Backrest lifting adjusting device of wheelchair

Abstract

The utility model discloses a wheelchair backrest lifting adjusting device which comprises a longitudinal backrest vertical rod and further comprises a sliding lifting head, a vertical through hole is formed in a body of the sliding lifting head, the backrest vertical rod is connected in the vertical through hole in a penetrating mode, and the sliding lifting head can slide up and down relative to the backrest vertical rod to adjust the height. A multi-stage gear adjusting and positioning device is arranged between the inner wall of the vertical through hole and the backrest vertical rod, and is used for adjusting the lifting, positioning and fixing of the sliding lifting head; only one backrest vertical rod is vertically welded and fixed to the middle of the rear portion of the wheelchair frame, the wheelchair is simple in structure and convenient to install, the weight of the whole wheelchair is reduced, then the sliding lifting head is vertically installed on the backrest vertical rod, and lifting of the wheelchair backrest is adjusted by adjusting lifting of the sliding lifting head. The wheelchair backrest with the proper height can be conveniently adjusted according to people of different heights after sitting on the wheelchair, so that better comfort is achieved, and people feel more comfortable when the back is close to the wheelchair backrest, sit more naturally and lie back more comfortably.

Description

Technical Field

[0001] This utility model relates to wheelchair components, and more particularly to a backrest lifting and adjusting device for a wheelchair. Background Technology

[0002] 1. Chinese Patent Publication No. CN218529092U discloses a multifunctional wheelchair with an adjustable backrest angle. This product has corresponding front and rear wheels installed at the bottom of the left and right sides of the front and rear legs. A seat frame is hinged to the top of the front and / or rear legs, and the seat board is fixedly connected to the seat frame. A hinged folding support device is hinged to the rear legs. The backrest includes a lower backrest frame, an upper backrest frame, and a backrest cushion. The upper backrest frame is fixedly connected to the backrest cushion, and the upper backrest frame is connected to the lower backrest frame. The frames are hinged together. The upper backrest frame is based on the lower backrest frame and can be tilted back to adjust the backrest angle from 0 to 45 degrees. The left and right rear sides of the seat frame are hinged to the upper left and right sides of the lower backrest frame. The bottom of the lower backrest frame is movably connected to the hinged folding support device. There is a backrest angle adjustment and positioning support device hinged between the upper and lower backrest frames. Users can adjust the upper backrest frame to a suitable tilting angle to suit their needs, making it more comfortable to sit in the wheelchair. When tired, they can lie down to rest.

[0003] The backrest of the aforementioned wheelchair can only be adjusted to tilt forward and backward, but cannot be adjusted to raise or lower the backrest, nor can it be adjusted to accommodate the comfort of people of different heights and weights sitting in the wheelchair seat with their backs against the backrest.

[0004] 2. Chinese Patent Publication No. CN205698292U discloses a height-adjustable backrest for a wheelchair, including a backrest cushion. A serpentine spring is provided on the rear surface of the backrest cushion. A backrest frame is provided behind the backrest cushion, and the backrest cushion is fixed to the backrest frame by fixing nails. A crossbar is provided on the backrest frame, and a telescopic rod and a cylinder are provided below the crossbar. The upper end of the telescopic rod is connected to the crossbar by bolts. A push rod is provided inside the cylinder, and the upper end of the push rod is connected to the crossbar by bolts. The lower ends of the telescopic rod and the cylinder are fixed to the wheelchair frame. Simultaneously, the cylinder drives the crossbar to move up and down via the push rod, which in turn drives the backrest cushion to move up and down vertically. The telescopic rod, in coordination with the crossbar, extends and retracts vertically. During the switching between a sitting and standing position in the standing wheelchair, the backrest cushion remains in close contact with the user's back, providing support.

[0005] The above-disclosed backrest lifting and adjusting device for a wheelchair has a complex structure, is troublesome to manufacture and assemble, has high production costs, increases the weight of the wheelchair, and is inconvenient to adjust. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a backrest lifting and adjusting device for wheelchairs with a reasonable structural design that facilitates overall adjustment of the backrest height and positioning.

