US 4,685,781 A · Spectacles with fastening device

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.

Claims28

Dependent claims

A fastening device for connecting a spectacle lens having a borehole with an enlarged seat at each end thereof to an individual component in the form of a bridge, a flange or a temple articulation piece of a spectacle frame, said fastening device comprising a pin adapted to extend through the borehole, a connecting element on one end of the pin adapted to rest in one of the seats at one of the two borehole ends, a lock for preventing the individual component from rotating around the axis of the pin relative to the lens;

said pin being connectable at its other end to a shank portion of the individual component arranged to extend approximately parallel to the lens;
a first protrusion on said shank arranged to extend toward the lens and adapted to rest in the second borehole seat for clamping the lens between said connecting element and said first protrusion on the shank and said lock further having means on the individual component adapted to engage with the edge of the lens near said borehole at locations spaced from one another in the peripheral direction of the lens and being situated on opposite sides of a point on the lens edge located closest to the borehole.

Dependencies are inferred from the claim text.

Spectacles with fastening device

Life of this patent

Spectacles with fastening device

Life of this patent

Abstract

Claims28