Patent · US Expired

Rock drill

US4458769A · kind A · utility

1Cited by

4References

2Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Gerhard Rumpp · Herrsching am Ammersee, DE
Dieter Scholz · Germering, DE

Key dates

Filing date	Apr 13, 1981
Grant date	Jul 10, 1984
Priority date	—
Expiry date	Apr 13, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/9097
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rock drill is formed of an axially elongated member made up of a cutting bit at one end followed by a helically grooved shaft and then ending in a shank. At least a portion of the groove, viewed in the axial direction of the member, has a stepped bottom providing groove sections of different depths. The depth of the groove sections from the surface of the shaft decreases in the direction toward the shank.

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