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A reversible, adjustable arc sprinkler head comprising a sprinkler body incorporating a fixed nozzle; a spray plate mounted on one end of a support cage for rotation with the support cage in one or the other of two opposite directions about a first axis arranged coaxially with a stream emitted from

A reversible, adjustable arc sprinkler head comprising a sprinkler body incorporating a fixed nozzle; a spray plate mounted on one end of a support cage for rotation with the support cage in one or the other of two opposite directions about a first axis arranged coaxially with a stream emitted from the nozzle, and for back and forth tilting motion about a second axis perpendicular to the first axis, an opposite end of the support cage secured to a sleeve rotatably mounted in the sprinkler body, the spray plate having a pair of substantially parallel grooves for selectively receiving the stream, wherein the direction of rotation of the spray plate about the first axis is determined by the tilting motion of the spray plate about the second axis; and a shift lever formed with an aperture sized to receive the stream, the shift lever mounted at one end on the sleeve for rotation about a third axis parallel to the first axis, the shift lever enabled to shift the stream from one of the pair of grooves to the other of the pair of grooves to thereby reverse the direction of rotation of the spray plate.

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1. A reversible, adjustable arc sprinkler head comprising a sprinkler body incorporating a fixed nozzle; a spray plate mounted on one end of a support cage for rotation with said support cage in one or the other of two opposite directions about a first axis arranged coaxially with a stream emitted f

1. A reversible, adjustable arc sprinkler head comprising a sprinkler body incorporating a fixed nozzle; a spray plate mounted on one end of a support cage for rotation with said support cage in one or the other of two opposite directions about a first axis arranged coaxially with a stream emitted from the nozzle, and for back and forth tilting motion about a second axis perpendicular to said first axis, an opposite end of said support cage secured to a sleeve rotatably mounted in said sprinkler body, said spray plate having a pair of substantially parallel grooves for selectively receiving the stream, wherein the direction of rotation of said spray plate about said first axis is determined by the tilting motion of said spray plate about said second axis; and a shift lever formed with an aperture sized to receive said stream, said shift lever mounted at one end on said sleeve for rotation about a third axis parallel to said first axis, said shift lever enabled to shift the stream from one of said pair of grooves to the other of said pair of grooves to thereby reverse the direction of rotation of the spray plate. 2. The sprinkler head of claim 1 wherein said support cage includes a pair of stop surfaces for confining the tilting motion of the spray plate. 3. The sprinkler head of claim 2 wherein said support cage also includes a pair of opposed notches engageable by said shift lever, radially beyond said aperture. 4. The sprinkler head of claim 1 wherein said aperture in said shift lever is shaped to provide a venturi effect which centers the stream within the aperture. 5. The sprinkler head of claim 1 and further comprising a pair of upstanding stop posts arranged for engagement by a remote end of said shift lever, said shift lever normally rotating with said spray plate and said sleeve until said shift lever engages one of said stop posts, causing said shift lever to cease rotating about said first axis and commence rotating about said third axis. 6. The sprinkler head of claim 5 wherein, when said shift lever rotates about said third axis between said stop posts, the shift lever causes the stream to shift to the other of said pair of grooves which, in turn, causes said spray plate to tilt and reverse the direction of rotation thereof. 7. The sprinkler head of claim 1 wherein said pair of substantially parallel grooves are each comprised of a vertical inlet portion and a generally horizontal, radially outward outlet portion. 8. The sprinkler head of claim 1 wherein said aperture in said shift lever is flared at an inlet portion thereof, describing an angle of about 90° between two diametrically opposed surfaces thereof. 9. The sprinkler head of claim 6 wherein said sprinkler body comprises an outer housing, said rotatable sleeve located radially inward of said outer housing, and a fixed, hollow rotor stem that supports said fixed nozzle. 10. The sprinkler head of claim 9 wherein said sleeve comprises a stator housing, with space provided radially between said rotor stem and said stator housing, and further wherein said space is at least partially filled by a viscous fluid. 11. The sprinkler head of claim 10 wherein said space includes enlarged cavities at opposite ends of said rotor stem that also contain viscous fluid. 12. The sprinkler head of claim 9 wherein said stop posts are supported on respective rings rotatably mounted on said outer housing. 13. A reversible, adjustable arc sprinkler head comprising a sprinkler body having an outer housing, a rotatable stator housing supported within said outer housing, and a fixed, hollow rotor stem secured to said outer housing and located radially inward of said stator housing, said rotor stem supporting an axially arranged nozzle; a spray plate mounted in a cage for tilting motion relative to the cage about a horizontal axis; the cage and spray plate mounted at one end on said stator housing for rotation relative to said sprinkler body about one vertical axis, said spray pl ate having formed therein a pair of substantially parallel grooves adapted to be sequentially aligned with said nozzle for receiving a stream from said nozzle, wherein the direction of rotation of said spray plate about said first axis is determined by the tilting motion of said spray plate about said second axis;a shift lever extending substantially horizontally and mounted on said stator housing for confined pivotal rotation about another vertical axis, parallel to said one vertical axis, said shift lever having an inner portion with an aperture therein through which a stream emitted from said nozzle may pass; anda stop assembly mounted on said outer housing and including a first rotationally adjustable, annular ring provided with a first stop post, and a second rotationally adjustable, annular ring supported on said first annular ring for rotation relative to said first annular ring, said second annular ring having a second stop post adjustable relative to said first stop post; and wherein said shift lever is arranged to rotate with said stator housing, said cage and said spray plate about said one vertical axis between said first stop post and said second stop post, and to rotate about said another vertical axis after engagement with one of said first stop post and said second stop post. 14. The sprinkler head of claim 13 wherein said first and second stop posts are adjustable relative to each other. 15. The sprinkler head of claim 14 wherein each of said first and second annular rings includes a means for locking the first and second annular rings, respectively, in desired adjusted positions. 16. The sprinkler head of claim 13 including a viscous fluid between said stator housing and said rotor stem for retarding rotational speed of said stator housing and said spray plate. 17. The sprinkler head of claim 16 wherein enlarged cavities are provided at opposite ends of said rotor stem that also contain said viscous fluid.