| 摘要 |
PROBLEM TO BE SOLVED: To provide a door closing device usable in place of a lock to prevent the intrusion of a suspicious person. SOLUTION: The door closing device for maintaining a vestibule door 20 mounted in an openable/closable manner to an opening of a vestibule frame 30 comprises a suction cup 11 provided on the vestibule frame 30 side to form a space between the edge part of the opening and the vestibule door 20 into a closed space 11d when the vestibule door 20 is in the closed position, and a hose 12 and a suction pump 14 for sucking air in the closed space 11d. The sucker 11 is formed of an elastic member to widen from a base part toward the tip part which abuts on a suction face. The hose 12 is provided with a valve 13 preventing back flow from the suction pump 14 side. COPYRIGHT: (C)2009,JPO&INPIT
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