Regulation of the collection of gases from the oxygen refining pig iron

Claim 1

IN A DEVICE FOR CONTROLLING THE CAPTATION WITHOUT COMBUSTION OF THE GASES RESULTING FROM THE REFINING OF PIG IRON THROUGH OXYGEN COMPRISING A CONVERTER HAVING AN OUTLET FOR THE GASES, A HOOD POSITIONED GENERALLY IN AXIAL ALIGNMENT WITH SAID OUTLET, SAID HOOD HAVING TWO ANNULAR TELESCOPING SECTIONS, THE OUTER SECTION BEING POSITIONED IN EXTERNAL TELESCOPING RELATIONSHIP WITH SAID OUTLET, SAID OUTER SECTION HAVING A DIAMETER APPRECIABLY GREATER THAN THE DIAMETER OF SAID OUTLET, THE INNER SECTION BEING POSITIONED IN AXIALLY SPACED RELATION TO SAID OUTLET AND HAVING A DIAMETER GENERALLY EQUAL TO THE DIAMETER OF THE OUTLET, CLOSURE MEANS POSITIONED BETWEEN THE TWO SECTIONS REMOTE FROM SAID OUTLET FOR CLOSING THE SPACE BETWEEN THE TWO SECTIONS THEREBY FORMING AN ANNULAR AREA RADIALLY OUTWARDLY OF SAID OUTLET CLOSED AT THE END OF THE AREA REMOTE FROM THE OUTLET, SAID AREA FORMING A QUIESCENT ZONE FOR GASES, MEANS POSITIONED IN SAID ANNULAR AREA FOR DETECTING THE PRESSURE OF THE GASES IN SAID AREA, AND MEANS INCLUDING SAID DETECTING MEANS FOR MAINTAINING A SUBSTANTIALLY TAIN A PREDETERMINED HEIGHT RELATIONSHIP BETWEEN THE ANNULAR AREA AND THE ATMOSPHERE.