Lift pump units
Abstract
Abstract TORQUE LOAD FLUCTUATIONS ON THE PRIME MOVER OF OIL WELL PUMPS AND THE LIKE HAVING A ROTARY CRANK FOR DRIVING A WALKING BEAM ARE MINIMIZED THROUGH COUPLING OF THE PITMANS TO THE WALKING BEAM ALONG A MOVABLE LINE OF CONTACT BETWEEN ABUTTING BEARING SURFACES THAT ARE AFFIXED TO THE PITMANS AND THE BEAM RESPECTIVELY, AND THAT ARE HELD IN NONSLIDING ROLLING ENGAGEMENT WITH EACH OTHER, SO THAT THE LEVER ARM DISTANCE BETWEEN THE LINE OF CONTACT AND THE PIVOT AXIS OF THE WALKING BEAM VARIES AS THE ANGLE BETWEEN THE PITMANS AND THE BEAM CHANGES WITH ROTATION OF THE CRANK TO PROVIDE A GREATER MECHANICAL ADVANTAGE DURING THE POWER STROKE OF THE PUMP AND A LESSER MECHANICAL ADVANTAGE DURING ITS RETURN STROKE.
Inventors
- 👤 Wendell S Miller
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |