Foldable lift wheelchair

Abstract

The utility model belongs to the technical field of folding lifting wheelchair, especially a folding lifting wheelchair, in view of the problem of the existing technology that the handle is exposed and is easy to be touched by mistake, the lifting function of wheelchair cannot be normally used, the user encounters difficulty in using at different height scenes, thereby influence use effect, the following scheme is presented, it includes base, the bottom fixed mounting of base has four universal wheel, the top center fixed mounting of base has fixed seat, the inside of fixed seat is provided with lifting groove, the inside sliding installation of lifting groove has lifting block, the top fixed mounting of lifting block has pad seat, the top front and back both sides fixed mounting of pad seat has the handle, the top rotation of pad seat has back, the left side fixed mounting of back has the push -hand, the utility model can hide handle, avoid handle exposure and lead to touch by mistake, can lift wheelchair, prevent the user to use inconveniently at different height scenes, improve use effect.

Description

Technical Field

[0001] This application relates to the field of folding and height-adjustable wheelchair technology, and in particular to foldable and height-adjustable wheelchairs. Background Technology

[0002] With the accelerating aging of the global population and the upgrading of travel needs among people with mobility impairments, the pain points of traditional wheelchairs, such as their large weight, inconvenient folding, and inability to fit into dining tables or cars, are becoming increasingly prominent. The application of lightweight materials such as carbon fiber and aerospace-grade aluminum alloy, as well as mechanical innovations in folding mechanisms and lifting systems, have enabled products to achieve quick one-handed folding and significant reduction in size, while also possessing height adjustment capabilities, making them suitable for use in all scenarios, including home, public transportation, and outdoors. Currently, the industry is transforming from basic mobility aids to "portable, comfortable, and adaptable to all scenarios," and the market size continues to expand. Domestic products have significant advantages in core technology self-sufficiency and cost control, not only meeting domestic needs but also accelerating their entry into the global market through cross-border e-commerce, becoming key equipment for improving the independence and dignity of people with mobility impairments.

[0003] Existing technologies often result in exposed handles that are easily accidentally touched, making the wheelchair lifting function unusable and causing difficulties for users in different height scenarios, thus affecting the overall usability. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as exposed handles that are easily accidentally touched, wheelchair lifting functions that cannot be used properly, and difficulties encountered by users in different height scenarios, thus affecting the usability. The proposed invention is a foldable lifting wheelchair.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Foldable and height-adjustable wheelchairs, including: The base includes four casters fixedly mounted on its bottom, a fixed seat fixedly mounted on its top center, a lifting groove inside the fixed seat, a lifting block slidably mounted inside the lifting groove, a pad fixedly mounted on top of the lifting block, armrests fixedly mounted on the front and rear sides of the top of the pad, a backrest rotatably mounted on the top of the pad, a push handle fixedly mounted on the left side of the backrest, and a foot pedal rotatably mounted on the front of the fixed seat; it also includes: A folding mechanism, located at the top of the cushion, is used to fold the backrest. A lifting mechanism, located on top of the base, is used to raise and lower the pad. A rotating concealed handle mechanism is located on the top of the base.

[0006] Preferably, the folding mechanism includes a rotating shaft rotatably mounted inside the pad, a worm gear mounted on the outside of the rotating shaft, and a worm rotatably mounted inside the pad.

[0007] Preferably, the worm gear one and the worm wheel one mesh with each other, and a crank handle one is fixedly installed on the outside of the worm gear one.

[0008] Preferably, the lifting mechanism includes a screw rod rotatably installed inside the fixed base, a connecting block threaded to the outside of the screw rod, the bottom side of the connecting block being fixedly connected to the top side of the lifting block, the outside of the connecting block being slidably connected to the lifting groove, a first sprocket fixedly installed on the outside of the screw rod, a worm gear rotatably installed inside the fixed base, a rotating block fixedly installed on the outside of the worm gear rotatably, and the worm gear rotatably installed at the front end of the connecting block.

[0009] Preferably, the worm gear two meshes with a worm wheel two, a rotating rod is fixedly installed on the top of the worm wheel two, the outside of the rotating rod is rotatably connected to the inside of the fixed seat, a second sprocket is fixedly installed on the outside of the rotating rod, and a chain meshes with the first sprocket on the second sprocket.

