Earth-boring bit with wear-resistant shirttail
US6607047B1 · kind B1 · utility
20Cited by
19References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/52
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth-boring bit has a bit body that is threaded at one end for connection into a drill string. At least one cantilevered bearing shaft depends inwardly and downwardly from the bit body. A cutter is mounted for rotation on each bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows. At least one wear-resistant element is secured to the bit body between the lower end of the bit body and the threaded end, the wear-resistant element being elongate or generally oblong in cross-section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.