Chisel holder

US9228434B2 · kind B2 · utility

Assignee

• Wirtgen GmbH

Inventors

• Thomas Lehnert · Oberraden, DE
• Karsten Buhr · Willroth, DE
• Martin Lenz · Graz, AT
• Cyrus Barimani · Rübhausen, DE
• Günter Hähn · Rübhausen, DE
• Karl Kammerer · Fluorn-Winzeln, DE
• Markus Roth · Schenkenzell, DE
• Bernhard Diessner · Fulpmes, AT

Key dates

• Filing date: Dec 2, 2011
• Grant date: Jan 5, 2016
• Expiry date: Dec 2, 2031

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21C35/197
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

The subject matter of the invention is a bit holder for an earth working machine, in particular a road milling machine, having a support member onto which an insertion projection is indirectly or directly attached on an insertion projection side, the insertion projection comprising at least one convex abutment surface and one pressure surface. In a bit holder of this kind, working forces can be dissipated in stress-optimized fashion into an attached base part when provision is made that the insertion projection comprises two convex abutment surfaces that are arranged at a distance from one another.