A wheelchair

Abstract

The present invention provides a wheelchair, comprising a frame and a level adjustment mechanism; the level adjustment mechanism comprises a rotating shaft, an arc-shaped sliding rod, and a pulley; the rotating shaft is rotatably connected to the frame, and the seat cushion is fixed to the rotating shaft; the pulley is fixed to the frame, the sliding rod is slidably matched with the pulley, and the two ends of the arc-shaped sliding rod are fixed to the front and rear positions of the lower surface of the seat cushion; the rotating shaft is coaxial with the arc-shaped sliding rod. The wheelchair provided by the present invention, through the cooperation of the sliding rod and the pulley, the seat cushion rotates with the rotating shaft fixed axis, and the gravity pendulum principle is used to achieve the balance of the human body on the slope, providing user safety.

Description

Technical Field

[0001] The invention relates to the technical field of walking-replacing equipment, in particular to a wheelchair. Background Art

[0002] Most wheelchairs on the market are ordinary wheelchairs with relatively simple product structures and functions, and can generally only be used for traveling on flat ground.

[0003] When an ordinary wheelchair is traveling on a sloped road, the entire wheelchair and the user will tilt at the same angle as the slope. If the slope is too steep, it is easy to overturn, seriously threatening the user's life safety. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to provide a wheelchair that can be adjusted horizontally.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] A wheelchair comprises a frame (1) and a horizontal adjustment mechanism; the horizontal adjustment mechanism comprises a rotating shaft (21), an arc-shaped sliding rod (22), and a pulley (23); the rotating shaft (21) is rotatably connected to the frame (1), and a seat cushion (3) is fixed to the rotating shaft (21); the pulley (23) is fixed to the frame (1), the sliding rod (22) and the pulley (23) are slidably matched, and the two ends of the arc-shaped sliding rod (22) are fixed to the front and rear positions of the lower surface of the seat cushion (3); the rotating shaft (21) and the arc-shaped sliding rod (22) are coaxial.

[0007] The wheelchair provided by the present invention, through the cooperation of the slide bar and the pulley, the seat cushion rotates around the rotating shaft, and the gravity pendulum principle is used to achieve the balance of the human body on the slope, thereby ensuring the safety of the user.

[0008] Furthermore, the arc-shaped sliding rod (22) is a semicircular sliding rod (22), and there are two of them, which are respectively located on the left and right sides of the seat cushion (3).

[0009] Furthermore, a shift rod (25) is installed on the frame (1); the shift rod (25) passes through a through hole formed by the arc-shaped sliding rod (22) and the seat cushion (3).

[0010] Furthermore, the seat cushion (3) comprises an upper and lower pad, each of which is provided with a toilet hole (33) extending downward; a gap of a certain height is provided between the upper and lower pads, and a roller blind (41) is installed in the gap; one end of the roller blind (41) is fixed to one end of the pad via an elastic member (42), and the other end of the roller blind (41) is rotationally connected to the other end of the pad via a winding shaft (43); the winding shaft (43) is fixed to the output shaft of a winding motor (44); when the roller blind (41) is opened, it covers the toilet hole (33) of the lower pad.

[0011] Furthermore, the winding motor (44) is fixed to the side of the seat cushion (3).

[0012] Furthermore, both ends of the winding shaft (43) are fixed to one end of the upper pad or the lower pad via bearings, and a certain gap is provided between the winding shaft (43) and the upper pad or the lower pad.

[0013] Furthermore, the frame (1) includes a backrest (11), a seat cushion frame (12), and a running wheel mounting frame (13); the seat cushion frame (12) is located above the running wheel mounting frame (13) and is fixed at right angles to the backrest (11); the seat cushion frame (12) includes left and right side cross bars (121); the two ends of the rotating shaft (21) are respectively fixed to the cross bars (121) through bearing seats (24); sliding grooves are provided on opposite sides of the two cross bars (121), and one end of the shift rod (25) is slidably matched with the sliding grooves.

