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Disc Tumbler Locks
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60.325 mm 57.150 mm 53.975 mm 50.800 mm 47.625 mm 44.450 mm 41.275 mm 38.100 mm 34.925 mm 31.750 mm 28.575 mm 25.400 mm 22.225 mm 19.050 mm 12.700 mm 9.525 mm 6.350 mm 4.775 mm 3.175 mm 1.600 mm 1.600 mm 3.175 mm 4.775 mm 6.350 mm 9.525 mm 12.700 mm
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OUTSIDE
INSIDE
Figure 6.12 Cam lengths and offsets. (Dominion Lock Co.)
Six
15.88mm
5/8"
28.58mm 3.97mm
5/32"
11/8"
28.58mm 3.97mm 3.18mm
1/8" 5/32"
11/8"
3.97mm 11.91mm
15/32"
5/32"
18.26mm
23/32"
18.26mm 29.37mm
23/32"
29.37mm
15/32"
15/32"
4.76mm (2 holes)
3/16"
11.11mm
3/16"
7/16"
15.88mm
5/8"
45.24mm
125/32"
4.76mm 54.77mm
25/8"
15.88mm
5/8"
DIA.
1/4"
6.35mm
6.35mm 31.75mm
1/4"
11/4"
11.11mm
7/16"
14.29mm
9/16"
101.60mm
15.88mm
5/8"
31.75mm 34.93mm 4.76mm (2 holes) 23.81mm
15/16" 3/16"
11/4"
37.31mm
115/32"
57.75mm 47.63mm
21/4"
13/8"
17/8"
4.76mm (2 holes)
3/16"
Figure 6.13 Hook, offset, double-ended, and miscellaneous-type cams. (Dominion
Lock Co.)
Disc Tumbler Locks
Figure 6.14 Disc tumblers have five variations.
Figure 6.15 The position of the tumblers gives a general idea of the key profile.
Double-Bitted Disc Tumbler Locks The Junkunc Brothers American double-bitted disc tumbler lock is often found in padlocks and office and utility locks (Fig. 6.16).
Operation
When the double-bitted key is inserted, it passes through the center of the tumblers (as in a disc lock) and aligns them to the shear line, allowing the plug to rotate. But, the key and the tumbler arrangement is different from that of the regular disc lock. The key cuts are wavy in appearance; thus the tumblers have to align in a wavelike configuration for the lock to open. Further, there are no definitive tumbler cuts on the key. This is because the key holds 10 or more tumblers compressed together and held in a locked position by means of a Z-shaped wire within the tumblers. All the tumblers are uncoded, meaning they are all of a standard cut. For them to turn within the cylinder, the tumblers have to be cut down. A special keying tool is used for this purpose.
Six
Figure 6.16 Double-bitted padlock
and key. (American Lock Company)
Cutting down the tumblers
1. Insert the tumblers into the plug (with the tumbler spring in place), then insert the precut key into the plug. 2. Mount the plug firmly in your vise. 3. Attach the keying tool to a 1 4-inch drill. Drill the back of the plug. Since the inside diameter of the drill is the same as the outside diameter of the plug, the individual tumblers will cut down to what will be the shear line. 4. Trim the tumblers with a light wire brush to take off any burrs. 5. Insert the plug into the cylinder and test it. Attach the retainer screw and withdraw the key. 6. Since they are uncoded, the tumblers can be used within any plug. The tumbler spring, because of the shape, holds the various tumblers in the locked position. Only with the insertion of a key, which forces the tumblers into another position, can the lock be opened.
Keys and keyways
The double-bitted lock takes four basic key sections (Fig. 6.17). These sections, of course, match the shapes of the keyways. Keyway one is referred to as a K4 and the center point is at the center of the tumbler. Keyway two is referred to as a K4L; the center point is just left of center. Keyway three is called a K4R; the center point is right of center. Keyway four, called a K4W, is shaped like a W. The keyway shape does not reflect the tumbler types that are within any given plug.
Disc Tumbler Locks
Figure 6.17 Four basic doublebitted key sections. (Taylor Lock Company)
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Pin Tumbler Locks
There are many types of pin tumbler locks. They come in various forms, including deadbolt, key-in-knob, lever, padlocks, and automobile ignition locks. The common denominator among pin tumbler locks is that they all have a pin tumbler cylinder or housing. When a pin tumbler lock is installed on a door, you can usually see only the lock s plug or the face of its cylinder. Figures 7.1 and 7.2 show examples of common pin tumbler locks. You can quickly identify a pin tumbler lock by looking into its keyway. You ll see one or more pin tumblers hanging down (Fig. 7.3). Construction Although pin tumbler cylinders are simple mechanisms, some of the most secure mechanical locks rely on such a cylinder. Most pin tumbler cylinders are self-contained mechanisms. They come in a variety of shapes to fit locks of various designs. Figures 7.4, 7.5, and 7.6 show different types of pin tumbler cylinders. The basic parts of a pin tumbler cylinder include a cylinder case (or shell), plug (or core), keyway, upper pin chambers, lower pin chambers, springs, drivers (or top pins), and bottom pins. It s easy to remember all those parts once you understand their relationships to each other. The cylinder case houses all the other parts of the cylinder. Figure 7.7 shows the parts of a pin tumbler cylinder. The part that rotates when the proper key is inserted is called the plug. The keyway is the opening in the plug that accepts the key. The drilled holes (usually five or six) across the length of the plug are called lower pin chambers; they each hold a bottom pin. The corresponding drilled holes in the cylinder case directly above the plug are called upper pin chambers; they each hold a spring and a driver.
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