Earth-boring bit with improved bearing seal
US5655611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Aug 4, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/25
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base and a generally cylindrical bearing surface and at least one cutter is mounted for rotation on the bearing shaft. A bearing seal recess is formed generally at the base of the bearing shaft and defines a cylindrical seal face radially recessed from the journal bearing surface. A cutter seal recess is formed in the cutter generally opposite the bearing seal recess and defines a bearing cylindrical seal face. The cutter and bearing seal recesses define a seal gland including a pair of opposed radial seal surfaces. A resilient seal ring is disposed in the seal gland and compressed between the cylindrical seal faces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.