Pumps – Motor driven – Fluid motor
Patent
1981-11-12
1984-07-31
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417403, F04B 1700
Patent
active
044627645
ABSTRACT:
A hydraulically powered long stroke pumping unit including support means with a first pump unit mounted on said support means. The first pumping unit includes a first pump cylinder and first piston means reciprocable in said first pump cylinder and a piston rod extending outwardly from said first pump cylinder. A second pump unit is mounted on the support means in opposed aligned, spaced relationship with said first pump unit, and the second pump unit includes a second pump cylinder and a second piston means reciprocable in the second pump cylinder. The second piston means includes a piston rod extending outwardly from the second pump cylinder toward the piston rod of the first pump cylinder. The piston rods extend toward one another along a common central longitudinal axis, and a pump drive bar is connected to the outermost ends of the piston rods. A hydraulic drive means is connected to selectively and positively drive the pump drive bar in opposite directions in a single plane.
REFERENCES:
patent: 5352 (1847-11-01), Boardman, Jr.
patent: 294859 (1884-03-01), Dickie
patent: 655232 (1900-08-01), Heisler
patent: 2283207 (1942-05-01), Hollander
patent: 2495669 (1950-01-01), Cannon
patent: 2540347 (1951-02-01), Pounds
patent: 2887955 (1959-05-01), Owen
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