CN118124657A - Child cart capable of being folded and unfolded smoothly - Google Patents

Abstract

The present invention discloses a child stroller that can be folded and unfolded smoothly. During the unfolding process of the child stroller, the linkage unlocking part of the unlocking movable part is kept away from the seat locking mechanism and the frame locking mechanism, so the linkage unlocking part will not generate an unlocking force on the seat locking mechanism and the frame locking mechanism. Therefore, no matter the user unfolds the frame first and then the seat part and the backrest part, or unfolds the backrest part and the seat part first and then the frame, the linkage unlocking part will not fold the unfolded seat part and the frame again. The operating habits of different users can be met to unfold the child stroller accordingly. The invention has the characteristics of easy operation and reasonable design.

Description

A child stroller with smooth folding and unfolding

[Technical field]

The invention relates to the field of baby carriages, in particular to a baby carriage which can be folded and unfolded smoothly.

【Background technique】

The seats on many baby stroller frames are detachably connected. In order to facilitate storage and improve the efficiency of folding the baby stroller frames, there are many such baby strollers on the market that can be folded together with the seats. Such baby strollers generally have seat frame joints and frame joints. The seat frame joints are used to lock the seat frame when it is unfolded, and the frame joints are used to lock the front foot rod, rear foot rod and push rod when they are unfolded. When folding, the seat frame joints are unlocked by controlling the unlocking of the seat frame joints, and then the frame joints are further linked to unlock to achieve the folding of the entire vehicle. After the linkage unlocking and folding are completed, the linkage unlocking mechanism maintains the unlocking force and action on the seat frame joints and the frame joints. Therefore, when unfolding such baby strollers, the correct way to unfold them is to unfold the seat frame first, and then unfold the frame, because when the seat frame is unfolded, the seat frame joints lock the seat frame in the unfolded state, and at this time, there is no linkage action and force on the frame joints, so the frame unfolds smoothly.

However, the operation of unfolding the seat frame first and then the bicycle frame does not conform to people's operating habits, and people cannot properly unfold the seat frame for use because the bicycle frame is not unfolded; and if the bicycle frame is unfolded first and then the seat frame, since the entire bicycle is in a folded state, the unlocking linkage part always directly or indirectly keeps unlocking the bicycle frame joint, so that the unlocking part of the bicycle frame joint is acted upon by the driving force, and the bicycle frame joint will interfere with each other and become stuck during the unfolding process, making it impossible to unfold the bicycle frame smoothly. Moreover, ordinary people are not familiar with the operating instructions.

Therefore, the present invention is studied and proposed in view of the above problems.

[Summary of the invention]

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a child stroller that can be folded and unfolded smoothly. The unfolding action conforms to the user's operating habits, and no matter whether the frame is unfolded first or the backrest and seat are unfolded first, the operation and use are smooth, convenient and the design is reasonable, avoiding the limitation of the folding order in the prior art and the interference and jamming phenomenon caused by unfolding the frame first.

The present invention discloses a child stroller that can be folded and unfolded smoothly, and the child stroller has a folded state and an unfolded state, and comprises:

A frame 1, the frame 1 comprising a front foot rod 11, a rear foot rod 12 and a push rod 13, wherein the upper end of the front foot rod 11, the upper end of the rear foot rod 12 and the lower end of the push rod 13 are rotatably connected;

A frame locking mechanism 14, the frame locking mechanism 14 is used to lock the frame 1 in the unfolded state;

A seat portion 2, wherein the seat portion 2 is connected to the vehicle frame 1 in a relatively foldable manner;

A seat locking mechanism 22, the seat locking mechanism 22 is used to lock the seat portion 2 in an unfolded state relative to the vehicle frame 1;

A backrest portion 3, wherein the backrest portion 3 is rotatably connected to the seat portion 2, and a backrest locking mechanism 31 is provided between the backrest portion 3 and the seat portion 2 for locking the backrest portion 3 in an unfolded state relative to the seat portion 2;

A linkage unlocking member 4, the linkage unlocking member 4 is used to link the unlocking action of the seat locking mechanism 22 and the frame locking mechanism 14;

The unlocking movable member 5 is connected to the linkage unlocking member 4 in an automatically resettable manner. The unlocking movable member 5 is configured to generate an axial driving force on the linkage unlocking member 4 when the backrest portion 3 is flipped forward and folded relative to the seat portion 2, so that the linkage unlocking member 4 moves axially for linkage unlocking. When the child stroller is unfolded, the linkage unlocking member 4 remains away from the seat locking mechanism 22 and the frame locking mechanism 14.

In the stroller that can be folded and unfolded smoothly as described above, the linkage unlocking member 4 is configured to always be subjected to an elastic thrust toward the unlocking movable member 5; during the process of the backrest portion 3 being flipped forward and folded relative to the seat portion 2, the axial driving force generated by the unlocking movable member 5 on the linkage unlocking member 4 is greater than the elastic thrust received by the linkage unlocking member 4, and during the process of the backrest portion 3 being flipped backward and unfolded relative to the seat portion 2, the axial driving force generated by the unlocking movable member 5 on the linkage unlocking member 4 is less than the elastic thrust received by the linkage unlocking member 4.

