A double-deck chassis folding trolley

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By employing a double-layer base design and a foldable structure, the problems of insufficient space and stability of handcarts are solved, enabling multi-level classified storage and efficient transportation, thus improving the user experience.

CN224491097UActive Publication Date: 2026-07-14ZHEJIANG PRIDE LEISURE PROD CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: ZHEJIANG PRIDE LEISURE PROD CO LTD
Filing Date: 2025-06-20
Publication Date: 2026-07-14

AI Technical Summary

Technical Problem

The existing handcarts have a single-layer structure with limited storage platform area, making it difficult to effectively transport items that are inconvenient to stack, and they also lack stability.

Method used

The design incorporates a double-layered base frame structure, forming a multi-layered structure with a base frame, intermediate frame, and top frame. Foldable connectors and folding components are used, along with limiting plates and track grooves, to achieve synchronous and coordinated folding of the frame, enhancing stability and space utilization.

Benefits of technology

It improves space utilization, enables multi-level classification and storage, enhances transportation efficiency and stability, takes up little space when folded, facilitates storage and transportation, and adapts to the needs of different items.

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Abstract

The utility model relates to a handcart technical field, and specifically relates to a double-layer chassis folding handcart, mainly including frame assembly, wheel assembly and multilayer folding frame body. Frame assembly constitutes frame structure by four vertical poles and multilayer cross bars, and is equipped with four wheels at the bottom. The foldable chassis assembly, middle frame assembly and top frame assembly are arranged between the front and rear cross bars, forming multilayer storage platforms. Each frame body realizes folding function through unique double-layer hinged structure - the connecting frame of left and right sides is composed of front frame and rear frame, and the both ends are hinged with vertical poles through connecting pieces, and the middle part realizes front and back folding through folding pieces. The front frame and the rear frame are both double-layer design, cooperate with the connecting piece and the folding piece of special slot type structure, and ensure that the folding process is stable and smooth. The design not only guarantees the bearing strength when unfolding, but also can quickly fold and save space, especially suitable for the occasions needing to frequently transport various photographic equipment.

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Description

Technical Field

[0001] This utility model relates to the field of handcart technology, specifically to a double-layer folding handcart. Background Technology

[0002] Handcarts are commonly used in daily life and work for transporting items. They are often used for short distances or small quantities of goods. Ordinary handcarts are flexible and suitable for environments where motor vehicles are inconvenient. As a short-distance transport tool, the portability and stability of handcarts directly affect the user experience. However, existing handcarts still have significant drawbacks: most are single-layer structures, with limited platform space for placing items, making them unsuitable for transporting items that cannot be directly stacked, such as photographic equipment, requiring multiple trips. Therefore, based on the above problems, this utility model proposes a double-layer folding handcart to solve these issues. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a double-layer folding handcart is provided. The improved design achieves a multi-layer structure, increasing space utilization and providing a better user experience; the improved frame structure enhances the handcart's stability and provides better load-bearing capacity.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] A double-layer folding handcart includes a frame assembly with four wheel assemblies at its bottom. The frame assembly includes four uprights, with each wheel assembly corresponding to one of the uprights. The two front uprights and the two rear uprights are fixed together from bottom to top by several crossbars, which divide the frame assembly into several layers from bottom to top. Between the corresponding front and rear crossbars, a base frame assembly, several intermediate frame assemblies, and a top frame assembly are arranged from bottom to top, connected by the base frame assembly and the intermediate frame assemblies. The top frame assembly forms a multi-layer structure; the front and rear sides of the underframe assembly, intermediate frame assembly, and top frame assembly are all hinged to the frame assembly, and the middle part of the underframe assembly, intermediate frame assembly, and top frame assembly are all foldable structures; the underframe assembly includes connecting frames that connect the front and rear uprights on the front and rear sides respectively, the connecting frames include a front frame and a rear frame, the front end of the front frame is hinged to the front upright and the rear end of the rear frame is hinged to the rear upright through connecting parts, the rear end of the front frame and the front end of the rear frame are hinged through folding parts, and both the front frame and the rear frame are double-layer structures.

