US749059A - And wilfeed w - Google Patents

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US749059A US749059DA US749059A US 749059 A US749059 A US 749059A US 749059D A US749059D A US 749059DA US 749059 A US749059 A US 749059A
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    • F24B5/00Combustion-air or flue-gas circulation in or around stoves or ranges
    • F24B5/02Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves
    • F24B5/021Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves combustion-air circulation
    • F24B5/026Supply of primary and secondary air for combustion


. UNITED STATES Patented January 5, 1904.
SPECIFICATION formingpart of Letters Patent to. 749,059, dated January 5, 1904.
Application filed March 5, 1902.
To aZZ whom it may concern.-
Be it known that we,OHRIsTIAN D. HELWIG, a resident of Kansas City, in the county of Wyandotte and State of Kansas, and WIL- FRED W. MONTAGUE, a resident of San Francisco, county of San Francisco, and State of California, have invented a new and useful Improvementin Stoves; and we do hereby declare the following to be a full, clear, and exact description thereof.
Our invention relates to stoves adapted for ordinary domestic purposes; and its object is to provide an improved hot blast for such stoves whereby the draft-air is heated before being admitted to the fuel-chamber and more perfect combustion thereby insured.
In the accompanying drawings, Figure 1 is a vertical section of one form of stove, showing our invention applied thereto. Fig. 2 is a horizontal section of the same on the line 2 2, Fig. l; and Fig. 3 is a vertical sectional view, of the fire-pot.
Our invention may be adapted toany ordinary stove for domestic purposes, such as heating-stoves, cooking-stoves, ranges, and the like. It is illustrated in connection with a special form of heating-stove adapted for burning both coal and wood; but it will be understood that this is for purpose of illuso tration merely.
As shown in the drawings, the stove is provided with the usual outside casing 1, supported upon legs, as is the custom, and pro vided with the outlet 2, to which is connected the smoke-pipe 3. In the casing 1 is formed the fuel-chamber 4, which may be of any desired shape and location, depending upon the particular kind of stove to which the invention is applied. Said fuel-chamber is shown located comparatively lowdown in the stove and adapted to burn wood, which is to be placed directly upon the floor of said chamber. To adapt this stove for burning coal, any suitable fire-pot,'such as shown at 5, is
suspended in this fuel-chamber. A door 6 is provided, through which the ashes can be removed; but this door preferably should fit so closely as to practically seal the f uel-chamber and prevent the admission of air. The
fuel may beintroduced into the fuel-chamber through any suitable opening, and we haveand just above the bottom thereof.
Serial No. 96,814. (No model.)
shown for this purpose a door 7 in the top of the stove. On each side of the fuel-chamber, betweem the same and the outside casing, are the doWntake-flues 9, which communicate with the cross-flue 10 at the front of the stove This cross-flue in turn communicates with the central draft-flue 11, which is separated on each side from the downtake-flues 9 by the walls or partitions 12. This central draft-flue communicates with the uptake-flue 13, located at the rear of the stove and leading to the outlet 2. An opening 14 is made in the partition 15, which forms the rear wall of the combustionchamber near the top of said partition, and this may be controlled by any suitable damper, such as shown at 16. When this damper is opened, as it will be when starting the fire, the draft is directly from the combustionchamber to the outlet 2; but after the fire is well started this dam per will be closed, and then the products of combustion will pass into the downtake-flues 9 and thence to the cross-flue 10 and back through the central draft-flue 11 to the uptake-flue 13. This or similar arrangements of dues are common in all domestic stoves, the object being to give the products of combustion such a circuitous path in the stove as to give up most of the heat before passing'to the pipe. A door 17 communicates with the cross-flue 10 and central draft-fiue 11, so that these flues can be cleaned. A valve 18, preferably located in the} front of the stove, communicates with a short due 19, which projects upwardly in the combustion-chamber, so as to admit air, heat it, and discharge it into the, upper portion'thereof in order to aid combustion.
All of the doors and valves leading into the stove will preferably fit so close as to practically seal the same, and said doors will be used only for the purposes for which they are intended-namely, to allow the introduction of fuel or the removal of ashes orsoot; but during the normal working of the stove they will be kept closed. The draft-air to the fuel will be introduced entirely through a pipe located in the uptake-flue 13. This pipe is shown at 20, and it has its lower end communicating with the fuel-chamber 4, near the bottom thereof,
