A type of handcart

Abstract

This utility model provides a handcart, including a frame comprising a first support assembly and a second support assembly; a linkage support structure connected between the first and second support assemblies; an elastic structure disposed on the first and / or second support assemblies to provide a force for automatic folding or unfolding of the frame; and a linkage structure disposed on the frame to drive the first and / or second support assemblies to rotate. Through the drive of the linkage structure, the first and / or second support assemblies, in cooperation with the elastic structure and the linkage support structure, achieve automatic folding or unfolding of the frame, improving convenience, safety, and comfort, making it particularly suitable for outdoor carrying, camping transport, or everyday item movement scenarios.

Description

Technical Field

[0001] This utility model relates to the field of trolley technology, and in particular to a handcart. Background Technology

[0002] There are many types of outdoor strollers in the current technology. Most of them have fixed structures for the armrests and leg tubes, which occupy a lot of space when not in use. In terms of folding, the current technology is relatively cumbersome and cannot be completed easily and quickly. In addition, it usually requires more than one user to operate, resulting in a poor user experience and a large size after being folded.

[0003] Chinese Patent Publication No. CN110356448B, published in October 2019, discloses a handcart, specifically comprising two side frames arranged side by side, and multiple support members connecting the two side frames. Each side frame includes a synchronous vertical rod and front and rear leg components distributed on both sides of the synchronous vertical rod. In the folded state, the front and rear leg components move closer to the synchronous vertical rod, and in the unfolded state, the front and rear leg components unfold accordingly. The support members include a first connector connecting the front leg components of the two side frames, and a second connector connecting the rear leg components of the two side frames. A locking mechanism is provided between the first and second connectors to restrict their relative position to maintain the unfolded state, and the locking mechanism also has an unlocking state that allows the first and second connectors to move closer to each other. Although the above patent can achieve folding or unfolding, the folding or unfolding action requires manual operation by the user and cannot achieve automatic folding or unfolding.

[0004] Therefore, further improvements are necessary. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a handcart that overcomes the shortcomings of the prior art. The cart frame can be quickly and automatically folded with one hand, making operation simple and convenient and improving the user's operating experience.

[0006] A handcart designed for this purpose includes The vehicle frame includes a first support assembly and a second support assembly; A linkage support structure is provided, which connects the first support assembly and the second support assembly. An elastic structure is disposed on the first support assembly and / or the second support assembly to provide a force for the automatic folding or unfolding of the frame; A linkage structure is provided on the vehicle frame to drive the first support assembly and / or the second support assembly to rotate; wherein, driven by the linkage structure, the first support assembly and / or the second support assembly cooperate with the elastic structure and the linkage support structure to realize the automatic folding or automatic unfolding of the vehicle frame.

[0007] The linkage structure is used to drive the first support assembly to rotate, and the second support assembly folds or unfolds synchronously with the first support assembly under the action of the linkage support structure; or... The linkage structure is used to drive the second support assembly to rotate, and the first support assembly folds or unfolds synchronously with the second support assembly under the action of the linkage support structure; or... The linkage structure connects the first support assembly and the second support assembly to achieve synchronous folding or unfolding of the vehicle frame.

[0008] The linkage support structure includes a support rod, which is connected between the first support assembly and the second support assembly to achieve synchronous linkage between the first support assembly and the second support assembly during the automatic folding or unfolding of the vehicle frame.

[0009] The linkage structure includes a first link and a link assembly. One end of the first link is hinged to the first support assembly or the second support assembly, and the other end of the first link is hinged to the link assembly.

[0010] The trolley also includes a drive unit, which is movably disposed and connected to the linkage structure. One end of the linkage assembly is hinged to the drive unit, and the other end of the linkage assembly is hinged to the first linkage. When the drive unit is triggered or driven, the linkage assembly and the first linkage rotate, thereby causing the first support assembly or the second support assembly to rotate.

[0011] The linkage assembly includes a second link and a third link that are hinged to each other. One end of the second link is hinged to the first link, and the third link is hinged to the drive member.

[0012] The linkage support structure further includes a first support, and the first support assembly includes a first base frame and a second base frame. One end of the first base frame and the second base frame are respectively hinged to the first support, and the first base frame and the second base frame are arranged opposite to each other.

[0013] The linkage support structure further includes a second support, and the second support assembly includes at least one pair of first tubes and second tubes, with one end of each pair of first tubes and second tubes hinged to the second support; the support rod is disposed between the first support and the second support.

