US727750A - Furnace. - Google Patents

Furnace. Download PDF


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US727750A US7723301A US1901077233A US727750A US 727750 A US727750 A US 727750A US 7723301 A US7723301 A US 7723301A US 1901077233 A US1901077233 A US 1901077233A US 727750 A US727750 A US 727750A
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Frederick G Cooper
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Frederick G Cooper
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    • F24H3/00Air heaters


'PATENTED MAY'lz, 190s. F. G'. GOOEER;
W itnesses.
No.. 727,'7570f. a PATENTBD MAY 12, 1903.
UNITED STATES Patented May 12, 1903.
SPECIFICATION forming part of Letters Patent No. 727,750, dated May 12, 1903. Application led October 1,1901. Serial No. 77,233. (N0 mOdel.)
To all whom it may concern:
Be it known that 1, FREDERICK G. COOPER, a citizen of the United States, residing at New Haven, in the county of New Haven andState of Connecticut, have invented certain new and useful Improvements in Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.
My invention relates to improvements in furnaces,wliieh improvements can be applied to any form of heating apparatus, whether for commercial or family use, but, as herein described, refer more especially to that type of furnace known as a hot-air furnace.
It is the object of my invention, among other things, to construct a furnace in which the products of combustion after passing from the combustion-chamber are distributed, so as to provide for the'largest possible radiating-surface, and are again subjected to the influence of the heat within the combustion-chamber, by which they'are reheated before passing out through the smoke-flue into the chimney, and to so construct the parts that the direct outlet from the combustionchamber into the smoke-flue shall preferably be in the dome thereof above the feed-door, it being a further object of my invention to use means whereby the device can be readily adapted to any of the various types or forms of furnaces.
To these and other ends my invention consists in the furnace having certain details of construction and combination of parts, as will be hereinafter described, and more particularly pointed out in the claim.
Referring to the drawings, in which like numerals designate like parts in the several iigures, Figure l is a sectional elevation of 'one form of a furnace embodying my invention, and Fig. 2 is a sectional plan View thereof upon line A B of Fig. 1.
In the practice o f my invention I provide the ordinary furnace wi th a plurality of downtakes which open at their upper ends into the combustion-chamber and at their lower ends into a horizontal chamber. A single uptake connects this horizontal chamber with the smoke-nue and passes into the upper portion of the combustion-chamber. The smoke-flue is preferably arranged in the dome of the fur- -ed in any preferred manner,
nace and provided with a damper, whereby a direct passage may be opened from the combustion-chamber to the chimney.
In the drawings the numeral l designates the outer casing or shell of the furnace, having the collars 2 2 thereon for connection with the hot-air pipes. Y Y
Within the interior of the casing 1 is the furnace-body 3, having therein the combustion-chamber 4, grate 5, lining 6, surrounding the fire-pot, and opening into the fire-pot .from the eXteriorof the shell lis the feed- Vpassage 7, closed at its outer end by the feeddoor 8. As all of these parts can be construct- I do not limit myself to the exact construction herein shown and described.
Surrounding the base of the body 3,within the outercasing 1, is the horizontal parti-circular pipe 9, connected with the combustionchamber by a plurality of y downtake-pipes 10, which open into the combustion-chamber at their upper ends, as at 11. The number and size of these downtake-pipes can be varied as desired, it being an advantage of course to provide the vmaximum amount of radiating-surface for the heated gases, which travel in a downward course through these pipes.
Projecting .upwardly from the horizontal pipe 9 is the uptake-"pipe 12, which enters the combustion-chamber near the dome and opens into the smoke-pipe 13, which passes outward through'the outer casing 1 and is connected with the chimney in any manner well known in the art.
Connected with the smoke-pipe 13 and the outer casing 1 is the check-draft pipe 14, which is closed at its outer end by a door 15, of any usual or preferred construction, and mounted within the lower end of the smokepipe 13, so as to open or close the direct passage from the combustion-chamber to the chimney, is the damper 16, which is actuated by the rotatable damper-rod 17. The checkdraft pipe 14 can be omitted, if desired,without affecting the operation of my invention.
As the gases and products of combustion rise from the fire in the fire-pot into the dome of the combustion chamber they escape through the openings 11 into the downtakepipes 10 and enter the horizontal chamber within the pipe 9. While in the downtakes Vand tube 9 the temperature of the gas, &c.,
is lowered by the contact of the cooler air within the outer casing 1 with these pipes. The gases, dac., escape from the pipe 9 into the uptake 12 and enter the smoke-pipe 13 through the horizontal portion of said pipe 12 within the combustion-chamber. The heat within the combustion-chamber reheats the gases Within the horizontal portion of the pipe 12, which increased temperature rarees and lightens these gases, dac., which now move more rapidly and with a much accelerated movement into the smoke-pipe 13 and are immediately replaced by those gases With a lower temperature immediately following, thus increasing the pull or draft through the downtakes from the combustion chamber, irrespective of the normal draft through the ash-pit or grate.
As the direct connection with the smokepipe is in the top of the combustion-chamber, the exit for the gases is in the most convenient place and permits practically all of it to escape when the damper is opened, and if this is done before the feed-door is opened the gases escape into the chimney and do not enter the room through the feed-passage and door, as is common in furnaces at the present time.
It is, of course, readily understood that a direct draft is created in the re-pot by opening the damper when it is desired to start a fire or for other purposes.
With a furnace having my improvements the products of combustion reach the chimney through indirect passages and are reheated, which increases the draft and accelerates their movement through the radiatingpassages, permitting an increased amount of such radiating-surfaces and a longer travel of the heated gases. The location of the smokepipe in the dome of the furnace permits the placing of the direct damper directly over the lire, and as the outlet into the smoke-pipe can be of any size the gas-pressure in the combustion-chamber can be the more readily relieved than when the direct outlet is upon the back of the furnace and on substantially a line with the feed-door, as is usual.
I desire to be understood that the number, shape, orV size of the up and down take tubes or ues and other parts can be varied indefinitely.
4There are minor changes 'and alterations that can be made Within the spirit and scope of my invention aside from those herein shown and suggested, and I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but claim all that falls fairly within the spirit and scope of my invention.
I am aware that furnaces have been heretofore made with an uptake passing directly from the fire-pot and surrounded with coal or other combustible material, and I therefore do not claim such construction, but limit myself to a furnace in which the uptake passes through theA combustion-chamber above the ii re-pot andthe combustible materials therein.
What I claim as new, and desire to secure by Letters Patent, is-
In a furnace, the combination with the combustion-chamber; of a gas-receptive chamber 9 below the said combustion-chamber; a plurality of downtakes l0 opening into said combustion-chamber adjacent to the top thereof and into thesaid gas-receptive chamber at theirlower ends; and an uptake 12 connecting said gas-receptive chamber with the smokeflue, said uptake passing through said combustion-chamber adjacent to the upper end thereof and above the fire-potbefore joining with the smoke-due, all constructed and operating substantially as shown and described.
In testimony whereof I aiix my signature in presence of two witnesses.
US7723301A 1901-10-01 1901-10-01 Furnace. Expired - Lifetime US727750A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590917A (en) * 1983-06-10 1986-05-27 Philipp Kreiss GmbH & Co. Truma-Geratebau Space heater for small rooms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590917A (en) * 1983-06-10 1986-05-27 Philipp Kreiss GmbH & Co. Truma-Geratebau Space heater for small rooms

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