A rehabilitation type scooter with synchronous linkage of hand and foot movements

Abstract

This invention relates to the field of rehabilitation mobility scooters, and discloses a rehabilitation mobility scooter with synchronized hand and foot movements. It includes a frame and a hollow plate. A pivot is rotatably connected to the bottom end of the hollow plate. A front wheel is symmetrically fixed to the outer wall of the pivot. A swing arm is fixedly connected to both ends of the pivot. A foot pedal is rotatably connected to the end of the swing arm away from the pivot. A fixing sleeve is installed on the top of the foot pedal. A pulley is fixedly connected to the middle of the pivot. A second pivot is rotatably connected to the top of the hollow plate, and a second pulley is fixedly connected to the middle of the second pivot. Through the user's foot pedaling motion, the arms can be simultaneously raised and swung, completing coordinated limb exercise of the feet and arms. Compared to independent hand and foot exercises, this method better trains limb coordination and linkage, better suits the rehabilitation training needs of patients with limb motor dysfunction, and achieves better rehabilitation training results.

Description

Technical Field

[0001] This invention relates to the field of rehabilitation mobility scooter technology, specifically a rehabilitation mobility scooter that synchronizes hand and foot movements. Background Technology

[0002] In the field of rehabilitation medicine, the main focus is on middle-aged and elderly people with declining limb mobility, people undergoing postoperative limb rehabilitation training, and special groups who have difficulty moving but need to exercise their limbs. These groups need both mobility aids to meet their daily travel needs and professional limb rehabilitation equipment to perform rehabilitation training on their hands and feet in order to restore limb motor function and coordination.

[0003] Traditional limb rehabilitation mobility scooters can only exercise the hands or feet individually, making it difficult to achieve synchronized training of the hands and feet, resulting in poor rehabilitation effects. At the same time, the few existing mobility scooters that also have rehabilitation functions have simple hand exercise structures that can only achieve simple arm raising, lacking targeted exercises for the user's palms and fingers, failing to effectively promote blood circulation in the hands and the recovery of metacarpophalangeal joint activity, thus limiting the rehabilitation effect. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rehabilitation mobility scooter that synchronizes hand and foot movements. This solves the problem that most traditional limb rehabilitation mobility scooters can only exercise the hands or feet individually, making it difficult to achieve synchronized hand and foot training, resulting in poor rehabilitation effects. Furthermore, the few existing mobility scooters with rehabilitation functions have simple hand exercise structures, only enabling simple arm raising, lacking targeted exercises for the user's palms and fingers, failing to effectively promote blood circulation in the hands and restore the activity of the metacarpophalangeal joints, thus limiting rehabilitation effects.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rehabilitation mobility scooter with synchronized hand and foot movements, comprising a frame and a hollow plate. A rotating column is rotatably connected to the bottom end of the hollow plate. A front wheel is symmetrically fixed to the outer wall of the rotating column. A swing arm is fixedly connected to both ends of the rotating column. A foot pedal is rotatably connected to the end of the swing arm away from the rotating column. A fixing sleeve is installed on the top of the foot pedal. A pulley is fixedly connected to the middle of the rotating column. A second rotating column is rotatably connected to the top end of the hollow plate. A second pulley is fixedly connected to the middle of the second rotating column. A conveyor belt is fitted onto the outer walls of the first and second pulleys. The first pulley, the second pulley, and the conveyor belt are all disposed within the hollow plate. A swing arm is fixedly connected to both ends of the second rotating column. Arm placement assemblies are provided on both sides of the hollow plate.

[0006] By adopting the above technical solution, the power of the foot pedal is transmitted to the arm exercise structure through the transmission of pulleys and conveyor belts. This allows the user's foot pedaling action to synchronously drive the arm to perform lifting and swinging movements, completing coordinated limb exercise of the feet and arms. Compared with the exercise method of hands and feet independently, it can better exercise the coordination and linkage of the limbs, better meet the rehabilitation training needs of patients with limb motor dysfunction, and achieve better rehabilitation exercise results.

