(under subclass 91) Subject matter wherein the lenses are retained within the mounting as by spring tension members, resilient clamping rims, hinged clasps or by hinged frame-portions acting as enclosures for the lens without the use of rivets, screws or other more conventional fastening devices, thereby making the lenses readily removable and interchangeable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for connectors with clamping arms.
106, for screwless lens mountings in brace arm or semirimless spectacles.
