US2032048A - Range - Google Patents

Description

W. A. BUSIEK Feb 25, 1936.

RANGE Filed April 27, 1934 4 Sheets-Sheet 2 Feb. 25, 19%. W, A, BU IEK zmzms RANGE Filed April 27, 1954 4 Sheets-Sheet 3 a x a III Patented Feb. 25, 1936 PATENT OFFICE RANGE William A. Busiek, Belleville, Ill., assignor to Alphonse E. Fellner, Belleville, 111.

Application April 27, 1934, Serial N0. 722,666

3 Claims.

The object of my invention is to devise a combination gas and coal range of the small or bungalow type. In ranges of this type heretofore made the baking process could be accomplished in the 5 oven when gas was used as fuel, but could not be accomplished when coal alone was used as fuel. In other words in ranges of this type, the coal portion merely acted to heat the room in-which the range was placed and to heat the plates above the coal portion of the range. With the type of construction herein employed with few and simple parts that lend themselves readily to multiple production, not only can baking be accomplished by the use of coal, but the baking can be perfectly done on different grids or shelves in the oven simultaneously.

In the ranges of conventional structure the heat circulation in the oven is such that the baking operation can be successfully accomplished only in a definite predetermined position in the oven. At other positions in the oven, the temperature is too great and at other positions not sufficiently great to produce uniform baked portions. With the device herein described, the baking operation may be accomplished, on any of the grids or shelves, because the heat from the products of combustion is compelled to travel beneath and over each grid or shelf maintaining the same temperature above and beneath each grid.

In the conventional range there are complications which attend the adjustment of the range from coal burning to gas burning that cause many difliculties and prevent the successful operation by the ordinary housewife. She is required, in

order to change from coal to gas to move several levers or dampers, some of which are inconveniently positioned and if she falls in the proper positioning of any one of these controls, the circulation system for the products of combustion from the gas will be so distorted that the baking operation is impossible. Usually the fact that the controls have not been properly positioned is determined after the unsuccessful baking operation. By the structure herein described, there is but one control to change the range from coal burning to gas burning. This is a simple conveniently placed handle, near the top of the range. By rotation of this handle, all the controls are governed.

The circulation of the products of combustion from either the coal or gas fuel is such that when the products of combustion are finally conducted from the range they will be at a relatively low 55 temperature. In other words by means of the circulatory system of the products of combustion the stack temperatures are so reduced that the maximum amount of heat from the products of combustion is extracted during the flow of the products of combustion through the range and may, therefore, be used and is used for the heating operation, for cooking and baking. This economy in heat is reflected in a reduced fuel consumption, either in the coal or gas operation. This economy in heat operation is further accomplished by means of a specially designed burner, which will function efficiently with a lesser number of gas orifices than will the ordinary burner and still produce the amount of heat required for effective operation of the range. In fact the number of gas orifices may be reduced from the usual number of approximately 160 to 90, and since the gas pressure remains the same the amount of decrease in gas consumption is represented by the ratio between the number of orifices. In addition to the circulation system and the design of the burner, fuel economy is effected by the positioning of the burner, so that each row of orifices will be at the bottom of a separate and distinct flue, so that the products of combustion from each row of orifices will pass through the flue designed therefor. This enables the proper directioning of the several paths of the products of combustion in such a way that while one is passing under a grid or shelf another is passing over that same grid and beneath and adjacent other grids. The combustion is further controlled for efficient heat production by means of primary and secondary air inlet vents. The control of these vents is mechanically accomplished by means of the same lever that is used to adjust the range from a coal to a gas burner or vice versa. By the structure herein designed the gas manifold is concealed. The conventional heat regulator is also attached. The specific method of opening and closing vents from the unit control is believed to present distinct novelty. The oven is set for baking automatically when the gas is turned on. The burner 53 is ignited in the conventional manner.

With these and other objects in view my in vention has relation to certain novel features of construction and arrangement of parts as will be hereinafter more fully described, pointed out in the claims and illustrated in the drawings, in which Fig. l is a front elevation of the range.

