Patent US3484121A successfully refreshed from Google Patents.
US4284375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-lip tool for deep drilling
Assignee: TBT Tiefbohrteckhik GmbH and Co KG
•
Filing: 1979-11-02
•
Granted: 1981-08-18
•
Expires: 1999-11-02
Abstract
Abstract A one-lip tool for deep drilling has a drill shaft, and a clamping sleeve and a drill head arranged at the opposite ends of the drill shaft. The drill shaft has a peripheral surface including two diametrically opposite surface portions. A chip groove is provided in one of the surface portions. A reinforcing formation, such as at least one inwardly extending rib, is provided in the other opposite surface portion of the drill shaft.
Inventors
- 👤 Bruno Muhleisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:24
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0486; B23B51/06; B23B51/063; B23B51/066; Y; Y10; Y10S; Y10S408/00; Y10S408/705; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/907; Y10T408/909; Y10T408/9095
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A one-lip tool for deep drilling, comprising a clamping sleeve; a drill head having a drilling blade; and a drill shaft having an axis and two axial ends at one of which ends said clamping sleeve is arranged and at the other of which ends said drill head is arranged, said drill shaft having a peripheral surface including two diametrically opposite surface portions, said drill shaft having an axially extending chip groove in one of said surface portions and at least one projection in the region of the other of said surface portions, said projection forming a radially inwardly extending rib and terminating at an axial distance from said clamping sleeve and said drill head.
Claim 2
Dependent Claim
115 words
A one-lip tool for deep drilling, comprising a clamping sleeve; a drill head having a drilling blade; and a drill shaft having an axis and two axial ends at one of which ends said clamping sleeve is arranged and at the other of which ends said drill head is arranged, said drill shaft having a peripheral surface including two diametrically opposite surface portions, said drill shaft having an axially extending chip groove in one of said surface portions and at least one projection in the region of the other of said surface portions, said projection forming a radially inwardly extending rib and terminating at an axial distance from said clamping sleeve and said drill head.
Claim 3
Dependent Claim
16 words
A tool as defined in claim 1, wherein said chip groove has a V-shaped cross section.
Claim 4
Dependent Claim
18 words
A tool as defined in claim 1, wherein said drill shaft is constituted of a cold-deformed profile tube.
Claim 5
Dependent Claim
21 words
A tool as defined in claim 1, wherein said other surface portion has a cross section shaped as a circular arc.
Claim 6
Dependent Claim
19 words
A tool as defined in claim 1, wherein said projection extends parallel to said axis or said drill shaft.
Claim 7
Dependent Claim
16 words
A tool as defined in claim 1, wherein said distance is equal to substantially 1 cm.
Claim 8
Dependent Claim
32 words
A tool as defined in claim 1, wherein said drill shaft further has a second such projection, said first-mentioned projection and said second projection forming therebetween an additional radially outwardly extending rib.
Claim 9
Dependent Claim
52 words
A tool as defined in claim 1, wherein the tool has a predetermined direction of rotation, said one surface portion provided with said chip groove being a leading portion, and said other surface portion provided with said projection being a trailing portion, as considered in the direction of rotation of the tool.
References Cited (Backward Citations)
US841184A
Cited
US2895355A
Cited
US2935906A
Cited
US3010345A
Cited
US4212569A
Cited
DE2819720A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |