Wheelchair with adjustable seat angle
By improving the wheelchair base frame structure and using gas springs to achieve multi-angle seat adjustment, the problem of limited angle adjustment range in existing wheelchair seats has been solved, meeting special usage needs.
Patent Information
- Application Number
- CN202422739918.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Existing wheelchair seats have a small angle adjustment range, which cannot meet special usage needs such as reclining backwards and raising the legs at a large angle.
Design a wheelchair with an adjustable seat angle by improving the base frame structure, offsetting the rear of the left and right longitudinal bars, increasing the rotation space between the seat and the base, and using gas springs to achieve multi-angle adjustment of the seat frame.
The seat angle is fully adjustable to meet the special posture needs of wheelchair users, such as lying flat and raising their thighs, thus avoiding the risk of interference and pinching.
Smart Images
Figure CN223464213U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a wheelchair, in particular to a wheelchair seat angle adjusting structure. BACKGROUND
[0002] The seat angle of the existing wheelchair is generally small, for example, the wheelchair in the patent document TWM322817U, the seat angle is small relative to the base due to the interference of the base to the seat, which cannot meet the special use requirement of lying back and lifting the legs at a large angle. In order to meet the special use requirement of the wheelchair, the frame of the wheelchair needs to be redesigned to provide sufficient space for the seat to tilt back. SUMMARY
[0003] The utility model solves the technical problem of how to design the frame of the wheelchair to provide sufficient space for the seat to tilt back.
[0004] To solve the technical problem, the utility model provides a wheelchair capable of adjusting the seat angle, 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 base frame comprises a left vertical rod, a right vertical rod and a plurality of horizontal rods connecting the left vertical rod and the right vertical rod, the horizontal rods are arranged along the left-right direction; the left vertical rod and the right vertical rod are arranged along the front-back direction and comprise a front part, an inclined part and a rear part arranged in sequence from front to back, the rear part is staggered with the front part along the left-right direction, is connected through the inclined part, and is located outside the front part, the distance between the rear part of the left vertical rod and the rear part of the right vertical rod is wider than the distance between the front part of the left vertical rod and the front part of the right vertical rod, so that the rear parts of the left vertical rod and the right vertical rod do not interfere with the angle adjustment of the seat plate frame relative to the base frame; the front parts of the left vertical rod and the right vertical rod are respectively fixedly connected with a support, the left and right sides of the seat plate frame are respectively rotationally connected with the corresponding supports, and the front part of the base frame and the rear part of the seat plate frame are connected through a telescopic first device, so that the included angle between the seat plate frame and the base frame is adjustable; the included 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° and 40° < n < 50°.
[0005] The utility model designs the base frame structure into the rear part wider than the front part, reduces the restriction of the wheelchair base on the seat tilt angle, and makes the seat angle adjustment have more space. BRIEF DESCRIPTION OF DRAWINGS
[0006] Figure 1 A perspective view of the wheelchair provided by the utility model is shown, in which the headrest, handle and the like are hidden behind;
[0007] Figure 2 A perspective view of the wheelchair provided by the utility model is shown, in which the headrest, handle and the like are hidden behind; Figure 1
[0008] Figure 3 For Figure 2 the left side baffle and the corresponding fixed parts are shown in the exploded view;
[0009] Figure 4 For Figure 2 the wheelchair hidden baffle, fixed parts, etc. are shown in the perspective view;
[0010] Figure 5 For Figure 4 the seat frame of the wheelchair is shown in the perspective view of 45° inclination. DETAILED DESCRIPTION
[0011] Figure 1 For the utility model provides a wheelchair example hidden headrest (for the device of wheelchair rider headrest), handle (for the device of pushing wheelchair person hand holds) etc. after the perspective view. In addition to headrest, handle, etc., see Figure 1 , the wheelchair also includes a frame and a handrail 100, wheels 200, anti-rollover legs 300 installed on the frame.
[0012] See Figure 2 , the frame includes a base frame 1 and a seat frame, the seat frame is located above the base frame 1, and the seat frame includes a seat plate frame 2 and a backrest frame 3. The wheels 200 and the anti-rollover legs 300 are installed on the base frame 1, the seat plate 400 and the handrail 100 are installed on the seat plate frame 2, and the backrest 500, the headrest and the handle are installed on the backrest frame 3.
[0013] The angle V2 between the seat plate frame 2 and the backrest frame 3 (i.e. the angle V2 between the seat plate frame reference plane P2 and the backrest frame reference plane P3, see Figure 5 ) can be adjusted, see Figure 2 , the backrest frame 3 is rotatably connected with the seat plate frame 2. The backrest frame 3 and the seat plate frame 2 are connected by a gas spring B (which is one of the embodiments of the second device, and other extendable devices can be used instead if necessary), the gas spring B has a fixed end and a free end, a triangular structure mounting seat 21 is arranged at the middle position of the lower side of the front part of the seat plate frame 2, the fixed end of the gas spring B is fixedly connected with the lower end of the backrest frame 3, and the free end of the gas spring B is rotatably connected with the mounting seat 21, so that the angle V2 between the backrest frame 3 and the seat plate frame 2 can be adjusted, and the adjustment range is 90° to 135°. When the gas spring B is shortened, the angle V2 between the seat plate frame 2 and the backrest frame 3 becomes larger; when the gas spring B is lengthened, the angle V2 between the seat plate frame 2 and the backrest frame 3 becomes smaller.
