Intelligent Assistive Wheelchair

Abstract

This invention discloses an intelligent assistive wheelchair, comprising a support frame body with a movable linkage frame mounted on it. A seat cushion and backrest are mounted on the movable linkage frame. Drive wheels, brakes, and drive motors are located on both sides of the support frame body. Two rear wheels are located at the rear bottom of the support frame body, and two retractable front wheels are located at the front bottom of the support frame body. The drive motor includes a motor body and a motor output shaft. The motor body is mounted on the bottom of the movable linkage frame, and the motor output shaft is rotatably mounted on the support frame body with its end connected to the drive wheel shaft. When the brakes stop the drive wheels, the drive motor can drive the movable linkage frame to switch between raised and lowered states through the rotation of the motor body. This invention assists users in sitting down and standing up, and also allows for adjustable footrest height, making it more convenient and comfortable. Furthermore, its simple and stable structural design and low manufacturing cost make it suitable for most consumers.

Description

Technical Field

[0001] This invention relates to the field of wheelchair technology, and in particular to an intelligent assistive wheelchair. Background Technology

[0002] In today's society, our economy and technology are developing rapidly, meeting people's various needs, especially for the elderly or people with mobility difficulties, smart wheelchairs have become their assistance.

[0003] However, most smart wheelchairs currently available lack the ability to assist users in sitting or standing up, and the footrests cannot be adjusted to a suitable height, making them inconvenient for people with special needs. Furthermore, when people first sit down, their center of gravity is unstable, and they may tip backward along with the wheelchair, posing a safety hazard. Of course, a few smart wheelchairs can assist with sitting and standing, but these wheelchairs have complex designs and high manufacturing costs, making them generally expensive and unaffordable for most people. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an intelligent assistive wheelchair that can assist people in sitting down and getting up, while having a simple and stable structural design and low manufacturing cost.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] An intelligent assistive wheelchair includes a support frame body, on which a movable linkage frame is mounted, and on which a seat cushion and backrest are installed. Both sides of the support frame body are provided with drive wheels, brakes and drive motors. Two rear wheels are provided at the rear bottom of the support frame body, and two front wheels are retractably provided at the front bottom of the support frame body.

[0007] The drive motor includes a motor body and a motor output shaft. The motor body is installed at the bottom of the movable linkage frame, and the motor output shaft is rotatably installed on the support frame body and its end is connected to the drive wheel shaft.

[0008] The movable linkage has two states: raised and lowered. When the drive motor is not braking, it can drive the drive wheel to rotate. When the drive wheel is stopped by the brake, the drive motor can drive the movable linkage to switch between the two states of raised and lowered by rotating the motor body. At the same time, when the state is switched, the movable linkage can drive the two front wheels to extend and retract.

[0009] Furthermore, the movable linkage frame includes a backrest frame, two drive rods rotatably mounted on both sides of the bottom end of the backrest frame, and two driven rods rotatably mounted on both sides of the middle part of the backrest frame. The ends of the two drive rods away from the backrest frame are fixed to the corresponding motor bodies, and the ends of the two driven rods away from the backrest frame are rotatably connected to both sides of the support frame body.

[0010] The backrest is mounted on the backrest frame, and the seat cushion is mounted between two driven rods. The drive rod can rotate up and down under the drive of the motor body, thereby driving the backrest frame and the driven rods to move up and down, so that the backrest and seat cushion can be raised and lowered.

[0011] Furthermore, a first rotating shaft is provided at the bottom of the backrest frame, and two driving rods are rotatably connected to the two ends of the first rotating shaft. A second rotating shaft is provided in the middle of the backrest frame, and two driven rods are rotatably connected to the two ends of the second rotating shaft. Short shafts are provided on both sides of the top of the support frame body, and the ends of the two driven rods away from the backrest frame are rotatably connected to the corresponding short shafts.

[0012] Furthermore, a limiting support rod is provided at the rear bottom of the support frame body, and the drive rod is limited by the limiting support rod after being lowered.

[0013] Furthermore, the movable linkage frame has connecting rods rotatably connected to both sides of its bottom, and front wheel brackets for mounting the front wheels are slidably inserted into both sides of the front end of the support frame body. The end of the connecting rod away from the movable linkage frame is rotatably mounted on the corresponding front wheel bracket.

[0014] During the process of raising and lowering the movable linkage, the two front wheel linkages can be pushed forward and extended through two linkages.

