US Patent 7178916 Three-piece combinative device with eyeglasses and attachment sunglasses

A three-piece combinative device with eyeglasses and attachment sunglasses includes a primary eyeglasses having a pair of rimmed lenses, a pair of temples and a bridge including a horizontal slot in the center, a fork like fastener having a tongue on central inner side inserted into the horizontal slot and a pair of prongs opposite to the tongue each including a magnet embedded in the distal portion, the attachment sunglasses having a pair of rimmed darkglasses, a bridge, a fork like projection projected inward from a central inner side of the bridge attached on the top of the bridge of the eyeglasses and a pair prongs each including a corresponding magnet embedded in the distal portion respectively engaged with and attracted by the pair of magnets of the fastener by which the attachment sunglasses is firmly attached to the original eyeglasses.