[0007] Through the linkage structure of the air pump, piston, telescopic rod and airbag, the swinging motion of the arm is transformed into the repeated inflation and deflation of the airbag. Through the repeated inflation and deflation of the airbag, the user's hand is subjected to reciprocating pressure and relaxation exercises, completing targeted rehabilitation exercises for the user's hand, effectively promoting blood circulation in the hand and helping to restore the motor function of the metacarpophalangeal joints.

[0008] Preferably, the arm placement assembly includes a connecting block, one side of which is fixedly connected to one side of the cavity plate, a support plate is fixedly connected to one side of the connecting block, a mounting base is fixedly connected to the top of the support plate, a fixing block is rotatably connected inside the mounting base, and a support plate is fixedly connected to the top of the fixing block.

[0009] Preferably, a telescopic plate is slidably connected inside the first support plate, and a second support plate is fixedly connected to one end of the telescopic plate. A fixing rod is installed on one side of the second support plate, and the outer wall of the fixing rod is rotatably connected to the top of the second swing arm. A hand exercise component is provided on the top of the second support plate.

[0010] Preferably, the hand exercise component includes a fixed ear, the bottom of which is fixedly connected to the top of the support plate 2. A fixed post is installed on one side of the fixed ear, and a flexible glove is provided on one side of the fixed post. An airbag is provided inside the flexible glove.

[0011] Preferably, a fixed base is fixedly connected to the top of the support plate, an air cylinder is rotatably connected inside the fixed base, a piston is slidably connected inside the air cylinder, and a telescopic rod is fixedly connected to one side of the piston.

[0012] Preferably, the end of the telescopic rod away from the air cylinder is rotatably connected to a fixed seat two, and the top of the fixed seat two is fixedly connected to the bottom of the support plate two.

[0013] Preferably, the bottom end of the air cylinder is fixedly connected to an air tube channel, and the end of the air tube channel away from the fixing seat is fixedly connected to one side of the air bag.

[0014] Preferably, the support plate has a through hole inside, and the outer wall of the airway channel passes through the through hole.

[0015] Preferably, a crossbar is rotatably connected to the end of the frame away from the front wheel, and both ends of the crossbar are fixedly connected to the rear wheel.

[0016] Preferably, a seat is fixedly connected to the top of the frame, and a backrest is installed on one side of the seat.

[0017] Working principle: The user places his feet on the foot pedal and fixes them in place by the fixed sleeve on top. He places his arms on the support plate and puts his hands in the flexible gloves. He then pedals the foot pedal, which drives the swing arm to swing around the rotating column, thereby driving the rotating column to rotate at the bottom of the cavity plate. The rotating column directly drives the front wheel on its outer wall to rotate. Together with the rear wheel on the crossbar at the rear end of the frame, the entire mobility scooter moves and completes its mobility function.

[0018] As the rotating column rotates, the central pulley rotates synchronously. The pulley rotates through the conveyor belt in the cavity plate, which drives the second pulley to rotate, thereby driving the second rotating column to rotate synchronously at the top of the cavity plate. When the second rotating column rotates, it drives the two swing rods at both ends to swing. The swing rods pull the second support plate through the fixed rod, causing the second support plate to slide back and forth within the first support plate. At the same time, the fixed block rotates within the mounting base, realizing the overall swing of the arm placement component. This causes the user's arm to lift synchronously with the foot's pedaling motion, completing the coordinated limb exercise of the feet and arms.

[0019] The second swing arm pulls the second support plate through the fixed rod, causing the second support plate to slide back and forth within the first support plate. Simultaneously, the second fixed seat at the bottom of the second support plate reciprocates, which in turn pulls the telescopic rod to extend and retract within the air cylinder. This causes the piston within the air cylinder to slide back and forth. As the piston slides, it compresses and draws in the gas within the air cylinder, allowing the gas to be transferred back and forth between the air cylinder and the airbag inside the flexible glove through the air tube channel. This achieves the inflation and deflation of the airbag. When the airbag is inflated, it forms a gentle compression on the user's palm and fingers. When it deflates, the compression force disappears. Through the repeated inflation and deflation of the airbag, the user's hands are subjected to reciprocating pressure and relaxation exercises, completing targeted rehabilitation exercises for the user's hands and promoting blood circulation in the hands.

