US12592A - photo-lithographer - Google Patents

Description

To all witom, @neemt e1 it :known thatfwel WILLIAM GILD andi WILLIAM GARRISON, of thezcity of Brooklyn, inthe county of `Kingsand State i of New Yorlnliave inventedanewAanduseful Improvement in the Means of Operating.. the Valves of"DirectAct`ion SteaniiEngiiies';`v

` andwedohereby deelare that the following is aNfullyclear, and exact description of the the same, reference beinghad to the accomf `panyingdrawings,;.forming part o-f this speciflcation, inyWhich- .Figure 1;,"is a longitudinal` centralsection' "ofadirect action steam engine with our ini vention applied,

of the valve.

. Similar letters of reference"indieate` corre#` spondingparts in `both figures.

`;` This invention "consists in certain novel lsimple `and effective means whereby the f valve is "caused `asthe stroke ofthe piston i *fterminates in eithergdirection, `tohave sud- `denly "impartedto fit the necessary move- 1 mentjto effect the return of the piston, the

same means serving also to relieve the valve `of `all unnecessary press-ure and friction upon itsseat. i A, is the steam cylinder havingthe steam portsa, a', an exhaustuport b, arranged in fthe usual way inthe valve seat. l B is the valve consisting of a platewhioh i is fplacedfparallel onitsface andback, and

is made with three `fopenings as shown in v Fig. 2,which areqso "divided that the space J i `{openings@,and thatcdge of the central "opening d, `which is farthest therefrom will just include onesteam port and the exhaust port inthevvalveseat. C, is a cap placed "Won the v Vthereto. This cap has its ends UZ', d, lapbetween the, outer edge "offeither ofthe outer back of the valve `and faced to t pingoverthe endsof the valve, and the space between these 3two overlapping ends bored truly perpendicularly to the valve :face tov receive a `piston E, which fits to should exceed the] length of the valve by l fabout the required length fof stroke of the valve. `It has cast `with `it. 'orotherwise firmly securedto ita cylinder D, which is work steam tighttherein" and which is supf ported upon the*` point Lof a rocking arm e,

which rocks on anyarbor or rockshaft f,

` iff working on fixed` bearings placed centrally l `withinl the exhaust cavity of the valve seat,

andlpassing through `an Opening g, made vwMrH GIrDlAVNnwMQr". Gi/iiltnisoiv,` on BROOKLYN, NEW YORK.

and `Fig. 2, is a face view PATENTOFFIOE N :eine ,vaLvEs IN `ijiiuic'lsiiccrING STEAM-nivGINEs.

March 27, 1855; Reissued July 29,

`through` the hammer the Wundern; `This piston has its upper Tor back sidevexposed 'yt-o-thejpressureuofthe steam fin the steam chest. The cap C, is confined to `the back of fthe val-ve only by 1thepressureofwsteam in the steam chest. It is connected with the valve Irod k, which when the piston has arrived at` a distance from the end of its stroke equal to about twice the required movement of the valve, is moved by a tappet arm z', on the piston rod striking one of `its nuts O-r fixed collars 7c, lo. The valve seat has two cavities y', j', outside the steam ports a, a', to allow the steam to pass under the ends of the valve to the steam ports.

` When the engine piston arrives near theend of its stroke and the tappet arm onits rod strikes one of the nuts on the valve rod it causes the cap to slide over the back of the valve some `distance before moving the valve, and by the time the end d or d, has come in contact with the end of the valve to commence moving it on its seat, the arm e, passes its line of culmination and the pressure of the steam which is always acting upon the piston E, to force it toward the valve then causes the arm e, to be thrown `suddenly over giving the piston E, cylinder D, and cap C, all a quick movement to reverse the position of the valve. This will be better understood by reference to Fig. l where the valve is represented in black outline at the left hand end of its stroke and the cap C, cylinder E and piston are represented at the same end of their stroke in blue outline, the port a taking steam and `the port a exhausting. The engine piston is shown in blue to have arrived near the end` of stroke and the tappet arm z' to be just coming into operation. The tappet moves the cap C, to the left till it larrives in the position shown in black when the arm e, having passed its line of culmination allows the pressure ofthe steam on the piston F, to throw the piston and cap to the position shown in red Outline where it is stopped by the cap striking the end of the steam chest. This movement from the black to the red position reverses the valve, opening the port a to the steam and a to the exhaust readyl valve to thev position shown in black and the` other parts to the position shown in blue.V

It will be understood that the piston E, takes so much of the pressure o the back of the valve as is due to its area, and the pressure acting upon the ends of the cylinder D and on the part of the cap surrounding it, is balanced as far as is desirable by the steam in the cavities j', y', acting below the valve and cap.

We do not coniine ourselves to the particular form of the valve or arrangement of the port-s further than is necessary to the Within described operation; but l Vhat We claim and desire to secure by Letters Patent :is-

Giving to the valve the Whole or part of the movement necessary to effect the change in the direction of the engine piston, by means of the steam acting upon a piston E which is arranged and applied to Work perpendicularly to the valve Within a cylinder D, attached to a cap tted to the back of the valve, and is supported against the pres sure of the steam by a rocker e, or its equivalent by Which it is caused to operate substantially as herein set forth. f

WM. H. GUILD. WILLIAM F. GARRISON. Witnesses:

J. W. CooMBs, J. Gr. MAsoN.

[FIRST PRINTED 1913.]

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