Fire detecting system

Details Fire detecting system Fire detecting system

1979-06-07

1981-11-10

Heyman, John S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340517, 340595, G08B 1700, G08C 2300

Patent

active

043000991

ABSTRACT:
A fire detecting system which is capable of successively controlling the forecasting of a fire, setting off alarms and activating fire-extinguishing equipment. The system includes a detector adapted to produce an electric impedance corresponding to an amount of a fire generated object present, such as smoke density, light or heat. An amplifier element has a controlling electrode connected to the detector so as to amplify the change in the electric impedance transmitted by the detector. A voltage-differential actuated element is connected at its one input terminal to the connection terminal of the amplifier element. To the reference input terminal of this voltage-differential actuated element, connected is a reference operation voltage changing means which is controlled by a time constant circuit which is adapted to determine the duration or time length of the output from the voltage-differential actuated element. By so arranging the circuit, a discontinuous or continuous output is produced by the voltage-differential actuated element which is, materially under the control of the reference operation voltage changing means. Therefore, the pattern of the output from the voltage-differential actuated element obtained in accordance with the potentials changed by the reference operation voltage changing means and corresponding to the predetermined amounts of the detected object, provides the information concerning a fire around the detector. The multi-stage information from the detector is used for conducting the control of successive operations of the equipment or functions disposed around the detector such as, for example, the forecasting of a fire, setting off an alarm and activating fire-extinguishing equipments.

REFERENCES:
patent: 3995221 (1976-11-01), MacDonald
patent: 4052720 (1977-10-01), McGregor et al.
patent: 4157506 (1979-06-01), Spencer

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