Explosion preventing means for coal stoves

Claim 1

IN A COAL STOVE HAVING AN ASHPIT DOOR, AND A COMBUSTION CHAMBER DOOR, THE COMBINATION OF, A DRAFT CONTROLLING VALVE MEANS MOVABLY MOUNTED ON THE ASHPIT DOOR AND HAVING A CONTROLLABLE FLOW AREA, FLUSH VALVE MEANS MOVABLY MOUNTED ON THE COMBUSTION CHAMBER DOOR AND HAVING A CONTROLLABLE FLOW AREA FOR ADMITTING AIR TO THE COMBUSTION CHAMBER TO FLUSH OUT COMBUSTIBLE GAS ACCUMULATIONS RESULTING FROM CLOSING OF THE DRAFT CONTROLLING VALVE MEANS IN SHUTTING DOWN THE COAL STOVE AND VALVE ACTUATING MEANS OPERATIVELY INTERCONNECTING THE DRAFT VALVE MEANS AND FLUSH VALVE MEANS IN SPACED VALVE POSITIONS TO REDUCE THE FLOW AREA OF THE DRAFT VALVE MEANS WITH A LINEAR CLOSING SPEED WHICH IS SLOWER THANT THE LINEAR OPENING SPEED OF THE FLUSH VALVE MEANS DURING INCREASE IN THE FLOW AREA THEREOF SIMULTANEOUSLY WITH SAID REDUCTION OF THE FLOW AREA OF THE DRAFT VALVE MEANS AT A SLOWER RATE TO THEREBY PREVENT COAL STOVE EXPLOSIONS.