A foldable stroller

Abstract

The utility model provides a kind of foldable cart, it is related to the technical field of folding bicycle.The foldable cart includes support assembly, first connecting assembly and first elastic piece, support assembly includes at least two pairs of telescopic pieces, at least two pairs of telescopic pieces are oppositely arranged and are interconnected, first connecting assembly is connected between the two telescopic pieces of each pair, first connecting assembly can drive telescopic piece to lengthen or contract, so that foldable cart is in the state of folding and stretching, two ends of first elastic piece are connected with first connecting assembly respectively, first elastic piece is used to be in the state of stretching under folding, and elastic recovery force is generated in the process of conversion from folding to stretching and acts on first connecting assembly, so as to realize the convenient conversion from folding to unfolding, improve the usability and market adaptability of product.

Description

Technical Field

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

[0002] Trolleys are a common carrying tool, widely used in shopping, travel, logistics, and household life. To facilitate storage and portability, most trolleys are designed with a foldable structure, allowing them to be folded up to reduce their size after use.

[0003] However, conventional strollers typically require manual effort to pull the side frames, support rods, or wheel frames outwards during the transition from a folded to an unfolded state. This process is quite strenuous, especially for the elderly, children, or users with weaker physical strength, causing inconvenience. Utility Model Content

[0004] The purpose of this invention is to provide a foldable trolley that is easy to operate and unfolds smoothly. By optimizing the transmission and assist structure, it achieves a convenient transition from folding to unfolding, thereby improving the product's ease of use and market adaptability.

[0005] The embodiments of this utility model are implemented as follows: In a first aspect, this utility model provides a foldable trolley, comprising: A support assembly, the support assembly comprising at least two pairs of telescopic members, the at least two pairs of telescopic members being arranged opposite to each other and connected to each other; A first connecting component is connected between the two telescopic members in each pair. The first connecting component can drive the telescopic members to extend or retract, so that the foldable trolley is in a folded state and an extended state. A first elastic element has its two ends connected to the first connecting component. The first elastic element is used to be stretched in the closed state and to generate an elastic restoring force and act on the first connecting component during the process of changing from the closed state to the stretched state.

[0006] In an optional embodiment, the telescopic component includes a first tube and a second tube, the top end of the first tube is connected to the top end of the first connecting component, the bottom end of the second tube is connected to the bottom end of the first connecting component, and the first tube and the second tube are slidably connected. The first elastic element is disposed in the first tube and the second tube, with one end connected to the top end of the first tube and the other end connected to the bottom end of the second tube.

[0007] In an optional embodiment, the support assembly further includes a fixing member connected to the top end of the first tube body, and the first elastic member connected to the fixing member; And / or, the support assembly further includes a second elastic element disposed at the bottom end of the second tube, and the first elastic element is connected to the second elastic element.

[0008] In an optional embodiment, the second elastic element is a retaining ring.

[0009] In an optional embodiment, the first tube is slidably fitted inside the second tube; Alternatively, the first tube may be slidably fitted onto the second tube.

[0010] In an optional embodiment, the first connecting component includes a plurality of first connectors, two first connectors being paired and arranged crosswise, at least one pair of first connectors being disposed between two telescopic members, and the bottom and top ends of the telescopic members being connected to the ends of the paired and crosswise first connectors located on the same side.

[0011] In an optional embodiment, the number of the first connectors is multiple pairs, and the multiple pairs of the first connectors are connected sequentially and disposed between the two telescopic members of the support assembly.

[0012] In an optional embodiment, the support assembly further includes an upper connector and a lower connector, with both ends of the telescopic member connected to the upper connector and the lower connector respectively, and the top ends of the two first connectors that are paired and intersecting are connected to the upper connector and the bottom ends are connected to the lower connector. The two ends of the first elastic element are respectively connected to the upper connecting element and the lower connecting element.

[0013] In an optional embodiment, the first connecting component further includes an upper adapter and a lower adapter, wherein the top ends of two adjacent pairs of the first connecting components are connected through the upper adapter and the bottom ends are connected through the lower adapter. The two ends of the first elastic element are respectively connected to the upper adapter and the lower adapter.

[0014] In an optional embodiment, the first elastic element is a tendon, elastic rope, elastic rubber band, or elastic rubber strip.

