Alarm for card operated locks with local reset

Details Alarm for card operated locks with local reset Alarm for card operated locks with local reset

1998-03-02

1999-12-28

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

70 439, 340542, E05B 4506

Patent

active

060087269

ABSTRACT:
An alarm device for a lock which provides a security system which displays unauthorized tampering with the lock. The device senses unauthorized movement of one or several elements in the lock and causes an alarm signal which may only be terminated by resetting the device by authorized operation of the lock.

REFERENCES:
patent: 4438426 (1984-03-01), Adkins
patent: 4742327 (1988-05-01), Burgess et al.
patent: 5041814 (1991-08-01), Lin
patent: 5132667 (1992-07-01), Cranford
patent: 5311168 (1994-05-01), Pease, Jr. et al.
patent: 5577408 (1996-11-01), Roos

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