Leakproof pump for hand-held dispensers

Details Leakproof pump for hand-held dispensers Leakproof pump for hand-held dispensers

1978-01-24

1979-05-22

Spar, Robert J.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222385, G01F 1100

Patent

active

041554892

ABSTRACT:
A leakproof pump construction for hand-held dispensers, comprising a pump cylinder, an annular piston having a hollow bore which is slightly conical, said piston being reciprocatible in the cylinder between high and low positions therein, and a hollow ducted plunger carrying the piston and extending through the bore thereof. The plunger has a side orifice and discharge passage or duct through which liquid product can flow to be dispensed from a spray head. The piston is movable between high and low positions on the plunger to control the discharge through the latter. For the non-dispensing condition, the piston seals against an internal shoulder in the cylinder while a valve head at the lower portion of the plunger seals against and effects a slight deformation of a cooperable valve seat on the lower body portion of the piston, so as to provide an improved seal between the latter two parts. During discharge, the valve head first leaves the piston valve seat after which the plunger and piston move together as a unit. Liquid from the cylinder is forced past the piston seat and into the side orifice of the plunger to be discharged through the hollow portion thereof. As a result of the improved seal between the plunger valve head and the piston valve seat, undesirable leakage of the pump is greatly minimized.

REFERENCES:
patent: 3060965 (1962-10-01), Taggart
patent: 3454198 (1969-07-01), Flynn
patent: 4010874 (1977-03-01), Steiman
patent: 4087025 (1978-05-01), Steiman

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