Patent ID: 7025392

Claim:
A joint construction for cable piping provided with an inner cylinder having an inner cylinder main body of thin-wall pipe and an outer cylinder fitted to the inner cylinder so as to freely slide, and having an outer cylinder main body of thin-wall pipe to connect a first pipe for cable and a second pipe for cable so as to expand and contract in length, comprising: a holding ring of a first seal member tightly fit to a peripheral face of an end portion of the first pipe, a first stop ring of plate hitching to the peripheral face of the first pipe, and an opening end forming member, all of which are unitedly attached to an end of the inner cylinder by plastic working on the inner cylinder main body; a holding groove of a second seal member tightly fit to a peripheral face of an end portion of the second pipe formed to be curved by plastic working on another end of the inner cylinder main body; and a second stop ring hitching to a peripheral face of the second pipe and an opening end forming member which are unitedly attached to an outer end of the outer cylinder by plastic working on an outer end of the outer cylinder main body.