US2022460A - Heating device regulator - Google Patents

Description

Nov. 26, 1935. L. F. DUTCHER HEATING DEVICE REGULATOR Filed March 6, 1955 2 Sheets-Sheet l NOV. 26, 1935. I. L, BUTCHER 2,022,460

HEATING DEVICE REGULATOR Filed March 6, 1955 2 Sheets-Sheet 2 Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE HEATING DEVICE REGULATOR Leland F. Dutcher, Providence, R. I.

Application March 6, 1935, Serial No. 9,678 24 Claims. (01. 2as 9s) The present invention relates to an improved regulator for heatingdeviccs and more particularly to means automatically operable for conserving and utilizing heat generated in a furnace, boiler, oil burner, or the like.

An important object of the invention is to provide the flue pipe or stack of a heating device with simple, eiiicient and economical means, operable in response to variations in temperature of the heated gases passing through the flue pipe, to prevent the withdrawal of the heated gases from the heating. device before the gases have had suflicient time to transfer their heat to the heating device, thus insuring the utilization of a substantial portion of the heated gases which would otherwise be dissipated.

A further object consists in associating with a heating device such as a water boiler, steam boiler or warm air furnace, a combined stack limit and damper control means movably positioned within-the stack and operableby variations in the heat of the gases passing through the stack, said means being operatively connected to an air or draft damper whereby when the heat of the gases in the stack exceeds a predetermined temperature, to automatically actuate the control means so as to move the latter to retard the flow of the heated gases through the pipe and simultaneously close the air controlled damper. Conversely when the temperature of the gases in the stack falls below a predetermined temperature, the control means is moved to permit the uninterrupted flow of the heated gases through the pipe and simultaneously operate the air controlled damper. In other words, I provide means for controlling draft by the temperature of the flue gases instead of by the temperature of the water in a water boiler, the pressure of steam in a steam boiler, or by the temperature of the air discharged by a warm air furnace. It has been found that the latter class of devices are open to the serious objection that they not infrequently permit considerable waste of fuel due to the fact that they permit the draft to be opened too long while waiting for steam to form or water or air to become heated.

In contrast to the deficiencies in heating device regulators as heretofore made, I provide means which will automatically retard the flow of the heated gasesthrough the stack or flue pipe so that a substantial portion of the hot gases of "combustionin the boiler or furnace will be reture of the hot gases in the stackhas cooled,

means are provided for automatically openingthe air draft to,.al1ow the fire to pick up again. Thus, it is apparent that by reason of my invention, a nearly constant stack temperature can be maintained while waiting for the operation of the air or draft regulator associated with the 5 heating device, to'close the draft and check the fire.

Other objects and advantages of the invention will become apparent, from the following description when taken in conjunction with the ac- 1o companying claims and drawings.

Referring to the drawings, in which are shown several preferred embodiments, the invention may assume,

Figure 1 is a plan view of a flue pipe or stack 15 having my invention associated therewith,

Figure 2 is a sectional view taken substantially along the line 2-2 of Figure 1, showing the damper plate closed in dotted lines,

Figure 3 is a sectional view taken substan- 20 tially along the line 3-3 of Figure 2,

Figure 4 is a detailed end view of one end of i the operating shaft,

ified form of regulator which may be associated 'with the burner shown in Figure 8.

Referring to the drawings, 9 indicates generally my improved regulator which is arranged to be associated with a flue pipe or stack l0 through which the heated gases from a heating device are discharged. In order to conveniently and effectively connect the regulator 9 to the pipe Ill, the latter is preferablyprovided with an elongated opening Il (Figure 2) in its side, to which may be connected a rectangular supporting frame I! .by the bolts I3. A damper plate ll positioned within the pipe l0, may be pivotally connected at one end to the frame I2 by a shaft H which in turn is non-rotatably secured to the plate ll; One end of the shaft l5 extends be yond'theside of. the frame I! and the pipe In as at l6. Within the pipe or stack I0 is a thermostat, preferably in the form of a spirally wound bi-metal unit H, the inner or central end of which has the horizontal portion l8 connected to the lower end of a curved arm or bracket i9 by a bolt 20 and a nut 2i (Figure 3). The opposite end of the arm i9 is secured to the inner wall of the flange I2 by the bolt 22 and nut 23.

