Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer
Patent
1994-09-28
1996-02-27
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Composite or multiple layer
264571, 264246, 264247, 264275, 264279, 425127, 4251291, 425808, B29D 1100
Patent
active
054946158
ABSTRACT:
A method for manufacturing eyeglasses includes the steps of: forming a lens unit; providing a mold unit which includes first and second mold halves, the first mold half having a support surface which conforms to a rear surface of the lens unit and a first frame defining surface which extends around a portion of the support surface, the second mold half having a complementary surface which conforms to a front surface of the lens unit and which defines a lens receiving space with the support surface, and a second frame defining surface which extends around a portion of the complementary surface and which defines a frame forming cavity with the first frame defining surface, the first mold half being formed with an air passage having a first open end which opens at the support surface; placing the lens unit fittingly in the lens receiving space such that a first positioning unit formed on the rear surface engages a second positioning unit formed on the support surface; activating a vacuum pump connected operably to a second end of the air passage to draw air out of the air passage when the lens unit is received in the lens receiving space; and feeding a measured quantity of molten material into the frame forming cavity via a material flow passage formed in the first mold half to form integrally the frame unit on a periphery of the lens unit.
REFERENCES:
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patent: 3247550 (1966-04-01), Haines, Jr.
patent: 3406232 (1968-10-01), Barker
patent: 3531869 (1970-10-01), Hays et al.
patent: 3621544 (1971-11-01), Petitto
patent: 4161060 (1979-07-01), Lenne et al.
patent: 4170616 (1979-10-01), Jebens
patent: 4383673 (1983-05-01), Laprade et al.
patent: 5275764 (1994-01-01), Hettinga
patent: 5413743 (1995-05-01), Prophet
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