Apparatus for thermal treatment of metal

Claim 1

A JET COOLING UNIT OF THE TYPE DESCRIBED COMPRISING A HOUSING ADAPTED TO BE REMOVABLE SUPPORTED ALONGSIDE A PATH OF MOVEMENT OF STRIP MATERIAL, A MOTER DRIVEN HIGH PRESSURE RISE SUPPORTED ON SAID HOUSING AND HAVING AN INLET AND AN OUTLET, THE HOUSING BEING PROVIDED WITH A PLENUM CHAMBER CONNECTED IN FLOW COMMUNICATION WITH THE FAN OUTLET, SAID PLENUM CHAMBER HAVING A GENERALLY FLAT FACE ADAPTED TO BE DISPOSED SUBSTANTIALLY PARALLEL TO THE PATH OF STRIP MOVEMENT, ORIFICE MEANS FOR THE HIGH VELOCITY DISCHARGE OF ATMOSPHERE FROM THE PLENUM CHAMBER SUBSTANTIALLY AT RIGHT ANGLES TOWARD A NEXT ADJACENT STRIP PATH, SAID ORIFICE MEANS INCLUDING AN ELONGATED NARROW SLOT EXTENDING LATERALLY OF THE STRIP PATH AND A PLUALITY OF ORIFICES DISPOSED ON OPPOSITE SIDES OF THE SLOT WITH THE ORIFICE ON EACH SIDE OF THE SLOT BEING ARRANGED SUBSTANTIALLY IN A ROW EXTENDING PARALLEL TO THE SLOT THE HOUSING FURTHER BEING PROVIDED WITH ENCLOSED SUCTION CHAMBERS SPACED APART ON OPPOSITE SIDES OF THE ORIFICE MEANS AND LONGITUDINALLY THEREOF IN THE DIRECTION OF STRIP MOVEMENT PAST THE UNIT, SAID SUCTION CHAMBERS BEING CONNECTED IN FLOW COMMUNICATION WITH THE FAN INLET TO PULL SPENT ATMOSPHERE FROM THE SURFACE OF THE STRIP FOR RECIRCULATION, AND HEAT EXCHANGER MEANS DISPOSED WITHIN THE HOUSING AND IN THE PATH OF MOVEMENT OF ATMOSPHERE THROUGH THE HOUSING.