PIPE CONNECTING DEVICE

WIPO Patent Application WO/2014/181592

A1

A pipe connecting device of the type using an inner ring is provided which, by reviewing once again the structure, has been improved so as to allow more repeated use than conventionally possible even while maintaining good seal performance. This pipe connecting device is provided with an inner ring (3) which has an outer peripheral part (3G) provided on the tip with a tapered outer peripheral expanded surface (3a) which expands a tube end (4C), a pipe fitting main body (1) which has a cylindrical screw portion (1A) with an attached male screw (7), and a union nut (2) which has a female screw (13). The inner ring (3) expands the tube end (4C) and is inserted into the cylindrical screw portion (1A), and the tapered outer peripheral expanded surface (3a) is pressed by the union nut (2) which is engaged and screwed onto the cylindrical screw portion (1A), the tapered outer peripheral expanded surface (3a) and the union nut (2) holding the tube (4) from both sides, wherein the tube pressing portion (12b) of the union nut (2) which presses the tube (4) between the tapered outer peripheral expanded surface (3a) is formed as an inclined inner peripheral surface which, relative to the axis (Y) of the cylindrical screw portion (1A), is inclined in the same direction as the outer peripheral expanded surface (3a).

FUJII MAKOTO (JP)
IIDA TOSHIHIDE (JP)

PCT/JP2014/058004

November 13, 2014

March 24, 2014

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NIPPON PILLAR PACKING (JP)

F16L33/22

WO2000028254A1

2000-05-18

JPH03168495A	1991-07-22
JPH1054489A	1998-02-24
JPH11257572A	1999-09-21
GB1277718A	1972-06-14
JPS5284014U	1977-06-23
JPH0614674U	1994-02-25
JPH05240386A	1993-09-17
JPS50109214U	1975-09-06
JPH1054489A	1998-02-24

See also references of EP 2995839A4

SUZUE Shoji (JP)
Shoji Suzue (JP)

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