A detachable wheelchair tow head and wheelchair van docking and lifting device

Abstract

This invention discloses a detachable wheelchair lift and docking device. A fixing frame is used to secure it to the front of the wheelchair, and a wheelchair wheel is mounted on the bottom of the lift frame. One of the fixing frame and the lift frame is fixed to a first connecting part, and the other is fixed to a second connecting part. A shaft is laterally arranged on the first connecting part, and a mating part is provided on the second connecting part for engaging with the outer circumference of the shaft to rotate around it. The mating part and the shaft engage to allow the lift frame to swing and mount on the fixing frame, supporting the front of the wheelchair when the lift frame swings upright and lowering the front of the wheelchair when the lift frame swings tilted. A locking component is provided between the fixing frame and the lift frame to lock and unlock the relative displacement between the lift frame and the fixing frame. A shaft sliding outlet is provided on the radial side of the mating part for the shaft to slide in and out, allowing the lift frame to be detached from the fixing frame. This invention assists the user in raising and lowering the front of the wheelchair while solving the space occupation problem after the wheelchair lift is installed.

Description

Technical Field

[0001] This invention relates to the field of wheelchair tow head technology, and in particular to a detachable wheelchair tow head docking and lifting device for wheelchairs. Background Technology

[0002] There is a wheelchair tow head that is added to the front of the wheelchair. This type of wheelchair tow head extends forward of the wheelchair and has a tow wheel with a larger diameter that contacts the ground. After the wheelchair tow head is installed, the two small casters that were originally at the front of the wheelchair can be lifted, thereby improving the wheelchair's maneuverability and increasing the front-rear wheelbase, thus improving the stability of the wheelchair.

[0003] However, during the installation of the wheelchair tow head, it is usually necessary to first lift the front of the wheelchair to raise the two small casters that were originally on the front of the wheelchair, and then install and fix the wheelchair tow head on the wheelchair. Both installation and disassembly are quite inconvenient.

[0004] Installing a wheelchair tow truck increases the wheelchair's front-to-rear wheelbase, making it more space-consuming and inconvenient to store or transport in a vehicle. Furthermore, since existing wheelchairs typically lack a dedicated structure for securing the tow truck, the tow truck usually requires a complex mounting mechanism to attach to the wheelchair's frame. This mounting mechanism is often difficult to assemble and disassemble. Therefore, if the wheelchair tow truck itself could be designed as two easily detachable parts, with one part fixed to the wheelchair and the other easily detachable, the space-consuming problem during storage or transportation after installing the tow truck would be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a detachable wheelchair tow head and wheelchair docking and lifting device, which enables users to lift and lower the front of the wheelchair by means of the wheelchair tow head, and at the same time solves the space occupation problem during storage or transportation of the wheelchair after the wheelchair tow head is installed.

[0006] To achieve the above objectives, the solution of the present invention is: a detachable wheelchair tractor and wheelchair docking and lifting device, comprising a fixing frame, a tractor frame, a first connecting part, a second connecting part and a locking assembly, wherein the fixing frame is used to fix it to the front of the wheelchair, and a tractor wheel is installed at the bottom of the tractor frame;

[0007] The first connecting part is fixed on the fixed frame, and the second connecting part is fixed on the tractor frame, or the second connecting part is fixed on the fixed frame and the first connecting part is fixed on the tractor frame.

[0008] A shaft is provided laterally on the first connecting part, and a mating part is provided on the second connecting part for cooperating with the outer circumference of the shaft to rotate around the outer circumference of the shaft. The mating part and the shaft cooperate to pivotally connect the first connecting part and the second connecting part to swing the towing frame onto the fixed frame so as to support the front of the wheelchair when the towing frame swings up and lower the front of the wheelchair when the towing frame swings and tilts.

[0009] The locking assembly is located between the fixed frame and the tractor unit, and is used to lock and unlock the relative displacement between the tractor unit and the fixed frame;

[0010] The mating part is provided with a shaft slide outlet on the radial side for the shaft to slide in and out. The shaft slides out of the shaft slide outlet to remove the tractor frame from the fixed frame.

[0011] Furthermore, one of the first connecting portion and the second connecting portion is formed with a guide portion, and the other is formed with a sliding portion. When the shaft is engaged with the mating portion, the guide portion extends in an arc shape around the shaft. The sliding portion is used to confine itself within the guide portion so as to slide along the extension path of the guide portion. One end of the extension of the guide portion is provided with a sliding portion outlet for the sliding portion to slide in and out. The sliding portion outlet and the shaft outlet face different directions.

[0012] Furthermore, the sliding part extends laterally and penetrates the guide part, and a first connecting plate is provided at each end of the sliding part. The guide part is provided on a second connecting plate. When the sliding part is confined within the guide part, the second connecting plate is inserted between the two first connecting plates. The locking assembly also includes a clamping assembly for driving the two first connecting plates to clamp or release the second connecting plate.

[0013] Furthermore, the clamping assembly is a cam handle, one end of the sliding part is fixed to the first connecting plate on the corresponding side, and the other end moves through another first connecting plate. The cam handle is pivotally connected to one end of the sliding part that extends through the first connecting plate, and the pivot axis is perpendicular to the lateral extension direction of the sliding part. The cam handle has an unlocking part and a locking part that protrudes from the unlocking part around its pivot axis.

[0014] The cam handle rotates so that the locking part faces and presses against the outer side of the corresponding first connecting plate, thereby clamping the second connecting plate between the two first connecting plates, or so that the unlocking part faces the outer side of the corresponding first connecting plate, thereby releasing the second connecting plate between the two first connecting plates.

[0015] Furthermore, the locking assembly includes a pin locking assembly, which includes a pin and a pin seat. One of the first connecting part and the second connecting part is fixedly mounted on the pin seat, and the other is provided with a limit hole. The pin is slidably disposed on the pin seat. As the tractor unit rotates, the pin deviates from or aligns with the limit hole. When the pin is aligned with the limit hole, the pin is pushed outward to insert into the limit hole to lock the rotation of the tractor unit. When the pin is inserted into the limit hole, the pin is pulled inward to release the pin from the limit hole to unlock the rotation of the tractor unit.

[0016] Furthermore, the pin locking assembly also includes an elastic element and a pull wire. The elastic element is disposed between the pin and the pin seat to push the pin outward, and one end of the pull wire is connected to the tail of the pin to pull the pin inward.

[0017] Furthermore, the pin locking assembly also includes a pull cable handle, which includes a handle fixing seat and a pull cable portion. The pull cable portion is movably disposed on the handle fixing seat and connected to the pull cable.

[0018] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0019] (1) The tow wheel at the bottom of the tow frame contacts the ground, and the fixed frame is fixed to the front of the wheelchair. When the locking component unlocks the relative displacement between the tow frame and the fixed frame, the tow frame can be mounted on the fixed frame and rotated through the cooperation of the shaft and the mating part. When the tow frame is rotated to a more upright position, the pivot of the shaft and the mating part will be raised, thereby lifting the front of the wheelchair. When the tow frame is rotated to a more tilted position, the pivot of the shaft and the mating part will be lowered, thereby lowering the front of the wheelchair. By locking the relative displacement between the tow frame and the fixed frame through the locking component, the front of the wheelchair can be kept raised at a predetermined height. Thus, during the installation and removal of the wheelchair tow frame, the user does not need to keep lifting the front of the wheelchair, making the installation and removal of the wheelchair headrest more convenient.

[0020] (2) A shaft sliding outlet is provided on the radial side of the mating part for the shaft to slide in and out. When the locking assembly unlocks the relative displacement between the tractor frame and the fixed frame, the shaft can slide out of the shaft sliding outlet to remove the tractor frame from the fixed frame. Therefore, during transportation or storage, it is not necessary to remove the fixed frame from the wheelchair. Only the tractor frame needs to be removed from the fixed frame, so that the wheelchair and tractor frame with the fixed frame installed can be placed separately, which takes up less space and is more convenient to use. Attached Figure Description

[0021] Figure 1 A schematic diagram showing the structure of the wheelchair's front casters on the ground;

[0022] Figure 2 A schematic diagram showing the structure of the wheelchair's front casters lifting off the ground;

[0023] Figure 3 A three-dimensional structural diagram of the wheelchair trolley head;

[0024] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0025] Figure 5 A schematic diagram of a partial cross-sectional structure of the wheelchair trolley head;

[0026] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0027] Figure 7 A schematic diagram of the structure when a pin is inserted into a limiting hole;

[0028] Figure 8 A schematic diagram showing the structure when the pin is inserted into another limiting hole;

[0029] Figure 9 A schematic diagram of the cross-sectional structure of the pin extending outward from the pin seat;

[0030] Figure 10 A schematic diagram of the cross-sectional structure of the pin sliding into the pin seat;

[0031] Figure 11 This is a schematic diagram of the cross-sectional structure of the pull cable handle;

[0032] Figure 12 A schematic diagram of another section of the wheelchair trolley head;

[0033] Figure 13 for Figure 12 A magnified view of a section at point C;

[0034] Figure 14 This is a three-dimensional structural diagram of the tractor unit;

[0035] Figure 15 for Figure 14 A magnified view of a section at point D;

[0036] Figure 16 This is a three-dimensional structural diagram of the fixing frame.

[0037] Labeling Explanation: 1-Fixed Frame, 2-Trailer Frame, 3-Wheelchair, 5-Trailer Wheel, 6-Pin Locking Assembly, 7-First Connecting Part, 8-Second Connecting Part, 9-Shaft, 10-Matching Part, 11-Shaft Slide Outlet, 12-Guide Part, 13-Sliding Part, 14-Sliding Part Slide Outlet, 15-Pin, 16-Pin Seat, 17-Limiting Hole, 18-Elastic Element, 19-Pull Cable, 20-Pull Cable Handle, 21-Handle Fixing Seat, 22-Pull Cable Part, 23-First Connecting Plate, 24-Second Connecting Plate, 25-Cam Handle, 26-Unlocking Part, 27-Locking Part, 28-Universal Wheel, 29-Flexible Sleeve, 30-Rear Wheel. Detailed Implementation

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] This invention provides a detachable wheelchair tow head and wheelchair lifting device, combined with... Figure 1-16As shown, the assembly includes a fixing frame 1, a tow head frame 2, a first connecting part 7, a second connecting part 8, and a locking assembly. The fixing frame 1 is used to fix the wheelchair 3 to the wheelchair 3. The fixing method is not specifically limited; any existing fixing structure between the wheelchair tow head and the wheelchair 3 can be used to fix it to the wheelchair 3. This is prior art and will not be specifically described in this embodiment. The first connecting part 7 is fixed to the fixing frame 1, and the second connecting part 8 is fixed to the tow head frame 2, or the second connecting part 8 is fixed to the fixing frame 1, and the first connecting part 7 is fixed to the tow head frame 2. A shaft 9 is laterally arranged on the first connecting part 7, and a fitting part 10 is provided on the second connecting part 8 for engaging with the outer circumference of the shaft 9 to rotate around the outer circumference of the shaft 9. The fitting part 10 and the shaft 9 engage to pivotally connect the first connecting part 7 and the second connecting part 8, allowing the tractor frame 2 to be swung and mounted on the fixed frame 1. A tractor wheel 5 is mounted on the bottom of the tractor frame 2. When the tractor frame 2 is mounted on the fixed frame 1, the tractor wheel 5 can roll on the ground to support the front of the wheelchair 3 when the tractor frame 2 is swung and erected, allowing the wheels to... The casters 28 at the front of the chair 3 are off the ground. During use, the wheelchair travels via the tow head wheels 5 and the rear wheels 30 of the wheelchair 3. When the tow head frame 2 is tilted further, the pivot between the tow head frame 2 and the fixed frame 1 is lowered, causing the front of the wheelchair 3 to descend, and the casters 28 to fall back to the ground. This facilitates the removal of the entire wheelchair tow head from the wheelchair 3 and the tow head frame 2 from the fixed frame 1. The locking assembly is located between the fixed frame 1 and the tow head frame 2, used to lock and unlock the connection between the tow head frame 2 and the fixed frame 1. Regarding displacement, the structure of the locking assembly is not specifically limited and can be any existing mechanism capable of locking or unlocking the relative displacement between two components. Thus, by locking the relative displacement between the tractor frame 2 and the fixed frame 1, the tractor frame 2 can be fixed at a predetermined swing angle. The mating part 10 is provided with a shaft slide outlet 11 on one radial side for the shaft 9 to slide in and out. The shaft 9 slides out of the shaft slide outlet 11 to remove the tractor frame 2 from the fixed frame 1, making it easier to transport the tractor frame 2 after removal.

