Embodiments herein relate to a wheelchair gearshift arrangement (10), which comprises an axle tube (20) and a pair of wheel attachment adaptors (30) inserted into a respective end (21, 22) of the axle tube (20). The wheel attachment adaptors (30) further includes a respective axle sleeve (40) adapte
Embodiments herein relate to a wheelchair gearshift arrangement (10), which comprises an axle tube (20) and a pair of wheel attachment adaptors (30) inserted into a respective end (21, 22) of the axle tube (20). The wheel attachment adaptors (30) further includes a respective axle sleeve (40) adapted to receive and hold a respective wheel axle (51) of a respective complete wheelchair wheel (50). Each complete wheelchair wheel (50) having a respective wheel axle centric, axially translatable, gear change mechanism (52). One or more gear change actuators (80) are arranged within the axle tube (20) such that they are operative to selectively, upon user manipulation of an associated gear selector (60), axially translate the associated gear change mechanisms (52) of the respective complete wheelchair wheels (50). Such translation will affect a change of gear ratio between a push-rim (55) and wheel-rim (56) of each respective complete wheelchair wheel (50).
대표청구항▼
1. A wheelchair gearshift arrangement comprising: an axle tube; anda pair of wheel attachment adaptors inserted into respective ends of the axle tube, wherein the wheel attachment adaptors each include a respective axle sleeve adapted to receive and hold a respective wheel axle of a respective compl
1. A wheelchair gearshift arrangement comprising: an axle tube; anda pair of wheel attachment adaptors inserted into respective ends of the axle tube, wherein the wheel attachment adaptors each include a respective axle sleeve adapted to receive and hold a respective wheel axle of a respective complete wheelchair wheel, wherein each of the respective complete wheelchair wheels has (i) a respective wheel axle with a centric, axially translatable, gear change mechanism, (ii) a push-rim, and (iii) a wheel-rim;one or more gear change actuators arranged within the axle tube that are operative to selectively, upon manipulation of an associated gear selector, axially translate the gear change mechanism of each of the respective complete wheelchair wheels, wherein the axial translation of the gear change mechanism of each of the respective complete wheelchair wheels affects a change of gear ratio between the push-rim and the wheel-rim of each of the respective complete wheelchair wheels. 2. A wheelchair gearshift arrangement according to claim 1, wherein the respective axle sleeve of each of the wheel attachment adaptor comprises means for preventing rotation of the respective wheel axle held therein relative to the axle tube. 3. A wheelchair gearshift arrangement according to claim 2, wherein the means for preventing rotation comprises a rotation inhibited element that is rotation inhibited with respect to the axle tube and that has a non-circular axle sleeve section adapted to receive a complementary non-circular distal section of the respective wheel axle for inhibiting rotation thereof relative to the axle tube. 4. A wheel chair gearshift arrangement according to claim 3, wherein the rotation inhibited element is arranged to, upon insertion of the respective wheel axle into the respective axle sleeve, be displaced inside the axle tube against a returning spring from a first wheel axle rotation inhibiting position to a second wheel axle rotation permitting position, wherein the second wheel axle rotation position is outside the complementary non-circular distal section of the respective wheel axle such that the complementary non-circular distal section of the respective wheel axle is free to rotate relative to the axle tube until the complementary non-circular distal section of the respective wheel axle matches the non-circular axle sleeve section, wherein when the complementary non-circular distal section of the respective wheel axle matches the non-circular axle sleeve section the rotation inhibited element is arranged to be returned to the first wheel axle rotation inhibiting position by the returning spring for inhibiting rotation of the wheel axle relative to the axle tube. 5. A wheelchair gearshift arrangement according to claim 4, wherein the rotation inhibited element is displaceable along one or more guide elements which are connected to a circular axle sleeve element of the wheel attachment adaptors which is fixed to the axle tube. 6. A wheelchair gearshift arrangement according to claim 1, wherein the respective axle sleeve comprises a recess formed inside the respective axle sleeve for receiving a quick locking catch arranged at the respective wheel axle of the respective complete wheelchair wheel for inhibiting axial displacement of the respective wheel axle relative to the respective axle sleeve, and where release of the quick locking catch is arranged to be effected through axial displacement of the centric, axially translatable, gear change mechanism in a direction inwards of the respective axle sleeve. 7. A wheelchair gearshift arrangement according to claim 1, wherein a central axis of each of the respective axle sleeves is inclined relative to a central axis of the axle tube such that each of the respective complete wheelchair wheels attached to the respective axle sleeve are automatically provided with one or more of: appropriate camber and toe-in, toe-out angles when the axle tube is attached to a chassis of a wheelchair. 8. A wheelchair gearshift arrangement according to claim 1, wherein the axle tube is bent such that central axes of the respective axle sleeves are inclined relative to each other such that each of the respective complete wheelchair wheels attached to the respective axle sleeve are automatically provided with one or more of: appropriate camber and toe-in, toe-out angles when the axle tube is attached to a chassis of a wheelchair. 9. A wheelchair gearshift arrangement according to claim 1, wherein one of the one or more gear change actuators is arranged within the axle tube such that the one of the one or more gear change actuators is operative to selectively, upon manipulation of the associated gear selector, simultaneously axially translate the gear change mechanism of each of the respective complete wheelchair wheels to affect the change of gear ratio. 10. A wheelchair gearshift arrangement according to claim 1, wherein respective ones of the one or more gear change actuators are arranged within the axle tube adjacent corresponding ones of the wheel attachment adaptors such that the respective ones of the one or more gear change actuators are operative to selectively, upon manipulation of the associated gear selector, simultaneously axially translate the gear change mechanism of each of the respective complete wheelchair wheels to affect the change of gear ratio. 11. A wheelchair gearshift arrangement according to claim 1, wherein the one or more gear change actuators comprises a spring returned hydraulic cylinder piston arrangement. 12. A wheelchair gearshift arrangement according to claim 1, wherein the one or more gear change actuators comprises an electrical actuator. 13. A wheelchair gearshift arrangement according to claim 1, wherein the one or more gear change actuators comprises a pneumatic actuator. 14. A wheelchair comprising a wheelchair gearshift arrangement according to claim 1. 15. A wheelchair gearshift arrangement according to claim 1, wherein the one or more gear change actuators comprises one or more mechanical actuators that are arranged to transfer gear change movement from the associated gear selector via a mechanical transfer mechanism. 16. A wheelchair gearshift arrangement according to claim 15, wherein the mechanical transfer mechanism comprises a linkage. 17. A wheelchair gearshift arrangement according to claim 15, wherein the mechanical transfer mechanism comprises a wire arrangement.
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이 특허에 인용된 특허 (8)
Sörquist, Christofer, Gear shift bar at a wheel for a vehicle.
Jeffries Benjamin L. (Seattle WA) Hyman Barry (Bellevue WA) Shepherd Matthew A. (Seattle WA) Nguyen Steven (Seattle WA) Cleofe Jaures F. (Seattle WA) Kim Daehwan D. (Aiea HI), Shifting mechanism and quick release for multispeed wheelchair.
Kylstra, Bart; Jauvtis, Nathan Isaiah; Cook, Thomas Martin; Huff, Jeremy Winston; Kerrel, Sean, Wheelchair drive system with lever propulsion and a hub-contained transmission.
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