Fig. 2 is a. sectional plan view on the line 2-2 of Figs. 1 and 5.

Fig. 3 is a fragmental sectional plan view on the line 33 of Figs. 1 and 5.

Fig. 4 is a transverse sectional elevation on the line 44 of Figs. 1 and 5 with the racks or shelves omitted.

Fig. 5 is a sectional elevation on the line 55 of Fig. 2.

Fig. 6 is an enlarged vertical section elevation, approximately on the line 6-6 of Fig. 2.

Fig. '7 is an enlarged fragmental sectional plan view on the line 'll of Fig. 6.

Fig. 8 is a fragmental sectional elevation on the line 88 of Fig. 5.

Fig. 9 is an enlarged fragmental sectional elevation of the lower left and lower right corners of the oven, being the same views as shown in Fig. 5 enlarged with the racks omitted, and dampers open.

Fig. 10 is a bottom plan view of the deflector plate positioned in the center of the left side of the oven.

Fig. 11 is a perspective view showing the connection between the damper bars in the rear right hand corner of the oven.

Fig. 12 is an enlarged plan view of the gas bumer, and r Fig. 13 is an enlarged transverse sectional elevation taken on the line |3|3 of Fig. 12.

Fig. 14 is a perspective View of the lower or secondary air damper.

Fig. 15 is a perspective view of the deflector plate, which extends rearwardly from the front wall and over the, neck of the burner to approximately the first burner orifice.

Fig. 16 is a lower edge view of the deflector, which separates the products of combustion in their passage from the first and second channel of the gas burner, reading from right to left in the drawings, which show the burner in combination with other range construction.

In Fig. 5 the path of the products of combustion from the coal fire box through the range to the stack is shown by full line arrows and the path of the products of combustion from the gas burner through the oven to the stack is shown by broken line arrows.

Numeral I! designates the frame of the range, which is supported on the four legs 88.. The frame comprises the bottom l9 and the top 26. Numeral 2| designates the left wall and numeral 22 the right wall and numeral 23 the rear wall of the frame ll. Numeral 24 designates the front wall to which are secured the oven door 25 and the ash and coal door 26, in the conventional hinged manner (not shown). The hinges for the oven door are at the bottom and for the ash and coal door at the left.

Numeral 21 designates a glazed opening in the front wall 24 to make the gas flame externally visible and numeral 28 designates a cleanout door for the flue, whereby soot etc. can be removed. Numeral 29 designates the handle for the ash and coal door 26 and numeral 30 the handle for the oven door 25.

Numeral 3! designates the conventional thermometer positioned centrally in the oven door 25. Numeral 32 designates the splash panel secured to the rear wall 23 of the frame ll at the rear flat top 26. Numeral 33 designates the heat control device, which is visible through the upper portion of the front wall 24 centrally.

Numeral 34 designates a separating wall between the gas and coal portions of the range. The separating wall 34 is vertically positioned and connected to the top 20, the bottom l9,

the rear wall 23 and the front wall 24. Numeral 35 designates an opening in the upper portion of the separating wall 34 extending substantially from front to rear of the range. Numeral 36 designates the fire box having its walls lined with fire walls 31. The fire box 36 is positioned in the upper portion of the frame H to the left of the separating wall 34. Beneath the fire box 36 is positioned the ash pan 38 and between the fire box 36 and ash pan 38 are positioned the shaker grates 39.

Over the fire box in the top 20 are positioned gravitationally the plates 46, which cover the conventional coal holes for access to the fire box 36 through the top 26. Over the portion of the frame I! to the right of the separating wall 34 in the top 20 and integral therewith are formed the plates 4| and 42, in which are gravitationally detachably positioned the gas grids 43. Numeral 44 designates a substantially horizontal plate secured to the right wall 22, to the front Wall 24, and to the rear wall 23. Intermediate its length a substantial distance from the left of its center it slopes at an angle upwardly to meet the Wall 34 to which it is attached above the slot 35.

