US587843A - Injector - Google Patents

Description

' 2 Sheets-Sheet 1. (Model') W. T. MBSSINGER.

INJEGTOR.

No. 587,843. Patented Aug. 10,1897.

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(Model.) 2 Sheets-Sheet 2.

W. T. MESSINGER.

INJEGTOR.

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4.0 by w UNITED STATES PATENT OFFICE;

VILLIAM T. MESSINGER, OF BOSTON, 'MASSAOHUSETTS.V

INJECTOR.

pum- CA-'1162 forming part of Letters Patent No. 587,843, dated August 10, 1897. Application filed May 8, 1893. Serial No. 473,347. (Model.)

To all whom it may con/cern.-

Beit known that LWILLIAM 'l. MEssINcER, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Injectors, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention is embodied in an injector and relates mainly to the appliances for controlling the supply of steam and water to the injector, and also to the construct-ion of the overflow and discharge passage, these parts being applicable to injectors of any usual construction, and being for convenience shown and described as embodied in an injectort-the main fluid-forcing part of 'which is substantially like that shown in Letters Patent No. 390,031, granted to me September 25, 1888, the overflow and discharge controlling devices of the present invention being an improvement on the ones shown in the said patent. ln the operation of the injector as a boiler-feeder there must be a free communication with the Water-supply through the suction-pipe When starting the operation of thein j ector,so that a vacuum can be quickly formed and the Water quickly supplied to combine With the steam, and after the combined jet has been formeditis desirable to be able to control lthe flow of Water through the supplypipe to thereby govern the rate of feed to the boiler. xVhen it is desired to varythe rate of feed, it is not practical to do so by controlling merely the vflovv of steam to the injector, and, on the other hand, it is generally desirable and it is common practice to continue the steam under maximum flow, but govern the flow of Water through the suctionpipe to the injector and thereby control the rate of supply of Water by the injector. This has heretofore been commonly done by providing the Water-supply or suction-pipe with a valve independent of the valve that controls the admission of steam to` the injector, so that the former could be opened more or less Widely, according as a greater or less rate of feed was required, this being done without disturbing the latter of the two valves-t'. e., I

the one that controls the steam.

One portion of the present invention consists in providing the injector with a steammon to both, Wherebyvthe operator by ma- .nipnlating a single handle can open or close the steam-valve to start or stop the injector and by the same handle can vary the amount of opening of the Water-valve to thereby shut od more or less the supply of water While the steam remains turned on with substantially full flow. Thus when said handle is in one eX- treme position the steam-valve will be closed l and the injector not working. The Watervalve is so constructed as to afford a suicient opening when the handle is first moved to admit steam to start the operation and then open a further movement of the handle sufcient to open the steam-valve to maximum capacity the Water-valve is brought into position to afford the minimum opening, after Which further movement of the handle in the same direction grad nallyincreases the opening of the Water-valve, so that the handle may be left at any position of this last part of its movenient that may be necessary to open the Watervalve such amount as required to afford the Water-supply needed to maintain the proper rate of feed. This arrangement of the Watervalve is believed to be the most convenient and efficient, but it is not essential to the main invention, which consists in combining with the two valves a common actuating mechanism which can be operated to shut off to that afforded by the valve-stems themselves, said yoke being operated by the controlling-handle, which may be of any convenient, construction, preferably a lever provided with a suitable handle and also with a stop more or less the su pply of Water Without inter- Ioo' mechanism, and by'which the handle may be locked in any desired position, and a retracting-spring tending to move the handle so as to close the valves, although it is obvious that a handle having a screw motion may be used, in which case no lock or detent and retracting spring would be required.

The invention also consists in providing an outer chamber or shell around the end of the combining-tube of the injector, having an opening or outlet to the atmosphere and containing a separate internal space or chamber, which may be called the discharge-chamber of the injector, as it receives the fluid discharged by the injector and is connected with the delivery-pipe by which the said fluid is conveyed to t-he boiler or other point at which it -is to be delivered. The main shell or chamber that surrounds the end of the combining-tube and communicates With the atmosphere will be called the oVeriiow-chamber, and it communicates with the dischargechamber by an opening provided with a valveseat, which opening is controlled by a valve connected with a movable discharge-tube 4.which is automatically operated by the pressure of the liquid being forced.

