US171594A

US171594A - Improvement in spark-arresters

Info

Publication number: US171594A
Authority: US
Publication date: 1875-12-28
Anticipated expiration: 1892-12-28

Description

n; ALLARD. SPARK-ARRESTER.

Patented Dec. 28,,1875.

UNITED STATES PATENT rnen.

DERRICK ALLARD, OF ST. ALB'ANS, VERMONT.

IMPROVEMENT IN SPARK-'ARRESTERS.

Specification forming part of Lettere Patent No. 171,594, dated December 28, 1875; application filed March 8, 1875.

To all whom it may concern:

Be it known that I, DERRICK ALLARD, of St. Albans, in the county of Franklin, State of Vermont, have invented a new and Improved Smoke-Stack aud I do hereby declare that the following` is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming a part of this specitication. g

The invention relates to an im provement in the class of smoke-stacks for locomotives in which a vertically-adj ustable tube is elnployed to regulate the draft.

The invention is au improvement upon the smoke-stack described in vLetters Patent N o. 39,727 land consists in the construction and arrangement hereinafter described and claimed.

Figures 1 and 2 are side elevations, showing the ad just-able draft-regulating tube in different positions. Fig. 3 is a bottom-plan view; and Fig. 4, a Vertical section of the spark-arrester and the conical deflector, detached.

The lower portion of the casing or outer tube A of the smoke-stack is constructed with parallel sides, a'nd provided with the usual form of wire hood L; The inner tube B has also parallel sides, and isof such size that a considerable space is left between it and the casing A. It is provided with a flange, O, on

its upper end, which is turned downward, and a double-beveled or V- shaped ring, T, is at tached to its lower end. Said tube is adjusted vertically by means of a rack, I, 'piniou D, and crank E, and is guided in its Vertical movement by rods G Gr and S S, the latter working in keepers a a, which are attached to the innersde of casing A.

It results from this construction and arrangement of parts that the cinders and spar-ks carried up by the blast pass entirely through the inner tube B, being prevented from entering the space between it and the 'casing A by the beveled ring T, and first strike the twopart cone N y, whereby they are diverted outward against the under side of arrester K, and are by it turned in both directions, outward and downward and inward and downward, as

represented by the arrows in Figs. 1, 2. The

inward current is again deflected upward by the cap y of the cone, and escapes between it and the base portion N. The outward current is carried down between the inner tube B and casing A, and diverted by the beveled ring into the main current, by which 'the now broken cinders are again carried upward against :the cone N y. This Operation goes on until the cinders become so reduced as to enable theln'to 'escape with the blast through the hood L.

It will be seen that the beveled ring per'- forms an important function, in connection with the adjustable tube, in rthat it controls .the disposition or direction of the cinders,

both in their upward movement and descent, and prevents the blast entering the annular space be'tweeuthe tubes, whatever may be the adjustlneut .of the tube A. This feature, in conjunction With the relative form and arrangement of said tubes, enables a suppleinentary tube, such as shown in Patent No.

39,727, to be dispensed with.

The concave spark-arrester K and'conical defiector N y are attached to and supported by stationary uprights G G.

The tube B may be adjusted upward to meet, or nearly meet, the lower edge of the arrester K, and thus close, or nearly close, thel usual exit for exhaust steam and products of combustion. In such case the latter will find exit through the annular space between the tubes. The draft may be thus perfectly controlled.

What I claim isl The combination, with the casing A and the vertically-adjustable tube B, having parallel sides, and the beveled'ring T, attached to the latter, so that it may be adjusted therewith, as shown and described.

DERRICK ALLARD.

In presencc of H. F. SrEvENs, H. B. LEwsANr.