DRIVE SYSTEM FOR GARAGE DOOR

摘要

A drive system is provided for a moveable barrier, such as a garage door, that limits unauthorized shifting thereof. The drive system includes a cable actuator for lowering the door. The cable actuator is tensioned with a biasing mechanism to minimize cable throw, and a stop assembly of the biasing mechanism limits travel of the garage door from the closed position by a predetermined amount that is sufficiently small so as to keep intruders out of the garage.