Patent ID: 8602325

Claim:
A sprinkler, comprising: a rotary stream deflector with a plurality of stream forming flutes; a nozzle; means for supporting the rotary stream deflector for rotation about an axis relative to the nozzle; a cover configured for enclosing the rotary stream deflector; and a hydraulically actuated mechanism that supports the cover above the rotary stream deflector for reciprocation relative to the rotary stream deflector between a lower closed position and a raised open position, the hydraulically actuated mechanism including: a first flow path configured to direct water to raise the cover to the raised open position; and a second flow path configured to direct water to impinge upon the rotary stream deflector; wherein the first flow path and the second flow path diverge below the rotary stream deflector, and wherein the cover is sufficiently elevated in the raised open position to allow a plurality of streams of water from the second flow path to be fully ejected by the rotary stream deflector without impingement by the rotary stream deflector.