Reciprocating drive and velocity control for long stroke well pumping unit
Patent
·
OSTI ID:5541195
A yo-yo variety reciprocating drive for long stroke, well pumping units, which employ a flexible element as the operative link between the winding drum and the polish rod of the well pump. Reversal from an upstroke to a downstroke is cushioned by mechanism which provides a power source off dwell period of predetermined duration during the aforesaid stroke exchange and is adjustable to control the length of stroke of the pumping unit. A velocity control senses the velocity of the polish rod during such dwell period and re-energizes the power source when a predetermined velocity is achieved following reversal of direction.
- Assignee:
- Baker ProLift Inc.
- Patent Number(s):
- US 4496285
- OSTI ID:
- 5541195
- Country of Publication:
- United States
- Language:
- English
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