Patent US4190301A successfully refreshed from Google Patents.
US4190301A
Expired / Lapsed
US
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Axial bearing for a roller drill bit
Assignee: SKF AB
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Filing: 1978-02-02
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Granted: 1980-02-26
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Expires: 1998-02-02
Abstract
Abstract An axial thrust bearing for a roller drill bit comprising a pair of one piece diamonds mounted in the axial end face of the journal and the interior of the cutting roller supported for rotation on the journal. Each diamond is mounted on a cup-shaped casing made of a softer metal than the journal and cutting roller. Preferably the confronting engaging bearing surfaces of the diamonds are spherical.
Inventors
- 👤 Leif Lachonius
- 👤 Dieter Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F; F16; F16C; F16C17/00; F16C17/04; F16C17/08; F16C21/00; F16C33/00; F16C33/02; F16C33/04; F16C33/043; F16C2352/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A roller drill bit comprising a journal, a cutting roller rotatably supported on said journal by bearing means including an axial bearing comprising a cup-shaped metallic casing of a material softer than the cutting roller and shaft journal mounted in the axial end face of the shaft journal and a cup-shaped metallic casing of a material softer than the cutting roller and shaft journal mounted in the interior of the tip of the cutting roller, a diamond supported in each casing having bearing surfaces in confronting engaging relation, each of said bearing surfaces being spherical.
Claim 2
Dependent Claim
95 words
A roller drill bit comprising a journal, a cutting roller rotatably supported on said journal by bearing means including an axial bearing comprising a cup-shaped metallic casing of a material softer than the cutting roller and shaft journal mounted in the axial end face of the shaft journal and a cup-shaped metallic casing of a material softer than the cutting roller and shaft journal mounted in the interior of the tip of the cutting roller, a diamond supported in each casing having bearing surfaces in confronting engaging relation, each of said bearing surfaces being spherical.
References Cited (Backward Citations)
US630574A
Cited
US2592277A
Cited
US2651501A
Cited
US3127942A
Cited
SU394539A1
Cited
GB1311854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |