Inner ring

Patent metadata

Field	Value
Publication number	US-10145497-B2
Application number	US-201414888138-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	May 8, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A pipe-connecting device including a resin-made tube and an inner ring. The inner ring has a flared portion and a tip-contracted outer-circumferential flared surface. The tip-contracted outer-circumferential flared surface is press-inserted into an end portion of the tube to cause the end portion of the tube to be flared and deformed. A section shape of the outer-circumferential flared surface in a direction extending along an axis of the inner ring body is formed into a convex curved surface passing through a first place, which is a maximum-diameter portion of the flared portion, a second place, which is the tip end side of the flared portion of the inner ring body, and a third place, which is between the first place and the second place, and in which a diameter is equal to an outer diameter of the tube with respect to the axis.

First claim

The invention claimed is:

1. A pipe-connecting device comprising:
a resin-made tube; and,
an inner ring in which a flared portion is formed in an outer circumferential portion of an inner ring body that is to be press-inserted into the resin-made tube, said inner ring body having a tip-contracted outer-circumferential flared surface formed in a tip end side of the flared portion, said tip-contracted outer-circumferential flared surface being press-inserted into an end portion of the resin-made tube to cause the end portion of the resin-made tube to be flared and deformed, wherein:
a section shape of the outer-circumferential flared surface in a direction extending along an axis of the inner ring body is formed into a convex curved surface passing through a first place, which is a maximum-diameter portion of the flared portion, a second place, which is the tip-end side of the flared portion of the inner ring body, and a third place, which is between the first place and the second place, and in which a diameter is equal to an outer diameter of the tube with respect to the axis, the convex curved surface being defined as an arc having a center at a location farther than the axis with respect to the outer-circumferential flared surface in a radial direction, and,
an angle α formed by a line extending tangential to the outer-circumferential flared surface in the third place and the axis is 30 to 60 degrees (30°≤α≤60°).

2. The pipe-connecting device according to claim 1 , wherein seal element portions, which are press-contacted with seal configuring portions disposed in the pipe connecting device to constitute inner seal portions, are formed in a basal-end side of the inner ring body.

Assignees

• Nippon Pillar Packing

Inventors

• Fujii Makoto
• Iida Toshihide

Classifications

• F16L47/041

  the plastic pipe end being flared either before or during the making of the connection · CPC title

• F16L2201/44

  sterile · CPC title

• F16L33/223

  the sealing surfaces being pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts · CPC title

• F16L13/147

  by radially expanding the inner part (F16L13/168 takes precedence) · CPC title

• F16L15/08

  with supplementary elements (F16L15/04 takes precedence) · CPC title