Patent · US Expired

Rock drill

US4549616A · kind A · utility

17Cited by

4References

6Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

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

Key dates

Filing date	Apr 5, 1984
Grant date	Oct 29, 1985
Priority date	—
Expiry date	Apr 5, 2004

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 section from the surface of the shaft decreases in the direction toward the shank. The groove sections with stepped bottom commence at a certain axial length from the cutting bit.

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