Motor vehicle cylinder lock with notched key - has tumbler actuating curved notches with contact flat faces for tumblers

摘要

Motor vehicle door cylinder lock has cylinder with key with stepped notches. The lock is designed to prevent vehicle theft with forged keys. The curved notches (18) in the key (5) have in the region of tumblers (4) flat surfaces (19) parallel to the key axis (20). The flat surfaces (19) are at least twice as wide as the width B of the depression (15) in the key (5). The notches are machined to have a curved shape at the notch ends.