Patent · US Expired

Rock drill

US4903787A · kind A · utility

14Cited by

6References

14Claims

0Family size

Assignee

Hawera Probst GmbH · DE

Inventors

Bernhard Moser · Altshausen, DE
Wolfgang Peetz · Blitzenreute, DE

Key dates

Filing date	Dec 15, 1988
Grant date	Feb 27, 1990
Priority date	—
Expiry date	Dec 15, 2008

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/58
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rock drill haivng a drill head with cruciform cutting tips is proposed which has improved chiselling properties in the case of percussive loading in hard rock or the like. For this purpose, the main cutting tip (4) is of a design know per se with secondary cutting tips (7,8) which are arranged transverse thereto and have a roof-shaped cross-section in side elevation. Additional, radially further outward bit points (16) for working the material result from the roof-shaped cross-section of the secondary cutting timps (7,8,) (cf. drawing).

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