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Movable barrier operator having force and position learning capability

DC
  • US 6,111,374 A
  • Filed: 02/13/1998
  • Issued: 08/29/2000
  • Est. Priority Date: 06/06/1995
  • Status: Expired due to Term
First Claim
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1. A movable barrier operator comprising:

  • an electric motor;

    a transmission connected to the electric motor to be driven thereby and for connection to a movable barrier to be moved with respect to a barrier frame;

    means for detecting a quantitative indication of position of the movable barrier;

    means for comparing the quantitative indication of position of the movable barrier to a stored digital end of travel position and for providing a halt signal in response to the stored digital end of travel position having been exceeded;

    a controller for halting the electric motor in response to the halt signal;

    a barrier position signal generator for producing a barrier position signal indicative of the barrier moving past a location fixed with respect to the barrier frame, the barrier position signal generator comprising a beam emitter and a beam detector disposed to form a beam pathway and an opaque plate extending from the barrier and into the beam pathway when the barrier is at the fixed location, wherein the beam detector detects a break in the beam pathway from the opaque plate; and

    means for correcting the quantitative indication of position according to the barrier position signal.

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