Surface cleaning apparatus

1. A hand vacuum cleaner having a front end having a dirty air inlet, a rear end, an upper end and a lower end, the hand vacuum cleaner comprising:

(a) an upstream air treatment stage comprising a front end, a rear end, a longitudinal axis extending between the front and rear ends of the upstream air treatment stage and an upstream air treatment chamber having an upstream air treatment chamber air inlet and an upstream air treatment chamber air outlet, wherein dirt is separated in the upstream air treatment chamber from an air stream as the air stream travels from the upstream air treatment chamber air inlet to the upstream air treatment chamber air outlet; and,

(b) a downstream air treatment stage, the downstream air treatment stage comprising a front end, a rear end, a downstream air treatment chamber and a downstream dirt collection chamber that is exterior to the downstream air treatment member, the downstream air treatment chamber comprising a front end, a rear end and a dirt outlet, wherein the air stream passes through the downstream air treatment chamber after passing through the upstream air treatment chamber and additional dirt is separated in downstream air treatment chamber and at least some of the additional dirt is collected in the downstream dirt collection chamber,

wherein the downstream air treatment chamber is positioned rearward of the upstream air treatment chamber and

wherein the downstream dirt collection chamber has a rear end wall that is located at an intermediate location between the front and rear ends of the downstream air treatment chamber and

wherein the downstream dirt collection chamber extends forward of the downstream air treatment chamber to a location that is forward of the rear end of the upstream air treatment stage.

2. The hand vacuum cleaner of claim 1 wherein the downstream dirt collection chamber extends forward of the downstream air treatment chamber to a location that is forward of a rear end of the upstream air treatment chamber.

3. The hand vacuum cleaner of claim 1 wherein the downstream dirt collection chamber extends forward of the downstream air treatment chamber to a front end of the upstream air treatment chamber.

4. The hand vacuum cleaner of claim 1 wherein the downstream dirt collection chamber and the upstream air treatment chamber are concurrently openable.

5. The hand vacuum cleaner of claim 4 wherein the front end of the upstream air treatment stage is openable wherein, when the front end is opened, the downstream dirt collection chamber and the upstream air treatment chamber are concurrently opened.

6. The hand vacuum cleaner of claim 1 wherein a plane that is transverse to the longitudinal axis extends through the upstream air treatment chamber and the downstream dirt collection chamber.

7. The hand vacuum cleaner of claim 1 wherein the dirty air inlet is located at the upper end of the hand vacuum cleaner and, when the longitudinal axis extends horizontally with the upper end of the hand vacuum cleaner above the lower end of the hand vacuum cleaner, the downstream dirt collection chamber underlies the upstream air treatment chamber.

8. The hand vacuum cleaner of claim 1 wherein the upstream air treatment chamber has a sidewall located between the front end of the upstream air treatment stage and the rear end of the upstream air treatment stage and the sidewall forms part of the downstream dirt collection chamber.

9. The hand vacuum cleaner of claim 1 wherein the downstream air treatment chamber comprises a second stage cyclone chamber.

10. The hand vacuum cleaner of claim 9 wherein the upstream air treatment chamber comprises a first stage cyclone chamber.

11. The hand vacuum cleaner of claim 1 wherein the upstream air treatment chamber comprises a first stage cyclone chamber and the upstream air treatment stage further comprises a first stage dirt collection chamber that is exterior to the first stage cyclone chamber.

12. The hand vacuum cleaner of claim 1 wherein the upstream air treatment stage has an upstream diameter in a plane that is transverse to the longitudinal axis and the downstream air treatment stage has a downstream diameter in a plane that is transverse to the longitudinal axis and the downstream diameter is comparable to the upstream diameter.

13. The hand vacuum cleaner of claim 1 wherein the upstream air treatment stage has an upstream diameter in a plane that is transverse to the longitudinal axis and the downstream air treatment stage has a downstream diameter in a plane that is transverse to the longitudinal axis and the downstream diameter is equal to the upstream diameter.

14. The hand vacuum cleaner of claim 1 further comprising a pre-motor filter that is positioned rearward of the downstream air treatment stage.

15. The hand vacuum cleaner of claim 14 wherein the pre-motor filter has a filter diameter in a plane that is transverse to the longitudinal axis and the downstream air treatment stage has a downstream diameter in a plane that is transverse to the longitudinal axis and the downstream diameter is comparable to the filter diameter.

16. The hand vacuum cleaner of claim 14 further comprising a suction motor that is positioned rearward of the pre-motor filter.

17. A hand vacuum cleaner having a front end having a dirty air inlet, a rear end, an upper end and a lower end, the hand vacuum cleaner comprising:

(a) an upstream air treatment stage comprising a front end, a rear end, a longitudinal axis extending between the front and rear ends of the upstream air treatment stage and an upstream air treatment chamber having an upstream air treatment chamber air inlet and an upstream air treatment chamber air outlet, wherein dirt is separated in the upstream air treatment chamber from an air stream as the air stream travels from the upstream air treatment chamber air inlet to the upstream air treatment chamber air outlet; and,

(b) a downstream air treatment stage, the downstream air treatment stage comprising a front end, a rear end, a downstream air treatment chamber and a downstream dirt collection chamber that is exterior to the downstream air treatment member, the downstream air treatment chamber comprising a sidewall extending rearwardly from a front end of the downstream air treatment chamber to a rear end of the downstream air treatment chamber with a dirt outlet provided in the sidewall, wherein the air stream passes through the downstream air treatment chamber after passing through the upstream air treatment chamber and additional dirt is separated in downstream air treatment chamber and at least some of the additional dirt is collected in the downstream dirt collection chamber,

wherein the downstream air treatment chamber is positioned rearward of the upstream air treatment chamber and,

wherein the dirty air inlet is located at the upper end of the hand vacuum cleaner and,

when the longitudinal axis extends horizontally with the upper end of the hand vacuum cleaner above the lower end of the hand vacuum cleaner, the downstream dirt collection chamber underlies the upstream air treatment chamber.

18. The hand vacuum cleaner of claim 17 wherein a plane that is transverse to the longitudinal axis extends through the upstream air treatment chamber and the downstream dirt collection chamber.

19. The hand vacuum cleaner of claim 18 wherein the downstream dirt collection chamber extends to a front end of the upstream air treatment chamber.

20. The hand vacuum cleaner of claim 16 wherein the front end of the upstream air treatment stage is openable wherein, when the front end is opened, the downstream dirt collection chamber and the upstream air treatment chamber are concurrently opened.