A cylindrical worm 25 is attached to an output shaft of a motor, a first worm wheel 26 and a second worm wheel 27 are disposed on both the sides of the axial center of the cylindrical worm 25, the first worm wheel 26 and a wire drum are supported by a first support shaft 28, and the second worm wheel...http://www.google.com/patents/US7003915?utm_source=gb-gplus-sharePatent US7003915 - Power device for vehicle sliding door
