Wedge demolding of cast lens mold assemblies

Details Wedge demolding of cast lens mold assemblies Wedge demolding of cast lens mold assemblies

1996-04-01

1997-12-02

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 136, 264101, 264334, 4251744, 4254517, 425808, B29D 1100

Patent

active

056932685

ABSTRACT:
Demolding apparatus for reliably and repeatedly mechanically separating contact lens mold assemblies without damaging the contact lens formed therebetween. The mold assembly includes a frontcurve mold having a central mold section with a surrounding flange, and a corresponding backcurve mold also having a central mold section with a surrounding flange, with a contact lens being molded therebetween. A support pallet is provided for supporting the mold assembly. A wedge separating fixture provides at least one separating wedge positioned between the spaced flanges of the mold assembly, and the wedge separating fixture and support pallet are translated relative to each other to progressively separate the frontcurve mold from the backcurve mold. In one embodiment the wedge separating fixture is stationarily mounted suspended above the support pallet, and a drive conveys the support pallet relative to the stationarily mounted wedge separating fixture to a position whereat the separating wedge is positioned between the spaced flanges of the mold assembly and separates or demolds the frontcurve and backcurve molds.

REFERENCES:
patent: 2365764 (1944-12-01), Kastner
patent: 3851038 (1974-11-01), Meyer
patent: 4535689 (1985-08-01), Putkowski
patent: 4786444 (1988-11-01), Hwang
patent: 5137441 (1992-08-01), Fogarty
patent: 5160749 (1992-11-01), Fogarty
patent: 5358672 (1994-10-01), Blum
patent: 5417557 (1995-05-01), Ross et al.
patent: 5560941 (1996-10-01), Hegler et al.

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