[0006] Furthermore, the intermediate frame assembly and the underframe assembly have the same structure.

[0007] Furthermore, the upper and lower layers of the double-layered front and rear frame structure are respectively hinged to the connecting parts.

[0008] Furthermore, the front side of the connector is fixedly connected to the front upright. The connector has a connecting groove that is closed at the bottom and open at the top and rear. The end of the front frame enters the connecting groove from the rear side and is embedded in the connecting groove in a stacked manner and is hinged to the connector respectively. The hinge axis of the upper layer of the front frame is forward than the hinge axis of the lower layer of the front frame. The cooperation method between the rear connector and the rear frame corresponds to the cooperation method between the front connector and the front frame.

[0009] Furthermore, the folding component has a folding groove that is closed at the top and open at the front, rear, and bottom sides. The end of the front frame enters from the front side of the folding groove and is embedded in the folding groove by stacking on top of each other and is hinged to the folding component. The hinge axis of the upper layer of the front frame is forward of the hinge axis of the lower layer of the front frame. The rear frame is connected to the folding component in a manner corresponding to the front frame.

[0010] Furthermore, a limit plate is provided at the rear end of the lower layer of the front frame, and an arc-shaped track groove is provided on the folding part. A limit pin is provided on the limit plate, and the limit pin passes through the track groove and is fixed to the limit plate. The lower rear frame corresponds to the form of the front frame.

[0011] Furthermore, the base frame assembly, intermediate frame assembly, and top frame assembly are all equipped with frame frames, which consist of front and rear sections.

[0012] Furthermore, push-pull rods are provided on the front or rear sides of the frame assembly.

[0013] Furthermore, push-pull handles are provided on the front or rear side of the frame assembly.

[0014] Furthermore, the upper layer of the front frame includes a frame body, and the lower layer includes two bottom tubes that are symmetrically arranged on the left and right sides; the side tubes on the left and right sides of the frame body are arranged parallel to the two bottom tubes, and the rear ends of the side tubes and bottom tubes of the front frame are simultaneously hinged to the front ends of the side tubes and bottom tubes of the rear frame. The front ends of the side tubes and bottom tubes of the front frame are both hinged to the front crossbar, and the rear ends of the side tubes and bottom tubes of the rear frame are hinged to the rear crossbar.

[0015] Furthermore, an extension frame is provided on the front side of the chassis assembly, and the extension frame is located on the front side of the underframe assembly.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] First, high space utilization: The multi-layered structure formed by the base frame, middle frame, and top frame allows for the placement of different equipment on different levels, increasing the storage surface and facilitating the categorized storage and transportation of different types of items. This achieves three-dimensional storage and significantly improves transportation efficiency. After folding, each layer of the frame can be compactly stacked, reducing space occupation and avoiding direct stacking of items, thus facilitating storage and transportation. Second, convenient folding: The double-layered structure design of the connecting frame with front and rear hinges, along with the rear frame and folding components, combined with the arc-shaped track groove and limit pins, enables synchronous and linked folding of the frame, making operation simple and quick. The open slot structure design of the connecting and folding components ensures that the hinge shafts are staggered, avoiding movement interference and making the folding process smoother.

[0018] Third, strong structural stability: The double-layer frame design, combined with the limiting plate and track groove, forms a rigid support in the unfolded state, preventing the frame from collapsing unexpectedly; the frame structure composed of uprights and crossbars provides overall stability and is suitable for supporting heavy equipment such as photography equipment.

[0019] Fourth, scalability and adaptability: The number of intermediate rack assemblies can be flexibly increased or decreased to adapt to the transportation needs of different quantities of equipment and items of different sizes; the extension rack design further expands the load-bearing area to meet the needs of special scenarios;

[0020] Fifth, ergonomic optimization: the multi-position design of the push rod or handrail adapts to different user operating habits and improves the comfort of pushing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0022] Figure 2 This is a structural schematic diagram of the base frame assembly according to an embodiment of the present utility model.

