Carrier

Abstract

The invention relates to a carrier which comprises a foldable bottom support assembly, a connecting frame and a linkage piece, the connecting frame is rotatably connected to the bottom support assembly around a first axis, the linkage piece is connected between the connecting frame and the bottom support assembly, the bottom support assembly comprises a first support and a second support, and the upper portions of the first support and the second support are rotatably connected. The connecting rod assembly is connected between the first support and the second support and can be folded, the linkage piece is rotationally connected to the connecting frame around a second axial lead, the first axial lead and the second axial lead deviate from each other, and in the process that the connecting frame is turned over and folded relative to the bottom support assembly, the linkage piece can rotate around the first axial lead. The linkage piece drives the connecting rod assembly to be folded so that the first support and the second support can rotate to be folded, the bottom support assembly can be folded, the stroller can be converted from the unfolded state to the folded state, folding steps are few, and operation is convenient.

Description

Technical Field

[0001] This invention relates to a vehicle, and more particularly to a foldable vehicle. Background Technology

[0002] In existing technologies, most vehicles such as trolleys and chairs adopt a foldable structure, allowing users to fold them up for easy storage or carrying when not in use. Currently, the structures and shapes of vehicles on the market vary widely, as do their folding principles. Simplifying the structure and unfolding / folding operations of vehicles while maintaining good load-bearing capacity has always been a goal pursued by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a vehicle with a novel structure and folding principle.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a carrier having an unfolded state and a folded state, the carrier including a foldable base support assembly, a connecting frame rotatably connected to the base support assembly about a first axis, and a linkage connecting the connecting frame and the base support assembly. The base support assembly includes a first support and a second support rotatably connected at their upper parts, and a foldable connecting rod assembly connected between the first support and the second support. The linkage is rotatably connected to the connecting frame about a second axis, the first axis and the second axis being offset from each other. During the process of the connecting frame flipping and folding relative to the base support assembly, the linkage drives the connecting rod assembly to fold, causing the first support and the second support to rotate and fold relative to each other.

[0005] Preferably, the linkage assembly includes a first linkage and a second linkage. A first end of the first linkage is rotatably connected to a second end of the second linkage. A third end of the first linkage is rotatably connected to a first bracket. A fourth end of the second linkage is rotatably connected to a second bracket. The first end and the third end are two ends spaced apart along the length of the first linkage. The second end and the fourth end are two ends spaced apart along the length of the second linkage. When the vehicle is in a folded state, the first linkage and the second linkage are retracted between the first bracket and the second bracket. The linkage is movably connected to either the first linkage or the second linkage.

[0006] In some embodiments, when the vehicle is in an unfolded state, the first end is higher than the third end, the second end is higher than the fourth end, the linkage is rotatably connected to the first end or rotatably connected to the second end, or the linkage is rotatably connected to the first end and the second end about the same axis, wherein during the process of the connecting frame flipping and retracting relative to the bottom support assembly, the linkage drives the first end and the second end to move upward.

[0007] In some embodiments, when the vehicle is in an unfolded state, the lower part of the connecting frame is rotatably connected to the first bracket or the second bracket, and the first axis is located above the second axis; when the vehicle is in a folded state, the second axis is located above the first axis.

[0008] In some embodiments, the first end and the second end are always located below the first axis.

[0009] In some embodiments, the upper part of the first bracket, the upper part of the second bracket, and the connecting frame are rotatably connected about the first axis.

[0010] In some embodiments, the base support assembly further includes a support member and a swing member, the support member being rotatably connected to the first support or rotatably connected to the second support, and the swing member being movably connected between the support member and the linkage assembly, wherein when the linkage assembly is folded, the swing member drives the support member to retract relative to the first support.

[0011] In some embodiments, one end of the swing member is rotatably connected to the support member, and the other end of the swing member is rotatably connected to the first link or the second link.

[0012] In some embodiments, the support member is rotatably connected to the first bracket and the second bracket about the same axis, and the swing member is rotatably connected to the first end and the second end about the same axis.

[0013] In some embodiments, the support member, the first bracket, the second bracket, and the connecting frame are rotatably connected around the first axis, and the swing member, the linkage member, the first end, and the second end are rotatably connected around the third axis. The first axis is located above the third axis. In the left-right direction, the swing member is located inside the linkage member. When the vehicle is in the unfolded state, the swing member is blocked by the linkage member in the left-right direction.

