| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a run-off fold from being projected into an inner pipe when a hose is bent while high flexibility is kept. SOLUTION: A flexible tubular wall thickness part 2a of an inner pipe 2 is swollen outwardly in the radial direction of a hose, and formed in a spiral corrugation shape. A corrugated part located outside in the bending direction of the flexible tubular wall thickness part 2a when bent is expanded approximately straight, and the corrugated part located inside in the opposite bending direction absorbs the compressive stress to form a run-off fold 2b to be projected outside in the radial direction of the hose.</p> |
