| 摘要 |
The invention relates to a security turnkey with a dedicated cylinder (Z), comprising a block groove (BN) with a coded block depth (B1, B2, B3), runnin g parallel to the key axis (x), from the key tip to at least the first positio n (P1) of a tumbler row (A2) on the key. The dedicated cylinder has, at least in the rearmost coded position (P1), a tumbler pair corresponding to one of the block grooves (BN) and is provided with a block tumbler (BZ) and an elongate d counter block tumbler (BG), whereby the counter block tumbler (BG) stands proud on the cylinder shell (10) when the block groove is too shallow and th us prevents the complete insertion of a key, by means of the block tumbler pair . At the same time the block tumbler (BZ) with the counter tumbler (BG) in position (P1) also serve as coding tumblers. |