[0014] The elastic structure is provided in one or more, and one or more of the elastic structures are provided between the first base frame and the second base frame; The first support assembly further includes a plurality of support columns, which are evenly spaced on the first base frame and the second base frame, and the two ends of the elastic structure are respectively hooked onto the support columns; The elastic structure is a spring or a torsion spring.

[0015] The trolley also includes a front support and a rear support that are spaced apart at the front and rear of the frame, with the other ends of the first support assembly and the second support assembly respectively hinged between the front support and the rear support.

[0016] Compared with the prior art, the handcart in the above embodiment includes a frame, which is composed of a first support assembly and a second support assembly. The two assemblies move in coordination through a linkage support structure. An elastic structure is provided on the support assembly to provide auxiliary force during folding or unfolding. A linkage structure is used to drive the support assembly to rotate, wherein the linkage structure can drive the first support assembly and / or the second support assembly. This enables the automatic and smooth folding and unfolding of the frame, improving convenience, safety and comfort. It is particularly suitable for outdoor carrying, camping transport or daily moving of items, and has good promotion and application value. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the handcart in one embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the handcart from another perspective in one embodiment of the present invention.

[0021] Figure 3 This is an exploded view of a handcart in one embodiment of the present invention.

[0022] Figure 4This is a schematic diagram of the unfolded handcart in one embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the handcart in the folding state in one embodiment of the present invention.

[0024] Figures 6-8 These are schematic diagrams showing the changes in the folding state of the handcart in one embodiment of this utility model.

[0025] Figure 9 This is a schematic diagram of the handcart in a folded state according to one embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] like Figures 1-9 As shown, a handcart is provided, including The vehicle frame 100 includes a first support assembly 1 and a second support assembly 2; Linkage support structure 3, which is connected between the first support assembly 1 and the second support assembly 2; Elastic structure 8 is disposed on the first support assembly 1 and / or the second support assembly 2, and is used to provide the force for automatic folding or unfolding of the frame 100. Linkage structure 4 is mounted on the frame 100 and is used to drive the first support assembly 1 and / or the second support assembly 2 to rotate. Through the drive of linkage structure 4, the first support assembly 1 and / or the second support assembly 2, in cooperation with elastic structure 8 and linkage support structure 3, realize the automatic folding or automatic unfolding of frame 100.

[0028] Specifically, when the linkage structure 4 is pushed or triggered to unlock, the linkage structure 4 transmits motion to the first support assembly 1 or the second support assembly 2, causing it to rotate. The linkage support structure 3 synchronously transmits this rotation to another support assembly, realizing the overall unfolding or folding of the frame. The elastic structure 8 provides assistance or self-resetting function during the process. If the driving component 5 drives the first support assembly 1, its rotation is transmitted to the second support assembly 2 through the linkage support structure 3, completing the overall unfolding or folding; if the driving component 5 is connected to the second support assembly 2, it can similarly drive its rotation and transmit it to the first support assembly 1 through the linkage support structure 3; if the linkage structure 4 connects the two support assemblies at the same time, the action of the driving component 5 can directly drive the two to unfold or fold synchronously.

[0029] It should be noted that the first support assembly 1 and the second support assembly 2 can rotate relative to each other. When the user triggers the drive component 5, the linkage assembly 42 drives the first linkage 201 to rotate, causing the first support assembly 1 to rotate around the hinge point. The elastic structure 8 is stretched or compressed during the folding process, and the stored elastic potential energy drives the first support assembly 1 to move in the opposite direction when it is released. The linkage support structure 3 transmits the movement of the first support assembly 1 to the second support assembly 2, ensuring that the two always maintain synchronous angle changes. In the unfolded state, the elastic structure 8 is in a stretched state.

[0030] It should be noted that the frame 100 is composed of a first support assembly 101 and a second support assembly 102, which are located on the left and right sides or front and rear sides of the frame 100 respectively. They can rotate relative to each other, and the frame 100 can be folded or unfolded synchronously through the linkage support structure 3, the elastic structure 8 and the linkage structure 4.

[0031] Furthermore, such as Figures 1-3 As shown, the linkage structure 4 is used to drive the first support assembly 1 to rotate, and the second support assembly 2 folds or unfolds synchronously with the first support assembly 1 under the action of the linkage support structure 3; or, Linkage structure 4 is used to drive the second support assembly 2 to rotate (not shown in the figure), and the first support assembly 1 folds or unfolds synchronously with the second support assembly 2 under the action of linkage support structure 3; or... The linkage structure 4 connects the first support assembly 1 and the second support assembly 2 (not shown in the figure) to achieve synchronous folding or unfolding of the frame 100.

