download barcode scanner for java mobile FIGURE 11-1 McKinney two knuckle door hinge in Software

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FIGURE 11-1 McKinney two knuckle door hinge
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to take place Hinges are made of two steel plates held together by a hinge pin To hang the door one hinge plate is mounted on the door frame and the other hinge plate is mounted on the door Figure 11-1 shows a hinge
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As discussed in 7 there are several types of door alarm switches used to detect an intruder The list below is the types of door contact switches used to detect intruders For details about how they work see 7 1 Mechanical contact switches 2 Magnetic switches 3 Balanced magnetic switches The door contact switches are usually used in conjunction with another intrusion technology such as motion sensors The reason for using dual technologies when planning and installing intrusion detection is to make sure that there is a backup if one system fails to detect the intruder For example, the intruder may be able to defeat the door contact switches but the motion sensors will detect the intruder as they move past the compromised door and contact switch Another sensor to use with the door contact switch is some type of pressure switch usually in the a mat concealed on the floor just inside the door so the intruder compromises the door switch and door the pressure switch will detect the intrusion Wall vibration sensors are sometimes used to detect the vibrations caused by someone forcing the door for entry The vibration may caused by the tools used to spread the frame or pop the lock
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Other security measures that can be taken to enhance the security of a door include the use of hinge pins or welded hinges to prevent easy removable of the exposed hinge pins Hinges are considered adequate for security based on the materials of construction and their size A larger hinge affords more protection since it requires more mass that must be bent or removed before entry is gained by forcing the hinge Steel is the strongest of the materials that hinges are made from and is the preferred material for security There are several other factors to be considered for increasing the security of hinges: 1 The hinge should be located on the inside of the door rather than on the exterior where is vulnerable to being removed to gain entry 2 How the hinge plates are anchored to the frame and the door To increase security the hinge plates should be secured to the frame and the door using
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machine screws and in some cases the hinge can be welded to the door frame providing additional security 3 Exposed exterior hinges should be pinned or spot welded to prevent easy removal Non-removable hinge pins can also be used for exterior hinges The nonremovable hinge pin is held in place with a set screw that is screwed through the hinge plate and can only be removed when the door is opened Another option is the safety stud which is a projection or stud that is built into one plate of the hinge an when the door is closed the safety stud fits into a cavity in the other hinge plate Even the hinge pin is removed the stud will hold the door in place Finally there is what is known as a fast riveted pin The fast riveted pin is actually a pin that is longer than the hinge plates and is flattened so the pin is wider than the pin hole and cannot be removed without cutting the pin It is better to have the hinge pins on the inside of the door rather on the outside where they are vulnerable to attack and compromise Pinning the hinges prevents separation of the two hinge plates which will allow for removing the door from the frame Spot welding the hinges to prevent the removal of the hinge pin is another method to secure exterior facing hinges So the hinge pin plates need to be securely fastened to the door frame Toe fastened the hinge plates to the door frame use steel hinges and machine screws which provide more strength than steel screws Also a long screw can be inserted into the hinge plate and fastened to the door frame and then cut the head of the screw off to prevent easy removal
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