Intrusion alarm system

Details Intrusion alarm system Intrusion alarm system

1978-01-03

1980-04-01

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340545, 340549, 200 44, 200 6164, 200 6167, 70432, 70439, E05B 4506, E05B 4512, G08B 1308

Patent

active

041964225

ABSTRACT:
A lock mechanism is included within the outer knob of a latch assembly. Associated with the inner knob is an alarm apparatus that includes a battery, a sound generator and a transducer for delivering an audible signal. The different components of the alarm apparatus are located either in an escutcheon associated with the inner knob or within the body of the knob itself. In either case, the latch assembly includes switch contacts which close to operate the alarm apparatus upon a very slight twisting of the outer knob.

REFERENCES:
patent: 1160496 (1915-11-01), Casper
patent: 2874240 (1959-02-01), Ricks
patent: 3259707 (1966-07-01), Eickhoff
patent: 3487404 (1969-12-01), Midkiff
patent: 3676617 (1972-07-01), Miller
patent: 3693110 (1972-09-01), Briggs et al.
patent: 3828340 (1974-08-01), Bauer et al.
patent: 3866164 (1975-02-01), Peterson
patent: 3939315 (1976-02-01), Schlage

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