| 摘要 |
PROBLEM TO BE SOLVED: To provide a plug-in joint for corrugated pipes by which the correct connection work can be easily confirmed. SOLUTION: The plug-in joint 1 for corrugated pipes is provided with an indicator means 70 for notifying a worker that a corrugated pipe has been inserted deeply into an inner hole of a joint body 10, and that it has abutted on a far end face 26 of a step 27. In the indicator means 70, when the corrugated pipe (a flexible pipe) abuts on the far end face 26, a metal wire 74 conducted to a negative electrode of a battery 72, the flexible pipe abutting with the metal wire 74, the far end face 26 of the step 27 abutting on an end face of the flexible pipe, a retainer presser 50 fixed by a screw to the joint body 10, a conducting wire 76 electrically connected to the retainer presser 50 and one electrode of a bulb 73, and a conducting wire 75 connected to another electrode of the bulb 73 and a positive electrode of the battery 72 are electrically connected to form a closed circuit, and a very weak current is sent through to light a bulb 73. COPYRIGHT: (C)2009,JPO&INPIT
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