| 摘要 |
<p>The flap (3) is fixed angularly relative to at least one funicular elastic element (4) of which the ends extend towards the outside of this flap to pass at least partly through the ring (2) in order to pivot there, the free ends of the element (4) being anchored relative to the ring (2) in such a way as to constitute two torsion bars returning the flap (3) to its original position after it has been displaced. …<IMAGE>… </p> |
