Sprinkler head

A sprinkler head comprising a main body having a nozzle connected to a water supply piping system, in which an outlet of said nozzle is closed by a valve body, said valve body is pressed against said outlet of the nozzle by a set-screw from the opposite side of said nozzle, and said set-screw is threadingly engaged with a female screw in a saddle interposed between said valve body and a pair of levers whose one end are engaged with a step provided at a lower end of said main body, wherein said levers are fixedly clamped by and between said step and said saddle by threading of said set-screw into the saddle, and the other ends of said levers are engaged with a heat-sensitive decomposition structure comprising two sheets of metal plates connected together with a fusible alloy, said sprinkler head characterized in that said levers are provided with contact regions in their intermediate portions respectively which are capable of being held in contact with each other while said levers are engaged with the heat-sensitive decomposition structure and in that a space is formed in said intermediate portions of said levers along an axis of said female screw in said saddle.