| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fusion inner which has high versatility and enables to form a branch saddle joint causing no problem after fusion. <P>SOLUTION: A fusion inner 10 is integrally formed on the rear surface of the saddle (102) of a branch saddle joint (100), and includes an inner body 12 and a heating wire 14 fixed on the surface of the inner body 12. A through-hole 16 is formed in the center of the inner body 12, and a plurality of projections 18 are spirally formed around the through-hole. The heating wire 14 is hooked on the projection 18 and spirally wound, and is disposed in a long elliptic ring shape in the axial direction of the inner body 12, and a heating wire 14 is added in an ivy form to the inside of the major axis-direction end of the ring part 14a of the heating wire. A margin region S short in the peripheral direction of the inner body 12 and long in the axial direction of the inner body 12 is formed between the through-hole 16 and the heating wire 14. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
