Patent ID: 6938923

Claim:
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 the respective motor driving each drive wheel 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 positioned above ground in a normal resting state of the wheelchair and connected to one of the drive wheels, the connection between the anti-tip wheel and the drive wheel permitting the axis of rotation of said anti-tip wheel to move relative to said frame in response to and in an opposite direction from movement of the axis of rotation of said one drive wheel relative to said frame.