Patent · US Expired

Bit of circular cross-section

US4159746A · kind A · utility

13Cited by

6References

7Claims

0Family size

Assignee

Vereinigte Osterreichische Eisen- und Stahlwerke - Alpine Montan Aktiengesellschaft · AT

Inventors

Herwig Wrulich · Zeltweg, AT
Karlheinz Gehring · Trofaiach, AT
Alfred Zitz · Zeltweg, AT

Key dates

Filing date	Apr 13, 1977
Grant date	Jul 3, 1979
Priority date	—
Expiry date	Apr 13, 1997

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C35/1837
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A cutting bit includes a bit tip and a shaft having a portion tapered toward the tip and having a reduced diameter between the tapered portion and the portion intended to be inserted in a holder. The bit tip has the shape of a body of revolution with convex generatrices.

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