Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1986-08-22
1987-10-27
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340508, 340509, 340521, 340692, 340693, 379 43, G08B 2900
Patent
active
047033126
ABSTRACT:
An emergency alarm system incorporating both signal generation and voice annunciation capabilities, for installation in a building or other structure. The system includes a standard fire alarm control panel and one or more loud speakers, each speaker having a series blocking capacitor. The panel has conventional supervisory circuitry and sensing/alarm terminals connected therewith, adapted to indicate an alarm condition when conditions warrant, as by signals received on multiple sensor lines that also communicate with the panel. A signal generator and amplifier are arranged to drive the speakers, under alarm conditions. There is provided a circuit-failure indicator including an electrical switch and an electro-responsive actuator device connected with the signal generator. The electro-responsive actuator device, when energized by the signal generator, maintains the switch in a closed-circuit condition. An electrically conducting loop circuit is connected with the sensing/alarm terminals of the fire alarm control panel, the loop circuit involving the two speaker lines and a d.c. conducting shunt. The electrical switch is connected in series in the loop circuit whereby failure of either the signal generator or amplifier results in the open-circuiting of the switch, thereby distrubing the continuity of the loop circuit. By the above arrangement, breakage of either speaker line of the loop circuit, or open-circuiting of the electrical switch will result in activation of the sensing device of the fire alarm control panel, through solely its two sensing/alarm terminals, in order to indicate the existence of a trouble condition.
REFERENCES:
patent: 3906491 (1975-09-01), Gosswiller et al.
patent: 4060803 (1977-11-01), Ashworth, Jr.
Audiosone, Inc.
Crosland Donnie L.
Lehmann H. Gibner
Lehmann K. Gibner
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