Foam producing pump with anti-drip feature

Details Foam producing pump with anti-drip feature Foam producing pump with anti-drip feature

2006-02-28

2006-02-28

Keasel, Eric (Department: 3754)

Dispensing

Plural sources, compartment, containers and/or spaced jacket

With discharge assistant for each source

C222S190000, C222S145200, C222S148000, C222S321900, C239S337000

Reexamination Certificate

active

07004356

ABSTRACT:
A pump including a pump body having a head assembly slidably received therein; a mixing chamber in communication with an air source and a liquid source; wherein the head assembly is movable relative to the pump body to define a pump stroke, wherein the head assembly urges air from the air supply and liquid from the liquid supply into the mixing chamber to form a foam during the pump stroke; wherein the mixing chamber opens externally of the pump body and wherein during a portion of the stroke less than a complete stroke, the mixing chamber receives fluid and air to form a foam and discharge the foam externally of the pump and wherein during the remainder of the stroke, a blowing charge from the air source is urged through the mixing chamber and externally of the pump to evacuate any residual foam in the pump.

REFERENCES:
patent: 5100029 (1992-03-01), Meshberg
patent: 5110052 (1992-05-01), Graf et al.
patent: 5147087 (1992-09-01), Fuchs
patent: 5265771 (1993-11-01), Meshberg
patent: 5348189 (1994-09-01), Cater
patent: 5445288 (1995-08-01), Banks
patent: 6053364 (2000-04-01), van der Heijden
patent: 6082586 (2000-07-01), Banks
patent: 6220483 (2001-04-01), van der Heijden
patent: 2002/0070238 (2002-06-01), Pritchett et al.

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