Carrier, limiting mechanism and stroller

Abstract

A carrier, a limiting mechanism and a stroller. The stroller comprises: a frame (C100), an armrest frame (C200), and a stop mechanism (C300). The frame (C100) comprises a seat frame (C130), and the frame (C100) has an unfolded state. The armrest frame (C200) is pivotally connected to the frame (C100). When the frame (C100) is in the unfolded state, the armrest frame (C200) has a first deployed position and a second deployed position, and is closer to the seat frame (C130) in the first deployed position than in the second deployed position. The stop mechanism (C300) is arranged between the frame (C100) and the armrest frame (C200), and is adapted to prevent the armrest frame (C200) from switching from the first deployed position to the second deployed position.

Description

Vehicle, limiting mechanism and trolley Technical Field

[0001] This invention relates to the technical field of vehicles, and in particular to a vehicle, a limiting mechanism, and a trolley. Background Technology

[0002] Currently, to facilitate infants' and toddlers' travel and meet the travel needs of infants of different ages, strollers can generally be equipped with child safety seats or infant carriers. However, the limiting mechanisms for installing child safety seats or infant carriers on existing strollers on the market are generally quite complex, and most require additional accessories or structures to achieve this, which not only affects the overall appearance of the stroller but also makes it inconvenient to operate.

[0003] Furthermore, with the fast pace of life and limited urban living space, users have placed higher demands on the portability and storage efficiency of strollers. To address the issues of traditional strollers being bulky and inconvenient to carry, foldable strollers have emerged. This design allows users to fold it up when not in use, reducing its size and facilitating storage and transportation. While foldable strollers have made progress in improving convenience, some shortcomings still exist in practical operation. Especially during the folding process, users often need to operate the frame and armrests separately, which not only increases the complexity of operation but also affects the overall user experience.

[0004] Generally, armrests improve child safety when riding. When the frame is folded, the armrest folds down simultaneously, reducing the stroller's size when folded; however, when the frame is unfolded, parents need to manually turn the armrest to the open position before use. However, in actual use, children may accidentally turn the armrest. Because children have limited strength, their body parts (such as hands, arms, or heads) can easily get stuck in the gap between the armrest and the frame (such as the seat frame) when turning the armrest, leading to injury and reducing the safety and reliability of the stroller. Summary of the Invention

[0005] Therefore, it is necessary to provide a vehicle and a limiting mechanism to address the above problems. The vehicle and limiting mechanism have a simple structure, are easy to operate, and do not affect the overall appearance of the vehicle.

[0006] A limiting mechanism for a vehicle, comprising:

[0007] A mounting base for fixing to the first carrier body; and

[0008] The engaging component is rotatably mounted on the fixed base and can be switched between a first position and a second position;

[0009] The engaging member can be held in either the first or the second position relative to the fixed seat by engaging with the fixed seat. When the engaging member is in the first position, it can restrict the second vehicle body onto the first vehicle body. When the engaging member is in the second position, it releases the restriction on the second vehicle body onto the first vehicle body.

[0010] In the aforementioned limiting mechanism, the fixed base is fixed to the first vehicle body, and the engaging member is rotatably mounted on the fixed base. The engaging member, through its own engaging engagement with the fixed base, can maintain itself in either a first or a second position relative to the fixed base. By switching the position of the engaging member mounted on the fixed base between the first and second positions, the limiting of the second vehicle body relative to the first vehicle body can be selectively achieved. This limiting mechanism has a simple overall structure, is easy to operate, and does not affect the overall appearance of the vehicle.

[0011] In one embodiment, one of the fixing base and the engaging member is provided with an engaging protrusion, and the other of the fixing base and the engaging member is provided with an engaging recess that can cooperate with the engaging protrusion. When the engaging member is in the first position or the second position, the engaging protrusion and the engaging recess are engaged.

[0012] In one embodiment, the engaging recess includes a first engaging recess and a second engaging recess. When the engaging member is in the first position, the engaging protrusion and the first engaging recess engage with each other. When the engaging member is in the second position, the engaging protrusion and the second engaging recess engage with each other. Or

[0013] The engaging protrusion includes a first engaging protrusion and a second engaging protrusion. When the engaging member is in the first position, the first engaging protrusion engages with the engaging recess. When the engaging member is in the second position, the second engaging protrusion engages with the engaging recess.

[0014] In one embodiment, the engaging recess includes a first engaging recess and a second engaging recess. When the engaging member is in the first position, the engaging protrusion and the first engaging recess engage with each other. When the engaging member is in the second position, the engaging protrusion and the second engaging recess engage with each other. The fixing seat is provided with an engaging protrusion. The engaging member is pivotally connected to the fixing seat via a pivot shaft. The engaging member has an arc-shaped engaging surface spaced apart from the pivot shaft. The engaging surface has the first engaging recess and the second engaging recess spaced apart circumferentially along the engaging surface.

[0015] In one embodiment, the engaging surface is further provided with an avoidance groove, which is located between the first engaging recess and the second engaging recess. The groove walls at both ends of the avoidance groove along the circumference of the engaging surface form a pushing slope, which is used to abut against the engaging protrusion.

[0016] In one embodiment, the limiting mechanism further includes:

[0017] The first reset component is disposed between the fixed base and the engaging component;

[0018] One of the fixing base and the engaging member is provided with an engaging protrusion, and the other of the fixing base and the engaging member is provided with an engaging recess that can cooperate with the engaging protrusion.

[0019] When the engaging member is in the first position, the engaging protrusion and the engaging recess engage with each other, and the first resetting member applies force to the engaging member to rotate the engaging member to the second position; or, when the engaging member is in the second position, the engaging protrusion and the engaging recess engage with each other, and the first resetting member applies force to the engaging member to rotate the engaging member to the first position.

[0020] In one embodiment, one of the fixing base and the engaging member is movably provided with a locking pin, and the other of the fixing base and the engaging member is provided with an engaging recess;

[0021] The locking pin is switchable between a second locking position and a second unlocking position. When the locking pin is in the second locking position, it is adapted to engage with the engagement recess to lock the engaging member in the first position or the second position. When the locking pin is in the second unlocking position, it is adapted to disengage from the engagement recess to release the locking of the engaging member in the first position or the second position.

[0022] In one embodiment, the limiting mechanism further includes a first reset member disposed between the fixed base and the engaging member;

[0023] When the engaging member is in the first position and the locking pin is in the second locking position, the locking pin engages with the engaging recess, and the first reset member applies force to the engaging member to rotate the engaging member to the second position; or, when the engaging member is in the second position and the locking pin is in the second locking position, the locking pin engages with the engaging recess, and the first reset member applies force to the engaging member to rotate the engaging member to the first position.

[0024] In one embodiment, the limiting mechanism further includes a second reset member adapted to apply force to the locking pin to switch it to the second locked position, and the other of the fixing seat and the engaging member is adapted to push against the locking pin to switch it to the second unlocked position.

[0025] In one embodiment, the locking pin is disposed on the fixed base and is movable between the second locking position and the second unlocking position, and the engaging member is provided with the engaging recess.

[0026] In one embodiment, the fixing base is provided with a mounting groove, the locking pin is at least partially disposed in the mounting groove, and the two ends of the second reset member abut against the bottom of the mounting groove and the locking pin, respectively.

[0027] In one embodiment, the limiting mechanism further includes:

[0028] The first reset component is disposed between the fixed base and the engaging component;

[0029] The first reset member applies force to the engaging member to cause the engaging member to rotate toward the first position or the second position.

[0030] In one embodiment, the fixing base has a first limiting portion and a second limiting portion. When the engaging member is in the first position, the engaging member abuts against the first limiting portion. When the engaging member is in the second position, the engaging member abuts against the second limiting portion.

[0031] A vehicle comprising:

[0032] First vehicle body;

[0033] The second vehicle body is detachably mounted to the first vehicle body; and

[0034] The limiting mechanism described in any of the foregoing embodiments.

[0035] In one embodiment, the second vehicle body has an abutment portion, and when the engaging member is in the first position, the engaging member abuts against the abutment portion to restrict the second vehicle body to the first vehicle body; when the engaging member is in the second position, the engaging member moves away from the abutment portion to release the restriction of the second vehicle body on the first vehicle body.

[0036] The first vehicle body has a first joint portion, and the second vehicle body has a second joint portion. The second joint portion and the abutment portion are respectively located on the front and rear sides or left and right sides of the second vehicle body. The second joint portion is adapted to abut or engage with the first joint portion.

[0037] In one embodiment, the vehicle further includes a locking mechanism that can switch between a locked state and an unlocked state. When the locking mechanism is in the locked state, the second vehicle body is locked onto the first vehicle body; when the locking mechanism is in the unlocked state, the second vehicle body is released from the first vehicle body.

[0038] In one embodiment, the engaging mechanism includes:

[0039] The locking element is pivotally connected to the second vehicle body at a first pivot point and is switchable between a first locked position and a first unlocked position;

[0040] The locking member has a hook portion, and the first carrier body has a groove portion. When the locking member is in the first locking position, the hook portion engages with the groove portion. When the locking member is in the first unlocking position, the hook portion disengages from the groove portion.

[0041] In one embodiment, the engaging mechanism further includes:

[0042] A driving member is pivotally connected to the second carrier body at a second pivot point. One end of the driving member forms a pressing protrusion, and the other end of the driving member is driven to engage with the locking member. The second pivot point is located between the two ends of the driving member.

[0043] The first pivot point and the second pivot point are spaced apart, and the pressing protrusion is used to be pressed so that the driving member drives the locking member to switch to the first unlocking position.

[0044] In one embodiment, the engaging mechanism further includes: a pivot post at the other end of the driving member, a slotted groove in the locking member, the pivot post being inserted into the slotted groove and movable along the slotted groove.

[0045] In one embodiment, the locking member has a resilient arm for applying force to the locking member to move the locking member toward the first locking position.

[0046] Therefore, it is necessary to provide a trolley that is easy to operate and has high folding efficiency to address the above problems.

[0047] This application provides a stroller, comprising: a frame including at least three frame assemblies that engage with each other; a first locking mechanism disposed on the frame and capable of selectively locking the engagement position between two of the at least three frame assemblies; a second locking mechanism disposed on the frame and capable of selectively locking the engagement position between two of the at least three frame assemblies, wherein at least one of the frame assemblies locked by the second locking mechanism and the two frame assemblies locked by the first locking mechanism does not overlap; and an actuation mechanism disposed on the frame and drivingly cooperating with both the first locking mechanism and the second locking mechanism, wherein the actuation mechanism actuates to simultaneously release the first locking mechanism and the second locking mechanism.

[0048] In one embodiment, the frame assembly can be selected from any non-repeating combination of the following: handrail, footrest, armrest, seat frame, wheel frame, canopy frame, and storage basket frame.

[0049] In one embodiment, the frame includes a first frame assembly, a second frame assembly, and a third frame assembly that engage with each other; the first locking mechanism selectively locks the mating position between the first frame assembly and the second frame assembly; and the second locking mechanism selectively locks the mating position between the second frame assembly and the third frame assembly.

[0050] In one embodiment, the first locking mechanism and the second locking mechanism are independent of each other, and the actuation mechanism includes at least two actuation transmission mechanisms, which cooperate with the first locking mechanism and the second locking mechanism respectively. By actuating the actuation mechanism, the at least two actuation transmission mechanisms simultaneously release the first locking mechanism and the second locking mechanism respectively.

[0051] In one embodiment, the first locking mechanism and the second locking mechanism are connected to and driven to engage with each other, and the actuation mechanism includes at least one actuation transmission mechanism that engages with the first locking mechanism or the second locking mechanism. By actuating the actuation mechanism, the at least one actuation transmission mechanism simultaneously releases the first locking mechanism and the second locking mechanism.

[0052] In one embodiment, the trolley further includes a release mechanism disposed on the frame and driven to cooperate with the actuation mechanism, the release mechanism being operable to drive the actuation mechanism to move.

[0053] In one embodiment, the second frame assembly is a rider frame, the rider frame including an upper rider frame, a lower rider frame, and a first pivot joint disposed between the upper rider frame and the lower rider frame, the upper rider frame rotating about the first pivot joint relative to the lower rider frame.

[0054] In one embodiment, the actuation mechanism includes an actuation linkage mechanism and two actuation transmission mechanisms. Both actuation transmission mechanisms are connected to the actuation linkage mechanism. The actuation linkage mechanism passes through the first pivot joint and connects to the upper frame. The two actuation transmission mechanisms are respectively driven and engaged with the first locking mechanism and the second locking mechanism. When the upper frame rotates around the first pivot joint toward the lower frame, the actuation linkage mechanism bends around the first pivot joint to drive the two actuation transmission mechanisms to move synchronously, thereby simultaneously driving the first locking mechanism and the second locking mechanism to release.

[0055] In one embodiment, the first pivot joint includes a first connecting seat and a second connecting seat pivotally connected to each other. The first connecting seat is connected to the upper frame, and the second connecting seat is connected to the lower frame. The first connecting seat and / or the second connecting seat are provided with a guide portion, the guide portion having an arc-shaped peripheral wall. When the first connecting seat and the second connecting seat rotate to unfold relative to each other, the actuation linkage mechanism is tangent to the arc-shaped peripheral wall. When the first connecting seat rotates relative to the second connecting seat to fold relative to each other, the arc-shaped peripheral wall is adapted to guide the actuation linkage mechanism to bend.

[0056] In one embodiment, the actuation mechanism includes an actuation linkage mechanism and two actuation transmission mechanisms. Both actuation transmission mechanisms are connected to the actuation linkage mechanism, which is connected to the first pivot joint. The two actuation transmission mechanisms are respectively driven and engaged with the first locking mechanism and the second locking mechanism. When the upper frame rotates around the first pivot joint toward the lower frame, the actuation linkage mechanism bends around the first pivot joint to drive the two actuation transmission mechanisms to move synchronously, thereby simultaneously driving the first locking mechanism and the second locking mechanism to release.

[0057] In one embodiment, the first pivot joint includes: a first connecting seat for connecting the upper frame; a second connecting seat for connecting the lower frame; and a locking member axially movably disposed between the first connecting seat and the second connecting seat and having a locked position and an unlocked position. When the locking member is in the locked position, the first connecting seat and the second connecting seat are relatively fixed. When the locking member is in the unlocked position, the first connecting seat can rotate relative to the second connecting seat. The first connecting seat or the locking member has a fixing portion for connection with the actuation linkage mechanism.

[0058] In one embodiment, the two actuation transmission mechanisms and / or the actuation linkage mechanism are both traction components.

[0059] In one embodiment, the first frame assembly is a handrail frame, the second frame assembly is a handrail frame, and the third frame assembly is a footrest, with the footrest and the handrail frame respectively pivotally connected to the handrail frame; the first locking mechanism acts between the handrail frame and the handrail frame, and the second locking mechanism acts between the handrail frame and the footrest.

[0060] In one embodiment, the handrail has a folded position and an extended position; the first locking mechanism includes a first locking member and a locking recess, the first locking member being movably disposed on the handrail and connected to the actuation mechanism, and the handrail having the locking recess; when the first locking member is inserted into the locking recess, the handrail is restricted from rotating to the folded position, and when the first locking member is disengaged from the locking recess, the handrail is allowed to rotate to the folded position.

[0061] In one embodiment, the handrail is provided with a pusher portion, which has an arc-shaped structure. During the process of the handrail switching from the folded position to the unfolded position, the pusher portion guides the first locking member to insert into the locking recess.

[0062] In one embodiment, the trolley further includes a second pivot joint connected between the handframe and the footframe, the handframe being rotatable relative to the footframe about the second pivot joint; a second locking mechanism is movably disposed on the second pivot joint and has a locked state and an unlocked state; when the second locking mechanism is in the locked state, the handframe and the footframe are restricted from rotating relative to each other about the second pivot joint; when the second locking mechanism is in the unlocked state, the handframe and the footframe are allowed to rotate relative to each other about the second pivot joint.

[0063] In one embodiment, the second locking mechanism includes a locking component, a locking slot group, and a second drive member. The second pivot joint is provided with the locking slot group. The locking component is movably disposed within the second pivot joint and adapted to lock into the locking slot group to restrict the relative rotation of the rider frame and the footrest. The second drive member drives the locking component to lock into the locking slot group. The actuation mechanism is connected to the second drive member.

[0064] In one embodiment, the first frame assembly is a handrail, the second frame assembly is a handlebar, and the third frame assembly is a footrest. The footrest and the handrail are pivotally connected to the handlebar. The handrail has a locking recess, and the first locking mechanism includes a first locking member adapted to engage with the locking recess to restrict rotation of the handrail. The trolley also includes a second pivot joint connected between the handlebar and the footrest, and the handlebar is rotatable relative to the footrest about the second pivot joint. The second locking mechanism includes a mounting bracket adapted to engage with the second pivot joint to restrict relative rotation of the handlebar and the footrest. The mounting bracket is connected to the first locking member, and the actuation mechanism is connected to the mounting bracket and / or the first locking member.

[0065] In one embodiment, the frame includes a first frame assembly, a second frame assembly, a third frame assembly, and a fourth frame assembly that engage with each other; the first locking mechanism selectively locks the mating position between the first frame assembly and the second frame assembly; and the second locking mechanism selectively locks the mating position between the third frame assembly and the fourth frame assembly.

[0066] In one embodiment, the first frame assembly is an armrest frame, the second frame assembly is a seat frame, the third frame assembly is a footrest, and the fourth frame assembly is a handrail. The armrest frame is pivotally connected to the seat frame, the footrest is pivotally connected to the handrail, the first locking mechanism acts between the armrest and the seat frame, and the second locking mechanism acts between the footrest and the handrail.

[0067] Therefore, it is necessary to provide a stroller that has high safety and reliability in use to address the above problems.

[0068] This application provides a trolley, comprising: a frame including a seat frame, the frame having an unfolded state; an armrest frame pivotally connected to the frame, wherein when the frame is in the unfolded state, the armrest frame has a first open position and a second open position, and the first open position is closer to the seat frame than the second open position; and a stop mechanism disposed between the frame and the armrest frame, adapted to prevent the armrest frame from switching from the first open position to the second open position.

[0069] In one embodiment, the stopping mechanism includes: a first locking member disposed on the vehicle frame; and a locking member disposed on the handrail frame; when the handrail frame is in the first open position, the first locking member is located in the movement path of the handrail frame switching from the first open position to the second open position, and the first locking member and the locking member abut against each other in the movement direction of the handrail frame switching from the first open position to the second open position, so as to prevent the handrail frame from switching from the first open position to the second open position.

[0070] In one embodiment, one of the first locking member and the locking member includes an engaging protrusion and the other includes an engaging recess; when the handrail is in the first open position, the engaging protrusion extends into the engaging recess to abut against the side wall of the engaging recess in the direction of movement of the handrail switching from the first open position to the second open position.

[0071] In one embodiment, the first locking member includes an engaging protrusion, and the locking member includes an engaging recess; the first locking member is movably disposed on the vehicle frame and has a first position and a second position; when the first locking member is in the first position, the engaging protrusion extends into the engaging recess to abut against the side wall of the engaging recess, and the armrest is held in the first open position; when the first locking member is in the second position, the engaging protrusion retracts from the engaging recess.

[0072] In one embodiment, the first locking member is slidably disposed on the frame to have the first position and the second position.

[0073] In one embodiment, the armrest has a pivot end that is pivotally connected to the vehicle frame via a first pivot, the engaging recess is formed on the outer peripheral wall of the pivot end, and the sliding direction of the first locking member is perpendicular to the axial direction of the first pivot.

[0074] In one embodiment, the engaging recess has a first guide slope. When the armrest is in the first open position, the engaging protrusion abuts against the first guide slope. When the armrest switches from the first open position to the second open position, the engaging protrusion is adapted to slide along the first guide slope to exit the engaging recess.

[0075] In one embodiment, the frame also has a folded state, and the armrest also has a folded position. When the frame is in the folded state, the armrest is in the folded position, and the first open position is between the folded position and the second open position.

[0076] In one embodiment, the engaging recess has a second guide slope, and when the armrest is switched from the first open position to the folded position, the engaging protrusion is adapted to slide along the second guide slope to exit the engaging recess.

[0077] In one embodiment, the first locking member is pivotally connected to the frame to have the first position and the second position.

[0078] In one embodiment, the armrest has a pivot end, which is pivotally connected to the vehicle frame via a first pivot, and the engaging recess is provided at the pivot end; the first locking member is located on one side of the pivot end along the axial direction of the first pivot, and the engaging protrusion is adapted to extend into or retract from the engaging recess.

[0079] In one embodiment, the engaging recess is an arc-shaped hole, and the center of the arc-shaped hole is located at the first pivot.

[0080] In one embodiment, the frame also has a folded state, and the armrest also has a folded position. When the frame is in the folded state, the armrest is in the folded position. The first open position is between the folded position and the second open position. When the armrest switches between the first open position and the folded position, the first locking member is held in the first position and reciprocates within the arc-shaped hole.

[0081] In one embodiment, along the circumferential direction extending from the arc-shaped hole, one end of the arc-shaped hole passes through the pivot end to form an opening. When the handrail is in the folded position, the engaging protrusion is located at or moves from the opening to the outside of the pivot end. When the handrail is in the first open position, the engaging protrusion abuts against the hole wall of the arc-shaped hole away from the opening.

[0082] In one embodiment, the first locking member includes a release portion, a pivot portion, and the engaging protrusion connected in sequence. The pivot portion is pivotally connected to the frame. When the first locking member is in the first position, the release portion protrudes from the surface of the frame. When the first locking member is in the second position, the release portion does not protrude from the surface of the frame. The release portion is adapted to be operated to switch the first locking member from the first position to the second position.

[0083] In one embodiment, the stop mechanism further includes a first elastic element that provides an elastic restoring force to the first locking element to keep the first locking element in the first position.

[0084] In one embodiment, the armrest and the frame are pivotally connected by a first pivot, the first locking member includes an engaging protrusion and the engaging protrusion is elastic, the first locking member is fixed to the frame, the locking member is an engaging recess, the protruding direction of the engaging protrusion is parallel to the axial direction of the first pivot, and the engaging recess is offset from the first pivot in a direction parallel to the axial direction of the first pivot.

[0085] In one embodiment, the trolley further includes a locking mechanism disposed between the armrest and the frame, adapted to lock the armrest in the second open position.

[0086] In one embodiment, the locking mechanism includes a second locking member and a locking recess, the second locking member being movably disposed on the frame and the locking recess being disposed on the armrest frame. When the second locking member is inserted into the locking recess, the armrest frame is locked in the second open position, and when the second locking member is removed from the locking recess, the armrest frame is allowed to pivot to the first open position.

[0087] In one embodiment, the frame further has a folded state, and the armrest frame further has a folded position. When the frame is in the folded state, the armrest frame is in the folded position, and the first open position is between the folded position and the second open position. When the frame switches from the folded state to the unfolded state, the seat frame pushes against the armrest frame to switch the armrest frame from the folded position to the first open position. When the frame switches from the unfolded state to the folded state, the armrest frame switches from the second open position or the first open position to the folded position.

