Interlocking metallic structural members

Claim 1

A SET COMPRISING AT LEAST TWO PANEL-LIKE EXTRUDED METAL SECTIONS ADAPTED TO BE ASSEMBLED INTO SNUG INTERLOCKING ENGAGEMENT ALONG THEIR SIDE EDGES TO FORM AT LEAST A PORTION OF A FLOOR, A WALL, OR THE LIKE, A FIRST OF SAID SECTIONS HAVING ALONG ONE SIDE EDGE AN INTEGRAL RIB PROJECTING FROM ONE FACE OF SAID SECTION, A LIP ALONG SAID EDGE OVERHANGING THE OUTER SIDE OF SAID RIB AND HAVING A CURVED INNER SURFACE, A FLANGE-LIKE EXTENSION ALONG THE FREE EDGE OF SAID RIB AT THE OUTER SIDE OF THE LATTER AND HAVING A CURVED INNER SURFACE OPPOSED TO SAID LIP INNER SURFACE, SAID INNER SURFACES HAVING A SUBSTANTIALLY COMMON CENTER OF CURVATURE, A SECOND OF SAID SECTIONS HAVING ALONG ONE SIDE EDGE AN INTEGRAL RIB PROVIDED WITH A PAIR OF CURVED SURFACES FACING OPPOSITELY AND OUTWARDLY OF THE TWO FACES OF SAID SECOND SECTION, ONE ADJACENT THE BASE OF SAID LAST-MENTIONED RIB, AND ONE ADJACENT ITS FREE EDGE, SAID PAIR OF CURVED SURFACES BEING COMPLEMENTARY AND CONFORMING RESPECTIVELY TO SAID CURVED INNER SURFACES ON SAID FIRST SECTION FOR SNUG INTERFITTING ENGAGEMENT THEREWITH WHEN SAID SECTIONS ARE INTERLOCKED, THE ARRANGEMENT BEING SUCH THAT ONE OF SAID OUTWARDLY-FACING CURVED SURFACES ON SAID SECOND SECTION CAN BE PARTIALLY ENGAGED WITH ITS COMPLEMENTARY INNER CURVED SURFACE ON SAID FIRST SECTION WITH SAID SECTIONS TILTED RELATIVE TO EACH OTHER, AND THEN SAID SECTIONS RELATIVELY ROTATED ABOUT THE ENGAGED SURFACES INTO THE SAME PLANAR DISPOSITION TO ASSEMBLE SAID SECTIONS INTO INTERLOCKING ENGAGEMENT WITH ALL OF SAID CONFORMING SURFACES IN SNUG ENGAGEMENT.