US3346007A - Gas flow control louvres - Google Patents

Gas flow control louvres Download PDF

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Publication number
US3346007A
US3346007A US302325A US30232563A US3346007A US 3346007 A US3346007 A US 3346007A US 302325 A US302325 A US 302325A US 30232563 A US30232563 A US 30232563A US 3346007 A US3346007 A US 3346007A
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United States
Prior art keywords
slats
slat
closed
control rod
louvre
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Expired - Lifetime
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US302325A
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Agnon Shmuel
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State of Israel
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State of Israel
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/15—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre with parallel simultaneously tiltable lamellae
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/165—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with a plurality of closure members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/006—Safety valves; Equalising valves, e.g. pressure relief valves specially adapted for shelters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/745—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity the air flow rate increasing with an increase of air-current or wind pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7838—Plural
    • Y10T137/7839—Dividing and recombining in a single flow path
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/8741—With common operator
    • Y10T137/87442—Rotary valve
    • Y10T137/87467—Axes of rotation parallel
    • Y10T137/87475—Adjacent plate valves always parallel

Definitions

  • This invention relates to gas flow control louvres of V the kind having a plurality of pivotal slats which pivot into an open position under the pressure of through flowing gas and which returns to a closed position when the pressure of the gas falls below a pre-determined minimum level.
  • Such louvres will hereinafter be referred to as gas flow control louvres of the kind specified.
  • each slat is pivotable about an axis parallel to the longitudinal axis of the slat and displaced from the position occupied by the slats when closed, the edges of each slat being.
  • the slats are normally biased into a closed position.
  • This biasing can be effected directly by gravity or by some other mechanical means such as for example spring biasing. Irrespective of the form of biasing employed the fact that the slats are pivoted eccentrically ensures that, the biasing exerts on them a susbtantial force in the direction of closing.
  • FIG. 1 is a longitudinal sectional elevation of a vertically disposed control louvre in accordance with the present invention
  • FIG. 2 is a cross-sectional elevation of a first form of horizontally disposed control louvre in accordance with the invention.
  • FIG. 3 is a cross-sectional elevation of a second form of horizontally disposed control louvre in accordance with the invention.
  • a wall 1 has formed therein a ventilation opening 2 which is .adapted to be closed by means of a control louvre 3.
  • the control'louvre comprises a plurality of elongated rectangular sl-ats 4.
  • Each slat 4 is secured, at a spaced apart position thereof to ,a pair of pivoting brackets 5 (only one being shown).
  • One end of each bracket 5 is bolted to a slat 4 whilst the other end is pivoted to a common control rod 6.
  • Formed integrally with each bracket 5 and branching olf therefrom is a branch limb 7 the end of which is pivot-ally mounted on a web 8 of an elongated angle iron 9.
  • Each angle iron 9 is secured at its end to a frame 10 of the aperture 2.
  • the uppermost angle iron 9 is also secured to a bracket 11 which depends from the upper edge of the frame 10 of the aperture 2.
  • each slat pivots about an axis 7a which is parallel to the longitudinal axis of the slat but is spaced away from the position occupied by the slat when closed.
  • each slat 4 is provided with a suitable sealing strip 12 which bears against the seating provided by the'vertical limb of the angle irons 9 and the free limb of the frame 10.
  • a stop member 13 is disposed below the common control rod 6 and in the path thereof. This stop member is secured to a rotating lever 14 whose movement is controlled by a motor 15.
  • the function of the control louvre is to allow the flow of gas (usually air) through the aperture 2 in the direction of the arrow 16 whilst preventing the backfiow of gas in the reverse direction.
  • gas usually air
  • the slats 4 tend to pivot into an open position as shown by 4' in the drawings. Any movement of the slats is of course accompanied by movement of the control rod 3 and a downward movement of the control rod is limited by the position of the stop member 13 As shown in the drawings the position of the stop member 13 is such as to prevent any opening at all of the slats 4.
  • the position of the stop member 13 is automatically varied by the motor 15 as a result of information fed to the motor concerning the requirements at ,any particular time for the -fiow of the gas in the direction 16.
  • the motor 15 automatically lowers the stop member 13 so as to allow for an increased degree of opening of the louvre.
  • the stop member is raised thereby tending to close the louvre.
  • the motor 15 and its associated stop member 13 operates to control automatically the degree of opening of the louvre.
  • the louvre which is substantially of the same construction as that shown in FIG. 1 is mounted horizontally.
  • the slats are biased by gravity into a closed position, the degree of opening of slats being again controlled by a motor controlled stop member.
  • the eccentric mounting of each slat ensures that it bears tightly against its seating when closed.
  • a gas flow control louvre comprising a flange having a plurality of openings, the periphery of each of said openings defining a seat, a plurality of pivotal slats adapted to pivot into an open position with respect to said openings under the pressure of through flowing gas and to return to a closed position when the pressure of the gas falls below a predetermined minimum level, each of said slats being pivotable about an axis parallel to the longitudinal axis of the slats and displaced from the position occupied by the slats when closed, the edges of each slat being respectively associated with seatings against which they bear tightly when closed, each of said slats having an actuating lever associated therewith, each of said levers having an arm secured at one end to an associated slat and extending outwardly therefrom forming an acute angle with respect thereto, said lever having a second arm secured ,at one end to said first arm and extending outwardly therefrom in direction at right