[0015] The beneficial effects of the foldable trolley provided by this embodiment of the invention include: by directly integrating the first elastic element between the motion nodes of the first connecting component, utilizing the elastic potential energy stored in the first elastic element in the folded state, and releasing energy to assist during the unfolding process, the effort-saving and smoothness of the trolley's opening action is significantly improved. This structure requires no additional complex mechanical parts or external energy input; it effectively reduces the user's operational burden simply by rationally arranging the connection relationship between the elastic element and the existing linkage mechanism, and has the technical advantages of simple structure, sensitive response, and high reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first embodiment of the foldable trolley provided by this utility model. Figure 2 This is a schematic diagram of the second embodiment of the foldable trolley provided in this utility model.

[0018] Icons: 10 - Foldable trolley; 100 - Rollers; 200 - Support assembly; 210 - Telescopic component; 211 - First tube; 212 - Second tube; 220 - Fixing component; 230 - Second elastic component; 240 - Upper connector; 250 - Lower connector; 300 - First connecting assembly; 310 - First connector; 320 - Upper adapter; 330 - Lower adapter; 400 - Second connecting assembly; 410 - Second connector; 420 - Third connector; 500 - First elastic component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Trolleys are a common carrying tool, widely used in shopping, travel, logistics, and household life. To facilitate storage and portability, most trolleys are designed with a foldable structure, allowing them to be folded up to reduce their size after use.

[0026] However, conventional strollers typically require manual effort to pull the side frames, support rods, or wheel frames outwards during the transition from a folded to an unfolded state. This process is quite strenuous, especially for the elderly, children, or users with weaker physical strength, causing inconvenience.

[0027] Meanwhile, the laborious deployment method limits the application of the trolley in emergency or rapid deployment scenarios. Although some existing products attempt to introduce elastic elements to assist deployment, they are often structurally complex, have poor reliability, or pose a safety hazard of sudden popping open.

[0028] Therefore, there is an urgent need to provide a trolley structure that is easy to operate and unfolds smoothly. By optimizing the transmission and power assist mechanism, a convenient transition from folding to unfolding can be achieved, thereby improving the product's ease of use and market adaptability.

[0029] Please see Figure 1 and Figure 2 This utility model embodiment provides a foldable trolley 10, including rollers 100, support components 200, a first connecting component 300, a second connecting component 400, and a first elastic element 500.

[0030] In detail, in this embodiment, the support component 200 includes at least two pairs of telescopic members 210 arranged opposite each other to form the basic load-bearing frame of the trolley. Each pair of telescopic members 210 consists of two telescopic members 210 arranged at intervals, and the bottom end of each telescopic member 210 is connected to the roller 100, thereby providing a basis for the movement of the trolley.

[0031] The first connecting component 300 is connected between the two telescopic members 210 of each pair. The first connecting component 300 can drive the telescopic members 210 to extend or retract, so that the foldable trolley 10 is in a folded state and an extended state.

[0032] The two ends of the first elastic member 500 are respectively connected to the first connecting component 300. The first elastic member 500 is used to be in a stretched state in the retracted state, and to generate an elastic restoring force and act on the first connecting component 300 during the process of changing from the retracted state to the stretched state.

[0033] Furthermore, the first connecting assembly 300 includes a plurality of first connecting members 310, wherein two pairs of first connecting members 310 arranged in a cross configuration are configured between two telescopic members 210 of the same support assembly 200, and the top and bottom ends of the telescopic members 210 are respectively connected to the ends of the pair of cross first connecting members 310 located on the same side, thereby forming a typical scissor linkage mechanism.

[0034] When the trolley is in the folded state, the telescopic member 210 extends relative to each other along the axial direction, the included angle between the intersecting first connecting members 310 increases, and the overall structure is compact; while during the unfolding process, the telescopic member 210 shortens in the opposite direction, the intersecting first connecting members 310 rotate around their hinge point, the included angle gradually increases, thereby causing the trolley frame to expand outward.

