Types of Locks and Keys in Visual Studio .NET

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Types of Locks and Keys
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Figure 3.22 Domestic automobile key blanks. (Star Key and Lock Co.)
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Figure 3.23 Sampling of common foreign automobile key blanks. (Star Key and Lock Co.)
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The cross-reference listing is available from your key blank representative, or you can spend between $20 and $50 to get a complete cross-reference book. This is both an advantage and a disadvantage. With the full book, you may have to look in a number of sections whereas with the smaller, individual cross-reference breakout from your key distributor/manufacturer, you are more likely to find the required key quickly.
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Types of Locks and Keys
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Figure 3.24 Key comparison chart for automotive and residential key blanks. (Star Key and Lock Co.)
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A copy of a cross-reference listing is a prime requisite for every shop. Remember, your priority is the listing obtained from your key manufacturer; you can get the book later if you find you need it. Neuter Bows Because most nonlocksmiths can only identify key blanks by their bows, locksmiths often use neuter (or security) bow key blanks to make keys harder to duplicate. Such bows have a generic shape and style and provide no
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Figure 3.25 Neuter bow key blanks can be used for advertising purposes. (Kustom Key, Inc.)
information that identifies a lockmaker. That prevents unauthorized people who may have a key for a short time from running to any hardware or department store and getting the key copied. In addition to increasing security, such bows provide space to imprint advertising, increasing the likelihood that the customer will return to the same locksmith to get duplicate keys. Figure 3.25 shows some neuter bow key blanks.
Warded Locks
The warded lock is the oldest lock still commonly in use and is found in all corners of the world. It employs a single or multiple warding system. Because of its simple design, its straightforward internal structure, and its easily duplicated key, this lock is an excellent training aid for locksmiths. This same simplicity means that warded locks give very little security. Use these locks only in low-risk applications such as storage sheds and rooms where high security is not essential. At one time warded locks were used on most doors. They are still found in abundance in buildings still standing in older metropolitan neighborhoods such as Center City Philadelphia, Market Street in San Francisco, the Old Town section of Chicago, and the East Side of New York City. The oldest of these buildings have cast-iron locks on the doors, some of which date back to the last century. Later locks were made of medium-gauge sheet metal. The casing consists of two stampings: the cover plate and the back plate. The latter mounts the internal mechanism and forms the sides. The warded lock derives its name from the word ward, meaning to guard. The interior of the lock case has protruding ridges or wards that help protect against the use of an unauthorized or improperly cut key. Normally there are two interior wards positioned directly across from each other on the inside of the cover and backing plates. This lock is sometimes mistakenly referred to as a skeleton-key lock. The proper and full name is the warded-bit key lock. Types Two types of warded locks are currently in use: the surface-mounted (or rim) lock and the mortised lock (Fig. 4.1). While both types are similar in structure and size, they give a varying degree of security. The internal mechanisms of both operate on the same principle, but the mortise lock may have several additional parts. Differences between these locks are as follows:
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Figure 4.1 Bit key locks are available in mortised (left) and surface-mounted styles. (Taylor Lock Co.)
Surface-mounted (rim) lock Mounted on door surface Secured by screws in the door face Door can be any thickness Thin case Short latchbolt throw Lock from either side Strike can be removed with door closed Very restricted range of key Very weak security
Mortised ward lock Mounted inside of door Secured by screws in the side of the door at the lock face plate Door must be thick enough to accommodate Fairly thick case Up to 1-inch latchbolt throw Locked from either side Strike cannot be removed with door closed Restricted range of key changes Weak security
Construction The basic interior mechanism is drawn in Fig. 4.2. Since the relative security of any lock lies in the type of key used, the number of key variations possible, and the amount of access to the locking mechanism afforded by the keyhole, the warded lock is the least secure. The keyhole is an access route to the interior mechanism of the lock. The larger the keyhole, the easier it is to insert a pick or other tool and release the bolt. If a lock was designed to have no more than 10 different key patterns (changes) and 1000 locks were made, 10 different keys would open all 1000 locks. By the same token, one key would open the lock it was sold with and about 99 others. Furthermore, it is often possible to cut away parts of a key to pass (negotiate) the wards of all 1000 locks. You can see that lock security is related to the kind and number of key changes built into the system when it is initially designed.
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