US499926A - Hot-air furnace - Google Patents

Description

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' C. A. LARSON.

HOT AIR FURNACE. No.499',926. Patented June 20, 1893.

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UNITED STATES .PATENT OFFICE.

CARL AUGUST LARSON, OF SIOUX-CITY, IOWA.

HOT-AI R FU RNAC E.

SPECIFICATION forming part of Letters Patent No. 499,926, dated J' une 20, 1893.

` Application med January 1e, 1893. seria 110.458.577. ou modelo' To @ZZ whom it may concern.-

Beit known that I, CARL AUGUsrLARsoN, a citizen ofthe United States, residing at Sioux City, in the county of Voodbury and State of Iowa, have invented certain new and useful Improvements in Hot-Air Furnaces; and Ido declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference -being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention has reference to hot air furnaces. Its object is to provide a furnace that may be simply and cheaplyconstructed, and which will accomplish most efficient results, and at the same time consume a minimum quantity of fuel. A further Objectis to provide a furnace that will produce a `superior draft and utilize almost the entire product of combustion before the smoke 'passes into 4the chimney. My furnace also provides a construction by means of which the cold air is thoroughly heated before it passes into the dome, whence itl is conducted to the rooms above. These results are attained by a novel arrangement of the smoke fines With reference to the cold air draft and also by a novel construction of the grate with reference to the cold air chamber.

My invention therefore consists in the novel construction, arrangement and combination of the parts, as will be hereinafter fully described and particularly pointed out in the claims.

I have fully and clearly illustrated my invention in the accompanying drawings, wherein like parts are .designated by similar letters of reference, in which- Figure 1. is a front view of my furnace in elevation, incased in brick masonry. Fig. 2 is a side view of the same in elevation. Fig. 3. is a vertical section on the left of the fire box, showing the route of the smoke iiues in the smoke chamber. Fig. 4. is a vertical section through the center of the furnace, showing the cold air shaft, and cold air chamber, and the tubular construction of one of the grate-bars. Fig. 5. isa cross-sectional View, with the dome of the furnace cut away, on line X X Fig. 4, looking down upon smoke flues and grate. Fig. 6. shows a cross sectional view on line X X of Fig. 4, showing the smoke pipe, centrally located and passing through the cold air shaft. Fig. 7 is a sectional view of fire grate showing tubular grate bars and clinker bars and shaft. Fig. 8 is afront view of grate frame showing tubular grate bars.

Referring now to the illustrations in detail: C represents the pipeleading to the chimney, in the usual manner.

l K designates the cold air duct and is located above the cellar oor. C C are hot air pipes leading from the dome M to the rooms to be heated. v

d d designates dampers; S the stove door and box through which the furnace is fed; S the door'and box through which the ashes are removed; H the door through which the hot water pan is lled; A, a door at the bottom through which the furnace is cleaned and which also provides a check draft; S2 the shaker lever and r the shaker rod.

B B represent the mason work surrounding the furnace and support-ing the fire box; B', an open air space between the masonry, by means of which the cold air is excluded and the hot air retained, and all the heat produced utilized without any great effect upon the furnace room.

F designates the tirebrick and F the lire l box; I the iron frame ofthe fire box.

G represents the grate, and G one of the grate bars, which in my furnace is stationary and for the purpose of procuring the better draft should be placed at an angle with the horizontal plane of the furnace.

r fr are clinker bars attached to the shaker rod, and located between the tubular grate bars.

I represents an iron shield which cuts off the cold air chamber K2, from the upper part of the furnace, and is located just above the grate.

P represents a smoke flue passing from right to left on the same plane with pipe P, which leads directly into the chimney, and into which the smoke passes upon leaving the lire box. On either side of the fire box and on the same plane, two parallel 'smoke liues extend from the pipe P toward the front of the furnace. These pipes are provided at ICO their outer ends `with dampers d d, and are intersected at o o bythe upper arms cfltwo V shaped smoke fiues o8 o3, one on either side of furnace, curved at o2 o2, which open below into-a smoke chamber K', closed above and extending from side to'sideon thesamelcvel with the'cold air shaft.

