Pull rod mechanism and stroller

Abstract

This application relates to a lever mechanism, comprising: a third connecting seat; a rotating part connected to the third connecting seat and capable of pivoting relative to the third connecting seat between a first pivot position and a second pivot position; a lever, one end of which is connected to the rotating part, wherein when the rotating part pivots to the first pivot position, the lever pivots to an upright position; and when the rotating part pivots to the second pivot position, the lever pivots to a reclining position; and a first positioning member disposed between the third connecting seat and the rotating part, the first positioning member being configured to restrict the pivoting of the rotating part.

Description

Technical Field

[0001] This application relates to the field of children's vehicle technology, and in particular to a frame, a lever mechanism, a seat fixing mechanism, and a stroller. Prior Technology

[0002] Strollers, such as campervans and children's strollers, are popular with consumers because they can accommodate infants and toddlers while carrying items. However, many strollers on the market have the problem of being unable to fold or being inconvenient to fold. For ease of use, strollers are generally equipped with a pull handle for users to pull the stroller. However, the pull handles of current strollers are not convenient for users to operate, necessitating the design of a new pull handle mechanism and a stroller with this feature. In addition, strollers can generally be equipped with seating devices such as car seats and infant carriers for children to sit in. However, the seat fixing mechanisms in current strollers are complex in structure, and the seat fixing mechanism cannot be folded without the seat device installed, thus affecting the use and folding of the stroller. Summary of the Invention

[0003] Therefore, it is necessary to provide a frame that can be quickly folded up, a lever mechanism that facilitates user operation, a seat fixing mechanism that is simple in structure and easy to fold up, and a trolley to address at least one of these technical problems.

[0004] According to one aspect of this application, a frame is provided comprising: a chassis; a front leg, the lower end of which is pivotally connected to the chassis; a rear leg, the lower end of which is pivotally connected to the chassis; and a rider, the lower end of which is pivotally connected to the upper end of the front leg, and the upper end of the rear leg pivotally connected to the rider; when the frame is switched from an extended state to a retracted state, the rider pivots relative to the front leg, and drives the front leg and the rear leg to pivot relative to the chassis, so that the rider, the front leg, and the rear leg are retracted toward the chassis.

[0005] According to the embodiments of this application, the frame can be easily and quickly folded by simply pushing the rider when it is folded.

[0006] In one embodiment, when the frame switches from an extended state to a retracted state, the rider and rear leg pivot towards the front of the frame, and the front leg pivots towards the rear of the frame.

[0007] In one embodiment, as the frame switches from an extended state to a retracted state, the angle between the rider and the rear footrest 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 leg, the locking joint being configured to lock the rider and the front leg to prevent relative pivoting of the rider and the front leg; and a release mechanism disposed on the rider and configured to release the locking of the locking joint on the rider and the front leg to allow relative pivoting of the rider and the front leg.

[0009] In one embodiment, the locking joint includes: a first connecting seat, the upper end of which is connected to a rider; a second connecting seat, the lower end of which is connected to a front footrest, 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 locked position in which the locking member locks the first connecting seat and the second connecting seat to prevent relative pivoting of the first connecting seat and the second connecting seat.

[0010] In one embodiment, the release mechanism includes: a release actuating member disposed on the driver's hand and operably connected to a locking member, the release actuating member being configured to drive the locking member to a release position to release the locking member from locking the first connecting seat and the second connecting seat, allowing the first connecting seat and the second connecting seat to pivot relative to each other.

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

[0012] In one embodiment, the release mechanism further includes: a first connector, one end of which is connected to the release operation member, and the other end of which is connected to the locking member, wherein the release operation member drives the locking member to slide to the release position via the first connector.

[0013] In one embodiment, one end of the second connector has a first locking groove and a first locking protrusion, and one end of the locking member has a second locking protrusion and a second locking groove. When the locking member is in the locked position, the second locking protrusion engages in the first locking groove, and the first locking protrusion engages in the second locking groove.

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

[0015] In one embodiment, the frame further includes a linkage, one end of which is pivotally connected to a support frame, and the other end of which is pivotally connected to a rear footrest. The pivot point of the rear footrest and the rider is located on the rider's side facing inwards from the frame, and the projection of the pivot trajectory of the rear footrest along the height direction does not overlap with the projection of the pivot trajectory of the front footrest and / or the rider along the height direction.

[0016] In one embodiment, when the frame switches from the extended state to the retracted state, the linkage pivots toward the rear of the frame, the rear foot lever pivots toward the front of the frame, and the angle between the linkage and the rear foot lever gradually increases.

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

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

[0019] In one embodiment, when the frame switches from the extended state to the retracted state, the linkage pivots toward the rear of the frame, the rear foot lever pivots toward the front of the frame, and the angle between the linkage and the rear foot lever gradually increases.

[0020] In one embodiment, the chassis includes two first rods that extend generally along the length direction and have a first bend that protrudes toward the interior of the chassis to form a first clearance space. When the chassis is in a retracted state, at least a portion of the front leg rod is located within the first clearance space.

[0021] In one embodiment, a second bend is formed on the rear footrest, protruding toward the rear of the frame to create a second clearance space, in which at least a portion of the rider is located when the frame is in the retracted state.

[0022] In one embodiment, the base frame further includes two second rods extending generally along the width direction. The two first rods and the two second rods form a generally rectangular structure. A second reinforcing rod is disposed between the two first rods, and the two ends of the second reinforcing rod are respectively connected to the first bends of the two first rods.

[0023] In one embodiment, the base frame includes: two first rods extending generally along the length direction; two second rods extending generally along the width direction; and at least one first reinforcing rod disposed between the two first rods.

[0024] According to another aspect of this application, a trolley is provided, which includes the frame of at least one of the foregoing embodiments.

[0025] According to the embodiments of this application, when the trolley is folded up, the frame of the trolley can be easily and quickly folded up simply by pushing the rider.

[0026] According to another aspect of this application, a lever mechanism is provided, comprising: a third connecting seat; a rotating part connected to the third connecting seat and pivotable relative to the third connecting seat between a first pivot position and a second pivot position; a lever, one end of which is connected to the third rotating part. When the rotating part pivots to the first pivot position, the lever pivots to an upright position; when the rotating part pivots to the second pivot position, the lever pivots to a reclining position; and a first positioning member disposed between the third connecting seat and the rotating part, the first positioning member being configured to restrict the pivoting of the rotating part.

[0027] The lever mechanism according to the embodiments of this application can be easily adjusted and positioned for use, realizing the adjustment of the lever's angle of use, and is convenient to operate and widely applicable.

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

[0029] In one embodiment, one end of the third connector is recessed inward to form a pivot space, at least a portion of the rotating part is housed in the pivot space, and a damping plate is clamped between the rotating part and the sidewall of the pivot space.

[0030] In one embodiment, the pivot space includes two sidewalls arranged opposite to each other, at least a portion of the rotating part is located between the two sidewalls of the pivot space, and the first positioning member includes two damping plates, which are respectively clamped between the two sidewalls of the pivot space and the rotating part.

[0031] In one embodiment, the first positioning element includes: a positioning recess disposed in one of the rotating part and the third connecting seat; and a positioning protrusion disposed in the other of the rotating part and the third connecting seat, wherein when the positioning recess enters the positioning protrusion, the rotation 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 portion 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; one of the surface of the rotating part and the side wall of the pivot space is provided with at least one elastic finger, and the other of the surface of the rotating part and the side wall of the pivot space is provided with a plurality of positioning recesses, and a positioning protrusion is provided on the side of the elastic finger facing the positioning recess, and the positioning protrusion engages with one or more positioning recesses to position the pull rod 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 pivot space, at least a portion of the rotating part is housed in the pivot space, and a limiting groove is provided on the inner wall of the pivot space of the third connecting seat; the rotating part is provided with a limiting protrusion, which slides in the limiting groove as the rotating part pivots, wherein when the rotating part pivots from the first pivot position to the second pivot position, the limiting protrusion abuts against the side wall of the limiting groove to limit the rotating part from continuing to pivot.

[0034] In one embodiment, the lever mechanism further includes: a slide rail, a third connecting seat connected to the slide rail and capable of sliding 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 lever slides to the extended position; when the third connecting seat slides to the second sliding position, the lever slides to the retracted position.

[0035] In one embodiment, the lever mechanism further includes a locking device disposed on the third connecting seat and the slide rail, the locking device being used to lock the third connecting seat in a first sliding position and / or a second sliding position.

[0036] In one embodiment, the third connecting seat is provided with a first through hole slidably fitted onto the slide rail. The locking device includes: a second through hole disposed on the side wall of the first through hole; a second positioning hole disposed on the portion of the slide rail corresponding to the first sliding position of the third connecting seat; and a second positioning member disposed within the slide rail, at least a portion of which is slidable within the second positioning hole to retract and protrude from the second positioning hole. When the third connecting seat slides to the first sliding position, at least a portion of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat in the first sliding position.

[0037] In one embodiment, the third connecting seat is provided with a first through hole slidably fitted onto the slide rail. The locking device includes: a second through hole disposed on the side wall of the first through hole; a third positioning hole disposed on the portion of the slide rail corresponding to the second sliding position of the third connecting seat; and a third positioning member disposed within the slide rail, at least a portion of which is slidable within 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 portion of the third positioning member protrudes from the third positioning hole and enters the second through hole to lock the third connecting seat in the second sliding position.

[0038] In one embodiment, the lever mechanism further includes a fixed part, and a slide rail is connected to the fixed part. When the rotating part pivots from the second pivot position to the first pivot position, the lever abuts against the front surface of the fixed part to limit the rotating part from continuing to pivot.

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

[0040] In one embodiment, one end of the third connector is recessed inward to form a pivot space, the shape of which is set to be approximately cylindrical to match the shape of the main body of the rotating part, and the main body of the rotating part is pivotally disposed within the pivot space.

[0041] In one embodiment, the other end of the third connector is provided with a first through hole, which is slidably fitted onto the slide rail.

[0042] In one embodiment, a second through hole is provided on the sidewall of the first through hole; a second positioning hole is provided on the portion of the slide rail corresponding to the first sliding position of the third connecting seat; a second positioning member is provided inside the slide rail; at least a portion of the second positioning member is slidable within the second positioning hole to retract and protrude from the second positioning hole. When the third connecting seat slides to the first sliding position, at least a portion of the second positioning member protrudes from the second positioning hole and enters the second through hole to lock the third connecting seat in the first sliding position.

[0043] In one embodiment, the second positioning element is a spring sheet having a first protrusion that is slidable within a second positioning hole.

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

[0045] In one embodiment, the third positioning element is a spring sheet having a second protrusion that is slidable within a third positioning hole.

[0046] In one embodiment, a limiting protrusion is provided on the cylindrical curved surface of the main body of the rotating part. A limiting groove is provided on the inner wall of the pivoting space of the third connecting seat. When the rotating part pivots, the limiting protrusion slides in the limiting groove. When the rotating part 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 rotating part from continuing to pivot.

[0047] In one embodiment, the lever mechanism further includes a fixed portion, to which a slide rail is connected. When the rotating portion pivots from a second pivot position to a first pivot position, the lever abuts against the front surface of the fixed portion to limit further pivoting of the rotating portion.

[0048] In one embodiment, the lever mechanism further includes a front lever and a rear lever, each with a fixed portion, and the two ends of the slide rail are respectively connected to the two fixed portions. When the rotating part pivots from the second pivot position to the first pivot position, the lever abuts against the front surface of the fixed portion of the front lever to limit further pivoting of the rotating part.

[0049] In one embodiment, the lever mechanism further includes at least one storage component disposed on the front lever, and the storage component having a storage groove. When the lever slides to the storage position, at least a portion of the lever is stored in the storage groove.

[0050] In one embodiment, the pull rod includes: a connecting rod, one end of which is connected to a rotating part; and a handle, which is connected to the other end of the connecting rod. When the pull rod slides to the retracted position, the handle is retracted into a storage slot.

[0051] In one embodiment, two storage components are provided, which are separated by a fixing part provided on the front rod, and the openings of the storage slots of the two storage components are arranged opposite to each other.

[0052] In one embodiment, a storage component is provided, which is disposed on the lower side of the fixing part, and the opening of the storage slot of the storage component faces the front of the fixing part.

[0053] In one embodiment, the first positioning element is a damping plate, which is clamped between the end face of the main body of the rotating part and the inner surface of the side wall of the pivot space facing the rotating part.

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

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

[0056] In one embodiment, the first positioning element includes: a positioning recess disposed on one of the end face of the main body of the rotating part and the inner wall of the pivoting space; and a positioning protrusion disposed on the other of the end face of the main body of the rotating part and the inner wall of the pivoting space. 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.

[0057] According to another aspect of this application, a trolley is provided, comprising: a base frame and a lever mechanism as described in the foregoing embodiments. The lever mechanism is connected to the base frame.

[0058] The pull rod mechanism of the trolley according to the embodiments of this application can be easily adjusted and positioned for use, and the angle of the pull rod can be adjusted. It is easy to operate and has wide applicability.

[0059] According to one aspect of this application, a seat fixing mechanism is provided, comprising: a fixed base; and a locking base, the locking base being slidably connected to the fixed base, the locking base being movable relative to the fixed base between a folded position and an unfolded position, the locking base being further away from the fixed base in the unfolded position than in the folded position. The seat fixing mechanism according to the embodiment of this application has a simple structure, is easy to fold, and does not interfere with other components of the trolley.

[0060] In one embodiment, the locking seat includes: an engagement portion configured to insert into an engagement groove in the seat; and a base connected to the engagement portion and pivotally connected to a retaining seat. An arcuate transition region exists between the engagement portion and the base, and the width of the engagement portion is less than the width of the base.

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

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

[0063] In one embodiment, the end of the connecting end facing the locking seat has at least one first protrusion and at least one first recess, with a first inclined surface between the first protrusion and the first recess. The bottom wall of the third connecting groove has at least one second protrusion and at least one second recess, with a second inclined surface between the second protrusion and the second recess. When the locking seat is in the closed position, the second protrusion engages in the first recess, and the first protrusion engages in the second recess. When the locking seat pivots from the closed position to the unfolded position, the first protrusion disengages from the second recess. Through the engagement of the second inclined surface and the first inclined surface, the first protrusion slides to a position abutting against the second protrusion, and the locking seat slides away from the fixed seat.

[0064] In one embodiment, the end of the connecting end facing the locking seat has two opposing first protrusions and two opposing first recesses, the two first protrusions being spaced apart by the two first recesses, and a first inclined surface is provided between adjacent first protrusions and first recesses. The bottom wall of the third connecting groove has two opposing second protrusions and two opposing second recesses, the two second protrusions being spaced apart by the two second recesses, and a second inclined surface is provided between adjacent second protrusions and second recesses. When the locking seat is in the retracted position, the two second protrusions respectively engage with the two first recesses. When the locking seat pivots from the retracted position to the unfolded position, the first protrusions disengage from the second recesses, and through the engagement of the second inclined surface and the first inclined surface, the first protrusions slide to a position abutting against the second protrusions, and the locking seat slides away from the fixed seat.

[0065] In one embodiment, the locking seat is provided with a mounting through hole, and an end cap and a first elastic member are disposed in the mounting through hole. 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 locking seat, so that the locking seat has a tendency to slide toward the fixed seat.

[0066] In one embodiment, the connecting end is provided with a locking hole, and the locking seat includes a release operation member. When the locking seat is pivoted to the unfolded position, at least a portion of the release operation member enters the locking hole to lock the locking seat in the unfolded position.

[0067] In one embodiment, the locking seat includes a mounting cavity in which a release actuation element is slidably disposed. The release actuation element includes: a locking portion that engages with a keyhole when the locking seat is pivoted to the unfolded position to lock the locking seat in the unfolded position; and a pressing portion connected to the locking portion, wherein applying pressure to the pressing portion causes the release actuation element to slide away from the keyhole, thereby disengaging the locking portion from the keyhole and releasing the lock on the locking seat.

[0068] In one embodiment, the locking seat includes a second elastic member, one end of which is fixed in the mounting cavity and the other end of which abuts against the release operation member. The second elastic member continuously applies pressure to the release operation member, causing the release operation member to have a tendency to slide toward 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 fitted onto the pivot shaft, allowing the engaging seat to pivot about the pivot shaft and slide along the axial direction of the pivot shaft. When the engaging seat is pivoted to the closed position, it does not protrude from the upper surface of the fixed seat in the height direction.

[0070] In one embodiment, one of the fixed seat and the engaging seat is further provided with a limiting part, and the other of the fixed seat and the engaging seat is further provided with a limiting hole. When the engaging seat is pivoted to the closed state, the limiting part engages in the limiting hole.

[0071] In one embodiment, one of the fixing seat and the engaging seat is further provided with an arc-shaped connecting body, and the other of the fixing seat and the engaging seat is further provided with a groove, the shape of which matches the shape of the connecting body. When the engaging seat is pivoted to the unfolded state, the connecting body engages in the groove.

[0072] In one embodiment, one of the connector and the groove is provided with a limiting recess, and the other of the connector and the groove is provided with a limiting member. When the locking seat is pivoted to the unfolded state, the limiting member engages in the limiting recess to lock the locking seat in the unfolded position.

[0073] In one embodiment, the connector has a first connecting groove and a first connecting edge, and the connector also has a second connecting groove and a second connecting edge. When the locking seat is pivoted to the unfolded state, the second connecting groove accommodates the first connecting edge, and the second connecting edge enters the first connecting groove.

[0074] In one embodiment, a third elastic element is provided between the fixed seat and the engaging seat. The third elastic element abuts against the engaging seat and continuously applies pressure to the engaging seat, causing the engaging seat to have a tendency to slide toward the fixed seat.

[0075] According to another aspect of this application, a trolley is provided, comprising: the seat fixing mechanism of the foregoing embodiments; a support frame on which the seat fixing mechanism is fixed; and a seat detachably fixed to the seat fixing mechanism. Simple Explanation of the Diagram

[0076] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments of the invention shown in the figures. The same reference numerals throughout the figures indicate the same parts, and the figures are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

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

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

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

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

[0081] Figure 4 is a side view of the frame shown in Figure 1, in which the rider and rear footbar begin to pivot towards the front of the frame, and the front footbar begins to pivot towards the rear of the frame.

[0082] Figure 5 is a side view of the frame shown in Figure 1, in which the rider and rear footbar pivot further forward toward the frame, and the front footbar pivot further rearward toward the frame.

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

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

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

[0086] Figure 9 is a perspective view of a vehicle frame in an unfolded state according to an embodiment of this application.

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

[0088] Figure 11 is a side view of the frame shown in Figure 9, in which the sunshade is in the retracted state, the lever is in the stowed state and the rider begins to pivot towards the front of the frame, and the front foot stick begins to pivot towards the rear of the frame.

[0089] Figure 12 is a side view of the frame shown in Figure 9, in which the rider pivots further forward toward the frame, the rear kickstand begins to pivot forward toward the frame, and the front kickstand pivots further toward the rear of the frame.

[0090] Figure 13 is a side view of the frame shown in Figure 9, with the frame switched to the folded state.

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

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

[0093] Figure 16 is a side view of the trolley shown in Figure 15, showing the lever in a use position.

[0094] Figure 17 is a side view of the trolley shown in Figure 15, showing the lever in the reclining position.

[0095] Figure 18 is a top view of a lever mechanism according to an embodiment of this application.

[0096] Figure 19 is a perspective view of a trolley according to an embodiment of this application.

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

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

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

[0100] Figure 23 is a partial sectional view taken along line AA in Figure 19.

[0101] Figure 24 is a partial sectional view taken along line BB of Figure 22.

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

[0103] Figure 26 is a perspective view of the trolley shown in Figure 25, showing the lever in the stowed position.

[0104] Figure 27 is a partial sectional view taken along line CC of Figure 26, in which part of the trolley structure is omitted.

[0105] Figure 28 is a perspective view of a lever mechanism according to an embodiment of this application.

[0106] Figure 29 is a partially enlarged sectional view of the tie rod mechanism taken along the virtual plane G shown in Figure 28.

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

[0108] Figure 31 is a perspective view of a trolley according to an embodiment of the present application, wherein the card holder is in the unfolded position.

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

[0110] Figure 33 is a side view of a seat fixing mechanism according to an embodiment of the present application, wherein the locking seat is in the unfolded position.

[0111] Figure 34 is a top view of a trolley according to an embodiment of the present application, wherein the locking seat is in the folded position.

[0112] Figure 35 is a top view of a trolley according to an embodiment of the present application, wherein the card holder is in the unfolded position.

[0113] Figure 36 is a top view of a trolley with a seat installed according to an embodiment of the present application.

[0114] Figure 37 is a side view of the trolley with a seat installed as shown in Figure 36.

[0115] Figure 38 is a cross-sectional view of the seat fixing mechanism taken along line II of Figure 34, where other structures of the trolley are omitted.

[0116] Figure 39 is a cross-sectional view of the seat fixing mechanism taken along line JJ of Figure 35, where other structures of the trolley are omitted.

[0117] Figure 40 is a partial exploded view of a seat fixing mechanism according to an embodiment of this application.

[0118] Figure 41 is an exploded view of a seat fixing mechanism according to an embodiment of this application.

[0119] Figure 42 is a perspective view of a trolley according to an embodiment of the present application, wherein the locking seat is in the folded position.

[0120] Figure 43 is an enlarged view of part D in Figure 42.

[0121] Figure 44 is a perspective view of a trolley according to an embodiment of the present application, wherein the card holder is in the unfolded position.

[0122] Figure 45 is an enlarged view of part E in Figure 44.

[0123] Figure 46 is a top view of a trolley according to an embodiment of the present application, wherein the locking seat is in the folded position.

[0124] Figure 47 is a top view of a trolley according to an embodiment of the present application, wherein the card holder is in the unfolded position.

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

[0126] Figure 49 is a partial exploded view of a seat fixing mechanism according to an embodiment of this application.

[0127] Figure 50 is a perspective view of a vehicle frame according to an embodiment of this application.

[0128] Figure 51 is a perspective view of a container according to an embodiment of this application. Implementation

[0129] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0130] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0131] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0132] Referring together to Figures 1 to 6, Figure 1 shows a frame 1 according to an embodiment of this application, which includes a base frame 10; a front leg post 11; a rear leg post 12; and a rider 14. The lower end of the front leg post 11 is pivotally connected to the base frame 10; the lower end of the rear leg post 12 is pivotally connected to the base frame 10; the lower end of the rider 14 is pivotally connected to the upper end of the front leg post 11, and the upper end of the rear leg post 12 is pivotally connected to the rider 14. The frame 1 can be switched between an extended state (as shown in Figure 1) and a retracted state (as shown in Figure 6). For ease of description, terms indicating relative position, such as "upper," "lower," "front," and "rear," are used in this application, with reference to the orientation of the frame 1 when it is in the extended state. Specifically, the position further away from the support plane of the frame 1 is called "upper," and the position relatively closer to the support plane of the frame 1 is called "lower." For example, the upper end of the front leg 11 refers to the end of the front leg 11 that is relatively far away from the support plane of the frame 1 when the frame 1 is in the unfolded state, and the lower end of the front leg 11 refers to the end of the front leg 11 that is relatively close to the support plane of the frame 1 when the frame 1 is in the unfolded state. Specifically, the end of the frame 1 that is far away from the user when the trolley is pushed forward by the rider 14 is called "front," and the end of the frame 1 that is relatively close to the user is called "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.

[0133] In the embodiment shown in Figure 1, the chassis 10 includes two first rods 100 and two second rods 103, wherein the first rods 100 extend approximately along the length direction L, and the second rods 103 extend approximately along the width direction W. The two first rods 100 and the two second rods 103 form a generally rectangular structure. Optionally, at least one first reinforcing rod 101 is provided between the two first rods 100 to enhance the overall structural stability of the chassis 10. When the frame 1 is in the deployed state, the first rods 100, the front leg rod 11, the rear leg rod 12, and a portion of the rider 14 of the chassis 10 form a polygonal structure. In this embodiment, the first rods 100, the front leg rod 11, the rear leg rod 12, and a portion of the rider 14 of the chassis 10 form a generally triangular structure (an acute triangle in this embodiment, but an obtuse or right triangle in other embodiments) to ensure the stability of the vehicle body.

[0134] Referring to Figures 2 through 6, when the frame 1 switches from the extended state to the retracted state, the rider 14 and the rear leg bar 12 pivot towards the front of the frame 1, the angle β between the rider 14 and the rear leg bar 12 gradually decreases, and the front leg bar 11 pivots towards the rear of the frame 1. The first link 100, the front leg bar 11, the rear leg bar 12, and the rider 14 no longer maintain a roughly triangular structure. During the retraction process, the rider 14 pivots relative to the front leg bar 11, which in turn causes the front leg bar 11 and the rear leg bar 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 retract towards the base frame 10. Using the interior angles of the aforementioned polygonal structure as the included angles between the first rod 100, the front leg rod 11, the rear leg rod 12, and the rider 14, during the retraction process, the included angle between the rider 14 and the rear leg rod 12 (in this embodiment, this included angle is an acute angle) gradually decreases, the included angle between the front leg rod 11 and the base frame 10 (in this embodiment, this included angle is an acute angle) gradually decreases, and the included angle between the rear leg rod 12 and the base frame 10 (in this embodiment, this included angle is an acute angle) gradually decreases. Thus, the rider 14, the front leg rod 11, and the rear leg rod 12 gradually approach the base frame 10 until, in the height direction H, the rider 14, the front leg rod 11, and the rear leg rod 12 are tightly stacked with the base frame 10. At this point, the frame 1 switches to the retracted state, as shown in Figure 6. Therefore, by pivoting the rider 14 relative to the front leg rod 11, the front leg rod 11 and the rear leg rod 12 pivot relative to the base frame 10 to retract, enabling rapid retraction of the frame. In this embodiment, compared to the unfolded state (as shown in Figure 1), the pivoting directions of the handlebar 14 and rear leg bar 12 are opposite to the pivoting direction of the front leg bar 11. The dimensions of the frame 1 in the folded state (as shown in Figure 6) are significantly reduced in both the height direction H and the length direction L, thus allowing for easy storage and folding, for example, in the trunk of a car. Furthermore, due to the significant reduction in the size of the folded frame 1, the user can more easily lift and move the trolley. Optionally, a folding hook 1002 is provided on the front leg bar 11, and a connecting protrusion 143 is provided on the handlebar 14. When the frame 1 is switched to the folded state, the folding hook 1002 can hook onto the connecting protrusion 143 to keep the frame 1 in the folded state and prevent accidental unfolding.

[0135] Referring also to 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 rider 14 and the upper end of the front leg 11, and the rider 14 and the front leg 11 are pivotally connected via the locking joint 15. Specifically, the locking joint 15 includes: a first connecting seat 151 and a second connecting seat 152 pivotally connected to each other. The upper end of the first connecting seat 151 is connected to the lower end of the rider 14; and the lower end of the second connecting seat 152 is connected to the upper end of the front leg 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 rider 14 and the front leg 11, preventing relative pivoting of the rider 14 and the front leg 11, and keeping the frame 1 stably in the unfolded state. When the first connecting seat 151 and the second connecting seat 152 are unlocked, the rider 14 and the front leg 11 are allowed to pivot relative to each other, allowing the frame 1 to switch from the extended state to the retracted state. It should be noted that, optionally, the first connecting seat 151 and the rider 14 are formed separately and then connected by welding or riveting. Alternatively, the first connecting seat 151 can also be integrated with the rider 14; in such an embodiment, the lower end of the rider 14 is directly connected to the upper end of the front leg 11 during the forming process. Similarly, the second connecting seat 152 can also be formed separately from the front leg 11 or as an integrated structure.

