| 摘要 |
PURPOSE:To aim at improvements in strength and durability, by making a welding line longer, while checking and dispersing the concentration of stress to a welding line zone in an effective manner. CONSTITUTION:In this metal belt, a welding line L is formed long on a spiral path on a circumferential surface of a belt body B. With this constitution, an operating stress is no longer concentrated on the welding line L, thus a breaking accident during operation is preventable from occurring. |
