stroller

Abstract

The present application relates to a kind of cart, including the frame with unfolded state and folding state, front wheel assembly and rear wheel assembly are arranged in the bottom of the frame, unfolded state, frame includes: the front support that is inclined and extends rearwards from bottom to top, the front wheel assembly is arranged in the lower portion of the front support;Upper support that is inclined and extends rearwards from bottom to top;The rear support that is inclined and extends forwards from bottom to top, the rear wheel assembly is arranged in the lower portion of the rear support;Rear support frame assembly, including the upper support frame and lower support frame respectively extending in up-down direction, the lower portion of the upper support frame is rotatably connected with the upper portion of the lower support frame, the upper portion of the upper support frame is rotatably connected with the upper portion of the upper support frame;Bottom support frame assembly, including the front support frame and rear support frame respectively extending in front-back direction, the front portion of front support frame is rotatably connected with the lower portion of the front support, the structure of the cart is simple, folding operation is simple, the volume of folding frame is small, after removing front and rear wheel assembly, it is convenient to store and transport.

Description

Technical Field

[0001] This invention relates to a trolley. Background Technology

[0002] In the existing technology, the structures of foldable trolleys vary, and the folding principles are also different. Most of them have complex structures and cumbersome folding operations. Even after folding, the trolley is still large in size, which is not convenient for daily storage and organization, and also causes great difficulties in its packaging and transportation. Therefore, how to reduce the overall size of the trolley after folding while providing stable load-bearing support has become a goal that those skilled in the art have been pursuing. Summary of the Invention

[0003] The purpose of this invention is to provide a new type of trolley.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a trolley, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, wherein the frame in the unfolded state includes:

[0005] A front support bracket that extends rearward at an angle from bottom to top, with the front wheel assembly located at the lower part of the front support bracket;

[0006] The upper support extends backward at an angle from bottom to top;

[0007] The rear support extends forward at an angle from bottom to top. Two of the three components—the upper part of the front support, the lower part of the upper support, and the upper part of the rear support—are rotatably connected, and the third component is rotatably connected to one of the aforementioned two components. Alternatively, the upper part of the front support, the lower part of the upper support, and the upper part of the rear support are rotatably connected about the same rotation center line. The rear wheel assembly is located on the lower part of the rear support.

[0008] The rear support assembly includes an upper support and a lower support extending in the vertical direction, the lower part of the upper support is rotatably connected to the upper part of the lower support, and the upper part of the upper support is rotatably connected to the upper part of the upper bracket.

[0009] The base support assembly includes a front support and a rear support extending in a front-rear direction, the front part of the front support is rotatably connected to the lower part of the front bracket, the rear part of the front support is rotatably connected to the front part of the rear support, and two of the rear part of the rear support, the lower part of the lower support, and the lower part of the rear bracket are rotatably connected and the third part is rotatably connected to one of the aforementioned two, or the rear part of the rear support, the lower part of the lower support, and the lower part of the rear bracket are rotatably connected about the same rotation center line.

[0010] Preferably, when the frame is in the unfolded state, the front support and the upper support are connected sequentially along the length direction, the front support and the rear support extend along the same length direction, the upper support and the lower support extend along the same length direction, and the front support, the upper support, the rear support assembly and the bottom support assembly cooperate with each other to form an accommodating space.

[0011] Furthermore, when the frame is in a folded state, the front support and the rear support are converted to extend in the vertical direction and retract into each other between the front support and the rear support, and the upper support and the lower support are flipped and folded in the vertical direction and retracted between the rear support and the upper support.

[0012] Preferably, the upper part of the front bracket is rotatably connected to the upper part of the rear bracket about a first rotation center line, and the lower part of the upper bracket is rotatably connected to the upper part of the rear bracket about a second rotation center line. The first rotation center line and the second rotation center line both extend in the left-right direction and are parallel to each other. The rotation linkage of the upper bracket relative to the rear bracket causes the front bracket to be rotatably set relative to the rear bracket.

