Key for rotary plug and cylinder lock, and method of forming the key

摘要: A difficult-to-duplicate key for operating a rotatable plug and cylinder lock has an imaginary center axis that extends along the length of at location situated between opposed, relatively narrow edge surfaces, centered wide side surfaces. The surfaces cooperate to define generally rectangular cross section. First, second third rows concave recesses are formed in extend lengthwise receiving rounded inner end regions pin tumblers when is inserted position keyway positioning permit be rotated relative cylinder. first, sets recess axes planes, respectively, radiate from axis. Non-standard angular relationships planes utilized orient non-standard, non-symmetrical non-aligned manner causes least one (preferably two) non-circular shape difficult "read" determine key's orientation. use shapes together with non-standard orientations renders duplication difficult.