Small drill
US6976812B2 · kind B2 · utility
3Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Dec 20, 2005 |
| Priority date | — |
| Expiry date | Nov 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A small drill includes one chip-discharging flute which is helically formed in the exterior surface of a cutting portion of the small drill. The small drill also includes a flute-shaped portion which is formed in the front region of the chip-discharging flute in the rotating direction, which is connected to the chip-discharging flute, and which is open at the exterior surface of the cutting portion. The core diameter ratio d/D, in percent, of the small drill is set to 60% or more, and a margin angle θ thereof is set to 120° or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.