Patent ID: 7648320

Claim:
A self-propelled carriage on wheels for transferring a motor vehicle by lifting wheels of the vehicle, the carriage comprising: two parts that are joined together with a hinge, one of said two parts having four support wheels and another of said two parts having two support wheels, each of said two parts carrying the wheels of a respective axle of the vehicle being transferred; and each of said two parts comprising, a wheel lifting frame that moves vertically, a rotatable gear carried by said frame and engaging a pair of geared racks that move symmetrically and in opposite directions perpendicularly with respect to a longitudinal axis of the carriage, a pair of centering bars carried by said frame and that are parallel to the longitudinal axis of the carriage and that are each connected to a respective different one of said geared racks and that move in opposite directions perpendicular to the longitudinal axis of the carriage when impelled by said geared racks into engagement with interior sides of the wheels of the vehicle being transferred, and each of said centering bars having plural supports that extend parallel to said racks and that are arranged and adapted to engage a tread of a respective wheel of the vehicle being transferred, said centering bars and plural supports moving vertically with said frame to lift the vehicle.