Tokyo Gas Company Limited

Hitachi Metals, Ltd.

Sanko Gas Seiki, Ltd.

Morio Saito

Shinichi Kanomata

Toshio Saito

Fumitaka Satoh

Tetsuya Wada

Minoru Fujiyoshi

Yasushi Kosugi

Keizou Ohkawa

Takashi Anamizu

Michio Hasegawa

A pipe joint for connecting a flexible corrugated tube includes a joint body, a sleeve received in an axial through bore in the joint body for holding a free end of the flexible corrugated tube, and a nut threadedly fitted in a threaded portion of the joint body. A shoulder is formed on an inner surface of the through bore, and has an air-tight surface directed toward one end of the through bore. A tapering surface, decreasing in diameter progressively toward the shoulder, is formed on the inner surface of the through bore in adjacent relation to the shoulder. An annular groove of a generally channel-shaped cross-section is formed in the inner surface of the through bore in adjacent relation to the tapering surface. The sleeve has projections extending radially inwardly from one end thereof facing said shoulder, the sleeve having an end surface at the other end thereof. The projections are pivotally movable resiliently relative to the remainder of the sleeve so as to be received in a predetermined one of valleys in the outer peripheral surface of the corrugated tube. The nut has a holding portion for holding outer surfaces of the projections of the sleeve in registry with the annular groove. The nut has a flange surface for abutment against the end surface of the sleeve.

Pipe joint for connection of corrugated tube

A coupling for a corrugated pipe having ridges and grooves arranged alternately is disclosed. A body of this coupling has a through-hole whose one end is served as an inlet port. An annular accommodation recess and an annular retainer portion are formed on an inner periphery of the through-hole in this order toward the inlet port. A cylindrical support member is accommodated within the body. The support member is urged toward the inlet port by a spring. One end portion of the support member on the inlet port side is served as a receiving portion. An annular engagement member is mounted on an outer periphery of this receiving portion in such a manner as to be elastically enlarged in diameter. When the support member is pushed in a direction away from the inlet port against the spring by a distal end of the corrugated pipe inserted from the inlet port, the engagement member is disengaged from the receiving portion of the support member and reduced in diameter so as to be brought into engagement with an outer periphery of one of the grooves of the corrugated pipe. That part of the corrugated pipe, which projects from outer peripheries of the ridges of the corrugated pipe is retained by the retainer portion of the body while the engagement member is in engagement with the outer peripheries of the grooves.

Coupling for corrugated pipe

Growing community of inventors

Tokyo, Japan

Morio Saito