Floor cleaning machine

A floor cleaning machine comprising:

• a base, and
• an operating bar,
• wherein the base has a cleaning element arrangement with at least one driven cleaning element, on which engagement elements are provided,
• wherein the cleaning element is configured to engage, by means of the engagement elements provided thereon, with a floor surface to be cleaned, with the result that, when they engage with the floor surface, free ends of the engagement elements are arranged in a cleaning plane,
• wherein the operating bar extends along a longitudinal axis between a proximal end and an actuating end and is pivotably attached to the base via a joint in such a way that it can be pivoted in any desired 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 pivot about a vertical axis which runs perpendicularly to the cleaning plane,
• wherein the joint comprises
• a sleeve-shaped bellows, which extends between a first and a second end, the first end of which is connected to the base and the second end of which is connected to the operating bar,
• a first supporting element, which is arranged inside the bellows and is attached to the base, pointing away therefrom, and
• a second supporting element, which is arranged inside the bellows and is attached to the proximal end of the operating bar, pointing away therefrom,
• wherein the free end of one of the first and second supporting elements has a convex spherical shell-shaped projection and the free end of the other of the first and second supporting elements has a concave spherical shell-shaped receiving recess, and
• wherein the receiving recess is designed to receive the projection and to guide it for a pivoting movement.