Numeral 45 designates the oven, which is conformed by the top 46, the side wall 4! and the floor plate 46. The top 46 is in spaced relationship with the horizontal plate 44 forming the flue 49. The side wall 41 is in spaced relationship with the right wall 22 forming the flue 5B. The floor plate 48 is in spaced relationship with the bottom l9 forming the flue 5|. The top 46, the side wall 4'! and the floor plate 48 are secured to the front wall 24 and the rear wall 23. The top 46 and the floor plate 48 are in horizontal planes and side wall 47 is in a vertical plane. The left end of the top 46 is bent at an angle downwardly and its end is secured to the separating wall 34. The left end of the floor plate 48 is bent downwardly at right angles to the main portion and its end is joined to the bottom IS in spaced relationship with and parallel to the separating wall 34. By the construction, above described, the burner space 52 in which is positioned the gas burner 53 is formed. In the side wall 41 of the oven 45 is formed the rectangular slot 54. To the side wall 41 of the oven 45 is formed the rectangular slot 54. To the side wall 47, above the rectangular slot 54 is attached the separating plate 55 by means of the bolts 56 in such a manner that the larger part of the separating plate is suspended vertically in the flue 56 in spaced relationship with the side wall 41 and the right wall 22 over the rectangular slot 54. The lower end of the separating plate 55 terminates in the horizontal plane of the floor plate 43. Numerals 51 designate brackets secured to the side wall 41 in order to support the grids or shelves 58 and 59 respectively selectively.

Numerals 66 designate a baille vertically positioned between the floor plate 48 and the bottom I9. The bafile wall 60 is secured at one end to the rear wall 23, and terminates a short distance from the front wall 24, forming an opening or space 64 between said front wall and the forward edge of the baffle wall 66. (See Fig. 3.) Numeral 62 designates the stack for the products of combustion from both the coal and the gas sources of combustion. The stack 62 is a flue secured vertically to the rear wall 23 and at its bottom is in fluid communication with the flue 5 I, through an opening 5|a formed in the rear wall of flue 5|. To the upper end of the stack 62 may be secured a smoke stack (not shown) the lower end of the stack 62 is blocked with an integral angular plate secured to the rear wall 23. In the stack 62 may be positioned a conventional damper 63.

The products of combustion from the coal fuel may be traced from the fire box 36 through the slot 35, the flue 49, the flue 50 to the right of the separating plate 55 through the right hand side of the flue 5i and around the opening 64 (see Fig. 3) through the left hand side of flue 5|, and into the flue 6 I into the stack 62 and out through the smoke stack. It will be seen that by this circulation the products of combustion will be forced to pass completely around the top side and around the bottom of the oven 45. In order to prevent these products of combustion from passing around the lower end of the separating plate 55 and then upwardly between the separating plate 55 and the side wall 4! through the rectangular slot 54, in the side wall 41, a sliding plate 65 is provided, which is placed in sliding engagement over the rectangular slot 54 on the inside of the side wall 41. The sliding plate 55 is in vertical sliding engagement with the inner face of a bracket secured to the wall 47, which bracket has an opening corresponding to the opening 54 in the side wall. The sliding plate 65 must remain in its lower position when coal is used as a fuel for the reason previously described, but it must be in its upper or open position when the gas burner is used for the source of heat. This sliding plate 65 could be actuated by a conventional device, exterior to the right wall 22 near its bottom, but this is inconvenient and impractical. It is obviously necessary that the sliding plate 65 be closed when coal is used as a fuel. If it is not closed under such a condition, the products of combustion from the coal, including the smoke and soot, will pass through the rectangular slot 54 into the oven 45. Where such a damper is positioned in the conventional structure, and through lack of knowledge or accident, it is left open when coal is used, the entire baking operation in the oven is practically destroyed.

. In the construction, herein described, it is aimed to make such a fatal mistake impossible. It must be remembered that both the gas fuel and the coal fuel are not used simultaneously in a structure of the type herein described. It is understood that the entire change from burning coal to gas may be accomplished in the structure herein described by the simple partial rotation of the handle 56, which is conventionally positioned. The action of the sliding plate 65 is only one of the functions to be performed by the partial rotation of the handle 66, as will be subsequently described. As best shown in Fig. 8, the sliding plate 65 is formed on the lever 61 at its free outer forward end. The lever B! is pivotally mounted on a bracket 68, which in turn is secured horizontally to the side wall 41 by the bolts 56. As mentioned above, a slot 68a. identical with slot 54 is formed in the bracket 68. The fulcrum of the lever 61 is at the pivot 69. The pivot 69 is positioned near the lower rear right portion of the plate 68. The short arm 10 of the lever 61 may be moved vertically up and down. The sliding plate 65 is of such shape and size that when the lever B! is in its horizontal position (that shown in solid line in Fig. 8), the sliding plate covers the rectangular slot 54 but when the lever 61 is oscillated to the position shown in dash line in Fig. 8, the rectangular slot 54 is partially or entirely uncovered. In order to act as a guide and as an upper and lower stop for the movement of the free end of the lever 61 and hence the sliding plate 65, the guide H is provided, which is secured to the plate 68 at its ends, so that the portion between the ends is in spaced relationship with the plate 68, and so that the end of the lever 61 and the sliding plate 65 may move arcuately between the guide H and the plate 68. The short arm 10 has the hook '12 formed therein for engagement in the notch 13 of the rocker arm 14, which is pivotally secured to the rear wall 23 of the oven 45, by means of the pivot 15. The rocker arm 74 may thereby be pivoted or oscillated around the pivot 15 by moving the'short arm 16 of the rocker arm '14 vertically. It will be seen that by the structure thus far described the vertical movement of the short arm 16 will move the lever El and hence the sliding plate 65 vertically and arcuately. The movement of the lever Bl is, therefore, by the construction described controlled by the movement of the short arm 10, which is at the lower rear left corner of the oven. The pivot 15 is secured to the rear wall 23 of the oven. It is to be understood that obviously the means for actuating the damper plate 65 may not pass directly through the oven, which accounts for the fact that the actuating device must be secured to the walls of the oven and pass around its rear corners. To

the short arm 16, near its extreme left end, is secured the rod H, which passes vertically downwardly at the rear of the pocket 52. Before describing the further means for the movement of the rod 11, it becomes necessary to describe the remainder of the oven construction.

Numeral l8 designates a vertical plate in spaced relationship with the separating wall 34. The vertical plate 78 does not extend to the bottom I9, but terminates midway between the two left channels of the gas burner 53. The upper edge of the vertical plate 18 is bent inwardly and in spaced relationship with the top 46, leaving the space 19 between the top of the bent portion of the vertical plate 18 and the top 46. On the inner edges of the vertical plate 18 is formed a support for the grid 58. The products of combustion from the left channel of the gas burner 53 pass upwardly between the vertical plate 18 and the separating wall 34 and to the right between the top 46 and the upper grid 18. These products of combustion are then turned by the top 46 and the side wall 41 in their directional movement downwardly through the upper grid 58. As shown in Figs. 3, 4 and 9, the plate 18 is provided with end walls 18a bent at right angles thereto, and is welded or otherwise secured to another plate about to be described.

Numeral 80 designates a separating plate in spaced relationship with the vertical plate 18 and joined to the front wall 24 and the rear wall 23, by screws 8|. The separating plate 80 together with the plate 18 form a small flue 82, extending from the burner to about the horizontal center of the oven. In the lower portion of the plate 80 is formed a pocket 83, for a purpose to be described. The extreme lower end of plate 80 is bent at an angle to the left so that its extremity lies midway between the first and second channels of the burner.

It will be seen that by this structure the products of combustion from the middle portion of the gas burner 53 pass upwardly through the small flue 82 between the separating plate 80 and the vertical plate 18, over the top edge of the separating plate 80 and beneath the upper grid 58 into the space 84 and from there in contact with the side wall 41 and mixing with the products of combustion from the space I9, which have passed through the grid 58.