[0014] Preferably, the carrier is a trolley, and the carrier further includes a first wheel assembly disposed at the bottom of the first support and a second wheel assembly disposed at the bottom of the second support. The first wheel assembly includes a wheel seat, a wheel frame with a rotating shaft, and a wheel body rotatably mounted on the wheel frame around the wheel shaft. The wheel seat is connected to the first support, and the rotating shaft is rotatably connected to the wheel seat around its own axis. The trolley is also provided with a restraining device, which has a restraining member movably connected to the rotating shaft. In a first state, the restraining device disengages from the rotating shaft, allowing the wheel frame to rotate relative to the wheel seat around the rotating shaft. In a second state, the restraining member cooperates with the rotating shaft to restrict the rotation of the rotating shaft, fixing the wheel frame relative to the wheel seat.

[0015] In some embodiments, the constraint member is provided with a constraint portion, and the rotating shaft is provided with a mating portion. In the first state, the constraint portion is disengaged from the mating portion; in the second state, the constraint portion and the mating portion are engaged, and the wheel axle extends along a predetermined direction.

[0016] The constraint member is also provided with a guide portion, which is connected to the constraint portion in the circumferential direction. During the process of the constraint device changing from the first state to the second state, when the rotating shaft rotates, the mating portion moves along the guide portion until it engages with the constraint portion.

[0017] In some embodiments, the constraint member is slidably sleeved on the rotating shaft along the axial direction of the rotating shaft, the mating part is a positioning protrusion extending radially along the rotating shaft, the constraint part is a positioning groove into which the positioning protrusion can be mated, and the guide part is a guide surface extending helically around the axis of rotation of the rotating shaft.

[0018] In some embodiments, the guide surface has two sets connected circumferentially, each set of the guide surface having a first end and a second end disposed at opposite ends in the length direction, the first ends of the two sets of guide surfaces being connected to the positioning groove, the second ends of the two sets of guide surfaces being connected, and the guide surface extending from the first end to the second end along the axial direction of the rotation axis away from the positioning groove.

[0019] In some embodiments, the constraint member is movably disposed along the axial direction of the rotation axis, the constraint device is in the first state and the constraint member is in the first position; the constraint member is in the second state and the constraint member is in the second position, the constraint device further includes an elastic member that provides the force required for the constraint member to move from the first position to the second position, and a drive component for driving the constraint member to move from the second position to the first position.

[0020] In some embodiments, the drive assembly includes a bracket rotatably disposed on the wheel seat, the bracket having a pushing portion for pushing the constraint member. In a first state, the pushing portion engages with the constraint member such that the constraint member is in the first position; in a second state, the pushing portion disengages from the constraint member, and the constraint member is moved to the second position by the action of the elastic member.

[0021] In some embodiments, the first position is located above the second position, the constraint member includes a sleeve portion fitted onto the rotating shaft, and a lug extending radially outward from the outer peripheral wall of the sleeve portion, the lug having two sets disposed on opposite sides of the sleeve portion, the bracket having two spaced-apart support arms, the sleeve portion being inserted between the two support arms, the constraint device being in the first state, the two support arms being correspondingly supported below the two lugs.

[0022] In some embodiments, the drive assembly further includes a drive member having a drive end disposed below the bracket, the drive member being disposed on the linkage assembly, and the drive member being configured to move away from the bracket when the linkage assembly rotates and retracts relative to the first support.

[0023] Due to the application of the above technical solutions, the present invention has the following advantages: In the process of driving the connecting frame to flip and retract relative to the bottom support, the linkage can drive the connecting rod assembly to fold, so that the first support and the second support rotate and retract relative to each other, thereby folding the bottom support assembly and causing the trolley to change from an unfolded state to a folded state. The folding steps are few and the operation is convenient. Attached Figure Description

[0024] To more clearly illustrate the technical solution of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the trolley in its unfolded state according to Embodiment 1 of the present invention;

[0026] Figure 2 for Figure 1 A side view of the trolley's structure;

[0027] Figure 3 for Figure 1 A three-dimensional structural diagram of the folding process of the stroller;

[0028] Figure 4 for Figure 3 A side view of the trolley's structure;

[0029] Figure 5 for Figure 1 A three-dimensional structural diagram of the trolley in its folded state;

[0030] Figure 6 for Figure 5 A side view of the trolley's structure;

[0031] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure of the trolley after the seat has been removed;

[0032] Figure 8 This is a schematic diagram of the three-dimensional structure of the trolley in its unfolded state according to Embodiment 2 of the present invention. Figure 1 ;

[0033] Figure 9 This is a schematic diagram of the three-dimensional structure of the trolley in its unfolded state according to Embodiment 2 of the present invention. Figure 2 ;

[0034] Figure 10 This is a schematic diagram of the three-dimensional structure of the trolley in its unfolded state according to Embodiment 2 of the present invention. Figure 3 ;

[0035] Figure 11 This is a top view of the trolley in its unfolded state according to Embodiment 3 of the present invention;

[0036] Figure 12 For along Figure 11 Schematic diagram of the cross-sectional structure along the middle AA direction;

[0037] Figure 13 for Figure 12 Enlarged schematic diagram of section B in the middle;

[0038] Figure 14 for Figure 11 A schematic diagram of the wheel structure and wheel frame in a trolley;

[0039] Figure 15This is a structural schematic diagram of the constraint component;

[0040] Figure 16 This is a structural diagram of the bracket;

[0041] Figure 17 This is a schematic diagram of the drive component.

