PREPARATION, PROTECTED KEY, CLOSING SYSTEM AND METHOD OF MANUFACTURE Russian patent published in 2017 - IPC E05B19/00 

FIELD: construction.

SUBSTANCE: blank (R) contains two parallel side grooves (RB-SN) and a central protruding part (RB-M) between them. The side grooves extend at the upper level (N1) in the input area (RB-E) and in a recessed manner at the lower level (N2) in the first coded area (RB-P). The key (S) is made from the preform with the central groove (RB-MN) in the input region and the codepoint indentations (Cod-V) in the coded region on the central protruding portion (RB-M). The side grooves of the workpiece and the central groove of the key provide a new composite groove for the blocking code of the workpiece = RB-SN+RB-MN. The key in the cylinder (Z) corresponds to a special switching pin (RB-ZH) with lateral arms (RB-ZH-S), whose shape corresponds to the side grooves (SB-SN) and the central groove (RB-MN), so that by means of a special Pin, an additional blocking of the insert in the input area and additional rotation blocking in the coded area was formed.

EFFECT: significant improvement in the safety of the locking system and the prevention of counterfeits and unauthorized copies of the key.

18 cl, 30 dwg