[0088] In one embodiment, the frame further includes a second pivot joint, a handrail, and a footrest. The seat frame, the footrest, and the handrail are pivotally connected via the second pivot joint to give the frame the folded state and the unfolded state. The armrest is pivotally connected to the second pivot joint or the handrail. When the frame switches from the folded state to the unfolded state, the seat frame, the footrest, and the handrail all pivot about the second pivot joint to move away from each other. When the frame switches from the unfolded state to the folded state, the seat frame, the footrest, and the handrail all pivot about the second pivot joint to move closer to each other.

[0089] In one embodiment, the handrail is pivotally connected to the second pivot joint. When the handrail is in the first open position, a seventh angle α7 is formed between the handrail and the vehicle frame; when the handrail is in the second open position, an eighth angle α8 is formed between the handrail and the vehicle frame; and when the handrail is in the folded position, a ninth angle α9 is formed between the handrail and the vehicle frame; wherein α9 > α7 > α8. Attached Figure Description

[0090] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0091] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0092] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0093] Figure 1 is a schematic diagram of the structure of the vehicle according to an embodiment of the first aspect of the present invention;

[0094] Figure 2 is an exploded view of the vehicle shown in Figure 1;

[0095] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0096] Figure 4 is a structural schematic diagram of the vehicle shown in Figure 1 from another perspective;

[0097] Figure 5 is a cross-sectional view of the vehicle shown in Figure 2 along line BB, at which point the engaging component is in the first position;

[0098] Figure 6 is a cross-sectional view of the vehicle shown in Figure 2 along line BB, at which point the engaging component is in the second position;

[0099] Figure 7 is a cross-sectional view of the vehicle shown in Figure 2 along line CC, at which point the engaging component is in the first position;

[0100] Figure 8 is an exploded view of a portion of the structure of the first vehicle body shown in Figure 2;

[0101] Figure 9 is a cross-sectional view of the vehicle shown in Figure 2 along line BB in another embodiment of the first aspect, at which time the engaging member is in the first position;

[0102] Figure 10 is a cross-sectional view of the vehicle shown in Figure 2 along line BB in another embodiment of the first aspect, where the engaging member is in the second position;

[0103] Figure 11 is a cross-sectional view of the vehicle shown in Figure 2 along line BB in another embodiment of the first aspect, at which time the engaging member is in the first position;

[0104] Figure 12 is a cross-sectional view of the vehicle shown in Figure 2 along line BB in another embodiment of the first aspect, at which time the engaging member is in the second position;

[0105] Figure 13 is a structural schematic diagram of a portion of the structure of the first carrier body and the limiting mechanism in another embodiment of the first aspect, at which time the engaging member is in the first position;

[0106] Figure 14 is a partial exploded view of some structures of the first vehicle body and limiting mechanism shown in Figure 13;

[0107] Figure 15 is a side view of a trolley in an embodiment of the second aspect of this application, wherein the frame is in an unfolded state;

[0108] Figure 16 is a side view of a trolley in an embodiment of the second aspect of this application, wherein the frame is in a transitional state between an unfolded state and a folded state.

[0109] Figure 17 is a side view of a trolley in an embodiment of the second aspect of this application, wherein the frame is in a folded state;

[0110] Figure 18 is an exploded view of the cart shown in Figure 15;

[0111] Figure 19 is a cross-sectional view of the cart shown in Figure 15;

[0112] Figure 20 is a cross-sectional view of the trolley shown in Figure 16, with the legs omitted.

[0113] Figure 21 is an enlarged view of circle A in Figure 20;

[0114] Figure 22 is a cross-sectional view of a trolley in another embodiment of the second aspect of this application, wherein the frame is in an unfolded state;

[0115] Figure 23 is a cross-sectional view of the trolley frame in another embodiment of the second aspect of this application, wherein the upper frame is rotated relative to the lower frame to fold up;

[0116] Figure 24 is a cross-sectional view of a trolley in another embodiment of the second aspect of this application, wherein the frame is in an unfolded state;

[0117] Figure 25 is an exploded view of the handframe in the trolley shown in Figure 15;

[0118] Figure 26 is an exploded view of the handframe in the trolley shown in Figure 15 from another perspective;

[0119] Figure 27 is an exploded view of the handrail and armrest of the trolley shown in Figure 15;

[0120] Figure 28 is an enlarged view of circle B in Figure 18;

[0121] Figure 29 is an enlarged view of circle C in Figure 18;

[0122] Figure 30 is a perspective view of the first fixed seat in the trolley shown in Figure 18;

[0123] Figure 31 is a cross-sectional view of the second pivot joint in the trolley shown in Figure 15;

[0124] Figure 32 is a cross-sectional view of the second pivot joint in the trolley shown in Figure 17;

[0125] Figure 33 is a perspective view of the trolley in the first embodiment of the third aspect of this application;

[0126] Figure 34 is a side view of the trolley shown in Figure 33, with the frame folded.

[0127] Figure 35 is a side view of the trolley shown in Figure 33, with the frame in the unfolded state and the armrest in the first open position;

[0128] Figure 36 is a side view of the trolley shown in Figure 33, with the frame in the unfolded state and the armrest in the second open position;

[0129] Figure 37 is a partial exploded view of the trolley shown in Figure 33, omitting the legs, seat frame, and part of the handrail.

[0130] Figure 38 is a cross-sectional view of the trolley shown in Figure 35, in which part of the legs and handlebars are omitted;

[0131] Figure 39 is a cross-sectional view of the trolley shown in Figure 36, in which some of the legs and handlebars are omitted;

[0132] Figure 40 is an enlarged schematic diagram of the structure of part D in Figure 39;

[0133] Figure 41 is a cross-sectional view of the trolley in the first embodiment of the third aspect of this application, wherein the frame is in a state between a folded state and an unfolded state;

[0134] Figure 42 is a perspective view of the trolley in the third embodiment of the third aspect of this application, wherein the frame is in an unfolded state and the armrest is in a first open position;

[0135] Figure 43 is a perspective view of the trolley in the third embodiment of the third aspect of this application, wherein the frame is in the unfolded state and the armrest is in the second open position;

[0136] Figure 44 is a side view of the cart shown in Figure 42;

[0137] Figure 45 is a side view of the cart shown in Figure 43;

[0138] Figure 46 is a cross-sectional view along line U1-U1 in Figure 44;

[0139] Figure 47 is a cross-sectional view along line U2-U2 in Figure 45;

[0140] Figure 48 is a partial exploded view of the trolley shown in Figure 42, omitting the legs, seat frame, and part of the handrail.

[0141] Figure 49 is a cross-sectional view of the trolley in the third embodiment of the third aspect of this application, wherein the frame is in a state between a folded state and an unfolded state;

[0142] Figure 50 is a cross-sectional view of the trolley shown in Figure 44, in which part of the legs and handlebars are omitted;

[0143] Figure 51 is a cross-sectional view of the trolley shown in Figure 45, with some of the legs and handlebars omitted.

[0144] Explanation of reference numerals in the attached drawings: A100, First vehicle body; A110, Handrail frame; A111, Arc-shaped rod; A111a, First joint; A1110, Groove; A112, Side rod; A120, Handrail frame; A121, Upper handrail; A122, Lower handrail; A123, Second pivot structure; A1231, First connecting seat; A1231a, First pivot joint; A1231b, First connecting part; A1232, Second connecting seat; A1232a, Second pivot joint; A1232b, Second connecting part; A1233, Third connecting seat; A1233a, Third pivot joint; A1233b, Third connecting part; A130, Front wheel frame; A140, Rear wheel frame; A150, Seat frame; A160, First pivot structure; A170, Canopy bracket; A200, Second vehicle body; A210, Basket body; A211, Backrest; A2110, Mounting cavity; A2111, First opening; A2112, Second opening; A2113, Second joint; A2113a, First joint surface; A2113b, Second joint surface; A212, Leg rest; A2121, Abutment; A220, Handle; A230, Third pivot structure; A230a, Support; A300, Engaging mechanism; A310. Drive component; A311, Pressing protrusion; A312, Pivot post; A320, Locking component; A321, First branch; A3210, Strip groove; A322, Second branch; A3221, Hook; A3222, Limiting protrusion; A323, Third branch; A323a, Elastic arm; A400, Limiting mechanism; A410, Fixed base; A411, Side; A412, Top; A413, Bottom; A414, Pivoting groove; A415, Engaging protrusion; A416, First limiting part; A417, Second limiting part; A418, Reinforcing rib; A419, Mounting hole; A420, Engaging component; A42 1. Operating surface; A422. Engaging surface; A4221. Engaging recess; A4221a. First engaging recess; A4221b. Second engaging recess; A4222. Clearance groove; A4222a. Pushing slope; A4223. First pushing protrusion; A4224. Second pushing protrusion; A423. Side wall; A4230. Mounting groove; A4231. Through hole; A430. Pivot shaft; A440. First reset component; A441. Loop ring; A442. First abutment part; A443. Second abutment part; A450. Locking pin; A451. Limiting groove; A452. Insertion surface; A460. Second reset component; M, Second pivot point; N, First pivot point; B10, Trolley; B100, Frame; B110, Handrail; B111, Upper handrail; B1111, Mounting seat; B112, Lower handrail; B113, First pivot joint; B1131, First connecting seat; B11311, First pivot part; B11312, First connecting part; B11313, First locking groove;B11314, Guide portion; B11315, Fixing portion; B1132, Second connecting seat; B11321, Second pivot portion; B11322, Second connecting portion; B11323, Second locking groove; B1133, Locking member; B11331, Driving portion; B1134, First driving member; B11341, Driving ramp; B1135, First resetting member; B114, Mounting bracket; B115, Second resetting member; B12 0. Leg; B121. Front leg; B122. Rear leg; B130. Armrest; B131. Pushing part; B132. Third reset part; B140. Seat frame; B150. Wheel frame; B200. First locking mechanism; B210. First locking element; B220. Locking recess; B300. Second locking mechanism; B310. Locking assembly; B311. Second locking element; B312. Third locking element; B3121. Locking Part; B3122, Main body; B313, Fourth locking member; B320, Locking groove group; B321, First locking groove; B322, Second locking groove; B323, Fourth locking groove; B330, Second driving member; B331, Abutting part; B400, Actuation mechanism; B410, Actuation transmission mechanism; B410a, First actuation transmission mechanism; B410b, Second actuation transmission mechanism; B420, Actuation linkage mechanism; B500 Second pivot joint; B510, first fixed seat; B511, pushing part; B512, first limiting post; B520, second fixed seat; B521, second limiting post; B522, movable groove; B530, third fixed seat; B531, third limiting post; B540, fourth fixed seat; B550, fourth reset component; B560, fifth reset component; B600, release mechanism; B610, release operation component; B620, linkage component; C10, trolley; C100, frame; C110, handrail; C111, upper handrail; C112, lower handrail; C113, first pivot joint; C120, leg support; C121, front leg support; C122, rear leg support; C130, seat frame; C140, second pivot joint; C141, first connecting seat; C1411, rotating seat; C1412, mounting seat; C14121, pivot part; C14121a, mounting cavity; C14121b, insertion port; C14121c, through hole; C14122, connecting part; C1 4122a, Cavity; C142, Second Connecting Seat; C143, Third Connecting Seat; C144, Fourth Connecting Seat; C151, Front Wheel; C152, Rear Wheel; C160, First Bracket; C200, Handrail Frame; C200a, Pivot End; C210, Handrail Bar; C220, Fixed Seat; C300, Stop Mechanism; C310, First Locking Member; C311, Pushing Inclined Surface; C312, Lock Release Part; C313, Pivot Part; C314, Engaging Protrusion; C320, Locking Member; C320a, Engaging Recess; C321, Groove;C3211, First guide slope; C3212, Second guide slope; C322, Arc-shaped hole; C3221, Opening; C3222, Second end; C330, First elastic element; C400, Fixed structure; C500, Locking mechanism; C510, Second locking element; C520, Locking recess; C540, Third elastic element; C600, Second elastic element; C700, First pivot; C800, Elastic pusher; C900, Second bracket; F1, First direction; W1, First steering; W2, Second steering; α1, First included angle; α2, Second included angle; α3, Third included angle; α4, Fourth included angle; α5, Fifth included angle; α7, Seventh included angle; α8, Eighth included angle; α9, Ninth included angle. Detailed Implementation

[0145] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0146] As shown in Figure 1, one embodiment of the first aspect of this application discloses a carrier, which includes a first carrier body A100, a second carrier body A200, and a locking mechanism A300 (see Figure 3) and a limiting mechanism A400 disposed between the two. In this embodiment, the first carrier body A100 may be, for example, a stroller, and the second carrier body A200 may be, for example, a baby carrier, but the present invention is not limited thereto. In other embodiments, the first carrier body A100 may also be a pet stroller, and the second carrier body A200 may be a pet carrier, etc.

[0147] As shown in Figures 1 and 2, the first vehicle body A100 includes a handrail frame A110, a handlebar frame A120, a front wheel frame A130, a rear wheel frame A140, and a seat frame A150. The handlebar frame A120, front wheel frame A130, rear wheel frame A140, and seat frame A150 are pivotally connected to a first pivot structure A160, and the handrail frame A110 is installed at the lower end of the handlebar frame A120. Optionally, there are two first pivot structures A160 arranged opposite to each other, with the left and right sides of the handlebar frame A120, the left and right sides of the front wheel frame A130, the left and right sides of the rear wheel frame A140, and the left and right sides of the seat frame A150 respectively pivotally connected to the two first pivot structures A160. The frame A120 includes an upper handlebar A121 and a lower handlebar A122. The upper handlebar A121 is a U-shaped bar, and there are two lower handlebars A122. The two ends of the upper handlebar A121 are pivotally connected to one end of the two lower handlebars A122 to the second pivot structure A123, and the other ends of the two lower handlebars A122 are pivotally connected to the two first pivot structures A160.

[0148] Please refer to Figure 4. The second pivot structure A123 includes a first connecting seat A1231 and a second connecting seat A1232 that are pivotally connected to each other. The first connecting seat A1231 includes a first pivot portion A1231a and a first connecting portion A1231b that are pivotally connected to each other. The second connecting seat A1232 includes a second pivot portion A1232a and a second connecting portion A1232b that are pivotally connected to each other. The first pivot portion A1231a and the second pivot portion A1232a are pivotally connected to each other. The first connecting portion A1231b is connected to one end of the upper hand lever A121, and the second connecting portion A1232b is connected to one end of one of the lower hand levers A122. This achieves the pivotal connection between the upper hand lever A121 and the lower hand lever A122. In this embodiment, the second pivot structure A123 further includes a third connecting seat A1233, which includes a third pivot portion A1233a and a third connecting portion A1233b. The third pivot portion A1233a is pivotally connected to the second pivot portion A1232a and the first pivot portion A1231a, and the third connecting portion A1233b is connected to the canopy bracket A170.

[0149] Furthermore, as shown in Figures 1 and 2, the handrail frame A110 is also a U-shaped rod, including an arc-shaped rod A111 and two side rods A112 connected to both ends of the arc-shaped rod A111. In this embodiment, the two side rods A112 are respectively fixed to the lower ends of the two alighting handrails A122, and the two ends of the arc-shaped rod A111 are detachably connected to the ends of the two side rods A112 away from the corresponding alighting handrails A122.

[0150] As shown in Figures 1 and 2, the second carrier body A200 includes a basket body A210 and handles A220 pivotally connected to both sides of the basket body A210. In this embodiment, the handles A220 are also U-shaped rod structures, and both ends of the handles A220 are pivotally connected to both sides of the basket body A210 via two third pivot structures A230. The basket body A210 includes a backrest A211 and a leg rest A212 arranged at a certain angle to each other.

[0151] In some embodiments, the basket body A210 can be mounted on the first carrier body A100 by abutting or engaging with each other. Optionally, the first carrier body A100 may be provided with a first joint A111a, and the second carrier body A200 (such as the basket body A210) may be provided with a second joint A2113, the second joint A2113 being adapted to abut or engage with the first joint A111a. For example, as shown in FIG2, the first joint A111a may be the arc-shaped rod A111 of the armrest frame A110. The bottom of the backrest portion A211 of the basket body A210 may form an inverted L-shaped second joint A2113. The second joint A2113 may specifically include a first joint surface A2113a and a second joint surface A2113b that are interconnected. When the second carrier body A200 is placed on the ground, the first joint surface A2113a is approximately parallel to the horizontal plane, and the second joint surface A2113b is approximately perpendicular to the horizontal plane. Thus, when the basket body A210 is mounted on the first carrier body A100, the arc-shaped rod A111 engages at the junction of the first mating surface A2113a and the second mating surface A2113b, that is, the first mating surface A2113a abuts against the upper side of the arc-shaped rod A111, and the second mating surface A2113b abuts against the rear side of the arc-shaped rod A111. In an embodiment not shown, the second mating portion A2113 may, for example, be a mating groove that engages with the arc-shaped rod A111.

[0152] In this embodiment, the backrest portion A211 of the basket body A210 is engaged with the arc-shaped rod A111 of the armrest frame A110 via an engaging mechanism A300. Furthermore, the engaging mechanism A300 is switchable between a locked state and an unlocked state. When the engaging mechanism A300 is in the locked state, the second carrier body A200 is engaged with the first carrier body A100; when the engaging mechanism A300 is in the unlocked state, the second carrier body A200 is released from the first carrier body A100. Optionally, as shown in FIG3, the engaging mechanism A300 includes a driving member A310 and a locking member A320. The backrest portion A211 of the basket body A210 is provided with a mounting cavity A2110, and the driving member A310 and the locking member A320 are at least partially disposed within this mounting cavity A2110. In this embodiment, the driving member A310 is generally elongated. The driving member A310 is pivotally connected to the cavity wall of the mounting cavity A2110 at a second pivot point M, approximately at its center. One end of the driving member A310 forms a pressing protrusion A311 for pressing. The backing portion A211 has a first opening A2111 communicating with the mounting cavity A2110. The pressing protrusion A311 is exposed through the first opening A2111 for operation. The other end of the driving member A310 has a pivot post A312, meaning the second pivot point M is located between the pressing protrusion A311 and the pivot post A312.

[0153] The locking component A320 is generally Y-shaped, including a first branch A321, a second branch A322, and a third branch A323, with one end of each branch connected to a center point. The center point of the locking component A320 is pivotally connected to the cavity wall of the mounting cavity A2110 at a first pivot point N, which is spaced apart from the second pivot point M. In this embodiment, the first pivot point N is approximately located below the second pivot point M. The other end of the first branch A321 has a strip groove A3210, and a pivot post A312 is inserted into the strip groove A3210 and slides along it. The other end of the second branch A322 forms a hook portion A3221, and the arc-shaped rod A111 of the handrail frame A110 forms a groove portion A1110. The backrest portion A211 also has a second opening A2112 communicating with the mounting cavity A2110. The hook portion A3221 can extend out of the mounting cavity A2110 through the second opening A2112 to engage with the groove portion A1110. The locking member A320 is rotatable between a first locked position and a first unlocked position. When the locking member A320 is in the first locked position, it can extend out of the mounting cavity A2110 through the second opening A2112 to engage with the groove portion A1110; when the locking member A320 is in the first unlocked position, it can extend into the mounting cavity A2110 through the second opening A2112 to disengage from the groove portion A1110. The other end of the second branch A322, facing away from the hook portion A3221, also forms a limiting protrusion A3222, which abuts against the edge of the second opening A2112 to limit the rotational stroke of the locking member A320. The third branch A323 forms an elastic arm A323a, which abuts against the cavity wall of the mounting cavity A2110 to apply a force to the locking member A320 to rotate toward the first locking position.

[0154] The working principle of the A300 locking mechanism is described in detail below:

[0155] As shown in Figure 3, when it is necessary to detach the second vehicle body A200 from the first vehicle body A100, the protrusion A311 can be pressed, causing the driving member A310 to rotate clockwise around the second pivot point M (i.e., the R1 direction in Figure 3). Simultaneously, the driving member A310, through the engagement of the pivot pin A312 and the slot A3210, drives the locking member A320 to rotate counterclockwise around the first pivot point N (i.e., the R2 direction in Figure 3). During this rotation, the elastic arm A323a deforms, increasing the distance between the pivot pin A312 and the first pivot point N. Therefore, the pivot pin A312 simultaneously slides along the slot A3210 away from the first pivot point N. When the locking member A320 rotates from the first locked position to the first unlocked position, the hook A3221 and the slot A1110 disengage, and the second vehicle body A200 can be detached from the first vehicle body A100.

[0156] When the second vehicle body A200 needs to be installed onto the first vehicle body A100, the protrusion A311 can be pressed, causing the driving member A310 to rotate clockwise around the second pivot point M (i.e., the R1 direction in Figure 3). Simultaneously, the driving member A310, through the cooperation of the pivot post A312 and the slot A3210, drives the locking member A320 to rotate counterclockwise around the first pivot point N (i.e., the R2 direction in Figure 3). During this rotation, the elastic arm A323a deforms, increasing the distance between the pivot post A312 and the first pivot point N. Therefore, the pivot post A312 simultaneously slides along the slot A3210 away from the first pivot point N. When the locking member A320 rotates from the first locked position to the first unlocked position, the hook A3221 retracts into the mounting cavity A2110 through the second opening A2112 to avoid the handrail A110 of the first vehicle body A100. At this point, the second vehicle body A200 can be placed on the first vehicle body A100, with the backrest A211 of the second vehicle body A200 abutting against the handrail A110 of the first vehicle body A100. The pressing protrusion A311 can then be released, and the locking member A320, under the elastic restoring force of the elastic arm A323a, rotates around the first pivot point N in the opposite direction of R2 to the first locked position. The hook A3221 extends through the second opening A2112 into the mounting cavity A2110 and engages with the groove A1110 on the arc-shaped rod A111. Thus, the installation of the second vehicle body A200 on the first vehicle body A100 is achieved.

[0157] Further, as shown in Figure 1, the two third pivot structures A230 of the second vehicle body A200 are provided with support portions A230a. When the second vehicle body A200 is installed on the first vehicle body A100, the two support portions A230a press against the upper part of the approximate middle of the two lower handlebars A122, that is, the handlebars A120 limit the second vehicle body A200 in the downward direction. In this embodiment, the third pivot structure A230 itself directly forms the support portion A230a, and the third pivot structure A230 directly abuts against the lower handlebars A122 to form a downward limit. In other embodiments, for example, if the width of the basket body A210 is large, when the second carrier body A200 is installed on the first carrier body A100, the two third pivot structures A230 are located on the outside of the opposite side of the lower handle bar A122 (i.e., the side away from the basket body A210), and the two third pivot structures A230 cannot abut against the opposite side of the lower handle bar A122. In this case, additional support parts A230a can be provided on the inside of the two third pivot structures A230 (i.e., the side facing the basket body A210), so that the two support parts A230a can abut against the opposite side of the lower handle bar A122. Similarly, if the width of the basket body A210 is small, when the second vehicle body A200 is installed on the first vehicle body A100, the two third pivot structures A230 are located inside the lower handle bar A122 on the opposite side (i.e., the side facing the basket body 210). The two third pivot structures A230 cannot abut against the lower handle bar A122 on the opposite side. In this case, additional support parts A230a can be provided on the outside of the two third pivot structures A230 (i.e., the side away from the basket body A210) so that the two support parts A230a can abut against the lower handle bar A122 on the opposite side.

