Intrusion alarm system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 1, 1980
Grant Date -
N/A
app pub date -
Jan 3, 1978
filing date -
Jan 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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