USRE11623E - Downdraft stove or furnace - Google Patents

Description

{Rei-'med July 1 897.

. .To a/ZZ whom, it may concern:

' Stoves dr Furnaces, of which the following vTO ` or furnaces which have for their object the .tained unless the downdraftfpassage does UNITED STATES PATENT OFFICE.

EDVIN DEVIIURST MCLEAN, OF MARISSA, ILLINOIS.

D-OWNDRAFT STOVE OR FURNACE.

i SPECIFICATION forming part of Reissued Letters Patent No. 11,623, dated July 27, 1897. Original No. 574,210, dated December 29,1896. Application for reissue filed April 22,1897. SerialNo. 633,411.

Be it known that I, EDWIN DEWHURST MCLEAN, a citizen of the United States, residing at Marissa, in the county of St. Clair and State of Illinois, have invented a certain new and useful Improvement in Downdraft is a full, clear, and exact description, reference being had to the accompanying drawing, forming apart of this specification.

My inven-tion relates-to that class of stoves heating of buildings; audit consists of the combination and arrangement of certain elements whereby a downdraft stove or furnace is provided in which either anthracite or bitumihous coal may be fed, and which is adapted to beused both for direct radiation of heat and as a hot-air furnace, as Awill be more fully described hereinafter.

Referring to the drawing, the figure represents a vertical section al view taken centrally. In the drawing, l designates the base of the stove or furnace; 2 2, respectively; the basket and shaker grates 5, the combustionchamber, and 6 the fire-chamber.

8 is a magazine suspended from the top of the stove.

9 designates an upd1aftpassage 'leading from the lower portion of the stove to theupper portion, Where it is adapted to discharge into the 'ue or stove-pipe leading to the chimney. 1 v

10 designates an auxiliary downdraft-passage which leads from an exit-opening 11 in the casing2 at the upper end-of the fire-chamber downward and into the combustion-chamber 5, immediately beneath the grates 3 and 4. By this arrangement of the auxiliary downdraft-passage 10 the gases and smoke arising from...the burning fuel 4in the firechamber are conducted into the combustionchamber 5 into close contact with thegrates, and the fire takes up such gases and thoroughly consumes them and consumes the cai bon in thc smoke, a result that cannot be obopen into the combustion-cl:amber close to the nre-grate. y

Inconstructing my furnace I preferably make the casing of pressed stoel or casi-iron,

"tioned or other metals may suitably be used andthe castings may be of a cylindrical `or* other form. The base l is preferably separable and is provided with short legs. Upon the base .are front, back, and side panels having open-work 12, upon which the flanges 13 of the casing rest. Above the base isv an ashpan 14, arranged to slide upon supports 15, there being an air-space 16 between the base and the bottom of the ash-pan. grate 3, having curved bars 17, is suitably supported about midway between the top and bottom of the case'. The shaking-grate et is supported at, the bottom of the basket-grate. Above the grates,aroun d the tire-chamber, any suitable iron or fire-brick lining for the casing may be used.

18 designates the stove or furnace top provided with a cover 19, located above the magazine 8. Near the top of the casing 2 are perforations 2O te admit air to the fire-chamber, but-in some cases I may use instead a number of adjustable registers to admit air. At any suitable point, preferably at the front, I provide'a door 2l.

Theupdraft-passage is preferably at the rear of the stove orfurnace and communicates with the combustion-ch amber, and over the opening thereto is an apron-like parti- Ation 22, extending from above the opening a rod 24, which may have at its end outside of the ,casing any suitable knob or ring for 'operating the damper. draft-passage 1l) enters the com bustion-chamber above the upper end of the partition 22 immediately below the gratos, as already men- .The auxiliary down- The basket- The two d raf t-passages are supportpnder the various conditions in operation the several .dampers may be advantageously opened or' closed as the circumstances .res quire. The damper 23 may be dropped down, as indicated by the dotted lines, so that when removing ashes all dust will pass up thev iiue lthrough the passage 9i When operated as a downdraft-heater, the chamber 28 should b e j Iopen to permit the gases' or products of comdraft-passage is to carry oi any smoke .or gas bustion tov pass down ward through the pas'- sage 10. As the object of this auxiliary down,-

that mightari'se from theecoal or other ,fuel should the grate become clogged, or from 'any other cause, o r whenoperating as a'dowm draft-furnace, the damper 28 may closethe l passage and the damper 27 closethe; pasmediate graduating lposition desired. v

