| 摘要 |
Multiple mode wheelchairs designed to temporarily ergonomically assume operative configurations of reduced width and/or increased elevation, include collapsible frames, removable wheels and adjustable height, reversible seats. Rigid, spaced apart frame sides are interconnected by user configurable linkages. Preferably the frame comprises a synchronized parallelogram linkage system for foldability. Quick-release axle assemblies mount the large drive wheels for facilitating tool-free wheel removal. A pair of selectively deployable auxiliary wheels permit maneuvering through narrow aircraft aisles when the large drive wheels are removed. The caster wheels also may be removed for storage and shipping. The seat comprises a removable back, removable armrests, and a removable footrest, and is mounted upon pressurized, pneumatic cylinders which telescopingly facilitate user height adjustments. Preferably the cylinders are coaxially associated with a sleeve system linked with the frame. The cylinder assembly forms a removable power pack for quick interchangeability. Preferably the seat is mounted by jaw clamps which permit the user to quickly attach or remove the seat without special tools. The clamps also facilitate reversal of the seat position where desired by the user to reorient the relative position of the large drive wheels. A convenient lever associated with the seat enables the user to activate the pneumatic elevation control cylinders. Other embodiments comprise a rigid, knock-down frame which can be disassembled and packed into a carrying case, and an outboard auxiliary wheel system.
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