초록 ▼

Selectively operable spiral cam wheels are positioned adjacent and rotate on a common axis with the drive wheels and are attachable to the drive wheels for progressively raising the wheelchair in response to rotation of the drive wheels in one direction and for progressively lowering the wheelchair

Selectively operable spiral cam wheels are positioned adjacent and rotate on a common axis with the drive wheels and are attachable to the drive wheels for progressively raising the wheelchair in response to rotation of the drive wheels in one direction and for progressively lowering the wheelchair in response to rotation of the drive wheels in the opposite direction. The spiral cam wheels are also attachable to the wheelchair frame so that the drive wheels are free to be rotated in the normal manner. A lifting arm is pivotally supported at one end on each side of the frame of the wheelchair and the other end is moved by the spiral cam wheels to progressively lift the casters of the wheelchair as the wheelchair is moved toward a curb to be traversed. Embodiments of the wheelchair are disclosed in which the wheelchair is raised as it is moved in a forward direction toward the curb, and in which the wheelchair is raised as it is moved in a rearward direction toward the curb.

대표청구항 ▼

A wheelchair adapted to traverse an obstruction such as a curb, said wheelchair including an occupant supporting seat, a frame supporting said seat, pairs of front and rear surface engaging wheels rotatably supported on said frame and supporting said seat for movement along a surface, one of said pa

A wheelchair adapted to traverse an obstruction such as a curb, said wheelchair including an occupant supporting seat, a frame supporting said seat, pairs of front and rear surface engaging wheels rotatably supported on said frame and supporting said seat for movement along a surface, one of said pairs of wheels being considerably larger than the other pair, normally inactive spiral cam means operatively associated with said larger wheels and rotatable about a common axis with said larger wheels for progressively raising said wheelchair up to the level of the obstruction in response to rotational movement of said larger wheels in one direction and for progressively lowering said wheelchair down from the obstruction in response to rotational movement of said larger wheels in the other direction, and control means operable by the occupant for selectively activating said normally inactive spiral cam means.