Spray nozzle

Claim 1

A spray device comprising: a fluidic switch having a nozzle opening, and first and second guide walls extending from the opening in divergent relationship to guide the fluid after its discharge from said opening; the first guide wall being connected to the nozzle opening in such fashion that said wall functions as an attachment surface for the nozzle fluid; the second guide wall having an atmospheric port adjacent said opening, whereby said second guide wall is precluded from acting as a fluid attachment surface; and a vortex chamber located to receive fluid from the first and second guide walls; said first guide wall having a tangential connection with the vortex chamber to promote a swirling condition therein; said second guide wall having a connection with the swirl chamber whereby fluid flowing along said second wall tends to obstruct the swirling movement as the fluid flows into the chamber; said vortex chamber having an axially oriented port operable to discharge fluid from the chamber; said discharge port being sized to produce a back pressure in the vortex chamber when the chamber fluid is in a swirling condition, whereby the fluid floods the zone defined by the divergent guide walls, thereby producing a swirl-disrupting flow along the second guide wall; the flow area defined by the divergent guide walls being sufficient that continued flow thereacross rapidly restores the swirling condition in the vortex chamber, whereby the fluid output from the discharge port takes the form of an oscillating output of varying cone angle.