Patent US4240512A successfully refreshed from Google Patents.
US4240512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for guiding a bore-crown or bit along a given path
Assignee: Individual
•
Filing: 1979-02-26
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Granted: 1980-12-23
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Expires: 1999-02-26
Abstract
Abstract An arrangement for guiding a drill crown or bit (8) (FIG. 4) in a given drilling path comprises an outer guide tube (7) in which a shaft (6) is rotatably arranged. The shaft is driven by a drive means (5) connected to one end of the shaft, while the bit (8) is mounted for rotation on and guided by the other end of said shaft. The axis of rotation (9) of the bit forms an angle (α) with the central axis (10) of the guide tube, said tube being non-rotatably, but axially displaceably connected to an axially feeding device through intermediate means (11).
Inventors
- 👤 Mats T. Haglund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:14
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/062; E21B17/00; E21B17/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
A drilling assembly for use in earth and rock to correct misalignment of a drilled hole, including: an outer non-rotatable guide tube, a drive shaft rotatably mounted in the outer guide tube, a drill bit connected to one end of the drive shaft and journalled on the outer guide tube, a drill rod connected to the opposite end of the drive shaft, the axis of rotation of the drill bit being angularly offset relative to the longitudinal axis of the outer guide tube, and the longitudinal axis of the drill bit end of the drive shaft being aligned with the axis of rotation of the drill bit, said drive shaft being bent relative to the outer guide tube with the drill rod end of the drive shaft being co-axial with the outer guide tube and the intermediate portion of the drive shaft being eccentrically journalled in the outer guide tube.
Claim 2
Dependent Claim
150 words
A drilling assembly for use in earth and rock to correct misalignment of a drilled hole, including: an outer non-rotatable guide tube, a drive shaft rotatably mounted in the outer guide tube, a drill bit connected to one end of the drive shaft and journalled on the outer guide tube, a drill rod connected to the opposite end of the drive shaft, the axis of rotation of the drill bit being angularly offset relative to the longitudinal axis of the outer guide tube, and the longitudinal axis of the drill bit end of the drive shaft being aligned with the axis of rotation of the drill bit, said drive shaft being bent relative to the outer guide tube with the drill rod end of the drive shaft being co-axial with the outer guide tube and the intermediate portion of the drive shaft being eccentrically journalled in the outer guide tube.
Claim 3
Dependent Claim
13 words
The drilling assembly of claim 1 in which the drive shaft is flexible.
Claim 4
Dependent Claim
24 words
The drilling assembly of claim 1 in which a casing tube is fastened to the outer guide tube to prevent rotation thereof during drilling.
Claim 5
Dependent Claim
32 words
The drilling assembly of claim 1 in which a spindle forms the mounting between the outer guide tube and the drill bit with the spindle being journalled on the outer guide tube.
References Cited (Backward Citations)
US550783A
Cited
GB190820611A
Cited
FR657749A
Cited
US2292126A
Cited
US2516421A
Cited
US2644669A
Cited
US2669428A
Cited
US2669429A
Cited
FR1247454A
Cited
US3260318A
Cited
US3526285A
Cited
US3903974A
Cited
US4143722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |