Rotatable wheelchair seat mechanism

Abstract

The utility model belongs to wheelchair technical field especially rotatable wheelchair seat mechanism, aiming at the wheelchair in the prior art lacks effective self -locking mechanism, seat is easy to accidental rotation because of external force or vehicle body shaking after rotating to the required angle, and the poor damping effect, it is difficult to adjust the shock strength problem, present and put forward the following scheme, it includes the seat board, the bottom of seat board swing joint has the bottom plate, the bottom of bottom plate installs four symmetries and sets up the runner, four runners are equipped with same placement board, the placement board is installed with battery, angle rotating mechanism, including transmission shaft, transmission shaft rotation is installed in the bottom of seat board, transmission shaft is connected with bottom plate transmission, and the one side of seat board is connected with driving shaft rotation, driving shaft is connected with transmission shaft transmission. The utility model can be self -adaptive to the angle rotation of seat and self -locking, can also carry out damping buffer when walking, and can adjust the buffering degree, convenient for people to use.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, and in particular to a rotatable wheelchair seat mechanism. Background Technology

[0002] As an important means of transportation for people with mobility impairments, the comfort, functionality, and safety of wheelchairs directly affect the user's quality of life. Traditional wheelchairs typically have a fixed seat orientation, requiring users to move or twist their entire body when they need to communicate face-to-face with others or perform specific activities (such as approaching a table). This is not only inconvenient to operate, but also easily leads to fatigue in the user's lower back over time, and even poses a risk of tipping over.

[0003] Several rotatable wheelchair seat mechanisms have emerged in the prior art. These mechanisms typically achieve rotation by using a swivel bearing between the seat and the chassis. However, this type of solution has significant drawbacks: First, they generally lack an effective self-locking mechanism, and the seat is prone to accidental rotation due to external forces or vehicle body sway after rotating to the desired angle, posing a safety hazard. Second, the rotating mechanism often involves direct rigid contact, resulting in high frictional resistance and requiring considerable effort to operate, especially when the user's upper limb strength is insufficient. Furthermore, during wheelchair movement, particularly on uneven surfaces, continuous vibrations and impacts are generated, directly transmitted to the user, causing discomfort. Currently, common shock absorption solutions mostly use springs or shock absorbers with fixed parameters, whose shock absorption force is not adjustable, making it unable to adapt to different user weights and complex and diverse road conditions, resulting in limited shock absorption effectiveness. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing wheelchairs, such as the lack of an effective self-locking mechanism, the tendency for the seat to rotate unexpectedly due to external forces or vehicle body sway after being rotated to the desired angle, poor shock absorption, and difficulty in adjusting the shock absorption intensity. Therefore, a rotatable wheelchair seat mechanism is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A rotatable wheelchair seat mechanism includes a seat plate, the bottom of which is movably connected to a base plate. Four symmetrically arranged casters are mounted on the bottom of the base plate, and the same placement plate is provided on the four casters. A battery is mounted on the placement plate. An angle rotation mechanism includes a drive shaft, which is rotatably mounted on the bottom of a base plate and is connected to the base plate. A drive shaft is rotatably connected to one side of the base plate and is connected to the drive shaft. A handle is fixedly mounted on one end of the drive shaft. The shock absorption mechanism includes an annular buffer airbag, which is fixedly installed at the bottom of the seat plate and cooperates with the base plate.

[0006] Preferably, the angle rotation mechanism further includes a worm and a worm wheel, with the worm fixedly mounted on the drive shaft and the worm wheel fixedly mounted on the transmission shaft, the worm and the worm wheel meshing with each other.

[0007] Preferably, a limiting seat is fixedly installed on the top of the base plate, and the transmission shaft has two flat angle surfaces in the vertical direction, with the transmission shaft and the limiting seat slidingly connected vertically.

[0008] Preferably, the buffer and shock absorption mechanism further includes a pad, which is fixedly installed at the bottom of the annular buffer airbag, and a plurality of balls are rolledly connected to the top of the base plate, with the balls being rolledly connected to the pad.

[0009] Preferably, an air injection box is fixedly installed at the bottom of the seat plate, a piston plate is slidably connected to the inner wall of the air injection box, and a connecting pipe is installed on one side of the air injection box, which is connected to the annular buffer airbag.

[0010] Preferably, a threaded sleeve is rotatably connected to one side of the gas injection box, a screw is threadedly connected to the inner thread of the threaded sleeve, the screw is fixedly connected to the piston plate, and a rotating block is fixedly installed at one end of the threaded sleeve.