[0007] The solution to the above technical problem is as follows:

[0008] A wheelchair backrest height adjustment device includes a longitudinally arranged backrest vertical bar and a sliding lifting head. The body of the sliding lifting head has a vertical through hole, through which the backrest vertical bar passes. The sliding lifting head can slide up and down relative to the backrest vertical bar. A multi-level adjustment and positioning device is provided between the inner wall of the vertical through hole and the backrest vertical bar. The multi-level adjustment and positioning device is used to adjust the height adjustment and positioning of the sliding lifting head.

[0009] The beneficial effects of this utility model of a wheelchair backrest height adjustment device are as follows: 1. This product uses only one backrest vertical rod, which is vertically welded and fixed to the middle of the rear of the wheelchair frame. Its structure is simple, easy to install, and reduces the overall weight of the wheelchair. A sliding lifting head is then vertically installed on the backrest vertical rod. Adjusting the height of the sliding lifting head adjusts the height of the wheelchair backrest, allowing for easy adjustment to a suitable height for people of different heights, achieving better comfort. The back of the person sitting in the wheelchair is more comfortable against the backrest, resulting in a more natural sitting posture and a more comfortable reclining position. The height of the sliding lifting head can be adjusted manually using a multi-level adjustable positioning device, making operation easy. 2. Due to the simplified structure, the weight of the wheelchair is reduced, making it easier to carry and transport. Attached Figure Description

[0010] Figure 1 , Figure 2 This is a perspective view of the product of this utility model;

[0011] Figure 3 This is an exploded view of the backrest vertical bar and sliding lifting head of the present utility model product;

[0012] Figure 4 This is a side view of the product of this utility model;

[0013] Figure 5 yes Figure 4 A sectional view along the AA direction;

[0014] Figure 6 This is a cross-sectional view of the product of this utility model;

[0015] Figure 7 yes Figure 5 Enlarged view of point A;

[0016] Figure 8 yes Figure 6 Enlarged view of point B;

[0017] Figure 9 This is a cross-sectional view of the product of this utility model with a screw;

[0018] Figure 10 , Figure 11 This is a perspective view of the sliding lifting head and backrest connecting seat of the present utility model.

[0019] Figure 12 , Figure 13 This is an exploded view of the product of this utility model;

[0020] Figure 14 This is a side view of the product of this utility model with a wheelchair backrest.

[0021] 1. Backrest vertical rod; 2. Sliding lifting head; 21. Vertical through hole; 201. Left and right support plates; 3. Multi-level gear adjustment and positioning device; 31. Multi-level high and low gear holes; 32. Positioning device fixing hole; 33. Gear positioning device; 301. Ball seat; 3A. Ball hole; 302. Round ball; 303. Return spring; 33A. Screw; 4. Backrest connecting seat; 401. Hinge shaft; 402. Torsion spring fixing shaft; 41. Backrest connecting plate; 42. Connector; 5. Torsion spring assembly; 6. Wheelchair backrest; 7. Lower limit component; 8. Upper limit component. Detailed Implementation

[0022] like Figures 1 to 14 A wheelchair backrest height adjustment device includes a longitudinally arranged backrest vertical rod 1, which is made of steel pipe, has high rigidity, and a height of 50 cm to 80 cm. The device also includes a sliding lifting head 2, which is made of plastic. The sliding lifting head 2 has a vertical through hole 21, through which the backrest vertical rod 1 passes. The shape of the vertical through hole 21 matches the shape of the backrest vertical rod 1 perfectly. The sliding lifting head 2 can slide up and down relative to the backrest vertical rod 1 to adjust its height. A multi-level adjustment and positioning device 3 is provided between the inner wall of the vertical through hole 21 and the backrest vertical rod 1. Device 3 is used to adjust the lifting and positioning of the sliding lifting head 2. The above-mentioned single backrest vertical rod 1 is vertically welded and fixed to the middle of the rear of the wheelchair frame. Its product structure is simple, easy to install, and reduces the weight of the whole vehicle. Then, the sliding lifting head 2 is vertically installed on the backrest vertical rod 1. The lifting and lowering of the wheelchair backrest 6 is adjusted by adjusting the lifting and lowering of the sliding lifting head 2. This allows for easy adjustment of the wheelchair backrest 6 to a suitable height for people of different heights after they sit in the wheelchair, so as to achieve better comfort. It is more comfortable for the person's back to be against the wheelchair backrest 6, so that sitting is more natural and reclining is more comfortable. The lifting and lowering of the sliding lifting head 2 can be adjusted by manually operating the multi-level adjustment positioning device 3, which is easy to operate.

