Foldable rack and cart

Abstract

The utility model relates to the technical field of carts, and discloses a foldable rack and a cart. The foldable rack comprises a first connecting rod group, a second connecting rod group, a first connecting rod group and a second connecting rod group, a rotating part is arranged between the first connecting rod group and the second connecting rod group, and the rotating part has a first state and a second state; the third connecting rod group is hinged with the second connecting rod group; one end of the supporting rod piece set is connected to the first connecting rod set through a locking structure, and the other end of the supporting rod piece set is hinged to the third connecting rod set. When the locking structure is in the unlocking state, the rotating part is in the first state, the first connecting rod set rotates towards the third connecting rod set around the locking structure, and when the first connecting rod set rotates to the second state of the rotating part, the first connecting rod set drives the second connecting rod set to rotate towards the third connecting rod set. Through the design of the rotating part and the locking structure, a user only needs to unlock the locking structure and then push the first connecting rod group, the whole rack can be folded, and the folding process is greatly simplified.

Description

Technical Field

[0001] This utility model relates to the field of trolley technology, specifically to a foldable frame and trolley. Background Technology

[0002] Strollers have become increasingly popular in families with infants due to their convenience and comfort. Currently, to better meet people's needs for portability and storage in strollers, most strollers are designed with a foldable structure.

[0003] A handcart typically consists of a handle assembly, a front leg assembly, and a rear leg assembly. After unlocking, each of these assemblies can rotate independently. When folding the handcart frame, each assembly must be manually folded separately. It is not possible to fold the entire handcart frame by driving only one component, making the folding process cumbersome. Utility Model Content

[0004] In view of this, the present invention provides a foldable frame and trolley to solve the problem that the current handcart frame requires manual folding of the push handle assembly, front leg assembly and rear leg assembly, which makes the folding of the handcart frame cumbersome.

[0005] In a first aspect, this utility model provides a foldable frame, comprising:

[0006] First connecting rod group;

[0007] The second connecting rod group has a rotating part between the first connecting rod group and the second connecting rod group. The rotating part has a first state in which the first connecting rod group rotates independently relative to the second connecting rod group and a second state in which the first connecting rod group and the second connecting rod group move synchronously.

[0008] The third connecting rod group is hinged to the second connecting rod group;

[0009] A support rod assembly, one end of which is connected to a support connector and connected to a first connecting rod assembly via a locking structure, and the other end of which is hinged to a third connecting rod assembly, wherein the locking structure has an unlocked state and a locked state;

[0010] When the locking structure is in the unlocked state, the rotating part is in the first state, and the first connecting rod group rotates around the locking structure toward the third connecting rod group. When the first connecting rod group rotates to the second state of the rotating part, the first connecting rod group drives the second connecting rod group to rotate toward the third connecting rod group so that the foldable frame can be folded up. When the locking structure is in the locked state, the positions of the first connecting rod group, the second connecting rod group, the third connecting rod group and the support rod group are relatively fixed.

[0011] The beneficial effects of the above-mentioned cart are:

[0012] The aforementioned trolley, with its rotating mechanism and locking structure, allows users to easily fold and unfold the entire frame simply by unlocking the locking mechanism and pushing the first connecting rod assembly. This greatly simplifies the folding process and improves the user experience. Similarly, when it is necessary to unfold the frame, simply unlock the locking mechanism and reverse the operation to quickly restore it to its usable state.

[0013] In the locked state, the positions of the first, second, and third connecting rod groups and the support rod group are relatively fixed, forming a stable structure that ensures the safety of the trolley during use. The second state of the rotating part allows the first and second connecting rod groups to move synchronously, enabling them to fold synchronously, which is very convenient.

[0014] The rack can be quickly folded into a compact shape using a linkage folding mechanism. It is lightweight, making it easy to carry and store. The folded size is significantly reduced, making it suitable for storage in various settings such as homes and vehicles. The rack can also stand upright when folded.

[0015] In one alternative embodiment, the rotating part includes:

[0016] The first rotating part is disposed at the bottom end of the first connecting rod assembly;

[0017] The second rotating part is disposed at the top of the second connecting rod assembly and cooperates with the first rotating part.