[0040] To prevent the shaft 9 from accidentally sliding out of the shaft slide outlet 11 during use, which would cause the tractor frame 2 to become loose from the fixing frame 1, one of the first connecting part 7 and the second connecting part 8 has a guide part 12, and the other has a sliding part 13. When the shaft 9 is engaged with the mating part 10, the guide part 12 extends in an arc shape around the shaft 9, and the sliding part 13 is used to confine itself within the guide part 12 so as to slide along the extension path of the guide part 12. One end of the extended guide part 12 has a sliding part slide outlet 14 for the sliding part 13 to slide in and out. The sliding part slide outlet 14 and the shaft The sliding outlet 11 faces different directions. Only when the tractor frame 2 is rotated to a predetermined limit angle, allowing the sliding part 13 to slide out of the sliding outlet 14, can the shaft 9 slide out of the mating part 10, thus separating the fixing frame 1 and the tractor frame 2. In a more specific embodiment, the first connecting part 7 is fixed to the tractor frame 2. The first connecting part 7 is located at the rear of the tractor frame 2 and has two longitudinally arranged and laterally spaced first connecting plates 23. The shaft 9 is fixed between the two first connecting plates 23, and the sliding part 13 is arranged parallel above the shaft 9. The rod-shaped part is inserted between the two first connecting plates 23; the second connecting part 24 is fixed on the fixing frame 1 and has a longitudinally extending second connecting plate 24. The second connecting plate 24 is used to be disassembled between the two first connecting plates 23. The mating part 10 is formed on the second connecting plate 24. The shaft sliding outlet 11 is located at the bottom end of the second connecting plate 24. That is, the mating part 10 is a long notch that runs through the second connecting plate 24 from left to right and is open at the bottom. The top of the notch is an arc shape with the same diameter as the shaft 9. The guide portion 12 is also formed on the second connecting plate 24. The sliding part slide outlet 14 is located at the front end of the second connecting plate 24. The guide portion 12 passes through the second connecting plate 24 from left to right. During installation, the second connecting plate 24 is aligned and inserted between the two first connecting plates 23. Then, the shaft 9 is aligned with the shaft slide outlet 11. The tractor frame 2 is then lifted up so that the shaft 9 slides into the mating part 10. Then, the top of the tractor frame 2 is swung back, and the sliding part 13 enters the guide portion 12 from the sliding part slide outlet 14. The disassembly process is the reverse. It will not be described in detail in this embodiment.

[0041] Specifically, in this embodiment, the locking assembly includes a pin locking assembly 6, which includes a pin 15 and a pin seat 16. One of the first connecting portion 7 and the second connecting portion 8 is fitted with and fixed to the pin seat 16, while the other is provided with a limiting hole 17. Specifically, in this embodiment, the pin seat 16 is fixed to the outside of a first connecting plate 23 of the first connecting portion 7. The pin 15 is slidably disposed laterally on the pin seat 16 and passes through the first connecting plate 23 that fixes the pin seat 16. The limiting hole 17 is open laterally. On the second connecting plate 24, multiple limiting holes 17 can be spaced out (each limiting hole 17 corresponds to a predetermined swing angle of the tractor frame 2). When the shaft 9 engages with the mating part 10, the distance from the axis of each limiting hole 17 to the axis of the shaft 9 is equal to the distance from the axis of the pin 15 to the axis of the shaft 9. Therefore, as the tractor frame 2 swings, the pin 15 deviates from or aligns with one of the limiting holes 17. When the pin 15 aligns with a limiting hole 17, the head of the pin 15 is pushed outward and inserted into the limiting hole 17. To lock the rotation of the tractor frame 2, when the pin 15 is inserted into the limiting hole 17, the rotation of the tractor frame 2 is unlocked by pulling the pin 15 out of the limiting hole 17. The mechanism for driving the pin 15 to slide inward and outward is not specifically limited. Specifically, in this embodiment, the pin locking assembly 6 also includes an elastic element 18, a pull wire 19, a flexible sleeve 29, and a pull wire handle 20. The elastic element 18 (preferably a spring in this embodiment) is disposed between the pin 15 and the pin seat 16. The pull wire 19 passes through the outward push of the pin 15. Within a flexible sleeve 29, one end of the flexible sleeve 29 is connected and fixed to the tail of the pin seat 16. A pull wire 19 extends out of the flexible sleeve 29 at this end and is connected and fixed to the tail of the pin 15. The pull wire handle 20 includes a handle fixing seat 21 and a pull wire part 22 movably disposed on the handle fixing seat 21. The other end of the flexible sleeve 29 is connected and fixed to the handle fixing seat 21. The pull wire 19 extends out of the flexible sleeve at this end and is fixed to the pull wire part 22. By driving the pull wire part 22 to pull the pull wire 19, the pull wire 19 pulls the pin 15 inside.

[0042] Specifically, in this embodiment, the locking assembly further includes a clamping assembly for clamping or releasing the second connecting plate 24 by driving the two first connecting plates 23 to clamp or release. Preferably, in this embodiment, the clamping assembly is a cam handle 25. One end of the sliding part 13 is fixed to the corresponding first connecting plate 23, and the other end movably extends through the other first connecting plate 23. The cam handle 25 is pivotally connected to the end of the sliding part 13 that extends through the first connecting plate 23, and the pivot axis is perpendicular to the lateral extension direction of the sliding part 13. The cam handle 25 rotates around the pivot axis. The pivot has an unlocking part 26 and a locking part 27 that protrudes radially from the unlocking part 26; the cam handle 25 rotates so that the locking part 27 faces and presses against the outer side of the corresponding first connecting plate 23, causing the two first connecting plates 23 to move closer together, so that the second connecting plate 24 is clamped between the two first connecting plates 23, or so that the unlocking part 26 faces the outer side of the corresponding first connecting plate 23, so that the second connecting plate 24 is released between the two first connecting plates 23. The clamping assembly cooperates with the pin locking assembly 6 to achieve a more stable locking of the tractor frame 2's rotation.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A detachable wheelchair tow head and wheelchair lifting device, characterized in that: It includes a fixing frame (1), a tow head frame (2), a first connecting part (7), a second connecting part (8) and a locking assembly. The fixing frame (1) is used to fix it to the front of the wheelchair (3), and the tow head frame (2) is equipped with tow head wheels (5) at the bottom. The first connecting part (7) is fixed on the fixed frame (1), and the second connecting part (8) is fixed on the tractor frame (2), or the second connecting part (8) is fixed on the fixed frame (1), and the first connecting part (7) is fixed on the tractor frame (2). A shaft (9) is provided laterally on the first connecting part (7), and a fitting part (10) is provided on the second connecting part (8) for cooperating with the shaft (9) to rotate around the shaft (9). The fitting part (10) and the shaft (9) cooperate to pivotally connect the first connecting part (7) and the second connecting part (8) to swing and install the tractor frame (2) on the fixed frame (1) so that the front of the wheelchair (3) is supported when the tractor frame (2) swings and stands up, and the front of the wheelchair (3) is lowered when the tractor frame (2) swings and tilts. The locking assembly is disposed between the fixed frame (1) and the tractor frame (2) for locking and unlocking the relative displacement between the tractor frame (2) and the fixed frame (1); The mating part (10) is provided with a shaft slide outlet (11) on one radial side for the shaft (9) to slide in and out. The shaft (9) slides out of the shaft slide outlet (11) to remove the tractor frame (2) from the fixed frame (1). One of the first connecting part (7) and the second connecting part (8) is formed with a guide part (12), and the other is formed with a sliding part (13). When the shaft (9) is engaged with the mating part (10), the guide part (12) extends in an arc shape around the shaft (9). The sliding part (13) is used to limit the guide part (12) to slide along the extension path of the guide part (12). One end of the extension of the guide part (12) is provided with a sliding part slide outlet (14) for the sliding part (13) to slide in and out. The sliding part slide outlet (14) and the shaft slide outlet (11) face different directions. The locking assembly enables the tractor (2) to be locked at multiple different swing angles.

