Process and apparatus for the production of spectacle frame parts of synthetic material
US4265850A · kind A · utility
11Cited by
17References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1978 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Jul 10, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/059
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to the production of spectacle frame parts of synthetic material and in particular to the moulding of spectacle frame faces of synthetic material, for example, of polyurethane. The faces are moulded between two casting half-moulds each comprising a plate having an impression on one surface thereof. Each plate has a substantially equal thickness at every point and is made of a polyolefine. Use of such half-moulds enables the faces of spectacle frames to be directly moulded into their final shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.