Autonomous surface treating appliance

1. An autonomous surface treating appliance comprising a main body having an external surface defining an outer plan profile of the appliance, and having a drive arrangement mounted inboard of the outer plan profile of the main body and configured to propel the appliance in a direction of movement across a surface to be cleaned, a surface treating assembly associated with the main body and carried transversely to the direction of movement, the surface treating assembly being generally elongate in form and comprising a housing defining a suction opening, the housing comprising a middle portion positioned substantially within said main body and ends having side edges extending tangentially from respective sides of a substantially circular outer plan profile of the main body, wherein the ends extend through respective openings in the sides of the external surface of the main body.

2. The surface treating appliance of claim 1 , wherein the surface treating assembly extends transversely across a rear portion of the main body with respect to a forward direction of travel.

3. The surface treating appliance of claim 1 , wherein the surface treating assembly is located behind the drive arrangement with respect to a forward direction of travel.

4. The surface treating appliance of claim 1 , wherein the main body includes a chassis, wherein the surface treating assembly is provided on the chassis.

5. The surface treating appliance of claim 4 , wherein the surface treating assembly is integral to the chassis.

6. The surface treating appliance of claim 4 , wherein the chassis defines an elongate sole plate extending forward of the surface treating assembly along a longitudinal axis of the surface treating appliance.

7. The surface treating appliance of claim 4 , wherein the chassis further includes first and second side recesses, and wherein the drive arrangement includes first and second traction units, a respective one of which is receivable in the respective first and second side recesses of the chassis.

8. The surface treating appliance of claim 4 , wherein the appliance further comprises a power source operatively connected to a suction generator operable to draw air from a dirty air inlet of the surface treating assembly into a removable dirt and dust separating apparatus.

9. The surface treating appliance of claim 8 , wherein the main body includes a front portion defining an open platform within which the removable dirt separating apparatus is receivable.

10. The surface treating appliance of claim 8 , wherein the dirt separating apparatus is substantially cylindrical and defines an axis extending substantially parallel to a cylindrical axis of the main body.

11. The surface treating appliance of claim 8 , wherein the dirt separating apparatus is a cyclonic dirt separating apparatus.

12. The surface treating appliance of claim 8 , wherein a portion of the dirt separating apparatus forms part of the outer plan profile of the appliance.

13. The surface treating appliance of claim 12 , wherein a portion of the dirt separating apparatus protrudes beyond a front portion of the main body in the direction of movement.

14. The surface treating appliance of claim 8 , wherein the main body includes a body portion mounted on the chassis and movable relative thereto.

15. The surface treating appliance of claim 14 , wherein the power source, the suction generator and the dirt separating apparatus are mounted to the body portion.

16. The surface treating appliance of claim 14 , wherein a curved duct extends between the surface treating assembly provided on the chassis and an outlet port defined in the open platform of the body portion, the outlet port being adapted for engagement with a respective inlet port provided on the dirt and dust separating apparatus.