[0158] Further, as shown in Figures 1 and 4, a limiting mechanism A400 is provided between the second carrier body A200 and the first carrier body A100, so that the first carrier body A100 limits the second carrier body A200 in the upward direction. Optionally, the limiting mechanism A400 includes a fixed base A410, a locking member A420, a pivot shaft A430, a first reset member A440 (see Figure 7), and a stop portion A2121. The fixed base A410 is used to fix it to the first carrier body A100. The locking member A420 is rotatably disposed on the fixed base A410 and can be switched between a first position and a second position. The engaging member A420 can be held in a first position or a second position relative to the fixed base A410 by engaging with the fixed base A410. When the engaging member A420 is in the first position, the engaging member A420 can restrict the second vehicle body A200 onto the first vehicle body A100. When the engaging member A420 is in the second position, the engaging member A420 releases the restriction of the second vehicle body A200 onto the first vehicle body A100.

[0159] Optionally, as shown in Figures 1 and 4, there are two limiting mechanisms A400, which are respectively disposed between the two sides of the leg rest A212 of the second vehicle body A200 and the two sides of the handframe A120. The structure and connection relationship of one of the second limiting mechanisms A400 are described in detail below using it as an example: The fixing seat A410 is roughly a square box structure, and the fixing seat A410 is fixed to the first connecting part A1231b of the first connecting seat A1231. In this embodiment, the fixing seat A410 and the first connecting seat A1231 are integrally formed. Of course, in other embodiments, the fixing seat A410 and the first connecting seat A1231 can also be two independent components connected by, for example, fasteners. Optionally, the fixing seat A410 includes a side A411 and a top A412 and a bottom A413 connected to the upper and lower sides of the side A411. One side of each of the side portion A411, top portion A412, and bottom portion A413 is connected to the first connecting portion A1231b, such that the side portion A411, top portion A412, bottom portion A413, and first connecting portion A1231b enclose a pivot groove A414. A reinforcing rib A418 is also provided between the side portion A411 and the first connecting portion A1231b to improve the structural strength of the fixing base A410. The engaging member A420 is generally a long, strip-shaped block structure. A portion of the engaging member A420 is located within the pivot groove A414 and is pivotally connected to the top portion A412 and bottom portion A413 of the fixing base A410 via a pivot shaft A430. In this embodiment, the pivot shaft A430 is generally perpendicular to the top portion A412 and the bottom portion A413. The other portion of the engaging member A420 is located outside the pivot groove A414 for abutting against the second carrier body A200. The engaging component A420 has an arc-shaped operating surface A421 at one end outside the pivot groove A414. The operating surface A421 is covered with a soft material such as thermoplastic elastomer (TPE), which can improve the user's operating comfort.

[0160] Furthermore, one of the fixing base A410 and the engaging member A420 is provided with an engaging protrusion A415, and the other of the fixing base A410 and the engaging member A420 is provided with an engaging recess A4221 that can cooperate with the engaging protrusion A415. When the engaging member A420 is in the first position or the second position, the engaging protrusion A415 and the engaging recess A4221 are engaged.

[0161] In this embodiment, as shown in Figures 5 and 6, the fixing base A410 is provided with a locking protrusion A415, and the locking member A420 is provided with a locking recess A4221 that can engage with the locking protrusion A415. Optionally, the locking protrusion A415 is generally located at the connection between the side portion A411 and the first connecting portion A1231b. One end of the locking member A420 located in the pivot groove A414 forms an arc-shaped locking surface A422 that is spaced apart from the pivot shaft A430, that is, the pivot shaft A430 does not pass through the locking surface A422. The locking surface A422 has a first locking recess A4221a and a second locking recess A4221b that are spaced apart along its circumference. The locking surface A422 is also provided with a clearance groove A4222, which is located between the first locking recess A4221a and the second locking recess A4221b. In other words, a first pushing protrusion A4223 is formed between the first engaging recess A4221a and the clearance groove A4222, and a second pushing protrusion A4224 is formed between the second engaging recess A4221b and the clearance groove A4222. Pushing inclined surfaces A4222a are formed at both ends of the clearance groove A4222 along the circumferential direction of the engaging surface A4222, and these inclined surfaces A4222a are used to abut against the engaging protrusion A415. As shown in Figure 5, when the engaging member A420 is in the first position, the engaging protrusion A415 and the first engaging recess A4221a are engaged. As shown in Figure 6, when the engaging member A420 is in the second position, the engaging protrusion A415 and the second engaging recess A4221b are engaged. In an embodiment not shown, the configuration can also be reversed, i.e., the engaging protrusion A415 includes a first engaging protrusion and a second engaging protrusion, while the engaging recess A4221 is configured as one. When the engaging member A420 is in the first position, the first engaging protrusion engages with the engaging recess A4221; when the engaging member A420 is in the second position, the second engaging protrusion engages with the engaging recess A4221.

[0162] Further, as shown in Figures 5 and 6, the fixing base A410 has a first limiting portion A416 and a second limiting portion A417. When the engaging member A420 is in the first position, the engaging member A420 abuts against the first limiting portion A416; when the engaging member A420 is in the second position, the engaging member A420 abuts against the second limiting portion A417. In this embodiment, the side portion A411 of the fixing base A410 forms the first limiting portion A416, and the first connecting portion A1231b forms the second limiting portion A417. The provision of the first limiting portion A416 and the second limiting portion A417 can limit the pivot angle of the engaging member A420.

[0163] Further, as shown in Figures 7 and 8, the first reset member A440 is disposed between the fixed base A410 and the engaging member A420. In this embodiment, the first reset member A440 is a torsion spring, which includes two opposing sleeve rings A441 and a first abutment portion A442 connecting the two sleeve rings A441. Each of the two sleeve rings A441 has a second abutment portion A443 extending away from the first abutment portion A442. The two sleeve rings A441 are sleeved on the pivot shaft A430, and the first abutment portion A442 abuts against the first connecting portion A1231b, while the second abutment portion A443 abuts against the engaging member A420. Optionally, mounting grooves A4230 can be formed on the opposite side walls A423 of the engaging member A420. The two mounting grooves A4230 are arranged opposite to each other, and the bottoms of the two mounting grooves A4230 are connected to form a through hole A4231 for the pivot shaft A430 to pass through. Thus, two sleeve rings A441 are respectively disposed in the two mounting grooves A4230 and sleeved on the pivot shaft A430, and two second abutting portions A443 abut against the groove walls of the two mounting grooves A4230 respectively. The first reset member A440 is used to apply force to the engaging member A420 to rotate the engaging member A420 to a first position or a second position. In this embodiment, the first reset member A440 is used to apply force to the engaging member A420 to rotate the engaging member A420 to the first position.

[0164] Further, as shown in Figures 2 and 4, the second carrier body A200 has an abutment portion A2121. In this embodiment, the abutment portion A2121 is disposed at the edge of the leg rest portion A212 of the basket body A210. Of course, in other embodiments, the abutment portion A2121 may also be formed directly from a portion of the leg rest portion A212 without the need for additional components. When the engaging member A420 is in the first position, the engaging member A420 abuts against the abutment portion A2121 to restrict the second carrier body A200 onto the first carrier body A100; when the engaging member A420 is in the second position, the engaging member A420 moves away from the abutment portion A2121 to release the restriction of the second carrier body A200 onto the first carrier body A100.

[0165] Thus, in the embodiment where the first vehicle body A100 and the second vehicle body A200 are connected via the first joint A111a and the second joint A2113, the backrest portion A211 of the second vehicle body A200 abuts or engages with the first joint A111a via the second joint A2113, and the leg rest portion A212 of the second vehicle body A200 is restricted to the first vehicle body A100 by the abutment of the limiting mechanism A400 and the abutment portion A2121. This restricts the front and rear sides of the second vehicle body A200 to the first vehicle body A100, thereby ensuring that the second vehicle body A200 is securely mounted on the first vehicle body A100. Of course, in other embodiments, the second joint A2113 and the abutment portion A2121 may also be located on the left and right sides of the second vehicle body A200, respectively.

[0166] In the embodiment where the first vehicle body A100 and the second vehicle body A200 are connected by a locking mechanism A300, the locking mechanism A300 and the abutment portion A2121 are also located on the front and rear sides of the second vehicle body A200, respectively, thereby ensuring that the second vehicle body A200 is securely mounted on the first vehicle body A100. Of course, in other embodiments, the locking mechanism A300 and the abutment portion A2121 may also be located on the left and right sides of the second vehicle body A200, respectively.

[0167] The working principle of the limit mechanism A400 is described in detail below:

[0168] When the second vehicle body A200 needs to be installed on the first vehicle body A100, as shown in Figure 5, the engaging member A420 can be rotated clockwise (i.e., in the R3 direction in Figure 5) so that the engaging protrusion A415 rotates out of the first engaging recess A4221a, passes over the first pushing protrusion A4223, and enters the clearance groove A4222. Continuing to rotate the engaging member A420 causes the engaging protrusion A415 to abut against the pushing inclined surface A4222a near the second engaging recess A4221b in the clearance groove A4222. Further rotation of the engaging member A420 then guides the engaging protrusion A415 past the second pushing protrusion A4224 and into the second engaging recess A4221b. The design of the jacking ramp A4222a makes the process of engaging the engaging protrusion A415 into the second engaging recess A4221b easier. As shown in Figure 6, the engaging member A420 is in the second position, abutting against the second limiting part A417, and the first reset member A440 deforms. The engaging member A420 is essentially folded towards the first connecting seat A1231, which will not interfere with the installation of the second vehicle body A200 on the first vehicle body A100. At this time, the second vehicle body A200 can be installed on the first vehicle body A100, and the engaging mechanism A300 described above engages the second vehicle body A200 on the first vehicle body A100, while the support part A230a of the second vehicle body A200 abuts against the lowering handle A122. At this point, the engaging component A420 can be rotated counterclockwise (i.e., in the R4 direction in Figure 6), causing the engaging protrusion A415 to rotate out of the second engaging recess A4221b, pass over the second pushing protrusion A4224, and enter the clearance groove A4222. Continuing to rotate the engaging component A420, the engaging protrusion A415 abuts against the pushing inclined surface A4222a near the first engaging recess A4221a in the clearance groove A4222. Further rotation of the engaging component A420 causes the engaging protrusion A415, guided by the pushing inclined surface A4222a and aided by the elastic restoring force of the first reset component A440, to pass over the first pushing protrusion A4223 and enter the first engaging recess A4221a. As shown in Figure 5, the engaging component A420 is in the first position, abutting against the first limiting part A416. The portion of the engaging component A420 outside the pivot groove A414 abuts against the abutting part A2121 of the second carrier body A200. This achieves the installation of the second carrier body A200 onto the first carrier body A100. The process of removing the second carrier body A200 from the first carrier body A100 is the reverse of the installation process and will not be described further here.

[0169] In another embodiment of the first aspect, the first engaging recess A4221a or the second engaging recess A4221b may also be omitted. For example, in the embodiments shown in Figures 9 and 10, the first engaging recess A4221a is omitted. The engaging member A420 is held in the first position by the elastic force of the first reset member A440 and the limiting effect of the first limiting part A416, and the engaging member A420 is held in the second position by the engagement of the engaging protrusion A415 and the second engaging recess A4221b. When the engaging member A420 switches from the first position to the second position, it is also rotated clockwise (i.e., in the R3 direction in Figure 9) so that the engaging member A420 passes the second pushing protrusion A4224 and enters the second engaging recess A4221b, at which time the first reset member A440 undergoes elastic deformation. When the engaging component A420 switches from the second position to the first position, it is rotated counterclockwise (i.e., in the R4 direction in Figure 10) so that after passing the second push protrusion A4224, the engaging component A420 returns to the first position under the elastic deformation force of the first reset component A440. In this embodiment, the position switching process of the engaging component A420 only requires passing one push protrusion, which is more time-saving and labor-saving compared to the previous embodiment where two push protrusions need to be passed.

[0170] In another embodiment of the first aspect, the first engaging recess A4221a or the second engaging recess A4221b may be omitted. For example, in the embodiment shown in Figures 11 and 12, the first engaging recess A4221a is omitted. That is, the limiting mechanism A400 only includes the second engaging recess A4221b (hereinafter referred to as engaging recess A4221). The engaging member A420 is held in the first position by the elastic force of the first reset member A440 and the limiting effect of the first limiting part A416. The limiting mechanism A400 further includes a locking pin A450. The engaging member A420 is held in the second position by the engagement of the locking pin A450 and the engaging recess A4221. Optionally, the locking pin A450 is movably disposed on the fixed base A410 and can be switched between the second locking position and the second unlocking position. In this embodiment, the fixed base A410 is provided with a mounting hole A419, which is a blind hole. Optionally, the mounting hole A419 may be generally located at the junction of the first limiting portion A416 and the second limiting portion A417, and the extending direction of the mounting hole A419 is generally along the radial direction of the arc-shaped engaging surface A422. The locking pin A450 is at least partially located within the mounting hole A419 and is movable along the extending direction of the mounting hole A419. When the engaging member A420 is in the second position, the locking pin A450 is opposite to the engaging recess A4221. When the locking pin A450 is in the second locked position, the locking pin A450 is engaged with the engaging recess A4221; when the locking pin A450 is in the second unlocked position, the locking pin A450 is disengaged from the engaging recess A4221. The limiting mechanism A400 further includes a second reset member A460, which is adapted to apply force to the locking pin A450 to switch it to the second locked position. In this embodiment, the second reset member A460 is a spring. The second reset member A460 is disposed within the mounting hole A419. One end of the second reset member A460 abuts against the bottom wall of the mounting hole A419, and the other end abuts against the locking pin A450. Optionally, the locking pin A450 has a limiting groove A451 at the end opposite to the bottom wall of the mounting hole A419, one end of the second reset member A460 abuts against the bottom wall of the mounting hole A419, and the other end of the second reset member A460 is inserted into the limiting groove A451 and abuts against the bottom of the limiting groove A451. The locking pin A450 is adapted to be pushed by the engaging member A420 to move to the second unlocking position. Optionally, the locking pin A450 is adapted to be pushed by the arc-shaped engaging surface A422 of the engaging member A420 to move to the second unlocking position. The locking pin 450 has an arc-shaped insertion surface A452 at the end for insertion into the engaging recess 4221. The arc-shaped insertion surface A452 not only matches the arc-shaped engagement surface A422 of the engagement recess A4221, but also guides the engagement member A420 from the second position to the first position, so that the locking pin A450 can be rotated out of the engagement recess A4221 with less effort.

[0171] When the engaging member A420 switches from the first position to the second position, it is rotated clockwise (i.e., in the R3 direction in Figure 11), causing the locking pin A450 to align with the engaging recess A4221. At this time, the first reset member A440 undergoes elastic deformation, and the locking pin A450, losing the pushing force of the engaging surface A422, moves to the second locking position under the elastic restoring force of the second reset member A460. The locking pin A450 engages with the engaging recess A4221 to hold the engaging member A420 in the second position. When the engaging member A420 switches from the second position to the first position, it is rotated counterclockwise (i.e., in the R4 direction in Figure 12), causing the locking pin A450 to move out of the engaging recess A4221. The locking pin A450 is again pushed by the engaging surface A422 and moves to the second unlocking position, while the second reset member A460 is compressed and deformed. After losing the locking effect of locking pin A450 and engaging recess A4221, engaging member A420 rotates to the first position under the elastic restoring force of first reset member A440.

[0172] Of course, in other embodiments, the positions of the locking pin A450 and the engaging recess A4221 can also be interchanged, that is, the locking pin A450 can be provided on the engaging member A420, and the engaging recess A4221 can be provided on the fixing seat A410.

[0173] The limiting mechanism A400 and the carrier proposed in this invention have at least the following technical effects:

[0174] In the aforementioned limiting mechanism A400, the fixed base A410 is fixed to the first vehicle body A100, and the engaging member A420 is rotatably mounted on the fixed base A410. The engaging member A420, through its engaging engagement with the fixed base A410, can maintain itself in either a first or a second position relative to the fixed base A410. By switching the position of the engaging member A420 mounted on the fixed base A410 between the first and second positions, the limiting of the second vehicle body A200 relative to the first vehicle body A100 can be selectively achieved. This limiting mechanism A400 has a simple overall structure, is easy to operate, and does not affect the overall appearance of the vehicle.

[0175] A second aspect of this application provides a trolley B10 that can simultaneously release at least two locking mechanisms disposed on a frame B100 by a single braking force. The trolley B10 structure includes a frame B100, a first locking mechanism B200, a second locking mechanism B300, and an actuation mechanism B400. The frame B100 includes at least three frame assemblies. The first locking mechanism B200 is disposed on the frame B100 and is capable of selectively locking the mating positions of two of the at least three frame assemblies. The second locking mechanism B300 is disposed on the frame B100 and is capable of selectively locking the mating positions of two of the at least three frame assemblies, wherein at least one of the two frame assemblies locked by the second locking mechanism B300 and the two frame assemblies locked by the first locking mechanism B200 is not overlapping. The actuation mechanism B400 is located on the frame B100, and the actuation mechanism B400 is simultaneously driven and cooperated with the first locking mechanism B200 and the second locking mechanism B300. The actuation mechanism B400 is activated so that the first locking mechanism B200 and the second locking mechanism B300 are simultaneously unlocked.

[0176] The trolley B10 provided in this application has a frame assembly B100 that can be selected from at least three of the following: handrail B110, footrest B120, armrest B130, seat frame B140, wheel frame B150, canopy frame, and storage basket frame, but is not limited thereto. Any frame assembly that can be installed on the frame B100 to substantially benefit the function of the trolley B10 should be considered to be within the scope of this specification.

[0177] The stroller B10 provided by this invention has a generally symmetrical structure. The stroller B10 can be used as a children's stroller, a pet stroller, or a cargo stroller, etc. Correspondingly, the frame B100 can serve as the frame B100 of a children's stroller, a pet stroller, or a cargo stroller. The following description uses the stroller B10 as a children's stroller to illustrate its structure and working principle.

[0178] In one embodiment, the trolley B10 structure includes a frame B100, a first locking mechanism B200, a second locking mechanism B300, and an actuation mechanism B400. The frame B100 includes a first frame assembly, a second frame assembly, and a third frame assembly. The first locking mechanism B200 is disposed on the frame B100 and can selectively lock the mating positions of the first frame assembly and the second frame assembly. The second locking mechanism B300 is disposed on the frame B100 and can selectively lock the mating positions of the second frame assembly and the third frame assembly. The actuation mechanism B400 is disposed on the frame B100 and simultaneously engages with both the first locking mechanism B200 and the second locking mechanism B300, causing the first locking mechanism B200 and the second locking mechanism B300 to release simultaneously.

[0179] Please refer to Figures 19 and 20, which provide cross-sectional views of the trolley B10 in one embodiment of the present invention. In Figure 19, the first locking mechanism B200 and the second locking mechanism B300 are in the locked position, and in Figure 20, the first locking mechanism B200 and the second locking mechanism B300 are in the unlocked position.

[0180] In this embodiment, the first frame assembly may be, for example, a handlebar frame B130, the second frame assembly may be, for example, a handrail frame B110, and the third frame assembly may be, for example, a footrest B120. In this embodiment, since the trolley B10 has a symmetrical structure, the following description will primarily use one side as an example, explaining the overall structure of the frame B100 while also describing the structure and / or placement of the handrail frame B110, footrest B120, and handlebar frame B130 one by one.

[0181] As shown in Figure 19, both the handrail B130 and the footrest B120 are pivotally connected to the handlebar B110. The handrail B130 is pivotally connected to the handlebar B110 via a first pivot, and the footrest B120 is pivotally connected to the handlebar B110 via a second pivot, wherein the first pivot is offset from the second pivot. When the handrail B130 is pivotally connected to the handlebar B110, a first locking mechanism B200 acts between the handrail B130 and the handlebar B110, selectively locking the mating position between them. For example, the first locking mechanism B200 is adapted to lock the handrail B130 and the handlebar B110 in a relatively unfolded position, at which point the handrail B130 is restricted from rotating relative to the handlebar B110 to fold. In other words, the first locking mechanism B200 is adapted to lock the handrail B130 in the extended position to restrict the handrail B130 from switching from the extended position to the folded position. The second locking mechanism B300 acts between the handrail B110 and the footrest B120, and can selectively lock the mating position between the handrail B110 and the footrest B120. For example, the second locking mechanism B300 is adapted to lock the handrail B110 and the footrest B120 in a relatively extended position, at which point the handrail B110 is restricted from rotating relative to the footrest B120 to fold. The actuation mechanism B400 includes at least two actuation transmission mechanisms B410, which respectively cooperate with the first locking mechanism B200 and the second locking mechanism B300. As shown in Figure 20, when the actuation mechanism B400 is activated, the actuation mechanism B400 drives the first locking mechanism B200 and the second locking mechanism B300 to release simultaneously. This allows the handrail B130 to rotate relative to the rider frame B110 to switch to the folded position, and at the same time, it allows the rider frame B110 to rotate relative to the footrest B120 to fold.

[0182] The trolley B10 provided in this application, with its first locking mechanism B200 and second locking mechanism B300 located on the frame B100, can be a single locking structure composed of a locking element and a locked element adapted together, or a composite locking structure composed of other cooperating components in addition to the locking element and the locked element. The locking structures of the first locking mechanism B200 and the second locking mechanism B300 can be freely configured according to different needs such as the specific locking position, the internal space capacity of the frame B100, or the need to avoid other necessary functional components, and should not be subject to any restrictions. That is, the first locking mechanism B200 can also be a composite locking structure composed of other cooperating components (such as transmission components) in addition to the locking element and the locked element, and the second locking mechanism B300 can also be a single locking structure composed of a locking element and a locked element adapted together.

[0183] Please refer again to Figures 19 and 20. In one embodiment, the first locking mechanism B200 may be a single locking structure composed of a locking member and a locked member adapted together. This can be understood as the first locking mechanism B200 including a locking member and a locked member. Specifically, in one embodiment, the handrail B130 is pivotally connected to the bicycle frame B110. The first locking mechanism B200 may include, for example, a first locking member B210 (i.e., the locking member) and a locking recess B220 (i.e., the locked member). The locking recess B220 is disposed on the handrail B130, and the first locking member B210 is movably disposed on the bicycle frame B110 and adapted to be inserted into or retracted from the locking recess B220. When the first locking member B210 is inserted into the locking recess B220, the handrail B130 is locked to restrict rotation about a first pivot. When the first locking member B210 disengages from the locking recess B220, the handrail B130 is released, allowing it to rotate about the first pivot. Optionally, the first locking member B210 is connected to one of the actuation mechanisms B410 (such as the first actuation mechanism B410a), which is actuated by the actuation mechanism B400 to drive the first locking member B210 to move within the handrail B110. When the first locking mechanism B200 releases, the handrail B130 can rotate relative to the handrail B110.

[0184] Please refer to Figures 18, 28 and 29. Figure 18 shows an exploded view of the second locking mechanism B300 and the second pivot joint B500 in an embodiment of the second aspect of the present invention. Figures 28 and 29 show detailed structural diagrams of the second locking mechanism B300 and the second pivot joint B500 in an embodiment of the second aspect of the present invention.