, The outer end of the thermostat i1 terminates in a straight portion 24 which preferably is swivelly connected to a rod 25 as at 28. The outer or upper end of the rod-25 is secured to the plate I4 in any suitable manner such as by the rivet 28. The damper plate l4 normally assumes the position shown in dotted lines in Figure 2 and is moved to its full line position upon the expansion of the thermostat in response to increase in temperature of the flue gases. It will be observed that the thermostat I1 is positioned in the pipe so that the damper plate I4 acts as a shield to prevent direct contact of the air passing through the opening I l with the thermostat. While the frame i2 isshown as a separate element, it is manifest that the same may be made as an integral part of the pipe when the opening I i is being formed therein.

The convolutions of the spiral thermostat H degrees as clearly shown in Figure 3 so as to insure all parts of the thermostat being uniformly and directly exposed to or in the path of the heated gases passing through the flue pipe Hi. The rod 25 preferably is inclined so as not to extend perpendicularly from the damper plate 14 and thus is connected to the thermostat to facilitate the movement of the plate l4 in response to the actuation of the thermostat. A stop in the form of a lug 21 beneath the shaft l acts to limit the downward movement of the plate l4 and prevents the latter from swinging through an arc of more than ninety degrees.

The extended portion I8 of the shaft has a member in the form of a wheel or pulley 28 nonrotatably secured thereto in any suitable manner, such as by the set screw 28 which extends through the hub 38 of the wheel to engage with the adjacent portion of the shaft l8 (Figure 3). The wheel 28 is preferably provided in its outer periphery with a groove 3| having a series of circumferentially disposed spaced openings 32.

The sides of the wheel 28 may also be provided with a series of openings or perforations 33 for adjustably receiving a tensioned or weighted member which will be subsequently described.

- The regulator 9 is arranged to be associated with various types of heating devices for retarding the flow of heated gases passing through the flue pipe or stack and is automatically operable in accordance with the variations in temperature of the flue gases, to either control the air introduced into the heating device when associated with warm air furnaces and steam boilers or for retaining and conserving the heat in oil burners so as to utilize the heat to its maximum degree. In Figure 6 the flue pipe or stack "I having my automatic regulator 8 associated therewith, is

shown connected to a warm air furnace 34 and a chimney 35. A tensioning member 38 in the form of a flexible chain 31 having an intermediate spring connection 38 may be adjustably connected at its lower end to the wheel 28 by the l hook 39 arranged to engage in one of the side openings 33. The opposite end of the chain 38 is provided with a hook 48 adjustably connected to a plate 4| through the vertical openings 42 formed in the plate. The plate 4| may be conveniently positioned in the cellar or in a room above the cellar so as to adjust the tension exerted by the spring 38 on the member 28. A flexible member, such as a chain or the like 43, is

connected at one end through a hook 44 to 5 one of the peripheral openings 32 in the member 28 and extends over the spaced guide pulleys 45 so as to be connected at its opposite end as at 48, to the ash pit damper 41.

The chain 38 is connected to the member 28 so 1 as normally to create a suflicient tension through the spring 38 to maintain the damper plate l4 in position against the flange 48 of the frame l2 (Figure 2) so as to close the opening Ii. It will be seen that by varying the connection of the chain 38 with the member 28, the movement of the damper plate l4 awayfrom the opening ll may be controlled so asto cause the damper to move either slowly or rapidly as required by the particular heating installation. Moreover, by reason of the adjustable connection of the upper end of the chain 38 with the plate l4, the pressure exerted on the member 28 to maintain the damper plate l4 in its closed position, may be conveniently adjusted from the cellar or a room above the same so that this tension may be varied as temperature conditions in the house or building may require.

Assuming that the parts are in the position as shown in Figure 6 with the damper plate l4 closing the opening II, and the damper 48 opened to allow the'introduction of air into the furnace 34, it will be apparent that when the heat of the gases passing through the flue pipe in exceeds the temperature to which the thermostat is set, the thermostat is expanded, which in turn causes the damper plate l4 to be moved downwardly and inwardly into the path of the heated gases by reason of its connection through the rod 25 to the outer end 24 of the thermostat (Fig. 2), thus retarding the flow of the heated, gases. Simultaneously with the downward movement of the damper plate l4, the member 28 is rotated in a clockwise direction so as to close the damper 48. Conversely, when the temperature of the heated gases in the flue pipe l8 cools or falls below the predetermined temperature, the thermostat will contract, causing the damper plate to be moved to close the opening I i and the flexible member 43 will be actuated to open the air no;

controlled damper 48. In other words, by reason of my improved regulator and combined automatic stack limit, a draft control isprovided which, when the desired stack temperature is attained, will close the ash pit damper 48 to reduce 85- I thermostat 8| responsive to variations in temperature of the boiler 48 may be operatively connected with the lever arm 52 pivoted at 53 to a bracket 54 mountedon the boiler 48. To one end of the arm 82 is adjustably secured a weight while the opposite end of this arm is connected to a rod. The lower end of the rod 58 extends loosely through an opening in the damper plate 5'! so as to permit the independent movement of the damper plate relative to the rod 58. A collar 78 the path of the gases and to its closed position, upon the lowering of the temperature in the pipe.

