Electrically powered wheelchair universal traction device

Abstract

The utility model provides electric wheelchair omnipotent tractor relates to medical instrument technical field, including center shaft, the length direction of center shaft is in the middle and is equipped with two first fixed parts, one side of two first fixed parts is rotatably connected with first rotator, one side of first rotator is fixedly connected with the spherical shell, one side of spherical shell is provided with the main shaft, one end of main shaft away from this spherical shell is provided with another spherical shell, one side of another spherical shell is fixedly connected with second rotator, one side of second rotator is provided with two second fixed parts, both ends of main shaft are fixedly connected with the ball cage, set up a plurality of steel ball through the ball cage surface of both ends of main shaft, set up the raceway on the inner wall of spherical shell again, utilize the positioning rolling fit of steel ball and raceway, realize the flexibility of the sleeve joint between ball cage and spherical shell, and then reduce the radius of turning of rear wheelchair when current side wheelchair turns, improve the adaptability of tractor when moving on complex road surface.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a universal traction device for electric wheelchairs. Background Technology

[0002] With the increasing aging of the global population and the growing demand for independent mobility among people with disabilities, electric wheelchairs have become an important assistive mobility tool. An electric wheelchair is an electric-powered assistive device designed specifically for people with mobility impairments. It achieves autonomous movement through components such as motors, batteries, and controllers, and features labor-saving, flexibility, and stable battery life. It is an important component of modern rehabilitation assistive devices.

[0003] In real life, there are many scenarios where two people need to travel together, such as elderly couples who are both unable to move around easily, or disabled people who need to be accompanied by caregivers. Ordinary single electric wheelchairs cannot meet the needs of two people traveling at the same time. Moreover, when two people with mobility impairments travel together, it may be necessary to equip them with two single electric wheelchairs. This not only increases the cost, but also requires two people to operate them separately during the trip, making it difficult to ensure consistency of movement. It also makes it more difficult to pass through narrow passages or complex road conditions.

[0004] However, most existing double electric wheelchairs are one-piece designs with a fixed structure between the front and rear seats. The one-piece long wheelbase design can easily lead to a large turning radius, making it difficult to complete steering operations indoors. The rigid connection method cannot adapt to the relative movement on complex road surfaces, and the connection operation is cumbersome and requires tool assistance, making it unsuitable for the elderly or caregivers to complete independently. Utility Model Content

[0005] The purpose of this utility model is to solve the problem that the rigid fixed connection between the front and rear seats of a two-person electric wheelchair results in an excessively large turning radius between the front and rear wheelchairs, making it difficult to operate and poorly adaptable to complex road surfaces. Therefore, a universal traction device for electric wheelchairs is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a universal electric wheelchair traction device, comprising a central shaft, two first fixing members centrally mounted along the length of the central shaft, a first rotating member rotatably connected to one side of the two first fixing members, a spherical shell fixedly connected to one side of the first rotating member, a main shaft provided on one side of the spherical shell, another spherical shell provided at the end of the main shaft away from the first spherical shell, a second rotating member fixedly connected to one side of the other spherical shell, and two second fixing members provided on one side of the second rotating member; ball cages fixedly connected to both ends of the main shaft, the ball cages and the spherical shells respectively fitted together, a plurality of steel balls provided on the surface of the ball cages, and a raceway provided on the inner wall of the spherical shells, the ball cages and the spherical shells being positioned and rolled together by the steel balls and the raceway.

[0007] Preferably, a first connecting bolt is inserted into the side of the first fixing member away from the central axis, and the first connecting bolt passes through the first rotating member laterally to the left and right, and the first connecting bolt and the first rotating member are rotatably connected.

[0008] Preferably, each of the two second fixing members has a connecting hole, and a quick-connect pin is inserted into the connecting hole. The quick-connect pin passes through the second rotating member vertically, and the second rotating member and the quick-connect pin are rotatably connected.

[0009] Preferably, the two second fasteners are fixedly connected by a second connecting bolt, and a mating hole is provided on the side of the second fastener away from the connecting hole.

[0010] Preferably, both ends of the central shaft are fixedly connected to screw-in ends, and the end of the screw-in end away from the central shaft is threadedly connected to a nut end.

[0011] Preferably, a kit is fixedly connected to one side of the nut end, and a stud is fitted onto the bottom of the kit.

[0012] Preferably, a fixing block is fixedly connected to the bottom of the stud, and a fixing bolt is threadedly connected to the top of the stud.