[0015] Furthermore, an extension column is formed on the side of the front wheel frame, the extension column is slidably engaged with the support frame body, and the end of the connecting rod away from the movable connecting rod frame is rotatably connected to the extension column.

[0016] Furthermore, handrails are rotatably mounted on both sides of the movable linkage frame, and limiting seats for positioning the handrails are fixed thereon.

[0017] Furthermore, two push handles are also provided on the rear side of the movable linkage frame.

[0018] Furthermore, a pedal mechanism is also provided at the front of the main body of the support frame.

[0019] Furthermore, a crossbeam is provided on the upper part of the support frame body, and the pedal mechanism includes an electric push rod and a guide rail mounted on the crossbeam. The telescopic end of the electric push rod faces downward, the guide rail is arranged vertically and a slider is slidably connected on the guide rail, a foot plate is installed on the front side of the slider, and the telescopic end of the electric push rod is connected to the foot plate.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects:

[0021] 1. This invention achieves both driving and assisted sitting functions using only two drive motors on both sides as the power system. Specifically, it utilizes two components: the motor body and the motor output shaft. The motor body is fixed on a movable linkage frame, and the motor output shaft is connected to the drive wheel. Simultaneously, a brake is used to stop and release the drive wheel, thus enabling the drive motor to function as both a power system and a driver. This simplifies the overall design, reduces manufacturing costs, and makes it more affordable, suitable for most consumers.

[0022] 2. This invention, through the cooperation of a movable linkage frame, drive wheel, brake, and drive motor, enables the movable linkage frame to switch between two states: raised and lowered. This allows the backrest and seat cushion to be raised and lowered, thus assisting people in getting up and sitting down, making it more convenient and beneficial to the public.

[0023] 3. This invention designs the front wheel to be retractable and movable. Specifically, the front wheel frame is slidably connected to the main support frame, and a linkage is used to link the front wheel frame and the movable linkage frame. When the movable linkage frame is lowered, it can simultaneously drive the front wheel frame forward, thereby moving the front wheel forward. This allows the front and rear wheels of the wheelchair to have a wider load-bearing area, and the overall center of gravity of the wheelchair can be shifted forward. This makes the wheelchair more stable when people sit down, avoiding accidents of tipping backward, improving safety performance. At the same time, the structural design is simple and the manufacturing cost is low.

[0024] 4. This invention allows people to easily raise their feet using a pedal mechanism. Through the cooperation of an electric push rod, guide rail, slider, and footboard, the lifting height of the footboard can be adjusted according to individual differences, making it more convenient and comfortable. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the seat cushion of the present invention when it is raised;

[0026] Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle;

[0027] Figure 3 for Figure 1 Schematic diagram of the back side of the middle structure;

[0028] Figure 4 This is a partial structural diagram of the lower half of the present invention;

[0029] Figure 5 for Figure 4 Enlarged structural diagram of section B in the middle;

[0030] Figure 6 for Figure 4 Front view of the central structure;

[0031] Figure 7 This is a schematic diagram of the movable linkage frame of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the seat cushion of the present invention when it is lowered;

[0033] The components include: 1. Support frame body; 2. Movable linkage frame; 20. Backrest frame; 21. First rotating shaft; 22. Second rotating shaft; 23. Drive rod; 24. Driven rod; 25. Short shaft; 3. Seat cushion; 4. Backrest; 5. Drive wheel; 6. Brake; 7. Drive motor; 70. Motor body; 71. Motor output shaft; 8. Pedal mechanism; 80. Guide rail; 81. Slider; 82. Footboard; 83. Electric push rod; 9. Rear wheel; 10. Front wheel; 11. Front wheel frame; 110. Extension column; 12. Connecting rod; 13. Limiting support rod; 14. Crossbeam; 15. Armrest; 16. Limiting seat; 17. Push handle. Detailed Implementation

