Carrier

Abstract

The utility model discloses a carrier which comprises a bearing body, a front wheel assembly and a rear wheel assembly, the front wheel assembly and the rear wheel assembly are arranged at the bottom of the bearing body, the front wheel assembly is detachably or movably connected to the bearing body, and the installation position of the rear wheel assembly on the bearing body can be adjusted in the front-back direction. The carrier has a first use state and a second use state, in the first use state, the front wheel assembly and the rear wheel assembly are distributed at intervals in the front-back direction and jointly supported on the ground, and the rear wheel assembly is installed at a first position on the bearing body; in the second use state, the carrier is supported on the ground through the rear wheel assembly, the rear wheel assembly is installed at a second position on the bearing body, the second position is located on the front side of the first position, the functions of the carrier are enriched, and waste of resources is avoided.

Description

Technical Field

[0001] The utility model relates to a carrier. Background Art

[0002] In our daily lives, vehicles such as carts and trailers provide convenience for people, but most of them have single functions and can only be used in specific scenarios, which limits the frequency of use of the vehicles. As a result, the vehicles are idle most of the time and cannot be effectively utilized, resulting in a waste of resources. At the same time, idle vehicles also take up space, causing great inconvenience to users. Utility Model Content

[0003] The purpose of the utility model is to provide a new carrier.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a vehicle, comprising a carrying body, a front wheel assembly and a rear wheel assembly arranged at the bottom of the carrying body, wherein the front wheel assembly is detachably or movably connected to the carrying body, and the mounting position of the rear wheel assembly on the carrying body can be adjusted along the front-rear direction.

[0005] The vehicle has a first usage state and a second usage state. In the first usage state, the front wheel assembly and the rear wheel assembly are spaced apart in the front-to-rear direction and are jointly supported on the ground, and the rear wheel assembly is installed at a first position on the carrying body. In the second usage state, the vehicle is supported on the ground by the rear wheel assembly, and the rear wheel assembly is installed at a second position on the carrying body, wherein the second position is located in front of the first position.

[0006] In some embodiments, the vehicle further includes a towing rod, which is detachably or movably connected to the carrying body. When the vehicle is in the first usage state, the towing rod is detached from the carrying body or retracted relative to the carrying body; when the vehicle is in the second usage state, the towing rod extends forward from the front of the carrying body.

[0007] In some embodiments, the carrier further includes an adapter having an adapter portion and a mounting portion arranged at intervals, the adapter portion being rotatably connected to the carrier body around a rotation center line, the rear wheel assembly being connected to the mounting portion, and when the adapter swings around the rotation center line, the mounting portion changes position in the front and rear directions, causing the rear wheel assembly to switch between the first position and the second position.

[0008] In some embodiments, the rear wheel assembly has an axle, the axis of the axle is parallel to the rotation center line, and the axle is rotatably connected to the mounting portion around its own axis. When the angle between the adapter and the horizontal plane changes, the distance between the rotation center line and the axis of the axle in the front-to-back direction changes, wherein when the rear wheel assembly is in the first position and the second position, the axis of the axle is at the same height.

[0009] In some embodiments, when the rear wheel assembly is in the first position, the adapter extends gradually and obliquely backward from the adapter portion to the mounting portion; when the rear wheel assembly is in the second position, the adapter extends obliquely forward from the adapter portion to between the mounting portions, and / or,

[0010] The adapter has two adapter rods arranged at intervals in the left-right direction, one end of each of the two adapter rods is connected to the supporting body through a locking member, and the wheel axle is connected to the other end of the two adapter rods so as to be rotatable around its own axis, wherein the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation centerline.

[0011] In some embodiments, the vehicle further includes a mounting seat, which is fixedly disposed on the carrying body, and the rear wheel assembly is slidably connected to the mounting seat along the front-rear direction.

