US1591568A - Grate - Google Patents

Description

July 6 G. SIMMONS GRATE Original File ly 6. 1925 Patented July 6, 1926.

UNITED STATES raise PATENT orri cs.

'GORDON'SIMMO NS, OF BALTIMORE, MARYLAND, ASSIGNOR TO ENTERPRISE FUEL COMPANY, OF BALTIMORE, MARYLAND, ACGEPORATION OF MARYLAND.

GRATE.

Application filed .Tu1y'6, 1925, Serial No. 41,645. Renewed April 12', 1928.

This invention relates .to furnace grates and particularly to grates for burning the smaller sizes of anthracite coal, such as buckwheat, rice, and barley and has for its principal object the provision of a grate which can be built into an existing structure primarily intended for burning the larger sizes of anthracite such as'stove, egg, and furnace, without the necessity of fabricating special parts for each job. r

A further object of the present invention is the provision of grate elements that can be assembled on a bar cut from commercial rolled sections and assembled on the existing pins or trunnions of a furnace.

Owing to the steadily increasing cost of the larger sizes of anthracite coal, many endeavors have been made to utilize the smaller sizes of anthracite coal which smaller sizes sell for very much less per ton than the so called household sizes butthe ash ring at the side of ordinary furnaces is so great and the interstices between adjacent fins of usual grates is so great that the smaller sized coals cannot be utilized except occasionally, as for example to sprinkle over a bed of larger sized coal when the fire is to be banked.

It is possible generally to use the smaller sizes'of anthracite coal only by providing a different grate but in order to secure the economy many stoves and furnaces are now being altered so as to be able to burn the smaller sizes. It is obviously a simple matter to take out the existing grate intended for'egg size coal and to replace it with a smaller rice or buckwheat size grate bar if the manufacturer makes both sizes which is not at present the case with any large maker. It is therefore necessary to build up a new grate and the cost of this is absolutely prohibitive unless the grates can be sold in extremely large quantities for each separate make and size.

Utilizing the device of the present inven- 'tion it is possible, and with not an excessive number of different sizes, to load sufficient pieces on a truck and drive to a furnace and without loss of time to assemble a proper grate in the furnace from the standard pieces carried as will be further explained.

In the drawings Figure 1 is a plan view of a round body stove equipped with a grate in accordance with the present invention.

. Figure 2 is a similar view of a square body furnace. Figure 3 is a vertical cross section thru the stove shown in Figure 2.

Figure 4. is a vertical se tion taken along the axis of one of the core pieces or bars.

Figure 5 is an elevation of an end piece.

Figure 6 is a view'of an ordinary type of filler.

Figure 7 is a view of a special'type.

Figure 8 is a view of a type equipped with a downwardly extending lug for attachment to a shaker bar.

Taking the type of stove or furnace shown in Figure l, for example, the large body casting is provided with a number of bearings such as 9, these bearings having been intended to receive the cylindrical lugs of the old larger sized grate bars, such grate bars usually being cast in a single piece. In accordance with the present invention these old grate bars have been taken out and it is desired to fit into the body a grate which will burn the real small sizes of coal. A pair of end pieces is provided for each grate bar, one of these end pieces such as 12 being provided for each bearing place 9 and each having a cylindrical lug '11 corresponding in size, shape, and purpose with the similar members of the old grate bars, these sizes be ing pretty well standard so there is little difficulty in fitting them in place. 7

Each end piece 12 has a rectangular opening 14: therein of such size as to fit a standard, rectangular, wrought iron or rolled steel section or bar- It is often convenient to attach one of the end sections 12 to each bar 10 at the shop and before arriving on the tend to and thru the side bars as shown in Figure 4 and should be keyed to them as by means of the pin 17. I prefer to make these end pieces rather heavy and find that three times the thickness of an ordinary grate element is very satisfactory. I therefore provide a triangular seat 18 in the central portion of the end pieces and of a length to hold .job as the bar must necessarily always ex- 13 have seating portions 30 of the same thickness as the face 19 and having opposing lips 31 whereby they are secured against upward or downward movement on the seat of the end piece 12 altho they can readily be slid sideways into place on the end pieces.

