Sprinkler

Abstract

The invention relates to a sprinkler comprising a holder body ( ), at least one nozzle ( ), a heat-activated release means ( ) and a cover ( ) which in a protective position is arranged in front of said nozzle when the sprinkler is in an inactive mode, the sprinkler comprising means ( ) for providing a displacement of the cover from the protective position to a free position in which the cover keeps clear of the nozzle so that it can spray extinguishing medium when the sprinkler is in an active mode, the holder body comprising an inlet ( ) for incoming extinguishing medium. In order for the sprinkler to be usable in surroundings where it may be heavily exposed to dirt and impurities and in order for it not to start spraying extinguishing medium when being exposed to heat and with the cover ( ) is in a protective position, the cover ( ) is arranged, in the protective position, to protect the release means ( ) but, when displaced, it is arranged to expose the release means and place the sprinkler in a standby mode in which the release means is intact so as to be able to react to heat and achieve a release of the sprinkler and place it in the active mode, and the means for achieving the displacement of the cover ( ) comprises a device ( ) which is displaceable with respect to the holder body ( ) and which is arranged under fluid pressure to exert a force on a locking means ( ) in the cover ( ) to make the locking means open and consequently displace the cover to said free position.