US151430A - Improvement in heating-stoves - Google Patents

Improvement in heating-stoves Download PDF


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US151430A US151430DA US151430A US 151430 A US151430 A US 151430A US 151430D A US151430D A US 151430DA US 151430 A US151430 A US 151430A
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    • F24B7/00Stoves, ranges or flue-gas ducts, with additional provisions for convection heating 
    • F24B7/02Stoves, ranges or flue-gas ducts, with additional provisions for convection heating  with external air ducts


Heating Stoves. U 10,151,430, Y Patented May 26,1874.
- F/G, F/G
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UNrTED STATES- PA'rnN'r Orrrcn.
Specification forming part of Letters Patent No. 151,430, dated May 26, 1874; application filed April 8, 1874.
To all whom it may concern:
Be it known that I, DAVID C. PROGTOR, of Peoria, in the county of Peoria andv State of Illinois, have invented a new and useful Improvement in Heating Stoves and Furnaces, of which-the following' is a specification:
The invention herein may be used either as a stove or furnace and the particular features of novelty consist of a scrollshell flue having enlarged annular receiving and exit ends, in combination with an intervening scroll-way in which the folds close the direct draft, whereby a free inlet and outlet is obtained for a passage-way, interrupted at its central line by the varying folds of the inner curved surface between the said openings, and through which interrupted scroll-way the draft is promoted by the termination at both ends of a comparatively small scroll-way into the enlarged annular openings. The second feature of my in vention consists in the combination, with a scroll-shell flue forming a central scroll-exit for the products of combustion, with an inclosing-case forming an air-heating flue, the said combination constituting a double scrollflue-an inner and an outer one-and the two formed by the interior and exterior vertical scroll contour of a single center iiue and the 'outer case, whereby the air passing through said circumferential flue is constantly impingmg against the outer vertically-curving walls of the central flue,and in this way obtain a large heating-surface in an inclosed iiue, while maintaining a free direct draft for the air into and through the flue, receiving at the bottom and discharging at the top into the room, or conveyed in any direction by air-flues.
In the accompanying drawings, Figure 1 represents an elevation of the scroll-due as a heating-stove; Fig. 2, a vertical section of the scroll-shell flue; Fig. 3*, an elevation of the same as a heatingfurnace; and Fig. 4, a top view of the scroll-shell with the top plate removed.
As a heating-stove, the scroll -flue A is mounted upon a f1re-p0t base, so that the central scroll-conduit B forms a continuation of the re-pot chamber, and its upper end is closed bya cap, C, from which the smoke-pipe leads.` The scroll-shell proper is, therefore, open at both ends, and these open ends D tera minate in equal area to the circle formed by the circumference of the winds of the scroll, while the -latter in its cross-section is of much less diameter than the open ends, bringing the passa-ge in effect to 011e side of the axis-line of the shell. This construction gives a free inlet and outlet to the scroll-flue, and preserves the vertically central appearance of the scroll structure. It is cast in two equal parts and secured together in any suitable manner with the central ue B, formed by the scroll-walls, which interrupts the direct draft and retards the passage of the heat by the scroll-surface, which has the eifect of promoting the consumption of the smoke and gases, while practically obtaining a free central draft; and as the exterior contour e is the counterpart oli' the interior d, the radiating-surface must bc greatly increased, especially at the base. It' desired, it may be inclosed in any way that will not prevent radiation, as by cast open or fret work, but this would only be as a skeleton cover for the scroll, and to give symmetry with the base and cap.
As a furnace, the shell-scroll iiue is inclosed by a case, E, which is tted closely over the upper and lower circular ends a b, to form an outer scroll-tine, F, for heating air to be con veyed to different rooms in the-building, the cold air being received at the bottom opening G, and, heated, passes out at the top of the iiue by suitable connecting-pipes H, or into the room by opening c near the top of the case, as shown in Fig. 5, so that a cold and a hot air scroll-flue is thus formed by a single scroll shell flue, and eachhas equal surface for the heat andthe cold air, for the latter, entering at the base, spreads over the entire vertical scroll-walls, and is thereby not only more rapidly but more uniformly heated, while obtaining a free open flue for the rapid circulation of the air to be heated, and holding it under some pressure at the top by the termination of the scroll-walls in the circular rim. The furnace-case is closed by a capplate, I, with suitable exit-pipe openings; the chief design ofthe scroll-due being to obtain from a single shell a central and an outer radiating-surface, whose walls l e stand 'up in scroll form, and thereby, when incased, give ample heatingsurface for a furnace. The innermost folds j' fof the seroll, Fig. 2, are made thicker than the shell, because, as these points intercept the direet line of draft, and thereby receive the more direct impingement of the flame, they are so made to prevent the folds from burning ont at these interior projecting points.
I elainil. The enlarged open ends D, in combination with the intervening.;` shell-flue B, curved substantially as described, to obtain the advantages stated.
2. A shell-flue, A, with inner and outer vertical Walls de of corresponding,` scroll contour,
in combination with the ease E, having inlet and outlet passages G H o for air into and from the outer iue, substantially as and for the purpose described. Y
3. A scrollshell flue having enlarged inlet and outlet openings D D, in combination With the thickened folds f, as described, whereby the direet-draft-interseeting points of the shell are rendered durable.
DAVID C. PROCTOR. Witnesses:
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070186920A1 (en) * 2006-02-15 2007-08-16 Gary Wisener Gravity feed natural draft pellet stove

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070186920A1 (en) * 2006-02-15 2007-08-16 Gary Wisener Gravity feed natural draft pellet stove
US7861707B2 (en) * 2006-02-15 2011-01-04 Gary Wisener Gravity feed natural draft pellet stove

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