Micro drill with modified drill point
US4602900A · kind A · utility
Inventors
Key dates
| Filing date | Sep 26, 1983 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Sep 26, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/9097
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The specification discloses a micro drill with a modified point in which the drill is formed from a rigid cylinder and has two opposed helical wings and helical edges. Each wing has an undercut leading surface to provide a positive rake angle at the helical edges of the wings, and the two wings have a smooth "S" shaped cross-section. Two opposed flanks are formed by an inclined cut in each of the wings providing the drill point with a somewhat V-shape, and a leading corner is defined on each of the wings at the intersection of the helical edge and the flanks. A cut is provided in each of the leading surfaces adjacent to and below the flanks thereby forming a cutting edge on the drill point with an increased positive cutting action. The drill may be cut so that an under-surface is formed immediately below each flank and its cutting edge and so that a side surface is formed in the wings in an orientation perpendicular to the under-surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.