Tilting folding wheelchair

Abstract

The utility model provides a foldable wheelchair capable of inclining and lying, which comprises a side support, the side support comprises a main frame body, a seat rod, a backrest rod and a connecting rod group comprising an upper connecting rod, a lower connecting rod and a gas spring, the main frame body comprises an upper supporting rod, a lower supporting rod and a connecting rod, and a hinge seat of the seat rod is rotatably connected with the middle of the upper supporting rod. The upper end part of the upper connecting rod is rotationally connected with the rear end part of the seat rod, the lower end part of the upper connecting rod is rotationally connected with the upper end part of the lower connecting rod, the lower end part of the lower connecting rod is rotationally connected with the rear end part of the upper supporting rod, and the upper end part of the air spring is rotationally connected with the lower end part of the upper connecting rod and / or the upper end part of the lower connecting rod; the lower connecting rod, the air spring and the main frame body can form a crank sliding block mechanism, the upper connecting rod, the seat rod, the main frame body and the air spring can form a four-connecting-rod mechanism, tilting and lying can be achieved through stretching and retracting of the air spring, the tilting and lying angle can be locked by locking the air spring, stability is good, the occupied size is small, and the requirements for miniaturization and convenience of consumers can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a tiltable and foldable wheelchair with better stability. 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. At present, most wheelchairs on the market can only achieve a single sitting position and cannot tilt when in use, resulting in poor comfort. There are also a small number of wheelchairs that can tilt the seat cushion and backrest as a whole. However, most of these wheelchairs adjust the tilt angle through a sliding groove. Since the side plate where the sliding groove is located is relatively thin, when locked, the tightening force of the bolt against the side plate of the sliding groove is limited, and the stability is poor. In addition, the sliding groove has a long extension length and a large arc, so that the side plate where the sliding groove is located occupies a large volume. Even after folding, the wheelchair will still occupy a large storage space, making it difficult to meet the needs of consumers for miniaturization and convenience. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a tiltable and foldable wheelchair with good stability.

[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 main frame body extending in the front-rear direction, a seat rod located above the main frame body, a backrest rod connected to the rear end of the seat rod and extending backward and upward, and a connecting rod group for connecting the main frame body and the seat rod;

[0005] The front end of the main frame body is connected with a rotatable front wheel, and the rear end of the main frame body is connected with a rotatable rear wheel. The main frame body includes an upper support rod and a lower support rod arranged parallel and spaced apart in the up-down direction, and a connecting rod for connecting the upper support rod and the lower support rod into a whole. The connecting rod is located between the upper support rod and the lower support rod;

[0006] The seat rod extends in the front-rear direction, and a hinge seat extending downward is connected to the middle of the seat rod. The hinge seat is rotatably connected to the middle of the upper support rod;

[0007] The connecting rod group is located in front of the rear wheel. The connecting rod group includes an upper connecting rod, a lower connecting rod, and a telescopic air spring. The upper end of the upper connecting rod is rotatably connected to the rear end of the seat rod. The lower end of the upper connecting rod is rotatably connected to the upper end of the lower connecting rod. The lower end of the lower connecting rod is rotatably connected to the rear end of the upper support rod. The air spring is inclined from the front lower direction to the rear upper direction. The upper end of the air spring is rotatably connected to the lower end of the upper connecting rod and / or the upper end of the lower connecting rod. The lower end of the air spring is rotatably connected to the middle of the lower support rod.

[0008] Preferably, both the upper support rod and the lower support rod have a front extension section extending forward, a rear extension section extending backward, and an oblique extension section connecting between the front extension section and the rear extension section. The oblique extension section extends obliquely from the front upper direction to the rear lower direction. The connecting rod extends in the vertical direction. The upper and lower ends of the connecting rod are respectively connected to the oblique extension sections of the upper support rod and the lower support rod.

[0009] Further preferably, a wheel axle mounting plate is connected to the rear extension sections of the upper support rod and the lower support rod. The wheel axle of the rear wheel is rotatably inserted through the wheel axle mounting plate.

