Wheelchair with adjustable seat angle

Abstract

The utility model relates to a wheelchair capable of adjusting the angle of a seat, which comprises a base frame and a seat frame, the seat frame is arranged above the base frame and comprises a seat plate frame and a backrest frame, the left side and the right side of the front part of the base frame are respectively provided with a support rod along the vertical direction, and the left side and the right side of the seat plate frame are respectively and rotatably connected with the corresponding support rods. The front part of the base frame is connected with the rear part of the seat plate frame through a telescopic first device, so that an included angle between the seat plate frame and the base frame is adjustable; the rear part of the base frame is lower than the front part of the base frame, so that the rear part of the base frame does not interfere with the angle adjustment of the seat plate frame relative to the base frame, and the range of an included angle between a base frame reference plane and a seat plate frame reference plane is [m, n],-10 degree lt; mlt; mlt; 5 degrees, 40 degree lt; nlt; the temperature is 50 DEG C; the rear portion of the base frame structure is lower than the front portion of the base frame structure, limitation of the wheelchair base to the inclination angle of a seat is reduced, and more space is provided for adjusting the angle of the seat.

Description

Technical Field

[0001] This utility model relates to a wheelchair, and more particularly to a wheelchair seat angle adjustment structure. Background Technology

[0002] Existing wheelchairs generally have a limited range of seat angle adjustment. For example, the wheelchair in patent document TWM322817U is limited by the interference of the base with the seat, resulting in a small adjustable angle between the seat and the base, which cannot meet the special usage requirements of reclining backward and raising the legs at a large angle. To enable the wheelchair to meet these special usage requirements, the wheelchair frame needs to be redesigned to provide sufficient space for the seat to rotate and tilt backward. Utility Model Content

[0003] The technical problem to be solved by this invention is how to design the frame of a wheelchair so that the base of the wheelchair provides sufficient space for the seat to rotate and tilt backward.

[0004] To solve this technical problem, this utility model provides a wheelchair with an adjustable seat angle, including a base frame and a seat frame. The seat frame is located above the base frame and includes a seat plate frame and a backrest frame. A support rod along the vertical direction is provided on the left and right sides of the front part of the base frame. The left and right sides of the seat plate frame are rotatably connected to the corresponding support rods. The front part of the base frame and the rear part of the seat plate frame are connected by a retractable first device, allowing the angle between the seat plate frame and the base frame to be adjustable. The rear part of the base frame is lower than the front part, ensuring that the rear part of the base frame does not interfere with the angle adjustment of the seat plate frame relative to the base frame. The angle range between the reference plane of the base frame and the reference plane of the seat plate frame is [m, n], -10°. <m<5°,40°<n<50°。

[0005] This invention reduces the limitation of the wheelchair base on the seat tilt angle by designing the base frame structure so that the rear is lower than the front, allowing for more space to adjust the seat angle. Attached Figure Description

[0006] Figure 1 A perspective view of an example wheelchair provided by this utility model;

[0007] Figure 2 for Figure 1 The diagram shown is an exploded view of the vehicle frame.

[0008] Figure 3 for Figure 1 A perspective view of the chassis shown;

[0009] Figure 4 for Figure 1 A perspective view of the seat frame of the vehicle shown, tilted at 45°. Detailed Implementation

[0010] Figure 1 A perspective view of an example wheelchair provided by this utility model. See also Figure 1 The wheelchair includes a frame and armrests 10, headrest 20, wheels 30, anti-tipping legs 40, handles 50, etc., mounted on the frame. See also Figure 2 The frame includes a base frame 1 and a seat frame, with the seat frame located above the base frame 1. The seat frame includes a seat plate frame 2 and a backrest frame 3. Wheels 30 and anti-rollover outriggers 40 are mounted on the base frame 1, seat plate 21 and armrests 10 are mounted on the seat plate frame 2, and backrest 31, headrest 20 and handlebars 50 are mounted on the backrest frame 3.

