the cleaning device represented in the drawings comprises a dome - shaped housing 1 open at the bottom , in which two identically formed brush rollers 2 , 3 spaced from one another are rotatably mounted around axes of rotation that extend parallel to one another . the brush rollers are actuated so as to rotate in opposite directions via a drive 4 and suitable transmission means , in the exemplified embodiment represented via driving belts 5 , 6 . the manner of mounting the brush rollers 2 , 3 is not represented in closer detail in the drawings , as here a conventional method is involved . for this bearings can be disposed on a special frame or on the housing , and in the context of this application all these parts which mount the brush rollers 2 , 3 are generally designated as “ frame ”. on the upper side of the housing , in the centre between the two brush rollers 2 and 3 and in the direct vicinity of a side edge 7 of the housing 1 there acts a push handle 8 , which , in a manner not evident in further detail from the drawings , is connected to the housing 1 in fixed manner for rotation around an axis which extends parallel to the axes of rotation of the brush rollers 2 , 3 . however the push handle 8 can be swivelled both around a horizontal swivel axis and also around a vertical swivel axis , which both stand perpendicularly on the axes of rotation of the brush rollers 2 , 3 . the swivelling around the horizontal swivel axis results in that the push handle 8 can be swivelled with respect to the plane fixed by the two brush rollers 2 , 3 into a different angle of inclination , by suitable means , not represented in the drawings , the push handle may if required be fixed in different angular positions . a swivelling of the push handle 8 around the vertical swivel axis results in that the push handle 8 can be swivelled out of a position in which it extends in the direction of the axes of rotation of the brush rollers 2 , 3 ( in fig2 with solid lines ) into a position in which it extends at right angles to the axis of rotation of the brush rollers 2 , 3 ( in fig2 represented by dot - dash lines ). here too suitable means can be provided to fix the push handle in both described positions . in the position in which the push handle extends at right angles to the axis of rotation of the brush rollers 2 , 3 ( in dot - dash lines in fig2 ), the housing 1 can be displaced by applying pushing and pulling forces , while both brush rollers 2 and 3 press with forces of equal magnitude on a surface 9 to be cleaned . if the push handle 8 is swivelled into a position in which it extends in the direction of the axes of rotation of the brush rollers 2 , 2 ( solid lines in fig2 ), via the push handle 8 a turning moment can be exerted on the housing 1 , so that the housing 1 can be tilted . the axis of this tilting runs parallel to the axes of rotation of the brush rollers 2 and 3 and lies between them . to be able to carry out such a tilting of the housing 1 , at its free end the push handle 8 has a crossbar 10 , which is connected to the housing 1 via a bar - shaped portion 11 in the described manner and which at its two ends bears handle elements 12 , 13 that are spaced from one another . by forcing one of the two handle elements 12 or 13 downwards the housing 1 is tilted in such a manner that one brush roller is pressed securely against the surface to be cleaned 9 , while the other is raised from it . this is represented in fig3 and 4 for different tilting directions . since the brush rollers are actuated to rotate reciprocally , this results in that in each case the brush roller which is more forcefully pressed transmits its rotational movement more strongly to the surface 9 than the brush roller raised from the surface 9 , and this results in a displacement of the housing 1 in relation to the surface 9 . the displacement is produced just on the basis of the titling , the user therefore only has to apply the forces for the titling to achieve a displacement of the housing 1 , the actual displacement movement is produced by the drive 4 . by pressing alternately on the handle elements 12 and 13 the housing 1 can consequently be alternately tilted in the one or the other direction , and this results in an alternate displacement of the housing 1 in the one direction or in the other direction . by swivelling the push handle around the vertical swivel axis , the user can choose at any time whether he wants to move the housing 1 in the conventional manner by pushing and pulling or whether he wants to trigger the displacement movement of the housing just by tilting the housing and then wishes to carry it out by the drive of the device . represented in fig5 and 6 is a modified exemplified embodiment of a cleaning device , which is essentially constructed in the same manner as that of fig1 to 4 . identical parts therefore have the same reference numbers . in contrast to the exemplified embodiment of fig1 to 4 , in the case of the cleaning device of fig5 and 6 the push handle 8 is divided in its centre into a lower portion 14 and an upper portion 15 , which are swivellably connected to one another around an axis extending at right angles to the longitudinal axis of the push handle 8 . the two portions 14 and 15 can be locked in relation to one another by a suitable device , which is not specified in further detail in the drawings , so that a swivelling of the portions 14 and 15 in relation to one another is not possible . in its mounting on the housing 1 , the push handle 8 can swivel around another axis which runs parallel to the swivel axis of the portions 14 and 15 and can also be fixed if required . by this embodiment it is possible to accommodate the push handle 8 in a space - saving manner on the upper side of the housing 1 , when the device is not in operation . for this the lower portion 14 is swivelled parallel to the upper side of the housing 1 , the upper portion is folded by 180 ° in relation to the lower portion 14 and also laid down on the upper side of the housing , as can be seen from fig5 . as a result a very compact folding together of the push handle on the upper side of the housing is produced .
in order to facilitate moving with a cleaner comprised , on one side , of two parallel brush - rollers secured to a frame and actuated so as to rotate in opposite directions and , on the other side , of a push bar attached to the frame , it is suggested by the invention that the push bar be fixed at a distance from the frame in the direction of the rotating axis of the brush - rollers and rotationally fixed to the frame to enable a rotation following a cycle parallel to the axis of rotation .