[0035] Specifically, the two ends of the first elastic element 500 are respectively connected to the ends of two paired and intersecting first connecting elements 310 located on the same side. Therefore, during the trolley folding process, the first elastic element 500 is stretched to a taut state, storing elastic potential energy. When the external force is released or the unfolding action begins, the first elastic element 500 generates a contraction force due to its own rebound tendency. This force is transmitted to the first connecting element 310 through the connection point and further drives the telescopic element 210 to move in the unfolding direction. This design makes the first elastic element 500 not only exist as a structural connecting element, but also functionally transform into an unfolding assistance device, effectively reducing the force required for the user to manually open the trolley.

[0036] Based on the above design, the first elastic element 500 and the scissor-type first connecting assembly 300 form a mechanical feedback path, providing initial driving force at the beginning of the structure's deployment, thus avoiding the "difficulty in starting" phenomenon caused by the high static friction of traditional trolleys. Simultaneously, since the force of the first elastic element 500 decreases with the degree of deformation, its output force gradually weakens during the deployment stroke, perfectly matching the torque variation requirements of the scissor mechanism at different opening and closing angles, thereby achieving a smooth and controllable deployment process.

[0037] Therefore, this embodiment, by directly integrating the first elastic element 500 between the motion nodes of the scissor-type first connecting assembly 300, utilizes the elastic potential energy stored in its retracted state to release assistance during the unfolding process, significantly improving the effort-saving and smoothness of the trolley opening action. This structure requires no additional complex mechanical components or external energy input; it effectively reduces the user's operational burden simply by rationally arranging the connection relationship between the elastic element and the existing linkage mechanism, possessing technical advantages of simple structure, sensitive response, and high reliability.

[0038] It should be noted that the first elastic element 500 is a type of reinforcing bar. As a flexible polymer composite material, reinforcing bar has a regularly interwoven internal fiber structure, which can produce significant axial elongation when under tension, and its stress-strain curve exhibits nonlinear characteristics, meaning that the resistance is small in the initial stage and the load-bearing capacity gradually increases with the increase of the stretching amount. When the trolley is in the retracted state, the reinforcing bar is stretched to a predetermined length by the connecting nodes at both ends, storing elastic potential energy; when the external force is released, the reinforcing bar quickly retracts due to its inherent contraction tendency, converting the stored energy into mechanical kinetic energy, driving the cross first connecting member 310 in the first connecting assembly 300 to rotate around the hinge point, thereby causing the entire support assembly 200 to unfold outward.

[0039] This design allows the tendon not only to function as a connecting element but also to play a dual role in energy storage and release. Due to its soft texture and light weight, its installation inside the stroller frame does not add significant burden and poses no risk of rigid interference to moving parts. Furthermore, the tendon surface is typically treated with anti-slip and UV-resistant materials, ensuring stable mechanical properties under varying temperatures and humidity levels, preventing assistive device failure due to hardening at low temperatures or loosening at high temperatures.

[0040] It is understandable that the first elastic element 500 can also be an elastic rope, elastic rubber band or elastic rubber strip, etc., as long as it has elastic properties, and no specific limitation is made here.

[0041] Furthermore, the telescopic member 210 includes a first tube 211 and a second tube 212. The top end of the first tube 211 is connected to the top ends of two pairs of first connecting members 310 that are crossed, and the bottom end of the second tube 212 is connected to the bottom ends of two pairs of first connecting members 310 that are crossed. The first tube 211 and the second tube 212 are slidably connected, that is, the first tube 211 and the second tube 212 can slide axially in their height direction. A first elastic member 500 is disposed inside the first tube 211 and the second tube 212, and one end of the first elastic member 500 is connected to the top end of the first tube 211, and the other end is connected to the bottom end of the second tube 212.

[0042] Specifically, when the trolley transitions from a folded to an unfolded state, the first connecting member 310 rotates around its cross hinge point, causing relative sliding along the axial direction between the first tube 211 and the second tube 212. During this process, the first elastic member 500 is disposed within the first tube 211 and the second tube 212, with one end connected to the top of the first tube 211 and the other end connected to the bottom of the second tube 212. Since the first elastic member 500 is arranged within the internal space of the telescopic member 210, and its axial direction is consistent with the sliding direction of the telescopic member 210, it can be stretched and store elastic potential energy when the telescopic member 210 is compressed. When the externally applied folding force is released, the first elastic member 500 generates a contraction force due to its own rebound tendency. This force acts through the connection point on the top of the first tube 211 and the bottom of the second tube 212, thereby pushing the two tubes to slide relative to each other along the unfolding direction.

