Pump sprayer nozzle for producing a solid spray pattern

A manually actuated pump sprayer comprising, a pump body having a fluid discharge passage and a probe, a nozzle cap on said probe, said cap having a discharge orifice and means comprising a spin chamber for imparting a spin at a given velocity to fluid to be discharged through said orifice in a predetermined spray pattern, said spin chamber means communicating with said orifice and with said fluid discharge passage, the improvement wherein:

• an end of said probe confronting said spin chamber has a generally cylindrical closed fluid flow dampening chamber therein in open communication and coaxial with said spin chamber, said dampening chamber being viscous fluid coupled with said spin chamber, and said dampening chamber having a non-smooth sidewall defined by at least one projection extending toward the axis of said dampening chamber, whereby fluid enters said chambers and spins about the central axis of said dampening chamber developing spin energy which drives the fluid out of the orifice forming a spray, the spin energy being dampened within the spin chamber due to the viscous fluid couple formed with the fluid in the dampening chamber where energy loss occurs as rotational flow of the fluid encounters said at least one projection for reducing the spin energy to effect a solid spray cone of fluid having a consistently round pattern with uniform particle dispersion exiting said orifice.