Closures for access openings and method of using the same

Claim 1

AN ADJUSTABLE CLOSURE FOR ACCESS OPENINGS INTO UNDERFLOOR WIRING SYSTEMS WHEREIN OPENINGS IN THE TOPS OF JUNCTION BOXES AND HEADER DUCTS PROVIDE ACCESS TO THE SYSTEM AND WHEREIN A FLOOR COVERING MATERIAL IS POSITIONED OVER THE CLOSURE, THE PERIPHERY OF THE OPENING HAVING A PLURALITY OF SPACED BOSSES, EACH BOSS HAVING A THREADED BORE, SAID CLOSURE COMPRISING AN ANNULAR ADJUSTING RING FITTING AROUND THE PERIPHERY OF THE OPENING, SAID RING HAVING A VERTICAL FLANGE AND A HORIZONTAL WEB; A PLURALITY OF SPACED LUGS EXTENDING INWARDLY FROM THE HORIZONTAL WEB OF THE RING, EACH LUG HAVING A SLOT POSITIONED ABOVE A THREADED BORE OF A BOSS ON THE PERIPHERY OF THE OPENING; AN L-SHAPED RING SLEEVE RESTING ON THE PERIPHERY OF THE OPENING, THE HORIZONTAL LEG OF THE SLEEVE EXTENDING UNDER THE ADJUSTING RING AND BEING CEMENTED TO THE PERIPHERY OF THE OPENING AND THE VERTICAL LEG OF THE SLEEVE ENCIRCLING THE VERTICAL SECTION OF THE ADJUSTING RING; A PLURALITY OF ADJUSTING SCREWS WHICH ENGAGE THE THREADED BORES IN THE BOSSES ON THE PERIPHERY OF THE OPENING, THE ADJUSTING SCREWS HAVING A GROOVE DIMENSIONED TO RECEIVE THE SLOTTED PORTION OF A LUG OF THE HORIZONTAL WEB OF THE ADJUSTING RING, WHEREBY MOVEMENT OF THE ADJUSTING SCREW IS IMPARTED TO THE ADJUSTING RING; AN ANNULAR L-SHAPED FLUSH PAN RESTING ON THE WEB OF THE ADJUSTING RING, SAID FLUSH PAN BEING DIMENSIONED SO THAT THE VERTICAL LEG EXTENDS ABOVE THE VERTICAL FLANGE OF THE ADJUSTING RING A DISTANCE EQUAL TO THE THICKNESS OF THE FLOOR COVERING; AND A COVER PLATE RESTING ON THE FLUSH PAN AND FASTENED TO THE ADJUSTING RING.