US2140110A - Combination heating and cooking - Google Patents

Description

Dec. 13, 1938. .1. E. LEONARD 2,140,110

COMBINATION HEATING AND COOKING RANGE Filed Jan. 21 1936 Z/ FIE ZE Z6 7 UDUUIJUUI] EDI] INVENTOR.

. jajep/i f. [60 arc/ BY g j ATTORNEY.

Patented Dec. 13, 1938 UNITED STATES I 2,140,110 4 commm'rron HEATING AND COOKING RANGE Joseph E. Leonard, Berkeley, Calii'., asslgnor to Hammer-Bray Company, Ltd., Oakland, Calif., a corporation of Nevada Application January 21, 1936, Serial No. 60,013

3 Claims.

The invention relates to household stoves or ranges which have built in as a part thereof a gas-operated air-circulating heater usually located at one end of the stove.

An object of the. invention is to incorporate in the range a heater unit of the character de-- scribed which will not only provide for efficient heating of the air, but will insure ready and free exit of all the air heated in the unit and a minimum loss of heat by conduction through the contiguous stove parts.

Another object of the invention is to provide a heater and fire box combination for the range in which the relative positioning and arrangement of the heater and fire-box parts are such that the heat from the fire-box may radiate directly through the same opening which affords the exit of the hot air from the heater.

A further object of the invention is to provide a heater and fire-box combination in which the heated products from the chamber are vented to the fire-box in a manner insuring a maximum utilization of the heat resident in the vented products, both for heating the air in the heater and for radiation of heat from the heater.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawing accompanying and forming part of the specification. It is to be understood, however, that variations in the showing made by the said drawing and description may be adopted within the scope of the invention as set forth in the claims.

Referring to said drawing:

Figure 1 is a perspective view of a range embodying the heater and fire-box arrangement of my invention.

Figure 2 is an enlarged vertical sectional view of the heater and fire-box portion of the range, the plane of the section being indicated by the line 2--2 of Figure 1.

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure 2.

Figures 4 and 5 are views similar to Figure 2, but showing modified forms of the invention.

As illustrated in the first referred to embodiment of the invention, the heater and fire-box arrangement and design are incorporated in a range 2 of the type known as the table-top, that is in which all of the stove parts are usually located below the cooking top 3 and such top is arranged to be covered by a removable plate or cover 4. In the range shown, the heater, which is designated by the numeral 6, and the fire-box I, are positioned at one end of the range, while oven and boiler compartments 8 and 9 are disposed in superposed relation at the other end of the range. The fire-box is located inwardly of the heater and adjoins, at the end opposite the heater, a top gas burner chamber 12 and a set of warming compartments l3 and I4 arranged one under the other and loth under the chamber I2, the compartmentsbeing desirably provided with drawers l6 ,whose front walls l1 form a closure for the compartments and a portion of the front wall of the stove. It will be seen by reference to Figure 2 that the portion ofthe range comprising the heater and fire-box is of the same vertical dimension as the oven and broiler portion and as the portion made up of the compartments and burner chamber; in other words the heater and box portion extend from the cooking top down to the bottom frame member l8 of the range. In the case of the heater, the lower extremity of the combustion chamber casing l 9 and the burner 2| therefor are located at the immediate bottom of the range, that is, at the member l8, and thus the heating of the air for circulation is initiated close to the floor, and, particularly where the stove legs 22 are short, the air near the floor of the room will be kept substantially as warm as the air at the more elevated levels therein.

As will be clear from Figure 2, the fire-box, which includes the box proper and the ash pit, is preferably coextensive vertically with the heater unit and is contained within a casing 23 whose side wall 24 is spaced from the end wall 25 to provide the heater compartment. The combustion chamber casing [9 of the heater, as previously explained, has its lower extremity at the member I8 and extends upwardly preferably to a point about even with or below the grate 26 of the box. The casing l9 desirably extends for almost the full distance of the stove from the front to the rear side thereof, but is relatively narrow in width with the sides of the casing converging upwardly and spaced from the wall 25 and the casing 23 so as to define vertical passages 28 and 29 for the flow of the warmed air during the operation of the heater. It will be evident that since the casing l9 terminates considerably below the top of the stove, a large space or chamber 3| will be formed between said top and the casing in which the heated air from the passages 28 and 29 may discharge, and in order to permit the ready exit of such air from said space 3|, preferably the entire portion of the end wall 25 lying opposite said space is left open and formed the smooth and ready flow of the-air from'ithe passage 28, as well as from the passage 23, is assured and no trapping of the hot air within the heater and the resultant loss of v heat through conduction to the contiguous stove parts may occur. In order to increase the size of the firebox,

particularly at the upper portion, thereof, theside wall of the box, which adjoins thechamber 3|,- is offset in the direction of such chamber, and" such oflset, in addition to affording the enlargement of the box, serves to more effectively guide the heated air, especially from the passage 28, to the discharge opening 32.

