Pull rod mechanism and cart

Abstract

The invention relates to a pull rod mechanism which comprises a third connecting base. The rotating part is connected to the third connecting seat and can pivot between a first pivoting position and a second pivoting position relative to the third connecting seat; one end of the pull rod is connected to the rotating part, and when the rotating part is pivoted to the first pivoting position, the pull rod is pivoted to the vertical position; when the rotating part is pivoted to the second pivoting position, the pull rod is pivoted to the lying position; and the first positioning piece is arranged between the third connecting seat and the rotating part, and the first positioning piece is configured to limit pivoting of the rotating part.

Description

Technical Field

[0001] The present application relates to the technical field of baby carriages, and particularly to a drawbar mechanism and a stroller. Background Art

[0002] Strollers, such as camping strollers, baby strollers, etc., are favored by consumers because they can not only be used for infants and young children to ride, but also carry items. However, strollers on the market often have problems of being unable to be folded or inconvenient to fold. Generally, in order to facilitate use, a drawbar is provided on the stroller to facilitate the user to pull the stroller. However, the drawbars of strollers on the market are not convenient for users to operate, and it is necessary to design a new drawbar mechanism and a stroller having the same. In addition, generally, seat devices for children to ride, such as safety seats, carrycots, etc., can also be installed on the stroller. However, the seat fixing mechanisms in strollers on the market are complex in structure, and when the seat device is not installed, the seat fixing mechanism cannot be folded, which affects the use and folding of the stroller. Summary of the Invention

[0003] Based on this, it is necessary to provide a frame that can be quickly folded, a drawbar mechanism that is convenient for users to operate, a seat fixing mechanism that is simple in structure and easy to fold, and a stroller for at least one of the above technical problems.

[0004] According to one aspect of the present application, a frame is provided, including: a chassis; a front foot rod, the lower end of the front foot rod is pivotally connected to the chassis; a rear foot rod, the lower end of the rear foot rod is pivotally connected to the chassis; and a handlebar, the lower end of the handlebar is pivotally connected to the upper end of the front foot rod, and the upper end of the rear foot rod is pivotally connected to the handlebar; when the frame is switched from the unfolded state to the folded state, the handlebar pivots relative to the front foot rod, and drives the front foot rod and the rear foot rod to pivot relative to the chassis, so that the handlebar, the front foot rod and the rear foot rod are folded towards the chassis.

[0005] When the frame according to the embodiment of the present application is folded, the frame can be easily and quickly folded by simply pushing the handlebar.

[0006] In one embodiment, when the frame is switched from the unfolded state to the folded state, the handlebar and the rear foot rod pivot towards the front of the frame, and the front foot rod pivots towards the rear of the frame.

[0007] In one embodiment, when the frame is switched from the unfolded state to the folded state, the included angle between the handlebar and the rear foot rod gradually decreases.

[0008] 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 configured to lock the rider and the front foot bar to prevent relative pivoting between the rider and the front foot bar; and an unlocking mechanism disposed on the rider and configured to unlock the locking of the locking joint on the rider and the front foot bar to allow relative pivoting between the rider and the front foot bar.

[0009] In one embodiment, the locking joint includes: a first connecting seat, the upper end of the first connecting seat being connected to the rider; a second connecting seat, the lower end of the second connecting seat being connected to the front foot bar, the second connecting seat being pivotally connected to the first connecting seat; and a locking member disposed in the first connecting seat and having a locking position in which the locking member locks the first connecting seat and the second connecting seat to prevent relative pivoting between the first connecting seat and the second connecting seat.

[0010] In one embodiment, the unlocking mechanism includes: an unlocking operating member disposed on the rider and operatively connected to the locking member, the unlocking operating member configured to drive the locking member to slide to an unlocking position to unlock the locking of the locking member on the first connecting seat and the second connecting seat and allow relative pivoting between the first connecting seat and the second connecting seat.

[0011] In one embodiment, the locking joint further includes: a first restoring member fixed in the first connecting seat and abutting against the locking member, the first restoring member configured to cause the locking member to have a tendency to slide to the locking position.

[0012] In one embodiment, the unlocking mechanism further includes: a first connecting member, one end of the first connecting member being connected to the unlocking operating member and the other end of the first connecting member being connected to the locking member, the unlocking operating member driving the locking member to slide to the unlocking position through the first connecting member.

[0013] In one embodiment, a first locking groove and a first locking protrusion are formed at one end of the second connecting seat, 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 locking position, the second locking protrusion is engaged in the first locking groove, and the first locking protrusion is engaged in the second locking groove.

[0014] In one embodiment, the frame further includes a support frame pivotally connected to the locking joint.

[0015] In one embodiment, the frame further includes 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 foot bar. The pivot point of the rear foot bar and the rider is located on the side of the rider facing the inside of the frame, and the projection of the pivot trajectory of the rear foot bar along the height direction does not overlap with the projection of the pivot trajectory of the front foot bar and / or the rider along the height direction.

[0016] In one embodiment, when the frame is switched from the deployed state to the retracted state, the linkage rod pivots towards the rear of the frame, and the rear foot rod pivots towards the front of the frame, and the angle between the linkage rod and the rear foot rod gradually increases.

[0017] In one embodiment, the frame further includes a support frame pivotally connected to the rider.

[0018] In one embodiment, the frame further includes a linkage rod. One end of the linkage rod is pivotally connected to the support frame, and the other end of the linkage rod is pivotally connected to the front foot rod. The pivot point of the rear foot rod and the rider is located below the rider in the height direction, and the projection of the pivot trajectory of the rear foot rod along the height direction at least partially overlaps with the pivot trajectory of the front foot rod and / or the projection of the rider along the height direction.

[0019] In one embodiment, when the frame is switched from the deployed state to the retracted state, the linkage rod pivots towards the rear of the frame, and the rear foot rod pivots towards the front of the frame, and the angle between the linkage rod and the rear foot rod gradually increases.

[0020] In one embodiment, the underframe includes: two first rods extending substantially along the length direction. A first bending portion protruding towards the inside of the frame is formed on the first rod to form a first avoidance space. When the frame is in the retracted state, at least a part of the front foot rod is located in the first avoidance space.

[0021] In one embodiment, a second bending portion protruding towards the rear of the frame is formed on the rear foot rod to form a second avoidance space. When the frame is in the retracted state, at least a part of the rider is located in the second avoidance space.

[0022] In one embodiment, the underframe further includes: two second rods extending substantially along the width direction. The two first rods and the two second rods form a substantially rectangular structure. A second strengthening rod is disposed between the two first rods, and two ends of the second strengthening rod are respectively connected to the first bending portions of the two first rods.

[0023] In one embodiment, the underframe includes: two first rods extending substantially along the length direction; two second rods extending substantially along the width direction; and at least one first strengthening rod disposed between the two first rods.

[0024] According to another aspect of the present application, there is provided a stroller including a frame according to at least one of the foregoing embodiments.

[0025] When the stroller according to the embodiment of the present application is retracted, the frame of the stroller can be easily and quickly retracted by simply pushing the rider.

[0026] According to another aspect of the present application, a drawbar mechanism is provided, including: a third connecting seat; a rotating part, which is connected to the third connecting seat and can pivot relative to the third connecting seat between a first pivot position and a second pivot position; a drawbar, one end of the drawbar is connected to the rotating part. When the rotating part pivots to the first pivot position, the drawbar pivots to the upright position; when the rotating part pivots to the second pivot position, the drawbar pivots to the lying position; and a first positioning member, which is arranged between the third connecting seat and the rotating part, and the first positioning member is configured to limit the pivoting of the rotating part.

[0027] The drawbar mechanism according to the embodiment of the present application can easily adjust and position the use position, realize the adjustment of the use angle of the drawbar, and is convenient to operate and has wide applicability.

[0028] In one embodiment, the first positioning member is a damping piece, and the damping piece is clamped between the rotating part and the third connecting seat.

[0029] In one embodiment, one end of the third connecting seat is recessed inward to form a pivot space, at least a part of the rotating part is received in the pivot space, and the damping piece is clamped between the rotating part and the side wall of the pivot space.

[0030] In one embodiment, the pivot space includes two relatively arranged side walls, at least a part of the rotating part is located between the two side walls of the pivot space, the first positioning member includes two damping pieces, and the two damping pieces are respectively clamped between the two side walls of the pivot space and the rotating part.

[0031] In one embodiment, the first positioning member includes: a positioning recess, which is arranged on one of the rotating part and the third connecting seat; and a positioning protrusion, which is arranged on the other of the rotating part and the third connecting seat. When the positioning recess enters the positioning protrusion, the pivoting of the rotating part is restricted by the shape matching of the positioning recess and the positioning protrusion.

[0032] In one embodiment, one end of the third connecting seat is recessed inward to form a pivot space, at least a part of the rotating part is received 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; at least one elastic finger is provided on one of the surface of the rotating part and the side wall of the pivot space, and a plurality of positioning recesses are provided on the other of the surface of the rotating part and the side wall of the pivot space. The positioning protrusion is arranged on the side of the elastic finger facing the positioning recess, and the positioning protrusion is engaged with one of the plurality of positioning recesses to position the drawbar at one of the plurality of pivot angles.

[0033] In one embodiment, one end of the third connecting seat is recessed inward to form a pivoting space, at least a part of the rotating portion is received in the pivoting space, and a limiting groove is provided on the inner wall of the pivoting space of the third connecting seat; a limiting protrusion is provided on the rotating portion, and the limiting protrusion slides in the limiting groove as the rotating portion pivots. Wherein, when the rotating portion pivots from the first pivoting position to the second pivoting position, the limiting protrusion abuts against the side wall of the limiting groove to limit the continuous pivoting of the rotating portion.

[0034] In one embodiment, the pull rod mechanism further includes: a slide rail, the third connecting seat is connected to the slide rail and can slide along the slide 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 retracted position.

[0035] In one embodiment, the pull rod mechanism further includes: a locking device, which is arranged on the third connecting seat and the slide rail, and the locking device is used to lock the third connecting seat at the first sliding position and / or the second sliding position.

[0036] In one embodiment, the third connecting seat is provided with a first through hole that is slidably sleeved 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 on the part of the slide rail corresponding to the first sliding position of the third connecting seat; a second positioning member, which is arranged in the slide rail, and at least a part of the second positioning member is slidable 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 part of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat at the first sliding position.

[0037] In one embodiment, the third connecting seat is provided with a first through hole that is slidably sleeved 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 on the part of the slide rail corresponding to the second sliding position of the third connecting seat; a third positioning member, which is arranged in the slide rail, and at least a part of the third positioning member is slidable in the third positioning hole to retract and protrude from the third positioning hole; when the third connecting seat slides to the second sliding position, at least a part of the third positioning member protrudes from the third positioning hole and enters the second through hole to lock the third connecting seat at the second sliding position.

[0038] In one embodiment, the pull rod mechanism further includes: a fixing portion, the slide rail is connected to the fixing portion, and when the rotating portion pivots from the second pivoting position to the first pivoting position, the pull rod abuts against the front surface of the fixing portion to limit the continuous pivoting of the rotating portion.

[0039] In one embodiment, the rotating part includes: a main body which is arranged in a substantially cylindrical structure; and a connecting end which is arranged as a boss protruding from the cylindrical curved surface of the main body, and the boss is provided with a first connecting hole, and one end of the pull rod is inserted into the first connecting hole.

[0040] In one embodiment, one end of the third connecting seat is recessed inward to form a pivoting space, and the shape of the pivoting space is arranged as a substantially cylindrical shape matching the shape of the main body of the rotating part, and the main body of the rotating part is pivotally arranged in the pivoting space.

[0041] In one embodiment, the other end of the third connecting seat is provided with a first through hole, and the first through hole is slidably sleeved on the slide rail.

[0042] In one embodiment, the side wall of the first through hole is provided with a second through hole; a part of the slide rail corresponding to the first sliding position of the third connecting seat is provided with a second positioning hole, and a second positioning member is arranged in the slide rail, and at least a part of the second positioning member is slidable 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 part of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat at the first sliding position.

[0043] In one embodiment, the second positioning member is a spring piece, and the spring piece has a first convex post which is slidable in the second positioning hole.

[0044] In one embodiment, the side wall of the first through hole is provided with a second through hole. A part of the slide rail corresponding to the second sliding position of the third connecting seat is provided with a third positioning hole, and a third positioning member is arranged in the slide rail, and at least a part of the third positioning member is slidable in the third positioning hole to retract and protrude from the third positioning hole. When the third connecting seat slides to the second sliding position, at least a part of the third positioning member protrudes from the third positioning hole and enters the second through hole to lock the third connecting seat at the second sliding position.

[0045] In one embodiment, the third positioning member is a spring piece, and the spring piece has a second convex post which is slidable in the third positioning hole.

[0046] In one embodiment, a limiting convex is arranged on the cylindrical curved surface of the main body of the rotating part. A limiting groove is arranged on the inner wall of the pivoting space of the third connecting seat, and when the rotating part pivots, the limiting convex slides in the limiting groove. When the rotating part pivots from the first pivoting position to the second pivoting position, the limiting convex abuts against the side wall of the limiting groove to limit the continuous pivoting of the rotating part.

[0047] In one embodiment, the pull rod mechanism further includes: a fixing part, and the slide rail is connected to the fixing part. When the rotating part pivots from the second pivoting position to the first pivoting position, the pull rod abuts against the front surface of the fixing part to limit the continuous pivoting of the rotating part.

[0048] In one embodiment, the drawbar mechanism further includes: a front rod; and a rear rod. A fixing portion is respectively fixed on the front rod and the rear rod, and two 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 drawbar abuts against the front surface of the fixing portion fixed on the front rod to limit the further pivoting of the rotating portion.

[0049] In one embodiment, the drawbar mechanism further includes: at least one receiving member. The receiving member is arranged on the front rod, and a receiving groove is arranged in the receiving member. When the drawbar slides to the receiving position, at least a part of the drawbar is received in the receiving groove.

[0050] In one embodiment, the drawbar includes: a connecting rod, one end of the connecting rod is connected to the rotating portion; and a handle, the handle is connected to the other end of the connecting rod. When the drawbar slides to the receiving position, the handle is received in the receiving groove.

[0051] In one embodiment, two receiving members are provided. The two receiving members are spaced apart by a fixing portion arranged on the front rod, and the openings of the receiving grooves of the two receiving members are arranged opposite to each other.

[0052] In one embodiment, one receiving member is provided. The receiving member is arranged on the lower side of the fixing portion, and the opening of the receiving groove of the receiving member faces the front of the fixing portion.

[0053] In one embodiment, the first positioning member is a damping sheet. The damping sheet is clamped between the end face of the main body of the rotating portion and the inner surface facing the rotating portion of the side wall of the pivot space.

[0054] In one embodiment, the damping sheet is a flexible member.

[0055] In one embodiment, the material of the damping sheet includes at least one of soft colloid, rubber material, and plastic material.

[0056] In one embodiment, the first positioning member includes: a positioning concave, the positioning concave is arranged on one of the end face of the main body of the rotating portion and the inner wall of the pivot space; and a positioning convex, the positioning convex is arranged on the other of the end face of the main body of the rotating portion and the inner wall of the pivot space. When the positioning concave enters the positioning convex, the pivoting of the rotating portion is restricted by the shape matching of the positioning concave and the positioning convex.

[0057] According to another aspect of the present application, there is provided a trolley, including: a chassis, and the drawbar mechanism in the foregoing embodiment. The drawbar mechanism is connected to the chassis.

[0058] The drawbar mechanism of the trolley according to the embodiment of the present application can easily adjust and position the use position, realize the adjustment of the use angle of the drawbar, and is convenient to operate and has wide applicability.

[0059] According to one aspect of the present application, a seat fixing mechanism is provided, including: a fixed seat; and a clamping seat, the clamping seat is slidably connected to the fixed seat, and the clamping seat can move between a retracted position and an extended position relative to the fixed seat, and the clamping seat is farther away from the fixed seat when it is in the extended position than when it is in the retracted position.

[0060] The seat fixing mechanism according to the embodiment of the present application has a simple structure, is easy to retract, and will not interfere with other components of the stroller. In one embodiment, the clamping seat includes: a joint portion configured to be inserted into a joint groove of the seat; and a base portion connected to the joint portion and pivotally connected to the fixed seat. There is an arc-shaped transition region between the joint portion and the base portion, and the width of the joint portion is smaller than the width of the base portion.

[0061] In one embodiment, a first clamping hole is provided at the upper end of the joint portion; and / or a second clamping hole is provided at the lower end of the base portion.

[0062] In one embodiment, the fixed seat is provided with a connecting end portion, and the clamping seat is provided with a third connecting groove, and the connecting end portion is inserted into the third connecting groove to pivotally connect the fixed seat and the clamping seat.

[0063] In one embodiment, at least one first convex portion and at least one first concave portion are formed at one end of the connecting end portion facing the clamping seat, a first inclined surface is provided between the first convex portion and the first concave portion, at least one second convex portion and at least one second concave portion are formed on the bottom wall of the third connecting groove, a second inclined surface is provided between the second convex portion and the second concave portion. When the clamping seat is in the retracted position, the second convex portion is fitted in the first concave portion, and the first convex portion is fitted in the second concave portion. When the clamping seat pivots from the retracted position to the extended position, the first convex portion disengages from the second concave portion, and through the cooperation of the second inclined surface and the first inclined surface, the first convex portion slides to a position where it abuts against the second convex portion, and the clamping seat slides in a direction away from the fixed seat.

[0064] In one embodiment, two opposite first convex portions and two opposite first concave portions are formed at one end of the connecting end portion facing the clamping seat, the two first convex portions are separated by the two first concave portions, and a first inclined surface is provided between the adjacent first convex portion and the first concave portion. Two opposite second convex portions and two opposite second concave portions are formed on the bottom wall of the third connecting groove, the two second convex portions are separated by the two second concave portions, and a second inclined surface is provided between the adjacent second convex portion and the second concave portion. When the clamping seat is in the retracted position, the two second convex portions are respectively fitted in the two first concave portions, and the two first convex portions are respectively fitted in the two second concave portions. When the clamping seat pivots from the retracted position to the extended position, the first convex portion disengages from the second concave portion, and through the cooperation of the second inclined surface and the first inclined surface, the first convex portion slides to a position where it abuts against the second convex portion, and the clamping seat slides in a direction away from the fixed seat.

[0065] In one embodiment, the engaging seat is provided with a mounting through-hole, in which an end cap and a first elastic member are arranged. The end cap 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 cap. The first elastic member continuously applies pressure to the engaging seat, such that the engaging seat has a tendency to slide towards the fixed seat.

[0066] In one embodiment, the connecting end portion is provided with a locking hole. The engaging seat includes a unlocking operation member. When the engaging seat pivots to the deployed position, at least a part of the unlocking operation member enters the locking hole to lock the engaging seat in the deployed position.

[0067] In one embodiment, the engaging seat includes a mounting cavity, and the unlocking operation member is slidably arranged in the mounting cavity. The unlocking operation member includes: a locking portion which enters the locking hole to lock the engaging seat in the deployed position when the engaging seat pivots to the deployed position; and a pressing portion which is connected to the locking portion. By applying pressure to the pressing portion, the unlocking operation member slides in a direction away from the locking hole, such that the locking portion disengages from the locking hole to release the locking of the engaging seat.

[0068] In one embodiment, the engaging seat includes a second elastic member. One end of the second elastic member is fixed in the mounting cavity, and the other end of the second elastic member abuts against the unlocking operation member. The second elastic member continuously applies pressure to the unlocking operation member, such that the unlocking operation member has a tendency to slide towards the third connecting groove.

[0069] 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. The engaging seat can pivot around the pivot shaft and slide along the axial direction of the pivot shaft. When the engaging seat pivots to the retracted position, in the height direction, the engaging seat does not protrude above the upper surface of the fixed seat.

[0070] In one embodiment, one of the fixed seat and the engaging seat is further provided with a limiting portion, and the other of the fixed seat and the engaging seat is further provided with a limiting hole. When the engaging seat pivots to the retracted state, the limiting portion is engaged in the limiting hole.

[0071] In one embodiment, one of the fixed seat and the engaging seat is further provided with an arc-shaped connecting body, and the other of the fixed seat and the engaging seat is further provided with a groove body. The shape of the groove body matches the shape of the connecting body. When the engaging seat pivots to the deployed state, the connecting body is fitted in the groove body.

[0072] In one embodiment, one of the connecting body and the groove body is provided with a limiting recess, and the other of the connecting body and the groove body is provided with a limiting member. When the engaging seat pivots to the deployed state, the limiting member is engaged in the limiting recess to lock the engaging seat in the deployed position.

[0073] In one embodiment, the connector is provided with a first connection groove and a first connection edge, and the groove body is provided with a second connection groove and a second connection edge. When the engaging seat pivots to the unfolded state, the second connection groove receives the first connection edge, and the second connection edge enters the first connection groove.

[0074] In one embodiment, a third elastic member is disposed between the fixed 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 fixed seat.

[0075] According to another aspect of the present application, a trolley is provided, including: the seat fixing mechanism in the foregoing embodiment; a support frame, on which the seat fixing mechanism is fixed; and a seat, which is detachably fixed to the seat fixing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Through the more specific description of the preferred embodiments of the present invention shown in the drawings, the above and other objects, features and advantages of the present invention will become clearer. The same reference numerals indicate the same parts in all the drawings, and the drawings are not deliberately drawn to scale in actual size, and the emphasis is on showing the gist of the present invention.

[0077] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0078] Figure 1 is a perspective view of a vehicle frame in an unfolded state according to an embodiment of the present application.

[0079] Figure 2 is Figure 1 a side view of the vehicle frame shown.

[0080] Figure 3 is Figure 1 a side view of the vehicle frame shown, wherein the sunshade is in a retracted state and the pull rod is in a stored state.

[0081] Figure 4 is Figure 1 a side view of the vehicle frame shown, wherein the rider and the rear footrest start to pivot forward toward the front of the vehicle frame, and the front footrest starts to pivot backward toward the rear of the vehicle frame.

[0082] Figure 5 is Figure 1 a side view of the vehicle frame shown, wherein the rider and the rear footrest further pivot forward toward the front of the vehicle frame, and the front footrest further pivots backward toward the rear of the vehicle frame.

[0083] Figure 6 is Figure 1 a side view of the vehicle frame shown, wherein the vehicle frame has been switched to the folded state.

[0084] Figure 7 is a partial cross-sectional view of the push handle of the frame according to an embodiment of the present application from a perspective view.

[0085] Figure 8 is a partial cross-sectional view of the rider of the frame according to an embodiment of the present application from a side view.

[0086] Figure 9 is a perspective view of the frame in the deployed state according to an embodiment of the present application.

[0087] Figure 10 is Figure 9 a side view of the frame shown.

[0088] Figure 11 is Figure 9 a side view of the frame shown, wherein the awning is in the retracted state, the pull rod is in the stowed state and the rider starts to pivot towards the front of the frame, and the front foot rod starts to pivot towards the rear of the frame.

[0089] Figure 12 is Figure 9 a side view of the frame shown, wherein the rider further pivots towards the front of the frame, the rear foot rod starts to pivot towards the front of the frame, and the front foot rod further pivots towards the rear of the frame.

[0090] Figure 13 is Figure 9 a side view of the frame shown, wherein the frame has been switched to the collapsed state.

[0091] Figure 14 is a partial cross-sectional view of the rider of the frame according to an embodiment of the present application from a side view.

[0092] Figure 15 is a side view of the pushcart according to an embodiment of the present application, showing the pull rod in the upright position.

[0093] Figure 16 is Figure 15 a side view of the pushcart shown, showing the pull rod in the use position.

[0094] Figure 17 is Figure 15 a side view of the pushcart shown, showing the pull rod in the reclined position.

[0095] Figure 18 is a top view of the pull rod mechanism according to an embodiment of the present application.

[0096] Figure 19 is a perspective view of the pushcart according to an embodiment of the present application.

[0097] Figure 20 A perspective view of a trolley according to an embodiment of the present application, showing the handlebar mechanism in a partially disassembled state.

[0098] Figure 21 A perspective view of another angle of the trolley according to an embodiment of the present application, showing the handlebar mechanism in a partially disassembled state.

[0099] Figure 22 A perspective view of a trolley according to an embodiment of the present application, showing the handlebar in the stowed position.

[0100] Figure 23 Is along Figure 19 Partial cross-sectional view taken along line A-A.

[0101] Figure 24 Is along Figure 22 Partial cross-sectional view taken along line B-B.

[0102] Figure 25 A perspective view of a trolley according to an embodiment of the present application, showing the handlebar in the upright position.

[0103] Figure 26 Is Figure 25 Perspective view of the trolley shown, showing the handlebar in the stowed position.

[0104] Figure 27 Is along Figure 26 Partial cross-sectional view taken along line C-C, wherein some structures of the trolley are omitted.

[0105] Figure 28 A perspective view of a handlebar mechanism according to an embodiment of the present application.

[0106] Figure 29 Is along Figure 28 Partially enlarged cross-sectional view of the handlebar mechanism taken along the virtual plane G shown.

[0107] Figure 30 A perspective view of a trolley according to an embodiment of the present application, wherein the engaging seat is in the retracted position.

[0108] Figure 31 A perspective view of a trolley according to an embodiment of the present application, wherein the engaging seat is in the deployed position.

[0109] Figure 32 A side view of a seat fixing mechanism according to an embodiment of the present application, wherein the engaging seat is in the retracted position.

[0110] Figure 33Side view of a seat fixing mechanism according to an embodiment of the present application, where the engaging seat is in the deployed position.

[0111] Figure 34 Top view of a stroller according to an embodiment of the present application, where the engaging seat is in the retracted position.

[0112] Figure 35 Top view of a stroller according to an embodiment of the present application, where the engaging seat is in the deployed position.

[0113] Figure 36 Top view of a stroller with a seat installed according to an embodiment of the present application.

[0114] Figure 37 is Figure 36 Side view of the stroller with a seat installed as shown.

[0115] Figure 38 is along Figure 34 Cross-sectional view of the seat fixing mechanism taken along line I-I, where other structures of the stroller are omitted.

[0116] Figure 39 is along Figure 35 Cross-sectional view of the seat fixing mechanism taken along line J-J, where other structures of the stroller are omitted.

[0117] Figure 40 Partial exploded view of a seat fixing mechanism according to an embodiment of the present application.

[0118] Figure 41 Exploded view of a seat fixing mechanism according to an embodiment of the present application.

[0119] Figure 42 Perspective view of a stroller according to an embodiment of the present application, where the engaging seat is in the retracted position.

[0120] Figure 43 is Figure 42 Enlarged view of part D in

[0121] Figure 44 Perspective view of a stroller according to an embodiment of the present application, where the engaging seat is in the deployed position.

[0122] Figure 45 is Figure 44 Enlarged view of part E in

[0123] Figure 46 Top view of a stroller according to an embodiment of the present application, where the engaging seat is in the retracted position.

[0124] Figure 47Top view of a trolley according to an embodiment of the present application, where the engaging seat is in the deployed position.

[0125] Figure 48 is Figure 46 An enlarged view of part F in

[0126] Figure 49 Partial exploded view of a seat fixing mechanism according to an embodiment of the present application.

[0127] Figure 50 Perspective view of a frame according to an embodiment of the present application.

[0128] Figure 51 Perspective view of a container according to an embodiment of the present application.

