Melting furnace back wall construction

Claim 1

IN A FURNACE BACK WALL FOR SUSPENSION OVER A FURNACE CHARGING BAY, TRANSVERSELY-EXTENDING SPACED-APART SUPPORT BEAMS PROVIDING A STRUCTURAL SUPPORT FOR THE BACK WALL, LONGITUDINALLY-EXTENDING SPACED-APART HANGER CASTINGS MOUNTED FOR SLIDING MOVEMENT ALONG SAID SUPPORT BEAMS EACH HANGER CASTING HAVING A BOX-LIKE SHAPE IN SECTION AND A BOTTOM PROVIDED WITH A SLOTTED PORTION LONGITUDINALLY THEREALONG, INVERTED U-SHAPED METAL HANGERS EACH HAVING A BODY PORTION ADAPTED TO EXTEND INTO THE SLOTTED PORTION OF ONE OF SAID HANGER CASTINGS AND HAVING SIDE LUGS ADJACENT OPPOSITE ENDS OF SAID BODY PORTION TO SPAN THE SLOTTED PORTION AND RIDE LONGITUDINALLY ALONG THE BOTTOM OF SAID HANGER CASTING, REFRACTORY TILE MEMBERS EACH BEING OF SUBSTANTIALLY RECTANGULAR SHAPE AND HAVING OPPOSED SUBSTANTIALLY PLANAR WIDE SIDE FACES AND OPPOSED RELATIVELY NARROW EDGE FACES EXTENDING BETWEEN THE SIDE FACES, EACH HANGER HAVING A PAIR OF OPPOSITE LEGS EXTENDING FROM SAID BODY PORTION, ONE OF SAID LEGS HAVING A LATCHING PORTION, EACH TILE MEMBER HAVING A PAIR OF OPPOSED SUSPENSION SLOT PORTIONS; ONE SUSPENSION SLOT PORTION BEING OPEN TO AN OUTER END OF THE TILE MEMBER, HAVING A LATCHING PORTION, AND EXTENDING SUBSTANTIALLY CENTRALLY OF ONE SIDE FACE TO RECEIVE SAID ONE LEG AND ITS LATCHING PORTION OF ONE OF SAID HANGERS; THE OTHER SUSPENSION SLOT OF THE TILE MEMBER BEING ALSO OPEN TO THE OUTER END THEREOF AND EXTENDING SUBSTANTIALLY CENTRALLY OF ITS OTHER SIDE FACE TO RECEIVE THE OTHER LEG PORTION OF SAID ONE HANGER, SO THAT THE