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 means of an articulated parallelogram levers system, and in which all the elements of the derailer itself are placed on the same side of said clamp, characterized by the fact that all its parts, except for the loading spring, bolts and screws, have been obtained from sheet metal by die-cutting and folding. (Machine-translation by Google Translate, not legally binding)