It will likewise be seen that the right portion of the gas burner 53 is positioned between the left wall of the flue 5I and the lower portion of the separating plate 80 forming a short flue 85. The products of combustion from this portion of the gas burner 53 pass through this flue 85 into the oven beneath the lower grid 59 and through the grid 59 there meeting the products of combustion from the space I9 and 84 and then if the sliding plate 65 is open pass through the rectangular slot 69a and 54 between the separating plate 55 and the side wall 41 downwardly into the flue 5| through the opening 5Ia, into the stack 62 to the smoke stack (not shown). It becomes evident that the path of the products of combustion from both the gas and coal are the same from the lower right hand corner of the range.

In order to cause the products of combustion to flow laterally to the right and under the lower grid 59 upon leaving the flue 85, rather than upwardly, a deflector plate 86, a bottom plan View of which appears in Fig. 10, is positioned above this flue. The deflector plate 96 is formed of insulation material covered with metal, and is A hingedly connected to the plate 89 as at numeral 81. Fixed to the under side of this deflector plate at the front and rear ends thereof are two angles 88, which serve as supports when the deflector plate is positioned horizontally on the floor plate 48, i. e. when gas is used. When coal is used, the plate 86 is swung upwardly, as shown by broken lines in Fig, 9, and rests within a pocket 89 formed in the plate 89. The purpose of the pocket 83 referred to above is to accommodate a channel 99 fixed to the plate 86. The channel 99 serves as the left hand support for the lower grid 59. When coal is the fuel, and the deflector plate '86 is in its raised position, notches 9I, cut in the angles 98, support the grid 59 at the left side thereof. The upper surface of the channel 99, when the deflector plate is horizontal, and likewise the notches 9I, when the plate is in its elevated position, are in the same horizontal plane as the lower right hand grid support 51.

In order to direct the products of combustion from the flue into all portions of the oven under the grid 59, a series of ribs or beads 92 are formed on the bottom side of the deflector plate 36. As shown by the arrows in Fig. 10, the ribs 92 direct some of these products to the rear right hand corner of the oven, others to the front right hand corner, while some pass directly across the central lower portion of the oven to meet those from the spaces I9 and 84 before passing out of the opening 54.

It is evident that the sliding plate 65 must be in its open position when gas is used as a fuel, otherwise the products of combustion will find no exit from the oven 45. It is, therefore, seen that it is absolutely essential that the sliding plate 65 be in the proper position in the case of both the gas and the coal fuel. It is also observed in Fig. 5 that the rocker arm I4 slides vertically in a guide 93 secured to the rear wall 23.

The specific construction of the gas burner 53 is best shown in Figs. 12 and 13. It consists of a single casting having the large forward tubular portion 94 to which are integrally joined the three tubes 95, formed so as to establish fluid communication between each of the tubes and the remaining tubes. In the upper surfaces of the tubes 95 are formed the orifices 96, which in the instance of the two left tubes are vertical, but which in the right tube are at an angle of ap proximately forty-five degrees extending to the right. This latter feature is to cause the flame from the right most tube to extend at an angle of forty-five degrees rather than vertically upwardly so that the flame will be projected toward the deflector plate 86, at the upper end of the short flue 85.

Numeral 91 designates the conventional gas pipe inlet. Numeral 98 the gas manifold and numerals 99 the gas valves and numeral I99 the pipes leading from the gas valves 99 to the bumers (not shown). The burners and the pipes I99 and the gas manifold 98 are positioned in the space between the horizontal top plate and the horizontal plate 44 in the conventional manner in operative position relative to the gas grids 43. The gas pipe inlet 99 passes from the rear of the range to the front of the range in a space between the right wall 22 and the horizontal plate 44 and the plate 42. Numeral I9I designates a vertical wall connecting the plate 42 and the horizontal plate 44 in spaced relationship with the right wall 22 and connected tothe front wall 24 and the rear wall 23. Numerals I02 designate the gas valve handles, which extend from the gas manifold 98 through the front wall 24. The gas burners are operated by means of the handles I92, the latter being the only portions of the gas burners protruding beyond the front wall 24 of the burner.