[0136] Referring to FIG8, in one embodiment, the locking joint 15 is provided with a locking member 162. The locking member 162 has a locked position, when the locking member 162 is in the locked position, the locking member 162 locks the first connecting seat 151 and the second connecting seat 152 to prevent relative pivoting of the first connecting seat 151 and the second connecting seat 152.

[0137] Referring again 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). A second locking protrusion 1620 and a second locking groove 1621 are formed at the end of the locking member 162 facing the second connecting seat 152. A first locking groove 1520 and a first locking protrusion 1521 are formed at the end of the second connecting seat 152 facing the first connecting seat 151. When the locking member 162 moves to the locked position, the second locking protrusion 1620 engages in the first locking groove 1520, and the first locking protrusion 1521 engages in the second locking groove 1621. At this time, the side of the first locking protrusion 1521 facing the locking member 162 abuts against the inner wall of the second locking groove 1621, the sidewall of the first locking protrusion 1521 abuts against the sidewall of the second locking protrusion 1620, and the side of the second locking protrusion 1620 facing the second connecting seat 152 abuts against the inner wall of the first locking groove 1520. Thus, through the sliding engagement of the locking member 162 with the first connecting seat 151, the abutting engagement of the second locking protrusion 1620 with the first locking groove 1520, and the abutting engagement of the first locking protrusion 1521 with the second locking groove 1621, 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 prevented. As a result, the rider 14 and the front footrest 11 are locked, the relative pivoting of the rider 14 and the front footrest 11 is prevented, and the frame 1 can be stably kept in the deployed state.

[0138] 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 may be biased to one side of the axial line of the first connecting seat 151, as long as the locking member 162 can slide along the axial direction of the first connecting seat 151 and lock into the second connecting seat 152.

[0139] In this embodiment, the first connecting seat 151 has a first extension and a first recess at one end near the second connecting seat 152, and the second connecting seat 152 has a second extension and a second recess at one end near the first connecting seat 151. When the first connecting seat 151 and the second connecting seat 152 are locked together, the first extension is received in the second recess, and the second extension is received in the first recess. The projections of the first extension and the second extension along the width direction W overlap. In this embodiment, the rider 14 and the front footrest 11 have arcuate outer peripheral surfaces, and the first extension and the second extension also have arcuate outer peripheral surfaces to connect the shapes of the rider 14 and the front footrest 11. A first locking groove 1520 and a first locking protrusion 1521 are provided at the end of the second extension. The locking member 162 is away from the front footrest 11 relative to the first extension.

[0140] Referring also to Figures 3 to 5 and Figure 8, the first connecting seat 151 has a first protrusion 1510 protruding from one side of the first extension, and the second connecting seat 152 has a second protrusion 1522 protruding from one side of the second extension. When the first connecting seat 151 and the second connecting seat 152 are locked together, the first protrusion 1510 and the second protrusion 1522 overlap in the width direction W. The pivot point between the first connecting seat 151 and the second connecting seat 152 is located at the first protrusion 1510 and the second protrusion 1522. In this embodiment, the rider 14 pivots relative to the front footrest 11 towards the front of the frame 1. The first protrusion 1510 and the second protrusion 1522 are located on the upper edge side of the first extension and the second extension, respectively. When the frame is in the retracted state, the rider 14 rotates around this pivot point and retracts to be located above the front footrest 11 (as shown in Figure 6).

[0141] Referring also to Figures 1 and 8, in one embodiment, the frame 1 is further provided with a release mechanism 16. The release mechanism 16 is configured to release the locking of the locking joint 15 against the rider 14 and the front footrest 11, allowing relative pivoting of the rider 14 and the front footrest 11. Optionally, the release mechanism 16 may be provided on the rider 14. The release mechanism 16 includes a release actuation member 160 and a first connector 161. The release actuation member 160 is operably connected to a locking member 162 via the first connector 161. Specifically, one end of the first connector 161 is connected to the release actuation member 160, and the other end of the first connector 161 is connected to the locking member 162. The release actuation member 160 drives the locking member 162 to the release position via the first connector 161. It should be noted that the release mechanism 16 may also have a rivet connected to the release operation member 160 and passing through the rider 14. One end of the first connector 161 can be connected to the rivet to connect with the release operation member 160, and the rider 14 may have an elongated groove for the rivet to slide; or, one end of the first connector 161 can be directly connected to the release operation member 160, and the rider 14 may also have an elongated groove for the first connector 161 to pass through and slide; or, the release operation member 160 has a connecting portion extending into the inner cavity of the rider 14, one end of the first connector 161 can be directly connected to the connecting portion, and the rider 14 may have an elongated groove for the connecting portion to slide. Specifically, the user pushes and pulls the release operation member 160 to drive the locking member 162 to move to the release position, thereby locking the rider 14 and the front footrest 11 with the release locking joint 15, allowing the relative pivoting of the rider 14 and the front footrest 11, and thus allowing the frame 1 to switch from the unfolded state to the folded state. Optionally, as shown in FIG1, the release operation member 160 can be disposed on the rider 14 near the push handle 142 for easy operation by the user. Those skilled in the art should understand that disposing of the release operation member 160 on the rider 14 near the push handle 142 is only one optional embodiment of this application, and the release operation member 160 can also be disposed in other suitable positions according to usage needs, as long as the release operation member 160 can drive the locking member 162 to slide to the release position.

[0142] Referring to Figure 8, in one embodiment, the release operation 160 is a sliding push button, which is sleeved on the rider 14 and can slide along the axial direction (i.e., the length extension direction) of the rider 14. Optionally, the release operation 160 can also be configured in other forms, such as a button, knob, etc., as long as the release operation 160 can drive the locking member 162 to slide to the release position. In one embodiment, the first connecting member 161 is a steel wire, which is disposed in the inner cavity of the rider 14. Optionally, the first connecting member 161 can also be selected from other forms of connecting members, such as a connecting rod, connecting piece, connecting block, etc., as long as the release operation 160 can be operably connected to the locking member 162.

[0143] Referring to 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 cause the locking member 162 to have a tendency to slide to the locked position. Optionally, the first reset member 163 is a spring disposed within the first connecting seat 151, one end of the spring being connected to the first connecting seat 151 (or to the rider 14), and the other end of the spring being connected to the locking member 162. The spring is configured to continuously apply pressure to the locking member 162, causing the locking member 162 to have a tendency to slide to the locked position. Optionally, the first reset member 163 may also be selected from other forms of reset mechanisms, such as a spring, torsion spring, etc., as long as it can cause the locking member 162 to have a tendency to slide to the locked position.

[0144] Referring to Figures 3, 7, and 8, in one embodiment, the rider 14 includes: a push handle 142; an inner rod 140; and an outer rod 141. The upper end of the inner rod 140 is connected to the push handle 142, and the other end of the inner rod 140 is sleeved within the outer rod 141. The inner rod 140 can slide within the outer rod 141 to adjust the length and height of the rider 14. The frame 1 also includes a rider length adjustment mechanism 17, which is operatively 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.

[0145] In the embodiments shown in Figures 7 and 8, the rider 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 slidable between an adjusted position and a fixed position. The second reset member 171 abuts against the adjustment button 170 and is configured to cause the adjustment button 170 to have a tendency to slide to the fixed position. Optionally, the second reset member 171 is a spring disposed within the push handle 142, with one end connected to the push handle 142 and the other end connected to one end of the adjustment button 170. The spring is configured to continuously apply pressure to the adjustment button 170, causing the adjustment button 170 to have a tendency to slide to the fixed position. Optionally, the second reset member 171 may also be selected from other forms of reset mechanisms, such as a spring, a torsion spring, etc., as long as it can cause the adjustment button 170 to have a tendency to slide to the fixed position. An adjustment button 170 is drivably connected to one end of a second connector 172, the other end of which is connected to a drive member 174. When the adjustment button 170 is pressed toward the adjustment position, it pulls the second connector 172 toward the push handle 142 (upward), thereby pulling the drive member 174 via the second connector 172, causing the drive member 174 to slide along the inner rod 140 toward the push handle 142. In one embodiment, the second connector 172 is a steel wire. When the adjustment button 170 is pressed toward the adjustment position, it tensions the steel wire, thereby pulling the drive member 174, causing it to slide along the inner rod 140 toward the push handle 142. Alternatively, the second connector 172 can be other types of connectors, such as a connecting rod, connecting piece, connecting block, etc., as long as the adjustment button 170 can be drivably connected to the drive member 174.

[0146] In one embodiment, the adjusting member 173 is disposed in 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 in 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. The outer rod 141 is provided with multiple locking holes 1410. When the locking member 1731 slides into the locking hole 1410, the inner rod 140 cannot slide in the outer rod 141. Thus, the adjusting member 173 locks the relative position of the inner rod 140 and the outer rod 141, locking the length of the rider 14. When the locking member 1731 slides out of the locking hole 1410, the inner rod 140 is allowed to slide in the outer rod 141. Thus, the adjusting member 173 releases the locking of the relative position of the inner rod 140 and the outer rod 141, allowing the length of the rider 14 to be adjusted. The driving member 174 is provided in the inner rod 140. One end of the driving member 174 is connected to the second connecting member 172, and the other end of the driving member 174 is provided with a driving groove (not shown). The pin 1732 (e.g., rivet) provided in the locking member 1731 passes through the driving groove, connecting the driving member 174 to the locking member 1731. When the user presses the adjustment button 170 to the adjustment position, the second connector 172 (e.g., a steel wire) pulls the drive member 174, causing the drive member 174 to slide along the inner rod 140 toward the push handle 142. The drive groove of the drive member 174 forces the locking member 1731 to slide along the straight groove 1730 toward the direction of exiting the locking hole 1410, thereby allowing the locking member 1731 to slide out of the locking hole 1410, allowing the length of the rider 14 to be adjusted. When the rider 14 is adjusted to the appropriate length, the user releases the pressure on the adjustment button 170. Under the action of the second reset member 171, the adjustment button 170 returns from the adjusted position to the fixed position. At this time, the second connector 172 no longer applies a pulling force to the drive member 174. Under the action of the third reset member 175, the drive member 174 has a tendency to slide along the inner rod 140 in a direction away from the push handle 142. Thus, the drive groove of the drive member 174 causes the locking member 1731 to have a tendency to slide along the straight groove 1730 in a direction towards entering the locking hole 1410. At this time, if the corresponding end of the locking member 1731 is located in the locking hole 1410, the locking member 1731 will slide into the locking hole 1410 to lock the length of the rider 14; if the corresponding end of the locking member 1731 is not located in the locking hole 1410, the length of the rider only needs to be slightly adjusted so that the corresponding end of the locking member 1731 reaches the nearest locking hole 1410, after which the locking member 1731 will automatically slide into the locking hole 1410 to lock the length of the rider 14. It should be noted that the adjusting member 173 can be any structure known to those skilled in the art, and this application does not limit it.

[0147] 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 to cause the driving member 174 to have a tendency to slide away from the push handle 142. Optionally, the third reset member 175 is a spring, one end of which (the end of the third reset member 175 near the push handle 142 in Figure 8) abuts against the adjusting member 173, and the other end of which (the end of the third reset member 175 away from the push handle 142 in Figure 8) abuts against the driving member 174. The spring is configured to continuously apply pressure to the abutting driving member 174, causing the abutting driving member 174 to have a tendency to slide away from the push handle 142. Optionally, the third reset member 175 may also be selected from other forms of reset mechanism, such as a spring, torsion spring, etc., as long as it can cause the driving member 174 to have a tendency to slide away from the push handle 142.

[0148] Referring to Figure 1, in one embodiment, the frame 1 further includes a support frame 13. The support frame 13 is a generally rectangular structure. Optionally, the edges of the support frame 13, for example, edges extending generally along the length direction L, may be recessed toward the interior 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 a locking joint 15. Preferably, the middle portion of the support frame 13 is pivotally connected to the locking joint 15 to help reduce the length (L) dimension of the frame 1 in the folded state. Optionally, the support frame 13 may be provided with accessories such as a tray assembly 130, a sunshade assembly 131, a seat fixing mechanism 132, etc. The tray 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 car seat (not shown), etc. Further, in this embodiment, the frame 1 also includes a linkage rod 18. One end of the linkage 18 is pivotally connected to the support frame 13, and the other end is pivotally connected to the rear foot lever 12. When the frame 1 is in the unfolded state, the pivot point of the linkage 18 on the support frame 13 and the pivot point of the locking joint 15 on the support frame 13 are approximately at the same height in the height direction H, and together they support the support frame 13, making the support frame 13 stable and non-pivotable. When the frame 1 switches from the unfolded state to the retracted state, the linkage 18 pivots towards the rear of the frame 1, and the rear foot lever 12 pivots towards the front of the frame 1, thereby gradually increasing the included angle γ between the linkage 18 and the rear foot lever 12, as shown in Figures 3 to 5. The height of the pivot point of the linkage 18 on the support frame 13 gradually decreases in the height direction H. Simultaneously, the height of the locking joint 15 in the height direction H also gradually decreases, and the height of the pivot point of the locking joint 15 on the support frame 13 in the height direction H also gradually decreases. During this process, the rate of decrease in height of the pivot point of the locking joint 15 on the support frame 13 in the height direction H is greater than the rate of decrease in height of the pivot point of the linkage 18 on the support frame 13 in the height direction H. As a result, the support frame 13 will exhibit a tilted posture with the front lower than the rear, as shown in Figures 3 to 5. Finally, in the height direction H, the support frame 13, rider 14, front footrest 11, rear footrest 12, and base frame 10 are tightly stacked together, thus switching the frame 1 to the retracted state, as shown in Figure 6. In this embodiment, the pivot point of the rear footrest 12 and the rider 14 is located on the side of the rider 14 facing the inside of the frame 1. The projection of the pivot trajectory of the rear footrest 12 along the height direction H does not overlap with the projection of the pivot trajectory of the front footrest 11 or the rider 14 along the height direction H. Thus, in the retracted state, the rear footrest 12 and the front footrest 11 are offset from each other in the width direction W.