In certain cities, there are ordinances goveming the installation of oil burners which require thefluedamperto beoi'ahingedtypesoasto open outwardly to relieve pressure caused by pufls or backfire due to delayed ignition. In Figure 9, there is shown a modifled form of the regulator disclosed in Figure 8 and which isarranged to be associated with oil burners to comply with these regulations. In Figure 9, the flue pipe 13, has positioned therein, a coiled thermostat 14 so as to be directly in the path of the flue gases. The inner or central end of the thermostat is connected as at I to a bracket 16 secured to the flange ll of the frame I8 by the bolt I! and the nut ll. The opposite end 8| of the thermostat is swivelly connected as at 82 to a rod or bar 83 which extends through an opening in the damper plate N and is provided with spaced adjustable collars or stops 85 and 86 between which the damper plate is freely movable. The plate 84 is pivotally connected at one end as at 81 to the frame It and has its opposite end arranged, when in its closed position, to engage the ridge I8 which limits its downward movement. Normally, the plate 84 and its associated parts are in the full line position as shown in Figure 9. Upon increase in the temperature of the flue gases, the

arm 4| to be moved upwardly, which in turn raises the damper plate 84 so that this plate assumes the position as shown in dotted lines. The plate 84 is i'reely'movable between the stops 85 and II so that when it is in its closed position, itmay be instantly opened by sudden or exces sive pressure caused by puffs or backfire in the j flue pipe. to permit the escape oi thse gases and thus relieve the thermostat II from being subiected to such a severe strain. Whenthe plate M is moved to its raised or opened position; the

cold air admitted to the pipe does not affect the operation of the thermostat due to the fact that it is not in'the direct path of the cold air current, The cold air passing into the pipe naturally follows the course of least resistance which is toward thechimney,duetothenatura1draftfromthe chimney. Consequently, the thermostat is not cooled by the external air but is direetly.respon- 'sivetothe temperatureoithefluegasesiromthe heating device;

The side openings in each of the wheels 28, I and -'II are arranged to adjustablzreceive a tensioning or weighting member so that the latter may be connectedto the wheel on its side to yieldably maintain the damper plate in its closed position and control its rapidity of movement away from its opening. Moreover, the tensioned orweightedmembermaybepositionedsoasto initiallyadjustthedamperplatetoanydegree thatmaybedesiredbyreasonoi'thepu'ticular installationtowhichtheregulatorisassociated' The tensioned or weighted members are connectedtothewheel orpulley atapointnormally 65 tomaintainthedamperplateoutoi thepathgf rthe flue'gases and to close the opening in the pipe. However, it is manifest that the positioning of the tensioned or weighted member may be adjustedsoastovary thepressureexertedbythismember on the damper plate as the particular heat installation may require.

It willbethatmyregulatorcanbe conveniently'connected to flue pipes of various types of heating devices without necessitating the 16 dismantling of the pipes and can beconvenientlv thermostat ll will be actuated to cause its outer of the appended claims.

I claim: v r v 1. In combination with a flue pipe having a side open s or a regulator including a damper plate positioned within the pipe and arranged to close said opening, means pivotally connecting 3 one end 01' the plate to the pipe to permit the 20 plate to be moved into the path of the heated gases passing through the pipe, and a coiled thermostat connected at one end to the pipe and connected at its opposite end-to the plate for actuating the latter in accordance with variations in temperature 01 the flue gases, said thermostat being positioned in the path of the flue I gases so that when the heat of the gases in the pipe exceeds a predetermined temperature, the thermostat automatically actuates the plate to 3.0 move the latter to retard the flow of the heated gases passing through the pipe and moves the plate out or the path of the gases upon the lowering of the temperature in the pipe.

