Patent ID: 6218940
Filing Date: 2001-04-17
Classification: E05F,E06B

Abstract:
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; anda 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.