| 摘要 |
PURPOSE:To inexpensively manufacture the strong and effective driving part with a parting prevention in one stage by forming the tip of the flat part of the tip side having the cross section different from the base end part of the supporting lever of a gutter bracket metal in a pyramidal shape with a die press and forming a parting prevention projection as well. CONSTITUTION:In the supporting lever 11 working of a gutter bracket metal the flat part 11b of the tip side of the cross section different from that of the base end side is inputted to dies 21, 22 and the tip is stamped in pyramidal shape. In this case, the recessed parts 25, 26 with slope for parting prevention are fitted to the pyramidal die 23 of the dies 21, 22 to form simultaneously a falling-out prevention part 19 in the shape of projection and a tapering tip part 11a. The production cost is made inexpensive by forming the pyramidal part with parting prevention without cutting the material fiber nor causing excess metals in one stage. The flat part 11b of the supporting lever 11 becoming the driving aim may be stamped at the same time.
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