Extensible table with central leaf

A table with central extension, comprising a frame, two movable trays bearing on said frame and adapted to be brought close to one another so as to constitute a continuous surface on their own, or to be symmetrically brought away from each other, or independently of each other so as to enable the set-up of one or several central extension(s) between said movable trays, wherein edges of the movable trays and of said extension(s) include at least one tab located on a first half of said edge and a groove located on a second half of said edge, said tab including a first tab portion extending from a distal edge of the tab and having a length comprised between 30% and 50% of the total length of the tab and a second tab portion extending up to a proximal edge of the tab and having a length comprised between 30% and 50% of the total length of the tab, the first tab portion having a height increasing from the distal edge of the tab up to a central portion of the tab and the second tab portion having a height decreasing from the central portion of the tab up to the proximal edge of the tab, said tab having a length comprised between 30% and 50% of the length of the respective edge, and the depth of the groove being larger than the height of the tab, enabling an assembly by mortise-and-tenon joint even when the trays and/or the extension are deformed.