Adjustable seat structure for a wheelchair

Abstract

This utility model relates to the field of seat structure technology, specifically an adjustable seat structure for wheelchairs, including a seat plate with two armrests symmetrically fixed to its upper surface. This utility model uses an elastic cord to loop around the right end of a connecting rod, causing a support plate to fit against the lower surface of the seat plate. The piston rod of an electric cylinder extends and retracts, causing a circular plate to move up and down. When the circular plate moves upward, it provides a lifting force to raise the seat plate; when it moves downward, the seat plate lowers under gravity, thus allowing for seat height adjustment. Moving the elastic cord releases the connecting rod, and the support plate rotates under gravity, causing the retaining teeth at the bottom of the support plate to engage with the upper surface of a wedge-shaped plate. The electric cylinder moves the circular plate slightly downward, causing the seat plate to press down on the support plate and retaining teeth. The retaining teeth engage the wedge-shaped plate, making the support plate a support for the seat plate. This prevents the electric cylinder from being continuously under pressure, which could affect its lifespan. By adjusting the seat height, the seat can be adapted to users of different heights.

Description

Technical Field

[0001] This utility model relates to the field of seat structure technology, specifically an adjustable seat structure for wheelchairs. Background Technology

[0002] A wheelchair is a chair equipped with wheels that helps replace walking. It is an important mobility tool for the injured, sick, and disabled to use at home for rehabilitation, transportation, medical treatment, and outdoor activities. Wheelchairs not only meet the mobility needs of people with limb disabilities and limited mobility, but more importantly, they facilitate the movement and care of family members, and enable patients to exercise and participate in social activities with the help of wheelchairs. Traditional wheelchair designs typically employ a fixed-height seat structure, where the relative distance between the seat and footrests is fixed and cannot be changed. For shorter users, a seat that is too high prevents their feet from resting stably on the footrests, causing their feet to dangle for extended periods, compressing blood vessels and nerves in the back of the thighs, affecting blood circulation, and causing discomfort. Conversely, for taller users, a seat that is too low causes excessive knee flexion, compresses the space between the thighs and abdomen, and results in a cramped sitting posture. Prolonged use can easily lead to lower back fatigue and pain, seriously affecting the comfort and health of the user. Therefore, meeting the personalized needs of users of different heights is one of the problems that needs to be solved. To address this, an adjustable seat structure for wheelchairs is proposed. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable seat structure for wheelchairs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an adjustable seat structure for a wheelchair, including a seat plate, two armrests symmetrically fixedly connected to the upper surface of the seat plate, a back plate fixedly connected to the right side of the upper surface of the seat plate, a base plate below the seat plate, wheels mounted on both sides of the outer side wall of the base plate, a frame fixedly connected to the left side of the lower surface of the seat plate, two universal wheels symmetrically mounted on the lower surface of the frame, positioning rods fixedly connected to the four corners of the lower surface of the seat plate, the positioning rods slidably connected to the base plate, a fixing frame fixedly connected to the lower surface of the base plate, a through groove opened in the middle of the lower surface of the base plate, an electric cylinder mounted on the inner side wall of the fixing frame, a circular plate fixedly connected to one end of the piston rod of the electric cylinder, two support plates symmetrically hinged to the lower surface of the seat plate, two wedge-tooth plates symmetrically fixedly connected to the upper surface of the base plate, a locking tooth fixedly connected to the bottom end of the support plate, a connecting rod fixedly connected to the right side wall of the support plate, and two elastic ropes symmetrically fixedly connected to the bottom of the right side wall of the back plate.

[0005] As a further preferred embodiment of this technical solution: two support rods are symmetrically and fixedly connected to the outer side wall of the frame, and a footboard is fixedly connected to the top of the support rods.

[0006] As a further preferred embodiment of this technical solution: an anti-slip plate is fixedly connected to the upper surface of the pedal, and the upper surface of the anti-slip plate is uniformly provided with anti-slip texture.

