Twist drill for dry drilling

US6309149A · kind A · utility

Assignee

• Kennametal PC Inc. · US

Inventors

• Bernhard Borschert · Bamberg, DE
• Jürgen Seidel · Kreuztal, DE

Key dates

• Filing date: Dec 23, 1999
• Grant date: Oct 30, 2001
• Expiry date: Dec 23, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/9097
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A drill used for dry drilling, characterized by the asymmetry of those cutting edge parts only whose faces are in the drill core area, in particular its entire chisel edge. This asymmetry can result from the fact that the individual chisel edges have different lengths.