As described above, in a child stroller that can be folded and unfolded smoothly, when the child stroller is in the folded state and the unfolded state, the unlocking movable part 5 does not generate an axial driving force on the linkage unlocking part 4; and during the process of the backrest part 3 flipping backward relative to the seat part 2 to unfold, the process of the seat part 2 rotating relative to the frame 1 to unfold, and the process of the frame 1 to unfold, the linkage unlocking part 4 is always away from the seat locking mechanism 22 and the frame locking mechanism 14.

As described above, in a child stroller that can be folded and unfolded smoothly, an unlocking drive member 30 is provided at the lower end of the backrest portion 3, and the unlocking drive member 30 and the unlocking movable member 5 are configured as follows: when the backrest portion 3 is flipped forward and folded relative to the seat portion 2, the unlocking drive member 30 presses the end of the unlocking movable member 5 so that the linkage unlocking member 4 is subjected to the axial driving force of the unlocking movable member 5 and moves toward the frame locking mechanism 14 side for linkage unlocking, and finally the unlocking drive member 30 passes over the unlocking movable member 5; when the backrest portion 3 is flipped backward and unfolded relative to the seat portion 2, the unlocking drive member 30 pushes the side of the unlocking movable member 5 so as to force the unlocking movable member 5 to perform an evasive action, thereby keeping the linkage unlocking member 4 away from the seat locking mechanism 22 and the frame locking mechanism 14.

In the above-mentioned stroller with smooth folding and unfolding, the unlocking driving member 30 has an unlocking driving inclined portion 301 and a pushing portion 302, and when the backrest portion 3 is flipped forward relative to the seat portion 2 and folded, the unlocking driving inclined portion 301 pushes the end of the unlocking movable member 5, and when the backrest portion 3 is flipped backward relative to the seat portion 2 and unfolded, the pushing portion 302 pushes the side of the unlocking movable member 5 to force the unlocking movable member 5 to rotate and fold relative to the linkage unlocking member 4 to avoid it, and when the unlocking driving member 30 stops pushing the unlocking movable member 5, the unlocking movable member 5 automatically returns to its original position and unfolds.

In the above-mentioned stroller with smooth folding and unfolding, one end of the unlocking movable part 5 is rotatably connected to the linkage unlocking part 4 through a pivot, and an unfolding elastic part 51 is provided between the unlocking movable part 5 and the linkage unlocking part 4 for keeping the unlocking movable part 5 elastically unfolded relative to the linkage unlocking part 4, and when the backrest part 3 is flipped forward and folded relative to the seat part 2, the other end of the unlocking movable part 5 is pushed by the unlocking driving inclined part 301, and the pushing part 302 moves from one side of the unlocking movable part 5 to the other side and passes over the unlocking movable part 5, so that the unlocking movable part 5 has no axial driving force on the linkage unlocking part 4.

As described above, in a child stroller that can be folded and unfolded smoothly, a movable blocking structure 6 is provided between the unlocking movable member 5 and the linkage unlocking member 4 for limiting the position of the unlocking movable member 5 when the unlocking movable member 5 is unfolded relative to the linkage unlocking member 4.

In the stroller that can be smoothly folded and unfolded as described above, the frame locking mechanism 14 is located between the upper end of the rear leg rod 12 and the lower end of the push rod 13, and the frame locking mechanism 14 is used to lock the push rod 13 in an unfolded state relative to the rear leg rod 12; the front leg rod 11 is configured to rotate synchronously with the push rod 13 relative to the rear leg rod 12 to unfold or to rotate synchronously with the push rod 13.

As described above, a child stroller that can be folded and unfolded smoothly, the frame locking mechanism 14 includes frame locking tooth grooves 141 that are arranged on opposite sides of the upper end of the rear foot rod 12 and the lower end of the push rod 13, and a frame locking gear 142 that can be slidably arranged between the upper end of the rear foot rod 12 and the lower end of the push rod 13 and can be simultaneously engaged with the frame locking tooth grooves 141 of the upper end of the rear foot rod 12 and the lower end of the push rod 13, and a frame locking gear reset member 143 for driving the frame locking gear 142 to elastically reset is arranged between the frame locking gear 142 and the upper end of the rear foot rod 12; the frame locking gear 142 can be linked with the linkage unlocking member 4 to disengage from the frame locking tooth groove 141 at the lower end of the push rod 13.

As described above, in a child stroller that can be folded and unfolded smoothly, the upper end of the front foot rod 11 is rotatably connected to the upper end of the rear foot rod 12 via a pivot, the connecting pivot between the front foot rod 11 and the rear foot rod 12 deviates from the connecting pivot between the push rod 13 and the rear foot rod 12, the upper end of the front foot rod 11 and the lower end of the push rod 13 are movably connected via a frame linkage 15, one end of the frame linkage 15 is eccentric to the connecting pivot between the front foot rod 11 and the rear foot rod 12 and is hinged to the upper end of the front foot rod 11, and the other end of the frame linkage 15 is eccentric to the connecting pivot between the push rod 13 and the rear foot rod 12 and is hinged to the lower end of the push rod 13.

In the above-mentioned child stroller that can be folded and unfolded smoothly, a seat base 20 fixedly connected to the seat portion 2 is provided on one side of the seat portion 2 , and the seat base 20 is detachably connected to the frame 1 .

