| 摘要 |
PROBLEM TO BE SOLVED: To prevent a lock mechanism which has been operated during the occurrence of an earthquake from released while the earthquake is continuing, and also to make continuous a closed state of a door body. SOLUTION: A door body 1 is connected to the main body in an openable manner, and a seesaw body 7 rotatable with a support shaft 8 as a fulcrum is provided for the main body 2. This seesaw body 7 is normally not in a state of linking with a regulating piece 2 of the door body 1 by means of a movable body 10; at the occurrence of an earthquake, this seesaw body 7 rotates and links to a regulating piece 20, and the door body 1 is made non-openable. Also, on the rear surface of the seesaw body 7, a linking recessed portion 33, to which a spherical auxiliary movable body 32 is fittable, is provided; at the occurrence of an earthquake, the auxiliary movable body 32 moves freely through a long gutter 35 provided in the main body 1, which causes a collision of the rear surface of the seesaw body 7 to the auxiliary movable body 32, by which the return of the seesaw body 7 to the ordinary position of the seesaw body 7 is made difficult.
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