| 摘要 |
PROBLEM TO BE SOLVED: To mold an antenna cover in the shape of a slender bag to have a uniform wall thickness. SOLUTION: Slender cantilever core bars 21a, 21b with one end of each of them fixed are arranged in the antenna cover molding spaces 27a, 27b of a die. Moving pins 26a, 26b are inserted movably into pin insertion holes 21c, 21d formed at the tips of the other ends of the core bars 21a, 21b. When an injected molding material reaches an applied pressure return part 26c installed in a core bar fixing pin 26, the material is moved by its pressure, and the moving pins 26a, 26b are extracted from the insertion holes 21c, 21d. The material is almost packed in the spaces 27a, 27b, and the decentering of the core bars 21a, 21b can be prevented.
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