Floor protection device for vehicle cab

1. A protection device fixed to a vehicle cab, the vehicle cab comprising:

a substantially planar floor extending throughout the entire width of the cab,

and two substantially vertical lateral walls one on each side of the cab,

wherein the protection device fixed to the cab, comprises:

at least one substantially planar armor plate extending throughout the entire width of the cab, arranged at a distance below the cab and substantially parallel to the floor of the cab, and

first and second groups of at least one deformable compartmented caissons connected between the floor of the cab and the armor plate,

wherein each compartmented caisson comprises at least two buckleable walls substantially perpendicular to the armor plate and dimensioned to buckle upon shock impact,

and the caissons in each of said first and second groups each comprises at least one lower wall and one upper wall both integral with said buckleable walls,

and said lower walls are fastened to the armor plate, and the upper walls are fastened to the floor of the cab,

and said first and second groups are located with one of said groups below each side of the floor of the cab under said lateral walls of the cab,

and a free space is defined between the floor and the armor plate and between said first and second groups.

2. A protection device according to claim 1 , wherein said buckleable walls are substantially perpendicular to the lateral walls of the cab.

3. A protection device according to claim 1 , wherein said first and second groups each comprises a plurality of compartmented caissons, wherein the compartmented caissons on each side of the cab are integral with the same lower wall of one group, wherein the compartmented caissons are positioned at a distance from one another so that the compartmented caissons are separated by at least one lateral space.

4. A protection device according to claim 3 , wherein said first and second groups each comprises a lateral plate fastened to said compartmented caissons on each side of the cab.

5. A protection device according to claim 4 , wherein said lateral plate has at least one opening thereby permitting access to said lateral space from the exterior of the vehicle.

6. A protection device according to claim 5 , wherein said opening is closed by a hatch or a cover, said lateral space defining a storage case.

7. A protection device according to claim 5 , wherein at least three of said compartmented caissons on each side of the cab define at least two of said lateral spaces.

8. A protection device according to claim 4 , wherein said lateral plate forms an angle with respect to the armor plate such that the compartmented caissons on each side of the cab form a deflector.

9. A protection device according to claim 1 , wherein at least one of said first and second groups on at least one side of the cab comprises a plane upper rim which extends outwardly from the vehicle beyond the lateral wall of the cab, said upper rim being parallel to said upper wall of said first or second group.

10. A protection device according to claim 1 , wherein at least one of said compartment caissons is filled with an energy absorbing material.

11. A protection device according to claim 1 , wherein at least one of said first and second groups comprises a plane upper rim which extends outwardly from the vehicle beyond the lateral wall of the cab, said upper rim corresponding to said upper wall of said first or second group.

12. A protection device according to claim 1 , wherein each of said first and second groups comprises a plurality of upper walls and a plurality of lower walls, wherein each of said first and second groups comprises a plurality of compartmented caissons each comprising one of the upper walls and one of the lower walls independently from the other compartment caissons, wherein each of the lower walls is fastened to the armor plate, and each of the upper walls is fastened to the floor of the cab.

13. A protection device according to claim 1 , wherein each of said first and second groups comprises a plurality of compartmented caissons.

14. A protection device according to claim 1 , wherein each caisson of at least one of the first and second groups extends along the full length of the cab, on each side of the cab, each caisson further comprising partitions linked to said upper and lower walls of the first or second group.

15. A protection device according to claim 14 , wherein in each caisson, said partitions are parallel to the buckleable walls.

16. A protection device according to claim 1 , wherein said upper wall of said first group and said upper wall of said second group extend outwardly from the vehicle beyond the lateral wall of the cab to form a plane rim.

17. A protection device according to claim 16 , wherein said first and second groups each comprises a lateral plate fastened to said compartmented caissons on each side of the cab, said lateral plate forming an angle with respect to the armor plate such that the compartmented caissons on each side of the cab form a deflector.

18. A protection device according to claim 17 , wherein the armor plate is fastened to the cab by said deformable compartmented caissons.

19. A protection device according to claim 1 , wherein the armor plate is fastened to the cab by said deformable compartmented caissons.