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Garage door operator safety apparatus

DC
  • US 5,684,372 A
  • Filed: 01/18/1996
  • Issued: 11/04/1997
  • Est. Priority Date: 04/09/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for opening and closing a garage door comprising:

  • a motor having a rotatable member for rotating in a first direction to open the garage door and in a second direction to close the garage door;

    motor control circuitry responsive to motor control commands for selectively connecting electrical power to said motor to cause rotation of said rotatable member thereby opening and closing said garage door;

    control means for selectively sending one of a plurality of motor control commands to said motor control circuitry, said motor control commands specifying one of rotation of said rotatable member in said first direction, rotation of said rotatable member in said second direction, and no rotation of said rotatable member;

    means for sensing the rotation of said rotatable member after the sending of at least a predetermined one of said motor control commands; and

    means for sending fault control signals to said motor control circuitry when the rotation of said rotatable member sensed by said sensing means is not in accordance with the rotation specified by said at least one predetermined motor control command.

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