Patent · US Expired

Bit holder with a detachably fixed bit bushing

US5498069A · kind A · utility

10Cited by

8References

3Claims

0Family size

Assignee

Voest-Alpine Bergtechnik Gesellschaft m.b.H. · AT

Inventors

Gottfried Siebenhofer · Wien, AT
Alfred Zitz · Zeltweg, AT
Roman Gerer · Zeltweg, AT

Key dates

Filing date	Nov 9, 1994
Grant date	Mar 12, 1996
Priority date	—
Expiry date	Nov 9, 2014

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C35/188
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The bit holder (1) is nonpositively connected to a bit bushing (3) with adherence to a pressure per unit of surface area of >100N/mm.sup.2 between the conical outer surface of the bit bushing (3) and the inner wall of the receiving bore (2) of the bit holder (1). After the bushing has been driven into the receiving bore (2), the conical outer surface of the bit bushing (3), formed by rectilinear generatrices, protrudes beyond the bore (2) by an excess amount (a).

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