[0018] In one optional embodiment, the first rotating part includes:

[0019] A first rotating part body, wherein at least one first arc-shaped slide is provided on the first rotating part body;

[0020] At least one first protrusion is disposed on the body of the first rotating part and located at the bottom starting end of the first arc-shaped slide.

[0021] In one optional embodiment, the second rotating part includes:

[0022] The second rotating part body is rotatably connected to the first rotating part body, and at least one second arc-shaped slide is provided on the second rotating part body.

[0023] At least one second protrusion is disposed on the body of the second rotating part and located at the top end of the second arc-shaped slide.

[0024] The first protrusion is slidably fitted into the second arc-shaped slide rail, and the second protrusion is slidably fitted into the first arc-shaped slide rail;

[0025] When the first rotating part body has an upward rotational tendency relative to the second rotating part body, the first protrusion is limited by the second arc-shaped slide, and the second protrusion is limited by the first arc-shaped slide.

[0026] When the first rotating part body has a downward rotational tendency relative to the second rotating part body, the first protrusion slides upward along the second arc-shaped slide, and the first arc-shaped slide slides upward along the second protrusion.

[0027] The beneficial effects of the above technical solution are as follows: because both the first and second protrusions are limited when rotating upwards, the first connecting rod assembly cannot rotate upwards and can only rotate downwards, effectively preventing the user from accidentally rotating the frame upwards during operation and avoiding unnecessary malfunctions or damage. When folding the foldable frame, the user only needs to push the first connecting rod assembly downwards to achieve the folding of the frame; the operation direction is clear and simple.

[0028] In one optional embodiment, the first state of the rotating part is the entire state when the first protrusion slides from the bottom start end of the second arc-shaped slide to the top end end of the second arc-shaped slide. Thus, when the rotating part is in the first state, the body of the first rotating part can rotate relative to the body of the second rotating part.

[0029] The second state of the rotating part is when the first protrusion abuts against the top end of the second arc-shaped slide and the second protrusion abuts against the bottom beginning of the first arc-shaped slide. In this state, the first and second rotating parts are in a fully retracted position, and the angle between the first and second connecting rod groups is at its minimum. Continuing to rotate the first connecting rod group downwards causes it to move in tandem with the second connecting rod group. The first connecting rod group drives the second connecting rod group to rotate around the hinge position between the second and third connecting rod groups, thereby folding the second connecting rod group towards the third connecting rod group. Users can easily switch the frame from a fully extended state to a fully retracted state with a simple action, making the operation convenient and quick.

[0030] In one optional embodiment, the first rotating part body is provided with a rotating shaft, and the second rotating part body is provided with a positioning hole, wherein the rotating shaft is rotatably disposed within the positioning hole.

[0031] In one alternative embodiment, the first connecting rod assembly includes a push handle, the push handle having a first push handle member and a second push handle member, with a gap between the first push handle member and the second push handle member;

[0032] The second connecting rod assembly includes two second connecting rods spaced apart. The rotating part is provided between the first push handle and one of the second connecting rods, and between the second push handle and the other second connecting rod. A first reinforcing rod is provided between the two second connecting rods.

[0033] The third connecting rod group includes two third connecting rods spaced apart, with the top end of each third connecting rod hinged to the middle of the second connecting rod; a second reinforcing rod is provided between the two third connecting rods;

[0034] The support rod assembly includes two support rods spaced apart. One end of each support rod is connected to a first connecting rod assembly via a locking structure, and the other end of each support rod is hinged to a third connecting rod.

[0035] In one alternative embodiment, a fence is hinged between the two support rods, and a connecting piece is provided between the fence and the third connecting rod. The top end of the connecting piece is hinged to the fence, and the bottom end of the connecting piece is hinged to the third connecting rod.

[0036] The beneficial effects of the above technical solution are as follows: When the locking structure is in the locked state, the fence is stably supported by two connecting pieces, ensuring the stability of structures such as seats when they are installed on the fence. When the locking structure is in the unlocked state, the fence can rotate to achieve the folding and closing of the fence.