[0042] Figure 18 for Figure 11 Partial cross-section diagram of the trolley in its unfolded state Figure 1 ;

[0043] Figure 19 for Figure 18 Enlarged diagram of section C;

[0044] Figure 20 for Figure 11 Partial cross-section diagram of the trolley in its unfolded state Figure 2 ;

[0045] Figure 21 for Figure 20 Enlarged schematic diagram of section D in the middle;

[0046] Figure 22 for Figure 11 A top-view structural diagram of the folded trolley;

[0047] Figure 23 For along Figure 22 Schematic diagram of the cross-sectional structure in the middle EE direction;

[0048] Figure 24 for Figure 23 Enlarged schematic diagram of section F in the middle;

[0049] In the attached diagrams above:

[0050] 1. First bracket; 11. First support rod; 2. Second bracket; 21. Second support rod; 3. First connecting rod; 4. Second connecting rod; 5. Connecting frame; 51. Lower push rod; 52. Upper push rod; 6. Linkage component; 7. Swinging component; 8. Support component; 81. Connecting seat; 82. Crossbar; 83. Seat plate; 84. Plug-in seat;

[0051] 9. Restraint device; 91. Restraint component; 911. Sleeve portion; 912. Positioning groove; 913. Guide surface; 913a. First end; 913b. Second end; 914. Lug; 915. Boss; 92. Elastic component; 93. Bracket; 931. Support arm portion; 932. Alignment groove; 933. Limiting protrusion; 94. Drive component; 941. Drive end; 942. Limiting protrusion; 943. Adapter end; 944. Insertion hole; 95. Plug;

[0052] 10. First wheel assembly; 101. Wheel seat; 102. Wheel frame; 103. Rotating shaft; 104. Positioning protrusion; 105. Wheel axle; 106. Wheel body; 107. Shock-absorbing spring; 20. Second wheel assembly. Detailed Implementation

[0053] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] In this document, the terms “up,” “down,” “left,” “right,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship observed by the user when pushing the cart provided in the embodiment. They are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] Example 1

[0056] See Figures 1 to 7 The illustrated vehicle can be a trolley, a seat, or other carrying device; here it is specifically a trolley. The trolley has an unfolded state and a folded state. The trolley includes a foldable base frame assembly, a connecting frame 5 rotatably connected to the base frame assembly about a first axis X1, and a linkage 6 connecting the connecting frame 5 and the base frame assembly. The base frame assembly includes a first support 1 and a second support 2 rotatably connected at their upper parts, and a foldable linkage assembly connecting the first support 1 and the second support 2. The linkage 6 is rotatably connected to the connecting frame 5 about a second axis X2, which is offset from the first axis X1. During the process of the connecting frame 5 flipping and folding relative to the base frame assembly, the linkage 6 drives the linkage assembly to fold, causing the first support 1 and the second support 2 to rotate and fold together, thereby transforming the trolley from an unfolded state to a folded state. Thus, when the trolley needs to be folded, simply drive the connecting frame 5 to flip relative to the bottom support assembly, and the linkage 6 will drive the connecting rod assembly to fold, thereby completing the folding of the trolley. The folding steps are few and the operation is convenient.

[0057] Specifically, in the base support assembly, the linkage assembly includes a first linkage 3 and a second linkage 4. The first end 3a of the first linkage 3 is rotatably connected to the second end 4a of the second linkage 4. The third end 3b of the first linkage 3 is rotatably connected to the first support 1, and the fourth end 4b of the second linkage 4 is rotatably connected to the second support 2. The first end 3a and the third end 3b are two ends of the first linkage 3 spaced apart along its length, and the second end 4a and the fourth end 4b are two ends of the second linkage 4 spaced apart along its length. When the trolley is in a folded state, the first linkage 3 and the second linkage 4 are retracted between the first support 1 and the second support 2. The linkage 6 is movably connected to the first linkage 3 or the second linkage 4 so that when the connecting frame 5 flips relative to the base support assembly, it drives the first linkage 3 or the second linkage 4 to move, thereby causing the linkage assembly to fold and further realizing the folding of the trolley.