[0020] When users only need to perform limb rehabilitation exercises and do not need the mobility scooter to move, the support bracket can be used to support and lift the first pivot of the front wheel. This operation will not affect the normal rotation of the first pivot, thus positioning the vehicle so that the exercise effect can be achieved even if the vehicle does not move forward.

[0021] This invention provides a rehabilitation mobility scooter that synchronizes hand and foot movements. It has the following beneficial effects:

[0022] 1. This invention transmits the power of the foot pedal to the arm exercise structure through the transmission of pulleys and conveyor belts, so that the user's foot pedaling action can synchronously drive the arm to make lifting and swinging movements, completing the coordinated limb exercise of the foot and arm. Compared with the exercise method of independent hand and foot, it can better exercise the coordination and linkage of the limbs, and is more suitable for the rehabilitation training needs of patients with limb motor dysfunction, resulting in better rehabilitation exercise effect.

[0023] 2. This invention, through the linkage structure of air cylinder, piston, telescopic rod and air bag, transforms the swinging motion of the arm into the repeated inflation and deflation of the air bag. Through the repeated inflation and deflation of the air bag, the user's hand is subjected to reciprocating pressing and relaxation exercises, completing targeted rehabilitation exercises for the user's hand, effectively promoting blood circulation in the hand and helping to restore the motor function of the metacarpophalangeal joints.

[0024] 3. This invention allows the mobility scooter to move and the limb rehabilitation exercise process to be carried out simultaneously, breaking the traditional situation where mobility and exercise are separated. While meeting the user's daily travel needs, it completes limb rehabilitation training that coordinates hand and foot movements, thus improving the overall utilization rate of the equipment. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of a partial structure of the vehicle frame of the present invention;

[0027] Figure 3 This is a partial structural diagram of the seat of the present invention;

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

[0029] Figure 5 This is a partial structural diagram of the conveyor belt of the present invention;

[0030] Figure 6 This is a partial structural diagram of the support plate of the present invention;

[0031] Figure 7 This is a partial structural diagram of the support plate of the present invention;

[0032] Figure 8 This is a partial structural diagram of the support plate of the present invention;

[0033] Figure 9 This is a partial structural diagram of the telescopic plate of the present invention.

[0034] The components are as follows: 1. Frame; 2. Hollow plate; 3. Crossbar; 4. Rear wheel; 5. Rotary column one; 6. Front wheel; 7. Swing arm one; 8. Foot pedal; 9. Fixing sleeve; 10. Pulley one; 11. Rotary column two; 12. Pulley two; 13. Conveyor belt; 14. Arm placement assembly; 1401. Connecting block; 1402. Support plate; 1403. Mounting seat; 1404. Fixing block; 1405. Support plate one; 1406. Telescopic plate; 1407. Support plate two; 15. Hand exercise assembly; 1501. Fixing ear; 1502. Fixing column; 1503. Flexible glove; 1504. Airbag; 1505. Fixing seat one; 1506. Air pump; 1507. Telescopic rod; 1508. Fixing seat two; 1509. Airway; 16. Swing arm two; 17. Seat; 18. Backrest. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see the appendix Figure 1 - Appendix Figure 9 This invention provides a rehabilitation mobility scooter with synchronized hand and foot movements, including a frame 1 and a hollow plate 2. A rotating column 5 is rotatably connected to the bottom end of the hollow plate 2. A front wheel 6 is symmetrically fixedly connected to the outer wall of the rotating column 5. A swing arm 7 is fixedly connected to both ends of the rotating column 5. A foot pedal 8 is rotatably connected to the end of the swing arm 7 away from the rotating column 5. A fixing sleeve 9 is installed on the top of the foot pedal 8. A pulley 10 is fixedly connected to the middle of the rotating column 5. A rotating column 21 is rotatably connected to the top end of the hollow plate 2. A pulley 22 is fixedly connected to the middle of the rotating column 21. A conveyor belt 13 is sleeved on the outer wall of the pulley 10 and the pulley 22. The pulley 10, the pulley 22 and the conveyor belt 13 are all arranged inside the hollow plate 2. A swing arm 16 is fixedly connected to both ends of the rotating column 21. Arm placement components 14 are provided on both sides of the hollow plate 2.

