| 摘要 |
PROBLEM TO BE SOLVED: To provide a double lock device having a master key and an auxiliary key capable of effectively preventing illegal unlocking. SOLUTION: This double lock device 1 is provided with a master lock 2 having a lock plate 5, an auxiliary lock 3 having a timer side cam 9 for regulating the movement of the lock plate 5 and a cylinder cam 10, and a spiral spring type timer 8 for driving the timer side cam 9 according to unlocking of the auxiliary lock 3, moving a part of the timer side cam 9 to a position for regulating the movement of the lock plate 5 after the lapse of a designated time to prevent the master lock 2 from being unlocked.
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