[0032] Specifically, when the linkage structure 4 is driven, the first support assembly 1 or the second support assembly 2, as the active component, begins to rotate, and the linkage support structure 3 transmits the rotational motion to one of the support assemblies, so that it moves synchronously with the active component. For example, in one embodiment, a first link 201 is hinged at one end to a first bracket assembly 101; the other end of the first link 201 is hinged to a link assembly 42; the link assembly 42 includes a second link 421 and a third link 422 hinged to each other, one end of the second link 421 is hinged to the first link 41, and the third link 422 is hinged to the drive member 5; the second bracket assembly 102 is connected to the first bracket assembly 101 through a support rod 401 to form a linkage structure; the user pushes the drive member 301, causing the third link 422 to drive the second link 421 to rotate, thereby pushing the first link 41 from the unfolded direction to the folded state; at the same time, through the pulling or pushing force of the support rod 401, the first bracket assembly 101 will fold or unfold accordingly, realizing the linkage folding of the entire frame.

[0033] In another embodiment (not shown in the figure), one end of the first link 201 is hinged to the second bracket assembly 102, and the other end is connected to the link assembly 42; the first bracket assembly 101 is linked with the second bracket assembly 102 through the support rod 401; when the user pushes the drive member 301, the third link 203 pushes the second link 202, causing the first link 201 to rotate and drive the second bracket assembly 102 to fold or unfold. At the same time, through the pulling or pushing force of the support rod 401, the first bracket assembly 101 will fold or unfold accordingly, realizing the linkage folding or extension of the entire frame.

[0034] In another embodiment (not shown in the figure), one end of the first link 201 is forked and hinged to the rotating ends of the first support assembly 101 and the second support assembly 102, respectively. The link assembly 42 includes a second link 421 and a third link 422 that are hinged to each other. One end of the second link 421 is hinged to the first link 41, and the third link 422 is hinged to the drive member 5. When the user pushes the drive member 301, the third link 203 pushes the second link 202 downward. The second link 202 drives the first link 201 to generate a bidirectional pushing force through the central pivot point. The two ends of the first link 201 act on the first support assembly 101 and the second support assembly 102, respectively, so that the two rotate synchronously in opposite directions, thereby realizing the symmetrical folding or unfolding of the frame.

[0035] Furthermore, such as Figures 1-3 As shown, the linkage support structure 3 includes a support rod 31, which is connected between the first support assembly 1 and the second support assembly 2, and is used to realize the synchronous linkage between the first support assembly 1 and the second support assembly 2 during the automatic folding or unfolding of the frame 100.

[0036] Specifically, the two ends of the support rod 31 are respectively inserted into the first support 32 and the second support 33. When one of the support components rotates, the support rod 31, due to its own rigidity and angle limitation, forces the other support component to rotate in sync with the angular velocity.

[0037] Furthermore, such as Figures 1-3 As shown, the linkage structure 4 includes a first link 41 and a link assembly 42. One end of the first link 41 is hinged to the first support assembly 1 or the second support assembly 2, and the other end of the first link 41 is hinged to the link assembly 42.

[0038] Specifically, when an external force is applied to the linkage assembly 42, its hinge point is displaced, causing the first link 41 to rotate around the hinge axis of the first support assembly 1 or the second support assembly 2. It should be noted that both the first link 41 and the linkage assembly 42 are hinged via pins or movable connectors to ensure smooth switching between folded and unfolded states.

[0039] Furthermore, such as Figures 1-3 As shown, the handcart also includes a drive component 5, which is movably set and connected to the linkage structure 4. One end of the linkage assembly 42 is hinged to the drive component 5, and the other end of the linkage assembly 42 is hinged to the first linkage 41. When the drive component 5 is triggered or driven, the linkage assembly 42 and the first linkage 41 are rotated, so that the first support assembly 1 or the second support assembly 2 rotates.

[0040] Specifically, the driving component 5 is a mechanical part that can generate displacement or rotation, which can be implemented by means of a slider, a rotary handle, or a button. Its movable setting converts the external force input into the starting point of the mechanical transmission path. When the driving component 5 is triggered externally, its movement trajectory is transmitted to the linkage assembly 42 through the hinge point. The second link 421 and the third link 422 in the linkage assembly 42 form a revolute joint at the hinge point, decomposing the motion of the driving component 5 into multi-directional power output. The hinge point between the first link 41 and the second link 421 transmits power to the first support assembly 1 or the second support assembly 2, causing it to rotate around the fixed hinge point. It should be noted that the drive unit 5 can be located at the front end or side of the frame 100.