Figure 1 is'a longitudinal section of an injector embodying this invention; Fig. 2, a longitudinal sectional detail showinga modiied construction of the operating mechanism for the steam and water valve; Fig. 3, a plan View of the water-valve detached; Fig. 4, a transverse section on line x4, Fig. l; Fig. 5, an end elevation; Fig. 6, a transverse section on line x6, Fig. l; Fig. 7, a detail showing a portion of the steam and Water chambers of the injector in end elevation; Fig. 8, a longitudinal section of the discharge end of the injector, showing a modification of the construction shown in Fig. 1; Fig. 9, a longitudinal section showing the novel form of overflow and discharge appliances used in connection with an injector of substantially the same construction as that shown in Fig. l, but without the novel steam and Water valve operating mechanism shown in Fig. 1; Fig. 10, a longitudinal sectional detail showing another modification in the construction of the overiiow and discharge appliances; Figs. 1l, 12, and 13, Sheet 1, diagram views showing different positions of the Water-valve.

The construction of the injector proper may be substantiall y the Same as shown in Letters Patent No. 350,545, granted to me October 12, 1886, or as shown in' Patent No. 390,031, granted to me September 25, 1888, or ot" any other suitable construction, being herein shown as like the former of said patents in the arrangement of the nozzles or tubes of the injector and like the latter in the arrangement of the steam-valve.

The injector proper comprises a steam-nozzle A, which is screwed into an opening in a casting B-, having an internal Water-chamber end in the water-chamber B2 and just in front of the delivery-orilice of the rst nozzle A of the injector. The said casting B also has longitudinal passages B5, (best shown in Fig. 2,) which connect the space in the casting B around the delivery end of the nozzle B4 with the source of steam-supply, so that `when steam is permitted to pass through the said passages B5 it gives a second jet of steam to act upon the `jet of water issuing from the nozzle B4'and to combine therewith and form V a jet issuing with strong pressure so as to enterthe boiler. The combining-tube and discharge-tube through which this jet issues is substantially different in construction from that shown in my former patent before referred to and constitutes a part of the present invention, which will be hereinafter described.

In the simpler construction shown inl Fig.'

9 the casting B, containing the water-chamber, with its delivery-nozzle and the first steam-nozzle attached thereto, (these parts constituting the Water-lifting part of the injector,) has connected to it by a coupling-nut O a casting E, provided with an inlet-opening E2, adapted to be connected with the steam-supply, said casting E thus constituting a steam-chamber which communicates with and supplies the first nozzle A, the steam from which operates to lift the water to the injector and to deliver it through the nozzle B, and the said steam-chamber also supplies the steam to pass through the passages B5 and enter thepbase of the combining-tube, so as. to combine with the water issuing from the water-nozzle B4 and form the combined jet to be delivered from the injector.

In the construction shown in Fig. 1 the steam-chamber E, having its inlet-opening E2, instead of being coupled directly to the casting B,'is connected with an intermediate or connecting `piece D, which is coupled to the casting B and surrounds the base of the nozzle A and communicates directly with the passages B5, leading to the mouth of the combining-tube. enters a recess D2 in the connecting-piece D, and said recess, together with the rear porl tion of the nozzle A, receives a tubular extension F of a part constituting a valve that The rear end of the nozzleA controls the passage of steam from the steaml chamber E to the mouth of the combiningtube of the' injector, which valve will be herealso provided with an internal valve-seat F3,

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which cooperates with a valve G, vwhich will" be called the primary valve, which valve G not only controls the iiow of steam from the steam-chamber through the tube F into the first nozzle A, but also engages and operates the secondary valve with relation to its seat D3, which is done as follows: Thevsaid secondary valve has one or more rearwardlyprojecting arms F4, provided at their ends with internal projections or fingers F5, which stand across the path traversed by the primary valve G in movingfrom its seat F3. The said valve G is connected with a stem G2, working through a bonnet E4, which forms one end of the steam-chamber in the casting E. When the valve G is moved from its seat F3, it permits steam to pass through the tube F to the first nozzle A, producing the jet, which tends to exhaust the air from the waterchamber B2, and to then lift the water to the injector. As the valve G continues its opening movementit will engage the fingers F5, and thus withdraw the secondary valve from its seat D3 and permit the steam to enter the passages B5, pass around the water-tube B4, and combine with the water issuing therefrom, this construction and mode of operation being substantially the same as in my former patent and being described here only to make clear the construction and mode of operation ot' the novel appliances which will now be described. This steam-valve-operating mechanism is combined with the water-valve which operates in a water-chamber H, that connects with the water-inlet B3 to the injector. This chamber H is mainly in the form of a cylinder arranged about parallel with the steamcylinder and provided with a head or bonnet H4, similar'to the one E4 at the end of the steam-cylinder. The said steam-chamber is provided with a longitudinal external rib E5, which, as shown in Fig. 6, rests upon the Water-chamber H, and said, rib E5 is also provided with lateral wings E5, (see Fig. 6,) preferably near one end of the steam-cylinder, which rest upon the water-chamber H like a saddle and insure the proper relative positions of said chambers. The end of the water-chamber H nearest the bonnet H4 is provided With upwardly-projecting ears or lugs H2, (see Fig. 7,) which receive the rib E5of the steam-chamber between them and are provided with internal notches H3, (see Fig. 7,) which receive corresponding lateral projections E7 from the rib E5, and thus lock the steam and water chambers together. The steam-chamber has to move longitudinally with relation to the water-chamber to interlock the ears H2 with the projections E7, and this may be done in putting together the injector by iirst screwing the water-chamber H into the mouth of the water-inlet passage B3 of the injector and then slipping the steamchamber longitudinally into place and securing it by the coupling-nut C. The waterchamber H is provided with an inlet-opening H5, adapted to be connected with the watersupply pipe, said passage H5 communicating with a port- H5, through a seat in the chamber H on which works the water-valve K. The said water-valve K is a slide-valve provided with a stem F3, extending through the bonnet H4 of the Water-chamber parallel with the stem G2 of the steam-valve G. Said valve K is in the form of a plate having an opening K3 sufficiently large to permit free passage of air and water to start the operation of the injector. When steam is wholly shut o and the injector is not running, the'opening K3 in the valve lies over the front part of the port H5, as shown in Fig. 1,'and when the steamvalve (which is operatively connected with the water-valve K, as willbe hereinafter described) is moved far enough p to open the primary valve without opening the secondary valve-that is, when ,it is moved until the valve G engageswith the fingers F5, but has not yet moved the secondary valve from its seat D3-the water-valve K is carried to the position shown in Fig. 11, with its opening K3 over the rear part of the port H5, thus still aifording a free passage for air and Water, so

that the steam which has been admitted to the first nozzle A of the injector by the before-mentioned opening of the steam-valve rapidly exhausts the air and causes the water to be drawn into the water-chamber of the injector to combine with the steam issuing from the nozzle A and be delivered therewith through the nozzle B4. This first movementv of the steam and water valves that causes the water to be drafted and the operation of the injector started brings the end K4 of the water-valve just about in line withv the front edge of the port H5, so that further movement of thewater-valve in the same direction will afford an opening between the front edge K4 of the valve and the edge of the port H5, as shown in Fig. 12, but the first part of such movement, while increasing the opening at the front edge of the port H6, correspondingly IOO IIO

