Adaptive suspension for rotary cleaning machine

1. A rotary cleaning machine comprising a rotating cleaning head, the rotating cleaning head comprising:

a hub member having a base, an outer peripheral wall defining a chamber therein, and a support extending upwardly from the base and configured to receive a drive shaft;

a plurality of nozzles configured to spray a cleaning fluid, the plurality of nozzles extending from a lower side of the base of the hub;

a plurality of suction shoes configured to aspire the cleaning fluid from a surface to be treated;

a plurality of conduits fluidly connecting the suction shoes with the hub member; and

an adaptive suspension comprising,

a hub ring supporting the hub member,

a plurality of rigid arms radially extending from the hub ring, each of the rigid arms having a proximal end that is rotatably connected to the hub ring and a distal end that is rotatably connected to a suction shoe; and

a plurality of flexing arms radially extending from the hub ring, each of the flexing arms having a proximal end that is rotatably connected to the hub ring at a substantially same angular position as one of the rigid arms and a distal end that is connected to the one of the rigid arms at a radial distance from the proximal end of the one of the rigid arms,

whereby the adaptive suspension enables independent upward and downward movements of the suction shoes over uneven portions of the surface to be treated.

2. The rotary cleaning machine according to claim 1 , wherein the hub ring comprises an inwardly directed flange that supports the hub member and a plurality of recesses that are defined between pairs of the rigid arms and that receive the conduits.

3. The rotary cleaning machine according to claim 1 , wherein a rigid arm selected from the plurality of rigid arms is X-shaped and has apertures that are defined at the proximal and distal ends thereof and that each receive a pivot.

4. The rotary cleaning machine according to claim 3 , wherein the X-shaped rigid arm comprises a plurality of outwardly convex segments.

5. The rotary cleaning machine according to claim 1 , wherein a flexing arm selected from the plurality of flexing arms comprises an inner and an outer member that are rotatably connected to one another at an intermediate junction point, and a biasing member disposed between the proximal end and the intermediate junction point of the flexing arm.

6. The rotary cleaning machine according to claim 5 , wherein the inner and the outer member are radially aligned.

7. The rotary cleaning machine according to claim 5 , wherein a rigid arm selected from the plurality of rigid arms has an X shape, and wherein the distal end of the flexing arm is connected to a crossover point of the X shape.

8. The rotary cleaning machine according to claim 7 , wherein the inner member of the flexing arm has a proximal end that is pivotally connected to the hub ring at a position above the proximal end of the rigid am and a distal end pivotally connected to a proximal end of the outer member at the intermediate junction point, and wherein the outer member of the flexing arm has a distal end fixedly connected below the crossover point of the X shape.

9. The rotary cleaning machine according to claim 8 , wherein the inner and the outer member of the flexing arm are dimensioned to cause the inner member to have the proximal end above the rigid arm and the distal end below the rigid arm when the adaptive suspension is disposed on a flat surface, thereby causing the intermediate junction point to be disposed below the rigid arm.

10. The rotary cleaning machine according to claim 8 , wherein the outer member of the flexing arm is J-shaped with an outermost portion that is upwardly concave.