The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2002
Filed:
May. 13, 1999
Klaus Dieter Sauer, Petersberg, DE;
Guenter Fennel, Burghaun, DE;
Ernst Heiderich, Hohenroda, DE;
Bernd Ries, Huenfeld, DE;
Reinhold Walter, Rosdorf, DE;
Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik, Burghaum, DE;
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.