Oil well pumping apparatus and method
Patent
·
OSTI ID:5588601
An oil well pumping apparatus and method has an increased walking beam distance ratio of saddle pivot-polished rod distance to saddle pivot-equalizer pivot distance of at least 1.4:1. A crank arm axis is positioned substantially to the rear of the equalizer pivot and the pitman rod is connected to the crank arm at any selected stroke point along a crank arm wrist pin angle line offset at an angle to the center line of the crank arm. A precise counterbalancing is provided by radial adjustability of a weight assembly on the crank arm, a floating safety lock assembly and the addition to or subtraction from auxiliary weights on a main weight member. The beneficial results of the present invention include reduction of peak torque requirements, elimination of gear reducer load reversals, and lower sucker rod stress throughout a very wide range of pumping applications with a universal piece of hardware.
- Assignee:
- Advanced Pumping Systems, Inc.
- Patent Number(s):
- US 4505162
- OSTI ID:
- 5588601
- Country of Publication:
- United States
- Language:
- English
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