Patent ID: 6352407
Filing Date: 2002-03-05
Classification: F04D

Abstract:
A method of constructing a blade assembly for a fan apparatus, wherein the blade assembly includes a hub, a single blade, and a counterweight, the method comprising the steps of:providing a mold including a hub cavity, a blade cavity protruding from the hub cavity in a first direction, and a counterweight-body cavity protruding radially from the hub in a second direction opposite the first direction, the cavities being in communication with one another so that the blade assembly can be formed of a unitary molded piece of synthetic resin material; fitting a removable first mold insert in the blade cavity, the first mold insert filling a portion of the blade cavity remote from the hub cavity; and injecting a synthetic resin material into the mold with the first mold insert in place to form a blade assembly having a blade with a dimension in the first direction that is shorter than the dimension of the blade in the first direction would be if the synthetic resin material was injected into the mold with the first mold insert removed.