| 摘要 |
A guard plate is used to protect a door from forced entry where the door is used in conjunction with a doorjamb. The door has a lock cylinder in it, and this cylinder is operatively interconnected with a reciprocal bolt for entering an opening in the doorjamb in a conventional manner. The guard plate has first and second interconnected sections. An opening is provided through the first section for accommodating the portion of the lock cylinder which normally is exposed on the surface of the door in which the cylinder is mounted. The first section of the plate then is secured to the door, with the lock cylinder aligned with the opening in the first section. The second section also has an opening through it, and the two sections are interconnected together with a bridge. The bridge causes the second section of the plate to overlie the doorjamb when the door is closed, and the bridge itself overlies the space between the door and the doorjamb when the door is in its closed position. An auxiliary securing device is mounted in the opening in the second section, and this device releasably secures the second section to the doorjamb independently of operation of the lock cylinder. When the second section is secured to the doorjamb, by the auxiliary securing means, the door cannot be opened, irrespective of the condition of operation of the reciprocal bolt.
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