Resources Contact Us Home
Apparatus for creating a concave surface from a spectacle blank

Image Number 6 for United States Patent #6227952.

A method for creation of a surface from a rough blank for spectacles is which is suitable for both brittle-hard materials and for plastics uses makes use of a disk-shaped, rotation-symmetrical tool of relatively large diameter, by means of which the material to be taken off the rough blank is removed with high grinding or milling efficiency in at least two work steps--a plunge-cut step and a shaping step with material removed along a spiral path. The outcome of the last work step is a machining path traveling in a spiral from the outside to the inside with low residual apex height and relatively large apex spacing. The resulting surface needs only slight fine-grinding and polishing aftertreatment. As an option, both a rim machining step adapted to the form of the eyeglass frame and a work step faceting the rim of the eyeglasses can be integrated into the method. Furthermore, tools are proposed for carrying out the grinding and milling process.

  Recently Added Patents
Veronica plant named `Amethyst Plume`
Hepatitis C virus inhibitors
Magnetic resonance imaging apparatus
Motor assembly
Atmospheric treater with roller confined discharge chamber
Base station device and wireless communication method
Method of making a CIG target by cold spraying
  Randomly Featured Patents
Snack food mold
Burr hole cover for cranial surgery
FM transmitter
Method of using an etchant solution for removing a thin metallic layer
Membrane-type inflation nozzle
Application assistance
Heat-gelling and foam-stabilizing enzymatically modified vegetable isolates
Meter for measuring mass flow rate
Bubble detecting apparatus for medical infusion device
Solid inks incorporating a polyhydroxyalkanoate compound for enhanced properties