| 摘要 |
<p>A slider (30) is interposed between a shaped element (9) and a frontal wall (12) of a coupling element (2) and is designed to allow the sliding of the shaped element on the frontal wall. As result it causes the progressive increase of the arm of the antagonistic force in consequence of the passage from a closing condition (C), in which the support element (3) is faced to the frontal wall, to a condition of extreme opening (A), in which the axle of the support element is almost orthogonal to the frontal wall.</p> |