As described above, a stroller for children that can be folded and unfolded smoothly is provided with a seat connecting seat 21 between the seat base 20 and the frame 1. The seat base 20 can rotate with the seat connecting seat 21 and is detachably connected thereto. The seat connecting seat 21 is rotatably connected to the frame 1. The seat locking mechanism 22 includes a seat locking tooth groove 221 provided on opposite sides of the seat connecting seat 21 and the lower end of the push rod 13. A seat locking tooth groove 221 is provided between the seat connecting seat 21 and the lower end of the push rod 13, which can be simultaneously engaged with the seat connecting seat 21 and the lower end of the push rod 13. A seat locking gear 222 is provided between the seat locking gear 222 and the lower end of the push rod 13, and a seat locking gear reset member 223 is provided between the seat locking gear 222 and the lower end of the push rod 13, which is used to drive the seat locking gear 222 to elastically reset so as to simultaneously engage with the connecting seat 21 and the seat locking tooth groove 221 at the lower end of the push rod 13; a joint unlocking member 211 is movably provided on the outer surface of the seat connecting seat 21, and is used to push the seat locking gear 222 to disengage from the seat locking tooth groove 221 of the connecting seat 21, and the joint unlocking member 211 can be unlocked by the linkage unlocking member 4.

In a child stroller that can be folded and unfolded smoothly as described above, the rear side of the seat portion 2 is rotatably connected to an armrest portion 7 located in front of the backrest portion 3, and an armrest locking mechanism 71 is provided between the armrest portion 7 and the seat portion 2 for locking the armrest portion 7 in an unfolded state relative to the seat portion 2, and the armrest locking mechanism 71 is configured to be unlocked in conjunction with the unlocking member 4.

As described above, in a child stroller that can be folded and unfolded smoothly, the armrest portion 7 includes an armrest base 70 rotatably connected to the seat portion 2; the armrest locking mechanism 71 includes an armrest locking slot 711 provided on the armrest base 70 and an armrest sliding seat 712 slidably provided on the seat portion 2, the armrest sliding seat 712 is provided with an armrest locking protrusion 7121 for being inserted into the armrest locking slot 711, and an armrest locking block reset member 713 for driving the armrest sliding seat 712 to elastically reset is provided between the armrest sliding seat 712 and the seat portion 2; the armrest sliding seat 712 is configured to be linked to an unlocking action by a linked unlocking member 4.

As described above, in a stroller that can be folded and unfolded smoothly, the backrest locking mechanism 31 includes a backrest locking notch 311 provided on the seat portion 2 and a backrest locking slider 312 slidably provided on the backrest portion 3 and capable of being inserted into the backrest locking notch 311, a slider reset member 313 for driving the backrest locking slider 312 to elastically reset is provided between the backrest locking slider 312 and the backrest portion 3, a backrest unlocking button 33 is provided on the backrest portion 3, and a backrest unlocking linkage member 32 for linking the backrest locking slider 312 to disengage from the backrest locking notch 311 is provided between the backrest unlocking button 33 and the backrest locking slider 312.

Compared with the prior art, the present invention provides a linkage unlocking member that can be folded elastically in one direction. When the backrest is flipped forward relative to the seat, the linkage unlocking member is used to generate an axial driving force to cause the linkage unlocking member to move axially to link the unlocking action of the seat locking mechanism and the frame locking mechanism, thereby releasing the locked state of the seat and the frame. The invention has the characteristics of convenient unlocking and folding. When the child stroller is unfolded, the linkage unlocking member is kept away from the seat locking mechanism and the frame locking mechanism, that is, the linkage unlocking member does not generate an unlocking force on the seat locking mechanism and the frame locking mechanism. Therefore, no matter whether the user unfolds the frame first or the backrest and the seat first, the linkage unlocking member will not interfere with the unfolding action of the seat and the frame, and the unfolding action is smooth to avoid interference from unlocking resistance, which can better meet the user's operating habit of unfolding the frame first and then the seat and the backrest. Therefore, the invention has the characteristics of convenient use, reasonable design and ergonomics.

【Brief Description of the Drawings】

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

FIG. 1 is a perspective view of the present invention in an unfolded state.

FIG. 2 is a side view of the present invention in an unfolded state.

FIG. 3 is one of the side views of the present invention during the folding process.

FIG. 4 is a second side view of the present invention during the folding process.

FIG. 5 is a side view of the present invention in a folded state.

FIG. 6 is one of the exploded views of the present invention.

FIG. 7 is a second explosion diagram of the present invention.

FIG. 8 is a schematic structural diagram of the unlocking movable member when it is unfolded relative to the linkage unlocking member in the present invention.

FIG. 9 is a schematic structural diagram of the unlocking movable member when it is retracted relative to the linkage unlocking member in the present invention.

FIG. 10 is a schematic structural diagram of the armrest sliding seat of the present invention.

