Portable surface cleaning apparatus

1. A hand vacuum cleaner comprising:

(a) an air flow passage extending from a dirty air inlet to a clean air outlet;

(b) a cleaner body housing having a rear end and a front end;

(c) a suction motor positioned in the air flow passage, the suction motor having a motor axis and positioned in the cleaner body housing;

(d) a cyclone unit positioned in the air flow passage, the cyclone unit comprising the dirty air inlet, an air outlet, a cyclone chamber, a dirt collection chamber, and a longitudinal axis extending between a front of the cyclone unit and a rear end of the cyclone unit, wherein a wall of the cyclone unit that is intersected by the longitudinal axis is moveable to an open position in which the dirt collection chamber is opened, wherein the cyclone unit is separable from the cleaner body housing as a closed unit and wherein the cyclone unit is removably securable to the front end of the cleaner body housing at the rear end of the cyclone unit and the cyclone unit is maintained in position by engagement with the front end of the cleaner body housing; and,

(e) a pre-motor filter positioned in the air flow passage upstream from the suction motor and having an upstream side and a downstream side wherein, when the cyclone unit and the cleaner body housing are separated, access to the pre-motor filter is provided;

wherein the cleaner body housing comprises a portion housing the pre-motor filter and the pre-motor filter remains in position when the cyclone unit is removed, and

wherein, when installed in the hand vacuum cleaner, the pre-motor filter has a diameter larger than a diameter of the cyclone chamber, and

wherein the longitudinal axis of the cyclone unit intersects an upstream face of the pre-motor filter.

2. The hand vacuum cleaner of claim 1 wherein the longitudinal axis of the cyclone unit and the motor axis are generally parallel.

3. The hand vacuum cleaner of claim 1 wherein the upstream side of the pre-motor filter faces the cyclone unit air outlet.

4. The hand vacuum cleaner of claim 1 wherein the downstream side of the pre-motor filter faces the suction motor.

5. The hand vacuum cleaner of claim 4 wherein the motor axis extends through the pre-motor filter.

6. The hand vacuum cleaner of claim 1 wherein the motor axis extends through the pre-motor filter.

7. The hand vacuum cleaner of claim 1 wherein the motor axis is perpendicular to the downstream side of the pre-motor filter.

8. The hand vacuum cleaner of claim 1 wherein the cleaner body housing is provided with a handle and one end of the handle is positioned adjacent the clean air outlet and a second end of the handle is positioned adjacent the cyclone unit.

9. The hand vacuum cleaner of claim 1 wherein the cleaner body housing is provided with a handle and the handle extends generally in the same direction as the motor axis.

10. The hand vacuum cleaner of claim 1 wherein the pre-motor filter is symmetrical about the longitudinal axis of the cyclone unit.

11. The hand vacuum cleaner of claim 10 wherein the pre-motor filter is symmetrical about the motor axis.

12. The hand vacuum cleaner of claim 1 wherein the pre-motor filter is symmetrical about the motor axis.

13. The hand vacuum cleaner of claim 1 wherein the wall is pivotally mounted to the cyclone unit.

14. The hand vacuum cleaner of claim 1 wherein the dirt collection chamber is positioned exterior to the cyclone chamber, the dirt collection chamber comprises a portion that is located laterally from the longitudinal axis of the cyclone unit and a portion of the pre-motor filter faces the dirt collection chamber and a portion of the pre-motor filter faces the cyclone chamber.

15. A hand vacuum cleaner comprising:

(a) an air flow passage extending from a dirty air inlet to a clean air outlet;

(b) a cleaner body housing having a rear end and a front end;

(c) a suction motor positioned in the air flow passage, the suction motor having a motor axis and positioned in the cleaner body housing;

(d) a cyclone unit positioned in the air flow passage and removably mounted to the cleaner body housing, the cyclone unit comprising the dirty air inlet, a cyclone unit air outlet, a cyclone chamber, a dirt collection chamber, a longitudinally extending axis and front and rear longitudinally spaced apart ends; and,

(e) a pre-motor filter positioned in the air flow passage upstream from the suction motor and having an upstream side and a downstream side wherein, when the cyclone unit and the cleaner body housing are separated, access to the pre-motor filter is provided,

wherein the cyclone unit is separable from the cleaner body housing with the front longitudinally spaced apart end of the cyclone unit remaining in a same position as when the cyclone unit is mounted to the cleaner body housing, and

wherein, when the cyclone unit is mounted to the cleaner body housing, the rear longitudinally spaced apart end of the cyclone unit is removably secured to and maintained in position by engagement with the front end of the cleaner body housing, and

wherein, when installed in the hand vacuum cleaner, the pre-motor filter has a diameter larger than a diameter of the cyclone chamber, and

wherein the dirt collection chamber is positioned exterior to the cyclone chamber, the dirt collection chamber comprises a portion that is located laterally from the longitudinal axis of the cyclone unit and a portion of the pre-motor filter faces the dirt collection chamber and a portion of the pre-motor filter faces the cyclone chamber.

16. The hand vacuum cleaner of claim 15 wherein a wall of the cyclone unit that is intersected by the longitudinally extending axis is moveable to an open position in which the dirt collection chamber is opened.