Patent ID: 6844050

Claim:
Sheet, which has been previously cut-out to define an assembly of sheet parts, said sheet ( 1 ) being capable of assuming at least two first and second configurations, the first configuration called flat, in which said sheet in its assembly is substantially in one plane, and the second configuration called folded, obtained after folding, around hinge means ( 30 ), sheet parts ( 2 , 3 , 4 ) relative to one another to define a hollow volume, wherein said sheet is a stack at least three layers ( 21 , 22 , 23 ) on top of one another, respectively first, second and third layers, the second layer ( 22 ), situated between the first layer ( 21 ) and the third layer ( 23 ), being a layer of flexible material, and the first layer being a relatively rigid layer, the first relatively rigid layer ( 21 ) being one of the following materials: plywood board, wood fibre board, wood sheet, reconstituted wood board, laminated board of wood particles agglomerated with or without a bonding agent, the hinge means ( 30 ) comprising a groove ( 33 ) provided along a fold line ( 34 ) in only the first ( 21 ) layer.