[0149] Referring also to Figures 1 and 6, in one embodiment, the edge of the support frame 13 extending generally along the length direction L is recessed toward the interior of the support frame 13. The distance between the two edges of the base frame 10 extending generally along the length direction L gradually decreases from the front end to the rear end of the frame 1. In the unfolded state of the frame 1, the projection of the support frame 13 in the height direction H falls within the projection of the base frame 10 in the height direction H; that is, the distance between the two edges of the support frame 13 extending generally along the length direction L is not greater than the distance between the two edges of the base frame 10 extending generally along the length direction L. The projection of the rear leg bar 12 along its length L is approximately "S" shaped. Specifically, the upper portion of the rear leg bar 12 has an outwardly projecting portion 122 protruding outward from the frame 1. The outwardly projecting portion 122 is used to avoid the support member 13, allowing the upper end of the rear leg bar 12 to be pivotally connected to the rider 14. The lower portion of the rear leg bar 12 has an inwardly recessed portion 123 recessed inward from the frame 1. The inwardly recessed portion 123 is used to provide a pivoting connection point for the linkage 18. When the frame 1 switches between the extended and retracted states, the recess on the edge of the support frame 13 extending approximately along the length L and the outwardly projecting portion 122 of the rear leg bar 12 provide pivoting space for the rear leg bar 12, preventing interference between the support frame 13 and the rear leg bar 12.

[0150] In the embodiments shown in Figures 1 to 6, the frame 1 further includes a front footrest 110 and a rear footrest 120. The front footrest 110 is connected to the base frame 10, and the front leg 11 is pivotally connected to the front footrest 110. The rear footrest 120 is connected to the base frame 10, and the rear leg 12 is pivotally connected to the rear footrest 120. In one embodiment, the frame 1 is also provided with a pull rod 19, which allows the user to pull the trolley. Optionally, the pull rod 19 is located at the front of the base frame 10. Preferably, the pull rod 19 is pivotally located at the middle of the second rod 103. Referring to Figures 1 and 3, in one embodiment, the pull rod 19 can slide along a slide rail 196 located at the bottom of the base frame 10 to a storage position at the bottom of the base frame 10. As shown in Figure 2, the base frame 10 is inclined from front to back and from top to bottom, and the slide rail 196 is also inclined to guide the pull rod 19 to the storage position and facilitate the user to pull out the pull rod 19.

[0151] Figure 9 shows a perspective view of the frame 1 in an unfolded state according to an embodiment of this application. Figures 10 to 13 show the process of switching the frame 1 shown in Figure 9 from the unfolded state to the folded state. The frame 1 in the embodiment shown in Figure 9 is structurally similar to the frame 1 in the embodiment shown in Figure 1; the following description focuses only on the differences between the two.

[0152] Referring to Figure 9, in this embodiment, a first curved portion 1001 protruding inward toward the frame 1 is formed on the first rod 100 to form a first clearance space 10010. When the frame 1 is in the retracted state, at least a portion of the front leg 11 is located within the first clearance space 10010. Optionally, the position of the first curved portion 1001 on the first rod 100 is configured such that when the frame 1 is in the retracted state, at least half of the axial extension length of the front leg 11 can be located within the first clearance space 10010 (as shown in Figure 13), so that the structure of the retracted frame 1 is more compact, further reducing the dimensions of the retracted frame 1 in the length direction L and height direction H.

[0153] Referring to Figures 9 and 13, in this embodiment, a second curved portion 121 protruding towards the rear of the frame 1 is formed on the rear footrest 12 to form a second clearance space 1210. When the frame 1 is in the retracted state, at least a portion of the rider 14 is located within the second clearance space 1210. Optionally, the second curved portion 121 is configured such that during the process of switching the frame 1 to the retracted state, the locking joint 15 can be accommodated in the second clearance space 1210, thereby the rear footrest 12 does not restrict the pivoting of the rider 14 relative to the front footrest 11; when the frame 1 is fully retracted, at least half of the axial extension length of the rider 14 can be located within the second clearance space 1210 (as shown in Figure 13), and a portion of the rear footrest 12 rests against the top of the rider 14, thereby making the structure of the retracted frame 1 more compact and further reducing the dimensions of the retracted frame 1 in the length direction L and height direction H.

[0154] Referring to Figures 9 and 13 together, in this embodiment, one end of the linkage 18 is pivotally connected to the support frame 13, and the other end of the linkage 18 protrudes outward toward the frame 1 in the width direction W to be pivotally connected to the front footrest 11. The pivot point of the rear footrest 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 footrest 12 along the height direction H at least partially overlaps with the projection of the pivot trajectory of the front footrest 11 and / or the rider 14 along the height direction H.

[0155] Referring to Figures 10 to 13, when the frame 1 switches from the extended state to the retracted state, the rider 14 and rear leg bar 12 pivot towards the front of the frame 1, and the front leg bar 11 pivots towards the rear of the frame 1. The first bar 100, front leg bar 11, rear leg bar 12, and rider 14 no longer maintain a roughly triangular structure. During the retraction process, the rider 14, front leg bar 11, and rear leg bar 12 gradually approach the chassis 10 until, in the height direction H, the rider 14, front leg bar 11, and rear leg bar 12 are tightly stacked with the chassis 10. At this time, at least a portion of the front leg bar 11 is located within the first clearance space 10010, and at least a portion of the rider 14 is located within the second clearance space 1210. Thus, the frame 1 switches to the retracted state, as shown in Figure 13. Compared to its unfolded state, the dimensions of the frame 1 in the folded state are significantly reduced in both the height direction (H) and length direction (L), thus allowing for easy storage and folding, for example, in the trunk of a car. Furthermore, the significant reduction in the size of the frame 1 makes it easier for the user to lift and carry the trolley. Further, in this embodiment, the pivot position between the support frame 13 and the locking joint 15, or more precisely, the pivot position between the support frame 13 and the handlebar 14, is offset from the center of the support frame 13 by a certain distance. Specifically, the pivot position between the support frame 13 and the handlebar 14 is offset towards the side of the support frame 13 away from the linkage 18. Linkage rod 18 is positioned between support frame 13 and front foot bar 11. When frame 1 is in the extended state, the pivot point of linkage rod 18 on support frame 13 and the pivot point of locking joint 15 on support frame 13 (or the pivot point of rider 14 on support frame 13) are approximately at the same height in the height direction H, and together they support support frame 13, making support frame 13 stable and non-pivotable. When frame 1 switches from the extended state to the retracted state, linkage rod 18 pivots towards the front of frame 1, and the height of the pivot point of linkage rod 18 on support frame 13 gradually decreases in the height direction H. Simultaneously, as rider 14 pivots towards the front of frame 1, the height of the pivot point of locking joint 15 on support frame 13 (or the pivot point of rider 14 on support frame 13) also gradually decreases in the height direction H. During this process, the descent speed of the pivot point of the linkage 18 on the support frame 13 in the height direction H is approximately the same as the descent speed of 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) in the height direction H. Therefore, during the retraction process, the support frame 13 hardly pivots relative to a plane parallel to the length direction L and the width direction W, and the support frame 13 remains approximately horizontal, as shown in Figures 10 to 12. Finally, in the height direction H, the support frame 13, rider 14, front foot bar 11, rear foot bar 12, and base frame 10 are tightly stacked together. This embodiment design brings at least the following beneficial effects:

[0156] This prevents accidental pinching or impact to any part of the user's body, such as hands or knees, caused by the pivoting of the support frame 13.

[0157] When the support frame 13 is fitted with a cloth cover, the support frame 13 and the cloth cover descend and retract together in a roughly horizontal posture. Compared with the embodiment shown in Figure 1, the material at different positions of the cloth cover can be compressed and folded more evenly, thus resulting in a flatter surface after retraction.

[0158] Referring again to Figure 9, in this embodiment, a second reinforcing rod 102 is provided between the two first rods 100. This second reinforcing rod 102 enhances the overall structural stability of the base frame 10. Specifically, the second reinforcing rod 102 increases the structural stability at the first bend 1001. Optionally, both ends of the second reinforcing rod 102 are connected to the first bends 1001 of the two first rods 100. Optionally, the second reinforcing rod 102 is configured as an arc-shaped structure.

[0159] Referring to Figures 9 and 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 between an adjusted position and a fixed position along the axial direction of the inner rod 140. When the user pushes or pulls the adjustment button 170, causing the adjustment button 170 to slide from the fixed position to the adjusted position, the adjustment button 170 drives the adjustment member 173 to slide to the adjusted state through the second connector 172, so as to allow the inner rod 140 and the outer rod 141 to slide relative to each other, thereby allowing the length and height of the rider 14 to be adjusted.

[0160] According to one embodiment of this application, a trolley is also provided, which includes a frame 1 according to an embodiment of this application and a cloth cover (not shown) fitted onto a support frame 13. The support frame 13 and the cloth cover together form the storage space of the trolley.

[0161] The following describes the folding process of the vehicle frame 1 according to an embodiment of this application, using the embodiment shown in Figure 1 as an example. As shown in Figures 1 and 2, the vehicle frame 1 is in the unfolded state. When folding, firstly, the mechanisms such as a bassinet or child safety seat connected to the seat fixing mechanism 132 are removed, and the seat fixing mechanism 132 is adjusted to the folded position shown in Figure 1; the lever 19 is pivoted and slid to the folded position; and the sunshade assembly 131 is adjusted to the folded position, as shown in Figure 3. Then, the user pushes or pulls the release operation member 160, such as a release button, and pushes the rider 14 to pivot towards the front of the vehicle frame 1, causing the rider 14 to pivot the rear footrest 12 towards the front of the vehicle frame 1, and the front footrest 11 to pivot towards the rear of the vehicle frame 1. Once rider 14 has passed the vertical position (i.e., the position where the axial extension of rider 14 is parallel to the height direction H), the user no longer needs to push rider 14. Rider 14, front leg bar 11, and rear leg bar 12 will gradually approach the base frame 10 under the influence of gravity until, in the height direction H, rider 14, front leg bar 11, and rear leg bar 12 are tightly stacked with the base frame 10, and the frame 1 switches to the folded state, as shown in Figures 5 and 6. Finally, the user hooks the folding hook 1002 onto the connecting protrusion 143 to keep the frame 1 in the folded state and prevent accidental unfolding.

[0162] Referring to Figures 15 to 17, one embodiment of this application provides a trolley including a base frame 10 and a pull rod mechanism 2 connected to the base frame 10. The pull rod mechanism 2 includes a pull rod 19; a rotating portion 192; and a third connecting seat 194. One end of the pull rod 19 is connected to the rotating portion 192, and the rotating portion 192 is connected to the third connecting seat 194, and is pivotable between a first pivot position and a second pivot position. With reference to the base frame 10 or the rotating portion 192, when the pull rod 19 is in the first pivot position, the pull rod 19 is at a first angle; 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 relative to the base frame 10 (or the third connecting seat 194) between the first angle and the second angle. Specifically, when the rotating part 192 pivots to the first pivot position, the pull rod 19 pivots to the upright position (as shown in Figure 15); when the rotating part 192 pivots to the second pivot position, the pull rod 19 pivots to the reclining position (as shown in Figure 17). When the user pulls the cart using the pull rod 19, the pull rod 19 and the rotating part 192 will pivot to a position that matches the user's height and arm length, for example, the position of the pull rod 19 in Figure 16, which facilitates the user's operation.

[0163] As shown in Figure 18, in one embodiment, the lever 19 includes a handle 190 and a connecting rod 191. The handle 190 is configured with a generally annular structure for easy gripping by the user. It should be noted that the generally annular structure is only one optional implementation of the handle structure. Those skilled in the art can choose other handle structures according to usage requirements, such as polygonal, straight, "T"-shaped, cross-shaped, etc., as long as they can meet the user's gripping needs. This application does not limit this. In the embodiment shown in Figure 18, 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 configured with a generally "C" shape, and the mounting portion 1902 is configured with a generally "T" shape, wherein the two ends of the "C"-shaped grip 1901 are respectively connected to the two ends of the "T"-shaped mounting portion 1902, and the other end of the "T"-shaped mounting portion 1902 is connected to one end of the connecting rod 191. Optionally, the mounting part 1902 and the handle 1901 are integrally formed. Optionally, the handle 1901 is made of a non-slip material such as rubber or plastic. Preferably, the surface of the handle 1901 is provided with a non-slip structure, such as non-slip textures or non-slip protrusions. The other end of the connecting rod 191 is connected to the rotating part 192. Optionally, the mounting part 1902, the handle 1901, and the connecting rod 191 are integrally formed.

[0164] Referring to Figures 19, 20, and 23, in one embodiment, the rotating part 192 includes a main body 1921 and a connecting end 1922. The main body 1921 is configured as a generally cylindrical structure and can pivot about the axial direction of the cylinder. It should be noted that the generally cylindrical structure is only one optional embodiment of this application. Those skilled in the art can choose other suitable shapes for the main body of the rotating part according to actual needs, such as cubes, polyhedra, etc., and this application does not limit this. The connecting end 1922 is configured as a boss protruding from the cylindrical curved surface of the main body 1921. The boss is provided with a first connecting hole 19220, and the other end of the connecting rod 191 is inserted into the first connecting hole 19220. The interior of the main body 1921 is provided with a receiving cavity 19221 communicating with the first connecting hole 19220, and each of the two end faces of the main body 1921 is provided with a second pivot hole 1924, which communicates with the receiving cavity 19221. The other end of the connecting rod 191 passes through the first connecting hole 19220 and is received in the receiving cavity 19221, and the other end of the connecting rod 191 is provided with a first pivot hole 1910 through the connecting rod 191.