[0129] List of reference numerals

[0130] 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 bending part, 1002. Folding hook, 10010. First avoidance space, 12. Rear foot rod, 120. Rear foot seat, 121. Second bending part, 1210. Second avoidance space, 122. Outer convex part, 123. Inner concave part, 13. Support frame, 130. Dining plate assembly, 131. Sunshade assembly, 132. Seat fixing mechanism, 133. Fixed seat, 1331. First elastic part, 1332. Lock hole, 1333. Connecting end part, 13331. First convex part, 13332. First concave part, 13333. First inclined surface, 13334. First connecting shaft, 13335. Limit rib, 1334. Installation groove, 1335. End cover, 134. Clamping seat, 1340. Installation through hole, 1341. Unlocking operation part, 13411. Locking part, 13412. Pin shaft, 13413. Pressing part, 13414. Second elastic part, 1342. Third connecting groove, 13421. Second convex part, 13422. Second concave part, 13423. Second inclined surface, 13424. Protruding part, 13425. Matching hole, 13426. Limit groove, 1343. Installation cavity, 13431. Slide groove, 1344. Cover plate, 1345. Outer shell, 1346. Joint part, 1347. First clamping hole, 1348. Second clamping hole, 1349. Base part, 135. Seat, 14. Rider, 140. Inner rod, 141. Outer rod, 1410. Locking hole, 142. Push handle, 143. Connecting convex, 145. Extension rod, 15. Locking joint, 151. First connecting seat, 1510. First protruding part, 152. Second connecting seat, 1520. First locking groove, 1521. First locking convex, 1522. Second protruding part, 16. Unlocking mechanism, 160. Unlocking operation part, 161. First connecting part, 162. Locking part, 163. First reset part, 1620. Second locking convex, 1621. Second locking groove, 17. Rider length adjustment mechanism, 170. Adjustment button, 171. Second reset part, 172. Second connecting part, 173. Adjustment part, 1730. Straight groove, 1731. Locking part, 1732. Pin, 174. Driving part, 175. Third reset part, 18. Link rod, 19. Pull rod, 190. Handle, 1901. Grip, 1902. Installation part, 191. Connecting rod, 1910. First pivot hole, 192. Rotating part, 1921. Main body, 1922. Connecting end, 19220. First connecting hole, 19221. Receiving cavity, 1923. Limit convex, 1924. Second pivot hole, 193. First positioning part, 1931. Damping piece, 19310. Third pivot hole, 1932. First positioning concave, 194. Third connecting seat, 1941. First through hole1942, Second through-hole, 1943, Fourth pivot hole, 1944, Pivot space, 19440, Limit groove, 19441, Side wall, 1945, First limit protrusion, 195, Pivot pin, 196, Slide rail, 1960, Second positioning member, 1961, Second positioning hole, 19601, First convex column, 1962, Third positioning member, 1963, Third positioning hole, 19621, Second convex column, 197, Storage member, 1970, Storage groove, 198, Fixing part, 1980, Fixing hole, 1981, First fixing part, 1982, Second fixing part, 199, Elastic finger.,

[0131] 2. Tie rod mechanism, 233, Fixed seat, 2330, Connecting body, 2331, First connecting groove, 2332, First connecting edge, 2333, Limiting part, 23331, Elastic member, 23332, Guiding inclined surface, 2334, Limiting concave, 234, Engaging seat, 2340, Groove body, 2341, Second connecting groove, 2342, Second connecting edge, 2343, Mounting hole, 2344, Limiting hole, 2345, Limiting member, 2356, Engaging part, 2347, First engaging hole, 2348, Second engaging hole, 2349, Base, 235, Pivot shaft.

[0132] 3. Placing component, 30, Mounting rack, 301, Outer wall, 302, First protruding part, 303, Second protruding part, 304, First engaging groove, 31, Container, 32, Engaging mechanism, 321, Engaging edge, 322, Locking protrusion, 323, Deformation groove, 324, Second engaging groove, 3241, Guiding part, 3242, Engaging part, 3243, Opening, 33, Support rib.

[0133] 4. Pivot component, 41, First joint, 42, Second joint, 410, Release button.

[0134] D1, Plane, D2, Extension direction, D3, Direction, D4, Direction, H, Height direction, L, Length direction, W, Width direction.

[0135] L1, L2, L1’, L2’, Spacing, α, β, γ, Included angle. Detailed implementation

[0136] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0137] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated therewith, or there may be intervening elements. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0138] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. 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.

[0139] Refer concurrently to Figures 1 to 6 , Figure 1 , which shows a frame 1 according to an embodiment of the present application, including a chassis 10; a front foot bar 11; a rear foot bar 12; and a handle 14. The lower end of the front foot bar 11 is pivotally connected to the chassis 10; the lower end of the rear foot bar 12 is pivotally connected to the chassis 10; the lower end of the handle 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 handle 14. The frame 1 can be switched between an unfolded state (as shown in Figure 1 ) and a folded state (as shown in Figure 6 ). For the sake of convenience of description, terms indicating relative positions are used in the present application, such as "upper", "lower", "front", "rear". These terms indicating relative positions are referenced with the orientation of the frame 1 in the unfolded state. Specifically, the position farther from the support plane of the frame 1 is "upper", and the position relatively closer to the support plane of the frame 1 is "lower". For example, the upper end of the front foot bar 11 refers to the end of the front foot bar 11 that is 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 foot bar 11 refers to the end of the front foot bar 11 that is relatively closer to the support plane of the frame 1 when the frame 1 is in the unfolded state. Specifically, with the end of the frame 1 away from the user when pushing the cart forward through the handle 14 as "front", and the end of the frame 1 relatively closer to the user as "rear". For example, the front of the frame 1 is the left side in Figure 2 , and the rear of the frame 1 is the right side in Figure 2 .

[0140] In Figure 1In the illustrated embodiment, 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 reinforcement 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.

[0141] For reference 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, so that the rider 14, the front leg bar 11, and the rear leg bar 12 collapse toward the base frame 10. Taking the inner angle of the above-mentioned polygonal structure as the angle between the first rod 100, the front foot rod 11, the rear foot rod 12 and the rider 14, during the folding process, the angle between the rider 14 and the rear foot rod 12 (this angle is an acute angle in this embodiment) gradually decreases, the angle between the front foot rod 11 and the bottom frame 10 (this angle is an acute angle in this embodiment) gradually decreases, and the angle between the rear foot rod 12 and the bottom frame 10 (this angle is an acute angle in this embodiment) gradually decreases, thereby, the rider 14, the front foot rod 11 and the rear foot rod 12 gradually approach the bottom frame 10 until, in the height direction H, the rider 14, the front foot rod 11, the rear foot rod 12 and the bottom frame 10 are tightly stacked together, at which point the frame 1 switches to the folded state, as shown in FIG. Figure 6 As shown. Thus, by the rider 14 pivoting relative to the front leg rod 11, the front leg rod 11 and the rear leg rod 12 are driven to pivot and fold relative to the chassis 10, so that the frame can be quickly folded. In this embodiment, compared with the unfolded state (such as Figure 1 Compared with the above, the pivot direction of the rider 14 and the rear foot bar 12 is opposite to the pivot direction of the front foot bar 11. Figure 6The dimensions of the frame 1 (as shown) in the height direction H and the length direction L are significantly reduced, so that it can be easily stored and stowed, for example, stowed in the trunk of a car. Further, due to the significant reduction in the dimensions 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 foot rod 11, and a connecting convex 143 is provided on the handle 14. When the frame 1 is switched to the folded state, the folding hook 1002 can be hooked on the connecting convex 143 to hold the frame 1 in the folded state and prevent accidental unfolding.

[0142] Refer to together Figures 1 to 6 , the frame 1 is further provided with a locking joint 15. The locking joint 15 is connected to the lower end of the handle 14 and the upper end of the front foot rod 11, and the handle 14 and the front foot rod 11 are pivotally connected through 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 handle 14; and the lower end of the second connecting seat 152 is connected to the upper end of the front foot rod 11. The locking joint 15 is configured such that when the frame 1 is in the unfolded 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 handle 14 and the front foot rod 11 and preventing the relative pivoting of the handle 14 and the front foot rod 11, so that the frame 1 is stably held in the unfolded state. When the first connecting seat 151 and the second connecting seat 152 are unlocked, the handle 14 and the front foot rod 11 are allowed to pivot relative to each other, so that the frame 1 can be switched from the unfolded state to the folded state. It should be noted that, optionally, the first connecting seat 151 and the handle 14 are integrally formed and then connected by connection means such as welding or riveting. Optionally, the first connecting seat 151 can also be integrally formed with the handle 14. In such an embodiment, the lower end of the handle 14 and the upper end of the front foot rod 11 are directly connected together during the forming process. Similarly, the second connecting seat 152 can also be integrally formed or integrally formed with the front foot rod 11.

[0143] Refer to Figure 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 relative pivoting of the first connecting seat 151 and the second connecting seat 152.

[0144] Continue to refer to Figure 8, in one embodiment, the locking member 162 can slide along the axial direction of the first connecting seat 151 (the length direction of the rider 14 in this embodiment). One end of the locking member 162 facing the second connecting seat 152 is formed with a second locking protrusion 1620 and a second locking groove 1621. One end of the second connecting seat 152 facing the first connecting seat 151 is formed with a first locking groove 1520 and a first locking protrusion 1521. When the locking member 162 moves to the locking position, the second locking protrusion 1620 is fitted in the first locking groove 1520, and the first locking protrusion 1521 is fitted in the second locking groove 1621. At this time, one side of the first locking protrusion 1521 facing the locking member 162 abuts against the inner wall of the second locking groove 1621, the side wall of the first locking protrusion 1521 abuts against the side wall of the second locking protrusion 1620, and one 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, through the sliding fit between the locking member 162 and the first connecting seat 151, the abutting fit between the second locking protrusion 1620 and the first locking groove 1520, and the abutting fit between the first locking protrusion 1521 and the second locking groove 1621, the locking of the first connecting seat 151 and the second connecting seat 152 is achieved, and the relative pivoting of the first connecting seat 151 and the second connecting seat 152 is blocked. Thus, the rider 14 and the front foot rod 11 are locked, the relative pivoting of the rider 14 and the front foot rod 11 is blocked, and the frame 1 can be stably maintained in the unfolded state.

[0145] 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 on 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 be locked and fitted with the second connecting seat 152.

[0146] In this embodiment, one end of the first connecting seat 151 close to the second connecting seat 152 is provided with a first extension part and a first recess, and one end of the second connecting seat 152 close to the first connecting seat 151 is provided with a second extension part and a second recess. When the first connecting seat 151 and the second connecting seat 152 are locked with each other, the first extension part is received in the second recess, the second extension part is received in the first recess, and the projections of the first extension part and the second extension part along the width direction W overlap. In this embodiment, the rider 14 and the front foot rod 11 have an arc outer peripheral surface, and the first extension part and the second extension part also have an arc outer peripheral surface to connect with the outer shape of the rider 14 and the front foot rod 11. The first locking groove 1520 and the first locking protrusion 1521 are arranged at the end of the second extension part. The locking member 162 is away from the front foot rod 11 relative to the first extension part.

[0147] Refer to together Figures 3 to 5 and Figure 8, Further, the first connecting seat 151 has a first protrusion 1510 protruding from one side of the first extension portion, and the second connecting seat 152 has a second protrusion 1522 protruding from one side of the second extension portion. When the first connecting seat 151 and the second connecting seat 152 are locked to each other, 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 forward relative to the front foot bar 11 towards the frame 1, and the first protrusion 1510 and the second protrusion 1522 are respectively located on the upper edge side of the first extension portion and the second extension portion. When the frame is in the folded state, the rider 14 rotates around this pivot point and folds above the front foot bar 11 (as Figure 6 shown).

[0148] Refer to Figure 1 and Figure 8 together. In one embodiment, the frame 1 is further provided with a unlocking mechanism 16. The unlocking mechanism 16 is configured to unlock the locking of the locking joint 15 on the rider 14 and the front foot bar 11 to allow relative pivoting of the rider 14 and the front foot bar 11. Optionally, the unlocking mechanism 16 can be provided on the rider 14. The unlocking mechanism 16 includes: an unlocking operating member 160 and a first connecting member 161. The unlocking operating member 160 is operably connected to the locking member 162 through the first connecting member 161. Specifically, one end of the first connecting member 161 is connected to the unlocking operating member 160, and the other end of the first connecting member 161 is connected to the locking member 162. The unlocking operating member 160 drives the locking member 162 to move to the unlocking position through the first connecting member 161. It should be noted that the unlocking mechanism 16 can also be provided with a rivet connected to the unlocking operating member 160 and passing through the rider 14. One end of the first connecting member 161 can be connected to the rivet to be connected to the unlocking operating member 160, and the rider 14 can be provided with a long slot for the rivet to slide; or, one end of the first connecting member 161 is directly connected to the unlocking operating member 160, and the rider 14 can also be provided with a long slot for the first connecting member 161 to pass through and slide; or, the unlocking operating member 160 has a connecting portion extending into the inner cavity of the rider 14, and one end of the first connecting member 16 direct ly connects to this connecting portion, and the rider is provided with a long slot for this connecting portion to slide. Specifically, the user pushes and pulls the unlocking operating member 160 to drive the locking member 162 to move to the unlocking position to unlock the locking of the locking joint 15 on the rider 14 and the front foot bar 11, allowing relative pivoting of the rider 14 and the front foot bar 11, and thus allowing the frame 1 to switch from the unfolded state to the folded state. Optionally, as Figure 1As shown, the unlocking operating member 160 can be disposed on the vehicle body 14 near the handgrip 142 for easy operation by the user. Those skilled in the art should understand that disposing the unlocking operating member 160 on the vehicle body 14 near the handgrip 142 is only an optional embodiment of the present application. The unlocking operating member 160 can also be disposed at other suitable positions according to the usage requirements, as long as the locking member 162 can be driven by the unlocking operating member 160 to slide to the unlocking position.

[0149] Reference Figure 8 , in one embodiment, the unlocking operating member 160 is a sliding push button which is sleeved on the vehicle body 14 and can slide along the axial direction (i.e., the length extension direction) of the vehicle body 14. Optionally, the unlocking operating member 160 can also be configured in other forms, such as a button, a knob, etc., as long as the locking member 162 can be driven by the unlocking operating member 160 to slide to the unlocking position. In one embodiment, the first connecting member 161 is a steel wire which is disposed in the inner cavity of the vehicle body 14. Optionally, the first connecting member 161 can also be selected as other forms of connecting members, such as a connecting rod, a connecting piece, a connecting block, etc., as long as the unlocking operating member 160 can be operably connected to the locking member 162.

[0150] Reference Figure 8 , in one embodiment, the locking joint 15 further includes: a first reset member 163. The first reset member 163 is fixed in the first connecting seat 151 and abuts against the locking member 162. The first reset member 163 is configured to make the locking member 162 have a tendency to slide to the locking position. Optionally, the first reset member 163 is a spring which is disposed in the first connecting seat 151. One end of the spring is connected in the first connecting seat 151 (or on the vehicle body 14), and the other end of the spring is connected to the locking member 162. The spring is configured to continuously apply pressure to the locking member 162, so that the locking member 162 has a tendency to slide to the locking position. Optionally, the first reset member 163 can also be selected as other forms of reset mechanisms, such as a leaf spring, a torsion spring, etc., as long as the locking member 162 has a tendency to slide to the locking position.

