Chisel

US8215415B2 · kind B2 · utility

Assignees

• Hawera Probst GmbH · DE
• Aresi S.P.A. · IT

Inventors

• Marco Lang · Ravensburg, DE
• Franc Koljaka · Louisville, US
• Friedmar Dresig · Chemnitz, DE
• Thomas Bernhardt · Neckartenzlingen, DE

Key dates

• Filing date: Jul 8, 2002
• Grant date: Jul 10, 2012
• Expiry date: Aug 3, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/907
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A tool bit for a chisel or a hammer drill, in particular, a insertable chisel or insertable drill for power-driven drill and chisel hammers, has an insertion end, with a chisel shank or drill shank, and a chisel head or drill shank located opposite the insertion end. The diameter of the shank increases in the direction of the chisel head at least once from a first, small diameter to a second, large diameter and decreases again from this to a small diameter or forms at least one bead.