[0010] Further preferably, the front end of the inclined extension section of the upper support rod is rotatably connected to the hinge seat through a first rotating shaft. The front end of the rear extension section of the upper support rod is rotatably connected to the lower end of the lower connecting rod through a second rotating shaft. The rear end of the front extension section of the lower support rod is rotatably connected to the lower end of the air spring through a third rotating shaft. The third rotating shaft is located in front of and below the first rotating shaft.

[0011] Preferably, the upper connecting rod is in the shape of a boomerang with the upper and lower ends retracted and the middle protruding forward. The upper end of the upper connecting rod is rotatably connected to the rear end of the seat rod through a fourth rotating shaft. The lower end of the upper connecting rod is rotatably connected to the upper end of the lower connecting rod through a fifth rotating shaft.

[0012] Further preferably, when the air spring extends to its longest, the fifth rotating shaft is located behind the fourth rotating shaft and directly above the wheel axle of the rear wheel.

[0013] Further preferably, the upper end of the air spring is rotatably connected to the fifth rotating shaft, so that the upper end of the air spring is rotatably connected to the lower end of the upper connecting rod and the upper end of the lower connecting rod.

[0014] Preferably, the side bracket further includes a foot pedal assembly connected to the front end of the seat rod, and an auxiliary wheel assembly connected to the rear end of the lower support rod and extending backward and downward.

[0015] Preferably, the side bracket further includes an armrest support rod vertically connected to the middle of the seat rod and extending upward, an armrest vertically connected to the top of the armrest support rod and extending in the front-rear direction, a front bent pipe connecting the front end of the seat rod and the upper end of the armrest support rod, a rear bent pipe connecting the rear end of the seat rod and the upper end of the armrest support rod, and a side plate connected to the armrest support rod, the front bent pipe, the rear bent pipe, and the seat rod and located outside the side bracket. An unlocking handle for releasing the telescopic limitation of the gas spring is provided on the side plate.

[0016] Preferably, a detachable and vertically slidable backrest extension rod is connected to the upper end of the backrest rod, and the backrest extension rod is in the shape of a door frame.

[0017] Preferably, the rear wheel is driven by electricity, and a battery box for driving the rear wheel to rotate is also hung outside the main frame.

[0018] Preferably, the tiltable and foldable wheelchair further includes a wheelchair frame that can be folded left and right. The side brackets are arranged on the left and right sides of the wheelchair frame, and a crossbar that can be folded left and right is also connected to the upper end of the backrest rod.

[0019] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0020] The tiltable folding wheelchair provided by the present utility model includes side brackets arranged on the left and right sides. The side brackets include a main frame body extending in the front-rear direction, a seat rod located above the main frame body, a backrest rod connected to the rear end of the seat rod and extending backward and upward, and a connecting rod group for connecting the main frame body and the seat rod; by connecting a rotatable front wheel to the front end of the main frame body and a rotatable rear wheel to the rear end thereof, it includes an upper support rod and a lower support rod arranged in parallel at intervals in the up-down direction, and a connecting rod for connecting the upper support rod and the lower support rod into a whole, with the connecting rod located between the upper support rod and the lower support rod; the seat rod extends in the front-rear direction, and a hinged seat extending downward is connected to the middle of the seat rod, and the hinged seat is rotatably connected to the middle of the upper support rod; the connecting rod group is located in front of the rear wheel and includes an upper connecting rod, a lower connecting rod, and a telescopic air spring. The upper end of the upper connecting rod is rotatably connected to the rear end of the seat rod, the lower end of the upper connecting rod is rotatably connected to the upper end of the lower connecting rod, the lower end of the lower connecting rod is rotatably connected to the rear end of the upper support rod, the air spring is inclined from the front lower direction to the rear upper direction, and its upper end is rotatably connected to the lower end of the upper connecting rod and / or the upper end of the lower connecting rod, and the lower end of the air spring is rotatably connected to the middle of the lower support rod. It can make the lower connecting rod, the air spring, and the main frame body form a crank-slider mechanism, and can also make the upper connecting rod, the seat rod, the main frame body, and the air spring form a four-bar mechanism with a telescopic rod. Since the two mechanisms share the air spring, the two mechanisms can be driven to move by the expansion and contraction of the air spring, thereby realizing the tilting action. By locking the current length of the air spring, the tilting angle can be locked. It has good stability and can realize stepless adjustment. There is no need to set side plates with chutes, and the occupied volume is relatively small, which can meet the needs of consumers for miniaturization and convenience. At the same time, in the early stage of the elongation of the air spring, the four-bar mechanism basically does not move except for the upper connecting rod. The rotation connection part of the upper connecting rod and the lower connecting rod is mainly moved backward by the crank-slider mechanism, and then the support point of the seat rod during tilting is moved backward, making it closer to the vertical plane where the rear wheel axle is located, thereby further improving the stability of the tiltable folding wheelchair during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , Figure 2 , Figure 3 are the left view schematic diagrams of the preferred embodiment of the present utility model. Among them, Figure 1 not tilted, Figure 3 tilted to the maximum angle, Figure 2 in the tilting process.