[0013] Furthermore, a sliding member is provided on one of the upper part of the front bracket and the lower part of the upper bracket, and a sliding groove is provided on the other. The sliding member is slidably disposed in the sliding groove and is rotatably disposed relative to at least one of the upper part of the front bracket and the lower part of the upper bracket.

[0014] Furthermore, the sliding element is a sliding pin, the axis of which is parallel to the first rotation center line and the second rotation center line. The sliding pin can both rotate around its own axis and slide in the groove.

[0015] Preferably, the lower part of the rear bracket, the rear part of the rear support frame, and the lower part of the lower support frame are rotatably connected around a third rotation center line.

[0016] Furthermore, the lower part of the rear support has a rear crossbar extending in the left-right direction, and the rear wheel assembly has two sets of rear wheels respectively disposed on the left and right sides. The two sets of rear wheels are respectively installed at the left and right ends of the rear crossbar. When the frame is in the unfolded state, the axis of the rear crossbar is located behind the third rotation center line.

[0017] Preferably, the frame further includes a push rod frame, one end of which is rotatably connected to the upper part of the upper support frame or rotatably connected to the upper part of the upper bracket, or one end of the push rod frame, the upper part of the upper support frame, and the upper part of the upper bracket are rotatably connected about the same rotation center line.

[0018] Preferably, a bottom crossbar extending in the left-right direction is provided at the rear of the front support frame or the front of the rear support frame, and the bottom crossbar moves upward during the process of the frame changing from the unfolded state to the folded state.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention has fewer trolley rods, the folding operation is simple, and the folded trolley frame is flat and can stand upright on the ground by relying on the front and rear wheel assemblies. Attached Figure Description

[0020] Appendix Figure 1 This is a three-dimensional structural diagram of a trolley in an unfolded state according to a specific embodiment of the present invention.

[0021] Appendix Figure 2 For the appendix Figure 1 A side view diagram;

[0022] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the mid-frame;

[0023] Appendix Figure 4 For the appendix Figure 1 A diagram illustrating the explosion of the cart (excluding the rear wheels);

[0024] Appendix Figure 5 For the appendix Figure 1 A three-dimensional structural diagram of the stroller in its folded state;

[0025] Appendix Figure 6 For the appendix Figure 5 A side view diagram;

[0026] Appendix Figure 7 For the appendix Figure 1 A side view of the stroller during the folding process (excluding the rear wheels);

[0027] Appendix Figure 8 For the appendix Figure 7 Enlarged view of point A in the middle;

[0028] Appendix Figure 9 For the appendix Figure 7 A side view diagram of the second step in the folding process of the stroller;

[0029] Appendix Figure 10 For the appendix Figure 7 A side view of the stroller after it has been further folded;

[0030] Appendix Figure 11 For the appendix Figure 10 Enlarged view of point B in the middle;

[0031] Appendix Figure 12 For the appendix Figure 7A side view of the stroller in its folded state;

[0032] Appendix Figure 13 For the appendix Figure 12 Enlarged view of point C in the middle;

[0033] Appendix Figure 14 This is a schematic diagram of a second connection method for the front bracket, upper bracket, and rear bracket;

[0034] Appendix Figure 15 This is a schematic diagram of a third connection method for the front bracket, upper bracket, and rear bracket;

[0035] Appendix Figure 16 This is a schematic diagram of a fourth connection method for the front bracket, upper bracket, and rear bracket;

[0036] Among them: 100, frame; 200, front wheel assembly; 201, front wheel; 202, front wheel mount; 300, rear wheel assembly; 301, rear wheel;

[0037] 1. Front bracket; 11. Front support rod; 12. Front crossbar; 13. Front connector; 14. Slide groove;

[0038] 2. Upper bracket; 21. Upper support rod; 22. Upper crossbar; 23. Sliding component;

[0039] 3. Rear bracket; 31. Rear support rod; 32. Rear crossbar; 33. Rear connector; 34. Upper connector; 341. Upper connecting part; 342. Lower connecting part;