[0037] In one alternative implementation, the fence is provided with seats and / or covers.

[0038] Secondly, this utility model also provides a trolley, comprising:

[0039] Foldable rack;

[0040] Multiple wheels are provided at the bottom of the second and third connecting rod groups of the foldable frame.

[0041] The aforementioned trolley has the same technical effect as the foldable rack, and will not be described in detail here. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1A first-view structural diagram of a trolley when unfolded, as provided by this utility model;

[0044] Figure 2 A second-view structural diagram of a trolley when unfolded, provided by this utility model;

[0045] Figure 3 A front view of a trolley when unfolded, provided by this utility model;

[0046] Figure 4 A schematic diagram of the structure of a trolley when folded, provided by this utility model;

[0047] Figure 5 A schematic diagram of the structure of a trolley in its first state, provided by this utility model;

[0048] Figure 6 A schematic diagram of the structure of the first rotating part in a trolley provided by this utility model;

[0049] Figure 7 A schematic diagram of the structure of the second rotating part in a trolley provided by this utility model;

[0050] Figure 8 A schematic diagram of the structure of a trolley in its second state, provided by this utility model;

[0051] Figure 9 An exploded first-view view of a trolley in its second state, provided by this utility model;

[0052] Figure 10 An exploded view from a second perspective of the rotating part of a trolley in a second state, provided by this utility model;

[0053] Figure 11 First-view exploded view of a locking structure in a trolley provided by this utility model;

[0054] Figure 12 This is a second-view exploded view of a locking structure in a trolley provided by the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1. First connecting rod assembly; 11. First rotating part; 111. First rotating part body; 112. First protrusion; 113. First arc-shaped slide; 114. Rotating shaft; 12. Push handle.

[0057] 2. Second connecting rod assembly; 21. Second connecting rod; 23. Second rotating part; 231. Second rotating part body; 232. Second protrusion; 233. Second arc-shaped slide; 234. Positioning hole; 24. First reinforcing rod.

[0058] 3. Third connecting rod group; 31. Third connecting rod; 32. Second reinforcing rod;

[0059] 4. Support rod assembly; 41. Support rod; 42. Support connector;

[0060] 5. Locking structure; 51. Button; 52. Locking tooth; 53. Spring; 54. Locking shell; 55. Locking seat; 56. First tooth groove; 57. Second tooth groove.

[0061] 6. Connecting piece;

[0062] 7. Fence;

[0063] 8. Wheels;

[0064] A. First rotation point, B. Second rotation point, C. Third rotation point, D. Fourth rotation point, E. Fifth rotation point, F. Sixth rotation point, G. Seventh rotation point. Detailed Implementation

[0065] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0066] The specific embodiments of this utility model are described in detail below with reference to the foldable frame of the first aspect of this utility model and the trolley of the second aspect of this utility model.

[0067] According to an embodiment of the present invention, in a first aspect, a foldable frame is provided, combined with... Figures 1 to 12 As shown, the assembly includes a first connecting rod group 1, a second connecting rod group 2, a third connecting rod group 3, and a support rod group 4. A rotating part is provided between the first connecting rod group 1 and the second connecting rod group 2. The rotating part has a first state in which the first connecting rod group 1 rotates independently relative to the second connecting rod group 2, and a second state in which the first connecting rod group 1 and the second connecting rod group 2 move synchronously. The third connecting rod group 3 is hinged to the second connecting rod group 2. One end of the support rod group 4 is connected to the first connecting rod group 1 via a locking structure 5, and the other end of the support rod group 4 is hinged to the third connecting rod group 3. The locking structure 5 has an unlocked state and a locked state.