Such gases 'or smokeas rise ff the fire may pass downl through auxiliary downdraft-pas-V sage and mix with the other products of com- '.bustion in the combustion-chamber below the grate, then o'ut vthrough Uthe updraft 'tothe This'au'xilia'ry downdraft is Ynot influe. p tended at any time when the fire is burning at fullvforce to'I carry -off all the products of combustion, but the object in providing it is topcarry off such gases or vsmoke as may arise at 'anytime or shouldthegrate become stopped up, inwhich case the fire would burn slow land very little gas or s mokearise. VVOne main object of this ldowndraft isto supply thegrate with air in a sufiicient quantity to prevent it frombecomingoverheatedand to supply that air in such a quantity andcondition that the general draft of the stove'or furnace may not be affected, the air passing down between the two heated wallsfthat is to say,` the stove-bodyvon the one side and the partition next to the updraft-passage expands or superheats the air so ythat the eiect on the general downdraft is not aected.

By making suitable connections for hot-air pipes my furnace maybe readily adapted for' heating by this means. The object-of the partition 22 is to divide'the combustion.-

r waves 'downK to the bottoni of the stove or furnace and provide;` a means for retaining and deiiecting the gases that pass down through v the auxiliary draft with the product'of combustion that passes directly through lthe grate. By this apron-like partitionthe gases after mixing are sp'read as they pass under the lower end of said partition-and combustion becomesmore complete, having the saine function' asa bridge-,wall ina boiler-furnace.

I claim as my invention- 1. A heating stove` or furnace, consisting of a base, an ash-pan havingai'r-circulating spaces atbottom and around the back and sides thereof, a casing above said base, a

basket-grate and a shaking-grate supported in said casing,fa {ire-chamber above 'and a combustion-chamber below said grates ar-` ranged to be filled at the top thereof,l a door opening .into said fire-chamber, means-for 7o admitting aii-,into theupper part ofsaid firechamber, an auxiliary downdraftpassage leading from the upper part of saidtire-cham ber to the upper part of said combustionchamber, a'damper hung in said downdraft- 7-5 passagearranged to open and close' said passage, av partition situated below said down- .draft-passage -lowe'r opening extending across said combustionfchamber and to near the bot- Y to'm thereof, a damperhungand arranged to 8o connect thebottom of said partition andldivide said'combustion-chamber into an upper and lower compartment, an upper draft-passagev leading from's'aid lower compartment to the yupper part of said Ifurnace, a communicating passagebetween'said auxiliary passage and 'said updraft-passage nearthe top. thereof,

and a damper arranged ito either close said communicating `passage or said draft-pas'- sage, substantially as and forthe purpose Vocr shown and described. l 'v f l 2. The combination in a stove or furnace,

Aof a casing, a tire-grate within said casing,

a partition located beneath vsaid. lire-grate and Pextending downward to a point near the bottom of the combustion-chamber, a damper closing the yspace between said partition and the casing, .an u'pdraftpassage provided at the rear of the casing and opening into the combustiomchainber back of said-partition, roo and opening-into the rflue, an auxiliary downdraftpassage provided contiguous'to said updraft-passage, a damper in said auxiliary 'IlUwndraftpassagg and adamperin said updraft-passage arranged to eontroleither of :o5 said passages or the opening between said updraft-passage and said auxiliaryv downdraft-pa'ssage, substantially as -andfor the purpose shown and described.' 'A V t 3. The combination ina stove or furnace, no of acasing, a fire-grate within said casing, a partition locatedv beneath said fire-grate and extendin g downward to a'point near th bot- :tom of the vcombustion-chamber, a damper i closing the space between said partition and chamber intotwo parts and to carry the heat-` l `in said passage,an auxiliary downdraft-pasizo. sage provided with an opening into the irechamber above the grate andan opening int-) the'combustionfchamber beneath the grate,y and a damper located in said auxiliary pas- "sage, substantially-as and for thev purpose lshown and described, y

4. The combination in a stove 'or furnacei of a casing, a fire-glatte 'within' said casing, a nre-chamber above said grate,` a combustion-chamber below said grate,` a partitionrgo"4 in said combustion-chamber, an updraft-pas sage provided in connection with said casing andopeningout of said combustion-chamber ut,ion,- substantially as and fori the purpose at the real-of Said partition, and arranged to y shown and described.

openintro a. flue, an auxiliary downdraftw i 1 v passage provided in 'connection with said cas- EDWIN, DE/WHURbT. MCLEAN 5 ,ing and opening out of lsaid fire-chamber and Iupr'esenee' of opening into said eoulbustgion-ehamber'im- "Ei S. KNIGHT, .mediatelybeneath said grate above said par- Y N. FINLEY;

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