Liquid dispenser with means for automatically purging air theref

Details Liquid dispenser with means for automatically purging air theref Liquid dispenser with means for automatically purging air theref

1976-08-25

1978-04-04

Bell, Houston S.

Fluent material handling, with receiver or receiver coacting mea

Filling or refilling of dispensers

By operation of means causing or controlling dispensing

734256, 128218C, 222391, 417435, B65B 312

Patent

active

040821218

ABSTRACT:
A hand-held liquid dispenser of the type using a piston and piston cylinder for precise dispensing of desired volumes of liquid, including an improvement that automatically eliminates any air from the piston cylinder when an operator normally fills the piston cylinder with the desired liquid. A second piston of larger diameter than the first is disposed to draw fluid through the piston chamber at a much faster rate during a first short segment of an intake stroke than would the first piston, thereby to exhaust all dead air from the cylinder and fill it entirely with liquid.

REFERENCES:
patent: 3023936 (1962-03-01), Marsh et al.

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