US1218594A - Grate-bar. - Google Patents

Description

G. S. CARRICK.

GRATE BAR.

APPLICATION flLED' JULY 6. 1915.

Patented Mar. 6. 1917.

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GRATE-BAR.

Application filed July 6, 1915. Serial No. 38,255.

To all whom it may concern:

Be it known that I, GERALD S. OARRICK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Grate-Bars, of which the following is a specification.

My invention relates to that class of grates in which a forced draft is used, and is designed as an improvement on grates of this class while utilizing the principal features thereof, and is designed to avoid the use of the filler which is sometimes employed intermediate the grate bars. This filler has two objectionable features, primarily that it is very expensive to put in, another that if the grate bars expand, owing to the heat, they are liable to bulge the side walls of the furnace.

My invention has for its object to pro vide an improved form of grate bar which will avoid the necessity of using the filler, and which will permit the bars to expand without doing any damage to the inclosing structure, and while primarily intended to present a tight surface, are so arranged that should they become slightly separated, the shape of the bars would be such as would serve to avoid any deleterious result.

My means of accomplishing the foregoing objectsmay be more readily understood by having reference to' the accompanying drawings which are hereunto annexed and are a part of this specification, in which:

Figure 1 is a fragmentary view of the top of two of my grate bars.

Fig. 2 is a side elevation of the same.

Fig. 3 is a cross section taken on the line w-az in Fig. 1.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, the grate bars are provided with top walls 1, and side walls 2 and 3, the lower portion of which tapers inwardly and terminates in a longitudinal flange 4:. In my bar the vertical portion of the side wall 2, adjacent the top wall 1 is beveled as at 5, while the corresponding portion of the side wall 3, is provided with an angular outwardly extended portion 6, the angle of the lower surface 7 of the angular portion 6, being preferably of lesser degree than the angle of the bev-' eled surface 5.

Specification of Letters Patent.

Patented Mar. 6, 1917.

terious effect upon the fire, inasmuch as the inclined walls will serve to direct the air in an oblique line of travel through the fire, thereby attaining a somewhat similar effect to that produced by the shape of the arcuate slots in the top of the wall 1, shown in the drawings.

The result of this construction is as follows:

l/Vhen the bars are installed in the furnace, they are fitted in so that the point of the angularly extended portion 6, contacts with the point of union of the beveled portion 5, with the surface of the top wall 1, there being a space intermediate the two inclined surfaces and the vertical portion of the walls 2 and 3.

It will be apparent from the foregoing description that when the fire is kindled in the fire-box and the bars expand due to the heat, that the point of the angularly extended portion will slip past the point of union of the beveled portion 5, with the surface of the top wall 1, as indicated by the dotted lines, without doing the slightest damage to the retaining walls of the furnace. At the same time, .it will be' apparent thatthe necessity for the filler between the walls 2 and 3, is entirely obviated and all the trouble and expense connected with this installation is done away with without sacrificing any of the efliciency of the furnace. This also provides a larger cooling surface which lengthens the life of the grate bar, as it keeps them much cooler than can be done when the filler is employed.

Having described my invention what I regard as new, and desire to secure by Letters Patent is:

1. In a forced draft furnace, a plurality of hollow grate bars, having top, end and side walls, the upper portion of one of the side walls, adjacent the top wall, being'beveled, a corresponding portion of the 10 which is inclined.

3. A hollow grate bar for forced draft furnaces, with top, end and side walls, one side wall having an inclined portion adjacent the top wall, the other side wall having an outwardly extended portion, having 15 an inclined lower surface of a different angle than the beveled portion.

In testimony whereof, I have signed the foregoing specification.

GERALD S. CARRIGK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 11.0.

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