US Patent 7152974 Detachable shelter frame for spectacles

A detachable shelter frame for detachably mounting in front of a primary spectacle having a primary bridge, wherein the detachable shelter frame includes two shelter lenses, a shelter bridge extended between two inner sides of the shelter lenses, and a mounting arrangement including at least a supporting member rearwardly extended from the shelter bridge for riding on the primary bridge so as to support the shelter lenses and a retention member rearwardly extending for applying an urging force against the primary bridge to engage with a rear side of the primary bridge when the detachable shelter frame is mounted in front of the primary spectacle so as to substantially retain the detachable shelter frame in position.