Wire-sensored residential range hood fire extinguisher system

Details Wire-sensored residential range hood fire extinguisher system Wire-sensored residential range hood fire extinguisher system

1991-04-25

1993-02-16

Marmor, Charles A.

Fire extinguishers

Special applications

For cooking installation

169 61, 169DIG3, A62C 300

Patent

active

051862603

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.

REFERENCES:
patent: 2030468 (1936-02-01), Rahlmann
patent: 2585039 (1952-02-01), Rooke
patent: 3653443 (1972-04-01), Dockery
patent: 3824374 (1974-07-01), Mayher
patent: 3993138 (1976-11-01), Stevens et al.
patent: 4813487 (1989-03-01), Mikulec et al.
patent: 4830116 (1989-05-01), Walden et al.
patent: 4834188 (1989-05-01), Silverman
patent: 4895208 (1990-01-01), Alasio

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