Sprinkler unit

Claim 1

A sprinkler unit comprising: a plastic body having: a downwardly projecting, threaded boss adapted to connect to a liquid supply system, a flange extending outwardly from the boss, a passageway through the boss, and an upstanding ring on the flange and surrounding the upper end of the passageway; a nozzle threaded into the upper end of the passageway such that the top of surface of the nozzle is below the top of the said upstanding ring, and the flange will keep vegetation from obstructing flow through the nozzle, said nozzle including: a central passage therethrough, a baffle plate in the bottom of said central passage, said baffle plate having angular slots therethrough whereby liquid passed through the slots is swirled within the central passage and is dischargeD from the upper end thereof and a central opening therethrough, an outwardly and upwardly flared wall at the upper end of the central passage, and a pin extending freely through the central opening in the baffle plate, said pin having a straight intermediate portion adapted to extend through the central opening, a bent portion at the lower end thereof to prevent passage of the pin upwardly through the central opening, and an angulated arm portion at the other end of the straight intermediate portion, said angulated arm portion extending to a location adjacent the outwardly and upwardly flared wall when the pin is in its uppermost position, whereby the bent portion engages the underside of the baffle, and terminating in a bent back portion that restrains the pin against movement downwardly out of the central opening and that is contacted by swirling liquid being discharged to pivot the pin.