Structural elements

Claim 1

A STRUCTURAL ELEMENT COMPRISING, AN ELONGATED MEMBER OF RIGHT ANGLE CROSS-SECTION HAVING A WIDE FLANGE AND A NARROW FLANGE, LONGITUDINALLY SPACED RECTANGULAR GROUPS OF OPENINGS IN THE WIDE FLANGE, EACH GROUP INCLUDING A PLURALITY OF SLOTS WHICH ARE INCLINED AT A 45* ANGLE TO THE LONGITUDINAL AXIS OF THE WIDE FLANGE AND A PLURALITY OF HOLES, THE MINOR DIMENSION OF THE SLOTS CORRESPONDING TO THE DIAMETER OF THE HOLES, AND TO THE CROSS-SECTIONAL DIAMETER OF FASTENERS TO BE RECEIVED THERETHROUGH, THE SLOTS OF A GROUP BEING POSITIONED AT THE CORNERS OF AT LEAST ONE TRIANGULAR ARRANGEMENT AND THE HOLES OF A GROUP BEING POSITIONED AT THE CORNERS OF AT LEAST ONE TRIANGULAR ARRANGEMENT OVERLYING AND INVERTED WITH RESPECT TO THE TRIANGULAR ARRANGEMENT OF THE SLOTS, THE OPENING AT THE APEX OF EACH TRIANGULAR ARRANGEMENT OF OPENINGS LYING IN LONGITUDINAL ALIGNMENT WITH THE OPENINGS AT THE BASE CORNERS OF THE OVERLYING TRIANGULAR ARRANGEMENT OF OPENINGS, AND THE SLOT AT THE APEX OF THE TRIANGULAR ARRANGEMENT OF SLOTS POSITIONED SO THAT ITS MAJOR AXIS PROJECTED BISECTS THE MAJOR AXIS OF THE SLOT AT ONE BASE CORNER AND THE MAJOR AXIS PROJECTED OF THE SLOT AT THE OTHER BASE CORNER OF THE TRIANGULAR ARRANGEMENT OF SLOTS BISECTS THE MAJOR AXIS OF THE SLOT AT HE APEX, WHEREBY THE SLOTS OF SAID WIDE FLANGE AND THE HOLES OF THE WIDE FLANGE OF A LIKE COMPANION STRUCTURAL ELEMENT INTERSECT TO PROVIDE FASTNER RECEIVING OPENINGS COEXTENSIVE WITH SAID HOLES AT A PLURALITY OF DIFFERENT RELATIVE LONGITUDINAL OVERLAPPED CONDITIONS OF SAID WIDE FLANGES WHEN THE FIRST MENTIONED AND COMPANION STRUCTURAL ELEMENTS ARE IN SIMILARLY ORIENTED, LONGITUDINALLY ALIGNED, LAPPED RELATION AND WHEREBY THE SLOTS OF THE WIDE FLANGES OF SAID FIRST MENTIONED STRUCTURAL ELEMENT AND A LIKE COMPANION STRUCTURAL ELEMENT INTERSECT TO PROVIDE FASENER RECEIVING OPENINGS OVER A SERIES OF INTERRUPED RANGES OF RELATIVE LONGITUDINAL ADJUSTMENT OF SAID STRUCTURAL ELEMENTS WHEN THE STRUCTURAL ELEMENTS ARE ARRANGED WITH THEIR WIDE FLANGES IN ALIGNED ABUTMENT AND THEIR NARROW FLANGES EXTEND OPPOSITELY IN COPLANAR RELATION.