[0012] In some embodiments, the mounting base includes two sliding rods spaced apart in the left-right direction, the sliding rods extending in the front-to-back direction, and the rear wheel assembly includes an axle, which can be slidably connected to the sliding rods along the length extension direction of the sliding rods, wherein the sliding rods on each side are provided with sliding grooves extending in the front-to-back direction, and the axles are slidably inserted in the sliding grooves on both sides.

[0013] In some embodiments, the sliding rod on each side is fixed with a front link and a rear link, and the front link and the rear link extend in the up and down directions and are fixed to the supporting body, wherein the distance between the first connection position where the front link is fixed on the supporting body and the second connection position where the rear link is fixed on the supporting body is less than the length of the sliding rod.

[0014] In some embodiments, a plurality of engaging structures are provided on the carrying body, and the plurality of engaging structures are distributed at intervals along the front-to-rear direction, and the rear wheel assembly is detachably connected to the engaging structures.

[0015] In some embodiments, the rear wheel assembly includes an axle and two wheel bodies disposed at both ends of the axle, the supporting body is located between the two wheel bodies in the left-right direction, and the axle is entirely located below the supporting body;

[0016] The load-bearing body includes a base frame and a side frame arranged on the base frame. The side frame and the base frame cooperate with each other to form a accommodating space. The front wheel assembly and the rear wheel assembly are both installed on the base frame. The base frame has a horizontal load-bearing surface, and the wheel body is at least partially higher than the load-bearing surface.

[0017] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art: the position of the rear wheel assembly of the vehicle of the present invention on the carrying body can be adjusted, thereby changing the state of the vehicle, and the wheelbase between the front wheel assembly and the rear wheel assembly can also be changed, thereby changing the working mode of the vehicle. Users can adjust the rear wheel assembly according to their needs, so that the vehicle can be suitable for different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 This is a schematic diagram of the three-dimensional structure of the carrier of Example 1 of the present utility model in the first use state;

[0019] Attachment Figure 2 For attachment Figure 1 A side view schematic diagram of

[0020] Attachment Figure 3 For attachment Figure 2 Schematic diagram of the front wheel assembly after position adjustment;

[0021] Attachment Figure 4 is a schematic diagram of the three-dimensional structure of the carrier of Example 1 in a second usage state;

[0022] Attachment Figure 5 For attachment Figure 4 A side view schematic diagram of

[0023] Attachment Figure 6 For attachment Figure 5 Schematic diagram when the front wheel assembly is not removed;

[0024] Attachment Figure 7 is a schematic diagram of the carrier of Example 2 in a first usage state;

[0025] Attachment Figure 8 is a schematic diagram of the carrier of Example 2 in a second usage state;

[0026] Attachment Figure 9 is a schematic diagram of the carrier of Example 3 in a first usage state;

[0027] Attachment Figure 10 is a schematic diagram of the carrier of Example 3 in a second usage state;

[0028] Among them: 100, load-bearing body; 110, chassis; 120, side frame; 121, front fence; 122, rear upper fence; 123, rear lower fence; 124, bottom support rod; 130, cross link; 140, push handle frame; 141, handle bar; 142, connecting rod; 200, front wheel assembly; 300, rear wheel assembly; 310, wheel axle; 320, wheel body; 400, traction rod; 500, adapter; 510, adapter rod; 511, adapter part; 512, mounting part; 600, locking part; 700, mounting seat; 710, slide bar; 720, slide groove; 730, front connecting rod; 740, rear connecting rod; 800, joint structure; 810, connecting hole; 820, fixing seat. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments to make the advantages and features of the present invention easier for those skilled in the art to understand. Obviously, the embodiments described in this application are only part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0030] Example 1

[0031] See also Figure 1 、 Figure 4 The vehicle shown includes a carrying body 100, a front wheel assembly 200 and a rear wheel assembly 300 arranged at the bottom of the carrying body 100, the front wheel assembly 200 can be detachably or movably connected to the carrying body 100, and the installation position of the rear wheel assembly 300 on the carrying body 100 can be adjusted along the front and rear directions.

