OBSTACLE DETECTOR FOR MOTORIZED SHUTTER AND MOTORIZED SHUTTER WITH OBSTACLE DETECTOR

摘要

[PROBLEMS] To provide an obstacle detector of an electric shutter exhibiting high sensitivity and high operation reliability and not permitting blow-through of flame from one side to the other side of the shutter upon occurrence of a fire, and to provide an electric shutter equipped with such an obstacle detector. [MEANS FOR SOLVING PROBLEMS] The obstacle detector comprises a flexible edge member (24) fixed to the bottom edge of a shutter curtain (12) and extending substantially over the entire length thereof. In the vicinity of one end of the edge member, a laser beam projector (34) projecting a laser beam in the longitudinal direction of the edge member through a hollow space (30) defined by the edge member is arranged, and a photosensor (40) for receiving that laser beam is arranged in the vicinity of the other end of the edge member. When the edge member is deformed elastically by external force and crushed, the laser beam is intercepted by the edge member and prevented from entering the photosensor. The edge member is made of a flame retardant elastomer material.