Tilting folding wheelchair
Through the linkage of the four-link mechanism and the gas spring, the problem of the armrests and foot lever required to be adjusted secondary when the backrest is tilted by the existing wheelchair, and the synchronous adjustment of the armrest and foot lever and the backrest rod is achieved, improving the convenience of operation and sense of advancedness.
Patent Information
- Application Number
- CN202421946697.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-13
AI Technical Summary
Existing wheelchairs cannot achieve multi-position adjustment of the seat, resulting in inconvenient operation and insufficient sense of advancedness. Especially when the backrest is lying down, the handrails and foot lever require secondary manual adjustment.
The four-link mechanism and the gas spring are connected, and the backrest rod is tilted through the expansion and contraction of the gas spring, and the posture changes of the handrail and foot pedal rod are linked to achieve synchronous adjustment of the handrail, foot pedal rod and the backrest rod, forming a crank slider mechanism to ensure simple operation and strong sense of advancedness.
The linkage adjustment of the backrest rod, handrail rod and foot rod is achieved, which is easy to operate, improves the comfort and sense of advanced use, and can be adjusted to multiple inclination angles.
Smart Images
Figure CN223081869U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a tiltable and foldable wheelchair which is convenient to operate and has a strong sense of luxury. Background Art
[0002] A wheelchair is a medical device for assisting patients in treatment and rehabilitation, usually composed of a foldable frame, left and right side plates (skirt plates), front and rear wheels, footrests and other components. When the existing wheelchairs are in use, most of them can only achieve a single sitting posture and cannot be tilted, resulting in poor comfort. Although a small number of wheelchairs can adjust the sitting posture to achieve tilting, most of these wheelchairs are realized by adjusting the backrest alone or electrically. The armrests and footrest rods do not move accordingly. After the adjustment is in place, secondary manual adjustment of components such as armrests and footrest rods is required, which is inconvenient to operate and has a poor sense of luxury. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a tiltable and foldable wheelchair which is convenient to operate and has a strong sense of luxury.
[0004] To achieve the above purpose, the technical solution adopted by the utility model is a tiltable and foldable wheelchair, which includes side brackets arranged on both left and right sides. The side brackets include a bottom support rod extending in the front-rear direction, a seat rod fixedly parallel above the bottom support rod, a backrest rod rotatably connected to the rear end of the seat rod and extending obliquely backward and upward, an armrest rod arranged parallel above the seat rod, and a footrest rod extending obliquely from the front lower part to the rear upper part.
[0005] The front end of the seat rod extends forward beyond the bottom support rod to form a front extension section, the rear end of the bottom support rod extends backward beyond the seat rod to form a rear extension section, the rear end of the armrest rod is rotatably connected to the lower end of the backrest rod, and the upper end of the footrest rod is rotatably connected to the front end of the front extension section.
[0006] The side bracket further includes a linkage rod group and a gas spring. The linkage rod group includes a vertical linkage rod and a horizontal linkage rod. The middle of the vertical linkage rod is rotatably connected to the rear end of the front extension section, the upper end of the vertical linkage rod is rotatably connected to the front end of the armrest rod, the front end of the horizontal linkage rod is rotatably connected to the upper end of the footrest rod, the rear end of the horizontal linkage rod is rotatably connected to the lower end of the vertical linkage rod, the gas spring is located behind the seat rod, the upper end of the gas spring is rotatably connected to the lower end of the backrest rod, and the lower end of the gas spring extends obliquely backward and downward and is rotatably connected to the rear end of the rear extension section.
[0007] Preferably, the rear extension section includes a rear extension section body in the shape of a circular tube, and a rear extension rod slidably inserted into the rear extension section body in the front-rear direction. The lower end of the gas spring is rotatably connected to the rear end of the rear extension rod. A locking bolt for locking the length of the rear extension rod extending backward is further provided on the rear extension section body.
[0008] Preferably, the rear end of the armrest rod and the lower end of the backrest rod are rotatably connected by a first rotating shaft, and the upper end of the gas spring and the lower end of the backrest rod are rotatably connected by a second rotating shaft. The second rotating shaft is not higher than the first rotating shaft. When the gas spring extends to the longest, the angle between the backrest rod and the seat rod is 150 to 160°.
[0009] Preferably, the vertical linkage rod is located outside the seat rod. The middle of the vertical linkage rod is rotatably connected to the rear end of the front extension section by a third rotating shaft. The upper end of the vertical linkage rod is rotatably connected to the front end of the armrest rod by a fourth rotating shaft. The lower end of the vertical linkage rod is rotatably connected to the rear end of the horizontal linkage rod by a fifth rotating shaft. The distance between the fourth rotating shaft and the third rotating shaft is 1.35 to 1.45 times the distance between the fifth rotating shaft and the third rotating shaft.
