| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a tip head which prevents a large resistance from being generated even in a curved pipe part whose radius of curvature is small by a method wherein a swing mechanism is interposed between a mounting part to a wire-passing rod at the tip head and a head body. SOLUTION: At a tip head 2, a swing mechanism 5 is interposed between a mounting part 7 to a wire-passing rod 1 pushed into a cable-laid conduit and a head body 8 to be used as a guide inside the conduit. Consequently, the tip head 2 can be turned arbitrarily while the part of the swing mechanism 5 is used as a fulcrum with reference to the axial direciton of the wire-passing rod as indicated by a broken line. In this manner, when the wire-passing rod 1 connected to the tip head 2 is pushed into the conduit 4 via the swing mechanism 5 so as to pass the curved pipe part of the conduit 4, the tip head 2 changes its direction easily by following the bend of the curved pipe part even when the tip head 2 comes into contact with the inner wall of the curved pipe, and the tip head is advanced without being subjected to a large resistance from the inner wall of the conduit 4. Consequently, the wire-passing rod 1 can be pushed by a slight force.</p> |