[0007] As a further preferred embodiment of this technical solution: a curved plate is fixedly connected to the upper surface of one of the handrails, and a controller is fixedly connected to the top of the curved plate. The electrical output terminal of the controller is electrically connected to the electrical input terminal of the electric cylinder through a wire.

[0008] As a further preferred embodiment of this technical solution: a slot is provided on the upper surface of the back plate, an insert plate is inserted into the inner side wall of the slot, and a headrest is fixedly connected to the top of the insert plate.

[0009] As a further preferred embodiment of this technical solution: the lower surface of the headrest and the upper surface of the back panel are both symmetrically and fixedly connected with two magnetic blocks.

[0010] As a further preferred embodiment of this technical solution, two push handles are symmetrically fixedly connected to the upper part of the right side wall of the back plate.

[0011] As a further preferred embodiment of this technical solution, the support plate, the wedge plate, and the locking teeth are all made of aluminum alloy.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention uses an elastic cord to secure the right end of a connecting rod, allowing the support plate to fit against the lower surface of the seat. The piston rod of an electric cylinder extends and retracts, causing a circular plate to move up and down. When the circular plate moves upward, it provides lifting force, raising the seat. When the circular plate moves downward, the seat lowers under gravity, thus allowing for height adjustment. Moving the elastic cord releases the connecting rod, and the support plate rotates under gravity, causing the retaining teeth at the bottom of the support plate to engage with the upper surface of a wedge-shaped plate. The electric cylinder then moves the circular plate slightly downward, causing the seat to press down on the support plate and retaining teeth. The retaining teeth engage the wedge-shaped plate, making the support plate a support for the seat. This prevents the electric cylinder from being under continuous pressure, which could affect its lifespan. By adjusting the seat height, the seat can accommodate users of different heights, preventing users' feet from dangling or their knees from excessive flexion, thus improving user comfort and health and bringing convenience to wheelchair use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the left-side structure of this utility model; Figure 2 This is a schematic diagram of the rear view structure of this utility model; Figure 3 This is a front view structural diagram of the present utility model; Figure 4This is a schematic diagram of the structure of the support plate and the wedge tooth plate in this utility model; Figure 5 In this utility model Figure 4 Enlarged view of the structure of area A; Figure 6 This is a schematic diagram of the structure of the support plate and connecting rod in this utility model; Figure 7 This is a schematic diagram of the back plate and slot in this utility model.

