Floor cleaning machine

Abstract

A floor cleaning machine having a cleaning element arrangement with inner and outer cleaning elements that include inner and outer cleaning bodies, respectively, that extend jointly in the cleaning body plane and have first and second receiving openings, respectively. The inner and outer cleaning elements extend from the inner and outer cleaning bodies, respectively, away from the cleaning body plane to one side thereof. The inner cleaning body is arranged in the second receiving opening. The output shaft extends with an output shaft section into both the first and second receiving openings. First and second eccentric elements are attached to the output shaft section and to the inner and outer cleaning bodies, respectively, so that when the output shaft is rotated, the inner and outer cleaning bodies perform eccentric movements that are phase-shifted with respect to one another.

1 . A floor cleaning machine comprising:
 a base, and   a cleaning element arrangement, held on an underside of the base, the cleaning element arrangement being configured for engagement with a floor surface, and   a drive motor having an output shaft for driving the cleaning element arrangement, wherein the output shaft is drivable in rotation by the drive motor and extends along an output axis,   wherein the cleaning element arrangement comprises an inner cleaning element and an outer cleaning element that is arranged externally around the inner cleaning element,   wherein the inner and outer cleaning elements are drivable in such a way that each of the inner and outer cleaning elements performs an eccentric movement
 in which, when viewed perpendicularly to a cleaning body plane, each point of each of the inner and outer cleaning elements moves substantially circularly about an axis which runs parallel to the output axis, 
 in which the axes for points which do not coincide, when viewed perpendicularly to the cleaning body plane, are different from one another, and 
 in which, for one cleaning element, all points move in one direction of movement at any point in time, when viewed perpendicularly to the cleaning body plane, 
   wherein the eccentric movements of the inner cleaning element and of the outer cleaning element are phase-shifted with respect to one another in such a way that, when viewed perpendicularly to the cleaning body plane, the direction of movement of the points of the inner cleaning element is different at any point in time from the direction of movement of the points of the outer cleaning element, wherein the inner cleaning element has an inner cleaning body and   the outer cleaning element has an outer cleaning body, wherein the cleaning bodies extend jointly in the cleaning body plane, and wherein engagement elements extend from the cleaning bodies away from the cleaning body plane to one side thereof,   wherein the inner cleaning body has a first receiving opening and the outer cleaning body has a second receiving opening, wherein the inner cleaning body is arranged in the second receiving opening,   wherein the output shaft extends with an output shaft section into the first and second receiving openings,   wherein a first eccentric element is attached to the output shaft section and is connected to the inner cleaning body in such a way that, when the output shaft is rotated, the inner cleaning body performs the eccentric movement, and   wherein a second eccentric element is attached to the output shaft section and is connected to the outer cleaning body in such a way that, when the output shaft is rotated, the outer cleaning body performs the eccentric movement.   
     
     
         2 . The floor cleaning machine of  claim 1 , further comprising an autonomously or manually controlled driven chassis for movement over the floor surface to be cleaned,
 wherein the base is held on the chassis.   
     
     
         3 . The floor cleaning machine of  claim 1 , further having an operating bar, attached to the base, for guiding and actuating the floor cleaning machine. 
     
     
         4 . The floor cleaning machine of  claim 3 , wherein the operating bar extends along a longitudinal axis and is pivotably attached to the base via a joint in such a way that it can be pivoted in any direction relative to the base,
 wherein the joint is configured in such a way that a torque is exerted on the base when the operating bar is rotated about its longitudinal axis, said torque being oriented in such a way as to cause the base to rotate about a vertical axis which runs perpendicularly to the cleaning plane.   
     
     
         5 . The floor cleaning machine of  claim 1 , wherein the first eccentric element has a first eccentric disc, which is connected for conjoint rotation to the output shaft section and to an outer circumference of which a first receiving element is attached in such a way that it can be rotated with respect to the first eccentric disc about a first axis of rotation, which runs parallel to the output axis and is arranged at a distance from the latter, wherein the first receiving element is secured on the inner cleaning body, and
 wherein the second eccentric element has a second eccentric disc, which is connected for conjoint rotation to the output shaft section, and to the outer circumference of which a second receiving element is attached in such a way that it can be rotated with respect to the second eccentric disc about a second axis of rotation, which runs parallel to the output axis and is arranged at a distance from the latter, wherein the second receiving element is secured on the outer cleaning body.   
     
     
         6 . The floor cleaning machine of  claim 5 , wherein the first and the second eccentric discs are arranged one behind the other on the output shaft section when viewed along the output axis and are connected thereto. 
     
