Pumps – Expansible chamber type – Plural pumping chambers
Patent
1982-12-02
1984-06-12
Freeh, William L.
Pumps
Expansible chamber type
Plural pumping chambers
417426, F04B 3900, F04B 2702
Patent
active
044538987
ABSTRACT:
The invention is directed to a dual-piston reciprocating pump assembly which includes two opposed substantially identical reciprocating pumps, a housing within which the pumps are mounted, a cam mounted on a cam shaft which is driven through a coupling by a stepping motor, each of the pumps including a piston assembly comprising a piston body having a piston end, the other end of the piston body being in the form of a yoke which is mounted for reciprocating motion in the housing, a cam follower carried between the arms of the yoke for engaging the cam face of the cam, a cylinder head having a piston cylinder therein for receiving the piston end, the housing having an end opening for receiving said cylinder head, a guide bushing mounted in the cylinder head for facilitating the assembly of the piston end, an inner bearing bore for the piston end disposed adjacent the guide bushing, a high-pressure seal disposed adjacent the inner bearing bore, the piston end having substantial radial end play, and a piston spring mounted for urging the piston inwardly to maintain the cam follower in engagement with the cam face:
REFERENCES:
patent: 1723874 (1929-08-01), Lunge
patent: 2010377 (1935-08-01), Sassen
patent: 2992619 (1961-07-01), Nilges
patent: 3287993 (1966-11-01), Lomicki
patent: 3323461 (1967-06-01), Bonneff
patent: 3816029 (1974-06-01), Bowen
patent: 3981620 (1976-09-01), Abrahams
patent: 4105371 (1978-08-01), Sauage
patent: 4195970 (1980-01-01), Zalis
Leka George T.
Paradis Roland C.
Freeh William L.
Grimes E. T.
Hays R. A.
Masselle F. L.
The Perkin-Elmer Corporation
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