[0023] Preferably, the multi-level gear adjustment and positioning device 3 includes multi-level high and low gear holes 31, positioning device fixing holes 32, and gear positioning devices 33. The multi-level high and low gear holes 31 are vertically opened on the side wall of the backrest vertical rod 1, and there is at least one row of multi-level high and low gear holes 31, generally five to ten holes, forming several levels of high and low adjustment gear holes. The positioning device fixing holes 32 are opened in the wall of the sliding lifting head 2 and can be designed to be horizontally through. The gear positioning devices 33 can be embedded in the positioning device fixing holes 32 by means of a threaded structure or fixedly connected by a screw assembly. The inner end of the gear positioning devices 33 is inserted into the positioning device fixing holes 32. The height of the sliding lifting head 2 is fixed within the multi-level high and low gear holes 31 at different heights. When raising the sliding lifting head 2, simply hold it and pull it upwards. The sliding lifting head 2 can slide past the inner end of the gear positioning device 33. When the appropriate height is reached, release the sliding lifting head 2. The inner end of the gear positioning device 33 will automatically slide into / insert into the corresponding multi-level high and low gear hole 31, thus fixing the height of the sliding lifting head 2 and preventing it from falling naturally. The multi-level gear adjustment positioning device 3 is simple in structure, easy to set up, easy to operate, durable, and low in cost.

[0024] Preferably, the gear positioning device 33 is a metal ball bearing device. The metal ball bearing device is embedded and fixed to the inner end of the positioning device fixing hole 32 by a threaded structure. The round ball bearing 302 of the metal ball bearing device protrudes from the vertical through hole 21. The protruding round ball bearing 302 of the metal ball bearing device is inserted into the multi-level high and low gear holes 31 of different heights to position and fix the adjusted height of the sliding lifting head 2. The round ball bearing 302 of the metal ball bearing device makes it easy for the sliding lifting head 2 to slide over the multi-level high and low gear holes 31 of different heights when it is raised or lowered, making it easier to skip gears.

[0025] Preferably, the metal ball bearing device includes a ball bearing seat 301 and round balls 302. The ball bearing seat 301 is made of steel and integrally formed. A ball bearing hole 3A is formed on the end face of the ball bearing seat 301. The ball bearing hole 3A is integrally formed with the ball bearing seat 301. Round balls 302 are movably placed at the ball bearing hole 3A. The round balls 302 are made of steel, with 30%–40% protruding from the vertical through hole 21 and 60%–70% placed within the ball bearing hole 3A. Most of the round balls 302… The ball is embedded in the ball hole 3A to maintain the stability of sliding and preventing it from falling off; that is, 30% to 40% of the protruding round ball 302 body falls into / inserts into the multi-level high and low gear holes 31, which can fix the sliding lifting head 2 in position. When adjusting the lifting, the sliding lifting head 2 can be pulled up or lowered with a little force. The above-mentioned metal ball device is easy to manufacture and assemble, has good sliding performance, and the round ball will not cause wear to the backrest vertical rod 1.

[0026] Preferably, a return spring 303 is clamped between the inner bottom wall of the ball bearing hole 3A and the round ball bearing 302. The return spring 303 always pushes the round ball bearing 302 out, so that the round ball bearing 302 falls into / inserts into the multi-level high and low gear holes 31 more effectively. Even if it is a little loose after long-term use, it will not affect the performance.

