Double acting pump

Details Double acting pump Double acting pump

1990-09-26

1991-10-08

Huppert, Michael S.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222341, 239333, B65D 8854

Patent

active

050546597

ABSTRACT:
A double acting trigger pump on a container includes a cylinder and a piston reciprocal therein that cooperate in providing a primary pump chamber. An inlet valve regulates product being drawn into the primary pump chamber. A double piston seal is at the inner end of the piston and includes an outlet valve coaxial with a longitudinal bore in the piston. A supplemental pump chamber that also communicates with the bore is defined between outer surfaces of the piston and inner surfaces of the cylinder as well as the double piston seal and a rearward retaining ring. During the pressure stroke of the piston, product is dispensed from the primary pump chamber out from the pump and fills the supplemental pump chamber. During the suction stroke of the piston, product is drawn into the primary pump chamber from the container and product is discharged from the supplemental pump chamber out from the pump.

REFERENCES:
patent: 3531224 (1970-09-01), Clevenger et al.
patent: 3583605 (1971-06-01), Corsette
patent: 4591077 (1986-05-01), Corsette
patent: 4646969 (1987-03-01), Sorm et al.
patent: 4826052 (1989-05-01), Micallef

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