| 摘要 |
PROBLEM TO BE SOLVED: To reduce the weight of a device, and lower the cost by previously applying an opposite curved displacement to a bolster for fastening. SOLUTION: A bolster 3 is formed of a low-rigidity plate material, and it can be temporarily curved for displacement so as to be projected to a stack 1 showed with a two-dot chain line. Namely, a fixing bar 7 is fixed to both ends of the bolster 3, and fastened by a bolt-like tensile bar 6 and a nut 8 so as to be curved. A rod 4 is fixed near both ends of the bolster 3, and drawn from the two-dot chain line 3a condition to the direction of an arrow 10, and a flat surface bolster 3 showed with a solid line can be obtained. Consequently, since the bolster 3 as a fastening plate is formed of a low-rigidity plate material, weight is reduced and cost is lowered, After the fastening, since the bolster 3 is returned to the original flat shape for the surface contact with the stack 1, load is evenly applied to the surface. |
