Composed element, multi-layered board and panel-shaped element for forming this composed element

A composed element, comprising at least two panel-shaped elements-formed of a board material and which, in a coupled condition, are connected together at an angle such that the at least two panel-shaped elements in the coupled condition form a corner connection, wherein the panel-shaped elements are connected by coupling parts, which comprise a protrusion on one of the panel-shaped elements and a slot in the other panel-shaped element;

• wherein the protrusion comprises a first hump and a second hump;
• wherein the first hump and the second hump are provided at opposite sides of the protrusion when observed in the cross section perpendicular to the two panel-shaped elements when coupled together to form the corner connection;
• wherein the slot comprises a first undercut and a second undercut;
• wherein the first undercut and the second undercut are provided at opposite sides of the slot when observed in the cross section perpendicular to the two panel-shaped elements when coupled together to form the corner connection, the first undercut located at a first depth of the slot, and the second undercut located at a second depth of the slot, the first depth located deeper in the slot than the second depth;
• wherein in the corner connection, the first hump in combination with the first undercut;
• and the second hump in combination with the second undercut provide a locking preventing the drifting apart of the protrusion and the slot;
• wherein, in a coupled condition, contact in the corner connection between the protrusion and the slot is only provided on exterior surfaces of the protrusion;
• wherein the protrusion is configured to be positioned proximate to a rear wall of the slot corresponding to a center portion of the protrusion when in a coupled condition, wherein the first and second humps engage the first and second undercuts, respectively, without tension incurred by the rear wall;
• wherein the slot is provided as a profiled part in the respective panel-shaped element;
• wherein the protrusion is provided as an insertion piece;
• wherein the protrusion is situated at an end face of the respective panel-shaped element;
• wherein the slot is situated at a lateral surface of the respective panel-shaped element;
• wherein the coupling parts and locking elements allow coupling by a displacement of the panel-shaped element comprising the protrusion perpendicular to the panel-shaped element comprising the slot.