Untitled record

Application filed February 12,1889. Serial No, 299,564. (No model.)

To all whom it may concern:

Be it known that I, Edward P. Johnston, a citizen of the United States, residing at Washington, in the District of Columbia, have 5 invented new and useful Improvements in Heating-Drums, of which the following is a specification.

This invention relates to heating-drums; and it has for its object to provide a device of this io class adapted to be used in connection with any stove, furnace, or other heating apparatus, and which shall be provided with convoluted passages for the transmission, respectively, of the products of combustion and a 15 current of air, which latt er shall thus be heated.

The invention consists in the improved construction and arrangement of parts to be hereinafter described, by means of which heatingsurfaces of relatively large extent shall be pro20 duced within a comparatively limited space, whereby a large percentage of the heat generated may be utilized, as will be hereinafter fully explained with reference to the drawings, in which—

Figure 1 is a vertical sectional view of a heating-drum embodying my improvements. Fig. 2 is a vertical section taken on the line x x of Fig. 1. Fig. 3 is a horizontal sectional view.

The same letters refer to the same parts in all the figures.

A designates the shell or casing of the drum, which may be square or rectangular in crosssection, and the opposite sides of which B B 35 are connected by means of a corrugated metallic sheet or plate C, which extends longitudinally through the casing, and the corrugations of which are of considerable depth, so as to form a series of chambers D and E, the open40 ings of which face in opposite directions. The edges of the corrugated plate 0 are to be secured to the sides B of the casing in such a manner as to form a perfectly-tight joint. The opposite sides of the casing F and G are each 45 provided with a series of horizontal inwardlyprojecting deflectors or plates F' G', extending into the chambers or compartments D and E, formed by the corrugated plate, but terminating at some distance from the inner ends 50 of the said chambers, as will be clearly seen in Fig. 1 of the drawings. The deflectors may be sustained in position by supports g? g², as shown. The edges of the plates F' G' extend entirely to the sides B B of the casing, so as to cause the smoke and air to be deflected 55 when passing through the casing, as will be presentlydescribed. ThesideGof the casing A, which is adjacent to the channel through which the products of combustion pass, is provided with a central longitudinal slide or 60 hinged section G³, Fig. 3, which may be opened or removed, in order that accumulations of soot or other obstructions may be readily removed from the interior of the casing whenever it shall be necessary. 65

It will be seen that the casing A is divided longitudinally by the corrugated plate C into two separate chambers or compartments II and I, each subdivided into the horizontal chambers D and E, into which the horizontal 70 plates or deflectors extend from the opposite sides F G of the casing. The upper and lower ends of the casing are provided with suitable heads, both of which communicate with the longitudinal passage I. These heads, which 75 are designated by letter J, are preferably provided with cylindrical collars K, by means of which the device may be connected with stovepipe of ordinary construction. The ends of the longitudinal passage II are left open for 80 the passage of a current of air.

To afford greater heating-surface and improve the appearance of the casing A, it may be, and is preferably, inclosed within an outer cylindrical shell or casing L, provided with 85 perforated ends, either cone-shaped or horizontal, one or both of which ends should be detachable or pivoted at one edge, in order that the cylindrical casing L may be temporarily removed when it is desired to relieve 90 the dru m A of soot or other obstruction. The casing L is supported in its normal position by a number of projections extending inwardly and resting upon the casing of the drum A; or it may be attached in any other 95 convenient manner. The casing L is not, however, necessary or essential to the successful

I operation of the drum A.

The operation and advantages of my invention xvill be readily understood from the fore- 100 going description, taken in connection with the drawings hereto annexed. When the de428,756 vice is adjusted in its proper position, the products of combustion entering at one end of the casing will pass through the longitudinal passage I, the plates or deflectors G' serving 5 to force the said products of combustion to follow the convolutions of the corrugated plate C and to pass entirely through each of the sub-chambers E, formed by the said corrugated plate. At the same time the current of ic air entering at the opposite side of the casing will be caused by the deflectors F' to follow the convolutions of the corrugated plate C, thus subjecting tlie current of air to direct contact with the entire heated surface of the 15 said corrugated plate C, whereby the temperature of the said air-current is gradually raised, so as to approximate to that of the products of combustion passing through thecasing on the opposite side of the corrugated plate.

so The general construction and arrangement of parts composing the device are, as will bo seen, very simple, and by making the casing of a proper length a large percentage of the heat of tlie products of combustion may be 25 utilized.

The device may easily be cleaned by opening the swinging door or section of the side G of tlie drum or easing, and it may be readily attached to an ordinary stove-pipe in position 30 for operation, it being obvious that the products of combustion may be caused to enter either at the upper or the lower end of the casing, as may be preferred.