Drag type drill bit
US4660659A · kind A · utility
37Cited by
9References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1985 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Aug 6, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/573
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drag-type drill bit comprises a bit body having an operating end face and a multiplicity of superhard cutting elements interlocked to the bit body. The cutting elements define a multiplicity of cutting areas dispersed over the operating end face of the bit body in a pattern adapted to cause the cutting areas to cut an earth formation to a desired three-dimensional profile as the bit body is rotated. The cutting areas have back rake angles which become more negative with distance from said profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.