Patent ID: 7694990

Claim:
A manually powered anti-tip wheelchair, comprising: a frame, the frame providing structural support for a seat; a pair of drive wheels, each of the pair of drive wheels having an axis of rotation; at least one front wheel mounted to a portion of the frame; at least one anti-tip assembly, comprising: (i) a pivot arm, the pivot arm including a wheel; (ii) a drive wheel attachment point for attachment of at least one drive wheel to the anti-tip assembly; and (iii) a frame attachment point, separate from and located rearward of the drive wheel attachment point, adapted to rotatably mount the anti-tip assembly to the frame, the at least one drive wheel and the pivot arm thereby being mounted to the frame, wherein the at least one drive wheel and pivot arm wheel are both adapted to contact a ground surface when the wheelchair is in use, wherein the at least one drive wheel and pivot arm wheel each support a portion of the weight of the frame of the wheelchair when in contact with the ground surface, and wherein the frame may rotate relative to the anti-tip assembly while the at least one drive wheel and pivot arm wheel remain in contact with the ground surface; and a stop device mounted on one of the pivot arm or the frame, the stop device selectively contacting the other of the pivot arm or the frame to limit the movement of the frame and pivot arm relative to each other, the stop device positioned to permit the frame to tilt back into a predetermined stable tilted position with the at least one front wheel in a raised position in such a manner that a user may sit in the seat of the wheelchair with the at least one front wheel engaging the ground surface, tilt the frame back into the predetermined stable tilted position, and operate the wheelchair with the at least one front wheel in the raised position.