[0151] Reference Figure 3 , Figure 7 and Figure 8, in one embodiment, the handlebar 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, the other end of the inner rod 140 is sleeved inside the outer rod 141, and the inner rod 140 can slide inside the outer rod 141 to adjust the length and height of the handlebar 14. The frame 1 further includes a handlebar length adjustment mechanism 17, which is operably connected to the inner rod 140 and the outer rod 141 to lock the relative positions 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.

[0152] In Figure 7 and Figure 8 the illustrated embodiment, the handlebar length adjustment mechanism 17 includes: an adjustment button 170; a second reset member 171; an adjustment member 173; a third reset member 175; and a second connecting member 172. The adjustment button 170 is disposed on the push handle 142 and is capable of sliding between an adjustment position and a fixed position. The second reset member 171 abuts against the adjustment button 170 and is configured to give the adjustment button 170 a tendency to slide to the fixed position. Optionally, the second reset member 171 is a spring, which is disposed inside the push handle 142, one end of the spring is connected in the push handle 142, and the other end of the spring is connected to one end of the adjustment button 170. The spring is configured to continuously apply pressure to the adjustment button 170, so that the adjustment button 170 has a tendency to slide to the fixed position. Optionally, the second reset member 171 can also be other forms of reset mechanisms, such as elastic pieces, torsion springs, etc., as long as it can give the adjustment button 170 a tendency to slide to the fixed position. The adjustment button 170 is drivingly connected to one end of the second connecting member 172, and the other end of the second connecting member 172 is connected to the driving member 174. When the adjustment button 170 is pressed towards the adjustment position, the adjustment button 170 pulls the second connecting member 172 in the direction towards the push handle 142 (pulls upwards), thereby pulling the driving member 174 via the second connecting member 172, so that the driving member 174 slides along the inner rod 140 towards the push handle 142. In one embodiment, the second connecting member 172 is a steel wire. When the adjustment button 170 is pressed towards the adjustment position, the adjustment button 170 tensions the steel wire, thereby the steel wire pulls the driving member 174, so that the driving member 174 slides along the inner rod 140 towards the push handle 142. Optionally, the second connecting member 172 can also be other forms of connecting members, such as connecting rods, connecting pieces, connecting blocks, etc., as long as it can drivingly connect the adjustment button 170 to the driving member 174.

[0153] In one embodiment, the adjusting member 173 is disposed within the inner rod 140. The adjusting member 173 allows the inner rod 140 and the outer rod 141 to slide relative to each other, or the adjusting member 173 locks the relative positions of the inner rod 140 and the outer rod 141. Specifically, the adjusting member 173 is fixed to the lower end of the inner rod 140. The adjusting member 173 is provided with a straight groove 1730, and a locking member 1731 is disposed within the straight groove 1730. The locking member 1731 is capable of sliding along the straight groove 1730. Optionally, the locking member 1731 is a locking pin. A plurality of locking holes 1410 are provided on the outer rod 141. When the locking member 1731 slides into the locking hole 1410, the inner rod 140 cannot slide within the outer rod 141. Thus, the adjusting member 173 locks the relative positions of the inner rod 140 and the outer rod 141, locking the length of the handlebar 14; when the locking member 1731 slides out of the locking hole 1410, the inner rod 140 is allowed to slide within the outer rod 141. Thus, the adjusting member 173 releases the locking of the relative positions of the inner rod 140 and the outer rod 141, allowing the length of the handlebar 14 to be adjusted. A driving member 174 is disposed within the inner rod 140. One end of the driving member 174 is connected to the second connecting member 172, and the other end of the driving member 174 is provided with a driving inclined groove (not shown). A pin 1732 (e.g., a rivet) disposed within the locking member 1731 passes through the driving inclined groove, connecting the driving member 174 and the locking member 1731. When the user presses the adjustment button 170 to the adjustment position, the second connecting member 172 (e.g., 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. The driving inclined groove of the driving member 174 forces the locking member 1731 to slide along the straight groove 1730 in a direction away from the locking hole 1410. Thus, the locking member 1731 slides out of the locking hole 1410, allowing the length of the handlebar 14 to be adjusted. When the handlebar 14 is adjusted to have an appropriate length, the user releases the pressing of the adjustment button 170. Under the action of the second reset member 171, the adjustment button 170 returns from the adjustment position to the fixed 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 a direction away from the push handle 142. Thus, the driving inclined groove of the driving member 174 causes the locking member 1731 to have a tendency to slide along the straight groove 1730 in a direction toward the locking hole 1410. At this time, if the corresponding end of the locking member 1731 is located at the position of the locking hole 1410, the locking member 1731 will slide into the locking hole 1410, locking the length of the handlebar 14; if the corresponding end of the locking member 1731 is not located at the position of the locking hole 1410, only slightly adjust the length of the handlebar so that the corresponding end of the locking member 1731 reaches the position of the nearest locking hole 1410. Thereafter, the locking member 1731 will automatically slide into the locking hole 1410, locking the length of the handlebar 14. It should be noted that the adjusting member 173 can be any structure known to those skilled in the art, and the present application does not limit this.

[0154] In one embodiment, one end of the third reset member 175 abuts against the adjusting member 173, and the other end of the third reset member 175 abuts against the driving member 174. The third reset member 175 is configured such that the driving member 174 has a tendency to slide in a direction away from the push handle 142. Optionally, the third reset member 175 is a spring, and one end of the spring (such as Figure 8 the end of the third reset member 175 close to the push handle 142) abuts against the adjusting member 173, and the other end of the spring (such as Figure 8 the end of the third reset member 175 away from the push handle 142) abuts against the driving member 174. The spring is configured to continuously apply pressure to the abutting driving member 174, such that the abutting driving member 174 has a tendency to slide in a direction away from the push handle 142. Optionally, the third reset member 175 can also be other forms of reset mechanisms, such as elastic sheets, torsion springs, etc., as long as it can make the driving member 174 have a tendency to slide in a direction away from the push handle 142.

[0155] Reference Figure 1 , in one embodiment, the frame 1 further includes: a support frame 13. The support frame 13 is of a generally rectangular structure. Optionally, the edge of the support frame 13, for example, the edge extending substantially along the length direction L, can be recessed towards the inside of the support frame 13 to avoid interference with other components of the frame 1, which will be described in detail later. The support frame 13 is pivotally connected to the locking joint 15. Preferably, the middle part of the support frame 13 is pivotally connected to the locking joint 15 to help reduce the size of the frame 1 in the length direction (L) in the folded state. Optionally, accessories such as a dinner plate assembly 130, a sunshade assembly 131, a seat fixing mechanism 132, etc. can be provided on the support frame 13. The dinner plate assembly 130 can be used to place tableware (not shown); the sunshade assembly 131 can be used to install a sunshade (not shown); the seat fixing mechanism 132 can be used to connect mechanisms such as a bassinet, a safety seat (not shown), etc. Further, in this embodiment, the 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 foot rod 12. When the frame 1 is in the unfolded 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 substantially at the same height in the height direction H, and jointly support the support frame 13, such that the support frame 13 is in a stable and non-pivoting state. When the frame 1 is switched from the unfolded state to the folded state, the linkage rod 18 pivots towards the rear of the frame 1, and the rear foot rod 12 pivots towards the front of the frame 1, whereby the angle γ between the linkage rod 18 and the rear foot rod 12 gradually increases, as Figures 3 to 5As shown. The pivot point of the linkage rod 18 on the support frame 13 gradually decreases in height in the height direction H. At the same time, along with the locking joint 15 gradually decreasing in height in the height direction H, the pivot point of the locking joint 15 on the support frame 13 also gradually decreases in height in the height direction H. During this process, the speed at which the pivot point of the locking joint 15 on the support frame 13 decreases in height in the height direction H is greater than the speed at which the pivot point of the linkage rod 18 on the support frame 13 decreases in height in the height direction H. Thus, the support frame 13 will present a tilted posture with the front lower and the rear higher, as Figures 3 to 5 shown. Finally, in the height direction H, the support frame 13, the rider 14, the front foot rod 11, the rear foot rod 12 and the chassis 10 are closely stacked together. Thus, the vehicle frame 1 switches to the folded state, as Figure 6 shown. In this embodiment, the pivot point of the rear foot rod 12 and the rider 14 is located on the side of the rider 14 facing the inside of the vehicle frame 1. The projection of the pivot track of the rear foot rod 12 along the height direction H does not overlap with the projection of the pivot track of the front foot rod 11 or the rider 14 along the height direction H. Thus, in the folded state, the rear foot rod 12 and the front foot rod 11 are staggered from each other in the width direction W.

[0156] Refer to Figure 1 and Figure 6 together. In one embodiment, the edge of the support frame 13 that generally extends along the length direction L is recessed towards the inside of the support frame 13. The distance between the two edges of the chassis 10 that generally extend 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. That is, the distance between the two edges of the support frame 13 that generally extend along the length direction L is not greater than the distance between the two edges of the chassis 10 that generally extend along the length direction L. The projection of the rear foot rod 12 in the length direction L is generally in an "S" shape. Specifically, the generally upper section of the rear foot rod 12 has an outward convex portion 122 that protrudes towards the outside of the vehicle frame 1. The outward convex portion 122 is used to avoid the support frame 13 to allow the upper end of the rear foot rod 12 to be pivotally connected to the rider 14; the generally lower section of the rear foot rod 12 has an inward concave portion 123 that is recessed towards the inside of the vehicle frame 1. The inward concave portion 123 is used to provide a pivot connection point for the linkage rod 18. When the vehicle frame 1 switches between the deployed state and the folded state, the recess on the edge of the support frame 13 that generally extends along the length direction L and the outward convex portion 122 of the rear foot rod 12 provide a pivot space for the pivot of the rear foot rod 12, avoiding interference between the support frame 13 and the rear foot rod 12.

[0157] In Figures 1 to 6In the illustrated embodiment, the frame 1 further includes: a front footrest 110 and a rear footrest 120. The front footrest 110 is connected to the chassis 10, and the front foot bar 11 is pivotally connected to the front footrest 110. The rear footrest 120 is connected to the chassis 10, and the rear foot bar 12 is pivotally connected to the rear footrest 120. In one embodiment, the frame 1 is further provided with a pull rod 19, and the user can pull the cart through the pull rod 19. Optionally, the pull rod 19 is arranged at the front part of the chassis 10. Preferably, the pull rod 19 is pivotally arranged at the middle part of the second rod 103. Refer to Figure 1 and Figure 3 , in one embodiment, the pull rod 19 can slide along the slide rail 196 arranged at the bottom of the chassis 10 to a storage position located at the bottom of the chassis 10. As Figure 2 shown, the chassis 10 is arranged to be inclined from front to back and from top to bottom, and the slide rail 196 is also arranged to be inclined so as to be able to guide the pull rod 19 to slide to the storage position and facilitate the user to pull out the pull rod 19.

[0158] Figure 9 FIG. 10 shows a perspective view of the frame 1 in the deployed state according to an embodiment of the present application. Figures 10 to 13 Shows Figure 9 the process of the frame 1 shown in Figure 9 switching from the deployed state to the folded state. Figure 1 The frame 1 in the illustrated embodiment is substantially the same in structure as the frame 1 in the embodiment shown in

[0159] Refer to Figure 9 , in this embodiment, a first bending portion 1001 protruding inwardly towards the interior of the frame 1 is formed on the first rod 100 to form a first avoidance space 10010. When the frame 1 is in the folded state, at least a part of the front foot bar 11 is located in the first avoidance space 10010. Optionally, the position of the first bending portion 1001 on the first rod 100 is set such that when the frame 1 is in the folded state, at least half of the axial extension length of the front foot bar 11 can be located in the first avoidance space 10010 (as Figure 13 shown), so that the structure of the folded frame 1 is more compact, and further reduces the dimensions of the folded frame 1 in the length direction L and the height direction H.

[0160] Refer to Figure 9 and Figure 13, in this embodiment, a second bending portion 121 protruding towards the rear of the frame 1 is formed on the rear foot rod 12 to form a second avoidance space 1210. When the frame 1 is in the folded state, at least a part of the rider 14 is located within the second avoidance space 1210. Optionally, the second bending portion 121 is arranged such that during the process of the frame 1 switching to the folded state, the locking joint 15 can be accommodated within the second avoidance space 1210, whereby the rear foot rod 12 does not restrict the pivoting of the rider 14 relative to the front foot rod 11; when the frame 1 is fully in the folded state, at least half of the axially extending length of the rider 14 can be located within the second avoidance space 1210 (as Figure 13 shown), a part of the rear foot rod 12 abuts above the rider 14, thereby making the structure of the folded frame 1 more compact and further reducing the dimensions of the folded frame 1 in the length direction L and the height direction H.

[0161] Referring also to Figure 9 and Figure 13 , in this embodiment, one end of the linkage rod 18 is pivotally connected to the support frame 13, and the other end of the linkage rod 18 protrudes towards the outside of the frame 1 in the width direction W to be pivotally connected to the front foot rod 11. The pivot point of the rear foot rod 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 rod 12 along the height direction H at least partially overlaps with the projection of the pivot trajectory of the front foot rod 11 and / or the rider 14 along the height direction H.