[0010] Preferably, the rotary concealed handle mechanism includes an arc-shaped groove disposed at the center of the rotating block, a rotating rod rotatably mounted inside the arc-shaped groove, and a concealed crank and a first bevel gear fixedly mounted outside the rotating rod.

[0011] Preferably, the first bevel gear meshes with a second bevel gear, a rotating shaft is fixedly mounted on the second bevel gear, the outside of the rotating shaft is rotatably connected to the inside of the rotating block, a worm gear three is fixedly mounted on the outside of the rotating shaft, and the worm gear three meshes with a worm three.

[0012] Preferably, the worm gear three is rotatably connected to the outside of the rotating block, and a rotating handle is fixedly installed on the outside of the worm gear three.

[0013] The beneficial effects of the foldable and height-adjustable wheelchair in this invention are as follows: Because of the folding mechanism, the rotation of the pivot will drive the backrest to fold around the pivot point of the cushion. The worm gear mechanism has a self-locking function, which can keep the backrest stable at any folding angle and prevent accidental rotation during use. Because of the lifting mechanism, the height of the wheelchair can be flexibly adjusted to meet the needs of different usage scenarios and users. It can ensure the comfort and safety of users when adjusting the height. Whether in a relatively narrow indoor space or in a complex and varied outdoor terrain, the height of the wheelchair can be quickly and accurately adjusted to the appropriate position according to actual needs, which greatly improves the practicality and applicability of the wheelchair and brings more convenience to users' travel and life. Because of the rotating hidden handle mechanism, the rotating rod rotates in the arc groove, which turns the hidden crank out of the arc groove. After the hidden crank is turned out, rotating it will drive the rotating block to rotate, thereby triggering the lifting mechanism to work. After use, the hidden crank can be reset and stored in the arc groove by turning the handle in the opposite direction.

[0014] This invention can conceal the handle, preventing accidental activation due to exposed handles, and can raise and lower the wheelchair to prevent inconvenience for users in different height scenarios, thus improving the user experience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the foldable and height-adjustable wheelchair proposed in this utility model; Figure 2 The right view is a structural schematic diagram of the foldable and height-adjustable wheelchair proposed in this utility model. Figure 3 This is a schematic diagram of the internal structure of the rotating block of the foldable and height-adjustable wheelchair proposed in this utility model. Figure 4 This is a top view structural diagram of the rotating block of the foldable and height-adjustable wheelchair proposed in this utility model; Figure 5 The foldable and height-adjustable wheelchair proposed in this utility model Figure 1 Enlarged structural diagram of section A; Figure 6 The foldable and height-adjustable wheelchair proposed in this utility model Figure 3 Enlarged structural diagram of section B; Figure 7 This is a three-dimensional structural diagram of the foldable and height-adjustable wheelchair proposed in this utility model.

[0016] Reference numerals in the attached diagram: 1. Base; 2. Casters; 3. Fixed seat; 4. Lifting block; 5. Cushion; 6. Armrest; 7. Backrest; 8. Push handle; 9. Foot pedal; 10. Crank handle one; 11. Worm gear one; 12. Worm wheel one; 13. Rotating shaft; 14. Rotating block; 15. Worm gear two; 16. Worm wheel two; 17. Rotating rod; 18. Second sprocket; 19. Chain; 20. First sprocket; 21. Screw one; 22. Connecting block; 23. Concealed crank handle; 24. Rotating handle; 25. Worm gear three; 26. Worm wheel three; 27. Rotating shaft; 28. Second bevel gear; 29. ​​First bevel gear; 30. Rotating rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0018] Reference Figures 1-7 Foldable and height-adjustable wheelchairs, including: The base 1 is made of high-strength aluminum alloy with a tensile strength ≥300MPa. Four casters 2 are fixedly installed at the bottom of the base 1. The caster body is made of polyurethane, and the rims are made of ABS engineering plastic. A fixed seat 3 is fixedly installed at the center of the top of the base 1. The fixed seat 3 is made of Q235 low-carbon steel with an electrophoretic anti-rust treatment. A lifting groove is provided inside the fixed seat 3, and a lifting block 4 is slidably installed inside the lifting groove. The lifting block 4 is made of 6061 aluminum alloy with an anodized surface. A pad 5 is fixedly installed on top of the lifting block 4. The pad 5 has an aluminum alloy frame, is covered with 50mm thick high-density memory foam, and is covered with waterproof and wear-resistant nylon cloth. Armrests 6 are fixedly installed on the front and rear sides of the top of the pad 5. A backrest 7 is rotatably installed on the top of the pad 5. A push handle 8 is fixedly installed on the left side of the backrest 7. A foot pedal 9 is rotatably installed at the front of the fixed seat 3. The foot pedal 9 is made of PA66+30% glass fiber reinforced engineering plastic, and its surface has anti-slip texture. It also includes: A folding mechanism, located at the top of the cushion 5, is used to fold the backrest 7. A lifting mechanism is located on the top of the base 1 and is used to lift the pad 5. A rotating concealed handle mechanism is located at the top of base 1.

