US2040231A - Combustion controlling device for furnaces - Google Patents

Description

ay 12, 1936. B G. WOOLLEY 2,040,231

COMBUSTION CONTROLLING DEVICE FOR FURNACES Filed Jan. 12, 1934 3 Sheets-Sheet 1 12, 1936. B. G WOOLLEY 2,040,231

COMBUSTION CONTROLLING DEVICE FOR FURNACES Filed Jan. 12, 1934 3 Sheets*Sheet 2 ay 12, 1936. B, G. WOOLLEY COMBUSTION CONTROL ING DEVICE FOR FURNACES Filed Jan.

12, 1934 3 Sheets-Sheet 3 f w 1 i k Patented May 12, 1936 PATENT OFFICE COMBUSTION CONTROLLING DEVICE FOR FURNACES Bradford G. Woolley, Providence, R. 1., assignor to Hammel Oil Burning Equipment Company, Inc., Providence, R. I., a corporation of Rhode Island Application January 12, 1934, Serial No. 706,382

17 Claims.

eration and freedom from dangerous conditions liable to result from overloading.

Another object of the invention is to provide a device of the type indicated which is adjustable to meet varying requirements when used in conjunction with furnaces of different types and capacities.

Another object of the invention is to provide a device of the type indicated which may be operated directly from the draft-controlling means of the furnace to insure proper codperation therewith.

Another object of the invention is to provide a device of the type indicated which is embodied in a single unit adapted for application to furnaces already in use without material change in their structure.

Another object of the invention is to provide a device of the type indicated which is of simple and rugged construction to adapt it for use over long periods of time without repair or replacement.

Further objects of the improvement are set forth in the following specification which describes a preferred form of construction of the invention, by way of example, as illustrated by the accompanying drawings. In the drawings:

Fig. l is a front elevation of a steam boiler furnace of industrial type showing the improved control device as applied to use therewith and connected to be operated from the draft-regulating means;

Fig. 2 is a side elevation of the same;

Fig. .3 is an enlarged front view of the control device showing the relationship of the parts when adjusted to reduce the feed of oil and steam to a minimum;

Fig. 4 is a sectional plan view of the control device taken on line 44 of Fig. 3;

Fig. 5 is a side view of the control device showing the feed-valves adjusted to substantially closed position;

Fig. 6 is a similar view showing the valves in full open position to efiect maximum flow of oil and steam to the burner;

Fig. 7 is a combination end and sectional View of the steam-valve taken on line of Fig. 3 with the valve-plug shown in substantially closed position;

Fig. 8 is a combination end and sectional view through the oil-valve taken on line 8-8 of Fig. 3 and showing the valve-plug in substantially closed position;

Fig. 9 is a View similar to Fig. '7 showing the steam-valve opened to effect maximum flow of steam to the burner;

Fig. 10 is a view similar to Fig. 8 illustrating the oil-valve fully opened to permit maximum flow of oil to the burner; and

Fig. 11 is a perspective view of the valve-plug used in the oil-valve.

The present improved control device comprises, in general, a plate or panel adapted to be secured to the front of the furnace or boiler and provided with a pair of valves, one for controlling the supply of oil to the burner and the other for regulating the feed of steam or air thereto for atomizing the fuel. The valve-panel is generally located at a point remote from the burner with feed-pipes leading from the control-valves. Means are provided for operating the valves in synchronism to regulate the supply of fuel and. steam in correct proportion to obtain proper burning of the fuel in the furnace. In this manner combustion may be positively controlled and accurately regulated to meet the various firing conditions and steam demands. vInthe following description the term steam is used in a generic sense as indicating any suitable atomizing agent whether of a liquid or gaseous nature.

Referring first to Figs. 1 and. 2 of the drawings, the steam boiler herein illustrated is of a conventional industrial type enclosed by masonry 2 and a front plate 3. The front plate 3 is provided with the usual fire-box and ash-pit doors designated 4 and 5, respectively. The ash-pit doors 5 are pivotally mounted on hinge-rods 6 to adapt them to be swung into open or closed position to control the primary draft to the furnace. Extending horizontally at the front of the boiler is a control-shaft 8 journaled in bearings 9 on the plate 3. The shaft 8 carries levers I0 connected to the ash-pit doors or dampers 5 by chains 1 I, one end of each chain being attached to a lever l0 and its opposite end connected to an arm I2 extending laterally from the door 5. The control-shaft 8 may be manually turned by means of a handle I5 fixed to one end thereof or automatically operated from a suitable motor. The handle I5 is provided with a stud l6 passing through an arcuate slot I? in a quadrant I8, see Fig. 2, fastened to the side of one of the bearings 9. A hand-nut IS on the stud I! may be tightened against the quadrant I8 to retain the handle E5 in adjusted position.

At the top of the boiler is a flue 28 in which is rotatably mounted a shaft 2| carrying a butterfly valve or damper 22 adapted to be operated from the control-handle l5. At one end of the damper-shaft 2| is a semi-circular member 23 to which is attached a chain 24 connected at its opposite end to an arm 25 fast on the controlshaft 8. The damper 22 is controlled by meansof a spring or Weight of usual type to cause it to open when the handle i5 is swung upwardly from the position illustrated in Fig. 2. In addition to operating the dampers in the manner as above explained the handle l5 may also serve to operate the feed-control device for the burner by means as later described.

The boiler may be provided with any suitable type of oil-burner nozzle, indicated at 21 in Fig. 1 as projecting into the fire-box of the furnace. Connected to the outer end of the nozzle 21 are two feed lines 28 and 29 leading from the control device, the pipe 28 being for oil and pipe 29 for steam or air. A double indicator 38 at the front of the boiler is connected by tubes 3| and. 32 to the oil and steam feed- pipes 28 and 29 to register the pressure in each. The control device for regulating the supply of oil and steam to the burner is constructed and arranged as next described.

Secured to the front plate 3 of the boiler by means of bolts 34 is a small plate or panel 33. The bolts 34 pass through the corners of the panel 33 and through tubes 35 which space the panel outwardly from the front plate 3 to insulate it from heat and also to provide room for the oil and steam supply-pipes 36 and 31 which are connected to the rear of the panel. As shown in Figs. 4 and 5 the panel 33 is provided with circular bosses 38 and 39 having threaded bores extending through the panel. Screwed into the rearward ends of the bosses 38 and 39 are the supply-pipes 38 and 31 for oil and steam; the oil feed line 38 leading from a suitable source of sup-ply and the steam pipe 31 from the boiler. Shut-off valves l3 and M are provided in the lines 36 and 31 for manually shutting off the feed. Connected to the forward ends of the bosses 38 and 39 by nipples 4! are oil and steam control-valves 48 and 58. As both valves are similar in construction only one will be herein described in detail.

Referring to Fig. 4, the valve 48 comprises a body 42 in the shape of a. cross having two branches disposed in right angular relationship. Communicating with the supply-pipe 36 through the nipple 4| is an inlet passage 43 and opposite thereto is an outflow passage leading to the feed-pipe 28 which connects with the burnernozzle 21. The flow of the oil through the passage 43 is regulated by a valve-stem 44 extending transversely thereof.

The valve-stem 44, shown in detail in Fig. 11, comprises a cylindrical body-portion with a reduced shank 46 projecting axially therefrom. Extending diametrically through the body-portion of the, stem 44 is a port 41 of substantially triangular shape in cross-section, see Fig. 10, adapted to register with the inlet 43 when the stem is turned in the valve-body 42. As shown in Fig. 4, the shank portion of the valve-stem 44 is fitted to a bore 48 in the valve-body 42 and its enlarged portion seats in a counterbore 49 extending from the opposite side thereof.

The inner end of the counterbore 43 is tapered slightly to form a seat 5! for receiving the enlarged portion of the valve-stem 44 which is correspondingly tapered as shown at 52. Screwed into an enlarged threaded counterbore 55 in the end of the valve-casing 42 is a plug 53. Pocketed in an axial hole 5? in the plug is a spring 58 which bears against the end of the enlarged portion of the valve-stem 44 to maintain its opposite tapered end 52 firmly seated in the tapered end 5| of the counterbore 49 to form a seal for preventing leakage. As a further prevention against leakage around the valve-stem a stufiing box is provided. The valve-body is formed with a projecting gland 59 enclosing a suitable packing 88 compressed in the gland by a sleeve 6| held by an adjusting nut 62 screwed onto the threaded end of the gland.

