Process for the production of a mould for moulding a spectacle frame front
US4161060A · kind A · utility
13Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1977 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | Dec 1, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49989
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.