PIPE SCREW COUPLING - JFE STEEL CORP

Title:

PIPE SCREW COUPLING

Document Type and Number:

WIPO Patent Application WO/2012/002409

Kind Code:

A1

Abstract:

Disclosed is a pipe screw coupling that has increased sealing properties, compression resistance, and galling resistance. Specifically, the pin nose outer peripheral surface (30) forms a convex curve on the outside thereof in a cross section in the axial direction. Said convex curve has a curved shape wherein a compound-R curve (N) comprising a plurality of outwardly convex arcs that are connected in sequence and that have radii of curvature (R) that differ from each other at the generating line of a cylindrical section that is adjacent to a male screw section (5) is such that the radii of curvature (R) of the arcs increase with distance from the male screw section (5) and the line tangent to the connection point of an arc is the same as that of the arc connected to. The inner peripheral surface relative to the pin nose (30) of a box member (1) has a tapered surface (20) that interferes with the pin nose outer peripheral surface (30) when connecting with the pin member (3).

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JPH081275	[Title of the Invention] A pipe end covering member for mounting a pipe joint
JPS58187690	GASKET SET UP BETWEEN DEVICE USED FOR PIPE FOR CARRYING HIGH-PRESSURE FLUID AND SCREWING JOINT

Inventors:

SONOBE OSAMU (JP)
NAGAHAMA TAKUYA (JP)
YOSHIKAWA MASAKI (JP)
TAKANO JUN (JP)
KAWAI TAKAMASA (JP)
TAKAHASHI KAZUNARI (JP)

Application Number:

PCT/JP2011/064862

Publication Date:

January 05, 2012

Filing Date:

June 22, 2011

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
SONOBE OSAMU (JP)
NAGAHAMA TAKUYA (JP)
YOSHIKAWA MASAKI (JP)
TAKANO JUN (JP)
KAWAI TAKAMASA (JP)
TAKAHASHI KAZUNARI (JP)

International Classes:

F16L15/04

Domestic Patent References:

WO2009083523A1

2009-07-09

Foreign References:

JP4208192B2	2009-01-14
JP2002522713A	2002-07-23
JPS6144068Y2	1986-12-12
JP4535064B2	2010-09-01
JP4208192B2	2009-01-14
JPS6144068A	1986-03-03
JP4300187B2	2009-07-22
JP2001124253A	2001-05-11
JP2705506B2	1998-01-28

Other References: