Protective casing arranged on a driving pinion for bicycles encloses a drive chain to protect from dirt

摘要

Protective casing (3) arranged on a driving pinion (1) encloses a drive chain (2) to protect from dirt. An opening (6) formed along the casing is structured so that the driving pinion fits through it into the inside of the casing. The opening receives the drive chain in the casing and simultaneously holds and centers the casing on the drive chain and on the driving pinion. Preferred Features: The protective casing continues along the chain line (4) outside the region of the driving pinion.