Door structure for coking ovens

Claim 1

A coke oven door structure for use in coke ovens, comprising a door frame secured to the oven, a movable door body of a material having a continuous high elasticity of flexure and being exposable to temperature gradients of about 100 degrees Kelvin per meter, a sealing membrane arranged at the periphery of the door body and defining a sealing strip for contacting the door frame with a specific compression force q, and at least two head rails for applying locking force on the door body, the ratio of rigidity (E×I) of the door body to the specific compression force q applied through the sealing strip of the membrane being such as to compensate thermal deformations of the door body predominantly by the locking force of the head rails and by the compression force q applied to the sealing membrane, whereby E is the elasticity module of the material of the door body, I is moment of intertia of the door body, and wherein the ratio ExI/q is equal to or less than the expression ##EQU3## where ##EQU4## and wherein q is the the compression force between the sealing strip of the membrane and the door frame per length unit, H is the distance between the upper and lower head rails, f is the distance between the upper or lower head rail and the upper or lower end of the door, L is the total length of the door and B is the length of the sealing strip of the membrane over the door width.