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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.
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.
A wheel hub with a castellated nut secured in the center using a cotter pin to prevent it from unscrewing. A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener.
The Dainese Technology Center (D-Tec) develops protection and apparel-related technologies for the group companies and other applications. The company has registered 118 patents. [24] In MotoCAP's independent safety research, various Dainese products – such as the Avro 4, Prima72 and Fighter jackets – have achieved high test scores. [25]
[4] Bottom pin See key pin. Break A break in the pins is a separation in one or more sections of the pin used to encode the lock for a specific key or set of keys in a master keying system. Driver pin In a pin tumbler lock, the driver pin is in contact with the spring and interferes with the rotation of the plug when no key is inserted. When ...
[7] [8] To bump a lock, a person inserts a bump key into the key way one notch (pin) short of full insertion, then bumps the key inward to push it deeper into the key way. The specially designed teeth of the bump key transmit a slight impact to all of the key pins in the lock.
A safety wire is used to ensure proper security for a fastener. The wire needed is long enough to reach from a fixed location to a hole in the removable fastener, such as a pin — a clevis fastener, sometimes a linchpin or hitch-pin through a clevis yoke for instance — and the wire pulled back upon itself, parallel to its other end, then twisted, a single end inserted through a fastener ...
Lock and key, a mechanical device used to secure items of importance; Lock (firearm), the ignition mechanism of small arms Lock (water navigation), a device for boats to transit between different levels of water, as in a canal