[0037] Specifically, the user places their foot on the foot pedal 8 and fixes it with the fixing sleeve 9 on top. They place their arm on the support plate and put their hand inside the flexible glove 1503. They then pedal the foot pedal 8, which drives the swing arm 7 to swing around the rotating column 5 in a circular motion. This drives the rotating column 5 to rotate at the bottom of the cavity plate 2. The rotating column 5 directly drives the front wheel 6 on its outer wall to rotate. Together with the rear wheel 4 on the rear crossbar 3 of the frame 1, the user can move the entire mobility vehicle and complete the mobility function.

[0038] As the rotating column 5 rotates, the central pulley 10 rotates synchronously. The pulley 10 drives the pulley 12 to rotate via the conveyor belt 13 inside the cavity plate 2, which in turn drives the rotating column 11 to rotate synchronously at the top of the cavity plate 2. When the rotating column 11 rotates, it drives the swing rods 16 at both ends to swing. The swing rods 16 pull the support plate 1407 via the fixed rod, causing the support plate 1407 to drive the telescopic plate 1406 to slide back and forth within the support plate 1405. At the same time, the fixed block 1404 rotates within the mounting base 1403, realizing the overall swing of the arm placement component 14. This causes the user's arm to perform a synchronous lifting movement in conjunction with the foot's pedaling action, completing the coordinated limb exercise of the feet and arms. Compared with the exercise method of independent hand and foot exercise, it can better exercise the coordination and linkage of the limbs, and is more suitable for the rehabilitation training needs of patients with limb motor dysfunction, resulting in better rehabilitation exercise effects.

[0039] This allows the mobility scooter to move and the limb rehabilitation exercise to proceed simultaneously, breaking the traditional separation of mobility and exercise. While meeting the user's daily travel needs, it also enables limb rehabilitation training that coordinates hand and foot movements, thus improving the overall utilization rate of the equipment.

[0040] Please see the appendix Figure 1 - Appendix Figure 2 , Figure 4 , Figures 6-9 The arm placement component 14 includes a connecting block 1401. One side of the connecting block 1401 is fixedly connected to one side of the cavity plate 2. A support plate 1402 is fixedly connected to one side of the connecting block 1401. A mounting base 1403 is fixedly connected to the top of the support plate 1402. A fixing block 1404 is rotatably connected inside the mounting base 1403. A support plate 1405 is fixedly connected to the top of the fixing block 1404. A telescopic plate 1406 is slidably connected inside the support plate 1405. A support plate 2 1407 is fixedly connected to one end of the telescopic plate 1406. A fixing rod is installed on one side of the support plate 2 1407. The outer wall of the fixing rod is rotatably connected to the top of the swing arm 2 16. A hand exercise component 15 is provided on the top of the support plate 2 1407.

[0041] Specifically, as the rotating column 5 rotates, the central pulley 10 rotates synchronously. The pulley 10 drives the pulley 12 to rotate via the conveyor belt 13 inside the cavity plate 2, which in turn drives the rotating column 11 to rotate synchronously at the top of the cavity plate 2. When the rotating column 11 rotates, it drives the swing rods 16 at both ends to swing. The swing rods 16 pull the support plate 1407 via the fixed rod, causing the support plate 1407 to drive the telescopic plate 1406 to slide back and forth within the support plate 1405. At the same time, the fixed block 1404 rotates within the mounting base 1403, realizing the overall swing of the arm placement component 14. This causes the user's arm to perform a synchronized lifting motion with the foot's pedaling action, completing the coordinated limb exercise of the feet and arms. Compared with the exercise method of independent hand and foot exercises, it can better exercise the coordination and linkage of the limbs, and is more suitable for the rehabilitation training needs of patients with limb motor dysfunction, resulting in better rehabilitation exercise effects.

