Split pulley

In an arrangement provided with a substantially cylindrical rotatable shaft having pins at the ends of said shaft for supporting the same, the improvement comprising:

• spaced integral flanges on said shaft, two diametrically opposed plane surfaces on said shaft positioned between said flanges, a driving pulley, corresponding profile surfaces on the inside of the driving pulley for effecting non-rotatable connection between said shaft and said driving pulley, said driving pulley constituting a unit with said shaft and including two identical semicircular portions which are mounted on said shaft between said flanges, and said flanges being provided with notches on surfaces thereof facing each other, and protruding elements formed on the inner side walls of said portions which are adapted to snap into said notches during assembly of the driving pulley on said shaft.