Apparatus having a controllable vent

Claim 1

IN COMBINATTION WITH A SEPARATING APPARATUS OF THE CHARACTER DESCRIBED ADAPTED TO RECEIVE A GAS STREAM HAVING ENTRAINED PARATICLES THEREIN AND SEPARATE SUCH PARTICLES THEREFROM, AND INCLUDING A SEPARATING CHAMBER HAVING TOP AND SIDE WALLS, A VENT OPENING IN THE TOP WALL THEREOF, AND INLET PASSAGEWAY FOR RECEIVING SAID GAS STREAM, AND HAVING A FORWARD END PORTION EXTENDING TANGENTIALLY OF THE SIDEWALLS OF SAID SEPARATING CHAMBER, AND A REAR END PORTION CURVING CONVEXLY INTO THE SIDE WALLS OF SAID CHAMBER TO INTRODUCE A FLOW CIRCUMFERENTIALLY OF SAID SEPARATING CHAMBER; A COVER PLATE FOR SAID VENT OPENING; FIRST ARM MEANS MOUNTING SAID COVER PLATE FOR MOVEMENT BETEWEEN A FIRST EXTREME OPERATING POSITION WHERE SAID COVER PLATE CLOSES SAID VENT OPENING TO A SECOND EXTREME OPERATING POSITION WHERE SAID COVER PLATE OPENS SAID VENT OPENING; A VANE DISPOSED TRANSVERSELY IN SAID INLET PASSAGEWAY; SECOND ARE MEANS MOUNTING SAID VANE FOR MOVEMENT IN RESPONSE TO PRESSURES EXERTED THEREON BY SAID GAS STREAM FROM A FIRST POSITION WHERE SAID VANE BLOCKS SAID PASSAGEWA BY A PREDETERMINED AMOUNT TO A SECOND POSITION WHERE SAID VANE BLOCKS SAID PASSAGEWAY BY AN AMOUNT LESS THAN SAID PREDETERMINED AMOUNT; A MECHANICAL CONNECTION MEANS FORMING PART OF SAID FIRST AND SECOND ARM MEANS FOR MOVING SAID FIRST ARM MEANS AND THEREBY SAID COVER PLATE PROPORTIONATELY TOWARD SAID SECOND POSITION THEREOF SIMULTANEOUSLY WITH AND IN RESPONSE TO MOVEMENT OF SAIDVANE TOWARD SAID SECOND POSITION THEREOF CAUSED BY PRESSURES EXERTED ON SAID VANE BY SAID GAS STREAM, MEANS FOR CONTINUOUSLY SIMULTANEOUSLY URGING SAID COVER PLATE TOWARD SAID FIRST POSITION THEREOF AND SAID VANE TOWARD SAID FIRST POSITION THEREOF, REGARDLESS OF THE POSITION OF SAID COVER PLATE WHEREBY MOVEMENT OF SAID VANE BETWEEN SAID FIRST AND SECOND POSITIONS THEREOF IN RESPONSE TO PRESSURES EXERTED THEREON BY SAID GAS STREAM CAUSED PROPORTIONAL MOVEMENT OF SAID COVER PLATE AND CORRESPONDING PROPORTIONAL OPENING AND CLOSING OF SAID VENT OPENING, SAID MEANS FOR BIASING COMPRISING A SPRING MEANS HAVING ONE END FIXED TO SAID TOP WALL AND THE OTHER END FIXED TO SAID COVER PLATE, AND COOPERATING STOP MEANS CARRIED RESPECTIVELY BY SAID COVER PLATE AND SAID TOP WALL FOR PREVENTING MOVEMENT OF SAID COVER PLATE PAST SAID FIRST POSITION UNDER THE BIASING ACTION OF SAID SPRING MEANS.