[0014] In the picture: 1. Seat plate; 2. Backrest plate; 3. Wheels; 4. Frame; 5. Casters; 6. Base plate; 7. Positioning rod; 8. Fixing frame; 9. Electric cylinder; 10. Circular plate; 11. Support plate; 12. Wedge plate; 13. Clamping tooth; 14. Connecting rod; 15. Elastic rope; 16. Through groove; 17. Support rod; 18. Pedal; 19. Anti-slip plate; 20. Curved plate; 21. Controller; 22. Slot; 23. Insert plate; 24. Headrest; 25. Magnetic block; 26. Push handle; 27. Armrest. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "equipment" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0017] Please see Figure 1-7This utility model provides a technical solution: an adjustable seat structure for a wheelchair, including a seat plate 1, two armrests 27 symmetrically fixedly connected to the upper surface of the seat plate 1, a backrest 2 fixedly connected to the right side of the upper surface of the seat plate 1, a base plate 6 provided below the seat plate 1, and wheels 3 installed on both sides of the outer side wall of the base plate 6. A frame 4 is fixedly connected to the left side of the lower surface of the seat plate 1, and two universal wheels 5 are symmetrically installed on the lower surface of the frame 4. Positioning rods 7 are fixedly connected to the four corners of the lower surface of the seat plate 1, and the positioning rods 7 slide against the base plate 6. The base plate 6 is connected to a fixed bracket 8, and a through groove 16 is provided in the middle of the lower surface of the base plate 6. An electric cylinder 9 is installed on the inner side wall of the fixed bracket 8. A circular plate 10 is fixedly connected to one end of the piston rod of the electric cylinder 9. Two support plates 11 are symmetrically hinged to the lower surface of the seat plate 1. Two wedge plates 12 are symmetrically fixedly connected to the upper surface of the base plate 6. A locking tooth 13 is fixedly connected to the bottom end of the support plate 11. A connecting rod 14 is fixedly connected to the right side wall of the support plate 11. Two elastic ropes are symmetrically fixedly connected to the bottom of the right side wall of the back plate 2. 15; The electric cylinder 9 has a self-locking structure; the elastic rope 15 is stretched to loop the right end of the connecting rod 14, so that the support plate 11 is in contact with the lower surface of the seat plate 1. The piston rod of the electric cylinder 9 extends and retracts, driving the circular plate 10 to move up and down. When the circular plate 10 moves up, it provides a lifting force to raise the seat plate 1. When the circular plate 10 moves down, the seat plate 1 is lowered under the action of gravity, so that the height of the seat plate 1 can be adjusted. The elastic rope 15 is moved so that it is no longer binding the connecting rod 14. The support plate 11 rotates under the action of gravity, so that the retaining teeth at the bottom of the support plate 11... The upper surface of the wedge plate 12 is fitted with the electric cylinder 9, which drives the circular plate 10 to move down slightly. The seat plate 1 presses down on the support plate 11 and the locking teeth 13. The locking teeth 13 lock the wedge plate 12, so that the support plate 11 becomes the support of the seat plate 1. This avoids the electric cylinder 9 being in a state of continuous pressure, which affects its service life. By adjusting the height of the seat plate 1, the seat can be adapted to users of different heights, avoiding situations where the user's feet are dangling or the knee joint is excessively flexed. This improves the user's comfort and health, and brings convenience to the use of wheelchairs.

[0018] In this embodiment, specifically: two support rods 17 are symmetrically fixedly connected to the outer side wall of the frame 4, and a footboard 18 is fixedly connected to the top of the support rods 17; the footboard 18 is provided for placing the feet.

[0019] In this embodiment, specifically: an anti-slip plate 19 is fixedly connected to the upper surface of the pedal 18, and the upper surface of the anti-slip plate 19 is evenly provided with anti-slip texture; this facilitates increased friction and prevents the user's feet from slipping.

[0020] In this embodiment, specifically: a curved plate 20 is fixedly connected to the upper surface of a handrail 27, and a controller 21 is fixedly connected to the top of the curved plate 20. The electrical output terminal of the controller 21 is electrically connected to the electrical input terminal of the electric cylinder 9 through a wire; this facilitates the control of the working state of the electric cylinder 9.

[0021] In this embodiment, specifically: a slot 22 is provided on the upper surface of the back panel 2, an insert plate 23 is inserted into the inner side wall of the slot 22, and a headrest 24 is fixedly connected to the top of the insert plate 23; inserting the headrest 24 provides support for the user's head and increases the comfort of use.

[0022] In this embodiment, specifically: two magnetic blocks 25 are symmetrically fixedly connected to the lower surface of the headrest 24 and the upper surface of the back panel 2; the magnetic attraction between the magnetic blocks 25 can provide a fixing force to prevent the headrest 24 from falling off accidentally.

[0023] In this embodiment, specifically: two push handles 26 are symmetrically fixedly connected to the upper part of the right side wall of the back panel 2; to facilitate the movement of the wheelchair.

[0024] In this embodiment, specifically: the support plate 11, the wedge plate 12, and the locking teeth 13 are all made of aluminum alloy; by taking advantage of the lightweight, strong support, and non-breakable characteristics of aluminum alloy, the durability of the support plate 11, the wedge plate 12, and the locking teeth 13 is improved.

