| 摘要 |
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.
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