Patent ID: 7090146

Claim:
An irrigation system for disturbing water to soil, the irrigation system comprising: a sprinkler comprising: an inlet coupling disposed to receive water from a source of pressurized water; a head comprising a cover having an outlet aperture, the head further comprising a plurality of flow control features, each of which is movable into fluid communication with the outlet aperture to control distribution of water received through the inlet coupling to the soil through the outlet aperture, wherein the cover comprises a substantially flat plate in which the outlet aperture is formed, wherein the head further comprises a flow control member comprising a plurality of tubular extensions, each of which is disposed to convey water to one of the flow control features, wherein the flow control member is rotatable about the generally vertical axis to align any of the tubular extensions with the outlet aperture; and a drive mechanism coupled to the cover to induce reversing rotation of the outlet aperture about a generally vertical axis through an angle of rotation, the drive mechanism comprising a reduction gear train that conveys torque from the rotor to the cover with a positive mechanical advantage, wherein the reduction gear train is exposed to the water received through the inlet coupling.