【Detailed ways】

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figs. 1-10, the present invention discloses a stroller that can be folded and unfolded smoothly. The stroller has a folded state and an unfolded state, and includes a frame 1, wherein the frame 1 includes a front foot rod 11, a rear foot rod 12 and a push rod 13, wherein the upper ends of the front foot rod 11, the upper ends of the rear foot rod 12 and the lower ends of the push rod 13 are rotatably connected; a frame locking mechanism 14, wherein the frame locking mechanism 14 is used to lock the frame 1 in the unfolded state; a seat portion 2, wherein the seat portion 2 is relatively foldably connected to the frame 1; a seat locking mechanism 22, wherein the seat locking mechanism 22 is used to lock the seat portion 2 in the unfolded state relative to the frame 1; a backrest portion 3, wherein the backrest portion 3 is rotatably connected to the seat portion 2, wherein the backrest portion 3 is rotatably connected to the seat portion 2. A backrest locking mechanism 31 is provided between the backrest portion 3 and the seat portion 2 for locking the backrest portion 3 in an unfolded state relative to the seat portion 2; a linkage unlocking member 4, which is used to link the unlocking actions of the seat locking mechanism 22 and the frame locking mechanism 14; an unlocking movable member 5, which is automatically resettable and connected to the linkage unlocking member 4, and is configured to generate an axial driving force for the linkage unlocking member 4 when the backrest portion 3 is flipped forward and folded relative to the seat portion 2, so that the linkage unlocking member 4 moves axially for linkage unlocking, and when the unlocking movable member 5 is unfolded, the linkage unlocking member 4 remains away from the seat locking mechanism 22 and the frame locking mechanism 14. With this design, no matter whether the user unfolds the frame first or unfolds the backrest and the seat first and then the frame, the linkage unlocking component will not interfere with the unfolding action of the seat and the frame, which can better meet the operating habits of the same user, and has the characteristics of smooth and convenient operation and reasonable design, avoiding the limitation of the folding order in the prior art and the interference and jamming phenomenon caused by unfolding the frame first.

As shown in Figures 6 and 7, an unlocking linkage push rod 41 is extended from the linkage unlocking member 4. When the linkage unlocking member 4 moves axially, the unlocking linkage push rod 41 extends out of the seat base 20 of the seat part 2 to unlock the linkage seat locking mechanism 22 and the frame locking mechanism 14. A pushing elastic member is provided between the linkage unlocking member 4 and the seat base 20, so that the linkage unlocking member 4 is always subjected to an elastic thrust toward the unlocking movable member 5 side; in the process of the backrest portion 3 being flipped forward and folded back relative to the seat portion 2, the axial driving force generated by the unlocking movable member 5 on the linkage unlocking member 4 is greater than the elastic thrust received by the linkage unlocking member 4, so that the linkage unlocking member 4 can move axially for linkage unlocking; and in the process of the backrest portion 3 being flipped backward and unfolded relative to the seat portion 2, the axial driving force generated by the unlocking movable member 5 on the linkage unlocking member 4 is less than the elastic thrust received by the linkage unlocking member 4. At this time, the linkage unlocking member 4 will not move axially toward the seat locking mechanism 22 side, that is, it will not generate an unlocking force on the seat locking mechanism 22 and the frame locking mechanism 14. Therefore, there is no interference and jamming in the process of first unfolding the seat portion or the frame of the child stroller, which is conducive to the smooth unfolding of the child stroller.

When the child stroller is in the folded state and the unfolded state, the unlocking movable part 5 does not generate an axial driving force on the linkage unlocking part 4, and the linkage unlocking part 4 remains away from the seat locking mechanism 22 and the frame locking mechanism 14; and during the process of the backrest part 3 flipping backward relative to the seat part 2 to unfold, the process of the seat part 2 rotating relative to the frame 1 to unfold, and the process of the frame 1 to unfold, the linkage unlocking part 4 is always away from the seat locking mechanism 22 and the frame locking mechanism 14, so that the child stroller can be unfolded and used smoothly no matter how it is unfolded.

As shown in Figs. 6 and 7, an unlocking drive member 30 is provided at the lower end of the backrest 3. The unlocking drive member 30 has an unlocking drive inclined portion 301 and a pushing portion 302. The unlocking drive inclined portion 301 is a local annular inclined block concentrically arranged with the lower end of the backrest 3, and the pushing portion 302 is located at the rear edge of the highest point of the unlocking drive inclined portion 301. When the backrest 3 is turned forward relative to the seat 2 and folded, the unlocking drive inclined portion 301 pushes the end of the unlocking movable member 5, so that the linkage unlocking member 4 is subjected to the axial driving force of the unlocking movable member 5 and moves toward the frame locking mechanism 14 to perform linkage unlocking, and finally the unlocking drive member 30 passes over the unlocking movable member 5 to achieve complete folding of the backrest, the unlocking drive inclined portion 301 no longer pushes the unlocking movable member 5, and the unlocking movable member 5 no longer applies an axial driving force to the linkage unlocking member 4, and at the same time, the pushing elastic member acts on the linkage unlocking member 4 to reset and move away from the seat locking mechanism 22 and the frame locking mechanism 14.

When the backrest 3 is flipped backwards and unfolded relative to the seat 2, the pushing portion 302 pushes the side of the unlocking movable member 5 and forces the unlocking movable member 5 to rotate and fold relative to the linkage unlocking member 4 to avoid it. At this time, the linkage unlocking member 4 is subjected to a relatively small axial driving force of the unlocking movable member 5, and the axial driving force is smaller than the elastic thrust of the pushing elastic member on the linkage unlocking member 4, so the linkage unlocking member 4 cannot move axially toward the seat locking mechanism 22 and the frame locking mechanism 14. When the backrest 3 continues to flip backwards and unfold relative to the seat 2, until the unlocking driving member 30 stops pushing the unlocking movable member 5, the unlocking movable member 5 automatically resets and unfolds, so that the end of the unlocking movable member 5 faces the inner side wall of the lower end of the backrest 3, so that when the backrest 3 is folded again, the unlocking driving inclined portion 301 can push the end of the unlocking movable member 5 again.

