Double-lock rail

A rail for stretched fabric false wall provided with a hook-shaped harpoon comprising an inner arm by means of which said harpoon is connected to a periphery of said fabric and a curved outer arm, said rail comprising two peripheral vertical flanges and a central vertical flange, each of said peripheral vertical flanges and said central flange extending downward and defining two downwardly opening recesses, said peripheral vertical flanges comprising shoulders formed on inner surfaces of each of said peripheral vertical flanges, and said central vertical flange comprises a shoulder formed on each surface of said central flange, wherein each of the shoulders on the two peripheral vertical flanges and each of the shoulders on the central flange are configured to receive the bottom end of the outer arm when the fabric is stretched, and wherein the shoulders on each of said peripheral vertical flanges are placed at the same vertical height than the shoulders of said central flange, wherein said shoulders are placed above the bottom end of the central and vertical flanges and configured to maintain the fabric stretched;

• the peripheral vertical flanges and the central flange are equivalent lengths.