[0068] The specific working principle of the aforementioned foldable frame is as follows: When the locking structure 5 is in the unlocked state, the rotating part is in the first state, and the first connecting rod group 1 can rotate independently relative to the second connecting rod group 2. The user pushes the first connecting rod group 1, causing it to rotate around the locking structure 5 toward the third connecting rod group 3. When the first connecting rod group 1 rotates to the second state of the rotating part, the rotating part switches to the second state, causing the first connecting rod group 1 and the second connecting rod group 2 to move synchronously. The first connecting rod group 1 drives the second connecting rod group 2 to rotate around the hinge position between the second connecting rod group 2 and the third connecting rod group 3, and the second connecting rod group 2 rotates toward the third connecting rod group 3, ultimately realizing the folding of the entire foldable frame. Figure 4 As shown.

[0069] When the locking structure 5 is in the locked state, the positions of the first connecting rod group 1, the second connecting rod group 2, the third connecting rod group 3, and the support rod group 4 are relatively fixed, forming a stable operating state. Figure 1 and Figure 2 As shown.

[0070] The aforementioned foldable frame, through the design of the rotating part and locking structure 5, allows the user to easily fold the entire frame by simply unlocking the locking structure 5 and then pushing the first connecting rod group 1. This greatly simplifies the folding process and improves the user experience. Similarly, when it is necessary to unfold the frame, simply unlock the locking structure 5 and then reverse the operation to quickly restore it to its usable state.

[0071] In the locked state, the positions of the first connecting rod group 1, the second connecting rod group 2, the third connecting rod group 3, and the support rod group 4 are relatively fixed, forming a stable structure that ensures the safety of the trolley during use. The second state of the rotating part allows the first connecting rod group 1 and the second connecting rod group 2 to move synchronously, enabling the first connecting rod group, the second connecting rod group, and the third connecting rod group to fold synchronously, which is very convenient.

[0072] The rack can be quickly folded into a compact shape using a linkage folding mechanism. It is lightweight, making it easy to carry and store. The folded size is significantly reduced, making it suitable for storage in various settings such as homes and vehicles. The rack can also stand upright when folded.

[0073] In some embodiments, combined with Figures 6 to 10 As shown, the rotating part includes a first rotating part 11 and a second rotating part 23. The first rotating part 11 is disposed at the bottom end of the first connecting rod assembly 1. The second rotating part 23 is disposed at the top end of the second connecting rod assembly 2, and the second rotating part 23 cooperates with the first rotating part 11.

[0074] More specifically, the first rotating part 11 includes a first rotating part body 111 and a first protrusion 112. At least one first arc-shaped slide 113 is provided on the first rotating part body 111. At least one first protrusion 112 is provided, which is disposed on the first rotating part body 111 and located at the bottom starting end of the first arc-shaped slide 113.

[0075] The second rotating part 23 includes a second rotating part body 231 and a second protrusion 232. The second rotating part body 231 is rotatably connected to the first rotating part body 111, and at least one second arc-shaped slide 233 is provided on the second rotating part body 231. At least one second protrusion 232 is provided, which is disposed on the second rotating part body 231 and located at the top end of the second arc-shaped slide 233.

[0076] The first protrusion 112 is slidably fitted into the second arc-shaped slide rail 233, and the second protrusion 232 is slidably fitted into the first arc-shaped slide rail 113. The first protrusion 112 slides within the second arc-shaped slide rail 233, and the second protrusion 232 slides within the first arc-shaped slide rail 113, ensuring that the relative rotational movement of the first rotating part 11 and the second rotating part 23 is within a predetermined trajectory, avoiding unnecessary deviation or jamming.

[0077] When the first rotating part body 111 has an upward rotational tendency relative to the second rotating part body 231, the first protrusion 112 is limited by the second arc-shaped slide 233, and the second protrusion 232 is limited by the first arc-shaped slide 113.

[0078] When the first rotating part body 111 has a downward rotational tendency relative to the second rotating part body 231, the first protrusion 112 slides upward along the second arc-shaped slide 233, and the first arc-shaped slide 113 slides upward along the second protrusion 232.

[0079] In this embodiment, because both the first protrusion 112 and the second protrusion 232 are limited when rotating upwards, the first connecting rod assembly 1 cannot rotate upwards and can only rotate downwards. This effectively prevents the user from accidentally rotating the frame upwards during operation, avoiding unnecessary malfunctions or damage. When folding the foldable frame, the user only needs to push the first connecting rod assembly 1 downwards to fold the frame; the operation direction is clear and simple.

