Coke oven buckstay structure

Claim 1

IN A COKE OVEN BATTERY COMPRISING A MASONRY UPPER SECTION WITH ELONGATED COKING CHAMBERS THEREIN EXTENDING BETWEEN THE OPPOSITE SIDES OF THE BATTERIES AND WITH HEATING WALLS AT THE SIDES OF THE COKING CHAMBERS AND COMPRISING A LOWER MASONRY SECTION WITH CHAMBERS THEREIN FOR PREHEATING GASEOUS COMBUSTION MATERIAL, SAID UPPER SECTION HAVING A HIGHER AVERAGE THERMAL EXPANSION IN THE HORIZONTAL DIRECTION TRANSVERSE TO THE LENGTH OF THE BATTERY THAN SAID LOWER SECTION, THE IMPROVEMENT COMPRISING VERTICAL BUCKSTAYS AT THE SIDES OF THE BATTERY EACH COMPRISING A LOWER SECTION AND AN UPPER SCTION MOVABLE RELATIVE TO SAID LOWER SECTION AND YIELDING MEANS DIRECTLY INTERCONNECTING THE ADJACENT UPPER AND LOWER BUSCKSTAY SECTIONS FOR DIFFERENTIAL MOVEMENT OF THE SECTIONS, THE SAID CONNECTION DIRECTLY OPPOSING THE MOVEMENT OF THE UPPER SECTION RELATIVE TO THE LOWER SECTION, THE ASSOCIATED MEANS FOR REGULATING THE RELATIVE MOVEMENTS OF THE ADJACENT UPPER AND LOWER BUCKSTAY SECTIONS.