US1755790A - Hot-air-furnace attachment - Google Patents

Description

April 22, 1930. E. R. NEVEL 1,755,790

HOT AIR FURNACE ATTACHMENT Filed Dec. 29, 1928 2 Sheets-Sheet l I 7 .1

April 22, 1930. E. R. NEVEL 1,755,790

HOT AIR FURNACE ATTACHMENT Filed Dc. 29, 1928 2 Sheets-Sheet 2 pmwvm Inventor Elmer RJI/ve v A itomey Patented Apr. 22, 1930 o ELMER R, NEVEL, or Lo'oK HAvEN, rn'NNsYLvAnIA Hor-AIR F RNAcE ATTACHMENT 'f Applicationfiled December 29, 192s.- Serial No. 329,087.

' Y The present --i nventionrelatestoiimprove I ments'in hot-airfurnaces and has reference ,more particularlytoattachmentslto the'combustion chamber for increasingtheradiating,

surface thereof, g V i c I "Oneof the importantobjects off the present invention is .to provide a hot air furnace attachment'thatincludes a formation of copperfins around the exterior ofithe combus- 10 tion chamber of the hot air furnace, 'saidfins being disposed. inclose proximity with respect to each other to; increase lthe efficiency 1 of the radiating surface of said combustion chamber.

; Another. important io'bject of the invention resides in the provision ,of [a hot air-furnace attachment wherein the;,copper;fins may be cast or spot-welded to the )uter'surface of the cast iron combustion chamber, c 1 j-Still a further object resides in sioniof a hot air furnace attachment that includes a band'thatencircles the major portion of the combustion chamber, and is fixed 5 1y jsecured 'theretoga series of radially disposed fins being operatively connected at their inner ends with the band in such a manner as to prevent .casual disengagement of the finsfrom the band.

I 1 Another object resides in the provision of I a hot air furnace attachment of the above mentioned character that will at all times be positive and efficient in carrying. out, the purposes-forwhich it is designed, the same being furthersimple in construction, inex pensive, strong and durable and further well adapted to the purpose for which it is designed- I. 1 Other objects and advantages of the inven; 7' tion will become apparent from the followi Figure 2 is a fragmentary sectional view the provithrougha portion ofthe combustion chamber I 1 i fins 70f. the hot air furnace, and one of the that jextendsradially therefrom.

F igure 3 is a, sectional view takenapproximately on the line downwardly, o .c I H V I Figure it is an enlarged sectional view through the combustion chamber showing the band encircling said chamber 'and being j I V securedthereto and illustrating the manner said band.

Figure 5 is a sectional View takenapproiri- I V [mately on the line 5-5 of Figure 4.

. Figure 6 is a top plan view-of one of the fins showing the manner in which the same is locked at its inner end behind the band that encircles the combustion chamber, theband P and saidvc'ombustionchamber being shown in section.

F1gure 7 ,1s a detail perspective view of one of the radiating fins showing the tongues before they are bent into locking engagement Y with theinner face of the'band.=

V Figure 8 is a fragmentary perspective view '7 p p a .of the band showing the vertically spaced slots provided therein forreceiving the bendc able tongues of said fins; v v Figure 9'is a view similar to Figure 6 show ing-a modification of thecombustion chamber wherein the outer surface thereof is formedl with an annular channel to accommodate the band,and V, Figure 10v is a sectional viewftakcn approxi- -mately on the line l0f1 0 of Figure 9. V In the drawings with reference more particularly toF igures "1 to 3 inclusive, the numeral l designates therast iron combustion chamber of a hot air furnace A, the casing extends around the furnace structure being o "shown at 2. Extending circumferenti'al'ly around the combustion chamber'l and being formedintegrally therewith are the heat radia ting fins?) that are" formed of copper and each of thesefins is preferably of rectangu- 5 lar formation, the outer ends of the radially disposed. finsterminating in spaced relation with respectflto. the casing as clearly shown .in Figure 1.

The fins 3 are spaced slight distance apart m,

+3 of Fi u 2 QQ -inwhichthe copper. fins extendradially of Y I with respect to each other so as to increase the radiating surface of the combustion chamber. These fins may be cast or spot welded to V the outer surface of the cast iron combustion chamber 1.

With reference now to Figures 4 to 8, inclusive,there is illustrated a'copperband 4: that encircles the combustion chamber '1, the ends of this split band terminating adjacent the respective sides of the usual opening formed in the front side of the fire box 5 of the hot air furnace A. The band iis bolted at spaced intervals to, the combustion cham her 1, as shown at 6, and thein'ner face of the band is spaced with respect to the outer face of the combustion chamber.

' "This copper band isformed at spaced inter vals with a series of vertically spaced slots 7 V tions of the band as moreclearly disclosed in for receiving the bendable tongues 8 that are formed on the inner end ofeaoh rectangular shaped copper heat radiating fin 9, it

being understood of course that the band a is ofa width slightly greater than the height of the radiating fins 9 so as to permit thebolts 6 to pass through the upper and lower edge pore Figure 5.

p the band and the outer face of the combustion chamber 1 and this detail is clearly illus-i trated in Figure 6. 'In this manner the heat l The free ends of the bendable tongues after being disposed through the respective slots? are bent laterally in opposite directions "for engagement with the inner face of radiating fins 9 will be positively anchored in proper position on the outer face of the "circumferentially extending band 4:, and the outer end'of the fins terminate in spaced relation with respect to the circular casing 2.

shown a modification wherein'the outer face i In Figures 9 and 10 of the drawings there is of the combustion chamber 1 is formed with a circumferentially extending channel lO'toac- 'commodate the copper band 4so that the outer face of the copper band will lie substantially flush with the outer contour of the combustion chamber. Otherwise the band is attached to the combustion chamber in the usual manher as referredto above, and the bendable out departing from the spirit of the invention and the scope of the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is 1. The combination with the combustion chamber of ahot'air furnace, of a band encircling said combustion chamber and being spaced therefrom, said band being formed witha series of vertically spaced slots at spaced intervals, a series of vertical radiating fins arranged radially with respect to the spaced intervals, a series of vertical radiating fins arranged radially with respect to the combustion chamber, bendable tongues formed in the inner end-of each-fin for disposition through the respective slots in the band, the free ends of the tongues being bent laterally for engagementlwith the inner face of the band and the outer face of thecombustion "chamber, said band being of a width greater thanrthe height of the fins, and attaching bolts for the band extending through the upper and lower edge portions of the band andthe' combustion chamber.

In testimonywhereof I affix my signature.

ELMER 11.

tongues 8 when engaged with the channeled is portion 10 and the inner face of the band 4:.

7 It will thus be seen from the foregoing description, that I have provided an attachment for hot air furnaces that will increase the radiating surface of the combustion chamber, and my attachment is of such a nature as to permit the same to be installed on the combustion chamber either as an integral part thereof, or as a separate unit, and this with- V out going to much expense. p

' While I have shown the preferred embodimentof my invention it is to be understood that minor changes in the size, shape and ar- 7 rangement of parts may be resorted to with-

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