| 摘要 |
PROBLEM TO BE SOLVED: To constitute an abnormal time closing device with good operability for descending a shutter curtain by dead weight, receiving an abnormality detecting signal from a disaster preventive board in abnormality such as a fire, in a dead weight descent type shutter device. SOLUTION: The abnormal time closing device 10 is composed of a first attitude changing means 13 having a first solenoid and a first plunger 13b connected to the disaster preventive board, and a second attitude changing means 14 having a second solenoid and a second plunger 14b connected to an AC power source. The first and second plungers 13b and 14b are connected by using a connecting member 16. A dead weight descent is stopped when detecting an obstacle in a process of the dead weight descent of the shutter curtain 2, and the dead weight descent is started when the obstacle is not detected. After detecting the obstacle in the process of the dead weight descent, the dead weight descent of the shutter curtain 2 is automatically resumed. COPYRIGHT: (C)2006,JPO&NCIPI
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