Threaded connection with improved root thread profile
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United States of America Patent
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Jun 28, 2016
Grant Date -
Jul 3, 2014
app pub date -
Jan 17, 2014
filing date -
Dec 9, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A threaded connection design having a double ellipse in the thread root for reducing stress fatigue is illustrated in this disclosure. The root groove includes a first portion comprising a first elliptical surface being part of a first ellipse. The root groove further includes a second portion comprising a second elliptical surface, being part of a second ellipse, and the second elliptical surface being joined tangentially at a first end to the first elliptical surface at a junction point that defines the bottom of the root groove. The second elliptical surface is joined tangentially at a second end to the load flank.
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