Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-10-18
1981-12-01
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340507, 340545, 340636, E05B 4510, G08B 1308
Patent
active
043039090
ABSTRACT:
A standard mechanical lock is provided with an electrical coding system for setting off an alarm in the event that an incorrect key is used or the lock is tampered with. The electrical coding system includes a binary code inscribed in the back edge of the key. A plurality of conductive fingers are mounted on the lock body to contact the back of the key when the key is rotated in the lock. A decoding circuit is provided which sounds an alarm in the event that an incorrect code is presented to the fingers. In the event that an attempt is made to pick the lock, one or more of the fingers will become grounded thus setting off the alarm. Automotive and building applications are disclosed wherein microswitch sensors are placed at strategic locations to set off the alarm in the event that an attempt is made to circumvent the mechanical lock.
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Jacobson Harvey B.
Martin James A.
Swann III Glen R.
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