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Door locking system having a sensor for controlling activating/deactivating of a locking device

  • US 5,321,963 A
  • Filed: 09/16/1992
  • Issued: 06/21/1994
  • Est. Priority Date: 10/18/1991
  • Status: Expired due to Fees
First Claim
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1. A method for controlling access to an area behind a door comprising the steps of:

  • providing a locking device having a locking bolt and a light-activated sensing means;

    determining by the light-activated sensing means whether light or no light is present;

    inputting an access control code to a control unit mounted outside of the door; and

    activating the locking bolt thereby controlling access to the area behind the door only in response to no light being sensed and a valid code input by a user.

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