[0010] Preferably, the footrest rod includes a footrest rod body extending obliquely from the front lower direction to the rear upper direction, and a footrest plate rotatably connected to the lower end of the footrest rod body. The front end of the front extension section is rotatably connected to the upper end of the footrest rod body by a sixth rotating shaft. The front end of the horizontal linkage rod is rotatably connected to the upper end of the footrest rod body by a seventh rotating shaft. The seventh rotating shaft is located below the sixth rotating shaft. When the gas spring extends to the longest, the footrest rod body is located on the extension line of the seat rod.
[0011] Preferably, the side bracket further includes a connecting rod connecting the bottom support rod and the seat rod. The connecting rod extends in the up-down direction. The upper end of the connecting rod is connected to the rear end of the front extension section, and the lower end of the connecting rod is connected to the front end of the bottom support rod.
[0012] Preferably, the rear end of the seat rod is bent downward and connected to the front end of the rear extension section. A hinge seat is provided at the bent portion of the seat rod. The lower end of the backrest rod is rotatably connected to the hinge seat by an eighth rotating shaft.
[0013] Preferably, the front end of the armrest rod is bent downward, the rear end of the armrest rod is bent backward and downward. A side plate is connected to the outside of the armrest rod. An unlocking handle for releasing the telescopic limitation of the gas spring is embedded in the side plate. When the unlocking handle is toggled, the gas spring can extend or contract.
[0014] Preferably, the tiltable folding wheelchair further includes a wheelchair frame that can be folded left and right, and the side brackets are connected to the left and right sides of the wheelchair frame.
[0015] More preferably, a cross beam that can be folded left and right is connected to the upper end of the backrest rod, and a backrest extension rod is detachably inserted into the upper end of the backrest rod. The backrest extension rod is in the shape of a door frame.
[0016] Preferably, the tiltable folding wheelchair further includes a front wheel, a rear wheel and an auxiliary wheel. The front wheel is rotatably connected to the front end of the bottom support rod, the rear wheel is rotatably connected to the rear extension section, and the auxiliary wheel is connected to the rear extension section through an auxiliary wheel bracket.
[0017] More preferably, a hub motor is provided on the rear wheel, and a battery box for supplying power to the hub motor is also connected to the outer sides of the seat rod and the bottom support rod.
[0018] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:
[0019] By rotatably connecting the middle part of the vertical linkage rod to the rear end of the front extension section, connecting the upper end of the vertical linkage rod to the front end of the armrest rod, connecting the front end of the horizontal linkage rod to the upper end of the footrest rod, connecting the rear end of the horizontal linkage rod to the lower end of the vertical linkage rod, connecting the upper end of the gas spring to the lower end of the backrest rod, and making the lower end of the gas spring extend obliquely backward and downward and rotatably connect to the rear end of the rear extension section, it is possible to form a first four-bar linkage mechanism with the armrest rod, the backrest rod, the seat rod and the vertical linkage rod, a second four-bar linkage mechanism with the footrest rod, the horizontal linkage rod, the vertical linkage rod and the seat rod, and a crank-slider mechanism with the backrest rod, the gas spring and the bottom support rod. When the gas spring expands and contracts, it can not only drive the backrest rod to rotate backward to achieve tilting through the crank-slider mechanism, but also drive the first four-bar linkage mechanism and the second four-bar linkage mechanism to act through the rotation of the backrest rod, so that the armrest rod and the footrest rod change their postures to match the tilting, realizing the linkage between the postures of the armrest rod and the footrest rod and the backrest tilting, with convenient operation and strong sense of sophistication. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 、 Figure 2 、 Figure 3 are left side schematic views of the preferred embodiment of the present utility model. Among them, Figure 1 has not been tilted, Figure 3 has been tilted to the maximum angle, Figure 2 is in the process of tilting.
[0021] Figure 4 、 Figure 5 、 Figure 6 areFigure 1 Schematic three-dimensional view.
[0022] Figure 7 is Figure 2 Schematic three-dimensional view.
[0023] Figure 8 is Figure 1 Schematic view after hiding the left rear wheel.