[0165] Referring to Figures 19 to 21 and 23, in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivot space 1944. The pivot space 1944 is configured to be approximately cylindrical, matching the shape of the main body 1921 of the rotating part 192. The main body 1921 of the rotating part 192 is pivotally disposed within the pivot space 1944. It should be noted that the approximately cylindrical structure is only one optional embodiment of this application. Those skilled in the art can choose other suitable shapes for the pivot space of the connecting seat according to actual needs, such as cubes, polyhedra, etc., as long as the main body 1921 of the rotating part 192 can be pivoted within the pivot space 1944. This application does not impose any restrictions on this. The side wall of the pivot space 1944 is provided with a fourth pivot hole 1943 communicating with the pivot space 1944.

[0166] Referring to Figures 19 and 20, in one embodiment, a first positioning member 193 is provided between the third connecting seat 194 and the rotating part 192. The first positioning member 193 allows the pull rod 19 to be positioned relative to the third connecting seat 194 at multiple different pivot angles. It is understood that the first positioning member 193 limits the pull rod 19, allowing it to have multiple different positioning angles relative to the third connecting seat 194. The first positioning member 193 is configured to restrict the pivoting of the rotating part 192. Specifically, the first positioning member 193 is located between the inner surface of the sidewall of the pivoting space 1944 of the third connecting seat 194 and the end face of the main body 1921 of the rotating part 192. Optionally, the first positioning element 193 is a damping plate 1931. The thickness of the damping plate 1931 is slightly larger 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 plate 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 part 192 has a tendency to pivot relative to the third connecting seat 194, there are static friction forces between the damping plate 1931 and the side wall of the pivot space 1944, and between the damping plate 1931 and the end face of the main body 1921. The resultant force of these static friction forces prevents the rotating part 192 from pivoting relative to the third connecting seat 194. In this embodiment, the clamping force (pressure) between the inner surface of the sidewall of the pivot space 1944 and the end face of the main body 1921 on the damping plate 1931 is set such that the torque resulting from the resultant force of the static friction force exerted by the damping plate 1931 on the sidewall of the pivot space 1944 and the end face of the main body 1921 by the clamping force (pressure) is not less than the torque resulting from the weight of the pull rod 19 and the rotating part 192. Therefore, when the user does not apply any external force to the pull rod mechanism 2, the pull rod 19 and the rotating part 192 can remain in their original positions without pivoting. This design allows the pull rod 19 to be held in any usage position (e.g., the position of the pull rod 19 in FIG. 16). Thus, when the user releases their grip on the pull rod 19, the pull rod 19 will not suddenly pivot or fall towards the support surface under its own weight, improving the safety of the trolley and making it easier for the user to grip the pull rod 19 again. Furthermore, when the user applies a pulling or pushing force to the lever 19, if the total torque that causes the lever 19 and the rotating part 192 to pivot is greater than the torque generated by the clamping force (pressure) resulting from the resultant force of the static friction between the damping plate 1931 and the end face of the pivot space 1944 and the main body 1921, the lever 19 and the rotating part 192 will pivot.This design allows for the adjustment and positioning of the pull rod 19, enabling users to adjust it to any position between the first and second pivot positions, thus achieving stepless adjustment of the pull rod 19's angle and broadening its applicability.

[0167] In one embodiment, the damping sheet 1931 is optionally a flexible component. Optionally, the material of the damping sheet 1931 includes at least one of the following: a soft gel; a rubber material; and a plastic material. Optionally, the material of the damping sheet 1931 may include HYTREL material.

[0168] Referring to Figures 20 and 23, in one embodiment, a damping plate 1931 is provided between each of the two end faces of the main body 1921 and the side wall of the pivot space 1944. The damping plate 1931 has a third pivot hole 19310. When the connecting rod 191, the rotating part 192, the damping plate 1931, and the third connecting seat 194 are assembled together, the pivot pin 195 passes sequentially through the fourth pivot hole 1943, the third pivot hole 19310, the second pivot hole 1924, and the first pivot hole 1910. This achieves a pivotally connected connection between the connecting rod 191 and the rotating part 192, and positions the damping plate 1931 (preventing the damping plate 1931 from sliding out of the gap between the inner surface of the side wall of the pivot 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 wobbling within the first connecting hole 19220.

[0169] Referring to Figure 23, in one embodiment, a limiting protrusion 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 protrusion 1923 slides within 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 upright position to the lying position, the limiting protrusion 1923 abuts against the side wall of the limiting groove 19440 to restrict the rotating part 192 from continuing to pivot. By setting the limiting protrusion 1923 and the limiting groove 19440, the rotation range of the pull rod 19 can be limited, ensuring that the pull rod 19 still maintains a certain distance from the support surface of the trolley (e.g., the ground) when in the reclining position. This prevents the pull rod 19 from contacting the support surface of the trolley (e.g., the ground) due to "excessive reclining," which could cause the handle 190 to become dirty or worn. It also makes it easier for the user to grip the pull rod 19 in the reclining position, enhancing its convenience and practicality. It should be noted that although in this embodiment the limiting protrusion 1923 is located on the main body 1921 of the rotating part 192, and the limiting groove 19440 is located in the inner wall of the pivot space 1944 of the third connecting seat 194, this is only an optional embodiment. Those skilled in the art can adjust the positions of the limiting protrusion and the limiting groove according to actual needs, as long as the pivoting of the rotating part is limited to prevent "excessive reclining." For example, the limiting protrusion can be located on the inner wall of the pivot space of the third connecting seat, and the limiting groove can be located in the main body of the rotating part.

[0170] Referring to Figures 21 and 22, in one embodiment, a first through hole 1941 is provided at the end of the third connecting seat 194 opposite to the pivot space 1944, and the first through hole 1941 is slidably fitted onto 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 shown in Figure 21; when the third connecting seat 194 slides to the second sliding position, the pull rod 19 slides to the retracted position, as shown in Figure 22. 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 retracted position, avoiding the pull rod 19 from affecting the user's work and facilitating the folding up of the trolley.

[0171] Referring to Figures 21 and 23, in one embodiment, a second through hole 1942 is provided on the sidewall of the first through hole 1941. A second positioning hole 1961 is provided on the portion of the slide rail 196 corresponding to the first sliding position of the third connecting seat 194. A second positioning member 1960 is provided within the slide rail 196, at least a portion of which 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 undesirable sliding of the third connecting seat 194 toward the second sliding position and maintaining the pull rod 19 in the extended position. Optionally, the second positioning member 1960 is a spring sheet having a first protrusion 19601, which is slidable within the second positioning hole 1961.

[0172] Referring to Figures 22 and 24, in one embodiment, a third positioning hole 1963 is provided on the portion of the slide rail 196 corresponding to the second sliding position of the third connecting seat 194. A third positioning member 1962 is provided within the slide rail 196, and 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. This prevents the third connecting seat 194 from undesirably sliding toward the first sliding position, which helps to maintain the pull rod 19 in the retracted position. For example, when the pull rod 19 is in the retracted position, even if the trolley is supported on an inclined surface or an external force suddenly impacts the rear of the trolley, 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 element 1962 is a spring sheet having a second protrusion 19621 that is slidable within the third positioning hole 1963.

[0173] Referring to Figures 20, 21, and 22, in one embodiment, the lever mechanism 2 further includes a fixing part 198, and a slide rail 196 is connected to the fixing part 198. When the rotating part 192 pivots from the second pivot position to the first pivot position, the lever 19 abuts against the front surface of the fixing part 198 to limit the rotating part 192 from further pivoting. In this embodiment, the lever mechanism 2 includes a front lever 1031 and a rear lever 1032, which are connected to the base frame 10. Optionally, as shown in Figure 20, the base frame 10 includes two first levers 100 extending along the length direction L of the trolley and two second levers 103 extending along the width direction W of the trolley, with the front lever 1031 and the rear lever 1032 being the two second levers 103 of the base frame 10. The front lever 1031 and the rear lever 1032 are each fixed to a fixing part 198, and the two ends of the slide rail 196 are respectively connected to the two fixing parts 198. When the rotating part 192 pivots from the second pivot position to the first pivot position, the pull rod 19 abuts against the front surface of the fixing part 198 of the front rod 1031 to limit the rotating part 192 from continuing to pivot. For ease of description, this application uses terms indicating relative position, such as "up," "down," "front," and "rear," which are referenced to the direction shown in FIG15. Specifically, in FIG15, "up" is relative to above, "down" is relative to below, "front" is relative to the left, and "rear" is relative to the right.

[0174] Referring to Figures 19 and 22, in one embodiment, the lever mechanism 2 further includes at least one storage member 197, which is disposed on the front rod 1031 and has a storage groove 1970. When the lever 19 slides to the storage position, at least a portion of the lever 19 is stored in the storage groove 1970. In this embodiment, the storage member 197 is hook-shaped, but this is only exemplary. In other embodiments, the storage member 197 can also be set to other suitable shapes, and this application does not limit this. Optionally, when the lever 19 slides to the storage position, the handle 190 of the lever 19 is stored in the storage groove 1970. Optionally, the lever mechanism 2 includes two storage members 197, which are spaced apart by a fixing portion 198 disposed on the front rod 1031, and the openings of the storage grooves 1970 of the two storage members 197 are arranged opposite to each other. When the lever 19 slides to the storage position, at least a portion of the lever 19, such as the handle 190, is stored in the two storage slots 1970.

[0175] Referring again to Figure 17, in one embodiment, there is a certain angle α between the extension 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 reclining state, the extension direction of the pull rod 19 is approximately parallel to the extension direction D2 of the slide rail 196. With this design, on the one hand, when the pull rod 19 is in the reclining state, there is a certain distance between the handle 190 and the supporting surface, making it convenient for the user to grip the handle 190 again; on the other hand, the angle α makes the pulling out and pushing in of the pull rod 19 more ergonomic, making the operation of pulling out and pushing in the pull rod 19 more comfortable for the user.

[0176] The working principle of the lever mechanism 2 according to the embodiments of this application is explained below using the embodiments shown in Figures 15 to 24 as examples.

[0177] As shown in Figure 22, the pull rod 19 is in the stowed position, stored below the base frame 10 of the trolley. At this time, the second protrusion 19621 passes through the third positioning hole 1963 and enters the second through hole 1942. Referring to Figure 24, the third connecting seat 194 is held in the second sliding position, that is, the pull rod 19 is held in the stowed position. Without external force pulling the pull rod 19 out, it will not disengage from the stowed position. In this state, the pull rod 19 has very little impact on the overall volume of the trolley and does not affect the folding and closing operation of the trolley.

[0178] When the user needs to pull the trolley using the lever 19, the user holds the handle 190 of the lever 19 and applies a pulling force towards the front of the trolley. When the pulling force is sufficient to overcome the elasticity of the spring, the second protrusion 19621 disengages from the second through hole 1942, thereby releasing the retention of the third connecting seat 194. Continuing to apply the pulling force, the lever 19 is pulled from the retracted position to the extended position, as shown in Figure 17. Because there is an angle α between the slide rail 196 and the supporting surface, the above-described pull-out operation conforms to ergonomic standards and is therefore relatively comfortable for the user.

[0179] When the pull rod 19 reaches the extended position, the first protrusion 19601 passes through the second positioning hole 1961 and enters the second through hole 1942 (refer to FIG. 23), holding the third connecting seat 194 in the first sliding position, that is, holding the pull rod 19 in the extended position. Without external force, the pull rod 19 will not disengage from the extended position. At this time, the user continues to apply pulling force to the pull rod 19 to pull the trolley. During this process, based on the user's height and arm length, the rotating part 192 and the pull rod 19 will pivot to a position suitable for the user's use (e.g., the position of the pull rod 19 in FIG. 16).

[0180] If the user stops pulling and releases their grip on the lever 19 while pulling the cart, the lever 19 will remain in the position it was in when the user released it, thanks to the action of the first positioning element 193 (e.g., damping plate 1931). The lever 19 will not pivot towards the support surface due to its own weight. The user can then grip the lever 19 again from the position it was in when it was released to continue pulling the cart.

[0181] If it is necessary to pivot the lever 19 to the upright position (as shown in Figure 15), simply apply a pushing force to the lever 19 to pivot it to the upright position. At this time, the lever 19 cannot continue to pivot because it is against the front surface of the fixing part 198 of the front lever 1031. This not only avoids the lever 19 pivoting too far toward the stroller and interfering with other parts of the stroller, but also prevents the lever 19 from crushing the items stored in the stroller, and further prevents the lever 19 from accidentally injuring the child in the bassinet installed on the stroller.

[0182] After use, the user can pivot the lever 19 to the reclining position and push it towards the rear of the trolley. When the applied force is sufficient to overcome the spring force of the spring clip, the first protrusion 19601 exits the second through hole 1942, thereby releasing the retention of the third connecting seat 194. Continuing to apply force pushes the lever 19 from the extended position to the retracted position, as shown in Figure 22. At this time, the second protrusion 19621 passes through the third positioning hole 1963 and enters the second through hole 1942 (refer to Figure 24), holding the third connecting seat 194 in the second sliding position, that is, holding the lever 19 in the retracted position. Without external force, the lever 19 will not disengage from the retracted position. As the lever 19 enters the retracted position, the handle 190 enters the storage slot 1970.

[0183] Figures 25 to 29 show other embodiments according to this application, which are structurally similar to the lever mechanism 2 in the foregoing embodiments. The following description focuses only on the differences between the two.

