Mold for fixing a metal block on one of the faces of an ophthalm

Details Mold for fixing a metal block on one of the faces of an ophthalm Mold for fixing a metal block on one of the faces of an ophthalm

1988-03-25

1989-07-04

Housel, James

Metal founding

Means to shape metallic material

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

51216LP, 51217L, 164112, 164334, 249 65, 249 83, 249109, 249155, 269 7, 269 22, 279 1D, 425808, B22D 1900

Patent

active

048441430

ABSTRACT:
The cylindrical side wall of the mold cavity (8) has an inside diameter (D) which is greater than the largest existing ophthalmic lens diameter, and a generally cylindrical membrane (25) of elastomer material is disposed concentrically inside the mold cavity so that in conjunction with the cylindrical side wall of the cavity it defines a variable volume annular chamber (31), the membrane being expansible and retractable radially under the action of a fluid which is alternatively removed from and admitted to the annular chamber.

REFERENCES:
patent: 3221378 (1965-12-01), Faas et al.
patent: 3330331 (1967-07-01), Duckwall et al.
patent: 3353307 (1967-11-01), Sarofeen
patent: 3865178 (1975-02-01), Legendre
patent: 3886696 (1975-06-01), Duckwall et al.
patent: 3951203 (1976-04-01), Prunier
patent: 4372368 (1983-02-01), Lombard
patent: 4669226 (1987-06-01), Mandler

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