Wheelchair with adjustable backrest

Abstract

The utility model discloses a wheelchair with an adjustable backrest, and relates to the technical field of wheelchairs. The seat comprises a seat frame, a seat plate, a backup plate, auxiliary cross rods and auxiliary supporting legs, main wheels are hinged to the front end and the rear end of one side of the seat frame respectively, sleeve rods for stretching the auxiliary cross rods are fixed to the middles of the front side and the rear side of the seat frame respectively, and the auxiliary supporting legs are fixed to the outer side ends of the auxiliary cross rods respectively. Two auxiliary supporting legs are fixed on one side of the seat frame, auxiliary wheels are fixed on the two auxiliary supporting legs and the front side and the rear side of the other side of the seat frame, a supporting plate is fixed on the tops of the auxiliary supporting legs, and a rubber pad making contact with the surface of the backup plate is fixed on the surface of the supporting plate. In addition, due to the existence of the auxiliary cross rod, the auxiliary supporting legs and the auxiliary wheels, even if the backup plate is adjusted to be a horizontal device, the stability of the device is improved, and a good supporting effect can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchairs, specifically, it relates to a wheelchair with an adjustable backrest. Background Technology

[0002] Wheelchairs are important mobility tools for the home rehabilitation, transportation, medical treatment, and outdoor activities of the injured, sick, and disabled. Wheelchairs not only meet the needs of people with limb disabilities and mobility impairments, 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.

[0003] Existing wheelchairs have limited backrest adjustment angles. When adjusted to a horizontal position, the wheelchair cannot maintain balance and is prone to tipping over, which is not conducive to user operation. Therefore, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a wheelchair with an adjustable backrest.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0006] An adjustable backrest wheelchair includes a seat frame, a seat plate, a backrest, auxiliary crossbars, and auxiliary legs. The seat frame has main wheels hinged to the front and rear ends on one side. Sleeves for extending the auxiliary crossbars are fixed in the middle of the front and rear sides of the seat frame. An auxiliary leg is fixed to the outer end of each auxiliary crossbar. Auxiliary wheels are fixed to the two auxiliary legs and the other front and rear sides of the seat frame. A support plate is fixed to the top of the auxiliary legs. A rubber pad that contacts the surface of the backrest is fixed to the surface of the support plate.

[0007] A seat plate is fixedly installed on the upper end of the seat frame. A kit for mounting the front and rear shafts of the backrest is fixed on one side of the upper end of the seat frame. The surface of the kit is provided with positioning holes for spring pins to be inserted at equal intervals. The surface of the backrest is provided with fixing holes for spring pins to be inserted.

[0008] The other side of the seat frame is also fixedly installed with L-shaped armrest movable connecting sleeves at both the front and rear ends, and a housing and controller are also fixed at the lower end of the seat frame.

[0009] Optionally, the top of the backrest is provided with a cavity for pulling out the J-shaped plate, and a limiting bolt for fixing the length of the J-shaped plate is threadedly connected to the upper outer side of the backrest. The upper ends of the J-shaped plate, the seat plate and the L-shaped armrest are all fitted with sponge pads via Velcro.

[0010] Optionally, the vertical end of the L-shaped handrail has a guide groove in the middle for the guide block to pass through. The guide block is fixedly installed in the middle of the sleeve block, and a fixing bolt for fixing the vertical end of the L-shaped handrail is threadedly connected to one side of the sleeve block.

[0011] Optionally, a positioning bolt for fixing the extension length of the auxiliary crossbar is threaded to one side of the upper end of the sleeve rod. A tapered part is rotatably connected to the bottom end of the positioning bolt through a bearing. Limiting holes that are adapted to the external dimensions of the tapered part are opened at equal intervals on the surface of the auxiliary crossbar. A strip groove for the guide rod to pass through is opened in the middle of the auxiliary crossbar, and the guide rod is fixedly installed inside the sleeve rod.

[0012] Optionally, the sleeve rod is provided with a strip-shaped telescopic airbag inside. One end of the strip-shaped telescopic airbag is connected to the delivery end of the first electromagnetic three-way valve through an air nozzle. One injection end of the first electromagnetic three-way valve is connected to the three-way pipe through the inside of the chassis via a first conduit. The bottom of the three-way pipe is connected to the delivery end of a small air pump inside the chassis. The negative pressure end of the small air pump is connected to the filter pipe at the bottom of the chassis through a pipe. The other end of the strip-shaped telescopic airbag is fixed to the side end of the auxiliary crossbar.