[0043] This design ensures that the first elastic element 500 not only functions as an energy storage component in the trolley's opening action, but also enjoys excellent structural protection due to its location within the telescopic element 210, avoiding the problems of external elastic elements being susceptible to wear, scratches, or external interference. Furthermore, fixing one end of the first elastic element 500 to the top of the first tube 211 and the other end to the bottom of the second tube 212 means that its effective working length is directly related to the overall telescopic stroke of the telescopic element 210, providing a continuous, progressive restoring force throughout the entire opening and closing range, thus effectively assisting the user in completing the unfolding operation.

[0044] Furthermore, the support assembly 200 also includes a fastener 220, which is connected to the top end of the first tube 211, and the first elastic member 500 is connected to the fastener 220.

[0045] In this embodiment, the first tube 211 serves as the outer or upper section of the telescopic member 210, with its top end forming the hinge node between the support assembly 200 and the first connecting assembly 300. This location bears significant structural stress and provides motion guidance during the trolley's deployment. A fixing member 220 is positioned at the top of the first tube 211, establishing a connection with the first elastic member 500, thus reliably limiting the upper end of the first elastic member 500 in the axial direction. This design not only avoids the loosening, slippage, or stress concentration problems that might occur if the first elastic member 500 is directly bound or inserted into the tube itself, but also enhances the structural strength and assembly convenience of the connection point through the independently provided fixing member 220.

[0046] Furthermore, the support assembly 200 also includes a second elastic element 230, which is disposed at the bottom end of the second tube 212, and the other end of the first elastic element 500 is connected to the second elastic element 230.

[0047] The second elastic element 230 is disposed at the bottom end of the second tube 212, and a connection is established between it and the first elastic element 500, so that the lower end of the first elastic element 500 can maintain relative fixation while having a certain degree of adaptive deformation capability. This design not only achieves a reliable connection between the first elastic element 500 and the dynamically moving parts, but also absorbs some vibration and impact stress through the deformation characteristics of the second elastic element 230 itself, reducing the risk of fatigue fracture at the connection point due to frequent bending or friction.

[0048] Optionally, the second elastic element 230 is a retaining ring.

[0049] In this embodiment, the retaining ring is defined as a metal component with radial elastic tensioning function. Its material is typically spring steel, which possesses good fatigue strength and recovery performance. Because the trolley frequently undergoes opening and closing actions during use, the connection points are subjected to alternating tensile stress over a long period. Using ordinary fasteners would easily lead to loosening or breakage. The retaining ring itself has a certain elastic compensation capability, maintaining connection stability under vibration and impact loads, while absorbing some dynamic stress, reducing direct impact on the end of the first elastic element 500, and providing a buffering effect.

[0050] It is understood that in other embodiments of this utility model, the first elastic member 500 may also be directly connected to the top end of the first tube 211 and the bottom end of the second tube 212.

[0051] It is worth mentioning that the first tube 211 is slidably fitted inside the second tube 212.

[0052] Specifically, when the first tube 211 is slidably fitted inside the second tube 212, the second tube 212 acts as an outer tube providing guidance, while the first tube 211 acts as an inner tube sliding axially within it. This design ensures that the externally visible portion is primarily the second tube 212, effectively concealing the internal sliding interface, improving the overall cleanliness of the appearance, and reducing the possibility of dust and foreign objects entering the sliding gap, thereby improving the durability and operational smoothness of the moving parts. Simultaneously, this structure facilitates the complete containment of the first elastic element 500 within the second tube 212, further enabling the concealed arrangement of functional components and preventing external scratches or accidental interference.

[0053] In another implementation, the first tube 211 can also be slidably fitted over the second tube 212. In this case, the first tube 211 acts as an outer tube covering the outside of the second tube 212 and sliding along its surface. Although this reverse fitting method exposes part of the sliding contact surface, stable friction performance can be ensured through reasonable material selection and surface treatment processes.

[0054] It should be noted that there are multiple pairs of first connectors 310, and the multiple pairs of first connectors 310 are connected in sequence and disposed between the two telescopic members 210 of the support assembly 200.

