Hydrostatic bearing
US7621346B1 · kind B1 · utility
32Cited by
11References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2008 |
| Grant date | Nov 24, 2009 |
| Priority date | — |
| Expiry date | Sep 26, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roller cone bit having a sealed lubricant reservoir between a roller cone and a head section. A journal sleeve is included on the head section that circumscribes the journal bearing surface of the head section. The sleeve can axially pivot on the head section, but does not rotate thereon. The reservoir is formed into a journal bearing surface of the head section body and may be sealed by placing a seal around its periphery that extends between the journal bearing surface and journal sleeve. Sealing the reservoir results in a hydrostatic condition therein and substantially equalized pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.