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. 04, 2003
Filed:
Dec. 18, 2000
Gerhard Krug, Duisburg, DE;
Erich Quadflieg, Krefeld, DE;
Mannesmann AG, Düsseldorf, DE;
Abstract
A boring rod connector with a journal element that has a tapered external thread section located between an outer shoulder and a journal face, a thread-free section located between the outer shoulder and the external thread section, and a thread-free section located between the external thread section and the journal face, and with a sleeve element that can be screwed to the journal element and has a tapered internal thread section located between an inner shoulder and a sleeve face, a thread-free section located between the inner shoulder and the internal thread section, and a thread-free section located between the internal thread section and the sleeve face. The thread-free sections of the journal element and the sleeve element located in the area of the inner shoulder that, when a screw connected exists, lie opposite to each other, have a different length than the thread-free sections of the journal element and the sleeve element located in the region of the inner shoulder. The inner shoulder forms the primary shoulder and, after the drill pipe connector is assembled and screwed to up to 90% of its yield point, the journal face tightens on the inner shoulder up to a pressure that exceeds the pressure exerted by the sleeve face on the outer shoulder, whereby the sleeve face tightens mainly on the outer shoulder when an additional torque occurs during boring. The thread-free sections located in the region of the inner shoulder are at least twice as long as the thread-free sections located in the region of the outer shoulder.