초록 ▼

A dispensing pump of the type in which the discharge valve will open and will remain open only for such time as the pumping pressure is maintained above a predetermined minimum. The pump includes a unitary plunger unit of annular configuration, the inner-periphery of which cooperates with the pump p

A dispensing pump of the type in which the discharge valve will open and will remain open only for such time as the pumping pressure is maintained above a predetermined minimum. The pump includes a unitary plunger unit of annular configuration, the inner-periphery of which cooperates with the pump piston to provide the main pump chamber, while its outer periphery cooperates with a socketed plunger head in the manner of a piston, to provide therewith a variable volume pressure accumulation chamber and to function as a pressure actuated discharge valve and shipping seal as well as a vent seal.

대표청구항 ▼

A dispensing pump of the pressure accumulating type comprising a pump body and means for securing same in fluid tight communication with the opening of a container of flowable product to be dispensed; said body including an annular base and a piston affixed to and projecting upwardly therefrom; an a

A dispensing pump of the pressure accumulating type comprising a pump body and means for securing same in fluid tight communication with the opening of a container of flowable product to be dispensed; said body including an annular base and a piston affixed to and projecting upwardly therefrom; an annular plunger mounted for reciprocation on said piston to therewith define a variable volume pump chamber; a plunger spring for urging said plunger upwardly toward a fully raised position above the base; said piston and said base having a check valve controlled inlet passage therethrough for establishing communication between said pump chamber and a container of flowable product to be dispensed; a plunger head having a downwardly directed blind socket slidably disposed on said annular plunger and therewith defining a variable volume accumulation chamber between said annular plunger and the blind end of said socket, and communicating freely with the pump chamber; said plunger head being formed with a discharge passage extending therethrough from said socket to the atmosphere at a location to be opened and closed by relative movement between said plunger head and said plunger in the direction of said reciprocation; and means for arresting the upward movement of the plunger head at a predetermined position wherein said spring normally urges the said plunger fully into the said socket to function as a valve for closing said passage.