Patent ID: 7861948

Claim:
A sprinkler, comprising: a riser; a nozzle for ejecting a stream of water; and a drive mechanism mounted in the riser that allows the nozzle to be manually rotated out of position of a pre-set arc of coverage and automatically return to a normal operation when it is ejecting the stream of water, the drive mechanism including a reversing mechanism having a pivotable set of gears, a pair of arc tabs, the arc tabs formed with a gradual inclined ramp edge and a curved edge, a radially extending resilient flexible shift dog that is moved by the curved edge of the arc tabs to actuate the reversing mechanism to shift the direction of rotation of the nozzle, the outer edge of the shift dog being flexed in an axial direction, by the inclined ramp edge of the arc tabs, to allow the arc tabs to be forced past the shift dog; and at least one over-center spring separate from the shift dog for biasing the pivotable set of gears into one of two positions.