Folding structure of wheelchair frame

Abstract

A wheelchair frame folding structure comprises wheelchair frames on both sides for overall support and a folding mechanism connected between the wheelchair frames on both sides, the wheelchair frames on both sides comprise an upper crossbeam and a lower crossbeam for connecting the folding mechanism, the upper crossbeam and the lower crossbeam are parallel to each other, the folding mechanism comprises two groups of folding rods cross-hinged to each other, and two groups of connecting rods respectively connected to the upper parts of the two groups of folding rods, the hinge points of the two groups of folding rods are set in the middle of the rod body, and the adjustable connecting rod is connected between the upper crossbeam and the folding rod, and the length of the connecting rod L1 is adjusted so that L1+L2 is equal to L3+L4. When the folding mechanism is folded, the wheelchair frames on both sides can be completely closed together, so that the folding effect is optimal and the space occupied is minimized.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a folding structure of a wheelchair frame. Background Art

[0002] With the advancement of society and medical technology, wheelchairs have become essential tools for many people with limited mobility. However, traditional wheelchairs are bulky and heavy, making them difficult to carry and store. Therefore, designing a wheelchair frame structure that can be easily folded and unfolded is crucial for improving its portability and practicality.

[0003] Among the existing wheelchairs, reference can be made to the folding wheelchair disclosed in the Chinese utility model patent application number CN202120368044.5, which includes a wheelchair frame, a rear wheel assembly and a front wheel assembly; the rear wheel assembly is coupled to the rear end of the wheelchair frame, wherein the front wheel assembly includes two front wheels, and the front wheels are detachably arranged at the front end of the wheelchair frame, and the front wheels include a front wheel unit and a front wheel support shaft, and the front wheel unit is coupled to the front wheel support shaft, and the front wheel support shaft is detachably arranged at the lower end of the wheelchair frame.

[0004] In the above structure, a folding mechanism is provided in the middle of the wheelchair frames on both sides so that the wheelchair frames on both sides are brought closer to each other to form a folding effect. However, in the folding mechanism, the two intersecting folding units lack reasonable coordination, so that the wheelchair frames on both sides cannot be brought closer together, resulting in a poor folding effect. After folding, there is still a large thickness and a large space is occupied. Therefore, the folding mechanism needs to be improved. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a wheelchair frame folding structure.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A wheelchair frame folding structure includes wheelchair frames on both sides for overall support and a folding mechanism connected between the wheelchair frames on both sides, the wheelchair frames on both sides include an upper crossbeam and a lower crossbeam for connecting the folding mechanism, the upper crossbeam and the lower crossbeam are parallel to each other, the folding mechanism includes two groups of folding rods cross-hinged with each other, and two groups of connecting rods respectively connected to the upper parts of the two groups of folding rods, the hinge points of the two groups of folding rods are located in the middle of the rod body, the lower ends of the two groups of folding rods are respectively hinged to the lower crossbeams of the left and right wheelchair frames, and the upper parts of the two groups of folding rods are respectively connected by The rod is connected to the upper cross beams of the right and left wheelchair frames, and the two ends of the connecting rod are hinged to the upper cross beam and the folding rod respectively. The connecting rod includes a sleeve rod for rotatably sleeved on the upper cross beam and an adjusting rod for hinged on the folding rod. The adjusting rod is adjustably inserted in the sleeve rod. The length of the adjusting rod is L1, the distance between the upper cross beam and the lower cross beam is L2, the distance from the lower cross beam to the hinge point of the two groups of folding rods is L3, and the distance from the hinge point of the two groups of folding rods to the hinge point between the adjusting rod and the folding rod is L4. The distance L1+L2 is equal to L3+L4.

[0008] In the utility model, the sleeve rod is provided with an insertion hole for inserting the adjusting rod and a fixing hole connected to the insertion hole. The adjusting rod is provided with an adjustment groove corresponding to the fixing hole. The inner side of the adjusting groove is provided with a serrated structure. After the adjusting rod is inserted into the insertion hole, a fastening bolt is passed through the fixing hole and the adjustment groove in sequence to fix the adjusting rod in the sleeve rod.

[0009] Furthermore, the fixing hole passes through the sleeve rod, and the adjusting slot passes through the adjusting rod.

[0010] In the present invention, the bottom end of the folding rod is connected to the lower crossbeam through a connecting piece, one end of the connecting piece is fixedly connected to the folding rod, and the other end is slidably sleeved on the lower crossbeam. The connecting piece is a plastic piece.

[0011] In the present invention, the folding mechanism is provided with two groups, and the two groups of folding mechanisms are arranged in parallel front and back. The upper ends of the two groups of folding rods are respectively provided with support rods for installing the seat. In the two groups of folding mechanisms, the upper ends of the folding rods on the same side are connected to the same support rod and move synchronously.

