Rock drill

US4951761A · kind A · utility

Assignee

• Hawera Probst GmbH · DE

Inventors

• Wolfgang Peetz · Blitzenreute, DE
• Bernhard Moser · Altshausen, DE
• August Haussmann · Ravensburg, DE

Key dates

• Filing date: May 31, 1989
• Grant date: Aug 28, 1990
• Expiry date: May 31, 2009

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/58
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A rock drill having a drilling head which, in an asymmetric arrangement relative to the main cutting tip, has at least one additional secondary cutting tip, the angle enclosed between the single cutting edge of the main cutting tip and the secondary cutting tip being formed as an acute angle.