Integrally molded cross-flow fan and method of making the same b

Details Integrally molded cross-flow fan and method of making the same b Integrally molded cross-flow fan and method of making the same b

1990-03-19

1992-05-19

Simmons, David A.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249145, 249176, 249184, 264318, 425DIG5, 425441, 425577, B29C 3900

Patent

active

051146576

ABSTRACT:
An integrally molded cross-flow fan has a circular array of angularly spaced, radial vanes. The cross-flow fan is molded with a molding assembly having a plurality of gap-forming molds jointly defining mold cavities for forming the vanes. A molten resin material is supplied into the mold cavities to mold the cross-flow fan. Thereafter, a first group of gap-forming molds are withdrawn radially outwardly from between the molded vanes, and after elapse of a period of time, a second group of gap-forming molds, which alternate with the gap-forming molds of the first group, are withdrawn radially outwardly from between the molded vanes. The gap-forming molds of the first group are simultaneously withdrawn radially outwardly, and after elapse of the period of time, the gap-forming molds of the second group are simultaneously withdrawn radially outwardly. Since the gap-forming molds of the first and second groups are not simultaneously withdrawn altogether, but withdrawn one after another, with a certain time lag, they can be smoothly separated from the molded vanes, and the molded vanes are prevented from being dragged or damaged by the gap-forming molds.

REFERENCES:
patent: 3189671 (1965-06-01), Babb
patent: 3787155 (1974-01-01), Zangl
patent: 4306851 (1981-12-01), Thune
patent: 4362687 (1982-12-01), Olschewski et al.

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