The dial and knob for operating the oven telnperature regulator are seated in a pocket and as mentioned are in view of and accessible to the operator. As shown particularly in Fig. 6, gas from the manifold 98 enters a valve I93, formed in the regulator, by means of pipe I04. From the regulator the gas is supplied to the burner 53 by means of pipes I95, whenever the handle 66 is moved to operate the valve I93. Handle 66 is secured on the stem I96 of valve I93 in the conventional manner.

Formed on the valve stem I96, is an arm I91, pivotally connected to a longer link I 98. A more or less triangularly shaped plate I99, is pivotally mounted at I I9 to a boss III which extends forwardly from the forward end wall II2 of the flue 49.

It is understood that the wall I I2 serves as the end wall of the flue 49 only in the region of the unit control valve, as shown in Fig. 2. To the right, beyond the temperature regulator the flue 49 extends from front wall 24 to rear wall 23 as previously described. Link I98 is pivotally connected at H3 to plate I 99, a second link Ill being likewise so connected thereto at II5. Numeral I I6 designates a rod connected to link H4 at its upper end and is pivotally secured at its lower end in an upstanding ear or lug II I formed integral with a damper II 8, which extends from front to rear at the bottom of the burner pocket 52. Rod H6 is mounted at the forward end of said damper H8, and a companion rod I7, previously referred to, is pivotally secured to a similar ear H9 at the rear end of damper I I8.

From this it is seen that movement of the handle 66, and thereby of the valve stem I96, to the right (which allows gas to pass to the burner) raises the link I I4, rod II 6 and damper II8. At the same time obviously, rod TI is raised thereby as previously explained, causing damper plate 65 to uncover the opening 54. Turning handle 66 to the left, shuts off the gas supply to the burner,

lowers the rods I I6 and I1, and thereby closes dampers H8 and 65, so that the oven is ready for baking with coal.

Damper H8 governs the supply of secondary air admitted through an elongated rectangular opening I29 in the bottom I9 under the burner, Figs. 9 and 7. In order to further regulate the amount of air admitted through opening I20, an angle I2I is welded to the under side of damper H8. In the closed position of the damper H8, this angle extends throughthe opening I20, and has then no function. The downwardly extending flange of the angle, however, has semi-circular cut out portions I22 as illustrated particularly in Fig. 14. It is obvious from an inspection of Fig. 9 that when damper H8 is but slightly raised only a small amount of secondary air is admitted through the upper arc of the cut-out portions I22. It is also evident that when the damper H8 is raised a greater distance, caused by feeding more gas to the burner, a greater amount of secondary air is admitted. The advantage of the arcuately cut out angle constructions I2I and I22, is that it allows the air to enter gradually and prevents a sudden inrush of air as would happen without this arrangement.

Primarily air is admitted through a small opening I23, in the bottom I9, in front of the burner adjacent the front wall 24, Figs. 6 and '7. Numeral I24 designates a small damper pivoted in lugs I25, which lies over this opening and rests upon damper H8 as shown. Damper H8 is pivoted at I26 at the front and rear walls of the range, and the front end thereof also partially covers the opening I23. The damper I24 rests by gravity upon damper H8, and both dampers operate in conjunction with one another. Therefore when the handle 65 is turned, raising or lowering damper H8 as described, primary air damper I24 is also raised or lowered.

In the event a greater amount of primary air than is necessary for the eificient operation of the burner should be admitted such cold air would find its way into and circulate in the oven tending to chill the oven temperature. To prevent this, a baffle plate I21, shown in Figs. 6 and 13 is secured above the opening I23, to the wall 34 and the vertical left wall of the flue This plate extends from the front wall 24 rearwardly to approximately above the first burner orifice 96, and slightly above the burner. By this means, the excess primary air is deflected over the burner flames, and is, therefore, heated before finding its way into the oven proper.

