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

Image Number 2 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
Incentive based recommendation method for mobile station content
Apparatus and method for transmitting and receiving data
TC-83-derived alphavirus vectors, particles and methods
Analog to digital converter with increased sub-range resolution
Particulate filter with hydrogen sulphide block function
Method for producing cathode active material for a lithium secondary battery
  Randomly Featured Patents
Exterior automotive laminate with pressure-sensitive adhesive
Method for removing chromium ions from aqueous solutions of organic acids
Bone anchoring device
Vehicle bumper assembly and associated vehicle comprising this bumper assembly
Regeneration of active carbon and polymeric adsorbents
Pressure reducing valve
Method and apparatus for determination of food quality and authenticity
Making organic thin film transistor array panels
Composition for preventing adhesion of damp earth on metal surfaces
Sample rate converter