Sealing pump

Details Sealing pump Sealing pump

1988-10-11

1991-02-12

Huppert, Michael S.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222341, 222385, 222477, 222571, 239333, 417446, B65D 8854

Patent

active

049917471

ABSTRACT:
A reciprocating pump for dispensing liquids from a container comprises a hollow body in which is slidably fitted a hollow piston. A piston seat is located in the body and provides a segment sized for sealing fit inside the hollow piston, thereby minimizing possible leakage through the pump when it is transported with a liquid filled container. Upper and lower valves are provided in the piston and body respectively. The piston seat is adapted to interact with the upper valve member to hold it open during a portion of an upward stroke of the piston thereby drawing any undispensed liquid back into the pump.

REFERENCES:
patent: 1196584 (1916-08-01), Randolph
patent: 3128018 (1964-04-01), Corsette
patent: 3185354 (1965-05-01), Lipman
patent: 3187960 (1965-06-01), Gorman
patent: 3362344 (1968-01-01), Duda
patent: 4120619 (1978-10-01), Blackband
patent: 4147476 (1979-04-01), Warren
patent: 4286736 (1981-09-01), Corsette
patent: 4340158 (1982-07-01), Ford et al.
patent: 4344744 (1982-08-01), Schuster
patent: 4524888 (1985-06-01), Tada

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