US105119A - notes - Google Patents

Description

@lilith GEORGE NOYES, OF WASHINGTON, 'DISTRICT 0F COLUMBIA.

Letters .Patent No. 105,119, dated July 5, 1876.

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Www- Tho Schedule referred to in these Letters Patent und making pan of the name.

specification, in which- Figure 1 is a. side elevation of my improved devices, the steam-ehest cover being removed, i'or the purpose ci' showing the construction of the valve, the other parts being arranged for lregulating the point of cutting ofi' the steam by the hand ot' the attendant.

Figure 2 is a vertical central section of the parts shown-in fig. 1.

Figure-Sis a side elevation, showing the parts assu ranged for operation by the governor.

Figure 4 is nu end view of the valve.

Corresponding letters denote corresponding parts in the several figures.

4'lhisinvention relates to cut-oif valves for steamengines; und

lt consists in the construction, combiua'tomend ar rangemeutof the parts, as will be more fully described hereinafter.

In constructing steam-engines a great vnrietyoi balanced valves have been used as induction and eduction-valves, and as cut-off valves, and various forms of deyces have been used for opemting such valves; but mine is believed to differ from all that have preceded it, in that I use s double-seated hollow cylindricnl or tubular valve, through the center of which the stean passes, said valve working in a cup-shaped vessel made to receive it, and having apertures in it, through which the stcnrn passes from the valve, and in that the wedge which raises the induction-valve 'hasa positive motion with reference to thc valve-rod or bar, which receives its motionV from the eccentric, calmer. other valve-moving devices, when the valve is being opened, but which has an independent motion, or n. mo.- tion independent of the movement of such rod or bar when the valve is tobe closed, and, further, in that the devices employed for-producing the last-named results are novel in their combinations und arrangements.

A in the drawings refers'to the steam-chest, which may be of any'snitnble form, its lower surface being provided with au aperture for the reception of the valve und the cap or casing in which it works, the upper or steam-receiving end of the valve being in communication with the steamspace within suoli chest.

A' refers to the steam -induction passage, which lends from the valve to the cylinder, and A to the eductlompissage, which conducts the steam from the cylinder to the atmosphere or condenser.

B refers to the'valve, which consists of' a cylinder or tube having uponv its upper end a valve-seat, formed by causing a flange to project outward therefrom to rest upon the upper end of the cup creasing in which it works. At the lower end of the valve thereis to be formed another seat, which, when the valve is closed,

rests upon the lower endet the cup.

Across the upper end of this valve a bar'c'xtends, which is enlarged at its center, so as to receive thc end of the vulve-rod which works it., the ferm' of' which is shown at fig. 4.

This valve is open at, its upper and lower ends, so that,as'it is raised from its seats, thev steam passes down through it and ont through. the apertures formed in the casing whichshould be of brass or some other non-corrosive metal, and always of the same material of which the valve vis composed or made, in order that 4the expansion may always be tlie same in I both,Y wbichibs important, from the fact that the valve has'two bearing' parts upon the casing, 'audin order Athat both ma'ybear equally upon their seats. At the same time it is indispensable that the relative lengths of the valve and its casing should not change.

As will be' seen by referring to the drawings, this casiug is open at its upper end, but it is closed at its lcwerend, which rests upon the metal of which the stencil-chest is composed, while its upper end vpasses through a diaphragm or partition formed in the steamchest, or through the side-pipe of the cylinder, in which aperture it fits snugly,i1`ut in which it may iuovesniicientiy to admit ot' vits iongitudinal'expausion. Apertures are formed through the wail of this casingea' shown, so that. as the valve is raised, the steam may pass ,out through them to any desired uoint.

n B refers to the volver-od which nieves such valves, it being secured thereto, as shown in iig. Si, and pass ing up through the coverof the steam-chest, where it is provided'with a smiling-box t'orfpacking it. The upper portion of this rod may be square, or of any other suitable form to which to attach the anti-friction rollers, as shown in the drawings.

