Patent ID: 8181889

Claim:
A pop-up sprinkler being adjustable for the even irrigation of a land area of regular or irregular shape, said sprinkler comprising: a lower water inlet, a lower water inlet housing; an upper member within upper housing suspended on a vertical axis within said lower water inlet housing, being free to revolve around a vertical axis and revolvably supporting; at least one nozzle assembly having at least one water inlet and an outlet jet and being supported on a horizontal axis at least indirectly by said upper member within the said upper housing; means for variably tilting said at least one nozzle assembly in a horizontal axis in accordance with the changing angular position of said nozzle around the central vertical axis when water pressure is introduced into said lower water inlet housing; and means for imparting a vertical axis rotary movement to directly supporting said at least one nozzle assembly; and wherein said means for variably tilting said at least one nozzle assembly further comprises: at least one thin flat ring cam made of a flexible material, held stationary by a non-revolving component of said sprinkler; screw means for adjusting the height of any section of said flat ring cam; and a cam follower unit arranged for contact around a face of said flat ring cam, linkage elements being provided to connect said cam follower unit to said nozzle assembly and thereby to impart a tilting movement thereto.