| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bellows and a bellows manufacturing method capable of not only easily manufacturing it but also shortening contraction length of the bellows to the utmost possible degree without bulging it upward in a process of contracting motion. SOLUTION: More than two sheet bodies 1, 2 the flat surface shape of which is molded into a ring shape or a square shape out of resin are continuously constituted through each of welded parts respectively alternately welded to outer peripheral edges and inner peripheral edges of the sheet bodies 1, 2, a crest part 70b is formed on the welded part of the outer peripheral edge, and a through part 70a is formed on the welded part of the inner peripheral edge.</p> |
