Set of split bodies for forming blower fan through hollow-article injection molding process

A set of split bodies for forming a synthetic-resin blower fan through a hollow-article injection molding process, said blower fan integrally including a circular base, a doughnut-shaped cover portion having an air inlet opening at the center thereof, and a plurality of blades each extending radially between said circular base and the inner surface of said cover portion to define a plurality of radial airflow passages between said adjacent blades, said set of split bodies comprising:

• a first split body including said circular base and a plurality of blade members serving as respective substantial parts of said blades;
• and
• a second split body defining said inner surface of said cover portion and having an outer surface on the opposite side of said first split body, wherein
• said outer surface of said second split body is formed with a plurality of reservoirs each extending radially in alignment with the corresponding blade member of said first split body to define spaces to be filled with molten synthetic resin in a state where said first and second split bodies are assembled together, each of said reservoirs having a bottom wall formed with a through hole adapted to allow an upper portion of said blade member to be inserted therethrough and tightly fitted therein so that the terminal end of said blade member is exposed into the corresponding reservoir in said assembled position, while being closed by a die having a surface flush with said outer surface of said second split body and having an inlet port for injecting the molten synthetic resin and a vent hole, said reservoir being fully filled with said molten synthetic resin by injection through said inlet port.