The forward end of the burner is supported by the pipe I05. Numeral I28 designates a bracket, fixed to the rear wall 23, which bracket supports the rear end of the burner.

In Fig. 16 is illustrated the preferred construction of the lower extremity of plate 80. As stated this extremity lies between the first and second tubes of the burner and is preferably corrugated as at numeral I29 so as to more certainly divide the secondary air equally on either side thereof.

What I claim is:

1. In a combination gas and coal range, an oven, a burner, primary and secondary air openings in the bottom of said range, dampers operatively positioned over said primary and secondary air openings, the damper for the primary air opening supported by and in frictional engagement with the damper for the secondary air opening, so that the movement of the secondary damper actuates the primary damper, a rod connected to said secondary damper at one end and to a link at its other end, a triangularly shaped I plate pivotally mounted to an end wall of said oven, said link pivotally connected at its free end to said triangularly shaped plate, a second link pivotally secured at one end to said triangularly shaped plate, a gas valve for the control of said burners, a valve stem operatively forming a part of said gas valve, an arm formed on said valve stem, the free end of said second link secured pivotally to the free end of said arm so that a rotation of said valve stem will open and close the dampers for the primary and secondary air openings.

2. In a combination gas and coal range, an oven, a burner, primary and secondary air openings in the bottom of said range, dampers operatively positioned over said primary and secondary air openings, the damper for the primary air opening supported by and in frictional engagement with the damper for the secondary air opening, so that the movement of the secondary damper actuates the primary damper, a rod connected to said secondary damper at one end and to a link at its other end, a triangularly shaped plate pivotally mounted to an end wall of said oven, said link pivotally connected at its free end to said triangularly shaped plate, a second link pivotally secured at one end to said triangularly shaped plate, a gas valve for the control of said burners, a valve stem operatively forming a part of said gas valve, an arm formed on said valve stem, the free end of said second link secured pivotally to the free end of said arm so that a rotation of said valve stem will open and close the dampers for the primary and secondary air openings, the side wall of said oven having a rectangular slot formed therein, a lever pivotally secured to said side wall so that in the movement of said lever it may be caused to open or close the rectangular slot in the side wall of said oven, a rocker arm pivotally secured to the rear wall of said oven and having its one end in operative frictional engagement with the free end of said lever, a rod pivotally secured to the free end of said rocker arm, the opposite end of said rod secured to the damper operatively positioned over the secondary air opening in the bottom of said range, so that when said valve stem is actuated it will actuate said sliding plate over the rectangular slot in the side wall of said oven, in addition to performing the previous functions.

3. In a combination gas and coal range, an oven, a burner, primary and secondary air openings in the bottom of said range, dampers operatively positioned over said primary and secondary air openings, the damper for the primary air opening supported by and in frictional engagement with the damper for the secondary air opening, so that the movement of the secondary damper actuates the primary damper, a rod connected to said secondary damper at one end and to a link at its other end, a triangularly shaped plate pivotally mounted to an end wall of said oven, said link pivotally connected at its free end to said triangularly shaped plate, a second link pivotally secured at one end to said triangularly shaped plate, a gas valve for the control of said burners, a valve stem operatively forming a part of said gas valve, an arm formed on said valve stem, the free end of said second link secured pivotally to the free end of said arm so that a rotation of said valve stem will open and close the dampers for the primary and secondary air openings, the side wall of said oven having a rectangular slot formed therein, a lever pivotally secured to said side wall so that in the movement of said lever it may be caused to open or close the rectangular slot in the side wall of said oven, a rocker arm pivotally secured to the rear wall of said oven and having its one end in operative frictional engagement with the free end of said lever, a rod pivotally secured to the free end of said rocker arm, the opposite end of said rod secured to the damper operatively positioned over the secondary air opening in the pottom of said range so that when said valve stem is actuated it will actuate said sliding plate over the rectangular slot in the side Wall of said oven, in addition to performing the previous functions, an angle 5 having semi-circular cut out portions in the lower vertical face secured to the damper for said secondary opening.

WILLIAM A. BUSIEK.

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