Patent ID: 6976544

Claim:
A sprinkler comprising a temperature-activated means ( 1 ), a housing ( 2 ), an inlet ( 3 ) for a medium, a central nozzle ( 4 ), at least one side nozzle ( 5 a , 5 b ), a first channel ( 9 - 15 - 6 - 12 - 13 ) for guiding the medium from the inlet to the central nozzle while the sprinkler is in its active state, and a second channel ( 9 - 15 - 17 - 14 - 7 a ) for guiding the medium from the inlet to said at least one side nozzle ( 5 a ), the second channel being closed by means of a spindle means ( 8 ) while the sprinkler is in a standby state, which spindle means ( 8 ), in the sprinkler's standby state, is in a housing channel ( 14 ) of the housing in a first position, in which it is arranged to keep the second channel ( 9 - 15 - 17 - 14 - 7 a ) closed, and, which spindle means, when the sprinkler is being activated due to the temperture-activating means ( 1 ) reacting to heat, is arranged to move to a second position and to open the second channel, wherein the spindle means ( 8 ) comprises a first spindle part ( 8 a ) which, when it is in a first position, is arranged to keep the second channel ( 9 - 15 - 17 - 14 - 7 a ) closed while the sprinkler is in its standby state, which first spindle part comprises a first action surface area (A 1 ) that is exposed to pressure of the medium after the temperature-activated means ( 1 ) of the sprinkler is triggered and while the sprinkler is in its active state, and which first spindle part ( 8 a ), when the temperature-activated means of the sprinkler is triggered, is arranged to move against the spring-back force of a spring ( 10 ) from the first position to a second position in such a manner that it opens the second channel ( 9 - 15 - 17 - 14 - 7 a ) as a result of the medium directing to the first action surface area (A 1 ) at least a first pressure, and that the first spindle part ( 8 a ) comprises an additional surface area (A 2 ) that is exposed to said at least first pressure of the medium when the first spindle part ( 8 a ) moves from its first position to its second position, the size of the additional surface area being selected so that it, as a result of the pressure of the medium, keeps the first spindle part in said second position when the pressure of the medium is higher than a second pressure, which second pressure is substantially lower than the first pressure, whereby after the temperature-activated means is triggered, the sprinkler is in a first active state when the first spindle part is in its second position and in a second active state when the first spindle part is in its first position.