| 摘要 |
PURPOSE: To prevent telescoping by engaging and fixing the peak parts of the waves of a corrugated band material with recessed line grooves for detaining disposed in the longitudinal direction of a flat planar band material. CONSTITUTION: The flat planar band material 1 is composed of materials having the hollow line grooves 1a, 1b,... for detention. Then, the corrugated band material 2 is composed of materials having projecting parts 2a, 2a,... for engagement which engage with the recessed line grooves 1a, 1b,... for detention of the flat planar band material 1 arranged on the upper side of the peak parts of the waves and projecting parts 2a', 2a',... for engagement which engage with the recessed line grooves 1a, 1b,... for detention of the flat planar band material 1 arranged on the lower side of the valley parts of the waves in the positions corresponding to the recessed line grooves 1a, 1b,... for detention of the flat planar band material 1 arranged on the upper and lower sides of the band material. The projecting parts 2a', 2a',... for engagement disposed at the corrugated band material 2 are easily formable at the time of corrugating the flat planar band material 1 by forming gears. The function to prevent the telescoping is efficiently and cost effectively obtd. |