[0027] Preferably, another gear positioning device 33 structure can also be implemented, which is simple and easy to operate. The gear positioning device 33 is a screw 33A. The screw 33A is L-shaped for easy screwing. The screw 33A is screwed into the positioning device fixing hole 32. When the screw 33A is screwed in, its inner end is inserted into the multi-level high and low gear holes 31 at different heights to position and fix the height of the sliding lifting head 2 after adjustment. When the screw 33A is screwed out, its inner end is disengaged from the multi-level high and low gear holes 31, and the sliding lifting head 2 can be adjusted for lifting.

[0028] Preferably, the front wall of the sliding lifting head 2 is movably connected to a backrest connecting seat 4 via a hinge shaft 401. The backrest connecting seat 4 can only be rotated back and forth relative to the sliding lifting head 2 to facilitate adjustment of the tilt angle of the wheelchair backrest 6, so as to suit the backrest movement of different people; because some people's backs are wider and flatter, some are narrower and flatter, and some are more rounded; this makes the backrest more comfortable.

[0029] Preferably, a torsion spring assembly 5 is clamped between the sliding lifting head 2 and the backrest connecting seat 4, so that the backrest connecting seat 4 has automatic reset elasticity, eliminating the need for manual reset and saving time and effort in adjustment.

[0030] Preferably: the left and right sides of the front wall of the sliding lifting head 2 are integrally extended with connecting left and right support plates 201, and the left and right support plates 201 are integrally formed with the sliding lifting head 2; the backrest connecting seat 4 is integrally formed; the backrest connecting seat 4 includes a backrest connecting plate 41 and a connector 42, the backrest connecting plate 41 has an integrally extended and fixed connector 42, the connector 42 is inserted into the U-shaped opening between the left and right support plates 201, fits perfectly, prevents left and right deviation, and is centrally positioned, the hinge shaft 401 passes through the left and right support plates 201. The ear plate 201 and the connector 42 enable the backrest connecting seat 4 to be movably connected to the sliding lifting head 2. The backrest connecting seat 4 is rotated back and forth relative to the sliding lifting head 2 based on the hinge shaft 401. The sliding lifting head 2 is fixed with a torsion spring fixing shaft 402. The two ends of the hinge shaft 401 are connected and fixed with the torsion spring assembly 5. One end of the torsion spring assembly 5 is pressed and connected to the backrest connecting plate 41, and the other end is fixedly connected to the torsion spring fixing shaft 402, thereby making the backrest connecting seat 4 elastic and able to automatically reset.

[0031] Preferably, the front wall of the backrest connecting plate 41 is connected to the wheelchair backrest 6 via a screw assembly.

[0032] Preferably, the vertical through hole 21 and the backrest vertical rod 1 are non-circular to prevent the sliding lifting head 2 from rotating circumferentially, and the sliding lifting head 2 can only achieve lifting adjustment.

[0033] Preferably, the vertical through hole 21 and the backrest vertical rod 1 are polygonal, and the polygon is not circular. For example, a square shape. This has corners, which prevents the sliding lifting head 2 from rotating circumferentially. The sliding lifting head 2 can only slide up and down, and the positioning effect of the sliding lifting head 2 can only achieve lifting adjustment is better.

[0034] Preferably, the lower section or bottom of the backrest vertical rod 1 is fixed with a lower limit member 7. When the sliding lifting head 2 descends and presses against the lower limit member 7, the downward movement is stopped to prevent excessive sliding. The lower limit member 7 is a lower limit horizontal nail, which passes through the body of the backrest vertical rod 1 for fixation.

[0035] Preferably, the upper section or top of the backrest vertical rod 1 is fixed with an upper limit stop 8. When the sliding lifting head 2 rises and presses against the upper limit stop 8, the upward movement is stopped to prevent excessive rise and dislodgement. The upper limit stop 8 is an upper limit horizontal nail, which passes through the body of the backrest vertical rod 1 for fixation.

