| 摘要 |
PROBLEM TO BE SOLVED: To surely carry out watertight connection of a corrugated tube by annularly arranging a current-carrying heating element on an inner circumferential surface of an inserting inlet of a pipe coupling, and protruding a positioning protrusion for inhibiting drawing of the corrugated tube to be inserted, on the inner circumferential surface of the inserting inlet. SOLUTION: In a thermoplastic resin made corrugated tube coupling 1 for watertight connecting a corrugated tube, an annular stopper part 11 is formed on a center of an axial direction thereof, and cylindrical parts of both sides of thereof are formed as inserting inlets 12 of the corrugated tube. Each inserting inlet 12 has nearly the same inner diameter as an outer diameter of a crest part of the corrugated tube, and each belt shaped current-carrying heating element 3 is embedded inside an annular rib part which is formed on the way of each inserting inlet 12 and which is swollen on an outer periphery along all circumference. A wedge shaped positioning protrude 13 is protruded inside at a clearance of 120 deg. of a circumferential direction, on an inner circumferential surface of an opening end side from the current-carrying heating element 3 of each inserting inlet 2, and thereby, drawing of the corrugated tube to be inserted is obstructed.
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