Patent · US Expired

Drill

US7882908B2 · kind B2 · utility

6Cited by

7References

4Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Olaf Koch · Kirchdorf an der Krems, AT
Joachim Woerz · Landsberg, DE
Karl Hofmann · Neckarrems, DE
Werner Britten · Riegelsberg, DE

Key dates

Filing date	Jun 9, 2005
Grant date	Feb 8, 2011
Priority date	—
Expiry date	May 22, 2026

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23B2251/50
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a one-piece drilling head (10, 20, 30) formed of a hard material and provided, at its first end (5), with at least one main bit having a tip (4) and at least one cutting structure (3) integral to the one-piece drilling head (10; 20; 30), and at a second end (6) located opposite the first end (5), with a bottom surface (7) for the mounting the drilling head (10; 20; 30) on the drill stem (8), and having a plurality of axially extending through-grooves (11; 21; 31) for removing drillings produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface (7) of the drilling head (10; 20; 30).

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