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A Pelton type turbine is mounted in a riser of a pop-up sprinkler for rotation about a horizontal axis and drives a central bevel pinion gear through a gear train reduction. Upper and lower bevel gears supported on a vertical drive shaft are simultaneously driven in opposite directions by the centra

A Pelton type turbine is mounted in a riser of a pop-up sprinkler for rotation about a horizontal axis and drives a central bevel pinion gear through a gear train reduction. Upper and lower bevel gears supported on a vertical drive shaft are simultaneously driven in opposite directions by the central bevel pinion gear. A clutch slides up and down along the drive shaft to engage radially extending teeth formed on its upper and lower sides with complementary teeth formed on the upper and lower bevel gears. One end of a yoke is coupled to the clutch and the other end is moved vertically by an over-center mechanism to shift the direction of rotation of a nozzle turret connected to the upper end of the drive shaft. The over-center mechanism is tripped back and forth by a shift disc engaged by a pair of tabs of a turret coupling assembly.

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I claim: 1. A sprinkler, comprising: an outer housing having a lower end connectable to a source of pressurized water; a riser vertically reciprocable along a vertical axis within the outer housing between extended and retracted positions when the source of pressurized water is turned ON and OFF; a

I claim: 1. A sprinkler, comprising: an outer housing having a lower end connectable to a source of pressurized water; a riser vertically reciprocable along a vertical axis within the outer housing between extended and retracted positions when the source of pressurized water is turned ON and OFF; a nozzle mounted at an upper end of the riser for rotation about the vertical axis; a turbine mounted for rotation inside the riser; and a drive mechanism mounted within the riser and connecting the turbine to the nozzle so that when the source of pressurized water is turned ON the resulting rotation of the turbine by the pressurized water will rotate the nozzle, the drive mechanism including a reversing mechanism for causing the nozzle to rotate between a pair of arc limits, the reversing mechanism including a common rotatable driving member drivingly connected to the turbine through a gear train reduction, the driving member being capable of driving a pair of spaced apart driven members in opposite rotational directions, a sliding clutch positioned between the upper and lower driven members and reciprocable along a central drive shaft but rotatably coupled thereto, and a clutch moving member for reciprocating the clutch along the drive shaft to selectively positively engage the clutch with one or the other of the driven members. 2. The sprinkler of claim 1 and further comprising a mechanism that allows a least one of the arc limits to be adjusted. 3. The sprinkler of claim 1 and further comprising an over-center mechanism for shifting the reversing mechanism. 4. The sprinkler of claim 3 wherein the clutch reciprocating member is a yoke linked to the over-center mechanism. 5. The sprinkler of claim 1 wherein the clutch has radially extending teeth formed on upper and lower sides thereof that selectively engage with radially extending teeth on opposing sides of the driven members. 6. The sprinkler of claim 1 wherein the common rotatable driving member comprises a central bevel pinion gear. 7. The sprinkler of claim 6 wherein the driven members are each comprise a bevel gear that meshes with the central bevel pinion gear. 8. The sprinkler of claim 1 wherein the clutch is splined to the drive shaft. 9. The sprinkler of claim 1 wherein the nozzle is mounted in a turret and a turret coupling assembly connects an end of the drive shaft to the turret. 10. The sprinkler of claim 7 wherein the one of the upper and lower bevel gears that is not engaged by the clutch is free to rotate about the drive shaft in a direction opposite to a direction of rotation of the drive shaft. 11. A sprinkler, comprising: an outer housing having a lower end connectable to a source of pressurized water; a riser vertically reciprocable along a vertical axis within the outer housing between extended and retracted positions when the source of pressurized water is turned ON and OFF; a nozzle mounted at an upper end of the riser for rotation about the vertical axis; a turbine mounted for rotation inside the riser; and a drive mechanism mounted within the riser and connecting the turbine to the nozzle so that when the source of pressurized water is turned ON the resulting rotation of the turbine by the pressurized water will rotate the nozzle, the drive mechanism including a reversing mechanism for causing the nozzle to rotate between a pair of arc limits, the reversing mechanism including a central bevel pinion gear drivingly connected to the turbine through a gear train reduction, the central bevel pinion gear being capable of driving a pair of spaced apart upper and lower bevel gears in opposite rotational directions, a sliding clutch positioned between the upper and lower bevel gears and vertically reciprocable along a central drive shaft but rotatably coupled thereto, and means for vertically reciprocating the clutch along the drive shaft to selectively positively engage the clutch with one or the other of the upper and lower bevel gears. 12. The sprinkler of claim 11 and further comprising a mechanism that allows a least one of the arc limits to be adjusted. 13. The sprinkler of claim 11 and further comprising an over-center mechanism for shifting the reversing mechanism. 14. The sprinkler of claim 13 wherein the clutch reciprocating means includes a yoke vertically movable by the over-center mechanism. 15. The sprinkler of claim 11 wherein the clutch has radially extending teeth formed on upper and lower sides thereof that selectively engage with radially extending teeth on opposing sides of the upper and lower bevel gears. 16. The sprinkler of claim 11 wherein the turbine rotates about a horizontal axis and the gear train reduction includes a plurality of gears that rotate about a plurality of corresponding horizontal axes. 17. The sprinkler of claim 11 wherein the clutch is splined to the drive shaft. 18. The sprinkler of claim 11 wherein the nozzle is mounted in a turret and a turret coupling assembly connects an end of the drive shaft to the turret. 19. The sprinkler of claim 11 wherein the one of the upper and lower bevel gears that is not engaged by the clutch is free to rotate about the drive shaft in a direction opposite to a direction of rotation of the drive shaft. 20. A sprinkler, comprising: an outer housing having a lower end connectable to a source of pressurized water; a riser vertically reciprocable along a vertical axis within the outer housing between extended and retracted positions when the source of pressurized water is turned ON and OFF; a nozzle mounted in a turret positioned at an upper end of the riser for rotation about the vertical axis; a turbine mounted for rotation about a horizontal axis inside the riser; a drive mechanism mounted within the riser and connecting the turbine to the nozzle so that when the source of pressurized water is turned ON the resulting rotation of the turbine by the pressurized water will rotate the nozzle, the drive mechanism including a reversing mechanism for causing the nozzle to rotate between a pair of arc limits, the reversing mechanism including a central bevel pinion gear drivingly connected to the turbine through a gear train reduction, the gear train reduction including a plurality of gears that rotate about a plurality of corresponding horizontal axes, the central bevel pinion gear being capable of driving a pair of spaced apart upper and lower bevel gears in opposite rotational directions, a sliding clutch positioned between the upper and lower bevel gears and vertically reciprocable along a central drive shaft and splined to the drive shaft, and a yoke capable having a first end coupled to the clutch for vertically reciprocating the clutch along the drive shaft to selectively positively engage the clutch with one or the other of the upper and lower bevel gears, the clutch having radially extending teeth formed on upper and lower sides thereof that selectively engage with radially extending teeth on opposing sides of the upper and lower bevel gears, the one of the upper and lower bevel gears that is not engaged by the clutch being free to rotate about the drive shaft in a direction opposite to a direction of rotation of the drive shaft; a turret coupling assembly connecting an upper end of the drive shaft to the turret; an over-center mechanism connected to a second end of the yoke for shifting the reversing mechanism; and a mechanism that allows a least one of the arc limits to be adjusted.