KS is a hot air chamber, into which the tubular grate bars open, closed just below they` grate bars, and extending on both sides of the feed box into the dome, M. e

D represents a largeedamper whichvmay bef made to open or close the pipe P. By this' damper the draft maybe ma'de topassimme-y smcke'iues into' the smoke chamberus `desired. .y Bhdesignates e small `open spa'ce` through# whicha `smalltqnantity of col'dtairmayepass from` thecold air duct, and which also vcontain .1f pipes. o; and o3, whiclrheatthecoldt airbietorefH it reaches the dome. Y N N are the iron frames which support thei re box lupon' the'brick foundation.` VP2z-is ra@ smokepipefleading from the middle ofthe;y smoke chamber K, backthrough thecold-'airi duct:K,vinto the chimney C. y Illhe `operation ofsmylinvention `isaslfollowsrl Whenfthefretis justvstarting and raxstrongg 3o quick draft is desired, damper Disfleftfopeni` and thewsmoke'and; gas pass outnbfthe pipe P into the chimney. Whenagocdfreis cre-,kl atedlandit is desired'to usezthe greatestpos-1A sible quantityof heat, damper D `ishelosedff` The colti `aireuters thefuruacei th rou ghfshaftf K, andfenters coldxairchamberlK?. Here it strikescagainst shieldlf, andiis fcrcedthrough the open ends ofthezgrate bar`s1T, cfthegrate bars G" G', where it is thoroughly heated an1d ser Thisl swift cu rrentof hot ainpasses into cham-E ber `:K-,.aud up into the idomegwhence iti `passesthrough .the "hot air pipes .C' fC eftothei roomsabcvc. ,In the meantime :the smoke and gaseous products pass iuto1pipes.Pf,then]v the `motion of theheat ,greatlyacceleratedd tothefront through Iiues o o, down ,through fiuesosointo the smoke `chamberlKI The smoke, diffusing heat through pipes o and o3, now passes along pipe P through the cold air duct into pipe C andout through the chimney. 5o Pipe P2 becomes heated y.and communicates itsheatto the-fcid-airfinf shaft K. The cold air in K, and the hot air in pipe P, proceed- `ting` in lopposite directions, communicate to each other a greater velocity. The, surplus heat from the smoke and gas, are utilized in .p vheating .thecold ,air-.as vitpzrssesoverppe P2, `tlues o o and c3 o?, and through the grate into the dom-e. diately out the chimney, or down through the `By reference to the construction of my fur- 6o znace it will be.-seenzzthatbut asmall tportion of A itis constructed cftironofrariyakind. .Aside frcmithe rdcors aand llanxesrthe `iron tfrre :1 box, lfines*andgratgfthevfurnacexslmayfheiconstructed en trety :of shriek. ,{Ehistmateiial renders `65 -lithe 41consti-'11ction `Nery lsiniple, durable fand` .'cheap.` i x l wingfthusfullmandrelearlydescrihedmry i inventiomwlratInciaimrasmlewfandiiiesireito `fsecurebyLettersiPateut,sis- `17e il. `:In :a 'hottairitnrmarcwthe!` double furn ace iframe-direboxyandistatioxmryxtubular grate,

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.12. rlinsafhot airifurnaceymith-doubieiframe, Afire ..1box, "dome, :coldrair `shaft a'nd .cold `mir :cham ber,'the.combination ofiues Pf,- o 0,03 013, .s 8c smoke :chamber AfKQ:and@pipesLPfandi (5.; with` 'the tubularrgratelGnpassingffrcm :lacoldiair `LchamberiK?,atoihoteiir31mmberrK?, substantillyffasfspecitied.'

l CARL AUGUST aLASON. "Witnesses:

iL.. S. SBEARSON,

f OscARiMIDDnEKAUEF.

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