| 摘要 |
<p>PURPOSE: To provide a coupling used in a double structure pipe wherein a heat generating substance, such as a heating wire, is inserted in a feed hot water pipe or a feed water pipe. CONSTITUTION: A first joint 3 is protruded from an arbitrary surface 2 of a coupling body 2 wherein a hexahedron is formed in a hollow state. The first joint 3 is formed in a hollow cylindrical shape, the hollow part is connected to the hollow part of a coupling body 1. A heating wire lead in and out port 5 is arranged on an opposite surface to a surface 2 on which the first joint 3 is arranged and in a position to which an axis of the first joint 3 is extended. The heating wire lead in and out port 5 is formed in a shape of a cylinder having diameter lower than that of the first joint 3 and an inner pipe inserted in a feed hot water pipe or a feed water pipe connected to the first joint 3 has jut size enough to be inserted therein. Further, a second joint 6 is arranged on a surface 4 on which the heating wire lead in and out port 5 is arranged and the second joint 6 has the same shape and size as those of the first joint 3.</p> |
