Rotary sprinklers

Claim 2

A rotary sprinkler including a sprinkler head mountable on a pipe to be rotatable about a vertical axis, the sprinkler head carrying a nozzle from which the water issues in the form of a jet along the nozzle axis, the sprinkler head further including a spring and an arm urged in one direction By the spring, the arm having a portion impinged by the jet to move the arm in the opposite direction, thereby to oscillate the arm and to rotate the sprinkler head and the nozzle about said vertical axis, characterized in that said oscillating arm is pivotably mounted on an axis parallel to but spaced laterally of the vertical plane of the nozzle axis such that the impingement of the water jet on the arm produces a vector force coaxial with said nozzle axis and, thereby, a rotary torque about said pivotal axis of the arm for oscillating the arm.

Claim 3

A rotary sprinkler including a sprinkler head mountable on a pipe to be rotatable about a vertical axis, the sprinkler head carrying a nozzle from which the water issues in the form of a jet along the nozzle axis, the nozzle axis being in the same vertical plane as the axis of rotation of the sprinkler head, the sprinkler head further including a spring and an arm urged in one direction by the spring, the arm having a portion impinged by the jet to move the arm in the opposite direction, thereby to oscillate the arm and to rotate the sprinkler head and the nozzle about said vertical axis, said oscillating arm being pivotably mounted on an axis parallel to but spaced laterally of the vertical plane of the nozzle axis, the impinged portion of the arm being coaxial with the nozzle axis, the impingement of the water jet on the arm producing a vector coaxial with the nozzle axis and, thereby, a rotary torque about pivotal axis of the arm for oscillating the arm.

Claim 4

A rotary sprinkler including a sprinkler head mountable on a pipe to be rotatable about a vertical axis, the sprinkler head carrying a nozzle from which the water issues in the form of a jet along the nozzle axis, the nozzle axis being in the same vertical plane as the axis of rotation of the sprinkler head, the sprinkler head further including a spring and an arm urged in one direction by the spring, the arm having a portion impinged by the jet to move the arm in the opposite direction, thereby to oscillate the arm and to rotate the sprinkler head and the nozzle about said vertical axis, said oscillating arm being pivotably mounted on an axis parallel to but spaced laterally of the vertical plane of the nozzle axis, the impinged portion of the arm being coaxial with the nozzle axis, the impingement of the water jet on the arm producing a vector coaxial with the nozzle axis and, thereby, a rotary torque about pivotal axis of the arm for oscillating the arm.

Claim 5

A sprinkler according to claim 1, wherein said impinged portion of the arm includes baffle means substantially blocking splash of the water laterally of nozzle axis.

Claim 6

A sprinkler according to claim 3, wherein said impinged portion of the arm is of U-section and is open at the top, the web of the U-section being inclined upwardly with respect to the nozzle axis so as to be impinged by the water jet, the sides of the U-section serving as said baffle means substantially blocking splash of the water laterally of the nozzle axis.

Claim 7

A sprinkler according to claim 3, wherein said impinged portion of the arm is of U-section and is open at the bottom, the web of the U-section being inclined downwardly with respect to the nozzle axis so as to be impinged by the water jet, the sides of the U-section serving as said baffle means substantially blocking splash of the water laterally of the nozzle axis.

Claim 8

A sprinkler according to claim 3, wherein the impinged portion of the arm is in the form of a sleeve, the water jet being directed therethrough and impinging on the inner surface thereof, the sides of the sleeve serving as said baffle means substantially blocking splash of the water laterally of the nozzle axis.

Claim 9

A sprinkler according to claim 6, wherein the inner surface of the sleeve is formed with internal spiral vanes which are impinged by the water jet.

Claim 10

A sprinkler according to claim 6, wherein said sleeve is of rectangular section and is twisted longitudinally thereof, the inner surface of the twisted sleeve being impinged by the water jet.

Claim 11

A sprinkler according to claim 1, wherein said oscillating arm carries a hammer at the end opposite to the jet-impinged portion thereof and substantially co-axial therewith, said hammer engaging an abutment of the sprinkler head during the oscillation of the arm to rotate the sprinkler head and nozzle.

Claim 12

A sprinkler according to claim 1, wherein said oscillating arm carries a hammer at the end opposite to the jet-impinged portion thereof and substantially at right angles thereto, said hammer engageing an abutment on the sprinkler head during the oscillation of the arm to rotate the sprinkler head and nozzle.