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retaining pin with an Ace part, available from locksmith supply houses.
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Rekeying. Rekeying is not difficult if you approach the job in an orderly
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manner. 1. Cut the key. There are seven bit depths, ranging from 0.020 to 0.110 inch in 0.015-inch increments. 2. Remove the pins with tweezers. Note: Pin lengths range from 0.025 to 0.295 inch in increments of 0.015 inch. Drivers are available in 0.125-, 0.140-, and 0.180-inch lengths. 3. Select new pins using the key combination as a guide. 4. Install the pins. The flat ends of the core pins are toward the key (Fig. 7.26). This pattern must be followed:
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Core pins 1, 2, and 3 require 0.180-inch drivers. Core pins 4 and 5 require 0.140-inch drivers. Core pins 6 and 7 require 0.125-inch drivers. Note: Pins are numbered clockwise from the top as you face the lock. Insert the key. 5. Install the plug in the cylinder with the scribe marks aligned. 6. Insert a new retaining pin and give it a sharp tap with a punch. 7. Test the key. It may be necessary to rap the cam end of the plug with a mallet.
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A lockout can be a real headache. Ordinary tubular key locks those without ball bearings can be drilled out with the tool shown in Fig. 7.28. Hole saws are available for standard and oversized keyways.
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Figure 7.28 Drilling the lock requires a piloted hole saw, available
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from locksmith supply houses. (Desert Publications)
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High-Security Mechanical Locks
With respect to locking devices, the term high security has no precise meaning. Some manufacturers take advantage of that fact by arbitrarily using the term to promote their locks. Most locksmiths would agree that to be considered high security a lock should have features that offer more than ordinary resistance against picking, impressioning, drilling, wrenching, and other common forms of burglary. The most secure locks also provide a high level of key control. The harder it is for an unauthorized person to have a duplicate key made, the more security the lock provides. Underwriters Laboratories Listing Founded in 1894, Underwriters Laboratories, Inc. (UL) is an independent, nonprofit product-testing organization. A UL listing (based on UL standard 437) is a good indication that a door lock or cylinder offers a high degree of security. If a lock or cylinder has such a listing, you ll see the UL symbol on its packaging or on the face of the cylinder. To earn the UL listing, a lock or cylinder must meet strict construction guidelines and a sample model must pass rigorous performance and attack tests. Some of the requirements are as follows:
All working parts of the mechanism must be constructed of brass, bronze, stainless steel, or equivalent corrosion-resistant materials or have a protective finish complying with UL s Salt Spray Corrosion test. Have at least 1000 key changes. Operate as intended during 10,000 complete cycles of operation at a rate not exceeding 50 cycles per minute.
Copyright 2005 by Bill Phillips. Click here for terms of use.
Eight
The lock must not open or be compromised as a result of attack tests using hammers, chisels, screwdrivers, jaw-gripping wrenches, pliers, hand-held electric drills, saws, puller mechanisms, key impressioning tools, and picking tools.
The attack test includes 10 minutes of picking, 10 minutes of key impressioning, 5 minutes of forcing, 5 minutes of drilling, 5 minutes of sawing, 5 minutes of prying, 5 minutes of pulling, and 5 minutes of driving. Those are net working times, which don t include time used for inserting drill bits or otherwise preparing tools. Key Control Another important factor in lock security is key control. The most secure locks have patented key blanks that are available only from the lock manufacturer. At the next level of key control are key blanks that can be cut only on special key machines. This type of key control greatly reduces the number of places where an unauthorized person can have a key duplicated. The least secure locks use keys that can be copied at virtually any hardware or department store. Lock and Key Patents One feature of a high-security lock is that it provides a high degree of key control. That is, there is restriction on who can make a copy of the key. Such locks are used in situations where you don t want just anybody to be able to run down to the local hardware store and make copies. One way of restricting copies is by having a patented lock or blank. That allows a lock manufacturer to decide who may copy its keys. Not all patents offer a lot of key control, however. There are two relevant types of patents: design and utility. A design patent only protects how a thing looks. In 1935, Walter Schlage received a design patent for a key bow. The bow s distinctive shape made it easy for locksmiths and other key cutters to recognize the company s keys. But the patent didn t prevent aftermarket key blank manufacturers from making basically the same key blanks with slightly different bow designs. Design patents are good for 14 years. Utility patents are more popular and provide more protection against unauthorized manufacturing. All patents expire eventually, and they aren t renewable. Utility patents are granted for 20 years, beginning on the application filing date. Medeco Security Lock s original utility patent (No. 4,635,455) was issued in 1970. Because that patent prevented companies from making key blanks that fit Medeco locks, the company was able to maintain maximum key control. As soon as the patent expired (in 1986), many companies began offering compatible key blanks. The company responded by introducing a new lock, the Medeco Biaxial, getting a utility patent (No. 4,393,673) that expired in 2004. The company s newest patented product is its Medeco3, which expires in 2021. Table 8.1 shows the patent expiration dates for several high-security locks.
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