Lens blocking apparatus
US5005633A · kind A · utility
12Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1989 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Dec 8, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A blocking mechanism comprises a similified rotary dial mechanism and a l clamp which automatically depressurizes a molten alloy tank in response to a release of the lens clamp pressure. A lens seat is provided with a raised resilient pad to accommodate the recessed portion of a bifocal lens. The application of final lens clamping pressure cannot occur until the lens clamp contacts the lens in order to assure that an operator's finger cannot become accidentally pinched.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.