Grid type structures

Claim 1

AN OPEN GRID STRUCTURE OF THE CLASS DESCRIBED COMPRISING A PLURALITY OF PARALLEL SPACED PAIMARY ELEMENTS OF GENERALLY UNIFORM RECTANGULAR TRANSVERSE CROSS-SECTION, PARALLEL SPACED SECONDARY TRANSVERSE CROSS-LACING ELEMENTS ADAPTED TO UNITARILY CONNECT AID PRIMARY ELEMENTS IN RIGID STRUCTURAL ASSEMBLY, SAID CROSS-LACING ELEMENTS BEING INITIALLY DEFINED IN TRANSVERSE CROSS-SECTION BY A WEB AND AT LEAST ONE ANGULARLY EXTENDING FLANGE PORTION INTEGRAL AND AXIALLY COEXTENSIVE WITH SAID WEB, AXIALLY SPACED AND REGISTERED APERTURES TRANSVERSELY THROUGH THE TRANSVERSE THICKNESS DIMENSION OF THE PRIMARY ELEMENTS CONFINED WITHIN THE DEPTH OF THE SAME, SAID APERTURES EACH BEING SUBSTANTIALLY COMPLEMENTARY IN OUTLINE AND AREA TO THE TRANSVERSE CROSS-SECTION OF EACH OF THE CROSS-LACING ELEMENTS AND RECEIVING THE CROSS-LACING ELEMENTS EXTENDING THERETHROUGH WITH THE FLANGE OF EACH THEREOF SUBSTANTIALLY PARALLEL TO ONE MARGINAL EDGE SURFACE OF EACH OF THE PARALLEL SPACED PRIMARY ELEMENTS, THE FLANGE OF EACH CROSS-LACING ELEMENT BEING PROVIDED WITH AXIALLY SPACED MARGINAL OPEN ENTRANCE SLOTS INTERRUPTING THE CONTIGUOUS AXIAL LENGTH THEREOF, THE SLOTS EACH HAVING A DEPTH LESS THAN THE UNIFORM WIDTH OF THE FLANGE OF EACH CROSS-LACING ELEMENT AND PROVIDING AN IMPERFORATE FLANGE AREA ADJACENT THE ROOT OF EACH SLOT WITHIN THE PROJECTED LATERAL BOUNDARIES THEREOF, SAID FLANGE OF EACH CROSS-LACING ELEMENT BETWEEN THE SLOTS THEREIN BEING ANGULARLY DEFLECTED OUT OF REGISTRY WITH THOSE PORTIONS OF THE APERTURES IN THE PRIMARY ELEMENTS RECEIVING THE SAME TO THEREBY PROVIDE INTERFERENCE DISPLACEMENT OF THE IMPERFORATE AREAS ADJACENT THE ROOT OF EACH SLOT IN THE FLANGE OF A CROSS-LACING ELEMENT, SAID DISPLACED MATERIAL OF THE FLANGE CONSTITUTING AN OUTWARDLY STRUCK CONTIGUOUS SADDLE FORMATION EMBRACING EACH PRIMARY ELEMENT LATERALLY OF AND OUTWARDLY BEYOND EACH APERTURE THERETHROUGH, AS WELL AS EMBRACING THE WALL OF THE APERTURE CONTIGUOUSLY THEREWITH, AND SAID SADDLE FORMATION IN EACH INSTANCE CONTACTINLY WEDGING THE CROSS-LACING ELEMENTS WITHIN THE APERTURES IN THE SPACED PARALLEL PRIMARY ELEMENTS RECEIVING THE SAME AGAINST OPPOSITE WALLS THEREOF ADJACENT OPPOSITE MARGINAL EDGES OF EACH PRIMARY ELEMENT.