[0042] Please see the appendix Figure 1 - Appendix Figure 9 The hand exercise component 15 includes a fixing ear 1501, the bottom of which is fixedly connected to the top of the support plate 1407. A fixing post 1502 is installed on one side of the fixing ear 1501, and a flexible glove 1503 is provided on one side of the fixing post 1502. An air bladder 1504 is provided inside the flexible glove 1503. A fixing seat 1505 is fixedly connected to the top of the support plate 1402, and an air pump 150 is rotatably connected inside the fixing seat 1505. 6. A piston is slidably connected inside the air cylinder 1506. A telescopic rod 1507 is fixedly connected to one side of the piston. A fixed seat 1508 is rotatably connected to the end of the telescopic rod 1507 away from the air cylinder 1506. The top of the fixed seat 1508 is fixedly connected to the bottom of the support plate 1407. An air pipe channel 1509 is fixedly connected to the bottom of the air cylinder 1506. The end of the air pipe channel 1509 away from the fixed seat 1505 is fixedly connected to one side of the airbag 1504.

[0043] Specifically, when exercising the palms and fingers, the second pendulum 16 pulls the second support plate 1407 via the fixed rod. This causes the second support plate 1407 to move the telescopic plate 1406 back and forth within the first support plate 1405. Simultaneously, the fixed seat 1508 at the bottom of the second support plate 1407 reciprocates, pulling the telescopic rod 1507 to extend and retract within the air cylinder 1506. This causes the piston within the air cylinder 1506 to slide back and forth, compressing and drawing in the gas within the cylinder. Gas is transferred back and forth between the air cylinder 1506 and the airbag 1504 inside the flexible glove 1503 through the tracheal channel 1509, realizing the inflation and deflation of the airbag 1504. When the airbag 1504 is inflated, it forms a gentle squeeze on the user's palm and fingers. When it is deflated, the squeezing force disappears. Through the repeated inflation and deflation of the airbag 1504, the user's hand is subjected to reciprocating pressure and relaxation exercises, completing targeted rehabilitation exercises for the user's hand, effectively promoting blood circulation in the hand, and helping to restore the motor function of the metacarpophalangeal joints.

[0044] Please see the appendix Figure 9 The support plate 1402 has a through hole inside, and the outer wall of the air pipe channel 1509 passes through the through hole.

[0045] Specifically, the through holes in the support plate 1402 provide a dedicated path for the air tube channel 1509, allowing the air tube channel 1509, which originally connects the air cylinder 1506 and the air bag 1504 inside the flexible glove 1503, to be arranged in an orderly manner along the bottom of the support plate 1402, avoiding the stacking of air tubes. At the same time, it prevents the air tubes from getting tangled with moving parts such as the telescopic plate 1406 and the swing arm 16, ensuring the normal reciprocating motion of the mechanical structure and avoiding equipment jamming or air tube damage caused by the tangling of pipelines.

[0046] Please see the appendix Figure 1 - Appendix Figure 3 A crossbar 3 is rotatably connected to the end of the frame 1 away from the front wheel 6. Both ends of the crossbar 3 are fixedly connected to the rear wheel 4. A seat 17 is fixedly connected to the top of the frame 1. A backrest 18 is installed on one side of the seat 17.

[0047] Specifically, when the user pedals the foot pedal 8 to drive the rotating column 5 to rotate, causing the front wheel 6 to rotate, the rear wheel 4 adapts to the rotation of the crossbar 3 and rolls, which, together with the driving force of the front wheel 6, enables the overall movement and steering of the mobility scooter. The rotational connection between the crossbar 3 and the frame 1 allows the rolling angle of the rear wheel 4 to be adjusted synchronously according to the steering direction of the front wheel 6, ensuring the smoothness and flexibility of the mobility scooter's movement.

