Adjustable spectacles
US4363537A · kind A · utility
Inventor
Key dates
| Filing date | May 21, 1979 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/081
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Adjustable bifocal spectacles having at least one pair of lenses mounted in an upper frame vertically movable in relation to a lower frame so that the focal length may be changed by raising and lowering a pair of lenses in the sight line of the viewer. Means are provided for applying a pressure to the upper and lower frames either at opposite ends of the frames or at the nose support and bridge to raise or lower the upper frame in relation to the lower frame, the pressure being symmetrical with respect to the nose and bridge. Vertical movement of the lenses is accomplished by actuating a mechanism at one side or at opposite sides of the lens frame, either mounted directly to the lens frame or mounted in modified temples so that the spectacles may be adjusted without placing the hand in front of the face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.