G - Physics – 08 – B
Patent
G - Physics
08
B
84/1, 340/140.1
G08B 17/10 (2006.01) G08B 17/107 (2006.01) G10K 1/067 (2006.01)
Patent
CA 1063697
ABSTRACT A combination door chime and detector responsive to the particulate products of combustion passing through multiple passageways formed in the chime cover. The door chime includes conventional spaced tone bars each cooperating with a tuned resonator chamber. A tone bar striker mechanism capable of single-note, two-note, and sustained-repetitive note striking of the tone bars is disposed between the tone bars. A photo- electric particulate products of combustion detector is also disposed between the tone bars. The conventional low-voltage door and chime transformer serves as a power supply for both the combustion detector and the striker mechanism. The closing of a first remote door chime switch generates a single-note single; the closing of a second remote door chime switch gener- ates a two-note signal; and the detection of the particulate products of combustion generates a sustained-repetitive note which serves as an intense audible alarm. An optional voltage comparator and signal gate serves to generate a pulsing repeti- tive signal with a relative large time interval between suces- sive pulses. This fourth signal indicates a malfunctioning of the particulate products of combustion detector.
235458
Conville David J.
Crane Burke J.
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