[0034] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] like Figure 1-8As shown in this embodiment, an intelligent assistive wheelchair is provided, which mainly consists of a support frame body 1, a movable linkage frame 2, a seat cushion 3, a backrest 4, two drive wheels 5, two brakes 6, two drive motors 7, two rear wheels 9, and two front wheels 10. The movable linkage frame 2 is assembled on the support frame body 1, and the seat cushion 3 and backrest 4 are mounted on the movable linkage frame 2. The movable linkage frame 2 can switch between two states: raised and lowered. Specifically, in the raised state, no one is using the wheelchair and both the seat cushion 3 and backrest 4 are upright; in the lowered state, both the seat cushion 3 and backrest 4 are lowered for use. The two drive wheels 5 and two brakes 6 are located on both sides of the support frame body 1. The two drive motors 7 are located on the inner sides of the support frame body 1 and mounted on the bottom of the movable linkage frame 2. The two rear wheels 9 are located at the rear bottom of the support frame body 1, and the two front wheels 10 are retractably located at the front bottom of the support frame body 1. Specifically, the drive motor 7 consists of a motor body 70 and a motor output shaft 71. The motor body 70 is fixedly mounted on the bottom of the movable linkage 2, and the motor output shaft 71 is rotatably mounted on the support frame body 1 with its end connected to the axis of the drive wheel 5. This allows for driving and assisting in sitting up using only the two drive motors 7 on both sides as the power system, simplifying the overall design, reducing manufacturing costs, and making it more affordable for most consumers. When the brake 6 is not applying pressure to the drive wheel 5, the drive motor 7 can normally drive the drive wheel 5 by rotating its output shaft 71. That is, when the drive motor 7 drives the output shaft 71 to rotate forward, the wheelchair moves forward; conversely, it moves backward. When the brake 6 stops the drive wheel 5, it effectively restricts the motor output shaft 71, allowing the drive motor 7 to drive the movable linkage 2 to achieve both raising and lowering states through the rotation of the motor body 70. The switching mechanism involves the drive motor 7 driving the output shaft 71 to rotate forward, which in turn drives the motor body 70 to rotate in reverse, thereby driving the movable linkage 2 to lower. Conversely, the movable linkage 2 is raised when the motor body 70 rotates forward. At the same time, the movable linkage 2 can also extend and retract the two front wheels 10 in conjunction with the state switching. That is, when the motor body 70 rotates in reverse to drive the movable linkage 2 to lower, it can drive the front wheels 10 to move forward and extend. Conversely, the front wheels 10 move backward and retract. This allows the front and rear wheels of the wheelchair to have a wider load-bearing area, and the overall center of gravity of the wheelchair can be shifted forward, making the wheelchair more stable when people sit down, avoiding accidents of tipping backward, improving safety performance, and also having a simple structural design and low manufacturing cost.

[0036] Specifically, the movable linkage 2 in this embodiment is designed as follows: it mainly consists of a backrest frame 20, two drive rods 23, two driven rods 24, a first rotating shaft 21, and a second rotating shaft 22. The backrest 4 is mounted on the backrest frame 20, and the seat cushion 3 is mounted between the two driven rods 24. The first rotating shaft 21 is located at the bottom of the backrest frame 20, and the two drive rods 23 are rotatably connected to both ends of the first rotating shaft 21. The second rotating shaft 22 is located in the middle of the backrest frame 20, and the two driven rods 24 are rotatably connected to both ends of the second rotating shaft 22. Simultaneously, the ends of the two drive rods 23 away from the backrest frame 20 are respectively fixed to two motor bodies 70, and the motor output shaft 71 passes through the drive rods 23 and is rotatably mounted on the support frame body 1. Furthermore, short shafts 25 are provided on both sides of the top of the support frame body 1, and the ends of the two driven rods 24 away from the backrest frame 20 are rotatably connected to the two short shafts 25. With this design, when the motor body 70 rotates in reverse, the drive rod 23 will also rotate in reverse and lower, thereby driving the backrest frame 20 and backrest 4 to lower, and driving the driven rod 24 and seat cushion 3 to rotate in reverse and lower as well; conversely, when the motor body 70 rotates in the forward direction, the drive rod 23 will also rotate in the forward direction and lift, thereby driving the backrest frame 20 and backrest 4 to lift, and driving the driven rod 24 and seat cushion 3 to rotate in the forward direction and lift as well.

[0037] When a person sits down, in order to provide better support and better reaction force when the motor output shaft 71 rotates, a limiting support rod 13 is horizontally welded at the rear bottom of the support frame body 1 in this embodiment. When the drive rod 23 is lowered, it can be supported and limited by the limiting support rod 13, so as to provide better support for the seat cushion 3, making the overall structure more stable. At the same time, it restricts the rotation of the motor body 70, and the motor output shaft 71 can better drive the drive wheel 5 to rotate forward. Of course, after a person sits down, their own weight will also restrict the rotation of the motor body 70, so that the motor output shaft 71 can better drive the drive wheel 5 to rotate backward.

