Interchangeable core lock cylinder
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An interchangeable core lock cylinder is a lock cylinder that can be removed by using a special key (control key) that is combinated into the pin segments of the cylinder. Interchangeable cores can be removed from one type of lock (bored cylindrical lock, mortise lock, padlock, etc.) and placed into another lock without need of dismantling or removal of the lock cylnder or lock. Interchangeable core lock systems were designed to permit the owner of the system to change the locks without need of special locksmithing skills and tools, or the need to summon a locksmith in an emergency. Most interchangeable lock systems come with spare cores to allow instant replacement in an emergency (such as a stolen key or personnel change) and maintain security. The old cores are then sent to a locksmith to be rekeyed for later use. Interchangeable core locks are readily adapted for master keying systems.
The interchangeable core was invented by Frank Best in 1912. Frank Best went on to found Best Universal Lock Company which eventually came to be Best Access Systems, Inc.
The Best style of interchangeable core has become the most well known type of interchangeable core cylinder, and is easily regonizable by the 'figure-8' shape of the core's face. This type of cylinder is also offered by many other commercial lock manufacturers and is often referred to as a small format interchangeable core (SFIC).
Additionally, other formats of interchangeable core cylinders are also available from various other manufacturers, including Schlage, Medeco, Sargent, Corbin-Russwin and Yale Lock.
