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Types of Locks and Keys
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doors and glove compartments. Pin tumbler locks can provide medium to high security, but in general they offer more security than do other types of tumbler locks. Many prison locks and virtually all house locks and high-security padlocks use pin tumbler cylinders. Some automobile door and ignition locks also have pin tumblers. A special type of pin tumbler lock, called a tubular key lock (or tubular lock), has its tumblers arranged in a circular keyway (Fig. 3.10). It uses a tubular key to push the tumblers into proper alignment. Because of its odd appearance, a tubular key lock is harder for most people to pick open than are standard pin tumbler locks. Sometimes erroneously called Ace Locks (which is Chicago Lock Company s trade name for some of its tubular key locks), tubular key locks are often found on vending machines, laundromat equipment, bicycle locks, and high-security padlocks. Another type of pin tumbler system is found in interchangeable core (IC) locks. Although they come in the form of deadbolts, key-in-knobs, rim locks, mortise locks, padlocks, and desk and cabinet locks, all locks in an IC system can either use the same key or be masterkeyed. Some examples of IC locks are shown in Fig. 3.11. The common feature of IC locks is a figure 8-shaped core that houses the tumblers and springs. The cores can be easily removed and replaced (Fig. 3.12). Any IC lock can be rekeyed simply by inserting new cores in the locks.
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Figure 3.10 A cross-section of a tubular key lock. (Desert Publications)
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Figure 3.11 Types of IC locks. (Arrow Lock Company)
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Figure 3.12 An IC core can be
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inserted into many different IC locks. (Arrow Lock Company)
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Other types of locks
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Combination locks are popular alternatives to key-operated models. The two basic styles are pushbutton and dial. Pushbutton combination locks are operated by pushing a specific sequence of buttons, which are usually labeled with letters or numbers (Fig. 3.13). Dial combination locks are operated by rotating one or more dials to specific positions (Fig. 3.14). An electrical lock can be operated by electric current. One type, sometimes called an electric lock, is basically a bolt or bar mechanism that doesn t have a keyed cylinder, knob, or turn piece and can t be operated mechanically.
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Types of Locks and Keys
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Another type, called an electrified lock, is a modified mechanical lock that can be operated either mechanically or with electricity. Electric switch locks complete and break an electric current when an authorized key is inserted and turned. An automobile ignition lock is an example of such a lock; after the key is turned, electricity flows from the battery to the car s starter. Similar locks are also used on alarm system control boxes to arm and disarm the system. Time locks are designed to be opened only at certain times on certain days. They re commonly installed inside bank vaults and safes. Biometric locks unlock only after a computer has verified a physical feature, such as a fingerprint, signature, voiceprint, hand geometry, or the pattern of the retina of the eye.
Figure 3.13 Some combination locks use pushbuttons. (Simplex Access Controls Corp.)
Figure 3.14 Many padlocks have
dial combinations. (Master Lock Company)
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Lock Grades The American National Standards Institute, Inc. (ANSI) determines manufacturing standards for a wide variety of building hardware and other products used in the United States. Many manufacturers make sure their products meet or exceed ANSI standards because architects, home builders, locksmiths, and other professionals specify products based on the standards. As a rule, ANSI doesn t create standards. Interested industry associations usually create and propose standards and ANSI reviews them for possible adoption. The current standards for door hardware, listed under ANSI section 156, were proposed by the Builders Hardware Manufacturers Association, Inc. (BHMA). ANSI 156 is of special importance to locksmiths. That section includes standards for many products locksmiths sell and install, including the following:
Butts and hinges Bored and preassembled locks and latches Exit devices Door closers Auxiliary locks and associated products Architectural door trim Template hinge dimensions Cabinet hardware Power pedestrian doors Cabinet locks Interconnected locks Mortise locks and latches Sliding and folding door hardware Closer holder release devices Auxiliary hardware Hinges and pivots Strap and tee hinges and hasps Thresholds Electromagnetic locks Delayed egress locks ANSI/BHMA A156.1 ANSI/BHMA A156.2 ANSI/BHMA A156.3 ANSI/BHMA A156.4 ANSI/BHMA A156.5 ANSI/BHMA A156.6 ANSI/BHMA A156.8 ANSI/BHMA A156.9 ANSI/BHMA A156.10 ANSI/BHMA A156.11 ANSI/BHMA A156.12 ANSI/BHMA A156.13 ANSI/BHMA A156.14 ANSI/BHMA A156.15 ANSI/BHMA A156.16 ANSI/BHMA A156.19 ANSI/BHMA A156.20 ANSI/BHMA A156.21 ANSI/BHMA A156.23 ANSI/BHMA A156.24
ANSI 156.2 includes provisions for locks to be Grade Certified. For a model to receive a grade, which ranges from 1 to 3, a sample lock must pass many rigorous tests that examine the lock s performance, strength, and durability. Grade 1 locks are the strongest and are often specified for industrial applications. Grade 2 locks are for light commercial and residential uses. Grade 3 locks are the lightest and are primarily for residential applications. Some of the
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