[0032] The vehicle has a first usage state and a second usage state. In the first usage state, the front wheel assembly 200 and the rear wheel assembly 300 are spaced apart in the front-to-back direction and are jointly supported on the ground. The rear wheel assembly 300 is installed in a first position on the load-bearing body 100. In the second usage state, the vehicle is supported on the ground by the rear wheel assembly 300. The rear wheel assembly 300 is installed in a second position on the load-bearing body 100, wherein the second position is located forward of the first position. In the first usage state, the wheelbase between the front wheel assembly 200 and the rear wheel assembly 300 is larger, and the vehicle is more stable, suitable for carrying large or heavy items. In the second usage state, the rear wheel assembly 300 moves forward, making the vehicle more flexible.

[0033] In this embodiment, see Figure 4As shown, the vehicle further includes a towing rod 400, which is detachably or movably connected to the carrier body 100. The towing rod 400 can be used to fix the vehicle behind a bicycle or other movable vehicle and be driven forward by the bicycle or other movable vehicle.

[0034] In the first usage state, the rear wheel assembly 300 is positioned rearward. When the vehicle in this state is secured to the rear of a bicycle or other movable vehicle via the tow bar 400, the wheelbase between the rear wheel assembly 300 and the bicycle or other movable vehicle is large, causing the vehicle to tip over due to instability when turning. In this embodiment, when the vehicle is in the first usage state, the tow bar 400 can be detached from the carrier body 100 or retracted relative to the carrier body 100, allowing the vehicle to be used independently as a cart. In the second usage state, the tow bar 400 can be extended forward from the front of the carrier body 100 and secured to the rear of a bicycle or other vehicle. In this state, the vehicle can be used as a trailer. In the second usage state, the rear wheel assembly 300 is in the second position, reducing the distance between the vehicle's rear wheel assembly 300 and the wheel of the vehicle ahead, thereby improving its turning flexibility. In order to further improve the flexibility of the carrier in the second usage state, the front wheel assembly 200 can be removed or folded relative to the carrying body 100 .

[0035] In this embodiment, the carrier body 100 is provided with a plurality of engagement structures 800, spaced apart along the front-to-back direction. The rear wheel assembly 300 is detachably connected to the engagement structures 800. By connecting the rear wheel assembly 300 to different engagement structures 800, the position of the rear wheel assembly 300 can be switched. Specifically, in this embodiment, two engagement structures 800 are provided along the front-to-back direction. When the rear wheel assembly 300 is connected to the front engagement structure 800, the rear wheel assembly 300 is in the second position; when the rear wheel assembly 300 is connected to the rear engagement structure 800, the rear wheel assembly 300 is in the first position. In other embodiments, the carrier body 100 is provided with more than two engagement structures 800, thereby allowing the rear wheel assembly 300 to have multiple adjustable positions.

[0036] In this embodiment, the rear wheel assembly 300 includes an axle 310, and a connecting hole 810 extending in the left-right direction is provided on the coupling structure 800. The connection between the rear wheel assembly 300 and the coupling structure 800 is achieved by inserting the axle 310 into the connecting hole 810; the rear wheel assembly 300 and the coupling structure 800 can be detached by driving the axle 310 out of the connecting hole 810.

[0037] In this embodiment, the carrier body 100 includes a base frame 110, on which the front wheel assembly 200 and the rear wheel assembly 300 are mounted, and the coupling structure 800 is fixed to the base frame 110. Specifically, the base frame 110 extends in the front-to-back direction, the front wheel assembly 200 is fixed to the bottom front portion of the base frame 110, and two coupling structures 800 are fixed to the lower portion of the base frame 110 at intervals.

[0038] In some embodiments, the rear wheel assembly 300 includes an axle 310 extending in the left-right direction. The axle 310 is entirely located below the supporting body 100 . The rear wheel assembly 300 also includes two wheel bodies 320 disposed at both ends of the axle 310 .