2. In combination with a flue pipe. having a 36 side opening, 01' a regulator including a damper platepositioned within the pipe and arranged to close said opening, means pivotally connect- 'ing one end oithe: plate to the pipe to permit the plate to be moved downwardly to impede the 40 flow of the heated gases passing through the pipe, and a coiled thermostatconnected at one to the pipe and connected at its opposite end to the underside oi. the plate for actuating the latter in accordance with the variations in temperature of the flue gases. said thermostat being positioned in the path of the flue gases. whereby when the heat of the gases'in the pipe exceeds a. predetermined temperature. the thermostat automatically actuates the plate to move the latso ter downwardly to retard the flow oi the heated gases through the pipe and moves the Plate to close said opening upon the lowering oi the temperature in the pipe.

3. In combination-with a fllle P p having a. side-opening. oi a regulator including a damper plate positoned within the pipe and arranged to close said opening, means pivotally connecting oneendottheplatetothepipetopermitthe" plate to be moved downwardly to impede the 00 flow or the heated gases through the pipe, and a coiled thermostat connected at one end to the pipe and connected at its opposite end to. the underside of theplate i'or actuating-the ing from the spirit of the invention and the scope lattenin accordance with variations in temperature of the flue gases, the convolutions oi the t beinginclinedatanangleto the; rerticalaxis'oi'thepipetoexposethesame-unii'ormlyanddirectlytotheheatoithefluegases,

whereby when-the heat of the gases in the plpe exceeds a predetermined temperature, the thermostatautomatically actuates the plate to move the latter downwardly to retard the, flow oilthe heated gases and moves the plate out of the u path of the gases upon the lowering oi the temperature in the pipe. i

4. In combination with a flue pipe having a side opening. of a regulator including a damper plate positioned within the flue pipe and arranged to close said opening, means pivotallyconnecting one end of the plate to the pipe to automatically actuating the plate to move the latter to retard the flow oi the heated gases passing through the pipe and for moving the plate out of the path'oi the gases upon the lowering of the temperature in the pipe, and means for normally maintaining the damper plate out of the path of the flue gases.

5. In combinationwith a flue pipe having a side opening, of a regulator including a damper plate positioned within the flue pipe and arranged to close said opening, means pivotally connecting one end of the plate to the pipe to permit the plate to bemoved into the path of the heated gases passing through the pipe, a

coiled thermostat connected at one end to the pipe and connected at its opposite end to the plate for actuating the latter in accordance with variations in temperature of the flue gases, said I thermostat being positioned in the path 01 the flue gases, whereby when heat of the gases in the pipe exceeds a predetermined temperature for automatically actuating the plate to move the latter to retard the flow of the heated gases passing through the pipe and for moving theplate out of thepath of the gases upon the lowering of the temperature in the pipe, and adjustable means operatively connected to the damper plate for normally maintaining the latter in a position to close said openin said adjustable means arranged to control/the rapidity of movement of thedamper plate away from said opening.

it In combination with. a flue pipe having a side opening, of a regulator including a damper plate positioned within the pipe and arranged to close said ,opening, means pivotally' connect- ,ing the damper plate to the pipe comprising a shaft connected tocne end of the plate and journalled in opposed sides of the pipe-,one end of said shaft extendingbeyond the pipe and having a member non-.rotatably securedthereto, and means adjustably connected to said member for normally urging the damper plate to aposition to close said opening and for controlling the rapidity of movement of the damperplate away from the opening.

7. In combination with a flue pipe having a side opening, of a regulator including a damper plate positioned withinthe pipe and arranged to close said opening, means pivotally connect- :ing the damper plate to the pipe comprising a shaft connected to the upper end of the plate' and journalled in opposed sides of the pipe, one

end or said shaft extending beyond the pipe and having a member non-rotatably secured thereto,

means adjustably connected to said member for yieldably maintaining the plate in a position to close saidopening and for controlling the plate positioned within the pipe and arranged to close said opening; means pivotally connecting the damper plate to the pipe comprising a shaft connected to one end of the plate and journalled in opposed sides of the pipe, one end of said shaft extending beyond the pipe and having a mem-, bernon-rotatably secured thereto, a coiled thermostat, means connecting one end of the thermostat to said pipe, means connecting the opposite end of the thermostat to the underside of the damper plate and out of direct contact with the air passing through said opening, said thermostat arranged to actuate said damper plate in response to variations in, temperature of the flue gases, and means adjustably connected to said member for normally. urging the damper plate to a position to close said opening and for controlling the rapidity of movement of the damper plate away from the' opening.

duction of air into the'heating device in response to the movement of the damper plate upon variations in the temperature of the heated gases in. the flue pipe. I

10. In combination with'a heating device'having a flue pipe provided with-a side opening, of 740 a regulator including a'damper plate positioned within the pipe and arranged to close said opening; meansfor pivotally connecting the damper plate to the pipe comprising a shaft connected to one end of the damper plate and journaled to 5 Y the sides of the pipe, a coiled thermostat connected at one end to the pipe and connected at its opposite end to the underside of the plate, said heating device having an air control damper, and means connecting the air control damper to said shaft whereby to actuate simultaneously the-control damper and damper plate in accordance with the variations in temperature of the heated gases in the flue pipe.