[0040] 4. Rear support frame assembly; 41. Upper support frame; 411. Upper support rod; 42. Lower support frame; 421. Lower support rod;

[0041] 5. Bottom support frame assembly; 51. Front support frame; 511. Front support rod; 52. Rear support frame; 521. Rear support rod; 522. Bottom crossbar;

[0042] 6. Push rod bracket; 61. Push rod part; 62. Grip part; 7. Connecting seat;

[0043] X1, First rotation center line; X2, Second rotation center line; X3, Third rotation center line; X4, Fourth rotation center line; X5, Fifth rotation center line; X6, Sixth rotation center line. Detailed Implementation

[0044] The following descriptions of directions such as up, down, left, right, front, back, inside, and outside are defined with reference to the directions observed by the person pushing the cart when it is in the unfolded state. The purpose is solely to clearly illustrate the relative positional relationships of the various rods and components on the cart.

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] See Figures 1 to 6 The trolley shown has a frame 100 in an unfolded state and a folded state, a front wheel assembly 200 and a rear wheel assembly 300 located at the bottom of the frame 100. In the unfolded state, the frame 100 includes:

[0047] The front bracket 1 extends backward at an angle from bottom to top, and the front wheel assembly 200 is located at the lower part of the front bracket 1.

[0048] Upper support 2 extends backward at an angle from bottom to top;

[0049] The rear support 3 extends forward at an angle from bottom to top. Two of the three parts—the upper part of the front support 1, the lower part of the upper support 2, and the upper part of the rear support 3—are rotatably connected, and the third part is rotatably connected to one of the aforementioned two parts. Alternatively, the three parts—the upper part of the front support 1, the lower part of the upper support 2, and the upper part of the rear support 3—are rotatably connected around the same rotation center line. The rear wheel assembly 300 is located at the lower part of the rear support 3.

[0050] The rear support assembly 4 includes an upper support 41 and a lower support 42 extending in the vertical direction, respectively. The lower part of the upper support 41 is rotatably connected to the upper part of the lower support 42, and the upper part of the upper support 41 is rotatably connected to the upper part of the upper bracket 2.

[0051] The bottom support assembly 5 includes a front support 51 and a rear support 52 extending in the front-rear direction, respectively. The front part of the front support 51 is rotatably connected to the lower part of the front bracket 1, and the rear part of the front support 51 is rotatably connected to the front part of the rear support 52. Two of the three parts of the rear support 52, the lower part of the lower support 42, and the lower part of the rear bracket 3 are rotatably connected, and the third part is rotatably connected to one of the aforementioned two parts. Alternatively, the three parts of the rear support 52, the lower part of the lower support 42, and the lower part of the rear bracket 3 are rotatably connected around the same rotation center line.

[0052] Referring to the accompanying drawings, the specific structures of each part of the frame 100 in this embodiment are as follows:

[0053] The front support 1 includes a front strut 11 extending vertically, a front crossbar 12 extending horizontally, and a front connector 13 fixed to the lower part of the front support 1 and extending rearward. The front strut 11 includes two sets located on the left and right sides, which are parallel to each other and spaced apart. The front crossbar 12 connects the lower ends of the two sets of front struts 11. The front connector 13 includes two sets located on the left and right sides, which are fixed to the lower parts of the two sets of front struts 11 respectively. When the frame 100 is unfolded, the front connector 11 extends in the front-rear direction, with its front end fixed to the front strut 11 and extending rearward from the bottom of the front strut 11. The front wheel assembly 200 includes two sets located on the left and right sides. Each set of front wheel assemblies 200 includes a front wheel 201 and a front wheel seat 202. The two sets of front wheel seats 202 are respectively connected to the left end and the right end of the front crossbar 12. The two sets of front wheels 201 are rotatably connected to the corresponding front wheel seat 202 through the front wheel axle.

[0054] See Figures 1 to 4 As shown, the upper support 2 includes two sets of upper support rods 21 located on the left and right sides. Both sets of upper support rods 21 extend in the vertical direction. In this embodiment, the upper support 2 is also provided with an upper crossbar 22. The upper crossbar 22 is a U-shaped rod with an opening facing backward. It is connected between the middle of the two sets of upper support rods 21 in the left and right direction.

