Patent ID: 7931871

Claim:
An inner tray, to be placed in a chamber, the inner tray comprising: a plurality of parallel beams ( 1 ), located in a common horizontal plane and fixed via their ends to the chamber wall, and, between said beams and supported thereby, rows of adjacent rectangular plates ( 2 ), completely covering the space between the beams, wherein the supporting edges ( 3 ) of the plates ( 2 ) through which said plates rest on the beams ( 1 ), are folded downward by two substantially right-angle folds, and each of the edges ( 4 ) of the plates ( 2 ), perpendicular to the beams ( 1 ), is folded so as to form a female part ( 4 a ) or a male part ( 4 b ) capable of nesting respectively in a male part ( 4 b ) or a female part ( 4 a ) formed by the folded edge of the adjacent plate.