US1752168A - Hot-air furnace - Google Patents

Description

March 25, 1930. H. K FLOWERS 1,752,168

HOT A IR FURNACE Filed June 4, 1928 3 Sheets-Sheet 1 H II. FZOWEIJ,

H. K FLOWERS HOT AIR FURNACE March 25, 1930.

Filed Jun 4, 1928 5 Sheets-Sheet 2 March 25, 1930. FLOWERS 1,752,168

HOT AIR FURNACE Filed June 4, 1928 5 Sheets-Sheet 3 amm Patented Mar. 25, 1930 HARRY KINGSLEY FLOWERS, or OAKLAND, onnironivra 1 HOT-AIR FURNACE Application filed June 4,

- This invention relates to a hot air furnace. It is aimed to provide a generally improved construction wherein the maximum heating effect upon the air is realized. Another object is to provide a novel construction wherein the furnace proper is made up of an upper and lower portion, the same being in eccentric relation so that the upper portion extends beyond the lower portion and has passages therethro-ugh for travel of air in addition to travel of air about its exterior, and which portions are subject to the heat of the furnace but arranged out of the path of the flame.

Another object is to provide such a construction as will produce a suction efiect upon incoming or cold air and a novel construction wherein there is an equal distance at all points between the portion of the heating element which heats the air and the 1 outer casing, thus making equal heating of the air possible and very economical.

Additional objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings Figure l is a substantially vertical sec- 3 tional view taken longitudinally through the firebox and ashpit doors;

Figure v2 is a substantially central vertical sectional view taken at a right angle to Figure 1;

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure 1; and

Figure 4 is a horizontal sectional View taken on the line 4-4 of Figure 1 looking upwardly in the direction of the arrows.

Referring specifically to the drawings, 10 designates an outer casing from the top of which'heated air is led to the'point or-points of distribution, the cold air being received into the casing as through a duct 11 at the 5 bottom and preferably at the rear thereof. The furnace proper 12 is located within the drum or casing 10, being spaced from the walls thereof and made up of a lower section 13 and an upper section 14 superposed on the 50 lower section and Welded or otherwise fas- 1923. Serial in), 2 2, 20.

tened theretoat a horizontal wall orbase 15. The firepot 16" is located within the heating element 12, extending above and below the wall 15 and thus into both of the sections 13 and 14. The fire'pot preferably hasfla sectional back wall and such firepot is provided with a suitable number of air blast openings 17 which assist in combustion. A convention} al grate 18 is provided for the firepot and an ashpit or space 19 arranged beneath the same. Access tothe ashpitis had through a passageway 20 closed by a conventional ashpit door 21. Access is had to the firebox through a passageway 22 closed by a conventional fire; box or fuel door 23. The productsof com bustion escape through a down flue 24 con? municating with the interior of the drum or section 14 and communicated with an outlet flue 25 extending through the wall of the casinglO. It will be noted-that the sections 13 and 14 of the heating unit are in eccentric relation and that the latter is larger than the former and thus accommodates the arrangement of a plurality of air ducts or tubes 26in communication with the air space between the heating unit 12 and the casing 10, such ducts 26 being welded or otherwise fastened to the wall 15 outwardly of the section 13 and to the top wall of the section 14. r so As a result of the construction described, f the tubes or ducts 26 greatly increase the radiating surface of the heating element or furnace proper and do not retard the free circulation of air around the heating unit and through such duots, part of the air passing through the inlet 11 between the casing 10 and section 13 and part of it then between the section 14 and casing 10 land the balance throughthe ducts 26. Such passage of the air has a suction efiect on incoming air. It will be noted that the section 14 is concentric with respect to the casing 10 and thus substantially full heating of all air passing around the section 14 or through the ducts 26 5 thereof results.

The present invention in particular is an improvement upon that type of hot air furnace which has a radiator extended on the back of the furnace and which is known to possess various disadvantages, such as the fact that the radiator must be arranged as close to the floor as possible, is bulky and cumbersome, cannot heat equally completely around the furnace and has materially less radiating surface than thepresent invention.

Various changes may be resorted to provided they fall'within the spirit and scope of V the invention.

I claim as my invention: A furnace of the class described comprising a casing, a heating unit within the casing V in spaced relation to the side wall thereof,

' said heating unit having a lower section eccentric with respect to the casing and an up per section on said lower section eccentric with respect to the first mentioned section and concentric with respect to the casing,

said upper section being closed at the top and having a base wall, a firepot disposed partly above and below said wall and thus in both sections, said firepot at the upper edge having an outwardly extending marginal portion, air blast openings in said marginal portion, air ducts through the upper section having their entrances outwardlyof the lower section and their exits in communication with the casing above said top, the lower portion of the first mentioned section constituting an ashpit, a duct providing communication through the casing with said ashpit, means 7 providing a fuel supply passage through the casing and upper section communicating with the latter above the firepot, and a flue from the upper section through the casing having a down portion and an outlet portion, said down portion being open at the top adjacent said top.

HARRY KINGSLEY FLOWERS.

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