download barcode scanner for java mobile Copyright 2006 by The McGraw-Hill Companies, Inc Click here for terms of use in Software

Creation PDF417 in Software Copyright 2006 by The McGraw-Hill Companies, Inc Click here for terms of use

Copyright 2006 by The McGraw-Hill Companies, Inc Click here for terms of use
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of defense in security The quality and strength of the lock the potential thief encounters will send the message that this is a hardened target or a soft target If the effort was made to install a good security lock then probably here are other security devices that have been installed as well such as an intrusion detection system so the potential thief may think twice and will move on to a softer target to attack Since locks are extension of the door or window into the wall the lock is only as good as the wall around it If the wall is weak the lock will be bypassed by attacking the wall to gain entry In this chapter the types of locks and their uses will be presented Also a look at some new innovations in locks that offer keyless entry Keyless locks are gaining in popularity since they are no keys to lose or carry Keyless entry has increased in recent years as in vehicle entry; some are even offering keyless ignition This use of keyless entry locks has and will continue to affect residence locking systems and in fact there are locks on the market today that offer keyless entry
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TYPES OF LOCKS
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There are different types of locks on the market today These range from deadbolts to electric strikes to keypad and combinations locks Some locks offer more security than others and require considerable time and expertise to open and other locks can be opened more easily without any special knowledge Dead bolts are the most popular lock for residential use All locks are operated by either a key, electronically using an access card, or numerical combination by entering pin numbers into a keypad to gain access To enhance the use of locks they are usually used in conjunction with another security device such as an intrusion detection system The primary part of a lock is the latch or bolt and most key-operated locks use it except for combination and padlock locks There are various types of locks and below are the most widely used locks: 1 Cylindrical locks are also known as key-in-knob or key-in-lever locks Normally these locks are used to secure, offices, storage rooms, etc The cylinder in the center of the doorknob identifies these locks Some of the cylinder locks have a key way in both sides of the lock to unlock or lock the lock These are used in a door that has a window above the doorknob and the potential exists that if the glass is broken, entry can be made by reaching in and turning the thumb turn or handle to open the door Some cylindrical locks are also installed with lever handles with the cylinder in the center The cylindrical lock has a cylinder or plug that is the key way The grooves in the key are there so when the key is inserted into the lock they line up with the configuration of the pins in the plug The pins cause the rotation of the plug as the key is turned moving the latch from the strike plate
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FIGURE 10-1 A picture of a cylindrical lock made by Sargent Locks, Inc
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The cylindrical lock is good for low security locations and applications The lock is easily compromised by either removing the doorknob or lever or prying the latch from the strike plate Figure 10-1 is a picture of a cylindrical lock made by Sargent Locks, Inc 2 The dead bolt lock is also known as a tubular dead bolt The lock is mounted on the door in a similar fashion to the cylindrical lock except that there is a bolt that slides into the strike plate When locked the bolt extends into the frame at a minimum of 1 inch to prevent easy forcing of the lock out of the frame The dead bolt lock is used on apartment doors, house doors, etc The lock provides more protection than the cylindrical lock To prevent unlocking the lock by breaking a window, it is recommended that dead bolt locks that are placed in doors with windows or next to windows have a double key cylinder which means that a key is needed to lock or unlock the lock on either side of the door Deadbolt locks are used for residential and office security and provide an acceptable level of security The lock can be defeated by prying the bolt back from the frame freeing the bolt from the strike plate This is why a minimum of a one-inch throw on the bolt is important since it cannot be forced back by prying the bolt The frame can be forced open by spreading the door frame using an old automobile jack The jack is placed in between the door frame and is extended until the frame forces the bolt to open Another way to defeat the deadbolt is to find a weak point to enter, like a window Figure 10-2 is a typical deadbolt lock 4 The mortise lock gets its name from the way that the lock case is mortised recessed into the edge of the door The mortise lock that has a doorknob on the both sides of the door is the most common one There is an exterior thumb latch on entrance doors rather than a doorknob on some models To lock the lock there is a thumb turn or button The button is usually in the
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