Pumps – Expansible chamber type – Plural pumping chambers
Patent
1994-09-27
1996-06-25
Freay, Charles
Pumps
Expansible chamber type
Plural pumping chambers
417554, 417569, 92147, 3031164, F04B 2304, F04B 5312, F04B 5314
Patent
active
055294669
ABSTRACT:
A pumping device is provided for pumping fluid from an inlet to an outlet. The pump comprises a piston reciprocable between an inlet chamber and an outlet chamber, a first valve between the inlet and the inlet chamber and responsive to reciprocation of the piston in a first direction to communicate the inlet to the inlet chamber, and a second valve between the inlet chamber and the outlet chamber responsive to reciprocation of the piston in a second direction to communicate the inlet chamber to the outlet chamber, whereby fluid is received in the inlet chamber when the piston reciprocates in the first direction and pumped from the outlet chamber when the piston reciprocates in either direction. Also provided is a pump assembly for pumping fluid for an anti-lock braking system. The pump assembly is a dual action pump including two pistons which are stroked 90.degree. out of phase with respect to each other by a common drive member.
REFERENCES:
patent: 1478469 (1923-12-01), Carver
patent: 3340818 (1967-09-01), Schanzlin
patent: 3407746 (1968-10-01), Johnson
patent: 3912045 (1975-10-01), Morris
patent: 4715666 (1987-12-01), Farr
patent: 5199860 (1993-04-01), Stegmaier
Freay Charles
Kelsey-Hayes Company
McAndrews, Jr. Roland G.
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