Patent ID: 7727456

Claim:
A method of manufacturing a composite molded member which is mountable onto a mounting body and integrally includes: a front surface; a back surface; a projecting portion that intermittently projects from a back surface side; a first edge that faces a first portion of the mounting body when the composite molded member is mounted; a second edge that faces a second portion having a position which is different from that of the first portion; a long main body that is molded to have a hollow portion that is formed between the first and second edges and extending in a longitudinal direction, the hollow portion having an inner cross-sectional shape smaller than a distance between the first and second edges of the main body; and cushion members that are formed of an elastic polymer material, a hardness of which is lower than that of the main body, and are directly injection-molded on the first and second edges of the main body, the cushion members extending along the first and second edges in the longitudinal direction, the method of manufacturing the composite molded member comprising the steps of: setting the main body inside an injection mold, which is openable and closable to mold the cushion member, when the injection mold is opened; closing the injection mold so as to fix the main body inside the injection mold and to form molding cavities, which extend along the longitudinal direction between the main body and the injection mold for forming the cushion members, and a connecting flow path, which connects the molding cavities and is defined between the injection mold and the back surface of the main body; and integrally forming the cushion members on the fist-first and second edges of the main body through at least one of heat and pressure of the injected elastic polymer material, by injecting the elastic polymer material melted by heating from an injection gate through an injection route connected to the injection gate and connected to the connecting flow path, the injection route having one side wall including a side wall of the projecting portion beginning at the injection gate, into a range of at least one of the first and second edges at the back surface side of the main body of the molding cavities and into a position which does not reach the hollow portion so as to flow the elastic polymer material into one of the molding cavities, flowing the elastic polymer material into the other of the molding cavities through the connecting flow path, and filling the molding cavities with the elastic polymer material.