[0058] See Figure 1 , Figure 2 As shown, when the trolley is in the unfolded state, the first end 3a is higher than the third end 3b, the second end 4a is higher than the fourth end 4b, and the linkage 6 is rotatably connected to the first end 3a or the second end 4a, or the linkage 6 is rotatably connected to the first end 3a and the second end 4a around the same axis. During the process of the connecting frame 5 flipping and closing relative to the bottom support assembly, the linkage 6 drives the first end 3a and the second end 4a to move upward, thereby causing the first link 3 to rotate relative to the first support 1 and the second link 4 to rotate relative to the second support 2. The first link 3 and the second link 4 rotate relative to each other and close together.

[0059] Referring to the accompanying drawings, when the trolley is in its unfolded state, the connecting frame 5 extends obliquely in the vertical direction. The lower part of the connecting frame 5 is rotatably connected to the first support 1 or the second support 2, with the first axis X1 located above the second axis X2. When the trolley is folded, the connecting frame 5 flips backward and retracts with the bottom support assembly. The lower part of the connecting frame 5 moves upward, causing the second axis X2 to shift to above the first axis X1. During the folding process, the first end 3a and the second end 4a remain below the first axis X1. When the trolley is folded, the first link 3 and the second link 4 of the linkage assembly are located below the top of the first support 1 and the second support 2, preventing an increase in size and irregular shape after folding.

[0060] In this embodiment, the upper part of the first bracket 1, the upper part of the second bracket 2, and the lower part of the connecting frame 5 are rotatably connected around the first axis X1. In the trolley of this embodiment, the first bracket 1 is specifically a front bracket, and a first wheel assembly 10 is provided at its bottom; the second bracket 2 is specifically a rear bracket, and a second wheel assembly 20 is provided at its bottom; the connecting frame 5 is specifically a push rod frame; the first connecting rod 3, the second connecting rod 4, and the linkage 6 are connected and supported between the first bracket 1, the second bracket 2, and the connecting frame 5.

[0061] See Figure 1 , Figure 2 As shown, in the unfolded state, the first support 1 and the first connecting rod 3 extend upward from front to back, while the second support 2 and the second connecting rod 4 extend upward from back to front. The connecting frame 5 extends upward from front to back. The upper parts of the first support 1, the upper parts of the second support 2, and the lower parts of the connecting frame 5 are rotatably connected around the first axis X1. The linkage 6 extends vertically and connects the lower part of the connecting frame 5 to the first connecting rod 3 and the second connecting rod 4. The connection between the upper parts of the first support 1, the upper parts of the second support 2, and the lower part of the connecting frame 5, as well as the rotatable connection between the connecting frame 5 and the linkage 6, can be achieved using a rotating joint. This makes the trolley very simple, as only the first support 1, the second support 2, the first connecting rod 3, the second connecting rod 4, the connecting frame 5, and the linkage 6 are visible from the side.

[0062] Specifically, in this embodiment, each component is arranged as follows: the first support 1 includes two first support rods 11, which are respectively disposed on the left and right sides and extend in the vertical direction; the second support 2 includes two second support rods 21, which are respectively disposed on the left and right sides and extend in the vertical direction; the first connecting rod 3 and the second connecting rod 4 each have two rods respectively disposed on the left and right sides; the connecting frame 5 is foldable along the length direction, specifically, it includes a lower push rod 51 and an upper push rod 52 that are rotatably connected, the lower push rod 51 and the upper push rod 52 each have two sets respectively disposed on the left and right sides, and the upper parts of the upper push rods 52 on both sides are connected by a crossbar to form an integral structure; the linkage 6 is rod-shaped and has two sets respectively disposed on the left and right sides.

[0063] On each side of the trolley, the upper parts of the first support rod 11, the upper parts of the second support rod 21, and the lower parts of the lower push rod 51 are rotatably connected around a first axis X1 via a rotating joint. The upper part of the linkage 6 is rotatably connected to the lower part of the lower push rod 51 around a second axis X2. The first axis X1 can be set to be collinear with the axis of the cylindrical rotating joint, while the second axis X2 is offset from its axis on the aforementioned rotating joint. The lower part of the linkage 6, the first end 3a of the first connecting rod 3, and the second end 4a of the second connecting rod 4 on the same side are rotatably connected around a third axis X3. The third end 3b of the first connecting rod 3 is rotatably connected to the lower part of the first support rod 11, and the fourth end 4b of the second connecting rod 4 is rotatably connected to the lower part of the second support rod 21. A crossbar extending in the left-right direction is provided between at least one of the two first support rods 11, two second support rods 21, two first connecting rods 3, two second connecting rods 4, and two linkages 6.

