Lever Tumbler Locks in .NET

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Lever Tumbler Locks
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Varieties of Lever Tumbler Locks Lever tumbler locks are used in a variety of light security applications. Some of them include safe-deposit boxes, suitcases, lockers, and cabinets.
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Lever tumbler safe-deposit box locks normally have at least 6 and as many as 12 or even 14 levers. These locks require two keys. One key is assigned to the individual who rents the box; the second (or guard) key is held by the bank. Both keys are needed to open the lock. If one key could be turned to the open position by itself, it would mean that the key was faulty, the lock mechanism was in some way evaded, or the bolt post was bent or broken. Disassembly is simple. Remove the screws and lift off the plate. Notice that the lock is constructed differently than previously discussed lever tumbler locks. There are two sets of lever tumblers; two bolt pins must pass through the lever gates at the same time. Notice the unique lever shape (Fig. 5.5). The levers have a V-shaped ridge that matches a similar V cut in the bolt post. Another key, even one that is 0.001 inch off on any cut, will mesh the notches in the post and lever. This is another built-in security feature of these locks. Many safe-deposit locks have a compression spring bearing against the upper lever that forces the lever stack down, allowing no play between them. This spring is an integral part of the lock s security mechanism. Without the spring, the levers would be able to move a fraction of an inch when a key or pick irritates them. This movement is enough to provide clues for the lock pick artist. Broken springs are the main difficulty. The levers may also be at fault. The saddles may wear enough to affect the gate. In cases like this, replace the lever with a new one. Do not file the gate cut wider to compensate. Sometimes a pivot post will work loose. Repair it by rapping the post with a light hammer or by
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Figure 5.5 Notched tumblers are a security feature in some locks.
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brazing. Never use solder. You can straighten slightly bent parts, but it is best to replace the entire damaged part. Safe-deposit locks are serviced by locksmiths who enjoy high standings within the community. Unless an emergency arises, a beginning locksmith or a newcomer to the area would not get the job. This reluctance reflects the conservatism of bankers. It does not reflect on the skills of students and those working locksmiths who have had only a few months experience. Many of these men and women could repair a safe-deposit box lock without difficulty.
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Suitcase locks
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Suitcase locks are essentially simple but have been built to accept a staggering variety of keys. Ninety-nine locks out of a hundred are warded with a primitive bolt mechanism to keep the case closed. Only a few, such as the Yale luggage lock, use a lever-type mechanism. These locks offer better security than warded locks. The lock size, the depth the key is inserted, and the number of cuts are important clues to the lock type. A key for a lever tumbler lock will go 1 4 inch or deeper into the lock before turning. Warded locks are shallower. Opening suitcase locks is relatively simple. Many times one key will open several different suitcase and luggage locks. Many of these locks on the market are not designed for security. By cutting down almost any suitcase key, it is possible to make a skeleton key for emergencies.
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Locker and cabinet locks The Lock Corporation of America. The Lock Corporation of America offers a locker and cabinet with a locking spring design accompanied by a free-turning keyway that combine to make the locks pick resistant (Fig. 5.6). The locks are made of a one-piece, heavy-duty steel case, and the hardwrought steel keys and the lock case are electroplated. Another advantage to
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