IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0820632
(2007-06-19)
|
등록번호 |
US-7735847
(2010-07-05)
|
발명자
/ 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
16 인용 특허 :
0 |
초록
▼
An all terrain adapter for a wheelchair that removably clamps onto the foot support of the wheelchair and supports a relatively large diameter, slightly inclined swivelling nose gear wheel at an extended distance from the foot support to stabilize the wheelchair when it is being pushed over soft or
An all terrain adapter for a wheelchair that removably clamps onto the foot support of the wheelchair and supports a relatively large diameter, slightly inclined swivelling nose gear wheel at an extended distance from the foot support to stabilize the wheelchair when it is being pushed over soft or uneven surfaces and which swivels around when the wheelchair is moved forward to lift the front wheels of the wheelchair clear of the ground.
대표청구항
▼
What is claimed is: 1. An all-terrain adapter for a wheelchair of the type having a seat frame, including a foot support, and large rear wheels and smaller front wheels mounted to the seat frame for allowing the wheelchair to be rolled over a surface, the adapter comprising: a strut for removable a
What is claimed is: 1. An all-terrain adapter for a wheelchair of the type having a seat frame, including a foot support, and large rear wheels and smaller front wheels mounted to the seat frame for allowing the wheelchair to be rolled over a surface, the adapter comprising: a strut for removable attachment at one end to the foot support; a single nose gear wheel having a diameter that is at least ten inches; a swivel mount for attaching the nose gear wheel to another end of the strut so that the nose gear wheel swivels about an axis that is slightly inclined from the vertical; attachment means for attaching and detaching the one end of the strut to the foot support; and wherein the front wheels of the wheelchair are lifted from the ground and remain suspended above the ground by the action of propelling the wheelchair in the forward direction to cause the nose gear wheel to swivel in a direction that shortens the wheelbase of the wheelchair between the nose gear wheel and the rear wheels. 2. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the attachment means includes a hand-operated clamp for clamping the one end of the strut to the foot support. 3. An all-terrain adapter for a wheelchair as recited in claim 2, wherein the hand-operated clamp, in clamping the one end of the strut to the foot support, forces the other end of the strut, on which the nose gear wheel is mounted, downward to bring the nose gear wheel in contact with the ground until the foot support and wheelchair are tilted backward, thereby relieving some of the weight of the wheelchair from the front wheels. 4. An all-terrain adapter for a wheelchair as recited in claim 1, further comprising a male coupling and a female coupling that attaches the strut to the attachment means. 5. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the wheelchair further includes a foot support having a pair of parallel, horizontal bars and the attachment means includes coupling members for engaging each of the bars and a clamp for clamping at least one of the bars onto one of the coupling members. 6. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the swivel mount includes wheel fork having a pair of canted legs that straddle and rotatably support the nose gear wheel and produce a horizontal trail and wherein the wheel fork rotates about the axis that is inclined from the vertical. 7. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the strut is generally “S” shaped. 8. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the attachment means pivots in a vertical plane between a stowed position, wherein the nose gear wheel is lifted from the ground, and an operative position, wherein the nose gear wheel is in contact with the ground and further including a locking mechanism for locking the attachment means in each of the stowed position and the operative position. 9. An all-terrain adapter for a wheelchair of the type having a frame, and large rear wheels and smaller front wheels mounted to the frame for allowing the wheelchair to be rolled over the ground, wherein the adapter comprises: a fixture clamped to the wheelchair frame; a strut extending at one end from the fixture toward the forward direction of travel of the wheelchair; a nose gear wheel assembly including a wheel having a diameter that is at least ten inches and a fork for straddling and rotatably mounting the wheel, the fork having a steering column and a pair of canted legs joined at one end to the steering column so that the wheel has a mechanical trail; a swivel mount for attaching the steering column to another end of the strut at a caster angle; and wherein the front wheels of the wheelchair are lifted from the ground and remain suspended above the ground by the action of propelling the wheelchair in the forward direction to cause the nose gear wheel to swivel in a direction that shortens the wheelbase of the wheelchair between the nose gear wheel and the rear wheels. 10. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the fixture includes a hand operated clamp. 11. An all-terrain adapter for a wheelchair as recited in claim 10, wherein the clamp is a vertical pull action latch clamp. 12. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the fixture further comprises a male coupling and a female coupling that attaches the strut to the fixture. 13. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the wheelchair frame includes a foot support having a pair of parallel, horizontal bars and the fixture includes coupling members for engaging each of the bars and a clamp for clamping at least one of the bars onto one of the coupling members. 14. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the strut is generally “S” shaped. 15. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the adapter pivots in a vertical plane between a stowed position, wherein the nose gear wheel is lifted from the ground, and an operative position, wherein the nose gear wheel is in contact with the ground and further including a locking mechanism for locking the adapter in each of the stowed position and the operative position. 16. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the swivel mount includes wheel support having at least one canted leg that rotatably supports the nose gear wheel and produces a horizontal trail and wherein the wheel support rotates about the axis that is inclined from the vertical, the top of this axis being inclined from the vertical toward the rear of the wheelchair. 17. An all-terrain adapter for a wheelchair as recited in claim 1, wherein the top of the axis about which nose gear wheel swivels is inclined from the vertical toward the rear of the wheelchair. 18. An all-terrain adapter for a wheelchair as recited in claim 9, wherein the caster angle is such that the steering column swivels about an axis the top of which is inclined from the vertical toward the rear of the wheelchair.
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