[0055] The rear support 3 has a rear support rod 31 extending in the vertical direction, a rear crossbar 32 extending in the horizontal direction, and a rear connector 33 fixed to the lower part of the rear support 3 and extending rearward. The rear support rod 31 includes two sets located on the left and right sides, and the two sets of rear support rods 31 are arranged parallel to each other and spaced apart. The rear connector 33 includes two sets located on the left and right sides, and the two sets of rear connectors 33 are respectively fixed to the lower ends of the two sets of rear support rods 31. When the frame 100 is unfolded, the rear connector 33 extends in the front and rear directions, and its front end is fixed to the rear support rod 31 and extends rearward from the lower end of the rear support rod 31. The rear crossbar 32 is connected between the rear ends of the two sets of rear connectors 33 in the horizontal direction. The rear wheel assembly 300 has two sets of rear wheels 301 disposed on the left and right sides respectively. The two sets of rear wheels 301 are respectively installed at the left and right ends of the rear crossbar 32 and rotate along the axis of the rear crossbar 32. In this embodiment, the size of the rear wheel 301 is larger than the size of the front wheel 201.

[0056] In this embodiment, see Figure 1 , Figure 3 As shown, the upper part of the front bracket 1 is rotatably connected to the upper part of the rear bracket 3 about a first rotation center line X1, and the lower part of the upper bracket 2 is rotatably connected to the upper part of the rear bracket 3 about a second rotation center line X2. Specifically, see [link to documentation]. Figure 5 , Figure 8As shown, the rear support 3 is provided with an upper connector 34, which includes two sets of upper connectors located on the upper parts of the left and right rear support rods 31. The upper connector 34 is T-shaped and has an upper connecting portion 341 extending in the front-rear direction and a lower connecting portion 342 extending downward from the middle of the upper connecting portion 341 in a direction perpendicular to the extension of the upper connecting portion 341. The lower connecting portions 342 of the two sets of upper connectors 34 are fixedly connected to the upper ends of the two sets of rear support rods 31 respectively. On the left and right sides of the frame 100, the upper part of the front support rod 11 is rotatably connected to the front part of the upper connector 341 around the first rotation center line X1, and the lower part of the upper support rod 21 is rotatably connected to the rear part of the upper connector 341 around the second rotation center line X2. The first rotation center line X1 and the second rotation center line X2 both extend in the left-right direction and are parallel to each other.

[0057] In addition to the connection methods described above, the upper part of the front bracket 1, the upper part of the rear bracket 3, and the lower part of the upper bracket 2 can also be connected in the following manner: See Figure 14 As shown, the upper ends of the front support rod 11, the upper ends of the rear support rod 31, and the lower ends of the upper support rod 21 are rotatably connected about the same rotation center line; or, see [link to diagram]. Figure 15 As shown, a connecting seat 7 is fixedly provided at the lower part of the upper support rod 21 or the upper part of the rear support rod 31. The connecting seat 7 is located between the front support rod 11 and the upper support rod 21. The upper end of the front support rod 11 is rotatably connected to the front part of the connecting seat 7, and the lower end of the upper support rod 21 is rotatably connected to the upper end of the rear support rod 31; or see [other details]. Figure 16 As shown, the connecting seat 7 is fixed to the upper part of the rear support rod 31 and located between the front support rod 11 and the upper support rod 21. The upper end of the front support rod 11 is rotatably connected to the upper end of the rear support rod 31, and the lower end of the upper support rod 21 is rotatably connected to the rear part of the connecting seat 7.

