Carpet or floor tiles

Claim 1

A FLOOR CARPET TILE COMPRISING A PLURALITY OF LAYERS OF GENERALLY QUADRILATERAL SHAPE, SAID LAYERS BEING JOINED TOGETHER TO FORM A UNIT INCLUDING A SQUARE UPPER LAYER COMPRISING A CARPET FABRIC PRESENTING A WALKING SURFACE AND A BASE LAYER UNDERLYING SAID UPPER LAYER, SAID UPPER LAYER HAVING STRAIGHT SIDE EDGES FOR ABUTTING OPPOSING SIDE EDGES OF ADJOINING TILES, SAID BASE LAYER HAVING UNDULATIONS EXTENDING ALONG EACH OF THE SIDE EDGES THEREOF FOR INTERLOCKING WITH CORRESPONDING UNDULATIONS ON AN ADJOINING TILE, SAID UNDULATIONS FORMING CURVED PROJECTIONS AND RECESSES OF COMPLEMENTARY SHAPE, RESPECTIVELY EXTENDING ALTERNATELY BEYOND AND BENEATH THE UPPER LAYER ALONG THE STRAIGHT SIDE EDGES THEREOF WITH SAID STRAIGHT EDGES CENTERED WITH RESPECT TO THE CORRESPONDING UNDULATIONS, THE RATIO OF THE WIDTH OF SAID PROJECTIONS AND RECESSES AS MEASURED ALONG SAID STRAIGHT EDGES TO THE MAXIMUM AMPLITUDE THEREOF AS MEASURED FROM SAID STRAIGHT EDGES BEING GREATER THAN FIVE, THE CONFORMATIONS OF THE EDGES OF SAID BASE LAYER BEING SIMILAR ON ALL SIDES, WHEREBY ANY ONE SIDE OF THE TILE MAY BE FITTED AND INTERLOCKED WITH ANY SIDE OF AN ADJOINING SIMILAR TILE IN A FLOOR COVERING INSTALLATION.