Patents Assigned to Coburn Optical Industries, a Division of Pilkington Visioncare, Inc.
  • Lens blocking apparatus
    Patent number: 5005633
    Abstract: A blocking mechanism comprises a similified rotary dial mechanism and a l clamp which automatically depressurizes a molten alloy tank in response to a release of the lens clamp pressure. A lens seat is provided with a raised resilient pad to accommodate the recessed portion of a bifocal lens. The application of final lens clamping pressure cannot occur until the lens clamp contacts the lens in order to assure that an operator's finger cannot become accidentally pinched.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: April 9, 1991
    Assignee: Coburn Optical Industries, a Division of Pilkington Visioncare, Inc.
    Inventors: Herbert H. Mathews, Joseph L. Welch