Patent ID: 7234554

Claim:
A power wheelchair comprising: a frame; a pair of drive wheels, each wheel having an axis of rotation; two drive assemblies, each for driving a respective drive wheel; a pair of motor support brackets, each motor support bracket attached to a drive assembly, each motor support bracket being pivotally attached to the frame such that the bracket and drive assembly combination can pivot with respect to the frame, the drive assembly being attached to the motor support bracket such that the drive assembly extends upward and rearward from the bracket; a spring suspension assembly attached to the motor support bracket forward of the attachment of the drive assembly, the spring suspension assembly being attached to the frame; at least one ground-engaging idler wheel connected to the 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 drive assembly such that pivoting of the drive assembly produces movement of the anti-tip wheel toward or away from the ground.