[0039] In this embodiment, see Figure 1 As shown, the rear wheel assembly 300 comprises two groups, one on the left and one on the right. Each group of rear wheel assemblies 300 comprises an axle 310 and a wheel body 320 mounted on the axle 310. The axis lines of the two axles 310 extend collinearly, and the supporting body 100 is positioned between the two wheel bodies 320 in the left-right direction. In this embodiment, each coupling structure 800 comprises two fixing seats 820, one on the left and one on the right of the base frame 110. Each fixing seat 820 is provided with a connecting hole 810 for plugging into the axle 310. The two connecting holes 810 in each coupling structure 800 extend in the same direction. In this embodiment, the front wheel assembly 200 also comprises two groups, one on the left and one on the right, and is a universal wheel.

[0040] In this embodiment, a shock-absorbing mechanism is provided on the rear engagement structure 800. Specifically, when the vehicle is in the first usage state, the rear wheel assembly 300 is mounted on the rear fixing seat 820 so as to be movable up and down relative to the load-bearing body 100. A shock-absorbing spring is provided between the chassis 110 and the rear wheel assembly 300 to provide a force that prevents the chassis 110 and the rear wheel assembly 300 from moving closer together, thereby achieving a cushioning and shock-absorbing effect. In some preferred embodiments, each engagement structure 800 is provided with a shock-absorbing mechanism.

[0041] In this embodiment, the chassis 110 has a horizontal bearing surface, and the wheel body 320 is at least partially higher than the bearing surface. The wheel body 320 is larger in size. When the vehicle is used as a trailer, the rear wheel assembly 300 has better grip and can better maintain the stability of the vehicle when moving at a faster speed. At the same time, the larger wheel body 320 has a longer service life and is more durable.

[0042] In this embodiment, the carrier body 100 further includes side frames 120 disposed on the base frame 110. The side frames 120 and the base frame 110 cooperate to form a storage space, in which items can be placed or people can sit. Specifically, the side frames 120 include two groups, one on the left and one on the right sides of the base frame 110. Each group of side frames 120 includes a front fence 121, a rear fence, and a bottom support rod 124. The front fence 121, the rear fence, and the bottom support rod 124 are connected end to end to form a closed frame. As shown in the figure, the bottom support rod 124 extends in a front-to-back direction. The front fence 121 extends upward and backward from the front portion of the bottom support rod 124, and the front fence 121 is in an upwardly arched arc shape. The rear fence rod extends in a vertical direction and is connected between the upper portion of the front fence 121 and the rear portion of the bottom support rod 124. In this embodiment, the front portion of the bottom support rod 124 is bent upward to increase the height of the front side of the accommodating space, thereby increasing the volume of the accommodating space.

[0043] In this embodiment, the rear fence includes an interconnected upper fence 122 and a lower fence 123. The upper portion of the upper fence 122 is rotationally connected to the rear portion of the front fence 121, the lower portion of the upper fence 122 is rotationally connected to the upper portion of the lower fence 123, and the lower portion of the lower fence 123 is rotationally connected to the rear portion of the bottom support rod 124. The front fence 121, the upper fence 122, the lower fence 123, and the bottom support rod 124 form a four-bar linkage. By folding the upper fence 122 and the lower fence 123 relative to each other, the front fence 121 is driven to fold downward relative to the bottom support rod 124, thereby folding the side frames 120 together in the vertical direction. When the vehicle is not in use, folding the side frames 120 can reduce the size of the vehicle, making it easier to store.

