Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-12-22
1995-04-11
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
70DIG49, 340427, G08B 1302, E05B 4506, B62H 520
Patent
active
054062578
ABSTRACT:
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.
REFERENCES:
patent: 4980667 (1990-12-01), Ames
patent: 5194845 (1993-03-01), Sirmon et al.
Kabushiki Kaisha Saikosha
Swann Glen
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