Drill rod coupling

US6513840B1 · kind B1 · utility

Assignee

• Mannesmann AG · DE

Inventors

• Gerhard Krug · Duisburg, DE
• Erich Quadflieg · Krefeld, DE

Key dates

• Filing date: Dec 18, 2000
• Grant date: Feb 4, 2003
• Expiry date: Dec 18, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16L15/001
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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 th…