2. The detachable wheelchair tow head and wheelchair docking and lifting device as described in claim 1, characterized in that: The sliding part (13) extends laterally and penetrates the guide part (12). A first connecting plate (23) is provided at each end of the sliding part (13). The guide part (12) is provided on a second connecting plate (24). When the sliding part (13) is confined within the guide part (12), the second connecting plate (24) is inserted between the two first connecting plates (23). The locking assembly also includes a clamping assembly for driving the two first connecting plates (23) to clamp or release the second connecting plate (24).

3. The detachable wheelchair tow head and wheelchair docking and lifting device as described in claim 2, characterized in that: The clamping assembly is a cam handle (25). One end of the sliding part (13) is fixed on the first connecting plate (23) on the corresponding side, and the other end moves through another first connecting plate (23). The cam handle (25) is pivotally connected to one end of the sliding part (13) that extends through the first connecting plate (23), and the pivot axis is perpendicular to the lateral extension direction of the sliding part (13). The cam handle (25) has an unlocking part (26) and a locking part (27) that protrudes from the unlocking part (26) around its pivot axis. The cam handle (25) is rotated so that the locking part (27) faces and presses against the outside of the corresponding first connecting plate (23), so that the second connecting plate (24) is clamped between the two first connecting plates (23), or the unlocking part (26) faces the outside of the corresponding first connecting plate (23), so that the second connecting plate (24) is released between the two first connecting plates (23).

4. The detachable wheelchair tow head and wheelchair docking and lifting device as described in claim 1, characterized in that: The locking assembly includes a pin locking assembly (6), which includes a pin (15) and a pin seat (16). One of the first connecting part (7) and the second connecting part (8) is fixedly mounted on the pin seat (16), and the other is provided with a limit hole (17). The pin (15) is slidably disposed on the pin seat (16). As the tractor frame (2) rotates, the pin (15) deviates from or aligns with the limit hole (17). When the pin (15) aligns with the limit hole (17), the pin (15) is pushed outward to insert into the limit hole (17) to lock the rotation of the tractor frame (2). When the pin (15) is inserted into the limit hole (17), the pin (15) is pulled inward to exit the limit hole (17) to unlock the rotation of the tractor frame (2).

5. The detachable wheelchair tow head and wheelchair docking and lifting device as described in claim 4, characterized in that: The pin locking assembly (6) also includes an elastic element (18) and a pull wire (19). The elastic element (18) is disposed between the pin (15) and the pin seat (16) to push the pin (15) outward. One end of the pull wire (19) is connected to the tail of the pin (15) for pulling the pin (15) inward.

6. The detachable wheelchair tow head and wheelchair docking and lifting device as described in claim 5, characterized in that: The pin locking assembly (6) also includes a pull cable handle (20), which includes a handle fixing seat (21) and a pull cable part (22). The pull cable part (22) is movably disposed on the handle fixing seat (21) and connected to the pull cable (19).

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