US 906083 A
Description (OCR text may contain errors)
0. N. TERRY. sum: ARBESTER. APPLIOATIOH FILED APR. 7, 1908.
Patented Dec. 8, 190 8.
UNITED srrnrrns PATENT OFFICE.
OTIS N. TERRY, OF LINCOLN, NEBRASKA, ASSIGNOR OF ONE-HALF TO ROBERT D. SMITH,
OF BOSTON, MASSAGH USETTS.
Specification of Letters Patent.
Patented Dec. s, 1908.
To all whom it may concern:
Be it known that I, OTIS N. TERRY, a citizen of the United States, residing at Lincoln, in the county of Lancaster and State of Nebrask'a, have invented certain new and useful Improvements in Spark-Arresters, of which the following is a specification.
The object of my invention is to provide a new and improved device for preventing the escape of sparks or live cinders from the smoke stack of a locomotive. My invention is also capable of employment in other connections.
The invention may be advantageously employed Within a so-called diamond head smoke stack.
The object and nature of the invention will appear more fully from the following specification and claims taken in connectionwith the accompanying drawings in which Figure 1 is a vertical sectionof a diamond head smoke stack showin my improvements. Fig. 2 is a plan view 0? the netting which extends across the top of the smoke stack. Fig. 3 is a vertical section of said netting,
- and Fig. 4 is a cross section on an enlarged scale of one of the grate bars shown in Fig. 1.
The ordinary cylindrical-smoke stack is designated by the reference numeral 15. A little below the top edge'18 a flaring wall 16 is attached which is continued above convergently in the wall 17. This smoke stack head comprised of the oblique walls 16 and 17 is what is commonly known as a diamond head. Near the upper edge of the cylindrical smoke stack wall 15 the brackets19 are attached by means of the bolts 20. At their upper ends these brackets support two parallel grates 21 and 22, which-are spaced a art by means of washers 24, being clampe tightly against these washers by means of the nuts 23 and 25.
Each bar- 26 of the lower grate 21 is thicker on the upper side than on the lower side; this the spaces 27 between consecutive bars converge upwardly. The upperface of each bar has a channel 28. In the particular embodiment of my invention which I have chosen to illustrate and describe, the two grates are castings made from the same mold and the upper grate 22 is the same. as the lower grate. inverted. This will be at once apparent from an inspection of Fig.1. Thus the bars 29 of the upper grate are narrower on the upper surface, the spaces 30 between the consecutive barsdiverge upwardly, and
the channels 31 are on the lower faces of the ate are stag-- gered with respect to those of t e lower grate, that is,each bar 29 is opposite a space 27.
This relation may be more exactly defined as follows: Each when a diameter is drawn across the grate bars the center of the grate will lie on this diameter midway between the center ofone of the bars on one side and the center of the adjacent space between bars on the other side. This condition being satisfied, when one of the grates is reversed and laid on top of the other, the bars of one directly over the spaces of t e other grate, and vice versa.
A wire netting 32 is stretched across the top of the diamond head smoke stack,as shown in Fig. 1, the edges being clamped in place by means of the rings 33 and 33*. Short pieces of wire 34 are bent around the strands of wire netting 32, the ends being brought together so as to prevent their escape, yet permitting them to hang loosely from the netting.
The operation of my invention will be readily understood by those skilled in the art. The escaping gases will be directed up through the lower grate 21 and will impinge against the channels 31 in the lower faces of the uppergrate bar, thus sparks and hve cinders will be interrupted and in some cases crushed by the impact and will either fall back down the smoke stack or be blown on out with decreased velocity through the upper spaces 30. The wire netting 32 efl'ectually prevents the escape of any sparks or live cinders that may e large enough to do damage. As is well-known, such a wire netting as ordinarily designed is somewhat likely to become clogged with soot and cinders.- I havefound by actual experience that this clogging is prevented by having loose members comprised in the netting. These loose members may be of various designs. In the particular embodiment ofmy invention which I have chosen to illustrate and describe, I have'simply taken ordinary fence wire staples and looped them over the strands of the netting pinching the ends together to prevent their escape. However, it is obvious that various other forms of loose members mi ht beemployed. These loose members by t eir vibration prevent the accumulation of soot andcinders on the netate is so constructed that ate will come tin It is to be observed that the grates arranged across the stack and provided with or the netting may, if desired, be employed separately, or their combination is very effective for the desired purpose.
Considerable.difliculty has been experienced in securing an effective spark arrester that will keep clean when used with lignite coal, and I believe that my invention is a solution of the diflicultyr I claim: I
1. In combination, a diamond head smokestack, and a perforated screen across the opening therefrom, said screen having a plurality of members each loosely attached thereto, and supported thereby.
2. In combination, a smoke conduit and a spark arresting device comprising a perforated screen arranged across the conduit with a plurality of members each loosely attached to the screen, and supported thereby.
3. In combination, a smoke-stack and a spark arrester comprising a perforated screen arranged across the stack and provided with a plurality of depending members loosely engaging the screen, and supported thereby. Y
4. In combination, a smoke stack and a spark arrester comprising a Wire netting short lengths of wire bent about the strands and hanging loosely therefrom.
5. In 'combination, a smoke-stack and a spark arrester comprising a. square mesh wire netting arranged across the stack and provided with ordinary fence wirestaples hooked over the strands and depending therefrom and having their ends bent together.
6. In combination, a diamond head smokestack, a perforated screen across said smokestack, members loosely attached to the screen, and a plurality of grates extending across the smoke-stack below the screen.
7. In combination, a smoke-stack, a perforated screen across said stack, depending members loosely engaging the screen, and a pair of grates extending across the smokestack below the screen, the bars of said grates being staggered.
In testimony whereof, I have subscribed \Vit nesses i LiLLLiN A. KIBBY, ANNIE C. COURTENAY.