Flat key for use with key lock, has oblong grooves formed in three directions on space on side of key shank, in which oblong grooves are individually shaped as key coding

摘要

The flat key has a key handle (11') and a key shank (12'), in which the key shank is recessed with oblong grooves that are individually shaped as key coding. The oblong grooves are formed such that the key coding is formed in three directions in space. The oblong grooves are formed on the side of the key shank in wave-shape, and formed with different length, height and depth levels.