Patent ID: 6414454
Filing Date: 2002-07-02
Classification: E05F,E05Y,G05B

Abstract:
An overhead door opener drive system comprising a housing, a motor supported on said housing, a pass point assembly carried on the housing for measuring overhead door displacements with respect to an intermediate reference point, and a controller for controlling and repeatably setting limits for such displacements within a predetermined range of motion to limit undesired variation of door displacement limits over time;said pass point assembly comprising at least one transmitter, at least one receiver in communication with said controller, and a sensor mechanism driven at least indirectly by said motor for selectively altering communication between said at least one receiver and said at least one transmitter to provide a reference point signal to the controller when the door passes said reference point and to provide information to the controller concerning overhead door displacements relative to said reference point; and said controller enabling setting and adjustment of said limits from a location remote from said pass point assembly.