[0044] In this embodiment, the carrier body 100 further includes a horizontal connecting rod 130 extending in the left-right direction and connected between the two sets of side frames 120, which is used to maintain the stability between the two sets of side frames 120 and make the two side frames 120 become a whole. Specifically, there are multiple horizontal connecting rods 130, see Figure 1 As shown, one of the cross-links 130 connects the two bottom support bars 124 on both sides of the seat, and a locking mechanism is provided between the chassis 110 and the cross-link 130 to achieve a fixed connection between the side frame 120 and the chassis 110. When the locking mechanism is unlocked, the side frame 120 can be removed from the chassis 110. A cross-link 130 is also connected between the upper portions of the two front fence bars 121 or between the upper portions of the two rear upper fence bars 122. In this embodiment, the vehicle also has a push handle frame 140, see Figure 1As shown, the handle frame 140 is rotatably connected to the horizontal connecting rod 130 about the axis of the horizontal connecting rod 130. The handle frame 140 is rotatably arranged so that the user can adjust the handle frame 140 to a comfortable position by rotating it. Therefore, when the vehicle is not in use, or in the second usage position when the vehicle is used as a trailer, the handle frame 140 can be rotated to fold relative to the side frame 120, thereby reducing the size of the vehicle.

[0045] Specifically, the push handle frame 140 is U-shaped and includes a handle bar 141 extending in the left-right direction and two connecting bars 142 extending in the front-back direction. The two connecting bars 142 are spaced apart and arranged parallel to each other in the left-right direction. The handle bar 141 is connected between the rear ends of the two connecting bars 142, and the front ends of the two connecting bars 142 are rotatably connected to the aforementioned cross-link 130. In some preferred embodiments, the push handle frame 140 and the cross-link 130 are equipped with a locking structure. After the push handle frame 140 is adjusted by rotation, the locking structure can be used to lock the push handle frame 140. When the push handle frame 140 needs to be adjusted again or folded, the locking structure needs to be unlocked. In some preferred embodiments, the vehicle is equipped with a brake device, and the push handle frame 140 is equipped with a brake handle, which can be used to control the brake device to brake the vehicle.

[0046] Example 2

[0047] See also Figure 7 、 Figure 8 As shown, the main difference between this embodiment and embodiment 1 is that the carrier in this embodiment is not provided with a coupling structure 800. In this embodiment, the carrier includes an adapter 500, which is rotatably connected to the carrier body 100 around the rotation center line, and the rear wheel assembly 300 is connected to the adapter 500. The rear wheel assembly 300 is switched between the first position and the second position by the front and rear swinging of the adapter 500. Specifically, the adapter 500 has an adapter portion 511 and a mounting portion 512 that are spaced apart. The adapter portion 511 can be rotatably connected to the carrier body 100 around the rotation center line, and the rear wheel assembly 300 is connected to the mounting portion 512. When the adapter 500 swings around the rotation center line, the mounting portion 512 changes its position in the front and rear directions, so that the rear wheel assembly 300 switches between the first position and the second position. Specifically, see Figure 7 As shown, when the rear wheel assembly 300 is in the first position, the adapter 500 gradually extends backward from the adapter portion 511 to the mounting portion 512, and the mounting portion 512 is located on the rear side of the adapter portion 511; when the rear wheel assembly 300 is in the second position, the adapter 500 extends forward from the adapter portion 511 to the mounting portion 512, and the mounting portion 512 moves to the front side of the adapter portion 511.

[0048] In this embodiment, the axis of the axle 310 is parallel to the rotation centerline, and the axle 310 is rotatably connected to the mounting portion 512 about its own axis. In other embodiments, the axle 310 is fixed to the mounting portion 512, and the wheel body 320 is rotatably mounted on the axle 310 about its axis.

[0049] In this embodiment, as the adapter 500 rotates, the angle between the adapter 500 and the horizontal plane changes, and the distance between the rotation centerline and the axis of the wheel axle 310 in the fore-aft direction changes. When the rear wheel assembly 300 is in the first and second positions, the axis of the wheel axle 310 is at the same height, so that the height of the support body 100 does not change between the first and second usage states. In other embodiments, the height of the axis of the wheel axle 310 changes between the first and second positions, resulting in different heights of the support body 100 between the first and second usage states.

