| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock device in which a key hole for unlocking a lock is made unnecessary while a place where the lock is installed cannot be recognized visually from the outside and an alarm device is operated when an intruder intends to grope and find the place of the lock. SOLUTION: The second dead bolt 10 operated by magnetic force and the alarm device 20 operated by magnetic force are installed at arbitrary places besides a lock with a latch bolt 5 operated by a door knob 4 and the dead bolt 7 operated by the lock 6.
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