[0019] In this embodiment, the folding mechanism includes a rotating shaft 13 rotatably mounted inside the pad 5, a worm gear 12 mounted on the outside of the rotating shaft 13, and a worm 11 rotatably mounted inside the pad 5.

[0020] In this embodiment, the worm gear 11 and the worm wheel 12 mesh with each other, and a crank handle 10 is fixedly installed on the outside of the worm gear 11.

[0021] In this embodiment, the lifting mechanism includes a screw 21 rotatably mounted inside the fixed base 3. The screw 21 is made of 40Cr with a nitrided surface and has a trapezoidal thread Tr30×6, which is wear-resistant and has a strong load-bearing capacity. The screw 21 is externally threaded to a connecting block 22, which is made of QT450-10 ductile iron with high strength and good machinability. The bottom side of the connecting block 22 is fixedly connected to the top side of the lifting block 4, and the outside of the connecting block 22 is slidably connected to the lifting groove. A first sprocket 20 is fixedly mounted on the outside of the screw 21. A worm gear 15 is rotatably mounted inside the fixed base 3. A rotating block 14 is fixedly mounted on the outside of the worm gear 15. The worm gear 15 is located at the front end of the connecting block 22.

[0022] In this embodiment, the second worm gear 15 meshes with the second worm wheel 16, and a rotating rod 17 is fixedly installed on the top of the second worm wheel 16. The outside of the rotating rod 17 is rotatably connected to the inside of the fixed base 3. A second sprocket 18 is fixedly installed on the outside of the rotating rod 17, and a chain 19 meshes with the first sprocket 20.

[0023] When the height of the wheelchair needs to be adjusted, the user can rotate the rotating block 14. The rotating block 14 drives the worm gear 15 to rotate. Since the worm gear 15 meshes with the worm wheel 16, the worm wheel 16 will rotate accordingly, which in turn drives the rotating rod 17 to rotate. The rotation of the rotating rod 17 causes the second sprocket 18 fixed on it to rotate. The second sprocket 18 drives the first sprocket 20 to rotate through the chain 19. The first sprocket 20 then drives the screw 21 to rotate. When the screw 21 rotates, the connecting block 22, which is threaded to its external side, will move up and down along the screw 21. Because the bottom side of the connecting block 22 is fixedly connected to the top side of the lifting block 4, and the outside of the connecting block 22 is slidably connected to the lifting groove, the up and down movement of the connecting block 22 will drive the lifting block 4 to move up and down in the lifting groove, thereby realizing the adjustment of the wheelchair height. This lifting mechanism is reasonably designed, compact in structure, and easy to operate, and can meet the needs of different users for wheelchair height.

[0024] In this embodiment, the rotary hidden handle mechanism includes an arc-shaped groove located at the center of the rotating block 14. A rotating rod 30 is rotatably mounted inside the arc-shaped groove, and a hidden crank 23 and a first bevel gear 29 are fixedly mounted outside the rotating rod 30. The hidden crank 23 can rotate around the rotating rod 30. When the crank is needed to operate the relevant mechanism, the hidden crank 23 can be rotated out from the arc-shaped groove for easy gripping and operation by the user. When the crank is not needed, it can be rotated back into the arc-shaped groove for hiding. This not only makes the overall appearance of the wheelchair more concise and beautiful, but also avoids the crank from colliding and interfering with other objects during the movement of the wheelchair. At the same time, the first bevel gear 29 cooperates with subsequent related gear structures to realize the transmission and conversion of power to complete the operation of other functions of the wheelchair.