[0064] Referring to the accompanying drawings, in this trolley, the base support assembly further includes a support member 8 and a swing member 7. The support member 8 is rotatably connected to the first support 1 or rotatably connected to the second support 2. The swing member 7 is movably connected between the support member 8 and the linkage assembly. When the linkage assembly is folded, the swing member 7 drives the support member 8 to fold relative to the first support 1. Specifically, one end of the swing member 7 is rotatably connected to the support member 8, and the other end of the swing member 7 is rotatably connected to the first link 3 or the second link 4. In this embodiment, the support member 8 is rotatably connected to the first support 1 and the second support 2 about the same axis, and the swing member 7 is rotatably connected to the first end 3a of the first link 3 and the second end 4a of the second link 4 about the same axis.

[0065] In this embodiment, the support member 8 includes two connecting seats 81 disposed on the left and right sides, a crossbar 82 connected between the two connecting seats 81, and a seat plate 83 installed on the crossbar 82 and / or the two connecting seats 81; the swing member 7 is rod-shaped and has two sets disposed on the left and right sides. The two sets of swing members 7 and the support member 8 are located in the left and right direction between the first support rod 11, the second support rod 21 and the lower push rod 51 on both sides.

[0066] On the left and right sides of the trolley, the connecting seat 81 of the support member 8, the upper part of the first support rod 11, the upper part of the second support rod 21, and the lower part of the lower push rod 51 are rotatably connected around the first axis X1. The swing member 7, the linkage member 6, the first end 3a and the second end 4a are rotatably connected around the third axis X3. The first axis X1 is always located above the third axis X3. In the left and right direction, the swing member 7 is located inside the linkage member 6. When the trolley is in the unfolded state, the swing member 7 is blocked by the linkage member 6 in the left and right direction. The swing member 7 cannot be seen from the side of the trolley, which makes the overall appearance of the trolley look very simple.

[0067] In summary, when it is necessary to fold the trolley of this embodiment, such as Figure 3 , Figure 4 As shown, after the upper push rod 52 and the lower push rod 51 are rotated and folded relative to each other, the connecting frame 5 is driven to flip backward, which drives the linkage 6 to move upward, causing the first end 3a of the first link 3 and the second end 4a of the second link 4 to move upward. The first link 3 rotates relative to the first bracket 1, and the second link 4 rotates relative to the second bracket 2, causing the first bracket 1 and the second bracket 2 to gradually move closer together in the front-back direction. At the same time, the swinging member 7 is driven, thereby driving the support member 8 to rotate and fold relative to the first bracket 1. The trolley is finally folded as follows. Figures 5 to 7 As shown, its structure is flat, and its overall height is basically the same as that of the second wheel component 20 and the second bracket 2, which brings convenience to the user's daily use and storage.

[0068] Example 2

[0069] See Figures 8 to 10 As shown, the vehicle in this embodiment is also a trolley, and its main difference from the trolley in Embodiment 1 lies in the structure of the support member 8. In this embodiment, the support member 8 includes two sets of plug-in seats 84 disposed on the left and right sides. The plug-in seats 84 are rotatably connected to the first support 1, the second support 2, the connecting frame 5, and the linkage member 6 around the first axis X1. The support member 8 is also rotatably connected to the swing member 7 through the plug-in seats 84. The support member 8 also includes a seat device (not shown in the figure), which is connected to the plug-in seats 84 on both sides. When the trolley is folded, the seat device can be folded up with the first support 1.

[0070] Example 3

[0071] See Figures 11 to 24 As shown, the carrier provided in this embodiment is specifically a trolley. The structure of the trolley is basically the same as that of the trolley in Embodiment 1. The main difference is that the trolley in this embodiment also has a constraint device 9, which is used to constrain the first wheel assembly 10 so that its wheels can be oriented, thereby making the structure of the trolley more flat and compact in the folded state.

[0072] Specifically, the first wheel assembly 10 is a swivel wheel assembly, which includes a wheel seat 101, a wheel frame 102 with a rotating shaft 103, and a wheel body 106 rotatably mounted on the wheel frame 102 around a wheel axle 105. The wheel seat 101 is fixed to the bottom of the first support 1, specifically to the bottom of the first support rod 11, or the wheel seat 101 can also be regarded as part of the first support rod 11. The rotating shaft 103 is rotatably connected to the wheel seat 101 around its own axis, and a shock-absorbing spring 107 is also provided between the wheel seat 101 and the wheel frame 102.

