Construction technique for a domestic appliance such as a surface cleaning apparatus

1. A surface cleaning apparatus comprising:

(a) a fluid flow path including a dirt inlet and a clean air outlet with a suction motor and a treatment member provided in the fluid flow path;

(b) a first part of the surface cleaning apparatus having an opening and a second part of the surface cleaning apparatus having a key receiving portion, the second part comprises an air flow conduit and forms a portion of the fluid flow path, the second part has an outer surface and an inner surface, the inner surface defining the portion of the fluid flow path, the key receiving portion having a depth and terminating prior to the inner surface; and,

(c) a key insertable into the opening and the key receiving portion;

(d) an anti-rotation member provided on an outer surface of the second part, and the first part having a mating anti-rotation member,

wherein the opening is provided through the mating anti-rotation member, and the key receiving portion is defined by a discontinuity in the anti-rotation member

whereby the first part and the second part are secured together when the key is inserted.

2. The surface cleaning apparatus of claim 1 wherein the anti-rotation member comprises a longitudinally extending spline provided on the outer surface.

3. The surface cleaning apparatus of claim 2 wherein the mating anti-rotation member comprises a mating recess defined in an inner surface of the first part.

4. The surface cleaning apparatus of claim 1 wherein the key receiving portion comprises a recess provided in or adjacent the outer surface.

5. The surface cleaning apparatus of claim 4 wherein the anti-rotation member comprises a longitudinally extending spline provided on the outer surface.

6. The surface cleaning apparatus of claim 5 wherein the mating anti-rotation member comprises a mating recess defined in an inner surface of the first part.

7. The surface cleaning apparatus of claim 5 wherein the recess comprises a discontinuity in the anti-rotation member.

8. The surface cleaning apparatus of claim 1 wherein the first part is positioned over the second part.

9. The surface cleaning apparatus of claim 1 wherein the first and second parts are adapted to be secured together by the key and an additional key.

10. The surface cleaning apparatus of claim 9 wherein the first part is positioned over the second part and the key and the additional key are spaced apart around a perimeter of the first part.

11. The surface cleaning apparatus of claim 9 wherein the first part is positioned over the second part and the key and the additional key are positioned on opposite sides of the first part.

12. An appliance or domestic apparatus comprising:

(a) a first part positioned over a second part;

(b) the first part having an opening and the second part having a key receiving portion; and,

(c) a key having an outer surface and being insertable into the opening and the key receiving portion such that the outer surface of the key terminates flush or inwards of an outer surface of the first part;

(d) an anti-rotation member provided on an outer surface of the second part, and the first part having a mating anti-rotation member;

wherein the opening is provided through the mating anti-rotation member, and the key receiving portion is defined by a discontinuity in the anti-rotation member

whereby the parts are secured together when the key is inserted.

13. The appliance or domestic apparatus of claim 12 wherein the first and second parts are adapted to be secured together by the key and an additional key.

14. The appliance or domestic apparatus of claim 13 wherein the key and the additional key are spaced apart around a perimeter of the first part.

15. The appliance or domestic apparatus of claim 12 wherein the second part comprises an air flow conduit.

16. The appliance or domestic apparatus of claim 12 wherein the anti-rotation member comprises a longitudinally extending spline provided on the outer surface.

17. The appliance or domestic apparatus of claim 16 wherein the mating anti-rotation member comprises a mating recess defined in an inner surface of the first part.

18. The appliance or domestic apparatus of claim 12 wherein the second part comprises a wall defining the outer surface and the key receiving portion comprises a recess provided in or adjacent the outer surface.

19. The appliance or domestic apparatus of claim 18 wherein the recess does not penetrate through the wall.

20. The appliance or domestic apparatus of claim 18 wherein the anti-rotation member comprises a longitudinally extending spline provided on the outer surface.

21. The appliance or domestic apparatus of claim 20 wherein the mating anti-rotation member comprises a mating recess provided on an inner surface of the first part.