As an effective means ofventing the products in the combustion chamber l9, a-vent pipe 34 connects the topof'the chamber directly'with "the firebox, and such pipeextends' throughthe delivery space 3| and incidentally provides for the additional heating of the air in suchspace.

The vented products, after passing into the fire box, are arranged to discharge therefrom through a'controlled flue opening 36 'in therea'r wall oi the box, and in order'to prevent any ashes or other particles from mnmgmte the vent pipe a shield 31' is positioned over the vent opening 'in the box." f

It will be understood that'a circulation of air will be induced through the passage 28 and the delivery chamber 3|, independent of. the operation of the heater, when the fire box is being utilized for burning trash or other fuel of one kind or another, andit is important, to note that by reason of the fact that the fire box is immediately opposite the opening 32 and practically no portion of the heatereasing or otherobstruction is interposed between the box proper and such opening, the heat generated in the box may radiate directly through said opening. Likewise the heat from the vent pipe 34 may'r'also radiate through the opening. Desirably the vent pipe connects with the Iorward'end of the fire-box so that the vented products are forced to traverse the full length of the box before being allowed to escape through the flue opening 36 at the rearend 01' the box. With this arrangement as con-.

trasted with one when the pipeconnects with the fire box at the middle or rearthereoi', more heat will be extracted from the vented products before the latter may escape'i'rom'the stove and at the same time the wall of the fire box adjoining the delivery chamber 3| will serve more effectively to transmit the heat back to such chamber.

The front of the portion of the range comprising the fire-box and heater is here shown closed by a door 38, and preferably thefront and rear walls of the heater casing l9 are spaced inwardly from the corresponding walls 01' the stove soas to provide additional air heating passages thereat.

In the embodiment of the invention illustrated in Figure 4, the entire side wall 4| of the fire box proper adjoining the heater chamber is offset so as to afiord a relatively large capacity box and yet leave the jchambera'well able to ,efliciently -handle the hotair admitted thereto.

A somewhat more pronounced change is depicted in Figure 5. In this embodiment the combustion, chamber casing 42 of the heater is located practically'entirely under the fire-box, but

' the event pipe 43 of the casing still extends upwardly through the hot air delivery space 3|.

I claim; i

1. In a cooking and heating stove having an incinerator and, an air circulating heater embodied therein, a stove body having a pair of compartments in side by side relation, an incinerator in one ,of said compartments and providing a firebox in the ,top of said; compartment and ,an ashpit under said fire boxsaid-compartmerits being narrowed at said ash pit-with acorresponding widening ofsaid other compartment thereat, 'and a combustion chamber, casing mounted in the widened portion of said; last named compartment and being spaced fromthe sides of said compartment to define anfair heatand circulating passage. I 2.In a cooking and heatingstove havingan incenerator and anair circulating heater .em-

bodied therein, a [stove body, having a. pair :of

compartments in side .by side relation and exj so tending from substantially the rear to thef ront" of said body, an incinerator in one of said compartments and providing a fire box in thetop of said compartment and anash pit under said fire box, said compartment beingnarrowed over a major portion of its depth-at said ash pit with a correspondingwidening of said other .compartment thereat, a .combustion chamber casing mounted in the widened, portionofsaid last named compartment andbeing. spaced from the sides of said compartment to define an air heat ing and circulating passage a burner for heating said casing, and meansfor discharging air in said passage from said body.

g l 3. In a cooking and heating stove having, an

therein, astove body having apair of compartmentsin sidelby side relation withva common compartment,,anda combustionchamber casing mounted in said-last namedycompartment at the widened portion thereof and being, spaced from the sides of said compartment to define-an'air circulating andheating passage.

JOSEPH E. LEONARD. a

1 incineratorand air circulating heater: embodied:

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