| 摘要 |
Each filtering lens (2) is mounted in a profiled ring (9), in the form of a U on its side, the opening of which is directed towards the centre of the ring. This ring (9) is fitted into an outer ring (8) connected to the spectacle frame. A manoeuvring device comprising a moulded member (17) is housed inside the ring (9) in a notch (undercut) (2a) made at the periphery of the filtering lens (2). The outer ring (8) has a semicircular groove (24) to allow the angular movement of a positioning rod (21) rigidly attached to a piston (20) mounted so as to slide in a housing (18) against the action of a spring (19). One end of the rod (21) is rigidly attached to a gripping member (22) whereas the other end is intended to be engaged in positioning openings (23) made through one arm of the outer annular profile (8). <IMAGE>
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