In order to realize automatic resetting of the unlocking movable part 5, one end of the unlocking movable part 5 is rotatably and eccentrically connected to the linkage unlocking part 4 through a pivot, and an unfolding elastic part 51 is provided between the unlocking movable part 5 and the linkage unlocking part 4 for keeping the unlocking movable part 5 elastically unfolded relative to the linkage unlocking part 4. When the unlocking movable part 5 is unfolded, its central axis is parallel to the central axis of the linkage unlocking part 4, and when the backrest part 3 is flipped forward and folded relative to the seat part 2, the other end of the unlocking movable part 5 is pushed by the unlocking driving inclined part 301, and the pushing part 302 moves from one side of the unlocking movable part 5 to the other side and passes over the unlocking movable part 5, so that the unlocking movable part 5 has no axial driving force on the linkage unlocking part 4.

As shown in Figs. 6-9, the unlocking movable member 5 can be folded elastically in one direction relative to the linkage unlocking member 4. The linkage unlocking member 4 has a flip groove. One end of the unlocking movable member 5 is pivotally connected to the flip groove. The linkage unlocking member 4 is provided with a movable blocking structure 6 so that the unlocking movable member 5 is limited when it is unfolded relative to the linkage unlocking member 4. In this embodiment, the movable blocking structure 6 is a retaining edge extending from the bottom side of the flip groove. When the unlocking movable member 5 is unfolded relative to the linkage unlocking member 4, one side of the unlocking movable member 5 abuts against the retaining edge and is restricted from continuing to rotate.

As shown in FIGS. 6 and 7 , in order to ensure reliable and quick locking and folding and unfolding, the frame locking mechanism 14 is located between the upper end of the rear foot rod 12 and the lower end of the push rod 13, and the frame locking mechanism 14 is used to lock the push rod 13 in the unfolded state relative to the rear foot rod 12; the front foot rod 11 is configured to be synchronously rotated and unfolded or synchronously rotated and folded with the push rod 13 relative to the rear foot rod 12; the frame locking mechanism 14 includes frame locking tooth grooves that are both arranged on the opposite sides of the upper end of the rear foot rod 12 and the lower end of the push rod 13 141, a frame locking gear 142 is slidably provided between the upper end of the rear foot rod 12 and the lower end of the push rod 13, and can be simultaneously engaged with the frame locking tooth groove 141 of the upper end of the rear foot rod 12 and the lower end of the push rod 13; a frame locking gear reset member 143 is provided between the frame locking gear 142 and the upper end of the rear foot rod 12 for driving the frame locking gear 142 to elastically reset; the frame locking gear 142 can be linked with the linkage unlocking member 4 to disengage from the frame locking tooth groove 141 at the lower end of the push rod 13.

Specifically, the upper end of the front foot rod 11 is rotatably connected to the upper end of the rear foot rod 12 through a pivot, the connection pivot between the front foot rod 11 and the rear foot rod 12 deviates from the connection pivot between the push rod 13 and the rear foot rod 12, the upper end of the front foot rod 11 and the lower end of the push rod 13 are synchronously connected through a frame linkage 15, one end of the frame linkage 15 is eccentric to the connection pivot between the front foot rod 11 and the rear foot rod 12 and is hinged to the upper end of the front foot rod 11, and the other end of the frame linkage 15 is eccentric to the connection pivot between the push rod 13 and the rear foot rod 12 and is hinged to the lower end of the push rod 13. When the frame locking mechanism 14 is unlocked, the push rod 13 is folded toward the rear foot rod 12. At the same time, the front foot rod 11 rotates around its rear foot rod 12 connection pivot under the action of the frame linkage 15 and synchronously moves closer and folds toward the rear foot rod 12.

As shown in FIGS. 6 and 7 , in order to facilitate the reversal or replacement of the seat part and meet the different usage requirements of users, a seat base 20 fixedly connected to the seat part 2 is provided on one side of the seat part 2, and a seat connecting seat 21 is provided on the frame 1. The seat base 20 can rotate with the seat connecting seat 21 and can be detachably connected thereto. The seat connecting seat 21 is rotatably connected to the frame 1; the seat locking mechanism 22 includes a seat locking tooth groove 221 provided on opposite sides of the seat connecting seat 21 and the lower end of the push rod 13, and a seat connecting seat 21 is provided between the seat connecting seat 21 and the lower end of the push rod 13, which can be simultaneously engaged with the seat connecting seat. 21 and the seat locking gear 222 of the seat locking tooth groove 221 at the lower end of the push rod 13, and a seat locking gear reset member 223 is provided between the seat locking gear 222 and the lower end of the push rod 13 for driving the seat locking gear 222 to elastically reset so as to simultaneously snap into the seat locking tooth groove 221 at the lower end of the connecting seat 21 and the push rod 13; a joint unlocking member 211 is movably provided on the outer surface of the seat connecting seat 21 for pushing the seat locking gear 222 to disengage the seat locking tooth groove 221 of the connecting seat 21, and the joint unlocking member 211 can be unlocked by the linkage unlocking member 4. When the seat part is detached from the frame, the user can also directly operate the joint unlocking member 211 to unlock and fold the frame.

