Propeller fan construction

摘要

A propeller fan construction is provided in which the impeller thereof includes a spider member having a plurality of symmetrically arranged planar marginal portions, and a plurality of blades projecting outwardly from the spider member. Each blade has an inner end provided with a planar segment which is fixedly mounted on a planar marginal portion of the spider member. The spider member and each of the blades are formed of sheet material. Each blade is provided with an elongated embossment extending from one elongated edge of the blade in an angular direction relative to the longitudinal axis of the blade. The embossment is position between the outer end of the blade and the planar segment of the inner end.