[0011] The base frame 1 includes a left longitudinal bar 11, a right longitudinal bar 12, and a horizontal bar connecting the left longitudinal bar 11 and the right longitudinal bar 12. The left longitudinal bar 11 is arranged in the front-back direction, and the rear part of the left longitudinal bar 11 is lower than the front part of the left longitudinal bar 11. The rear part and the front part of the left longitudinal bar 11 are connected by an oblique part 11S. The angle between the oblique part 11S and the rear part of the left longitudinal bar 11, and the angle between the oblique part 11S and the front part of the left longitudinal bar 11 are obtuse angles (if necessary, they can also be designed as right angles or acute angles). A support rod 111 in the vertical direction is provided on the inner side of the front part of the left longitudinal bar 11. The structure of the right longitudinal bar 12 is mirror-symmetrical to that of the left longitudinal bar 11. A support rod 121 in the vertical direction is provided on the inner side of the front part of the right longitudinal bar 12.

[0012] The upper ends of support rods 111 and 121 are rotatably connected to the seat frame 2. The front part of the base frame 1 and the rear part of the seat frame 2 are connected by a gas spring A (other retractable devices can be used if necessary). The gas spring A has a fixed end and a free end. The free end of the gas spring A is rotatably connected to the seat frame 2, so that the angle V1 between the seat frame 2 and the base frame 1 (i.e., the angle V1 between the reference plane P2 of the seat frame and the reference plane P1 of the base frame, see...) Figure 4 Adjustable. When the included angle V1 is 0°, the reference plane P2 of the base plate frame is parallel to the reference plane P1 of the base frame. See [link / reference]. Figure 3When the angle V1 is greater than 0°, the seat tilts backward, the gas spring A shortens, the angle V1 between the seat frame 2 and the base frame 1 increases, and the seat tilt angle increases; when the gas spring A extends, the angle V1 between the seat frame 2 and the base frame 1 decreases, and the seat tilt angle decreases. When the angle V1 is less than 0°, the seat tilts forward, the gas spring A shortens, the angle V1 between the seat frame 2 and the base frame 1 increases (the absolute value decreases), and the seat tilt angle decreases; when the gas spring A extends, the angle V1 between the seat frame 2 and the base frame 1 decreases (the absolute value increases), and the seat tilt angle increases. Because the rear of the base frame 1 is lower than the front, the rear of the base frame 1 will not interfere with the angle adjustment of the seat frame 2 relative to the base frame 1. As long as the travel of the gas spring A is sufficient, the angle V1 between the seat frame 2 and the base frame 1 can range from -5° to 45° (see...). Figure 4 () can vary arbitrarily between.

[0013] The upper parts of support rods 111 and 121 are connected by a horizontal bar. Considering the specifications of gas spring A, to ensure sufficient travel of gas spring A, the lower parts of support rods 111 and 121 are connected by a "U"-shaped crossbar 13. The "U"-shaped crossbar 13 includes two sides and a middle section. The two ends of the "U"-shaped crossbar 13 are fixed to support rods 111 and 121 respectively. The arching direction of the "U"-shaped crossbar 13 is forward and downward. The fixed end of gas spring A is fixed to the middle section of the "U"-shaped crossbar 13. The wheelchair base includes a base frame 1, two support rods, a horizontal bar connecting the two support rods and the "U"-shaped crossbar 13, a bracket for connecting the wheels 30 and the anti-tipping outriggers 40, etc. The wheelchair seat includes a seat frame, a seat plate 21, a backrest 31, etc.

[0014] The backrest frame 3 is rotatably connected to the seat frame 2, and the backrest frame 3 and the seat frame 2 are connected by a retractable second device B, so that the angle between the backrest frame 3 and the seat frame 2 is adjustable.

[0015] The angle V2 between the seat frame 2 and the backrest frame 3 (i.e., the angle V2 between the seat frame reference plane P2 and the backrest frame reference plane P3, see...) Figure 4 (This is adjustable; see [link]). Figure 2 and 3The backrest frame 3 is rotatably connected to the seat frame 2. The backrest frame 3 and seat frame 2 are connected by a gas spring B (or other retractable device if needed). The gas spring B has a fixed end and a free end. The free end of the gas spring B is rotatably connected to the seat frame 2, allowing the angle V2 between the backrest frame 3 and the seat frame 2 to be adjustable, with an adjustment range of 90° to 135°. When the gas spring B shortens, the angle V2 between the seat frame 2 and the backrest frame 3 increases; when the gas spring B extends, the angle V2 between the seat frame 2 and the backrest frame 3 decreases. By adjusting the angle V1 between the seat frame 2 and the base frame 1, and the angle V2 between the seat frame 2 and the backrest frame 3, a supine position with the thighs raised at 45° can be achieved, meeting the specific needs of patients.

[0016] Figure 1 In the example wheelchair shown, the position of gas spring A is centered, so only one gas spring A is provided. For wheelchairs where gas spring A cannot be centered, if the wheelchair is wide, two gas springs A, one on the left and one on the right, can be provided to ensure the stability of the seat frame 2.

Claims

1. A wheelchair with adjustable seat angle, comprising a base frame (1) and a seat frame, the seat frame being arranged above the base frame (1) and comprising a seat plate frame (2) and a backrest frame (3), characterized in that: The left and right sides of the front part of the base frame (1) are respectively provided with a support rod (111, 121) in the up-down direction, the left and right sides of the seat plate frame (2) are respectively rotationally connected with the corresponding support rod (111, 121), the front part of the base frame (1) and the rear part of the seat plate frame (2) are connected through the first device (A) which is telescopic, so that the included angle between the seat plate frame (2) and the base frame (1) is adjustable; the rear part of the base frame (1) is lower than the front part of the base frame (1), so that the rear part of the base frame (1) does not interfere with the angle adjustment of the seat plate frame (2) relative to the base frame (1), the included angle (V1) between the base frame reference plane (P1) and the seat plate frame reference plane (P2) ranges from [m, n], -10°<m<5°, 40°<n<50°.

2. The wheelchair of claim 1, wherein: The backrest frame (3) is rotationally connected with the seat plate frame (2), and the backrest frame (3) and the seat plate frame (2) are connected through the second device (B) which is telescopic, so that the included angle between the backrest frame (3) and the seat plate frame (2) is adjustable.

3. The wheelchair of claim 1, wherein: The base frame (1) comprises a left longitudinal rod (11) and a right longitudinal rod (12), the left longitudinal rod (11) is arranged in the front-rear direction, the rear part of the left longitudinal rod (11) is lower than the front part of the left longitudinal rod (11), the rear part of the left longitudinal rod (11) is connected with the front part through a slant, the included angle between the slant and the rear part of the left longitudinal rod (11) and the included angle between the slant and the front part of the left longitudinal rod (11) are obtuse angles; the right longitudinal rod (12) is mirror-symmetrically arranged with the left longitudinal rod (11).

4. The wheelchair of claim 3, wherein: The two support rods (111, 121) are respectively arranged inside the left longitudinal rod (11) and the right longitudinal rod (12), the lower parts of the two support rods (111, 121) are connected through a "U"-shaped cross rod (13), the "U"-shaped cross rod (13) comprises two side parts and a middle part; the two ends of the "U"-shaped cross rod (13) are respectively fixed on the two support rods (111, 121), the arching direction of the "U"-shaped cross rod (13) is forward and downward, the first device (A) which is telescopic is a gas spring, having a fixed end and a free end, the fixed end of the first device (A) is fixed on the middle part of the "U"-shaped cross rod, and the free end of the first device (A) is rotationally connected with the seat plate frame (2).

5. The wheelchair of claim 1, wherein: n=45°。

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