US1681773A - Cooking stove - Google Patents

Description

F. 5. LANG cooxme STOVE Filed June 20, 1925 INVENTOR 57/? J Zaxry m ATTORNEY Patented Au 21, 1928.

UNITED STATES PATENT OFFICE.

FRANK S. LANG, F SEATTLE, WASHINGTON.

COOKING s'rovn.

Application filed June 20, 1925. SerialNo. 38,425.

a The object of the present invention, gen-' erally, is the perfecting of stoves of this character.

More specific objects and advantages of the invention will appear in the following specification.

The invention consists in the novel con struction, adaptation and combination of parts, relating more especially to the fire box, the flue system and the means for regulating 15 the same, as hereinafter described and claimed. 1

In the accompanying drawing,-

Fi-gure 1 is an end elevation of a stove embodying my invention; Fig. 2 is a longitudinal vertical section'of the same; Fig. 3 is a view similar to Fig. .2 illustrating parts shown therein to an enlarged scale; Fig. 4 is a transverse section taken substantially on line Al-t of Fig. 3; and Fig. 5 is a view of the fire-box liner-plates which are shown assembled in Figs. 3 and 4-, said liner-plates being disposed to afford a face view of each.

In said drawing, the reference numeral represents one of the end walls of the stove shell, the other end wall is designatedby 11-; 12 is the front wall, and 13 is the back wall; said, walls extendingfrom the bottomwall 14 to the stove top 15. VVit-hin the stove shell is an oven which, as shown in Fig. 2, is

16having a top wall 17, end walls 18 and 19, and a floor wall 20, which oven walls are disposed in spaced relations respectively with the top wall 15, end walls 10 and 11, and the bottom wall 11 of the stove shell or casing. Extending from the oven portion 16 and of less depth than the latter is an extension 21 having a top wall 22; the end wall 10 of the stove shell serving as the endwall for said oven extension, and to which end wall 10 the floor of the entire oven extends.

Such form of oven affords in a stove of small size an extremely wide oven space between the walls 10 and 1.9 to accommodate pans of large size. The fire-pot of the stove is provided in the space above the top wall 22 of the oven extension 21 and between the walls 10 and 1.8. This fire-pot communicates through a horizontal flue 23 located above the oven, and a downflow flue 24 provided beformed to provide a relatively large portion I tween the walls 11 and 19, with'a horizontal return flue 25 provided below the oven floor 20. The last named flue .25 has an outlet 26 (Fig. 2) opening into an exhaustfiue 27, Fig. 4, from the top of which it connects with the chimney pipe 28. An opening29 in the wall 13 provides direct communication be tween the fire-pot and the upper portion of said exhaust flue. This opening 29 is, how ever, closable--fully or partly-by means of a damper 30 '(Fig. l) which is regulated as by means of a controlling rod 31 connected to the damper arm 32 shown in Fig. 1.

Provided within the lire-pot are liners, shown detachcdin Fig. 5, of brick or metal.

More particularly, said liners comprise an imperforate bottom orfloor member 33, end men'ibers 3d and 35 and side members 36 and. 37. The bottom member 33 consists of a plate having a plane central portion with depending spaced apart legs or ribs 38 to sup-' port the member above the tire-pot floor 22 withan air duct 39 therebetwee' Extending upwardly from the front and rear edges, respectively, of the plane central portion of the liner 33 are flanges lO and 41:1 which are inclined, as shown in Fig. 3, to have their upper ends contact with the firepotwalls 10and 18. I v

The flange ll, however, is recessed as at 42 (Fig.5) to provide'a channel for the passage of air between the wall 18 and the flange 41 into a duct 4-3 thereabove back of the liner 3i.

As shown in Fig. 3,, the liner 34 is supported upon a shoulder 44 of the flange. 4:1 backof protuberances such as 45 of the referred to flange.

As shown, the front liner 35 is supported upon the bottom liner 33 and between protuberances 46 thereof and the flange 40. The liner is held in such relation with respect to the'casing wall 10 so as to afford a duct 47 for the passage of air between draft openings 18 provided in the upper portion of the casing wall 10 and ports 49 which are provided in the bottom of the liner 35 immediatelyv above the bottom liner 33 of the fire-pot. 50 represents a grid damper for regulating the effective sizes of the draft openings 18 to control the supply air which it is desired to admit below the fuel in the fire-pot for combustion purposes.

. Also provided in the stove casing end wall 10 is a series of apertures v51 through which is supplied what may be termed secondary combustion air into the duct 39 whence such air passes through the duct 43 to eventually escape through apertures 52 of the liner 34,-

into the fire-pot above the fuel. The apertures 52 are disposed to direct the secondary air passing therethrough downwardly and g for which purpose such apertures are located The damper plate is then moved into its closed position, whereupon the gaseous products of combustion are compelled to pass in a circuitous path through various flues before reaching the chimney connection.

By thus directing the hot combustion products, the heating of the oven is effected, and

i which. inversely, renders the oven walls 18 and 22 hot to coact with the hot liners 33 and 34: for preheating the secondary air prior to its delivery through the aperture 52 into the fire-pot. It is tobe noted that the primary air is admitted in a substantially horizontal direction into the bottom of the combustion space, and that the secondary air is admitted into the upper rear portion thereof to ensure,

as nearly as practical, the completeburning within the fire-box of the combustible p ortions of the fuel. Such arrangement of the two series of air inlets tends to effect within the fire box a circulatory motion of gases which causes a more intimate, mixture of the air with the combustible gases derived from the fuel.

While I have illustrated and described the embodiment of the invention now preferred by me, I do not wish to be understood as confining myself specifically thereto except as limited by the following claims.

hat I claim, is,-

1. In a cooking-stove, a fire-pot, liners therefor, saidliners including a front memher having ports below an imperforate lower portion, and an imperforate floor member extending between the front and back members, said liners being arranged to provide within the fire-pot two ducts for the admissionof air into the combustion space inclosed by said liners, one of said ducts discharging air through the ports of saidback member into the upper rear portion of said space and the other duct discharging air through the ports of said front member into the lower front portion of said space and immediately above said'fioor member, and means for controlling the last mentioned duct whereby air for combustion purposes is supplied exclusivelyinto the upper rear portion of the combustion space.

2. A cooking-stove having an oven provided in one corner thereof with a reentrant angle, a fire-pot located in said angle, an exhaust flue extending rearwardly from the fire-pot, said fire-pot being provided with air inlet openings disposed at different elevations, a grid-damper forthe upper of said inlet openings, and liners provided within the fire-pot to cooperate with a wall of the fire-pot to provide an air duct extending from the upper of said inlet openings to the lower front portion of the fire-pot, and a second duct extending from the lower of said inlet openings through the fire-pot into the upper rear portion of the space which is inclosed by the fire-pot liners, neither of said ducts communicating with said exhaust flue except through the medium of the space enclosed by said liners.

Signed at Seattle, Washington, this 20th day of May, 1925. i I

FRANK s. LANG.

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