Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Changing mold size or shape during molding or with shrinkage...
Patent
1980-04-11
1985-06-11
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...
249 53R, 249 82, 249102, 249134, 249154, 425808, B29D 1100
Patent
active
045227683
ABSTRACT:
A gasket assembly for casting optical lenses includes a first gasket member having a cylindrical opening therethrough and an annular flange extending radially inwardly in the cylindrical opening. One surface of the flange is adapted to receive a casting lens die, and may be disposed in a plane not perpendicular to the axis of the cylindrical opening. A second gasket member is adapted to be received in the first gasket member, and includes an inwardly extending annular flange having one surface adapted to mate with the flange of the first gasket member. The other side of the annular flange of the second gasket member includes a shaped surface adapted to receive a lens casting die having the capability of conferring on the cast lens any combination of power and cylinder characteristics, the shaped surface being configured to mate and seal with the peripheral area of the compound surface of the die. The gasket members may be mated together with the second gasket member rotatable in its mating arrangement with the first, so that a limited number of casting dies and gasket members may be used to cast lenses of any combination of sphere power, cylinder power, prism, and any other desired ophthalmic characteristics.
REFERENCES:
patent: 2728106 (1955-12-01), Herman et al.
patent: 3056166 (1962-10-01), Weinberg
patent: 3222432 (1965-12-01), Grandperret
patent: 3946982 (1976-03-01), Calking et al.
patent: 4190621 (1980-02-01), Greshes
patent: 4257988 (1981-03-01), Matos et al.
Ewer Ronald W.
Roscrow Harold N.
Squires Philip H.
Cohen Howard
Lowe James
Sola Products Limited
Zimmerman Harris
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