[0080] In some embodiments, the first state of the rotating part is the entire state in which the first protrusion 112 slides from the bottom starting end of the second arc-shaped slide 233 to the top ending end of the second arc-shaped slide 233. Therefore, when the rotating part is in the first state, the first rotating part body 111 can rotate relative to the second rotating part body 231. When the first protrusion 112 is at the bottom starting end of the second arc-shaped slide 233, the first connecting rod group 1 and the second connecting rod group 2 are arranged coaxially. As the first protrusion 112 slides upward along the second arc-shaped slide 233, the included angle between the first connecting rod group 1 and the second connecting rod group 2 gradually decreases.

[0081] The second state of the rotating part is when the first protrusion 112 abuts against the top end of the second arc-shaped slide 233 and the second protrusion 232 abuts against the bottom beginning of the first arc-shaped slide 113. In this state, the first rotating part 11 and the second rotating part 23 are in the fully retracted position, and the angle between the first connecting rod group 1 and the second connecting rod group 2 is at its minimum. At this time, if the first connecting rod group 1 is rotated downward, the first connecting rod group 1 and the second connecting rod group 2 will be linked. The first connecting rod group 1 will drive the second connecting rod group 2 to rotate around the hinge position between the second connecting rod group 2 and the third connecting rod group 3, thereby causing the second connecting rod group 2 to fold towards the third connecting rod group 3. The user can switch the frame from the fully extended state to the fully retracted state with a simple action (unlocking the locking structure 5 and pushing the first connecting rod group 1 downward), which is convenient and quick to operate.

[0082] In some embodiments, a rotating shaft 114 is provided on the first rotating part body 111, and a positioning hole 234 is provided on the second rotating part body 231, with the rotating shaft 114 rotatably disposed in the positioning hole 234.

[0083] In some embodiments, the first connecting rod assembly 1 includes a push handle 12, which has a first push handle member and a second push handle member, with a gap between the first push handle member and the second push handle member.

[0084] The second connecting rod assembly 2 includes two second connecting rods 21 spaced apart, and rotating parts are respectively provided between the first push handle rod and one of the second connecting rods and between the second push handle rod and the other second connecting rod.

[0085] The third connecting rod group 3 includes two third connecting rods 31 spaced apart, with the top end of each third connecting rod 31 hinged to the middle of the second connecting rod 21.

[0086] The support rod assembly 4 includes two support rods 41 spaced apart. One end of the support rod 41 is connected to a support connector 42 and is connected to the first connecting rod assembly 1 through a locking structure 5. The other end of the support rod 41 is hinged to the third connecting rod 31.

[0087] A first reinforcing rod 24 is provided between the two second connecting rods 21. A second reinforcing rod 32 is provided between the two third connecting rods 31. The first reinforcing rod 24 and the second reinforcing rod 32 can strengthen the connection and ensure the overall stability of the foldable frame.

[0088] In some embodiments, a fence 7 is hinged between two support rods 41, and a connecting piece 6 is provided between the fence 7 and the third connecting rod 31. The top end of the connecting piece 6 is hinged to the fence 7, and the bottom end of the connecting piece 6 is hinged to the third connecting rod 31. When the locking structure 5 is locked, the fence 7 is stably supported by the two connecting pieces 6, ensuring the stability of structures such as seats when they are installed on the fence 7. When the locking structure 5 is unlocked, the fence 7 can rotate to achieve the folding of the fence 7.

[0089] In some embodiments, the enclosure 7 is equipped with a seat and / or a cover, thus the foldable frame can be used as both a stroller and a pet stroller, increasing its versatility. When a seat is installed on the enclosure 7, it can be used to support an infant or other items requiring a sitting position. A cover can be installed on the enclosure 7 to provide sunshade, wind protection, rain protection, and other protective functions. When a seat is installed on the enclosure 7, the foldable frame can be used as a stroller, making it convenient for parents to push their infants out. When a cover is installed on the enclosure 7, the foldable frame can be used as a pet stroller, protecting pets from the external environment. Users can choose whether to install a seat and / or a cover according to their actual needs, flexibly adjusting the functionality of the frame.