[0014] Furthermore, a mounting plate (14) is fixed between the seat cushion frame (12) and the walking wheel mounting frame (13); and the pulley (23) is fixed on the mounting plate (14).

[0015] Furthermore, the vehicle further comprises a reducer (51), an encoder (52), an infrared sensor (53), a gyroscope (54), and an ultrasonic sensor (55); the output shaft of the reducer (51) is coaxially connected to the driving wheel; the encoder (52) is fixed on the vehicle frame (1); the infrared sensor (53), the ultrasonic sensor (55), and the gyroscope (54) are all fixed on the vehicle frame (1); the detection range of the infrared sensor (53) is the front lower part; the detection range of the ultrasonic wave is the horizontal front; the reducer (51), the infrared sensor (53), the gyroscope (54), and the ultrasonic sensor (55) are all connected to the single-chip microcomputer for communication, and the encoder (52) is connected to the reducer (51) for communication.

[0016] Furthermore, the infrared sensor (53), the ultrasonic sensor (55), and the gyroscope (54) are all fixed below the mounting plate (14).

[0017] The advantages of the present invention are:

[0018] The wheelchair provided by the present invention, through the cooperation of the slide bar and the pulley, the seat cushion rotates around the rotating shaft, and the gravity pendulum principle is used to achieve the balance of the human body on the slope, thereby ensuring the safety of the user.

[0019] The toilet hole can also be covered and exposed by a roll-up curtain, especially the curtain is located between the upper and lower pad layers of the seat cushion, and the user does not need to stand up when rolling up, so it is more adaptable.

[0020] Dangerous environments can be identified through infrared sensors, acoustic wave sensors, and gyroscopes, and the vehicle can brake and stop in time with the help of a reducer to achieve obstacle avoidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic side view of the structure of a wheelchair in Embodiment 1 of the present invention;

[0022] Figure 2 is a front view structural schematic diagram of a wheelchair in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the top view of the wheelchair in Example 2 of the present invention after the upper pad is removed;

[0024] Figure 4 is a schematic diagram of the three-dimensional structure of a wheelchair in Embodiment 3 of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A in the middle. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment provides a wheelchair that can be adjusted horizontally. Figure 1 , Figure 2As shown, it includes a frame 1 and a horizontal adjustment mechanism. In this embodiment, the frame 1 includes a backrest 11, a seat frame 12, and a running wheel mounting frame 13, all of which are made of aluminum welding, which is both light and can meet the strength requirements. The seat frame 12 is located above the running wheel mounting frame 13, and is at a right angle to the backrest 11. In this embodiment, the seat frame 12 is two cantilever cross bars 121, which are respectively located on the left and right sides of the backrest 11. A mounting plate 14 is also fixed between the seat frame 12 and the running wheel mounting frame 13 to provide a fixed foundation for the pulley 21. The horizontal adjustment mechanism includes a rotating shaft 21, an arc-shaped slide bar 22, and a pulley 23; the two ends of the rotating shaft 21 are rotatably connected to the two cross bars 121 through a bearing seat 24, and the seat is fixed to the rotating shaft 21; the pulley 23 is fixed on the mounting plate 14, the outer ring of the slide bar 22 is slidably matched with the pulley 23, and the two ends of the arc-shaped slide bar 22 are fixed to the front and rear positions of the lower surface of the seat cushion 3. In this embodiment, the slide bar 22 is semicircular, and the rotation shaft 21 is coaxial with the arc-shaped slide bar 22. When traveling on a slope, the seat cushion 3 rotates around the rotation shaft 21 by using the gravity pendulum principle, and the seat cushion 3 remains stable under the cooperation of the slide bar 22 and the pulley 23, thereby ensuring a horizontal sitting posture and improving safety. In this embodiment, there are two slide bars 22, which are respectively located on the left and right sides below the seat cushion 3, to further ensure the stability of the seat cushion 3.

