US506061A - Valve-chest for steam-engines - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

W. H. MYERS.

VALVE GEEST FOR STEAM ENGINES.

No. 506,961. Patented Oct. 3,1893.

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UNITED STATES PATENT IfFEIcE.

VILLIAM H'. MYERS, OF BROOKLYN, NEW YORK.

VALVE-CHEST FOR STEAiVh-ENGINES.

SPECIFICATION forming part of Letters Patent N o. 506,061, dated October 3, 1893. Application filed May 25,1893. Serial No. 475.491. (No model.)

To a/ZZ whom t may con/cern:

Be it known that I, WILLIAM H. MYERS, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Valve-Chests for Steam-Engines, of which the following is a full, clear, and exact description.-

My invention relates to improvements in valve chests for steam engines, and has for its object to provide a steam chest of a novel construction, which will be adapted for convenient application upon the valve seat of a slide valve steam engine, and convert it into a steam engine whereon multiple rocker valves and their appropriate actuating gear can be used, so as to secure all the advantages pertaining to such multiple valves, forl an old style slide valve steam engine thathas been supplied with the improvement.

To this end, my invention consists in the peculiar construction of the valve chest and its combination with a steam cylinder,as is hereinafter described and claimed.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a side View of a valve chest containing the improvement and rocker valve actuating gear on it. Fig. 2 is a sectional plan View of a steam engine cylinder and piston in part, and the improved valve chest with attachments thereon, taken on the line 2-2 in Fig. 1. Fig. 3 isa sectional side view of the improved valve chest and valves there- Fig. 4 is apartial face view of the valve seat of the slide valve engine,which is to be itted with the improvement, seen opposite the arrow 4, in Fig. 2. Fig. 5- is a side view in part, of the improved valve chest face, which in service is secured upon the slide valve seat of an Vengine which is to be supplied with the improvement; and Fig. 6 is a sectionalview of parts on the line 6`6 in Fig. 3 in the `direction of an indicating arrow in said'iigure.

The steam engine to which the improvement is best adapted for application and use, has a horizontal cylinder A, and an elongated valve seat B, which seat extends along the outer side of the cylinder parallel with its bore, and when arranged for service is vertical on its face.

The valve seat B is shown in Fig. 2, constructed as is usual in this type of steam engines, having live steam ports a, and exhaust steam ports b, formed in its face. The ports a, b, are duplicated, a pair being located near each end of the cylinder A, having an intervening bar located between the adjacent and parallel ports a, b, of each pair. The live steam ports a are inlets for steam into the passages a', that are produced in the cylinder A and extend oppositelyto tap the inner surface ofthe cylinder at its ends. The other ports b, which lie between the live steam ports a, have communication with the exhaust duct b', that extends longitudinally in the cylinder wall, and is tapped at any suitable point for the discharge of exhaust steam, as indicated at b2 in Fig. 2.

The improved valve chest O is cast into rectangular form from'a suitable metal, and preferably the side wall c, of the chest that is parallel with the valve seat B is made integral with the other walls of the same.

Such proportionate dimensions are given the chest O as will permit itto [it upon the valve seat B and substantially conform its outer edge with the margin of the latter.

The face of the chest O that has contact with the valve seat B is made true and steam tight, studs or bolts d being used vto secure the chest upon the engine cylinder, which bolts are inserted through holes d formed in the chest and thence into threaded holes d2 produced in the valve seat B, when the improvement is secured upon it.

There are two steam passages e, f, transversely formed in the chest C, near each end, each'pair being so spaced apart by an intervening wall g, that a passage e will conform with the live steam port a, which is at that end of the valve seat B, and the passage f with the adjacent exhaust port b.

The valve chest C is rendered light and yet affordedproper strength, by the production of a rectangular central cavity h, in it, and a smaller cavity ,near each end, as shown in Figs. 2 and 3.

At a proper distance from each of the four corners of the chest C, the four transverse cylindrical steam chambers m, m are produced, which chambers are formed of an equal diameter, and are rendered true within, for the reception and proper action of the rocking valves n, 'n'.

The pair of chambers m, that are nearest to the top wall of the chest C, are for the reception of live steam,that is conveyed to each Valve alternately through the live steam duct o, which is formed in the wall of the chest, and terminates at each end in one of said chambers, the duct o receiving steam from a supply pipe 19, that is secured in an linlet aperture which is formed in the cylinder A, and made to intersect the duct o at any den sired point.

The steam passage e, at each end of the chest C, extends between a steam chamber m, and a lower chamber fm', the latter named chambers being designed to relieve the cylinder A of exhaust steam by the proper action of the valves n therein, a valve n. in each upper chamber m, controlling the introduction of live steam into each passage e.

As shown in Fig. 3, the lower steam chambers m are intersected by the branches f from the exhaust steam passages f, so that a proper rocking movement of each valve fn will permit the escape of steam from e, through n', into f, and thence into the exhaust duct b', and through h2 out of the cylinder. The rocking valves n, n', are set as shown in Fig. 3, one live steam port in an upper chamber m, being open when the one at the other end of the cylinder A is closed; and in the lower chambers fm', the valve n', that is directly beneath the opened valve n, is then in closed adjustment, which eects a transmission of live steam from the duct o, into the cylinder at the end where these two valves are located, the valve n', in the remaining chamber m', being opened to allow exhausted steam to escape from the cylinder A through o, intof,f, and thence to the exhaust duct b.

The rocker valves fra/n', are preferably actuated by a valve gear of well known construction, comprising the rotatably supported crank disk D, rock arms E, pivoted by one end of each to a link E', that is pivoted at its other end to the disk near its periphery, said arms being each secured upon a shaft F, that is secured at its inner end to one end of a rock valve, as indicated in Fig. 6, the relative arrangement of said parts being such as will adapt the rotatable movement of the disk D to communicate a proper action to the valves n, n', which have been set to operate as previously explained.

The disk D is rocked a proper degree by an eccentric rod G, that is reciprocated as usual by an eccentric on the main shaft of the engine, and which previously actuated the slide valve that the rocker valves take the place of.

Rods I pivoted on arms I, mounted on the shafts F extend downward to enter dash pots (not shown), and crank arms J on the shafts F altord means to connect each live steam valve fn., with a governor, (not shown,) which parts when in proper adjustment complete the rocker valve gear, thereby converting a slide Valve engine into' a steam engine of the multiple rocker valve type, when said parts are employed in connection with the improved steam chest C, that embodies the features of improvement.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. A valve chest attachable upon the valve seat of a slide valve engine, having a transverse cylindric chamber at each corner of the chest, and communicating steam passages formed in the chest, substantially as described.

2. A rectangular valve chest attachable upon the valve seat of aslide valve steam engine; transverse cylindrical chambers therein near the corners of said chest, a transverse live steam passage and a parallel exhaust steam passage in the chest near each end, and respectively adapted to conform with live steam and exhaust steam ports in the engine valve seat, which steam passages intersect the chambers and are controlled by rocker valves therein, substantially as described.

3. The combination with a steam cylinder, and an elongated valve seat thereon having a live steam port and a parallel exhaust steam port near each end, of a valve chest attachable to said cylinder, containing transverse cylindrical steam chambers near the corners of thechest, and a transverse live steam passage and a parallel exhaust steam passage in said chest near each end, and adapted to conform with the live steam and exhaust steam ports in the valve seat, said passages intersecting the steam chambers and being con trolled by rocker valves in said chambers,`

substantially as described.

VILLIAM'H. MYERS.

Witnesses:

TRAVIS TAYLOR, AMBRos A. TRIPOLD.

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