USRE5729E - Improvement in spark-arresters - Google Patents

Description

1. RICHARDS 8L1.- MEEHL.

Spark-Arresters.

N0 5 7.29, ReissuedJan. 13,1874.

UNrrEn STATES PATENT OFFICE.

' JACKSON RICHARDS AND JACOB MEEHL, QF PHILADELPHIA, PA.

IMPROVEMENT IN S PARK-ARRESTERS.

S ecification forming part of Letters Patent No. 143,931, dated October 21, 1873; reissue No. 5,729, dated January 13, 1874; application filed November 21, 1873.

To all whom it may concern:

Be it known that we, JAcKsoN RICHARDS and J A0013 MEEHL, of Philadelphia, county of Philadelphia, State of Pennsylvania, have in vented certain Improvements in Locomotive- Chimneys, of which the following is a specifigases are permitted, by the said obstruction,

to pass upward into the chimney.

In the vertical section, Figure 1 of the accompanying drawing, A represents the chimney; F, the obstruction, situated centrally within the cylindrical" portion of the chimney above the orifice of the usual petticoat-pipe, throughwhich the exhaust steam is discharged. This obstruction, by which the passage for the steam and gases is gradually contracted, so far neutralizes the effect of the violent intermittent action of the exhaust steam as to prevent it from being the cause of extracting any but comparatively small and light particles of fuel. e prefer to so construct this obstruction that, while it gradually contracts the passage for the steam and gases up to a given point, it will serve the additional purpose of catching such sparks as may enter the screen,

referred to hereafter, thereby preventing such sparks from entering the pettic at-pipe and exhaustnozzles; hence we make the obstruction hollow, so as to receive the said sparks. \Ve also prefer to form on the exterior of the obstruction annular ribs f, which present sharp edges to the sparks; or, in place of the ribs, the exterior of the obstruction may be studded with teeth f, arranged as shown in the detached view, Fig. 2. Although the obstruction tends to diminish the quantity of sparks as well as their bulk, particles of nited fuel must enter the chimney and pass the obstruction; hence, it becomes necessary to so dispose of these sparks that they cannot I escape from the top of the chimney in an ignited condition. We therefore combine with the obstruction such a screen as will sift or disintegrate the sparks and render them harmfor the screen to be so constructed and arranged that the passage for the escape of the steam and gases should be expanded immediately above the top of the said obstruction, for we have ascertained that the best results are attained by permitting the free expansion and escape of the steam above that point.

Particles of ignited fuel or sparks, diminished in number and bu] k by the presence of the obstruction, will be projected upward into and through the annular space between the chimney and screen, and will have a tendency to escape through the perforations of the latter with the steam and gases. Many of the sparks, however, before reaching the screen,

will be brought into violent contact with the obstruction, and will be thereby disintegrated and reduced to a condition which permits them to pass at once through the perforations, while other particles, in passing upward and seeking the perforations, will be triturated by con-" tact with the screen, and being thus disintegrated will pass through the same, a few heavier particles which may fail in their efforts to penetrate the screen, striking the closed top of the annular space, and after falling a short distance being again forced upward and again st the screen until they finally pass through the perforations and out of the chimney in a harmless condition. After passing through the 7 screen some of the sparks may fall and find a struction permits the steam to .carry upward temporary lodgment in the obstruction to be are disintegrated, all substantially as specified.

soon driven therefrom by the action of the eX- In testimony whereof We have signed our haust steam. names to this specification in the presence of We claim as our invention two subscribing Witnesses. In a locomotive-chimney an obstruction by J AOKSON RICHARDS. which the passage for the ascending steam and r I JACOB MEEHL'. gases is gradually contracted, and above which Witnesses the said passage is expanded, in combination WM. A. STEEL,

with a screen by which such sparks as the ob J. SHERBORNE SINGER.

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