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:
Oct. 22, 1991
Filed:
Apr. 27, 1990
Applicant:
Inventors:
Carl S Hartwig, Taby, SE;
Ove V Nilsson, Orebro, SE;
Assignee:
Atlas Copco Construction and Mining Technique AB, Stockholm, SE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175339 ; 299 81 ;
Abstract
Rock working tool for a tunnel boring machine. The tool comprises a shaft (34) with a central hole (35). A tool part (8,9) is rotatably journalled on the shaft. The tool is cooled through the arrangement of channels (40,41,42) in the tool for conducting cooling liquid from a pressure liquid source (22) to the central hole and via the channel (42) which flushes directly on the tool part (8,9).