treadressekode

Treadressekode, often shortened to TRE, is a type of security code used in some older mechanical lock systems. Its primary function is to ensure that the correct key is inserted into the lock before it can be operated. This is achieved through a series of notches or cuts on the key, which correspond to specific movements or positions within the lock mechanism. When a key with the correct treadressekode is inserted, these notches align in a way that allows the internal tumblers or levers to be manipulated, thus unlocking or locking the mechanism.

The term "treadressekode" itself suggests a "tread" or step-by-step sequence, emphasizing the precise alignment required. These codes are not typically electronic and rely on purely mechanical interaction. While effective for their intended purpose, the security provided by treadressekode systems is generally considered lower compared to modern electronic or high-security mechanical locks. Their primary advantage was in preventing the accidental use of incorrect keys, a common issue with simple key systems. Today, treadressekode is less prevalent in new lock designs, having been largely superseded by more sophisticated security technologies. However, it can still be found in legacy systems, particularly in certain industrial or specialized applications where the original design remains in use.