Drilling bit

US4579180A · kind A · utility

Assignee

• Hawera Probst GmbH · DE

Inventors

• Wolfgang Peetz · Blitzenreute, DE
• Siegried Klaissle · Schlier, DE
• Bernhard Moser · Altshausen, DE
• August Hausmann · Gaimersheim, DE

Key dates

• Filing date: May 16, 1984
• Grant date: Apr 1, 1986
• Expiry date: May 16, 2004

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23B2251/046
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A drilling bit having two helical withdrawal grooves which extend from the drilling head in the direction toward the insertion or chucking end. The withdrawal grooves have least slope in the vicinity of the drilling head. In the other regions, the withdrawal grooves have a different slope. As a result, no cross-sectional jumps disposed at uniform intervals are provided on the drilling bit, so that transverse oscillations cannot be reinforced by partially constantly or continuously reflected pulses. A considerable reduction in noise is achieved. Furthermore, the central portion of the drilling bit, which is critical during drilling, receives great rigidity.