As shown in Figures 6 and 7, the rear side of the seat portion 2 is rotatably connected to an armrest portion 7 located in front of the backrest portion 3, and an armrest locking mechanism 71 is provided between the armrest portion 7 and the seat portion 2 for locking the armrest portion 7 in an unfolded state relative to the seat portion 2. The armrest locking mechanism 71 is configured to be unlocked in conjunction with the unlocking member 4. The armrest portion 7 includes an armrest base 70 rotatably connected to the seat portion 2; the armrest locking mechanism 71 includes an armrest locking slot 711 provided on the armrest base 70 and an armrest sliding seat 712 slidably provided on the seat portion 2, an armrest locking protrusion 7121 for being inserted into the armrest locking slot 711 is provided on the armrest sliding seat 712, and an armrest locking block reset member 713 for driving the armrest sliding seat 712 to elastically reset is provided between the armrest sliding seat 712 and the seat portion 2; when the linkage unlocking member 4 is driven by the unlocking movable member 5 to produce axial movement, the linkage unlocking member 4 first acts on the armrest sliding seat 712, so that the armrest locking protrusion 7121 exits the armrest locking slot 711, and the armrest portion 7 is automatically folded toward the seat portion under the action of gravity.

As shown in Figures 6 and 7, the backrest locking mechanism 31 includes a backrest locking notch 311 provided on the seat portion 2 and a backrest locking slider 312 slidably provided on the backrest portion 3 and capable of being inserted into the backrest locking notch 311, a slider reset member 313 for driving the backrest locking slider 312 to elastically reset is provided between the backrest locking slider 312 and the backrest portion 3, a backrest unlocking button 33 is provided on the backrest portion 3, and a backrest unlocking linkage member 32 for linking the backrest locking slider 312 to disengage from the backrest locking notch 311 is provided between the backrest unlocking button 33 and the backrest locking slider 312.

As shown in Figures 6 and 7, the seat base 20 is relatively fixedly connected to a backrest segment base 201, the lower end of the backrest portion 3 is rotatably connected to the backrest segment base 201, a plurality of backrest locking notches 311 are provided on the backrest segment base 201, and the armrest base 70 is located between the backrest segment base 201 and the seat base 20.

As shown in Figures 6 and 7, the backrest segment base 201 is provided with a sliding through hole for axial sliding of the linkage unlocking member 4, and a guide structure is provided between the inner wall of the sliding through hole and the outer wall of the linkage unlocking member 4. The guide structure includes a guide groove extending axially along the backrest segment base 201 and a guide protrusion cooperating with the guide groove.

How the stroller folds:

The user operates the backrest unlocking button 33 to move relative to the backrest part 3, and the backrest unlocking button 33 drives the backrest locking slider 312 to slide relative to the backrest part 3 through the backrest unlocking linkage part 32, so that the locking end of the backrest locking slider 312 exits the backrest locking notch 311, and then operates the backrest part 3 to flip and fold forward relative to the seat part 2. During the folding process of the backrest part 3, the unlocking driving inclined portion 301 of the unlocking driving member 30 pushes the corresponding end of the unlocking movable member 5, and the unlocking movable member 5 generates an axial driving force on the linkage unlocking member 4, so that the linkage unlocking member 4 moves axially, and the linkage unlocking member 4 successively unlocks the armrest part, the seat part and the frame. Specifically, the linkage unlocking member 4 pushes the armrest sliding seat 712 to move axially, so that the armrest locking protrusion 7121 exits the armrest locking slot 711 to release the locking state of the armrest part 7 relative to the seat part 2; the unlocking linkage push rod 41 of the linkage unlocking member 4 pushes the seat locking gear 222 to move axially through the joint unlocking member 211, so that the seat locking gear 222 exits the seat locking tooth groove 221 of the seat connecting seat 21 to release the locking state of the seat part 2 relative to the frame 1; the unlocking linkage push rod 41 of the linkage unlocking member 4 pushes the frame locking gear 142 to move axially through the joint unlocking member 211, so that the frame locking gear 142 exits the frame locking tooth groove 141 at the lower end of the push rod 13 to release the locking state of the frame 1. Finally, the backrest 3, the armrest part 7, the seat part 2 and the frame 1 can be folded together to achieve the folding work of the child stroller.

After folding, the unlocking drive member 30 completely passes over the end of the unlocking movable member 5. At this time, the unlocking drive inclined portion 301 no longer presses the end of the unlocking movable member 5, so that the linkage unlocking member 4 is not subjected to the axial driving force, and the linkage unlocking member 4 is reset away from the seat locking mechanism and the frame locking mechanism under the elastic force of the pushing elastic member. When unfolding, since the linkage unlocking member is far away from the seat locking mechanism and the frame locking mechanism, the seat locking mechanism and the frame locking mechanism are not subjected to the unlocking action, so the seat part and the frame can be unfolded smoothly, and the user can unfold the whole vehicle smoothly without confirming the unfolding action sequence.

