| 摘要 |
<p>The device prevents from any unintentional and/or accidental closing of doors and similar with the key inside due to the presence of a small piston (1) housed in a containing structure (2) that may be applied inside or outside a door (P), and also provided with an expansion spring (3) that determines the outward bending with respect to said structure (2) and consequently the contrast rabbet with respect to a frame (T) of door (P), which therefore may not be closed until said piston (1) doesn't return inside said structure (2) with the consequent loading of said spring (3), by means of a return lever (4), placed externally to the door, to which a similar lever (7) corresponds internally to the door, having the same purpose.</p> |
