.

Referring to FIG49 , in one embodiment, the fixed seat 233 is provided with a pivot shaft 235, and the engaging seat 234 is provided with a mounting hole 2343. The mounting hole 2343 is sleeved on the pivot shaft 235, and the engaging seat 234 is capable of pivoting about the pivot shaft 235 and sliding along the axial direction of the pivot shaft 235. Optionally, the positions of the pivot shaft 235 and the mounting hole 2343 can be interchanged, that is, the fixed seat 233 is provided with the mounting hole 2343, and the engaging seat 234 is provided with the pivot shaft 235. When the engaging seat 234 pivots to a retracted position, the engaging seat 234 does not protrude above the upper surface of the fixed seat 233 in the height direction H. Alternatively, referring to FIG48 , when the engaging seat 234 pivots to a retracted position, the engaging seat 234 is lower than the upper surface of the fixed seat 233 in the height direction H. Optionally, the fixing seat 233 is further provided with a limiting portion 2333, and the engaging seat 234 is further provided with a limiting hole 2344. When the engaging seat 234 pivots to the retracted position, the limiting portion 2333 engages with the limiting hole 2344. Optionally, the positions of the limiting portion 2333 and the limiting hole 2344 are interchangeable, i.e., the fixing seat 233 is further provided with the limiting hole 2344, and the engaging seat 234 is provided with the limiting portion 2333. Optionally, the limiting portion 2333 includes a plurality of finger-shaped elastic members 23331, which are spaced apart from each other. The end of each elastic member 23331, which is away from the fixing seat 233, is convex and provided with a guiding slope 23332. When the elastic member 23331 is inserted into the limiting hole 2344, the inner wall of the limiting hole 2344 presses against the guiding slope 23332, causing the elastic member 23331 to deform toward the space between the elastic members 23331. After the elastic member 23331 is inserted into the limiting hole 2344, due to its own elastic restoring force, the elastic member 23331 presses against the inner wall of the limiting hole 2344. The raised end passes through the limiting hole 2344 and is stopped by the surrounding wall of the limiting hole 2344, thereby preventing the elastic member 23331 from escaping from the limiting hole 2344. In actual use, the user applies a certain pulling force to the engaging seat 234 to overcome the movement restriction between the raised end and the limiting hole, causing the engaging seat 234 to slide away from the fixing seat 233. Optionally, the fixing seat 233 is provided with an arc-shaped connecting body 2330, and the engaging seat 234 is provided with a groove body 2340, the shape of which matches the shape of the connecting body 2330. Specifically, the connecting body 2330 is provided to protrude from the side of the fixing seat 233 facing the engaging seat 234, and the groove body 2340 is provided to protrude from the side of the engaging seat 234 facing the fixing seat 233. When the engaging seat 234 is in the retracted position, the connecting body 2330 and the groove body 2340 are offset from each other. When the engaging seat 234 needs to be pivoted to the deployed position, the user applies a pulling force to the engaging seat 234, causing the elastic member 23331 to disengage from the limiting hole 2344, causing the engaging seat 234 to slide away from the fixed seat 233, and aligning one end of the connector 2330 with one end of the slot 2340. The user then rotates the engaging seat 234, causing the connector 2330 to gradually enter the slot 2340. When the engaging seat 234 is rotated to the deployed position, the connector 2330 is fully engaged with the slot 2340. Optionally, the positions of the connector 2330 and the slot 2340 can be interchanged, i.e., the fixed seat 233 also includes the slot 2340, and the engaging seat 234 includes the connector 2330. Optionally, the connector 2330 includes a first connecting groove 2331 and a first connecting edge 2332, and the slot 2340 includes a second connecting groove 2341 and a second connecting edge 2342. When the engaging seat 234 pivots to the deployed position, the second connecting groove 2341 accommodates the first connecting edge 2332, and the second connecting edge 2342 enters the first connecting groove 2331. Optionally, the first connecting groove 2331 can be a dovetail groove or a rectangular parallelepiped groove. Optionally, one of the connecting body 2330 and the groove body 2340 is provided with a limiting recess 2334, and the other of the connecting body 2330 and the groove body 2340 is provided with a limiting member 2345. When the engaging seat 234 pivots to the deployed position, the limiting member 2345 engages in the limiting recess 2334 to lock the engaging seat 234 in the deployed position. In this embodiment, a third elastic member (not shown) can also be provided between the fixed seat 233 and the engaging seat 234. The third elastic member abuts the engaging seat 234 and continuously applies pressure to the engaging seat 234, causing the engaging seat 234 to have a tendency to slide toward the fixed seat 233. In other embodiments, the third elastic member may not be provided, and the engaging seat 234 may be moved toward the fixing seat 233 along the pivot axis 235 through a pushing operation by the user.

The working principles of the embodiments shown in Figures 30 to 41 and the embodiments shown in Figures 42 to 49 will be described below respectively.

In the embodiment of the stroller shown in Figures 30 to 41 , when the seat 135 is not installed, the engaging base 134 of the seat securing mechanism 132 is in the retracted position shown in Figure 30 . At this point, the seat securing mechanisms 132 on either side of the stroller are spaced a large distance L1 (or L2). When the seat 135 is installed, if necessary, accessories that interfere with the seat 135, such as the dining tray assembly 130, need to be removed. However, if the dining tray assembly 130 does not interfere with the assembly of the seat 135, the dining tray assembly 130 does not need to be removed. When the user pivots the engaging base 134 from the retracted position to the deployed position, the engaging base 134 simultaneously slides away from the securing base 133 during the pivoting process due to the engagement of the connecting end 1333 with the third connecting slot 1342. In other words, the engaging bases 134 on either side of the stroller slide toward each other. As a result, the spacing between the seat fixing mechanisms 132 on both sides of the cart will be reduced to L1' (or L2') to match the spacing between the two engagement grooves of the seat 135. When the engaging seat 134 pivots to the deployed position, under the action of the second elastic member 13414, the locking portion 13411 enters the lock hole 1332, locking the engaging seat 134 in the deployed position. At this time, the engaging portion 1346 is inserted into the engagement groove of the seat 135, and the rear of the backrest of the seat 135 can be further engaged with the support frame 13 (as shown in Figure 37, the seat 135 is also engaged with the front rod of the support frame 13), completing the fixed installation of the seat 135. When the seat 135 is no longer needed, the engaging portion 1346 is pulled out of the engagement groove of the seat 135, the seat 135 is disengaged from the front rod of the support frame 13, and the seat 135 is removed. The user presses the pressing portion 13413 of the unlocking operating member 1341, causing the locking portion 13411 to exit the locking hole 1332. The user then pivots the engaging seat 134 toward the retracted position. Under the action of the first elastic member 1331, the engaging seat 134 slides toward the fixing seat 133. When the engaging seat 134 pivots to the retracted position, the seat fixing mechanisms 132 on both sides of the stroller are increased to L1 (or L2) again.

In the embodiment of the stroller shown in Figures 42 to 49 , when the seat 135 is not installed, the engaging base 234 of the seat fixing mechanism 132 is in the retracted position, as shown in Figure 46 . In this position, the engaging base 234 is lower than the upper surface of the fixing base 233 in the height direction H, and the seat fixing mechanisms 132 on both sides of the stroller are spaced apart by a larger distance, L1 (or L2). When the seat 135 is to be installed, if necessary, accessories that interfere with the seat 135 need to be removed, such as the dining tray assembly 130. The user then pivots the engaging base 234 from the retracted position to the deployed position. Specifically, the user first pulls the engaging base 234 away from the fixing base 233, disengaging the stopper 2333 from the stopper hole 2344. This reduces the distance between the seat fixing mechanisms 132 on both sides of the stroller to L1' (or L2'), matching the distance between the two engagement slots of the seat 135. The user then pivots the engaging base 234 toward the deployed position. During the pivoting process, the second connecting groove 2341 accommodates the first connecting edge 2332, and the second connecting edge 2342 enters the first connecting groove 2331, thereby gradually inserting and fitting the arcuate connecting body 2330 into the groove body 2340. When the engaging seat 234 pivots to the deployed position, the stopper 2345 engages with the stopper recess 2334, locking the engaging seat 234 in the deployed position. At this point, the engaging portion 2346 is inserted into the engaging groove of the seat 135. The rear portion of the backrest of the seat 135 can further engage with the support frame 13, completing the secure installation of the seat 135. When the seat 135 is no longer needed, the engaging portion 2346 is removed from the engaging groove of the seat 135 to remove the seat 135. The user pivots the engaging seat 234 toward the collapsed position. Under the action of the third elastic member or the user's push, the engaging seat 234 slides toward the fixed seat 233. When the engaging base 234 pivots to the folded position, the seat fixing mechanisms 132 on both sides of the stroller are increased to L1 (or L2) again.

With reference to Figures 50 and 51 , an embodiment of the present application provides a storage assembly 3. The storage assembly 3 is provided on, for example, a handlebar 14. Specifically, the storage assembly 3 includes: a mounting frame 30 and a container 31. In this embodiment, the handlebar 14 includes a push handle 142 and an extension rod 145, wherein the push handle 142 is roughly U-shaped, and the extension rod 145 is a straight tube and is connected to the end of the push handle 142 through a pivot assembly 4. The push handle 142 and the extension rod 145 can pivot with each other through the pivot assembly 4, thereby reducing the volume of the cart after folding. The pivot assembly 4 includes a first joint 41 and a second joint 42 that are pivotally connected to each other, the first joint 41 is connected to the push handle 142, and the second joint 42 is connected to the extension rod 145. Optionally, a release button 410 is provided on the first joint 41. For example, a release button 410 is provided on the inner side of the first joint 41 for releasing the lock between the push handle 142 and the extension rod 145, allowing the push handle 142 to pivot relative to the extension rod 145. The locking and releasing mechanism between the push handle 142 and the extension rod 145 can use any locking and releasing mechanism known in the art, and this application is not limited thereto. In this embodiment, the storage assembly 3 is connected to the pivot assembly 4. Specifically, in this embodiment, the second joint 42 of the pivot assembly 4 serves as the mounting bracket 30. Optionally, the mounting bracket 30 can be fixedly installed at other locations on the rider 14, such as the extension rod 145, the push handle 142, etc., or fixedly installed at other parts of the frame, such as the rear foot bar 12, the support frame 13, etc., as long as the storage assembly 3 does not interfere with the folding and unfolding of the frame. The storage assembly 3 according to this embodiment can be installed in any of the embodiments shown in Figures 1 to 49.

In the embodiment shown in Figures 50 and 51 , the outer wall 301 of the mounting frame 30 is sequentially provided with a first protrusion 302 and a second protrusion 303 that protrude from the outer wall 301. The first protrusion 302 and the second protrusion 303 form a generally umbrella-shaped structure, wherein the first protrusion 302 is radially inwardly recessed relative to the second protrusion 303. This forms a first engaging groove 304 between the side of the second protrusion 303 facing the vehicle frame and the outer wall 301 of the mounting frame 30. The container 31 is provided with a locking mechanism 32 for removably attaching to the mounting frame 30. Specifically, the locking mechanism 32 includes a locking edge 321 that forms a generally U-shaped second engaging groove 324. Two opposing edges of the generally U-shaped second engaging groove 324 are each provided with, for example, a locking protrusion 322. The two locking protrusions 322 divide the second engaging groove 324 into a guide portion 3241 and an engaging portion 3242. The distance between the two locking protrusions 322 is slightly smaller than the radial dimension of the first protrusion 302. The engaging portion 3242 is shaped similarly to the outer periphery of the first protrusion 302, and its radial dimension is substantially equal to (or slightly larger than) the radial dimension of the first protrusion 302, thereby allowing the first protrusion 302 to be accommodated within the engaging portion 3242. The guide portion 3241 has an opening 3243 (i.e., the opening 3243 of the generally U-shaped second engaging groove 324), and its radial dimension is larger than that of the first protrusion 302. Preferably, the radial dimension of the guide portion 3241 is larger than that of the first protrusion 302 and smaller than that of the second protrusion 303. When installing the container 31, the opening 3243 of the second engaging groove 324 is aligned with the first protrusion 302, allowing the first protrusion 302 to enter the guide portion 3241. The container 31 is further moved until the first protrusion 302 contacts the two locking protrusions 322. At this point, because the distance between the two locking protrusions 322 is slightly smaller than the radial dimension of the first protrusion 302, the first protrusion 302 abuts against the two locking protrusions 322. The user continues to apply external force to move the container 31, causing the first protrusion 302 to press against the two locking protrusions 322, thereby deforming the two locking protrusions 322 away from each other, causing the first protrusion 302 to enter the engaging portion 3242 of the second engaging groove 324. When the first protrusion 302 completely enters the engaging portion 3242, it is accommodated in the engaging portion 3242 and no longer presses the two locking protrusions 322. As a result, the two locking protrusions 322 return to their original positions under the action of their own elastic restoring force. At this point, a portion of the engaging edge 321 enters the first engaging groove 304, and the first protrusion 302 is accommodated and locked in the engaging portion 3242. At this point, the container 31 is fixed to the mounting frame 30, and the storage assembly 3 is completely installed.

