A caster fixing structure of a shopping cart

Abstract

A shopping cart caster fixing structure belongs to the technical field of commercial facilities. The shopping cart includes a frame and a frame body. The frame includes a pair of supports and a bottom frame at the bottom of the pair of supports. The two ends of the rear side of the bottom frame are respectively fixed with the bottom ends of the pair of supports. The bottom frame is provided with a front wheel fixing cross beam at the bottom near the front end. The front wheel fixing cross beam is respectively fixed with a front roller at the lower position of the left and right ends. A rear roller is respectively fixed and installed on the outer side bottom of the pair of supports. The rear roller includes a wheel body, a wheel body support connected with the wheel body, a connecting seat in rotation cooperation with the wheel body support, a threaded shaft fixedly connected with the connecting seat, and a mounting seat installed on the support and driven to lift the wheel body relative to the support through the threaded cooperation with the threaded shaft. The advantages are that the supporting stability of the shopping cart is improved, and the shopping cart has the adjusting ability to adapt to different road conditions.

Description

Technical Field

[0001] This utility model belongs to the field of commercial facility technology, specifically relating to a caster fixing structure for a shopping cart. Background Technology

[0002] Shopping carts are commonly used in retail stores and supermarkets, and their flexibility and stability are key performance indicators. Casters, as the core component directly bearing the weight of the cart and enabling movement, have a structural design that directly impacts the user experience.

[0003] Traditional shopping carts typically have casters mounted directly below the end of a support frame at the bottom of the cart. The casters are connected to a fixed base at the bottom of the cart via a vertically downward-pointing wheel fork bracket. While this connection method is structurally simple, it suffers from stability defects in actual use. Existing technologies have attempted to improve stability by adding auxiliary support wheels or using more complex suspension systems, but these solutions are often structurally complex, costly, and have poor durability, making them difficult to adopt in large-scale commercial scenarios.

[0004] Therefore, the industry urgently needs a caster fixing solution that is simple in structure, low in modification cost, and can fundamentally enhance the stability of shopping carts. The applicant has made a beneficial design, and the technical solution to be introduced below is generated in this context. Utility Model Content

[0005] The purpose of this invention is to provide a caster fixing structure for a shopping cart, which improves the stability of the cart by optimizing the caster installation method.

[0006] The purpose of this utility model is to provide a caster fixing structure for a shopping cart. The shopping cart includes a frame and a housing mounted on the frame. The frame includes a pair of symmetrically arranged supports and a base frame located at the bottom of the supports. A handle is connected between the upper ends of the pair of supports. The two ends of the rear side of the base frame are respectively fixed to the bottom ends of the pair of supports. A front wheel fixing beam is provided at the bottom of the base frame near the front end. A front roller is fixedly installed at the lower position of each of the left and right ends of the front wheel fixing beam. The feature is that a rear roller is fixedly installed at the bottom of the outer sides of the pair of supports facing each other. The rear roller includes a wheel body, a wheel body support connected to the wheel body axle, a connecting seat rotatably engaged with the wheel body support, a threaded shaft fixedly connected to the connecting seat, and a mounting seat mounted on the support and driven to lift the wheel body relative to the support by threaded engagement with the threaded shaft.

[0007] In a specific embodiment of this utility model, the mounting base is arranged side by side with the bracket and its side is fixed to the bracket. The mounting base has a threaded hole with a downward opening in the middle and along the height direction. The bottom end of the threaded shaft is fixedly set in the middle of the connecting base. The threaded shaft is screwed upward into the threaded hole and threadedly engaged with the threaded hole.

[0008] In another specific embodiment of this utility model, the frame further includes a rear frame piece. The frame has an opening on the rear side and a connecting frame is provided at the opening. The rear frame piece extends upward on the left and right sides to form hooks. The hooks are hung on the top beam of the connecting frame, so that the rear frame piece can be rotated inward about the top beam as the rotation center.

[0009] In another specific embodiment of this utility model, the base frame has a near-U-shaped structure that is narrow at the front end and wide at the rear end.

[0010] In another specific embodiment of this utility model, a shelf is provided above the base frame, and a pair of base frame baffles are symmetrically provided on the left and right sides of the shelf. A frame crossbeam is connected between the pair of supports at a position slightly below the middle in the height direction. The front end of the shelf is fixedly connected to the front wheel fixing crossbeam, and the rear end is bent upward and extended to be fixedly connected to the frame crossbeam. The bottom of the pair of base frame baffles is fixedly connected to the base frame, and the upper part is fixedly connected to the pair of supports.

[0011] In another specific embodiment of this utility model, the shelf is bent upward at the front end to form a retaining edge.

