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Publication numberUS1178274 A
Publication typeGrant
Publication dateApr 4, 1916
Filing dateNov 29, 1915
Priority dateNov 29, 1915
Publication numberUS 1178274 A, US 1178274A, US-A-1178274, US1178274 A, US1178274A
InventorsLee H Simmons
Original AssigneeSimmons Forced Draft Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Forced-feed furnace-grate.
US 1178274 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



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Patented Apr. 4, 1916.

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Patented Apr. 4, 1916.

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Patented Apr. 4, 1916.

Application filed November 29, 1915. Serial Nd. 64,109.

To allwlzom itmay'concem." w v Be it known that I, LEE HOWARD SIM- MoNs, a-citizen of the United States, and a resident of Wilmin on, county of New Hanover, and State North Carolina, have made and invented certain new and useful Improvements in Forced-Feed Furnace- Grates, of which fication. V p Y My invention relates to a new and useful the following is a speciimprovement in grates and more particuthe larger form of coalmay be also advantageously burned. The bed is. practically solid with the exception of relatively small air spaces or openings, and which openings are so small that little or no fuel will drop therethrough. However to remove any minute ashes or dust that shift through these openings, means are provided for simultaneously clearing the inside 'of each grate bar, so that the bars will not become choked or clogged, which would seriously interferewith the-draft, In a grate of this type, 'it is highly necessary that the forced air draft reach allparts of the grate as the heat on top of the bars is very high and the grate bars are no thicker than absolutely necessary, therefore a manifold is provided wherein the air is admitted cen-.

trally to all of the grate bars, and is so bafiled that the air is as nearly as possible equally distributed to all portions of the grate bars.

An object of my invention is to provide a grate consisting of a plurality of grate bars wherein any number of bars may be installed depending on the desired heating area and wherein the bottom of the several as forced draft bars may be dropped simultaneously to clean the same. a Another object of my invention is to provide a grate of the class described wherein n means. are provided for rocking the bottoms of the several. bars although the specific form mentioned forms the subject-matter of a separateapplication, filed of even date herewith. I v

Still another object of my invention is to provide a manifold on which one end of each grate bar rests, and which manifold is provided with a longitudinally extending baffle plate and a pair of anti-clinal walls, so that the forced draft will be as equally distributed as possible to the several grate bars and which. manifold is also an improvement over the form of manifold shown and described in the application before referred to by me.

Still another object of my invention is to provide a grate in which the bars positioned at the side of the grate are of a difl'erent construction than those shown in the central. portion and in which the openings therein are located not only on the top surface thereof, as with the other bars, but also have openings in an inclined surface, so that the forced draft may not only enter below the fire bed but will also shoot or be forced across the surface of the fire to readily mix with the gases of combustion and in this manner assist them to consume a goodly portion of the smoke which would otherwise be emitted from the chimney. In

fact, with the improved construction to be hereinafter described I have found that it is not necessary to provide any additional smoke consumer, as the same is so readily used and the discharge of smoke so small that it will easily comply with any of the strict enforcements in regard to prohibiting dense smoke from chimneys, now in force in many different States.

Still other objects of my invention is to provide a grate of relatively few parts, consisting of a series of hollow grate bars, the bars positioned at the side of the said grate being of a novel form and construction, so

that the air will enter below and at the sides of the fire bed; also to provide a very effective manifold; and means for disposing of the ashes or dust that may sift into the said grate bars.

With these and other objects in view my invention consists in certain new andnovel features of construction and combination of parts, as will be hereinafter more fully described and pointed out in the claims.

Referring to the-accompanying drawings forming a part hereof, and in which like letters of reference denote similar parts, Figure l is a top plan view of my improved form of grate, nace being in section. Fig. 2 is a transverse sectional view of the improved grate and Fig. 3 is a longitudinal sectional view of the same. Fig. 4 is a longitudinal sectional view of one half of the manifold, the

other half beingidentical with that shown.

Fig. 5 is a top plan view of one half of the manifold, the other half being likewise similar and Fig. 6 is a perspective view of the form of grate bars that is positioned at the side of the said grate.

, Referring now to Fig. 1 it will be seenthat the grate is composed or formed of a plurality of grate bars 1 which form a front and rearward series 2 and 3, however the four side grate bars 4:, 5, 6 and 7 are of a different shape and contour, as will be explained as the description proceeds. More bars similar to bars 1 may be added if a greater heating area is desired, the side bars simply being moved over so that they will always be positioned at the sides.

The adjacent ends of the grate bars 1 and the bars l, 5, 6 and 7 rest on a manifold 8, which may be a casting of any sufiicient height and strength. and has provided in its upper surface a plurality of nipples or openings 9 on which fit in holes 10 provided on one end and lower surfaceojf each and every ate bar.

It will be noticed (Fig. 3) that the front series 2 of the grate bars have their forward portions raised or at an inclined angle to the remainder of .the upper surface and the rearward series are simply flat throughout their heating surface, the raised portion assisting in the firing of the same. Each bar of both series is preferably a solid casting and with the exception of the side grate bars 4, 5, 6 and 7 are substantially triangular in cross section, the side walls extending downwardly and inwardly.

