US1754237A - Furnace - Google Patents

Description

'April 15, 1930. HfB. mmm 1,754,237

FURNACE Filed Sept. 22, 1928 2 Sheets-Sheet l l ...ifi W April 15, 1930. H. B. MARKHAM 1,754,237

FURNACE N Filed sept. 22, 1928 2 sheets-sheet 2 /4 fro/Q A/E/ Patented Apr. 15, 1930 UNITED STATES BARBIE B. MARKHAM, OF ESCANABA, MICHIGAN FURNACE Application filed September 22, 1928.

My invention relates to improvements in warm air furnaces and relates more particularly to a novel blower attachment therefor for forcing the warm air through the heating pipes whereby a furnace which is ordinarily a poor heater can be made to function with entire satisfaction.

Briefly stated, the invention has for its primary object the provision of a novel blower attachment for furnaces which is very simple in construction, highly efficient in practical use and which can be readily installed upon all types of hot air furnaces without the exercise of unusual skill and without substantial modification of the furnace.

A further object of the invention resides in the provision of a device of this kind having novel supporting and mounting means whereby it may be applied to the hood of the furnace and rendered effective for use without necessitating the disconnection of all of the furnace pipes from the hood.

A further object of the invention resides in the provision of an attachment, as characterized, which will eifectually prevent cross currents within the hood and which is adapted for use in connection with a furnace having many or few hot air pipes leading from the hood.

Another object of the invention is to provide an attachment, as stated, which maybe used for circulating cool air through the dwelling in hot weather.

The invention also resides in certain novel features of construction, combination and arrangement of the various parts and in modes of operation to be hereinafter described and claimed,reference being had to the accompanying drawings which illustrate what is now regarded as a preferred form of the invention. It is to be understood, however, that the invention is capable of other mechanical expressions and I therefore reserve the right to make such changes and modifications in the illustrated form of the invention as fairly fall within the spirit and .scope of the subject matter claimed thereinafter.

In the drawings, wherein the saine reference characters have been used to designate the same parts in all views,

Serial No. 307,671.

Figure 1, is a view partly in elevation and partly sectioned and broken away, showing the application of the invention to the hood of a conventional hot air furnace;

Figure 2 is an enlarged vertical sectional view through the hood of the furnace and showing the fan, its mounting and drive means,-the motor being deleted;

Figure 3 is a group perspective view of the motor and its supporting plate with the depending casing which is adapted to be supported by the aforementioned plate within the hood of the furnace;

Referring specifically to the drawings, 1 designates the furnace having the fire box 2 communicating with the smoke pipe 3, which is provided with a damper 4 and an outlet 5 for connection with the chimney. The hood portion 6 of the furnace is shown as located above the fire box and smoke pipe. From this hood 6 lead the hot air pipes 7,-the latter being connected to the hood in the usual, or in any preferred manner. The heated air passes up through the space around the fire box 2,-such space being designated as 6%- and nally to the hood, as indicated by the arrows in Figure 1.

Coming now to the attachment which is the subject of my invention the same comprises a relatively flat conical plate 9, which is adapted to be supported by the conical top portion 6b of the hood 6,-there being, as shown,-a hole 8 cut in the hood top 61. The plate 9 is of greater diameterthan the hole 8 and is thus supported by the hood top 6b, as shown. Plate 9 is preferably bolted to hood top 6b, as indicated at 10.

The motor 12 is vertically disposed and is supported by legs or braces 11 having their lower ends bolted, as at 11a, to the conical base plate 9. The projecting armature-shaft portion 13 is received in the socketed end 14a of the fan supporting drive shaft 14, the elements 13, 14":l being held against relative rotation by the key 13a extending through shaft 13 and end slots 14b in socket member 14. Of course, socket member 14a may be separably and ixedly secured to shaft 14 without the exercise of invention.

The drive shaft 14 extends through a tubular standard 15 having a conical base 16 bolted to the plate 9, as indicated at 16a. The drive shaft 14 extends through the apex of the plate 9 and carries therebelow the horizontally disposed suction fan 17, as indicated,-this fan being disposed in a circular casing 18 having a bottom inlet opening 19. The casing 18 has an inturned marginal flange at its top, as indicated at 18b in Figure 2,-bolts 18a being employed for bolting the casing 18 to the plate 9 as shown. Y

The casing 18 has in its side wall a circumferential series of outlet holes 2O communicating with necks 21 for the attachment of pipe sections 22 which are adapted to project into the respective hot air supply pipes 7, as indicated in Figure 1. Any suitable means may be availed of for attaching the pipesections 22 for communication with'the opening 2() in the casing 18.

It will be apparent that the fan 17 and its shaft 14 are rotatably supported bythe engagement of the socket section shoulder with the end of the tubular standard 15.

Vherethe attachment is applied to a furnace having fewer hot air pipes 7 than the number of holes 2O in the casing 18,-disllike closures 20a are provided for sealing the unused openings 20,-it being understood that only such openings 20 will be used las are opposite the inlets of the hot air pipes 7. In this way there will be no'wastage of hot air. In order to protect the motor 12 from the heat of the furnace, I provide7 preferably, three sheets or plies of asbestos 23 (F igure 1) which are suitably supported beneath the motor 12 by its outwardly diverging supporting legs 11. As a further protection to the motor, I fill the recess of the inverted conica-l hood top 6" with a quantity of sand 24 (Fig. 1). This, of course, covers plate V16 to a depth of five inches or more, but as will be evident shaft 14 is fully protected from such sand by tube 15.

