US213311A - Improvement invariable exhausts for locomotives - Google Patents

Description

, E. R. ADDISON.if

Variable Exhaust for Locomotives No. 213,311 Patented Mar. 18,1879.

N,FETEHS. PHDTO-UTHOGRAPMER, wAsHxNGToN. d C.

NIIED'TATES PATENT FFICE.

EDWIN R. ADDISON, CF CINCINNATI, OHIO.

IMPROVEMENT IN VARIABLE EXHAUSTS FOR LOCOMOTIVES.

Specification forming part of Letters Patent No. 213,3ll, dated March 18, 1879; application iiled August 15, 1878.

To all whom it may concern.-

Be it known that I, EDWIN R. ADDISON, ot Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Variable Exhausts for Locomotive-Engines, ot' which the follow-` ing is a specification:

The object of my invention is to provide an exhaust-passage readily variable in capacity, and providing a free and smooth delivery in all conditions of its adjustment 3 also, one that will be effective in use, durable, and not liable to get out of order.

rIhe casing of the variableexhaust-nozzle is made in two parts, to admit of adjustment in case ot' wear from use. Within this are a pair of curved valves or leaves working on trunnions, and made ,to approach or recede from each other by means of cams yoked to their concave backs and operated through the medium of pinions on their journals by a sliding rack having two sets of teeth engaging with the said pinions in such a manner that when the rack is moved in one direction a simultaneous movement will be imparted to the valves, causing them to approach each other, and when it is moved in the other direction they will be made to recede from each other.

In order that my invention may be more fully understood, I will proceed to describe it with reference to the accompanying drawings, in'whieh- Figure l is a front View, partlyr in section. Fig. 2 is a rear view with one-half of the casing removed. Fig. 3 is a horizontal section on the line 3 3, Figs. l and 2.

A. A are the two parts of the divided cas ing, within which are a pair of convexfaced valves or leaves, B B, working on trunnions b Z1 at their lower ends, and operated by cams C C, which occupy the cavities in the hollow backs of the valves, and are encircled by yokes D D, attach ed to the valves B B, so as to cause the said cams, by their rotation, to move the valves toward and away from each other. On the front journals of the cams C C are keyed pinions E E.

The simultaneous rotation of the two cams to produce the required concurrent movement of the valves is imparted by a double rack, F, made in the form of a cap, covering the pinions E E, and adapted to slide horizontally to the right and left across the face of the casing.

The rack-cap F being provided with two ranges of teeth, f and f', the one engaging with the lower side ot' one of the pinions E, and the other engaging with the upper side of the otherA pinion, it will be apparent that a' motion ot the rackeap in one direction will turn the two pinions in opposite directions in such a way as to throw the cams over against the backs ot' the valves and cause them to approach each other, and that the reverse move'- ment of the rack-cap will move the respective pinions in the other direction, causing the cams C C to press against the yokes D D, thereby drawing the valves apart and increas ing the capacity ofthe port or nozzle. I

In practice the cams C are fitted to the back of the valves B and within the yokes D in such a manner as to avoid any lost motion and admit of setting the valves accurately at any required proximity or distance asunder, so as to regulate the capacity ot" the opening with precision by the movement of the rack-cap F.

It will also be apparent that the convex curvature of the valve-faces gives a better and smoother discharge to the steam, avoiding any obstruction to the current or draft produced by the exhaust, and that the manner of mounting the valves on trunnions and forming their bottom and top ends to t the casing all the way across, and providing, their upper ends with ian ges t' projecting backward into suitable recesses, eft'ectually excludes dirt from the working parts, as well as increasing the wearingsurface and the consequent durability of the device.

The making ofthe case A A in two parts adapts it to be adjusted or set up to compensate for wear.

The rack-cap is held in place and guided by spring-plates G Gr, held by the same screw bolts H H which hold the casing together.

The movement ot' the said rack-cap to reguA late the exhaust may be effected, as desired, either by a connection with the reversing-lever ofthe engine or by a separate connection un= der control of the engineer.

Having thus described my invention, the following is what I claim as new therein and desire to secureby Letters Patent:

l.V The exhaust-nozzle casing, made in two equal or similar parts, A A', coupled by bolts H H, and containing` valves B B to regulate the capacity of the nozzle, the whole being` constructed substantially as herein shown and described. Y

2. The valves B B, constructed With vertically convex faces and concave backs, and Working Within the casing A A in the Inanner and for the purpose set forth.

3. The combination, in a variable exhaust, of the valves B B, cams G C, and `Vokes D D, constructed and operating substantially as and for the purposes set forth.

4. The rack-cap F ff', constructed substantially as described, and acting' on pinions E E on the journals of the cams C G, as explained.

5. The combination ofthe casing` A A', valves B B, cams C C, yokes D D, pinions EE, rackcap Fff, spring guideplates Gr G, and bolts H H, as and for the purposes set forth.

E. It. ADDISON.

Witnesses:

A. H. DIXON, GEO. H. HIGH.

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