[0023] Figure 3 This is a schematic diagram of the connector structure according to an embodiment of the present utility model.

[0024] Figure 4 This is a structural schematic diagram of the folding component according to an embodiment of the present utility model.

[0025] Figure 5 This is a schematic diagram of the rear end of the front frame according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of a split-state structure according to an embodiment of the present utility model.

[0027] In the diagram: 1. Frame assembly, 2. Wheel assembly, 3. Upright pole, 4. Crossbar, 5. Base frame assembly, 6. Intermediate frame assembly, 7. Top frame assembly, 8. Connecting frame, 9. Front frame, 91. Frame body, 91a. Side tube, 92. Bottom tube, 10. Rear frame, 11. Connector, 12. Folding piece, 13. Connecting slot, 14. Folding slot, 15. Limiting plate, 16. Track slot, 17. Frame, 18. Push-pull rod, 19. Push-pull handle, 20. Extension frame, 21. Adjustment button. Detailed Implementation

[0028] To make the technical problems, technical solutions and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] In view of the current problems of handcarts, this utility model provides a double-layer frame folding handcart.

[0031] like Figures 1-6 As shown, the handcart includes a frame assembly 1, and four wheel assemblies 2 are mounted on the bottom of the frame assembly 1. The frame assembly 1 and the wheel assemblies 2 constitute the main structure of the entire handcart.

[0032] Specifically, the frame assembly 1 includes four uprights 3, with wheel assemblies 2 corresponding to each upright 3. The front wheel assembly 2 is equipped with a brake, which is a pre-made component. The two front uprights 3 and the two rear uprights 3 are connected from bottom to top by several crossbars 4. The number and layers of crossbars 4 are determined as needed. The crossbars 4 divide the frame assembly 1 into several layers from bottom to top. The crossbars 4 provide a certain degree of stability and fixation for the front and rear uprights 3.

[0033] Between the two corresponding crossbars 4 at the front and rear, a base frame assembly 5, several intermediate frame assemblies 6 and a top frame assembly 7 are arranged from bottom to top, forming a multi-layer structure. The front and rear sides of the base frame assembly 5, intermediate frame assembly 6 and top frame assembly 7 are all hinged to the frame assembly 1, and the middle part of the base frame assembly 5, intermediate frame assembly 6 and top frame assembly 7 are all foldable structures.

[0034] To achieve the articulated layout between the underframe assembly 5 and the front and rear frame assemblies 1, specifically: the underframe assembly 5 includes connecting frames 8 that connect to the front and rear uprights 3 on the front and rear sides respectively. The connecting frames 8 include a front frame 9 and a rear frame 10. The front end of the front frame 9 is hinged to the front upright 3, and the rear end of the rear frame 10 is hinged to the rear upright 3 via connecting pieces 11. The rear end of the front frame 9 and the front end of the rear frame 10 are hinged via folding pieces 12. Both the front frame 9 and the rear frame 10 are double-layered structures. Furthermore, the upper and lower layers of the double-layered structure of the front frame 9 and the rear frame 10 are respectively hinged to the connecting pieces 11.

[0035] Regarding the specific detailed design of the folding component 12, the front side connector 11 is fixedly connected to the front side upright 3. The connector 11 has a connecting groove 13 that is closed at the bottom and open at the top and rear. The end of the front frame 9 enters the connecting groove 13 from the rear side and is embedded in the connecting groove 13 in a stacked manner and is hinged to the connector 11 respectively. The hinge axis of the upper layer of the front frame 9 is forward than the hinge axis of the lower layer of the front frame 9. The cooperation method between the rear connector 11 and the rear frame 10 corresponds to the cooperation method between the front connector 11 and the front frame 9.

[0036] The intermediate frame assembly 6 has the same structure as the base frame assembly 5. The top frame assembly 7 can be configured to have the same structure as the base frame assembly 5, or it can adopt a simpler existing method.

