Patent ID: 8074480

Claim:
A rekeyable lock cylinder with fool-proof function comprising: a cylinder body having a hollow cylinder portion; a plug disposed within the hollow cylinder portion of the cylinder body having a trench, a plurality of first rack component runners communicating with the trench and a first through hole also communicating with the trench; a limit member disposed within the first through hole of the plug; a sliding block disposed within the trench of the plug having a plurality of second rack component runners corresponding to each of the first rack component runners respectively, a keyhole communicating with the second rack component runners and a second through hole communicating with the keyhole, the second through hole corresponding to the first through hole of the plug; a drive member mounted within the second through hole of the sliding block, one end of the limit member contacting against the drive member; and a plurality of rack component assemblies, each of the rack component assemblies being disposed at the first rack component runner of the plug and the second rack component runner of the sliding block and at least comprising a first rack component and a second rack component capable of engaging with the first rack component.