US Patent 7517207 Injection molding device

An injection molding device (100) includes an upper mold (30), a core insert (50), and a lower mold (70). The upper mold defines a main flow passage (311) and a cylindrical receiving cavity (331) communicating with the main flow passage. The core insert is rotatably received in the cylindrical receiving cavity and defines a secondary flow passage (57) communicating with the main flow passage and at least one upper half molding cavity (531). The lower mold defines at least one lower half molding cavity (711) cooperating with the upper half molding cavity to form a full molding cavity.