Patent ID: 7040553

Claim:
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.