Referring now to Figs. 3 and 7 to inclusive, the triangular openings or ports 41 in the steam and oil valve-stems are oppositely disposed. That is to say, the apexes of the triangular holes point in opposite directions so that When the valvestems are turned in opposite directions the two valves 48 and 58 are concurrently opened or concurrently closed. The means for turning the valve-stems to open and close the valves are constructed and arranged as next described.

Extending lengthwise of the panel 33 at rightangles to the valve-stems 44 is a projecting rib or pad 85 provided with a substantially T-shaped slot or guideway 63. Slidably mounted in the guideway 68 is a bar 61 connected to operate the valves 48 and 58 either from the control-shaft 8 or a handwheel 88 to be later described. Communicating with the guideway 66 is a narrower slot 88 for receiving a gear-rack l8 fastened to the rearward side of the bar 51 by means of screws H, see Figs. 4 and 6.

As shown in Fig. 6 a pinion i2 meshes with the gear-rack 18 and by turning the pinion the rack and its attached slide-bar 3! may be moved longitudinally of the panel 33. The pinion I2 is carried on or formed integral with a shaft or spindle l3 rotatably mounted in a bore 14 in the panel 33 which extends at right-angles to the guideway 86 at the rear thereof. The pinion 12 is slightly larger in diameter than the spindle l3 and a bushing iii in the bore i4 engages its inner end to retain the spindle in place in the bore. fhe bushing 75 constitutes a bearing for the spindle 13, being held in place in the bore 14 by means of a set-screw 16. A collar 'i'i secured to the spindle 13 by a set-screw E8 abuts the side of the panel 33 to take the thrust of the spindle T3 in the opposite direction. Secured to the projecting end of the shaft 13 is a handwheel 88, previously referred to, which serves as the means for rotating the pinion 72 to slide the bar Bl in its guideway 85. The handwheel 88 is employed for manually adjusting the feed-valves independently of the draft-regulating handle l5, previously described. When the control-handle I5 is manipulated to regulate the draft in the furnace the bar 6? is simultaneously actuated to open or close the Valves 48 and 58. Connected to the upper end of the bar 5'! is a link 8|, see Figs. 1 and 2, which is pivotally joined to a lever 83 on the control-shaft 8.

' bore.

Detachably secured to the slide-bar 61 are two valve- operating cams 84 and 85. Referring to Figs. 3, 5 and 6, the cams 84 and 85 are constituted by relatively thin bars or bendable strips shaped to extend at predetermined angles in relation to the bar 61. At their outer ends the cam- strips 84 and 85 are slotted to receive studs or screws 86 inserted through the ends of the slide-bar 61. As herein shown the heads of the screws 86 fit within countersunk holes in the rearward side of the bar 61 with the threaded ends of the screws projecting forwardly to receive nuts 81 screwed against the bar. The slotted ends of the cam- strips 84 and 85 are detachably fastened against the nuts 81 by means of bindernuts 88 screwed down thereagainst. The opposite overlapping ends of the cam- strips 84 and 85 are secured to a longer stud 89 projecting forwardly from the slide-bar 61 to extend through their slots. The stud 89 is screwed into a threaded hole in the slide-bar 61 and on its outer threaded end are nuts 90, 9| and 92, between which the ends of the cam-strips 84 and B5 are clamped. It will be observed by reference to Figs. 5 and 6 that the inner ends of the cams 84 and 85 are disposed at different distances from the slide-bar 81; the steam-valve control cam 85 being of slightly greater inclination or pitch than the cam 84 which controls the opening and closing of the oil-valve 40.

Secured to the outer extremities of the valvestems 44 are arms or levers 95 and 96. The arms 95 and 96 have split hubs 91 clamped to the stems 44 by binder-screws 98. Each arm 95 or 96 is formed at its end with a yoke 99 between the sides of which is a roller I journaled on a pin MI. The rollers I00 are adapted to ride up and down the incline of the cams 84 and 85 to turn the valve-stems when the slide-bar 61 is moved in either direction.