[0162] Referring also to Figures 10 to 13 , when the frame 1 switches from the unfolded state to the folded state, the rider 14 and the rear foot rod 12 pivot towards the front of the frame 1, and the front foot rod 11 pivots towards the rear of the frame 1. The first rod 100, the front foot rod 11, the rear foot rod 12, and the rider 14 no longer maintain a substantially triangular structure. During the folding process, the rider 14, the front foot rod 11, and the rear foot rod 12 gradually approach the chassis 10 until, in the height direction H, the rider 14, the front foot rod 11, the rear foot rod 12, and the chassis 10 are tightly stacked together. At this time, at least a part of the front foot rod 11 is located within the first avoidance space 10010, and at least a part of the rider 14 is located within the second avoidance space 1210. Thus, the frame 1 switches to the folded state, as Figure 13As shown. Compared with the unfolded state, the dimensions of the frame 1 in the height direction H and the length direction L are significantly reduced in the folded state, so that it can be easily stored and stowed, for example, in the trunk of a car. Further, the significant reduction in the dimensions of the frame 1 enables the user to lift and carry the stroller more easily. Further, in this embodiment, there is a certain offset distance between the pivot position of the support frame 13 and the locking joint 15, or more precisely, the pivot position of the support frame 13 and the rider 14 and the middle part of the support frame 13. Specifically, the pivot position of the support frame 13 and the rider 14 is offset toward the side of the support frame 13 away from the linkage rod 18. The linkage rod 18 is disposed between the support frame 13 and the front foot rod 11. When the frame 1 is in the unfolded 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 substantially at the same height in the height direction H, and jointly support the support frame 13, so that the support frame 13 is in a stable and non-pivoting state. When the frame 1 is switched from the unfolded state to the folded state, the linkage rod 18 pivots forward of the frame 1, and the pivot point of the linkage rod 18 on the support frame 13 gradually decreases in height in the height direction H. At the same time, as the rider 14 pivots forward 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 height in the height direction H. In this process, the speed at which the pivot point of the linkage rod 18 on the support frame 13 decreases in height in the height direction H is substantially the same as the speed at which 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) decreases in height in the height direction H. Thus, during the folding process, the support frame 13 hardly pivots relative to the plane parallel to the length direction L and the width direction W, and the support frame 13 remains substantially horizontal, as Figures 10 to 12 shown. Finally, in the height direction H, the support frame 13, the rider 14, the front foot rod 11, the rear foot rod 12 and the chassis 10 are closely stacked together. The design of this embodiment at least brings the following beneficial effects:

[0163] 1. It avoids accidentally pinching or hitting a part of the user's body, such as the hand, knee, etc. due to the pivoting of the support frame 13;

[0164] 2. When the support frame 13 is sleeved with a cloth cover, the support frame 13 and the cloth cover are lowered and folded together in a substantially horizontal posture. Compared with the embodiment Figure 1 shown, the materials at different positions of the cloth cover can be more evenly compressed and folded, and thus, it will be more flat after folding.

[0165] Continue to refer to Figure 9, in this embodiment, a second reinforcing rod 102 is disposed between the two first rods 100, and the second reinforcing rod 102 is used to enhance the overall structural stability of the chassis 10. In particular, the second reinforcing rod 102 is used to increase the structural stability at the first bending portion 1001. Optionally, both ends of the second reinforcing rod 102 are respectively connected to the first bending portions 1001 of the two first rods 100. Optionally, the second reinforcing rod 102 is arranged in an arc structure.

[0166] Refer also to Figure 9 and Figure 14 , in this embodiment, the adjustment button 170 is a push button sleeved on the inner rod 140, and the adjustment button 170 can slide along the axial direction of the inner rod 140 between an adjustment position and a fixed position. When the user pushes and pulls the adjustment button 170 to make the adjustment button 170 slide from the fixed position to the adjustment position, the adjustment button 170 drives the adjustment member 173 to slide to the adjustment state through the second connecting member 172, so as to allow the inner rod 140 and the outer rod 141 to slide relative to each other, thereby allowing the adjustment of the length and height of the scooter 14.

[0167] According to an embodiment of the present application, a trolley is further provided. The trolley includes a frame 1 according to the embodiment of the present application and a cloth cover (not shown) sleeved on the support frame 13. The support frame 13 and the cloth cover together form a storage space of the trolley.

[0168] The following takes the Figure 1 illustrated embodiment as an example to illustrate the folding process of the frame 1 according to the embodiment of the present application. As Figure 1 and Figure 2 shown, the frame 1 is in an unfolded state. When folding, first, remove the mechanisms such as a bassinet and a safety seat connected to the seat fixing mechanism 132, and adjust the seat fixing mechanism 132 to the Figure 1 shown storage posture; pivot and slide the pull rod 19 to the storage position; and adjust the sunshade assembly 131 to the storage posture, as Figure 3 shown. Then, the user pushes and pulls the unlocking operating member 160, which is, for example, an unlocking push button, and pivots the scooter 14 forward toward the front of the frame 1, so that the scooter 14 drives the rear foot rod 12 to pivot forward toward the front of the frame 1, and drives the front foot rod 11 to pivot backward toward the rear of the frame 1. When the scooter 14 passes the vertical position (i.e., the position where the axial extension of the scooter 14 is parallel to the height direction H), the user does not need to continue to push the scooter 14, and the scooter 14, the front foot rod 11, and the rear foot rod 12 will gradually approach the chassis 10 under the action of gravity until, in the height direction H, the scooter 14, the front foot rod 11, the rear foot rod 12 and the chassis 10 are tightly stacked together, and the frame 1 switches to the folded state, as Figure 5 and Figure 6As shown. Finally, the user hooks the folding hook 1002 onto the connecting protrusion 143 to keep the frame 1 in the folded state and prevent accidental unfolding.

[0169] Reference Figures 15 to 17 , an embodiment of the present application provides a trolley, which includes: a chassis 10 and a pull rod mechanism 2, and the pull rod mechanism 2 is connected to the chassis 10. The pull rod mechanism 2 includes: a pull rod 19; a rotating part 192; and a third connecting seat 194. One end of the pull rod 19 is connected to the rotating part 192, and 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. With the chassis 10 or the rotating part 192 as a reference, 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 chassis 10 (or the third connecting seat 194). Specifically, when the rotating part 192 pivots to the first pivot position, the pull rod 19 pivots to the upright position, as Figure 15 shown; when the rotating part 192 pivots to the second pivot position, the pull rod 19 pivots to the lying-down position, as Figure 17 shown. When the user pulls the trolley through the pull rod 19, the pull rod 19 and the rotating part 192 will pivot to a use position that is relatively matched with the user's height and arm length. For example, the position where the pull rod 19 is in Figure 16 is convenient for the user to operate.

[0170] As Figure 18 shown, in one embodiment, the pull rod 19 includes a handle 190 and a connecting rod 191. The handle 190 is set to a generally annular structure to facilitate the user's holding. It should be noted that the generally annular structure is only an optional implementation manner of the handle structure. Those skilled in the art can select other structural forms of the handle according to the use requirements, such as polygonal, linear, "T"-shaped, cross-shaped, etc., as long as it can meet the user's need to hold the handle. The present application does not limit this. In Figure 18In the illustrated embodiment, the handle 19 includes a mounting portion 1902 and a grip 1901 for the user to hold. One end of the mounting portion 1902 is connected to one end of the connecting rod 191, and the other end of the mounting portion 1902 is connected to the grip 1901. Optionally, the grip 1901 is arranged to be generally "C"-shaped, and the mounting portion 1902 is arranged to be generally "T"-shaped, wherein the two end portions of the "C"-shaped grip 1901 are respectively connected to the two end portions of the "T"-shaped mounting portion 1902, and the other end portion of the "T"-shaped mounting portion 1902 is connected to one end of the connecting rod 191. Optionally, the mounting portion 1902 and the grip 1901 are integrally formed. Optionally, the grip 1901 is made of a non-slip material such as a rubber material or a plastic material. Preferably, the surface of the grip 1901 is provided with a non-slip structure, for example, non-slip grooves, non-slip protrusions, etc. The other end of the connecting rod 191 is connected to the rotating portion 192. Optionally, the mounting portion 1902, the grip 1901 and the connecting rod 191 are integrally formed.

[0171] Referring Figure 19 , Figure 20 and Figure 23 , in one embodiment, the rotating portion 192 includes: a main body 1921 and a connecting end 1922. The main body 1921 is arranged to be generally cylindrical in structure and can pivot about the axis of the cylinder. It should be noted that the generally cylindrical structure is only an optional embodiment of the present application, and those skilled in the art can select other suitable shapes for the main body of the rotating portion according to actual needs, such as a cube, a polyhedron, etc., and the present application does not limit this. The connecting end 1922 is arranged as a boss protruding from the cylindrical surface of the main body 1921, and the boss is provided with a first connection hole 19220, and the other end of the connecting rod 191 is inserted into the first connection hole 19220. A receiving cavity 19221 communicating with the first connection hole 19220 is provided inside the main body 1921, and a second pivot hole 1924 is provided on each of the two end faces of the main body 1921, and the second pivot hole 1924 communicates with the receiving cavity 19221. The other end of the connecting rod 191 passes through the first connection hole 19220 and is received in the receiving cavity 19221, and a first pivot hole 1910 penetrating the connecting rod 191 is provided at the other end of the connecting rod 191.

[0172] Referring Figures 19 to 21 and Figure 23, in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivoting space 1944. The shape of the pivoting space 1944 is set to be a generally cylindrical shape that matches the shape of the main body 1921 of the rotating part 192. The main body 1921 of the rotating part 192 is pivotally arranged in the pivoting space 1944. It should be noted that the generally cylindrical structure is only an optional embodiment of the present application. Those skilled in the art can select other suitable shapes for the pivoting space of the connecting seat according to actual needs, such as a cube, a polyhedron, etc., as long as it can allow the main body 1921 of the rotating part 192 to be pivotable in the pivoting space 1944. The present application does not limit this. The side wall of the pivoting space 1944 is provided with a fourth pivoting hole 1943 communicating with the pivoting space 1944.

[0173] Reference Figure 19 and Figure 20, in one embodiment, a first positioning member 193 is provided 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 can be understood that the first positioning member 193 plays a limiting role on the pull rod 19, such that the pull rod 19 has 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 face of the main body 1921 of the rotating portion 192. Optionally, the first positioning member 193 is a damping piece 1931, and the thickness of the damping piece 1931 is slightly greater than the gap between the inner surface of the side wall of the pivot space 1944 (i.e., the inner wall of the pivot 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 pivot space 1944). Thus, the damping piece 1931 is clamped between the inner surface of the side wall of the pivot space 1944 and the end face of the main body 1921. When the rotating portion 19 has a tendency to pivot relative to the third connecting seat 194, there are static frictional forces between the damping piece 1931 and the side wall of the pivot space 1944 and between the damping piece 1931 and the end face of the main body 1921, and the resultant of these static frictional forces prevents the rotating portion 192 from pivoting relative to the third connecting seat 194. In this embodiment, the clamping force (pressure) of the inner surface of the side wall of the pivot space 1944 and the end face of the main body 1921 on the damping piece 1931 is set such that the moment caused by the resultant of the static frictional forces exerted by the damping piece 1931 on the side wall of the pivot space 1944 and the end face of the main body 1921 due to this clamping force (pressure) is not less than the moment caused by the gravity of the pull rod 19 and the rotating portion 192. Thus, when the user does not apply any external force to the pull rod mechanism 2, the pull rod 19 and the rotating portion 192 can remain in their original positions without pivoting. Through such a design, it is achieved that the pull rod 19 can be held at any use position (for example, the pull rod 19 is at Figure 16Position in). Thus, when the user releases the grip on the pull rod 19, the pull rod 19 will not suddenly pivot or fall towards the support surface under its own gravity, improving the safety of using the trolley and facilitating the user to grip the pull rod 19 again. Further, when the user applies a pulling force or a pushing force to the pull rod 19, if the total moment that causes the pull rod 19 and the rotating part 192 to have a pivoting tendency is greater than the moment caused by the resultant force of the static friction forces acting on the side wall of the pivoting space 1944 and the end face of the main body 1921 by the damping piece 1931 through this clamping force (pressure), the pull rod 19 and the rotating part 192 will pivot. Through such a design, the adjustment and positioning of the use position of the pull rod 19 are realized, and the user can adjust the pull rod 19 to any position between the first pivoting position and the second pivoting position, realizing stepless adjustment of the use angle of the pull rod 19, with wider applicability.

[0174] In one embodiment, optionally, the damping piece 1931 is a flexible component. Optionally, the material of the damping piece 1931 includes at least one of the following: soft colloid; rubber material; and plastic material. Optionally, the material of the damping piece 1931 may include HYTREL material.

[0175] Reference Figure 20 and Figure 23 and, in one embodiment, a damping piece 1931 is provided between each of the two end faces of the main body 1921 and the side wall of the pivoting space 1944. A third pivoting hole 19310 is provided on the damping piece 1931. When the connecting rod 191, the rotating part 192, the damping piece 1931 and the third connecting seat 194 are assembled together, the pivoting pin 195 is sequentially passed through the fourth pivoting hole 1943, the third pivoting hole 19310, the second pivoting hole 1924 and the first pivoting hole 1910. Thus, the connecting rod 191 and the rotating part 192 are pivotally connected and the damping piece 1931 is positioned (preventing the damping piece 1931 from sliding out of the gap between the inner surface of the side wall of the pivoting space 1944 and the end face 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.

[0176] Reference Figure 23, in one embodiment, a limiting projection 1923 is provided on the outer surface of the main body 1921 of the rotating part 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 part 192 pivots, the limiting projection 1923 slides in the limiting groove 19440. When the rotating part 192 pivots from the first pivoting position to the second pivoting position, that is, when the pull rod 19 pivots from the erected position to the lying-down position, the limiting projection 1923 abuts against the side wall of the limiting groove 19440 to limit the further pivoting of the rotating part 192. By providing the limiting projection 1923 and the limiting groove 19440, the rotation range of the pull rod 19 can be limited, so that there is still a certain distance between the pull rod 19 and the supporting surface of the trolley (such as the ground) when the pull rod 19 is in the lying-down position. On the one hand, it avoids the pull rod 19 contacting the supporting surface of the trolley (such as the ground) due to "excessive lying down", resulting in soiling or wear of the handle 190. On the other hand, it is also convenient for the user to grasp the pull rod 19 in the lying-down position, which is convenient and practical. It should be noted that although in this embodiment, the limiting projection 1923 is provided on the main body 1921 of the rotating part 192 and the limiting groove 19440 is provided on the inner wall of the pivoting space 1944 of the third connecting seat 194, this is only an optional embodiment. Those skilled in the art can adjust the setting positions of the limiting projection and the limiting groove according to actual needs, as long as the pivoting of the rotating part can be limited to avoid "excessive lying down". For example, the limiting projection can be provided on the inner wall of the pivoting space of the third connecting seat, and the limiting groove can be provided in the main body of the rotating part.

