Pipe of hard thermoplastic resin, pipe joint structure and methods of manufacturing the same

摘要

A pneumatic joint(1)comprising a pipe body (2) of a hard thermoplastic resin, and an open ring (3) of a hard thermoplastic resin fitted in the pipe body from one opening thereof; the open ring being provided with a slip-off preventing projection (13) on an outer circumferential surface of a fitted portion thereof; the pipe body (2) being provided with an annular seal (9) of an elastic resin formed firmly on an inner circumferential surface thereof, a fitting inlet-carrying pipe (7) of a hard rigid resin disposed so as to coaxially abut on one side portion of the pipe body (2) and having a recess (10), with which the slip-off preventing projection (13) of the open ring (3) is engaged, in an inner circumferential surface of the abutted portion thereof, and an annular connecting portion (8) of a hard synthetic resin molded on an outer circumferential surface of the abutted portion of the inlet pipe firmly, and adapted to connect the fitting inlet-carrying pipe (7) to the pipe body (2).