Screwed pipe joint

US5048871A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Gerd Pfeiffer · Poughquag, US
• Erich Quadflieg · Krefeld, DE
• Friedrich Lenze · Ratingen, DE
• Gerhard Krug · Duisburg, DE
• Josef Siekmeyer · Ratingen, DE

Key dates

• Filing date: Jul 27, 1989
• Grant date: Sep 17, 1991
• Expiry date: Jul 27, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S285/913
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A screwed pipe joint with a bell for connecting two pipes of a drill pipe string. The screwed pipe joint includes, in opposed relation, a first pipe having a first tapered threaded end (10) and a second pipe having a second tapered threaded end (11), the first tapered pipe end and the second tapered pipe end having a different taper and pitch, and being shaped so that when the pipes are joined they are form-locked and having an axial clearance (23, 23') therebetween; and a bell having a first and second threaded section (7, 8) complementary to and for engagement with the first and second threaded pipe ends, and an unthreaded section (9) therebetween and a radially inward projecting shoulder (24) on the unthreaded section (9) of the bell (6) opposite the first pipe (2); the first and second pipe ends having respective annular recesses (14, 13) therein defining, with the unthreaded bell section (9), an annular space (15) therebetween; a sealing sleeve within the annular space (15) having an outside diameter smaller than the inside diameter of the unthreaded section (9) of the bell (6) and being axially fixed in the recess (14) of the first pipe end.