[0185] In one embodiment, the second locking mechanism B300 may be a composite locking structure consisting of a locking element and a locked element adapted together. In other words, the second locking mechanism B300 may also include a locking element, a locked element, and a cooperating component. Optionally, as shown in Figures 19 and 20, the second locking mechanism B300 is movably disposed on the second pivot joint B500 and has a locked state and an unlocked state. When the second locking mechanism B300 is in the locked state, the rider frame B110 and the footrest B120 are both restricted from rotating relative to each other about the second pivot joint B500. When the second locking mechanism B300 is in the unlocked state, the rider frame B110 and the footrest B120 are both allowed to rotate relative to each other about the second pivot joint B500. Further, as shown in Figures 18, 28, and 29, the second locking mechanism B300 may include a locking component B310 (exemplarily a locking element), a locking groove group B320 (exemplarily a locked element), and a second drive member B330 (exemplarily a cooperating component). The second pivot joint B500 is provided with a locking groove group B320. A locking component B310 is movably disposed within the second pivot joint B500 and adapted to lock into the locking groove group B320 to restrict relative rotation between the frame B110 and the tripod B120. Specifically, when the locking component B310 is locked into the locking groove group B320, the second locking mechanism B300 is considered to be in a locked state, and relative rotation between the frame B110 and the tripod B120 is restricted. When the locking component B310 releases its lock on the locking groove group B320, the second locking mechanism B300 is considered to be in an unlocked state, and relative rotation between the frame B110 and the tripod B120 is permitted. In this embodiment, the second drive member B330, for example, drives the locking component B310 to lock into the locking groove group B320, and the actuating mechanism B400 is connected to the second drive member B330. Optionally, when the actuation mechanism B400 is activated, the second drive member B330 is connected to the actuation transmission mechanism B410 in the actuation mechanism B400. The second drive member B330 drives the locking assembly B310 to move, thereby releasing the locking slot assembly B320. In other words, when the actuation mechanism B400 is activated, the second locking mechanism B300 can be released, allowing the rider frame B110 and the footrest B120 to rotate relative to each other.

[0186] Of course, in other embodiments (not shown in the figures of the second aspect), the first locking mechanism B200 may be, for example, a composite locking structure composed of a locking member and a locked member adapted together. In other words, the first locking mechanism B200 may also include a locking member, a locked member, and a cooperating component. The first locking mechanism B200 may include a locking member, a locked member, and a cooperating component. For example, in one embodiment, the armrest B130 is pivotally connected to the seat frame B140, and the seat frame B140 is pivotally connected to the footrest B120 and the handrail B110 via a second pivot. The first locking mechanism B200 may include, for example, a first locking member B210, a locking recess B220, and a transmission component (not shown in this embodiment). In this embodiment, the first locking member B210 is movably disposed on the dismount armrest B112 and connected to the first actuation transmission mechanism B410a in the actuation mechanism B400. The locking recess B220 is disposed on the armrest frame B130. The transmission assembly is movably disposed on the seat frame B140 and can drive and cooperate with both the first locking member B210 and the locking recess B220. Movement of the first locking member B210 drives the transmission assembly to move and disengage from the locking recess B220. Alternatively, in other embodiments, the first locking member B210 is movably disposed on the seat frame B140, the locking recess B220 is disposed on the armrest frame B130, and the transmission assembly is movably disposed on the dismount armrest B112 and drives and cooperates with both the first locking member B210 and the first actuation transmission mechanism B410a of the actuation mechanism B400. When the actuation mechanism B400 is activated, the transmission assembly drives the first locking member B210 to move and disengage from the locking recess B220.

[0187] Similarly, in one embodiment, the second locking mechanism B300 can also be a single locking structure composed of a locking member and a locked member. This can be understood as the second locking mechanism B300 also including a locking member and a locked member. For example, in one embodiment (related figures not shown in the second aspect), the tripod B120 and the frame B110 are pivotally connected. The second locking mechanism B300 may include a second locking member (i.e., the locking member) and a locking recess (i.e., the locked member). The locking recess is disposed on the pivot plate of the tripod B120 (not shown in the figures of the second aspect), and the second locking member is movably disposed on the frame B110 and adapted to be inserted into or retracted from the locking recess. When the second locking member is inserted into the locking recess, the relative rotation between the frame B110 and the tripod B120 is locked, thus restricting rotation about the second pivot. When the second locking member retracts from the locking recess, the relative rotation between the rider frame B110 and the footrest B120 is released, allowing rotation about the second pivot.

[0188] In addition to the choice of locking structure, the first locking mechanism B200 and the second locking mechanism B300 provided in this application can be independent locking mechanisms that are completely unrelated in the release stroke, or they can be non-independent locking mechanisms that overlap in part of the release stroke and can drive and cooperate with each other.

[0189] Referring again to Figures 19 and 20, in one embodiment, both the handrail B130 and the footrest B120 are pivotally connected to the handlebar B110. The handrail B130 is pivotally connected to the handlebar B110 via a first pivot, and the footrest B120 is pivotally connected to the handlebar B110 via a second pivot, wherein the first pivot is offset from the second pivot. When the handrail B130 is pivotally connected to the handlebar B110, a first locking mechanism B200 acts between the handrail B130 and the handlebar B110. The first locking mechanism B200 can selectively lock the engagement position between the handrail B130 and the handlebar B110. The first locking mechanism B200 is adapted to lock the handrail B130 in the extended position to restrict the handrail B130 from switching from the extended position to the retracted position. The second locking mechanism B300 acts between the frame B110 and the tripod B120. The second locking mechanism B300 can selectively lock the mating position between the frame B110 and the tripod B120. The second locking mechanism B300 is adapted to lock the frame B110 and the tripod B120 in a relatively extended position. In other words, the first locking mechanism B200 and the second locking mechanism B300 are spaced apart from each other. The first locking mechanism B200 and the second locking mechanism B300 are independently controlled by at least two actuation transmission mechanisms B410 (the relevant principles are explained later). By actuating the actuation mechanism B400, at least two actuation transmission mechanisms B410 operate synchronously (e.g., move) to simultaneously unlock the first locking mechanism B200 and the second locking mechanism B300. In this embodiment, when there are two actuation transmission mechanisms B410, in order to clearly understand the cooperation relationship between the two actuation transmission mechanisms B410 and the first locking mechanism B200 and the second locking mechanism B300 respectively, one of the actuation transmission mechanisms B410 is referred to as the first actuation transmission mechanism B410a, and the other actuation transmission mechanism B410 is referred to as the second actuation transmission mechanism B410b.

[0190] Optionally, in one embodiment (not shown in the figures of the second aspect), the first locking mechanism B200 and the second locking mechanism B300 are non-independent locking mechanisms that may overlap in part of their unlocking stroke and be mutually driveable; even, they may be connected to each other and driveable. In this case, the actuation mechanism B400 includes at least one actuation transmission mechanism B410, which cooperates with either the first locking mechanism B200 or the second locking mechanism B300. By actuating the actuation mechanism B400, at least one actuation transmission mechanism B410 simultaneously unlocks the first locking mechanism B200 and the second locking mechanism B300. Optionally, the first locking mechanism B200 may include, for example, a first locking member B210 and a locking recess B220. Handrail B130 is pivotally connected to the dismount handrail B112. A locking recess B220 is provided in the handrail B130. A first locking member B210 is movably disposed within the handrail B130 and adapted to insert into or retract from the locking recess B220. When the first locking member B210 is engaged with the locking recess B220, the handrail B130 is restricted from rotating about a first pivot. When the first locking member B210 retracts from the locking recess B220, the handrail B130 is allowed to rotate about the first pivot to fold. Optionally, the second locking mechanism B300 may include, for example, a mounting bracket B114. In this embodiment, the mounting bracket B114 is connected to the first locking member B210, movably disposed in the dismount handrail B112, and adapted to lock into the second pivot joint B500 to restrict the relative rotation of the dismount handrail B112 and the footrest B120. Alternatively, at least one actuation transmission mechanism B410 of the actuation mechanism B400 is connected to the first locking member B210 or the mounting bracket B114. When at least one actuation transmission mechanism B410 is connected to the first locking member B210 and the actuation mechanism B400 is activated, the first locking member B210 can be moved and disengaged from the locking recess B220 by the at least one actuation transmission mechanism B410. During this process, the first locking member B210 simultaneously moves the mounting bracket B114 to release the lock on the second pivot joint B500. When at least one actuation transmission mechanism B410 is connected to the mounting bracket B114 and the actuation mechanism B400 is activated, the mounting bracket B114 can be moved by the at least one actuation transmission mechanism B410 to release the lock on the second pivot joint B500. During this process, the mounting bracket B114 simultaneously moves the first locking member B210 and disengages from the locking recess B220. Of course, in other embodiments, the actuation mechanism B400 may also include two actuation transmission mechanisms B410, which are respectively connected to the first locking member B210 and the mounting bracket B114. When the actuation mechanism B400 is activated, the two actuation transmission mechanisms B410 can synchronously drive the first locking member B210 to move and disengage from the locking recess B220, and the mounting bracket B114 to move and release the lock on the second pivot joint B500.

[0191] The trolley B10 provided in this application includes an actuation mechanism B400 on the frame B100 comprising an actuation linkage mechanism B420 and two actuation transmission mechanisms B410. The actuation linkage mechanism B420 can be coupled to any position on the frame B100 to receive braking force generated by changes in the frame B100's shape or mechanism operation, thereby changing the locking state of the first locking mechanism B200 and the second locking mechanism B300. One end of each of the two actuation transmission mechanisms B410 is coupled to the actuation linkage mechanism B420, and the other end is coupled to the first locking mechanism B200 and the second locking mechanism B300, respectively. The two actuation transmission mechanisms B410 receive the braking force provided by the actuation linkage mechanism B420 and change the locking state of the first locking mechanism B200 and the second locking mechanism B300 through direct or indirect linkage.

[0192] In one embodiment, the actuation transmission mechanism B410 and / or the actuation linkage mechanism B420 can both be traction components, such as traction ropes. Of course, in other embodiments, the actuation transmission mechanism B410 and / or the actuation linkage mechanism B420 can also be formed by multiple links directly connected or in a transmission cooperation manner; no specific limitations are imposed here. Optionally, in this embodiment, as shown in Figures 19 to 21, both the actuation transmission mechanism B410 and the actuation linkage mechanism B420 are steel ropes. This simplifies the structure of the actuation mechanism B400, facilitates maintenance, and also improves the service life of the actuation mechanism B400.

[0193] Referring to Figure 24, in one embodiment, the actuation mechanism B400 is disposed within the rider frame B110, and includes an actuation linkage mechanism B420 and two actuation transmission mechanisms B410, both of which are connected to the actuation linkage mechanism B420. The first actuation transmission mechanism B410a drives and cooperates with the first locking mechanism B200, and the second actuation transmission mechanism B410b drives and cooperates with the second locking mechanism B300. When the user drives the release mechanism B600 (see Figure 18, detailed structure below), causing the actuation linkage mechanism B420 to be pulled, simultaneously, the two actuation transmission mechanisms B410 are also pulled, thereby simultaneously driving the first locking mechanism B200 and the second locking mechanism B300 to release. It should be noted that in this embodiment, the connection positions of the first actuation transmission mechanism B410a and the actuation linkage mechanism B420, and the connection positions of the second actuation transmission mechanism B410b and the actuation linkage mechanism B420 coincide, which can be understood as the three being connected at the same point. In this case, the actuation mechanism B400 has a Y-shaped structure. Of course, in other embodiments, the connection positions of the first actuation transmission mechanism B410a and the actuation linkage mechanism B420, and the connection positions of the second actuation transmission mechanism B410b and the actuation linkage mechanism B420 can be staggered, and no specific restrictions are imposed here.

[0194] The trolley B10 provided in this application may further include a release mechanism B600 mounted on the frame B100. The release mechanism B600 provides the actuating force required by the actuating mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300. Specifically, the release mechanism B600 can directly drive the actuating mechanism B400 to provide the actuating force required for the actuating mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300; or, the release mechanism B600 can indirectly drive the actuating mechanism B400 to provide the actuating force required for the actuating mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300.

[0195] Please refer to Figure 24, which shows a cross-sectional view of the trolley B10 in an embodiment of the second aspect of this application, wherein the frame B100 is in an unfolded state. As shown in Figures 18 and 24, in one embodiment, the release mechanism B600 can, for example, directly engage with the actuation mechanism B400. Optionally, the release mechanism B600 may include a release operation member B610 and a release drive member (not shown in the figures of the second aspect), wherein the release drive member is movably disposed within the handframe B110, and the release operation member B610 is movably disposed in the handframe B110 and engages with the release drive member. The actuation linkage mechanism B420 in the actuation mechanism B400 is directly connected to the release drive member. When the user operates the release operation member B610, the release operation member B610 actuates the release drive member to move the release drive member. During this process, the actuation linkage mechanism B420 will be pulled along with the release drive component. Simultaneously, the two actuation transmission mechanisms B410 will also be pulled, thereby releasing the first locking mechanism B200 and the second locking mechanism B300.

[0196] Optionally, the release mechanism B600 can indirectly drive the actuation linkage mechanism B420 to cooperate in action, providing the necessary actuating force for the actuation mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300. Optionally, the actuation linkage mechanism B420 can be located at any position on the frame B100. The release mechanism B600 can include a release operation member B610 and a release drive member (not shown in the figure of the second aspect). When the user operates the release operation member B610, the release operation member B610 is linked with the release drive member to move, thereby changing the usage state of the frame B100. The frame components of the frame B100 will then move and displace. During this process, the actuation linkage mechanism B420 will be pulled along with the movement of the frame B100. Simultaneously, the two actuation transmission mechanisms B410 are also pulled at the same time, thereby releasing the first locking mechanism B200 and the second locking mechanism B300 (the specific principle can be found later).

[0197] Please refer to Figures 15 to 17. Figure 15 shows a side view of a trolley B10 provided according to an embodiment of the second aspect of the present invention, wherein the frame B100 is in an unfolded state. Figure 16 shows a side view of a trolley B10 provided according to an embodiment of the second aspect of the present invention, wherein the frame B100 is in a transitional state between an unfolded state and a folded state. Figure 17 shows a side view of a trolley B10 provided according to an embodiment of the second aspect of the present invention, wherein the frame B100 is in a folded state.

[0198] As shown in Figure 16, in one embodiment, the frame B110 includes, for example, an upper frame B111 and a lower frame B112 pivotally connected to each other, and a first pivot joint B113 disposed between the upper frame B111 and the lower frame B112. The upper frame B111 and the lower frame B112 are rotatably connected via the first pivot joint B113. In other words, the first pivot joint B113 connects the upper frame B111 and the lower frame B112, and the upper frame B111 rotates relative to the lower frame B112 about the first pivot joint B113. The end of the lower frame B112 away from the upper frame B111 (i.e., the bottom of the lower frame B112) is pivotally connected to the footrest B120.

[0199] Please refer to Figures 25 and 26. Figure 25 is an exploded view of the handframe B110 in the trolley B10 shown in Figure 15, and Figure 26 is an exploded view of the handframe B110 in the trolley B10 shown in Figure 15 from another perspective. In one embodiment, as shown in Figures 25 and 26, the first pivot joint B113 includes a first connecting seat B1131 and a second connecting seat B1132. The first connecting seat B1131 and the second connecting seat B1132 are pivotally connected to a third pivot (not shown in the figures of the second aspect). This restricts the axial movement of the first connecting seat B1131 and the second connecting seat B1132, preventing them from separating or detaching from each other axially during rotation, thereby improving the stability of the first pivot joint B113. In one embodiment, the first connecting seat B1131 includes a first pivot portion B11311 and a first connecting portion B11312 connected to each other, and the second connecting seat B1132 includes a second pivot portion B11321 and a second connecting portion B11322 connected to each other. The first connecting portion B11312 connects to the upper frame B111, and the second connecting portion B11322 connects to the lower frame B112. The first pivot portion B11311 and the second pivot portion B11321 are rotatably connected about a third pivot. When the first pivot portion B11311 rotates relative to the second pivot portion B11321 about the third pivot, the first connecting portion B11312 can be unfolded or folded relative to the second connecting portion B11322, thereby causing the upper frame B111 to rotate relative to the lower frame B112 about the third pivot to unfold or fold. Optionally, when the first pivot portion B11311 rotates relative to the second pivot portion B11321 to unfold the first connecting portion B11312 relative to the second connecting portion B11322, as shown in FIG15, the included angle between the first connecting portion B11312 and the second connecting portion B11322 is approximately 180°, and the included angle between the upper frame B111 and the lower frame B112 is also approximately 180°, and the two can be considered to be on the same plane. Of course, in other embodiments, when the first connecting portion B11312 unfolds relative to the second connecting portion B11322, the included angle between the two can be greater than 180° or less than 180°, and correspondingly, the included angle between the upper frame B111 and the lower frame B112 is greater than 180° or less than 180°, without specific limitations.

[0200] Referring to Figures 25 and 26, in one embodiment, the first pivot joint B113 further includes a locking member B1133, which is axially movably disposed between the first connecting seat B1131 and the second connecting seat B1132 and has a locked position and an unlocked position. When the locking member B1133 is in the locked position, the first connecting seat B1131 and the second connecting seat B1132 are relatively fixed. When the locking member B1133 is in the unlocked position, the first connecting seat B1131 can rotate relative to the second connecting seat B1132. In other words, the locking member B1133 is disposed between the first connecting seat B1131 and the second connecting seat B1132 to restrict or allow the first connecting seat B1131 to rotate relative to the second connecting seat B1132. Optionally, the locking member B1133 can be generally considered as a gear structure and can be passed through by a third pivot. The first pivot portion B11311 has a first locking groove B11313 on the side facing the second pivot portion B11321, and the second pivot portion B11321 has a second locking groove B11323 on the side facing the first pivot portion B11311. Both the first locking groove B11313 and the second locking groove B11323 have protruding teeth that engage with the locking member B1133. When the locking member B1133 is in the locked position, the locking member B1133 engages with both the first locking groove B11313 and the second locking groove B11323, so that the first pivot portion B11311 and the second pivot portion B11321 remain relatively fixed, thereby keeping the first connecting seat B1131 and the second connecting seat B1132 relatively fixed. When the locking member B1133 is in the unlocked position, it engages with one of the first locking groove B11313 and the second locking groove B11323, while disengaging from the other. This allows the first pivot portion B11311 to rotate relative to the second pivot portion B11321, and consequently, the first connecting seat B1131 to rotate relative to the second connecting seat B1132. By providing the locking member B1133, the accidental folding of the overhead crane B110 can be prevented from being caused by the upper crane B111 rotating freely relative to the lower crane B112.

[0201] Referring again to Figures 25 and 26, in one embodiment, the first pivot joint B113 may further include a first driving member B1134, wherein the first driving member B1134 is axially disposed between the locking member B1133 and the first connecting seat B1131 (specifically, the first pivot portion B11311); or, the first driving member B1134 is axially disposed between the locking member B1133 and the second connecting seat B1132 (specifically, the second pivot portion B11321), and the first driving member B1134 is rotatable about a third pivot. Optionally, the locking member B1133 is provided with a driving portion B11331, and the first driving member B1134 is provided with a driving inclined surface B11341, the driving inclined surface B11341 extending obliquely along the circumference of the first driving member B1134, and the driving inclined surface B11341 is used to push against the driving portion B11331. When the first drive member B1134 rotates about the third pivot, it can push the drive part B11331 against the drive ramp B11341, causing the locking member B1133 to move axially until it reaches the unlocked position. In this embodiment, the release mechanism B600 is driven to cooperate with the first drive member B1134. When the release mechanism B600 is operated, it can drive the first drive member B1134 to rotate, thereby pushing the locking member B1133 to move to the unlocked position. In this way, the user can rotate the upper frame B111, so that the upper frame B111 rotates about the first pivot joint B113 relative to the lower frame B112.

[0202] Referring to Figures 18 and 19, in one embodiment, the release mechanism B600 includes a release operation member B610, a first turntable (not shown in the figures of the second aspect), and a linkage member B620. The first turntable is rotatably disposed within the handframe B110, and the release operation member B610 is movably disposed on the handframe B110 and drives the first turntable. Optionally, the first turntable is rotatably disposed on the upper handframe B111, and the release operation member B610 is movably disposed on the upper handframe B111, thus facilitating user operation. The linkage member B620 may be, for example, a traction rope, which connects to the first turntable and the first drive member B1134. When the release mechanism B610 is operated (e.g., pressed), it drives the first turntable to rotate. The linkage B620 moves within the handframe B110, causing the first drive member B1134 to rotate around the third pivot. Through the pushing engagement of the drive ramp B11341 and the drive section B11331, the locking member B1133 switches to the unlocked position, allowing the upper handframe B111 to rotate relative to the lower handframe B112 for retraction. In this embodiment, the release mechanism B600 directly releases the handframe B110. The retraction of the handframe B110 drives the actuation mechanism B400 (see later for details), thereby simultaneously releasing the first locking mechanism B200 and the second locking mechanism B300.

[0203] In one embodiment, the first pivot joint B113 is further provided with a first reset member B1135 (see Figures 25 and 26), which can be an elastic element such as a spring or a sheet. Optionally, the first reset member B1135 abuts against the locking member B1133 and provides an elastic restoring force to the locking member B1133, so that the locking member B1133 always has a tendency to move towards the locked position. When the first connecting seat B1131 is pivoted relative to the second connecting seat B1132 to be in the extended position, the locking member B1133 can be held in the locked position under the restoring force of the first reset member B1135. In this way, the first connecting seat B1131 can be kept extended relative to the second connecting seat B1132, and thus the upper frame B111 can be kept extended relative to the lower frame B112. When the first connecting seat B1131 is pivoted relative to the second connecting seat B1132 to be folded, the locking member B1133 can also be held in the locked position under the restoring force of the first reset member B1135. This allows the first connecting seat B1131 to remain folded relative to the second connecting seat B1132, and consequently, the upper frame B111 to remain folded relative to the lower frame B112, improving the stability of the frame B110 after folding. Referring to Figures 19 to 21, in one embodiment, as shown in Figures 19 to 21, the actuation mechanism B400 includes an actuation linkage mechanism B420 and two actuation transmission mechanisms B410, both of which are connected to the actuation linkage mechanism B420. The actuation linkage mechanism B420 can pass through the first pivot joint B113 and connect to the upper frame B111. Two actuation transmission mechanisms B410 are respectively driven and engaged with the first locking mechanism B200 and the second locking mechanism B300. When the upper frame B111 rotates around the first pivot joint B113 towards the lower frame B112, the actuation linkage mechanism B420 bends and moves around the first pivot joint B113 to simultaneously drive the first locking mechanism B200 and the second locking mechanism B300 to release. Therefore, the release mechanism B600 can indirectly drive the actuation mechanism B400 to cooperate, providing the necessary actuating force for the actuation mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300.

