Process for the production of a mould for moulding a spectacle f

Details Process for the production of a mould for moulding a spectacle f Process for the production of a mould for moulding a spectacle f

1977-12-01

1979-07-17

Lanham, C. W.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

295276, 29 20, 264273, 264274, 249 95, 425127, 425129R, 264219, 264220, 264226, 264271, 264275, B22D 11126, B21D 3300, B29C 102, B29N 900

Patent

active

041610601

ABSTRACT:
Two metallic half-moulds are produced from a prototype. The half-moulds have complementary mould faces which abut when the mould is closed, and moulding surfaces formed with annular rim depressions joined by a bridge cavity, each rim depression bordering a support surface for a false lens. A webbed frame front is moulded, false lenses are cut from that moulded front, and the mould faces which abut are set-back by a total amount corresponding to the shrinkage of the false lenses, so that the false lenses are gripped between the support surfaces and shape lens bezels in the rims when a frame front is moulded.

REFERENCES:
patent: 1461071 (1923-07-01), Schumacher
patent: 3406232 (1968-10-01), Barker

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