| 摘要 |
PROBLEM TO BE SOLVED: To improve the stiffness of a blade by forming a reinforcing rib integrally on a blade body or (and) a cover body making a hollow blade. SOLUTION: A propeller fan made of a cylindrical boss 1 and a plurality of blades 2, 2 protrudingly provided on the periphery of the boss 1, is composed of a fan semi-molding body 6 made from a integrally molded article of synthetic resin including the boss 1 and a blade body 3 making one surface side of the blade 2, and a cover plate 4 made of the synthetic resin joined to the blade body 3 through a hollow part 5. Reinforcing ribs (e.g. intersecting ribs 9, 10) projecting toward each other are integrally formed on the blade body 3 or (and) the cover plate 4 to improve the stiffness of the blade 2.
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