Improvements introduced in the manufacture of change of speed by chain safety in combined elements of plastic and metal material for two-wheel vehicles. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the manufacture of speed changes by chain derailment in combined elements of plastic and metal for two-wheeled vehicles, characterized by comprising upper and lower articulation supports, made of plastic material, with a closed part that forms a box , and a flange whose transverse sides allow articulation of the ends of the levers also profiled from plastic material, the assembly constituting a deformable parallelogram. (Machine-translation by Google Translate, not legally binding)