[0073] The trolley is also equipped with a restraint device 9, which has a restraint member 91 that is movably connected to the rotation shaft 103. The restraint device 9 can switch between a first state and a second state. In the first state, the restraint member 91 is disengaged from the rotation shaft 103, allowing the wheel frame 102 to rotate relative to the wheel seat 101 around the rotation shaft 103, and the first wheel assembly 10 has the function of a swivel wheel. In the second state, the restraint member 91 cooperates with the rotation shaft 103 to restrict the rotation of the rotation shaft 103, fixing the wheel frame 102 relative to the wheel seat 101. This allows the axle 105 and the wheel body 106 to be fixed to extend in the desired direction, avoiding interference with the folding of the various rods in the trolley and affecting the compactness of the folded structure of the trolley.

[0074] See Figures 11 to 24 As shown, the constraint member 91 is provided with a constraint part, and the rotating shaft 103 is provided with a mating part. In the first state, the constraint part and the mating part are disengaged. In the second state, the constraint part and the mating part are mated, causing the axle 105 to extend along a preset direction and the wheel 106 to extend accordingly along another preset direction. Specifically, the constraint member 91 is also provided with a guide part, which is circumferentially connected to the constraint part. During the transition of the constraint device 9 from the first state to the second state, the mating part can move along the guide part until it is mated with the constraint part when the rotating shaft 103 rotates.

[0075] In this embodiment, the constraint member 91 is slidably sleeved on the rotation shaft 103 along the axial direction of the rotation shaft 103. The mating part is a positioning protrusion 104 that can extend radially along the rotation shaft 103. The constraint part is a positioning groove 912 into which the positioning protrusion 104 can be inserted. The guide part is a guide surface 913 that extends helically around the axis of rotation shaft 103. Specifically, see Figure 15 As shown, the constraint member 91 has a sleeve portion 911 fitted onto the rotating shaft 103, and the aforementioned guide surface 913 is formed on one side of its shaft end face. The guide surface 913 has two sets connected in the circumferential direction. Each set of guide surfaces 913 has a first end 913a and a second end 913b respectively located at opposite ends in the length direction. The two sets of first ends 913a are connected to the positioning groove 912, and the two sets of guide surfaces 913 are connected to the second ends 913b. The guide surface 913 extends from the first end 913a to the second end 913b along the axial direction of the rotating shaft 103 away from the positioning groove 912.

[0076] In a first state, the constraint device 91 is in a first position; in a second state, the constraint device 91 is in a second position. The constraint device 9 also includes an elastic element 92 that provides the force required for the constraint element 91 to move from the first position to the second position, and a drive assembly for driving the constraint element 91 from the second position to the first position. The drive assembly includes a bracket 93 rotatably mounted on a wheel seat 101. The bracket 93 has a pushing portion for pushing the constraint element 91. In the first state, the pushing portion cooperates with the constraint element 91 so that the constraint element 91 overcomes the force of the elastic element 92 and remains in the first position. When the constraint device is in the second state, the pushing portion disengages from the constraint element 91, and the constraint element 91 is moved to the second position under the action of the elastic element 92.

[0077] In this embodiment, the first position is located above the second position. When the constraint member 91 moves downward along the axial direction of the rotation shaft 103, the constraint device 9 changes from the first state to the second state. Correspondingly, the positioning groove 912 and the guide surface 913 are both provided at the lower end of the sleeve portion 911. See also Figure 15 , Figure 16 As shown, in this embodiment, the constraint member 91 has a lug 914 extending radially outward from the outer peripheral wall of the sleeve portion 911. The lug 914 has two sets located on opposite sides of the sleeve portion 911. The bracket 93 has two spaced-apart support arms 931, with the sleeve portion 911 inserted between the two support arms 931. These two support arms 931 act as pushing portions of the bracket 93. When the constraint device 9 is in the first state, the two support arms 931 are correspondingly supported below the two lugs 914, keeping the constraint member 91 in a relatively high first position. By driving the bracket 93 to rotate relative to the wheel seat 101, the upward lifting effect of the bracket 93 on the lugs 914 can be released, allowing the constraint member 91 to shift to the second position under the action of the elastic member 92. Each support arm 931 is also provided with an upwardly protruding limiting protrusion 933 at its end, which can limit the lug 914 between the bracket 93 rotating on the wheel seat 101 and the limiting protrusion 933.

