A central derailleur of the chain of transmission of bicycles with central gear of several relations of speed (Machine-translation by Google Translate, not legally binding)

摘要

A central derailleur of the bicycle transmission chain with central gear of various speed ratios, of the type in which the derailleur fork is connected to the derailleur support bracket by a pair of connecting rods forming an articulated parallelogram system, and wherein all the elements of the derailer itself are placed on the same side of said clamp, characterized by the fact that the support body, the fixing clamp, the derailleur fork and one of the connecting rods connecting said fork to the said body is obtained from sheet metal by simple die-cutting and folding operations, while the other of said connecting rods is made of wire or folded metal wire. (Machine-translation by Google Translate, not legally binding)