Combination of split bodies for use in assembling blower fan by hollow article molding process

A combination of split bodies for use in assembling a synthetic resin blower fan by a hollow article molding process, said split bodies comprising:

• a first split body and a second split body assembled on top of said first split body, said first split body including a circular base portion and a plurality of vanes extending radially, said second split body being a doughnut-shaped cap with an air inlet at the center thereof, radial blast-air channels being formed between adjacent pair of said vanes,
• said second split body including a plurality of grooves which are formed on an inner surface opposite from said first split body in an assembled state and each of which extends radially along an edge of a corresponding vane, each of said groove being adapted to be closed by said edge so as to define a flow path for allowing a molten synthetic resin to pass therethrough, and said second split body further including an injection hole being in fluid communication with an upstream end of said flow path with respect to the flow direction of the molten synthetic resin to be injected so as to allow the molten synthetic resin to be injected into said flow path therethrough, and a gas vent hole being in fluid communication with the downstream end of said flow path with respect to said flow direction.