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Air-Flow Control Members (AREA)

Description

-ot.,1'0', 1967 I a t cm 3,346,007-
7 Gas FLOW CONTROL LOUVRES Fil ed Aug. 15, 19s: I Y 2 Sheets-Sheet 1 I lrwenlor SHMUEL A GNON v A ttorneys @ZWZM" Oct. 10,1967 YS.AGNON 3,345,007
GAS now CONTROL LOUVRES Filed Aug. 15, 1963 2' Sheets-Sheet'z lnvenlo d Q New A llomeys United States Patent 3,346,007 GAS FLOW CONTROL LOUVRES Shmuel Agnon, Haifa, Israel, assignor to The State of Israel, Ministry of Defence, Hakiria, Tel Aviv, Israel Filed Aug. 15, 1963, Ser. No. 302,325 Claims priority, application Israel, Aug. 22, 1962, 17,838 2 Claims. (Cl. 137--512.1)
This invention relates to gas flow control louvres of V the kind having a plurality of pivotal slats which pivot into an open position under the pressure of through flowing gas and which returns to a closed position when the pressure of the gas falls below a pre-determined minimum level. Such louvres will hereinafter be referred to as gas flow control louvres of the kind specified.
With such control louvres considerable difiiculty is experienced in ensuring that the louvre c'loses tightly when the pressure of gas has fallen below this minimum value. It is of a particular importance to ensure that such tight closing takes place so as to prevent any possible backfiow through the louvre of noxious or contaminated gases.
It is an object of the present invention to provide a new and improved gas flow control louvre of the kind specified in which the above mentioned difficulties are substantially overcome.
According to the present invention there is provided a gas flow control louvre of the kind specified wherein each slat is pivotable about an axis parallel to the longitudinal axis of the slat and displaced from the position occupied by the slats when closed, the edges of each slat being.
respectively associated with seatings against which they bear tightly when closed.
With such a control louvre in accordance with the invention the slats are normally biased into a closed position. This biasing can be effected directly by gravity or by some other mechanical means such as for example spring biasing. Irrespective of the form of biasing employed the fact that the slats are pivoted eccentrically ensures that, the biasing exerts on them a susbtantial force in the direction of closing.
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal sectional elevation of a vertically disposed control louvre in accordance with the present invention,
FIG. 2 is a cross-sectional elevation of a first form of horizontally disposed control louvre in accordance with the invention, and
FIG. 3 is a cross-sectional elevation of a second form of horizontally disposed control louvre in accordance with the invention.
As seen in FIG. 1 of the drawings a wall 1 has formed therein a ventilation opening 2 which is .adapted to be closed by means of a control louvre 3. The control'louvre comprises a plurality of elongated rectangular sl-ats 4. Each slat 4 is secured, at a spaced apart position thereof to ,a pair of pivoting brackets 5 (only one being shown). One end of each bracket 5 is bolted to a slat 4 whilst the other end is pivoted to a common control rod 6. Formed integrally with each bracket 5 and branching olf therefrom is a branch limb 7 the end of which is pivot-ally mounted on a web 8 of an elongated angle iron 9. Each angle iron 9 is secured at its end to a frame 10 of the aperture 2. The uppermost angle iron 9 is also secured to a bracket 11 which depends from the upper edge of the frame 10 of the aperture 2. Thus each slat pivots about an axis 7a which is parallel to the longitudinal axis of the slat but is spaced away from the position occupied by the slat when closed.
The edges of each slat 4 are provided with a suitable sealing strip 12 which bears against the seating provided by the'vertical limb of the angle irons 9 and the free limb of the frame 10.
A stop member 13 is disposed below the common control rod 6 and in the path thereof. This stop member is secured to a rotating lever 14 whose movement is controlled by a motor 15.
