Patent ID: 7475917
Filing Date: 2009-01-13
Classification: F16L

Abstract:
1. A threaded connection for a conduit, comprising: a pin member comprising a pin thread having a pin thread crest, a pin thread root, a pin load flank oriented at a pin load flank angle, and a pin stab flank oriented at a pin stab flank angle; a box member comprising a box thread having a box thread crest, a box thread root, a box load flank oriented at a box load flank angle, and a box stab flank oriented at a box stab flank angle; wherein at least one of the pin load flank angle, the pin stab flank angle, the box load flank angle, and the box stab flank angle varies at a substantially constant rate over at least part of the threaded connection; wherein the at least one of the pin load flank angle, the pin stab flank angle, the box load flank angle, and the box stab flank angle varies at the substantially constant rate between and including about 0.5 degrees per pitch and about 3 degrees per pitch.