Light construction plug for coke oven doors

Claim 1

A coke oven door in combination with a coke oven having a coke oven chamber and spaced apart wall portions defining a chamber opening therebetween; said coke oven door comprising a door body for engaging over the chamber opening to close the opening; at least a first and a second box-like metallic hollow body connected to and supported by said door body and closely engaged with each other, said first hollow body being adjacent to said door body and said second hollow body being spaced away from said door body so that said at least first and second hollow body extend serially into the chamber between the wall portions to form a plug extending inwardly of the chamber with said door body engaged over the chamber opening with the hollow bodies and said door body are in a closed position; said first hollow body including a pair of laterally spaced outside walls and said second hollow body including a pair of laterally spaced outside walls, said outside walls of said first hollow body cooperating with said outside walls of said second hollow body and said chamber spaced apart wall portions to define laterally spaced concave and vertically extending gas pressure equalizing channels; said at least first and second hollow body being detachable from each other and detachably connected to said door body to allow for replacement whereby a horizontal cross-sectional shape of said pressure equalizing channels can be changed.