[0022] Figure 4 is Figure 1 the three-dimensional schematic diagram of

[0023] Figure 5 is Figure 2 the three-dimensional schematic diagram of

[0024] Figure 6Yes Figure 1 Schematic diagram after hiding the left rear wheel.

[0025] Wherein: 1. Wheelchair frame; 2. Side bracket; 3. Front wheel; 4. Rear wheel; 5. Front wheel fork; 6. Axle mounting plate; 10. Main frame body; 111. Front extension section; 112. Rear extension section; 113. Inclined extension section; 121. Front extension section; 122. Rear extension section; 123. Inclined extension section; 13. Connecting rod; 14. Battery box; 20. Seat rod; 21. Hinge seat; 211. First rotating shaft; 30. Backrest rod; 31. Backrest extension rod; 32. Cross bar; 41. Upper connecting rod; 411. Fourth rotating shaft; 412. Fifth rotating shaft; 42. Lower connecting rod; 421. Second rotating shaft; 43. Gas spring; 431. Third rotating shaft; 51. Footrest assembly; 52. Auxiliary wheel assembly; 53. Armrest support rod; 54. Armrest; 541. Controller; 55. Front elbow pipe; 56. Rear elbow pipe; 57. Side plate. Detailed implementation mode

[0026] 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 the patient when sitting on the tiltable folding wheelchair provided by the present utility model.

[0027] As Figures 1 to 6 shown, the tiltable folding wheelchair provided by the present utility model includes a wheelchair frame 1 that can be folded left and right, side brackets 2 provided on the left and right sides of the wheelchair frame 1, a front wheel 3, and a rear wheel 4. The side bracket 2 includes a main frame body 10 extending in the front-back direction, a seat rod 20 located above the main frame body 10, a backrest rod 30 connected to the rear end of the seat rod 20 and extending backward and upward, and a connecting rod group for connecting the main frame body 10 and the seat rod 20; a rotatable front wheel 3 is connected to the front end of the main frame body 10, a rotatable rear wheel 4 is connected to the rear end of the main frame body 10, and the rotation axis lines of the front wheel 3 and the rear wheel 4 extend horizontally in the left-right direction. The main frame body 10 includes an upper support rod and a lower support rod that are parallel and spaced apart in the up-down direction, and a connecting rod 13 for connecting the upper support rod and the lower support rod into a whole. The connecting rod 13 is located between the upper support rod and the lower support rod; the seat rod 20 extends in the front-back direction, and a downward-extending hinge seat 21 is connected to the middle of the seat rod 20. The hinge seat 21 is rotatably connected to the middle of the upper support rod; the connecting rod group is located in front of the rear wheel 4. The connecting rod group includes an upper connecting rod 41, a lower connecting rod 42, and a telescopic gas spring 43. The upper end of the upper connecting rod 41 is rotatably connected to the rear end of the seat rod 20, the lower end of the upper connecting rod 41 is rotatably connected to the upper end of the lower connecting rod 42, the lower end of the lower connecting rod 42 is rotatably connected to the rear end of the upper support rod, the gas spring 43 is inclined from the front lower direction to the rear upper direction, the upper end of the gas spring 43 is rotatably connected to the lower ends of the upper connecting rod 41 and the lower connecting rod 42, and the lower end of the gas spring 43 is rotatably connected to the middle of the lower support rod.

