Rotary stream sprinkler with adjustable arc orifice plate

A sprinkler, comprising:

• a riser having an inlet end and an outlet end;
• a nozzle rotatably supported at the outlet end of the riser and having a plurality of circumferentially spaced, radially extending stream forming channels;
• a stationary orifice plate removably mounted adjacent to the outlet end of the riser having an aperture shaped to deliver water flowing through the riser into the stream forming channels in a manner that produces an arc shaped water distribution pattern;
• a manually rotatably adjustable orifice plate configured and mounted for increasing or decreasing an arc of coverage of the sprinkler, the adjustable orifice plate including an arc limiting stop with a surface that contacts a lower surface of the nozzle and has a first circumferential width of the arc limiting stop that is larger than a second circumferential width of the channels of the nozzle.

A sprinkler, comprising:

• a riser having an inlet end and an outlet end;
• a nozzle having a plurality of circumferentially spaced, radially extending stream forming channels;
• a drive assembly mounted in the riser having an output shaft rotatably supporting the nozzle at the at the outlet end of the riser;
• an impeller coupled to an input shaft of the drive assembly;
• an adjustable orifice plate mounted adjacent the outlet end of the riser having an aperture shaped to deliver water flowing through the riser into the stream forming channels in a manner that produces an arc of coverage that can increase of decrease the arc of a water distribution pattern;
• a stop connected to the orifice plate and having a first circumferential width that is greater than a second circumferential width of the channels in the nozzle, an upper surface of the stop contacting a bottom surface of the nozzle to maintain water within a predefined path;
• a plurality of inwardly movable first tabs extending upwardly from the adjustable orifice plate and having teeth configured to engage teeth in the riser to prevent rotation under normal operating conditions;
• and a stationary orifice plate having a plurality of second tabs that fit into recesses formed in corresponding recesses in an upper end of the riser to prevent rotation of the stationary orifice plate.

A sprinkler, comprising:

• a riser having an inlet end and an outlet end;
• a nozzle rotatably supported at the outlet end of the riser and having a plurality of circumferentially spaced, radially extending stream forming channels;
• a gear drive coupled for rotating the nozzle;
• a stationary arc plate having an upper surface adjacent a lower surface of the nozzle and including a first aperture that directs water into terminal ends of the stream forming channels;
• a rotatable manually adjustable orifice plate adjustable by rotation mounted in overlapping relationship with the stationary orifice plate and having a second aperture shaped and aligned with the first aperture so that manual rotation of the adjustable orifice plate increases or decreases an arc of an arc shaped water distribution pattern;
• a manually adjustable locking mechanism for releasably locking a rotational position of the adjustable orifice plate including at least one deflectable surface that engages with the riser to prevent rotation under normal operation and can be radially deflected by an operator to disengage the deflectable surface and permit the operator to rotate the adjustable orifice plate.