[0090] In some embodiments, combined with Figure 11 and Figure 12 As shown, the locking structure 5 includes a locking seat 55, a button 51, a locking tooth 52, a spring 53, and a locking shell 54. The locking seat 55 is fixedly mounted on the first connecting rod assembly 1 and has multiple first toothed grooves 56. The locking shell 54 has correspondingly multiple second toothed grooves 57. The locking shell 54 is rotatably mounted on the locking seat 55. The button is assembled into the cavity of the locking shell 54. The locking tooth 52 is disposed within the cavities of the locking seat 55 and the locking shell 54, with one end of the locking tooth 52 abutting against the inner wall of the locking seat 55 via the spring 53. When the button 51 is not pressed, the locking tooth 52 is pressed into the second toothed groove 57 of the locking shell 54 by the spring, and part of the locking tooth 52 is located within the first toothed groove 56 of the locking seat 55. At this time, the locking shell 54 cannot rotate relative to the locking seat 55. When button 51 is pressed, locking tooth 52 fully enters the first tooth groove 56 of locking seat 55. At this time, locking shell 54 is no longer limited by locking tooth 52, and locking shell 54 can rotate relative to locking seat 55.

[0091] According to an embodiment of the present invention, in a second aspect, a trolley is provided, including a foldable frame and wheels 8. Multiple wheels 8 are provided, with wheels 8 respectively disposed at the bottom of the second connecting rod group 2 and the third connecting rod group 3 of the foldable frame. The second connecting rod group 2 and its wheels form a front leg group, and the third connecting rod group 3 and its wheels form a rear leg group.

[0092] Combination Figure 3 As shown, the hinge position between the first connecting rod group 1 and the support rod group 4 is the first rotation point A; the hinge position between the first connecting rod group 1 and the second connecting rod 21 is the second rotation point B; the hinge position between the second connecting rod 21 and the third connecting rod 31 is the third rotation point C; the hinge position between the support rod group 4 and the third connecting rod 31 is the fourth rotation point D; the hinge position between the fence 7 and the connecting piece 6 is the fifth rotation point E; the hinge position between the connecting piece 6 and the third connecting rod 31 is the sixth rotation point F; and the hinge position between the fence 7 and the support rod group 4 is the seventh rotation point G.

[0093] The specific working principle of the trolley is as follows: Pressing buttons 51 on both sides simultaneously pushes the locking teeth 52 from the locking housing 54 into the locking seat 55, thus unlocking the locking teeth 52 from the support rod assembly. Then, pressing the first connecting rod assembly 1 downwards causes it to rotate around the first rotation point A and move towards the support rod assembly. Simultaneously, through the second rotation point B, it drives the front leg assembly to rotate around the third rotation point C and move towards the rear leg assembly. The support rod assembly moves around the fourth rotation point D and towards the rear leg assembly. Simultaneously, it causes the fence 7 to rotate around the seventh rotation point G. The support rod assembly, through the fifth rotation point E, drives the connecting piece to rotate and retract. The unfolding process is similar.

[0094] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A foldable frame, characterized in that, include: First connecting rod group (1); The second connecting rod group (2) has a rotating part between the first connecting rod group (1) and the second connecting rod group (2). The rotating part has a first state in which the first connecting rod group (1) rotates independently relative to the second connecting rod group (2) and a second state in which the first connecting rod group (1) and the second connecting rod group (2) move synchronously together. The third connecting rod group (3) is hinged to the second connecting rod group (2); A support rod assembly (4), one end of which is connected to a first connecting rod assembly (1) via a locking structure (5), and the other end of which is hinged to a third connecting rod assembly (3). The locking structure (5) has an unlocked state and a locked state. When the locking structure (5) is in the unlocked state, the rotating part is in the first state, and the first connecting rod group (1) rotates around the locking structure (5) toward the third connecting rod group (3). When the first connecting rod group (1) rotates to the second state of the rotating part, the first connecting rod group (1) drives the second connecting rod group (2) to rotate toward the third connecting rod group (3) so that the foldable frame can be folded up. When the locking structure (5) is in the locked state, the positions of the first connecting rod group (1), the second connecting rod group (2), the third connecting rod group (3) and the support rod group (4) are relatively fixed.