In one embodiment, a portion of the engaging edge 321 near the locking protrusion 322 is optionally provided with a deformation groove 323. When the first protrusion 302 presses against the locking protrusion 322, the deformation groove 323 helps the locking protrusion 322 deform away from the other locking protrusion 322. Alternatively, the container 31 may be any type of container, such as a cup holder or a storage basket. Optionally, a support rib 33 is provided on the outer wall of the container 31 near the second engaging groove 324. When the first protrusion 302 is locked in the engaging portion 3242, the support rib 33 abuts against the outer wall of the second protrusion 303, further strengthening the locking.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims (30)

A pull rod mechanism (2), characterized in that it includes: a third connecting seat (194); a rotating part (192), the rotating part (192) is connected to the third connecting seat (194) and can pivot between a first pivot position and a second pivot position relative to the third connecting seat (194); a pull rod (19), one end of the pull rod (19) is connected to the rotating part (192), when the rotating part (192) pivots to the first pivot position, the pull rod (19) pivots to an upright position; when the rotating part (192) pivots to the second pivot position, the pull rod (19) pivots to a lying position; and a first positioning member (193), the first positioning member (193) is arranged between the third connecting seat (194) and the rotating part (192), the first positioning member (193) is configured to limit the pivoting of the rotating part (192). The pull rod mechanism (2) according to claim 1 is characterized in that the first positioning member (193) is a damping plate (1931), and the damping plate (1931) is clamped between the rotating part (192) and the third connecting seat (194). The pull rod mechanism (2) according to claim 2 is characterized in that one end of the third connecting seat (194) is recessed inward to form a pivot space (1944), at least a portion of the rotating portion (192) is accommodated in the pivot space (1944), and the damping plate (1931) is clamped between the rotating portion (192) and the side wall of the pivot space (1944). The pull rod mechanism (2) according to claim 3 is characterized in that the pivot space (1944) includes two side walls (19441) arranged opposite to each other, at least a portion of the rotating part (192) is located between the two side walls (19441) of the pivot space (1944), and the first positioning member (193) includes two damping plates (1931), and the two damping plates (1931) are respectively clamped between the two side walls (19441) of the pivot space (1944) and the rotating part (192). The pull rod mechanism (2) according to claim 1 is characterized in that the first positioning member (193) includes: a positioning recess (1932), which is arranged at one of the rotating part (192) and the third connecting seat (194); and a positioning protrusion (1945), which is arranged at the other of the rotating part (192) and the third connecting seat (194); when the positioning protrusion (1945) enters the positioning recess (1932), the pivoting of the rotating part (192) is restricted by the shape matching of the positioning recess (1932) and the positioning protrusion (1945). The pull rod mechanism (2) according to claim 5 is characterized in that one end of the third connecting seat (194) is recessed inward to form a pivot space (1944), at least a portion of the rotating part (192) is accommodated in the pivot space (1944), and the inner surface of at least one side wall of the pivot space (1944) faces at least one surface of the rotating part; one of the surface of the rotating part (192) and the side wall of the pivot space is provided with at least one elastic finger (199), and the other of the surface of the rotating part (192) and the side wall of the pivot space is provided with a plurality of positioning recesses (1932), and the positioning protrusion (1945) is provided on the side of the elastic finger (199) facing the positioning recess (1932), and the positioning protrusion (1945) is