Liquid dispensing pump

Details Liquid dispensing pump Liquid dispensing pump

1980-05-07

1983-02-01

Rolla, Joseph J.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222380, 222383, B05B 1100

Patent

active

043710972

ABSTRACT:
A liquid dispensing pump includes a one-piece piston capable of not only effecting a pumping operation but also an outlet valve opening and closing function upon limited relative axial movement. In one embodiment, the piston reciprocates and forms a valve seat for a container vent opening extending through a closure cap provided on the pump body, and in another embodiment, the pump cylinder reciprocates and forms a valve seat for opening and closing the container vent opening. The pump chamber defined by the cylinder has a valved inlet which may be formed by a sleeve depending from the piston and an upstanding conduit in the cylinder or may be formed by a ball check valve in the cylinder.

REFERENCES:
patent: 2362080 (1944-11-01), Martin
patent: 3239151 (1966-03-01), Boris
patent: 3282472 (1966-11-01), Roder
patent: 3378205 (1968-04-01), Barker
patent: 3908870 (1975-09-01), Nozawa et al.
patent: 3934763 (1976-01-01), Steiman
patent: 4025046 (1977-05-01), Boris
patent: 4061247 (1977-12-01), Meshberg
patent: 4117957 (1978-10-01), Duffey
patent: 4215804 (1980-08-01), Giuffredi

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