2. The foldable frame according to claim 1, characterized in that, The rotating part includes: The first rotating part (11) is disposed at the bottom end of the first connecting rod assembly (1); The second rotating part (23) is disposed at the top of the second connecting rod assembly (2) and cooperates with the first rotating part (11).

3. The foldable frame according to claim 2, characterized in that, The first rotating part (11) includes: The first rotating part body (111) is provided with at least one first arc-shaped slide (113); At least one first protrusion (112) is disposed on the first rotating part body (111) and located at the bottom starting end of the first arc-shaped slide (113).

4. The foldable frame according to claim 3, characterized in that, The second rotating part (23) includes: The second rotating part body (231) is rotatably connected to the first rotating part body (111), and at least one second arc-shaped slide (233) is provided on the second rotating part body (231). At least one second protrusion (232) is disposed on the second rotating part body (231) and located at the top end of the second arc-shaped slide (233); The first protrusion (112) is slidably fitted into the second arc-shaped slide (233), and the second protrusion (232) is slidably fitted into the first arc-shaped slide (113); When the first rotating part body (111) has an upward rotational tendency relative to the second rotating part body (231), the first protrusion (112) is limited by the second arc-shaped slide (233), and the second protrusion (232) is limited by the first arc-shaped slide (113); When the first rotating part body (111) has a downward rotational tendency relative to the second rotating part body (231), the first protrusion (112) slides upward along the second arc-shaped slide (233), and the first arc-shaped slide (113) slides upward along the second protrusion (232).

5. The foldable frame according to claim 4, characterized in that, The first state of the rotating part is the entire state when the first protrusion (112) slides from the bottom starting end of the second arc-shaped slide (233) to the top ending end of the second arc-shaped slide (233); The second state of the rotating part is the state in which the first protrusion (112) abuts against the top end of the second arc-shaped slide (233) and the second protrusion (232) abuts against the bottom start of the first arc-shaped slide (113).

6. The foldable frame according to claim 4, characterized in that, The first rotating part body (111) is provided with a rotating shaft (114), and the second rotating part body (231) is provided with a positioning hole (234). The rotating shaft (114) is rotatably disposed in the positioning hole (234).

7. The foldable frame according to any one of claims 1-6, characterized in that, The first connecting rod assembly (1) includes a push handle (12), the push handle (12) having a first push handle member and a second push handle member, and a gap between the first push handle member and the second push handle member; The second connecting rod assembly (2) includes two second connecting rods (21) spaced apart. The rotating part is provided between the first push handle and one of the second connecting rods and between the second push handle and the other second connecting rod. A first reinforcing rod (24) is provided between the two second connecting rods (21). The third connecting rod group (3) includes two third connecting rods (31) spaced apart, with the top end of each third connecting rod (31) hinged to the middle of the second connecting rod (21); a second reinforcing rod (32) is provided between the two third connecting rods (31); The support rod assembly (4) includes two support rods (41) spaced apart. One end of the support rod (41) is connected to a support connector (42) and is connected to the first connecting rod assembly (1) via a locking structure (5). The other end of the support rod (41) is hinged to the third connecting rod (31).

8. The foldable frame according to claim 7, characterized in that, A fence (7) is hinged between the two support rods (41), and a connecting piece (6) is provided between the fence (7) and the third connecting rod (31). The top end of the connecting piece (6) is hinged to the fence (7), and the bottom end of the connecting piece (6) is hinged to the third connecting rod (31).

9. The foldable frame according to claim 8, characterized in that, Seats and / or covers are provided on the fence (7).

10. A trolley, characterized in that, include: The foldable frame according to any one of claims 1-9; Multiple wheels (8) are provided at the bottom of the second connecting rod group (2) and the third connecting rod group (3) of the foldable frame.

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