A floor cleaning machine (l) having a base and an operating bar , wherein the base has a cleaning element arrangement with at least one driven cleaning element on which at least one engagement element is provided, wherein the cleaning element (33 61) is designed to engage with a floor surface to be cleaned by means of the at least one engagement element provided thereon, wherein the operating bar extends along a longitudinal axis between a proximal end and a actuation end and is pivotably attached to the base via a joint such that the operating bar is pivotable in any direction relative to the base , wherein the joint has a first joint element whose envelope is spherical shell-shaped, and a second joint element , wherein the first joint element is received in the second joint element and supported therein in such a way that the first joint element is pivotable relative to the second joint element about a pivot point fixed in relation to the second joint element and which coincides with the center of the envelope, and that the center of the envelope is non-displaceable relative to the second joint element , characterized in that at least two grooves extending in the form of a circular segment are provided on one of the first and second joint elements , which are open towards the envelope and extend along the envelope, and at least one first engagement part and one second engagement part are provided on the other of the first and second joint elements , wherein the first engagement part extends into the first of the grooves and the second engagement part extends into the second of the grooves , wherein the first joint element is attached to one of the base and the proximal end of the operating bar and the second joint element is attached to the other of the base and the proximal end of the operating bar . a base and an operating bar , wherein the base has a cleaning element arrangement with at least one driven cleaning element on which at least one engagement element is provided, wherein the cleaning element (33 61) is designed to engage with a floor surface to be cleaned by means of the at least one engagement element provided thereon, wherein the operating bar extends along a longitudinal axis between a proximal end and a actuation end and is pivotably attached to the base via a joint such that the operating bar is pivotable in any direction relative to the base , wherein the joint has a first joint element whose envelope is spherical shell-shaped, and a second joint element , wherein the first joint element is received in the second joint element and supported therein in such a way that the first joint element is pivotable relative to the second joint element about a pivot point fixed in relation to the second joint element and which coincides with the center of the envelope, and that the center of the envelope is non-displaceable relative to the second joint element , characterized in that at least two grooves extending in the form of a circular segment are provided on one of the first and second joint elements , which are open towards the envelope and extend along the envelope, and at least one first engagement part and one second engagement part are provided on the other of the first and second joint elements , wherein the first engagement part extends into the first of the grooves and the second engagement part extends into the second of the grooves , wherein the first joint element is attached to one of the base and the proximal end of the operating bar and the second joint element is attached to the other of the base and the proximal end of the operating bar . <EOS>