U refers to the valve-rod or bar, which, in this instance, is n. bar of metal, which rests and moves upon a plate or bearing, O, as shown in tige. 1 and 2. This rody or bar is to be connected to the eccentric, cam, or other valve-moving devices from which it derives its motion.

C1 refers to a slotted wedge, which rests upon the valve-rod or bar 0,'vfhere it is held in position by two screws, as shown iu the drawings. The slot iu this wedge is to be of such a length as to permit it. to move longitudinally upon the valve-rod or bar for n distance about equal to the length of the bevel upon its inner end.

C refers to a wcdge, which is to be attached to the valve-rod or bar at an point where it may be necessary to enable it to op rate the cduction-valvc, its arrangement being clearly shown in the drawings.

C refers to a hook or stop, which is tobe attached to the plate upon which the valve-rod or bar rests, or upon some other xed part of the engine, and is to extend outward, as shown, t the required distance, to enable it to stop the movement of the wedge C* as it is bein g carried away from the valve-rod B2, such cessation of its movement being necessary in order that the dog or triggerC may come in contact with its rear end, and that it may be placed in the proper position to raise thevalre B at the proper time upon its return movement.

U refers to a dog or trigger, which is pivotcd to the rd or bar O, and works in a slot formed therein, as shown in iig. 2.

The lower end of this dog extends below such bar for a distance suicient to enable it to comein contact with an adjustable stop, D1, hereafter to be described. The form of the upper cud of this dog is clearly shown in fig. 2, it being such that, when its lower end is i a vertical position, it shall project above the surface of the rod or bar C, and thus carry forward the wedge, which lifts the induction and cut-cti' valve until it becomes necessary to cut olf the steam, when' its lower end is made tc come in contact with the stop D, and that portion of its surface which was above the rod or bar U is carried-downward, and thc .wedge Cl is allowed to slide outward upon the rod or bar (l, when the valve B drops and the steam is cut olf.

C refers to a spring, which may be used to keep the dog or trigger' in position, should it be found neccssary, its arrangement being clearly shown in the drawings. n

.D refers to a guide, which may consist of a bar of metal secured tothe steam-chest, from which it extends outward for a' distance siiliicicnt to enable it to guide the adjustable stop D' throughout its entire range of movement, as shown in figs. 1, f3, and 3.

1) refers to an adjustable stop, which may h e of any suitable form, and is to be provided with a slot of the size. and shape of the guide D, upon which it moves, and also with a -pin for working in a slot in the arm which connects it with the governor, when one is used iu connection with it, as shown in tig. 3; but when arranged to be operated byhand, as shown-in figs. 1 and 2, it is to he provided with a nut for the reception of the adj usting-screw.

DL relcrs to a slotted arm, (in tig. 3,) which is attached to the sliding collar upon the shaft of the governor, or ilo that portion which is moved by weighted arms, or similar devices, for the purpose of controlling the speed of thc engine to which it is attached, it'bcing extended from such .point to the adjustable stop D, and provided with a slot to receive a piu attached thereto, in order that, as the position of such arm'is changed vertically by thc vaction of the governor', the adjustable stop D may be moved longitudinally upon its guide D, and thus the' point at which the induction-valve B shall he closed, and, consequently, the steam be cut oi, shall be controlled.

The device which corresponds to the one last described, and which is shown in llgs.- 1 and 2, consists of a screw, which may be operatedby the hand of the attendant, and thus the stop be placed in any desired position to effect the result'above named.

D3 D* D5 refer to dillerciit parts of the governoig and its connection with the slotted arm` above referred to, which may he of any approved form of construction, but which, considered separately, forms no part of my invention, and need not be more particularly described here.

