Copyright 2005 by Bill Phillips. Click here for terms of use. in .NET

Generate QR Code JIS X 0510 in .NET Copyright 2005 by Bill Phillips. Click here for terms of use.

Copyright 2005 by Bill Phillips. Click here for terms of use.
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Operation The disc lock employs a rotating core, as does the more familiar pin tumbler design. The disc tumbler core is cast so the tumblers protrude through the core and into slots on the inner diameter of the cylinder. So long as the tumblers are in place, the core is locked to the cylinder. The key has cuts that align with the cutouts in each tumbler. The key should raise the tumblers high enough to clear the lower cylinder slot but not so high as to enter the upper cylinder slot. In other words, the correct key will arrange the tumblers along the upper and lower shear lines (Fig. 6.2). The plug is free to rotate and, in the process, throw the bolt. The key resembles a cylinder pin-tumbler key except that it is generally smaller and has five cuts. A cylinder pin tumbler key might have six or seven cuts.
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First tumbler
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No key inserted Wafers protrude past plug shear lines
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Figure 6.2 Parts of a common disk tumbler desk lock and a typical key
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for such a lock.
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Disassembly Good quality disc locks have a small hole on the face of the plug, usually just to the right of the keyhole. To disassemble the lock, insert a length of piano wire into the hole and press the retainer clip. Turn the plug slightly to release it. The key gives enough purchase to withdraw the plug. If a key is not available, you can extract the plug with the help of a second length of piano wire inserted into the keyhole. Bend the end of the wire into a small hook. Other locks attach the plug to the cylinder with the same screw that secures the boltactuating cam. Others (fortunately, a minority) have the plug and cylinder brazed together. File off the brass. Keying Manufacturers have agreed on five possible positions for the cutouts relative to the tumblers. Keying is a matter of arranging the tumblers in a sequence that matches the key cuts. Once the sequence has been identified, install the tumbler springs over their respective hooks and mount the tumblers in the plug. The tumblers are spring-loaded and, until the plug is installed in the cylinder, are free to pop out. Lightly stake them in place with a punch or the corner of a small screwdriver blade. One or two pips are enough because you will break the tumblers free once the assembly is inside the cylinder. Inserting the key is enough to release the tumblers. Security These locks usually have no more than five tumblers, and each tumbler cutout 5 has five possible positions. These variations allow 3125 or 5 key changes. In practice, the manufacturer will discard some combinations as inappropriate and may further simplify matters by limiting the key changes to 500 or less. Obviously, disc tumbler locks are not high-security devices. Cam Locks Cam locks are used for a variety of general and special purposes (Fig. 6.3). More than likely, you will see approximately 90 percent of these units in offices. From the face (or front) these locks look pretty much the same after they have been installed. Inside, however, they may differ in various regards. The illustrations on the next several pages are exploded views of different models and the parts associated with each. These models are all five-disc tumbler locks, each with a possibility of 200 different key combinations. Because of the key variations possible, these locks are often masterkeyed prior to purchase by the customer. Only by disassembling the lock or viewing the tumblers through the keyway will you know for sure whether or not the lock is masterkeyed (Figs. 6.4 through 6.9).
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Figure 6.3 Disc tumbler cam lock. (Dominion Lock Co.)
Two other core-type cam locks are shown in Figs. 6.10 and 6.11. These cam locks with removable cores are of the seven-pin variety that uses the Ace-type circular key. A variety of cams is used with these locks. Figure 6.12 is a chart showing the various types of cams available. The length and offset specifications are also included. Figure 6.13 shows the hook, bent, double-ended, and other miscellaneous cams that you may come across in the course of your work. The standard thickness of a cam is 3 32 inch (2.667 mm). Cams are made of steel; many are cadmium-plated for durability and longevity. Reading Disc Tumbler Locks It s not unusual for a locksmith to be asked to make a key for a lock whose original key was lost or misplaced. If the lock does not have a code number on its face or if the owner neglected to write down the number on the key, the locksmith has three choices: Pick the lock, impression a key, or read the lock. Like impressioning, reading a lock is a skill that must be developed through patient practice. You cannot expect to master this skill quickly, nor can you expect to remain proficient in it without constant practice. At first, practice daily, then weekly or twice weekly to maintain your skill. When called on to fit a key, either by impressioning or reading of the lock, the locksmith invariably looks into the lock keyway. A quick glance determines whether it is a lever, disc, or pin tumbler lock.
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