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Movable barrier operator

  • US 6,239,569 B1
  • Filed: 03/27/2000
  • Issued: 05/29/2001
  • Est. Priority Date: 09/28/1998
  • Status: Expired due to Fees
First Claim
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1. A movable barrier operator operable from alternating current comprising:

  • an electric motor;

    a transmission connected to the motor to be driven thereby and to the movable barrier to be moved;

    an electric circuit for detecting AC line voltage and frequency of the alternating current;

    a worklight;

    a first set of operational values for operating the worklight, when a first AC line frequency is detected;

    a second set of operational values for operating the worklight, when a second AC line frequency is detected; and

    a controller, responsive to the detected AC line frequency;

    for activating the corresponding operational set of values for operating the worklight.

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