The arms or levers 95 and 96 are maintained with their rollers I00 in engagement with the cams 84 and 85 under the action of spring-controlled plunger-rods I05. Referring to Fig. 4 of the drawings the plunger-rods I slide through holes I06 in the panel 33, being provided with helical springs I I6 enclosing their projecting ends and held under compression by washers H5 and nuts H1. The rods I05 are connected to the arms or levers 95 and 96 by articulated joints embodied in heads I01 at the ends-of the rods. One side of each head I01 is slotted to receive the spherical end III] of a stud I09 screwed into the side of the arm 95 or 96, as the case may be. The spherical head IIO of the stud fits within a bore I08 in the head or socketed end I01 of the rod I05. A plunger III formed with a concaved recess is slidably held within the bore I08 and pressed against the head IIO of the stud I09 by means of a helical spring H2 pocketed in the The bore I08 is threaded to receive a plug II3 screwed thereinto to take the thrust of the head IIO under the pressure of the springplunger III.

Through the above described ball-and-socket joints the plunger-rods I05 are connected to the arms or levers 95 and 96 to maintain their rollers I00 continuously in engagement with the cams 84 and 85. The upward sliding movement of the bar 81 causes the arm 95 to be turned in clockwise direction by the cam 84 and the arm 96 to be rocked in the opposite direction by the cam 85; while movement of the bar in the opposite direction effects a reverse rocking motion of each of the arms. The arrangement of the .while, the steam-valve 50 opened by the same movement of the bar 61 control device having now been described in detail its method of operation will next be explained.

Assuming that the feed-controlling or regulating device is connected to be operated from the control-shaft 8 and that the control-handle I5 is in lowermost position as shown in Figs. 1 and 2, the valve-stems 44 of the feed-valves will be in a substantially closed position. That is to say, with the slide-bar 61 in lowermost position as illustrated in Fig. 5 the valve-arm 96 will be held depressed under the action of its plungerrod I05 while the arm 95 is rocked outwardly away from the panel 33. To start combustion in the fire-box of the boiler the valves I3 and I4 in the oil and steam supply-lines 36 and 31 are first opened to cause the oil and steam to be supplied under pressure to the control device. Referring to Figs. '1 and 8 of the drawings, it is noted that the oil and steam feed- valves 40 and 50 are never entirely closed, the arms 95 and 96 being so adjusted on the valve-stems 44 that there is a slight orifice through the triangular ports 41 into the outlet passage of the valves. For this reason a small amount of oil and steam will be supplied to the burner-nozzle 21 by way of the feed- pipes 28 and 29 to be ignited in the usual manner. To increase the feed of fuel and steam to the burner the binder-stud I6 on the controlhandle I5 is loosened and the handle swung upwardly from the position shown in Fig. 2. As the handle I5 is raised the control-shaft 8 is rotated in a clockwise direction, as viewed in Fig. 2, and through the chain connections II the lower dampers or ash-pit doors 5 are opened. Concurrently with the opening of the doors 5 the flue-damper 22 is released to be opened by means of its spring or weight, not herein shown.

During the turning of the shaft 8 the arm 83 is raised and through means of the link 8| the bar 61 is slid upwardly in its guideway 66 on the panel 33. As the bar 61 and its attached valvecontrolling cams 84 and 85 are operated in this manner the feed- valves 40 and 50 are opened by turning their stems 44 in opposite directions as previously explained. Referring to Figs. 5 and 6, as the bar 61 is elevated the roller I00 on the arm 95 rides down the incline of the cam 84 under the action of its plunger-rod I05 and the valve-stem 44 is rotated in clockwise direction to cause its triangular port 41 to more completely register with the passage 43 in the valve-body 42 as shown in Fig. 10. The oil-valve 40 may thus be opened to its full extent to effect maximum feed of the oil to the burner 21. Meanis simultaneously and the action of the cam 85. As the cam 85 moves upwardly the roller I00 carried by the arm 96 rides up the incline of the cam. The arm 96 together with the valve-stem 44 of the valve 50 are thus rotated in counterclockwise direction tending to aline the triangular port 41 with the passage 43 in the valve casing 42 in the manner as illustrated in Fig. 9 to effect increased feed of the steam or air to the burner-nozzle 21. As the fuel-oil enters the burner-nozzle under pressure it is atomized by the steam or air and sprayed into the fire-box of the boiler where combustion takes place.