[0029] In this embodiment, in order to prevent the seat cushion 3 from turning too much and causing tipping, the gear rod 25 is used to limit the rotation angle of the slide bar 22. Specifically, a slide groove is opened on the inner side of the cross bar 121, and one end of the gear rod 25 is slidable in the slide groove through an angle iron, and is fixed by a fastening bolt, so that the gear rod 25 can be adjusted along the length direction of the cross bar 121. The other end of the gear rod 25 passes through a closed through hole formed by the slide bar 22 and the lower surface of the seat cushion 3. When the seat cushion 3 turns to a certain angle, the gear rod 25 limits the sliding of the slide bar 22, and then limits the rotation angle of the seat cushion 3, ensuring that it will not tip over. According to actual needs, the rotation angle of the seat cushion 3 can be adjusted by the position of the gear rod 25 on the cross bar 121.

[0030] The wheelchair uses an aluminum alloy frame and adjustable armrests. The user can adjust the armrest angle according to their own situation, which meets the needs of most people. The relevant control console is set on the outside of the armrest, which is convenient for the user to operate at any time. The adjustable armrest structure is a conventional structure and will not be described in detail here.

[0031] Example 2

[0032] On the basis of embodiment 1, this embodiment further provides a toilet assisting function, such as Figure 2 , 3As shown, specifically: the seat cushion 3 includes two layers of pads 31 and 32, both of which are provided with a toilet hole 33 extending downward; there is a gap of a certain height between the upper and lower pads, and a rolling curtain 41 is installed in the gap; one end of the rolling curtain 41 is fixed to one end of the upper pad or the lower pad through an elastic member 42, and the other end of the rolling curtain 41 is rotatably connected to the other end of the upper pad or the lower pad through a reel 43; the reel 43 is fixed to the output shaft of the reel motor 44; when the rolling curtain 41 is opened, it covers the toilet hole 33 of the lower pad. The two layers of pads can be hinged and fixed at one end, and the other end is an open end, which is convenient for opening, inspecting, and replacing the rolling curtain 41, the reel 43, etc. The reel 43 and the pad can be fixed in a manner that bearings are fixed at both ends of the front side of the lower pad, and the two ends of the reel 43 are respectively inserted into the bearings. It is important that there is a certain gap between the reel 43 and the end face of the pad, which can meet the space requirement for the increase in the diameter of the reel 43 when reeling. One end of the reel 43 is fixed to the output end of the reel motor 44, and the reel motor 44 drives the reel 43 to rotate, thereby reeling the roller blind 41. A gap can be formed between the upper and lower pads by installing a gasket to meet the installation space requirements of the roller blind 41. In addition, the reel 43 can be located at the front or rear end of the cushion 3. When the person in the wheelchair needs to go to the toilet, the reel motor 44 is started to drive the reel 43 to rotate forward, thereby reeling the roller blind 41 and exposing the toilet hole 33 of the lower pad. The simple toilet can be placed on the mounting plate 14. After going to the toilet, the reel motor 44 is started to reverse, and under the reset action of the spring, the roller blind 41 is driven to spread out and cover the toilet hole 33 of the lower pad.

[0033] In this embodiment, the winding motor 44 is fixed to the side of the seat cushion 3 (bolted), and the start button of the winding motor 44 can be set on the armrest of the wheelchair for user operation.

