Contra-flow ventilating apparatus

Claim 1

A CONTRA-FLOW VENTILATING FAN ASSEMBLY ADAPTED FOR USE IN INDUSTRIAL AIR CIRCULATING SYSTEMS COMPRISING,, A FIRST FIXED CYLINDRICAL AIR CONNDUCTING OUTER CASING OF CONSTANT DIAMETER, A SECOND FIXED CYLINDRICAL INNER CASING OF LESSER DIAMETER THAN SAID OUTER CASING MOUNTED TO AND CONCENTRICALLY OF SAID OUTER CASING, SAID INNER CASING BEING OF SLIGHTLY LESSER LENGTH THAN SAID OUTER CASING AND HAVING ONE END DISPOSED BELOW THE CORRESPONDING END OF SAID OUTER CASING, A CONTRA-FLOW FAN BLADE ASSEMBLY, A FLAT TTOP PLATE AND AN INWARDLY TAPERING BOTTOM INNER AND OUTER CASINGS, MEANS TO SUPPORT SAID FAN ASSEMBLY, A FLAT TOP PLATE AND AN INWARDLY TAPERING BOTTOM COLLAR OF ANNULAR FORMATION, SAID FAN ASSEMBLY HAVING A FIRST FAN WHEEL HAVING FIXED TAPERED FAN BLADES EXTENDING RADIALLY INWARDS BETWEEN SAID FLAT TOP PLATE AND SAID INWARDLY TAPERING BOTTOM COLLAR OF ANNULAR FORMATION, AND A SECOND SET OF FAN BLADES MOUNTED AT THE ROOTS TO SAID FAN WHEEL ANNULAR COLLAR SO AS TO EXTEND RADIALLY OUTWARDS THEREFROM AND BEING INCLINED WHEREBY WHEN ROTATED WITH SAID FAN WHEEL TO CAUSE A MOVEMENT OF AIR IN A DIRECTION OPPOSITE TO THAT CAUSED BY SAID FAN WHEEL BLADES, MEANS SUPPORTING SAID INER CYLINDRICAL CASING CONCENTRICALLY OF AND RELATIVE TO SAID OUTER CASING PERMITTING FREE ROTATION OF SAID SECOND FAN BLADE ASSEMBLY WITHIN AN ANNULAR SPACE BETWEEN SAID INNER ANND OUTER CASINGS, DRIVING MEANS INCLUDING A DRIVING MOTOR PARTITIONED FROM AND MOUNTED DIRECTLY ABOVE SAID CONTRAFLOW FAN ASSEMBLY WITH A CONNECTION TO SAID FIRST FAN WHEEL, A FIXED ANNULAR AIR FLOW DEFLECTING MEANS SURROUNDING SAID FAN WHEEL AND HAVING A PORTION EXTENDING INWARDLY BETWEEN TTHE OUTER PERIPHERY OF SAID FAN WHEEL AND THE BLADES OF SAID SECOND BLADE ASSEMBLY THEREBY BEING ADAPTED TO MAINTAIN SEPARATE THE OPPOSITE AIR FLOWS PASSING THROUGH SAID INNER ANNND OUTER CASINGS UNDER THE INFLUENCE OF SAID FIRST FAN WHEEL AND SECOND BLADE ASSEMBLY, AND DAMPER MEANS LOCIAT ED BENEATH SAID SECOND BLADE ASSEMBLY TO CONTROL THE SAID SEPARATE OPPOSITE AIR FLOWS.