Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1979-03-12
1980-11-18
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51106LG, 5116587, 5116588, B24B 914
Patent
active
042337844
ABSTRACT:
An apparatus for edging the periphery of an ophthalmic lens to a predetermined outline or edge configuration, is characterized by a work holder for supporting and rotating a lens while moving an edge of the lens against a grinding surface of a grinding wheel. During grinding the lens is engaged with only a portion of the surface, and to prevent a groove from being formed in the surface a sensor automatically detects the highest point on the surface and controls movement of the work holder to move the lens thereagainst. In consequence, the wheel wears evenly, it retains a substantially cylindrical shape, all portions of its grinding surface are effectively used in grinding lenses, and formation of a groove in its surface is prevented, whereby the wheel does not require retruing or reshaping and its useful life is significantly increased.
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patent: 3835591 (1974-09-01), Cimprich
patent: 3992826 (1976-11-01), Nakaoka et al.
patent: 4020601 (1977-05-01), Gray
patent: 4176498 (1979-12-01), Vulich et al.
Adolphson K. Bradford
AIT Industries, Inc.
Whitehead Harold D.
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