Wheelchair two-speed wheel assembly and quick-release mounting

Details Wheelchair two-speed wheel assembly and quick-release mounting Wheelchair two-speed wheel assembly and quick-release mounting

B - Operations, Transporting

62

M

B62M 1/14 (2006.01) A61G 5/02 (2006.01) F16H 3/70 (2006.01) A61G 5/10 (2006.01)

Patent

CA 2466259

A wheel assembly for a wheelchair having a two-gear arrangement, in which a hypocycloidal gear provides a ratio lower than 1:1. A shift member (38), located on the wheel assembly, has hand operated shift portions (70, 72) and is capable of moving perpendicular to the wheel axle between two positions. The shift member can be moved while the user is seated in the wheelchair and the wheelchair is not moving. The wheel assembly includes a hand rim (14) connected to a housing (18) within which is a gear assembly (22). The gear assembly includes two spaced cage plates (86, 88) which are joined by fixed shafts (92A-92A) having unidirectional rollers (92, 92) positioned thereon around the periphery thereof. The rollers have an exterior surface portion which engages with the interior surface of the housing to readily permit movement in the forward direction, but to prevent movement in the rear direction, unless the hand rims are used to rotate the housing relative to the gear assembly. The cage plate has rubbing elements which interact with the interior surface of the housing to produce an additional braking force for downhill terrain.

Ensemble de roue à deux vitesses pour fauteuil roulant manuel pourvu de plusieurs éléments structurels, dans lequel un engrenage est un engrenage hypocycloïde, assure un rapport de démultiplication inférieur à 1:1. Un organe de changement de vitesses est disposé sur l'ensemble de roue; il comporte des parties de changement de vitesses actionnées à la main, ledit organe de changement de vitesses étant capable de se déplacer latéralement (perpendiculairement à l'axe) de la roue entre deux positions. L'organe de changement de vitesses peut être actionné par l'occupant du fauteuil roulant. L'ensemble de roue comprend un cercle de manoeuvre qui est relié à un carter à l'intérieur duquel se trouve l'ensemble d'engrenages. L'ensemble d'engrenage comprend deux plaques de cage espacées, reliées par des tiges fixes à la périphérie desquelles sont placés des cylindres unidirectionnels. Les rouleaux ont une partie de surface externe qui met en prise la surface interne du carter de manière à permettre le mouvement dans une direction avant mais empêche le mouvement en arrière, à moins que l'on se serve des cercles de manoeuvre par rapport à l'ensemble d'engrenages. La structure à plaques de cage possède des éléments de frottement qui interagissent avec la surface interne du boîtier de manière à créer une force de freinage supplémentaire pour un terrain en pente.

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