Coke oven door having outer and inner sealing blades

In a coke oven door for closing an opening to an oven chamber of a coke oven, the door being of the type having a door body, a door stopper mounted to the door body on a side thereof adapted to be adjacent the oven chamber and designed to extend into the oven chamber, the door being for a coke oven having a door frame with a sealing surface bordering the opening, the door having at least one planar sealing diaphragm secured to the door body between the door body and the door stopper, the diaphragm having sealing blades adapted to extend, along its periphery, inwardly against the sealing surface of the door frame, sealing blades being mounted to the diaphragm about the outer peripheral area thereof, and spring means for urging the sealing blades against the door frame in order to seal the opening, the improvement comprising two sealing blades extended in parallel to each other adapted to be applied against the sealing surface of the door frame, said two sealing blades comprising an outer sealing blade and an inner sealing blade spaced inwardly of said outer sealing blade along the periphery of the diaphragm, elastic means formed in the sealing diaphragm between the door body and said inner sealing blade, and between said two sealing blades for resiliently moving the sealing diaphragm responsive to the spring means so that said two sealing blades can be pressed into contact with the door frame under unequal forces.