USRE4279E - Improvement in steam engines - Google Patents

Description

spondling parts.

UNITED STATES, PATENT- OFFICE.

PHILIP ESTES, OF'LEAVENWORTH. KANSAS..l

'l IMPROVEMENT IN STEA-M'- ENGIN'ES.

Specification forming part of Letters 'Patent No. 108,576, dated October 25, 1670;"Reissue No. 4,'179, dated February 28, 1871.

ful Improvement in Steam-Engines; and I dav hereby declare that the following is' a full',V clear, and exact description thereof, which will enable others skilled in the art to make and usev the same, reference being had.to the accompanying drawings, forming a part of this specification.

Myinventionrelates to steam-engines; and my object is to introduce certain improvements thereon, which will first be described in connection with all that is' necessary to a full understanding thereof, and then be clearlyv pointed ont in the claims. In the accompanying drawings, Figure 1 represents a side view of the engine, showing the exhaust-valvepchamber and the cam by which the exhaust-valve is operated. Fig. 2 is a top or plan view of the engine, but showing the cylinder and the receiving and exhaust chambers in section, and giving a view of the ports to and from the cylinder for receiving and exhausting the steam. Fig. 3 is a detail of the cam for Working the Steam or receiving valve, Showing the mode of adjusting it 'for 'forming a variable cut-off. Fig. 4is an end View of the cylinder and valve-chambers.

Fig. 5 isa section of Fig. Fig. 6 isa crosssection, and Fig. 7 is a longitudinal section,- of the cylindrical Seats in which the valves work.

Similar letters of reference indicate corre- Ais the cylinder. B is the piston. C is the receivingchamber. vD is the exhaustchamber. These chambers are cylindrical in `form and attached to opposite sides of the cylnder A, and correspond in length therewith, as seen in the drawings. y

e represents the induction and' d the' educj tion ports of the cylinder, which, it`will be seen, are entirely' separate and distinct from each other. The steam is admitted to and exhausted fromcaclrend of the cylinder for cach stroke of the engine. This arrangement, of course, requires allouble valve for each cham.- ber.

F represents-'the dohble valve for the' induction or receiving chamber,and G the'double lvalve for the edu'ction yor. exhaust Lchamber.

Each `valve' consists of two heads connected" by the rods-H. The form of the seat in which the valve-heads'work is seen in Figs. 6 and 7.

i is a steam-'space around the rods H. j are' the valve-seats, which are open on their sides,

so that the Vpressure of steam isbalanced or equalized upon Vthe 'valve-heads, thus preventing the friction usually produced by slidevalves. .The valves move .on a line parallel with the piston of theengine. l v

vK is the stem of the induction-valve. L is the stem of the exhaust-valve.v The former is connected with the adjustable cam M, (see Figs. 3 and 4,) which cam revolves inthe yoke N, to which the valve-rod K is attached. The

cam M is fastenedfto the end of a small shaft, which is supported by the bracket 0. This shaft is revolved fromV the main shaft 'P by means of the gear-wheels g g. The bracket 0 lis attached-'to the frame R of the engine. The cam M isformed in two parts, S and T.

By means of the screw U the position of S may be varied on the part T, so as to out off the steam at any desired pointvof the stroke.

The exhaust-valve is moved by the crank Vy on the end of the wrist of the 'pitrnan by means of a cam, w, working in the yoke X. (Sec Fig. 1;)

I do knot confine myself to the use of l'cams exclusively for moving either of the valves the Eccentrics may be used in proper distance. this connection, if desired.

V By this arrangement and` operation o f the valves the exhaust-port is kept open during the4 entire stroke, thus preventing anyback-pressure uponthe piston. In 'order to accomplish this important object andforen'der practicable this peculiar feature of my invention, I operate the exhaust-valve by a cam Working in a yoke,

which makes one full stroke back and another forward during each revolution of the driving-shaft or axle'. short, is quickly made, when it moves loosely in the yoke until the piston has completediits full throw. Thus it makes no difference at what point the steam is cut off at the indue tion-valve, since in no event is any back action of steam upon the piston possible.

Its movement, being 'Having thus described my linventiop, whatfI f doble-headed vlv'es F G, the one oger'ated claim as new, anddesire to seourevzby Letters differentially and the other always ab full Patent, is-

" 2l A steamsupply chamber, Cl and an exstroke, for the purpose specie.

"1. Avariable com fon-.ned of tvwo parts, S T, lTo the above specication of my invention rraalged and operating to move the cut-off Ihave signed my hand this 19th davof Depont forward orbaoknthe mannerdescribed. ce'mbr, AL D. 187,0. Y o

y Y PHILTP ESTES. haust-chamber,f D, on opposite sides of .a pis r Witnesses:

ton-cylinder, Aghaving inlets e e, outlets d d; 'SoLoN C. KEMON,

andpistonB,a1l.combned,as d esoribedJwit-h THoS; D, D. OUQRAND. o

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