[0038] Specifically, in this embodiment, the movable linkage 2 drives the two front wheels 10 to extend and retract in the following way: A connecting rod 12 is rotatably connected to the bottom of each of the two drive rods 23. Front wheel brackets 11 for mounting the front wheels 10 are slidably inserted into both sides of the front end of the support frame body 1. Simultaneously, the end of the connecting rod 12 away from the drive rod 23 is rotatably mounted on the front wheel bracket 11. Thus, when the movable linkage 2 is lowered, i.e., when the two drive rods 23 are lowered in reverse, the two connecting rods 12 can push the two front wheel brackets 11 forward and extend, thereby causing the two front wheels 10 to extend forward, achieving a stable overall effect, and vice versa. Furthermore, to make the sliding of the front wheel brackets 11 more stable, an extension post 110 is formed on the side of the front wheel bracket 11. The extension post 110 is slidably engaged with the support frame body 1, and the end of the connecting rod 12 away from the drive rod 23 is rotatably connected to the extension post 110.

[0039] To facilitate foot elevation when using a wheelchair, this embodiment also includes a pedal mechanism 8 at the front of the support frame body 1. Specifically, the pedal mechanism 8 consists of an electric push rod 83, two guide rails 80, and a footrest 82. A crossbeam 14 is welded to the upper part of the support frame body 1. The electric push rod 83 and the two guide rails 80 are fixedly mounted on the crossbeam 14. The telescopic end of the electric push rod 83 faces downwards. The guide rails 80 are arranged vertically, and sliders 81 are slidably connected to both guide rails 80. The back of the footrest 82 is mounted on the sliders 81, and the telescopic end of the electric push rod 83 is connected to the footrest 82. The electric push rod 83 drives the footrest 82 to move up and down to achieve lifting and lowering, thus adjusting the lifting height of the footrest 82 according to individual differences, making it more comfortable and convenient for the user.

[0040] To facilitate user grip, armrests 15 are rotatably installed on both sides of the backrest frame 20 in this embodiment. Limiting seats 16 are also fixed on both sides of the backrest frame 20 below the armrests 15. After the armrests 15 are rotated down, they can be positioned and stabilized by the limiting seats 16.

[0041] To facilitate manual pushing of the wheelchair, two push handles 17 are also provided on the rear side of the backrest frame 20 in this embodiment.

[0042] In this embodiment, when not in use, the movable linkage 2, seat cushion 3, and backrest 4 are all raised. The drive motor 7 can control the drive wheel 5 to rotate, thereby driving the wheelchair to move automatically, making it convenient to move to a designated location and place, saving the need for manual pushing. When an elderly person or someone with mobility issues needs to use the wheelchair, the brake 6 first stops the drive wheel 5; then, the electric push rod 83 lowers the footrest 82; the person can then step onto the footrest, lean against the wheelchair, with their back and buttocks against the backrest 4 and seat cushion 3; the drive motor 7 controls the motor output shaft 71 to rotate in the reverse direction, which in turn drives the movable linkage 2 to slowly lower until it is supported by the limit support rod 13, allowing the seat cushion 3 and backrest 4 to slowly lower as well, thus assisting the person in sitting down more easily, conveniently, safely, and comfortably; at the same time, the movable linkage 2 will cause the two front wheels 10 to extend forward during the lowering process to ensure the stability of the entire wheelchair when the person is seated, making it safer; after the person is seated, the electric push rod 83 can be used to raise the footrest 82, adjusting it to a suitable height according to individual needs; finally, after the person is seated, the brake 6 is released, and the drive motor 7 controls the drive wheel 5 to rotate, thus driving the wheelchair automatically. Conversely, when a person needs to get up, the drive wheel 5 is first stopped by the brake 6; then the footrest 82 is lowered by the electric push rod 83; then the motor output shaft 71 is reversed by the drive motor 7 to rotate forward, which in turn drives the movable linkage 2 to slowly lift, so that the seat cushion 3 and backrest 4 can also be slowly lifted, thus assisting the person to get up slowly, which is more effortless and convenient; at the same time, the movable linkage 2 will drive the two front wheels 10 to move backward and retract during the lifting process; after the person gets off the wheelchair, the footrest 82 can be lifted again by the electric push rod 83 to avoid contact with the ground; finally, the brake 6 is released, and the drive wheel 5 is rotated by the drive motor 7 to drive the wheelchair to the designated location and place for parking.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The above specific embodiments further illustrate the technical problems solved by the present invention, the technical solutions, and the beneficial effects. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent assistive wheelchair, characterized by: The utility model provides a support frame body (1) is equipped with movable link frame (2) on the support frame body (1), movable link frame (2) is installed seat pad (3) and backrest (4) on, both sides of support frame body (1) are provided with drive wheel (5), brake (6) and drive motor (7), the bottom rear end of support frame body (1) is provided with two rear wheels (9), the bottom front end of support frame body (1) is provided with two front wheels (10) with telescopic, The drive motor (7) includes a motor body (70) and a motor output shaft (71), the motor body (70) is installed at the bottom of the movable link frame (2), and the motor output shaft (71) is rotatably installed on the support frame body (1) and connected with the drive wheel (5) at the shaft center of the end. The movable link frame (2) has two states of lifting and lowering, the drive motor (7) can drive the drive wheel (5) to rotate in the unbraked state, and the drive motor (7) can drive the movable link frame (2) to switch between the two states of lifting and lowering by rotating the motor body (70) when the brake (6) stops the drive wheel (5), and the movable link frame (2) can drive the two front wheels (10) to extend and retract when switching states. The movable link frame (2) includes a backrest frame (20), two drive rods (23) rotatably installed on both sides of the bottom end of the backrest frame (20), and two driven rods (24) rotatably installed on both sides of the middle part of the backrest frame (20), one end of the two drive rods (23) away from the backrest frame (20) is fixedly connected to the corresponding motor body (70), and one end of the two driven rods (24) away from the backrest frame (20) is rotatably connected to both sides of the support frame body (1). The backrest (4) is installed on the backrest frame (20), the seat pad (3) is installed between the two driven rods (24), and the drive rod (23) can be rotated up and down under the driving of the motor body (70) to drive the backrest frame (20) and the driven rod (24) to move up and down, so that the backrest (4) and the seat pad (3) are lifted and lowered.

