| 摘要 |
PURPOSE:To improve the external appearance in the neighborhood of the mounting parts of respective rotatable blades by a method wherein a housing having a plurality of pairs of bosses, each of which has a circular section equipped with a shaft hole so as to pierce wall parts, on both wall parts opposing to each other is molded primarily and a plurality of blades, at both ends of each of which projecting parts having respective pivot shaft with the same outer diameter as that of the boss are equipped, are molded secondarily. CONSTITUTION:A housing 3 is molded with a first and a second opening and closing molds 34 and 35 and a pair of sliding molds 36 so as to be equipped with a plurality of pairs of bosses 11, each of which has a circular section equipped with a shaft hole 10 piercing the opposing wall surfaces 9 of a peripheral wall. On the mating surface of the first opening and closing mold 34, recessed parts 44, each of which has a semi-circular section and both the ends of each of which form the corresponding regions of the bosses 11, are provided so as to fit to the damming projections 48 on the mating surface of the second opening and closing mold 35. After molding and mold opening, by using the mold 34, onto which a molded article is left, a third opening and closing mold 52 and sliding molds 53 and 54, a plurality of blades 5 are molded. At both the ends of each blade main body 4, pivot shafts 15 rotatably fitting to the shaft hole 10 are equipped on the projecting part 14 having the same outer diameter as the boss 11. In this case, the pivot shaft is molded by utilizing the shaft hole 10 as a cavity.
|
