Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1994-05-31
1996-02-27
Bertsch, Richard A.
Pumps
Expansible chamber type
Pumping member position controlled port
417DIG1, 417499, F04B 706
Patent
active
054944201
ABSTRACT:
A self-aligning connection between a rotary and reciprocating pump piston allows relative radial movement between the pump piston and the rotary cam. The self-aligning connection is formed by a pin carried by the rotary cam and is positioned in a radial recess located in the pump piston. An improved drive for the rotary cam is perfected by a cam follower pin supported from the housing by a roller bearing race which is pressed fitted within a bore formed by the pump housing. The pump piston abuts a TEFLON pad located in the pump cylinder to reduce dead space and insure that the pump produces accurate volumes. The employment of different plastic materials between the rotary cam and the pump housing provides an improved bearing surface.
REFERENCES:
patent: 2981573 (1961-04-01), Retuer
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patent: 3382812 (1968-05-01), Smith
patent: 3972655 (1976-08-01), Tsunematsu et al.
patent: 4008003 (1977-02-01), Pinkerton
patent: 4476835 (1984-10-01), Laufer
patent: 4708605 (1987-11-01), Orlita
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patent: 5081910 (1992-01-01), D'Ascenzo, Jr.
patent: 5158441 (1992-10-01), Aid
Huza Mark
Mawhirt James A.
Olich Jack M.
Bertsch Richard A.
Diba Industries Inc.
Freeh William L.
Kim Ted
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