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Safety device for motor-operated doors

  • US 6,218,940 B1
  • Filed: 09/04/1998
  • Issued: 04/17/2001
  • Est. Priority Date: 09/09/1997
  • Status: Expired due to Term
First Claim
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1. A safety device for externally-operated moving doors having a door leaf selectively moved in a guided fashion to close a door opening, said safety device including:

  • an optical beam protection assembly for monitoring a movement path of a leading edge of said door leaf, said optical beam protection assembly including a plurality of beam emitters for emitting a plurality of beams from one side of the door opening toward another side of the door opening in a direction generally transverse to said movement path; and

    a safety circuit for selectively at least one of stopping and reversing a closing movement of the door leaf upon sensing an obstacle in the movement path of the door leaf, wherein said beams of said protection assembly define a beam area that has at least one line, oriented in a door movement direction, in common with a movement area through which the leading door edge passes and wherein the safety device has a beam state control device that assigns one of a plurality of activation states to each of the beams as a function of the position and the movement of the door leaf.

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