SYSTEM FOR COKE OVENS

The invention is concerned with an actuating system for use in a coke oven having a chamber, a vertical gas offtake pipe provided with a cover and an axially extending main connected to the gas offtake pipe and provided with a seal for sealing off the chamber from the main, for consecutively closing the seal of the main and opening the cover of the gas offtake pipe and actuating the cover and seal in the opposite sense and converse sequence. The system of the invention comprises a doublearm lever mounted on a shaft connected to the cover, for pivotal movement about the shaft whereby to open or close the cover, the lever having a weight-loaded arm and an actuating arm; upper and lower draw rods interconnected together by means of a pivot pin for pivotal movement in a vertical plane perpendicular to the axis of the main, the upper draw rod having at its upper end and eyelet for guiding the free end of the actuating lever arm and the lower draw rod being connected to hydraulic actuating means for vertically moving the draw rods; guide means for vertically guiding the pivot pin; and a bell crank lever mounted on the pivot pin for pivotal movement thereabout, the bell crank lever having a slotted arm and an actuating arm connected to the seal. The slotted arm has a longitudinally extending slot for guiding the pin when the slotted arm is in a vertical position and the actuating arm is pivotable about the connection thereof to the seal whereby to close or open the seal. Downward movement of the draw rods first causes closure of the main seal and then opening of the gas offtake pipe cover, and upward movement of the draw rods first causes closure of the cover and then opening of the seal.