Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1992-03-05
1992-12-01
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264334, 249 64, 249145, 249150, 425330, 425577, 425DIG58, B29C 3344
Patent
active
051678985
ABSTRACT:
A mold assembly for use in an injection molding process to mold a one-piece article such as a washing machine tub. The mold assembly includes first and second relatively moveable mold plates, a mold core projecting from the first mold plate, and a plurality of mold sidewall assemblies. The mold core includes an annular outer mold surface portion which tapers inwardly to provide draft to ease the removal of the molded article from the mold assembly, and which is provided with a plurality of generally teardrop-shaped projections. Each teardrop-shaped projection converges to its narrowed end in a direction opposite the direction of removal of the article from the mold core and is configured to further ease removal of the article from the mold assembly. The mold assembly also includes a plurality of core pins mounted on the mold sidewall assemblies. The core pins engage the enlarged end portions of the teardrop-shaped projections on the mold core when the mold is closed to form holes in the article, each hole being recessed in one of the teardrop-shaped depressions from the surrounding surface portion of the article.
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patent: 4520061 (1985-05-01), Stoll et al.
patent: 4526827 (1985-07-01), Stoll et al.
patent: 4588158 (1986-05-01), Mehra
Heitbrink Jill L.
Triangle Tool Corporation
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