| 摘要 |
PURPOSE:To enhance following-up property and recovering property of a joint part of beads at the time of cooling and heating and enhance sealing performance, by gradually reducing the bead width as the joint part is approached so that the restricted parts are provided at the joint part. CONSTITUTION:The bead width is gradually reduced as an intersecting point 14 (the joint part) of the beads is approached, whereby the restricted parts 17 are provided at included angle parts 16. Accordingly, the included angle parts 16 are prevented from undergoing complicated deformation due to overlapping of the deformations, and seal lines 18 are prevented from being cut at a part in proximity to the intersecting point 14. |