[0177] Reference Figure 21 and Figure 22 , in one embodiment, a first through hole 1941 is provided at one end of the third connecting seat 194 opposite to the pivoting space 1944, and the first through hole 1941 is slidably sleeved on the slide rail 196. The third connecting seat 194 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, as Figure 21 shown; when the third connecting seat 194 slides to the second sliding position, the pull rod 19 slides to the storage position, as Figure 22 shown. Thus, when the user does not need to use the pull rod 19 or needs to fold up the trolley, the pull rod 19 can be slid to the storage position, avoiding the pull rod 19 from affecting the user's operation and facilitating the folding up of the trolley.

[0178] Reference Figure 21 and Figure 23, in one embodiment, a second through hole 1942 is provided on the side wall of the first through hole 1941. A second positioning hole 1961 is provided in a portion of the slide rail 196 corresponding to the first sliding position of the third connecting seat 194. A second positioning member 1960 is provided in the slide rail 196. At least a portion of the second positioning member 1960 is slidable within 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, thereby preventing the third connecting seat 194 from undesirably sliding towards the second sliding position and maintaining the pull rod 19 in the extended position. Optionally, the second positioning member 1960 is a spring piece, and the spring piece has a first convex post 19601 which is slidable within the second positioning hole 1961.

[0179] Reference Figure 22 and Figure 24 , in one embodiment, a third positioning hole 1963 is provided in a portion of the slide rail 196 corresponding to the second sliding position of the third connecting seat 194. A third positioning member 1962 is provided in 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 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, thereby preventing the third connecting seat 194 from undesirably sliding towards the first sliding position and facilitating maintaining the pull rod 19 in the retracted position. For example, when the pull rod 19 is in the retracted position, even if the cart is supported on an inclined surface or an external force suddenly impacts the rear of the cart, the third connecting seat 194 can be 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 piece, and the spring piece has a second convex post 19621 which is slidable within the third positioning hole 1963.

[0180] Reference Figure 20 、 Figure 21 and Figure 22 , in one embodiment, the pull rod mechanism 2 further includes a fixing portion 198, and the slide rail 196 is connected to the fixing portion 198. When the rotating portion 192 pivots from the second pivoting position to the first pivoting position, the pull rod 19 abuts against the front surface of the fixing portion 198 to limit the further pivoting of the rotating portion 192. In this embodiment, the pull rod mechanism 2 includes a front rod 1031 and a rear rod 1032, and the front rod 1031 and the rear rod 1032 are connected to the chassis 10. Optionally, as Figure 20As shown, the chassis 10 includes two first rods 100 extending along the length direction L of the trolley and two second rods 103 extending along the width direction W of the trolley. The front rod 1031 and the rear rod 1032 are respectively two second rods 103 of the chassis 10. A fixing portion 198 is respectively fixed on the front rod 1031 and the rear rod 1032, and both ends of the slide rail 196 are respectively connected to the two fixing 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 fixing portion 198 fixed on the front rod 1031 to limit the continuous pivoting of the rotating portion 192. For the convenience of description, terms representing relative positions, such as "upper", "lower", "front", and "rear", are used in this application. These terms representing relative positions are based on Figure 15 the directions shown in Figure 15 . Specifically, in

[0181] , the relative upper side is "upper", the relative lower side is "lower", the relative left side is "front", and the relative right side is "rear".

[0181] Referring to Figure 19 and Figure 22 , in one embodiment, the pull rod mechanism 2 further includes at least one receiving member 197. The receiving member 197 is disposed on the front rod 1031, and a receiving groove 1970 is provided in the receiving member 197. When the pull rod 19 slides to the receiving position, at least a part of the pull rod 19 is received in the receiving groove 1970. In this embodiment, the receiving member 197 is hook-shaped, but this is only exemplary. In other embodiments, the receiving member 197 can also be set to other suitable shapes, and this application does not limit this. Optionally, when the pull rod 19 slides to the receiving position, the handle 190 of the pull rod 19 is received in the receiving groove 1970. Optionally, the pull rod mechanism 2 includes two receiving members 197. The two receiving members 197 are spaced apart by a fixing portion 198 disposed on the front rod 1031, and the openings of the receiving grooves 1970 of the two receiving members 197 are oppositely disposed. When the pull rod 19 slides to the receiving position, at least a part of the pull rod 19, such as the handle 190, is received in the two receiving grooves 1970.

[0182] Referring again to Figure 17 , in one embodiment, there is a certain angle α between the extending direction D2 of the slide rail 196 and the plane D1 where the supporting surface is located, and when the pull rod 19 is in the lying state, the extending direction of the pull rod 19 is substantially parallel to the extending direction D2 of the slide rail 196. Through such a design, on the one hand, when the pull rod 19 is in the lying state, there is a certain distance between the handle 190 and the supporting surface, which is convenient for the user to grip the handle 190 again; on the other hand, the angle α makes the pulling and pushing actions of the pull rod 19 more in line with the ergonomic standards, making the operation of the user pulling and pushing the pull rod 19 more comfortable.

[0183] Next, taking Figures 15 to 24The illustrated embodiment is taken as an example to illustrate the working principle of the pull rod mechanism 2 according to the embodiment of the present application.

[0184] like Figure 22 As shown, the pull rod 19 is in the storage position, stored under the bottom frame 10 of the cart. At this time, the second boss 19621 passes through the third positioning hole 1963 and enters the second through hole 1942. Figure 24 , the third connecting seat 194 is kept in the second sliding position, that is, the pull rod 19 is kept in the storage position. In the absence of external force pulling out the pull rod 19, the pull rod 19 will not move out of the storage position. In this state, the pull rod 19 has a very small impact on the overall volume of the stroller and does not affect the folding operation of the stroller.

[0185] When the user needs to use the pull rod 19 to pull the cart, the user holds the handle 190 of the pull rod 19 and applies a pulling force to the pull rod 19 toward the front of the cart. When the pulling force is sufficient to overcome the elastic force of the spring, the second protrusion 19621 exits the second through hole 1942, thereby releasing the hold on the third connecting seat 194. Continue to apply the pulling force to pull the pull rod 19 from the storage position to the extended position. Figure 17 Since the slide rail 196 forms an included angle α with the supporting surface, the above-mentioned pulling-out operation conforms to the ergonomic standard, and thus, the above-mentioned pulling-out operation is relatively comfortable for the user.

[0186] 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. Figure 23 , keep the third connecting seat 194 in the first sliding position, that is, keep 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 tension to the pull rod 19 to pull the cart. During this process, based on the height and arm length of the user, the rotating portion 192 and the pull rod 19 will pivot to a position suitable for the user (for example, the pull rod 19 is in the Figure 16 position in the middle).

[0187] 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.

[0188] If it is necessary to pivot the pull rod 19 to the upright position (such as Figure 15To rotate the pull rod 19 to its upright position, simply apply a push force to the pull rod 19. At this point, the pull rod 19 abuts against the front surface of the fixing portion 198 of the front rod 1031 and cannot pivot further. This prevents the pull rod 19 from interfering with other stroller components during pivoting, prevents it from squeezing items stored in the stroller, and prevents it from accidentally injuring a child in a baby carrier.

[0189] 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 force is sufficient to overcome the elastic force of the spring, the first protrusion 19601 exits the second through hole 1942, thereby releasing the hold on the third connecting seat 194. Continue to apply the force to push the pull rod 19 from the extended position to the storage position. Figure 22 At this time, the second boss 19621 passes through the third positioning hole 1963 and enters the second through hole 1942 (refer to Figure 24 ), the third connecting seat 194 is kept in the second sliding position, that is, the pull rod 19 is kept 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 groove 1970.

[0190] Figures 25 to 29 Other embodiments according to the present application are shown, 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.

[0191] refer to Figure 25 and Figure 26 In one embodiment, the pull rod mechanism 2 includes a storage member 197, which is arranged on the lower side of a fixing portion 198 fixed to the front rod 1031, and the opening of a storage slot 1970 of the storage member 197 faces the front of the fixing portion 198. Optionally, the storage 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 storage slot 1970. In this embodiment, the opening of the storage slot 1970 faces the front, making it easier for the user to take the handle 190 out and put it into the storage slot 1970. In this embodiment, a portion of the handle 190 is accommodated in the storage 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.

[0192] refer to Figure 28 and Figure 29, in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivot space 1944, and at least a part of the rotating portion 192 is received in the pivot space. 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 face 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 face each other. A positioning protrusion 1945 is provided on the side of the elastic finger 199 facing the positioning recess 1932, and the positioning protrusion 1945 can be engaged with one of the positioning recesses 1932 to position the pull rod 19 at one of a plurality of pivot angles.

[0193] Continue to refer to Figure 28 and Figure 29 , in one embodiment, the first positioning member 193 includes a positioning recess 1932 and a positioning protrusion 1945 that are in shape fit with each other. To clearly show the structures of the positioning recess 1932 and the positioning protrusion 1945, Figure 29 part of the inner wall structure of the pivot space 1944 is removed in ​ the illustrated embodiment. In the embodiment shown, at least one positioning recess 1932 is provided in the end face of the main body 1921 of the rotating portion 192, and at least one positioning protrusion 1945 is provided on the inner wall of the pivot space 1944 (the inner surface of the side wall of the pivot space). As the rotating portion 192 pivots, when the positioning protrusion 1945 enters the positioning recess 1932, through the shape fit between the two, the positioning protrusion 1945 is restricted in the positioning recess 1932, thereby restricting the further pivoting of the rotating portion 192 and holding the pull rod 19 in the corresponding use position. Optionally, the positioning recess 1932 and the positioning protrusion 1945 can also be provided in opposite positions, that is, at least one positioning recess 1932 is provided on the inner wall of the pivot space 1944, and at least one positioning protrusion 1945 is provided in the end face of the main body 1921 of the rotating portion 192. Optionally, more than one positioning recess 1932 is provided to hold the pull rod 19 in more than one working position. Preferably, two sets of positioning recesses 1932 are provided, each set of positioning recesses 1932 includes more than one positioning recess 1932, and two positioning protrusions 1945 are provided, and the two positioning protrusions 1945 cooperate with one set of positioning recesses 1932 respectively. More preferably, each set of positioning recesses 1932 includes four positioning recesses 1932 to hold the pull rod 19 in four different working positions, as ​As shown. In other embodiments, the number of positioning protrusions 1945 on each inner wall of the pivot space 1944 is not limited to two either. For example, the number of positioning protrusions 1945 on each inner wall of the pivot space 1944 can be one, three, four, etc. In addition, the number of positioning recesses 1932 included in each group of positioning recesses 1932 is not limited to four either. It can be any number more than two and can be set according to the required adjustment positions, such as three, five, etc.

[0194] For ​ the embodiment shown, its working principle is basically the same as that of the foregoing embodiments. The difference is that during the process of pulling the cart, if the user aborts the pulling and releases the grip on the pull rod 19, if the positioning protrusion 1945 of the first positioning member 193 is located in the positioning recess 1932 at this time, the pull rod 19 will remain at the position where the pull rod 19 is located at the moment when the user releases the pull rod 19; if the positioning protrusion 1945 of the first positioning member 193 is not engaged in the positioning recess 1932 at this time, the pull rod 19 will pivot slightly towards the support surface by its own gravity until the positioning protrusion 1945 enters and engages in the positioning recess 1932, and the pull rod 19 will remain at the position where the pull rod 19 is located at the moment when the positioning protrusion 1945 enters and engages in the positioning recess 1932. In such an embodiment, the pull rod 19 can still be kept at the use position or a position near the use position, avoiding the risk that the pull rod 19 pivots to the support surface due to its own gravity and injures the user.

[0195] Referring to ​ , an embodiment of the present application provides a seat fixing mechanism 132, including: a fixed seat 133 and a clamping seat 134. The clamping seat 134 is slidably connected to the fixed seat 133, and the clamping seat 134 can move between a retracted position and an extended position, such as sliding. When the clamping seat 134 is in the extended position, it is farther away from the fixed seat 133 than when it is in the retracted position. In this embodiment, the clamping seat 134 is also arranged to be pivotable relative to the fixed seat 133. When the clamping seat 134 moves between the extended position and the retracted position, the clamping seat 134 undergoes an angular deflection relative to the fixed seat 133. Of course, the clamping seat 134 being pivotable relative to the fixed seat 133 is only an optional implementation manner of the present application. In other embodiments, the clamping seat 134 can also be arranged to be non-pivotable relative to the fixed seat 133, and the clamping seat 134 only performs translational motion between the extended position and the retracted position.

[0196] Specifically, in this embodiment, the cart includes a support frame 13, and a seat fixing mechanism 132 is respectively connected to two side rods (i.e., rods extending substantially along the length direction L) of the support frame 13, as ​As shown. For the convenience of description, in the following description, only one seat fixing mechanism 132 will be 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 between the folded position and the unfolded position simultaneously. It should be noted that in actual use, the engaging seats 134 of the seat fixing mechanisms 132 provided on the two side rods pivot between the folded position and the unfolded position simultaneously, which is intended to facilitate the folding operation of the stroller and for connecting the seat 135, refer to ​ and ​ , which is required by the actual use scenario, but this does not mean that the two engaging seats 134 cannot pivot independently.

[0197] Continue to refer to ​ In one embodiment, the engaging seat 134 includes: an engaging portion 1346 and a base portion 1349. The engaging portion 1346 is configured to be inserted into an engaging groove (not shown) of the seat 135. The base portion 1349 is connected to the engaging portion 1346 and is pivotally connected to the fixing seat 133. Optionally, the engaging portion 1346 and the base portion 1349 are integrally formed. Optionally, refer to ​ , there is an arc-shaped transition region between the engaging portion 1346 and the base portion 1349, and the width of the engaging portion 1346 is smaller than the width of the base portion 1349 to fit the shape of the side wall of the seat 135. It should be noted that the width direction of the engaging portion 1346 also takes the width direction W of the stroller in ​ (the left-right direction of the paper surface) as the width direction of the engaging portion 1346. ​

[0198] Refer to ​ In one embodiment, when the engaging seat 134 is in the folded position, the distance between the engaging portions 1346 of the two engaging seats 134 is L1, and the distance between the base portions 1349 of the two engaging seats 134 is L2, refer to ​ . Optionally, the range of L1 can be 323.46 mm ≤ L1 ≤ 395.34 mm, for example, L1 is approximately 359.4 mm; the range of L2 can be 293.4 mm ≤ L2 ≤ 358.6 mm, for example, L2 is approximately 326 mm. Those skilled in the art can understand that the distance between the two side rods of the support frame 13 can be changed according to actual needs to change the sizes of L1 and L2. When the engaging seat 134 is in the unfolded position, the distance between the engaging portions 1346 of the two engaging seats 134 is L1', and the distance between the base portions 1349 of the two engaging seats 134 is L2', refer to ​ ​Optionally, the range of L1' can be 301.86 mm ≤ L1' ≤ 368.94 mm. For example, L1' is approximately 335.4 mm; L2' is approximately 302 mm. Those skilled in the art can understand that in actual use, the size of L1' can be selected according to the spacing between the two engagement grooves of the seat 135 to be fixed. When pivoting from the deployed position to the retracted 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 24 mm. For comparison reference ​ and ​ . There is a larger spacing between the two engaging seats 134 in the retracted position. Thus, the seat fixing mechanism 132 occupies less space between the two side rods of the support frame 13. On the one hand, this is beneficial for reducing the interference of the engaging seats 134 on other components of the stroller when the stroller is retracted. On the other hand, during the use of the stroller, the seat 135 may not be needed. The increased spacing between the two engaging seats 134 in the retracted position is beneficial for reducing the interference of the engaging seats 134 on the user's operation. For example, it reduces the interference and obstruction of the engaging seats 134 to the activities of children sitting in the carriage formed by the support frame 13 and the fabric cover, or reduces the interference and obstruction of the engaging seats 134 to the user when placing or taking items.