After sufiicient steam pressure has been generated in the boiler the supply of oil and steam may be reduced and the draft proportionately diminished. To accomplish this regulation the operator simply depresses the control-handle [5 to partly close the dampers 5 and 22 and simultaneously lower the slide-bar 61. As the bar 61 is slid downwardly, for example to lowest position as shown in Figs. 3 and 5, the cam 84 rocks the arm 95 to turn the valve-stem 44 in counterclockwise direction to partially close the port 41 of the oil-valve 40 as indicated in Fig. 8. Concurrently therewith the arm 96 will be rocked to turn the valvestem 44 in the steam-valve 50 in clockwise direction to partially close its port 4? as shown in Fig. '7. It will be understood that the valves it and 5E! and the dampers 5 and 22 may be accurately adjusted to a mean operating position as determined by the steam pressure necessary to supply the demand. This is accomplished by turning the handle I5 to different positions between the extremes of movement above described.

It has been explained that in the present embodiment of the invention the pitch or angle of inclination of the steam-controlling cam 85 is greater than that of the oil-regulating cam 84. This provides that the steam-valve 50 will be 25 opened and closed more quickly than the oilvice.

valve 45. This condition is desirable in the operation of certain types of steam boilers and for meeting their particular requirements. The proportionate rates of movement of the valve-stems '44, may, however, be varied to meet other requirements when the control device is applied to use with steam boilers of different capacities, such adjustment being made when installing the de- Cam-strips 84 and 85 of various shapes may be supplied and assembled on the bar 61 as needed or, in other instances, the strips may be bent to the required contour to effect the desired inclination before application of the device to the boiler.

The control unit may be arranged to be operated automatically by a suitable motor, either electric or hydraulic, controlled by the developed steam-pressure to regulate the dampers and feedvalves to maintain a predetermined pressure in the boiler.

The present improved device is adaptable for general use in controlling combustion in furnaces supplied with liquid fuel and atomized by means of steam or air. In other instances it may be applied to use for adjusting a single feed-valve by dispensing with one of the cams. It may also be used in conjunction with feed-valves employed for other purposes in various arts.

The device is positive in operation and when once adjusted to meet the predetermined conditions it requires practically no attention on the part of the operator. When the device is operated from the draft-controlling means the control-shaft 3 may extended along the front of a battery of boilers and the combustion in the several boilers simultaneously regulated from a single panel with feed-pipes leading to each of the burners.

The improved device synchronizes the control of the supply of oil and steam tothe burner or burners to accurately limit the feed of the fuel and steam or air to the minimum required for any load. The oil and steam valves are positively opened and closed by the interlocked cams, thus giving each valve its own degree of opening. The cams may be readily adjusted to compensate for Wear or change in operation conditions.

With the use of the present improved device the hazardous condition resulting from overloading is entirely eliminated since the rate of feed of the fuel to the burner is positively controlled at all times and it is impossible to increase the flow of the oil without simultaneously increasing the flow of the atomizing agent. The device thus makes for greater eificiency in operation and results in a. substantial saving of fuel by eliminating waste.

While I have herein shown and described the improved combustion-controlling device as embodied in a preferred form of construction and applied to use with a particular type of boiler, it is to be understood that various modifications may be made in the structure of the device and. its application to use without departing from the spirit or scope of the invention. Therefore, without limiting myself in this respect, I claim:

1. In combination with a furnace, a burner therefor, a conduit for feeding fuel to the burner, a valve in said conduit for controlling the feed, a second conduit for feeding air or steam to atomize the fuel supplied to the burner, a valve in said second conduit for controlling the lastname-d feed, cams for operating said valves in synchronism, and a slide having a straight line motion for actuating the cams in unison.

2. In combination with a furnace, a burner therefor, a conduit for feeding fuel to the burner, a valve in the conduit for controlling the feed, a second conduit for feeding air or steam to atomize the fuel supplied to the burner, a valve in the I second conduit for controlling the flow of the medium therein, cams for operating said valves in synchronism, a slide for actuating the cams in unison, dampers for controlling the draft in the furnace, means for operating said dampers, and

means connecting said damper-operating means and slide to move the latter to actuate the cams for the valves.

3. In a control device for furnaces, the combination of a pair of conduits, one for fuel and another for or steam, valves for regulating the flow of fluid through each conduit, a plurality of cams for operating the valves, means for actuating the cams to open and close the valves in unison, and means for independently adjusting the cams at one end to regulate the ratio of adjustment of the valves during their synchronous operation from the cams.

i. In a control device for furnaces, the combination of a pair of conduits, one for fuel and another for air or steam, valves for regulating the feed through each conduit, a panel, a slide slidable on the panel, cams mounted on said slide and engageable with the valves to actuate the latter in unison, and means to slide the slide on the panel.