In use, the function of the control louvre is to allow the flow of gas (usually air) through the aperture 2 in the direction of the arrow 16 whilst preventing the backfiow of gas in the reverse direction. When the flow of air in the'direction of the arrow 16 exceeds a predetermined rate the slats 4 tend to pivot into an open position as shown by 4' in the drawings. Any movement of the slats is of course accompanied by movement of the control rod 3 and a downward movement of the control rod is limited by the position of the stop member 13 As shown in the drawings the position of the stop member 13 is such as to prevent any opening at all of the slats 4. The position of the stop member 13 is automatically varied by the motor 15 as a result of information fed to the motor concerning the requirements at ,any particular time for the -fiow of the gas in the direction 16. Thus, when conditions to the left of louvre are such as to require an increased flow of gas to the louvre the motor 15 automatically lowers the stop member 13 so as to allow for an increased degree of opening of the louvre. Conversely when a reduced or zero supply of gas is required the stop member is raised thereby tending to close the louvre. Thus the motor 15 and its associated stop member 13 operates to control automatically the degree of opening of the louvre. On the other hand, if at any time whilst the louvre is open the flow of gas thereto drops suddenly below a predetermined minimum the slats automatically fall back into their closed position. Furthermore, by virtue of the fact that the slats are eccentrically mounted the slats are firmly pressed with their sealing strips against the seatings provided by the vertical limbs of the brackets 9 and the tree limbs of frame 10. Thus it is ensured that the possibility of the flow of gas in the direction from left to right is substantially prevented.
In the arrangement shown in FIG. 2 of the drawings the louvre, which is substantially of the same construction as that shown in FIG. 1 is mounted horizontally. In this case too the slats are biased by gravity into a closed position, the degree of opening of slats being again controlled by a motor controlled stop member. As in the arrangement shown in FIG. 1 the eccentric mounting of each slat ensures that it bears tightly against its seating when closed.
In the arrangement shown in FIG. 3 however, the normal tendency of the slat is to open under gravity. In order to overcome this tendency the control rod is biased by a tension spring 21 against movement to the right, the effect of the tension spring therefore being communicated to the slats and urging them into a closed position as shown in the drawings. This biasing elfect of the spring is overcome by a throughflow of gas in the direction of the arrow. Again as in the case of the previous embodiment, by virtue of the eccentric mounting of the slats, the slats are firmly pressed against their seating under the influence of the biasing force.
3 I claim: 1. A gas flow control louvre comprising a flange having a plurality of openings, the periphery of each of said openings defining a seat, a plurality of pivotal slats adapted to pivot into an open position with respect to said openings under the pressure of through flowing gas and to return to a closed position when the pressure of the gas falls below a predetermined minimum level, each of said slats being pivotable about an axis parallel to the longitudinal axis of the slats and displaced from the position occupied by the slats when closed, the edges of each slat being respectively associated with seatings against which they bear tightly when closed, each of said slats having an actuating lever associated therewith, each of said levers having an arm secured at one end to an associated slat and extending outwardly therefrom forming an acute angle with respect thereto, said lever having a second arm secured ,at one end to said first arm and extending outwardly therefrom in direction at right angles to the associated slat when the latter is closed, the free end of said second arm being pivotally mounted to the frame to define the pivotal mount for the associated slat, a control rod'extending parallel to the frame, the free end of each of said first arms of said lever being pivotally connected to said control rod at spaced positions along its length and a displaceable abutment member in the path of movement of one end of said control rod to limit the movement of the latter.
2. A gas flow control louvre according to claim 1, wherein the displacement of said abutment is effected by means of a motor.
References Cited UNITED STATES PATENTS 1,099,689 6/1914 Broadhurst et al. 137-512.1 X 1,588,445 6/1926 Chandler 25l287 X 3,123,098 3/1964- Bishop 137601 WILLIAM F. ODEA, Primary Examiner.
D. I. ZOBKIW, Assistant Examiner.