[0204] Optionally, considering the first pivot joint B113, the actuation linkage mechanism B420 in the actuation mechanism B400 sequentially passes through the second connecting portion B11322, the first pivot portion B11311 (or the second pivot portion B11321), and the first connecting portion B11312 to connect with the mounting seat B1111 inside the upper frame B111. Optionally, the first connecting seat B1131 and / or the second connecting seat B1132 are provided with guide portions B11314. When the first connecting seat B1131 pivots relative to the second connecting seat B1132 to fold relative to it, the actuation linkage mechanism B420 bends along the guide portion B11314 to drive the two actuation transmission mechanisms B410 to move. More preferably, the guide portion B11314 has an arc-shaped peripheral wall. When the first connecting seat B1131 pivots relative to the second connecting seat B1132 to unfold the upper frame B111 relative to the lower frame B112, the actuation linkage mechanism B420 is tangent to the arc-shaped peripheral wall. When the first connecting seat B1131 pivots relative to the second connecting seat B1132 to fold relative to each other, the arc-shaped peripheral wall is adapted to cause the actuation linkage mechanism B420 to bend. In this embodiment, the top of the lower frame B112 is sleeved outside the second connecting part B11322. The connection positions between the two actuation transmission mechanisms B410 and the actuation linkage mechanism B420 can be located inside the lower frame B112, or they can be located in the overlapping area where the top of the lower frame B112 and the second connecting part B11322 are sleeved. Therefore, when the first connecting seat B1131 pivots relative to the second connecting seat B1132 to unfold the upper frame B111 relative to the lower frame B112, the actuation linkage mechanism B420 is tangent to the arc-shaped peripheral wall, resulting in a short contact length between the actuation linkage mechanism B420 and the arc-shaped peripheral wall. At this time, the actuation linkage mechanism B420 and the two actuation transmission mechanisms B410 can be considered to be located in the same plane. However, as the first connecting seat B1131 pivots relative to the second connecting seat B1132, causing the upper frame B111 to fold relative to the lower frame B112, the actuation linkage mechanism B420 will follow the upper frame B111 in pivoting along the third pivot. This process allows the actuation linkage mechanism B420 to adhere to and bend along the arc-shaped peripheral wall, thereby increasing its contact length with the arc-shaped peripheral wall. During the bending process of the actuation linkage mechanism B420, it drives the two actuation transmission mechanisms B410 to move along the length of the lower frame B112 towards the top of the lower frame B112 (switching from Figure 21 to Figure 20). This allows the first locking mechanism B200 and the second locking mechanism B300 to be released simultaneously. It should be noted that by setting an arc-shaped peripheral wall, the breakage of the actuation linkage mechanism B420 during bending can be effectively prevented, thereby improving the service life and reliability of the actuation mechanism B400. In this embodiment, by rotating the upper frame B111 and using the actuation mechanism B400, the first locking mechanism B200 and the second locking mechanism B300 can be driven to release simultaneously.This mechanism allows the handrail B130 to fold down, as well as the rider frame B110 and footrest B120 to fold down relative to each other. This design significantly simplifies the cumbersome folding process of the trolley B10 and effectively improves folding efficiency.

[0205] Please refer to Figures 22 and 23. Figure 22 is a cross-sectional view of the trolley B10 in an embodiment of the second aspect of this application, wherein the frame B110 is in an unfolded state. Figure 23 is a cross-sectional view of the handlebars B100 in the trolley B10 in an embodiment of the second aspect of this application, wherein the upper handlebars B111 rotate relative to the lower handlebars B112 to fold up.

[0206] As shown in Figures 22 and 23, optionally, in one embodiment, the actuation linkage mechanism B420 can be connected not only to the upper frame B111, but also directly to the first pivot joint B113. The actuation mechanism B400 includes the actuation linkage mechanism B420 and two actuation transmission mechanisms B410, both of which are connected to the actuation linkage mechanism B420. The actuation linkage mechanism B420 is directly connected to the first pivot joint B113. The two actuation transmission mechanisms B410 are respectively driven and engaged with the first locking mechanism B200 and the second locking mechanism B300. When the upper frame B111 rotates around the first pivot joint B113 towards the lower frame B112, the actuation linkage mechanism B420 bends and moves with the first pivot joint B113, simultaneously driving the first locking mechanism B200 and the second locking mechanism B300 to release. Thus, the release mechanism B600 can also indirectly drive the actuation mechanism B400 to work together, providing the necessary actuation force for the actuation mechanism B400 to simultaneously release the first locking mechanism B200 and the second locking mechanism B300.

[0207] Optionally, referring to Figures 22 and 23, in one embodiment, the actuation mechanism B400 is located on the lower frame B112, and the actuation linkage mechanism B420 extends into and connects to the first pivot joint B113. Optionally, when the upper frame B111 rotates relative to the lower frame B112, the lower frame B112 and the second connecting seat B1132 can be considered to remain stationary, and the upper frame B111, the first connecting seat B1131, and the locking member B1133 all rotate about a third pivot. More preferably, the first connecting seat B1131 or the locking member B1133 is provided with a fixing part B11315, which is adapted to connect with the actuation linkage mechanism B420. The fixing part B11315 is provided on the arcuate peripheral wall of the first connecting seat B1131 or the outer peripheral wall of the locking member B1133. Therefore, when the upper frame B111 rotates relative to the lower frame B112, the actuation linkage mechanism B420 rotates around the third pivot with the first connecting seat B1131 or the locking member B1133, which in turn allows it to bend and move around the arc-shaped peripheral wall or the side wall of the locking member B1133, so that the two actuation transmission mechanisms B410 move simultaneously, ultimately realizing the simultaneous release of the first locking mechanism B200 and the second locking mechanism B300.

[0208] The trolley B10 provided in this application has a first locking mechanism B200 and a second locking mechanism B300 that can be locked onto two sets of frame structures composed of four different frame assemblies, and can also achieve the effect of synchronous unlocking. In one embodiment, the trolley B10 structure includes a frame B100, a first locking mechanism B200, a second locking mechanism B300, and an actuation mechanism B400. The frame B100 includes a first frame assembly, a second frame assembly, a third frame assembly, and a fourth frame assembly. The first locking mechanism B200 is disposed on the frame B100, and the first locking mechanism B200 can selectively lock the mating positions of the first frame assembly and the second frame assembly. The second locking mechanism B300 is disposed on the frame B100, and the second locking mechanism B300 can selectively lock the mating positions of the third frame assembly and the fourth frame assembly. The actuation mechanism B400 is located on the frame B100, and the actuation mechanism B400 is simultaneously driven and cooperated with the first locking mechanism B200 and the second locking mechanism B300. The actuation mechanism B400 is activated so that the first locking mechanism B200 and the second locking mechanism B300 are simultaneously unlocked.

[0209] The first frame assembly, second frame assembly, third frame assembly, and fourth frame assembly of the frame B100 may be selected from four of the following: handrail B110, footrest B120, armrest B130, seat frame B140, wheel frame B150, canopy frame, and storage basket frame, but are not limited thereto. Any frame assembly that can be installed on the frame B100 to substantially benefit the function of the trolley B10 should be considered to be within the scope of this specification.

[0210] Optionally, in one embodiment, the first frame assembly may be, for example, an armrest frame B130, the second frame assembly may be, for example, a seat frame B140, the third frame assembly may be, for example, a footrest B120, and the fourth frame assembly may be, for example, a handlebar frame B110. The footrest B120 is pivotally connected to the handlebar frame B110, and the armrest frame B130 is pivotally connected to the seat frame B140. The seat frame B140 and the handlebar frame B110 cooperate with each other. When the armrest frame B130 is pivotally connected to the seat frame B140, a first locking mechanism B200 acts between the armrest frame B130 and the seat frame B140, and the first locking mechanism B200 can selectively lock the cooperative position between the armrest frame B130 and the seat frame B140. When the tripod B120 and the handframe B110 are pivotally connected, the second locking mechanism B300 acts between the tripod B120 and the handframe B110, and the second locking mechanism B300 can selectively lock the mating position between the tripod B120 and the handframe B110.

[0211] The first locking mechanism B200 is adapted to lock the armrest frame B130 and the seat frame B140 in a relatively unfolded position, at which time the armrest frame B130 is restricted from rotating relative to the seat frame B140 to fold. The first locking mechanism B200 may include, for example, a first locking member B210, a locking recess B220, and a transmission assembly (not shown in the figures of the second aspect). The first locking member B210 is movably disposed on the armrest frame B110 and connected to the first actuation transmission mechanism B410a in the actuation mechanism B400. The locking recess B220 is disposed on the armrest frame B130. The transmission assembly is movably disposed on the seat frame B140 and can drively engage with the first locking member B210 and the locking recess B220 respectively. Movement of the first locking member B210 drives the transmission assembly to move and disengage from the locking recess B220. The second locking mechanism B300 includes a second locking member (i.e., the locking element) and a locking recess (i.e., the locked element). A locking recess is provided on the pivot plate of the footrest B120 (not shown in the second aspect figure), and a second locking member is movably provided on the frame B110 and adapted to be inserted into or removed from the locking recess. When the second locking member is inserted into the locking recess, the relative rotation between the frame B110 and the footrest B120 is locked to restrict rotation about the second pivot. When the second locking member is removed from the locking recess, the relative rotation between the frame B110 and the footrest B120 is released to allow rotation about the second pivot. The second locking member is movably disposed on the rider frame B110 and connected to the second actuation transmission mechanism B410b in the actuation mechanism B400. When the actuation mechanism B400 is activated (for example, when the actuation linkage mechanism B420 bends to drive the two actuation transmission mechanisms B410, that is, when the first actuation transmission mechanism 410a and the second actuation transmission mechanism 410b move), the first locking member B210 and the second locking member are driven by the two actuation transmission mechanisms B410 to disengage from the locked position.

[0212] Optionally, in one embodiment, the first frame assembly may be, for example, a handlebar frame B110, the second frame assembly may be, for example, a rear stand B122, the third frame assembly may be, for example, a front stand B121, and the fourth frame assembly may be, for example, a wheel frame B150. The handlebar frame B110 is pivotally connected to the rear stand B122, and the front stand B121 is pivotally connected to the wheel frame B150. The handlebar frame B110 is pivotally connected to the front stand B121 and the rear stand B122. When the frame B110 is pivotally connected to the rear leg B122, the first locking mechanism B200 acts between the frame B110 and the rear leg B122. The first locking mechanism B200 can selectively lock the mating position between the frame B110 and the rear leg B122. When the front leg B121 is pivotally connected to the wheel frame B150, the second locking mechanism B300 can selectively lock the mating position between the front leg B121 and the wheel frame B150. The first locking mechanism B200 may include, for example, a first locking member (not shown in this embodiment) and a corresponding locking recess (not shown in this embodiment). The locking recess is provided on the pivot plate of the rear leg B122 (not shown in the figure of the second aspect), and the first locking member is movably provided on the frame B110 and is adapted to be inserted into or retracted from the locking recess. When the first locking member is inserted into the locking recess, the relative rotation between the rider frame B110 and the rear leg frame B122 is locked, restricting rotation about the pivot. When the first locking member (not shown in this embodiment) is disengaged from the locking recess (not shown in this embodiment), the relative rotation between the rider frame B110 and the rear leg frame B122 is released, allowing rotation about the pivot. The second locking mechanism B300 may include, for example, a second locking member (not shown in this embodiment) and a corresponding locking recess (not shown in this embodiment). The locking recess is disposed on the wheel seat (not labeled in this embodiment) of the wheel frame B150, and the second locking member is movably disposed on the front leg frame B121 and adapted to be inserted into or disengaged from the locking recess. When the second locking member is inserted into the locking recess, the relative rotation between the front leg frame B121 and the wheel frame B150 is locked, restricting rotation about the pivot. When the second locking member (not shown in this embodiment) disengages from the locking recess (not shown in this embodiment), the relative rotation between the front stand B121 and the wheel frame B150 is released, allowing rotation about the pivot.The first locking member is movably mounted on the frame B110 and connected to the first actuation transmission mechanism B410a in the actuation mechanism B400. The second locking member is movably mounted through the frame B110 on the front stand B121 and connected to the second actuation transmission mechanism B410b in the actuation mechanism B400. When the actuation mechanism B400 is activated (for example, when the actuation linkage mechanism B420 bends to drive the two actuation transmission mechanisms B410, i.e., when the first actuation transmission mechanism B410a and the second actuation transmission mechanism B410b move), the first locking member B210 and the second locking member B310 are driven by the two actuation transmission mechanisms B410 to disengage from the locked position. With this design, the wheel seat of the wheel frame B150 can rotate relative to the front stand B121 when the frame 10 is folded, thus reducing the volume of the frame B10 after folding.

[0213] The following description, in conjunction with relevant illustrations, illustrates the arrangement of the frame components included in the frame B100 in one embodiment.

[0214] Referring to Figures 15 to 17, in one embodiment, the frame B110 includes, for example, an upper frame B111 and a lower frame B112 pivotally connected to each other, and a first pivot joint B113 disposed between the upper frame B111 and the lower frame B112. The upper frame B111 and the lower frame B112 are rotatably connected via the first pivot joint B113. In other words, the first pivot joint B113 connects the upper frame B111 and the lower frame B112, and the upper frame B111 rotates relative to the lower frame B112 about the first pivot joint B113. The end of the lower frame B112 away from the upper frame B111 (i.e., the bottom of the lower frame B112) is pivotally connected to the footrest B120.

[0215] Referring to Figures 15 to 17, in one embodiment, the tripod B120 includes a front tripod B121 and a rear tripod B122 rotatably connected, which can rotate relative to each other to unfold or fold. The handlebar B110 (specifically, the lower handlebar B112) can be pivotally connected to either the front tripod B121 or the rear tripod B122; alternatively, the lower handlebar B112, the front tripod B121, and the rear tripod B122 are pivotally connected to the same pivot, for example, all three are pivotally connected to a second pivot. In this embodiment, the frame B100 has an unfolded state and a folded state. As shown in Figure 15, when the frame B100 is in the unfolded state, the front tripod B121, the rear tripod B122, and the lower handlebar B112 are circumferentially spaced along the second pivot, and the rear tripod B122 is circumferentially located between the front tripod B121 and the lower handlebar B112. The front leg B121 and the rear leg B122 form a first angle α1, the rear leg B122 and the lower frame B112 form a second angle α2, and the front leg B121 and the lower frame B112 form a third angle α3. As shown in Figure 17, when the frame B100 is in the folded state, the front leg B121 and the rear leg B122 form a fourth angle α4, the rear leg B122 and the lower frame B112 form a fifth angle α5, and the front leg B121 and the lower frame B112 form a sixth angle α6. Where α1 > α4, α2 > α5, and α3 > α6. When the frame B100 switches from the unfolded state to the folded state, the upper frame B111 rotates around the first pivot joint B113 to fold towards the lower frame B112, the lower frame B112 rotates around the second pivot to fold towards the rear frame B122, and the front frame B121 rotates around the second pivot to fold towards the rear frame B122. When the frame B100 switches from the folded state to the unfolded state, the front frame B121 rotates around the second pivot to move away from the rear frame B122, the lower frame B112 rotates around the second pivot to move away from the rear frame B122, and the upper frame B111 rotates around the first pivot joint B113 to move away from the lower frame B112. Therefore, when the trolley B10 is needed, it can be unfolded; when the trolley B10 needs to be stored, it can be folded to save space and facilitate storage.

[0216] Referring again to Figures 15 to 17, in one embodiment, the seat frame B140 may be pivotally connected to, for example, the footrest B120 and / or the handrail B110. For example, the seat frame B140 is pivotally connected to the footrest B120; or, the seat frame B140 is pivotally connected to the handrail B110; or, the seat frame B140 is pivotally connected to both the footrest B120 and the handrail B110. In this embodiment, the seat frame B140, footrest B120, and handrail B110 are coaxially pivotally connected to a second pivot. Optionally, the seat frame B140, front footrest B121, rear footrest B122, and handrail B112 are coaxially pivotally connected to the second pivot. When the frame B100 is in the unfolded state and placed on the ground, the seat frame B140 is generally parallel to the ground to support the child's hips and legs. When the frame B100 is folded, the seat frame B140 is folded and close to the front stand B121 and rear stand B122. It should be noted that when the frame B100 is unfolded, the angle between the seat frame B140 and the front stand B121 is greater than the angle between the seat frame B140 and the front stand B121 when the frame B100 is folded. Similarly, when the frame B100 is unfolded, the angle between the seat frame B140 and the rear stand B122 is greater than the angle between the seat frame B140 and the rear stand B122 when the frame B100 is folded. When the handrail B110 is unfolded, the angle between the seat frame B140 and the lower handrail B112 is greater than the angle between the seat frame B140 and the lower handrail B112 when the frame B100 is folded.

[0217] Figure 18 is an exploded view of the trolley B10 according to an embodiment of the second aspect of the present invention. Referring to Figures 15 and 18, in one embodiment, the trolley B10 further includes a second pivot joint B500. The legs B120, the handlebars B110, and the seat frame B140 are rotatably connected via the second pivot joint B500. In other words, the second pivot joint B500 connects the legs B120, the handlebars B110, and the seat frame B140. The handlebars B110 can rotate relative to the legs B120 about the second pivot joint B500, and the seat frame B140 can rotate relative to the handlebars B110 and the legs B120 about the second pivot joint B500. Optionally, the front legs B121, the rear legs B122, the lower handlebars B112, and the seat frame B140 are rotatably connected via the second pivot joint B500. The second pivot joint B500 may include, for example, a first fixed seat B510, a second fixed seat B520, a third fixed seat B530, and a fourth fixed seat B540. The first fixed seat B510, the second fixed seat B520, the third fixed seat B530, and the fourth fixed seat B540 are sequentially pivotally connected axially to the second pivot. In other words, the first fixed seat B510, the second fixed seat B520, the third fixed seat B530, and the fourth fixed seat B540 are sequentially connected axially to the second pivot, and all can rotate about the second pivot. The fourth fixed seat B540 is closer to the inner side of the frame B100 than the first fixed seat B510. The first fixed seat B510 is connected to the lower handrail B112, the fourth fixed seat B540 is connected to the seat frame B140, and one of the second fixed seat B520 and the third fixed seat B530 is connected to the front footrest B121, and the other is connected to the rear footrest B122. Optionally, in this embodiment, the second fixing seat B520 is connected to the front leg B121, and the third fixing seat B530 is connected to the rear leg B122. When the fixing seats rotate relative to each other to fold together, each fixing seat drives the corresponding frame to rotate, so that the frame B100 switches to the folded state. When the fixing seats rotate relative to each other to unfold, each fixing seat drives the corresponding frame to rotate, so that the frame B100 is in the unfolded state.

[0218] Please refer again to Figures 15 to 17. In one embodiment, the handrail frame B130 is pivotally connected to the alighting frame B112, so that the handrail frame B130 has an extended position and a retracted position relative to the alighting frame B112. When the handrail frame B130 is in the extended position, the angle between it and the alighting frame B112 is greater than the angle between them when the handrail frame B130 is in the retracted position. In this embodiment, when the handrail frame B130 is in the retracted position, the angle between it and the alighting frame B112 can be 0° or close to 0°, and no specific limitation is made here. Optionally, in other embodiments, the handrail frame B130 is pivotally connected to the seat frame B140, so that the handrail frame B130 also has an extended position and a retracted position. Similarly, when the armrest B130 is in the extended position, the angle between it and the seat frame B140 is greater than the angle between the armrest B130 and the seat frame B140 when the armrest B130 is in the folded position. When the armrest B130 is in the folded position, the angle between it and the seat frame B140 can be 0° or close to 0°, without any specific restrictions.

[0219] The locking principles of the first locking mechanism B200 and the second locking mechanism B300 in one embodiment are explained below with reference to the relevant diagrams.

[0220] Figure 27 is an exploded view of the handrail B110 and armrest B130 in the trolley B10. Please refer to Figures 19, 20, and 27 in conjunction. In one embodiment, the first locking mechanism B200 specifically includes a locking recess B220 and a first locking member B210. The armrest B130 is provided with the locking recess B220. The first locking member B210 is connected to the first actuation transmission mechanism B410a in the actuation mechanism B400, and the first locking member B210 is movably disposed within the lower handrail B112 and has a first locking position and a first unlocking position. Optionally, when the first locking member B210 is in the first locking position, the first locking member B210 is engaged with the locking recess B220, and the armrest B130 remains in the unfolded position, that is, the armrest B130 is restricted from rotating from the unfolded position to the folded position. When the first locking member B210 is in the first unlocking position, the first locking member B210 retracts from the locking recess B220, allowing the handrail B130 to switch from the extended position to the retracted position. Optionally, the first locking position and the first unlocking position are spaced apart along the length of the lower handrail B112, and the first unlocking position is closer to the top of the lower handrail B112 than the first locking position. When the upper handrail B111 rotates relative to the lower handrail B112 to bend the handrail B110, the actuation mechanism B400 can be used to move the first locking member B210 from the first locking position to the first unlocking position.

[0221] It should be noted that in this embodiment, the moving direction of the first locking member B210 is parallel to the extending direction of the first actuation transmission mechanism B410a. Since the two are directly connected and move in the same direction, this design not only optimizes the force transmission path and improves the response speed and sensitivity of the first locking member B210, but also simplifies the structure and enhances the overall reliability.

[0222] In this embodiment, as shown in Figures 19 and 20, the lowering frame B112 may, for example, be provided with a mounting bracket B114. In this embodiment, the mounting bracket B114 is used to support the first locking member B210. Optionally, the first locking member B210 is movably disposed on the mounting bracket B114 so that it can move relative to the lowering frame B112 to insert into or retract from the locking recess B220. Further, in this embodiment, the lowering frame B112 is also provided with a second reset member B115. The second reset member B115 may be, for example, an elastic element such as a spring or a spring sheet, which abuts against the first locking member B210 and is used to drive the first locking member B210 to insert into the locking recess B220. Optionally, the second reset member B115 is a spring, with its two ends abutting against the first locking member B210 and the mounting bracket B114, respectively. When the handrail B130 is switched to the unfolded position, the locking recess B220 is opposite to the first locking member B210, and the second reset member B115 drives the first locking member B210 to automatically insert into the locking recess B220 so that the handrail B130 is locked in the unfolded position.

[0223] Referring to Figures 19 and 20, in one embodiment, the handrail frame B130 is provided with a pusher portion B131, which is located approximately near the pivot point between the handrail frame B130 and the dismount handrail frame B112. The pusher portion B131 has an arc-shaped structure, and when the handrail frame B130 is rotated to switch from a folded position to an unfolded position, the pusher portion B131 guides the first locking member B210 into the locking recess B220.

[0224] Referring to Figure 27, in one embodiment, the trolley B10 further includes a third reset member B132. The third reset member B132 can be, for example, an elastic element such as a torsion spring, which abuts against the armrest frame B130 and drives the armrest frame B130 to remain in the folded position. Optionally, the armrest frame B130 is pivotally connected to the lower armrest frame B112 via a first pivot. The third reset member B132 is a torsion spring, which is sleeved outside the first pivot, and its two ends abut against the lower armrest frame B112 and the armrest frame B130, respectively. When the first locking member B210 switches to the first unlocking position, i.e., when the first locking member B210 retracts from the locking recess B220, the elastic restoring force of the torsion spring allows the armrest frame B130 to automatically switch from the unfolded position to the folded position without requiring the user to manually rotate the armrest frame B130 to fold it. This further improves the convenience of folding the trolley B10.

