Land vehicles – Wheeled – Occupant propelled type
Patent
1991-12-27
1994-04-12
Focarino, Margaret A.
Land vehicles
Wheeled
Occupant propelled type
2803041, 280650, 280657, B62M 114
Patent
active
053019709
ABSTRACT:
A collapsible wheelchair conveniently switchable between deployed and stowage modes resists bending and torsional distortion. The wheelchair narrows for negotiating narrow airplane aisles, and it may be broken down or reassembled in the field without special tools. A rigid, generally cubicle, wheeled frame is foldable between deployed and retracted orientations. Drive wheels can be independently removed to narrow the wheelchair to clear restricted spaces. The frame supports a removable chair equipped with removable arm rests and an adjustable foot rest. The chair is mounted to a power pack centered between the opposite frame sides and mechanically interconnected by a pair of similar, spaced apart parallelogram linkages. The power pack comprises a pair of synchronized pneumatic cylinders coaxially disposed within separate tubular, extensible sleeves. Each parallelogram linkage comprises separate metallic links occupying a plane perpendicular to the frame sides for synchronizing side movement. Dynamic alignment and squareness are encouraged by a separate foldable brace system that comprises twin pairs of flat metallic links pivoted to the frame sides. The brace links occupy a plane that is parallel with and offset from the ground and generally perpendicular to the plane occupied by the parallelogram links. The brace links include critical locking orifices adapted to register with suitable locking pins projecting upwardly from a manually displaceable shelf when the frame is to be deployed. A foldable extension limiting system dynamically encourages frame squareness. Alignment of the frame is insured by the mutually orthogonal relationship of the moving parts.
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Boehl Anne
Carver Stephen D.
Focarino Margaret A.
Mahurin J. L.
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