Pump for dispensing liquid from a container in a generally conti

Details Pump for dispensing liquid from a container in a generally conti Pump for dispensing liquid from a container in a generally conti

1975-04-16

1976-07-06

Reeves, Robert B.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222341, 222384, 417534, 417544, G01F 1102

Patent

active

039677621

ABSTRACT:
A finger operable pump for dispensing liquid from a container in a generally continuous manner includes a pump housing having an inner pump body and an outer sealing element. The inner pump body has a liquid receiving chamber, divided into primary and secondary portions by a reciprocatable piston, and an inlet conduit to the primary chamber portion. The inner pump body further includes first and second lead passages that respectively communicate with the primary and secondary chamber portions. The outer surface of the inner pump body is recessed to form a channel interconnecting the first and second lead passages, and an air dome communicating with the channel that is designed to confine air as a pressure head above liquid flowing through the channel. The outer sealing element is shaped and sized to tightly nest about the inner pump body and seal the channel and the air dome. The piston is part of a plunger assembly which also comprises a hollow piston rod extending out of the pump housing and defining an outlet conduit that communicates from the secondary chamber portion to atmosphere.

REFERENCES:
patent: 2175947 (1939-10-01), Teeple
patent: 2301051 (1942-11-01), King
patent: 2567496 (1951-09-01), Pittenger
patent: 2772031 (1956-11-01), Roselund

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