| 摘要 |
<p>The security door is for protection against vandalism and has the following features: &cirf& the panel (5) has, on one side (9) parallel to that near the axis (4), an edge (10) folded towards the outside forming a locking tongue which can be engaged behind the frame (2), &cirf& the frame (2) has, perpendicular to the axis, an inside measurement slightly greater than that corresponding to the panel increased by the width of the tongue, &cirf& and the means for locking is formed by a mechanism (11) controlling the translational motion of the panel (5) with respect to the axis (4) and perpendicular to it over a distance equal to the useful length of the openings. Application to letter boxes. <IMAGE></p> |
