| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent door opening due to flashover by which unburned gas is ignited and explosively burn or supply air pressure. SOLUTION: A door 1, one side being rotatably supported on a wall 3, which is rotated by an auto hinge and closes a communicating passage at a time when a fire occurs is provided. A locking mechanism 13 is provided between the door 1 and a frame 1a. A spring 15 and an engagement pin 16 are arranged in order from the back in a hole formed on the door 1 side. The engagement pin 16 is connected with the bottom of the hole by a temperature fuse 18 breaking at a prescribed temperature. When the temperature fuse 18 is heated to a prescribed temperature slightly lower than the ignition temperature of unburned gas by a fire with the communicating passage 4 closed by the door 1, the temperature fuse 18 breaks, projecting the engagement pin 16, and the engagement pin 16 engages with the engagement hole of the frame 1a and locks the door 1, thus prohibiting it from opening.
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