Patent US3079558A successfully refreshed from Google Patents.
Patent US3753470A successfully refreshed from Google Patents.
US3753470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric drill tool
Assignee: Sandvik AB
•
Filing: 1971-11-29
•
Granted: 1973-08-21
•
Expires: 1991-11-29
Abstract
Abstract For use in drilling through earthy material into underlying rock, the eccentric drill tool of the present invention is generally characterized by two cutting portions, with a central portion which is fixed in relation to the drill rod and an eccentric portion which can be shifted between protruding and retracted positions.
Inventors
- 👤 G Lagerstrom
- 👤 Wiredal H Ingvar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:21
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/20; E21B10/00; E21B10/26; E21B10/265; E21B10/36; E21B10/40; E21B10/64; E21B10/66
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
Eccentric drill tool, for percussion drilling with drill rod means within casing tube means, which comprises two cutting parts, to wit (1) a centric part that is fixed in relation to the drill rod means and (2) an eccentric part, in the form of a sleeve, which eccentric part is shiftable in relation to the drIll rod means between two different positions, in one of the positions said eccentric part protruding laterally in front of the casing tube means whereas in the other of said positions said eccentric part is contracted laterally and retractable within the casing tube means, said tool further comprising a guiding piece acting against the inside of the casing tube and serving to limit lateral movement of the tool.
Claim 2
Dependent Claim
123 words
Eccentric drill tool, for percussion drilling with drill rod means within casing tube means, which comprises two cutting parts, to wit (1) a centric part that is fixed in relation to the drill rod means and (2) an eccentric part, in the form of a sleeve, which eccentric part is shiftable in relation to the drIll rod means between two different positions, in one of the positions said eccentric part protruding laterally in front of the casing tube means whereas in the other of said positions said eccentric part is contracted laterally and retractable within the casing tube means, said tool further comprising a guiding piece acting against the inside of the casing tube and serving to limit lateral movement of the tool.
Claim 3
Dependent Claim
25 words
Drill tool as defined in claim 1, in which the sleeve is turnable on an eccentric portion of a shank portion of the centric part.
Claim 4
Dependent Claim
36 words
Drill tool as defined in claim 1, in which the sleeve is axially movable on a shank of the centric part between two portions of said shank that are laterally displaced in relation to each other.
Claim 5
Dependent Claim
24 words
Drill tool as defined in claim 1, in which the centric part is a standard drill bit usable for drilling without casing tube means.
Claim 6
Dependent Claim
36 words
Drill tool as defined in claim 2, in which rotary movement of the sleeve is limited by two axially protruding, sideways abutting projections, one situated on the sleeve and the other fixed on the drill rod.
Claim 7
Dependent Claim
29 words
Drill tool as defined in claim 5, in which the projection on the sleeve protrudes forwardly and the other projection is situated on the drill bit and protrudes rearwardly.
Claim 8
Dependent Claim
43 words
Drill tool as defined in claim 6, in which the projections have inclined abutting surfaces, the rotation of the drill during drilling exerting a wedging action between the abutting surfaces, urging the sleeve rearwardly against a shoulder on the drill above the sleeve.
Claim 9
Dependent Claim
26 words
Drill tool as defined in claim 7, in which the shoulder is formed by the fore end surface of a sleeve serving as the guiding means.
Claim 10
Dependent Claim
24 words
Drill tool as defined in claim 2, in which the shank portion, on which the sleeve is journalled, is integral with the drill bit.
References Cited (Backward Citations)
US1065294A
Cited
US1515819A
Cited
US1745650A
Cited
US1776611A
Cited
US1805806A
Cited
US2382725A
Cited
US3400773A
Cited
US3416616A
Cited
US3648789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |