Abstract: This device comprises a cleaning head (1) being fitted with an alternately suctioning valve arrangement and provided with an elastic sliding base (2) being freely rotatable in its plane. A characterizing feature of this device lies in the fact that the valve arrangement comprises a freely moving, ball-shaped valve member (3) and a second valve member being formed by a piston (6) with a Venturi arrangement. These two valve members are related to each other by means of an articulated shaft (9 and 10) and are thus fit to alternately act on the main suction pipe (5) and on the tubular attachment (7) being laterally connected to the main pipe. An also characterizing feature lies in the fact that the sliding base (2) has a generally triangular shape as well as transversal folds (14) being provided in the corner regions (13) and an upwardly extending skirt (15) being provided around its periphery.