windshield wiper
Rubber squeegee, usually mounted in a pair; it is activated by a motor and cleans the windshield.
windshield wiper blade 
Metal part supporting the wiper through the actions of two small connecting rods.
articulation 
Assembly enabling the blade to pivot on the end of the arm so that it adapts to the curvature of the windshield.
wiper arm 
Metal rod with a to-and-fro motion that exerts a uniform pressure on the blade attached to it.
fluted shaft 
Part driven by an electric motor, whose rotating motion it converts into alternating motion through two connecting rods.