[0058] In this embodiment, the rotational linkage of the upper bracket 2 relative to the rear bracket 3 causes the front bracket 1 to be rotatably configured relative to the rear bracket 3. Specifically, it can be configured such that a sliding member 23 is provided on one of the upper part of the front bracket 1 and the lower part of the upper bracket 2, and a sliding groove 14 is provided on the other. The sliding member 23 is slidably disposed in the sliding groove 14, and the sliding member 23 is rotatably configured relative to at least one of the upper part of the front bracket 1 and the lower part of the upper bracket 2. In this embodiment, see [reference needed]. Figure 8 , Figure 11 and Figure 13As shown, a sliding member 23 is fixed at the lower end of each of the two sets of upper support rods 21, and a sliding groove 14 extending in the front-rear direction is provided at the upper end of each of the two sets of front support rods 11. The sliding member 23 is a sliding pin, and the axis of the sliding pin is parallel to the first rotation center line X1 and the second rotation center line X2. When the frame is in the unfolded state, the axis of the sliding pin is located between the first rotation center line X1 and the second rotation center line X2 in the front-rear direction. The sliding pin is both able to rotate around its own axis and slide in the sliding groove 14.

[0059] In this embodiment, the lower part of the rear support 3, the rear part of the rear support frame 52, and the lower part of the lower support frame 42 are rotatably connected around the third rotation center line X3. Specifically, the lower support frame 42 includes two sets of lower support rods 421 located on the left and right sides, and the rear support frame 52 includes two rear support rods 521 located on the left and right sides. In the unfolded state, the two lower support rods 421 extend from bottom to top and rearward. The two rear support rods 521 extend in the front-rear direction and are located on each side of the frame 100. The lower ends of the lower support rods 421, the lower ends of the rear support rods 31, and the rear ends of the rear support rods 521 are rotatably connected around the third rotation center line X3. The third rotation center line X3, the first rotation center line X1, and the second rotation center line X2 all extend in the left-right direction and are parallel to each other. The axis of the rear crossbar 32 is located behind the third rotation center line X3.

[0060] See Figures 1 to 4 As shown, the upper support frame 41 includes two upper support rods 411 located on the left and right sides, and the front support frame 51 includes two front support rods 511 located on the left and right sides. In the unfolded state, the two upper support rods 411 extend from bottom to top and rearward, and the two front support rods 511 extend in the front-rear direction. On each side of the frame 100, the upper end of the lower support rod 421 is rotatably connected to the lower end of the upper support rod 411 around the fourth rotation center line X4. The upper end of the upper support rod 411 is rotatably connected to the rear end of the upper support rod 21 around the fifth rotation center line X5. The rear end of the front support rod 511 is rotatably connected to the front end of the rear support rod 521 around the sixth rotation center line. The fourth rotation center line X4, the fifth rotation center line X5, and the sixth rotation center line X6 are parallel to each other and all extend in the left-right direction. A locking mechanism (not shown in the figure) is also provided between the upper support frame 41 and the lower support frame 42 to restrict the relative rotation between the two.

[0061] The rear part of the front support frame 51 or the front part of the rear support frame 52 is also provided with a bottom crossbar 522 extending in the left and right direction. In this embodiment, the bottom crossbar 522 is provided between the front parts of the two sets of rear support frames 521, and the axis of the bottom crossbar 522 extends collinearly with the sixth rotation center line X6.

[0062] The frame 100 also includes a pushrod bracket 6, see [link / reference] Figure 3As shown, one end of the push rod frame 6 is rotatably connected to the upper part of the upper support frame 41 or rotatably connected to the upper part of the upper bracket 2, or one end of the push rod frame 6, the upper part of the upper support frame 41, and the upper part of the upper bracket 2 are rotatably connected around the same rotation center line. In this embodiment, the push rod frame 6 is integrally formed. In the unfolded state, the push rod frame 6 is a U-shaped rod with an opening facing forward. The push rod frame 6 has a push rod part 61 extending in the front-back direction and a grip part 62 extending in the left-right direction. The push rod part 61 includes two sets located on the left and right sides. The front ends of the two sets of push rod parts 61 are rotatably connected around the fifth rotation center line X5 to the upper end of the upper support rod 411 and the rear end of the upper support rod 21 on the same side, respectively. The grip part 62 is connected between the rear ends of the two sets of push rod parts 61 in the left-right direction.

