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Combination lock
A combination lock is a type of padlock in which a sequence of numbers or symbols is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or ''cams'', by using a set of several rotating discs with inscribed numerals which directly interact with the locking mechanism, or through an electronic or mechanical keypad. Types range from inexpensive three-digit luggage locks to high-security safes. Unlike a regular padlock, combination locks do not use keys.
==History==
The earliest known combination lock was excavated in a Roman period tomb on the Kerameikos, Athens. Attached to a small box, it featured several dials instead of keyholes. 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'').〔Paul Vallely, (How Islamic Inventors Changed the World ), ''The Independent'', 11 March 2006.〕 Muhammad al-Astrulabi (ca. 1200) also made combination locks, two of which are kept in Copenhagen and Boston Museums〔Hill, D.R. (1998) Studies in medieval islmaic technology, Ashgate.〕.
Gerolamo Cardano later described a combination lock in the 16th century.
In 1878 a German man by the name of 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.〔"IMPROVEMENT IN TUMBLERS FOR PERMUTATION-LOCKS" by Joseph Loch, U.S. patent 200070, 5 Feb. 1878. Found in Google Books. ()〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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