US 1830063 A
Description (OCR text may contain errors)
J. JUNGERS A ovEN Filed Feb.- 15, 1929 Re. l
Nav. 3, 1931.
/N VEN TOR A TTORNE' Y I'IG'. 2
W/TNESSES vio Patented Nov. 3, 1931 UNTED STATES PATENT oFFlcE JOHN JUlil'GrE-RSJ 0F GRAFTON, WISCNSIN, ASSGNOE. TO JUNGER-S STOVE AND RANGE COMPANY, OF GRAFTN, ISCONSIN, A CORPORAIEON OF WISCONSIN OVEN Application :filed February 15,` 1929.
The invention relates to ovens and more particularly to oven bottoms.
ln that type of oven in which the dishes to be baked are set directly on the oven bottom, it is important that the oven bottom should be level in order to insure proper baking, since buckling or warping of the oven bottom will tilt the containers set thereon and thereby cause uneven baking, especially when preparing pastry such as pies.
Considerable diliiculty has been experienced in devising an oven bottom which can be constructed to present a level surface in C in use.
the first instance and which will remain level Oven bottoms have been previously constructed both of sheet metal and castings, but the sheet metal bottoms heretofore devised have a tendency to buckle after being placed in service, while the cast metal bottoms frequently warp in the casting operation and later warp when placed in service. It has been proposed to construct a cast metal oven bottom with integral re-enforcing ribs therebelow, but this type of oven has not been entirely satisfactory because of the uneven thickness of the metal at different parts of the casting and because the ribs favor the accumulation of foreign matter from the flue gases passing below the oven.
In order to obviate these difliculties, 1t is an object of the present invention to provide an oven bottom which will be flat and level when placed in service and which will remain level after long continued use, these characteristics being obtained by corrugating the material of the oven bottom to present an undulatory appearance in cross-section, the thickness of the metal being substantially uniform at all points of the baking surface.
.another object of the invention is to utilize the shallow parallel channels at the upper surface of the bottom as Ventilating passages below the baking containers.
A further object is to provide a corrugated oven bottom which can be constructed of either cast metal or sheet metal and which is particularly adapted to cast metal construction to practically eliminate warping in the casting operation.
A further object is to construct an oven Serial No. 340,286.
wall which can be used either as a bottom or as a top.
The invention further consists in the several features hereinafter set forth and more particularly defined by the annexed claims.
In Vthe accompanying drawings, Fig. 1 is a diagrammatic elevation of an oven embodying the top and bottom members of this nvention, the oven in general being shown in dotted lines except for the top and bottom members, and parts of the bottom member being broken away and shown in transverse section and Fig. 2 is a top plan View of the oven bottom.
nthese drawings, the numeral 10 designates the oven of a cook-ing stove, which is provided with the usual heating flue l1 thereabout leading from the combustion chamber (not shown).` rl"he oven 10 comprises side walls 12 connecting the bottom and topmembers 13 and Marespectively, of this invention. The bottom 13 is here indicated to be a cast metal plate although it may, if desired, be
'formed of pressed sheet metal of suitable thickness. Thefbottom consists of a baking portion 15 which is provided with depending marginal flanges 16 having apertured bosses 17 formed thereon for connection with the side walls of the oven. At the side edge of the bottom from which the hot flue gases enter the space beneath the oven bottom, the depending flange portions may be omitted in order to avoid the formation of a pocket below the bottom and to avoid unnecessary Vobstruction to the low of fiue gases below the bottom.
The baking portion 15 of the oven bottom is smoothly corrugated to present shallow parallel troughs 18 at the upper surface, which are adapted to form Ventilating passages under any cooking or baking container 19 resting on the oven bottom. rlhe thickness of the baking portion 15 of the oven bottom is substantially uniform at all points to insure the maintenance of even baking temperature, and the undulating bottom surface of the baking portion 15 presents no material obstruction to the iiow of flue gases therealong and avoids collection of foreign matter thereon. The shallow rounded troughs 18 preferieu ably terminate short of the opposite side edges of the bottom plate, as seen in Fig. 2.
In the operation of casting the bottom plate, it is found that the coniguration of the plate avoids any tendency to warping and When ordinary care is exercised in the molding and casting operation, it is practically impossible to produce an imperfect Warped casting. Alfter the oven bottom has been installed in the oven, the configuration of the bottom plate prevents warping and buckling thereoic in the repeated heating and cooling operations to which the bottom plate is subjected, so that the oven plate Will remain level for an indefinitely long period of time. The corrugated configuration of the bottom member also provides an effective radiating area which is greater than that present in a plane bottom.
llhen the plate is used for other Walls of the oven, and particularly the top Wall thereof, the nen-warping characteristics of the plate avoids straining of fastening connections With other parts of the stove. The termination of the corrugations short oit the opposite edges of the plate serves to improve the rigidity of the plate and facilitates the cleaning operation at the adjacent side Walls when the plate is used as an oven bottom.
What l claim as new and desire to secure by Letters Patent is:
l. An oven Wall member comprising a rigid metal plate oi substantially uniform thickness having parallel corrugations formed therein, and each corrugation terminating at opposite ends in spaced relation to the opposite edges ot the plate.
2. An oven Wall member comprising a rigid metal plate of substantially uniform thickness having parallel rounded corrugations formed therein and fiat edge portions at the opposite ends oi said corrugations, said corrugations at their ends merging smoothly into said llat edge portions.
3. An oven Wall member comprising a rigid metal plate of substantially uniform thickness having parallel corrugations 'formed therein and terminating at opposite ends in spaced relation to opposite edges or" the plate7 and said plate having at said opposite edges marginal laterally extending integral ilanged portions.
In testimony whereof, l affix my signature.