Claims (15)

1. A child stroller that can be folded and unfolded smoothly, the child stroller having a folded state and an unfolded state, characterized by comprising: A frame (1), the frame (1) comprising a front foot rod (11), a rear foot rod (12) and a push rod (13), wherein the upper end of the front foot rod (11), the upper end of the rear foot rod (12) and the lower end of the push rod (13) are rotatably connected; A frame locking mechanism (14), wherein the frame locking mechanism (14) is used to lock the frame (1) in an unfolded state; A seat portion (2), the seat portion (2) being connected to the vehicle frame (1) in a relatively foldable manner; A seat locking mechanism (22), wherein the seat locking mechanism (22) is used to lock the seat portion (2) in an unfolded state relative to the vehicle frame (1); A backrest portion (3), the backrest portion (3) being rotatably connected to the seat portion (2), and a backrest locking mechanism (31) for locking the backrest portion (3) relative to the seat portion (2) in an unfolded state is provided between the backrest portion (3) and the seat portion (2); A linkage unlocking member (4), the linkage unlocking member (4) being used to link the unlocking actions of the seat locking mechanism (22) and the frame locking mechanism (14); An unlocking movable member (5) is connected to a linkage unlocking member (4) in an automatically resettable manner. The unlocking movable member (5) is configured to generate an axial driving force on the linkage unlocking member (4) when the backrest portion (3) is flipped forward relative to the seat portion (2) and folded, so that the linkage unlocking member (4) moves axially to achieve linkage unlocking. When the unlocking movable member (5) is unfolded, the linkage unlocking member (4) is kept away from the seat locking mechanism (22) and the frame locking mechanism (14). 2. A stroller with smooth folding and unfolding according to claim 1, characterized in that the linkage unlocking member (4) is configured to always be subjected to an elastic thrust toward the unlocking movable member (5); during the process of the backrest (3) being flipped forward relative to the seat part (2) and folded, the axial driving force generated by the unlocking movable member (5) on the linkage unlocking member (4) is greater than the elastic thrust received by the linkage unlocking member (4); and during the process of the backrest (3) being flipped backward relative to the seat part (2) and unfolded, the axial driving force generated by the unlocking movable member (5) on the linkage unlocking member (4) is less than the elastic thrust received by the linkage unlocking member (4). 3. A stroller with smooth folding and unfolding according to claim 1, characterized in that when the stroller is in the folded state and the unfolded state, the unlocking movable part (5) does not generate an axial driving force on the linkage unlocking part (4); and during the process of the backrest part (3) flipping backward relative to the seat part (2) to unfold, the process of the seat part (2) rotating relative to the frame (1) to unfold, and the process of the frame (1) to unfold, the linkage unlocking part (4) is always away from the seat locking mechanism (22) and the frame locking mechanism (14). 4. A stroller for children with smooth folding and unfolding as claimed in claim 1, characterized in that an unlocking drive member (30) is provided at the lower end of the backrest portion (3), and the unlocking drive member (30) and the unlocking movable member (5) are configured such that: when the backrest portion (3) is flipped forward and folded relative to the seat portion (2), the unlocking drive member (30) presses the end of the unlocking movable member (5), thereby causing the linkage unlocking member (4) to be subjected to the axial driving force of the unlocking movable member (5) and move toward the side of the frame locking mechanism (14) to perform linkage unlocking, and finally the unlocking drive member (30) passes over the unlocking movable member (5); when the backrest portion (3) is flipped backward and unfolded relative to the seat portion (2), the unlocking drive member (30) pushes the side of the unlocking movable member (5), thereby forcing the unlocking movable member (5) to perform an evasive action, thereby causing the linkage unlocking member (4) to remain away from the seat locking mechanism (22) and the frame locking mechanism (14). 5. A stroller with smooth folding and unfolding according to claim 4, characterized in that the unlocking drive member (30) has an unlocking drive inclined portion (301) and a pushing portion (302), and when the backrest portion (3) is flipped forward relative to the seat portion (2) to be folded, the unlocking drive inclined portion (301) pushes the end of the unlocking movable member (5), and when the backrest portion (3) is flipped backward relative to the seat portion (2) to be unfolded, the pushing portion (302) pushes the side of the unlocking movable member (5) to force the unlocking movable member (5) to rotate and fold relative to the linkage unlocking member (4) to avoid it, and when the unlocking drive member (30) stops pushing the unlocking movable member (5), the unlocking movable member (5) automatically returns to its original position and unfolds. 6. A stroller with smooth folding and unfolding as described in claim 5, characterized in that one end of the unlocking movable part (5) is rotatably connected to the linkage unlocking part (4) through a pivot, and an unfolding elastic part (51) is provided between the unlocking movable part (5) and the linkage unlocking part (4) for keeping the unlocking movable part (5) elastically unfolded relative to the linkage unlocking part (4), and when the backrest part (3) is flipped forward and folded relative to the seat part (2), the other end of the unlocking movable part (5) is pushed by the unlocking driving inclined part (301), and the pushing part (302) moves from one side of the unlocking movable part (5) to the other side and passes over the unlocking movable part (5), so that the unlocking movable part (5) finally has no axial driving force on the linkage unlocking part (4). 7. A child stroller that can be folded and unfolded smoothly according to claim 1, characterized in that a movable blocking structure (6) is provided between the unlocking movable part (5) and the linkage unlocking part (4) for limiting the position of the unlocking movable part (5) when the unlocking movable part (5) is unfolded relative to the linkage unlocking part (4). 