Resinous pipe joint

摘要

A resin pipe joint has: a synthetic resin-made joint body including an inner cylinder portion and an external thread portion; and a synthetic resin-made union nut including: an internal thread portion; a seal peripheral edge which is actable on a tip-end portion of a tube flared portion; a slipping-off prevention peripheral edge which is actable on a large-diameter portion of the flaring changing region; and a pressing inner peripheral portion which is externally fittable to a flared straight portion that is fitted to a straight barrel cylinder portion.

主权项

1. A resin pipe joint wherein said resin pipe joint has:
a synthetic resin-made joint body including an inner cylinder portion to which an end portion of a synthetic resin-made tube is externally fittable and attachable while being flared, and an external thread portion; and a synthetic resin-made union nut including: an internal thread portion which is screwable with said external thread portion; a seal pressing portion which is actable on a small-diameter portion of a flaring changing region in a flared portion of said tube, said flared portion being externally fitted to said inner cylinder portion; a slipping-off prevention pressing portion which is actable on a large-diameter portion of said flaring changing region; and a pressing inner peripheral portion which is externally fittable to a flared straight portion of said flared portion, said flared straight portion surrounding a constant-diameter straight barrel cylinder portion, and said resin pipe joint is set so that, by a screw advancement of said union nut in a direction of an axis of sad joint body, the screw advancement being caused by screwing said internal thread portion to said external thread portion in a state where said tube is externally fitted and attached to said inner cylinder portion and said flared portion is formed, said pressing inner peripheral portion is externally fitted to said flared straight portion, a portion of said large-diameter portion of said flaring changing region is pressed in the direction of the axis by said slipping-off prevention pressing portion, a diameter of said portion being larger than a diameter of said inner cylinder portion, and said small-diameter portion of said flaring changing region is pressed in the direction of the axis by said seal pressing portion, and a pressing face is formed on the slipping-off prevention pressing portion, an inner diameter of the pressing face is formed to be larger than a maximum diameter of an outer peripheral face of the inner cylinder portion and smaller than a diameter of an inner peripheral face of the pressing inner peripheral portion, the pressing face being perpendicular to the axis.