The upper surfaces of the grate bars 1 are provided with a plurality of relatively small air passages, the same being only large enough to permit the requisite amount of air to the fire, it being desirable to keep them the outside wallsof the fur-' as small as possible, so as to prevent much dust and ashes from falling through the said opening into the center portion of the grate bars. I

Hinged to the under portion of each bar is a door 11 which is provided with a lug 12 which in turn is connected to a longitudinal shaft 13, which is moved by the arins 14 located on a shaft 15. The peculiar construction however of the manner of beveling the side walls and the construction of the bottom door formsthe subject-matter of a separate application filed on even date herewith. The manifold 8 extends transversely of the said grate bars and is preferably supported in the middle by a suitable form of standard 16, and each end of the said manifold is provided with a plate 19 to which is bolted or otherwise secured the air chute or inlets 21 and 22. The manifold is also provided at each end with a baffle plate 23' which extends over the air chutes and for a short distance longitudinally-of said manifold so that the, air in passing from the fan 2& which is located preferably at the side of the furnace will be distributed not only to the openings nearest the chute but also to the other openings throughout-the length of the manifold. The manifold is also divided transversely by a wall 25 and the lower wall 26 of said manifold is not constructed parallel with the upper surfacabut at an angle thereto, the area of said manifold decreasing .from the ends toward the center thereof.

Formed on each side of said manifold and nearly throughout its length are the wings 27, the under surface of this wing being parallel with the upper surface of the said manifold. and directly beneath the said transverse wall 25 the said wings 27 are enlarged to form. the lugs 28, which are provided with openings 29, so that a bar may be passed therethrough to fasten the same to the aforementioned standard 16.

By constructing this manifold with a decreasing area toward the center and providing abaflle plate at each end over the am opening and a transversewall, an equally distributed supply of air is obtained, which is absolutely necessary, as if any port-ion of the said grates did not receive their requisite amount of air they would soon become burnt out and rendered useless.

Referring now especially to the description of the side bars it will be een thattwo of these are placed on each si e of the assembled grate and that the two forward ones are similar to the two rearward ones, with the exception that their front ends decline toward the center similarly to the other front and rearward series of the grate bars angle to the top surface 30, and is providedbut furthermore a simple means is under surface,

. the

1. These four side bars 4, 5, 6 and 7 are also likewise provided with nipples on their to register with the openings in the manifold. The bars at the left hand of the series however having the nipples disposed at the opposite ends from those of the right hand series. These sidebars are somewhat similar to the bars 1 with theexception that at one side of the top surface there is formed a wall that extends upwardly about eight inches to thereby form a surface or face 31. This wall is set at any desirable with a plurality of small openings 32, similar to the openings in'the' surface 30, also at the top formed another relatively small surface 33 which may be slightly inclined to the surface 31, or may be made parallel with the surface 30 and this surface is also provided with similar openings 34 to protect the same from the heat and to protect the bar should the fire extend to the top of the side wall or. surface 31.- It is not desired however and the top of the fire bed should never extend as high as the top of the inclined wall or surface 31, as the forced air draft should rush through these openings 32 over the top of the fire, mixing with the combustible gases and in this way consume and burn up the black smoke that would ordinarily escape from the chimney. The openings 34 in the extreme top surface also permit the air to mix withthe gases as well as protecting the upper part of the bars from the heat.

By providing an inclined surface 31 at sides of the grate the brick 'walls are greatly protected, as heretofore in many instances it was necessary at short intervals to renew the walls of a furnace directly at the sides of the grate.

From the foregoing it will be seen that the, larger part of the grateportion might be made up of any preferable form of hollow grate bars, and by providing the side bars as constructed and shown herewith, not only will the grate contain derived from the use of hollow grate bars rovided for increasing the combustion direiitly over the fire and greater part of the smoke, and at the same time the side Walls of the furnace are greatly protected. It will be understood that these side bars might be changed in shape slightly, the gist of the idea however being that a surface is provided at an incline to the top surface and through which is allowed a forced draft to enter over the fire, as well as under, and also to have the grate protect the side walls of the furnace. Many slight changes may also be made in of this inclined surface may be all 'the advantageswhich will consume a.

the grate and manifold and in the different bars without departing from the spirit and scope of the invention.

Having thus described my invention what ters Patent is I 1. A grate comprising a plurality of hollow grate bars, said bars provided with inlets and top air outlets, a manifold provided with air inlets at its said manifold provided with air outlets I claim as new and desire to secure by Letregistering with the air inlets in said hollow grate bars, a transverse wall in the center of said manifold and downwardly depending lugs on the said manifold for supporting the same, the cross sectional area of opposite ends, and.

said grate bars provided wall at the center thereof and. means formed beneath the said transverse wall for supporting said manifold, the cross sectional area of'said manifold decreasing from the ends toward the center and means for supplying the said manifold with air.

3. A grate comprising a plurality of hollow grate bars provided with pivotal bottoms and means for rocking simultaneously the said bottoms, a manifold extending transversely of said grate bars for supplying air to the same and supporting the inner adjacent ends thereof, grate bars at the side of said grate having a pivotal bottom and inclined surfaces above the level of the fire bed, and provided with openings to distribute air above the said fire bed, the transverse area of the walls of said side bars being substantially the same.

4. A grate comprising a plurality of hollow intermediate grate bars, having air inlets and outlets, hollow side bars, having air inlets, said intermediate and side grate bars provided with pivotal bottoms, and means for rocking simultaneously the bottoms of said intermediate and said side grate bars, a manifold extending transversely of all of said grate bars for supplying air to the same and supporting the inner adjacent ends thereof, the said side bars extending above the level of the fire bed and provided with openings to distribute air above the said fire bed.

5. A grate comprising a plurality of hollow intermediate grate bars having air inlets and top air outlets, a plurality of hollow side bars also provided with air inlets, said 7 above said fire bed and the air space of said side bars being relatively greater than the air space of said intermediate bars.

Signed at Goldsboro and State of North 15 Carolina, this 16th day of November, A. D. 1915.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4414904 *Dec 2, 1981Nov 15, 1983Foster Glenn MWaste-burning furnace
U.S. Classification110/300
Cooperative ClassificationF23H3/02