Drill bit
US4330229A · kind A · utility
60Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1980 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Dec 4, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drill bit having a generally cylindrical body with a working end and flutes extending along the body. The working end is formed with a central work-engaging point and a pair of slitting spurs spaced outwardly from the point adjacent edge margins of the body. Convexly contoured portions interconnect the point and spurs to permit sharpening with a round file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.