Browse Prior Art Database

Adjustable Height Wheelchair Features

IP.com Disclosure Number: IPCOM000043840D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 28K

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 by up to 600 mm by means of a manually operated hydraulic pump. The effort required to raise the seat is minimized by using a linear spring which stores energy when the seat is lowered and releases this energy when the seat is raised. Safety features include mechanisms for automatically lowering stability feet and applying a brake to the wheels when the seat is raised more than a predetermined distance. 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.

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Adjustable Height Wheelchair Features

In a manually propelled folding wheelchair for a disabled person, e.g., a paraplegic, the height of the seat may be raised by up to 600 mm by means of a manually operated hydraulic pump. The effort required to raise the seat is minimized by using a linear spring which stores energy when the seat is lowered and releases this energy when the seat is raised. Safety features include mechanisms for automatically lowering stability feet and applying a brake to the wheels when the seat is raised more than a predetermined distance. 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. This article discloses mechanical features of a folding wheelchair that is height adjustable by up to 600 mm. The figure illustrates the features schematically. The wheelchair has a frame 1 with large wheels 2 for manual propulsion and small jockey wheels 3 for balance. A seat 4 is supported on the vertical members of frame 1 and is arranged to slide up and down. The handle 5 of a manually operated hydraulic pump is attached to seat 4 to provide the energy to lift the seat via a flexible hose to a cylinder and piston. A linear spr...