Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1986-01-06
1987-05-12
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Changing mold size or shape during molding or with shrinkage...
2642978, 425447, 425555, 425588, 425808, B29D 1100
Patent
active
046648542
ABSTRACT:
Method and apparatus for molding a plurality of lenses of thermoplastic resin of different optical power and/or mass that comprises a plurality of molding stations, each including a rigidly supported male mold and a female mold allowed to float freely within defined limits. At each molding station, a wedge-shaped slide member whose position is controlled by a hydraulic piston is movable an independent distance over the female mold between a home position allowing maximum free floating and an operative position independent for each slide member to transfer a compression force onto an injected body of molten resin at said station. The hydraulic pistons are actuated from a common manifold to allow equal compression pressure at each molding station after the slide members move their independent distances.
REFERENCES:
patent: 4091057 (1978-05-01), Weber
patent: 4184835 (1980-01-01), Talbot
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4372740 (1983-02-01), Kuramochi et al.
patent: 4540534 (1985-09-01), Grendol
patent: 4569807 (1986-02-01), Boudet
Lowe James
Neolens, Inc.
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