Claims (1)

1. A GASL FLOW CONTROL LOUVRE COMPRISING A FLANGE HAVING A PLURALITY OF OPENINGS, THE PERIPHERY OF EACH OF SAID OPENINGS DEFINING A SEAT, A PLURALITY OF PIVOTAL SLATS ADAPTED TO PIVOT INTO AN OPEN POSITION WITH RESPECT TO SAID OPENINGS UNDER THE PRESSURE OF THROUGH FLOWING GAS AND TO RETURN TO A CLOSED POSITION WHEN THE PRESSURE OF THE GAS FALLS BELOW A PREDETERMINED MINIMUM LEVEL, EACH OF SAID SLATS BEING PIVOTABLE ABOUT AXIS PARALLEL TO THE LONGITUDINAL AXIS OF THE SLATS AND DISPLACED FROM THE POSITION OCCUPIED BY THE SLATS WHEN CLOSED, THE EDGES OF EACH SLAT BEING RESPECTIVELY ASSOCIATED WITH SEATINGS AGAINST WHICH THEY BEAR TIGHTLY WHEN CLOSED, EACH OF SAID SLATS HAVING AN ACTUATING LEVER ASSOCIATED THEREWITH, EACH OF SAID LEVERS HAVING AN ARM SECURED AT ONE END TO AN ASSOCIATED SLAT AND EXTENDING OUTWARDLY THEREFROM FORMING AN ACUTE ANGLE WITH RESPECT THERETO, SAID LEVER HAVING A SECOND ARM SECURED AT ONE END TO SAID FIRST ARM AND EXTENDING OUTWARDLY THEREFROM IN DIRECTION AT RIGHT ANGLES TO THE ASSOCIATED SLAT WHEN THE LATTER IS CLOSED, THE FREE END OF SAID SECOND ARM BEING PIVOTALLY MOUNTED TO THE FRAME TO DEFINE THE PIVOTAL MOUNT FOR THE ASSOCIATED SLAT, A CONTROL ROD EXTENDING PARALLEL TO THE FRAME, THE FREE END OF EACH OF SAID FIRST ARMS OF SAID LEVER BEING PIVOTALLY CONNECTED TO SAID CONTROL ROD AT SPACED POSITIONS ALONG ITS LENGTH AND A DISPLACEABLE ABUTMENT MEMBER IN THE PATH OF MOVEMENT OF ONE END OF SAID CONTROL ROD TO LIMIT THE MOVEMENT OF THE LATTER.
US302325A 1962-08-22 1963-08-15 Gas flow control louvres Expired - Lifetime US3346007A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604458A (en) * 1969-02-13 1971-09-14 Modine Mfg Co Temperature compensating damper structure
US3699873A (en) * 1971-06-14 1972-10-24 Philco Ford Corp Air flow control apparatus
US3837268A (en) * 1972-11-09 1974-09-24 American Warming Ventilation Protective damper for gas exhaust duct
US3863392A (en) * 1974-03-21 1975-02-04 Leroy C Haker Sand blast room
US3894128A (en) * 1970-02-27 1975-07-08 Seitetsu Kagaku Co Ltd Tray for fluid contactor apparatus
US4628801A (en) * 1984-05-25 1986-12-16 Mitsubishi Denki Kabushiki Kaisha Wind direction changing device
US4823547A (en) * 1986-10-30 1989-04-25 Rolls-Royce Plc Thrust reverser
US4968869A (en) * 1989-04-25 1990-11-06 Copeland Steven R Automotive heating and defrosting apparatus
US5306210A (en) * 1991-08-15 1994-04-26 Smit Dirk V Z Louvre type roof structures
US5345966A (en) * 1993-12-23 1994-09-13 Carrier Corporation Powered damper having automatic static duct pressure relief
WO2006108228A1 (en) * 2005-04-15 2006-10-19 Minova International Limited Airflow regulator
WO2008059251A3 (en) * 2006-11-17 2008-08-07 Christopher Coxon Pressure relief vent maintaining fire rating integrity
AU2006235210B2 (en) * 2005-04-15 2008-08-21 Minova International Limited Airflow regulator
WO2009044267A1 (en) * 2007-10-03 2009-04-09 Minova International Ltd Improved airflow regulator
US9422715B1 (en) * 2012-05-01 2016-08-23 C. Scott Selzer Louvered roof apparatus and control system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423629A1 (en) * 1978-04-19 1979-11-16 Alsthom Cgee Ventilation grille for underground tunnel - has series of freely pivoted flexible flaps and overlying powered openwork flaps for two way ventilation
FR2702538A1 (en) * 1993-03-08 1994-09-16 Cnim Device for venting a pressurised vessel
DE102005011791A1 (en) 2005-03-11 2006-09-21 Eidmann, Jürgen Dampers device
DE102005053590B4 (en) * 2005-11-10 2008-11-13 Eidmann, Fritz Jürgen Smoke protection system and method for removing smoke from fire areas of a building and the smoke-free escape of escape routes of the building
CN101513877B (en) * 2008-02-20 2011-04-13 南车青岛四方机车车辆股份有限公司 Louver window for vehicle roof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1099689A (en) * 1912-10-09 1914-06-09 C H Wheeler Mfg Co Atmospheric relief-valve.
US1588445A (en) * 1925-05-14 1926-06-15 Aquila D Chandler Means for controlling the flow of mixture to internal-combustion engines
US3123098A (en) * 1964-03-03 Multiple louver damper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123098A (en) * 1964-03-03 Multiple louver damper
US1099689A (en) * 1912-10-09 1914-06-09 C H Wheeler Mfg Co Atmospheric relief-valve.
US1588445A (en) * 1925-05-14 1926-06-15 Aquila D Chandler Means for controlling the flow of mixture to internal-combustion engines

