Patent ID: 7096996

Claim:
An elevator crane comprising, an elevator car having at least one power driven wheel with a tire for engaging a first side of a flat surface on a vertical rail attached to a structure, at least one moveable support arm having a vertical frame with a plurality of wheels, the wheels arrayed alone the vertical frame and alternating perpendicular to each other along the frame with wheels having axles parallel and perpendicular to the length of the arm, the wheels with a tire, the support arm extending from the elevator car for engaging a second side flat surface side of the vertical rail, opposite the first side, for releasably attaching the elevator car to the rail and providing opposing force on the wheels engaging the rail to secure the elevator car to the rail with enough force to allow the elevator car to be supported by the wheels and moved vertically by the force of the at least one power driven wheel with the tire engaging the rail, the perpendicular wheel engage the rail for lateral support on a perpendicular surface of the rail perpendicular to the first surface, a crane attached to the elevator car.