[0013] Preferably, a polygonal baffle is fixedly connected to the top of the fixing bolt, the diameter of the polygonal baffle being larger than the diameter of the kit, and two first bolts are threadedly connected to the top of the fixing block.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0015] 1. In this utility model, multiple steel balls are set on the surface of the ball cage at both ends of the main shaft, and a raceway is set on the inner wall of the ball shell. The steel balls and the raceway are used for positioning and rolling cooperation, which realizes the flexibility of the connection between the ball cage and the ball shell, thereby reducing the turning radius of the rear wheelchair when the front wheelchair turns, and improving the adaptability of the traction device to movement on complex road surfaces.

[0016] 2. In this utility model, by utilizing the fact that the rotation direction between the first connecting bolt and the first rotating component is different from the rotation direction between the second rotating component and the quick-release pin, the flexibility of the front wheelchair driving the rear wheelchair to turn and move in complex environments is further improved. At the same time, the convenience of the quick-release pin reduces the cumbersomeness of the connection operation between the front and rear wheelchairs, making it easier for the elderly to use. Attached Figure Description

[0017] Figure 1 This utility model presents a three-dimensional structural separation diagram of a universal traction device for electric wheelchairs;

[0018] Figure 2This utility model provides a three-dimensional structural schematic diagram of a universal traction device for electric wheelchairs;

[0019] Figure 3 A three-dimensional installation structure diagram of the universal electric wheelchair traction device proposed in this utility model is shown.

[0020] Legend: 1. Main shaft; 2. Ball cage; 3. Ball shell; 4. First rotating component; 5. Second rotating component; 6. First connecting bolt; 7. First fixing component; 8. Central shaft; 9. Screw-in end; 10. Nut end; 11. Fixing block; 12. Kit; 13. Stud; 14. Bolt; 15. Fixing bolt; 16. Quick-connect pin; 17. Second connecting bolt; 18. Second fixing component; 19. Butt hole; 20. Connecting hole. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1: As Figures 1-3 As shown, this utility model provides a technical solution: a universal traction device for electric wheelchairs, including a central shaft 8, characterized in that: two first fixing members 7 are centrally mounted on the length direction of the central shaft 8, a first rotating member 4 is rotatably connected to one side of the two first fixing members 7, a spherical shell 3 is fixedly connected to one side of the first rotating member 4, a main shaft 1 is provided on one side of the spherical shell 3, another spherical shell 3 is provided at the end of the main shaft 1 away from the first spherical shell 3, a second rotating member 5 is fixedly connected to one side of the other spherical shell 3, and two second fixing members 18 are provided on one side of the second rotating member 5; ball cages 2 are fixedly connected to both ends of the main shaft 1, the ball cages 2 and the spherical shells 3 are respectively fitted together, a plurality of steel balls are provided on the surface of the ball cages 2, and a raceway is provided on the inner wall of the spherical shells 3, and the ball cages 2 and the spherical shells 3 are positioned and rolled together by the steel balls and the raceway.

[0024] In this embodiment, when the wheelchair in front of the traction device turns, it drives the central shaft 8 to move. The movement of the central shaft 8 drives the two first fixed members 7 to move, and the movement of the two first fixed members 7 drives the first rotating member 4 to move. The first rotating member 4 is fixedly connected to a spherical shell 3 at one end near the central shaft 8. A ball cage 2 is sleeved inside the spherical shell 3. The movement of the first rotating member 4 drives the spherical shell 3 and the ball cage 2 to move. However, since the inner wall of the spherical shell 3 is provided with a raceway and the surface of the ball cage 2 is provided with multiple steel balls, the steel balls and the raceway are positioned and rolled together. Therefore, the deflection of the ball cage 2 and the spherical shell 3 can adjust the direction of travel, reduce the turning radius of the wheelchair behind when the wheelchair in front turns, realize the flexibility of the sleeve between the ball cage 2 and the spherical shell 3, improve the adaptability of the traction device when moving on complex road surfaces, reduce the stress during travel, and improve the reliability of the structure.

[0025] Example 2: As Figures 1-3 As shown, a first connecting bolt 6 is inserted into the side of the first fixing member 7 away from the central axis 8. The first connecting bolt 6 passes horizontally through the first rotating member 4, and the first connecting bolt 6 and the first rotating member 4 are rotatably connected. Each of the two second fixing members 18 has a connecting hole 20, and a quick-release pin 16 is inserted into the connecting hole 20. The quick-release pin 16 passes vertically through the second rotating member 5, and the second rotating member 5 and the quick-release pin 16 are rotatably connected. The two second fixing members 18 are fixedly connected by a second connecting bolt 17. A connecting bolt 6 is inserted into the side of the second fixing member 18 away from the connecting hole 20. The device has a mating hole 19. Both ends of the central shaft 8 are fixedly connected to screw-in ends 9. The end of the screw-in end 9 away from the central shaft 8 is threadedly connected to a nut end 10. A kit 12 is fixedly connected to one side of the nut end 10. A stud 13 is fitted at the bottom of the kit 12. A fixing block 11 is fixedly connected to the bottom of the stud 13. A fixing bolt 15 is threadedly connected to the top of the stud 13. A polygonal baffle is fixedly connected to the top of the fixing bolt 15. The diameter of the polygonal baffle is larger than the diameter of the kit 12. Two first bolts 14 are threadedly connected to the top of the fixing block 11.