[0012] In the present invention, cushion blocks are provided at the hinges of the two groups of folding rods and at the hinges of the folding rods and the connecting rods. One side of the cushion block is a curved structure adapted to the folding rod body, and the other side is a flat structure.

[0013] The utility model has the following advantages and beneficial effects:

[0014] Two sets of cross-hinged folding rods are set between the wheelchair frames on both sides, and the hinge points of the two sets of folding rods are set in the middle of the rod body. At the same time, an adjustable connecting rod is connected between the upper crossbeam and the folding rod. By adjusting the length of the connecting rod L1 so that L1+L2 is equal to L3+L4, when the folding mechanism is folded, the wheelchair frames on both sides can be completely closed together, thereby achieving the best folding effect and minimizing space occupation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 is a schematic diagram of the wheelchair in the unfolded state in this embodiment;

[0017] Figure 2 Schematic diagram of the installation of the folding mechanism in this embodiment;

[0018] Figure 3 for Figure 2 Enlarged view of area A in the middle;

[0019] Figure 4 This is a disassembled diagram of the connecting rod in this embodiment;

[0020] Figure 5 is a front view of the folding mechanism in this embodiment;

[0021] Figure 6 Schematic diagram of the wheelchair in the folded state in this embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention, but the present invention is not limited to the following embodiments.

[0023] like Figures 1 to 6As shown, this embodiment discloses a wheelchair frame folding structure, including wheelchair frames 1 on both sides for overall support and a folding mechanism 2 connected between the wheelchair frames 1 on both sides, the folding mechanism 2 drives the wheelchair frames 1 on both sides to close together to form a folded shape, the wheelchair frames 1 on both sides are symmetrical to each other and both include an upper crossbeam 11 and a lower crossbeam 12 for connecting the folding mechanism 2, the upper crossbeam 11 and the lower crossbeam 12 are parallel to each other and installed horizontally, the folding mechanism 2 includes two groups of folding rods 21 with the same structure and cross-hinged to each other, and two groups of connecting rods 22 with the same structure and respectively connected to the upper parts of the two groups of folding rods 21, specifically, the hinge points of the two groups of folding rods 21 are located in the middle of the rod body, the lower ends of the two groups of folding rods 21 are respectively hinged to the lower crossbeams 12 of the left and right wheelchair frames 1, and the two groups of folding rods 21 The upper part is connected to the upper crossbeam 11 of the right and left wheelchair frames 1 respectively through connecting rods 22, and the upper ends of the two groups of folding rods 21 are respectively provided with support rods 23 for installing the seat, and the two ends of the connecting rod 22 are respectively hinged to the upper crossbeam 11 and the folding rod 21. The connecting rod 22 includes a sleeve rod 221 for rotatably sleeved on the upper crossbeam 11 and an adjusting rod 222 for hinged on the folding rod 21. The adjusting rod 222 can be adjustably inserted in the sleeve rod 221 to achieve length adjustment. Suppose the length of the adjusting rod 222 is L1, the distance between the upper crossbeam 11 and the lower crossbeam 12 is L2, the distance from the lower crossbeam 12 to the hinge point of the two groups of folding rods 21 is L3, and the distance from the hinge point of the two groups of folding rods 21 to the hinge point between the adjusting rod 222 and the folding rod 21 is L4, and L1+L2 is equal to L3+L4. By adjusting the length of the connecting rod 22L1 so that L1+L2 equals L3+L4, the wheelchair frames 1 on both sides can be completely closed together after the folding mechanism 2 is folded, thereby achieving the best folding effect and minimizing space occupation.

[0024] In this embodiment, the sleeve rod 221 is provided with an insertion hole 223 for inserting the adjustment rod 222, and a fixing hole 224 communicating with the insertion hole 223. The adjustment rod 222 is provided with an adjustment slot 225 corresponding to the fixing hole 224. The inner side of the adjustment slot 225 is provided with a serrated structure 226 for improving the fixing effect. Preferably, the fixing hole 224 extends through the sleeve rod 221, and the adjustment slot 225 extends through the adjustment rod 222. After the adjustment rod 222 is inserted into the insertion hole 223, a fastening bolt is sequentially passed through the fixing hole 224 and the adjustment slot 225, thereby securing the adjustment rod 222 within the sleeve rod 221. When the length of the connecting rod 22L1 needs to be adjusted, it is only necessary to adjust the depth of the adjusting rod 222 into the insertion hole 223. By adjusting the length of the connecting rod 22L1, the folding mechanism 2 can be adapted to different wheelchair sizes, thereby improving the practicality of the folding mechanism 2.

[0025] In this embodiment, the bottom end of the folding rod 21 is connected to the lower beam 12 through a connecting member 211. One end of the connecting member 211 is fixedly connected to the folding rod 21, and the other end is slidably mounted on the lower beam 12. Preferably, the connecting member 211 is a plastic part, which is simple in material and easy to process, and can reduce the weight of the folding mechanism 2 to a certain extent.

[0026] In this embodiment, in order to improve the balance, the folding mechanism 2 is provided with two groups, and the two groups of folding mechanisms 2 are arranged in parallel front and back. In the two groups of folding mechanisms 2, the upper ends of the folding rods 21 on the same side are connected to the same support rod 23. In this way, by connecting the upper ends of the folding rods 21 to the same support rod 23, the synchronous action of the two groups of folding structures can be achieved without the need for an additional connecting structure.

[0027] In this embodiment, pads 212 are provided at the hinges of the two groups of folding rods 21 in the folding mechanism 2, as well as at the hinges between the folding rods 21 and the connecting rods 22. One side of the pad 212 is a curved structure that adapts to the rod body of the folding rod 21, and the other side is a flat structure. The pad 212 can facilitate the mutual hinge connection between the two groups of folding rods 21 and between the connecting rod 22 and the folding rod 21, thereby improving the connection strength of the hinge point, preventing deformation due to force, and ensuring the structural stability of the folding mechanism 2.

[0028] The above contents described in this specification are merely examples of the present invention. Those skilled in the art in the technical field to which the present invention belongs may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

Claims

1. A wheelchair frame folding structure, comprising wheelchair frames (1) on both sides for overall support and a folding mechanism (2) connected between the wheelchair frames (1) on both sides, the wheelchair frames (1) on both sides comprising an upper crossbeam (11) and a lower crossbeam (12) for connecting the folding mechanism (2), the upper crossbeam (11) and the lower crossbeam (12) being parallel to each other, the folding mechanism (2) comprising two groups of folding rods (21) cross-hinged to each other, and two groups of connecting rods (22) respectively connected to the upper parts of the two groups of folding rods (21), characterized in that: The hinge points of the two groups of folding rods (21) are located in the middle of the rod body, the lower ends of the two groups of folding rods (21) are respectively hinged on the lower cross beams (12) of the left and right wheelchair frames (1), and the upper parts of the two groups of folding rods (21) are respectively connected to the upper cross beams (11) of the right and left wheelchair frames (1) through connecting rods (22), the two ends of the connecting rods (22) are respectively hinged to the upper cross beam (11) and the folding rods (21), and the connecting rods (22) include a sleeve for rotatably sleeved on the upper cross beam (11). A rod (221) and an adjusting rod (222) for being hinged on the folding rod (21), the adjusting rod (222) being adjustably inserted in the sleeve rod (221), the length of the adjusting rod (222) being L1, the distance between the upper crossbeam (11) and the lower crossbeam (12) being L2, the distance from the lower crossbeam (12) to the hinge points of the two groups of folding rods (21) being L3, the distance from the hinge points of the two groups of folding rods (21) to the hinge points between the adjusting rod (222) and the folding rod (21) being L4, and L1+L2 being equal to L3+L4.

2. The wheelchair frame folding structure according to claim 1, characterized in that: The sleeve rod (221) is provided with an insertion hole (223) for inserting the adjustment rod (222) and a fixing hole (224) communicating with the insertion hole (223); the adjustment rod (222) is provided with an adjustment groove (225) corresponding to the fixing hole (224); a sawtooth structure (226) is provided on the inner side of the adjustment groove (225); after the adjustment rod (222) is inserted into the insertion hole (223), a fastening bolt is passed through the fixing hole (224) and the adjustment groove (225) in sequence, thereby fixing the adjustment rod (222) in the sleeve rod (221).

3. The wheelchair frame folding structure according to claim 2, characterized in that: The fixing hole (224) passes through the sleeve rod (221), and the adjustment groove (225) passes through the adjustment rod (222).

4. The wheelchair frame folding structure according to claim 1, characterized in that: The bottom end of the folding rod (21) is connected to the lower cross beam (12) via a connecting piece (211); one end of the connecting piece (211) is fixedly connected to the folding rod (21), and the other end is slidably sleeved on the lower cross beam (12); the connecting piece (211) is a plastic piece.

5. The wheelchair frame folding structure according to claim 1, characterized in that: The folding mechanism (2) is provided with two groups, and the two groups of folding mechanisms (2) are arranged in parallel front and back. The upper ends of the two groups of folding rods (21) are respectively provided with support rods (23) for installing a seat. In the two groups of folding mechanisms (2), the upper ends of the folding rods (21) on the same side are connected to the same support rod (23) for synchronous operation.

6. The wheelchair frame folding structure according to claim 1, characterized in that: The hinges of the two groups of folding rods (21) and the hinges of the folding rods (21) and the connecting rods (22) are both provided with cushion blocks (212), one side of the cushion block (212) being a curved surface structure adapted to the rod body of the folding rod (21), and the other side being a flat surface structure.

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