Air conditioning apparatus

Claim 1

IN AN AIR CONDITIONING SYSTEM, THE COMBINATION OF, A ROOM WITHIN A BUILDING HAVING A TOP WALL AND A FALSE CEILING SPACED THEREBELOW AND COOPERATING THEREWITH TO DEFINE A PLENUM SPACE ABOVE THE ROOM, A PLURALITY OF ELECTRIC LIGHTING FIXTURES LATERALLY SPACED APART ACROSS SAID CEILING AND HAVING TROFFERS SET INTO THE CEILING AND SAID PLENUM SPACE AND SECURED TO THE CEILING, SAID TROFFERS HAVING LAMP BULBS THEREIN LIGHTING SAID ROOM AND HEATING SAID TROFFERS SO AS TO HEAT THE AIR IN SAID PLENUM SPACE AND ADJACENT SAID CEILING, AN INLET PASSAGE THROUGH SAID CEILING ESTABLISHING COMMUNICATION BETWEEN THE UPPER PART OF SAID ROOM ADJACENT SAID CEILING AND SAID PLENUM SPACE FOR THE UPWARD FLOW OF AIR FROM THE ROOM INTO SUCH SPACE, AN OUTLET PASSAGE EXTENDING DOWNWARDLY THROUGH SAID CEILING FOR THE DISCHARGE OF CONDITIONED AIR INTO SAID ROOM, A MAIN DUCT DISPOSED IN SAID PLENUM SPACE AND HAVING A BRANCH OPENING INTO SAID PLENUM SPACE, A BRANCH DUCT DISPOSED WITHIN AND EXTENDING THROUGH THE PLENUM SPACE AND ESTABLISHING COMMUNICATION BETWEEN SAID OUTLET PASSAGE AND SAID MAIN DUCT AT A POINT DOWNSTREAM FROM SAID BRANCH, MEANS FOR SUPPLYING PRIMARY AIR UNDER PRESSURE TO THE INLET OF SAID MAIN DUCT, MEANS WITHIN SAID MAIN DUCT ACTIVATED BY THE FLOW OF SAID PRIMARY AIR THERETHROUGH TO INDUCE THE ASPIRATION OF HEATED AIR OUT OF SAID PLENUM SPACE AND INTO SAID MAIN DUCT THROUGH SAID BRANCH AND THEREBY INDUCE THE UPWARD FLOW OF AIR FROM THE ROOM THROUGH SAID INLET PASSAGE AND INTO SAID PLENUM SPACE, A DAMPER SELECTIVELY ADJUSTABLE TO CONTROL THE RATE OF ASPIRATION OF HEATED AIR OUT OF SAID SPACE THROUGH SAID BRANCH, A SECOND DAMPER SELECTIVELY ADJUSTABLE TO CONTROL THE RATE OF FLOW OF PRIMARY AIR INTO SAID MAIN DUCT, A REVERSIBLE POWER ACTUATOR HAVING A DRIVEN MEMBER MOVABLE BACK AND FORTH, A THERMOSTAT RESPONSIVE TO TEMPERATURE CHANGES IN SAID ROOM AND CONTROLLING SAID ACTUATOR TO DISPOSE SAID MEMBER AT ALL TIMES IN A POSITION CORRESPONDING TO THE PREVAILING VALUE OF SUCH TEMPERATURE, AND MEANS COUPLING SAID MEMBER AND THE RESPECTIVE PRIMARY AND ASPIRATED AIR CONTROL DAMPERS FOR MOVEMENT OF THE LATTER IN UNISON BUT IN OPPOSITE DIRECTIONS WHEREBY TO CHANGE THE FLOW OF SAID PRIMARY AIR AND REVERSELY CHANGE THE FLOW OF ASPIRATED AIR BY CORRESPONDING AMOUNTS AND THEREBY MAINTAIN A CONSTANT VOLUME OF THE MIXED AIR FLOWING INTO SAID ROOM WHILE UTILIZING THE HEAT FROM SAID LAMP BULBS TO TEMPER THE AIR DELIVERED INTO SAID ROOM.