Joint construction for cable piping

一种用于电缆管线的连接结构，设置有由一个薄壁管组成的内圆筒(1)和一个自由滑动地配装在内圆筒(1)上的外圆筒(2)，从而将用于电缆的第一管(3)和用于电缆的第二管(4)连接起来以在长度上扩展和收缩。紧紧地配装于第一管(3)的一端的周向面31上的第一密封件(9)的保持环(5)，挂接于第一管(3)的一端的周向面(31)的板式的第一止动环(6)，以及一个开口端成形件(17)，三者通过塑性加工一起配装于内圆筒(1)的一端(11)。配装于第二管(4)的一端的周向面(41)上的第二密封件(14)的保持槽(13)通过对内圆筒(1)的另一端的塑性加工而形成。一个挂接于第二管(4)的一端的周向面(41)的第二止动环(7)，和一个开口端成形件(18)，两者通过塑性加工一起配装于外圆筒(2)的外端。 A joint construction for cable piping provided with an inner cylinder of thin wall pipe and an outer cylinder fitted on the inner cylinder so as to freely slide to connect a first pipe for cable to a second pipe for cable so as to freely expand and contract in length. 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 end portion of the first pipe, and an opening end forming member, are unitedly fit by plastic working of an end of the inner cylinder. A holding groove of a second seal member, fit to a peripheral face of an end portion of the second pipe, is formed by plastic work of another end of the inner cylinder. A second stop ring, hitching on the peripheral face of the end portion of the second pipe, and an opening end forming member are unitedly fit by plastic work on an outer end side of the outer cylinder.