Free breathing lubrication system for sealed bearing rock bits
Abstract
Abstract THREE INDIVIDUAL LUBRICANT RESERVOIRS ARE POSITIONED IN A THREE CONE ROTARY ROCK BIT WITH ONE OF THE RESERVOIRS IN EACH OF THE THREE ARMS OF THE BIT FOR SUPPLYING LUBRICANT TO THE BIT BEARING SYSTEMS LOCATED BETWEEN EACH OF THE THREE INDIVIDUAL CONE CUTTERS AND THE BEARING SHAFTS UPON WHICH THE ROTATE. A SEAL IS POSITIONED BETWEEN EACH OF THE CONE CUTTERS AND ITS BEARING SHAFT TO PREVENT THE LUBRICANT FROM ESCAPING INTO THE BOREHOLE AND TO PREVENT HOREHOLE FLUIDS AND DEBRIS FROM ENTERING THE BEARING AREA. A PASSAGEWAY EXTENDS FROM EACH OF THE LUBRICANT RESERVOIRS TO THE EXTERIOR OF THE BIT AND A FREE BREATHING POROUS FILTER PLUG IS POSITIONED IN EACH OF THE PASSAGEWAYS THEREBY EQUALIZING THE INTERNAL PRESSURE OF LUBRICANT IN THE LUBRICANT RESERVOIR AND THE HYDROSTATIC PRESSURE OF DRILLING FLUID IN THE WELL BORE.
Inventors
- 👤 W Bell
Bibliographic Details
Claims Analysis
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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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |