US1200507A - Oven. - Google Patents

Description

J. E. LEONARD.

OVEN.

APPLICATION FILED Nov. 24. 1915.

1,200,507. Patented 0ct10,1916.

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JOSEPH E, LEONARD, OF CEDAR RAPIDS, IOWA.

OVEN.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed November 24, 1915. Serial No. 63,303.

To all whom it may concern Be it known that I, JOSEPH E. LEONARD, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented certain new and useful Improvements in Ovens; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to ovens of the elevated type, and has for its object to improve the construction of such ovens so as to secure a good and uniform distribution of heat around them, and to permit expansion and contraction, where the oven is subject ed to excessive heat, without buckling or unduly straining any part of the oven.

The nature of the invention is fully disclosed in the description and claims following, reference being had to the accompanying drawing, in which- Figure 1 is a front view of an oven embodying the improvements, the front and door being removed. Fig. 2 is a sectional detail taken on a vertical line central to Fig. 1. Fig. 3 is a detail view in perspective, showing the middle joint of the oven bottom.

The oven in general comprises an inner receptacle 1 and an outer casing 2 separated therefrom by a surrounding hot-air space 8, the inner chamber joining the outer one at the back directly, and at the front by a rectangular front-plate 4 secured to the inner chamber and outer casing by special clips 5 at the corners. The construction is necessarily rigid, so that at the bottom of the inner chamber, especially, the more direct heat from the flue 6 would naturally expand and buckle the thin material of said bottom, resulting eventually in permanent set and The improved construction permits this expansion and contraction to take place without such distortion or in ury.

1 The improvement in the oven bottom consists in dividing it in the middle, folding back the edges at 7, and joining them by means of a doubly folded strip 8 interlocle ing with said folded edges. In practice the joint so made is a lit le loose, an the at joining edges of the oven bottom are separated a little, so that expansion of the bot tom may take place without any distortion of the bottom. Proper stiffness of the bottom 1s secured by means of the flange 9, which also forms a part of the connection with the front-plate, in a manner that need not be here described.

Below the bottom of the inner chamber is placed a baflie-plate 10, somewhat shorter from front to back than said inner chamber, so as to allow the heat to pass, and for the same reason separated from the oven bottom, inclined somewhat downwardly in the middle, as shown. This baflie-plate takes the direct heat from the flue below it, and is therefore in practice made of two plates of sheet steel, with an interposed layer of asbestos 11. At the middle the baffle-plate has a V-shaped crimp 12, which serves the double purpose of dividing the flame or heat current from the flue, and carrying it to either side and of supplying a bend in the body of the bafiie-plate which enables it to yield according as the sides of the oven, to which .it is attached, expand or contract. Normally, while the expansion and contraction is of course longitudinal, the middle of the baffle-plate yields up or down. But in the case of excessive expansion or contraction the plate may yield longitudinally as well, the V-shaped crimp allowing for such action, whether the plate be drawn up to its limit against the bottom of the oven, or depressed, as shown, so that the V strikes the outer casing.

Referring more particularly to Fig. 3, it will be seen that the folded slide-strip 8 is held in place by the flanges 9, which may first be bent outwardly to permit the attachment of the strip.

' Having thus described the invention, I claim:

1. An oven having an outer casing and a flue entering it at the bottom, an lnner chamber forming the oven proper, the bottom of said inner chamber being divided and slightly separated over said flue, and the seam so made being closed by a folded slide-strip, whereby the bottom of the oven may expand or contract wlthout buckling.

2. An oven having an outer casing with a {fl e entering it at the b m, an inner from the bottom of the inner chamber, and

provided With a yielding and heat-dividing crimp across said flue.

Copies of this patent may be obtained for five cents each, by addressin In testimony whereof I afiix my signature 1n presence of two Witnesses.

JOSEPH E. LEONARD.

Witnesses:

FBIEDA GRUENSTEIN, J. M. ST. J OHN.

g the Commissioner of Patents.

Washington, D. 0.?

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