Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1975-10-02
1978-01-17
Smith, Al Lawrence
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51124L, 51127, B24B 914, B24B 1702
Patent
active
040684130
ABSTRACT:
An adjustable lens grinding apparatus of the type having a chuck for securing a planar lens blank thereto, an abrading cup for sweeping through the lens blank during an abrading stroke, and further including an improvement in the apparatus for positioning the chuck with respect to the abrading cup and guiding the abrading cup during the abrading stroke. The improvement includes a first member for supporting the chuck and a second member for supporting the abrading cup spaced longitudinally from said chuck. The abrading cup includes an axis of rotation centered therethrough and an annular abrading surface at the distended circumference thereof. A positioning apparatus is coupled between the first and second members for regulating the relative motion therebetween in two degrees of linear freedom and one degree of rotational freedom, with the two degrees of linear freedom defining a base plane perpendicular to the plane of the lens blank and the one degree of rotational freedom defining a first axis parallel to the plane of the lens blank. The improvement further includes a guide having a cambered surface therein and an apparatus for following the guide. The guide and the guide following apparatus are interposed between the first and the second members for guiding the sweep of the abrading cup through the lens blank during the abrading stroke. The improvement also includes an apparatus for altering the camber of the guide, whereby the sweep of the abrading cup through the lens blank during the abrading stroke may be altered to provide a plurality of different lens surfaces.
REFERENCES:
patent: 2747339 (1956-05-01), Schelling
patent: 2757487 (1956-08-01), Coburn
patent: 2806327 (1957-09-01), Coburn
patent: 3458956 (1969-08-01), Suddarth et al.
patent: 3835588 (1974-09-01), Whitham
Smith Al Lawrence
Smith James G.
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