[0028] The advantage of such a setting is that it can not only form a crank-slider mechanism with the lower link, the gas spring, and the main frame body, but also form a four-bar mechanism with a telescopic rod with the upper link, the seat rod, the main frame body, and the gas spring. Since the two mechanisms share the gas spring, the telescoping of the gas spring can drive the two mechanisms to move, thereby driving the movement of each rod to achieve the reclining action. By locking the current length of the gas spring, the reclining angle can be locked. It has good stability and can achieve stepless adjustment. There is no need to set side plates with sliding grooves, and the occupied volume is relatively small, which can meet the needs of consumers for miniaturization and convenience. At the same time, in the early stage of the elongation of the gas spring, the four-bar mechanism basically does not move except for the upper link. The rotation connection part between the upper link and the lower link is mainly moved backward through the crank-slider mechanism, and then the support point of the seat rod during reclining is moved backward, making it closer to the vertical plane where the rear wheel axle is located, thereby further improving the stability of the reclining and folding wheelchair during use.

[0029] In this embodiment, the upper support rod has a front extension section 111 extending forward, a rear extension section 112 extending backward, and an oblique extension section 113 connecting between the front extension section 111 and the rear extension section 112. The oblique extension section 113 extends obliquely downward from the front upper direction. The lower support rod has a front extension section 121 extending forward, a rear extension section 122 extending backward, and an oblique extension section 123 connecting between the front extension section 121 and the rear extension section 122. The oblique extension section 123 extends obliquely downward from the front upper direction. The connecting rod 13 extends in the vertical direction. The upper end of the connecting rod 13 is connected to the rear end of the oblique extension section 113 of the upper support rod, and the lower end of the connecting rod 13 is connected to the rear end of the oblique extension section 123 of the lower support rod.

[0030] The front end of the front extension section 121 of the lower support rod is connected with a rotatable front wheel fork 5. The rotation axis line of the front wheel fork 5 extends vertically in the vertical direction. The front wheel fork 5 is fork-mounted on the rotatable front wheel 3. The rear ends of the rear extension section 112 of the upper support rod and the rear extension section 121 of the lower support rod are connected with a wheel axle mounting plate 6. The wheel axle of the rear wheel 4 is rotatably passed through the wheel axle mounting plate 6.

[0031] In this embodiment, the front end of the inclined extension section 113 of the upper support rod is rotationally connected to the hinge seat 21 through a first rotating shaft 211. The front end of the rear extension section 112 of the upper support rod is rotationally connected to the lower end of the lower link 42 through a second rotating shaft 421. The rear end of the front extension section 121 of the lower support rod is rotationally connected to the lower end of the gas spring 43 through a third rotating shaft 431. The third rotating shaft 431 is located in front of and below the first rotating shaft 211.

[0032] Further, the upper link 41 is in the shape of a boomerang with the upper and lower ends retracted and the middle protruding forward. The upper end of the upper link 41 is rotatably connected to the rear end of the seat rod 20 through a fourth rotating shaft 411, and the lower end of the upper link 41 is rotatably connected to the upper end of the lower link 42 through a fifth rotating shaft 412. The upper end of the gas spring 43 is rotatably connected to the fifth rotating shaft 412, realizing the rotational connection between the upper end of the gas spring 43, the lower end of the upper link 41, and the upper end of the lower link 42.