The main portion of each grate bar consists of a plurality of similar elements 15 each having a vertical web 35 with an up per arcuate, a double flanged rim 36 and a box or frame 37 extending from either side of the web a distance slightly greater than the extent of the flanges of the rim 36 so that, as shown in Figure 4, the boxes or frames 37 will position these elements so as to leave a small space between adjacent rims 36.

At the proper place on the length of the bar 10-, as determined by the position of the existing shaker bar lever 25, pivoted to the body casting in some fashion, usually by means of, a bracket 26', an element quite similar to the element 15 is located, these elements 20 differing in that they are provided with an elongated downwardly extending lug 21 perforated as at 22 to receive a bolt 23 to fasten it to the shaker rod 24:.

To install one of these grates for burning small size coal, the bar 10 is cut to length to fit and if one end 12 is not already secured to it it is now secured in place and two of the elements 13 of proper transverse length, as determined by the furnace itself, are slipped in place, then a number of ap propriate sized elements 15 are slipped over the bar 10, then a lugged element such as 20 and then the main body of the elements 15, which may be all of the same size or which may vary. For example, the existing body of the furnace shown in Figure 2 lends itself to the use of a single size as the dimension from front to back, and the location of the bearings is such that all three of the grate bars may be of the same width and the three will just fit the body.

I11 the circular furnace shown in Figure 1, however, the body is irregular, having a plurality of bays 40 at each side and having a rounded front 41 and a rounded back 42. In this case the center bar may be made with only two different sizes of plates or ele ments. Viewing the furnace from the front and counting from the left, the first element shown is the rim of the end section 12 and it is of fairly large size. The next two elements are like that shown in Figure 7 and are of the same transverse length or greatest dimension as the end pieces, but all of the elements in the center of this bar are of the same size. The front and back bars, which it will be noted, are smaller and interchangeable, are composed of a great number of elements each one different altho one dimension from edge to axis of the bar, it will be seen, is constant. This constant dimension may be selected in practice to suit ones fancy but I find that 2 inches is a very useful standard. In assembling the front and back grate bars the workmen will select from the stock on the wagon progressively increasing sizes up to the center and then duplicates for the other half. The number of different sizes must necessarily be such as to take care of practically any construction but I have had very great success so far with less than thirty different patterns and find that with this number I can meet substantially any requirement without allowing a hole to exist in the grate of suflicient size to pass coals of the size intended to be burned. The provision of the breakage slots 28 enable me to restrict the number of diiferent patterns in this manner.

IVhile the specific size of any piece is not a part of the invention I have found in practice that the most convenient thickness for the filler sections is about inch which would make the end pieces 1% inches thick and I find it convenient to space the breakage slots inch apart. The breakage slots sever the two flanges entirely and continue down the web of the filler as a score on each side. In practice I find that there is no appreciable danger of breaking accidentally along these severance lines, but at the same time when one of the elements is placed in a vice it is not at all difficult to crack oif the unwanted portion with a sharp blow from an ordinary hammer.

hat I claim is 1. A grate consisting of a length of commercial metal section, a plurality of end pieces secured to said section at the ends thereof, a plurality of grate members slidably mounted on said section and a plurality of grate members mounted on each end piece and provided with means preventing their removal transversely of said section and being held in position against longitudinal .ovement by the grate members positioned between the two end pieces.

2. A one-piece grate element consisting of a flat web having an arcuate top and its sides converging from the ends of the top to the bottom and having a rectan ular hole near the bottom; a flange extencing from each side of the web at the top to form a coal supporting rim, and a hollow rectangular frame surrounding said hole and extending from said web on each side to a plane beyond the side edge of said rim.

In testimony whereof I aflix my signature.

GORDON SIMMONS.

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