Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-02-02
1981-11-10
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250381, 331108D, 331113R, G08B 1710, H03K 3281
Patent
active
043001327
ABSTRACT:
A fire alarm having in a single unit a battery and a fire detecting section energized by the battery to detect abnormal environmental conditions such as heat and smoke to provide an output signal. A voltage decrement detecting section detects a voltage decrement of the battery to provide an output signal. A warning unit such as a buzzer is coupled to a switching circuit for operating the warning unit upon reception of the output signal from either the fire detecting section or the voltage decrement detecting section through an input terminal thereof. To reduce power consumption, the system uses a multivibrator having C-MOS IC, inverters. The output of the voltage decrement detecting section is connected to a control input terminal of the switching circuit and external connection terminals and the output of the fire detecting section are connected to the control input terminal of the switching circuit through diodes, adapted to prevent the influence of the output signal of the voltage decrement detecting section.
REFERENCES:
patent: 3512106 (1970-05-01), Rosenthal
patent: 3713128 (1973-01-01), Wong et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 4017852 (1977-04-01), Kabat
patent: 4037206 (1977-07-01), Dobrzanski et al.
patent: 4041479 (1977-08-01), Miyabe
patent: 4091363 (1978-05-01), Siegel et al.
patent: 4122360 (1978-10-01), Kawagai et al.
Arima Takeo
Furuyama Akira
Caldwell Sr. John W.
Hochiki Corporation
Myer Daniel
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