G - Physics
02
C
G02C 9/00 (2006.01) G02C 5/00 (2006.01) G02C 5/14 (2006.01) G02C 5/22 (2006.01) G02C 9/04 (2006.01)
Patent
CA 2363059
An eyeglass device includes a auxiliary spectacle frame and a primary frame having two extension with bulged locking face formed in the sides. The primary frame includes two half-free locks with a straight arm and a annular arm turning around the screw at bulge-shaped locking surface at the extension of the primary frame. The auxiliary spectacle frame includes two locking bolt engaged on the half-free locks fixed by the locking bolt of the temples on the primary spectacle frame so as to prevent the auxiliary spectacle frame from moving downward relative to the primary spectacle frame under vibration.
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