Pass point system for controlling the operation of movable barriers

  • US 6,051,947 A
  • Filed: 03/12/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 03/12/1998
  • Status: Expired due to Term
First Claim
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1. An overhead door opener drive system comprising a housing, a motor supported on said housing, a pass point assembly 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 light emitter, at least one light receiver in communication with said controller, and an interrupter mechanism for selectively interrupting transmission of light to said at least one light receiver from said at least one light emitter to provide a 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;

    wherein said interrupter mechanism is driven by said motor in proximity thereto;

    said controller enabling setting and adjustment of said limits from a location remote from said pass point assembly.

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