Wheelchair suspension system

A - Human Necessities – 61 – G

Patent

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Details

A61G 5/10 (2006.01) B60G 9/00 (2006.01) B60G 9/02 (2006.01) B60G 11/22 (2006.01) B60G 11/24 (2006.01)

Patent

CA 2340915

A wheelchair suspension system comprises a suspension assembly disposed adjacent to each wheel of the wheelchair, and attached to and interconnecting the axle (13) of the wheels to the wheelchair frame. Each of the suspension assemblies includes a front bracket (16) and a rear bracket (17), wherein the front bracket (16) is attached to the wheelchair frame and the rear bracket (17) is attached to the axle (13). Top and bottom generally L-shaped arms (35) each are privotally attached to each of the brackets in a diametrically opposed fashion, and an elastomeric spring (19) is disposed between and interconnects the arms. When one or more of the wheels encounters a bump in a travel surface of the wheelchair, the arms move closer together to compress the spring. Conversely, when one or more of the wheels encounters a depression, the arms move farther apart to place tension on the spring. The pivoting parallel arrangement of arms and brackets enables displacement of the axle in a substantially vertical, relatively large distance when one or more of the wheels encounter an irregularity in the wheelchair travel surface, which in turn maintains stability and steering control of the wheelchair by keeping the wheels in contact with the travel surface.

L'invention concerne un système de suspension pour fauteuil roulant qui comprend un ensemble de suspension adjacent à chaque roue, fixé et relié à l'essieu (13) des roues du châssis du fauteuil roulant. Chaque ensemble de suspension comprend des supports avant (16) et arrière (17), le support avant (16) étant fixé au châssis du fauteuil roulant et le support arrière (17) étant fixé à l'essieu (13). Des poignées supérieure et inférieure (35) généralement en forme de L sont fixées de manière rotative à chaque support de manière diamétralement opposée et un ressort élastomère (19) est disposé entre les poignées et les relie. Lorsqu'une ou plusieurs roue(s) heurte(nt) une bosse sur la surface de trajectoire du fauteuil roulant, les poignées se rapprochent pour comprimer le ressort. En revanche, lorsque l'obstacle rencontré par les roues est une dépression, les poignées se séparent de manière à contraindre le ressort. L'agencement rotatif parallèle des poignées et des supports permet un déplacement essentiellement vertical et relativement large de l'essieu lorsqu'une ou plusieurs roue(s) se heurte(nt) à une irrégularité de la surface de trajectoire. Le contact des roues avec la surface de trajectoire permet de préserver la stabilité et le contrôle de la direction du fauteuil roulant.

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