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US 5,345,725 AGranted
Variable pitch lapping block for polishing lenses
OwnerFrank H. Anthonyinventor
Life of this patent
Estimating the term…
Abstract
A variable pitch lapping block for use in polishing a range of prescription lenses having different radii of curvatures is obtained by the use of an element made of rubber or the like, which is associated with a pressurized chamber, wherein the element exhibits a range of curvatures depending upon the variation of the pressure in the chamber.
Claims15
A variable pitch lapping block for use in polishing optical lenses in an apparatus for polishing lenses having any one of a plurality of radii of curvatures, said lapping block comprising:
- a rigid lapping block body element having a top portion structured for attachment to said apparatus and outer side walls extending downward and away from said top portion for forming an upper portion of a chamber,
- a resiliently elastic element having edges and a radius of curvature between the edges, said edges being attached at said side walls to form a closure for said chamber, and
- a valve element extending through a side wall of said rigid lapping block body element and communicating with said chamber for admitting pressurized fluid into said chamber for changing the radius of curvature of said resilient elastic element to conform to a selected one of said plurality of radii of curvatures of said lenses.
Dependencies are inferred from the claim text.