     
         7 . The floor cleaning machine of  claim 1 , wherein the output shaft section extends over a region of the output shaft in which a projection of the inner or outer cleaning body onto the output shaft falls. 
     
     
         8 . The floor cleaning machine of  claim 1 , wherein, when viewed in the axial direction of the output shaft, the first eccentric element and the second eccentric element are arranged in a region of the output shaft in which a projection of the inner or outer cleaning body onto the output shaft falls. 
     
     
         9 . The floor cleaning machine of  claim 1 , wherein a projection of the inner cleaning body onto the output shaft at least partially overlaps a projection of the outer cleaning body onto the output shaft. 
     
     
         10 . The floor cleaning machine of  claim 1 , wherein a drive motor holding element, to which the drive motor is fixedly attached, is provided on the base,
 wherein first elastic elements are provided, which are fixedly connected to the inner cleaning body and to the drive motor holding element, and   wherein second elastic elements are provided, which are fixedly connected to the outer cleaning body and to the drive motor holding element.   
     
     
         11 . The floor cleaning machine of  claim 10 , wherein the drive motor holding element is held on the base in such a way as to be movable. 
     
     
         12 . The floor cleaning machine of  claim 1 , wherein guide wheels, which are rotatable about a common wheel axis, are held on the base. 
     
     
         13 . The floor cleaning machine of  claim 24 , wherein the wheel axis and the pivot axis run parallel to one another. 
     
     
         14 . The floor cleaning machine of  claim 1 , wherein the eccentric movement of the inner cleaning element is phase-shifted by 180° with respect to the eccentric movement of the outer cleaning element, with the result that, when viewed perpendicularly to the cleaning body plane, the direction of movement of the points of the inner cleaning element is opposite to the direction of movement of the points of the outer cleaning element at any point in time. 
     
     
         15 . The floor cleaning machine of  claim 5 , wherein the output axis, the first axis of rotation and the second axis of rotation run in a common plane. 
     
     
         16 . The floor cleaning machine of  claim 1 , wherein the inner cleaning element and the outer cleaning element are configured in such a way that their masses are equal, and/or
 wherein the inner cleaning element and the outer cleaning element have engagement surfaces of the same size by means of which the cleaning elements engage with the floor surface.   
     
     
         17 . The floor cleaning machine of  claim 1 , wherein the outer cleaning element has a triangular outer contour in the cleaning body plane. 
     
     
         18 . The floor cleaning machine of claim  0 , wherein the sides of the triangular outer contour of the outer cleaning element are of convex design. 
     
     
         19 . The floor cleaning machine of  claim 1 , wherein the second receiving opening has a triangular inner contour in the cleaning body plane, and
 wherein the inner cleaning element has a triangular outer contour in the cleaning body plane.   
     
     
         20 . The floor cleaning machine of  claim 1 , wherein the inner cleaning element and the outer cleaning element have bristles pointing towards the floor surface as engagement elements,
 wherein the bristles of the inner cleaning element comprise a first group of bristles and wherein a subset of the first group of bristles is arranged uniformly inclined in a first direction with respect to the output axis, while the bristles of the first group which are not included in said subset extend parallel to the output axis,   and/or   wherein the bristles of the outer cleaning element comprise a second group of bristles and wherein a subset of the second group of bristles is arranged uniformly inclined in a first direction with respect to the output axis, while the bristles of the second group which are not included in said subset extend parallel to the output axis.   
     
     
         21 . The floor cleaning machine of  claim 1 , having a cleaning liquid container coupled to the base,
 wherein a cleaning fluid dispensing system is provided on the base and which is connected to the cleaning liquid container, the cleaning fluid dispensing system being configured to apply cleaning liquid from the cleaning liquid container to a floor surface on which the floor cleaning machine is arranged.   
     
     
         22 . The floor cleaning machine of  claim 1 , having a suction foot coupled to the base that is configured for sucking up cleaning liquid from the floor surface. 
     
     
         23 . The floor cleaning machine of  claim 22 , wherein a suction device is coupled to the base, which suction device acts on the suction foot with a suction air flow. 
     
     
         24 . The floor cleaning machine of  claim 11 , wherein the drive motor holding element is pivotable relative to the base about a pivot axis that runs parallel to the cleaning body plane. 
     
     
         25 . The floor cleaning machine of  claim 22 , further having an operating bar, attached to the base, for guiding and actuating the floor cleaning machine, and wherein the suction foot is attached to the operating bar. 
     
     
         26 . The floor cleaning machine of  claim 23 , further having an operating bar, attached to the base, for guiding and actuating the floor cleaning machine, and wherein the suction foot is attached to the operating bar.