[0013] Optionally, a cross plate is fixed to one side of the seat frame, and a fan-shaped telescopic airbag is provided between the cross plate and the backrest. The air nozzle of the fan-shaped telescopic airbag is connected to a second electromagnetic three-way valve. One of the air injection ends of the second electromagnetic three-way valve passes through a second conduit into the interior of the chassis and is connected to the other end of the three-way pipe. Both the strip-shaped telescopic airbag and the fan-shaped telescopic airbag are connected to a pressure sensor through pipes, and the pressure sensor is connected to the controller through wires.

[0014] Optionally, the upper end of the filter tube is provided with threads that match the screw holes at the bottom of the chassis. Air inlets for air circulation are provided in the middle and bottom of the filter tube, and filter screens are fixed in the middle of the two air inlets. An air filter element is provided between the two filter screens and is installed inside the filter tube. A sealing ring is fitted on the upper end of the filter tube.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0016] 1. This utility model uses a backing plate, a kit, and a spring pin to adjust the angle of the backing plate. Furthermore, the presence of an auxiliary crossbar, auxiliary legs, and auxiliary wheels allows the device to be adjusted to a horizontal position, with the extended auxiliary crossbar and auxiliary legs providing additional support in conjunction with the auxiliary wheels, thereby increasing the stability of the device.

[0017] 2. To facilitate quick adjustment of the extension or retraction of the auxiliary crossbar, this utility model utilizes a small air pump, a first electromagnetic three-way valve, and a strip-shaped telescopic airbag to assist the user in adjustment. During adjustment, first loosen the positioning bolt to disengage the conical part from the limiting hole. Then, activate the small air pump. The negative pressure end of the small air pump pumps external air into the three-way pipe, which then flows through the first conduit and the first electromagnetic three-way valve into the air nozzle of the strip-shaped telescopic airbag. As the air is injected, the strip-shaped telescopic airbag expands, pushing the auxiliary crossbar out. This changes the position of the auxiliary legs and wheels, increasing the support surface of the wheelchair and improving stability. Conversely, when the auxiliary crossbar needs to be retracted, the unconnected pipe end of the first electromagnetic three-way valve opens, releasing the gas inside the strip-shaped telescopic airbag. The airbag then retracts, causing the auxiliary crossbar to retract into the sleeve.

[0018] 3. This utility model, by setting a fan-shaped telescopic airbag, allows users to quickly adjust the angle of the backrest as needed. When adjusting, pulling out the spring pin changes the opening angle of the backrest by injecting or venting gas inside the fan-shaped telescopic airbag. Specifically, when the small air pump is injected by controlling the second electromagnetic three-way valve, the opening process is completed. When venting is required, the air inlet of the second electromagnetic three-way valve is closed, while the other air inlet, which is connected to the pipe, is opened to vent the gas inside the fan-shaped telescopic airbag. The air pressure sensor is set to detect the air pressure inside both the strip-shaped telescopic airbag and the fan-shaped telescopic airbag.

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] In the picture:

[0022] Figure 1 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the combined structure of the pallet and rubber pad in this utility model.

[0024] Figure 3 This is a structural diagram of the combined parts of the filter tube, filter screen and air filter element in this utility model;

[0025] Figure 4 for Figure 1 A schematic diagram of the structure of part A in the diagram;

[0026] Figure 5 for Figure 1 A schematic diagram of the structure of part B in the diagram;

[0027] Figure 6 for Figure 1 A schematic diagram of the structure of part C in the diagram;

[0028] Figure 7 for Figure 1 A schematic diagram of the structure of part D in the diagram.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Seat frame; 2. Main wheels; 3. Auxiliary crossbar; 4. Sleeve rod; 5. Auxiliary support leg; 6. Auxiliary wheel; 7. Support plate; 8. Rubber pad; 9. Backrest; 10. Kit; 11. Spring pin; 12. Sealing ring; 13. Chassis; 14. Controller; 15. J-shaped plate; 16. Limit bolt; 17. Velcro; 18. Sponge pad; 19. Guide block; 20. Sleeve block; 21. Fixing bolt; 22. Positioning bolt; 23. Conical part; 24. Limiting hole; 25. Guide rod; 26. Strip-shaped telescopic airbag; 27. First electromagnetic three-way valve; 28. First conduit; 29. ​​Three-way pipe; 30. Small air pump; 31. Filter tube; 32. Cross plate; 33. Fan-shaped telescopic airbag; 34. Second electromagnetic three-way valve; 35. Second conduit; 36. Air pressure sensor; 37. Filter screen; 38. Air filter element.