[0050] In this embodiment, the adapter 500 comprises two adapter rods 510 spaced apart in the left-right direction. One end of each adapter rod 510 is connected to the carrier body 100 via a locking member 600. The wheel axle 310 is rotatably connected to the other ends of the two adapter rods 510 about its own axis. The two ends of the adapter rods 510 respectively constitute the aforementioned adapter portion 511 and mounting portion 512. In this embodiment, the locking member 600 is a bolt, the axis of which extends colinearly with the rotational centerline. When the rear wheel assembly 300 is in the first or second position, tightening the bolt secures the adapter rod 510 relative to the carrier body 100, thereby stably maintaining the rear wheel assembly 300 in the first or second position. To adjust the position of the rear wheel assembly 300, the bolt is rotated in the opposite direction to loosen it, and then the adapter rod 510 is rotated. When the desired position is reached, the bolt is tightened again to lock the adapter rod 510.

[0051] Example 3

[0052] See also Figure 9 、 Figure 10 As shown, the main difference between this embodiment and embodiment 1 is that: in this embodiment, the carrier is not provided with a coupling structure 800. In this embodiment, the carrier includes a mounting seat 700, and the mounting seat 700 is fixedly provided on the carrier body 100. The rear wheel assembly 300 can be slidably connected to the mounting seat 700 in the front-to-back direction, and the rear wheel assembly 300 realizes the conversion between the first position and the second position by sliding back and forth.

[0053] Specifically, the mounting base 700 includes two slide bars 710 spaced apart in the left-right direction. The slide bars 710 extend in the front-to-back direction, and the wheel axle 310 is slidably connected to the slide bars 710 along the length of the slide bars 710. In this embodiment, each slide bar 710 is provided with a slide groove 720 extending in the front-to-back direction, and the wheel axle 310 is slidably inserted into the slide grooves 720 on both sides. Figure 9 、 Figure 10 As shown, when the axle 310 is located at the rear end of the slide groove 720, the rear wheel assembly 300 is located at the first position, and when the axle 310 slides to the front end of the slide groove 720, the rear wheel assembly 300 is converted to the second position.

[0054] In some embodiments, the wheel axle 310 has multiple switchable positions in the slide groove 720, and the corresponding rear wheel assembly 300 also has multiple switchable positions, and the vehicle also has multiple switchable usage states.

[0055] In this embodiment, a front link 730 and a rear link 740 are fixed to each side of the slide bar 710. Both the front link 730 and the rear link 740 extend in the vertical direction and are fixed to the carrier body 100. The distance between the first connection point where the front link 730 is fixed to the carrier body 100 and the second connection point where the rear link 740 is fixed to the carrier body 100 is less than the length of the slide bar 710. This arrangement allows the rear wheel assembly 300 to be adjusted a greater distance in the front-to-back direction.

[0056] In summary, in all of the above-described embodiments, by adjusting the position of the rear wheel assembly 300 on the load-bearing body 100, the wheelbase between the front wheel assembly 200 and the rear wheel assembly 300 can be changed, thereby adjusting the stability and turning flexibility of the vehicle. This also allows the vehicle to be converted between two usage modes: a pushcart and a trailer. In trailer mode, the front wheel assembly 200 can be removed to further increase the vehicle's flexibility. Users can adjust the rear wheel assembly 300 as needed, ensuring that the vehicle achieves a balance between load stability and turning flexibility in different usage scenarios.