[0025] The working principle of this utility model is as follows: The elastic rope 15 is stretched to loop around the right end of the connecting rod 14, causing the support plate 11 to fit against the lower surface of the seat plate 1. The piston rod of the electric cylinder 9 extends and retracts, causing the circular plate 10 to move up and down. When the circular plate 10 moves upward, it provides a lifting force to raise the seat plate 1; when the circular plate 10 moves downward, the seat plate 1 lowers under gravity, thus allowing adjustment of the seat plate 1's height. Moving the elastic rope 15 releases the connecting rod 14, and the support plate 11 rotates under gravity, causing the bottom of the support plate 11 to... The locking teeth 13 at the end fit against the upper surface of the wedge plate 12. The electric cylinder 9 drives the circular plate 10 to move down slightly, and the seat plate 1 presses down on the support plate 11 and the locking teeth 13. The locking teeth 13 lock the wedge plate 12, so that the support plate 11 becomes the support of the seat plate 1, avoiding the electric cylinder 9 from being in a state of continuous pressure and affecting its service life. By adjusting the height of the seat plate 1, the seat can be adapted to users of different heights, avoiding the situation where the user's feet are dangling or the knee joint is excessively flexed, thus improving the user's comfort and health.

[0026] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable seat structure for a wheelchair, characterized in that: The system includes a seat plate (1), on which two armrests (27) are symmetrically fixedly connected. A back plate (2) is fixedly connected to the right side of the upper surface of the seat plate (1). A base plate (6) is provided below the seat plate (1). Both sides of the outer side wall of the base plate (6) are equipped with wheels (3). A frame (4) is fixedly connected to the left side of the lower surface of the seat plate (1). Two universal wheels (5) are symmetrically installed on the lower surface of the frame (4). Positioning rods (7) are fixedly connected to the four corners of the lower surface of the seat plate (1). The positioning rods (7) are slidably connected to the base plate (6). The lower surface of the base plate (6) is fixedly connected to... A fixed frame (8) is attached. A through groove (16) is provided in the middle of the lower surface of the base plate (6). An electric cylinder (9) is installed on the inner side wall of the fixed frame (8). A circular plate (10) is fixedly connected to one end of the piston rod of the electric cylinder (9). Two support plates (11) are symmetrically hinged to the lower surface of the seat plate (1). Two wedge plates (12) are symmetrically fixedly connected to the upper surface of the base plate (6). A locking tooth (13) is fixedly connected to the bottom end of the support plate (11). A connecting rod (14) is fixedly connected to the right side wall of the support plate (11). Two elastic ropes (15) are symmetrically fixedly connected to the bottom of the right side wall of the back plate (2).

2. The adjustable seat structure for wheelchairs according to claim 1, characterized in that: Two support rods (17) are symmetrically fixedly connected to the outer side wall of the frame (4), and a footboard (18) is fixedly connected to the top of the support rods (17).

3. The adjustable seat structure for wheelchairs according to claim 2, characterized in that: The upper surface of the pedal (18) is fixedly connected to an anti-slip plate (19), and the upper surface of the anti-slip plate (19) is uniformly provided with anti-slip texture.

4. The adjustable seat structure for wheelchairs according to claim 3, characterized in that: A curved plate (20) is fixedly connected to the upper surface of one of the handrails (27), and a controller (21) is fixedly connected to the top of the curved plate (20). The electrical output terminal of the controller (21) is electrically connected to the electrical input terminal of the electric cylinder (9) through a wire.

5. The adjustable seat structure for wheelchairs according to claim 4, characterized in that: The upper surface of the back plate (2) is provided with a slot (22), and a plug plate (23) is inserted into the inner side wall of the slot (22). A headrest (24) is fixedly connected to the top of the plug plate (23).

6. The adjustable seat structure for wheelchairs according to claim 5, characterized in that: The lower surface of the headrest (24) and the upper surface of the back plate (2) are symmetrically fixedly connected with two magnetic blocks (25).

7. The adjustable seat structure for wheelchairs according to claim 6, characterized in that: Two push handles (26) are symmetrically fixedly connected to the upper right side wall of the back plate (2).

8. The adjustable seat structure for wheelchairs according to claim 7, characterized in that: The support plate (11), the wedge plate (12), and the locking teeth (13) are all made of aluminum alloy.

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