US 2599923 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
June 10, 1952 E. A. KRAEMER ET AL 2,599,923
BASE FOR PORTABLE DOMESTIC OVENS Filed April 23, 1951 INVENTORS LEONARD EFINCH Y ELMORE. A. Kaaaman FIG... 2 B wkuw ATTORNEY Patented June 10, 1952 BASE FOR PORTABLE DOMESTIC OVENS Elmore A. Kraemer and Leonard E. Finch, West Bend, Wis., assignors to West Bend Aluminum 00., West Bend, Wis., a corporation of Wisconsin Application April 23, 1951, Serial No. 222,354
1 Claim. 1
This invention relates to improvements in portable domestic ovens of the type particularly adapted for use on the surface burners of gas stoves and the like.
Previously ovens of this type had bases with flat bottoms, the peripheries of which extended over the porcelain surfaced part of the stove. As a result, heat- (including flames when gas is turned on too wide) was transmitted directly against such porcelain surface, causing it to overheat and quickly check, crack, and discolor. In addition, the heat was deflected laterally away from the base and thus was useless in heating the hood of the oven.
It is an object of this invention, therefore, to provide a base for a portable domestic oven which will not cause over-heating of the porcelain surface of a stove on a'burner of which such base is positioned.
Another object of this invention is to provide a portable oven base which will assist in causing heat escaping from the sides thereof to flow vertically upwardly along the outer side of the hood of the oven to utilize some of such heat for maintaining the oven heated.
These objects are accomplished by providing the base with a lower supporting wall which slopes downwardly and inwardly to the foot of the base and placing a number of venting holes in such wall spaced from such foot. The foot of the base which rests on the burner supports is dimensioned so that it will not extend to the edge of the opening in the porcelain coated top of a stove. Any excess heat or flames escaping from the vent holes are far enough above the surface of the stove top to prevent damage thereto. Because of the slope of the supporting wall the heat so escaping will be directed generallyyertically upward and along the sides of the hood and either transfer heat to such hood or insulate such hood from the surrounding cooler atmosphere and thus cut down heat loss therefrom.
The novel features, which are considered characteristic of the invention, are set forth with particularity in the appended claim. The invention itself, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of a specific embodiment when read in connection with the accompanying drawing, in which:
Fig. 1 is a view in side elevation of a base for a portable domestic oven embodying the present invention, part being broken away and shown in section for the sake of clarity in illustration; and
Fig. 2 is a top plan view of the base shown in Fig. 1 with the parts broken away and shown in section.
Referring to the drawing by reference numerals, the portable domestic oven therein shown comprises a base, indicated generally at H], which embodies the hereinafter described invention, and a hood 12 shown in broken line. In use, the oven is supported on the grating 36 of a surface burner such as customarily used in gas stoves. The heat and flames from the burner pass upwardly into the interior of base [0 and are distributed to the interior of the hood. In this exemplification the grate 36 on which the base I0 is mounted is supported by the top 38 of the stove. As such grate and stove top do not form any part of the invention hereinafter claimed and are included only for explanatory purposes they are shown in broken line. As is customary, the top of the stove may be considered as being surfaced lwith porcelain, enamel, or the like.
The base In comprises a heat-distributing plate l4 around the peripheral margin of which are a plurality, of heat transmission holes 20. Below the central portion of the plate l4 there is a secondary plate It which cooperates with plate I4 to form a dead-air space l8. As heat is directed to the underside of the plate I4 it will be deflected and concentrated around the peripheral margins thereof and pass upwardly through the heat transmission holes 20. Thence, such heat will be distributed evenly to the tops and sides of material within the hood without an undue concentration thereof at the bottom of such material. The plate [4 has a depending peripheral flange 22 with a bead 26 on the lower edge thereof. This bead telescopes with a similarly shaped bead on an upwardly extending peripheral flange 24 on the support for the plate. Extending downwardly and inwardly from the flange 24 is a curved wall 28 which terminates in a peripherally extending foot 32. The foot 32 defines a central opening 34 through which heat and flames from a burner are admitted to the interior of the base ID. The curved wall 28 is provided with a plurality of vent holes through which excess heat and flames may escape from the interior of the base [0. With the base positioned as shown in Fig. 1, heat and flames from a burner will strike against the secondary plate It and be deflected radially of the base l0. Much of such heat will be trapped within the confines of the base I!) and by velocity aided by natural convection will rise upwardly through the heat transmission holes 20. However. any excess amount of heat or flames will pass radially outwardly and upwardly through the vent openings 30. These openings, as is shown in Fig. 1, are substantially spaced from the bottom edge of the wall 28 and consequently such excess heat and flames will be far enough away from the surface of a stove top'to prevent damage to surface material thereon. The flames and heat passing through the vent holes 30 will follow the upward curve of the wall 26 andthe heat will rise gen-- erally vertically along the wall of the hood l2. H
Some of such heat may be transmitted through such wall to the interior of; the-hood.- In any 7 event such heat, enveloping-the outside of the hood, will lessen the loss of heat from the interior of said hood and keep its temperature more constant. The diameter of foot32 is dimensioned so as to be smaller than the diameter of a standard opening in a stove top and hence such foot will not project over the stove top when properly positioned on the pot support. Because of the upward and outward slope of the wall 28 andithe spacing of the vent holes 30 from the bottom .of such wall, the heat radiating from such wall and escaping frornsuch ventsv will not be transmitted to the'surface of the stove top in a .degree sufficient to cause damagerthereto. l
Althoughonly one embodimentof the invention is shown and described herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claim: v
,We claim: a 1 r l rA. basewior a portable domestic oven having a heat-distributing. plateprovided with a plurality 4 of heat transmission openings in the peripheral margin thereof whereby heat is transmitted directly to the interior of the oven from the interior of said base, a peripheral flange depending from said plate and provided with means for supporting an oven hood on the exterior of said flange, a support for said plate comprising a curved wall extending downwardly and inwardly from said peripheral flange, said wall terminating 'at its bottom in a peripherally extending foot, said foot projecting inwardly of said wall to define a large central opening to the interior of said base, and a plurality of vent holes in the upper part of said curved wall adjacent said flange whereby heat is transmitted directly from the interior of said base to the exterior of said flange.
ELMORE A. KRAEMER.
LEONARD E. FINCI-I.
appearances cramp The following references are of record in the file of this patent:
UNITED STATES PATENTS