Surface cleaning apparatus

1. An surface cleaning apparatus having comprising:

(a) a surface cleaning head having a dirty air inlet;

(b) an upper portion moveably mounted to the surface cleaning head between an upright storage position and an inclined floor cleaning position;

(c) a portable surface cleaning unit comprising a suction motor and an air treatment member removably mounted to the upper portion;

(d) an air flow path extending from the dirty air inlet and including a flexible air flow conduit forming at least part of an air flow path from the dirty air inlet to the surface cleaning unit;

(e) a portable surface cleaning unit lock having a locked position in which the portable surface cleaning unit is secured to the upper portion and an unlocked position in which the portable surface cleaning unit is removable from the upper portion; and,

(f) a retaining member removably supporting the portable surface cleaning unit on the upper portion when the portable surface cleaning unit lock is in the unlocked position

wherein the portable surface cleaning unit lock is automatically moved to the unlocked position when the upper portion is moved to the floor cleaning position.

2. The surface cleaning apparatus of claim 1 wherein the retaining member comprises a magnet.

3. The surface cleaning apparatus of claim 1 wherein the retaining member comprises a member configured to retain the portable surface cleaning unit on the upper portion under the influence of gravity.

4. The surface cleaning apparatus of claim 1 wherein the portable surface cleaning unit lock is electrically operated.

5. The surface cleaning apparatus of claim 4 wherein the portable surface cleaning unit lock comprises a solenoid drivingly connected to a pin provided on one of the and the portable surface cleaning unit and the upper portion and a member engageable by the pin provided on the other of the portable surface cleaning unit and the upper portion.

6. The surface cleaning apparatus of claim 5 further comprising a sensor operatively connected to the solenoid wherein the solenoid is actuated when the sensor detects motion of the upper portion between the storage and floor cleaning positions.

7. The surface cleaning apparatus of claim 1 wherein the upper portion further comprises first and second portions that are part of the air flow path, and the second portion is rotatable relative to the first portion about an axis that intersects a longitudinal axis of at least one of the first and second portions.

8. The surface cleaning apparatus of claim 7 wherein the upper portion comprises a wand that is upstream of the flexible air flow conduit and the wand is removable for use in an above floor cleaning mode.