Fire-responsive control device utilizing thyristors

Details Fire-responsive control device utilizing thyristors Fire-responsive control device utilizing thyristors

1977-08-08

1979-03-27

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307252J, 307252M, 328 1, 328 3, 328 6, 340628, 361160, G08B 1700

Patent

active

041468031

ABSTRACT:
In a thyristor fire-responsive control device including a fire detector which has a thyristor as output switching means, a control circuit is responsive to the detector. A controlled apparatus is responsive to the detector through the control circuit for fire preventing operation thereof. A oscillator is connected to periodically reset the thyristor of the detector. Delay means is connected to continue the energization of the controlled apparatus for a predetermined interval after each transient resetting of the thyristor so that said controlled apparatus can operate continuously only during an interval in which the detector persists in its detecting operation.

REFERENCES:
patent: 3286185 (1966-11-01), Gilbert
patent: 3299288 (1967-01-01), McDowell et al.

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