[0199] ​ and ​ show a stroller with a seat 135 fixed. Optionally, the seat 135 can be a carrycot suitable for a younger baby, or a seat that can be assembled to a baby stroller. Optionally, the seat 135 can be replaced with other accessories such as a storage basket. When installing the seat 135, the accessories already installed on the stroller that may interfere with the seat 135, such as the plate assembly 130, etc., should be removed first.

[0200] Reference ​ , in one embodiment, a first card hole 1347 is provided at the upper end of the joint portion 1346 and / or a second card hole 1348 is provided at the lower end of the base portion 1349. The first card 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 stroller and prevent it from shaking. Of course, in other embodiments, the first card hole 1347 may not be provided at the upper end of the joint portion 1346, and the rod may not be provided in the engagement groove of the seat 135. The second card hole 1348 is used to cooperate with the engaging protrusion of the seat 135 to make the fixation of the seat 135 more stable.

[0201] Continue to refer to ​, in one embodiment, the fixed 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 fixed seat 133 and the engaging seat 134. Two opposite first convex portions 13331 and two opposite first concave portions 13332 are formed at one end of the connecting end portion 1333 facing the engaging seat 134. The two first convex portions 13331 are spaced apart by the two first concave portions 13332, and a first inclined surface 13333 is provided between the adjacent first convex portion 13331 and the first concave portion 13332. Two opposite second convex portions 13421 and two opposite second concave portions 13422 are formed on the bottom wall of the third connecting groove 1342. The two second convex portions 13421 are spaced apart by the two second concave portions 13422, and a second inclined surface 13423 is provided between the adjacent second convex portion 13421 and the second concave portion 13422. When the engaging seat 134 is in the retracted position, the two second convex portions 13421 are respectively fitted in the two first concave portions 13331, and the two first convex portions 13331 are respectively fitted in the two second concave portions 13422. When the engaging seat 134 pivots from the retracted position to the deployed position, the first convex portion 13331 disengages from the second concave portion 13422. Through the abutting and cooperating of the second inclined surface 13423 and the first inclined surface 13333, the first convex portion 13331 slides to a position where it abuts against the second convex portion 13421, and the engaging seat 134 slides in a direction away from the fixed seat 133.

[0202] Reference ​ , in one embodiment, the fixed seat 133 is provided with a mounting groove 1334. The mounting groove 1334 accommodates the side rod of the support frame 13. Through fixing members such as rivets, screws or bolts and nuts, etc., the mounting groove 1334 is fixed to the corresponding side rod, thereby realizing the connection between the fixed seat 133 and the side rod. In one embodiment, the engaging seat 134 is provided with a mounting through hole 1340. An end cap 1335 and a first elastic member 1331 are provided in the mounting through hole 1340. The end cap 1335 is connected to the fixed seat 133. 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 cap 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 towards the fixed seat 133. Optionally, the first elastic member 1331 can be a spring, a spring sheet, a torsion spring, etc., as long as it can continuously apply pressure to the engaging seat 134.

[0203] Reference ​, within the cavity of the connecting end portion 1333 of the fixed seat 133, there is a first connecting shaft 13334. In the third connecting groove 1342 of the engaging seat 134, there is also a protruding portion 13424. Two opposite second convex portions 13421 and two opposite second concave portions 13422 are located around the protruding portion 13424. The protruding portion 13424 has a mating hole 13425. The first connecting shaft 13334 is inserted into the mating hole 13425, and the engaging seat 134 can pivot relative to the fixed seat 133 around the axis of the mating hole 13425. One of the outer edge of the first connecting shaft 13334 and the inner edge of the mating 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 mating 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 engaging seat 134 relative to the fixed seat 133, avoiding excessive rotation of the engaging seat 134.

[0204] In ​ and ​ In the present embodiment shown, the limiting rib 13335 is provided on the first connecting shaft 13334, and the limiting groove 13426 is provided in the mating hole 13425. The included angle between the two circumferential ends of the limiting groove 13426 is approximately 90°. Thus, through the cooperation of the limiting groove 13426 and the limiting rib 13335, the engaging seat 134 is allowed to rotate approximately 90° to rotate between the deployed position and the retracted position. Specifically, when the engaging seat 134 is in the (for example ​ shown) retracted position, the limiting rib 13335 abuts against one end of the limiting groove 13426, thereby restricting the rotation of the engaging seat 134 in the counterclockwise (refer to ​ the direction D3) direction. The engaging seat 134 can only rotate in the clockwise direction (refer to ​ the direction D4); rotate the engaging seat 134 approximately 90° in the clockwise direction, and the engaging seat 134 reaches the ​ shown deployed position. At this time, the limiting rib 13335 abuts against the other end of the limiting groove 13426, thereby restricting the engaging seat 134 from continuing to rotate in the clockwise (refer to ​ the direction D4) direction. The engaging seat 134 can only rotate in the counterclockwise direction (refer to ​ the direction D3) and rotate back to the retracted position. Those skilled in the art can understand that the approximately 90° rotation range in this embodiment is only exemplary. Those skilled in the art can set other appropriate rotation ranges as needed. For example, the included angle between the two circumferential ends of the limiting groove 13426 can be set to approximately 180°. Thus, when the engaging seat 134 reaches the ​ shown deployed position, the engaging seat 134 rotates in the clockwise (refer to ​Rotate approximately 90° again in the direction D4) to move away from the deployed position to another retracted position.

[0205] Continue to refer to ​ , in one embodiment, the end cap 1335 has a second connecting shaft 13351 extending towards the fixed seat 133. The end cap 1335 can be connected to the fixed seat 133 by a fastener (not shown), such as a rivet, passing through the first connecting shaft 13334 and the second connecting shaft 13351.

[0206] Refer to ​ and ​ , the connecting end 1333 is provided with a locking hole 1332. The engaging seat 134 includes an installation cavity 1343 and a unlocking operation member 1341. The unlocking operation member 1341 is slidably disposed in the installation cavity 1343. The unlocking operation 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 to lock the engaging seat 134 in the deployed position. The pressing portion 13413 is connected to the locking portion 13411. By applying pressure to the pressing portion 13413, the unlocking operation member 1341 slides in a direction away from the locking hole 1332, causing the locking portion 13411 to disengage from the locking hole 1332 to release the locking of the engaging seat 134. Optionally, the installation cavity 1343 is provided with a sliding groove 13431. The unlocking operation member 1341 is slidably connected to the sliding groove 13431 through a pin shaft 13412. Thus, the unlocking operation member 1341 can slide along the length direction of the sliding groove 13431 to enable the locking portion 13411 to enter or exit the locking hole 1332. Optionally, the engaging seat 134 includes a second elastic member 13414. One end of the second elastic member 13414 is fixed inside the installation cavity 1343, and the other end of the second elastic member 13414 abuts against the unlocking operation member 1341. The second elastic member 13414 continuously applies pressure to the unlocking operation member 1341, causing the unlocking operation member 1341 to have a tendency to slide towards the third connecting groove 1342. Optionally, the second elastic member can be a spring, a spring piece, a torsion spring, etc., as long as it can continuously apply pressure to the unlocking operation 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 inside the engaging seat 134, and the installation cavity 1343 is provided in this installation space.

[0207] Refer to ​, in one embodiment, the seat fixing mechanism 132 includes: a fixed seat 233 and a clamping seat 234. The clamping seat 234 is pivotally connected to the fixed seat 233, and the clamping seat 234 can pivot between a retracted position and an extended position. Specifically, the stroller includes a support frame 13, and a seat fixing mechanism 132 is connected to each of the two side rods (i.e., the rods extending substantially along the length direction L) of the support frame 13, as ​ shown. For the convenience of description, in the following description, only one seat fixing mechanism 132 will be 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 between the retracted position and the extended position simultaneously. It should be noted that in actual use, the clamping seats 234 of the seat fixing mechanisms 132 provided on the two side rods pivot between the retracted position and the extended position simultaneously, which is intended to facilitate the folding operation of the stroller and for connecting the seat 135. Refer to ​ and ​ , which is required by the actual use scenario, but this does not mean that the two clamping seats 234 cannot pivot independently.

[0208] Continuing to refer to ​ , in one embodiment, the clamping seat 234 includes: a engaging portion 2346 and a base portion 2349. The engaging portion 2346 is configured to be inserted into an engaging groove (not shown) of the seat 135. The base portion 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 portion 2349 are integrally formed. Optionally, referring to ​ , there is an arc-shaped transition region between the engaging portion 2346 and the base portion 2349, and the width of the engaging portion 2346 is less than the width of the base portion 2349 to fit the shape of the side wall of the seat 135.

[0209] Refer to ​ , in one embodiment, when the clamping seat 234 is in the retracted position, the distance between the engaging portions 2346 of the two clamping seats 234 is L1, and the distance between the base portions 2349 of the two clamping seats 234 is L2. Refer to ​ . Optionally, the range of L1 is approximately 359.46 mm ≤ L1 ≤ 439.34 mm, for example, L1 is approximately 399.4 mm; the range of L2 is approximately 329.4 mm ≤ L2 ≤ 402.6 mm, for example, L2 is approximately 366 mm. It should be noted that in this embodiment, since when the clamping seat 234 is in the retracted position, the engaging portions 2346 of the two clamping seats 234 are located below the two side rods of the support frame 13 and are respectively blocked by the two side rods at least partially. ​The distance between the two engaging portions 2346 identified in the figure is close to the distance between the two side rods of the support frame 13. Those skilled in the art can understand that the distance between the two side rods of the support frame 13 can be changed according to actual needs to change the size of L1. When the engaging seat 234 is in the deployed position, the distance between the engaging portions 2346 of the two engaging seats 234 is L1', and the distance between the bases 2349 of the two engaging seats 234 is L2'. Refer to ​ . Optionally, 301.86 mm ≤ L1' ≤ 368.94 mm. L1' is, for example, approximately 335.4 mm; L2' is, for example, approximately 302 mm. Those skilled in the art can understand that in actual use, the size of L1' can be selected according to the distance between the two engaging grooves of the seat 135 to be fixed. When pivoting from the deployed position to the retracted position, the distance between the two engaging seats 234 increases by ΔL (i.e., L1 - L1') or ΔL (i.e., L2 - L2'). For example, ΔL is approximately 44 mm. Compare with reference ​ and ​ . The engaging seat 234 in the retracted position is lower than the upper surface of the fixed seat 233 in the height direction H, that is, it is located below the corresponding side rod of the support frame 13. Refer to ​ . Compared with the embodiment shown in ​ , the two engaging seats 234 in this embodiment have a larger distance L1 in the retracted position, so the encroachment on the space between the two side rods of the support frame 13 is smaller. On the one hand, this is beneficial to reducing the interference of the engaging seat 234 on other components of the stroller when the stroller is retracted. On the other hand, the seat may not be needed during the use of the stroller. The increase in the distance between the two engaging seats 234 in the retracted position is beneficial to reducing the interference of the engaging seat 234 on the user's operation. For example, it reduces the interference and obstruction of the engaging seat 234 on the activities of children sitting in the carriage formed by the support frame 13 and the fabric cover, or reduces the interference and obstruction of the engaging seat 234 on the user when placing and taking items on the support frame. The seat 135 according to this embodiment is the same as the seat 135 according to the embodiment shown in ​ .

[0210] Refer to ​ , in one embodiment, a first card hole 2347 is provided at the upper end of the engaging portion 2346 and / or a second card hole 2348 is provided at the lower end of the base 2349. The first card hole 2347 is used to engage with the rod in the engaging groove of the seat 135 to stably fix the seat 135 installed on the stroller and prevent it from shaking. The second card hole 2348 is used to cooperate with the engaging protrusion of the seat 135 to make the fixation of the seat 135 more stable.