and preferably through a perforated plate 21,
so as to prevent the entrance of ashes and fuel into said pipe 20. The upper end of this pipe is in close proximity with the outlet 2 and comfirst admitted near the outlet 2, practically at the point where the residual heat is about to be wasted, and as the air is coldest at this point it will absorb the most of this residual municates with the outside air, as shown, and"h'e'at, and as the air passes down in the pipe is controlled by any suitable damper or valve, such as shown at 22, which has a screwthreaded stem passing through the cross-bar 23, so that said valve can be opened and closed by merely turning the same. Any other form of damper, however, may be used.
When the stove is in normal operation, the
20 it absorbs less and less heat from the waste products in the flue 13 untilit is brought approximately to the temperature of these waste products, in that way not interfering in any way with the natural heating efiect to be given by the stove.
As heretofore stated, our invention can be draft-air is introduced through this pipe 20, applied to any form of domestic stove, as in and as said pipe extends for a considerable distance through the uptake-flue l3the air will be heated before it is admitted to the fuel-chamber, and the combustion of the fuel will be much more perfect than ifcold air were admitted. This draft-flue, furthermore, opens into the fuel-chamber, near the bottom thereof, or, if a fire pot or grate is used, below the grate, so that the hot air will be applied directly at the point of combustion of the fuel. The heating of the draft-air by this arrangement is accomplished practically by the waste heat from the stove, for the reason that the heat remaining in the waste products by the time the latter enters the uptake-flue 13 has been given off to just the full extent that it can be given ofi, and what further heat remains in such products will merely pass to the pipe and be wasted. By our arrangement, however, this residium of heat will be absorbed by the draft-air and is returned by the same to the fuel-chamber. This heat is therefore saved, the draft-air heated, so as to make the combustion much more perfect, and this is done without chilling any part of the stove, which is used either to radiate heat into the room or to an oven or otherwise.
We are aware that it is not new to provide ahot blast fordomestic stoves; but in all prior devices of this kind the hot blast has been either introduced above the fuel-line or else the blast-air pipes have been so located in the stove that the colt) air coming through the same will chill some part of the stove, which should be maintained at the higher temperature. With our arrangement the cold air is almost all stoves it is the practice to have an of the stove, through which the waste products pass just before going to the pipe, and in all cases my draft-pipe will be located in this flue.
The particular grate or pot shown for the coal is provided at its bottom with the usual openings 24, as is common with coal-grates; but its side walls are also perforated and preferably by the elongated vertical slots 25, as shown. It has been found that the combustion of the coal is much more perfect with this form of fire-pot, as the air is admitted not only underneath but also on all sides of the coal. This fire-pot, however, is not claimed in this application.
What we claim as our invention, and desire to secure by Letters Patent, is
In a stove, a casing, a fire-box having its rear and side walls spaced from said casing, the side spaces communicating with the firebox and forming diving flues and the rear spaces forming the uptake, and an air-feeding pipe located in the rear space and havoutlet in the lower portion of the tire-box.
In testimony whereof we, the said CHRIS- TIAN D. HELWIG and WILFRED W. MON- TAGUE, have hereunto set our hands.
ing an inlet near the top of the stove and an uptake-flue, such as shown at 13, at the rear A
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428183A (en) * 1947-09-30 Combined space heater and cook
US4265215A (en) * 1979-06-12 1981-05-05 Earle Curry Space heater
US4922889A (en) * 1987-09-29 1990-05-08 Thermic, Inc. Pelletized fuel burning heater
US20150159879A1 (en) * 2012-04-23 2015-06-11 Hongfeng Zhu Biomass fuel oven

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428183A (en) * 1947-09-30 Combined space heater and cook
US4265215A (en) * 1979-06-12 1981-05-05 Earle Curry Space heater
US4922889A (en) * 1987-09-29 1990-05-08 Thermic, Inc. Pelletized fuel burning heater
US20150159879A1 (en) * 2012-04-23 2015-06-11 Hongfeng Zhu Biomass fuel oven

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