[0078] In this embodiment, the drive assembly further includes a drive member 94, which is configured to drive the bracket 93 to rotate relative to the wheel seat 101 when the first bracket 1 moves relative to the first connecting rod 3, thereby automatically switching the restraint device 9 from the first state to the second state during the folding process of the trolley. Specifically, see Figure 13 , Figure 17 and Figure 24As shown, the driving member 94 is fixedly disposed at one end of the first connecting rod 3 and can move synchronously with the first connecting rod 3. Here, the driving member 94 has a driving end 941 and a connecting end 943. The driving end 941 is disposed below the bracket 93 and is used to drive the bracket 93 to rotate relative to the wheel seat 101. The connecting end 943 is provided with a insertion hole 944, and the lower end of the first connecting rod 3 can be inserted into the insertion hole 944. Then, the connecting end 943 and the first connecting rod 3 are connected to the wheel seat 101 together by a pin, so as to realize the rotational connection between the first connecting rod 3 and the first bracket 1. At the same time, when the first connecting rod 3 rotates, the driving member 94 can rotate synchronously relative to the wheel seat 101. Here, the drive end 941 is also provided with an upwardly facing limiting protrusion 942, and the bottom of the two support arms 931 is provided with an alignment groove 932. When the drive member 94 and the bracket 93 cooperate with each other, the limiting protrusion 942 is correspondingly embedded in the alignment groove 932, so that the two are in cooperation and not easy to slip off, thereby enabling the constraint member 91 to be stably maintained in the first position.

[0079] In summary, the trolley provided in this embodiment, in its unfolded state, has the first support 1 and the first connecting rod 3 unfolded relative to each other, as shown below. Figure 12 , Figure 13 As shown, at this time, the driving end 941 of the driving member 94 pushes the support arm 931 of the bracket 93 upward, and the limiting protrusion 942 is correspondingly embedded in the alignment groove 932; the two support arms 931 of the bracket 93 push upward below the two lugs 914, so that the constraint member 91 overcomes the elastic force and remains in the first position. At this time, the wheel frame 102 can carry the wheel body 106 to rotate freely around the rotation axis 103 relative to the wheel seat 101.

[0080] When the trolley is folded, the first link 3 rotates and retracts relative to the first support rod 11, causing the drive end 941 of the drive member 94 to gradually move away from the bracket 93. Under the force of the elastic member 92 pushing the constraint member 91 downward, the constraint member 91 moves downward and pushes the bracket 93 to rotate relative to the wheel seat 101. During the downward movement of the constraint member 91, the guide surface 913 abuts against the positioning protrusion 104, causing the positioning protrusion 104 to slide along the guide surface 913 until the positioning protrusion 104 is engaged in the positioning groove 912. The constraint member 91 reaches the second position. At this time, the wheel body 106 is oriented. Specifically, the wheel body 106 extends in the front-back direction, and the wheel axle 105 extends in the left-right direction. The two sets of first wheel assemblies 10 can be retracted between the two sets of second wheel assemblies 20.

[0081] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0083] It should also be noted that "rotational connection" in the above embodiments refers to pivot connection, unless the context clearly indicates other rotational connection methods.

[0084] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0085] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0086] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0087] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A carrier having an unfolded state and a folded state, characterized by: The carrier comprises a foldable bottom support assembly, a connecting frame rotatably connected to the bottom support assembly about a first axis, and a linkage connected between the connecting frame and the bottom support assembly, the bottom support assembly comprises a first support and a second support rotatably connected, and a link assembly connected between the first support and the second support and foldable, the linkage is rotatably connected to the connecting frame about a second axis, the first axis and the second axis are offset from each other, wherein, during the process of the connecting frame being folded relative to the bottom support assembly, the linkage drives the link assembly to fold so that the first support and the second support are folded relative to each other.

2. The vehicle of claim 1, wherein: The link assembly comprises a first link and a second link, a first end of the first link and a second end of the second link are rotatably connected, a third end of the first link is rotatably connected to the first support, a fourth end of the second link is rotatably connected to the second support, the first end and the third end are two ends of the first link arranged in the length direction of the first link, the second end and the fourth end are two ends of the second link arranged in the length direction of the second link, when the carrier is in a folded state, the first link and the second link are folded relative to each other between the first support and the second support, wherein the linkage is movably connected to the first link or the second link.

3. The carrier of claim 2, wherein: When the carrier is in an unfolded state, the first end is higher than the third end, the second end is higher than the fourth end, the linkage is rotatably connected to the first end or the second end, or the linkage is rotatably connected to the first end and the second end about the same axis, wherein, during the process of the connecting frame being folded relative to the bottom support assembly, the linkage drives the first end and the second end to move upward.

4. The carrier of claim 3, wherein: When the carrier is in an unfolded state, a lower part of the connecting frame is rotatably connected to the first support or the second support, and the first axis is located above the second axis; when the carrier is in a folded state, the second axis is located above the first axis.

5. The carrier of claim 4, wherein: The first end and the second end are always located below the first axis.

6. The carrier of claim 2, wherein: An upper part of the first support, an upper part of the second support, and the connecting frame are rotatably connected about the first axis.