[0033] To improve the stability of the tiltable and foldable wheelchair during use, further, when the gas spring 43 extends to its longest, the fifth rotating shaft 412 is located behind the fourth rotating shaft 411, and the fifth rotating shaft 412 is directly above the axle of the rear wheel 4.

[0034] To further improve the comfort and convenience of the tiltable and foldable wheelchair during use, in this embodiment, the side bracket 2 further includes a footrest assembly 51 connected to the front end of the seat rod 20, an auxiliary wheel assembly 52 connected to the rear end of the rear extension section 122 of the lower support rod and extending backward and downward, an armrest support rod 53 vertically connected to the middle of the seat rod 20 and extending upward, an armrest 54 vertically connected to the top of the armrest support rod 53 and extending in the front-back direction, a front bent pipe 55 connecting the front end of the seat rod 20 and the upper end of the armrest support rod 53, a rear bent pipe 56 connecting the rear end of the seat rod 20 and the upper end of the armrest support rod 53, and a side plate 57 connected to the armrest support rod 53, the front bent pipe 55, the rear bent pipe 56, and the seat rod 20 and located outside the side bracket 2. An unlocking handle (not shown in the figure) for releasing the telescopic limit of the gas spring 43 is provided on the side plate 57. When the tiltable and foldable wheelchair is in the unfolded state, the patient sits on the cushion supported by the seat rod 20 and relies on the backrest supported by the backrest rod 30. When reclining is needed, by operating the controller, the gas spring 43 is unlocked, and then a backward reliance force is applied to reduce the resistance to the elongation of the gas spring 43. The gas spring 43 elongates and pushes the fifth rotating shaft 412 backward, causing the upper link 41 to rotate backward around the fourth rotating shaft 411 and the lower link 42 to rotate backward around the second rotating shaft 421. In the first part of this process, due to the rotation of the upper link 41 and the elongation of the gas spring 43, the rotation amplitude of the seat rod 20 is small and the patient's posture changes little. After the fifth rotating shaft 412 is pushed above the rear wheel 4, the rotation amplitude of the seat rod 20 increases until it changes to the fully reclined state.

[0035] To improve the reliability of the backrest and expand its usage range, in this embodiment, a detachable and vertically slidable backrest extension rod 31 is connected to the upper end of the backrest rod 30. The backrest extension rod 31 is in the shape of a door frame, and a horizontally foldable crossbar 32 is also connected to the upper end of the backrest rod 30.

[0036] For convenient use, further, the rear wheel 4 is driven by electricity, and a battery box 14 for driving the rear wheel 4 to rotate is also hung on the outer side of the main frame body 10. A controller 541 for controlling the rotation of the rear wheel 4 is connected to the front section of the armrest 54.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An inclinable folding wheelchair, comprising side brackets arranged on the left and right sides. The side brackets include a main frame body extending in the front-rear direction, a seat rod located above the main frame body, a backrest rod connected to the rear end of the seat rod and extending backward and upward, and a connecting rod group for connecting the main frame body and the seat rod; It is characterized in that: A rotatable front wheel is connected to the front end of the main frame body, and a rotatable rear wheel is connected to the rear end of the main frame body. The main frame body includes an upper support rod and a lower support rod that are parallel and spaced apart in the up-down direction, and a connecting rod for connecting the upper support rod and the lower support rod into a whole. The connecting rod is located between the upper support rod and the lower support rod; The seat rod extends in the front-rear direction, and a hinged seat extending downward is connected to the middle of the seat rod. The hinged seat is rotatably connected to the middle of the upper support rod; The connecting rod group is located in front of the rear wheel. The connecting rod group includes an upper connecting rod, a lower connecting rod, and a telescopic gas spring. The upper end of the upper connecting rod is rotatably connected to the rear end of the seat rod. The lower end of the upper connecting rod is rotatably connected to the upper end of the lower connecting rod. The lower end of the lower connecting rod is rotatably connected to the rear end of the upper support rod. The gas spring is inclined from the front lower direction to the rear upper direction. The upper end of the gas spring is rotatably connected to the lower end of the upper connecting rod and / or the upper end of the lower connecting rod. The lower end of the gas spring is rotatably connected to the middle of the lower support rod.