11. In combination with a heating device hav- 5:; ing a flue pipe provided with a side opening, and arranged to close said opening, means for pivotally connecting the damper plate to the pipe comprising a shaft. connected to one end of the damper plateand pipe, a coiled thermostat connected at one end to the'pipe and connected'at its opposite end to the und'ersideof the plate, said heatingdevice having i an air control damper, the convolutions oi the iv to the heat oi-the gases passing through the flue pipe, and means connecting the air control damper to'said Shaft whereby to actuate simultaneously thecontrol damper and/damper plate in accordance with variations in temperature of the heated gases in theflue pipe. i 12. In combination with a heating device having a flue pipe provided with a side opening, oi-a regulator including a damper plate positioned journaled in the sides of the go s. means for and having a member within the pipe and arranged to close said opening, means for pivotally connecting the-damperplate to the pipe comprising a shaft connected to one end of the damper plate and Journalled in opposite sides of the pipe, a coiled thermostat connected at one end to the pipe and connected at its Opposite end to the underside of the plate, one end of said shaft extending beyond the pipe and having amember keyed thereto, means adj-ustably connected to said member for normally maintaining the plate in a position to close said opening, said heating device having an air controlled damper, and means connecting the air controlled-damper to said member whereby to automatically control the introduction of air into the heating device in response to the movement of the damper plate upon variations in perature of the heated gases in the flue pipe.

13,111 combination with a heating device having a flue pipe provided with a side opening, of a regulator including a damper plate positioned within the pipe and arranged to close said opening, means for pivotally connecting the damper plate to the pipe comprising a shaft connected to one end of the damper plate and journalled in opposite sides of the pipe, a coiled thermostat connected at one end to the pipe and connected at its opposite end to the underside of the plate, one end of said shaft extending beyond the pipe and having a member keyed thereto, means adiustablyconnectedto said member for normally maintaining-the plate in a position to close said opening, said heating device having an air controlled damper, and means operatively connectthe teming said member t6 said air controlled damper whereby when the heat of the gases in the pipe exceeds a predetermined temperature for automatically actuating the plate. to move the latter downwardly to retard the flow of the heated gases through the pipe and simultaneously to close the air controlled damper to prevent the withdrawal of the heated gases from the heating device before thegases have had suflicient time to transfer their heat tothe heating device.

15!. In combination with a heating device havlng-"a flue pipe provided with a side opening, of a regulator including a damper plate positioned within the pipe and arranged to close said openpivotally connecting the. damper plate to the. pipe comprising a shaft connected to one end ofthe damper plate and iournailed in .opposite sides of the pipe, a coiled connectedatoneendtothepipe and connected at its opposite end to the underside of the plate, oneend of said shaft extending beyond the pipe keyed thereto, means adiustably connected to said member for normally maintaining the plate in a position to close said opening, said heating device having an air con? trolled'damper, and means operatively connecting said member to said air controlled damper whereby when the heat of the gases in the pipe exceeds a predetermined temperature for automatically actuating the plate to move the latter downwardly to retard the flow of the heated through the pipe and simultaneously to close the air controlled damper to prevent the withdrawal of the heated from the heating device be-- fore the gases have had sufllcient time to transfer their heat tothe heating device, said means also actingto return the damper plate'to its closed position and simultaneously openthe air controlled damper upon the lowering of the temperatureof the'gas in thefluepipe.

15.'In combination with a heating device have variations in temperature of the 'fli e heated gases passing through the flue pipe whereby when the heat of the gases in the pipe exceeds a predetermined temperature for automati- 1d cally actuating the plate ,to move the latter downwardly to retard the flow of the heated gases through the pipe and for returning the damper plate to its closed position upon the lowering of.

the temperature in the pipe, one end of said shaft :0

extending beyond the pipe and having a member keyed thereto, means adiustably connected to said member for normally maintaining the plate in a position to close said opening, said heating device, having an air controlled damper; and 25 means connecting the air control damper to said member to automatically operate the same in response to variations in temperatures! the gases passing through the flue pipe. I

