Spectacle lenses exchange construction - has lockable adjusting screws on nose bridge, to retain frame around lenses

摘要

A spectacle frame which allows interchanging of different lenses, has a horizontal bridge section divided in two which may be opened or closed to interchange lenses. The plastics spectacle frame (1) has a nose bridge (2) separated in the horizontal plane in two parts (3). Lockable adjusting screws (4) enable the bridge part to be separated for exchange. The adjusting screws consist of bushes, a screw spindle and a bin.