[0041] Furthermore, such as Figures 1-3 As shown, the linkage assembly 42 includes a second link 421 and a third link 422 that are hinged to each other. One end of the second link 421 is hinged to the first link 41, and the third link 422 is hinged to the drive member 5.

[0042] Specifically, the second link connects to the intermediate transmission component between the first link 41 and the third link 422. The second link 421 and the third link 422 are connected by a hinge or a pivot, specifically a pin, which allows the two links to rotate relative to each other during movement. When the drive member 5 is triggered, the third link 422 moves with the drive member 5 and is displaced. Power is transmitted to the second link 421 through the hinge point between the second link 421 and the third link 422, causing the connected first support assembly 1 or second support assembly 2 to fold or unfold.

[0043] Optionally, the length of each segment of the link assembly 42 can be adjusted according to the width of the frame to adapt to the drive path design of different vehicle models.

[0044] Furthermore, such as Figures 1-3 As shown, the linkage support structure 3 also includes a first support 32, and the first bracket assembly 1 includes a first base frame 11 and a second base frame 12. One end of the first base frame 11 and the second base frame 12 are respectively hinged to the first support 32, and the first base frame 11 and the second base frame 12 are arranged opposite to each other.

[0045] Specifically, the first support 32 serves as a connecting pivot, allowing the first base frame 11 and the second base frame 12 to rotate hingedly around the support. During folding or unfolding, the two base frames move relative to each other around the first support 32 as the center of rotation, thereby enabling the entire first support assembly 1 to achieve a stable opening and closing structure. Since the first base frame 11 and the second base frame 12 are arranged opposite each other, their movement trajectories unfold or close in a mirror manner, enhancing the symmetry and stability of the frame 100 during operation. In the unfolded state, a stable support plane can be formed, and the elastic force of the elastic structure 8 is evenly transmitted to the two base frames through the support column 13, causing them to maintain synchronous displacement during folding or unfolding.

[0046] Furthermore, such as Figures 1-3 As shown, the linkage support structure 3 also includes a second support 33, and the second support assembly 2 includes at least one pair of first tubes 21 and second tubes 22, with one end of each pair of first tubes 21 and second tubes 22 being hinged to the second support 33; the support rod 31 is disposed between the first support 32 and the second support 33.

[0047] Specifically, the second support 33 serves as the rotation pivot of the second support assembly 2, allowing the first tube 21 and the second tube 22 to rotate around the support, thereby enabling the folding and unfolding of the second support assembly 2.

[0048] The two ends of the support rod 31 are connected to the first support 32 and the second support 33 respectively. When either the first support assembly 1 or the second support assembly 2 is driven to rotate, the support rod 31 transmits the angular displacement of the support assembly to the other support assembly through the rod, so as to achieve synchronous movement.

[0049] It should be noted that the first tube 21 and the second tube 22 are arranged symmetrically in parallel and located on both sides of the frame 100 to form a stable frame for the second support assembly 2; the support rod 31 can be a rigid tie rod, a telescopic rod or a double folding rod to adapt to the stroke changes required for the folding movement.

[0050] During the folding process of the frame 100, when the first support assembly 1 rotates via the first support 32, the support rod 31 transmits the rotational power to the second support 33, forcing the second support 33 to undergo synchronous displacement. At this time, the paired first tube 21 and second tube 22 share the same hinge point of the second support 33, and their folding angles are forced to remain consistent, avoiding the rotational phase difference caused by independent hinges.

[0051] Furthermore, such as Figures 1-3 As shown, there is one or more elastic structures 8, and one or more elastic structures 8 are disposed between the first base frame 11 and the second base frame 12. The first support assembly 1 also includes a plurality of support columns 13, which are evenly spaced on the first base frame 11 and the second base frame 12, and the two ends of the elastic structure 8 are respectively attached to the support columns 13. The elastic structure 8 is a spring or torsion spring.

[0052] Specifically, the elastic structure 8 having one or more means that the number of elastic bodies can be configured to be two or more, which can be achieved by using springs or torsion springs arranged in parallel, forming a composite force through multi-point elastic support; When the folding action is triggered, the elastic structure 8 drives the first base frame 11 and the second base frame 12 to generate relative displacement through the stored elastic potential energy. Since the support columns 13 are symmetrically distributed on the two base frames, the tension or compression of each elastic body remains balanced, avoiding deformation of the support due to excessive force at a single point.

[0053] Furthermore, such as Figures 1-3 As shown, the handcart also includes a front support 6 and a rear support 7 that are spaced apart at the front and rear of the frame 100, and the other ends of the first support assembly 1 and the second support assembly 2 are respectively hinged between the front support 6 and the rear support 7.

