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
Elegant solutions for fingerprint image enhancement
Carbonyl-ene functionalized polyolefins
Repeating frame battery with joining of cell tabs via welded-on male and female slip-fit connectors
Encoding method and encoding device, decoding method and decoding device and transcoding method and transcoder for multi-object audio signals
Push to release cover for a portable electronic device
Preservation of liquid foods
Method for using extended security system, extended security system and devices
  Randomly Featured Patents
Mulcher attachment for cultivator
Lithographic apparatus and device manufacturing method
Preventive/remedies for liver diseases
Composition for chemical mechanical planarization of copper, tantalum and tantalum nitride
Light guide for a telephone dial
Carrying structure for portable electronic devices
Pipe joint construction
Cast, heat-resistant austenitic stainless steels having reduced alloying element content
Inflation device with storage chamber
Color filters for liquid crystal display panels and method of producing the same