Pump dispenser with combined inlet and outlet ports

Details Pump dispenser with combined inlet and outlet ports Pump dispenser with combined inlet and outlet ports

1992-10-21

1994-02-08

Shaver, Kevin P.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222341, B05B 1102, B67D 542, G01F 1104, G01F 1138

Patent

active

052842762

ABSTRACT:
A pump dispenser has a body consisting of two hollow cylinders of dissimilar diameters, the diameters of the two cylinders defining an outer boundary of a pump chamber. A piston defines the inner boundary of the pump chamber. The piston also defines a slidable seal with both body diameters and is provided with an aperture which can function as an outlet port on a downstroke and an inlet port port on an upstroke. A stem cooperates with the piston to form a discharge path which can be opened or closed and also cooperates with the aperture to define the ports. The stem is biased to close the discharge port when the dispenser is in rest position.

REFERENCES:
patent: 3640470 (1972-02-01), Susuki et al.
patent: 4025046 (1977-05-01), Boris
patent: 4117957 (1978-10-01), Duffey
patent: 4155489 (1979-05-01), Steiman
patent: 4230242 (1980-10-01), Meshberg
patent: 4274560 (1981-06-01), Cater
patent: 4958752 (1990-09-01), Maerte et al.
patent: 5020696 (1991-06-01), Cater
patent: 5038965 (1991-08-01), Cater
patent: 5046644 (1991-09-01), Cater

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