Land vehicles – Step or abutment ascending type vehicle – Relatively movable running gear portions
Patent
1985-11-13
1986-10-21
Pekar, John A.
Land vehicles
Step or abutment ascending type vehicle
Relatively movable running gear portions
180 82, 280 53, 280DIG10, A61G 502
Patent
active
046181555
ABSTRACT:
The invention is an apparatus or wheelchair of conventional doorway width capable of negotiating stairways, turning about landings as necessary. The chair includes an outer supporting assembly, preferably the normal transport wheels, and an inner supporting assembly or feet. The chair includes mechanisms for elevating the supporting assemblies, in turn, while the other assembly supports the weight of the chair. The elevating mechanism is connected to the chair seat such that, upon elevation of a supporting assembly, the chair elevates also. The elevated assembly is articulated and advanced on horizontal slide bearings into contact with the stairs, with supporting elements resting on both lower and upper stair treads. The chair and occupant are then advanced on horizontal slide bearings over the new supporting assembly. The elevating mechanism then transfers chair weight to the new supporting assembly and elevates the former supporting assembly. The operation is repeated, alternating between the supporting assemblies, until the stairs are climbed.
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