Ventilating cushion

Claim 1

A VENTILATING CUSHION COMPRISING A DIMENSIONALLY STABLE SHEET OF FLEXIBLE SLITTED AND EXPANDED PLASTIC MATERIAL HAVING ROWS OF PERFORATIONS, EACH PERFORATION TAPERING TO A POINT AT THE OPPOSITE ENDS THEREOF, THE PERFORATIONS BEING SEPARATED BY CONTINUOUS UNDULATING STRIPS OF RECTANGULAR CROSS SECTION HAVING UNIFORM WIDTH AND THICKNESS AND SHARP CORNER EDGES, THE CREAST OF EACH STRIP BEING INTEGRAL WITH THE RESPECTIVE ADJACENT TROUGHS OF AN ADJACENT STRIP TO FORM IMPERFORATE AREAS EACH OF TWICE THE WIDTH OF THE REMAINING PARTS OF THE STRIP, THE TOPS OF THE CRESTS AND THE BOTTOMS OF THE TROUGHS BEING ADAPTED DIRECTLY TO CONTACT THE LOAD ON THE CUSHION AND THE SUPPORTING SURFACE FOR THE CUSHION RESPECTIVELY AND TO MAINTAIN THE REMAINING PARTS OF THE STRIPS OUT OF CONTACT WITH SAID LOAD AND SAID SUPPORTING SURFACE WHEN THE CUSHION IS IN USE, AN EDGE FINISHING TAPE FOLDED IN HALF AROUND AND IN CONTACT WITH BOTH FACES OF THE SHEET AT THE MARGINAL PORTION OF THE SHEET, STITCHING PASSING THROUGH AND SECURING THE INNER EDGE PORTIONS OF THE TAPE TOGETHER AND TO THE SHEET, AND MARGIN-STIFFENING MEANS FOR THE SHEET CONSISTING OF A BORDER WIRE ARRANGED WITHIN THE TAPE OUTWARDLY OF THE STICHING AND HELD IN POSITION ON A FACE OF THE SHEET SOLELY BY SAID TPAE AND STITCHING.