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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 bevel pinion gear reversing mechanism through a gear train reduction. One end of a yoke is coupled to a clutch and the other end is moved vertically by an over-center mechanism through

A Pelton type turbine is mounted in a riser of a pop-up sprinkler for rotation about a horizontal axis and drives a bevel pinion gear reversing mechanism through a gear train reduction. One end of a yoke is coupled to a clutch and the other end is moved vertically by an over-center mechanism through a link arm to shift the direction of rotation of a nozzle turret connected to the upper end of a drive shaft. The over-center mechanism includes a pair of levers held together by a single coil spring with trunnions on a first lever pivoting in bearing surfaces of a second lever. An L-shaped actuating arm that extends from the second lever is tripped back and forth by a shift disc engaged by a pair of tabs of a turret coupling assembly.

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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 mount

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; anda 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 an over-center mechanism for shifting the reversing mechanism, the over-center mechanism including a first lever and a second lever held together by a coil spring, the first lever and the second lever being pivotable relative to each other to shift the reversing mechanism. 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 wherein the reversing mechanism includes a clutch and a yoke that is reciprocable to move the clutch between first and second positions for reversing a direction of rotation of the nozzle, and a link arm for connecting the clutch to one end of the first lever so that pivoting motion of the first lever will move the link arm to move the clutch between the first and second positions. 4. The sprinkler of claim 1 wherein a plurality of engaging portions of the first and second levers that engage each other, and a pair of spring attachment points are selected to ensure that the levers will positively rotate between two predetermined opposite end limit configurations without stalling at a third configuration intermediate the two end limit configurations. 5. The sprinkler of claim 4 wherein the first lever is formed with a pair of trunnions that engage corresponding bearing surfaces formed on the second levers. 6. The sprinider of claim 3 wherein the reversing mechanism further includes a link arm connecting the yoke and one of the first and second levers. 7. The sprinkler of claim 4 wherein the first lever is formed with a plurality of flat angled surfaces that engage a plurality of second flat surfaces of the second arm to define the two end limit configurations of the levers. 8. The sprinkler of claim 1 wherein the reversing mechanism includes a link arm coupled to one of the levers for linear movement. 9. The sprinider of claim 1 wherein the first and second levers are each made of a pair of spaced apart, parallel side pieces. 10. The sprinider of claim 1 wherein each lever has a post that extends between a pair of side pieces for holding a corresponding end of the spring. 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; anda 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 an over-center mechanism for shifting the reversing mechanism, the over-center mechanism including a first lever and a second lever held together by a coil spring having a first end connected to a first attachment point on the first lever and a second end connected to a second attachment point on the second lever, the first lever and the second lever being pivotable relative to each other to shift the reversing mechanism, and the first and second levers being configured, and the spring attachment points being located, so that the levers will be biased toward one or the other of two predetermined opposite end limit configurations without stalling at a third configuration intermediate the two end limit configurations. 12. 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 refracted 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; anda 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 an over-center mechanism for shifting the reversing mechanism, the over-center mechanism including a first lever and a second lever biased by a coil spring, the first lever and the second lever being pivotable relative to each other to shift the reversing mechanism. 13. The sprinkler of claim 12 and further comprising a mechanism that allows a least one of the arc limits to be adjusted. 14. The sprinkler of claim 12 wherein the reversing mechanism includes a clutch and a yoke that is reciprocable to move the clutch between first and second positions for reversing a direction of rotation of the nozzle, and a link arm for connecting the clutch to one end of the first lever so that pivoting motion of the first lever will move the link arm to move the clutch between the first and second positions. 15. The sprinkler of claim 12 wherein a plurality of engaging portions of the first and second levers that engage each other, and a pair of spring attachment points are selected to ensure that the levers will positively rotate between two predetermined opposite end limit configurations without stalling at a third configuration intermediate the two end limit configurations. 16. The sprinkler of claim 15 wherein the first lever is formed with a pair of trunnions that engage corresponding bearing surfaces formed on the second levers. 17. The sprinkler of claim 14 wherein the reversing mechanism further includes a link arm connecting the yoke and one of the first and second levers. 18. The sprinkler of claim 15 wherein the first lever is formed with a plurality of flat angled surfaces that engage a plurality of second flat surfaces of the second arm to define the two end limit configurations of the levers. 19. The sprinkler of claim 12 wherein the reversing mechanism includes a link arm coupled to one of the levers for linear movement. 20. The sprinkler of claim 12 wherein the first and second levers are each made of a pair of spaced apart, parallel side pieces. 21. The sprinkler of claim 12 wherein each lever has a post that extends between a pair of side pieces for holding a corresponding end of the coil spring.