Two-piece drill bits
US6572311B2 · kind B2 · utility
24Cited by
6References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Jul 24, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/957
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Two-piece drill bits and methods of manufacturing same provide a preferably hexagonal shank, and a drill portion having a proximal end inserted into an axial hole in a distal end of the shank. In a preferred embodiment, at least part of the area adjacent the proximal end of the drill portion is knurled. Alternative embodiments have wings, polygons, tapers or other irregular shapes, or combinations of same. A variety of means may be employed to mechanically capture the drill portion in the shank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.