| 摘要 |
PROBLEM TO BE SOLVED: To shorten the setup time for press molds, enhance productivity, and reduce labor cost in manufacturing round booms with different lengths each composed of a front boom structure and a rear boom structure and bent at the longitudinal center in an upwardly projecting round shape when viewed from the side. SOLUTION: The front and rear boom structures 47, 48 are formed in longitudinally symmetric shape when viewed from the side. The upper side of these structures from the longitudinal intermediate part to the longitudinal center part of the boom 12 is so formed arcuately that its upper surface is upwardly projected when viewed from the side. The upper side thereof from the longitudinal center part to the longitudinal end part of the boom 12 is linear when viewed from the side. COPYRIGHT: (C)2008,JPO&INPIT
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