[0014] The base frame 1 comprises a left vertical rod 11, a right vertical rod 12, and two lateral rods connecting the left vertical rod 11 and the right vertical rod 12, the two lateral rods are arranged in front and back, and are located at the front of the base frame 1, the frontmost lateral rod is a front lateral rod 13, and a support 14 for connecting the wheel 200 and the anti-rollover support leg 300 is fixed at the rear of the base frame 1.
[0015] The left vertical rod 11 and the right vertical rod 12 are both arranged in front and back, and comprise a front part, an inclined part and a rear part arranged in sequence from front to back, the rear part is staggered with the front part in left and right directions, the rear part is located more outward than the front part, the rear part is connected with the front part through the inclined part, the included angle between the inclined part and the rear part and the included angle between the inclined part and the front part are obtuse angles (if necessary, they can also be designed as right angles or acute angles). The right vertical rod 12 is mirror-symmetrically arranged with the left vertical rod 11, the inclined part 11S of the left vertical rod 11 and the inclined part 12S of the right vertical rod 12 form a “ / \” structure, so that the distance between the rear part of the left vertical rod 11 and the rear part of the right vertical rod 12 is wider than the distance between the front part of the left vertical rod 11 and the front part of the right vertical rod 12, and the rear parts of the left vertical rod 11 and the right vertical rod 12 do not interfere with the angle adjustment of the seat frame 2 relative to the base frame 1.
[0016] A support 111 is fixed on the upper side of the front part of the left vertical rod 11, and a support 121 is fixed on the upper side of the front part of the right vertical rod 12, the upper ends of the supports 111 and 121 are rotationally connected with the seat frame 2. Considering that the wheelchair is relatively wide, the front part of the base frame 1 and the rear part of the seat frame 2 are connected by two gas springs A (if necessary, other extendable devices can also be used instead), and the two gas springs A are respectively located on the left and right sides of the gas spring B. If the width of the wheelchair is relatively narrow, only one gas spring A can be arranged on the left side or the right side of the gas spring B.
[0017] Considering the specifications of the gas spring A, in order to make the stroke of the gas spring A sufficient, a left and right connecting part 131 is arranged on the front lower side of the front lateral rod 13, the connecting part 131 extends to the front lower side of the front lateral rod 13, the gas spring A has a fixed end and a free end, the fixed end of the gas spring A is fixed on the rear part of the seat frame 2, and the free end of the gas spring A is rotationally connected with the corresponding connecting part 131 of the front lateral rod 13, so that the included angle V1 between the seat frame 2 and the base frame 1 (i.e. the included angle V1 between the seat frame reference plane P2 and the base frame reference plane P1, see Figure 5 ) can be adjusted. When the included angle V1 is 0°, the seat frame reference plane P2 is parallel to the base frame reference plane P1, see Figure 4When the included angle V1 is greater than 0°, the seat is inclined backward, the gas spring A is shortened, the included angle V1 between the seat plate frame 2 and the base frame 1 is increased, and the inclination angle of the seat is increased; the gas spring A is elongated, the included angle V1 between the seat plate frame 2 and the base frame 1 is decreased, and the inclination angle of the seat is decreased. When the included angle V1 is less than 0°, the seat is inclined forward, the gas spring A is shortened, the included angle V1 between the seat plate frame 2 and the base frame 1 is increased (the absolute value is decreased), and the inclination angle of the seat is decreased; the gas spring A is elongated, the included angle V1 between the seat plate frame 2 and the base frame 1 is decreased (the absolute value is increased), and the inclination angle of the seat is increased.
[0018] Because the rear part of the base frame 1 is located more outward than the front part of the base frame 1, 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, and the included angle V1 between the seat plate frame 2 and the base frame 1 can be changed between -5° and 45° (see Figure 5 ) at will. By adjusting the included angle V1 between the seat plate frame 2 and the base frame 1 and the included angle V2 between the seat plate frame 2 and the back frame 3, the posture of the wheelchair occupant with the upper body lying and the thighs raised by 45° can be achieved, and the special needs of patients can be met.
[0019] To prevent the hands of the wheelchair occupant from being placed into the gap G between the seat plate frame 2 and the base frame 1 and being pinched during the rotation of the seat plate frame 2 relative to the base frame 1, the rear part of the left vertical rod 11 is provided with a baffle 112 extending upward from the left vertical rod 11, and the rear part of the right vertical rod 12 is provided with a baffle 122 extending upward from the right vertical rod 12. The wheelchair base comprises the base frame 1, two support members, two baffles, a bracket 14, etc., and the wheelchair seat comprises a seat frame, a seat plate 400, a back 500, etc.
[0020] Taking the left baffle 112 as an example, to solve the fixing problem of the baffle, referring to Figure 3 , the rear end of the left vertical rod 11 is provided with a limiting slot C1, and the rear end of the baffle 112 is inserted into the limiting slot C1 from the rear to the front, and the limiting slot C1 is used to prevent the rear end of the baffle 112 from moving forward, left and right. The support member 111 is provided with a limiting through hole H1 in the left-right direction, the front end of the baffle 112 is located inside the support member 111, the outside of the support member 111 is provided with a fixing member 113, the fixing member 113 is inserted into the limiting through hole H1, and the front end of the baffle 112 and the fixing member 113 are locked and fixed by a fastener (a bolt and a nut). When the baffle 112 is installed, the rear end of the baffle 112 is first inserted into the limiting slot C1, and then the front end of the baffle 112 and the fixing member 113 are locked with the support member 111 by the bolt and the nut. The fixing mode of the right baffle 122 is the same as that of the left baffle 112, the rear end of the right vertical rod 12 is provided with a limiting slot for preventing the rear end of the baffle 122 from moving forward, left and right, the support member 121 is provided with a limiting through hole H2, and the outside of the support member 121 is provided with a fixing member 123.
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 base frame (1) comprises a left vertical rod (11), a right vertical rod (12) and a plurality of horizontal rods connecting the left vertical rod (11) and the right vertical rod (12), the horizontal rods are arranged along the left-right direction; the left vertical rod (11) and the right vertical rod (12) are both arranged along the front-rear direction, comprising a front part, an inclined part and a rear part arranged in sequence from front to rear, the rear part is staggered with the front part along the left-right direction, connected through the inclined part, the rear part is located outside the front part, the distance between the rear part of the left vertical rod (11) and the rear part of the right vertical rod (12) is wider than the distance between the front part of the left vertical rod (11) and the front part of the right vertical rod (12), so that the rear part of the left vertical rod (11) and the right vertical rod (12) will not interfere with the angle adjustment of the seat frame (2) relative to the base frame (1); the front part of the left vertical rod (11) and the front part of the right vertical rod (12) are respectively fixedly connected with a support (111, 121), the left and right sides of the seat frame (2) are respectively rotatably connected with the corresponding support (111, 121), the front part of the base frame (1) and the rear part of the seat frame (2) are connected through the first stretchable device (A), so that the included angle between the seat frame (2) and the base frame (1) is adjustable; the included angle (V1) between the base frame reference plane (P1) and the seat frame reference plane (P2) ranges from [m, n], -10°<m<5°, 40°<n<50°.
2. The wheelchair of claim 1, wherein: The rear part of the left vertical rod (11) and the rear part of the right vertical rod (12) are respectively provided with a baffle (112, 122), the baffle (112, 122) extends upward from the base frame (1), which is used to prevent the wheelchair occupant's hand from being put into the gap between the seat frame (2) and the base frame (1), causing the hand to be injured during the rotation of the seat frame (2) relative to the base frame (1).
3. The wheelchair of claim 2, wherein: The rear end of the left vertical rod (11) and the rear end of the right vertical rod (12) are both provided with a limiting slot, the rear end of the baffle (112, 122) is inserted into the corresponding limiting slot from rear to front, the limiting slot is used to prevent the rear end of the baffle (112, 122) from moving forward, left and right; the support (111, 121) is provided with a limiting through hole (H1, H2) along the left-right direction, the front end of the baffle (112, 122) is located inside the support (111, 121), the outside of the support (111, 121) is provided with a fixing member (113, 123), the fixing member (113, 123) is inserted into the corresponding limiting through hole (H1, H2), the front end of the baffle (112, 122) and the corresponding fixing member (113, 123) are locked and fixed by a fastener.
4. The wheelchair of claim 1, wherein: The backrest frame (3) is rotatably connected with the seat frame (2), the backrest frame (3) and the seat frame (2) are connected through the second stretchable device (B), so that the included angle between the backrest frame (3) and the seat frame (2) is adjustable.
5. The wheelchair of claim 4, wherein: The second stretchable device (B) is a gas spring, the seat frame (2) is provided with a triangular mounting seat (21) at the middle position of the lower side of the front part, the free end of the second device (B) is rotatably connected with the mounting seat (21), and the fixed end of the second device (B) is fixedly connected with the lower end of the backrest frame (3).
6. The wheelchair of claim 5, wherein: The first retractable device (A) is an air spring, and the number is two, which are respectively located on the left and right sides of the second device (B); the plurality of horizontal rods include a front horizontal rod (13) located at the most front position; the front lower side of the front horizontal rod (13) is provided with a left and right two connecting parts, the connecting parts extend to the front lower side of the front horizontal rod (13), the fixed ends of the two first devices (A) are respectively fixed on the seat plate frame (2), and the free ends of the two first devices (A) are respectively rotationally connected with a connecting part.
7. The wheelchair of claim 1, wherein: n=45°。
Citation Information
Patent Citations
Wheelchair capable of adjusting angle of seat
TWM322817U