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Figure 18.1 A typical dial combination padlock in exploded view. (Desert Publications)
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Combination Locks
is the second number of the combination. The third number comes easier than either the first or second one. The dial may stop at either the first or second number. Since many of the earlier combination locks did not have the accuracy of modern locks, the bolt catches at any one of the three numbers at any time. You have the three numbers, but perhaps not in their correct order. Vary the sequence of the numbers until you hit the right one. Because of imperfections in older and inexpensive modern locks, the bolt may stop at points other than the gates. Only through practice can you learn to distinguish between true and phantom gates. For practice, obtain two or three locks of the same model. Disassemble one to observe the wheel, gate, and bolt relationship and response. These insights will help you manipulate the other two locks. Drilling As a last resort, all combination locks can be opened by drilling. To drill these locks follow this procedure: 1. Drill two 1 8-inch holes in the back of the lock. 2. Turn the dial and determine that the gate of one wheel is aligned with one of the holes. You might be able to see the gate. If that fails, locate the gate with a piece of piano wire inserted through one of the holes. 3. When the gate and the hole are aligned, note the number on the dial face. Determine the distance, as expressed in divisions on the dial, between the hole and bolt. 4. Subtract this distance from the reading when the gate is aligned with the hole. The result is the combination number for that wheel. 5. Reverse dial rotation and find the number for the second wheel. Do the same for the third. Changing Combinations Many locks are designed for combination changes in the field. Three of them are described here.
Sargent and Greenleaf
S & G padlock combinations are changed by key. 1. Turn the numbers of the original combination to the change-key mark located 10 digits to the left of the zero mark on the dial face. 2. Raise the knob on the back of the lock to reveal the keyway. Insert the key and turn 90 .
Eighteen
3. Repeat step 1, but use the new combination and the change-key mark as zero. 4. Remove the change key and test the new combination.
Simplex
The Simplex is a unique combination lock, employing a vertical row of pushbuttons rather than the more usual dial (Fig. 18.2). 1. Turn the control knob left to activate the buttons. 2. Release the knob and push the existing combination (Fig. 18.3). 3. Push down the combination change slide on the back of the lock (Fig. 18.4). 4. Turn the control knob left to clear the existing combination (Fig. 18.5). 5. Push the buttons for the new combination firmly and in sequence (Fig. 18.6). 6. Turn the control arm right to set the new sequence (Fig. 18.7).
Figure 18.2 The Simplex pushbut-
ton combination lock. (Simplex Access Controls Corp.)
Figure 18.3 Changing Simplex combination, Step 2.
Figure 18.4 Changing Simplex
combination, Step 3.
Combination Locks
Figure 18.5 Changing Simplex combination, Step 4.
Figure 18.6 Changing Simplex combination, Step 5.
Figure 18.7 Changing Simplex combination, Step 6.
Dialoc
Partial disassembly is required to change the combination. Refer to Fig. 18.8 for the parts numbers in the following steps.
To disassemble:
1. Remove the Dialoc from the door by withdrawing the two mounting screws 487-1, holding the inside plate 821 against the door. 2. Place the outside plate 820 face down on a smooth work surface so that housing 414 is facing up. 3. Remove the three nuts 484-5 holding the housing cover 745. 4. After removing the nuts, gently lift the housing cover up and away from the housing. Take care that control-bar spring 744 is not dislodged and lost in the process. Lay it where it won t get lost. 5. Remove the secondary arm 402. 6. Grasp the end of the control bar 726 and lift out the four ratchet assemblies. Observe how they are arranged before dismantling. Now you can rearrange these four ratchet assemblies to get a new combination. (Should you want to use numbers that are not in the present combination,
366 Figure 18.8 The very sophisticated Dialoc 1400. (Dialoc Corporation of America)
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