Patent US3741315A successfully refreshed from Google Patents.
US3741315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling or cutting or earth strata
Assignee: MINING DEV AG
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Filing: 1970-12-23
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Granted: 1973-06-26
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Expires: 1990-12-23
Abstract
Abstract A method and device for drilling in which a tool or cutting bit is subjected to an oscillatory action. It may also be subjected to a percussive, vibratory or axial thrust action.
Inventors
- 👤 A Hilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:58
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; E21B10/00; E21B10/36; E21B10/40; E21B7/00; E21B7/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
An apparatus for drilling or cutting earth strata comprising a base, a boom mounted in the base, a drill rod, having opposite ends, said drill rod being arranged parallel with the boom and movable relative thereto, a cutting tool or bit secured to one end of the drill rod, a percussive unit movably mounted on the boom acting on the opposite end of the drill rod to apply axial percussive forces thereto, an oscillatory unit mounted on the boom and traversed by the drill rod so that the drill rod is movable axially of the oscillatory unit while being subject to transverse oscillatory movements thereby, and means moving the Percussive unit and consequently the drill rod and cutting tool or bit along the boom to urge the latter into the earth strata.
Claim 2
Independent Claim
132 words
An apparatus for drilling or cutting earth strata comprising a base, a boom mounted in the base, a drill rod, having opposite ends, said drill rod being arranged parallel with the boom and movable relative thereto, a cutting tool or bit secured to one end of the drill rod, a percussive unit movably mounted on the boom acting on the opposite end of the drill rod to apply axial percussive forces thereto, an oscillatory unit mounted on the boom and traversed by the drill rod so that the drill rod is movable axially of the oscillatory unit while being subject to transverse oscillatory movements thereby, and means moving the Percussive unit and consequently the drill rod and cutting tool or bit along the boom to urge the latter into the earth strata.
Claim 3
Dependent Claim
27 words
The apparatus according to claim 1 comprising a carriage movable along the boom and mounting the percussive unit acting on the other end of the drill rod.
Claim 4
Dependent Claim
33 words
The apparatus according to claim 2 in which the carriage is movable along the boom by axial thrust means comprising a double-acting fluid ram connected to the carriage by flexible elements and pulleys.
Claim 5
Dependent Claim
95 words
The apparatus according to claim 3, in which the carriage, at one end, is secured to a pulley connected to the piston of the double-acting fluid ram by a single wire rope to give single purchase to the carriage when it is being moved away from the drilling end of the apparatus while it is secured at its other end by two wire ropes to a pair of pulleys connected to the ram piston so that double purchase is given to the carriage when it is being moved towards the drilling end of the apparatus.
Claim 6
Dependent Claim
30 words
The apparatus according to claim 1, in which the boom is pivotally mounted on the base and its attitude relative to the base is controlled by a fluid operated ram.
Claim 7
Dependent Claim
31 words
The apparatus according to claim 5 comprising a hydraulic control system operating the oscillatory unit, the percussive unit, the double-acting fluid ram and the fluid operated ram for pivoting the boom.
Claim 8
Dependent Claim
22 words
The apparatus according to claim 1, in which the cutting tool or bit is of circular configuration and has hardened metal inserts.
Claim 9
Dependent Claim
22 words
The apparatus according to claim 1, in which the cutting tool or bit is of transversely elongated configuration with hardened metal inserts.
Claim 10
Dependent Claim
29 words
The apparatus according to claim 8, in which the hardened metal inserts are provided both on the leading face of the tool or bit and on the peripheral surface.
Claim 11
Dependent Claim
28 words
The apparatus according to claim 8, in which the tranversely elongate bit is provided with a leading pilot bit of circular configuration and also provided withhardened metal inserts.
Claim 12
Dependent Claim
18 words
The apparatus according to claim 9, in which the pilot bit is central of the tranversely elongated bit.
Claim 13
Dependent Claim
22 words
The apparatus according to claim 9, in which the pilot bit is offset of the central axis of the transversely elongate bit.
Claim 14
Dependent Claim
24 words
Apparatus according to claim 1, comprising means limiting the oscillatory movement of the oscillatory unit and consequently the drill rod to 22 1/2 *.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |