Mid-wheel drive wheelchair with front wheel multiple bias...

Details Mid-wheel drive wheelchair with front wheel multiple bias... Mid-wheel drive wheelchair with front wheel multiple bias...

2000-06-29

2002-10-08

Johnson, Brian L. (Department: 3618)

Motor vehicles

Special wheel base

Five or more wheels

C280S250100, C280S755000, C280S304100, C180S907000, C180S209000, C180S009320

Reexamination Certificate

active

06460641

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a wheelchair having a main wheel such as a manual or powered mid-wheel drive wheel and also having at least one ground engaging front wheel containing a multiple biased suspension and anti-tip assembly.
BACKGROUND OF THE INVENTION
Heretofore, mid-wheel drive wheels have had a front anti-tip wheel located up off or above the ground such as in the wheelchair disclosed in U.S. Pat. No. 5,944,131. Alternatively, U.S. Pat. No. 5,435,404 to Garin discloses a ground engaging front wheel and a rear caster wheel preferably attached to a vertically pivotal swing arm.
SUMMARY OF INVENTION
A mid-wheel drive wheelchair (either manual or power) has at least one resiliently biased ground engaging front wheel having a multiple suspension assembly to improve tracking upon undulating or irregular surfaces as well as improved anti-tip stability. The front wheel is a caster wheel pivotally attached to an arm directly or indirectly connected to the wheelchair frame. The front wheel desirably contains a dual spring suspension system wherein a primary spring has a preset compression and wherein a secondary spring has an adjustable compression to accommodate a range of individual body weights and personal performance preferences with regard to anti-tipping of the wheelchair. The secondary spring can be adjustable so that the compression thereof can partially overlap, be sequential, or have separate range than the primary spring.


REFERENCES:
patent: 3682462 (1972-08-01), Papousek
patent: 3862751 (1975-01-01), Schwaller
patent: 4118020 (1978-10-01), Myers
patent: 4455031 (1984-06-01), Hosaka
patent: 4513832 (1985-04-01), Engman
patent: 4720223 (1988-01-01), Neights et al.
patent: 4862983 (1989-09-01), Kreft
patent: 4905972 (1990-03-01), Scowen
patent: 5435404 (1995-07-01), Garin, III
patent: 5482261 (1996-01-01), Ortega
patent: 5772237 (1998-06-01), Finch et al.
patent: 5848658 (1998-12-01), Pulver
patent: 5851019 (1998-12-01), Gill et al.
patent: 5855387 (1999-01-01), Gill et al.
patent: 5899475 (1999-05-01), Verhaeg et al.
patent: 5944131 (1999-08-01), Schaffner et al.
patent: 5964473 (1999-10-01), Degonda et al.
patent: 6041876 (2000-03-01), Pulver et al.
patent: 6070898 (2000-06-01), Dickie et al.
patent: 6079698 (2000-06-01), Patterson et al.
patent: 6079725 (2000-06-01), Lazaros

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