Coke oven door

Claim 1

APPARATUS FOR SEALING AND UNSEALING COKE OVEN DOORS COMPRISING: A COKE OVER DOOR HAVING LOCKING MEANS IN THE FORM OF TWO UPPER AND LOWER LATCHING DEVICES FOR COACTION WITH DOOR-HOLDING MEANS AND COMPRESSION SPRING MEANS INDIVIDUAL THERETO TO EXERT THE CLOSURE PRESSUREFOR EXERTION OF CLOSURE PRESSURE BETWEEN THE DOOR AND THE DOOR-HOLDING MEANS, AND FOR RELEASE OF SAID CLOSURE PRESSSURE FOR UNLOCKING THE DOOR; SEPARATE FLUID PRESSUREOPERATED MEANS OPAEABLE ON THE RESPECTIVE LATCHING DEVICES FOR EFFECTING SPRING COMPRESSION OPERATION OF THE SAME; A SOURCE OF FLUID PRESSURE FOR ACTUATING SAID FLUID PRESSUREOPERATED MEANS; A COUPLING BETWEEN THE SOURCE OF FLUID PRESSURE AND THE FLUID PRESSURE-OPERATED MEANS OF BOTH SAID LATCHING DEVICES, AND A PRESSURE DELAY VALVE TO CONTROL THE FLUID FLOW TO AND FROM ONE OF THE FLUID PRESSURE OPERATED DEVICES, SAID VALVE BEING SO CONSTRUCTED THAT, WHEN LATCHING TAKE PLACE, THE PRESSURE MEDIUM FIRST EXHAUSTS FROM THE FLUID-PRESSURE-OPERATED DEVICE OF THE LOWER LATCHING DEVICE, FOR THE PURPOSE OF RELEASING THE UPPER LATCHING DEVICE, FOR THE PURPOSE OF RELEASING THE COMPRESSION SPRING MEANS TO ALLOW THE SAME TO SEAL THE DOOR.