Hitachi Metals, Ltd.

Tokyo Gas Company Limited

Sankoh Co., Ltd.

Tamaki Hamaguchi

Tomoyuki Minami

Fumitaka Satoh

Minoru Fujiyoshi

Takaaki Inotani

Youichi Uchiumi

Takuji Okiayu

Akihiro Hattori

Fumikazu Ishibe

Masahiro Mohri

Satoru Araki

The formation of a resin layer, a metal layer and an insulating resin layer on an outer surface of a corrugated metal pipe for flowing a fluid provides a flexible pipe, whose corrugated metal pipe does not suffer from having apertures even with spark discharge by induced lightning.

Flexible pipe

A pipe joint comprising a pressing nut into which a flexible pipe is inserted, a joint body into which the pressing nut is partially inserted, a resilient means unlocked when pushed by a tip end of the flexible pipe, a sealing member, a retainer engaging the flexible pipe, and an engaging mechanism keeping the pressing nut at a predetermined position in the joint body; the engaging mechanism comprising a stop ring, an annular groove formed on an outer surface of the pressing nut for receiving the stop ring, pluralities of engaging grooves formed on an inner surface of the joint body for receiving the stop ring and communicating with each other; the stop ring engaging both of the annular groove and the first engaging groove before the connection of the flexible pipe is completed; and when the flexible pipe is pulled after completing the connection, the stop ring moving from the first engaging groove to the second engaging groove to draw the pressing nut from the joint body, so that the normal connection of the flexible pipe can be confirmed.

Pipe joint

Growing community of inventors

Tokyo, Japan

Tamaki Hamaguchi