shuts off the passage at the rear edge of the port through the opening K3 of the valve, and this condition continues while the valve moves from the position shown in Fig. l1 to thatshown in Fig. 12, in which movement the opening at the rear edge has been grad- 'y uallyclosed and that at the front edge gradually opened, while the total or aggregate opening has remained constant. ment of the water-valve from the position shown in Fig. 11 to that shown in Fig. 12 is accompanied by a movement of the primary steam-valve G while engaged with the arms of the secondary steam valve 'and is suffi-v cient to open the secondary steam-valve to substantially its maximum capacity,so that any further movement of the steam-valves will merely slide the tubular portion F of the secondary valvein the passage at the base of the nozzle A ywithout making any change in the flow of steam through or around the said nozzle A, said steam flowing through both paths-at maximum rate. The further moVQr This move-4 ment of the water-valve, on the other hand, from the position shown in Fig. 12 will increase the opening between the edge K4 of the valve and the front edge of the port, as shown by comparing Fig. 12 with Fig. 13, and by such movement the valve may be brought to any position between that shown in Fig. 12, which' gives the minimum opening for supply of water, to the position shown in Fig. 13, in which it is wholly withdrawn from the port H6, so that the water is permitted to flow to the full capacity of the port-opening H6, which is ot' proper size to supply the maximum capacity of the injector.

The steam and water valves are both operated by a single operating mechanism, their stems G2 and K2 being both connected with a cross-bar or yoke M, pivot-ally connected at M2 with a handled lever N, fulcrumed at N2 on a link N2, pivotally connected at N4 with the wate'rchamber. The yoke M is shown as a U-shaped piece, the ends of the branches of which are connected with the ends of the valve-stems G2 and K2, said U- shaped piece having a central longitudinal opening, so that it is substantially in the' form of two parallel U-shaped plates united at the hub or boss, through which the fulcrumpin M2 passes, and at the ends, which embrace the valve-stems. The said doubleplate yoke is also connected at M3 with a rod M4, working in a tube or sleeve M5, secured at M6 to the end of the rib E5 between the steam and water chambers, and the said sleeve M5 contains a spring M7, acting on a shoulder at the end of the rod M4, with a tendency to draw the same inward, or, in

other words,to move the yoke toward the position at which the valves are closed. Besides thus 'providing for the retracting or valve-closing spring the rod M4 and sleeve M5 also contribute to the guidance of the yoke, but such guidance for the yoke is not absolutely essential, although it tends to relieve with the sleeve M5.

the valve-stems from possible lateral strain in the operation of the handle N.

In order to facilitate the determination of the proper positions for the operating-lever N and to hold the same and the connected valves in the desired position to give any required tlow of water, the said parts are provided with a locking device or holder, shown as a pawl P, pivoted at P2 within the doubleyoke plate and cooperating with a toothed holder-bar P2, secured to or made integral The said bar is provided with notches p p2, dro., arranged as shown, the said notch p being located in such position as to stop the lever when the yoke is moved far enough to open the valve G, but before the latter hasv moved far enough to open the secondary valve, so as to permit the steam to pass its seat D3. Thus with the hand-lever stopped with the pawl P in the notch p steam is admitted to the first nozzle and the water-valve is brought to the posip tion shown in Fig. 11, so that the steam-jet issuing from the nozzle A exhausts Athe air from the water chamber and pipe leading to the water-supply and drafts the water, so as paratus. The movement to the next notch causes the secondary valve to be opened at and the steam to be delivered to the mouth of the combining-tube around the orifice of the .8 i

will be opened more and more until finally 9a the maximum flow is permitted. The Hlis widened transversely to the line of move `7' to start the injector, as before describedthat is, with the handle N stopped at the rgt notch the injector is set in operation effect` ively for lifting the water to the injector, but is not yet started effectively as a forcing ap ment of the valve K, so that a comparatively short range of movement is sufficient to com trol thefiow of waterwithin the desired limits, and the port-opening is rectangular, so that the change in area of opening is proportional to the movement of the valve.

ing been turned on the maximum amount,

If itis desired i to again reduce the fiow of water after havwoy the lever may be moved back by lifting the pawl P from the notch that it is in, and thus the valve K may be caused to cover or close the port H6 to a greater or less extent'.

