Surface cleaning apparatus

1. An upright surface cleaning apparatus having a front, a rear and opposed lateral sides and comprising:

a) a surface cleaning head having a dirt inlet;

b) an upper section moveably mounted to the surface cleaning head between a floor cleaning position, in which the upright surface cleaning apparatus is useable for cleaning a floor, and a storage position in which the upper section is maintained in an upright position relative to the floor, the upper section having a longitudinal axis extending between an upper end and a lower end of the upper section, the upper section also being rotatably coupled to the surface cleaning head whereby rotation of the upper section relative to the surface cleaning head is enabled;

c) a cleaning unit removably mounted to the upper section, the cleaning unit comprising an air treatment member, a suction motor and a clean air outlet and wherein the cleaning unit is usable in both a mounted and an unmounted configuration;

d) an air flow path extending from the dirt inlet to the clean air outlet and comprising the air treatment member and the suction motor;

e) an anti-rotation locking mechanism inhibiting rotation of the upper section when the upper section is in the storage position;

wherein the cleaning unit is removable while the upper section is in the storage position, and wherein the upper section is rotatable relative to the surface cleaning head about the longitudinal axis when the cleaning unit is mounted to the upper section and the upper section is in the floor cleaning position.

2. The upright surface cleaning apparatus of claim 1 , wherein the surface cleaning apparatus has at least two operating modes comprising: a first operating mode in which the cleaning unit is mounted to the upper section and is in airflow communication with the dirt inlet and a flexible hose comprises a portion of the airflow path between the cleaning unit and the dirt inlet; and a second operating mode in which the cleaning unit is removed from the upper section and is in airflow communication with the dirt inlet and the flexible hose comprises a portion of the airflow path between the cleaning unit and the dirt inlet.

3. The upright surface cleaning apparatus of claim 2 , wherein when the surface cleaning apparatus is in the first operating mode the cleaning unit is supported by the upper section.

4. The upright surface cleaning apparatus of claim 2 , wherein the upper section is movable between the storage position and the floor cleaning position when the surface cleaning apparatus is in the first operating mode and when the surface cleaning apparatus is in the second operating mode.

5. The upright surface cleaning apparatus of claim 2 , wherein the surface cleaning apparatus is changeable between the first operating mode and the second operating mode without interrupting the airflow communication between the dirt inlet and the cleaning unit.

6. The upright surface cleaning apparatus of claim 2 , wherein the surface cleaning apparatus is operable in a third operating mode in which the cleaning unit is detached from the upper section and is not in air flow communication with the surface cleaning head and is operable as a hand vacuum cleaner.

7. The upright surface cleaning apparatus of claim 1 , wherein the upper section comprises a rigid airflow conduit, and wherein the cleaning unit is supported on the rigid airflow conduit when mounted to the upper section.

8. The upright surface cleaning apparatus of claim 1 , wherein the cleaning unit is vertically removable from the upper section when the upper section is in the storage position.

9. The upright surface cleaning apparatus of claim 1 , wherein the cleaning unit is removable in the absence of adjusting a configuration of the upper section.

10. The upright surface cleaning apparatus of claim 1 , wherein the anti-rotation locking mechanism comprises a first abutment member and a second abutment member spaced apart from the first abutment member provided on a portion of the upper section that is rotatable about the longitudinal axis, the first and second abutment members each extending laterally outward from one of the surface cleaning head and the upper section, the other of the surface cleaning head and the upper section comprising a stop member having a first stop face and a second stop face spaced apart from the first stop face, when the upper section is in the storage position the first abutment member abuts the first stop face and the second abutment member abuts the second stop face whereby rotation of the upper section about the longitudinal axis is inhibited, and when the upper section is in the floor cleaning position the first abutment member is spaced apart from the first stop face and the second abutment member is spaced apart from the second stop face.

11. The upright surface cleaning apparatus of claim 10 , wherein the first and second abutment members and the stop member comprise an alignment mechanism whereby contact between at least one of the abutment members and the stop member guides the upper section to a storage rotational orientation when the upper section is moved from the floor cleaning position into the storage position.

12. The upright surface cleaning apparatus of claim 1 , wherein the upper section is rotatably coupled to the surface cleaning head by a rotational coupling member and the rotational coupling member comprises a portion of the air flow path.

13. The upright surface cleaning apparatus of claim 10 , wherein the first and second abutment members are provided on opposed sides of the upper section and the stop member is provided on the surface cleaning head.

14. The upright surface cleaning apparatus of claim 1 , wherein the upper section comprises a rotational coupling member having a longitudinally extending member that comprises a portion of the airflow path and extends along a longitudinal axis, whereby the longitudinal axis extends through a portion of the airflow path.

15. The upright surface cleaning apparatus of claim 1 , wherein the air flow path comprising a flexible hose having a downstream end coupled to the cleaning unit.

16. The upright surface cleaning apparatus of claim 2 , wherein the anti-rotation locking mechanism is operable in both the first and second operating modes.

17. The upright surface cleaning apparatus of claim 1 , wherein the air treatment member comprises at least a first cyclone chamber having an air inlet, an air outlet and a dirt outlet, and at least a first dirt collection chamber in communication with the dirt outlet.

18. The upright surface cleaning apparatus of claim 17 , wherein the first dirt collection chamber is external the first cyclone chamber.

19. The upright surface cleaning apparatus of claim 17 , wherein the first cyclone chamber comprises a cyclone axis about which air within the first cyclone circulates and the first dirt collection chamber is disposed at least partially axially between the first cyclone chamber and the suction motor.