To cope with emergency by quickly separating a door hooking tool by unlocking a support part from outside via clearance generated by opening a door by a key.
A door frame is arranged on the indoor side, a support part 1 for fixing a door chain 4 is a nonmagnetic substance such as aluminum, a fixing magnet 2 is enclosed to be seated on a shoulder part 1D so as not to fall off, and opening parts 1B, 1A are respectively formed in upper/lower parts. A joining part 3 composed of a magnetic substance of the door chain 4 is inserted into the opening part 1A, a door in a closed state of being fixed by the fixing magnet 2 exposed from the opening part 1A is opened by a key, and a releasing electromagnet 5 is inserted into the opening part 1B from outside via generated clearance to flow an electric current. The electromagnet 5 attracts the fixing magnet 2 by generating magnetic force, but at this time, the support part 1 is not magnetized, the fixing magnet 2 separates from the shoulder part 1D, rises in the support part 1, and stops by colliding with the releasing electromagnet 5 side. Thus, the joining part 3 separating from the rising fixing magnet 2 slips out of the support part 1, so that the door chain 4 also separates according to it. Thus, a door hooking tool can be quickly unlocked.
KIRITA KOSHU
AIDA RYUICHI
SAKURAI MASAAKI
NISHIMURA MITSUO
NAMITA MASATOSHI
SUNABA MAKOTO
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