Title: Combination door chime and particulate products of combustion detector

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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 photoelectric 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 signal; the closing of a second remote door chime switch generates 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 repetitive signal with a relative large time interval between successive pulses. This fourth signal indicates a malfunctioning of the particulate products of combustion detector.


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