Adjustable nozzle and method of operation

An adjustable nozzle, comprising:

• a nozzle body having an inlet section with an inlet opening, an outlet section with an outlet opening, the outlet section including a terminal segment having opposed planar, parallel top and bottom walls and first and second opposed planar side walls contiguous with the top and bottom walls, wherein the top and bottom walls are greater in length than the first and second side walls such that the outlet opening is oblong, and a fluid flow path extending from the inlet opening to the outlet opening such that fluid exits the outlet opening in a rectangular stream;
• first and second opposed spray adjustment arms attached to the outlet section and extendable into the fluid flow path, the spray adjustment arms each having a planar body terminating in an upstream cam tab and a downstream cam tab and having a rectilinear edge facing a center of the fluid flow path, the upstream cam tabs being received for pivotal movement of the first and second spray adjustment arms in first and second sockets formed in the first and second side walls, respectively;
• and
• an actuator ring rotatably mounted on an end of the nozzle body, the actuator ring having an elliptical groove concentric with a center of the fluid flow path that receives the downstream cam tabs attached to the spray adjustment arms such that rotation of the actuator ring relative to the end of the nozzle body pivots the spray adjustment arms toward and away from the center of the fluid flow path, thereby varying a width of the rectangular stream of fluid from the outlet opening.