engaged with one of the plurality of positioning recesses (1932) to position the pull rod at one of the plurality of pivot angles. The pull rod mechanism (2) according to claim 1 is characterized in that one end of the third connecting seat (194) is recessed inward to form a pivot space (1944), at least a portion of the rotating part (192) is accommodated in the pivot space (1944), and a limiting groove (19440) is provided on the inner wall of the pivot space (1944) of the third connecting seat (194); the rotating part (192) is provided with a limiting protrusion (1923), and the limiting protrusion (1923) slides in the limiting groove (19440) as the rotating part (192) pivots, and when the rotating part (192) pivots from the first pivot position to the second pivot position, the limiting protrusion (1923) abuts against the side wall of the limiting groove (19440) to limit the rotating part (192) from continuing to pivot. The pull rod mechanism (2) according to claim 1 is characterized in that it also includes: a slide rail (196), the third connecting seat (194) is connected to the slide rail (196) and can slide along the slide rail (196) between a first sliding position and a second sliding position; when the third connecting seat (194) slides to the first sliding position, the pull rod (19) slides to the extended position; when the third connecting seat (194) slides to the second sliding position, the pull rod (19) slides to the storage position. The pull rod mechanism (2) according to claim 8 is characterized in that it also includes: a locking device, which is arranged on the third connecting seat (194) and the sliding rail (196), and the locking device is used to lock the third connecting seat (194) in the first sliding position and/or the second sliding position. The pull rod mechanism (2) according to claim 9 is characterized in that the third connecting seat (194) is provided with a first through hole (1941) which can be slidably mounted on the slide rail (196), and the locking device includes: a second through hole (1942) which is provided on the side wall of the first through hole (1941); a second positioning hole (1961) which is provided on the portion of the slide rail (196) corresponding to the first sliding position of the third connecting seat (194); a second positioning member (1960) which Arranged in the slide rail (196), at least a portion of the second positioning member (1960) can slide in the second positioning hole (1961) to retract and protrude from the second positioning hole (1961); when the third connecting seat (194) slides to the first sliding position, at least a portion of the second positioning member (1960) protrudes from the second positioning hole (1961) and enters the second through hole (1942) to lock the third connecting seat (194) in the first sliding position. The pull rod mechanism (2) according to claim 9 is characterized in that the third connecting seat (194) is provided with the first through hole (1941) which can be slidably mounted on the slide rail (196), and the locking device includes: a second through hole (1942) provided on the side wall of the first through hole (1941); a third positioning hole (1963) provided on the portion of the slide rail (196) corresponding to the second sliding position of the third connecting seat (194); a third positioning member (1962), It is arranged in the slide rail (196), and at least a portion of the third positioning member (1962) can slide in the third positioning hole (1963) to retract and protrude from the third positioning hole (1963); when the third connecting seat (194) slides to the second sliding position, at least a portion of the third positioning member (1962) protrudes from the third positioning hole (1963) and enters the second through hole (1942) to lock the third connecting seat (194) in the second sliding position. The pull rod mechanism (2) according to claim 9 is characterized in that it also includes: a fixed portion (198), the slide rail (196) is connected to the fixed portion (198), and when the rotating portion (192) pivots from the second pivot position to the first pivot position, the pull rod (19) abuts against the front surface of the fixed portion (198) to limit the rotating portion (192) from continuing to pivot. A cart comprises: a base frame (10); and a pull rod mechanism (2) according to any one of claims 1 to 12, wherein the pull rod mechanism (2) is connected to the base frame (10). A vehicle frame (1), characterized by comprising: Base frame (10); a front foot bar (11), the lower end of which is pivotally connected to the base frame (10); a rear foot bar (12), the lower end of the rear foot bar (11) being pivotally connected to the chassis (10); and A rider (14), wherein the lower end of the rider (14) is pivotally