u shaped fig4 each of its two resilient flanges 7 being provided at its lower internal portion with a hook 5 the mounting of part 3 onto the central portion 12a of the first yoke 1 fig1 3 is executed by pushing it downwards as indicated by arrow 34 a 34 until said two hooks 5 snap into the corresponding notches 10 provided at the lower portion of the two flanges 11 of the first yoke 1 at this moment the internal surface of the web of part 3 rests on the central portion 12a of the web 12 of the yoke 1 which has a substantially u shaped transverse section in order to facilitate the mounting of part 3 onto the yoke 1 the lower portion of the two flanges 7 may be provided with inclined surfaces 6 fig4 fig3 shows part 3 rigidly mounted on the yoke 1 on this figure it can be seen that said part 3 has the general form of a cylinder the two extremities 7 of which slightly projecting from the two corresponding flanges 11 of the yoke 1 as will be shown later on it is these two extremities or flanges 7 which act as pivot axis between the two yokes 1 2 of the wiper.