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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 couples the impeller and the nozzle. A clutch in the drive assembly includes a radially deformable collet that surrounds a drive shaft. A spring urges the col

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 couples the impeller and the nozzle. A clutch in the drive assembly includes a radially deformable collet that surrounds a drive shaft. A spring urges the collet against the drive shaft and provides a positive drive connection under a normal load and slips under an excessive load.

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We claim: 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 coupling the impeller and the nozzle; and a clutch in the drive assembly including a radially deformable collet surrounding a drive shaft that p

We claim: 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 coupling the impeller and the nozzle; and a clutch in the drive assembly including a radially deformable collet surrounding a drive shaft that provides a positive drive connection under a normal load and slips under an excessive load and wherein the collet includes a split ring that defines radially deformable fingers and a spring that urges the fingers of the collet against the drive shaft. 2. The sprinkler of claim 1 wherein the collet has internal teeth that engage external teeth on the drive shaft in non-slip fashion under the normal load and disengage and allow slippage under the excessive load. 3. The sprinkler of claim 1 wherein the collet is positioned internally of a spur gear. 4. The sprinkler of claim 1 wherein the collet is integrally formed as part of a spur gear. 5. The sprinkler of claim 3 wherein the spur gear is engaged with a final gear of a reduction gear train of the drive assembly. 6. The sprinkler of claim 1 wherein the shaft is coupled to a reversing mechanism of the drive assembly. 7. The sprinkler of claim 1 wherein the collet is integrally formed as part of a spur gear that is engaged with a final gear of a reduction gear train of the drive assembly and the shaft is coupled to a reversing mechanism of the drive assembly. 8. The sprinkler of claim 6 wherein the collet has internal teeth that engage external teeth on the drive shaft in non-slip fashion under the normal load and disengage and allow slippage under the excessive load. 9. 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 coupling the impeller and the nozzle; and a clutch in the drive assembly inside of a spur gear between an output gear of a reduction gear train in the drive assembly and a drive shaft connected to a reversing mechanism of the drive assembly that provides a positive drive connection under a normal load and for slips under an excessive load and wherein the clutch includes a radially deformable collet surrounding the drive shaft and a spring that urges the collet against the drive shaft. 10. The sprinkler of claim 9 wherein the collet includes a split ring. 11. The sprinkler of claim 9 wherein the collet has internal teeth that engage external teeth on the drive shaft in non-slip fashion under the normal load and disengage and allow slippage under the excessive load. 12. The sprinkler of claim 9 wherein the collet is integrally formed as part of the spur gear. 13. The sprinkler of claim 9 wherein the spring is a coil spring. 14. The sprinkler of claim 10 wherein the split ring has two gaps. 15. The sprinkler of claim 9 wherein the collet has a smooth outer surface. 16. A clutch, comprising: a radially deformable collet in the form of a split ring integrally formed inside a spur gear and dimensioned for surrounding a drive shaft with external teeth, a spring surrounding the collet for urging the collet against the drive shaft, the collet having internal teeth that engage the external teeth on the drive shaft in non-slip fashion under a normal load and disengage and allow slippage under an excessive load. 17. A sprinkler, comprising: a riser; a turbine mounted in the riser; a nozzle turret rotatably mounted at an upper end of the riser; a drive assembly coupling the turbine and the nozzle turret; and a clutch in the drive assembly including a radially deformable split ring surrounding a drive shaft, the split ring being integrally formed in the center of a spur gear, the split ring having internal teeth that engage external teeth on the shaft, and a spring that urges the split ring against the drive shaft to engage the internal and external teeth under a normal load and disengage the internal and external teeth under an excessive load and allow slippage. 18. 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 coupling the impeller and the nozzle; and a clutch in the drive assembly including a radially deformable collet surrounding a drive shaft and a spring that urges the collet against the drive shaft for providing a positive drive connection under a normal load and for slipping under an excessive load. 19. The sprinkler of claim 18 wherein the collet includes a split ring. 20. The sprinkler of claim 18 wherein the collet has internal teeth that engage external teeth on the drive shaft in non-slip fashion under the normal load and disengage and allow slippage under the excessive load. 21. The sprinkler of claim 18 wherein the collet is coupled to a spur gear. 22. The sprinkler of claim 18 wherein the collet is integrally formed as part of a spur gear. 23. The sprinkler of claim 21 wherein the spur gear is engaged with a final gear of a reduction gear train of the drive assembly. 24. The sprinkler of claim 18 wherein the shaft is coupled to a reversing mechanism of the drive assembly. 25. The sprinkler of claim 18 wherein the collet is integrally formed as part of a spur gear that is engaged with a final gear of a reduction gear train of the drive assembly and the shaft is coupled to a reversing mechanism of the drive assembly. 26. The sprinkler of claim 25 wherein the collet has internal rounded teeth that engage external rounded teeth on the drive shaft in non-slip fashion under the normal load and disengage and allow slippage under the excessive load. 27. The sprinkler of claim 26 wherein the collet includes a split ring.