Patent ID: 7219924
Filing Date: 2007-05-22
Classification: A61G,G06F,Y10S

Abstract:
1. A power wheelchair comprising: a frame; a pair of drive wheels, each wheel having an axis of rotation; motors for driving respective drive wheels; a pair of suspension arms, one on each side of the frame, each arm pivoted to the frame about a suspension axis rearward of the axes of rotation of the drive wheels, each of the drive wheels and its associated motor being mounted on a respective one of the suspension arms; at least one ground-engaging idler wheel connected to said frame in front of said drive wheels; and at least one anti-tip wheel mounted to one of said suspension arms, rearward of the respective drive wheel, the at least one anti-tip wheel being in contact with the ground in a normal operational state of the wheelchair and connected to one of the drive wheels, the connection between the anti-tip wheel and the drive wheel about the suspension axis causing said anti-tip wheel to move relative to said frame in response to and in an opposite direction from movement of said one drive wheel relative to said frame as a result of the torque created by the motor in rotating the drive wheel.