| 摘要 |
In an apparatus and method for deterring and preventing forced entry intrusion into residential and commercial premises, the apparatus is a combination vertically operated dead bolt door lock surrounded by an alarm housing having battery means, a loud speaker, and a contact switch. The lock striker plate is mounted to the door frame as usual, but the lock is not mounted to the door at all, but rather is attached in suspension within the alarm housing. The alarm housing is attached to the door, and the lock within the housing is offset so as to float in spaced-apart relationship from the door on which the alarm housing is installed. Upon an intrusion effort, the door, together with the alarm housing will be shoved inward toward the premises by the intruder. But the lock floating within the alarm housing will be restrained by its engagement with the striker plate mounted to the door frame. Because the lock is restrained from moving but the alarm housing is not, there will be relative movement therebetween, restrained only by resilient spring washers upon the screws mounting the lock to the alarm housing. When the resilience of the spring washers is overcome by the force applied by the intruder, there will be motion of the lock relative to the alarm housing, in turn causing an electrical alarm contact switch to activate a piercing alarm sound, and causing the intruder to be deterred from continuing to try to force entry to the premises.
|
