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Inclination Warning for Adjustable Height Wheelchair

IP.com Disclosure Number: IPCOM000043838D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Beasley, PH: AUTHOR

Abstract

In a manually propelled folding wheelchair for a disabled person, e.g., a paraplegic, the height of the seat may be raised manually by up to 600 mm by an occupant. A warning device alerts the user of an unsafe elevation. Operation of this warning device is inhibited until the seat has been raised a certain amount and occurs when mercury switches detect an unsafe inclination. Conventional manually propelled folding wheelchairs for a disabled person have no provision for height adjustment. At work, wheelchair users who have the use of their arms are at a disadvantage compared to able-bodied people because of their poor reach. A wheelchair with height adjustment would not only improve their quality of life but also improve their efficiency as employees.

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Inclination Warning for Adjustable Height Wheelchair

In a manually propelled folding wheelchair for a disabled person, e.g., a paraplegic, the height of the seat may be raised manually by up to 600 mm by an occupant. A warning device alerts the user of an unsafe elevation. Operation of this warning device is inhibited until the seat has been raised a certain amount and occurs when mercury switches detect an unsafe inclination. Conventional manually propelled folding wheelchairs for a disabled person have no provision for height adjustment. At work, wheelchair users who have the use of their arms are at a disadvantage compared to able-bodied people because of their poor reach. A wheelchair with height adjustment would not only improve their quality of life but also improve their efficiency as employees. The figure illustrates schematically an unsafe inclination detection and warning system. A wheelchair has a frame 1, large wheels 2 for manual propulsion and jockey wheels 3 for balance. A seat 4 is supported on the vertical members of frame 1 and is arranged to be raised and lowered by an occupant of the wheelchair. This article discloses a safety feature required because of the danger of elevation on a slope to warn an occupant who attempts to raise the seat when on an unsafe slope. A battery-powered circuit with a siren 5 is in series with two normally open switches 6 and 7. Switch 6 is closed when a mercury switch 8 detects an unsafe inclination. In normal move...