Casting gasket assembly and method for casting lenses therefrom
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United States of America Patent
Stats
-
Jun 11, 1985
Grant Date -
N/A
app pub date -
Apr 11, 1980
filing date -
May 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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