Device for closing the filling opening of a coke oven chamber

Claim 1

A closing device for closing a filling opening extending through the ceiling of a coke oven chamber, said closing device comprising: a frame having an opening therethrough, said frame adapted to be positioned on a coke oven chamber ceiling with said opening of said frame aligned with a filling opening of the coke oven chamber ceiling, said frame having formed therein a recessed duct surrounding said opening; a filling opening cover adapted to close said opening, said cover having extending therefrom a substantially annular projection; said duct having therein a displaceable pulverulent material which is capable of being displaced by said projection; such that when said cover is positioned over said frame, said projection extends into said displaceable pulverulent material, thereby forming a first seal closing said filling opening; and said frame having a first inclined sealing surface positioned radially outwardly of said duct, said cover having a second inclined sealing surface positioned radially outwardly of said projection, said first and second inclined sealing surfaces inclining downwardly and inwardly towards the center of the frame opening and being in mutually abutting contact when said projection extends into and displaces said displaceable pulverulent material, thereby forming a second seal which surrounds said first seal and which prevents debris from passing between said cover and said frame into said duct.