[0184] Referring to Figures 25 and 26, in one embodiment, the lever mechanism 2 includes a storage member 197 disposed below the fixing portion 198 fixed to the front lever 1031. The opening of the storage groove 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 lever 19 slides to the storage position, at least a portion of the lever 19, such as the handle 190, enters and is stored in the storage groove 1970. In this embodiment, the opening of the storage groove 1970 faces forward, making it easier for the user to remove and place the handle 190 into the storage groove 1970. In this embodiment, a portion of the handle 190 is received in the storage groove 1970, allowing the user to grasp the front end of the handle 190 and pull the lever 190 to the extended position.

[0185] Referring to Figures 28 and 29, in one embodiment, one end of the third connecting seat 194 is recessed inward to form a pivot space 1944, in which at least a portion of the rotating part 192 is received. The inner surface of at least one sidewall of the pivot space faces at least one surface of the rotating part. One of the opposing surfaces of the rotating part 192 and the sidewall of the pivot space is provided with at least one resilient finger 199. The other of the opposing surfaces of the rotating part 192 and the sidewall of the pivot space is provided with a plurality of positioning recesses 1932. A positioning protrusion 1945 is provided on the side of the resilient finger 199 facing the positioning recess 1932, and the positioning protrusion 1945 can engage with one of the positioning recesses 1932 to position the pull rod at one of a plurality of pivot angles.

[0186] Referring again to Figures 28 and 29, in one embodiment, the first positioning member 193 includes a positioning recess 1932 and a positioning protrusion 1945 that fit together in shape. To clearly illustrate the structure of the positioning recess 1932 and the positioning protrusion 1945, a portion of the inner wall structure of the pivoting space 1944 is removed in Figure 29. In the embodiment shown in Figure 29, at least one positioning recess 1932 is disposed in the end face of the body 1921 of the rotating part 192, and at least one positioning protrusion 1945 is disposed on the inner wall (inner surface of the side wall of the pivoting space) of the pivoting space 1944. As the rotating part 192 pivots, when the positioning protrusion 1945 enters the positioning recess 1932, the positioning protrusion 1945 is confined within the positioning recess 1932 by their shape fit, thereby limiting further pivoting of the rotating part 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 part 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, each of the two positioning protrusions 1945 cooperating 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 shown in FIG29. In other embodiments, the number of positioning protrusions 1945 on each inner wall of the pivot space 1944 is not limited to two; for example, the number of positioning protrusions 1945 on each inner wall of the pivot space 1944 may be one, three, or four, etc. Furthermore, the number of positioning recesses 1932 included in each group of positioning recesses 1932 is not limited to four; it can be any number of two or more, and can be set according to the required adjustment position, such as three or five, etc.

[0187] For the embodiments shown in Figures 25 to 29, the working principle is basically the same as the aforementioned embodiments. The difference lies in that, during the pulling of the trolley, if the user stops pulling and releases their grip on the pull rod 19, and 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 in the position where the pull rod 19 was at the moment the user released it. 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 due to its own weight until the positioning protrusion 1945 enters and engages in the positioning recess 1932, and the pull rod 19 will remain in the position where the positioning protrusion 1945 entered and engaged in the positioning recess 1932. In this embodiment, the pull rod 19 can still remain in the use position or near the use position, avoiding the risk of the pull rod 19 pivoting to the support surface due to its own weight and injuring the user.

[0188] Referring to Figures 30 to 33, an embodiment of this application provides a seat fixing mechanism 132, including a fixing seat 133 and a locking seat 134. The locking seat 134 is slidably connected to the fixing seat 133 and is movable, for example, sliding, between a folded position and an unfolded position. The locking seat 134 is further away from the fixing seat 133 when in the unfolded position than when in the folded position. In this embodiment, the locking seat 134 is also configured to pivot relative to the fixing seat 133, and the locking seat 134 deflects at an angle relative to the fixing seat 133 when moving between the unfolded and folded positions. Of course, the pivotability of the locking seat 134 relative to the fixing seat 133 is only one optional implementation of this application. In other embodiments, the locking seat 134 may also be configured not to pivot relative to the fixing seat 133, and the locking seat 134 only performs translational movement between the unfolded and folded positions.

[0189] Specifically, in this embodiment, the trolley includes a support frame 13, and a seat fixing mechanism 132 is connected to each of the two side rods (i.e., rods extending approximately along the length direction L) of the support frame 13, as shown in Figure 30. For ease of description, only one seat fixing mechanism 132 will be described in the following description. Those skilled in the art should understand that the seat fixing mechanisms 132 on the two side rods have the same structure and pivot simultaneously between the folded and unfolded positions. It should be noted that in actual use, the locking seats 134 of the seat fixing mechanisms 132 on the two side rods pivot simultaneously between the folded and unfolded positions. This is intended to facilitate the folding and unfolding operation of the trolley and to connect the seat 135, as shown in Figures 36 and 37. This is required in actual use scenarios, but it does not mean that the two locking seats 134 cannot pivot independently.

[0190] Referring again to Figures 30 to 33, in one embodiment, the latching seat 134 includes an engagement portion 1346 and a base portion 1349. The engagement portion 1346 is configured to insert into an engagement groove (not shown) in the seat 135, and the base portion 1349 is connected to the engagement portion 1346 and pivotally connected to the fixing seat 133. Optionally, the engagement portion 1346 and the base portion 1349 are integrally formed. Optionally, referring to Figure 33, there is an arc-shaped transition area between the engagement portion 1346 and the base portion 1349, and the width of the engagement portion 1346 is smaller than the width of the base portion 1349 to adapt to the shape of the sidewall of the seat 135. It should be noted that the width direction of the engagement portion 1346 is also defined by the width direction W of the trolley in Figure 30 (the left-right direction on the paper of Figure 33).

[0191] Referring to Figures 32 to 35, in one embodiment, when the locking seats 134 are in the retracted position, the distance between the joint portions 1346 of the two locking seats 134 is L1, and the distance between the base portions 1349 of the two locking seats 134 is L2, as shown in Figure 34. Optionally, L1 can range from 323.46 mm to 395.34 mm, for example, L1 is approximately 359.4 mm; L2 can range from 293.4 mm to 358.6 mm, for example, L2 is approximately 326 mm. Those skilled in the art will 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 and L2. When the locking seats 134 are in the extended position, the distance between the joint portions 1346 of the two locking seats 134 is L1', and the distance between the base portions 1349 of the two locking seats 134 is L2', as shown in Figure 35. Optionally, L1' can range from 301.86mm ≤ L1' ≤ 368.94mm, with L1' being approximately 335.4mm for example; and L2' being approximately 302mm for example. Those skilled in the art will understand that in practical use, the appropriate size of L1' can be selected based on the distance between the two engagement slots of the seat 135 to be secured. Pivoting from the unfolded position to the folded position increases the distance between the two engagement seats 134 by ΔL (i.e., L1-L1') or ΔL (i.e., L2-L2'), for example, ΔL is approximately 24mm, see Figures 32 and 33 for comparison. The two latching seats 134 in the folded position have a larger gap, so the seat fixing mechanism 132 encroaches less on the space between the two side bars of the support frame 13. This helps to reduce the interference of the latching seats 134 with other parts of the stroller when the stroller is folded. On the other hand, the seat 135 can be used without the need for the seat 135. The increased gap between the two latching seats 134 in the folded position helps to reduce the interference of the latching seats 134 with the user's work. For example, it reduces the interference and obstruction of the latching seats 134 with the activities of children sitting in the compartment formed by the support frame 13 and the cloth cover, or it reduces the interference and obstruction of the latching seats 134 with the user's loading and unloading of items.

[0192] Figures 36 and 37 show a stroller with seat 135 fixed to it. Optionally, seat 135 can be a bassinet suitable for younger infants or a seat that can be attached to a baby stroller. Optionally, seat 135 can be replaced with other accessories such as a carrying basket. When installing seat 135, any accessories already installed on the stroller that may interfere with seat 135 should be removed first, such as tray assembly 130, etc.

[0193] Referring to Figures 38 to 41, in one embodiment, the upper end of the joint 1346 is provided with a first locking hole 1347 and / or the lower end of the base 1349 is provided with a second locking hole 1348. The first locking 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 trolley and prevent it from shaking. Of course, in other embodiments, the upper end of the joint 1346 may not be provided with the first locking hole 1347, and the engagement groove of the seat 135 may not be provided with the rod. The second locking hole 1348 is used to engage with the engaging protrusion of the seat 135 to make the fixation of the seat 135 more secure.

[0194] Referring again to Figures 38 to 41, in one embodiment, the fixing seat 133 is provided with a connecting end 1333, and the engaging seat 134 is provided with a third connecting groove 1342. The connecting end 1333 is inserted into the third connecting groove 1342 to pivotally connect the fixing seat 133 and the engaging seat 134. The end of the connecting end 1333 facing the engaging seat 134 has two opposing first protrusions 13331 and two opposing first recesses 13332. The two first protrusions 13331 are separated by the two first recesses 13332, and a first inclined surface 13333 is provided between adjacent first protrusions 13331 and first recesses 13332. The bottom wall of the third connecting groove 1342 has two opposing second protrusions 13421 and two opposing second recesses 13422. The two second protrusions 13421 are separated by the two second recesses 13422, and a second inclined surface 13423 is provided between adjacent second protrusions 13421 and second recesses 13422. When the locking seat 134 is in the closed position, the two second protrusions 13421 are respectively engaged in the two first recesses 13331, and the two first protrusions 13331 are respectively engaged in the two second recesses 13422. When the locking seat 134 pivots from the closed position to the unfolded position, the first protrusions 13331 disengage from the second recesses 13422. Through the abutment engagement of the second inclined surface 13423 and the first inclined surface 13333, the first protrusions 13331 slide to the position abutting against the second protrusions 13421, and the locking seat 134 slides away from the fixed seat 133.

[0195] Referring to Figures 39 to 41, in one embodiment, the fixing seat 133 is provided with a mounting groove 1334. The mounting groove 1334 accommodates the side rod of the support frame 13. The mounting groove 1334 is fixed to the corresponding side rod by fasteners, such as rivets, screws, bolts, and nuts, thereby realizing the connection between the fixing 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 fixing 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 fixing seat 133. Optionally, the first elastic element 1331 can be a spring, a sheet, a torsion spring, etc., as long as it can continuously apply pressure to the locking seat 134.

[0196] Referring to Figures 40 and 41, the cavity of the connecting end 1333 of the fixed seat 133 has a first connecting shaft 13334. The third connecting groove 1342 of the locking seat 134 is also provided with a protrusion 13424. Two opposing second protrusions 13421 and two opposing second recesses 13422 are located around the protrusion 13424. The protrusion 13424 has a mating hole 13425. The first connecting shaft 13334 is inserted into the mating hole 13425. The locking seat 134 can pivot relative to the fixed seat 133 about the axial direction 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 locking seat 134 relative to the fixed seat 133 and prevent the locking seat 134 from rotating excessively.

[0197] In the embodiment shown in Figures 40 and 41, the limiting rib 13335 is disposed on the first connecting shaft 13334, and the limiting groove 13426 is disposed in the mating hole 13425. The included angle between the two circumferential ends of the limiting groove 13426 is approximately 90°. Thus, the engagement of the locking seat 134 with the limiting groove 13426 and the limiting rib 13335 allows the locking seat 134 to rotate approximately 90° between the unfolded position and the retracted position. Specifically, when the locking seat 134 is in the closed position (as shown in Figure 30, for example), the limiting rib 13335 abuts against one end of the limiting groove 13426, thereby restricting the locking seat 134 from rotating in the counterclockwise direction (refer to direction D3 in Figure 30). The locking seat 134 can only rotate in the clockwise direction (refer to direction D4 in Figure 30). When the locking seat 134 is rotated approximately 90° clockwise, the locking seat 134 reaches the unfolded position shown in Figure 41. At this time, the limiting rib 13335 abuts against the other end of the limiting groove 13426, thereby restricting the locking seat 134 from continuing to rotate in the clockwise direction (refer to direction D4 in Figure 31). The locking seat 134 can only rotate back to the closed position in the counterclockwise direction (refer to direction D3 in Figure 31). Those skilled in the art will understand that the approximately 90° rotation range in this embodiment is merely exemplary. Those skilled in the art can set other suitable 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 locking seat 134 reaches the unfolded position shown in FIG41, the locking seat 134 rotates approximately 90° again in a clockwise direction (refer to direction D4 in FIG31) to disengage from the unfolded position and reach another retracted position.

[0198] Referring again to Figures 39 to 41, in one embodiment, the end cap 1335 has a second connecting shaft 13351 extending toward the mounting base 133, and the end cap 1335 can be connected to the mounting base 133 by fasteners (not shown) such as rivets passing through the first connecting shaft 13334 and the second connecting shaft 13351.

[0199] Referring to Figures 40 and 41, the connecting end 1333 is provided with a locking hole 1332. The locking seat 134 includes a mounting cavity 1343 and a release operation member 1341, which is slidably disposed in the mounting cavity 1343. The release operation member 1341 includes a locking part 13411 and a pressing part 13413. When the locking seat 134 pivots to the unfolded position, the locking part 13411 enters the locking hole 1332 to lock the locking seat 134 in the unfolded position. The pressing part 13413 is connected to the locking part 13411. By applying pressure to the pressing part 13413, the release operation member 1341 slides away from the locking hole 1332, causing the locking part 13411 to disengage from the locking hole 1332, thereby releasing the lock on the locking seat 134. Optionally, the mounting cavity 1343 is provided with a sliding groove 13431. The release operation member 1341 is slidably connected to the sliding groove 13431 via a pin 13412, thereby allowing the release operation member 1341 to slide along the length of the sliding groove 13431, so that the locking part 13411 enters or exits the lock hole 1332. Optionally, the locking seat 134 includes a second elastic member 13414. One end of the second elastic member 13414 is fixed in the mounting cavity 1343, and the other end of the second elastic member 13414 abuts against the release operation member 1341. The second elastic member 13414 continuously applies pressure to the release operation member 1341, causing the release 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 sheet spring, a torsion spring, etc., as long as it can continuously apply pressure to the release operation member 1341. Optionally, the latching 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 within the latching seat 134, in which an installation cavity 1343 is disposed.

