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A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
Higher security lever locks (such as the five-lever) usually have notches cut into the levers. These catch the locking bolt and prevent it from moving if picking is attempted (similar to the security pins in a pin tumbler lock). The Chubb detector lock is a variation of the lever lock which was designed to detect and prevent picking attempts.
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.
The underside of a disc tumbler lock A key for a disc tumbler lock. A disc tumbler or disc detainer lock is a lock composed of slotted rotating detainer discs. The lock was invented by Finnish founder of Abloy, Emil Henriksson (1886–1959) in 1907 and first manufactured under the Abloy brand in 1918.
In pin tumbler locks, the series of key cuts on a key causes the pins to line up at the shear line or gate so the lock will open. In warded locks, the key cuts bypass the wards so the key can push or pull the bolt. [6] Key pin In a pin tumbler lock, the key pin is in contact with the key. It has varying lengths, corresponding to the key's ...
Assa Abloy was founded at the merger of the two companies Assa and Abloy in 1994. Assa stands for August Stenman Stenman August. [7] [8] The name Abloy comes from a contraction of the Swedish Finnish bilingual name Ab Låsfabriken Lukkotehdas Oy, meaning literally Corp. Lock Factory Lock Factory Corp. (first Corp. and Låsfabriken from Swedish, last Lukkotehdas and Corp. from Finnish).
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