Patent US1995621A successfully refreshed from Google Patents.
US3144086A
Expired / Lapsed
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Gang drill
Assignee: Ingersoll Rand Co
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Filing: 1962-04-09
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Granted: 1964-08-11
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Expires: 1982-04-09
Abstract
No abstract record available.
Inventors
- 👤 Ewald H Kurt
- 👤 John W Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:47
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/16; E21B10/00; E21B10/36; E21B10/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A GANG DRILL COMPRISING: A BODY COMPOSED OF A CLUSTER OF CONVENTIONAL DOWN-THE-HOLE FLUID-POWERED PERCUSSIVE DRILLS LOCATED IN PARALLEL RELATIONSHIP, EACH OF SAID DRILLS INCLUDING A SEPARATE CASING HAVING A SLIDABLY MOUNTED DRILL BIT AT THE FRONT END OF SAID BODY FOR INDEPENDENT RECIPROCATING MOVEMENT RELATIVE TO THE BITS OF THE OTHER DRILLS AND A FLUID-OPERATED PERCUSSIVE IMPACT MECHANISM IN SAID CASING ADAPTED TO STRIKE SUCCESSIVE AXIAL IMPACTS TO THE DRILL BIT; SAID DRILLS BEING ARRANGED SO THAT THEIR BITS COOPERATE WITH EACH OTHER TO DRILL A LARGE HOLLOW CYLINDRICAL HOLE DURING THE OPERATION OF THE GANG DRILL; A HEAD LOCATED AT THE REAR END OF SAID BODY AND CONTAINING A CENTRAL FLUID SUPPLY PASSAGE AND A PLURALITY OF BRANCH PASSAGES FOR FEEDING FLUID PRESSURE FROM SAID CENTRAL SUPPLY PASSAGE TO EACH OF SAID DOWN-THE-HOLE DRILLS; SAID SEPARATE DRILL CASINGS BEING SUBSTANTIALLY RIGID-
Claim 2
Dependent Claim
143 words
A GANG DRILL COMPRISING: A BODY COMPOSED OF A CLUSTER OF CONVENTIONAL DOWN-THE-HOLE FLUID-POWERED PERCUSSIVE DRILLS LOCATED IN PARALLEL RELATIONSHIP, EACH OF SAID DRILLS INCLUDING A SEPARATE CASING HAVING A SLIDABLY MOUNTED DRILL BIT AT THE FRONT END OF SAID BODY FOR INDEPENDENT RECIPROCATING MOVEMENT RELATIVE TO THE BITS OF THE OTHER DRILLS AND A FLUID-OPERATED PERCUSSIVE IMPACT MECHANISM IN SAID CASING ADAPTED TO STRIKE SUCCESSIVE AXIAL IMPACTS TO THE DRILL BIT; SAID DRILLS BEING ARRANGED SO THAT THEIR BITS COOPERATE WITH EACH OTHER TO DRILL A LARGE HOLLOW CYLINDRICAL HOLE DURING THE OPERATION OF THE GANG DRILL; A HEAD LOCATED AT THE REAR END OF SAID BODY AND CONTAINING A CENTRAL FLUID SUPPLY PASSAGE AND A PLURALITY OF BRANCH PASSAGES FOR FEEDING FLUID PRESSURE FROM SAID CENTRAL SUPPLY PASSAGE TO EACH OF SAID DOWN-THE-HOLE DRILLS; SAID SEPARATE DRILL CASINGS BEING SUBSTANTIALLY RIGID-
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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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |