Patent ID: 8783582

Claim:
An irrigation spray nozzle for discharging an arcuately adjustable spray pattern, the nozzle comprising: a base having a first end portion adapted for attachment to an irrigation device and a second end portion; a first helical surface fixed relative to the base; a second helical surface moveable relative to the base, the first and second helical surfaces cooperating to define an arcuate discharge opening adjustable in size to determine an arc of spray distribution upon relative rotation between the first and second helical surfaces, the second helical surface being biased into a plurality of preset positions relative to the first helical surface such that a greater force is required to rotate the second helical surface out of one of the plurality of preset positions as compared to the force required to rotate the second helical surface between adjacent ones of the preset positions; and a deflector to deflect water received from the arcuate discharge opening.