| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus easily realizing an entrance door for entry with or without a key by using a locking/unlocking knob mounting hole in an existing entrance door of a common household. SOLUTION: The present invention is characterized by the following points. An existing locking/unlocking knob of a main entrance side is removed, a body fixing plate is mounted and it is fastened and fixed by a nut. An electronic key body 4 is attached to the body fixing plate by a bolt. By pressing a transmission switch 1 near one's hand or a transmission switch 2 attached to the key, a rotary shaft of the electronic key body is rotated to provide locking and unlocking of the existing entrance door. The entrance door can be locked and unlocked as in a conventional entrance door by the locking/unlocking key 3 or a locking/unlocking lever. COPYRIGHT: (C)2004,JPO
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