Lens blocking and constant center thickness system

Details Lens blocking and constant center thickness system Lens blocking and constant center thickness system

1993-10-21

1996-02-27

Rachuba, Maurina T.

Abrading

Work holder

451390, B24B 13005

Patent

active

054944740

ABSTRACT:
A blocking system for supporting a lens blank having a first cut, posterior surface for a contact lens or an intraocular lens and a reference surface includes a block having a forward extension with a cylindrical side wall and front surface complementary to the posterior surface of the lens blank. A disposable, annular collar of synthetic resin surrounds the cylindrical extension. The top edge of the collar abuts the reference surface of the lens blank and serves to determine the location of the posterior surface during cutting the front surface of the lens. The shaped and/or the cylindrical extension may be separable from the blocking member such as a plastic cap having a shank frictionally received in a cavity in the front surface of the blocking member or a plastic cap adhered to the end of the cylindrical extension.

REFERENCES:
patent: 4239712 (1980-12-01), Neefe
patent: 4619082 (1986-10-01), Dent et al.
patent: 4653234 (1987-03-01), Lombard
patent: 4856234 (1989-08-01), Goins
patent: 5291692 (1994-03-01), Takahashi et al.

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