In the closing movement of the Water-valve valves toward their closed position the fingers F5 of the secondary valve are retained in engagement with the main valve by a spring F", which acts upon the secondary valve with a tendency to close it, and thus retains the sc at F2 of the main valve in advance of the lsaid main valve as the latter moves toward lits closed position until the movement is imm-` cient to seat the secondary valve at D3. The water will, however, be cut ol to minimum `:o5 and accompanying movement of the steam tio A flow before the secondary valve is seated aty D2, and consequently the dow of water cnbe regulated to any desired amount between maximum and minimum at any time by moving the handle back and forth, asrequired,and it is only when the steam is to be wholly cuty close the secondary valve at D3 and then close the main valve at F2.

To facilitate the disengagement of thepagwl i P from the teeth of the bar P2' to permit the tad j od and the injector stopped running that the handle is moved far enough inward to first return or closing movement of the valves,the`

said pawl is provided with a projection P',

' extending into the lever N and lying under a pawl-lifting rod P5, extending through the said handle and projecting from the end thereof, as shown at P6, in such position that the said rod can readily be pressed down by the thumb of the hand grasping the handle, and when thus pressed down it bears upon the projection P4 of the pawl, so as to turn the said pawl on its pivot P2 and raise its forwardend from the notches of thelocking-bar. The handle-lever N is recessed to embrace the yoke-plate M where it is connected therewith, and has side wings N0, which extend forward at each side of the yoke-plate and across the ends of the pins that connect the' pawl P and rod M4 with the double yoke-plate, so that after the lever is in place and secured by its fulcrum-pin M2 the said pins at M3 and P2 cannot become dislodged, and said pins do not require to be headed or screw-threaded in order to afford a secure connection between the double yoke-plate and parts connectedv with it by said pins.

Instead of a lever any other suitable device may be employed to operate the two connected valves--as, for example, the screw N10, Fig. 2, working in a threaded bore in the sleeve M50, and provided with a suitable handle N12 to rotate it, said screw being provided with a flange or collar N13, engaging ashonlder inside a sleeve extension M20 of the crossbar or yoke M10, connected with the valvestems G2 K2. The cross-bar of the handle N12 itself engages a shoulder at the outside end of the said sleeve M20 to cause the sleeve and the connected yoke and valve-stems to accompany it. In this ease no locking device is required, but the sleeve M50 is provided with an indicater P20, which in connection with suitable graduations Von the sleeve M20 shows the position of the valves.

An actuating mechanism, as hereinbefore described, common to the steam and water valves is applicable to valves of various construction and in connection with injectors, which also vary widely in construction, and the arrangement of the combining and delivery tube of the injector with reference to the other parts thus far described may be as shown in either of my former patents hereinbefore referred to, the said combining-tube and overflow-chamber being connected with the forward or delivery end of the casting B by a coupling or in any other suitable manner.

It is necessary in setting the injector in 1 operation that there should be an opportunity for the actuating fluid to escape readily into the atmosphere before the liquid has been raised and has condensed and combined with said actuating iiuid, and such escape is commonly provided for by leaving a space between the end of the combining-tube of the injector and the discharge-tube, which space is open to the atmosphere or to a chamber or space in the injector, which is itself open to the atmosphere and may remain open while the injector is in operation, although it is closed by a valve of some kind after the injector has been set in operation. This way of providing for the escape of the stealn before the combined jet has been formed is objectionable for several reasons, among others because thedischarge tube and passage leading from itrto the boiler often become filled with air while the injector is not at work, and such air owing to its elasticity is not readily dislodged or forced through such dis charge tube and passages into the boiler when the combined jet has been formed, but resists the entrance of the combined jet, thus de laying the starting of the proper operation of the in j ectorand causing much waste of water.

