Lens blocking apparatus

Details Lens blocking apparatus Lens blocking apparatus

1989-12-08

1991-04-09

Parker, Roscoe V.

Metal founding

Means to shape metallic material

Including means to hold or position preformed product part...

51216LP, 425808, 269 7, 269 58, B22D 1900

Patent

active

050056336

ABSTRACT:
A blocking mechanism comprises a similified rotary dial mechanism and a l clamp which automatically depressurizes a molten alloy tank in response to a release of the lens clamp pressure. A lens seat is provided with a raised resilient pad to accommodate the recessed portion of a bifocal lens. The application of final lens clamping pressure cannot occur until the lens clamp contacts the lens in order to assure that an operator's finger cannot become accidentally pinched.

REFERENCES:
patent: 3468366 (1969-09-01), Suddarth
patent: 3866667 (1975-02-01), Knight
patent: 3946982 (1976-03-01), Culkins et al.
patent: 3951203 (1976-04-01), Prunier

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