Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1993-02-12
1994-10-11
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
169 61, 169 65, A62C 3500
Patent
active
053550269
ABSTRACT:
A range hood positioned above a cooking range employs a continuous heat sensor system which includes twisted wires which are separated from one another by an insulator which is formed of a material which melts at a predetermined temperature. The wires carry a supervisory current which also flows through an actuator, which may be an electrified system for cutting a tension wire. An indicator lamp, such as an LED, which may have a series resistor associated therewith, limits the current through the actuator to a level below the activation threshold of the actuator. Upon melting of the insulator, such as by the presence of a thermal hazard, a substantially short-circuit condition is produced which bypasses the current-controlling indicator LED, thereby applying an increased voltage across the actuator, as well as the current therethrough, to effect actuation of the actuator, whereby the actuator cuts the tension wire, permitting an actuation lever to be mover, and thereby causing a fire suppressant fluid to be discharged from a supply tank. Nozzles under the range hood direct the fire suppressant fluid, as desired.
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Gaffin Jeffrey A.
Pem All Fire Extinguisher Corporation
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