By James M. Edgar
Using Locks in actual Crime Prevention: nationwide Crime Prevention Institute
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Additional info for The Use of Locks in Physical Crime Prevention. National Crime Prevention Institute
The Abloy rotating detainer disc features false gates for pick resistance. The tailpiece keeps the discs aligned properly in the cylinder. The detainer discs are of stamped brass. There are six combination cut locations. The numbers range from 0 to 5, and are read from left to right as you go around the top of the disc. The first step to remember in disc identification is to imagine the disc as the face of a clock. With the tailpiece in the 6 o'clock position, and the top center of the disc at the 12 o'clock position, note that the 0, 1 and 2 cuts are to the left of the 12 o'clock position, and the 3, 4 and 5 cuts are to the right ALL TUMBLERS MUST BE AT SPECIFIC HEIGHTS AND ANGLES FOR UNLOCKING LOCKED UNLOCKED LOCKING SLOT IN CYUNDER SIDE BAR ENGAGESSLOTS ON ALL TUMBLERS IN UNLOCKED POSITION SIDE BAR IN LOCKED POSITION KEY B I T T I N G A N G L E S C A N N O T BE D U P L I C A T E D ON O R D I N A R Y KEY CUTTING MACHINES ARROW INDICATES DIRECTION OF SLOT IN KEY TO PROPERLY ALIGNED TUMBLER ANTI-DRILLING HARDENED STEEL BALL IN END OF SIDE BAR Figure 1-24.
The number of tumblers in a lock always corresponds to the number of symbols used in its combination. Few modern combination locks use more than four tumblers because combinations of five or more symbols are unwieldy and hard to remember. Older models, however, used as many as six. 36 THE USE OF LOCKS IN PHYSICAL CRIME P R E V E N T I O N BoltLevw Bolt Figure 1-31. Three-tumbler combination. Both drive cam and dial are fixed to the spindle so that as the dial is rotated, the drive cam will also rotate in an identical fashion.
The last disc assembled in the cylinder is the rotating lifting zero. In between are the combination discs. Also, between each disc is a spacer. The spacer is used like a bearing to reduce friction and wearing of the discs. Also, minimal contact between the spacer and the disc helps protect the lock from freezing. The spacer is made of a tin-copper material with a hole in the center to allow passage of the key, and a notch at the top which aligns with the sidebar groove in the cylinder to allow the sidebar to drop into the aligned cuts of the disc.