| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a U-shaped gutter with different right and left side wall thicknesses as well as different right and left side wall heights and bottom part thicknesses merely by a single molding device. SOLUTION: Side wall attachments 12A and 12B with different thicknesses are installed detachably on at least one of a pair of right and left side frames 3A and 3B. The side wall attachments 12A and 12B are separable in vertical direction, and connected so that the surfaces 12a and 12b of these separable side wall attachments 12A and 12B are flush with each other, and adjusting members with different heights are installed replaceably on a base part.
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