Steerable rotary drilling device
US6640909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Jun 12, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fulcrum bearing assembly for rotatably supporting a shaft within a housing, including at least one row of spherical thrust bearings positioned at a first axial position within the housing, at least one row of spherical thrust bearings positioned at a second axial position within the housing and at least one row of spherical radial bearings positioned at a third axial position within the housing. The third axial position is located between the first and second axial positions. Further, a bearing preload assembly for maintaining a bearing assembly in a preloaded condition, including a thrust bearing shoulder associated with a housing and a thrust bearing collar. The bearing assembly is axially maintained within the housing between the thrust bearing shoulder and the thrust bearing collar, wherein the thrust bearing collar is axially adjustable relative to the thrust bearing shoulder in order to preload the bearing assembly therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.