Device for at least partially closing off a cavity that is open at the top

A closure device to at least partially close a cavity that is open at a top thereof, said closure device comprising:

• a plurality of panels configured to form a closure cover to at least partially close off said cavity and a cover support device configured to support said panels when said panels are deployed to form said closure, each panel of said plurality of panels having a link system linking to neighboring panels to enable said plurality of panels to go from a stacked configuration, in which the plurality of panels are superposed on one another in order to at least partially open up said opening in said cavity to a deployed configuration, in which at least one panel of the plurality of panels extends in alignment with other panels of the plurality of panels while bearing against said cover support device to form said closure cover, and vice versa;
• and
• an elastically deformable device configured to be compressed by said panels when said plurality of panels are in the stacked configuration, a resistance to deformation of said elastically deformable device being a function of a thickness and a weight of the panels such that a top of the plurality of panels in the stacked configuration, or a top of each panel of the plurality of panels, that exerts a bearing force on the elastically deformable device is situated at a substantially constant height both when said panels are in the stacked configuration and when at least some of the panels are in the deployed configuration when the weight of said at least some of the panels is supported by said cover support device.