Lawn sprinklers for lawns

Claim 1

A lawn sprinkler having a body with an inlet for admitting water to an interior of said body, a rotor mounted to rotate about a vertical axis in the base of said body, a pinion disposed within said body above said rotor and rotatable with said rotor about the said vertical axis, a stationary horizontal ring gear on an internal wall of said body which is disposed above said pinion so that said vertical axis coincides with the central axis of symmetry of said ring gear, a beveled planet gear which meshes both with said ring gear and said pinion and which is at an angle of inclination to the horizontal, said planet gear having a central aperture, a hollow distribution shaft extending at said angle of inclination with respect to the vertical from a lower end at which said distribution shaft is coaxially attached to said planet gear and communicates by means of said central aperture in said planet gear with the interior of said body, and an upper end which projects upwardly from said body and has an outlet nozzle for the delivery of water, a carrier which is rotatably mounted about the vertical axis and which rotatably supports said distribution shaft for rotation of the latter about its inclined axis, the arrangement of the foregoing elements being such that water entering said inlet impinges upon and rotatably drives said rotor which in turn drives said planet gear to cause said distribution shaft to rotate about its own inclined axis with respect to said carrier and simultaneously to rotate about said vertical axis with said carrier as water passes from the interior of said body, through said central aperture in said planet gear, upwardly through said distribution shaft to emerge as an outlet jet or spray from said nozzle.