| 摘要 |
PROBLEM TO BE SOLVED: To improve the rigidity of an element without using a hard resin pipe. SOLUTION: An upper element 2a and a lower element 2b are constituted of one wire rope. Since the wire rope has rigidity and flexibility, appropriate rigidity and flexibility can be given to the elements without using a hard resin pipe. Thus, a trip fixing part is integrally formed at the tip of the upper element 2a and an intermediate fixing part 5 at a middle part. Then, the upper element 2a and the lower element 2b are fitted by bending them.
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