moved relative to the upper part 18 supported on the wiper arm 12 by u2212 5 degrees with regard to the horizontal the pendulum motion of the slider 20 in the upper part 18 is limited by the stops 42 which are provided on the arms 30 of the upper part 18 the adapter 16 has if the upper part 18 is connected to the slider 20 a substantially rectangular design cf fig5 to receive this rectangular adapter 16 a receiver 36 is provided in a front end region of the wiper arm 12 wherein the wiper arm 12 likewise has a u profile in cross section in the region of the receiver 36 a back 38 and arms 40 of the receiver 36 encompass the adapter 16 received in the receiver 36 cf fig8 this ensures that no tipping occurs within the receiver 36 during the movement of the slider 20 relative to the upper part 18 likewise a detaching of the wiper blade 14 from the wiper arm 12 is prevented by the cage like geometry of the receiver 36 in particular it is evident from fig2 that protrusions in the form of bars 44 46 project inwardly from the arms 40 of the receiver 36 of the wiper arm 12 the bars 46 that are closer to a free end of the wiper arm 12 so the front bars serve for the rear engagement for a fixed abutment of the upper part 18 which is provided on the upper part 18 in the form of a step.