Pumps – Expansible chamber type – Valved piston
Patent
1993-08-25
1995-01-10
Bertsch, Richard A.
Pumps
Expansible chamber type
Valved piston
4175551, F04B 2104
Patent
active
053801750
ABSTRACT:
A fluid feed pump which prevents fluid from leaking or flowing back from a discharging side section into a suction side section when fluid sucked into the pump from the suction side section is to be fed into the discharging side section is disclosed. When a piston in a cylinder moves in a sucking/discharging direction, fluid flows into an inlet port side section in the inside of the cylinder through an inlet port while the inlet port side section and an outlet port side section of the inside of the cylinder are separated in an axial direction by a tubular enclosing member. Thereupon, since a lower portion of the tubular enclosing member is expanded in a radial direction to contact an outer circumferential face thereof in a water-tight condition with the inner face of the cylinder, the inlet and outlet port side sections of the cylinder are isolated in a high sealing condition from each other. Since the piston moves in the sucking/discharging direction while the inside of the cylinder is in the condition wherein the inlet and port side sections thereof are isolated from each other, fluid in the outlet port side section in the inside of the cylinder does not flow into the inlet port side section.
REFERENCES:
patent: 176330 (1876-04-01), Malmquist
patent: 2689533 (1954-09-01), Ericson
patent: 3752604 (1973-08-01), Dorn
patent: 3904325 (1975-09-01), Olofsson et al.
patent: 4975028 (1990-12-01), Schultz
patent: 5102052 (1992-04-01), Demarest et al.
Bertsch Richard A.
Fuji Xerox
McAndrews, Jr. Roland G.
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