US308567A - Reversing-gear for steam-engines - Google Patents

Description

(No Modl.)

` 2 Sheets-Sheet 1. E. A. MARSH. REVBRSING GEAR P0P. STEAM ENGINES. No. 308,567.

Patented Nov. 25, 1884.

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(No Model.) A 2 Sheets-Sheet 2.

l E. A. MARSH.

REVERSING GEAR POR STEAM ENGINES.

No. 308,567. Patented Nov. 25, A1884-;

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ELON A. MARSH, OF BATTLE CREEK, MICHIGAN.

REVERSING-GER FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 308,567, dated November 25, 1884.

Application filed September 28, i881. (No model.)

To @ZZ whom t may concern.-

Beit known that I, ELON A. MARSH, of Battle Creek, inthe county of Calhoun, and in the State of Michigan, have invented certain new and useful Improvements in Reversing-Gear for Steam-Engines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specication.

This invention relates to certain improvements upon reversing-gear for steam-engines for which Letters Patent were granted to me December 28, 1880, No. 236,052; and it has for its objects to provide certain means for limiting the movement of the actuating-lever by means of adjustable stops, whereby the throw of the reversing-lever and the amount of lead to be given to the valve maybe regulated with precision, as more fully hereinafter specified. These objects I attain bythe apparatus and mechanism illustrated in the accompanying drawings, in which Figure l represents a side elevation of my improved reversing-gear; Fig. 2, a top view of the gear with the valve and valve-chest omitted, and Fig. 3 a perspective view oi' a standard provided with the adjustable stops for limiting the movement of the reversinglever.

The letter A indicates a cog-wheel mounted on the main shaft or driving-wheel shaft B of the engine, and C indicates a similar cogwheel of equal diameter with the wheel A, mounted on a suitable journal on the oarm D of the angle-lever E, by means of which the reversing-gear is shifted. The two wheels intermesh, and the lever Eis mounted on the driving-shaft, the said shaft forming a fulcrum, so that the levermay be partially turned thereon, so as to shift the wheel C. The said wheel C is provided with a wrist-pin, F, to which the valve-rod G is secured at one end.

The letter H indicates a segmental guide for the handle of the lever, which is provided with adjustable stops I, which are secured to it by means of set-screws K in any desired position to limit the movement of the lever 'as may be required.

In some instances it is found inconvenient to operate the lever directly, as above described, and in such cases an auxiliary lever,

L, may be employed, as indicated by the dotted lines in Fig. l, which is connected to the lever E by means of a rod, M. In the lastmentioned case it is found preferable to arrange the adjustable stops on an independent standard, N, rigidly secured to the enginebed, boiler, or other rigid support. The said stops in this instance are preferably formed by means of the stationary lugs P, having ad` justable set-screws It, and the arm D of the lever E is slotted, as indicated by the letter S, so as to embrace the sides of the standard N and prevent lateral play of the lever. It will thus be perceived that the movement of the lever is limited laterally as well as in the direction of its oscillation, thus securing the utmost precision in the operation of the reversing-gear.

To compensate for the effects of wear, the bearings of the lever and the journal of the wheel C are divided on one side, and are held together by means of clamping-screws T, by means of which they may be tightened whenever they become loose.

One of the jaws of the slotted arm of the lever E is provided with a set-screw, U, by means of which the said arm maybe adjusted to closely embrace the standard N and take up wear.

The operation of the reversing-gear in the present instance is substantially the same as that described in my former patent above mentioned; therefore it is notdeemed necessary to more fully describe it in the present j case.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a reversing-gear for steam-engines, the combination of a pivoted arm for carrying the reversing-wheel, a valve-rod, arcachrod operatively connected with the pivoted arm, a lever for actuating the pivoted arm through the reach rod, and suitable stops, against one or the other of which the pivoted arm abuts when thrown from one position to the other, substantially as and for the purposes set forth.

2. In combination with the lever, the gear- Ioo Wheels, andthevalve-lod, the segmental-guide a lever adjustable around said shaft as a eenand adjustable stops7 substantially as and for ter, and carrying crank-Wrist, to Wheh the the purposes specified. valve-rod is connected, in combination with 3. In combination with the lever carrying stops limiting the throw of said lever.

5 the reversing-Wheel and slotted at its extrem- In testimony whereof I afx my signature,

ity, the standard, and adjustable stops, the in presence of two witnesses, this 6th day of whole arranged to operate together substan- September, 1881. tially as specified.

E, A. MARSH.

4. In a reversing-gear for steam-engines, \Vitnesses: Io the two gears of equal diameters, mounted one A. II. BRIGGS,

0n the main engine-shaft and. the other upon D. G. SIMONS.

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