8. A child stroller that can be smoothly folded and unfolded according to any one of claims 1 to 7, characterized in that the frame locking mechanism (14) is located between the upper end of the rear foot rod (12) and the lower end of the push rod (13), and the frame locking mechanism (14) is used to lock the push rod (13) in an unfolded state relative to the rear foot rod (12); the front foot rod (11) is configured to rotate and unfold synchronously with the push rod (13) relative to the rear foot rod (12) or to fold synchronously. 9. A stroller for children that can be folded and unfolded smoothly according to claim 8, characterized in that the frame locking mechanism (14) includes frame locking tooth grooves (141) that are arranged on opposite sides of the upper end of the rear foot rod (12) and the lower end of the push rod (13), and a frame locking gear (142) that can be slidably provided between the upper end of the rear foot rod (12) and the lower end of the push rod (13) and can simultaneously engage with the frame locking tooth grooves (141) of the upper end of the rear foot rod (12) and the lower end of the push rod (13), and a frame locking gear reset member (143) for driving the frame locking gear (142) to elastically reset is provided between the frame locking gear (142) and the upper end of the rear foot rod (12); the frame locking gear (142) can be disengaged from the frame locking tooth groove (141) at the lower end of the push rod (13) by the linkage unlocking member (4). 10. A stroller for children that can be folded and unfolded smoothly according to claim 8, characterized in that the upper end of the front foot rod (11) is rotatably connected to the upper end of the rear foot rod (12) through a pivot, the connecting pivot between the front foot rod (11) and the rear foot rod (12) deviates from the connecting pivot between the push rod (13) and the rear foot rod (12), the upper end of the front foot rod (11) and the lower end of the push rod (13) are connected in a synchronous manner through a frame linkage (15), one end of the frame linkage (15) is eccentric to the connecting pivot between the front foot rod (11) and the rear foot rod (12) and is hinged to the upper end of the front foot rod (11), and the other end of the frame linkage (15) is eccentric to the connecting pivot between the push rod (13) and the rear foot rod (12) and is hinged to the lower end of the push rod (13). 11. A child stroller that can be folded and unfolded smoothly according to any one of claims 1 to 7, characterized in that a seat base (20) fixedly connected to the seat portion (2) is provided on one side of the seat portion (2), and the seat base (20) is detachably connected to the frame (1). 12. A stroller for children that can be folded and unfolded smoothly according to claim 11, characterized in that a seat connecting seat (21) is provided between the seat base (20) and the frame (1), the seat base (20) can rotate with the seat connecting seat (21) and can be detachably connected thereto, and the seat connecting seat (21) can be rotatably connected to the frame (1); the seat locking mechanism (22) includes a seat locking tooth groove (221) provided on opposite sides of the seat connecting seat (21) and the lower end of the push rod (13), and a locking member (221) is provided between the seat connecting seat (21) and the lower end of the push rod (13) that can simultaneously engage with the lower ends of the seat connecting seat (21) and the push rod (13). A seat locking gear (222) is provided between the seat locking gear (222) and the lower end of the push rod (13), and a seat locking gear reset member (223) is provided between the seat locking gear (222) and the lower end of the push rod (13) for driving the seat locking gear (222) to elastically reset so as to simultaneously engage with the seat locking gear groove (221) of the connecting seat (21) and the lower end of the push rod (13); a joint unlocking member (211) is movably provided on the outer surface of the seat connecting seat (21) for pushing the seat locking gear (222) to disengage from the seat locking gear groove (221) of the connecting seat (21), and the joint unlocking member (211) can be linked to an unlocking action by a linkage unlocking member (4). 13. A child stroller that can be folded and unfolded smoothly according to any one of claims 1-7, characterized in that the rear side of the seat part (2) is rotatably connected to an armrest part (7) located in front of the backrest part (3), and an armrest locking mechanism (71) is provided between the armrest part (7) and the seat part (2) for locking the armrest part (7) in an unfolded state relative to the seat part (2), and the armrest locking mechanism (71) is configured to be unlocked in conjunction with a linked unlocking member (4). 14. A child stroller that can be folded and unfolded smoothly according to claim 13, characterized in that the armrest portion (7) includes an armrest base (70) rotatably connected to the seat portion (2); the armrest locking mechanism (71) includes an armrest locking slot (711) provided on the armrest base (70) and an armrest sliding seat (712) slidably provided on the seat portion (2), an armrest locking protrusion (7121) for being inserted into the armrest locking slot (711) is provided on the armrest sliding seat (712), and an armrest locking block reset member (713) for driving the armrest sliding seat (712) to elastically reset is provided between the armrest sliding seat (712) and the seat portion (2); the armrest sliding seat (712) is configured to be linked to an unlocking action by a linked unlocking member (4). 15. A stroller for children that can be folded and unfolded smoothly according to any one of claims 1 to 7, characterized in that the backrest locking mechanism (31) includes a backrest locking notch (311) provided on the seat part (2) and a backrest locking slider (312) slidably provided on the backrest part (3) and capable of being inserted into the backrest locking notch (311), a slider reset member (313) for driving the backrest locking slider (312) to elastically reset is provided between the backrest locking slider (312) and the backrest part (3), a backrest unlocking button (33) is provided on the backrest part (3), and a backrest unlocking linkage member (32) for linking the backrest locking slider (312) to disengage from the backrest locking notch (311) is provided between the backrest unlocking button (33) and the backrest locking slider (312).