![]() ![]() The cams typically have an indentation or notch, and when the correct permutation is entered, the notches align, allowing the latch to fit into them and open the lock. Customarily, a lock of this type is opened by rotating the dial clockwise to the first numeral, counterclockwise to the second, and so on in an alternating fashion until the last numeral is reached. The rotary combination locks found on padlocks, lockers, or safes may use a single dial which interacts with several parallel discs or cams. The component parts of a Stoplock combination padlock. 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. The first commercially viable single-dial combination lock was patented on 1 February 1910 by John Junkunc, owner of American Lock Company. ![]() ![]() Joseph Loch was said to have invented the modern combination lock for Tiffany's Jewelers in New York City, and from the 1870s to the early 1900s made many more improvements in the designs and functions of such locks., however his patent claim states "I do not claim as my invention a tumbler composed of two disks, one working within the other, such not being my invention.", but there is no reference to prior art of this type of lock. US Patents regarding combination padlocks by J.B.Gray in 1841 and by J.E.Treat in 1869 describe themselves as improvements, suggesting that such mechanisms were already in use. Gerolamo Cardano later described a combination lock in the 16th century. 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 known combination lock was excavated in a Roman period tomb on the Kerameikos, Athens. ![]()
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