Hydraulic drive pump apparatus
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United States of America Patent
Stats
-
Oct 2, 1984
Grant Date -
N/A
app pub date -
Jun 9, 1981
filing date -
Jun 9, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkage transmits oscillatory sine function motion of the walking beam for movement of the control lever as intermediate biasing force prevents nulling of the system.
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Cited Art Landscape
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