Earth-boring bit with super-hard cutting elements
US6098730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | May 7, 2018 |
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 and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements. At least one of the cutting elements has a generally cylindrical body formed of hard metal with a convex cutting end. A plurality of substantially recesses are formed on the cutting end of the body. The recesses are configured such that a line parallel to the longitudinal axis of the body may extend from any point of each of the recess without touching any other point on the same recess. This enables the cutting element body and the recess to be formed simultaneously by conventional powder metallurgical techniques. A layer of super-hard material is formed on the cutting end of the body and overlays the recesses formed thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.