Foldable building

1. An expandable building assembly, the building assembly having a retracted condition, in which the roof of the building has a first area, and an extended condition, in which the roof of the building has a second area, the second area being greater than the first, the assembly comprising:

a roof portion having a distal edge; and

means for displacing and rotating the roof portion between the retracted condition and the expanded condition;

whereby in the retracted condition, the roof portion is in a first position and at a first orientation, and in the extended condition, the roof portion is in a second position and at a second orientation, wherein the second position is displaced from the first position and the second orientation is rotated with respect to the first orientation:

wherein the roof portion is substantially vertical in the first position; and

wherein the distal edge of the roof portion in moving from the retracted condition to the extended condition moves in a first linear path and thereafter in a second arcuate path.

2. The assembly according to claim 1 , wherein the assembly has a footprint and, in the first position, the roof portion lies within the footprint of the assembly.

3. The assembly according to claim 2 , wherein the roof portion forms a portion of a wall of the assembly when in the first position.

4. The assembly according to claim 1 , wherein the assembly has a footprint and in the second position the roof portion lies at least partially outside the footprint of the assembly.

5. The assembly according to claim 1 , wherein in the extended condition, an intermediate portion extends between the roof portion and other components of the assembly.

6. The assembly according to claim 5 , wherein the intermediate portion forms at least a portion of an outer wall of the assembly when in the retracted condition.

7. The assembly according to claim 5 , wherein the extended condition, the roof portion and the intermediate portion interlock.

8. The assembly according to claim 1 , further comprising one or more wall portions, the or each wall portion moveable between the retracted and extended conditions.

9. The assembly according to claim 8 , wherein the one or more wall portions unfold when moving from the retracted condition to the extended condition.

10. The assembly according to claim 8 , wherein the assembly has a footprint and the wall portions lie within the footprint of the assembly when in the retracted condition.

11. The assembly according to claim 1 , further comprising a floor assembly, the floor assembly moveable between the extended condition and the retracted condition.

12. The assembly according to claim 11 , wherein the floor assembly forms a floor beneath the entire roof portion, when the roof portion is in the extended condition.

13. The assembly according to claim 11 , wherein the floor assembly unfolds in moving from the retracted condition to the extended condition.

14. The assembly according to claim 11 , wherein the floor assembly comprises one or more floor portions, the or each floor portion being substantially vertical when in the retracted condition.

15. The assembly according to claim 1 , wherein two or more components of the assembly are interconnected by a lever assembly, the lever assembly comprising:

a first arm rotatable at a first position thereon about a first fixed pivot;

a second arm rotatable at a first position thereon about a second fixed pivot, the second fixed pivot spaced apart from the first fixed pivot;

a third arm pivotably connected at a first position thereon to the second arm at a second position on the second arm, the second position spaced apart from the first position on the second arm;

a first connecting arm extending between the first arm and the third arm, the first connecting arm pivotably connected to a second position on the first arm spaced apart from the first position and pivotably connected to the third arm at a second position thereon spaced apart from the first position thereon; and

a second connecting arm extending between the first arm and the second arm, the second connecting arm pivotably connected to a third position on the first arm disposed between the first and second positions thereon and pivotably connected to a third position on the second arm at a third position thereon.

16. The assembly according to claim 1 , wherein two or more components are interconnected by a lever assembly, the lever assembly comprising:

a first arm rotatable at a first position thereon about a first fixed pivot;

a second arm rotatable at a first position thereon about a second fixed pivot, the second fixed pivot spaced apart from the first fixed pivot;

a third arm pivotably connected at a first position thereon to the second arm at a second position on the second arm, the second position spaced apart from the first position on the second arm;

a fourth arm pivotably connected at a first position thereon to the second arm at a third position on the second arm;

a first connecting arm extending between the first arm and the third arm, the first connecting arm pivotably connected to a second position on the first arm spaced apart from the first position and pivotably connected to the third arm at a second position thereon spaced apart from the first position thereon;

a second connecting arm extending between the first arm and the second arm, the second connecting arm pivotably connected to a third position on the first arm disposed between the first and second positions thereon and pivotably connected to a fourth position on the second arm at a third position thereon; and

a third connecting arm extending between the first arm and the fourth arm, the third connecting arm pivotably connected to a fourth position on the first arm and pivotably connected to a second position on the fourth arm.

17. The assembly according to claim 1 , wherein movement of a first component of the assembly is at least partially counterbalanced by movement of a second component of the assembly.

18. The assembly according to claim 17 , wherein the first component is the roof portion.

19. The assembly according to claim 17 , wherein the second component is one or more floor portions.

20. A method of changing the roof of a building between a retracted condition, in which the roof has a first area, and an expanded condition, in which the roof has a second area, the second area greater than the first area, the method comprising:

providing a roof portion of the building, the roof portion comprising a distal edge and having a first position and a first orientation in the retracted condition and a second position and a second orientation in the expanded condition;

wherein the roof portion is substantially vertical in the first position;

wherein when in the second position the roof portion is displaced from its first position and when in the second orientation the roof portion is rotated relative to its first orientation;

the method comprising displacing the roof portion between the first position and the second position and rotating the roof portion between the first orientation and the second orientation; wherein the distal edge of the roof portion in moving from the retracted condition to the extended condition moves in a first linear path and thereafter in a second arcuate path.