16. In combination with a flue pipe having a 8,0

side opening, of a regulator including a-plate arranged to control said opening, means pivotally connecting one end 'of the plate to the pipe, a

coiled thermostat connected at one end to the pipe and connected at its opposite end to the plate {iifor actuating the latter to control said opening in accordance with variations in the temperature of the flue gases, said thermostat being positioned in the path of the flue gases and having its,con-

volutions inclined at an angle to the vertical axis so of the pipe to expose the convolutions uniformly to the heat of the flue gases, and means for per-- mitting the independent movement of the plate relative to the thermostat whereby when the plate isinitsclosedpositionitmaybeopenedbythe excessive pressure of "the gases in the flue'pipe. 17. In combination with a heating device having a flue pipe provided .with a side opening, of a regulator including a movable damper plate' arranged to control said opening and be moved l0 -inwardlyintothepathoftheheatedgasespass-' ing through the pipe to retardthe flow of the same, a coiled thermostat supported within the v pipe between the heating device and said opening,

said thermostat having 'a portion thereof oper- I} atively associated with said plate for actuating the latter in accordance with variations in temperature of the flue gases.

18. In combination with a heating device having a flue pipe provided with a side opening, of so a regulator including a movableplate arranged to control said opening. and a coiled thermostat positioned within the pipe between the heating device and said opening, the inner end of the thermostat being supported outer end portion of the thermostat being operatively associated with said plate for actuating the latter'to control said opening in accordance with said 7 thermostat having ing a flue pipeprovided with aside opening, of 7 10 position to close said opening, said thermostat being uniformly exposed at all times to the by'said pipe and the as its convolutions inclined at an 1. angletothevertical axisofthe pipe toexposethe convolutions uniformly a regulator including a movable damper plate arranged to control said opening and be moved into the path of the heated gases passing through the pipe, a coiled thermostat positioned within the pipe between the heating device and said opening, means connected to the inner end of the thermostat for supporting the same within the pipe, said thermostat having its outer end portion operatively associated with said plate, so that when the heat of the gases in the pipe exceeds a predetermined temperature, the thermostat permits the plate to be moved inwardly to retard the flow of the heated gases passing through the pipe and moves the plate out of the path of the gases upon the lowering of the temperature in the pipe.

20. In combination with a heating device having a flue pipe provided with a side opening, of a regulator including a movable plate arranged to control said opening, a coiled thermostat supported within the pipe between the heating device and said openings, said thermostat having a.

portion thereof operatively connected to said plate for actuating the latter to control said opening in accordance with variations in temperature of the flue gases, and means for permitting the independent'movement of the plate relative to the thermostat.

21. In combination with a heating device having a flue pipe provided with a side opening, of a regulator including a movable plate arranged to control said opening, a coiled thermostat supported within the pipe between the heating device and said opening, a member extending through an opening in said p'ate and provided with spaced stops between which the plate is independently movable, and means connecting an arm of the thermostat to said member for actuating the plate in accordance with variations in temperature of the flue gases.

22. In combination with a heating device having a flue piperprovided with a side opening, of

a regulator including a pivotally mounted plate arranged to control said'opening and movable outwardly relatively thereto, a coil thermostat supported within the pipe between the heating. device and said opening, a member extending through an opening in said plate and provided 5 with spaced stops between which the plate is independently movable, and means connecting the outer arm of the thermostat to said member for actuating the plate in accordance with variations in temperature of the flue gases.

23. As an improved article of manufacture, a regulator arranged to be mounted .on a flue pipe, said regulator including a frame member having an opening, a plate pivotally connected to the frame member for controlling said opening, a 15 coiled thermostat suspended from the frame member and arranged to be positioned between a heating device and said opening, and means fixedly connecting the inner end of thethermostat to said frame member, said thermostat hav- 2o ing its outer convolution arranged to be operatively associated with the plate. for actuating thelatter to control said opening in accordance with variations in temperature of the flue gases.

24. As an improved article of manufacture, a 25 regulator arranged to be mounted on a flue, pipe, said regulator including, a frame member having an opening, a plate pivotally connected to the frame member for controlling said opening, and

movable outwardly relative thereto, a coiled ther- 30- mostat suspended from the frame member and arranged to be positioned between a heating device and said opening, means fixedly connecting the inner end of the thermostat to said frame member, said thermostat having its 'outer con- 35 volution arranged .to be operatively associated with the plate for actuating the latter to control said opening in accordance with variations in temperature 01 he flue gases, and means for permitting independent movement of the plate rela- 40 tive to the thermostat.

LELAND F. puronna;

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