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Security apparatus

  • US 5,790,015 A
  • Filed: 09/08/1995
  • Issued: 08/04/1998
  • Est. Priority Date: 09/14/1994
  • Status: Expired due to Fees
First Claim
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1. A security apparatus for automatically locking a door, comprising:

  • a door lock switch for generating a door-unlocked signal when the door changes from a locked state to an unlocked state;

    a sensor for detecting movement within a monitored area adjacent the door and for generating one of a first detection signal in response to detected movement within the monitored area, and a second detection signal in the absence of detected movement within the monitored area;

    a security controller for generating a door lock command signal when the sensor continuously generates the second detection signal for a predetermined time period following the generation of the door-unlocked signal by the door lock switch; and

    door lock/unlock means for locking the door in response to the door lock command signal.

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