Nozzle construction for a cleaning head

1. A surface cleaning head for a vacuum cleaner for cleaning a surface comprising:

(a) a front end, a rear end and sides extending between the front end and the rear end;

(b) an enclosed air flow passage extending from an opening to an air outlet;

(c) a plurality of wheels having a lower end; and,

(d) an airflow chamber upstream of the opening comprising:

(i) an upper wall;

(ii) a rear depending wall extending downwardly from the upper wall, the rear depending wall having a lower end that is positioned above the lower end of the wheels; and,

(iii) the upper wall and the rear depending wall defining an air flow chamber, having an open lower end whereby the surface is visible from the upper wall when the surface cleaning head is placed on the surface and the opening to the enclosed air flow passage is provided in a rear half of the upper wall of the air flow chamber forwardly of the rear depending wall and inwardly of the sides, the opening having a rearward end, and the open lower end extends from the front end to at least the rearward end of the opening.

2. The surface cleaning head of claim 1 further comprising side depending walls.

3. The surface cleaning head of claim 2 wherein the rear depending wall and the side depending walls form a generally U-shaped air flow chamber wall.

4. The surface cleaning head of claim 2 wherein the side depending walls have a lower end that is spaced above the lower end of the wheels.

5. The surface cleaning head of claim 1 wherein the opening is in the upper wall.

6. The surface cleaning head of claim 1 wherein the airflow chamber has an absence of agitation members and air jet members.

7. The surface cleaning head of claim 1 wherein the airflow chamber extends to the front end of the surface cleaning head and a dirty air inlet is positioned at the front end of the surface cleaning head.

8. The surface cleaning head of claim 1 wherein the opening faces the surface to be cleaned when the surface cleaning head is positioned on the surface to be cleaned.

9. The surface cleaning head of claim 8 wherein the opening is in communication with a passage that extends generally vertically upwardly.

10. The surface cleaning head of claim 8 wherein the opening is in communication with a passage that extends generally vertically upwardly.

11. The surface cleaning head of claim 1 wherein the lower end of the depending walls is spaced from 0.01 to 0.175 inches above the lower end of the wheels.

12. The surface cleaning head of claim 1 wherein the lower end of the depending walls is spaced from 0.08 to 0.08 inches above the lower end of the wheels.

13. The surface cleaning head of claim 2 wherein the surface cleaning head has a longitudinal axis and a transverse width, the opening is spaced transversely inwardly from the side walls by a distance, the opening has a transverse width, and the distance is from 1 to 5 times the transverse width.

14. The surface cleaning head of claim 12 wherein the opening has a longitudinal length and is positioned rearwardly from the front end by at least a distance equal to the longitudinal length.

15. The surface cleaning head of claim 1 wherein the cleaning head is part of a hand vacuum cleaner.

16. A hand vacuum cleaner including the surface cleaning head of claim 1 .

17. The surface cleaning head of claim 1 wherein the downwardly depending wall is generally U-shaped when viewed from below, the U-shape having a forwardly positioned open end, and a dirty air inlet is defined at the open end of the U-shape.

18. The surface cleaning head of claim 1 wherein the depending wall is rearwardly narrowing.

19. The surface cleaning head of claim 17 wherein the dirty air inlet has the shape of a vertically extending generally rectangular, wide, shallow slot.