Patent ID: 7717361

Claim:
A water distribution plate and diffuser plate assembly for distributing a stream emitted from a sprinkler nozzle comprising: a shaft having one end attached to a sprinkler component and an opposite end supporting first and second plates in axially spaced relationship for rotation about said shaft independent of one another, said shaft mounted so as not to rotate during operation of the sprinkler; the first plate located adjacent the nozzle and formed with at least one water distribution groove shaped and arranged to divide a primary stream emitted from the nozzle into a plurality of secondary streams, and the second plate located downstream of the first plate and formed with at least one diffuser element arranged to be struck by at least some of the plurality of secondary streams exiting the first plate, and wherein speed of rotation of said first and second plates is braked, wherein said first plate is formed with a first internal chamber surrounding said shaft and said second plate is formed with a second internal chamber surrounding said shaft, said first and second internal chambers containing viscous fluid.