Drill bit
US4687388A · kind A · utility
7Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1986 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | May 22, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drill bit is provided with a pair of cutting edges which are positioned so that a narrow slot is formed therebetween in an area including the rotational axis of the drill bit and so that the lines joining the rotational axis of the drill bit and the innermost points of the respective cutting edges are at an angle not larger than about 160.degree. with each other as viewed in the axial direction of the drill bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.