Abstract: A sealing frame of generally Z-shaped cross-section, extending all around a peripheral flange of a coke-oven door, has an inner rim hugging that flange and a cantilevered web resiliently bearing with a free knife edge upon a door frame of an associated coking chamber. The rim is held against the door flange by recessed clamping plates which are shiftable, together with the sealing flange, in a direction perpendicular to the door opening under pressure of cams on the inner surface of a multiplicity of retaining disks overhanging these plates with shafts rotatably lodged in the door flange.