[0200] Referring to Figures 42 to 45, in one embodiment, the seat fixing mechanism 132 includes a fixing seat 233 and a locking seat 234. The locking seat 234 is pivotally connected to the fixing seat 233 and is pivotable between a folded position and an unfolded position. Specifically, the trolley includes a support frame 13, on which a seat fixing mechanism 132 is connected to each of the two side rods (i.e., rods extending generally along the length direction L), as shown in Figure 42. For ease of description, only one seat fixing mechanism 132 will be described below. Those skilled in the art should understand that the seat fixing mechanisms 132 on both side rods have the same structure and pivot simultaneously between the folded and unfolded positions. It should be noted that in actual use, the locking seats 234 of the seat fixing mechanism 132 set on the two side bars pivot simultaneously between the folded position and the unfolded position. This is intended to facilitate the folding and unfolding operation of the trolley and to connect the seat 135, as shown in Figures 43 and 45. This is required for actual use scenarios, but it does not mean that the two locking seats 234 cannot pivot independently.

[0201] Referring again to Figures 42 to 45, in one embodiment, the latching seat 234 includes an engagement portion 2346 and a base portion 2349. The engagement portion 2346 is configured to insert into an engagement groove (not shown) in the seat 135, and the base portion 2349 is connected to the engagement portion 2346 and pivotally connected to the retaining seat 233. Optionally, the engagement portion 2346 and the base portion 2349 are integrally formed. Optionally, referring to Figure 43, there is an arcuate transition region between the engagement portion 2346 and the base portion 2349, and the width of the engagement portion 2346 is smaller than the width of the base portion 2349 to accommodate the shape of the sidewall of the seat 135.

[0202] Referring to Figures 46 and 47, in one embodiment, when the locking seats 234 are in the retracted position, the distance between the joint portions 2346 of the two locking seats 234 is L1, and the distance between the base portions 2349 of the two locking seats 234 is L2, as shown in Figure 46. 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 the joint portions 2346 of the two locking seats 234 are located below the two side rods of the support frame 13 and are at least partially blocked by the two side rods, the distance between the two joint portions 2346 marked in Figure 46 is similar to the distance between the two side rods of the support frame 13. Those skilled in the art will understand that the distance between the two side rods of the support frame 13 can be changed according to actual needs to alter the size of L1. When the locking seats 234 are in the unfolded position, the distance between the joints 2346 of the two locking seats 234 is L1', and the distance between the bases 2349 of the two locking seats 234 is L2', as shown in Figure 47. Optionally, 301.86mm ≤ L1' ≤ 368.94mm, L1' is approximately 335.4mm for example; L2' is approximately 302mm for example. Those skilled in the art will understand that in actual use, the appropriate size of L1' can be selected according to the distance between the two engagement slots of the seat 135 to be fixed. Pivoting from the unfolded position to the retracted position, the distance between the two locking seats 234 increases by ΔL (i.e., L1-L1') or ΔL (i.e., L2-L2'), for example, ΔL is approximately 44mm, as shown in Figures 46 and 47. The latching seat 234 in the folded position is lower than the upper surface of the fixed seat 233 in the height direction H, that is, located below the corresponding side rod of the support frame 13, as shown in FIG. 48. Compared with the embodiments shown in FIG. 30 to FIG. 41, the two latching seats 234 in this embodiment have a larger distance L1 in the folded position, thereby encroaching less on the space between the two side rods of the support frame 13. This is beneficial in two ways: firstly, it helps to reduce the interference of the latching seats 234 with other parts of the stroller when the stroller is folded; secondly, the seat can be used without the stroller. The increased distance between the two latching seats 234 in the folded position helps to reduce the interference of the latching seats 234 with the user's work, such as reducing the interference and obstruction of the latching seats 234 with the activities of children sitting in the compartment formed by the support frame 13 and the cover, or reducing the interference and obstruction of the latching seats 234 with the user's access to the support frame. The seat 135 according to this embodiment is the same as the seat 135 according to the embodiments shown in FIG. 30 to FIG. 41.

[0203] Referring to Figure 45, in one embodiment, the upper end of the joint 2346 is provided with a first locking hole 2347 and / or the lower end of the base 2349 is provided with a second locking hole 2348. The first locking hole 2347 is used to engage with the rod in the engagement groove of the seat 135 to stably fix the seat 135 installed on the trolley and prevent it from shaking. The second locking hole 2348 is used to engage with the engaging protrusion of the seat 135 to make the fixation of the seat 135 more secure.

[0204] Referring to Figure 49, in one embodiment, the fixed 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 fitted onto 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 fixed 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 is pivoted to the retracted position, in the height direction H, the engaging base 234 does not protrude from the upper surface of the fixed base 233. Optionally, referring to Figure 48, when the engaging base 234 is pivoted to the retracted position, in the height direction H, the engaging base 234 is lower than the upper surface of the fixed base 233. Optionally, the fixing seat 233 is further provided with a limiting portion 2333, and the engaging seat 234 is further provided with a limiting hole 2344. When the engaging seat 234 pivots to the closed position, the limiting portion 2333 engages in the limiting hole 2344. Optionally, the positions of the limiting portion 2333 and the limiting hole 2344 can be interchanged, that is, the fixing seat 233 is further provided with a limiting hole 2344, and the engaging seat 234 is provided with a limiting portion 2333. Optionally, the limiting portion 2333 includes a plurality of finger-shaped elastic elements 23331, which are spaced apart from each other. The end of each elastic element 23331 away from the fixing seat 233 is protruding and provided with a guide slope 23332. When the elastic element 23331 is inserted into the limiting hole 2344, the inner wall of the limiting hole 2344 compresses the guiding inclined surface 23332, causing the elastic element 23331 to deform toward the space between the elastic elements 23331. After the elastic element 23331 is inserted into the limiting hole 2344, due to the elastic restoring force of the elastic element 23331, the elastic element 23331 presses against the inner wall of the limiting hole 2344, and the protruding end passes through the limiting hole 2344 and stops against the peripheral wall of the limiting hole 2344, thereby preventing the elastic element 23331 from coming out of the limiting hole 2344. In actual use, the user applies a certain pulling force to the locking seat 234 to overcome the movement restriction between the protruding end and the limiting hole, causing the locking seat 234 to slide away from the fixed seat 233. Optionally, the fixing seat 233 is provided with an arc-shaped connecting body 2330, and the locking seat 234 is provided with a groove 2340, the shape of which matches the shape of the connecting body 2330. Specifically, the connecting body 2330 is configured to protrude from the side of the fixing seat 233 toward the locking seat 234, and the groove 2340 is configured to protrude from the side of the locking seat 234 toward the fixing seat 233. When the locking seat 234 is in the closed position, the connecting body 2330 and the groove 2340 are misaligned with each other.When the locking seat 234 needs to be pivoted to the unfolded position, the user applies a pulling force to the locking seat 234, causing the elastic element 23331 to disengage from the limiting hole 2344. The locking seat 234 slides away from the fixed seat 233, and one end of the connecting body 2330 aligns with one end of the groove 2340. The user then rotates the locking seat 234, causing the connecting body 2330 to gradually enter the groove 2340. When the locking seat 234 is rotated to the unfolded position, the connecting body 2330 is fully engaged in the groove 2340. Optionally, the positions of the connecting body 2330 and the groove 2340 can be interchanged; that is, the fixed seat 233 also has a groove 2340, and the locking seat 234 has a connecting body 2330. Optionally, the connecting body 2330 has a first connecting groove 2331 and a first connecting edge 2332, and the groove 2340 has a second connecting groove 2341 and a second connecting edge 2342. When the locking seat 234 pivots to the unfolded position, the second connecting groove 2341 accommodates the first connecting edge 2332, and the second connecting edge 2342 enters the first connecting groove 2331. Optionally, the first connecting groove 2331 can be a dovetail groove or a cuboid-shaped recess. Optionally, one of the connecting body 2330 and the groove 2340 is provided with a limiting recess 2334, and the other of the connecting body 2330 and the groove 2340 is provided with a limiting member 2345. When the locking seat 234 pivots to the unfolded position, the limiting member 2345 engages in the limiting recess 2334 to lock the locking seat 234 in the unfolded position. In this embodiment, a third elastic member (not shown) can also be provided between the fixed seat 233 and the locking seat 234. The third elastic member abuts against the locking seat 234 and continuously applies pressure to the locking seat 234, causing the locking seat 234 to have a tendency to slide towards the fixed seat 233. In other embodiments, the third elastic element may be omitted, and the engaging seat 234 may be moved along the pivot axis 235 toward the fixed seat 233 by a user's pushing operation.

[0205] The working principles of the embodiments shown in Figures 30 to 41 and Figures 42 to 49 will be described below.

[0206] For the trolley in the embodiments shown in Figures 30 to 41, when the seat 135 is not installed, the locking seat 134 of the seat fixing mechanism 132 is in the folded position as shown in Figure 30. At this time, the seat fixing mechanisms 132 on both sides of the trolley have a large distance L1 (or L2). When it is necessary to install the seat 135, if necessary, accessories that interfere with the seat 135 need to be removed, such as the tray assembly 130; if the tray assembly 130 does not interfere with the assembly of the seat 135, it is not necessary to remove the tray assembly 130. When the user pivots the locking seat 134 from the folded position to the unfolded position, during the pivoting process, due to the cooperation between the connecting end 1333 and the third connecting groove 1342, the locking seat 134 also slides away from the fixing seat 133, that is, the locking seats 134 on both sides of the trolley will slide towards each other. Therefore, the distance between the seat fixing mechanisms 132 on both sides of the trolley will be reduced to L1' (or L2') to match the distance between the two engagement slots of the seat 135. When the locking seat 134 pivots to the unfolded position, under the action of the second elastic member 13414, the locking part 13411 enters the locking hole 1332, locking the locking seat 134 in the unfolded position. At this time, the engagement part 1346 is inserted into the engagement slot of the seat 135, and the back of the seat 135 can be further engaged with the support frame 13 (as shown in Figure 37, the seat 135 is also engaged with the front rod of the support frame 13), completing the fixed installation of the seat 135. When the seat 135 is not in use, the engagement part 1346 is pulled out from the engagement slot 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 part 13413 of the release mechanism 1341, causing the locking part 13411 to disengage from the lock hole 1332. Then, the locking seat 134 is pivoted toward the closed position. Under the action of the first elastic member 1331, the locking seat 134 slides toward the fixed seat 133. When the locking seat 134 is pivoted to the closed position, the seat fixing mechanisms 132 on both sides of the trolley are increased to L1 (or L2) again.

[0207] For the trolley in the embodiments shown in Figures 42 to 49, when the seat 135 is not installed, the engaging seat 234 of the seat fixing mechanism 132 is in the folded position as shown in Figure 46. At this time, the engaging seat 234 is lower than the upper surface of the fixing seat 233 in the height direction H, and the seat fixing mechanisms 132 on both sides of the trolley have a large distance L1 (or L2). When it is necessary to install the seat 135, if necessary, accessories that interfere with the seat 135 need to be removed, such as the tray assembly 130. Then, the user pivots the engaging seat 234 from the folded position to the unfolded position. Specifically, the user first pulls the engaging seat 234 away from the fixing seat 233, so that the limiting part 2333 disengages from the limiting hole 2344. As a result, the distance between the seat fixing mechanisms 132 on both sides of the trolley is reduced to L1' (or L2') to match the distance between the two engagement slots of the seat 135. Then, the user pivots the engaging seat 234 towards the unfolded position. During pivoting, the second connecting groove 2341 accommodates the first connecting edge 2332, and the second connecting edge 2342 enters the first connecting groove 2331, thereby allowing the arc-shaped connecting body 2330 to gradually enter and engage with the groove 2340. When the locking seat 234 pivots to the unfolded position, the limiting member 2345 engages in the limiting recess 2334, and the locking seat 234 is locked in the unfolded position. At this time, the connecting part 2346 is inserted into the engaging groove of the seat 135, and the back of the seat 135 can be further engaged onto the support frame 13, completing the fixed installation of the seat 135. When the seat 135 is no longer needed, the connecting part 2346 is pulled out from the engaging groove of the seat 135, and the seat 135 is removed. When the user pivots the locking seat 234 toward the folded position, the locking seat 234 slides toward the fixed seat 233 under the action of the third elastic member or the user's pushing operation. When the card holder 234 pivots to the closed position, the seat fixing mechanisms 132 on both sides of the trolley increase to L1 (or L2) again.

[0208] Referring to Figures 50 and 51, one embodiment of this application provides a storage assembly 3. This storage assembly 3 is disposed, for example, on a rider 14. Specifically, the storage assembly 3 includes a mounting bracket 30 and a container 31. In this embodiment, the rider 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 a straight tube connected to the end of the push handle 142 via a pivot assembly 4. The push handle 142 and the extension rod 145 can pivot relative to each other via the pivot assembly 4, thereby reducing the volume of the trolley when folded. The pivot assembly 4 includes a first connector 41 and a second connector 42 pivotally connected to each other. The first connector 41 is connected to the push handle 142, and the second connector 42 is connected to the extension rod 145. Optionally, a release button 410 is provided on the first connector 41. For example, a release button 410 is provided on the inner side of the first connector 41 to release the lock between the push handle 142 and the extension rod 145, allowing the push handle 142 to pivot relative to the extension rod 145. The locking and releasing mechanism between the push handle 142 and the extension rod 145 can use any locking and releasing mechanism known in the art, and this application does not limit it. In this embodiment, the storage assembly 3 is connected to the pivot assembly 4. Specifically, in this embodiment, the second connector 42 of the pivot assembly 4 is used as a mounting bracket 30. Optionally, the mounting bracket 30 can be fixedly installed at other positions of the rider 14 as needed, such as the extension rod 145, the push handle 142, etc., or fixedly installed in other parts of the frame, such as the rear footrest 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 in Figures 1 to 49.

