PLEATED WIND BAG

PURPOSE: To prevent the release of a connection part by providing a flat ring groove using at least one joint wheel region as a tightening mechanism on an outer side and providing a basic bottom part in contact with the tightening mechanism to widen a width more than a ring rising part provided on an inner side. CONSTITUTION: This tare with pleats 1 has a first joint wheel region 2 and a second joint wheel region 3 and has flat peripheral grooves 4, 5 and inner ring rising parts 6, 7, two ring clearances 8, 9 are prepared in the grove 4 and the rising part 7 is arranged in individual deep ring clearance 10 in the groove 5. The groove 4 has a width (a), the inner rising part 6 having a width (b) and a groove (c) in the radial direction exists in the width, and the clearances 8 9 are arranged in a region of the rising part 6. Both of these clearances 8, 9 have extremely small widths (d), (e) for the width (a) of the groove 4 and relatively large depth (f), and this depth coincides with a thickness of the joint wheel region 2 in the transverse direction of the groove 6. Consequently, the inner rising parts have slightly larger widths than corresponding grooves in a joint structure part and can seal stably in a side face region.