Apparatus for injection molding lenses

Details Apparatus for injection molding lenses Apparatus for injection molding lenses

1975-08-22

1977-02-15

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Dough divider type including trap chamber

Rotating trap chamber pickup

425327, 425352, 425808, 264 1, 4254501, B29D 1100

Patent

active

040080315

ABSTRACT:
Apparatus for injection molding thermoplastic lenses, such as prescription eyeglass lenses, in a single injection molding operation into a finished single vision or multifocal blank which does not require additional molding or polishing. Movable optical inserts (dies) are forced apart by injected polycarbonate, then the inserts are urged together forcing a portion of the injected polycarbonate into a pocket.

REFERENCES:
patent: 2166215 (1939-07-01), Lloyd
patent: 2233057 (1941-02-01), Luce
patent: 2319014 (1943-05-01), Smith
patent: 2333131 (1943-11-01), Tillyer et al.
patent: 2516373 (1950-07-01), Ehlert et al.
patent: 2532501 (1950-12-01), Johnson

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