[0012] In a further specific embodiment of this utility model, the frame has a frame frame between the pair of supports. The frame frame is gradually inclined downward from the rear end to the front end. The left and right sides of the middle rear position of the frame frame are respectively fixed to the pair of supports. A frame support beam is also provided between the pair of supports and above the vehicle frame crossbeam. The front support of the frame is fixed to the front end of the frame frame, and the rear support is fixed to the frame support beam.

[0013] In a more specific embodiment of this utility model, the front roller and the rear roller are omnidirectional wheels.

[0014] The present invention, due to the adoption of the above-mentioned structure, has the following advantages compared with the prior art: Firstly, it increases the distance between the rear rollers, significantly widens the support base on the rear side of the shopping cart, and makes the load-bearing more secure and stable; secondly, by adjusting the height of the rear rollers through the threaded structure, the load distribution of the front and rear parts of the cart can be precisely balanced to adapt well to various ground surfaces and expand the applicability of the shopping cart; thirdly, the overall structure is simple, low in cost, and easy to maintain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0016] In the diagram: 1. Frame, 11. Bracket, 12. Base frame, 121. Front wheel fixing beam, 13. Storage rack, 131. Edge, 14. Base frame retaining strip, 15. Frame crossbeam, 16. Frame support beam; 2. Frame, 21. Connecting frame, 211. Top beam, 22. Rear frame piece, 221. Hook, 23. Frame frame; 3. Handrail; 4. Front roller, 5. Rear roller, 51. Wheel body, 52. Wheel body bracket, 53. Connecting seat, 54. Threaded shaft, 55. Mounting seat, 551. Threaded hole. Detailed Implementation

[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0018] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0019] Please see Figure 1 This utility model relates to a wheel fixing structure for a shopping cart, including a frame 1 and a housing 2 mounted on the frame 1. The frame 1 includes a pair of symmetrically arranged supports 11 and a base frame 12 located at the bottom of the pair of supports 11, with a handle 3 connected between the upper ends of the pair of supports 11. The base frame 12 has a near-U-shaped structure, narrow at the front and wide at the rear, and the two ends of the rear side of the base frame 12 are respectively fixed to the bottom ends of the pair of supports 11.

[0020] Furthermore, a shelf 13 is provided above the base frame 12, and a pair of base frame baffles 14 are symmetrically arranged on the left and right sides of the shelf 13. A front wheel fixing crossbeam 121 is provided at the bottom of the base frame 12 near the front end, and a frame crossbeam 15 is connected between the pair of supports 11 at a lower position in the height direction. The front end of the shelf 13 is fixedly connected to the front wheel fixing crossbeam 121, and the rear end bends upward and extends to be fixedly connected to the frame crossbeam 15. The shelf 13 has an upward bend at the front end forming a retaining edge 131. The bottom of the pair of base frame baffles 14 is fixedly connected to the base frame 12, and the upper part is fixedly connected to the pair of supports 11.

[0021] The frame 2 has a frame frame 23 between the pair of supports 11. The frame frame 23 is gradually inclined downward from the rear end to the front end. The left and right sides of the middle rear position of the frame frame 23 are fixed to the pair of supports 11 respectively. A frame support beam 16 is also provided between the pair of supports 11 and above the frame crossbeam 15. The front support of the frame 2 is fixed to the front end of the frame frame 23, and the rear support is fixed to the frame support beam 16. The frame 2 has an opening on the rear side, and a connecting frame 21 is provided at the opening. A rear frame piece 22 is rotatably provided on the connecting frame 21. Specifically, the rear frame 22 extends a pair of hooks 221 from the upper ends on both the left and right sides. The hooks 221 are hung on the top beam 211 connecting the frame 21, so that the rear frame 22 can be flipped inward with the top beam 211 as the rotation center, so as to facilitate the retrieval and placement of heavier goods by horizontal movement, or to facilitate the formation of a stacking channel by flipping the rear frame 22 when two shopping carts need to be stacked.

[0022] Furthermore, this utility model also includes a pair of front rollers 3 and a pair of rear rollers 4. Preferably, the front rollers 3 and the pair of rear rollers 4 are all-purpose wheels. The front rollers 3 are fixedly installed at the lower positions of the left and right ends of the front wheel fixing beam 121. As a key technical feature of this utility model, the rear rollers 4 are no longer directly installed below the bottom of the bracket 11, but are fixedly installed on the outer bottom of the pair of brackets 11 facing each other. This increases the lateral distance between the pair of rear rollers 5, significantly widening the support base at the rear of the shopping cart, making the load-bearing safer and more stable, and the pushing smoother.

[0023] Furthermore, the rear roller 5 includes a wheel body 51, a wheel body bracket 52 connected to the wheel body 51 axle, a connecting seat 53 rotatably engaged with the wheel body bracket 52 via a bearing, a threaded shaft 54 ​​fixed at the bottom end in the middle of the connecting seat 53, and a mounting seat 55 fixedly connected to the bracket 11. The mounting seat 55 is arranged side by side with the bracket 11 and its side is fixedly attached to the bracket 11. The mounting seat 55 has a threaded hole 551 with a downward opening in the middle and along the height direction. The threaded shaft 54 ​​is screwed upward into the threaded hole 551. By engaging with the threaded hole 551, the wheel body 51 is raised and lowered relative to the mounting seat 55, thereby adjusting the height of the rear roller 5. This allows for precise balance of the load distribution between the front and rear parts of the vehicle body, adapting well to various terrains and expanding the applicability of the trolley.

[0024] This invention does not require changes to the main structure of the shopping cart, which facilitates its rapid application and widespread adoption on existing shopping carts. It improves the stability of the shopping cart and enables it to adapt to different road conditions, thus achieving the purpose of the invention.

Claims

1. A caster fixing structure for a shopping cart, the shopping cart comprising a frame (1) and a frame (2) mounted on the frame (1), the frame (1) comprising a pair of symmetrically arranged supports (11) and a base frame (12) located at the bottom of the pair of supports (11), a handle (3) being connected between the upper ends of the pair of supports (11), the two ends of the rear side of the base frame (12) being fixed to the bottom ends of the pair of supports (11), and a front wheel fixing beam (121) being provided at the bottom of the base frame (12) near the front end, wherein a front roller (4) is fixedly installed at the lower position of the left and right ends of the front wheel fixing beam (121), characterized in that: A rear roller (5) is fixedly installed on the outer bottom of the pair of brackets (11) facing each other. The rear roller (5) includes a wheel body (51), a wheel body bracket (52) connected to the wheel body (51) axle, a connecting seat (53) rotatably engaged with the wheel body bracket (52), a threaded shaft (54) fixedly connected with the connecting seat (53), and a mounting seat (55) installed on the bracket (11) and driven to lift the wheel body (51) relative to the bracket (11) by threaded engagement with the threaded shaft (54).

2. The caster fixing structure for a shopping cart according to claim 1, characterized in that: The mounting base (55) is arranged side by side with the bracket (11) and its side is fixed to the bracket (11). The mounting base (55) has a threaded hole (551) with a downward opening in the middle and along the height direction. The bottom end of the threaded shaft (54) is fixedly set in the middle of the connecting base (53). The threaded shaft (54) is screwed upward into the threaded hole (551) and threadedly engaged with the threaded hole (551).

3. The caster fixing structure for a shopping cart according to claim 1, characterized in that: The frame (2) further includes a rear frame piece (22). The frame (2) has an opening on the rear side and a connecting frame (21) is provided at the opening. The rear frame piece (22) extends upward on the left and right sides to form hooks (221). The hooks (221) are hung on the top beam (211) of the connecting frame (21), so that the rear frame piece (22) can be rotated inward about the top beam (211) as the rotation center.

4. The caster fixing structure for a shopping cart according to claim 1, characterized in that: The base frame (12) has a near-U-shaped structure that is narrow at the front end and wide at the rear end.

5. The caster fixing structure for a shopping cart according to claim 1, characterized in that: A shelf (13) is provided above the base frame (12), and a pair of base frame baffles (14) are symmetrically provided on the left and right sides of the shelf (13). A frame crossbeam (15) is connected between the pair of brackets (11) at a position slightly below the middle in the height direction. The front end of the shelf (13) is fixedly connected to the front wheel fixing crossbeam (121), and the rear end is bent upward and extended to be fixedly connected to the frame crossbeam (15). The bottom of the pair of base frame baffles (14) is fixedly connected to the base frame (12), and the upper part is fixedly connected to the pair of brackets (11).

6. The caster fixing structure for a shopping cart according to claim 5, characterized in that: The shelf (13) is bent upward at the front end to form a retaining edge (131).

7. The caster fixing structure for a shopping cart according to claim 5, characterized in that: The frame (2) has a frame frame (23) between the pair of supports (11). The frame frame (23) is gradually inclined downward from the rear end to the front end. The left and right sides of the middle rear position of the frame frame (23) are respectively fixed to the pair of supports (11). A frame support beam (16) is also provided between the pair of supports (11) and above the frame crossbeam (15). The front support of the frame (2) is fixed to the front end of the frame frame (23), and the rear support is fixed to the frame support beam (16).

8. The caster fixing structure for a shopping cart according to claim 1, characterized in that: The front roller (4) and rear roller (5) are omnidirectional wheels.

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