US304975A - strong- - Google Patents

Description

(No Model.) 3 sheets-sheet 1. j

Gr. S. STRONG.

STEAM ENGINE.

No. 304,975.- Patented Sept. 9, 1884.

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G. s. STRONG.

STEAM ENGINE.

No. 304,975. Patented Sept. 9, 1884..

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GEORGE S. STRONG, PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN T. MORRIS, TRUSTEE, OF SAME PLAGE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 304,975, dated September 9, 1884-.

Applicai ion filed February 4, 1884. (No modell To all whom it may concern.:

Beit known that I, GEORGE S. STRONG, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Steam-Engines, of which the following is a specification.

My invention consists of certain improve ments, fully described hereinafter, in the cylinders, valves, steam and exhaust ports and passages of steam-engines, and especiallyT of such engines as appertain to locomotives, Vthe main objects of myimprovements being, irst, to prevent friction in the operation of the valves; second, to arrange the seats of the steam-valves near to the bore of the cylinder, thereby diminishing the clearance and obviating loss of steam; third, to maintain the cylinder at a uniform temperature and prevent loss of heat by radiation; fourth, to make the passage for conveying the steam to the valvechamber direct and free from abrupt turns; and, fifth, to so arrange the structure comprising the cylinder, its passages, and the ex` tension of the said cylinder, when applied to locomotives, thatit can be economically made.

In the accompanying drawings, Figure l, Sheetl, is a vertical section (on the line l 2, Fig. 2) of the steanrcylinder and its adjuncts, made according to my invention; Fig. 2, Sheet 2, a sectional plan on the line 34, Fig. l, Fig. 3, Sheet 3, a vertical section on the line 5 6, Fig.-2, and Fig. 4, aview on the line 7 8, Fig.

. 2, the valve-chest covers being removed.

Around the cylinder A and cast therewith is a jacket, a, the annular space b between which and the said cylindaer constitutes a steam chamber or passage, communicating in one direction with a steam-passage, d, in the extension W of the cylinder, the said extension being such that one of the branches of the usual breechespipe can be secured to it and made to communicate with the said passage d. The cylindrical jacket is restricted to the central portion of the cylinder, as shown in Figs. 2 and 4, a portion of the said cylinder at and near each end of the same being quadrangular, as shown in Fig. l, cach quadrangular portion being chambered above and below at a and a2, and the chambers communicating with the annular passage b within the jacket. This passage, as shown in Fig. 2, communicates through short passages' f -f with two valve-chambers, D D', situated on one side oi' the cylinder, one near each end of the same, within the limits of the said quadrangular parts. In each of these chambers is secured a plate, E, formingaseat for a gridiron-valve, G, the openings Il. in the latter being preferably inclined, as shown in Fig. et, and corresponding with similar openings in the seatplate E. Then the valve at either end of the cylinder is open, the steam will be admitted tothe cylinder through a port, b', the outlett of this 'port into the cylinder being contracted,as shown in Fig. 2, but being in height the same as the interna-l diameter ot' the cylinder, and hence presenting an extended area for the passage of steam into the said cylinder. i The distance between the valve and the outlett is so short that the space within the port, generally known to engineers as clearance is very limited, and hence much of the loss of steam due to long passages between the valve and cylinder is obviated, this being one of the objects of my invention. Each ot the chambers D D is provided with a removable cover, m, and against the valve bear two cross-bars, a, backed by springs, so that if water should gain access to the cylinder the valve will yield to a limited extent and permit the water to escape. This device, however, forms no part of my invention.

H H are the two gridiron exhaust-valves situated on that side of the cylinder opposite the steam-valves, each exhaust-valve being contained within a recess in the quadrangular portion of the cylinder between the bottom of the said recess and a seat-plate, l, which has openings preferably inclined and correspondl ing with those of the valve.

The passage for the steam from the inletm to the annular passage b within the j acket is shown in Fig. 3 and by dotted lines in Fig. 2, where are also shown by dotted lines the exhaust passages w 1c, which terminate at the outlet y, communicating with the usual draft-pipe of 'the locomotive.

The cylinder and its jacket are preferably cast in one piece with the extension XV, con taining the steam-passage (l andthe greater portion of the two exhaust-passages w w, but near each end of the cylinder is an elbow-cast- IOO ing, M, one portion,p, of each of said castings being secured to the cylinder and forming the cover for the seat-plate I of the valve, and also a chamber, g, Fig. 1, for receiving the exhauststeani, and the portion q of each casting M being secured to one side ot" the extension WI, the chamber g of each casting forming a continuation (indicated by dotted lines in Fig. 1) of one of the exhaust-passages. castings DI M thus 'forni removable covers for the exhaust-valve seats, and at the same time aitord simple mediums i'or completi ng the communications between the cylinder through the exhaust-valve ports and exhaust-passages in the extension IW ofthe cylinder, and also tend to simplicity in making the casting composed of the cylinder, its jacket, and extension IV.

The ports y] of the exhaust-valve are substantially of the saine character as the ports i) of the steam-valves.

It Will be seen ihat the steam takes a nearly direct circuit iirst from the passage d to the jacket, thence directly into the cylinder, and after it has performed its dnt)v therein returning in nearly the same course and in the condition ot' exhaust-steam to the outlet y ot' the exhaust-passages, the object of this arrangement being to avoid as far as possi bl e all al irnpt and tortuons passages.

The cylinder is of course clothed with nonconducting` material and the usual lagging, so as to prevent the loss ot' heat by radiation, the constant presence ot' live steam in the jacket and chambers c and possessing the advantage of maintaining the cylinder at the desired temperature.

Each yalve, both steam and exhaust, has a sgindle, K, of Which a yoke, r, adapted tothe valve, forms a part.

It has not been deemed necessary to illustrate or describe Valve-operating mechanism,

rlhese elboW- as diiterent kinds of valve-gear may be used; but I n'oul d refer to the mechanism described in an application iiled by me January 19, 1884, Serial No. 118,026, as that which Iprefer for reciprocating` the valves.

A peculiar feature of thevalves when compared with those usually employed on locomotive-engines is that, instead of the ordinary single valve placed on one side or on the top ofthe cylinder and operating generally in a horizontal plane, there are two sets of valves operating in vertical planes.

l It should be stated thatthis system of valves may be adopted in connection with steam-engines other than those appertaining to locomotives.

I claim as my inyention-A 1. rIlle combination of a cylinder provided withtwo strani-valves on one side and a jacket snrreunding the cylinder and communicating with the chambers ofthe said valves and two exhaust-valves on the opposite side of the cylinder, with an extension, W', on the same, the said extension containing a steam-passage cornmunieating with the jacket, and passages for the exhaust-steam, all substantially as specilied.

2. The combination ot' a cylinder for locomotive-engines and an extensionAV, ofthe said cylinder, the said extension containing exhaust-passages with elbow-castings M forming cxhaiist-valve chambers and communicating with the exhaust-passages in the extension of the cylinder, substantially as set forth.

In testimony W hereof I have signed my name to this specification in the presence oftwo subscribing Witnesses.

GEO. S. STRONG.

NVi tnesscs:

JOHN Iiniirnz, IIAnizY Slri'rn.

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