Abstract: The sprinkler head includes a nozzle head and a deflector plate held a certain distance apart. Firmly gripped between these two are a closure element which seals off the nozzle orifice and a trigger element (e.g. a liquid-filled glass vessel or a fusible soldered link) which disintegrates under the action of heat. When the trigger element disintegrates, the closure element is no longer held over the nozzle orifice but is forced away by the pressure of the water in the supply line. A spring element acting on the closure element guides it to one side clear of the jet of water now emerging through the nozzle orifice. The closure element cannot therefore become lodged in the sprinkler head to obstruct the water jet and thus impair the water distributing function of the sprinkler head.