Heat exhaust suction device for opaque projectors

Claim 1

IN AN OPTICAL PROJECTOR HAVING A GENERALLY RECTANGULAR CASING WITH OPPOSING FRONT, REAR AND SIDE WALLS, AND APERTURES IN SAID WALLS FOR ADMITTING AIR INTO THE CASING, THE COMBINATION COMPRISING AN ENDLESS BELT EXTENDING HORIZONTALLY THROUGH APERTURES IN THE SIDE WALLS FOR CARRYING AN ARTICLE TO BE SUBJECTED TO LIGHT OF A PROJECTION LAMP THROUGH THE CASING, A NOZZLE ATTACHED TO ONE SIDE WALL OF THE CASING AND COMMUNICATING WITH THE INTERIOR OF THE CASING THROUGH ANOTHER APERTURE IN SAID SIDE WALL, SAID NOZZLE HAVING AN EXTERNAL COUPLING, A Y-TYPE FITTING HAVING A COMMON INLET CONNECTED TO SAID COUPLING AND HAVING TWO OUTLET BRANCHES COMMUNICATING WITH SAID INLET, PIPES CONNECTED TO THE RESPECTIVE BRANCHES, ROTOR HOUSINGS CONNECTED TO THE PIPES RESPECTIVELY, AIR MOVING ROTORS IN THE HOUSINGS HAVING AIR INLET SIDES OPEN TO SAID PIPES, AIR OUTLET PIPES CONNECTED TO AIR OUTLET SIDES OF THE HOUSING, A PLATE, A PAIR OF MOTORS MOUNTED ON SAID PLATE AND CONNECTED TO AND RESPECTIVELY DRIVING SAID ROTORS, A POWER SUPPLY, AND A PAIR OF RHEOSTATS RESPECTIVELY IN CIRCUIT WITH SAID POWER SUPPLY AND SAID MOTORS FOR INDEPENDENTLY CONTROLLING THE SPEED OF SAID MOTORS, WHEREBY AIR DRAWN FROM SAID CASING INTO SAID NOZZLES PASSES THROUGH SAID HOUSINGS AND OUT OF SAID AIR OUTLET PIPES.