Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se
Patent
1990-11-30
1992-05-05
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
249 58, 249144, 249159, 249176, 264 21, 264 25, 264 27, 425180, 425577, 425808, B29C 4533
Patent
active
051102781
ABSTRACT:
Injection molding methods and apparatus for the production of casting molds for toric lenses having ballast oriented properly with respect to the cylinder axis of the toric surfaces. A calibrated rotatable ring mechanism is used within the injection molding body, for producing a slot or other alignment means on the lens casting mold at a point which is offset a predetermined number of degrees from the axis of the toric surfaces being formed in the casting mold. When the casting mold containing a newly cast lens is mounted on a precision lathe, the mating of the slot with a permanent ridge on the lathe spud ensures that the mold seats on the lathe at the same established place each time with respect to the position of the cutting tool. The offset between the toric axis and the position of the cutting tool has already been established, and therefore there is no need for the lathe operator to make any measurements or resetting of the cutting tool.
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Bruker Izi
Tait John S.
Barber Frank T.
Cates Charles E.
Heitbrink Tim
Pilkington Visioncare Inc.
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