[0037] To achieve the foldable effect of the base frame assembly 5, specifically: the folding component 12 has a folding groove 14 that is closed at the top, open at the front and rear sides and at the bottom. The end of the front frame 9 enters from the front side of the folding groove 14 and is embedded in the folding groove 14 in a stacked manner and is respectively hinged to the folding component 12. The hinge axis of the upper layer of the front frame 9 is further forward than the hinge axis of the lower layer of the front frame 9. The double-layer rear frame 10 is connected to the folding component 12 in a manner corresponding to the front frame 9.

[0038] To further facilitate folding, a limiting plate 15 is provided at the rear end of the lower layer of the front frame 9. An arc-shaped track groove 16 is provided on the folding component 12. A limiting pin is provided on the limiting plate 15. The limiting pin passes through the track groove 16 and is fixed to the limiting plate 15. The lower rear frame 10 corresponds to the form and structure of the front frame 9.

[0039] The intermediate frame assembly 6 and the top frame assembly 7 adopt a folding component 12 structure similar to or the same as that of the bottom frame assembly 5.

[0040] Regarding the aforementioned handcart, the base frame assembly 5, the intermediate frame assembly 6, and the top frame assembly 7 are all equipped with a frame 17. The frame 17 consists of two parts, front and back, to facilitate folding. The frame 17 is preferably made of a metal frame with a hollow bottom.

[0041] The front frame 9 and the rear frame 10 have the same structure. Specifically, the upper layer includes a frame 91, and the lower layer includes two bottom tubes 92 that are symmetrical on the left and right. The side tubes 91a on the left and right sides of the frame are arranged parallel to the two bottom tubes 92. The rear ends of the side tubes and bottom tubes of the front frame 9 are simultaneously hinged to the front ends of the side tubes and bottom tubes of the rear frame 10. The front ends of the side tubes and bottom tubes of the front frame 9 are both hinged to the front crossbar 4. The rear ends of the side tubes and bottom tubes of the rear frame 10 are hinged to the rear crossbar 4.

[0042] Meanwhile, a push-pull rod 18 is provided on the front or rear side of the frame assembly 1 of the aforementioned handcart, and a push-pull handle 19 is provided on the front or rear side of the frame assembly 1. The push-pull handle 19 is provided with a button 21 for adjusting the rotation of the push-pull handle 19 relative to the upright 3. This rotation adjustment method is existing technology and will not be described in detail. For example, the adjustment method of adjusting the rotation of the handle tube by using the folding button as disclosed in CN221757599 U can be used, or other conventional rotation adjustment structures can be used.

[0043] An extension frame 20 is also provided on the front side of the frame assembly 1, and the extension frame 20 is located on the front side of the underframe assembly 5.

[0044] The push-pull rod 18 and push-pull handle make it easy to operate the trolley, and the extension rack 20 provides more cargo space.

[0045] The above-mentioned handcart is shown in the open state as shown in the figure. When it needs to be folded, remove the upper frame 17, lift the middle of the connecting frame 8 upward, and then arch the middle of the handcart upward with the front and rear parts as the symmetrical plane, so as to achieve the overall folding by folding the front frame 9 and the rear frame 10.

[0046] The aforementioned handcarts not only have high space utilization and are easy to fold, but also provide more loading platforms and have good stability.

[0047] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A double-layer folding handcart, comprising a frame assembly (1), four wheel assemblies (2) disposed at the bottom of the frame assembly (1), the frame assembly (1) comprising four uprights (3), the wheel assemblies (2) and the uprights (3) being disposed in a one-to-one correspondence; characterized in that: The two front uprights (3) and the two rear uprights (3) are fixed from bottom to top by several crossbars (4). The crossbars (4) divide the frame assembly (1) into several layers from bottom to top. Between the two corresponding crossbars (4), the bottom frame assembly (5), several intermediate frame assemblies (6) and the top frame assembly (7) are arranged from bottom to top, forming a multi-layer structure. The front and rear sides of the bottom frame assembly (5), intermediate frame assembly (6) and top frame assembly (7) are all connected to the frame assembly (1). 1) Hinged, the middle of the base frame assembly (5), the intermediate frame assembly (6) and the top frame assembly (7) are all foldable structures in the front and back; the base frame assembly (5) includes connecting frames (8) that connect the front and rear uprights (3) on the front and rear sides respectively. The connecting frames (8) include a front frame (9) and a rear frame (10). The front end of the front frame (9) is hinged to the front upright (3) and the rear end of the rear frame (10) is hinged to the rear upright (3) through connecting piece (11). The rear end of the front frame (9) and the front end of the rear frame (10) are hinged through folding piece (12). The front frame (9) and the rear frame (10) are both double-layer structures.

2. The double-layer frame folding handcart according to claim 1, characterized in that: The intermediate frame assembly (6) has the same structure as the base frame assembly (5).

3. A double-layer frame folding handcart according to claim 1, characterized in that: The upper and lower layers of the double-layer structure of the front frame (9) and the rear frame (10) are respectively hinged to the connecting piece (11).

4. A double-layer frame folding handcart according to claim 1, characterized in that: The front side of the connector (11) is fixedly connected to the front upright (3). The connector (11) has a connecting groove (13) that is closed at the bottom and open at the top and rear. The end of the front frame (9) enters the connecting groove (13) from the rear side of the connecting groove (13) and is embedded in the connecting groove (13) by stacking them up and down and is hinged to the connector (11) respectively. The hinge shaft of the upper layer of the front frame (9) is forward than the hinge shaft of the lower layer of the front frame (9). The matching method between the rear connector (11) and the rear frame (10) corresponds to the matching method between the front connector (11) and the front frame (9).

5. A double-layer frame folding handcart according to claim 1 or 4, characterized in that: The folding component (12) has a folding groove (14) that is closed at the top, open at the front and rear sides and at the bottom. The end of the front frame (9) enters from the front side of the folding groove (14) and is embedded in the folding groove (14) in a stacked manner and is hinged to the folding component (12) respectively. The hinge axis of the upper layer of the front frame (9) is forward than the hinge axis of the lower layer of the front frame (9). The rear frame (10) is connected to the folding component (12) in a manner corresponding to the front frame (9).

6. A double-layer frame folding handcart according to claim 4, characterized in that: A limiting plate (15) is provided at the rear end of the lower layer of the front frame (9). An arc-shaped track groove (16) is provided on the folding part (12). A limiting pin is provided on the limiting plate (15). The limiting pin passes through the track groove (16) and is fixed to the limiting plate (15). The lower rear frame (10) corresponds to the form of the front frame (9).

7. A double-layer frame folding handcart according to claim 1, characterized in that: The base frame assembly (5), the intermediate frame assembly (6) and the top frame assembly (7) are all equipped with a frame (17), which consists of two parts: front and rear.

8. A double-layer frame folding handcart according to claim 1, characterized in that: The frame assembly (1) is provided with a push-pull rod (18) and / or a push-pull handle (19) on the front or rear side.

9. A double-layer frame folding handcart according to claim 1, characterized in that: The upper layer of the front frame (9) includes a frame body, and the lower layer includes two bottom tubes that are symmetrical on the left and right. The side tubes on the left and right sides of the frame body are arranged parallel to the two bottom tubes. The rear end of the side tube and the rear end of the bottom tube of the front frame (9) are simultaneously hinged to the front end of the side tube and the front end of the bottom tube of the rear frame (10). The front end of the side tube and the front end of the bottom tube of the front frame (9) are both hinged to the front crossbar (4). The rear end of the side tube and the rear end of the bottom tube of the rear frame (10) are hinged to the rear crossbar (4).

10. A double-layer frame folding handcart according to claim 1, characterized in that: An extension frame (20) is provided on the front side of the frame assembly (1), and the extension frame (20) is located on the front side of the underframe assembly (5).