Abstract: A wall panel assembly and panel pieces therefore are disclosed. The panel pieces have edges with tongues having interengageable angularly oriented surfaces arranged toward the rear side of the panels. When the edges of adjacent panels are engaged to form a wall panel assembly, a tongue on one panel is captured in overlying relation with a tongue on the adjacent panel. Arrangement of the tongues toward the rear side of the panels permits vertical loads on the panels to be carried by shear forces in the fasteners attaching the panel pieces to a structure, increasing the dynamic load that the panel pieces can withstand without failure. The panel pieces are advantageous for use in moving structures such as elevator cabs.

Abstract: Panels which are joined at their opposing end faces are used to create a panel assembly. The opposing end faces may be a tongue and groove arrangement or they may consist of matching beveled recesses. In either case, the interrelationship between the opposing end faces is such that, upon assembly, an intervening space is created between adjoining panels. This intervening space eliminates the cantilever force effect associated with known panel assemblies and it results, instead, in a shear force which is evenly distributed over the full extent of the abutting panel faces.