Types of Locks and Keys in .NET

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Types of Locks and Keys
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fused if, say, a homeowner simply asked for a new house lock. The homeowner would need to be more specific. He or she would need to ask for a keyin-knob or lever lock (names based on the style of handle a lock uses) (Figs. 3.3 and 3.4). Other common house locks might include an interlocking deadlock or deadbolt lock, whose names are based on important security features (Figs. 3.5 and 3.6). While talking with one another about servicing locks, locksmiths often use names that describe a lock s installation method or internal construction, such as rim, mortise, and bored. A rim lock is any lock designed to be mounted on the surface (or rim) of a door or object. The interlocking deadbolt shown in Fig. 3.6 is one type of rim lock. A mortise lock is installed in a hollowed out (or mortised) cavity (Fig. 3.7). A bored (or bored-in) lock is installed by cross-boring two holes one for the cylinder and one for the bolt mechanism. Warded, lever tumbler, disc tumbler, and pin tumbler are names that describe a lock s internal construction.
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Figure 3.1 A trailer lock guards against towaway theft of unattended boat, camping, snowmobile, horse, mobile home, and utility trailers. (Master Lock Company)
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Figure 3.2 The U-shape design is common for bicycle locks.
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Figure 3.3 A key-in-knob lock is
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one of the most common locks used on homes. (Master Lock Company)
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Figure 3.4 A lever lock is basically a key-in-knob lock with levers rather than knobs. (Master Lock Company)
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Figure 3.5 A deadbolt lock is one of the most secure types of locks commonly found on homes. (Arrow Lock Company)
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Figure 3.6 An interlocking dead-
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bolt, or jimmyproof deadbolt, is often used on front doors of homes.
Types of Locks and Keys
Figure 3.7 Most of a mortise lock
is installed in a cavity or cutout. (Arrow Lock Company)
Figure 3.8 Warded bit key locks come in rim and mortised styles. (Taylor Lock
Company)
Figure 3.9 Warded padlocks are for
low-security applications. (Master Lock Company)
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Warded locks
A ward is a fixed projection designed to obstruct unauthorized keys from entering or operating the lock. One old type of warded lock comes in a metal case, has a large keyhole, and is operated with a bit key (commonly called a skeleton key). Such locks, called bit-key locks, come in mortised and surfacemounted styles, and are often used on closet doors and cabinets (Fig. 3.8). Some low-cost padlocks are also warded. Such a padlock can be identified by its wide, sawtoothlike keyway and keys with squared cuts (Fig. 3.9). Warded locks provide little security because wards are easy to bypass with a stiff piece of wire or thin strip of metal.
Tumbler locks
Tumblers are small objects, usually made of metal, that move within a lock cylinder in ways that obstruct a lock s operation until an authorized key or combination moves them into alignment. There are several types of tumblers; they come in a variety of shapes and sizes and move in different ways. Because tumblers generally provide more security than wards, most locks today use some type of tumbler arrangement either instead of or in addition to wards. A typical key-operated cylinder consists of a cylinder case (or housing), a plug (the part with a keyway), springs, and tumblers. The springs are positioned in a way that makes them apply pressure to the tumblers. The tumblers are positioned so that when no key is inserted, or when the wrong key is inserted, the spring pressure forces one or more of the tumblers into a position that blocks the plug from being rotated. When the proper key is inserted into the keyway, however, the key moves the tumblers to a position that frees the plug to turn. A lock can have more than one cylinder. A key-operated, single-cylinder lock has a cylinder on one side of the door only (usually the exterior side) so that no key is needed to operate it from the other side. Typically, it can be operated from the noncylinder side by pushing a button or by turning a knob, handle, or turn piece. Key-operated, double-cylinder locks require a key on both sides of a door. Many local building and fire codes restrict the use of double-cylinder locks on doors leading to the outside because the locks can make it hard for people to exit quickly during a fire or other emergency.
Types of tumbler locks. There are three basic types of tumblers: lever, disc, and pin. Most lever tumbler locks, such as those used on luggage, brief cases, private mailboxes, and lockers, offer a low level of security. The lever tumbler locks commonly found on bank safe-deposit boxes are specially designed to offer a high level of security. Disc tumbler locks offer a medium level of security. They re often used on desks, file cabinets, and automobile
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