Claims

1. A backrest height adjustment device for a wheelchair, comprising a longitudinally arranged backrest vertical bar, characterized in that: It also includes a sliding lifting head, the body of which has a vertical through hole, through which the backrest vertical rod passes. The sliding lifting head can slide up and down relative to the backrest vertical rod to adjust its height. A multi-level adjustment and positioning device is provided between the inner wall of the vertical through hole and the backrest vertical rod. The multi-level adjustment and positioning device is used to adjust the lifting and positioning of the sliding lifting head.

2. The backrest height adjustment device for a wheelchair according to claim 1, characterized in that: The multi-level gear adjustment and positioning device includes multi-level high and low gear holes, positioning device fixing holes, and gear positioning devices. The multi-level high and low gear holes are vertically opened on the side wall of the backrest vertical rod, and the positioning device fixing holes are opened on the wall of the sliding lifting head. The gear positioning device is connected inside the positioning device fixing holes. The inner end of the gear positioning device is inserted into the multi-level high and low gear holes of different heights to position and fix the height of the sliding lifting head after adjustment.

3. The backrest height adjustment device for a wheelchair according to claim 2, characterized in that: The gear positioning device is a metal ball bearing device. The metal ball bearing device is fixed inside the fixing hole of the positioning device. The round ball part of the metal ball bearing device protrudes from the vertical through hole. The protruding round ball part of the metal ball bearing device is inserted into the multi-level high and low gear holes of different heights to position and fix the height after the sliding lifting head is adjusted.

4. The backrest height adjustment device for a wheelchair according to claim 3, characterized in that: The metal ball bearing device includes a ball bearing seat and round balls. The end face of the ball bearing seat has a ball bearing hole, and a round ball bearing is movably placed in the ball bearing hole. 30% to 40% of the round ball bearing protrudes from the vertical through hole, and 60% to 70% is placed inside the ball bearing hole.

5. The backrest height adjustment device for a wheelchair according to claim 4, characterized in that: A return spring is clamped between the bottom wall of the ball bearing hole and the perfectly round ball bearing.

6. The backrest height adjustment device for a wheelchair according to claim 2, characterized in that: The gear positioning device is a screw rod, which is screwed into the fixing hole of the positioning device. The screw rod is screwed inward, and its inner end is inserted into the multi-level high and low gear holes of different heights to fix the height after the sliding lifting head is adjusted.

7. A backrest height adjustment device for a wheelchair according to any one of claims 1 to 6, characterized in that: The front wall of the sliding lifting head is movably connected to a backrest connecting seat via a hinge shaft. The backrest connecting seat can only be rotated back and forth relative to the sliding lifting head.

8. The backrest height adjustment device for a wheelchair according to claim 7, characterized in that: A torsion spring assembly is clamped between the sliding lifting head and the backrest connecting seat, giving the backrest connecting seat automatic reset elasticity.

9. The backrest height adjustment device for a wheelchair according to claim 8, characterized in that: The front wall of the sliding lifting head has integral left and right side extensions for connecting left and right support plates; the backrest connecting seat is integrally formed; the backrest connecting seat includes a backrest connecting plate and a connector, the backrest connecting plate extends and is fixed to the connector, the connector is inserted between the left and right support plates, and the hinge shaft passes through the left and right support plates and the connector, so that the backrest connecting seat is movably connected to the sliding lifting head; the sliding lifting head has a torsion spring fixing shaft fixed through it; the two ends of the hinge shaft are connected and fixed to the outer sides to the torsion spring assembly, one end of the torsion spring foot is pressed and connected to the backrest connecting plate, and the other end is fixedly connected to the torsion spring fixing shaft.

10. A backrest lifting and adjusting device for a wheelchair according to any one of claims 1 to 6, characterized in that: The vertical through hole and the backrest vertical rod are non-circular; the vertical through hole and the backrest vertical rod are polygonal, and the polygonal is non-circular; a lower limit member is fixed to the lower section or bottom of the backrest vertical rod; an upper limit member is fixed to the upper section or top of the backrest vertical rod.

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