Patent ID: 6116472
Filing Date: 2000-09-12
Classification: B05B

Abstract:
A trigger actuated pump sprayer comprising, a pump body having an elongated first passageway and an intersecting elongated second passageway, said second passageway having an inlet opening at an upstream end and a discharge orifice at a downstream end through which liquid product is discharged upon pump operation, said first passageway having a discharge end in communication with said inlet opening and an intake end in communication with the interior of a container of the liquid product to be discharged, said first passageway having an open upstream end and having a tubular wall with a port interconnecting a pump cylinder with said discharge end and said intake end, an elongated combined inlet and discharge stationary valve unit within said first passageway, said valve unit being mounted within said pump body and comprising stem means having integral one-way inlet and discharge valves thereon, said valves being axially spaced apart to define an annular chamber therebetween, said valves being located on opposite sides of said pump cylinder port in sealing engagement with said tubular wall, and each of said valves comprising a frusto-conical skirt diverging from said stem means in a downstream direction, each of said skirts having an outer peripheral edge in said sealing engagement, said first passageway being sized for insertion without obstruction of said valve unit through said upstream end into said first passageway, a hollow pump piston mounted in said pump cylinder to therewith define a variable volume pump chamber, a piston return spring for spring biasing said piston outwardly of said pump cylinder, and a trigger actuator movably mounted on said body, said actuator engaging said outer end of said piston for pressure stroking said piston upon a manual squeeze of said actuator whereupon liquid product flows out of said pump chamber into said annular chamber via said port for forcing said inlet valve closed and for collapsing said discharge valve to open, a relaxation of the manual squeeze applied to said actuator effecting a suction stroke of said piston under the action of said spring creating a sub-atmospheric condition in said pump chamber and said annular chamber whereupon liquid product is drawn from the container into said pump chamber via said annular chamber and said port as said inlet valve is collapsed and said outlet valve is forced closed.