[0054] Specifically, in the unfolded state of the trolley, one end of the first support assembly 1 and the second support assembly 2 are kept in synchronous extension through the linkage support structure 3, and the other end is connected to the front support 6 and the rear support 7 through the hinge points respectively, forming a four-point hinge support structure; when the drive component 5 is triggered, the linkage structure 4 pushes the first support assembly 1 or the second support assembly 2 to rotate, and the first support assembly 1 or the second support assembly 2 rotates around the hinge points of the front support 6 and the rear support 7, so as to realize the folding or unfolding of the entire vehicle frame.

[0055] Furthermore, the top and bottom of the front bracket 6 and the rear bracket 7 are provided with fixing seats for hinged connection of one end of the first bracket assembly 1 and the second assembly 2.

[0056] Furthermore, both the front bracket 6 and the rear bracket 7 are equipped with casters.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0062] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A trolley characterised by: include The frame (100) includes a first support assembly (1) and a second support assembly (2); Linkage support structure (3), which is connected between the first support assembly (1) and the second support assembly (2); An elastic structure (8) is disposed on the first support assembly (1) and / or the second support assembly (2) for providing a force for the automatic folding or unfolding of the frame (100); A linkage structure (4) is provided on the frame (100) for driving the first support assembly (1) and / or the second support assembly (2) to rotate; wherein, driven by the linkage structure (4), the first support assembly (1) and / or the second support assembly (2) cooperate with the elastic structure (8) and the linkage support structure (3) to realize the automatic folding or automatic unfolding of the frame (100).

2. The handcart according to claim 1, characterized in that: The linkage structure (4) is used to drive the first support assembly (1) to rotate, and the second support assembly (2) folds or unfolds synchronously with the first support assembly (1) under the action of the linkage support structure (3); or, The linkage structure (4) is used to drive the second support assembly (2) to rotate, and the first support assembly (1) folds or unfolds synchronously with the second support assembly (2) under the action of the linkage support structure (3); or, The linkage structure (4) connects the first bracket assembly (1) and the second bracket assembly (2) to achieve synchronous folding or unfolding of the frame (100).

3. The cart of claim 1, wherein: The linkage support structure (3) includes a support rod (31), which is connected between the first bracket assembly (1) and the second bracket assembly (2) to realize synchronous linkage between the first bracket assembly (1) and the second bracket assembly (2) during the automatic folding or unfolding of the frame (100).

4. The cart of claim 1, wherein: The linkage structure (4) includes a first link (41) and a link assembly (42). One end of the first link (41) is hinged to the first support assembly (1) or the second support assembly (2), and the other end of the first link (41) is hinged to the link assembly (42).

5. The cart of claim 4, wherein: The handcart also includes a drive unit (5), which is movably disposed and connected to the linkage structure (4). One end of the linkage assembly (42) is hinged to the drive unit (5), and the other end of the linkage assembly (42) is hinged to the first linkage (41). When the drive unit (5) is triggered or driven, the linkage assembly (42) and the first linkage (41) are rotated, so that the first support assembly (1) or the second support assembly (2) rotates.

6. The cart of claim 5, wherein: The linkage assembly (42) includes a second link (421) and a third link (422) that are hinged to each other. One end of the second link (421) is hinged to the first link (41), and the third link (422) is hinged to the drive member (5).

7. The cart of claim 3, wherein: The linkage support structure (3) further includes a first support (32). The first support assembly (1) includes a first base frame (11) and a second base frame (12). One end of the first base frame (11) and the second base frame (12) are respectively hinged to the first support (32), and the first base frame (11) and the second base frame (12) are arranged opposite to each other.

8. The cart of claim 7, wherein: The linkage support structure (3) further includes a second support (33). The second support assembly (2) includes at least one pair of first tubes (21) and second tubes (22). One end of the first tube (21) and the second tube (22) are respectively hinged to the second support (33). The support rod (31) is disposed between the first support (32) and the second support (33).

9. The cart of claim 7, wherein: There is one or more elastic structures (8), and one or more elastic structures (8) are disposed between the first base frame (11) and the second base frame (12); The first support assembly (1) further includes a plurality of support columns (13), which are evenly spaced on the first base frame (11) and the second base frame (12), and the two ends of the elastic structure (8) are respectively attached to the support columns (13); The elastic structure (8) is a spring or a torsion spring.

10. The cart of claim 1, wherein: The trolley also includes a front support (6) and a rear support (7) spaced apart at the front and rear of the frame (100), with the other ends of the first support assembly (1) and the second support assembly (2) respectively hinged between the front support (6) and the rear support (7).

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