Patent ID: 7784521
Filing Date: 2010-08-31
Classification: E05D,E05Y,E06B

Abstract:
1. A door assembly comprising a door movably mounted on a track assembly, a counterbalance system connected to said door and having at least one spring, a tool adapter proximate at least one end of said counterbalance system, a detachable winding assembly adapted to selectively engage and selectively rotate said tool adapter to adjust tensioning of said spring, and a locking assembly interacting with said counterbalance system to maintain a selected tensioning of said counterbalance system upon detaching said winding assembly from said tool adapter, wherein said winding assembly includes a rotatable housing, a first gear rotatably mounted within said housing having a first axis of rotation positionable coaxial with said tool adapter, said first gear defining a receiver adapted to rotatably fix said first gear to said tool adapter, a second gear operatively interconnected with said first gear to cause rotation thereof, said second gear being rotatably mounted in said housing with a second axis of rotation substantially perpendicular to said first axis of rotation, a boss adapted to receive a driver extending outwardly from said second gear, the door system further comprising a counter assembly having a fixed gear attached to an outer surface of said housing around an opening, a counter cam coupled to said first gear to rotate in unison with said counter cam, and a rotating gear rotatably mounted on said housing and operatively interrelated with said fixed gear, wherein said counter cam has an eccentric profile and engages said rotating gear to rotate said rotating gear a selected circumferential distance for each revolution of said counter cam.