Pumps – Expansible chamber type – Plural pumping chambers
Patent
1978-05-01
1979-10-16
Croyle, Carlton R.
Pumps
Expansible chamber type
Plural pumping chambers
366161, 366162, F04B 2100, G05D 1100
Patent
active
041711912
ABSTRACT:
Apparatus is provided for moving controlled quantities of a material from one location to another and increasing the pressure thereof. The apparatus includes at least two cylinders having rams reciprocable therein. The rams are driven by a rocker arm which is pivotally connected to outer ends of both rams and is pivotally supported at a position therebetween. The arm is driven through a fluid-operated cylinder having a piston rod connected to one end of the arm, thereby reciprocating the rams in opposite directions. The ram cylinders have inlets connected to a source of the material under low positive pressure with a ball check valve located between the source and each inlet. Outlets of these cylinders are connected to a common outlet with a ball check valve also located between the common outlet and each cylinder outlet. The valves are arranged so that the inlet check valves and the outlet check valves operate in opposing relationship to provide positive opening and closing action and a precise flow of material. An adjustable back-pressure valve places back pressure on the material at the outlet with the pressure exceeding the pressure of the material at the source.
REFERENCES:
patent: 202178 (1878-04-01), Laney
patent: 268676 (1882-12-01), Hopkins
patent: 291859 (1884-01-01), Crawford
patent: 543954 (1895-08-01), Wistrand
patent: 1611703 (1926-12-01), Zabriskie
patent: 2142062 (1938-12-01), Thurman
patent: 3123342 (1964-03-01), Little
patent: 3289607 (1966-12-01), Delligatti
patent: 3684250 (1972-08-01), Roeser
Croyle Carlton R.
Gutchess, Jr. Allen D.
Smith Leonard E.
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