Assembly of two interconnected similar plastic planks and a framework

An improved assembly of the type having two interconnected similar plastic planks, a framework, and a fastening means for attaching said planks to said framework, said planks including a first plank and a second plank, characterized in that each of said planks includes a first side including an L-shaped projecting plate thereon, a second side positioned opposite to said first side and including a U-shaped projecting plate, and means formed on said L-shaped projection plate and said U-shaped projection plate for holding said L-shaped projecting plate of said first plank on said U-shaped projecting plate of said second plank, each of said L-shaped projecting plates including a vertical plate extending longitudinally upwardly from the upper surface of said plank, and a horizontal plate extending horizontally outwardly from the end of said vertical plate, each of said U-shaped projecting plates including a long vertical plate extending longitudinally upwardly from the upper surface of said plank a distance slightly greater than that of said long vertical plate of said L-shaped projecting plate, a second horizontal plate extending horizontally outwardly from the end of said vertical plate of said U-shaped projecting plate and being of a width slightly greater than that of said horizontal plate of said L-shaped projecting plate, and a short vertical plate extending longitudinally downwardly from the end of said horizontal plate of said U-shaped projecting plate a distance less than said vertical plate of said U-shaped projecting plate;

• whereby, said L-shaped projecting plate of said first plank can be held within and on said U-shaped projecting plate of said second plank.