[0024] Wherein: 1. Side bracket; 2. Wheelchair frame; 3. Front wheel; 4. Rear wheel; 5. Auxiliary wheel; 6. Auxiliary wheel bracket; 7. Hub motor; 8. Battery box; 10. Bottom strut; 11. Rear extension section; 111. Rear extension section body; 112. Rear extension rod; 113. Locking bolt; 20. Seat rod; 21. Front extension section; 22. Hinge seat; 30. Backrest rod; 31. Eighth rotating shaft; 32. Cross beam; 33. Backrest extension rod; 40. Armrest rod; 41. First rotating shaft; 42. Side plate; 43. Unlock handle; 50. Footrest rod; 51. Footrest rod body; 511. Sixth rotating shaft; 512. Seventh rotating shaft; 52. Footrest; 61. Vertical linkage rod; 611. Third rotating shaft; 612. Fourth rotating shaft; 613. Fifth rotating shaft; 62. Horizontal linkage rod; 70. Gas spring; 71. Second rotating shaft; 80. Connecting rod. Detailed implementation mode
[0025] The front-back direction, left-right direction and up-down direction described in the present utility model are based on the front-back direction, left-right direction and up-down direction observed by a patient when sitting on the tiltable and foldable wheelchair provided by the present utility model.
[0026] Such as Figures 1 to 8As shown in the figure, the tiltable folding wheelchair provided by the present utility model includes side brackets 1 provided on the left and right sides. The side bracket 1 includes a bottom support rod 10 extending in the front-rear direction, a seat rod 20 fixedly parallel above the bottom support rod 10, a backrest rod 30 rotatably connected to the rear end of the seat rod 20 and extending obliquely backward and upward, an armrest rod 40 arranged in parallel above the seat rod 20, and a footrest rod 50 extending obliquely backward and upward from the front lower part; wherein, the front end of the seat rod 20 extends forward beyond the bottom support rod 10 to form a front extension section 21, the rear end of the bottom support rod 10 extends backward beyond the seat rod 20 to form a rear extension section 11, the rear end of the armrest rod 40 is rotatably connected to the lower end of the backrest rod 30, and the upper end of the footrest rod 50 is rotatably connected to the front end of the front extension section 21; the side bracket 1 further includes a linkage rod group and a gas spring 70. The linkage rod group includes a vertical linkage rod 61 and a horizontal linkage rod 62. The middle of the vertical linkage rod 61 is rotatably connected to the rear end of the front extension section 21, the upper end of the vertical linkage rod 61 is rotatably connected to the front end of the armrest rod 40, the front end of the horizontal linkage rod 62 is rotatably connected to the upper end of the footrest rod 50, the rear end of the horizontal linkage rod 62 is rotatably connected to the lower end of the vertical linkage rod 61, the gas spring 70 is located behind the seat rod 20, the upper end of the gas spring 70 is rotatably connected to the lower end of the backrest rod 30, and the lower end of the gas spring 70 extends obliquely backward and downward and is rotatably connected to the rear end of the rear extension section 11.
[0027] The advantages of such a setting are as follows: It can make the armrest rod, backrest rod, seat rod, and vertical linkage rod form a first four-bar linkage mechanism, make the footrest rod, horizontal linkage rod, vertical linkage rod, and seat rod form a second four-bar linkage mechanism, and make the backrest rod, gas spring, and bottom support rod form a crank-slider mechanism. When the gas spring expands and contracts, it can not only drive the backrest rod to rotate backward to achieve tilting through the crank-slider mechanism, but also drive the first four-bar linkage mechanism and the second four-bar linkage mechanism to act through the rotation of the backrest rod, so that the armrest rod and the footrest rod change their postures to match the tilting, realizing the linkage between the postures of the armrest rod and the footrest rod and the backrest tilting, making the operation of the tiltable folding wheelchair convenient and with a strong sense of high-class.
[0028] To facilitate adjusting the maximum tilting angle, in this embodiment, the rear extension section 11 includes a rear extension section body 111 in the shape of a circular tube, a rear extension rod 112 slidably inserted into the rear extension section body 111 in the front-rear direction. The lower end of the gas spring 70 is rotatably connected to the rear end of the rear extension rod 112. The rear extension section body 111 is also provided with a locking bolt 113 for locking the length of the rear extension rod 112 extending backward. By adjusting the length of the rear extension rod 112 extending backward, the position of the rotation fulcrum of the lower end of the gas spring 70 can be changed, thereby adjusting the maximum angle (the included angle between the backrest rod 30 and the seat rod 20) when the tiltable folding wheelchair tilts.
