| 摘要 |
The seal (5) has sealing rings (7, 8) comprising hinge portions (10, 17, 18) extending along longitudinal direction (Z) in vicinity of support portions (6, 22, 25) and main portions (9, 15, 16, 19), which extend along the longitudinal direction. The main portions are connected to the support portions via the hinge portions. The hinge portions have bending flexibility higher than that of the main portions. The hinge portions has gutter-shaped parts (11) having concave and convex faces. The gutter-shaped parts include a section whose shape is selected from circular arc and/or spiral. An independent claim is also included for an opening section comprising a rib having bending lines. |