connected to the upper end of the front foot bar (11), and the upper end of the rear foot bar (12) is pivotally connected to the rider (14); When the bicycle frame (1) switches from an unfolded state to a folded state, the rider (14) pivots relative to the front foot bar (11), and drives the front foot bar (11) and the rear foot bar (12) to pivot relative to the base frame (10), so that the rider (14), the front foot bar (11) and the rear foot bar (12) are folded toward the base frame (10). The frame (1) according to claim 14 is characterized in that, when the frame (1) switches from the expanded state to the folded state, the rider (14) and the rear foot bar (12) pivot toward the front of the frame (1), and the front foot bar (11) pivots toward the rear of the frame (1). The frame (1) according to claim 14 is characterized in that, when the frame (1) switches from the expanded state to the folded state, the angle between the rider (14) and the rear foot rod (12) gradually decreases. The vehicle frame (1) according to claim 14, characterized in that it further comprises: a locking joint (15) connected to the lower end of the rider (14) and the upper end of the front foot bar (11), the locking joint (15) being configured to lock the rider (14) and the front foot bar (11) to prevent relative pivoting of the rider (14) and the front foot bar (11); and A support frame (13) is pivotally connected to the locking joint (15). The vehicle frame (1) according to claim 17, characterized in that it further comprises: A linkage rod (18), one end of which is pivotally connected to the support frame (13), and the other end of which is pivotally connected to the rear foot rod (12). The pivot point between the rear foot bar (12) and the rider (14) is located on the side of the rider (14) facing the inside of the frame (1), and the projection of the pivot trajectory of the rear foot bar (12) along the height direction (H) does not overlap with the projection of the pivot trajectory of the front foot bar (11) and/or the rider (14) along the height direction (H). The vehicle frame (1) according to claim 18, characterized in that it further comprises: When the vehicle frame (1) switches from an unfolded state to a folded state, the linkage rod (18) pivots toward the rear of the vehicle frame (1), the rear foot rod (12) pivots toward the front of the vehicle frame (1), and the angle between the linkage rod (18) and the rear foot rod (12) gradually increases. The vehicle frame (1) according to claim 14, characterized in that it further comprises: A support frame (13) is pivotally connected to the rider (14). The vehicle frame (1) according to claim 20, characterized in that it further comprises: A linkage rod (18), one end of which is pivotally connected to the support frame (13), and the other end of which is pivotally connected to the front foot rod (11). The pivot point between the rear foot bar (12) and the rider (14) is located below the rider (14) in the height direction (H), and the projection of the pivot trajectory of the rear foot bar (12) along the height direction (H) at least partially overlaps with the pivot trajectory of the front foot bar (11) and/or the projection of the rider (14) along the height direction (H). A seat fixing mechanism (132), characterized by comprising: Fixed seat (133, 233); and A snap-fit seat (134, 234), wherein the snap-fit seat (134, 234) is pivotally connected to the fixing seat (133, 233), The engaging seat (134, 234) can move between a folded position and an expanded position relative to the fixing seat (133, 233); the engaging seat (134, 234) is further away from the fixing seat (133, 233) when it is in the expanded position than when it is in the folded position. The seat fixing mechanism (132) according to claim 22, characterized in that: The fixing seat (133) is provided with a connecting end portion (1333), and the engaging seat (134) is provided with a third connecting groove (1342). The connecting end portion (1333) is inserted into the third connecting groove (1342) to pivotally connect the fixing seat (133) and the engaging seat (134). The seat fixing mechanism (132) according to claim 23 is characterized in that: At least one first convex portion (13331) and at least one first concave portion (13332) are formed on one end of the connecting end portion (1333) facing the engaging seat (134), and a first inclined surface (13333) is provided between the first convex portion (13331) and the first concave portion (13332). The bottom wall of the third connecting groove (1342) is formed with at least one second protrusion (13421) and at least one second recess (13422), and a second inclined surface (13423) is provided between the second protrusion (13421) and the second recess (13422). When the engaging seat (134) is in the retracted position, the second protrusion (13421) is engaged with the first recess (13331), and the first protrusion (13331) is engaged with the second recess (13422). When the locking seat (134) pivots from the folded position to the unfolded position, the first protrusion (13331) disengages from the second recess (13422), and through the cooperation between the second inclined surface (13423) and the first inclined surface (13333), the first protrusion (13331) slides to a position abutting against the second protrusion (13421), and the locking seat (134) slides in a direction away from the fixed seat (133). The seat fixing mechanism (132) according to claim 23 is characterized in that: The connecting end portion (1333) is formed with two opposite first protrusions (13331) and two opposite first recesses (13332) at one end facing the engaging seat (134), the two first protrusions (13331) are separated by two first recesses (13332), and a first inclined surface (13333) is provided between adjacent first protrusions (13331) and first recesses (13332). The bottom wall of the third connecting groove (1342) is formed with two opposite second protrusions (13421) and two opposite second recesses (13422), the two second protrusions (13421) are separated by two second recesses (13422), and a second inclined surface (13423) is provided between adjacent second protrusions (13421) and second recesses (13422). When the engaging seat (134) is in the folded position, the two second protrusions (13421) are respectively engaged in the two first recesses (13331), and the two first protrusions (13331) are respectively engaged in the two second recesses (13422). When the locking seat (134) pivots from the folded position to the unfolded position, the first protrusion (13331) disengages from the second recess (13422), and through the cooperation between the second inclined surface (13423) and the first inclined surface (13333), the first protrusion (13331) slides to a position abutting against the second protrusion (13421), and the locking seat (134) slides in a direction away from the fixed seat (133). The seat fixing mechanism (132) according to claim 22, characterized in that: The engaging seat (134) is provided with a mounting through hole (1340), and an end cover (1335) and a first elastic member (1331) are provided in the mounting through hole (1340). The end cover (1335) is connected to the fixing seat (133), and one end of the first elastic member (1331) abuts against the end wall of the mounting through hole (1340), and the other end of the first elastic member (1331) abuts against the end cover (1335). The first elastic member (1331) continuously applies pressure to the engaging seat (134), so that the engaging seat (134) has a tendency to slide toward the fixing seat (133). The seat fixing mechanism (132) according to claim 23 is characterized in that: The connecting end portion (1333) is provided with a lock hole (1332), The engaging seat (134) includes a release operating member (1341). When the engaging seat (134) pivots to the unfolded position, at least a portion of the unlocking operating member (1341) enters the locking hole (1332) to lock the engaging seat (134) in the unfolded position. The seat fixing mechanism (132) according to claim 22, characterized in that: One of the fixing seat (233) and the engaging seat (234) is provided with a pivot shaft (235). The other of the fixing seat (233) and the engaging seat (234) is provided with a mounting hole (2343). The mounting hole (2343) is sleeved on the pivot shaft (235), and the engaging seat (234) can pivot around the pivot shaft (235) and slide along the axial direction of the pivot shaft (235). When the engaging seat (234) pivots to the folded position, the engaging seat (234) does not protrude from the upper surface of the fixing seat (233) in the height direction. The seat fixing mechanism (132) according to claim 22, characterized in that: One of the fixing seat (233) and the engaging seat (234) is further provided with a limiting portion (2333). The other of the fixing seat (233) and the engaging seat (234) is further provided with a limiting hole (2344). When the engaging seat (234) pivots to the folded state, the limiting portion (2333) is engaged in the limiting hole (2344). The seat fixing mechanism (132) according to claim 22, characterized in that: One of the fixing seat (233) and the engaging seat (234) is further provided with an arc-shaped connecting body (2330). The other of the fixing seat (233) and the engaging seat (234) is further provided with a groove body (2340), the shape of which matches the shape of the connecting body (2330). When the engaging seat (234) pivots to the expanded state, the connecting body (2330) fits into the slot body (2340).