The operationof my improved mechanism, and some of the advantages due thereto, may be stated as follows:

The parts having been constructed and arranged substantially as shown in tig. 3, the rod or bar C is supposed to be moving in the direction indicated by the arrow, the dog o'r trigger G being in thc proper position to cause the wedge C'l to move with thc bar C, which is carried forward by the eccentric or other valve-moving device until the point of the wedge Ul comes in contact with the roller B, when, through its action thereon, the valve B is raised from its seats, and the steam passes under its lower end to the cylindcr ofthe engine. The governor having previously been arranged to cause the adjustable stop l)l to stand in the proper position with reference to the dog or trigger C, it comes in contact with such stop, and its upper surface is depressed, which permits the wedge C1 to slide back upon the rod or bar 0and, consequently, the valve B to drop again to its seat, in doing which the flow of steam into the cylinder is arrested.

The downward movement of the valveB is caused by the weight of the parts connected therewith,- and bythe spring E. r

After the wedge Gl has receded and the inductionvalve has closed, the rod or bar O continues its movement inthe same direction until it has traveled through the space due to the throw of the eccentric, when its movement is changed to an opposite direction, carrying with it lthe wedge Cl, until its rear end comes in contact with the hook or stop C, when its motion is arrested; but as the rod or bar G continues to movc iu the same direction, it follows that the positiouot' the wedge will be the same as in the commencement, and that the parts are ready to repeat the operation above described.

It will be seen that, during the backward movement of the rod or bar C, the wedge OL comes in contact with the roller B upon theupper end of the ediletion-valve rod, and that .it will thereby be opened for the escape of the steam. As a consequence of the construction of the valve B, I am enabled to relieve it of nearly, if not quite, all of the friction usual upon steam-induction and eduction-valves, and thus effect a great economy of power, the opening movement requiring but a small amount of force to effect it, and the closing less 'than the opening. l

Another advantage dile, in parir, to the construe. tio'n of the valve, and in part to its combination with its operating mechanism, consists invthe rapidity with which, the valve closes when the point at which it is desirable to cut-off the steam has been reached, il; being a fact that thc more rapid the4 movement of lthe valve at such time, the greater thc economy in steam.

I am aware that double-seated valves, having bear-- ingr surfaces of different diameters, have been used for safety-valves, and, consequently, that they are not novel, when broadly considered. I am, however, not aware that a valve constructed as mio is, in the form of a tube, with a projecting bcaring-surface upon its` upper end of greater diameter than `the body of the tube, and a bearingsurlace upon its lower end of the same diameter as the body of the valve, has ever been made or used.

I do not desire to be understood as claiming, broadly, a cylindrical valve; but having thus described my invention,

WVhat I claim, and desire to secure by Letters Patent, is

.1. The double-seated tubular valve, of equal, diameter from the lower portion of the upper valve-scat to the upper portion of the lower seat, it being so arranged as to receive the steam upon its inner surface and discharge it through its lower cud, substantially as and for the purpose set forth.

2. The combination of the tubular valve and its cupshapedl casing, having aportar-ne 6r:- th, discharge of the steam, substantially as and for the purpose sot orth.

3. The combination o1 a Wedge for operating the ont-ofi' valve of a steam-engine, and a rod or bor which receives its movement from the eccentric or cam, when the parts are so arranged that the Wedge has a positive motion with reference to such rod or bar during a portion of its movement, but a motion or movement independent; of such rod or bar during the remainder of its movement, substantially/'as and for the purpose specified.

4. The combination .and arrangement of the rod or bar C, the movable wedge 01, trigger or dog C, hook 'or stop C, and adjustable stop D,substantially as and for the purpose set forth.

5. In combination with the ports enumerated in the l fourth clause, the slotted arm D, or its equivalent, and the governor, substantially :is and for the purpose set forth.

6. The arrangement of the valves B B, their rods' B2 B2, rollers B B, spring E, wedge Oi, and rod or bar C, as a consequence of which the movement of the rod or bar O is made to operate both the induction and eduetion-valves, substantially os shown and described.

In vtestimony whereof I lieve signed my name to this specification in ythe presence oi' two subscribing witnesses.

\ G. E. NOYES. Nitnessesz f F. H. SPRAGUE, B. EDW. J. Eins.

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