Patent ID: 7846364

Claim:
A method for manufacturing a composite product having a first molded part and a second molded part, the second molded part being supported by the first molded part through a supporting shaft, the method comprising: providing a molding die having a first cavity for molding the first molded part and an independently formed second cavity for molding the second molded part; disposing a first portion of the supporting shaft in the first cavity and a second portion of the supporting shaft in the second cavity; introducing a molding material from an injection-molding machine into the first cavity through plural first passages connecting the injection-molding machine with the first cavity; introducing the molding material in the first cavity into the second cavity through plural second passages connecting the first cavity with the second cavity at a position separate and apart from said first portion of the supporting shaft; solidifying the molding material introduced into the first cavity and the second cavity; and removing solidified first and second molded parts from the first and the second cavities, wherein the second molded part is disposed within the first molded part which has a cylindrical shape, the first cavity includes a cylindrical body molding portion, the second cavity is provided on a center axis of the cylindrical body molding portion, the molding material is introduced into the first cavity through plural first passages which are symmetrically formed with respect to a center axis of the cylindrical body molding portion, and the molding material in the first cavity is introduced into the second cavity through plural second passages which are symmetrically formed with respect to a center axis of the supporting shaft.