<p>The device has a plate movable in translation and rotation in a manner to be inclinable with respect to rest position under pressure of a user. Flexible guiding tabs (301) are connected to a side of the plate arranged toward deformable partition (11), where the partition is supported against a deformable partition or against a wall of a storage space (30) of the partition. The partition (11) has an inner wall forming a part of a chamber (1), where the partition is curved toward the exterior of the chamber in a non-compressed position.</p>
