G - Physics – 08 – B
Patent
G - Physics
08
B
340/199, 179/35
G08B 23/00 (2006.01) G08B 1/08 (2006.01)
Patent
CA 1136245
A timed audible alarm system of the type including a piezoelectric component for providing an audible signal and circuitry for driving the piezoelectric component at substantially its resonant frequency provides circuitry for continuously producing the audible signal during the existence of a first condition, circuitry for intermittently producing the audible signal for a predetermined period during the existence of a second condition and in response to initiation of a third condition, the circuitry for intermittently providing including a heat activated bimetallic switch for controlling the predetermined period and for terminating the inter- mittently produced audible signal thereafter, the switch being coupled to begin heating in response to initiation of the third condition, and a visual signal device coupled to the bimetallic switch for visually signalling initiation of the third condition for the predetermined period and independent of the existence of the second condition, wherein the improvement enables an alarm system to provide recognizably different modes of operation to indicate the existence of different conditions.
325967
Doyle George W.
Sweany Louis P.
Mallory (p. R.) & Co. Inc.
Swabey Ogilvy Renault
LandOfFree
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