US637754A - Engine. - Google Patents

Description

No. 637,754. Patented Nov. 2|, |899.

M. E. DURMAN. ENGINE.

(Applicatfon me@ Doc. 14, 1898.) (no Modem 2 sham-snm m. 631754. Patented. N0y.. 2|, lass.

M. E. DUBMAN.

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UNITED STATES y PATENT flPEEICE.

MIHAELE. DURMAN, OF VOODMRE, MICHIGAN.

ENGINE.

SPECIFICATION forming part of Letters Patent N o. 637,754, dated November 21, 1899.

Application filed December 14,1898- Serial No. 699,253. (No model.)

To @A7/Z whom t rit/Ly concer-n:

Be it known that I, MICHAEL E. DURMAN, a citizen of the United States, residing at Woodmere, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Engines, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention has referenceto engines of the compound type, and relates particularly to an improved valve adapted for use`in that class of engines and toa novel construction of the supporting-frame for the cylinders.

One of the objects of my invention is to construct a piston valve and'arrange the same within the casin g, or what will be termed hereinafter the valve-chest, in such a man! ner that the pressure of the live steam within the chest will be extended upon both ends of the piston and not confined to'one only, whereby the piston instead of being'retarded by the steam moving in one direction will be evenly balanced.

Another object of my inve'ntionis to provide a simple and effective frame to support the engine-cylinders and to construct the frame in such manner that while performing the usual function of a support it will always serve as and constitute the guides for the cylinder cross-heads.

With these objects in view my invention consists in the novel construction of an engine, of a frame for -the same, and in t-he peculiar arrangement and combination of the various parts of the engine and frame, as will be more fully hereinafter shown and described.

In the drawings, Figure l is a perspective view of the engine, illustrating ,the peculiar formation of thef frame, the engine-cylinder mounted thereon, and the mechanism for reciprocating the pistons. Fig. 2 is a vertical central section through the cylinders and valve-chest, showing the novel construction of piston and the arrangement of the piston in relation to the cylinders.

A is the high-pressure cylinder, B the lowpressure cylinder, and C the valve-chest, Which are preferably integrally formed in one casting. These cylinders are supported on a frame comprising four upright standards D,

which are secured to lugs or projections E on the cylinder-casting. The standards D are secured at their lower ends in a suitable base or bed-plate F, on` which the main engineshaft G is journaled in suitable pillow-blocks I-l. Upon the standards D are adjust-ably securedthe yoke-shaped slides l for the crossheads J. These slides are formed-of two parts d b, clamped together around the standards D by the bolts c. The cross-heads J are se cured, respectively, to the piston-rods K of the high 'and lowpressu re pistons. They are also connected by the connecting-rods L to the disk cranks M of the engine-shaft.

N are cross bars or rods secured at their opposite ends to the slides I.v t.

O is a cross-bar secured to the rods N and forming a bearing for the valve-rod P. This rodis connected by the connecting-rod Q with the rock-arm R on the rock-shaft R', journaled on the base F. R2 is another rock-arm on the shaft R', connected by the rod S to the eccentric S on the engine-shaft Gr..

The pistons in the cylinders A and B may be vof ordinary construction, andthe .pistonrod's pass out through suitable stuffing-boxes in the lower heads of the cylinders.

The valve T is of the type commonly known as piston-valves, and comprises a body portion d, having three heads or rings e, f, and g formed therein respectively at the two,ends and in the center of the body and leaving between them the annular spaces or channels i/and i. The body portion of the valve is hollow and is connected by suitable coupling j with the valve-rod, this coupling being provided with a series or plurality of perforations or apertures, permitting of free communication between the hollow body and the valve-chest below the valve. This valve controls the ports of both the high and low pressure cylinders, said ports being arranged as follows: 7c is a port leading from the upper end of a high-pressure cylinder to the valve-chest and opening thereinto at a point a short distance below the upper end of the valve-chest. lis a port similarly connecting the lower end of the highpressure cylinder` with the valve= chest. m and n are ports respectively connecting the upper and lower ends of the low-pressure cylinder with the valve-chest and opening IOO thereinto at points between the openings of` the ports la and Z and upon opposite sides of the exhaust-port o.

The parts being constructed and arranged as above described, the operation is as follows: Live steam is admitted into the valvechest through a suitable conduit-pipe U, preferably connected to the upper end of the chest. Supposing the'parts to be in the position shownin F-ig.2 of the drawings, the steam in the chest C will be free to pass through the port k into the upper end ofthe high-pressure cylinder, and will thus cause the downward movement of the piston in said cylinder. At the same time the steam which has been pre-l viously admitted in the lower end of the cylinder is free to pass through the port Z'into the annular channel t' between the headsf and g.V As lthis channel is also connected with the. port n, leading to the lower end of the low-pressure cylinder, the steam'from the lower end'of the high-pressure cylinder will thus pass freely into the lower end of the lowpressure cylinder and act toiraise the piston therein. Finally, in the position of parts shown in Fig. 2 the port fm offers a freeppassage for the steam previously admitted in the upper end of the low-pressure cylinder to the channel h between the heads e and fof the Valve and from said channel into the exhaust-passage o, connected therewith. After the piston in the high-pressure cylinder has been driven downto the lower end of said cylinder and the piston in the low-pressure cylinder correspondingly raised to the upper end the position of the valve will bereversed, this being accomplished by means of the ec-, centric S', rod S, rock-arm R2, rock-shaft R',

Vrock-arm R, connecting-rod Q, and valve-rod P. These parts together will operate to raise the valve into a position where the port Z is in free communication with the live steam in the valve-chest. The ports 7c and m are conand the valve can be readily Y the latter to be more readily reciprocated than if resistance were formed to'said valve by the steam. Moreover, the construction of the valve, which permits the result above referred to to be obtained,i s exceedingly simple,where by the liability of the disarrangement. and breakage of parts is reduced to a minimum, manufactured at a small cost. d

What I claim as my invention is-- In a compound engine,the combination with a base, a pair of vertically-arranged guiderrods ixedl y secured at each end of the base,

a high-pressure cylinder mounted upon and connecting one pair of rods,a low-pressure cylinder arranged upon and connecting lthe opposite pair of rods, a Valve-chest intermediate the cylinders and connecting the same, a yokeshaped slide adj ustably secured to each guiderod, each slide being formed in two parts, clamped to 'each other and to the rods and arranged in pairs, as" shown, a vertically-reciprocating cross-head engaging eachfpair .of guides, a main drive-shaft mounted upon the base, disk cranks upon said shaft and a connecting-rod between each crank and its respective cross-head.

In testimony whereof I affix my Isignature in presence of two witnesses.

MICHAEL E. DURMAN.

lfVitnesses: f

` M. B. ODoGnER'rY,

H. C. SMITH.

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