Alarm apparatus

Details Alarm apparatus Alarm apparatus

1988-03-03

1989-12-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specified indicator structure

340501, 340529, 340587, G08B 1706, G08B 2500, G08B 2700

Patent

active

048870722

ABSTRACT:
An alarm apparatus includes a plurality of sensors connected in parallel with each other between sensor lines extending from a receiver and sounding devices connected between the sensor lines in correspondence to at least one of the sensors. The receiver includes a unit for changing a voltage supply condition of the sensor lines. A control circuit is provided to each audio device so as to selectively control the audio devices when the voltage supply condition is changed, so that a audio device corresponding to an activated sensor, or all of the audio devices, can be arbitrarily controlled to generate audio alarm signals.

REFERENCES:
patent: 4223303 (1980-09-01), Albinger, Jr.

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