| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an expansion bellows type duct which has excellent tight attachment of a reinforcing coil to a band-shaped member, can hold the form at the time of contraction, generates less dangling at elongation, is light in weight, allows easy cutting, and may be thrown without any significant problem. SOLUTION: A duct 1 is composed of a reinforcing resin coil 2 in spiral shape and a duct wall 5 formed by overlapping a band-shaped member of resin and winding along the spiral of the coil. One end 26 on the side alongside the longitudinal direction of the band-shaped member enwraps the reinforcing coil 2 and sealed in tight attachment to the band-shaped member and the other end of the band-shaped member enwraps the adjacent reinforcing coil 2.</p> |