[0211] Refer to ​, in one embodiment, the fixing base 233 is provided with a pivot shaft 235, and the engaging base 234 is provided with a mounting hole 2343. The mounting hole 2343 is sleeved on the pivot shaft 235, and the engaging base 234 can pivot around the pivot shaft 235 and slide 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 fixing base 233 is provided with the mounting hole 2343, and the engaging base 234 is provided with the pivot shaft 235. When the engaging base 234 pivots to the retracted position, in the height direction H, the engaging base 234 does not protrude from the upper surface of the fixing base 233. Optionally, refer to ​, the engaging seat 234 pivots to the retracted position, and in the height direction H, the engaging seat 234 is lower than the upper surface of the fixed seat 233. Optionally, the fixed 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 is engaged in the limiting hole 2344. Optionally, the positions of the limiting portion 2333 and the limiting hole 2344 can be interchanged, that is, the fixed 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, and the plurality of elastic members 23331 are spaced apart. The end of each elastic member 23331 away from the fixed seat 233 is convex and provided with a guiding inclined surface 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 inclined surface 23332, causing the elastic member 23331 to deform towards the spaced space between the elastic members 23331. After the elastic member 23331 is inserted into the limiting hole 2344, due to the elastic restoring force of the elastic member 23331 itself, the elastic member 23331 presses against the inner wall of the limiting hole 2344, and the convex end passes through the limiting hole 2344 and abuts against the peripheral wall of the limiting hole 2344, thereby preventing the elastic member 23331 from disengaging from the limiting hole 2344. During actual use, the user applies a certain pulling force to the engaging seat 234 to overcome the movement restriction between the convex end and the limiting hole, so that the engaging seat 234 slides in a direction away from the fixed seat 233. Optionally, the fixed 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 the groove body 2340 matches the shape of the connecting body 2330. Specifically, the connecting body 2330 is provided to protrude from the side of the fixed 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 fixed seat 233. When the engaging seat 234 is in the retracted position, the connecting body 2330 and the groove body 2340 are misaligned with each other. When it is necessary to pivot the engaging seat 234 to the deployed position, the user applies a pulling force to the engaging seat 234, so that the elastic member 23331 disengages from the limiting hole 2344, and the engaging seat 234 slides in a direction away from the fixed seat 233, and one end of the connecting body 2330 and one end of the groove body 2340 are aligned with each other; then the user rotates the engaging seat 234, so that the connecting body 2330 gradually enters the groove body 2340; when the engaging seat 234 rotates to the deployed position, the connecting body 2330 is completely fitted in the groove body 2340. Optionally, the positions of the connecting body 2330 and the groove body 2340 can be interchanged, that is, the fixed seat 233 is further provided with the groove body 2340, and the engaging seat 234 is provided with the connecting body 2330. Optionally, the connecting body 2330 is provided with a first connecting groove 2331 and a first connecting edge 2332, and the groove body 2340 is provided with 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 receives 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-shaped 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 against the engaging seat 234 and continuously applies pressure to the engaging seat 234, so that the engaging seat 234 has a tendency to slide toward the fixed seat 233. In other embodiments, the third elastic member can be omitted, and the engaging seat 234 is moved along the pivot axis 235 toward the fixed seat 233 by the user's pushing operation.

[0212] The following will be described separately ​ the embodiments shown in ​ and the working principles of the embodiments shown in

[0213] For ​ the stroller in the embodiment shown in, when the seat 135 is not installed, the engaging seat 134 of the seat fixing mechanism 132 is in the retracted position as shown in ​ . At this time, the seat fixing mechanisms 132 on both sides of the stroller have a relatively large spacing L1 (or L2). When it is necessary to install the seat 135, if necessary, the accessories interfering with the seat 135 need to be removed, such as removing the dinner plate assembly 130; if the dinner plate assembly 130 does not interfere with the assembly of the seat 135, it is not necessary to remove the dinner plate assembly 130. The user pivots the engaging seat 134 from the retracted position to the deployed position. During the pivoting process, due to the cooperation between the connecting end portion 1333 and the third connecting groove 1342, the engaging seat 134 also slides in a direction away from the fixed seat 133 at the same time, that is, the engaging seats 134 on both sides of the stroller slide toward each other. As a result, the spacing between the seat fixing mechanisms 132 on both sides of the stroller is reduced to L1' (or L2') to match the spacing between the two engaging 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 to lock the engaging seat 134 in the deployed position. At this time, the engaging portion 1346 is inserted into the engaging groove of the seat 135, and the rear of the backrest of the seat 135 can be further snapped onto the support frame 13 (as shown in ​As shown, the seat 135 is also snap-connected to the front rod of the support frame 13, completing the fixed installation of the seat 135. When the seat 135 is not needed, the engaging portion 1346 is pulled out from the engaging 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, so that the locking portion 13411 exits the locking hole 1332, and then pivots the engaging seat 134 towards the retracted position. Under the action of the first elastic member 1331, the engaging seat 134 slides towards the fixed 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.

[0214] For ​ the stroller in the embodiment shown, when the seat 135 is not installed, the engaging seat 234 of the seat fixing mechanism 132 is in the retracted position as shown in ​ At this time, the engaging seat 234 is lower than the upper surface of the fixed seat 233 in the height direction H, and the seat fixing mechanisms 132 on both sides of the stroller have a larger spacing L1 (or L2). When it is necessary to install the seat 135, if necessary, the accessories interfering with the seat 135 need to be disassembled, such as disassembling the dining plate assembly 130. Then, the user pivots the engaging seat 234 from the retracted position to the deployed position. Specifically, the user first pulls the engaging seat 234 in a direction away from the fixed seat 233, so that the limiting portion 2333 disengages from the limiting hole 2344. Thus, the spacing between the seat fixing mechanisms 132 on both sides of the stroller is reduced to L1' (or L2') to adapt to the spacing between the two engaging grooves of the seat 135. Then, the user pivots the engaging seat 234 towards 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. Thus, the arc-shaped connecting body 2330 gradually enters and fits into the groove body 2340. When the engaging seat 234 pivots to the deployed position, the limiting member 2345 is snap-fitted in the limiting recess 2334, and the engaging seat 234 is locked in the deployed position. At this time, the engaging portion 2346 is inserted into the engaging groove of the seat 135, and the rear of the backrest of the seat 135 can be further snapped onto the support frame 13 to complete the fixed installation of the seat 135. When the seat 135 is not needed, the engaging portion 2346 is pulled out from the engaging groove of the seat 135, and the seat 135 is removed. The user pivots the engaging seat 234 towards the retracted position. Under the action of the third elastic member or the user's pushing operation, the engaging seat 234 slides towards the fixed seat 233. When the engaging seat 234 pivots to the retracted position, the seat fixing mechanisms 132 on both sides of the stroller are increased to L1 (or L2) again.

[0215] Refer to ​ and ​, an embodiment of the present application provides a storage assembly 3. The storage assembly 3 is provided on, for example, the handlebar 14. Specifically, the storage assembly 3 includes: a mounting bracket 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 generally U-shaped, and the extension rod 145 is straight tubular 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 relative to each other through the pivot assembly 4, thereby reducing the volume after the cart is folded. 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, the 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 and allowing the push handle 142 to pivot relative to the extension rod 145. Any known locking and unlocking mechanism in the art can be used for the locking and unlocking mechanism between the push handle 142 and the extension rod 145, and the present application does not limit this. 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 provided at other positions of the handlebar 14 according to actual needs, such as the extension rod 145, the push handle 142, etc., or fixedly provided at other parts of the frame, such as the rear foot rod 12, the support frame 13, etc., as long as the storage assembly 3 does not interfere with the folding of the frame. The storage assembly 3 according to this embodiment can be installed in ​ any of the embodiments shown.

[0216] In ​ and ​In the illustrated embodiment, a first protruding portion 302 and a second protruding portion 303 protruding from the outer wall 301 are sequentially provided on the outer wall 301 of the mounting bracket 30. The first protruding portion 302 and the second protruding portion 303 form a substantially umbrella-shaped structure. Among them, the first protruding portion 302 is radially retracted relative to the second protruding portion 303, thereby forming a first engaging groove 304 between the side of the second protruding portion 303 facing the vehicle frame and the outer wall 301 of the mounting bracket 30. The container 31 is provided with an engaging mechanism 32 for detachably connecting to the mounting bracket 30. Specifically, the engaging mechanism 32 includes: an engaging edge 321, and the engaging edge 321 forms a substantially U-shaped second engaging groove 324. On each of the opposite two edges of the substantially U-shaped second engaging groove 324, for example, a locking protrusion 322 is provided. Thus, the two locking protrusions 322 divide the second engaging groove 324 into a guiding 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 protruding portion 302; the shape of the engaging portion 3242 is formed to be similar to the outer peripheral shape of the first protruding portion 302, and the radial dimension of the engaging portion 3242 is basically equal to (or slightly larger than) the radial dimension of the first protruding portion 302. Thus, when the first protruding portion 302 can be received in the engaging portion 3242; the guiding portion 3241 has an opening 3243 (i.e., the opening 3243 of the substantially U-shaped second engaging groove 324), and the radial dimension of the guiding portion 3241 is larger than the radial dimension of the first protruding portion 302. Preferably, the radial dimension of the guiding portion 3241 is larger than the radial dimension of the first protruding portion 302 and smaller than the radial dimension of the second protruding portion 303. When installing the container 31, align the opening 3243 of the second engaging groove 324 with the first protruding portion 302 so that the first protruding portion 302 enters the guiding portion 3241. Continue to move the container 31 so that the first protruding portion 302 contacts the two locking protrusions 322. At this time, since the distance between the two locking protrusions 322 is slightly smaller than the radial dimension of the first protruding portion 302, the first protruding portion 302 abuts against the two locking protrusions 322. The external force applied by the user to continue to drive the container 31 to move causes the first protruding portion 302 to squeeze the two locking protrusions 322, which will cause the two locking protrusions 322 to deform in a direction away from each other, so that the first protruding portion 302 enters the engaging portion 3242 of the second engaging groove 324. When the first protruding portion 302 completely enters the engaging portion 3242, the first protruding portion 302 is received in the engaging portion 3242, and the first protruding portion 302 no longer squeezes the two locking protrusions 322. Thus, the two locking protrusions 322 are reset under the action of their own elastic restoring force. At this time, a part of the engaging edge 321 enters the first engaging groove 304, and the first protruding portion 302 is received and locked in the engaging portion 3242. Thus, the container 31 is fixed on the mounting bracket 30, and the storage assembly 3 is completed for installation.

[0217] In one embodiment, optionally, a deformation groove 323 is provided at a portion of the engaging edge 321 close to the locking projection 322. When the first protrusion 302 presses the locking projection 322, the deformation groove 323 helps the locking projection 322 to deform in a direction away from the other locking projection 322. Optionally, the container 31 can be any type of container such as a cup holder, a storage basket, etc. Optionally, a support rib 33 is provided on the outer wall of the container 31 close to 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 to make the locking more secure.

[0218] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0219] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A drawbar mechanism, characterized in that, Comprising: A third connecting seat; A rotating part, the rotating part is connected to the third connecting seat and can pivot relative to the third connecting seat between a first pivot position and a second pivot position; a pull rod, one end of the pull rod is connected to the rotating part, when the rotating part pivots to the first pivot position, the pull rod pivots to an upright position; when the rotating part pivots to the second pivot position, the pull rod pivots to a lying position; And a first positioning member, the first positioning member is arranged between the third connecting seat and the rotating part, and the first positioning member is configured to limit the pivoting of the rotating part.

2. The drawbar mechanism according to claim 1, characterized in that, The first positioning member is a damping sheet, and the damping sheet is clamped between the rotating part and the third connecting seat.

3. The drawbar mechanism according to claim 2, wherein One end of the third connecting seat is recessed inward to form a pivoting space, at least a part of the rotating part is received in the pivoting space, and the damping sheet is clamped between the rotating part and the side wall of the pivoting space.

4. The drawbar mechanism according to claim 3, wherein The pivoting space includes two relatively arranged side walls, at least a part of the rotating part is located between the two side walls of the pivoting space, the first positioning member includes two damping sheets, and the two damping sheets are respectively clamped between the two side walls of the pivoting space and the rotating part.

5. The drawbar mechanism according to claim 1, characterized in that, The first positioning member includes: a positioning recess, which is arranged on one of the rotating part and the third connecting seat; and a positioning protrusion, which is arranged on the other of the rotating part and the third connecting seat, when the positioning protrusion enters the positioning recess, the pivoting of the rotating part is restricted by the shape matching of the positioning recess and the positioning protrusion.

6. The drawbar mechanism according to claim 5, wherein, One end of the third connecting seat is recessed inward to form a pivoting space, at least a part of the rotating part is received in the pivoting space, and the inner surface of at least one side wall of the pivoting space faces at least one surface of the rotating part; At least one elastic finger is provided on one of the surface of the rotating part and the side wall of the pivoting space, a plurality of the positioning recesses are provided on the other of the surface of the rotating part and the side wall of the pivoting space, the positioning protrusion is arranged on the side of the elastic finger facing the positioning recess, and the positioning protrusion is engaged with one of the plurality of positioning recesses to position the pull rod at one of a plurality of pivot angles.

7. The drawbar mechanism according to claim 1, wherein, One end of the third connecting seat is recessed inward to form a pivoting space, at least a part of the rotating part is received in the pivoting space, and a limiting groove is provided on the inner wall of the pivoting space of the third connecting seat; a limiting protrusion is provided on the rotating part, and the limiting protrusion slides in the limiting groove as the rotating part pivots, 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 further pivoting of the rotating part.

8. The drawbar mechanism according to claim 1, characterized in that, Further comprising: A slide rail, the third connecting seat is connected to the slide rail and can slide along the slide 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 an extended position; when the third connecting seat slides to the second sliding position, the pull rod slides to a storage position.

9. The drawbar mechanism according to claim 8, characterized in that, Further comprising: A locking device is provided between the third connecting seat and the slide rail, and the locking device is configured to lock the third connecting seat at the first sliding position and / or the second sliding position.

10. The pull rod mechanism according to claim 9, characterized in that, The third connecting seat is provided with a first through hole slidably sleeved on the slide rail. The locking device includes: a second through hole provided on the side wall of the first through hole; a second positioning hole provided on a portion of the slide rail corresponding to the first sliding position of the third connecting seat; a second positioning member provided in the slide rail, at least a part of the second positioning member being slidable in the second positioning hole to retract from and protrude into the second positioning hole; when the third connecting seat slides to the first sliding position, at least a part of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat at the first sliding position.

11. The drawbar mechanism according to claim 9, characterized in that, The third connecting seat is provided with the first through hole slidably sleeved on the slide rail. The locking device includes: a second through hole provided on the side wall of the first through hole; a third positioning hole provided on a portion of the slide rail corresponding to the second sliding position of the third connecting seat; a third positioning member provided in the slide rail, at least a part of the third positioning member being slidable in the third positioning hole to retract from and protrude into the third positioning hole; when the third connecting seat slides to the second sliding position, at least a part of the third positioning member protrudes from the third positioning hole and enters the second through hole to lock the third connecting seat at the second sliding position.

12. The drawbar mechanism according to claim 9, wherein Further included is: a fixing portion, the slide rail being connected to the fixing portion. When the rotating portion pivots from the second pivoting position to the first pivoting position, the pull rod abuts against the front surface of the fixing portion to limit further pivoting of the rotating portion.

13. A trolley, comprising: a chassis; and a pull rod mechanism according to any one of claims 1-12, the pull rod mechanism being connected to the chassis.

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