Patent · US Active

Hard material drilling head

US7559383B2 · kind B2 · utility

5Cited by

5References

15Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Olaf Koch · Kirchdorf an der Krems, AT
Karl Hofmann · Neckarrems, DE

Key dates

Filing date	May 4, 2007
Grant date	Jul 14, 2009
Priority date	—
Expiry date	Aug 15, 2027

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23B2251/204
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A solid hard material head for a percussion drilling tool rotatable about a rotational axis (A) in a rotational direction (ω), includes at least one main bit and at least one auxiliary bit (5), circumferentially offset relative to the at least one main bit (3) and having an auxiliary cutting edge (6) formed, at least piecewise, as a circular arc section (7) spaced from the rotational axis (A) radially inwardly and inclined in a radial direction, and a straight outer section (8) extending radially outwardly with respect to the circular arc section (7) and inclined in the radial direction.

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