[0057] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A vehicle, characterized in that: The vehicle comprises a carrying body, a front wheel assembly and a rear wheel assembly arranged at the bottom of the carrying body, wherein the front wheel assembly is detachably or movably connected to the carrying body, and the mounting position of the rear wheel assembly on the carrying body can be adjusted along the front-rear direction. The vehicle has a first usage state and a second usage state. In the first usage state, the front wheel assembly and the rear wheel assembly are spaced apart in the front-to-rear direction and are jointly supported on the ground, and the rear wheel assembly is installed at a first position on the carrying body. In the second usage state, the vehicle is supported on the ground by the rear wheel assembly, and the rear wheel assembly is installed at a second position on the carrying body, wherein the second position is located in front of the first position.

2. The carrier according to claim 1, characterized in that: The carrier further includes a traction rod, which is detachably or movably connected to the carrier body. When the carrier is in the first use state, the traction rod is detached from the carrier body or retracted relative to the carrier body. When the carrier is in the second usage state, the traction rod extends forward from the front of the carrying body.

3. The carrier according to claim 1, characterized in that: The carrier also includes an adapter, which has an adapter portion and a mounting portion arranged at intervals. The adapter portion can be rotatably connected to the carrying body around a rotation center line, and the rear wheel assembly is connected to the mounting portion. When the adapter swings around the rotation center line, the mounting portion changes position in the front and rear directions, so that the rear wheel assembly switches between the first position and the second position.

4. The carrier according to claim 3, characterized in that: The rear wheel assembly has an axle, the axis of the axle is parallel to the rotation center line, and the axle is rotatably connected to the mounting portion around its own axis. When the angle between the adapter and the horizontal plane changes, the distance between the rotation center line and the axis of the axle in the front-to-back direction changes, wherein when the rear wheel assembly is in the first position and the second position, the axis of the axle is at the same height.

5. The carrier according to claim 4, characterized in that: When the rear wheel assembly is in the first position, the adapter extends gradually and obliquely backward from the adapter portion to the mounting portion; when the rear wheel assembly is in the second position, the adapter extends obliquely forward from the adapter portion to between the mounting portions, and / or, The adapter has two adapter rods arranged at intervals in the left-right direction, one end of each of the two adapter rods is connected to the supporting body through a locking member, and the wheel axle is connected to the other end of the two adapter rods so as to be rotatable around its own axis, wherein the locking member is a bolt, and the axis of the bolt extends colinearly with the rotation centerline.

6. The carrier according to claim 1, characterized in that: The carrier further comprises a mounting seat, which is fixedly arranged on the carrying body, and the rear wheel assembly is slidably connected to the mounting seat along the front-rear direction.

7. The carrier according to claim 6, characterized in that: The mounting seat includes two sliding rods arranged at intervals along the left and right directions, and the sliding rods extend along the front and rear directions. The rear wheel assembly includes an axle, and the axle can be slidably connected to the sliding rods along the length extension direction of the sliding rods, wherein the sliding rods on each side are provided with a sliding groove extending along the front and rear directions, and the axle is slidably inserted into the sliding grooves on both sides.

8. The carrier according to claim 7, characterized in that: The sliding rod on each side is fixed with a front link and a rear link, and the front link and the rear link extend in the up-down direction and are fixed to the carrying body, wherein the distance between the first connection position where the front link is fixed on the carrying body and the second connection position where the rear link is fixed on the carrying body is less than the length of the sliding rod.

9. The carrier according to claim 1, characterized in that: The carrying body is provided with a plurality of coupling structures, which are distributed at intervals along the front-rear direction, and the rear wheel assembly is detachably connected to the coupling structures.

10. The carrier according to any one of claims 1 to 9, characterized in that: The rear wheel assembly includes a wheel axle and two wheel bodies respectively provided at the two ends of the wheel axle, the carrying body is located between the two wheel bodies in the left-right direction, and the wheel axle is entirely located below the carrying body; The load-bearing body includes a base frame and a side frame arranged on the base frame. The side frame and the base frame cooperate with each other to form a accommodating space. The front wheel assembly and the rear wheel assembly are both installed on the base frame. The base frame has a horizontal load-bearing surface, and the wheel body is at least partially higher than the load-bearing surface.

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