2. The tiltable folding wheelchair according to claim 1, wherein: Both the upper support rod and the lower support rod have a front extension section extending forward, a rear extension section extending backward, and an inclined extension section connected between the front extension section and the rear extension section. The inclined extension section extends obliquely from the front upper direction to the rear lower direction. The connecting rod extends in the up-down direction. The upper and lower ends of the connecting rod are respectively connected to the inclined extension sections of the upper support rod and the lower support rod.

3. The tiltable folding wheelchair according to claim 2, characterized in that: Wheel axle mounting plates are connected to the rear extension sections of the upper support rod and the lower support rod. The wheel axle of the rear wheel is rotatably passed through the wheel axle mounting plates.

4. The tiltable folding wheelchair according to claim 2, wherein: The front end of the inclined extension section of the upper support rod is rotatably connected to the hinged seat through a first rotating shaft. The front end of the rear extension section of the upper support rod is rotatably connected to the lower end of the lower connecting rod through a second rotating shaft. The rear end of the front extension section of the lower support rod is rotatably connected to the lower end of the gas spring through a third rotating shaft. The third rotating shaft is located in front of and below the first rotating shaft.

5. The tiltable folding wheelchair according to claim 1, wherein: The upper connecting rod is in the shape of a boomerang with the upper and lower ends retracted backward and the middle protruding forward. The upper end of the upper connecting rod is rotatably connected to the rear end of the seat rod through a fourth rotating shaft. The lower end of the upper connecting rod is rotatably connected to the upper end of the lower connecting rod through a fifth rotating shaft.

6. The tiltable folding wheelchair according to claim 5, wherein: When the gas spring extends to the longest, the fifth rotating shaft is located behind the fourth rotating shaft, and the fifth rotating shaft is located directly above the wheel axle of the rear wheel.

7. The tiltable and foldable wheelchair according to claim 5, wherein: The upper end of the gas spring is rotatably connected to the fifth rotating shaft, so that the upper end of the gas spring is rotatably connected to the lower end of the upper connecting rod and the upper end of the lower connecting rod.

8. The tiltable folding wheelchair according to claim 1, wherein: The side bracket further includes a foot pedal assembly connected to the front end of the seat rod, and an auxiliary wheel assembly connected to the rear end of the lower brace and extending backward and downward.

9. The tiltable folding wheelchair according to claim 1, characterized in that: The side bracket further includes an armrest brace vertically connected to the middle of the seat rod and extending upward, an armrest vertically connected to the top of the armrest brace and extending in the front-rear direction, a front bent pipe connecting the front end of the seat rod and the upper end of the armrest brace, a rear bent pipe connecting the rear end of the seat rod and the upper end of the armrest brace, and a side plate connected to the armrest brace, the front bent pipe, the rear bent pipe, and the seat rod and located outside the side bracket. An unlocking handle for releasing the telescopic limitation of the gas spring is provided on the side plate.

10. The tiltable folding wheelchair according to claim 1, characterized in that: A detachable and vertically slidable backrest extension rod is connected to the upper end of the backrest rod, and the backrest extension rod is in a door frame shape.

11. The tiltable folding wheelchair according to claim 1, characterized in that: The rear wheel is driven by electricity, and a battery box for driving the rear wheel to rotate is also hung outside the main frame body.

12. The tiltable folding wheelchair according to claim 1, wherein: The tiltable folding wheelchair further includes a wheelchair frame that can be folded left and right. The side brackets are arranged on the left and right sides of the wheelchair frame, and a crossbar that can be folded left and right is also connected to the upper end of the backrest rod.

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