A user who knows the correct sequence of pushes can properly align all wheels and open the lock. Pushing each button on the face of the lock rotates one or more wheels inside the lock. Pushbutton locks uses numbered or lettered buttons to properly align internal components. Opening one in this fashion depends on slight irregularities in the machining of the parts. This lock is considered to be one of the least secure types of combination lock many locks of this type can be quickly opened without knowledge of the correct combination. When the notches in the discs align with the teeth on the pin, the lock can be opened. The lock is secured by a pin with several teeth on it which hook into the rotating discs. One of the simplest types of combination lock, often seen in low-security bicycle locks and in briefcases, uses several rotating discs with notches cut into them. In reality, safemakers install false click generating mechanisms and sound deadening devices on the catches to make aural detection extremely difficult. The principle is that each dial catch will make a small sound when it rotates into position. In movies, rotary combination locks on bank vaults are commonly opened by thieves using a stethoscope. The process is completed back and forth until all discs are in place, and the lock is released. In this way, the remaining discs are able to rotate and change their position without further disturbing the last disc. Once all discs and the dial are rotating together, the dial is rotated until the last disc is in place and the notch is in the proper positioning, then by rotating the dial in the other direction, the catches will all disconnect, starting from the dial to the first disc and so on until they connect from the other side and the discs begin to rotate together by the same method but in the opposite direction. As this disc rotates, its catch will in turn begin rotating the next disc in a similar fashion. As the dial rotates, there will not be enough space for the catch on the dial to pass the catch on that side of the disc, and so the disc will begin to rotate with the dial. The position of the discs are manipulated by turning the dial left and right on the dial is a catch - a sort of nub - and on each side of the discs is also a small catch. Rotary combination locks are commonly used on safes, vaults, and padlocks.Ĭontained inside the mechanism are discs, usually three, with notches that must be aligned to allow for a release of the piece holding the lock in place, and the lock to open. For several decades Loch made many more improvements in the design and function of combination locks.Ī rotary combination lock uses a single dial which must be rotated left and right in a certain combination in order to open the lock. In 1878, Joseph Loch (Germany) modified Yale's design for Tiffany's Jewelers in New York City. contributed the first modern style rotary combination locks in the early 1870s. Gerolamo Cardano later described a combination lock in the 16th century. Muhammad al-Astrulabi (ca 1200) also made combination locks, two of which are kept in Copenhagen and Boston Museums. In 1206, the Muslim engineer Al-Jazari documented a combination lock in his book al-Ilm Wal-Amal al-Nafi Fi Sina'at al-Hiyal (The Book of Knowledge of Ingenious Mechanical Devices). Attached to a small box, it featured several dials instead of keyholes. The earliest combination lock was excavated from a Roman tomb in Athens, Greece.
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