[0225] Referring to Figures 20, 28 to 30, in this embodiment, the second locking mechanism B300 includes a locking component B310, a locking groove group B320, and a second driving member B330. The locking component B310 includes a second locking member B311, a third locking member B312, and a fourth locking member B313. The locking groove group B320 includes a first locking groove B321, a second locking groove B322, a third locking groove (not shown in the figures), and a fourth locking groove B323. Optionally, the first fixing seat B510 has a first locking groove B321 on the side facing the second fixing seat B520, the second fixing seat B520 has a second locking groove B322 on the side facing the first fixing seat B510, the third fixing seat B530 has a third locking groove on the side facing the fourth fixing seat B540, and the fourth fixing seat B540 has a fourth locking groove B323 on the side facing the third fixing seat B530. The second locking member B311 is axially movably disposed between the first fixed seat B510 and the second fixed seat B520 and has a second locking position and a second unlocking position. Optionally, the second locking member B311 is a gear structure and can be passed through by a second pivot. Both the first locking groove B321 and the second locking groove B322 are provided with protruding teeth that mesh with the second locking member B311. When the second locking member B311 is in the second locking position, both ends of the second locking member B311 along the axial direction are respectively located in the first locking groove B321 and the second locking groove B322. Thus, the second locking member B311 simultaneously engages with the first fixed seat B510 and the second fixed seat B520, keeping the first fixed seat B510 and the second fixed seat B520 relatively fixed (i.e., the first fixed seat B510 is restricted from rotating relative to the second fixed seat B520). When the second locking member B311 is in the second unlock position, it moves completely into the second locking groove B322, engages with the second fixed seat B520, and disengages from the first fixed seat B510, allowing the first fixed seat B510 to rotate relative to the second fixed seat B520. Alternatively, in other embodiments, when the second locking member B311 is in the second unlock position, it can also move completely into the first locking groove B321, engage with the first fixed seat B510, and disengage from the second fixed seat B520, allowing the first fixed seat B510 to rotate relative to the second fixed seat B520.

[0226] In one embodiment, as shown in FIG28, the second driving member B330 is rotatably disposed axially between the second locking member B311 and the first fixed seat B510, or between the second locking member B311 and the second fixed seat B520. When the second driving member B330 rotates, it can drive the second locking member B311 to switch from a second locked position to a second unlocked position. Optionally, the second driving member B330 is rotatably sleeved outside the second pivot and has a first position and a second position. When the second driving member B330 rotates to switch from the first position to the second position, it can push the second locking member B311 axially from the second locked position to the second unlocked position. In this embodiment, the second driving member B330 is connected to the second actuation transmission mechanism B410b. When the actuation mechanism B400 is activated (for example, when the actuation linkage mechanism B420 bends to drive the two actuation transmission mechanisms B410, i.e., when the first actuation transmission mechanism B410a and the second actuation transmission mechanism B410b move), the second actuation transmission mechanism B410b can pull the second drive member B330 to rotate around the second pivot, so that the second drive member B330 switches from the first position to the second position, and then the second locking member B311 switches from the second locked position to the second unlocked position.

[0227] To achieve the conversion of the second driving member B330 from rotational motion to driving the second locking member B311 to move axially, in this embodiment, as shown in FIG28, the second driving member B330 is provided with an abutment portion B331, which protrudes axially and extends obliquely circumferentially. Simultaneously, as shown in FIG30, the first fixed base B510 is provided with a pushing portion B511, which also protrudes axially and extends obliquely circumferentially. The abutment portion B331 and the pushing portion B511 abut against each other axially. Optionally, when the second driving member B330 is in the first position, the abutment portion B331 and the pushing portion B511 are engaged with each other. During the process of the second driving member B330 rotating about the second pivot to switch to the second position, the abutment portion B331 and the pushing portion B511 rotate relative to each other and push against each other. This interaction can drive the second locking member B311 to move axially towards the second unlocking position. In this embodiment, when the actuation mechanism B400 is activated, the second actuation transmission mechanism B410b can drive the second driving member B330 to rotate around the second pivot from the first position to the second position, thereby driving the second locking member B311 to move from the second locked position to the second unlocked position.

[0228] Referring to Figures 28 and 29, in one embodiment, the third locking member B312 is axially movably disposed on the side of the third fixed seat B530 opposite to the second fixed seat B520. The third locking member B312 has a third locking position and a third unlocking position and is provided with at least one locking portion B3121, which extends axially. When the third locking member B312 is in the third locking position, at least one locking portion B3121 passes axially sequentially through the third fixed seat B530 and the second fixed seat B520, and the locking portion B3121 is radially spaced from the second pivot. This restricts the second fixed seat B520 from rotating relative to the third fixed seat B530 about the second pivot, thus fixing the second fixed seat B520 and the third fixed seat B530 relative to each other. When the third locking member B312 is in the third unlocking position, at least one locking portion B3121 passes axially only through the third fixed seat B530, allowing the second fixed seat B520 to rotate relative to the third fixed seat B530.

[0229] It should be noted that the aforementioned "at least one locking part B3121" means that there can be one, two, or more locking parts B3121, and when multiple locking parts B3121 are provided, they can be arranged at intervals around the circumference. Optionally, in this embodiment, the third locking member B312 is provided with a main body B3122, and the locking parts B3121 are formed by protruding axially from the main body B3122. More preferably, the main body B3122 has a ring-shaped structure for the second pivot to pass through, and the third locking member B312 is provided with multiple locking parts B3121, which are arranged at intervals around the circumference of the main body B3122. In this way, by having multiple locking parts B3121 pass through the third fixing seat B530 and the second fixing seat B520 simultaneously, the stability of the third locking member B312 in locking the second fixing seat B520 and the third fixing seat B530 can be improved.

[0230] Referring to Figures 28 to 30, in one embodiment, the first fixing seat B510 is provided with a first limiting post B512 extending axially, the second fixing seat B520 is provided with a second limiting post B521 extending axially, and the third fixing seat B530 is provided with a third limiting post B531 extending axially. The first limiting post B512, the third limiting post B531, and the second limiting post B521 are arranged sequentially circumferentially. When the frame B100 is in the unfolded state, the first fixing seat B510, the second fixing seat B520, and the third fixing seat B530 are relatively fixed, and the third limiting post B531 abuts against at least one of the first limiting post B512 and the second limiting post B521. Optionally, in this embodiment, as shown in Figure 31, the third limiting post B531 abuts against both the first limiting post B512 and the second limiting post B521. In this way, the third fixing seat B530 can remain relatively fixed to both the second fixing seat B520 and the first fixing seat B510. Specifically, the third fixing seat B530 cannot rotate relative to the second fixing seat B520, nor can it rotate relative to the first fixing seat B510. Therefore, when the frame B100 is in the unfolded state, in addition to the third locking member B312 ensuring the relative fixation between the second fixing seat B520 and the third fixing seat B530, the mutual abutment of the third limiting post B531 with the first limiting post B512 and the second limiting post B521 further achieves the relative fixation between the second fixing seat B520 and the third fixing seat B530. This improves the stability and reliability of the frame B100 when it is in the unfolded state. When the frame B100 is in the folded state, as shown in Figure 32, the first limiting post B512, the third limiting post B531 and the second limiting post B521 are arranged circumferentially at intervals. At this time, the third fixing seat B530 can rotate relative to the first fixing seat B510 and the second fixing seat B520.

[0231] In this embodiment, as shown in Figures 28 to 30, the first limiting post B512 protrudes axially toward the second fixed seat B520, the second limiting post B521 protrudes axially toward the first fixed seat B510, and the third limiting post B531 protrudes axially toward the first fixed seat B510 and passes through the second fixed seat B520. Alternatively, the second fixed seat B520 is provided with a movable groove B522 (see Figures 31 and 32) for the third limiting post B531 to move circumferentially, and this movable groove B522 is an arc-shaped groove, so that the first limiting post B512 and the third limiting post B531 can move circumferentially within the second fixed seat B520.

[0232] Referring to Figure 29, in one embodiment, the fourth locking member B313 is axially movably disposed between the third fixed seat B530 and the fourth fixed seat B540, and has a fourth locking position and a fourth unlocking position. Optionally, the fourth locking member B313 is also a gear structure and can be passed through by the second pivot. Both the third locking groove and the fourth locking groove B323 are provided with protruding teeth that mesh with the fourth locking member B313. When the fourth locking member B313 is in the fourth locking position, both ends of the fourth locking member B313 along the axial direction are respectively engaged in the third locking groove and the fourth locking groove B323. In this way, the fourth locking member B313 can simultaneously engage with the third fixed seat B530 and the fourth fixed seat B540, so that the third fixed seat B530 and the fourth fixed seat B540 remain relatively fixed. When the fourth locking member B313 is in the fourth unlocking position, the fourth locking member B313 moves completely into the fourth locking groove B323, and the fourth locking member B313 engages with the fourth fixed seat B540, while disengaging from the third fixed seat B530, so that the third fixed seat B530 can rotate relative to the fourth fixed seat B540.

[0233] It should be noted that, in this embodiment, when the second driving member B330 rotates to switch from the first position to the second position, the second driving member B330 pushes the second locking member B311 to move axially from the second locked position to the second unlocked position. During this process, the second locking member B311 pushes the locking part B3121 to move axially until it disengages from the second fixed seat B520, so that the locking part B3121 only passes through the third fixed seat B530 and reaches the third unlocked position. The fourth locking member B313 is disposed between the fourth fixed seat B540 and the third locking member B312. When the third locking member B312 moves axially from the third locked position to the third unlocked position, the main body B3122 of the third locking member B312 can push the fourth locking member B313 to move axially from the fourth locked position to the fourth unlocked position. In other words, by changing the position of the second driving member B330, the positions of the second locking member B311, the third locking member B312, and the fourth locking member B313 can be changed simultaneously. In this way, the relative states of the first fixing seat B510, the second fixing seat B520, the third fixing seat B530, and the fourth fixing seat B540 can be changed simultaneously, allowing the frame B100 to switch between an unfolded state and a folded state. When the second locking member B311 is in the second unlocked position, the third locking member B312 is in the third unlocked position, and the fourth locking member B313 is in the fourth unlocked position, the second locking mechanism B300 is in the unlocked state, and the locking assembly B310 releases the lock on the locking groove group B320. When the second locking member B311 is in the second locked position, the third locking member B312 is in the third locked position, and the fourth locking member B313 is in the fourth locked position, the second locking mechanism B300 is in the locked state, and the locking assembly B310 engages with the locking groove group B320.

[0234] In one embodiment, as shown in FIG28, a fourth reset member B550 is provided between the second locking member B311 and the second fixed base B520. The fourth reset member B550 provides an elastic restoring force to the second locking member B311, so that the second locking member B311 is held in the second locked position. Thus, when the second driving member B330 moves from the second position to the first position, the second locking member B311 can automatically move from the second unlocked position to the second locked position under the reset force of the fourth reset member B550. Further, in one embodiment, as shown in FIG29, a fifth reset member B560 is provided between the fourth locking member B313 and the fourth fixed base B540. The fifth reset member B560 provides an elastic restoring force to the fourth locking member B313, so that the fourth locking member B313 is held in the fourth locked position. Thus, when the second driving member B330 moves from the second position to the first position, the fourth reset member B550 can drive the second locking member B311 to automatically move to the second locked position. This releases the pressure of the second locking member B311 on the third locking member B312. The fifth reset member B560 can then drive the fourth locking member B313 to automatically move to the fourth locked position, further pushing the third locking member B312 to the third locked position, ultimately restricting relative rotation between the first fixed base B510, the second fixed base B520, the third fixed base B530, and the fourth fixed base B540. In this embodiment, both the fourth reset member B550 and the fifth reset member B560 can be elastic elements such as springs or sheet elements.

[0235] The following is a brief explanation of the folding process and principle of the trolley B10 in this application, with reference to relevant illustrations.

[0236] In this embodiment, as shown in FIG19, when the frame B100 is in the unfolded state, the locking member B1133 is in the locked position, so that the upper handrail B111 and the lower handrail B112 can remain unfolded relative to each other. At the same time, when the frame B100 is in the unfolded state, the handrail B130 is in the unfolded position, and the first locking member B210 is in the first locked position (i.e., the first locking member B210 is inserted into the locking recess B220), so that the handrail B130 can be stably held in the unfolded position. Furthermore, referring to Figures 18, 28, and 29, when the trolley B10 is in the unfolded state, the second locking member B311 is in the second locking position, the third locking member B312 is in the third locking position, and the fourth locking member B313 is in the fourth locking position. This simultaneously maintains relative fixation between the first fixing seat B510 and the second fixing seat B520, between the second fixing seat B520 and the third fixing seat B530, and between the third fixing seat B530 and the fourth fixing seat B540. In other words, with the cooperation of the second locking member B311, the third locking member B312, and the fourth locking member B313, the front leg frame B121, the rear leg frame B122, the lower handrail B112, and the seat frame B140 can be kept relatively fixed, thereby ensuring that the frame B100 is stably maintained in the unfolded state.

[0237] When the user needs to switch the frame B100 from the unfolded state to the folded state (i.e., from Figure 15 to Figures 16 and 17 in sequence), referring to Figures 25 and 26, the user can operate the release mechanism B610. The release mechanism B610 drives the linkage B620 to move, which in turn drives the first drive component B1134 to rotate, ultimately driving the locking component B1133 to move from the locked position to the unlocked position. When the locking component B1133 moves to the unlocked position, the upper frame B111 is allowed to rotate relative to the lower frame B112. Therefore, the user can rotate the upper frame B111 to bring it closer to the lower frame B112 and fold it up. As described above, when the upper handrail B111 rotates relative to the lower handrail B112 to fold, the actuation linkage mechanism B420 of the actuation mechanism B400 bends along the guide portion B11314, thereby driving the two actuation transmission mechanisms B410 to move synchronously along the length direction of the lower handrail B112 towards the top of the lower handrail B112. Optionally, under the pull of the first actuation transmission mechanism B410a, the first locking member B210 can be moved to the first unlocking position (i.e., the first locking member B210 retracts from the locking recess B220), and the handrail B130 automatically switches to the folded position under the elastic restoring force of the third reset member B132, thereby realizing the folding of the handrail B130. Similarly, under the pull of the second actuation transmission mechanism B410b, the second driving member B330 can pivot around the second pivot to switch from the first position to the second position. During this process, the second driving member B330 directly drives the second locking member B311 to move from the second locked position to the second unlocked position. Simultaneously, the second locking member B311 pushes the third locking member B312 to move from the third locked position to the third unlocked position, and the third locking member B312 pushes the fourth locking member B313 to move from the fourth locked position to the fourth unlocked position. When the second driving member B330 switches to the second position, the second locking member B311 is in the second unlocked position, the fourth reset member B550 is in a compressed state, and the first fixed seat B510 can rotate relative to the second fixed seat B520 to bring the lower frame B112 and the front leg frame B121 closer together for folding. At the same time, the third locking member B312 is in the third unlocked position, and the locking part B3121 retracts from the second fixed seat B520. Thus, by rotating the second fixed seat B520 and / or the third fixed seat B530, the front leg frame B121 and the rear leg frame B122 can be brought closer together for folding. In addition, the fourth locking member B313 is in the fourth unlocking position, the fifth reset member B560 is in a compressed state, and the fourth fixing seat B540 can rotate relative to the third fixing seat B530 so that the seat frame B140 and the rear footrest B122 can move closer to each other to fold up.

[0238] The aforementioned trolley B10 has the following technical advantages:

[0239] In the aforementioned trolley B10, the actuation mechanism B400 is mounted on the frame B100 and simultaneously engages with the first locking mechanism B200 and the second locking mechanism B300. When the actuation mechanism B400 is activated, a single operation is required to simultaneously unlock and release the first locking mechanism B200 and the second locking mechanism B300. This design effectively avoids the cumbersome steps of operating different locking mechanisms separately in traditional methods, greatly simplifying the operation process. This not only significantly improves operational efficiency but also greatly enhances operational convenience, allowing users to easily and quickly unfold or adjust the shape of the frame 100. This provides users with great convenience and also offers a convenient, efficient, and easy-to-operate unlocking solution for the frame B100 locking mechanism, thereby facilitating the flexible use of the trolley B10 and significantly improving the user experience and practicality of the trolley.

[0240] Some embodiments of the third aspect of this application provide a stroller C10, which has a generally symmetrical structure and can be used as a children's stroller or a pet stroller. The structure and working principle of the stroller C10 will be described below using it as a children's stroller.

[0241] Referring to Figure 33, in the first embodiment of the third aspect, the trolley C10 may include a frame C100, a handrail frame C200, and a stop mechanism C300 (see Figure 38) provided in an embodiment of the third aspect of this application. The frame C100 may include a handrail C110, a footrest C120, and a seat frame C130. The stop mechanism C300 will be described in conjunction with the trolley C10 and the frame C100 described below.

[0242] Referring to Figures 33 and 34, in one embodiment, the frame C100 includes a handlebar frame C110, a footrest C120, a seat frame C130, and a second pivot joint C140. Two second pivot joints C140 are provided, spaced apart along the left-right direction (i.e., the first direction F1) of the trolley C10. The handlebar frame C110, footrest C120, and seat frame C130 are pivotally connected to the two second pivot joints C140, allowing the frame C100 to have an unfolded state (see Figure 33) and a folded state (see Figure 34). Optionally, when the frame C100 switches from the unfolded state to the folded state, the seat frame C130, footrest C120, and handlebar frame C110 all pivot around the second pivot joint C140 to move closer together. Accordingly, when the frame C100 switches from a folded state to an unfolded state, the seat frame C130, footrest C120, and handrail C110 move away from each other around the second pivot joint C140. Therefore, when the trolley C10 is needed, the frame C100 can be in the unfolded state; when the trolley C10 needs to be stored, the frame C100 can be in the folded state to save space and facilitate storage.

[0243] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "left" and "right" used in the various embodiments of the present invention refer to the "left" and "right" positions of the stroller C10 during normal operation, and the "left" and "right" directions are schematically indicated by arrows L and R in the figures. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0244] Referring to Figures 33 and 34, in one embodiment, the trolley frame C110 includes an upper trolley frame C111, a lower trolley frame C112, and a first pivot joint C113. Two first pivot joints C113 are provided, spaced apart along the left-right direction (i.e., the first direction F1) of the trolley C100. The upper trolley frame C111 and the lower trolley frame C112 are rotatably connected via the two first pivot joints C113. When the trolley frame C100 is in the unfolded state, the angle between the plane of the upper trolley frame C111 and the plane of the lower trolley frame C112 is approximately 180°, and both are located in the same plane. Of course, in other embodiments, when the trolley frame C100 is in the unfolded state, the angle between the plane of the upper trolley frame C111 and the plane of the lower trolley frame C112 may be greater than or less than 180°, and no specific limitation is made here. When the frame C100 is folded, the upper frame C111 and the lower frame C112 are close to each other, and the angle between the planes on which they are located is an acute angle, 0° or close to 0°, without specific restrictions.

[0245] Referring to Figures 33 and 34, the tripod C120 includes a front tripod C121 and a rear tripod C122, which are pivotally connected to each other via two second pivot joints C140 located on the left and right sides. In this embodiment, the bottom of the front tripod C121 is provided with at least one front wheel C151, and the bottom of the rear tripod C122 is provided with at least one rear wheel C152. Each second pivot joint C140 includes a first connecting seat C141, a second connecting seat C142, a third connecting seat C143, and a fourth connecting seat C144, which are pivotally connected to each other on a first rotating axis (not shown in the figure of the third aspect), that is, all four rotate around the first rotating axis. The four are arranged sequentially along the axial direction of the first rotating axis. Of course, in other embodiments, the first connecting seat C141 and the second connecting seat C142 can rotate around a first axis, the second connecting seat C142 and the third connecting seat C143 can rotate around a second axis (not shown in the figure of the third aspect), and the third connecting seat C143 and the fourth connecting seat C144 can rotate around a third axis (not shown in the figure of the third aspect), wherein the first axis, the second axis, and the third axis are parallel to each other but not coaxial. Alternatively, the first connecting seat C141, the second connecting seat C142, and the third connecting seat C143 can rotate around a first axis, while the fourth connecting seat C144 and the third connecting seat C143 can rotate around a second axis, wherein the first axis and the second axis are parallel to each other but not coaxial. Optionally, in this embodiment, the first connecting seat C141 is connected to the handlebar frame C110 (specifically, the lower handlebar frame C112), the second connecting seat C142 is connected to the front footrest C121, the third connecting seat C143 is connected to the rear footrest C122, and the fourth connecting seat C144 is connected to the seat frame C130. Of course, in other embodiments, the second connecting seat C142 may also be connected to the rear footrest C122, and the third connecting seat C143 may also be connected to the front footrest C121; no specific limitations are imposed here. As shown in Figures 35 and 36, when the frame C100 is in the unfolded state, the seat frame C130, front leg support C121, rear leg support C122, and handlebar support C110 are arranged sequentially and at intervals around the first pivot. The plane containing the front leg support C121 and the plane containing the rear leg support C122 form a first angle α1, creating a triangular structure with the ground, thus ensuring the frame C100 stands stably on the ground. The plane containing the rear leg support C122 and the handlebar support C110 (specifically, the lower handlebar support C112) forms a second angle α2. When the frame C100 is in the unfolded state, the seat frame C130 reaches a preset position, and its plane forms a third angle α3 with the plane containing the front leg support C121. At this time, the seat frame C130 is arranged approximately horizontally, facilitating child seating and effectively supporting the child's buttocks and legs.As shown in Figure 34, when the frame C100 is in the folded state, the seat frame C130, front leg frame C121, rear leg frame C122, and handlebar frame C110 move closer to each other around the first pivot. Specifically, the planes containing the front leg frame C121 and the rear leg frame C122 form a fourth angle α4; the planes containing the rear leg frame C122 and the handlebar frame C110 (specifically, the lower handlebar frame C112) form a fifth angle α5; and the planes containing the front leg frame C121 and the seat frame C130 form a sixth angle (not shown in the third aspect of the figure). Where α1 > α4, α2 > α5, and the third angle α3 is greater than the sixth angle.

[0246] Please refer to Figures 33 and 34. In one embodiment, the armrest C200 is mounted on the frame C100, providing convenient support for children when they are sitting on the seat frame C130, thereby improving the safety of children. In this embodiment, the armrest C200 is pivotally connected to the frame C100 and can fold simultaneously with the frame C100, thus further reducing the volume of the stroller C10 after folding.

[0247] In one embodiment, the armrest C200 pivots relative to the frame C100 to have a folded position (see FIG. 34), a first open position (see FIG. 35), and a second open position (see FIG. 36). Optionally, as shown in FIG. 34, when the frame C100 is in the folded state, the armrest C200 is in the folded position. As shown in FIG. 35 and FIG. 36, when the frame C100 is in the unfolded position, the armrest C200 has a first open position and a second open position, and it can switch between the first open position and the second open position. The first open position is between the folded position and the second open position. Therefore, during the folding process of the trolley C10, the armrest C200 will sequentially switch from the second open position to the first open position and then to the folded position (switching sequentially from FIG. 36 to FIG. 35 and FIG. 34). During the unfolding process of the trolley C10, the armrest C200 will sequentially switch from the folded position to the first open position and then to the second open position (switching sequentially from FIG. 34 to FIG. 35 and FIG. 36). It should be noted that in this embodiment, when the frame C100 is in the unfolded state and the armrest C200 is in the second open position (see Figure 36), the trolley C10 is ready for normal use.

