Delayed action alarm device for locks

摘要

An alarm device for locks detects an attempt to break the lock as vibration and generates an alarm. The alarm device is provided with a first timer having a first predetermined time period and a second timer having a second predetermined time period. The first predetermined time period is provided for preventing the vibration caused during locking from triggering the alarm. The second predetermined time period is provided for preventing the vibration caused during unlocking from triggering the alarm. The alarm device has its alarm action delayed according to the first and the second predetermined time periods for preventing a false alarm.