Apparatus for forming pulse jets of liquid

Claim 1

Apparatus for forming pulsed jets of liquid comprising: an elongated cylindrical expulsion barrel having an inlet end, an outlet end and at least one longitudinal bore therethrough from the inlet end to the outlet end; an end cap having a forward face connected to said expulsion barrel inlet end, having a rear face, and having at least one radial bore therethrough communicating with said expulsion barrel longitudinal bore; bias means; a pressure cylinder encircling said expulsion barrel inlet end and said end cap and under urging of said bias means normally assuming a first position in which said pressure cylinder cooperates with said end cap to define a charge chamber extending behind said end cap rear face and around said end cap to a point intermediate said radial bore and said end cap rear face and capable of movement to a second position in which said charge chamber extends around said end cap to a point forward of said radial bore; said expulsion barrel and said end cap having an inlet opening therethrough communicating with said charge chamber; a check valve within the inlet opening for permitting charge flow through the inlet opening into the charge chamber while substantially preventing charge flow from the charge chamber through the inlet opening; and actuating means for actuating said pressure cylinder to move said pressure cylinder against the urging of said bias means toward said end cap, thereby applying pressure on charge material within the charge chamber until the pressure cylinder reaches the second position and charge is expelled out the expulsion barrel as a pulsed Liquid jet.