[0248] It should be noted that the above-mentioned "handrail C200 pivotally connected to the frame C100" can include various implementations. For example, referring to Figures 34 to 36, in one embodiment, the handrail C200 can be pivotally connected to the second pivot joint C140. Optionally, the first connecting seat C141 includes a rotating seat C1411 and a mounting seat C1412. The rotating seat C1411 and the mounting seat C1412 are integrally formed or connected to each other by screws or other components. The rotating seat C1411 is connected to the first rotating shaft, the mounting seat C1412 is connected to the lowering handrail C112, and the handrail C200 is pivotally connected to the mounting seat C1412. Alternatively, in other embodiments, the handrail C200 can also be pivotally connected to the lowering handrail C112, without specific limitations. In this embodiment, when the handrail C200 is in the folded position, the plane of the handrail C200 is approximately parallel to the plane of the dismount handrail C112, forming a ninth angle α9 between them, which is approximately 180°. Of course, in other embodiments, due to the limitations of the mounting base C1412 structure, the ninth angle α9 can also be less than 180°, and this is not specifically limited here. When the handrail C200 is in the first open position, a seventh angle α7 is formed between the plane of the handrail C200 and the plane of the dismount handrail C112. When the handrail C200 is in the second open position, an eighth angle α8 is formed between the plane of the handrail C200 and the plane of the dismount handrail C112. Wherein, α9 > α7 > α8.

[0249] In one embodiment, when the frame C100 is in a folded state, the individual frames of the frame C100 remain relatively fixed. For example, the upper frame C111 and the lower frame C112 are relatively fixed through a first pivot joint C113, thereby keeping them in a relatively folded or unfolded state. The frame C110 (specifically the lower frame C112) and the front stand C121 are relatively fixed through a fixing structure C400 (see Figure 34, such as a pair of hooks, a pair of male and female buckles, or a pair of Velcro straps, etc.), thereby keeping them close together. It should be noted that in this embodiment, when the frame C110 and the front stand C121 are relatively fixed, the frame C110 (specifically the lower frame C112) and the rear stand C122 can be kept relatively fixed through a second pivot joint C140, thereby keeping them close together. Therefore, it can be understood that when the rider frame C110 and the front leg C121 remain relatively fixed, the rider frame C110 and the rear leg C122 will also remain relatively fixed, and the front leg C121 and the rear leg C122 will also remain relatively fixed.

[0250] During the transition of the frame C100 from a folded to an unfolded state, the locking mechanism C400 is first released. This allows the handframe C110 to rotate relative to the front leg C121, as well as the handframe C110 and the rear leg C122, and the front leg C121 and the rear leg C122 to rotate relative to each other. In this embodiment, as shown in Figures 35 and 36, an elastic pushing member C800 (such as a torsion spring, spring sheet, elastic contact strip, etc.) is provided between the front leg C121 and the rear leg C122. When the front leg C121 and the rear leg C122 approach each other, the elastic pushing member C800 is pressed against the front leg C121 and the rear leg C122 and stores elastic potential energy. Therefore, when the front leg C121 and the rear leg C122 are allowed to rotate relative to each other, the rear leg C122 and / or the front leg C121 release the pressure on the elastic pusher C800. At this time, the elastic pusher C800 releases its elastic potential energy, pushing the front leg C121 and the rear leg C122 to pivot in a direction away from each other, causing them to separate quickly. Optionally, in this embodiment, a third traction member (such as a webbing, not shown in the figure of the third aspect) is connected between the seat frame C130 and the upper frame C111. After the front leg C121 and the rear leg C122 separate, the user releases the first pivot joint C113, and then rotates and pulls the upper frame C111 upward. The upper frame C111 will pivot relative to the lower frame C112 to unfold, while simultaneously causing the lower frame C112 to rotate around the first pivot axis in a direction away from the rear leg C122. During this process, the upper frame C111 will pull the seat frame C130 around the first pivot via the third traction component, moving it away from the front footrest C121 and the rear footrest C122. When the upper frame C111 and the lower frame C112 are fully extended, the seat frame C130 will rotate to the preset position, and the frame C100 will be in the extended state.

[0251] It should be noted that, in this embodiment, as the seat frame C130 pivots away from the front leg support C121 and the rear leg support C122, it gradually approaches and contacts the armrest frame C200, thereby pushing the armrest frame C200 to pivot. When the seat frame C130 is rotated to a preset position, the position of the armrest frame C200 is called the first open position. Therefore, the above process can also be understood as: when the frame C100 switches from a folded state to an unfolded state, the seat frame C130 gradually contacts the armrest frame C200 and pushes the armrest frame C200 from the folded position to the first open position. In this embodiment, when the frame C100 is in the unfolded state and the armrest frame C200 is in the first open position, the user can continue to rotate the armrest frame C200, pivoting it away from the seat frame C130 to the second open position. At this point, the trolley C10 enters normal use. In this embodiment, the first open position is closer to the seat frame C130 than the second open position.

[0252] Furthermore, it should be noted that in this embodiment, the trolley C10 also includes a locking mechanism C500 (see Figures 39 and 40, with the specific structure described below). This locking mechanism C500 is disposed between the handrail frame C200 and the frame C100 (specifically, the mounting base C1412). When the handrail frame C200 is in the second open position, the locking mechanism C500 engages with the handrail frame C200 to lock the handrail frame C200 in the second open position. In other words, the locking mechanism C500 is adapted to lock the handrail frame C200 in the second open position.

[0253] Referring to Figure 37, in one embodiment, the trolley C10 further includes a second elastic element C600 (such as a torsion spring or a spring sheet), which is adapted to abut against the armrest frame C200 to return the armrest frame C200 to the folded position. When the armrest frame C200 is in the second open position, the second elastic element C600 deforms and is in a deformed state. When the locking mechanism C500 releases the lock on the armrest frame C200, the second elastic element C600 gradually recovers its deformation and drives the armrest frame C200 to quickly return to the folded position. When the armrest frame C200 is in the folded position, the second elastic element C600 is in a natural state (i.e., an undeformed state). Therefore, during the process of the frame C100 switching from the unfolded state to the folded state, once the locking mechanism C500 releases the lock on the armrest frame C200, the armrest frame C200 can automatically return to the folded position under the action of the second elastic element C600, thus improving the convenience of the folding operation of the trolley C10. Of course, in other embodiments, the second elastic element C600 may also be omitted. After the locking mechanism C500 releases the lock on the handrail C200, the handrail C200 can pivot to the folded position by its own gravity.

[0254] Referring to Figures 37 and 38, in one embodiment, the stop mechanism C300 is disposed between the frame C100 and the handrail C200, adapted to prevent the handrail C200 from switching from a first open position to a second open position. Optionally, the stop mechanism C300 includes a first locking member C310. The first locking member C310 is disposed on the frame C100 (specifically, the mounting base C1412). Further, the stop mechanism C300 also includes a locking member C320, which is disposed on the handrail C200. When the handrail C200 is in the first open position, the first locking member C310 is located in the movement path of the handrail C200 switching from the first open position to the second open position. The first locking member C310 and the locking member C320 abut against each other in the movement direction of the handrail C200 switching from the first open position to the second open position, thereby preventing the handrail C200 from switching from the first open position to the second open position. By setting the stop mechanism C300, it is possible to effectively prevent children from accidentally lifting the armrest C200 due to misoperation (such as rotating the armrest C200) when the frame C100 is in the unfolded state and the armrest C200 is in the first open position. This prevents children's hands, arms, heads, or other parts from being put into the gap between the armrest C200 and the seat frame C130, effectively avoiding the risk of being pinched and improving the safety and reliability of the stroller C10.

[0255] Referring to Figures 37 and 38, in one embodiment, one of the first locking member C310 and the locking member C320 includes an engaging protrusion C314, and the other includes an engaging recess C320a. When the handrail C200 is in the first open position, the engaging protrusion C314 extends into the engaging recess C320a to abut against the side wall of the engaging recess C320a in the direction of movement of the handrail C200 from the first open position to the second open position, thereby preventing the handrail C200 from switching from the first open position to the second open position.

[0256] In this embodiment, the working principle of the stopping mechanism C300 will be explained using the example of the first locking member C310 including the engaging protrusion C314 and the matching locking member C320 including the engaging recess C320a. It should be noted that in this embodiment, the engaging protrusion C314 is one end of the first locking member C310.

[0257] Please refer to Figures 37 and 38. In one embodiment, the handrail C200 has a U-shaped structure, making it convenient for children to hold onto. Optionally, the two ends of the handrail C200 form pivot ends C200a, and the handrail C200 is pivotally connected to the mounting seats C1412 of the second pivot joints C140 on the left and right sides of the frame C100 through the two pivot ends C200a. More preferably, in this embodiment, the handrail C200 includes a handrail C210 and fixed seats C220 connected to both ends of the handrail C210. ​​The handrail C210 has a U-shaped structure. The two fixed seats C220 are the two pivot ends C200a, which are pivotally connected to the mounting seats C1412 of the second pivot joints C140 on the left and right sides, respectively. The engaging recess C320a is formed in the fixed seat C220 (i.e., the pivot end C200a). The structure and working principle of the stop mechanism C300 will be explained below using one side of the C100 frame (such as the left side) as an example.

[0258] In one embodiment, the first locking member C310 is movably disposed on the frame C100 (specifically, the mounting base C1412) and has a first position (see FIG. 38) and a second position (see FIG. 40). As shown in FIG. 38, when the first locking member C310 is in the first position, the engaging protrusion C314 extends into the engaging recess C320a to abut against the side wall of the engaging recess C320a. Thus, the armrest C200 remains in the first open position. As shown in FIGS. 39 and 40, when the first locking member C310 is in the second position, the engaging protrusion C314 disengages from the engaging recess C320a to release it from engagement. Optionally, in this embodiment, the first locking member C310 is slidably disposed on the mounting base C1412 to be switchable between the first and second positions. As shown in Figure 38, when the handrail C200 is in the first open position, the first locking member C310 is in the first position. In this way, the engaging protrusion C314 engages with the engaging recess C320a. That is, the engaging protrusion C314 abuts against the side wall of the engaging recess C320a in the direction of movement of the handrail C200 from the first open position to the second open position, so as to keep the handrail C200 in the first open position.

[0259] Referring to Figures 33, 37, and 38, in one embodiment, the mounting base C1412 includes a pivot portion C14121 and a connecting portion C14122. The pivot portion C14121 and the connecting portion C14122 can be integrally formed or connected by components such as screws. The connecting portion C14122 is a tubular structure, with its two ends connected to the rotating base C1411 and the lower frame C112, respectively. The pivot portion C14121 protrudes from the outside of the connecting portion C14122. In this embodiment, the pivot portion C14121 has a mounting cavity C14121a, and the connecting portion C14122 has a cavity C14122a, with the mounting cavity C14121a and the cavity C14122a communicating with each other. Optionally, the pivot portion C14121 is further provided with a socket C14121b, which communicates with the mounting cavity C14121a. The fixed seat C220 (i.e., the pivot end C200a) extends into the mounting cavity C14121a through the socket C14121b and is pivotally connected to the pivot portion C14121 of the mounting seat C1412 via the first pivot C700. Optionally, the second elastic element C600 is a torsion spring, which is sleeved outside the first pivot C700 and abuts between the fixed seat C220 and the pivot portion C14121.

[0260] Referring to Figures 38, 40, and 41, in this embodiment, when the handrail C200 is in the folded position, the fixing seat C220 is located within the mounting cavity C14121a. When the handrail C200 switches sequentially from the folded position to the first open position and the second open position, the fixing seat C220 pivots around the first pivot C700, and part of its structure gradually extends into the cavity C14122a of the connecting portion C14122. Optionally, the first locking member C310 is slidably disposed in the cavity C14122a of the connecting portion C14122, and its sliding direction is perpendicular to the axial direction of the first pivot C700. The engaging recess C320a is formed on the outer peripheral wall of the fixing seat C220 (i.e., the pivot end C200a). Optionally, the engaging recess C320a is formed on the outer peripheral wall of the fixing seat C220 that can extend into the cavity C14122a. Therefore, when the mounting base C1412 rotates about the first pivot C700, the engaging recess C320a can be opposite to the first locking member C310, and the first locking member C310 can be inserted into the engaging recess C320a and engage with it.

[0261] Referring to Figures 37 and 38, in one embodiment, the stop mechanism C300 further includes a first elastic element C330, which can be a spring, sheet metal, or other elastic element. In this embodiment, the first elastic element C330 is a spring, which abuts against the first locking element C310 and is adapted to provide an elastic restoring force to the first locking element C310, so that the first locking element C310 is held in a first position. Therefore, when the frame C100 is in the unfolded state and the armrest C200 is in the first open position, the engaging recess C320a is opposite to the first locking element C310, the first elastic element C330 pushes the first locking element C310 to the first position, and the first locking element C310 inserts into and engages with the engaging recess C320a. When the first locking element C310 is in the second position, the first elastic element C330 is compressed.

[0262] Referring to Figures 38 to 40, in this embodiment, the engaging recess C320a is a groove C321 formed on the outer peripheral wall of the fixed base C220 (i.e., the pivot end C200a), and the opening of the groove C321 is away from the first pivot C700. Optionally, the groove C321 (i.e., the engaging recess C320a) has a first guide slope C3211. When the handrail C200 is in the first open position, the engaging protrusion C314 abuts against the first guide slope C3211. When the handrail C200 switches from the first open position to the second open position, the engaging protrusion C314 is adapted to slide along the first guide slope C3211 to disengage from the engaging recess C320a. In other words, in this embodiment, the first guide slope C3211 not only abuts against the engaging protrusion C314 to restrict the handrail C200 from switching from the first open position to the second open position, but it is also adapted to abut against the engaging protrusion C314 to guide the first locking member C310 out of the engaging recess C320a, thereby allowing the handrail C200 to switch from the first open position to the second open position. In one embodiment, the recess C321 (i.e., the engaging recess C320a) also has a second guide slope C3212. When the handrail C200 switches from the first open position to the folded position, the engaging protrusion C314 is adapted to slide along the second guide slope C3212 to disengage from the engaging recess C320a. In other words, the second guide ramp C3212 is adapted to abut against the first locking member C310 to guide the first locking member C310 out of the engaging recess C320a, thereby allowing the armrest frame C200 to switch from the first open position to the folded position. More specifically, the first guide ramp C3211 and the second guide ramp C3212 are arranged opposite each other along the circumferential direction of the fixing base C220, and the first guide ramp C3211 and the second guide ramp C3212 are respectively two oppositely arranged sidewalls of the groove C321.

[0263] In this embodiment, the first open position is between the folded position and the second open position. Therefore, the rotation direction of the handrail C200 when switching from the first open position to the second open position is opposite to the rotation direction when switching from the first open position to the folded position. In this embodiment, the direction in which the handrail C200 rotates around the first pivot C700 from the first open position to the second open position is called the first rotation W1 (e.g., clockwise), and the direction in which the handrail C200 rotates around the first pivot C700 from the first open position to the folded position is called the second rotation W2 (e.g., counterclockwise). The first rotation W1 and the second rotation W2 are opposite. Therefore, when the handrail C200 is in the first open position, if the handrail C200 is rotated along the first rotation W1, the first guide ramp C3211 can abut against the engaging protrusion C314, guiding the engaging protrusion C314 out of the engaging recess C320a. If the handrail C200 is rotated along the second steering direction W2, the second guide slope C3212 can be used to abut against the engaging protrusion C314 to guide the engaging protrusion C314 out of the engaging recess C320a.

[0264] It should be noted that in this embodiment, when the armrest C200 is in the first open position, the armrest C200 can only be rotated to the second open position when the force (such as pushing or pulling) applied by the user to the armrest C200 is greater than the sum of the following forces: 1. The elastic force of the second elastic element C600 switching from its natural state to its deformed state and / or the weight of the armrest C200; 2. The elastic force generated by the first elastic element C330 when the first locking element C310 moves from the first position to the second position. However, since children have less strength, the force they apply is less than the sum of the above forces. Therefore, the armrest C200 can be stably maintained in the first open position under normal circumstances, and children cannot rotate the armrest C200. This design effectively prevents children's hands and other parts from being pinched by the gap between the armrest C200 and the seat frame C130, further improving the safety of using the stroller C10.

[0265] Furthermore, it should be noted that in this embodiment, the elastic restoring force of the second elastic member C600 when switching from the deformed state to the natural state and / or the weight of the armrest C200 are greater than the elastic force generated by the first elastic member C330 when the first locking member C310 moves from the first position to the second position. Therefore, when the armrest C200 is in the first open position, if the frame C100 is switched to the folded state, the seat frame C130 will no longer abut against the armrest C200. Thus, the second guide ramp C3212 can guide the engaging protrusion C314 to disengage from the engaging recess C320a, thereby allowing the armrest C200 to automatically switch from the first open position to the folded position (switching from Figure 38 to Figure 41). Of course, in other embodiments, the elastic restoring force of the second elastic member C600 when switching from the deformed state to the natural state and / or the weight of the handrail C200 may also be less than the elastic force generated by the first elastic member C330 when the first locking member C310 moves from the first position to the second position. Thus, when the handrail C200 needs to be switched to the folded position, it can be driven from the first open position to the folded position by an external force (such as a push or pull applied by the user).

[0266] Referring to Figures 37, 38, and 40, in one embodiment, the locking mechanism C500 includes a second locking member C510 and a locking recess C520. The second locking member C510 is movably disposed on the frame C100, and the locking recess C520 is disposed on the armrest frame C200. Optionally, the second locking member C510 is slidably disposed in the cavity C14122a of the connecting portion C14122, and the locking recess C520 is formed on the outer peripheral wall of the fixing seat C220. More preferably, the locking recess C520 is formed on the outer peripheral wall of the fixing seat C220 extending into the cavity C14122a. Therefore, when the mounting base C1412 rotates about the first pivot C700 until the handrail C200 is in the second open position, the locking recess C520 is located in the cavity C14122a and is opposite to the second locking member C510. The second locking member C510 can be inserted into the locking recess C520 to lock in place. In this way, the handrail C200 can be restricted to the second open position. When the second locking member C510 is operated to disengage from the locking recess C520, the handrail C200 can automatically switch from the second open position to the first open position and then to the folded position under the elastic restoring force of the second elastic member C600 and / or gravity.

[0267] Referring to Figures 37 and 38, in one embodiment, the frame C100 further includes a first bracket C160. Optionally, the first bracket C160 is installed within the cavity C14122a of the connecting portion C14122, and the second locking member C510 is slidably disposed on the first bracket C160, providing support for the second locking member C510. Further, in this embodiment, the locking mechanism C500 also includes a third elastic member C540, which can be an elastic member such as a spring or a sheet. The third elastic member C540 abuts against the second locking member C510 and the first bracket C160, thereby ensuring that the second locking member C510 consistently tends to insert into the locking recess C520. It should be noted that in this embodiment, the first locking member C310 is slidably disposed on the first bracket C160, and the first elastic member C330 abuts against the first locking member C310 and the first bracket C160. The first bracket C160 simultaneously provides support for both the first locking member C310 and the second locking member C510. Of course, in other embodiments, the first locking member C310 may also be provided on other support structures, and no specific restrictions are imposed here.

[0268] Referring to Figure 41, in this embodiment, when the armrest frame C200 is in the folded position, the fixing seat C220 retracts from the cavity C14122a and is spaced apart from the engaging protrusion C314 of the first locking member C310. At this time, under the force of the first elastic member C330, the first locking member C310 will cause the engaging protrusion C314 to extend into the rotation path of the fixing seat C220. Optionally, the engaging protrusion C314 is provided with a pushing slope C311. Referring to Figures 38 and 41, during the process of the seat frame C130 abutting against the armrest frame C200 and driving the armrest frame C200 to rotate from the folded position to the first open position, the fixing seat C220 rotates around the first pivot C700, and part of its structure gradually extends into the cavity C14122a and approaches the engaging protrusion C314. Once the fixed base C220 contacts the engaging protrusion C314, if the fixed base C220 continues to rotate, the fixed base C220 will push the engaging protrusion C314 away from the fixed base C220 by the pushing inclined surface C311, causing it to exit the rotation path of the fixed base C220. This design prevents the engaging protrusion C314 from obstructing the rotation of the fixed base C220, thus ensuring that the handrail C200 can smoothly switch from the folded position to the first open position.

[0269] The following diagrams briefly illustrate the folding and unfolding process of the C10 stroller.

[0270] Please refer to Figure 34. When the trolley C10 is folded, the frame C100 is in a folded state, and the armrest C200 is in a stowed position. In this embodiment, when the frame C100 is folded, the first pivot joint C113 and the wheels (i.e., the front wheel C151 and the rear wheel C152) are on the same horizontal plane. When the trolley C10 is placed on a horizontal surface, the wheels and the first pivot joint C113 each form a support point with the ground, and the two cooperate to support the trolley C10 so that the trolley C10 can be placed upright.

[0271] Referring to Figures 34, 38 to 41, when the user needs to unfold the trolley C10, the frame C100 needs to be switched from the folded state to the unfolded state, and the handrail C200 needs to be switched from the folded position to the second open position. The specific operation is as follows: First, release the locking mechanism C400 from the handrail C110 and the front leg C121, allowing the front leg C121 and the rear leg C122 to pivot. At this time, the elastic pusher C800 pushes the front leg C121 and the rear leg C122 to quickly separate, so that the front leg C121 and the rear leg C122 form a triangular structure with the ground (switching from Figure 34 to Figure 41), to prevent the frame C100 from tipping over or falling over when unfolded. Subsequently, release the first pivot joint C113 to release its locking to the upper handrail C111 and the lower handrail C112. During the rotation of the upper frame C111 and its upward pulling, the third traction component causes the seat frame C130 to pivot away from the front footrest C121. The upper frame C111 also pulls the lower frame C112 away from the rear footrest C122. This allows the seat frame C130 and the armrest frame C200 to move closer together (switching from Figure 41 to Figure 38) until they contact each other. At this point, the frame C100 is not fully extended. As the frame C100 continues to extend, the seat frame C130 pushes against the armrest frame C200, causing it to pivot along the first steering direction W1, gradually switching from the folded position to the first open position. When the frame C100 is fully extended, i.e., when the frame C100 is in the extended state, the seat frame C130 pivots to the preset position, and the armrest frame C200 is in the first open position (see Figure 38). At this time, the engaging protrusion C314 of the first locking member C310 is opposite to the engaging recess C320a. The first locking member C310, with the aid of the first elastic member C330, allows the engaging protrusion C314 to automatically extend into the engaging recess C320a, thus keeping the handrail C200 in the first open position. As described above, when the handrail C200 is in the first open position, only when the force applied to the handrail C200 is greater than the sum of the elastic force of the second elastic member C600 switching from its natural state to its deformed state, the weight of the handrail C200, and the elastic force generated by the first elastic member C330 when the first locking member C310 moves from the first position to the second position, can the handrail C200 deviate from the first open position to switch to the second open position. Therefore, when the handrail C200 is in the first open position, the user (meaning an adult) only needs to apply a normal force to the handrail C200 to push it to continue rotating along the first steering direction W1 to the second open position. As shown in Figures 39 and 40, when the handrail C200 is in the second open position, the second locking member C510 is opposite to the locking recess C520. With the help of the third elastic member C540, the second locking member C510 can automatically insert into the locking recess C520 and remain in the inserted state.In this way, the armrest C200 can be stably held in the second open position, and the trolley C10 can be used normally.

