| 摘要 |
<p>A protection latch mechanism for mortise cylindrical locks, comprising a supporting screw (14), secured between the front wall (15) of the lock and the lock's cylinder (12). The supporting screw (14) is preliminarly weakened; for instance it is shorter than regular screws. Blocking means connect the weakened supporting screw (14) to the main latch (11) of the lock. The blocking means comprise a sprung sliding plate (17), engaged onto the supporting screw (14) and engageable to the latch of the lock. When the intruder manipulates the lock's cylinder, trying to brake it (thus resulting in a change of the cylinder's position), the weakened supporting screw will not resist this action and thus rotate and change its position. That will activate the blocking means to secure and block the main latch of the lock. <IMAGE></p> |
