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A sprinkler includes a riser, an impeller mounted in the riser, and a nozzle rotatably mounted at an upper end of the riser. A drive assembly including a reduction gear train couples the impeller and the nozzle. A friction clutch is located in the drive assembly between an output gear of the reducti

A sprinkler includes a riser, an impeller mounted in the riser, and a nozzle rotatably mounted at an upper end of the riser. A drive assembly including a reduction gear train couples the impeller and the nozzle. A friction clutch is located in the drive assembly between an output gear of the reduction gear train and an input gear of the reversing mechanism and provides a positive drive connection under a normal load and slips under an excessive load. An alternate embodiment utilizes the friction clutch in a rotor-type sprinkler in which the nozzle rotates continuously through a continuous 360 degree arc.

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1. A sprinkler, comprising: a riser;an impeller mounted in the riser;a nozzle rotatably mounted at an upper end of the riser;a drive assembly including a reduction gear train coupling the impeller and the nozzle; anda friction clutch in the drive assembly coupled to an output gear of the reduction g

1. A sprinkler, comprising: a riser;an impeller mounted in the riser;a nozzle rotatably mounted at an upper end of the riser;a drive assembly including a reduction gear train coupling the impeller and the nozzle; anda friction clutch in the drive assembly coupled to an output gear of the reduction gear train that provides a positive drive connection under a normal load and slips under an excessive load, the friction clutch including a clutch member surrounding an output shaft that rotates about an axis of rotation of the friction clutch and a spring that urges the clutch member against the output shaft. 2. The sprinkler of claim 1 and wherein the spring is a coil spring. 3. The sprinkler of claim 1 wherein the drive assembly further includes a reversing mechanism and the friction clutch is located between an output gear of the reduction gear train and an input gear of the reversing mechanism. 4. The sprinkler of claim 3 wherein the output shaft has an end coupled to the reversing mechanism. 5. The sprinkler of claim 1 wherein the clutch member has a first cylindrical portion that is surrounded by the spring and a second portion in the form of a spur gear that engages the output gear of the reduction gear train. 6. The sprinkler of claim 1 wherein the coil spring and output shaft extend within a sleeve connected to a partition that supports the reversing mechanism. 7. The sprinkler of claim 4 wherein the end of the output shaft is coupled to the input gear of the reversing mechanism. 8. The sprinkler of claim 1 wherein the mating surfaces of the clutch member and the output shaft are smooth. 9. The sprinkler of claim 1 wherein the clutch member and the lower end of the output shaft have a complementary tapered fit. 10. A sprinkler, comprising: a riser;an impeller mounted in the riser;a nozzle rotatably mounted at an upper end of the riser;a drive assembly including a reduction gear train and a reversing mechanism coupling the impeller and the nozzle; anda friction clutch in the drive assembly located between an output gear of the reduction gear train and an input gear of the reversing mechanism that provides a positive drive connection under a normal load and slips under an excessive load, the friction clutch including an output shaft, a clutch member that surrounds the output shaft and having a split upper cylindrical portion and a lower portion in the form of a spur gear that engages the output gear of the reduction gear train, and a coil spring that surrounds the split upper cylindrical portion for urging the split upper cylindrical portion of the clutch member against the output shaft.