[0055] Specifically, each pair of first connecting members 310 is arranged crosswise and connected by a hinge shaft, with its two ends connected to corresponding nodes on the two telescopic members 210, thus forming a basic four-bar linkage. When multiple such connecting pairs are arranged sequentially along the length of the telescopic members 210 and connected to each other, the segments of the entire support assembly 200 move synchronously during the opening and closing process, forming a coordinated unfolding and retraction trajectory.

[0056] Furthermore, the support assembly 200 also includes an upper connector 240 and a lower connector 250. The two ends of the telescopic member 210 are connected to the upper connector 240 and the lower connector 250 respectively. The top ends of the two paired and intersecting first connectors 310 are connected to the upper connector 240 and the bottom ends are connected to the lower connector 250.

[0057] like Figure 1 As shown, in some embodiments of this utility model, the two ends of the first elastic member 500 are respectively connected to the upper connecting member 240 and the lower connecting member 250.

[0058] Specifically, the upper connector 240 is located in the top region of the support assembly 200, serving as a convergence node for multiple structural elements and connecting the top ends of the two telescopic members 210 and the top ends of multiple pairs of first connectors 310. Correspondingly, the lower connector 250 is located in the bottom region, achieving a centralized connection between the bottom ends of the two telescopic members 210 and the bottom ends of multiple pairs of first connectors 310. This design makes the upper connector 240 and the lower connector 250 serve as fixed fulcrums or moving references for the scissor mechanism during axial movement, effectively constraining the spatial trajectory of each first connector 310 during rotation and preventing structural skewing or jamming due to loose hinges or asynchronous movement.

[0059] It should be noted that the top end of the first elastic element 500 is connected to the top end of the first tube 211 through the fixing member 220, and is connected to the upper connecting member 240 through the top end of the first tube 211, thereby realizing the indirect connection between the first elastic element 500 and the upper connecting member 240; similarly, the bottom end of the first elastic element 500 is connected to the bottom end of the second tube 212 through the second elastic element 230, and is connected to the lower connecting member 250 through the bottom end of the second tube 212, thereby realizing the indirect connection between the first elastic element 500 and the lower connecting member 250.

[0060] Furthermore, the first connecting component 300 also includes an upper adapter 320 and a lower adapter 330, with the top ends of two adjacent pairs of first connecting components 310 connected by the upper adapter 320 and the bottom ends connected by the lower adapter 330.

[0061] like Figure 2 As shown, in some other embodiments of this utility model, the two ends of the first elastic member 500 are connected to the upper adapter 320 and the lower adapter 330, respectively.

[0062] Specifically, each pair of first connectors 310 forms a scissor unit at the intersection via a hinge, and its top and bottom ends are connected to the top and bottom ends of the adjacent pair of first connectors 310 via an upper adapter 320 and a lower adapter 330, respectively.

[0063] In this embodiment, since the two ends of the first elastic element 500 are connected to the upper adapter 320 and the lower adapter 330 respectively, its stretching and contraction process directly responds to the change in the relative distance between these two adapters. When the trolley is retracted, the upper adapter 320 and the lower adapter 330 move away from each other, and the first elastic element 500 is stretched and stores elastic potential energy; when the external force is released, the first elastic element 500 generates a contraction force due to the rebound tendency, and this force is transmitted to the relevant first connecting members 310 through the upper adapter 320 and the lower adapter 330, thereby driving the entire scissor lift mechanism to automatically unfold.

[0064] It is worth mentioning that the first elastic element 500 can be set only between the upper connector 240 and the lower connector 250 at the telescopic member 210, or it can be set only between the upper adapter 320 and the lower adapter 330. Of course, it can also be set simultaneously between the upper connector 240 and the lower connector 250, and between the upper adapter 320 and the lower adapter 330.

[0065] Furthermore, the second connection assembly 400 includes a pair of second connectors 410 and a pair of third connectors 420.

[0066] Among them, the two pairs of second connectors 410 are also arranged in a cross manner, and the top and bottom ends of the two second connectors 410 on the same side are connected to the top and bottom ends of the support of one of the support components 200, and the top and bottom ends on the other side are connected to the top and bottom ends of the support of the adjacent support component 200.