[0025] In this embodiment, the first bevel gear 29 meshes with the second bevel gear 28, and a rotating shaft 27 is fixedly installed on the second bevel gear 28. The outside of the rotating shaft 27 is rotatably connected to the inside of the rotating block 14. A worm gear 3 26 is fixedly installed on the outside of the rotating shaft 27. The worm gear 3 26 meshes with the worm 3 25. After the hidden crank handle 23 is fully rotated into the arc groove 32, it is flush with the outer surface of the rotating block 14.

[0026] In this embodiment, the worm gear 25 is rotatably connected to the outside of the rotating block 14, and a rotating handle 24 is fixedly installed on the outside of the worm gear 25.

[0027] In this invention, during use, the four universal wheels 2 at the bottom of the base 1 enable flexible steering and movement of the wheelchair; the push handle 8 on the left side of the backrest 7 assists others in pushing it; the foot pedal 9, rotatably mounted at the front of the fixed seat 3, can be adjusted in angle according to usage needs to improve riding comfort; when the backrest 7 needs to be folded, the crank handle 10 is turned, causing the worm gear 11 to rotate. Since the worm gear 11 drives the worm wheel 12 to rotate, the worm wheel 12 drives the rotating rod 17 to rotate. The rotating shaft 13 is fixedly connected to the backrest 7, and the backrest 7 is rotatably mounted on the top of the cushion 5. Therefore, the rotation of the rotating shaft 13 will cause the backrest 7 to complete the folding action around the rotation point of the cushion 5. The worm gear-worm wheel mechanism has a self-locking function, which allows the backrest to... 7. Stably fixed at any folding angle to prevent accidental rotation during use; when the cushion 5 needs to be raised or lowered, the rotary hidden handle mechanism rotates out the hidden crank 23, rotating the hidden crank 23 drives the rotating block 14 to rotate, the rotating block 14 drives the second worm gear 15 to rotate, the second worm gear 15 drives the second worm wheel 16 to rotate, the second worm wheel 16 drives the rotating rod 17 to rotate, the rotating rod 17 drives the second sprocket 18 to rotate, which drives the first sprocket 20 to rotate through the chain 19, the first sprocket 20 drives the first screw 21 to rotate, the first screw 21 drives the connecting block 22 to move upward, the connecting block 22 will simultaneously drive the lifting block 4 to move upward, and thus drive the cushion 5 and the backrest 7 to move upward. When it is necessary to lower the cushion 5... When adjusting the height, reverse the hidden crank 23. Following the reverse transmission sequence, screw 21 rotates in the opposite direction, causing connecting block 22 to move downwards. Connecting block 22 then moves lifting block 4 downwards, thereby causing the seat 5 and backrest 7 to move downwards. This allows for flexible height adjustment of the wheelchair, meeting the needs of different usage scenarios and users. It ensures user comfort and safety when adjusting the height. Whether in a relatively narrow indoor space or in a complex and varied outdoor terrain, the wheelchair height can be quickly and accurately adjusted to the appropriate position according to actual needs, greatly improving the practicality and applicability of the wheelchair and bringing more convenience to the user's travel and life. When it is necessary to adjust the height... When the hidden crank handle 23 is hidden, it is stored in the arc-shaped groove inside the rotating block 14 by default, keeping the wheelchair's appearance simple and avoiding accidental activation. Rotating the handle 24 drives the worm gear 25 to rotate. The worm gear 25 drives the worm wheel 26 to rotate, which in turn drives the worm wheel 26 and the rotating shaft 27 to rotate. The second bevel gear 28 on the rotating shaft 27 drives the first bevel gear 29 to rotate, which in turn causes the rotating rod 30 to rotate in the arc-shaped groove, thus turning the hidden crank handle 23 out of the arc-shaped groove. After the hidden crank handle 23 is turned out, rotating it will drive the rotating block 14 to rotate, thereby triggering the lifting mechanism. After use, the hidden crank handle 23 can be reset and stored in the arc-shaped groove by reversing the operation of the handle 24. Example

