US 4,720,942 A · Apparatus for abrading contact lens edges

Abstract

An apparatus that abrades the edges of contact lenses. The device has a cone-shaped body portion which has an axis of rotation that coincides with the axis of symmetry of a cone. The body portion is fixedly secured to a spindle member that is engaged by a machine and rotated at high speeds. Annular grooves of differing widths and with differing radii of curvature are formed in the body portion; a polishing compound is deposited into the bottom of a groove to be used and a lens edge is introduced into the groove while the spindle and hence the body portion of the device are rotating. The angle of taper of a particular device corresponds to the dioptric power of the lens to be abraded by it. Accordingly, a cone-shaped member intended to abrade the edges of a lens of high dioptric power will have a higher degree of taper than another device intended to abrade the edges of a lens of low dioptric power.

Claims4

Dependent claims

A device for abrading the edges of a contact lens, comprising:

a generally cone-shaped member having an axis of rotation corresponding to a longitudinal axis of symmetry of the cone;
said cone-shaped member being formed of two distinct cone-shaped sections extending along said longitudinal axis with the degree of taper in the longitudinal direction of a first and second one of said cone-shaped sections being the same with an annular region of substantially greater degree of taper connecting the first and second sections;
a plurality of independent annular grooves formed in each of said cone-shaped sections at longitudinally spaced intervals along their extent;
each of said grooves having a different width for abrading contact lens edges having different thicknesses;
each of said grooves having a different concave in configuration radius of curvature at its lowermost region for abrading contact lens edges to obtain
desired radius of curvature of the lens edges.

3 more elements

Dependencies are inferred from the claim text.

Apparatus for abrading contact lens edges

Life of this patent

Apparatus for abrading contact lens edges

Life of this patent

Abstract

Claims4