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604458A (en) * 1969-02-13 1971-09-14 Modine Mfg Co Temperature compensating damper structure
US3894128A (en) * 1970-02-27 1975-07-08 Seitetsu Kagaku Co Ltd Tray for fluid contactor apparatus
US3699873A (en) * 1971-06-14 1972-10-24 Philco Ford Corp Air flow control apparatus
US3837268A (en) * 1972-11-09 1974-09-24 American Warming Ventilation Protective damper for gas exhaust duct
US3863392A (en) * 1974-03-21 1975-02-04 Leroy C Haker Sand blast room
US4628801A (en) * 1984-05-25 1986-12-16 Mitsubishi Denki Kabushiki Kaisha Wind direction changing device
US4823547A (en) * 1986-10-30 1989-04-25 Rolls-Royce Plc Thrust reverser
US4968869A (en) * 1989-04-25 1990-11-06 Copeland Steven R Automotive heating and defrosting apparatus
US5306210A (en) * 1991-08-15 1994-04-26 Smit Dirk V Z Louvre type roof structures
EP0660052A3 (en) * 1993-12-23 1997-06-11 Carrier Corp Powered damper having automatic static duct pressure relief.
US5345966A (en) * 1993-12-23 1994-09-13 Carrier Corporation Powered damper having automatic static duct pressure relief
WO2006108228A1 (en) * 2005-04-15 2006-10-19 Minova International Limited Airflow regulator
AU2006235210B2 (en) * 2005-04-15 2008-08-21 Minova International Limited Airflow regulator
US20080254733A1 (en) * 2005-04-15 2008-10-16 Verne Mutton Airflow Regulator
RU2439330C2 (en) * 2005-04-15 2012-01-10 Минова Интернэшнл Лимитед Air flow controller
WO2008059251A3 (en) * 2006-11-17 2008-08-07 Christopher Coxon Pressure relief vent maintaining fire rating integrity
WO2009044267A1 (en) * 2007-10-03 2009-04-09 Minova International Ltd Improved airflow regulator
US20100267324A1 (en) * 2007-10-03 2010-10-21 Verne Mutton Airflow regulator
AU2008306570B2 (en) * 2007-10-03 2012-11-08 Minova International Ltd Improved airflow regulator
CN101874183B (en) * 2007-10-03 2014-05-07 米诺桦国际有限公司 Improved airflow regulator
US9422715B1 (en) * 2012-05-01 2016-08-23 C. Scott Selzer Louvered roof apparatus and control system

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Publication number Publication date
FR1367911A (en) 1964-07-24
GB982974A (en) 1965-02-10
DE1454651A1 (en) 1969-03-13

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