Flexible link 1 runs over fixed pulley 4 and pulley 3 which rotates freely on wiper arm 2. Wiper arm 2 is oscillated by tie-rod 5 from a drive (not shown). Rigidly attached to pulley 3 is rod a on which the wiper blade is mounted. When arm 2 oscillates, pulley 3 together with rod a and the blade turns alternately in both directions.
$1858$FL,4L$