Automatic gas injection fire extinguisher

Details Automatic gas injection fire extinguisher Automatic gas injection fire extinguisher

1994-05-03

1996-09-17

Pike, Andrew C.

Fire extinguishers

Special applications

Condition responsive control

169 11, 169 26, A62C 3513

Patent

active

055559409

ABSTRACT:
In order to carry out a two-stage fire extinguishing operation consisting of a cooling fire extinguishing step and an oxygen deficiency fire extinguishing step using a fire extinguishing gas in a closed space, a plurality of fire extinguishers are each provided with a firing pin unit for breaking a seal member of a cylinder, a retainer for maintaining the firing pin unit in a non-operative state, and a retainer operating device for operating the retainer by an automatic operation. The retainer is fixed at its head portion by a bolt screwed to an upper surface portion of a fixing member, and the leg portions of the retainer are fitted in a recess formed in an upper portion of a shaft to a lower end portion of which the firing pin is fixed. The retainer operating unit consists of a tapering shaft member, which is adapted to be pressed by a spring of a shape memory metal expandable at a predetermined temperature, whereby the leg portions of the retainer are opened to operate the firing pin.

REFERENCES:
patent: 2479801 (1949-08-01), Woodworth
patent: 3889752 (1975-06-01), Dunn
patent: 3893514 (1975-07-01), Carhart et al.
patent: 4175677 (1979-11-01), Poeschl et al.
patent: 4377209 (1983-03-01), Golben
patent: 4848388 (1989-07-01), Waldbusser
patent: 4972910 (1990-11-01), Fujiki
patent: 5123490 (1992-06-01), Jenne

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