Rolling cutter drill bits
US6416224B1 · kind B1 · utility
1Cited by
15References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Nov 17, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rolling cutter drill bit comprises a body and three legs, each leg having a cantilevered bearing spindle, a roll cutter rotatably mounted on the bearing spindle, a lubricating system within the spindle, and a tubular bearing element located radially between the spindle and the rolling cutter. The tubular bearing element is formed of a wrought alloy material consisting primarily of chromium carbide and cobalt and having a yield strength of less than 120,000 psi and a ductility greater than 4%, both at room temperature, and is of low wall thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.