[0026] In this embodiment, by utilizing the fact that the rotation direction between the first connecting bolt 6 and the first rotating member 4 is different from the rotation direction between the second rotating member 5 and the quick-release pin 16, the steering amplitude of the front wheelchair driving the rear wheelchair in complex environments is further reduced, thereby improving the flexibility of movement.

[0027] Furthermore, by rotating the second connecting bolt 17 through the pre-reserved docking hole 19, the two second fixing parts 18 are opened, making it convenient for the docking hole 19 of the traction device to connect to the footrest of the rear wheelchair. The connecting hole 20 facilitates the quick-connect pin 16 to be aligned and connected to the second fixing part 18 and the second rotating part 5. At the same time, the convenience of the quick-connect pin 16 reduces the complexity of the connection operation between the front and rear wheelchairs, making it easier for the elderly to use. In addition to being rotatably connected to the first rotating part 4, the first connecting bolt 6 also serves to connect and fix the two first fixing parts 7. Rotating the screw-in end 9 into the nut end 10 improves the convenience of disassembly and assembly of the traction device. The bolt 14 facilitates the connection of the fixing block 11 to the front wheelchair. The kit 12 drives the central shaft 8 to be positioned on the stud 13 of the fixing block 11. Then, the fixing bolt 15 is screwed into the stud 13. Since the diameter of the polygonal baffle at the top of the fixing bolt 15 is larger than the diameter of the kit 12, the stability of the connection between the central shaft 8 and the connecting block is improved.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A universal traction device for electric wheelchairs, including a central shaft (8), characterized in that: Two first fixing members (7) are centrally mounted on the length direction of the central shaft (8). A first rotating member (4) is rotatably connected to one side of the two first fixing members (7). A spherical shell (3) is fixedly connected to one side of the first rotating member (4). A main shaft (1) is provided on one side of the spherical shell (3). Another spherical shell (3) is provided at the end of the main shaft (1) away from this spherical shell (3). A second rotating member (5) is fixedly connected to one side of the other spherical shell (3). Two second fixing members (18) are provided on one side of the second rotating member (5). Both ends of the main shaft (1) are fixedly connected to a ball cage (2). The ball cage (2) and the ball shell (3) are respectively sleeved. The surface of the ball cage (2) is provided with a plurality of steel balls. The inner wall of the ball shell (3) is provided with a raceway. The ball cage (2) and the ball shell (3) are positioned and rolled together by the steel balls and the raceway.

2. The universal traction device for electric wheelchairs according to claim 1, characterized in that: The first fixing member (7) is connected to a first connecting bolt (6) on the side away from the central axis (8). The first connecting bolt (6) passes through the first rotating member (4) laterally. The first connecting bolt (6) and the first rotating member (4) are rotatably connected.

3. The universal traction device for electric wheelchairs according to claim 1, characterized in that: Both of the second fixing members (18) are provided with connecting holes (20), and quick-connect pins (16) are inserted into the connecting holes (20). The quick-connect pins (16) penetrate the second rotating member (5) vertically, and the second rotating member (5) and the quick-connect pins (16) are rotatably connected.

4. The universal electric wheelchair traction device according to claim 3, characterized in that: The two second fasteners (18) are fixedly connected by the second connecting bolts (17), and the second fasteners (18) have a mating hole (19) on the side away from the connecting hole (20).

5. The universal traction device for electric wheelchairs according to claim 1, characterized in that: Both ends of the central shaft (8) are fixedly connected to screw-in ends (9), and the end of the screw-in end (9) away from the central shaft (8) is threadedly connected to a nut end (10).

6. The universal traction device for electric wheelchairs according to claim 5, characterized in that: A kit (12) is fixedly connected to one side of the nut end (10), and a stud (13) is fitted on the bottom of the kit (12).

7. The universal electric wheelchair traction device according to claim 6, characterized in that: The bottom of the stud (13) is fixedly connected to a fixing block (11), and the top of the stud (13) is threadedly connected to a fixing bolt (15).

8. The universal traction device for electric wheelchairs according to claim 7, characterized in that: The top of the fixing bolt (15) is fixedly connected to a polygonal baffle, the diameter of which is larger than the diameter of the kit (12), and the top of the fixing block (11) is threadedly connected to two first bolts (14).

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