2. The intelligent assist wheelchair of claim 1, wherein: The bottom end of the backrest frame (20) is provided with a first rotating shaft (21), the two drive rods (23) are rotatably connected to both ends of the first rotating shaft (21), the middle part of the backrest frame (20) is provided with a second rotating shaft (22), and the two driven rods (24) are rotatably connected to both ends of the second rotating shaft (22), both sides of the top end of the support frame body (1) are provided with a short shaft (25), and one end of the two driven rods (24) away from the backrest frame (20) is rotatably connected to the corresponding short shaft (25).

3. The intelligent assist wheelchair of claim 1, wherein: The bottom of the support frame body (1) is provided with a limiting support rod (13) rearward, and the drive rod (23) is limited by the limiting support rod (13) after being lowered.

4. The intelligent assist wheelchair of claim 1, wherein: Both sides of the bottom of the movable link frame (2) are rotatably connected with connecting rods (12), both sides of the front end of the support frame body (1) are slidably inserted with front wheel rod frames (11) for installing the front wheels (10), and one end of the connecting rod (12) away from the movable link frame (2) is rotatably installed on the corresponding front wheel rod frame (11); The movable link frame (2) can push the two front wheel frames (11) forward and stretch out through two links (12) during lifting up and lowering down.

5. The intelligent assist wheelchair of claim 4, wherein: The front wheel frame (11) is shaped with an extension column (110) on the side, the extension column (110) is slidingly connected on the support frame body (1), and the link (12) is rotatably connected on the extension column (110) away from the movable link frame (2).

6. The intelligent assist wheelchair of claim 1, wherein: The movable link frame (2) is also rotatably installed with handrails (15) on both sides and is fixed with limiting seats (16) for positioning the handrails (15).

7. The intelligent assist wheelchair of claim 1, wherein: The movable link frame (2) is also provided with two push handles (17) on the rear side.

8. The intelligent assist wheelchair of any one of claims 1-7, wherein: The support frame body (1) is also provided with a pedal mechanism (8) on the front part.

9. The intelligent assist wheelchair of claim 8, wherein: The support frame body (1) is also provided with a cross beam (14) on the upper part, the pedal mechanism (8) comprises an electric push rod (83) and a guide rail (80) installed on the cross beam (14), the electric push rod (83) is downwardly arranged at the telescopic end, the guide rail (80) is arranged up and down, and the guide rail (80) is slidingly connected with a sliding block (81), the sliding block (81) is installed with a foot plate (82) on the front side, and the telescopic end of the electric push rod (83) is connected with the foot plate (82).

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