[0034] Example 3

[0035] This embodiment is based on Embodiment 1 or Embodiment 2. Figure 4 , Figure 5 , Figure 6As shown, the obstacle avoidance function is provided, including a reducer 51, an encoder 52, an infrared sensor 53, a gyroscope 54, and an ultrasonic sensor 55; the output shaft of the reducer 51 is connected to the driving wheel and the driving wheel through an elastic pin coupling, which protects the motor shaft and increases the life of the motor shaft; the battery 5 is fixed at the rear of the frame 1, and the encoder 52 is fixed to the reducer 51; the infrared sensor 53, the ultrasonic sensor 55, and the gyroscope 54 are all fixed below the mounting plate 14, and the fixing method is generally bolted, which is convenient for disassembly and replacement. The detection range of the infrared sensor 53 is the front lower part; the ultrasonic detection range is the horizontal front; the reducer 51, the infrared sensor 53, the gyroscope 54, and the ultrasonic sensor 55 are all connected to the single-chip microcomputer for communication. The slope is detected by the three-axis gyroscope 54, and the parallel ultrasonic and obliquely downward infrared sensors 53 are used to detect cliffs and obstacles. The data is processed by the STM32 single-chip microcomputer to control the different speeds of the motors on both sides to achieve kinetic energy such as driving, steering, and obstacle avoidance, and the high-power PWM encoder 52 is controlled by AD to control the motor. The software involved in the obstacle avoidance function in this embodiment is all existing technology.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wheelchair, characterized in that: The vehicle comprises a frame (1) and a horizontal adjustment mechanism; the horizontal adjustment mechanism comprises a rotating shaft (21), an arc-shaped sliding rod (22), and a pulley (23); the rotating shaft (21) is rotatably connected to the frame (1), and the seat cushion (3) is fixed to the rotating shaft (21); the pulley (23) is fixed to the frame (1), the sliding rod (22) and the pulley (23) are slidably matched, and the two ends of the arc-shaped sliding rod (22) are fixed to the front and rear positions of the lower surface of the seat cushion (3); a shift rod (25) is installed on the frame (1); the shift rod (25) passes through a through hole formed by the arc-shaped sliding rod (22) and the seat cushion (3); The arc-shaped sliding rod (22) is a semicircular sliding rod (22), and there are two of them, which are respectively located on the left and right sides of the seat cushion (3); The frame (1) comprises a backrest (11), a seat cushion frame (12), and a running wheel mounting frame (13); the seat cushion frame (12) is located above the running wheel mounting frame (13) and is fixed at right angles to the backrest (11); the seat cushion frame (12) comprises left and right side cross bars (121); the two ends of the rotating shaft (21) are respectively fixed to the cross bars (121) via bearing seats (24); A mounting plate (14) is also fixed between the cushion frame (12) and the walking wheel mounting frame (13); the pulley (23) is fixed on the mounting plate (14); A sliding groove is provided on opposite sides of the two cross bars (121), and one end of the shift rod (25) is slidably matched with the sliding groove.

2. A wheelchair according to claim 1, characterized in that: The seat cushion (3) comprises an upper and lower padding plate, each of which is provided with a toilet hole (33) extending downward; a gap of a certain height is provided between the upper and lower padding plates, and a rolling curtain (41) is installed in the gap; one end of the rolling curtain (41) is fixed to one end of the padding plate through an elastic member (42), and the other end of the rolling curtain (41) is rotationally connected to the other end of the padding plate through a winding shaft (43); the winding shaft (43) is fixed to the output shaft of a winding motor (44); when the rolling curtain (41) is opened, it covers the toilet hole (33) of the lower padding plate.

3. A wheelchair according to claim 2, characterized in that: The winding motor (44) is fixed on the side of the seat cushion (3).

4. A wheelchair according to claim 2, characterized in that: Both ends of the reel (43) are fixed to one end of an upper pad or a lower pad via bearings, and a certain gap is provided between the reel (43) and the upper pad or the lower pad.

5. A wheelchair according to claim 1, characterized in that: The vehicle further comprises a reducer (51), an encoder (52), an infrared sensor (53), a gyroscope (54), and an ultrasonic sensor (55); the output shaft of the reducer (51) is coaxially connected to the driving wheel; the encoder (52) is fixed on the vehicle frame (1); the infrared sensor (53), the ultrasonic sensor (55), and the gyroscope (54) are all fixed on the vehicle frame (1); the detection range of the infrared sensor (53) is the front lower part; the detection range of the ultrasonic wave is the horizontal front; the reducer (51), the infrared sensor (53), the gyroscope (54), and the ultrasonic sensor (55) are all connected to the single-chip microcomputer for communication, and the encoder (52) is connected to the reducer (51) for communication.

6. A wheelchair according to claim 5, characterized in that: The infrared sensor (53), the ultrasonic sensor (55), and the gyroscope (54) are all fixed below the mounting plate (14).

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