Threaded joint for pipe
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United States of America Patent
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Nov 24, 2015
Grant Date -
Jul 18, 2013
app pub date -
Jun 22, 2011
filing date -
Jun 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A threaded joint for a pipe is disclosed in which scalability, compression resistance, and galling resistance are enhanced. The threaded joint includes a pin nose outer peripheral surface that forms an outward convex curve in an axial cross-sectional view; the convex curve is such that a composite R curve, in which a plurality of outward convex arcs having different radiuses of curvature are connected in sequence to a generating line of a cylindrical portion next to a male member, is curved such that the radiuses of curvature increase with distance from the male member and tangents on connection points of the arcs are aligned with those of corresponding arcs connected thereto; and the inner peripheral surface of a box component facing the pin nose is a tapered surface that interferes with the pin nose outer peripheral surface when connected to a pin component.
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