[0011] The beneficial effects of the rotatable wheelchair seat mechanism in this invention are as follows: The worm gear and worm wheel meshing transmission is used to achieve smooth rotation of the seat plate. At the same time, the self-locking characteristics of the worm gear and worm wheel are used to prevent the seat plate from rotating unexpectedly without external force, thus improving safety and stability. The transmission shaft is designed with a double flat-angle surface structure and slides with the limit seat, which allows vertical movement while restricting lateral displacement, ensuring precise guidance and structural rigidity during rotation. An annular airbag is installed between the seat plate and the floor plate. The air is compressed to achieve cushioning and shock absorption, adapting to different road conditions and improving riding comfort. The air pressure inside the airbag can be manually adjusted through the air box, piston plate and threaded transmission mechanism (threaded sleeve and screw). Users can customize the cushioning force according to their weight or road conditions to enhance adaptability.

[0012] This invention can adaptively rotate and lock the seat, while also providing shock absorption and cushioning during walking, and can adjust the cushioning force for convenient use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the rotatable wheelchair seat mechanism proposed in this utility model; Figure 2 This is a top view schematic diagram of the base plate and annular buffer airbag of the rotatable wheelchair seat mechanism proposed in this utility model. Figure 3 This is a schematic diagram of part A of the rotatable wheelchair seat mechanism proposed in this utility model; Figure 4This is a schematic diagram of part B of the rotatable wheelchair seat mechanism proposed in this utility model.

[0014] In the diagram: 1. Seat plate; 2. Base plate; 3. Battery; 4. Annular buffer airbag; 5. Pad plate; 6. Air injection box; 7. Connecting pipe; 8. Piston plate; 9. Threaded sleeve; 10. Screw; 11. Rotary block; 12. Drive shaft; 13. Limit seat; 14. Drive shaft; 15. Worm gear; 16. Worm wheel; 17. Handle. Detailed Implementation

[0015] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments. Example

[0016] The following is combined Figures 1-4 This application will be described in further detail.

[0017] A rotatable wheelchair seat mechanism includes a seat plate 1, a base plate 2 movably connected to the bottom of the seat plate 1, four symmetrically arranged swivel wheels 18 installed on the bottom of the base plate 2, the same placement plate 19 on the four swivel wheels 18, and a battery 3 installed on the placement plate 19. An angle rotation mechanism includes a drive shaft 12, which is rotatably mounted on the bottom of a base plate 1 and is connected to a base plate 2. A drive shaft 14 is rotatably connected to one side of the base plate 1 and is connected to the drive shaft 12. A handle 17 is fixedly mounted on one end of the drive shaft 14. The shock absorption mechanism includes an annular buffer airbag 4, which is fixedly installed at the bottom of the seat plate 1 and cooperates with the base plate 2.

[0018] Reference Figure 1 In this embodiment, the angle rotation mechanism also includes a worm 15 and a worm wheel 16. The worm 15 is fixedly installed on the drive shaft 14, and the worm wheel 16 is fixedly installed on the transmission shaft 12. The worm 15 and the worm wheel 16 mesh with each other. A limit seat 13 is fixedly installed on the top of the base plate 2. The transmission shaft 12 has two flat angle surfaces in its vertical direction. The transmission shaft 12 and the limit seat 13 are slidably connected vertically. The limit seat 13 is slidably connected vertically with the transmission shaft 12, so that the transmission shaft 12 and the limit seat 13 can only move vertically. The two flat angle surfaces of the transmission shaft 12 provide lateral limitation between the limit seat 13 and the limit seat 13. At the same time, the rotating drive shaft 14 can rotate vertically between the drive shaft 14 and the base plate 2 through the meshing of the worm 15 and the worm wheel 16, thereby driving the seat plate 1 to rotate. At the same time, the meshing of the worm 15 and the worm wheel 16 can self-lock the seat plate 1 and the base plate 2.

[0019] Reference Figure 1 In this embodiment, the buffer and shock absorption mechanism also includes a pad 5. The pad 5 is fixedly installed at the bottom of the annular buffer airbag 4, and multiple balls are rolledly connected to the top of the base plate 2. The balls are rolledly connected to the pad 5. The pad 5 can isolate the annular buffer airbag 4 from the base plate 2 and protect the annular buffer airbag 4. At the same time, the rolling connection between the balls and the pad 5 can reduce the friction when the pad 5 rotates.

