least partially along the windshield wiper arm said windshield wiper is characterized in that the connecting device is built into the arm blade connector so as to automatically connect the spraying device to the delivery channel when connecting the windshield wiper blade onto the windshield wiper arm and so as to automatically detach the spraying device from the delivery channel when disconnecting the windshield wiper blade from the windshield wiper arm application_number US 201013574017 A description the following detailed description illustrates the claimed invention by way of example and not by way of limitation the description clearly enables one skilled in the art to make and use the disclosure describes several embodiments adaptations variations alternatives and uses of the disclosure including what is presently believed to be the best mode of carrying out the claimed invention additionally it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings the disclosure is capable of other embodiments and of being practiced or being carried out in various ways also it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting one of the main goals of the present invention is to be able to connect and disconnect a windshield wiper blade equipped with a projection device such as for instance a washing ramp in one single simple reliable and robust manual operation instead of two operations to this end starting from an arm blade quick coupling as shown in fig3 similar to the one shown in fig1 a and 1 b the concept includes integrating a coupling.