5. In a control device for furnaces, the combination of a pair of conduits, one for fuel and another for air or steam, valves for regulating the feed through each conduit, a panel, a slide slidab-le on the panel, a rack on the slide, a pinion engaging the rack to slide the slide, means for turning the pinion, and cams on the slide engageable with the valves to actuate the latter during the movement of the slide.

6. In a control device for furnaces, the combination of a pair of valves, one for fuel and another for air or steam, a lever for controlling each valve, a slide, cams mounted on the slide and adjustable in angular relation thereto, means on the levers engaging the cams, rods attached to the levers, and springs acting on said rods to maintain the levers in engagement with the cams during the movement of the slide.

'7. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, actuators for the valves, a reciprocable slide adjacent the actuators, inclined cams on said slide engaged by the respective valve-actuators to open or close the valves upon movement of the slide, and means for adjusting the cams at one end to vary the inclination thereof throughout their length.

8. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, actuators for the valves, a reciprocable slide adjacent the actuators, flexible strips on said slide inclined with respect to its direction of movement and engaging the valve-actuators, and adjusting means at the end of the strips for varying the inclination of said strips.

9. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, actuators for the valves, a reciprocable slide adjacent the actuators, cams mounted on said slide in inclined position with respect to the direction of movement thereof, resilient means for holding the valve-actuators in engagement with the cams, and means at the end of the cams for adjusting the inclination thereof whereby said valves are variably actuated by movement of the slide to regulate the proportions of fuel and air supplied to the furnace.

10. In a control device. for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the conduits, actuators for the valves, and movable cams inclined in opposite directions and engaged by the respective valveactuators whereby the valves are operated in opposite directions to simultaneously open the conduits when the cams are moved in one direction and simultaneously close the conduits when the cams are moved in the opposite direction.

11. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the conduits, actuators for the valves, a slide adjacent the actuators, cams on the slide having oppositely inclined faces engaged by the actuators, and means for adjusting the inclination of the cams, said valves being actuated in opposite directions by movement of the slide to simultaneously open or close the conduits.

12. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the conduits, actuators for the valves, a slide adjacent the actuators, cams on said slide having faces inclined in opposite directions to a common peak, and means at one end of the cams for adjusting their inclination throughout their length, said cams engaging the respective valveactuators to simultaneously open or close the valves upon movement of the slide in opposite directions.

13. In a control device for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the conduits, actuators for the valves, a slide adjacent the actuators, oppositely inclined cams on said slide, and resilient means for holding the valve-actuators in engagement with the respective cams whereby the valves are operated in opposite directions to simultaneously open or close the conduits upon movement of the slide.

14. In a control for furnaces, the combination of separate conduits for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the conduits, levers for actuating the valves to open or close the conduits, a slide adjacent the levers, oppositely inclined cams on the slide, and resilient means for holding the levers in contact with the respective cams, said valves being operated in opposite directions upon movement of the slide in either direction by the engagement of the actuating levers with the cams.

15. In a control device for furnaces, a panel, separate conduits extending through the panel for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, actuators for said'valves adjacent said panel, a slide on said panel having cam faces for engaging the respective valve-actuators, and manually-operable means for reciprocating the slide on the panel to simultaneously actuate the valves.

16. In a control'device for furnaces, a panel, separate conduits extending through the panel for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, actuators for said valves adjacent said panel, a slide on said panel having cam faces for engaging the respective valve-actuators, a damper for the furnace, means for connecting the damper with the slide, and manuallyoperable means for reciprocating the'slide to s1- multaneously actuate the valves and the damper.

17. In a control device for furnaces, a panel, separate conduits extending through the panel for feeding fuel and an atomizing medium, a valve in each conduit for regulating the flow of the medium therein, said valves being operable in opposite directions to open or close the con-duits, actuators for said valves adjacent said panel, a slide on said panel, cams on said slide having oppositely inclined faces engaged by the respective valve-actuators, a damper for the furnace, means for connecting the damper with the slide, and manually-operable means for reciprocating the slide to simultaneously actuate the damper and the valves in opposite directions.

BRADFORD G. WOOLLEY.

Images