Land vehicles – Wheeled – Extensible
Patent
1994-11-08
1997-01-14
Johnson, Brian L.
Land vehicles
Wheeled
Extensible
280650, 2802501, B62B 710
Patent
active
055931731
ABSTRACT:
A vertical foldable wheelchair (10) having a pair of side frame assemblies (11, 11') each including frame members coupled together for selective movement of the side frame assemblies (11, 11') between a vertically extended deployed condition and a relatively vertically compact collapsed condition. The frame members are coupled together to provide a bi-stable, over-center, linkage assembly (13, 13') which is movable between and biased toward both of: (i) a first stable position on one side of a linkage assembly centerline when the side frame assemblies (11, 11') are in the deployed condition; and (ii) a second stable position on an opposite side of the centerline when the side frame assemblies (11, 11') are in the collapsed condition.
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Johnson Brian L.
Quickie Designs Inc.
LandOfFree
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