[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] Please see Figures 1 to 7 This utility model provides a technical solution: an adjustable backrest wheelchair, including a seat frame 1, a seat plate, a backrest 9, an auxiliary crossbar 3 and auxiliary support legs 5. Main wheels 2 are hinged to the front and rear ends of one side of the seat frame 1. Sleeve rods 4 for extending the auxiliary crossbar 3 are fixed in the middle of the front and rear sides of the seat frame 1. An auxiliary support leg 5 is fixed to the outer end of each auxiliary crossbar 3. Auxiliary wheels 6 are fixed to the two auxiliary support legs 5 and the front and rear sides of the other side of the seat frame 1. A support plate 7 is fixed to the top of the auxiliary support leg 5. A rubber pad 8 that contacts the surface of the backrest 9 is fixed on the surface of the support plate 7.

[0034] A seat plate is fixedly installed on the upper end of the seat frame 1. A kit 10 for mounting the front and rear shafts of the backrest 9 is fixed on one side of the upper end of the seat frame 1. The surface of the kit 10 is provided with positioning holes for inserting spring pins 11 at equal intervals. The surface of the backrest 9 is provided with fixing holes for inserting spring pins 11.

[0035] On the other side of the seat frame 1, L-shaped armrest movable connecting sleeves 20 are fixedly installed at both the front and rear ends. At the lower end of the seat frame 1, a housing 13 and a controller 14 are also fixed. Considering that the existing wheelchair backrest adjustment angle is limited, the wheelchair cannot maintain balance when adjusted to a horizontal position and is prone to tipping over, which is not conducive to the use of the user, this utility model sets up a backrest 9, a kit 10 and a spring pin 11 to cooperate with each other to adjust the angle of the backrest 9. Furthermore, the presence of the auxiliary crossbar 3, auxiliary support leg 5 and auxiliary wheel 6 allows the auxiliary crossbar 3 and auxiliary support leg 5 to be pulled out and cooperate with the auxiliary wheel 6 to provide auxiliary support when the backrest 9 is adjusted to a horizontal position, thereby increasing the stability of the device.

[0036] The backrest 9 has a cavity at the top for pulling out the J-shaped plate 15. A limiting bolt 16 for fixing the working length of the J-shaped plate 15 is threaded to the upper outer side of the backrest 9. The upper ends of the J-shaped plate 15, the seat plate, and the L-shaped armrest are all fitted with sponge pads 18 via Velcro 17. The limiting bolt 16 adjusts the working length of the J-shaped plate 15. When the J-shaped plate 15 is pulled out to the required working length, the limiting bolt 16 is tightened to fix its position. The sponge pad 18 on the surface of the J-shaped plate 15 acts as a pillow for the user's head.

[0037] The L-shaped handrail has a guide groove in the middle of its vertical end for the guide block 19 to pass through. The guide block 19 is fixedly installed in the middle of the sleeve block 20. The sleeve block 20 is threadedly connected to a fixing bolt 21 for fixing the vertical end of the L-shaped handrail. The fixing bolt 21 is used to adjust the height of the L-shaped handrail. The fixing bolt 21 can be loosened to adjust the height of the L-shaped handrail according to the user's needs. After adjustment, the fixing bolt 21 can be tightened.

[0038] The upper end of the sleeve rod 4 is threaded with a positioning bolt 22 for fixing the extension length of the auxiliary crossbar 3. A tapered part 23 is rotatably connected to the bottom end of the positioning bolt 22 via a bearing. The surface of the auxiliary crossbar 3 is provided with limiting holes 24 at equal intervals that are adapted to the external dimensions of the tapered part 23. A strip groove is provided in the middle of the auxiliary crossbar 3 for the guide rod 25 to pass through. The guide rod 25 is fixedly installed inside the sleeve rod 4. The positioning bolt 22 is used to fix the position of the auxiliary crossbar 3 during the extension, preventing the auxiliary crossbar 3 from lacking a fixing structure and causing lateral displacement during use.

