Patent · US Active

Drill head for rock drills

US8225889B2 · kind B2 · utility

1Cited by

5References

5Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Christoph Wetter · Feldkirch, AT
Roland Foser · Schaan, LI
Jens Schneider · Schweinfurt, DE
Markus Meierhofer · Passau, DE

Key dates

Filing date	Dec 17, 2009
Grant date	Jul 24, 2012
Priority date	—
Expiry date	May 22, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/909
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A drill head extending along a drill axis made of hard metal for rock drills is disclosed. The drill head features at least one major cutting edge and at least one minor cutting edge, where the major cutting edge extends from a first radially inner end to a first radial outer end which lies on a first diameter and where the minor cutting edge extends from a second radially inner end to a second radially outer end which lies on a second diameter that is smaller than the first diameter. A first enveloping surface defined by the minor cutting edge projects completely axially over a second enveloping surface defined by the major cutting edge.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.