Spectacles with fastening device

US4685781A · kind A · utility

Assignee

• Simro AG · CH

Inventors

• Helmut Wiedmann · Heilbronn, DE
• Gunther Czech · Radeberg, DE

Key dates

• Filing date: Nov 20, 1984
• Grant date: Aug 11, 1987
• Expiry date: Nov 20, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C1/02
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention relates to spectacles in which are spectacle lens is connected to an individual component, for example a flange, by means of a fatening device. In the spectacle lens the two ends of a borehole are expanded into two borehole widenings which are engaged with a first protrusion on the flange and with a connecting element that is connected to a pin leading to the first protrusion. In addition, the flange has two further protrusions supporting themselves on the border of the spectacle lens, so that a four-point anchoring of the flange secured by the pin against pulling and by the additional protrusions against rotating is furnished on the spectacle lens and vice versa. A certain flange is suitable for given thicknesses and curvatures of the spectacle lens, because both on the front side and the back side of the spectacle lens it is not the front or back sides that define the gripping surfaces for the connecting element and first protrusion, but the borehole widening.