Patent ID: 7987691

Claim:
A method for the manufacturing of washers for locking, each washer having a central hole, a first side comprising a pattern of radially extending teeth and a second side comprising a pattern of radially extending cams, the method comprising: forming each washer in successive operations from a washer blank strip, each washer being punched out in a final punching operation, the forming including, forming in a first forming punching operation the pattern of radially extending teeth on the first side of the washer and the pattern of radially extending cams on the second side of the washer, and further including forming a flat surface edge zone on either the first side or the second side of the washer, wherein the flat surface edge zone extends radially outside the pattern of radially extending teeth when formed on the first side, and wherein the flat surface edge zone extends radially outside the pattern of radially extending cams when formed on the second side, and in the final punching operation performed after the first forming punching operation, punching out the washer with a punch acting against at least a part of the flat surface edge zone.