[0020] Reference Figure 1 In this embodiment, an air injection box 6 is fixedly installed at the bottom of the seat plate 1. A piston plate 8 is slidably connected to the inner wall of the air injection box 6. A connecting pipe 7 is installed on one side of the air injection box 6 and is connected to the annular buffer airbag 4. A threaded sleeve 9 is rotatably connected to one side of the air injection box 6. A screw 10 is threadedly connected to the inner thread of the threaded sleeve 9. The screw 10 is fixedly connected to the piston plate 8, and a rotating block 11 is fixedly installed at one end of the threaded sleeve 9. The gas in the air injection box 6 can block the annular buffer airbag 4 to release and absorb gas, thereby adjusting the air pressure in the annular buffer airbag 4 to adapt to different buffering forces. When adjustment is required, the rotating block 11 is rotated, and the rotating block 11 drives the threaded sleeve 9 to rotate. The threaded sleeve 9 is threadedly connected to the screw 10, thereby driving the screw 10 to move, which in turn drives the piston plate 8 to squeeze the gas in the air injection box 6, thereby adjusting the air pressure in the annular buffer airbag 4.

[0021] Working principle: When the angle of the seat plate 1 on the wheelchair needs to be adjusted, the handle 17 is turned, which drives the drive shaft 14 to rotate. The rotating drive shaft 14, through the meshing of the worm gear 15 and the worm wheel 16, can drive the drive shaft 14 and the base plate 2 to rotate at an angle, thereby driving the seat plate 1 to rotate. At the same time, the meshing of the worm gear 15 and the worm wheel 16 can self-lock between the seat plate 1 and the base plate 2. The gas in the air injection box 6 can block the annular buffer airbag 4 to release and release gas, thereby adjusting the air pressure in the annular buffer airbag 4 to adapt to different cushioning forces. When adjustment is needed, the rotating block 11 is turned, which drives the threaded sleeve 9 to rotate. The threaded sleeve 9 is connected to the screw 10 by threads, thereby driving the screw 10 to move, which in turn drives the piston plate 8 to compress the gas in the air injection box 6, thereby adjusting the air pressure in the annular buffer airbag 4. The battery 3 can provide power to the four wheels 18, which facilitates the movement of the wheelchair. Example

[0022] The rest of Embodiment 2 is the same as Embodiment 1, except that the bottom of the base plate 2 is provided with a lifting mechanism. The lifting mechanism can adjust the height of the seat plate 1, thereby adjusting the center of gravity of the device, making it more stable when climbing stairs or going uphill. All structural shapes, sizes and materials of Embodiment 1 are included in this application. In order to meet specific usage, they can be selected and adjusted. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted appropriately.

[0023] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A rotatable wheelchair seat mechanism, comprising a seat plate (1), characterized in that, The bottom of the seat plate (1) is movably connected to the base plate (2), and four symmetrically arranged rotating wheels (18) are installed on the bottom of the base plate (2). The four rotating wheels (18) are provided with the same placement plate (19), and the placement plate (19) is equipped with a storage battery (3). Angle rotation mechanism includes a drive shaft (12), which is rotatably mounted on the bottom of the seat plate (1). The drive shaft (12) is connected to the base plate (2) in a drive connection. A drive shaft (14) is rotatably connected to one side of the seat plate (1). The drive shaft (14) is connected to the drive shaft (12) in a drive connection. A handle (17) is fixedly mounted on one end of the drive shaft (14). The shock absorption mechanism includes an annular buffer airbag (4), which is fixedly installed at the bottom of the seat plate (1) and the annular buffer airbag (4) cooperates with the base plate (2).

2. The rotatable wheelchair seat mechanism according to claim 1, characterized in that, The angle rotation mechanism also includes a worm (15) and a worm wheel (16). The worm (15) is fixedly installed on the drive shaft (14), and the worm wheel (16) is fixedly installed on the transmission shaft (12). The worm (15) and the worm wheel (16) mesh with each other.

3. The rotatable wheelchair seat mechanism according to claim 2, characterized in that, The bottom plate (2) is fixedly installed with a limiting seat (13), and the transmission shaft (12) has two flat angle surfaces in the vertical direction. The transmission shaft (12) and the limiting seat (13) are slidably connected up and down.

4. The rotatable wheelchair seat mechanism according to claim 1, characterized in that, The buffer and shock absorption mechanism also includes a pad (5), which is fixedly installed at the bottom of the annular buffer airbag (4), and multiple balls are rolledly connected to the top of the base plate (2), with the balls being rolledly connected to the pad (5).

5. The rotatable wheelchair seat mechanism according to claim 4, characterized in that, An air injection box (6) is fixedly installed at the bottom of the seat plate (1). A piston plate (8) is slidably connected to the inner wall of the air injection box (6). A connecting pipe (7) is installed on one side of the air injection box (6). The connecting pipe (7) is connected to the annular buffer airbag (4).

6. The rotatable wheelchair seat mechanism according to claim 5, characterized in that, A threaded sleeve (9) is rotatably connected to one side of the gas injection box (6), and a screw (10) is threadedly connected to the inside of the threaded sleeve (9). The screw (10) is fixedly connected to the piston plate (8), and a rotating block (11) is fixedly installed at one end of the threaded sleeve (9).

Images