7. The carrier of claim 2, wherein: The bottom support assembly further comprises a support and a swing, the support is rotatably connected to the first support or the second support, and the swing is movably connected between the support and the link assembly, wherein, when the link assembly is folded, the swing drives the support to fold relative to the first support.

8. The carrier of claim 7, wherein: One end of the swing is rotatably connected to the support, and the other end of the swing is rotatably connected to the first link or the second link.

9. The carrier of claim 8, wherein: The supporting member is rotatably connected with the first support and the second support around the same axis line, and the swing member is rotatably connected with the first end and the second end around the same axis line.

10. The vehicle of claim 9, wherein: The supporting member, the first support, the second support and the connecting frame are collectively rotatably connected around the first axis line, and the swing member, the linkage member, the first end and the second end are collectively rotatably connected around a third axis line, the first axis line is above the third axis line, and the swing member is inside the linkage member in the left-right direction when the carrier is in the unfolded state.

11. The carrier of any one of claims 1 to 10, wherein: The carrier is a stroller, and the carrier further comprises a first wheel assembly arranged at the bottom of the first support and a second wheel assembly arranged at the bottom of the second support, wherein the first wheel assembly comprises a wheel seat, a wheel frame with a rotating shaft, and a wheel body rotatably mounted on the wheel frame around the rotating shaft, the wheel seat is connected to the first support, the rotating shaft is rotatably connected to the wheel seat around its axis line, and a restraint device is further arranged on the stroller, the restraint device has a restraint member, and the restraint member is movably connected to the rotating shaft, wherein the restraint device is in a first state, the restraint member is disengaged from the rotating shaft, so that the wheel frame can rotate relative to the wheel seat around the rotating shaft; and the restraint device is in a second state, the restraint member cooperates with the rotating shaft to limit the rotation of the rotating shaft, so that the wheel frame is fixed relative to the wheel seat.

12. The vehicle of claim 11, wherein: The restraint member is provided with a restraint portion, the rotating shaft is provided with a matching portion, the restraint device is in the first state, the restraint portion is disengaged from the matching portion, the restraint device is in the second state, the restraint portion cooperates with the matching portion, the wheel shaft extends in a predetermined direction, wherein the restraint member is further provided with a guide portion, the guide portion is circumferentially connected to the restraint portion, and the matching portion moves along the guide portion when the rotating shaft rotates during the conversion of the restraint device from the first state to the second state until the restraint portion cooperates with each other.

13. The vehicle of claim 12, wherein: The restraint member can be slidably sleeved on the rotating shaft along the axial direction of the rotating shaft, the matching portion is a positioning protrusion protruding in the radial direction of the rotating shaft, the restraint portion is a positioning groove into which the positioning protrusion can be fitted, and the guide portion is a guide surface spirally extending around the axis line of the rotating shaft. The guide surface has two groups of circumferentially connected guide surfaces, each group of guide surfaces has a first end and a second end arranged at different ends in the length direction, the first ends of the two groups of guide surfaces are connected to the positioning groove, the second ends of the two groups of guide surfaces are connected, and the guide surface extends away from the positioning groove in the axial direction of the rotating shaft from the first end to the second end.

14. The vehicle of claim 11, wherein: The constraint member is arranged to move along the axial direction of the rotating shaft, the constraint device is in the first state, and the constraint member is in a first position; the constraint member is in the second state, and the constraint member is in a second position, the constraint device further comprises an elastic member for providing the force required for the movement of the constraint member from the first position to the second position, and a driving assembly for driving the movement of the constraint member from the second position to the first position, The driving assembly comprises a bracket, the bracket is rotatably arranged on the wheel seat, the bracket has a pushing part for pushing the constraint member, the constraint device is in the first state, and the pushing part cooperates with the constraint member so that the constraint member is in the first position; the constraint device is in the second state, the pushing part is separated from the cooperation with the constraint member, and the constraint member is converted to the second position under the action of the elastic member.

15. The vehicle of claim 14, wherein: The first position is located above the second position, the constraint member comprises a sleeve part cooperatively arranged on the rotating shaft, and a lug part protruding and extending radially outward from the outer circumferential wall of the sleeve part, the lug part has two groups respectively arranged on different sides of the sleeve part, the bracket has two spaced apart bracket arm parts, the sleeve part is inserted between the two bracket arm parts, the constraint device is in the first state, and the two bracket arm parts are correspondingly supported below the two lug parts.

16. The vehicle of claim 14, wherein: The driving assembly further comprises a driving member, the driving member has a driving end part arranged below the bracket, the driving member is arranged on the connecting rod assembly, and the driving member is configured to move away from the bracket when the connecting rod assembly is relatively rotated and folded to the first support.

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