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Turning blocking device

  • US 6,170,194 B1
  • Filed: 06/15/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 11/16/1995
  • Status: Expired due to Term
First Claim
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1. A method of blocking passage of a user through a passageway comprising:

  • providing one and only one barrier arm which blocks a passageway;

    moving said barrier arm from a blocking position to an intermediate position to allow passage of a user;

    providing a light detection range beyond said blocking position with reference to the direction of travel of a user passing through a passageway;

    sensing the change in light caused by a user passing through said light detection range; and

    coupling said sensed change in light with an electrical signal to activate a drive motor to move said barrier arm from said intermediate position to a second blocking position.

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