Patent CH168360A successfully refreshed from Google Patents.
US3157237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill
Assignee: Ingersoll Rand Co
•
Filing: 1962-04-18
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Granted: 1964-11-17
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Expires: 1982-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ewald H Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:34
CPC Classifications
E; E21; E21B; E21B6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A POWER SYSTEM FOR A ROCK DRILL HAVING A DRILL STEEL, COMPRISING A ROTARY FLUID MOTOR DRIVINGLY CONNECTED TO THE DRILL STEEL, VALVE MEANS CONNECTED TO THE ROTARY FLUID MOTOR HAVING AN INLET TO RECEIVE PRESSURE FLUID TO DRIVE SAID FLUID MOTOR FOR ROTATING THE DRILL STEEL, MEANS BIASING THE VALVE MEANS TO AN OPEN POSITION FOR CONTINUOUSLY ROTATING THE STEEL, A DRILL MOTOR HAVING A RECIPROCALLY DRIVEN HAMMER PISTON TO INTERMITTENTLY IMPART AXIAL DRIVING FORCES TO THE DRILL STEEL, SAID DRILL MOTOR HAVING INLET MEANS TO RECEIVE PRESSURE FLUID AND PASSAGE MEANS CONNECTING THE DRILL MOTOR TO THE VALVE MEANS TO PROVIDE PRESSURE FLUID FOR CLOSING THE VALVE MEANS AGAINST THE BIASING MEANS AS THE HAMMER PISTON MOVES AWAY FROM THE DRILL STEEL TO BLOCK THE PRESSURE FLUID DRIVING THE ROTARY FLUID MOTOR AND MOMENTARILY STOP ROTATION OF THE DRILL STEEL WHEN THE DRILL MOTOR IMPARTS AXIAL FORCES THERETO.
Claim 2
Dependent Claim
150 words
A POWER SYSTEM FOR A ROCK DRILL HAVING A DRILL STEEL, COMPRISING A ROTARY FLUID MOTOR DRIVINGLY CONNECTED TO THE DRILL STEEL, VALVE MEANS CONNECTED TO THE ROTARY FLUID MOTOR HAVING AN INLET TO RECEIVE PRESSURE FLUID TO DRIVE SAID FLUID MOTOR FOR ROTATING THE DRILL STEEL, MEANS BIASING THE VALVE MEANS TO AN OPEN POSITION FOR CONTINUOUSLY ROTATING THE STEEL, A DRILL MOTOR HAVING A RECIPROCALLY DRIVEN HAMMER PISTON TO INTERMITTENTLY IMPART AXIAL DRIVING FORCES TO THE DRILL STEEL, SAID DRILL MOTOR HAVING INLET MEANS TO RECEIVE PRESSURE FLUID AND PASSAGE MEANS CONNECTING THE DRILL MOTOR TO THE VALVE MEANS TO PROVIDE PRESSURE FLUID FOR CLOSING THE VALVE MEANS AGAINST THE BIASING MEANS AS THE HAMMER PISTON MOVES AWAY FROM THE DRILL STEEL TO BLOCK THE PRESSURE FLUID DRIVING THE ROTARY FLUID MOTOR AND MOMENTARILY STOP ROTATION OF THE DRILL STEEL WHEN THE DRILL MOTOR IMPARTS AXIAL FORCES THERETO.
References Cited (Backward Citations)
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Cited
US1761310A
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US1804066A
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US2072607A
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US2618241A
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US3082741A
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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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |