| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an inner core for a joint, capable of securely connecting a resin tube in a simple structure, and capable of securely preventing a connection part from being disconnected through the displacement of the ground during an earthquake, etc. <P>SOLUTION: The metal inner core is arranged on the inner periphery of a spigot of the resin tube end while the inner peripheral surface of a socket formed at a tube end is formed to be a circular arc surface with its outer peripheral side projected. The diameter of the inner core is expandedly deformed in a state of being inserted into the socket so as to expandedly deform the diameter of the spigot. The inner core is used for the joint for connecting both the tubes by pressure-contacting the outer peripheral surface of the spigot which is radially expandedly deformed and an inner peripheral surface of the socket, via an annular seal member. A projection part (annular projection 17a) pressure-contacting to the inner peripheral surface of the spigot is provided on the outer peripheral surface of the inner core 17. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