[0272] Please refer to Figures 34, 38 to 41. When the user needs to fold the trolley C10, the frame C100 needs to be switched from the unfolded state to the folded state, and the armrest C200 needs to be switched from the second open position to the folded position. The specific operation is as follows: First, release the locking mechanism C500 from the armrest C200. In this way, the armrest C200 can automatically pivot sequentially towards the first open position along the second steering W2 with the help of the second elastic element C600. Alternatively, when the second elastic element C600 is omitted, the armrest C200 can pivot sequentially towards the first open position along the second steering W2 using gravity. Subsequently, release the first pivot joint C113 and the second pivot joint C140 so that the frames of the trolley C100 are folded relative to each other and close together. During the folding process of the frame C100, the seat frame C130 gradually moves away from the armrest frame C200. The armrest frame C200, aided by the elastic force of the second elastic element C600 or its own weight, automatically pivots from the first open position to the folded position. It should be noted that in this embodiment, the user can first release the locking mechanism C500, and then release the first pivot joint C113 and the second pivot joint C140. Of course, in other embodiments, the user can simultaneously release the first pivot joint C113, the second pivot joint C140, and the locking mechanism C500. Alternatively, the user can first release the first pivot joint C113, and then release the second pivot joint C140 and the locking mechanism C500; or, the user can first release the first pivot joint C113 and the locking mechanism C500, and then release the second pivot joint C140. No specific limitations are imposed here.

[0273] A second embodiment of the third aspect of the present invention also provides a trolley C10, which is similar to the first embodiment of the third aspect described above, including components such as a frame C100, a handrail frame C200, and a stop mechanism C300. The trolley C10 of this embodiment can be considered a variation of the trolley C10 of the first embodiment of the third aspect described above. Therefore, unless otherwise specified, the structure of the components and the connection relationships between the components in this embodiment can be referred to the description in the first embodiment of the third aspect described above. The following mainly describes the differences between this embodiment and the first embodiment of the third aspect described above.

[0274] In this embodiment, the structure and location of the stop mechanism C300 are slightly different from those in the first embodiment of the third aspect. In this embodiment, the first locking member C310 includes an engaging protrusion C314, which is one end of the first locking member C310 and is elastic. The first locking member C310 is fixed to the frame C100 (specifically, the mounting base C1412) to fix the engaging protrusion C314 relative to the frame C100. Optionally, in this embodiment, the first locking member C310 is formed on the inner wall of the mounting cavity C14121a. More specifically, the first locking member C310 protrudes along the axial direction of the first pivot C700, so that the protrusion direction of the engaging protrusion C314 can be considered parallel to the axial direction of the first pivot C700. The engaging recess C320a can be a through hole formed on the fixed base C220. The axial direction of the through hole is parallel to the axial direction of the first pivot C700, and the through hole is offset from the first pivot C700 in a direction parallel to the axial direction of the first pivot C700. When the handrail C200 is in the first open position, the engaging protrusion C314 is inserted into the through hole to keep the handrail C200 in the first open position. In this embodiment, the handrail C200 can be rotated to the second open position only when the force (such as pushing or pulling) applied by the user to the handrail C200 is greater than the sum of the following forces: 1. The elastic force of the second elastic element C600 switching from the natural state to the deformed state and / or the gravity of the handrail C200; 2. The elastic deformation force generated when the engaging protrusion C314 exits from the through hole.

[0275] It should be noted that the process and principle of the handrail frame C200 switching from the folded position to the first open position and the second open position in this embodiment are roughly similar to those in the first embodiment of the third aspect mentioned above, so they will not be repeated here.

[0276] Furthermore, it should be noted that in other embodiments, the structure of the stop mechanism C300 may include two or more types. For example, the structures of the stop mechanism C300 in the first embodiment of the third aspect and the second embodiment of the third aspect may be used simultaneously, that is, the two types of stop mechanisms C300 can coexist and function synchronously.

[0277] Please refer to Figures 42 to 45. A third embodiment of the third aspect of the present invention also provides a trolley C10, which is similar to the first embodiment of the third aspect described above, including components such as a frame C100, a handrail frame C200, and a stop mechanism C300. The trolley C10 of this embodiment can be considered a variation of the trolley C10 of the first embodiment of the third aspect described above. Therefore, unless otherwise specified, the structure of the components and the connection relationships between the components in this embodiment can be referred to the description in the first embodiment of the third aspect described above. The following mainly describes the differences between this embodiment and the first embodiment of the third aspect described above.

[0278] In this embodiment, the structure and position of the stop mechanism C300 differ from those in the first embodiment of the third aspect. Referring to Figures 46 and 47, in this embodiment, the first locking member C310 is pivotally connected to the frame C100 (specifically, the mounting base C1412) to have a first position (see Figure 46) and a second position (see Figure 47). Similarly, in this embodiment, when the first locking member C310 is in the first position, the engaging protrusion C314 of the first locking member C310 extends into the engaging recess C320a. When the first locking member C310 is in the second position, the engaging protrusion C314 of the first locking member C310 disengages from the engaging recess C320a. Similarly, in this embodiment, when the armrest C200 is in the first open position, the first locking member C310 is in the first position, thus restricting the armrest C200 from switching to the second open position. When a user needs to switch the handrail C200 from the first open position to the second open position, the first locking element C310 must first be switched to the second position.

[0279] Referring to Figures 48 to 50, in one embodiment, the engaging recess C320a is an arc-shaped hole C322, and the center of the arc of the arc-shaped hole C322 is located at the first pivot C700. As shown in Figures 46 and 47, the first locking member C310 is located on one side of the fixed seat C220 (i.e., the pivot end C200a) along the axial direction of the first pivot C700, and the engaging protrusion C314 is adapted to extend into or retract from the arc-shaped hole C322. Optionally, as shown in Figures 46, 49, and 50, when the first locking member C310 is in the first position, the engaging protrusion C314 extends into the arc-shaped hole C322. As shown in Figures 47 and 51, when the first locking member C310 is in the second position, the engaging protrusion C314 retracts from the arc-shaped hole C322. Optionally, referring to Figures 49 and 50, in this embodiment, when the armrest C200 is in the folded position, the engaging protrusion C314 extends circumferentially along the arcuate hole C322 and is located near the first end of the arcuate hole C322 (not shown in the figure of the third aspect). When the armrest C200 is pushed by the seat frame C130 to pivot along the first steering W1 to the first open position, the engaging protrusion C314 extends circumferentially along the arcuate hole C322 and is located at the second end C3222 of the arcuate hole C322, abutting against the hole wall of the second end C3222. In this way, the armrest C200 can be restricted from continuing to pivot along the first steering W1. In this case, if the first locking member C310 is switched to the second position, that is, the engaging protrusion C314 is disengaged from the arcuate hole C322, the armrest C200 can continue to pivot along the first steering W1 to the second open position. It should be noted that in this embodiment, when the handrail C200 is in the folded position, the engaging protrusion C314 can just abut against the wall of the first end of the arc-shaped hole C322; or, the engaging protrusion C314 can be spaced apart from the wall of the first end of the arc-shaped hole C322, without specific limitations. In this embodiment, the rotation angle of the handrail C200 between the folded position and the first open position is less than or equal to the arc corresponding to the arc-shaped hole C322. This ensures that the handrail C200 can freely switch between the folded position and the first open position. When the handrail C200 switches between the first open position and the folded position, the first locking member C310 remains in the first position and reciprocates within the arc-shaped hole C322. Alternatively, in this embodiment, as shown in Figures 48 and 49, one end of the arc-shaped hole C322 extends through the fixing seat C220 (i.e., the pivot end C200a) along the circumferential direction of the arc-shaped hole C322 to form an opening C3221. Specifically, the first end of the arc-shaped hole C322 is penetrated to form the opening C3221. When the handrail frame C200 is in the folded position, the engaging protrusion C314 is located at or moves from the opening C3221 to the outside of the pivot end C200a.When the handrail C200 is in the first open position, the engaging protrusion C314 abuts against the wall of the arc-shaped hole C322 at the end away from the opening 3221 (i.e., the second end C3222) (see Figure 49).

[0280] Referring to Figures 46 and 47, in one embodiment, the first locking member C310 includes a release portion C312, a pivot portion C313, and an engaging protrusion C314 connected in sequence. The pivot portion C313 is pivotally connected to the frame C100 (specifically, the mounting base C1412). When the first locking member C310 is in a first position, the release portion C312 protrudes from the surface of the frame C100 (specifically, the mounting base C1412). When the first locking member C310 is in a second position, the release portion C312 does not protrude from the surface of the frame C100 (specifically, the mounting base C1412). The release portion C312 is adapted to be operated to switch the first locking member C310 from the first position to the second position. In this embodiment, the pivot portion C313 is located between the release portion C312 and the engaging protrusion C314, which makes the first locking member C310 roughly in a "seesaw" structure when pivoting. That is, when the release portion C312 is pressed to bring the release portion C312 closer to the fixed seat C220, the engaging protrusion 3C14 will lift up to disengage from the engaging recess C320a.

[0281] Referring to Figures 46 and 47, in one embodiment, the pivot portion C14121 of the mounting base C1412 is further provided with a through hole C14121c (see Figures 42 and 43), which communicates with the mounting cavity C14121a. When the first locking member C310 is in the first position, at least part of the release portion C312 passes through the through hole C14121c to extend out of the mounting cavity C14121a, protruding from the surface of the mounting base C1412 (specifically, the pivot portion C14121) (see Figures 42 and 46). This allows the user to press the release portion C312 to disengage the engaging protrusion C314 from the arc-shaped hole C322. When the first locking member C310 switches to the second position, the engaging protrusion C314 disengages from the arc-shaped hole C322 to release its constraint. Thus, the handrail C200 can freely pivot to the second open position. In this embodiment, when the handrail C200 is in the second open position, the engaging protrusion C314 abuts against the surface of the fixing seat C220, while the releasing part C312 remains retracted from the through hole C14121c into the mounting cavity C14121a. The releasing part C312 can be flush with the surface of the pivoting part C14121 or recessed relative to the surface of the pivoting part C14121; no specific limitation is made here. In this embodiment, the design of the releasing part C312 protruding from the surface of the pivoting part 14121 when the handrail C200 is in the first open position not only facilitates user operation but also provides an intuitive position indicator through physical shape differences, helping the user identify the current position of the handrail C200.

[0282] In one embodiment, the first locking member C310 can be mounted in the mounting cavity C14121a of the pivot portion C14121 via other components (such as the second bracket C900). Of course, in other embodiments, the first locking member C310 can also be directly mounted in the mounting cavity C14121a via a shaft or pin, etc., without specific limitations. Optionally, in this embodiment, as shown in FIG48, the mounting cavity C14121a is provided with a second bracket C900, and the first locking member C310 is pivotally connected to the second bracket C900 via a shaft or pin, etc. Further, referring to FIGS. 46 to 48, in this embodiment, the first elastic member C330 abuts between the release portion C312 and the second bracket C900. During the process of switching the handrail C200 from the second open position to the first open position and the folded position, when the arc-shaped hole C322 is opposite to the engaging protrusion C314, the surface of the fixing seat C220 no longer abuts against the engaging protrusion C314. The first elastic element C330 will then drive the release part C312 to pass through the through hole C14121c again to protrude from the surface of the mounting seat C1412. Correspondingly, the engaging protrusion C314 is reinserted into the arc-shaped hole C322.

[0283] The aforementioned trolley C10 has at least the following technical effects:

[0284] The stroller C10 significantly enhances its versatility through the foldable and unfoldable design of its frame C100. For example, when the stroller C10 needs to be stored or transported, it can be folded to reduce its size and facilitate storage or transport. When the stroller C10 is needed, it can be unfolded to provide a comfortable seating space for children, effectively reducing the burden on parents during travel. The stroller C10 in this application also features a stop mechanism C300, which effectively prevents children from accidentally pushing the armrest C200 to the second open position. This design physically limits the formation of a dangerous gap between the armrest C200 and the seat frame C130, avoiding the risk of children's limbs getting stuck in the gap, while retaining the functionality required for parents to manually unlock and switch to the second open position.

[0285] 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.

[0286] The embodiments described above are merely illustrative 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 appended claims.

Claims

1. A trolley, characterized in that, include: A vehicle frame, including a seat frame, the vehicle frame having an unfolded state; The armrest is pivotally connected to the vehicle frame. When the vehicle frame is in the unfolded state, the armrest has a first open position and a second open position, and the first open position is closer to the seat frame than the second open position. as well as A stop mechanism is provided between the vehicle frame and the handrail frame, which is adapted to prevent the handrail frame from switching from the first open position to the second open position.

2. The trolley according to claim 1, characterized in that, The stopping mechanism includes: A first locking element is provided on the vehicle frame; and A locking mechanism is provided on the handrail frame; When the handrail is in the first open position, the first locking member is located in the movement path of the handrail switching from the first open position to the second open position. The first locking member and the locking member abut against each other in the movement direction of the handrail switching from the first open position to the second open position to prevent the handrail from switching from the first open position to the second open position.

3. The trolley according to claim 2, characterized in that, One of the first locking member and the locking member includes an engaging protrusion, and the other includes an engaging recess; when the handrail is in the first open position, the engaging protrusion extends into the engaging recess to abut against the side wall of the engaging recess in the direction of movement of the handrail switching from the first open position to the second open position.

4. The trolley according to claim 3, characterized in that, The first locking member includes an engaging protrusion, and the locking member includes an engaging recess; The first locking member is movably disposed on the vehicle frame and has a first position and a second position. When the first locking member is in the first position, the engaging protrusion extends into the engaging recess to abut against the side wall of the engaging recess, and the armrest is held in the first open position. When the first locking member is in the second position, the engaging protrusion retracts from the engaging recess.

5. The trolley according to claim 4, characterized in that, The first locking member is slidably disposed on the frame to have the first position and the second position.

6. The trolley according to claim 5, characterized in that, The handrail has a pivot end, which is pivotally connected to the vehicle frame via a first pivot. The engaging recess is formed on the outer peripheral wall of the pivot end, and the sliding direction of the first locking member is perpendicular to the axial direction of the first pivot.

7. The trolley according to claim 4, characterized in that, The engaging recess has a first guide slope. When the handrail is in the first open position, the engaging protrusion abuts against the first guide slope. When the handrail switches from the first open position to the second open position, the engaging protrusion is adapted to slide along the first guide slope to exit the engaging recess.

8. The trolley according to claim 4, characterized in that, The first locking member is pivotally connected to the frame to have the first position and the second position.

9. The trolley according to claim 8, characterized in that, The handrail has a pivot end, which is pivotally connected to the vehicle frame via a first pivot. The engaging recess is located at the pivot end. The first locking member is located on one side of the pivot end along the axial direction of the first pivot. The engaging protrusion is adapted to extend into or retract from the engaging recess.

10. The trolley according to claim 8, characterized in that, The first locking member includes a release portion, a pivot portion, and an engaging protrusion connected in sequence. The pivot portion is pivotally connected to the vehicle frame. When the first locking member is in the first position, the release portion protrudes from the surface of the vehicle frame. When the first locking member is in the second position, the release portion does not protrude from the surface of the vehicle frame. The release portion is adapted to be operated to switch the first locking member from the first position to the second position.

11. A limiting mechanism for a vehicle, characterized in that, include: A mounting bracket is used to fix the device to the body of the first vehicle. and The engaging component is rotatably mounted on the fixed base and can be switched between a first position and a second position; The engaging member can be held in either the first or the second position relative to the fixed seat by engaging with the fixed seat. When the engaging member is in the first position, it can restrict the second vehicle body onto the first vehicle body. When the engaging member is in the second position, it releases the restriction on the second vehicle body onto the first vehicle body.

12. The limiting mechanism according to claim 11, characterized in that, One of the fixing base and the engaging member is provided with an engaging protrusion, and the other of the fixing base and the engaging member is provided with an engaging recess that can cooperate with the engaging protrusion. When the engaging member is in the first position or the second position, the engaging protrusion and the engaging recess are engaged.

13. The limiting mechanism according to claim 12, characterized in that, The engaging recess includes a first engaging recess and a second engaging recess. When the engaging member is in the first position, the engaging protrusion and the first engaging recess engage with each other. When the engaging member is in the second position, the engaging protrusion and the second engaging recess engage with each other. Or The engaging protrusion includes a first engaging protrusion and a second engaging protrusion. When the engaging member is in the first position, the first engaging protrusion engages with the engaging recess. When the engaging member is in the second position, the second engaging protrusion engages with the engaging recess.

14. The limiting mechanism according to claim 12, characterized in that, The engaging recess includes a first engaging recess and a second engaging recess. When the engaging member is in the first position, the engaging protrusion and the first engaging recess engage with each other. When the engaging member is in the second position, the engaging protrusion and the second engaging recess engage with each other. The fixed base is provided with a locking protrusion, and the locking member is pivotally connected to the fixed base via a pivot shaft. The locking member has an arc-shaped locking surface spaced apart from the pivot shaft, and the locking surface has a first locking recess and a second locking recess spaced apart circumferentially along the locking surface.

15. The limiting mechanism according to claim 14, characterized in that, The engagement surface is also provided with an avoidance groove, which is located between the first engagement recess and the second engagement recess. The groove walls at both ends of the avoidance groove along the circumference of the engagement surface form a pushing slope, which is used to abut against the engagement protrusion.

16. The limiting mechanism according to claim 11, characterized in that, One of the fixing base and the engaging member is movably provided with a locking pin, and the other of the fixing base and the engaging member is provided with an engaging recess; The locking pin is switchable between a second locking position and a second unlocking position. When the locking pin is in the second locking position, it is adapted to engage with the engagement recess to lock the engaging member in the first position or the second position. When the locking pin is in the second unlocking position, it is adapted to disengage from the engagement recess to release the locking of the engaging member in the first position or the second position.

17. The limiting mechanism according to claim 16, characterized in that, The limiting mechanism further includes a second reset member, which is adapted to apply force to the locking pin to switch it to the second locking position, and the other of the fixing seat and the engaging member is adapted to push against the locking pin to switch it to the second unlocking position.

18. The limiting mechanism according to claim 11, characterized in that, The fixing seat has a first limiting part and a second limiting part. When the engaging member is in the first position, the engaging member abuts against the first limiting part. When the engaging member is in the second position, the engaging member abuts against the second limiting part.

19. A vehicle, characterized in that, include: First vehicle body; The second vehicle body is detachably mounted on the first vehicle body; as well as The limiting mechanism as described in any one of claims 11 to 18.

20. The vehicle according to claim 19, characterized in that, The second vehicle body has an abutment portion. When the engaging member is in the first position, the engaging member abuts against the abutment portion to restrict the second vehicle body to the first vehicle body. When the engaging member is in the second position, the engaging member moves away from the abutment portion to release the restriction of the second vehicle body on the first vehicle body. The first vehicle body has a first joint portion, and the second vehicle body has a second joint portion. The second joint portion and the abutment portion are respectively located on the front and rear sides or left and right sides of the second vehicle body. The second joint portion is adapted to abut or engage with the first joint portion.

21. A trolley, characterized in that, include: A frame, comprising at least three frame components that engage with each other; A first locking mechanism is provided on the vehicle frame and is capable of selectively locking the mating position between two of the at least three vehicle frame components; A second locking mechanism is provided on the vehicle frame and is capable of selectively locking the mating position between two of the at least three vehicle frame assemblies, wherein at least one of the two vehicle frame assemblies locked by the second locking mechanism and the two vehicle frame assemblies locked by the first locking mechanism does not overlap with each other; as well as An actuation mechanism is provided on the vehicle frame and drives and cooperates with the first locking mechanism and the second locking mechanism. The actuation mechanism is activated to release the first locking mechanism and the second locking mechanism simultaneously.

22. The trolley according to claim 21, characterized in that, The frame includes a first frame assembly, a second frame assembly, and a third frame assembly that are coupled to each other. The first locking mechanism selectively locks the mating position between the first frame assembly and the second frame assembly; The second locking mechanism selectively locks the mating position between the second frame assembly and the third frame assembly.

23. The trolley according to claim 21, characterized in that, The first locking mechanism and the second locking mechanism are independent of each other. The actuation mechanism includes at least two actuation transmission mechanisms, which cooperate with the first locking mechanism and the second locking mechanism respectively. By actuating the actuation mechanism, the at least two actuation transmission mechanisms simultaneously release the first locking mechanism and the second locking mechanism respectively.

24. The trolley according to claim 22, characterized in that, The second frame assembly is a handframe, which includes an upper handframe, a lower handframe, and a first pivot joint disposed between the upper handframe and the lower handframe. The upper handframe rotates about the first pivot joint relative to the lower handframe.

25. The trolley according to claim 24, characterized in that, The actuation mechanism includes an actuation linkage mechanism and two actuation transmission mechanisms. The two actuation transmission mechanisms are both connected to the actuation linkage mechanism. The actuation linkage mechanism passes through the first pivot joint and is connected to the upper frame. The two actuation transmission mechanisms are respectively driven and cooperated with the first locking mechanism and the second locking mechanism. When the upper frame rotates around the first pivot joint toward the lower frame, the actuation linkage mechanism bends around the first pivot joint to drive the two actuation transmission mechanisms to move synchronously, so as to simultaneously drive the first locking mechanism and the second locking mechanism to release.

26. The trolley according to claim 22, characterized in that, The first frame assembly is a handrail frame, the second frame assembly is a rider frame, and the third frame assembly is a footrest. The footrest and the handrail frame are respectively pivotally connected to the rider frame. The first locking mechanism acts between the handrail and the handrail, and the second locking mechanism acts between the handrail and the footrest.

27. The trolley according to claim 26, characterized in that, The handrail has a folded position and an unfolded position; The first locking mechanism includes a first locking member and a locking recess. The first locking member is movably disposed on the handrail and connected to the actuation mechanism. The handrail is provided with the locking recess. When the first locking member is inserted into the locking recess, the handrail is restricted from rotating to the folded position. When the first locking member is removed from the locking recess, the handrail is allowed to rotate to the folded position.

28. The trolley according to claim 26, characterized in that, The handrail is provided with a pushing part, which has an arc-shaped structure. During the process of the handrail switching from the folded position to the unfolded position, the pushing part guides the first locking member to insert into the locking recess.

29. The trolley according to claim 26, characterized in that, The trolley also includes a second pivot joint, which is connected between the handframe and the footframe, and the handframe is rotatable relative to the footframe about the second pivot joint; The second locking mechanism is movably mounted on the second pivot joint and has a locked state and an unlocked state; When the second locking mechanism is in the locked state, the handframe and the footframe are restricted from rotating relative to each other about the second pivot joint; When the second locking mechanism is in the unlocked state, the handframe and the footframe are allowed to rotate relative to each other about the second pivot joint.

30. The trolley according to claim 29, characterized in that, The second locking mechanism includes a locking component, a locking groove group, and a second driving member. The second pivot joint is provided with the locking groove group. The locking component is movably disposed within the second pivot joint and is adapted to lock and engage with the locking groove group to restrict the relative rotation of the rider frame and the footrest. The second driving member drives and engages with the locking component to drive the locking component to lock and engage with the locking groove group. The actuation mechanism is connected to the second driving member.

Images