In order to keep the moving parts lubricated an oil reservoir 26 has a suitable motorcarried bracket mounting 26a for disposing it above the motor. From reservoir 26 pipes 27, 28, 29 lead, respectively, to the interior of tube 15 and the adjacent and remote armature shaft bearings of the motor 12, tubular Vcasing 15 has a bronze bearing bushing 30 adjacent its lower end for shaft 14, as indicated in Figure 2.

The operation of the device and the advantages thereof will doubtless be readily under stood and appreciated by those skilled in the art from the foregoing description taken in connection with the accompanying drawings. It will be noted that the diameter of the hole 8 is sufficient to permit the casing 18 to be lowered into the hood. The suction fan 17 draws the'hot air from the space (ia into the casing 18 through the bottom hole 19 and as will be readily apparent, discharges the air out through the holes 20 and pipe sections 22 into the hot air supply pipes 7 through which the same conducted to the registers.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A hot air furnace having a warm air connecting hood at the top and supply pipes communicating with said hood, a suction fan attachment comprising a base plate, said hood top having a hole adapted to be closed by said base plate and to form a continuation Vof the top of said hood, a fan rotatably journalled in said base plate and projecting from the lower face of said base plate, a casing carried by said base plate and projecting into said hood, said casing having abottom inlet and a plurality of side wall outlets and serving as a housing for inclosing said fan, means for rotating said fan, and pipe sections adapted to be connected to the respective outlets of said casing for communication with the respective heating pipes. v

2. A hot air furnace hood having a cent-ral opening in its top wall, an attachment con prising a closure plate for saidopening formino a continuation of said top wall, a casing carried by said closure plate and projecting from the under surface thereof, the size of Said casing being such that it maybe introduced into said hood through said hole, a fan having a shaft extending through said plate and into said casing, bearing means forsaid fan shaft carried by said plate, said casing having a hot air inlet and a plurality of hot air outlets, and means for establishing direct positive communication between said casing outlets and the respective hot air pipes where by a blast of air can be forced thereinto.

3. A hot air furnace hood having a central hole in its top wall, a closure plate for said hole forming a continuation of said top wall, a casing carried by the under surface of said closure plate and projecting into said hood, the hood having hot air pipes communicating therewith, a suction fan in said casing, the casing having an inlet for hot air and a plurality of outlets, a shaft for said fan and extending transversely through said closure plate, bearing means for said shaft supported by said closure plate, said fan shaft having a head enlargement adapted to be supported by said bearing means and said casing forming an inclosure for said fan, a motor, means carried by said base plate and including said bearing means for supporting said motor thereabove, said motor having an armature shaft and a driving connection between armature shaft and said fan shaft head, and means for establishing direct and positive communication between said casing outlets and said hot air supply pipes.

4. An attachment for hot air furnaces comprising a base plate, a casing carried by the under-surface of said base plate, said casingl having an inlet and a plurality of side wall outlets, a suction fan inclosed in said casing alined with said outlets, said fan having a shaft extending through said plate, a bearing carried by said plate and through which said shaft extends, said shaft having a head enlargement at one end for overlying said bearing end to support the fan, brackets carried by said plate and rising therefrom, said brackets converging toward their upper ends, a motor supported in part by said brackets and in part by said bearing, said motor having an armature shaft, and a supporting and ydriving connection between said armature shaft and the head enlargement of said fan shaft.

5. A hot air furnace hood having a top hole therein, a forced hot air discharge attachment including a fan-enclosing inlet casing having outlets and being insertible into the furnace hood through said hole, a supporting plate for said casing and overlying said hood wall about said hole and forming a continuation of such wall, a fan shaft extending through said plate and into said casing and having a fan, an upstanding bearing rising from said supporting plate and through which said fan shaft extends, the shaft and bearing having cooperating means to rotatably support the shaft against dropping into the furnace, supports carried by said plate and surrounding said bearing, a motor ldetachably carried by said supports and adriving connection between said motor and said shaft.

6. A hot air furnace hood having a top hole therein, a forced hot air discharge attachment including a fan insertible into the furnace hood through said hole, a supporting plate overlying said hood wall about said hole and forming a continuation of such wall, a fan shaft extending through said plate, an upstanding bearing rising from said supporting plate and through which said fan shaft extends, the shaft and bearing having cooperating means to rotatably support the shaft against dropping into the furnace, supports carried by said plate and surrounding said bearing, a motor detachably carried by said supports and a driving connection between said motor and said shaft.

7. A hot air furnace hood having a top hole therein, a forced hot air discharge attachment including a fan insertible into the furnace hood through said hole, a supporting plate overlying said hood wall about said hole and forming a continuation of such wall, a fan shaft extending through said plate, an upstanding bearing rising from said supporting plate and through which said fan shaft extends, the shaft and bearing having cooperating means to rotatably support the shaft against dropping into the furnace, supports carried by said plate and surrounding said bearing, a motor detachably carried by said supports and a driving connection between said motor and said shaft, and an insulation shield carried by said supports between the motor and supporting plate.

8. A hot air furnace hood having a top hole therein, a forced hot air discharge attachment including a fan insertible into the furnace hood through said hole, a supporting plate overlying said hood wall about said hole and forming a continuation of such wall, a fan shaft extending through said plate, an upstanding bearing rising from said supporting plate and through which said fan shaft extends, said bearing having a flanged base secured to said plate to reinforce and increase the heat resistance thereof about the fan shaft, the shaft and bearing having cooperating means to rotatably support the shaft against dropping into the furnace, supports carried by said plate and surrounding said s bearing, a motor detachably carried by said supports and a driving connection between said motor and said shaft.

In testimony whereof I ax my signature.

HARRIE B. MARKHAM.

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