[0067] The two pairs of third connectors 420 are also arranged in a cross configuration, with the two ends on one side of each third connector 420 connected to the bottom of the four supports of the two oppositely arranged support assemblies 200.

[0068] This design allows the two opposing support components 200 to be stably connected, thereby forming a stable frame structure for the vehicle body and improving the structural strength and stability of the foldable stroller 10.

[0069] In summary, this utility model provides a foldable trolley 10. By directly integrating the first elastic element 500 between the movement nodes of the scissor-type first connecting assembly 300, it utilizes the elastic potential energy stored in the folded state to release assistance during the unfolding process, significantly improving the effort-saving and smoothness of the trolley's opening action. This structure requires no additional complex mechanical parts or external energy input; it effectively reduces the user's operational burden simply by rationally arranging the connection relationship between the elastic element and the existing linkage mechanism. It has the technical advantages of simple structure, sensitive response, and high reliability.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A foldable trolley, characterized in that, include: A support assembly (200) includes at least two pairs of telescopic members (210), the at least two pairs of telescopic members (210) being arranged opposite to each other and interconnected; A first connecting component (300) is connected between the two telescopic members (210) of each pair. The first connecting component (300) can drive the telescopic members (210) to extend or retract so that the foldable trolley is in a folded state and an extended state. The first elastic element (500) has two ends connected to the first connecting component (300). The first elastic element (500) is used to be stretched in the closed state and to generate elastic restoring force and act on the first connecting component (300) during the process of changing from the closed state to the stretched state.

2. The foldable trolley according to claim 1, characterized in that, The telescopic component (210) includes a first tube (211) and a second tube (212). The top end of the first tube (211) is connected to the top end of the first connecting component (300), and the bottom end of the second tube (212) is connected to the bottom end of the first connecting component (300). The first tube (211) and the second tube (212) are slidably connected. The first elastic element (500) is disposed inside the first tube (211) and the second tube (212), with one end connected to the top end of the first tube (211) and the other end connected to the bottom end of the second tube (212).

3. The foldable trolley according to claim 2, characterized in that, The support assembly (200) further includes a fastener (220) connected to the top end of the first tube (211), and the first elastic member (500) connected to the fastener (220). And / or, the support assembly (200) further includes a second elastic element (230), which is disposed at the bottom end of the second tube (212), and the first elastic element (500) is connected to the second elastic element (230).

4. The foldable trolley according to claim 3, characterized in that, The second elastic element (230) is a snap ring.

5. The foldable trolley according to claim 2, characterized in that, The first tube (211) is slidably fitted inside the second tube (212); Alternatively, the first tube (211) may be slidably fitted over the second tube (212).

6. The foldable trolley according to claim 1, characterized in that, The first connecting component (300) includes a plurality of first connectors (310), two first connectors (310) are paired and arranged in a cross configuration, at least one pair of first connectors (310) is disposed between two telescopic members (210), and the bottom end and top end of the telescopic member (210) are respectively connected to the ends of the paired and cross first connectors (310) located on the same side.

7. The foldable trolley according to claim 6, characterized in that, The number of the first connectors (310) is multiple pairs, and the multiple pairs of the first connectors (310) are connected in sequence and disposed between the two telescopic members (210) of the support assembly (200).

8. The foldable trolley according to claim 7, characterized in that, The support assembly (200) further includes an upper connector (240) and a lower connector (250). The two ends of the telescopic member (210) are respectively connected to the upper connector (240) and the lower connector (250). The top ends of the two first connectors (310) that are paired and intersecting are connected to the upper connector (240) and the bottom ends are connected to the lower connector (250). The two ends of the first elastic member (500) are respectively connected to the upper connector (240) and the lower connector (250).

9. The foldable trolley according to claim 7 or 8, characterized in that, The first connecting component (300) further includes an upper adapter (320) and a lower adapter (330), with the top ends of two adjacent pairs of the first connecting components (310) connected by the upper adapter (320) and the bottom ends connected by the lower adapter (330); The two ends of the first elastic member (500) are respectively connected to the upper adapter (320) and the lower adapter (330).

10. The foldable trolley according to claim 1, characterized in that, The first elastic element (500) is a tendon, elastic rope, elastic rubber band or elastic rubber strip.

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