[0048] The seat 17 fixed at the top of the frame 1 provides stable support for the user, and the backrest 18 helps the user fix their body posture. When the user sits on the seat 17 and leans against the backrest 18, they can place their feet naturally on the foot pedal 8 and rest their arms on the support plate of the arm rest assembly 14, forming an ergonomic force-generating posture. When performing rehabilitation exercises with synchronized hand and foot movements by pedaling the foot pedal 8, the fixed support of the seat 17 and the backrest 18 can prevent the user from dispersing their force due to body swaying, ensuring that the pedaling power is stably transmitted to the pivot column 5. At the same time, when the arms swing with the swing arm 16, the body has a stable support point, ensuring the standardization and effectiveness of the rehabilitation exercise movements.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rehabilitation type scooter with synchronous linkage of hand and foot movement, comprising a frame (1) and a cavity plate (2), characterized in that: The bottom end of the cavity plate (2) is rotatably connected to a rotating column (5). A front wheel (6) is symmetrically fixed to the outer wall of the rotating column (5). Both ends of the rotating column (5) are fixedly connected to a swing arm (7). The end of the swing arm (7) away from the rotating column (5) is rotatably connected to a foot pedal (8). A fixing sleeve (9) is installed on the top of the foot pedal (8). A pulley (10) is fixedly connected to the middle of the rotating column (5). The top end of the cavity plate (2) rotates... A rotating column (11) is connected to the rotating column (11), and a pulley (12) is fixedly connected to the middle of the rotating column (11). A conveyor belt (13) is sleeved on the outer wall of the pulley (10) and the pulley (12). The pulley (10), the pulley (12) and the conveyor belt (13) are all arranged in the cavity plate (2). A swing rod (16) is fixedly connected to both ends of the rotating column (11). An arm placement assembly (14) is provided on both sides of the cavity plate (2).

2. The rehabilitation mobility scooter with synchronized hand and foot movements according to claim 1, characterized in that: The arm placement assembly (14) includes a connecting block (1401), one side of which is fixedly connected to one side of the cavity plate (2), a support plate (1402) is fixedly connected to one side of the connecting block (1401), a mounting base (1403) is fixedly connected to the top of the support plate (1402), a fixing block (1404) is rotatably connected inside the mounting base (1403), and a support plate (1405) is fixedly connected to the top of the fixing block (1404).

3. The rehabilitation mobility scooter with synchronized hand and foot movements according to claim 2, characterized in that: The support plate one (1405) is internally slidably connected to a telescopic plate (1406), and one end of the telescopic plate (1406) is fixedly connected to a support plate two (1407). A fixing rod is installed on one side of the support plate two (1407), and the outer wall of the fixing rod is rotatably connected to the top of the swing rod two (16). A hand exercise component (15) is provided on the top of the support plate two (1407).

4. The rehabilitation mobility scooter with synchronized hand and foot movements according to claim 3, characterized in that: The hand exercise component (15) includes a fixed ear (1501), the bottom of which is fixedly connected to the top of the support plate (1407). A fixed post (1502) is installed on one side of the fixed ear (1501), and a flexible glove (1503) is provided on one side of the fixed post (1502). An airbag (1504) is provided inside the flexible glove (1503).

5. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 4, characterized in that: The top of the support plate (1402) is fixedly connected to a fixed seat (1505), and an air cylinder (1506) is rotatably connected inside the fixed seat (1505). A piston is slidably connected inside the air cylinder (1506), and a telescopic rod (1507) is fixedly connected to one side of the piston.

6. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 5, characterized in that: The end of the telescopic rod (1507) away from the air cylinder (1506) is rotatably connected to a fixed seat two (1508), and the top of the fixed seat two (1508) is fixedly connected to the bottom of the support plate two (1407).

7. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 6, characterized in that: The bottom end of the air cylinder (1506) is fixedly connected to an air tube channel (1509), and the end of the air tube channel (1509) away from the fixing seat (1505) is fixedly connected to one side of the air bag (1504).

8. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 7, characterized in that: The support plate (1402) has a through hole inside, and the outer wall of the air duct channel (1509) passes through the through hole.

9. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 1, characterized in that: The frame (1) is rotatably connected to a crossbar (3) at one end away from the front wheel (6), and both ends of the crossbar (3) are fixedly connected to the rear wheel (4).

10. A rehabilitation mobility scooter with synchronized hand and foot movements according to claim 1, characterized in that: A seat (17) is fixedly connected to the top of the frame (1), and a backrest (18) is installed on one side of the seat (17).

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