Spiral drill
US4913603A · kind A · utility
17Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Jul 18, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A two-flute drill bit includes two drill webs each provided with a cutting lip. The cutting lips are unequally angularly spaced from each other and the smaller one of two pitch angles included between two cutting lips is preferably 160.degree.. One of the webs has two peripheral margin lands spaced from each other whereby a three-point guidance of the drill bit is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.