[0029] In order to further improve the operation convenience, comfort and high-class sense during use, in this embodiment, the rear end of the armrest rod 40 is rotatably connected to the lower end of the backrest rod 30 through a first rotating shaft 41, and the upper end of the gas spring 70 is rotatably connected to the lower end of the backrest rod 30 through a second rotating shaft 71. The second rotating shaft 71 is not higher than the first rotating shaft 41. When the gas spring 70 extends to the longest, the included angle between the backrest rod 30 and the seat rod 20 is 150 to 160°. The vertical linkage rod 61 is located outside the seat rod 20. The middle part of the vertical linkage rod 61 is rotatably connected to the rear end of the front extension section 21 through a third rotating shaft 611. The upper end of the vertical linkage rod 61 is rotatably connected to the front end of the armrest rod 40 through a fourth rotating shaft 612. The lower end of the vertical linkage rod 61 is rotatably connected to the rear end of the horizontal linkage rod 62 through a fifth rotating shaft 613. The distance between the fourth rotating shaft 612 and the third rotating shaft 611 is 1.35 to 1.45 times the distance between the fifth rotating shaft 613 and the third rotating shaft 611. The footrest rod 50 includes a footrest rod body 51 that extends obliquely backward and upward from the front lower direction, and a footrest plate 52 rotatably connected to the lower end of the footrest rod body 51. The front end of the front extension section 21 is rotatably connected to the upper end of the footrest rod body 51 through a sixth rotating shaft 511. The front end of the horizontal linkage rod 62 is rotatably connected to the upper end of the footrest rod body 51 through a seventh rotating shaft 512. The seventh rotating shaft 512 is located below the sixth rotating shaft 511. When the gas spring 70 extends to the longest, the footrest rod body 511 is located on the extension line of the seat rod 20.
[0030] In order to improve the stability between the seat rod 20 and the bottom support rod 10, in this embodiment, the side bracket 1 further includes a connecting rod 80 connecting the bottom support rod 10 and the seat rod 20. The connecting rod 80 extends in the up-and-down direction. The upper end of the connecting rod 80 is connected to the rear end of the front extension section 21, and the lower end of the connecting rod 80 is connected to the front end of the bottom support rod 10. Further, the rear end of the seat rod 20 is bent downward and connected to the front end of the rear extension section 11. An articulated seat 22 is provided at the bent portion of the seat rod 20. The lower end of the backrest rod 30 is rotatably connected to the articulated seat 22 through an eighth rotating shaft 31.
[0031] For the convenience of operation, in this embodiment, the front end of the armrest rod 40 is bent downward, and the rear end of the armrest rod 40 is bent backward and downward. A side plate 42 is connected to the outside of the armrest rod 40. An unlocking handle 43 for releasing the telescopic limit of the gas spring 70 is embedded on the side plate 42. When the unlocking handle 43 is pulled, the gas spring 70 can be extended or shortened, and the reclining angle can also be changed steplessly.
[0032] In this embodiment, the tiltable folding wheelchair further includes a wheelchair frame 2 that can be folded left and right. Side brackets 1 are connected to the left and right sides of the wheelchair frame 2. The upper end of the backrest rod 30 is connected with a cross beam 32 that can be folded left and right. The upper end of the backrest rod 30 is also detachably inserted with a backrest extension rod 33, and the backrest extension rod 33 is in the shape of a door frame.
[0033] Furthermore, the tiltable folding wheelchair further includes a front wheel 3, a rear wheel 4 and an auxiliary wheel 5. The front wheel 3 is rotatably connected to the front end of the bottom support rod 10. The rear wheel 4 is rotatably connected to the rear extension section 11. The auxiliary wheel 5 is connected to the rear extension section 11 through an auxiliary wheel bracket 6. At the same time, a hub motor 7 is provided on the rear wheel 4. A battery box 8 for supplying power to the hub motor 7 is also connected to the outside of the seat rod 20 and the bottom support rod 10.
[0034] The above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.
Claims
1. Tilting and folding wheelchair, including side brackets arranged on the left and right sides, the side brackets including a bottom support rod extending in the front-rear direction, a seat rod fixedly parallel above the bottom support rod, a backrest rod rotatably connected to the rear end of the seat rod and extending obliquely backward and upward, an armrest rod arranged parallel above the seat rod, and a footrest rod extending obliquely from the front lower part to the rear upper part, characterized in that: The front end of the seat rod extends forward beyond the bottom support rod to form a front extension section, the rear end of the bottom support rod extends backward beyond the seat rod to form a rear extension section, the rear end of the armrest rod is rotatably connected to the lower end of the backrest rod, and the upper end of the footrest rod is rotatably connected to the front end of the front extension section; The side bracket further includes a linkage rod group and a gas spring, the linkage rod group including a vertical linkage rod and a horizontal linkage rod, the middle of the vertical linkage rod is rotatably connected to the rear end of the front extension section, the upper end of the vertical linkage rod is rotatably connected to the front end of the armrest rod, the front end of the horizontal linkage rod is rotatably connected to the upper end of the footrest rod, the rear end of the horizontal linkage rod is rotatably connected to the lower end of the vertical linkage rod, the gas spring is located behind the seat rod, the upper end of the gas spring is rotatably connected to the lower end of the backrest rod, and the lower end of the gas spring extends obliquely backward and downward and is rotatably connected to the rear end of the rear extension section.
