Gear drive sprinkler

摘要

An improved gear drive sprinkler has a pop-up spray head adapted for adjustable part-circle or full circle operation to deliver irrigation water over a selected terrain area. The sprinkler includes a pop-up riser having a rotatable spray head mounted at an upper end thereof. A gear drive transmission mounted within the riser includes a water-driven turbine for rotatably driving a speed reduction gear train which in turn rotatably drives the spray head. A reverse assembly includes an upper trip unit defining an individually adjustable pair of end trip stops, and a lower shift mechanism including a shiftable director plate having first and second sets of angularly oriented jet nozzles for respective alignment with turbine jet ports for respectively driving the water-driven turbine and the gear train in a forward-drive or a reverse-drive direction. The upper trip unit is coupled to the director plate by an elongated trip rod which shifts the director plate between forward-drive and reverse-drive positions in response to spray head rotation to a position corresponding with one of the end trip stops. An adjustment cam can be manipulated to disable at least one of the end trip stops to permit spray head rotation through continuous full circle revolutions. The upper trip unit additionally includes a spring-loaded clutch adapted to disengage in response to attempted forced rotation of the spray head, to prevent vandalism damage to reverse assembly components.