[0209] In the embodiments shown in Figures 50 and 51, a first protrusion 302 and a second protrusion 303 are sequentially provided on the outer wall 301 of the mounting bracket 30. The first protrusion 302 and the second protrusion 303 form a generally umbrella-shaped structure, wherein the first protrusion 302 is radially recessed relative to the second protrusion 303, thereby forming a first engaging groove 304 between the side of the second protrusion 303 facing the vehicle frame and the outer wall 301 of the mounting bracket 30. The container 31 is provided with an engaging mechanism 32 for detachable connection to the mounting bracket 30. Specifically, the engaging mechanism 32 includes an engaging edge 321 that forms a generally U-shaped second engaging groove 324. Each of the two opposite edges of the generally U-shaped second engaging groove 324 is provided with, for example, a locking protrusion 322, thereby dividing the second engaging groove 324 into a guide portion 3241 and an engaging portion 3242. The distance between the two locking protrusions 322 is slightly smaller than the radial dimension of the first protrusion 302; the shape of the engaging portion 3242 is similar to the outer peripheral shape of the first protrusion 302, and the radial dimension of the engaging portion 3242 is substantially equal to (or slightly larger than) the radial dimension of the first protrusion 302, so that the first protrusion 302 can be accommodated in the engaging portion 3242; the guide portion 3241 has an opening 3243 (i.e., the opening 3243 of the generally U-shaped second engaging groove 324), and the radial dimension of the guide portion 3241 is larger than the radial dimension of the first protrusion 302. Preferably, the radial dimension of the guide portion 3241 is larger than the radial dimension of the first protrusion 302 and smaller than the radial dimension of the second protrusion 303. When installing the container 31, the opening 3243 of the second engaging groove 324 is aligned with the first protrusion 302, so that the first protrusion 302 enters the guide portion 3241. Continue moving the container 31 until the first protrusion 302 contacts the two locking protrusions 322. At this time, because the distance between the two locking protrusions 322 is slightly smaller than the radial dimension of the first protrusion 302, the first protrusion 302 is close to the two locking protrusions 322. The external force applied by the user to drive the container 31 to move causes the first protrusion 302 to press against the two locking protrusions 322, thereby causing the two locking protrusions 322 to deform in a direction away from each other, so that the first protrusion 302 enters the engaging portion 3242 of the second engaging groove 324. When the first protrusion 302 is fully engaged with the engaging portion 3242, the first protrusion 302 is accommodated within the engaging portion 3242, and the first protrusion 302 no longer presses against the two locking protrusions 322. Consequently, the two locking protrusions 322 reset under their own elastic restoring force. At this point, a portion of the engaging edge 321 enters the first engaging groove 304, and the first protrusion 302 is accommodated and locked within the engaging portion 3242. Thus, the container 31 is fixed to the mounting bracket 30, and the storage assembly 3 is installed.

[0210] In one embodiment, optionally, a deformation groove 323 is provided on the portion of the engaging edge 321 near the locking protrusion 322. When the first protrusion 302 presses against the locking protrusion 322, the deformation groove 323 helps the locking protrusion 322 deform in a direction away from the other locking protrusion 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 near the second engaging groove 324. When the first protrusion 302 is locked in the engaging portion 3242, the support rib 33 abuts against the outer wall of the second protrusion 303 to make the locking more secure.

[0211] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0212] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the scope of the patent application.

[0213] 1: Frame 10: Base frame 100: First shot 1001: First Bend 1002: Closing Hook 10010: First Avoidance Space 101: First reinforcing bar 102: Second reinforcing bar 103: Second shot 1031: Front Pole 1032: Rear lever 11: Front pole 110: Front foot seat 12: Rear foot bar 120: Rear foot seat 121: Second bend 1210: Second Avoidance Space 122: Outer convex part 123: Concave part 13: Support frame 130: Dinner Plate Components 131 Awning Components 132: Seat fixing mechanism 133: Fixed base 1331: First elastic element 1332: Keyhole 1333: Connecting end 13331:The first convex part‌ 13332:The first concave part‌ 13333: First inclined plane 13334: First connecting shaft 13335: Limiting Rib 1334: Mounting Slot 1335: End Cap 134: Card Seat 1340: Mounting through hole 1341: Release mechanism 13411: Locking Department 13412: Pin 13413: Pressing part 13414: Second elastic element 1342: Third connecting slot 13421:The second convex part‌ 13422:Second recess‌ 13423:Second slope‌ 13424: Protrusion 13425: Fitting Hole 13426: Limiting groove 1343: Installation cavity 13431: Slide 1344: Cover Plate 1345: Outer shell 1346: Joint 1347: First gacha hole 1348: Second gauging hole 1349: Base 135: Seat 14: Driver 140: Inner rod 141: Outer rod 1410: Locking hole 142: Push handle 143: Connecting convex 145: Extension rod 15: Locking joints 151: First Connecting Seat 1510: First protrusion 152: Second connecting seat 1520: First locking slot 1521: First locking convexity 1522: Second Prominence 16: Release mechanism 160: Release mechanism 161: First connector 162: Locking component 163: First reset component 1620: Second locking convexity 1621: Second locking slot 17: Rider length adjustment mechanism 170: Adjustment button 171: Second reset component 172: Second connector 173: Adjustment parts 1730: Straight Groove 1731: Locking component 1732: Pin 174: Drive components 175: Third reset component 18: Linkage rod 19: Pull rod 190: Handle 1901: Handle 1902: Installation Department 191: Connecting rod 1910: First pivot hole 192: Rotating part 1921: Main Body 1922: Connection end 19220: First connecting hole 19221: Receiving cavity 1923: Limiting convexity 1924: Second pivot hole 193: First positioning component 1931: Damping plate 19310: Third pivot hole 1932: First positioning recess 194: Third Connector 1941: First through hole 1942: Second through hole 1943: Fourth Pivot Hole 1944: Pivot Space 19440: Limiting groove 19441: Sidewall 1945: First limiting convex point 195: Pivot Pin 196: Slide rail 1960: Second positioning component 1961: Second positioning hole 19601: First Convex Pole 1962: Third positioning component 1963: Third positioning hole 19621: Second convex pillar 197: Storage Items 1970: Storage Slot 198: Fixing Part 1980: Fixing Hole 1981: First Fixed Part 1982: Second Fixed Part 199: Elasticity Index 2: Pull rod mechanism 233: Fixed base 2330: Connector 2331: First connecting slot 2332: First connecting edge 2333: Limiting Part 23331: Elastic component 23332: Guiding slope 2334: Limiting concave 234: Card Seat 2340: Tank 2341: Second connecting slot 2342: Second connecting edge 2343: Mounting Hole 2344: Limiting hole 2345: Limiting component 2346: Joint 2347: First gacha hole 2348: Second gacha slot 2349: Base 235: Pivot axis 3: Storage components 30: Mounting bracket 301:Outer wall‌ 302: First protrusion 303: Second protrusion 304: First card slot 31: Container 32: Card-connecting mechanism 321: Engaging Edge 322: Locking Protrusion 323: Deformation groove 324: Second card slot 3241: Guidance Department 3242: Kahebu 3243: Opening 33: Supporting rib 4: Pivot Component 41: First Connector 42: Second connector 410: Release button D1: Plane D2: Extension direction D3, D4: direction H: Height direction L: Length direction L1, L2, L1', L2': Spacing W: Width direction α, β, γ: included angle

Claims

1. A lever mechanism (2), characterized in that it comprises: A third connecting seat (194); a rotating part (192) connected to the third connecting seat (194) and pivotable relative to the third connecting seat (194) between a first pivot position and a second pivot position; a pull rod (19) one end connected to the rotating part (192), wherein when the rotating part (192) pivots to the first pivot position, the pull rod (19) pivots to an upright position, and when the rotating part (192) pivots to the second pivot position, the pull rod (19) pivots to a reclining position; and a first positioning member (193) disposed between the third connecting seat (194) and the rotating part (192), the first positioning member (193) being configured to restrict the pivoting of the rotating part (192); wherein the first positioning member (193) comprises: A positioning recess (1932) is provided in one of the rotating part (192) and the third connecting seat (194); and a positioning protrusion (1945) is provided in the other of the rotating part (192) and the third connecting seat (194). When the positioning protrusion (1945) enters the positioning recess (1932), the rotation of the rotating part (192) is restricted by the shape matching of the positioning recess (1932) and the positioning protrusion (1945).

2. The lever mechanism (2) as claimed in claim 1, wherein the first positioning element (193) is a damping plate, the damping plate being clamped between the rotating part (192) and the third connecting seat (194).

3. The lever mechanism (2) as claimed in claim 2, wherein one end of the third connecting seat (194) is recessed to form a pivot space (1944), at least a portion of the rotating part (192) is received in the pivot space (1944), and the damping plate is clamped between the rotating part (192) and the sidewall of the pivot space (1944).

4. The lever mechanism (2) as claimed in claim 3, wherein the pivot space (1944) includes two opposing sidewalls (19441), at least a portion of the rotating part (192) is located between the two sidewalls (19441) of the pivot space (1944), and the first positioning member (193) includes two damping plates, the two damping plates being clamped between the two sidewalls (19441) of the pivot space (1944) and the rotating part (192).

5. The lever mechanism (2) as described in claim 1, wherein: One end of the third connecting seat (194) is recessed inward to form a pivot space (1944). At least a portion of the rotating part (192) is received in the pivot space (1944). The inner surface of at least one sidewall of the pivot space (1944) faces at least one surface of the rotating part. One of the surface of the rotating part (192) and the sidewall of the pivot space is provided with at least one elastic finger (199). The other of the surface of the rotating part (192) and the sidewall of the pivot space is provided with a plurality of positioning recesses (1932). The positioning protrusion (1945) is provided on the side of the elastic finger (199) facing the positioning recess (1932). The positioning protrusion (1945) engages with one or more of the positioning recesses (1932) to position the pull rod at one of the plurality of pivot angles.

6. A lever mechanism (2), comprising: A third connecting seat (194); a rotating part (192) connected to the third connecting seat (194) and pivotable relative to the third connecting seat (194) between a first pivot position and a second pivot position; a pull rod (19) one end connected to the rotating part (192), wherein when the rotating part (192) pivots to the first pivot position, the pull rod (19) pivots to an upright position, and when the rotating part (192) pivots to the second pivot position, the pull rod (19) pivots to a reclining position; and a first positioning member (193) disposed between the third connecting seat (194) and the rotating part (192), the first positioning member (193) being configured to restrict the pivoting of the rotating part (192); One end of the third connecting seat (194) is recessed inward to form a pivoting space (1944). At least a portion of the rotating part (192) is received in the pivoting space (1944). The inner wall of the pivoting space (1944) of the third connecting seat (194) is provided with a limiting groove (19440). The rotating part (192) is provided with a limiting protrusion (1923). The limiting protrusion (1923) slides in the limiting groove (19440) as the rotating part (192) pivots. When the rotating part (192) pivots from the first pivoting position to the second pivoting position, the limiting protrusion (1923) abuts against the side wall of the limiting groove (19440) to restrict the rotating part (192) from continuing to pivot.

7. A lever mechanism (2), comprising: A third connecting seat (194); a rotating part (192) connected to the third connecting seat (194) and pivotable relative to the third connecting seat (194) between a first pivot position and a second pivot position; a pull rod (19) one end connected to the rotating part (192), wherein when the rotating part (192) pivots to the first pivot position, the pull rod (19) pivots to an upright position, and when the rotating part (192) pivots to the second pivot position, the pull rod (19) pivots to a reclining position; and a first positioning member (193) disposed between the third connecting seat (194) and the rotating part (192), the first positioning member (193) being configured to restrict the pivoting of the rotating part (192); The slide rail (196) is connected to the third connecting seat (194) and can slide along the slide rail (196) between a first sliding position and a second sliding position; when the third connecting seat (194) slides to the first sliding position, the pull rod (19) slides to the extended position; when the third connecting seat (194) slides to the second sliding position, the pull rod (19) slides to the retracted position.

8. The lever mechanism (2) as described in claim 7 further includes: A locking device is provided on the third connecting seat (194) and the slide rail (196), the locking device being used to lock the third connecting seat (194) in the first sliding position and / or the second sliding position.

9. The lever mechanism (2) as described in claim 8, wherein: The third connecting seat (194) is provided with a first through hole (1941) slidably sleeved on the slide rail (196). The locking device includes: a second through hole (1942) disposed on the side wall of the first through hole (1941); a second positioning hole (1961) disposed on the portion of the slide rail (196) corresponding to the first sliding position of the third connecting seat (194); a second positioning member (1960) disposed in the slide rail (196), at least a portion of the second positioning member (1960) being 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.

10. The lever mechanism (2) as described in claim 8, wherein: The third connecting seat (194) is provided with a first through hole (1941) slidably sleeved on the slide rail (196). The locking device includes: a second through hole (1942) disposed on the side wall of the first through hole (1941); a third positioning hole (1963) disposed on the portion of the slide rail (196) corresponding to the second sliding position of the third connecting seat (194); a third positioning member (1962) disposed in the slide rail (196), at least a portion of the third positioning member (1962) being 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.

11. The lever mechanism (2) as described in claim 8 further includes: The fixed part (198) is connected to the slide rail (196). When the rotating part (192) pivots from the second pivot position to the first pivot position, the pull rod (19) abuts against the front surface of the fixed part (198) to limit the rotating part (192) from continuing to pivot.

12. A trolley, comprising: Base frame (10); And a lever mechanism (2) as described in any one of claims 1-11, the lever mechanism (2) being connected to the base frame (10).

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