Patent · US Expired

Roller bit for tunnel-driving machines with segmented cutting rings

US6343842B1 · kind B1 · utility

14Cited by

22References

10Claims

0Family size

Assignee

Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik · DE

Inventors

Klaus Sauer · Wiesloch, DE
Guenter Fennel · Burghaun, DE
Ernst Heiderich · Hohenroda, DE
Bernd Heinrich Ries · Hünfeld, DE
Reinhold Walter · Rosdorf, DE

Key dates

Filing date	May 13, 1999
Grant date	Feb 5, 2002
Priority date	—
Expiry date	May 13, 2019

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/52
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The present invention provides a roller bit for tunnel-driving machines. Pursuant to the invention, a cutting ring has at least two or more segments. Accordingly, it is possible to renew the cutting ring itself or different parts of the cutting ring segment by segment, without the previously required dismantling and installation of a complete roller bit from a drill head and associated expenses of transporting. A total driving time is thus reduced because of shorter repair times. The segments of the cutting ring are disposed in a fixed position preferably by means of profiled guides on the base roller body and connected with the base roller body by means of segment holding devices which have a screw thread, and/or by means of threaded rings.

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