[0039] The sleeve rod 4 has a strip-shaped telescopic airbag 26 inside. One end of the strip-shaped telescopic airbag 26 is connected to the delivery end of the first electromagnetic three-way valve 27 through an air nozzle. One injection end of the first electromagnetic three-way valve 27 is connected to the three-way pipe 29 through the first conduit 28 through the inside of the casing 13. The bottom of the three-way pipe 29 is connected to the delivery end of the small air pump 30 inside the casing 13. The negative pressure end of the small air pump 30 is connected to the filter pipe 31 at the bottom of the casing 13 through a pipe. The other end of the strip-shaped telescopic airbag 26 is fixed to the side end of the auxiliary crossbar 3. In order to facilitate the user to quickly adjust the extension or retraction of the auxiliary crossbar 3, the device will cooperate with the small air pump 30, the first electromagnetic three-way valve 27 and the strip-shaped telescopic airbag 26 to help the user make adjustments. First, loosen the positioning bolt 22 to disengage the conical part 23 from the limiting hole 24. Then, turn on the switch of the small air pump 30. The negative pressure end of the small air pump 30 pumps external air into the three-way pipe 29 and then into the air nozzle of the strip telescopic airbag 26 through the first conduit 28 and the first electromagnetic three-way valve 27. As the air is injected, the strip telescopic airbag 26 expands, causing the auxiliary crossbar 3 to be pushed out. When pushed out, the position of the auxiliary support leg 5 and the auxiliary wheel 6 changes. At this time, the support surface of the wheelchair will become larger, thereby obtaining better stability. Conversely, when it is necessary to retract the auxiliary crossbar 3, the unconnected pipe end of the first electromagnetic three-way valve 27 opens. At this time, the air inside the strip telescopic airbag 26 is discharged, and the strip telescopic airbag 26 contracts, causing the auxiliary crossbar 3 to retract into the sleeve 4.

[0040] A horizontal plate 32 is fixed to one side of the seat frame 1. A fan-shaped telescopic airbag 33 is provided between the horizontal plate 32 and the backrest 9. The air nozzle of the fan-shaped telescopic airbag 33 is connected to a second electromagnetic three-way valve 34. One of the air injection ends of the second electromagnetic three-way valve 34 passes through a second conduit 35 into the interior of the housing 13 and is connected to the other end of the three-way pipe 29. Both the strip-shaped telescopic airbag 26 and the fan-shaped telescopic airbag 33 are connected to the air pressure sensor 36 through pipes. The air pressure sensor 36 is connected to the controller 14 through wires. The fan-shaped telescopic airbag 33 facilitates the user to quickly... Adjusting the angle of the backrest 9 involves pulling out the spring pin 11. This changes the opening angle of the backrest 9 by injecting or venting gas into the fan-shaped telescopic airbag 33. When the small air pump 30 is injected via the second electromagnetic three-way valve 34, the opening process is completed. When venting is required, the air inlet of the second electromagnetic three-way valve 34 is closed, while the other air inlet, which is connected to the pipe, is opened, venting the gas inside the fan-shaped telescopic airbag 33. The air pressure sensor 36 monitors the air pressure inside the strip telescopic airbag 26 and the fan-shaped telescopic airbag 33.

[0041] The filter tube 31 has a threaded end that matches the screw hole at the bottom of the housing 13. Air inlets for air flow are provided in the middle and bottom of the filter tube 31. A filter screen 37 is fixed in the middle of each air inlet. An air filter element 38 is provided between the two filter screens 37 and installed inside the filter tube 31. A sealing ring 12 is fitted on the upper end of the filter tube 31. The filter tube 31 filters the gas entering the small air pump 30, preventing dust particles in the air from entering and damaging the pipes and the small air pump 30.

