Land vehicles – Wheeled – Occupant propelled type
Reexamination Certificate
1999-03-05
2001-06-05
DePumpo, Daniel G. (Department: 3611)
Land vehicles
Wheeled
Occupant propelled type
C280S304100
Reexamination Certificate
active
06241268
ABSTRACT:
The present invention relates to an arrangement for a wheelchair drive ring that is separate from the wheel of the wheelchair and exhibits a drive-actuating surface facing in a direction outwards from the wheelchair wheel.
In order to obtain maximum grip with the hand on the drive ring, the form of the actuating surface of the drive ring and its supporting frame have been varied. GB 2,122,144 A shows a drive ring with pairs of convex drive-actuating surfaces with a straight interconnecting gripping surface between them. This form is not so good, however, because the hand does not find the correct grip and is exposed at all times to the risk of sliding off the drive ring. Furthermore, no protection is provided from the spokes on the wheel. U.S. Pat. No. 4,366,964 also shows a drive ring of a similar kind with the same disadvantages.
The drive ring in this case is also executed so that it is completely smooth or with a friction-increasing gripping material along its entire effective gripping surface. This presents disadvantages, in the sense that it is not easy to vary the desired gripping interaction or the appropriate braking surface without the risk of suffering burns.
The principal object of the present invention is thus, in the first instance, to solve the aforementioned problems by means of a wheelchair drive of the indicated kind.
The aforementioned object is achieved by means of an arrangement in accordance with the present invention, which is characterized essentially in that an upper concave drive-actuating surface of the drive ring, which can be attached separately to the rim of the wheelchair wheel, is transformed directly into a lower convex drive-actuating surface, in that the aforementioned lower convex drive-actuating surface is transformed into a circular gripping part on the underside of the outward-facing drive-actuating surface, in that the aforementioned upper concave drive-actuating surface and the gripping part are transformed jointly into a downward-angled finger guard extending in towards the centre of the wheel, and in that friction-increasing gripping material is provided only on the upper concave drive-actuating surface.
REFERENCES:
patent: 4366964 (1983-01-01), Farey et al.
patent: 4593929 (1987-08-01), Williams
patent: 4687218 (1987-08-01), Okamoto
patent: 4917395 (1990-04-01), Gabriele
patent: 5160156 (1992-11-01), Mendon
patent: 5927739 (1999-09-01), Evling
patent: 1105764 (1955-12-01), None
DePumpo Daniel G.
Orum & Roth
LandOfFree
Wheelchair friction drive ring does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wheelchair friction drive ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wheelchair friction drive ring will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2515160