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A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, 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 symbols which directly interact with the locking mechanism, or through an ...
A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.
The outer layers, known as the wheel case, contain the gate and surround the externally-toothed wheel center, change key cam, and lever arms. When a change key is inserted into the lock mechanism, it forces apart the lever arms, which then permits the wheel center to rotate freely. This in turn allows the owner to set a custom combination.
Lockmasters, Inc. markets the QX3 Combi Autodialer (LKMCOMBI) that works on a variety of 3 and 4 Wheel combination safe locks. [8] Another computer-aided method uses tools similar to autodialers, which instead make measurements of the internal components of the lock then deduce the combination in a way similar to that of a human safe cracker.
Kensington lock attached to a Kensington Security Slot on a PowerBook G4. Kensington locks can discourage opportunistic grab-and-run thefts of equipment from public locations such as coffee shops or libraries, but they are not designed to be impervious protection measures, nor are they intended to secure equipment in unattended locations, [3] because they can be torn out of equipment (although ...
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
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