[0063] The frame 100 is in the unfolded state, see [reference]. Figure 1 , Figure 2 As shown, the front support 1 and the upper support 2 are connected sequentially along the length direction. On the left and right sides of the frame 100, the front support rod 11 and the upper support rod 21, which are connected together, form an upward arched arc. The front support frame 51 and the rear support frame 52 extend along the same length direction, and the upper support frame 41 and the lower support frame 42 extend along the same length direction. The front support 1, the upper support 2, the rear support frame assembly 4, and the bottom support frame assembly 5 cooperate with each other to form an accommodating space. At the same time, the front support frame 51 and the rear support frame 52 cooperate to form a support platform. Items can be placed in the accommodating space and placed on the support platform, or a child can be placed in the accommodating space and sit on the support platform. The pusher can hold the handle 62 and push forward to drive the stroller forward.

[0064] When the frame 100 transitions from the unfolded state to the folded state, see [reference needed]. Figures 7 to 13 As shown, the push rod frame 6 is flipped forward around the fifth rotation center line so that it folds relative to the upper support 2; then the locking mechanism between the upper support frame 41 and the lower support frame 42 is released, and the connection between the two is driven forward, causing the upper support frame 41 to flip downward, while the lower support frame 42 rotates forward, and the two approach each other and fold towards each other; the upper end of the upper support frame 41 drives the upper support 2 to flip downward, and the upper support 2 drives the upper end of the rear support 3 to rotate backward, while the upper support 2, through the linkage of the sliding member 23, causes the front support 1 to fold backward. During this process, the sliding member 23 slides forward relative to the slide groove 14 first, and then slides backward to the rear end of the slide groove 14; the front support 1 drives the front support frame 51 to move backward, while driving the connection between the front support frame 51 and the rear support frame 52 to move upward and fold relative to each other, and the bottom crossbar 522 moves upward together.

[0065] When folding the frame 100, after folding the push rod frame 6 and the upper support 2 together, the locking mechanism between the upper support frame 41 and the lower support frame 42 can be released. The user can then lift the bottom crossbar 522 upwards to achieve the folding of the front support frame 51 and the rear support frame 52 towards each other and the folding of the front support 1 backwards. The backward movement of the front support 1 causes the upper support 2 to flip downwards and drives the upper support frame 41 and the lower support frame 42 to fold relative to each other, so that the frame 100 can be folded up as a whole during the process of lifting the bottom crossbar 522 upwards.

[0066] The frame 100 is in a folded state, see [link / reference]. Figure 5 , Figure 6 and Figure 12 As shown, the front support 1, rear support 3, and upper support 2 are folded together from front to back. The front support 51 and rear support 52 are converted to extend in the vertical direction and fold together between the front support 1 and rear support 3. The upper support 41 and lower support 42 are flipped and folded in the vertical direction and folded together between the rear support 3 and upper support 2. The front wheel assembly 200 and rear wheel assembly 300 are folded together. The two sets of front wheel assemblies 200 are folded together between the two sets of rear wheels 301 in the left and right direction. In this state, the front wheel assembly 200 and the rear wheel assembly 300 are supported on the ground together.

