| 摘要 |
<p>The case has a closing element (1) for closing an opening, where the element is connected to middle (2) by an elastic metal unit (3) that is in a form of a ring or endless loop. The elastic metal unit has a recessed cross-section defined by a profile of a non-rectilinear wall. The profile defines an annular fold having an orientation parallel to the plane of the opening, where the fold is formed by a curvature. An arc of the curvature defines an angle between greater than 90 and 180 degrees, so as to impart a freedom of movement, relative to the plane of the opening, to the closing unit.</p> |
