Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-07-02
1981-08-11
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6167, 200 6193, 340542, G08B 1306
Patent
active
042837189
ABSTRACT:
A signalling device for use in combination with a door so as to signal when the door is attempted to be opened as by inward pivotal motion with respect to the frame in which such door is supported. Normally the alarm is an audible one such as a horn or siren, and in this manner, attempts to open the door are brought to the attention of those inside the structure. The device functions as a dead bolt lock and the signal aspect of the device may be overridden by a key-operated deactivation assembly. Generally the device operates by means of a transversely slidable bolt which may have electrical contact on the inner surface thereof for engagement with a contact on the inside of the door or housing attached thereto. Other contact locations are also contemplated. The bolt may be spring biased away from the door or housing contact and an appropriate electrical circuit is closed and the signal activated upon door movement as by attempted entry.
REFERENCES:
patent: 1012384 (1911-12-01), Lyon
patent: 2170521 (1939-08-01), Rodth
patent: 2287572 (1942-06-01), Rodth
patent: 2295482 (1942-09-01), Kemp
patent: 3530262 (1970-09-01), Hawkins
patent: 3587080 (1971-06-01), Hawkins
patent: 3755802 (1973-08-01), Bobrowski et al.
patent: 3810145 (1974-05-01), Gusaras
patent: 4029919 (1977-06-01), Lumme
patent: 4176347 (1979-11-01), McIntyre
Butler Edward A.
Savoie Francis R.
Caldwell Sr. John W.
Doherty Robert J.
Nowicki Joseph E.
Synco National Ltd.
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