[0067] In summary, the trolley structure of this embodiment is simple and the folding principle is simple. The folding of the entire trolley can be completed by only two steps: flipping and pushing forward or flipping and lifting up. The folded frame 100 is flat at the front and back, and the folded trolley can stand upright on the ground by relying on the front wheel assembly 200 and the rear wheel assembly 300. After removing the front wheel assembly 200 and the rear wheel assembly 300, the overall size of the trolley can be further reduced, which makes it easier to reduce the size of the packaging box and facilitates storage and transportation.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A trolley, comprising a frame having an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly disposed at the bottom of the frame, characterized in that: In its unfolded state, the frame includes: A front support bracket that extends rearward at an angle from bottom to top, with the front wheel assembly located at the lower part of the front support bracket; The upper support extends backward at an angle from bottom to top; The rear support extends forward at an angle from bottom to top. Two of the three components—the upper part of the front support, the lower part of the upper support, and the upper part of the rear support—are rotatably connected, and the third component is rotatably connected to one of the aforementioned two components. Alternatively, the upper part of the front support, the lower part of the upper support, and the upper part of the rear support are rotatably connected about the same rotation center line. The rear wheel assembly is located on the lower part of the rear support. The rear support assembly includes an upper support and a lower support extending in the vertical direction, the lower part of the upper support is rotatably connected to the upper part of the lower support, and the upper part of the upper support is rotatably connected to the upper part of the upper bracket. The base support frame assembly includes a front support frame and a rear support frame extending in the front-rear direction, respectively. The front part of the front support frame is rotatably connected to the lower part of the front bracket, and the rear part of the front support frame is rotatably connected to the front part of the rear support frame. Two of the three components—the rear part of the rear support frame, the lower part of the lower support frame, and the lower part of the rear bracket—are rotatably connected, and the third component is rotatably connected to one of the aforementioned two components. Alternatively, the rear part of the rear support frame, the lower part of the lower support frame, and the lower part of the rear bracket are rotatably connected about the same rotation center line. When the vehicle frame is in the unfolded state, the front support frame and the rear support frame cooperate to form a support platform.

2. The trolley according to claim 1, characterized in that: When the frame is in the unfolded state, the front support and the upper support are connected sequentially along the length direction, the front support and the rear support extend along the same length direction, the upper support and the lower support extend along the same length direction, and the front support, the upper support, the rear support assembly and the bottom support assembly cooperate with each other to form an accommodating space.

3. The trolley according to claim 1, characterized in that: When the frame is in a folded state, the front support and the rear support are converted to extend vertically and retract into each other between the front support and the rear support, and the upper support and the lower support are flipped and folded vertically and retracted between the rear support and the upper support.

4. The trolley according to claim 1, characterized in that: The upper part of the front bracket is rotatably connected to the upper part of the rear bracket around a first rotation center line, and the lower part of the upper bracket is rotatably connected to the upper part of the rear bracket around a second rotation center line. The first rotation center line and the second rotation center line both extend in the left-right direction and are parallel to each other. The rotation linkage of the upper bracket relative to the rear bracket causes the front bracket to be rotatably set relative to the rear bracket.

5. The trolley according to claim 4, characterized in that: A sliding member is provided on one of the upper part of the front bracket and the lower part of the upper bracket, and a sliding groove is provided on the other. The sliding member is slidably disposed in the sliding groove and is rotatably disposed relative to at least one of the upper part of the front bracket and the lower part of the upper bracket.

6. The trolley according to claim 5, characterized in that: The sliding element is a sliding pin, and the axis of the sliding pin is parallel to the first rotation center line and the second rotation center line. The sliding pin can both rotate around its own axis and slide in the sliding groove.

7. The trolley according to claim 1, characterized in that: The lower part of the rear bracket, the rear part of the rear support frame, and the lower part of the lower support frame are rotatably connected around the third rotation center line.

8. The trolley according to claim 7, characterized in that: The lower part of the rear support has a rear crossbar extending in the left-right direction. The rear wheel assembly has two sets of rear wheels respectively located on the left and right sides. The two sets of rear wheels are respectively installed at the left and right ends of the rear crossbar. When the frame is in the unfolded state, the axis of the rear crossbar is located behind the third rotation center line.

9. The trolley according to claim 1, characterized in that: The frame also includes a push rod frame, one end of which is rotatably connected to the upper part of the upper support frame or rotatably connected to the upper part of the upper bracket, or one end of the push rod frame, the upper part of the upper support frame, and the upper part of the upper bracket are rotatably connected about the same rotation center line.

10. The stroller according to any one of claims 1 to 9, characterized in that: A bottom crossbar extending in the left-right direction is provided at the rear of the front support frame or the front of the rear support frame. During the process of the frame changing from an unfolded state to a folded state, the bottom crossbar moves upward.

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