Down-hole drilling hammer
Abstract
Abstract A DOWN-HOLE DRILLING HAMMER EMBODYING AN OUTER HOUSING STRUCTURE CONNECTIBLE TO A STRING OF ROTATABLE DRILL PIPE THROUGH WHICH COMPRESSED AIR IS PUMPED. A CYLINDER SLEEVE WITHIN THE HOUSING STRUCTURE DEFINES A HIGH PRESSURE AIR ANNULUS AND A LOW AIR PRESSURE ANNULUS THEREWITH. A HAMMER PISTON RECIPROCATES IN THE CYLINDER SLEEVE, THE PISTON AND CYLINDER SLEEVE HAVING PORTS AND PASSAGES TO ALTERNATELY COMMUNICATE THE HIGH PRESSURE AND LOW PRESSURE ANNULI WITH THE CYLINDER SLEEVE FIRST ABOVE AND BELOW THE PISTON AND THEN BELOW AND ABOVE THE PISTON TO RECIPROCATE THE PISTON AND CAUSE IT TO IMPACT REPEATEDLY UPON AN ANVIL CONNECTED TO OR INTEGRAL WITH A BIT ROTATABLE BY THE DRILL STRING, THE LOW PRESSURE AIR EXHAUSTING THROUGH THE BIT TO CONVEY THE CUTTINGS UPWARDLY AROUND THE DRILLING HAMMER AND DRILL IPE TO THE DRILLING RIG.
Inventors
- 👤 Alfred R Curington
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |