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US 4,300,317 AGranted
Method of fitting ophthalmic lenses in spectacles frames
AssigneeAmerican Optical Corporation
InventorsGeorge T. Croft, Rato R. Buhler
Life of this patent
Estimating the term…
Abstract
Glazing spectacles frames with correction of attending lens rim distortions by measuring the inner perimeter of the rims and edging the lenses to the measured perimetric size and proper pattern shape. Insertion of the edge lenses into the measured lens rims will cause the rims to conform to the edged lens profile and correct preexistent rim distortions.
Claims7
The method of fitting an ophthalmic lens in a rim of a spectacles frame comprising the steps of:
- measuring the perimeter of the inner edge of a said rim;
- selecting an edging machine pattern having a profile accurately corresponding to an intended final contour of said inner perimeter of said rim and operatively adapting said pattern to apparatus for edging said lens;
- adjusting said apparatus according to the relative perimetric sizes of said pattern and said measured inner perimeter of said rim, said adjustment being such as to effect edging of said lens to said inner perimetric size of said rim by grinding operation of said apparatus when said lens is operatively clamped in said apparatus;
- clamping said lens in said apparatus and effecting said grinding operating;
- removing said lens from said apparatus;
- and
- inserting said lens into said rim, causing said rim to assume the configuration of said edged lens profile.
4 more elements
Dependencies are inferred from the claim text.