Drag bit and cutters
US4558753A · kind A · utility
71Cited by
11References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Feb 22, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/567
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill bit comprises a bit body having an operating end face. A plurality of self-sharpening cutters are mounted in the bit body and extend through the operating end face. The cutters have cutting faces adapted to engage an earth formation and cut the earth formation to a desired three-dimensional profile. The cutting faces define surfaces having back rake angles which decrease with distance from the profile. The individual cutting faces may be inwardly concave in a plane parallel to the intended direction of motion of the cutter in use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.