[0042] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A wheelchair with adjustable backrest, comprising a seat frame (1), a seat plate, a backrest plate (9), an auxiliary crossbar (3) and an auxiliary leg (5), characterized in that, The side of the seat frame (1) is hinged with a main wheel (2) at both ends, and a sleeve rod (4) is fixed on the middle of the front and rear sides of the seat frame (1) for stretching the auxiliary cross rod (3), the outer side end of each auxiliary cross rod (3) is fixed with an auxiliary supporting leg (5), the other side of the two auxiliary supporting legs (5) and the seat frame (1) is fixed with an auxiliary wheel (6), the top of the auxiliary supporting leg (5) is fixed with a supporting plate (7), and the surface of the supporting plate (7) is fixed with a rubber pad (8) in contact with the surface of the backrest (9); The upper end of the seat frame (1) is fixedly installed with a seat plate, and the sleeve assembly (10) is fixed on one side of the upper end of the seat frame (1) for the front and rear end shaft body of the backrest (9), the surface of the sleeve assembly (10) is equally spaced to form a positioning hole for inserting the spring pin (11), and the surface of the backrest (9) is provided with a fixed hole for inserting the spring pin (11). The other side of the seat frame (1) is also fixedly installed with a sleeve block (20) movably connected with the L-shaped handrail, and a machine box (13) and a controller (14) are further fixed on the lower end of the seat frame (1).

2. The wheelchair of claim 1, wherein, The top of the backrest (9) is provided with a cavity for pulling out the J-shaped plate (15), the outer side upper end of the backrest (9) is threadedly connected with a limiting bolt (16) for fixing the use length of the J-shaped plate (15), and the upper ends of the J-shaped plate (15), the seat plate and the L-shaped handrail are all installed with a sponge pad (18) through a magic tape (17).

3. The adjustable backrest wheelchair of claim 1, wherein, The vertical end of the L-shaped handrail is provided with a guide groove for penetrating the guide block (19), the guide block (19) is fixedly installed in the middle of the sleeve block (20), and the side of the sleeve block (20) is threadedly connected with a fixing bolt (21) for fixing the use position of the vertical end of the L-shaped handrail.

4. The adjustable backrest wheelchair of claim 1, wherein, The upper end of the sleeve rod (4) is threadedly connected with a positioning bolt (22) for fixing the pulling length of the auxiliary cross rod (3), a conical part (23) is rotatably connected to the bottom end of the positioning bolt (22) through a bearing, and the surface of the auxiliary cross rod (3) is equally spaced to form a limiting hole (24) matched with the outer dimension of the conical part (23), the middle of the auxiliary cross rod (3) is provided with a strip-shaped groove for penetrating the guide rod (25), and the guide rod (25) is fixedly installed in the sleeve rod (4).

5. The adjustable backrest wheelchair of claim 1, wherein, The inside of the sleeve rod (4) is provided with a strip-shaped telescopic air bag (26), one end of the strip-shaped telescopic air bag (26) is communicated with the delivery end of a first electromagnetic three-way valve (27) through an air nozzle, one of the injection ends of the first electromagnetic three-way valve (27) is communicated with a three-way pipe (29) through a first conduit (28) penetrating the inside of the machine box (13), the bottom of the three-way pipe (29) is communicated with the delivery end of a small air pump (30) in the inside of the machine box (13), the negative pressure end of the small air pump (30) is communicated with a filter pipe (31) at the bottom of the machine box (13) through a pipeline, and the other end of the strip-shaped telescopic air bag (26) is fixed with the side end of the auxiliary cross rod (3).

6. The adjustable backrest wheelchair according to claim 5, wherein, One side of the seat frame (1) is fixed with a transverse plate (32), a fan-shaped telescopic air bag (33) is arranged between the transverse plate (32) and the back plate (9), and the air nozzle of the fan-shaped telescopic air bag (33) is communicated with a second electromagnetic three-way valve (34), one of the gas injection ends of the second electromagnetic three-way valve (34) penetrates to the inside of the case (13) through a second conduit (35) and is communicated with the other end of the three-way pipe (29), the strip-shaped telescopic air bag (26) and the fan-shaped telescopic air bag (33) are connected with an air pressure sensor (36) through pipelines, and the air pressure sensor (36) is connected with a controller (14) through a wire.

7. The adjustable backrest wheelchair of claim 5, wherein, The upper end of the filter pipe (31) is provided with a screw thread matched with the screw hole at the bottom of the case (13), air inlet holes for air circulation are arranged in the middle and the bottom of the filter pipe (31), filter screens (37) are fixed in the middle of the two air inlet holes, an air filter element (38) is arranged between the two filter screens (37), and the air filter element (38) is installed in the inside of the filter pipe (31).

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