2. The tiltable folding wheelchair according to claim 1, characterized in that: The rear extension section includes a rear extension section body in the shape of a circular tube, and a rear extension rod slidably inserted into the rear extension section body in the front-rear direction. The lower end of the gas spring is rotatably connected to the rear end of the rear extension rod, and a locking bolt is further provided on the rear extension section body for locking the length of the rear extension rod extending backward.
3. The tiltable folding wheelchair according to claim 1, wherein: The rear end of the armrest rod is rotatably connected to the lower end of the backrest rod through a first rotating shaft, the upper end of the gas spring is rotatably connected to the lower end of the backrest rod through a second rotating shaft, the second rotating shaft is not higher than the first rotating shaft, and when the gas spring extends to the longest, the angle between the backrest rod and the seat rod is 150 to 160°.
4. The tiltable folding wheelchair according to claim 1, characterized in that: The vertical linkage rod is located outside the seat rod. The middle of the vertical linkage rod is rotatably connected to the rear end of the front extension section through a third rotating shaft, the upper end of the vertical linkage rod is rotatably connected to the front end of the armrest rod through a fourth rotating shaft, the lower end of the vertical linkage rod is rotatably connected to the rear end of the horizontal linkage rod through a fifth rotating shaft, and the distance between the fourth rotating shaft and the third rotating shaft is 1.35 to 1.45 times the distance between the fifth rotating shaft and the third rotating shaft.
5. The tiltable folding wheelchair according to claim 1, characterized in that: The footrest rod includes a footrest rod body extending obliquely from the front lower part to the rear upper part, and a footrest plate rotatably connected to the lower end of the footrest rod body. The front end of the front extension section is rotatably connected to the upper end of the footrest rod body through a sixth rotating shaft, the front end of the horizontal linkage rod is rotatably connected to the upper end of the footrest rod body through a seventh rotating shaft, the seventh rotating shaft is located below the sixth rotating shaft, and when the gas spring extends to the longest, the footrest rod body is located on the extension line of the seat rod.
6. The tiltable folding wheelchair according to claim 1, wherein: The side bracket further includes a connecting rod connecting the bottom support rod and the seat rod. The connecting rod extends in the vertical direction. The upper end of the connecting rod is connected to the rear end of the front extension section, and the lower end of the connecting rod is connected to the front end of the bottom support rod.
7. The tiltable folding wheelchair according to claim 1, characterized in that: The rear end of the seat rod is bent downward and connected to the front end of the rear extension section. A hinge seat is provided at the bent portion of the seat rod. The lower end of the backrest rod is rotatably connected to the hinge seat through an eighth rotating shaft.
8. The tiltable folding wheelchair according to claim 1, wherein: The front end of the armrest rod is bent downward, the rear end of the armrest rod is bent backward and downward. A side plate is connected to the outer side of the armrest rod. An unlocking handle for releasing the telescopic limitation of the gas spring is embedded in the side plate. When the unlocking handle is toggled, the gas spring can be extended or shortened.
9. The tiltable folding wheelchair according to claim 1, characterized in that: The tiltable and foldable wheelchair further includes a wheelchair frame that can be folded left and right. The side brackets are connected to the left and right sides of the wheelchair frame.
10. The tilting and folding wheelchair according to claim 9, characterized in that: The upper end of the backrest rod is connected with a cross beam that can be folded left and right. The upper end of the backrest rod is also detachably inserted with a backrest extension rod, and the backrest extension rod is in the shape of a door frame.
11. The tiltable folding wheelchair according to claim 1, characterized in that: The tiltable and foldable wheelchair further includes a front wheel, a rear wheel and an auxiliary wheel. The front wheel is rotatably connected to the front end of the bottom support rod, the rear wheel is rotatably connected to the rear extension section, and the auxiliary wheel is connected to the rear extension section through an auxiliary wheel bracket.
12. The tiltable folding wheelchair according to claim 11, characterized in that: A hub motor is provided on the rear wheel. A battery box for supplying power to the hub motor is also connected to the outer sides of the seat rod and the bottom support rod.