[0028] The difference between this embodiment and Embodiment 1 is that an anti-slip thread is provided on the outside of the hidden crank 23. The anti-slip thread design allows the user to obtain better friction when turning the hidden crank 23. Even when the hands are sweaty or slippery, the user can operate it easily and stably, effectively avoiding operational errors caused by slipping hands. This further improves the convenience and safety of the wheelchair height adjustment process, allowing the user to control the raising and lowering of the wheelchair more freely and better adapt to various usage scenarios and needs.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A foldable, height-adjustable wheelchair, characterized in that: include: The base (1) has four casters (2) fixedly installed at its bottom, and a fixed seat (3) fixedly installed at the top center of the base (1). The fixed seat (3) has a lifting groove inside, and a lifting block (4) is slidably installed inside the lifting groove. A cushion (5) is fixedly installed on the top of the lifting block (4). Handrails (6) are fixedly installed on the front and rear sides of the top of the cushion (5). A backrest (7) is rotatably installed on the top of the cushion (5). A pusher (8) is fixedly installed on the left side of the backrest (7). A foot pedal (9) is rotatably installed on the front end of the fixed seat (3). The base also includes: A folding mechanism is provided on the top of the cushion (5) for folding the backrest (7); A lifting mechanism is located on the top of the base (1) and is used to lift the pad (5); A rotating concealed handle mechanism is located on the top of the base (1).

2. The foldable and height-adjustable wheelchair according to claim 1, characterized in that: The folding mechanism includes a rotating shaft (13) rotatably mounted inside the pad (5), a worm gear (12) is mounted on the outside of the rotating shaft (13), and a worm (11) is rotatably mounted inside the pad (5).

3. The foldable and height-adjustable wheelchair according to claim 2, characterized in that: The worm gear (11) meshes with the worm wheel (12), and a crank handle (10) is fixedly installed on the outside of the worm gear (11).

4. The foldable and height-adjustable wheelchair according to claim 1, characterized in that: The lifting mechanism includes a screw (21) rotatably installed inside the fixed base (3), a connecting block (22) is threadedly connected to the outside of the screw (21), the bottom side of the connecting block (22) is fixedly connected to the top side of the lifting block (4), the outside of the connecting block (22) is slidably connected to the lifting groove, a first sprocket (20) is fixedly installed on the outside of the screw (21), a worm gear (15) is rotatably installed inside the fixed base (3), a rotating block (14) is fixedly installed on the outside of the worm gear (15), and the worm gear (15) is located at the front end of the connecting block (22).

5. The foldable and height-adjustable wheelchair according to claim 4, characterized in that: The second worm gear (15) is engaged with the second worm wheel (16). A rotating rod (17) is fixedly installed on the top of the second worm wheel (16). The outside of the rotating rod (17) is rotatably connected to the inside of the fixed seat (3). A second sprocket (18) is fixedly installed on the outside of the rotating rod (17). The second sprocket (18) is engaged with the first sprocket (20) with a chain (19).

6. The foldable and height-adjustable wheelchair according to claim 5, characterized in that: The rotary hidden handle mechanism includes an arc-shaped groove located at the center of the rotating block (14), a rotating rod (30) is rotatably mounted inside the arc-shaped groove, and a hidden crank (23) and a first bevel gear (29) are fixedly mounted outside the rotating rod (30).

7. The foldable and height-adjustable wheelchair according to claim 6, characterized in that: The first bevel gear (29) meshes with the second bevel gear (28), and a rotating shaft (27) is fixedly installed on the second bevel gear (28). The outside of the rotating shaft (27) is rotatably connected to the inside of the rotating block (14). A worm gear (26) is fixedly installed on the outside of the rotating shaft (27), and a worm gear (26) meshes with a worm (25).

8. The foldable and height-adjustable wheelchair according to claim 7, characterized in that: The worm gear 3 (25) is rotatably connected to the inside of the rotating block (14), and a rotating handle (24) is fixedly installed on the outside of the worm gear 3 (25).

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