Abstract: Disclosed is a wiping device having a support member which is mounted for oscillating about an axis. A blind passage is formed in the support member in a direction transverse to the axis. A wiper arm supporting at its free end a wiper blade holder, is inserted at its other end into the elongated passage of the support member so as to be rotatable about its axis and to be displaceable in axial direction. A spring-biassed locking member, for example in the form of a pyramidal plug is attached to the end of the wiper arm in a passage and is urged into a matching recess to hold the wiper arm in a working position or when the wiper arm in the plug is displaced from the locking socket to permit the rotation of the wiper blade holder about the axis of the wiper arm.