Patent ID: 7389835
Filing Date: 2008-06-24
Classification: A61G,Y10S

Abstract:
1. A linkage arrangement for an active anti-tip system adapted for use in a powered wheelchair, the anti-tip system having at least one anti-tip wheel disposed on one side of a wheelchair pitch axis, the wheelchair having a drive-train assembly pivotally mounted to a main structural frame of the wheelchair and a suspension system for biasing the drive-train assembly and/or anti-tip wheel to a predetermined resting position, said drive-train assembly bi-directionally rotating about the pivot in response to torque applied to the wheelchair, the linkage arrangement comprising: a suspension arm pivotally mounted to the main structural frame about a suspension arm pivot and mounting the anti-tip wheel about a rotational axis, said anti-tip rotational axis being spatially located at a vertical position which is substantially equal to or above the vertical position of the suspension arm pivot; and at least two links operable to transfer bi-directional displacement of the drive-train assembly to said suspension arm.