One of the objects of the present invention is to provide simple, compact, and efficient means for overcoming these objectionsv tothe usual form of overflow-chambers, and the devices forming the subject of this invention may be used in connection with any usual form of injector as an attachment thereto. As shown in this instance, the said devices are all connected with a shell or chamber b,

rounding the water-tube YB1 and a little larger than it, so as to afford an annular passage or opening which is the mouth or inlet to the combining-tube a3 of the injector when in operation and, if desired, might 'be extended forward inside the, shell'h to form a portion of the combining tube or nozzle. Preferably, however, said opening CL2 in the wall Ct terminates short of the end of the nozzle B4 or, rather, is flared out around the end thereof, as shown at a5, to form a seat for the end of the combining-tube a2, which is movable toward and from the said seat, as-will bedescribed. The shellbl contains both the overflow-chamber and the discharge-chamber of the injector, which in the construction shown in Fig. 1 are separated by a partial partition b2, having an opening b2, which may connect the overflow-chamber e at one s iderofgsaid partition and the discharge-chamber dat the other yside thereof, this construction being employed 4when it is desirable to have the overflow delivered laterally from the injector and the Water-delivery in line with thesinjector. The said overflow-chamber e is provided with a lateral outlet g4, Awhich may stand open to `the atmosphere, but is shown in Fig. l as provided with a stop-cock t, which may be closed in case it is desired to use the injector to blow back steam into the watersupply, as is sometimes done with injectors used on locomotives. g

The combining-tube a0 and delivery-tube t are herein shown as made in a single piece which is longitudinally movable in a guide g0, contained in the delivery-chamber d, being shown in Fig. l as formed in the dischargepipe cl2 of the delivery-chamber to which the IOO IIO

delivery-pipe leading to the boiler orielsewhere is connected, the said pipe d2 being shown in Fig. l as a separate piece screwed into the end of the shell b and the guide gi being connected therewith by arms Q7, which afford free communication between the spaces at the rear and in advance of the said guide. The piece containing theA combining-tube a3 is provided with a valve i2, that cooperates with the partition b2 to close the opening b3 therein when the said combining tube is moved rearward to the seat a5 in the opening a2, at which time communication between the the steam-space in the casting B and the interior of the overflow-chamber is cut off` by the end piece a and combining-tube as and communication between the overflow and delivery chamber is cut olf at b2 i2.

The combining-tube a? is preferably acted upon by a light spring r, which tends to throw it forward to the position shown in Figs. l and S,in which position the passage a2 opens freely into the overflow-chamber. The operation will be described after first describing .the modifications in construction shown in Figs. 8, 9, and 10, which are identical in their operation with the construction shown in Fig. l. Fig. 8 shows the parts in the position occupied when the injector is not working and when the overflow is open, so as to permit free action in starting the jet, and Fig. 9 shows the same parts in workin g position occupied while the jet is being delivered from the injector. In this construction the oVerow-outlet g4 is at the end of the injector and the deliveringoutlet di" is at the side of the injector and is integralwith the shell b, that contains the overiiow-chamber e and delivery-chamber d. The partition b2, that separates the overflow and delivery chambers and vis provided with the connecting-passage bias before described, is extended in the form f atube b4 inside the shell b, so that the overflow-chamber e is in the form of an annulus surrounding the delivery-chamber d instead of said chambers being end to end, as in the construction shown in Fig. l. The lower end of the annular partition b4 is engaged by a pocket or cup-shaped piece g, which surrounds the orifice of the del an injector having a movable discharge-tube working in a delivery-chamber and having a valve which closed communication between livery-tube t and completesA the wall of the delivery-chamber cl, and in this construction the guide g(i for the combining and delivery tube and the supporting-arms g7 of said gui-de are made integral with the cup-piece g or end portion of the delivery-chamber. The said pocket or end piece g is vheld in tight engagement with the end of the partition b4 by a coupling h, which, as shown in Figs. 8 and 9, has the overflow-outlet g4 made integral with it, suitable passages h2 being formed to conneet the overflow-chamber @with said outlet g4. The construction shown in Fig. l0 is the same as that in Figs. 8 and 9 and is marked with the same reference-letters, the only difference being in the shape of the casting g forming the end piece of the delivery-chamber and that the overflow-outlet g4 is cast with the said end piece g instead of with the coupling-nut h. The passages h2, that connect the overflow-chamber e with the outlet g4, are formed in thcpart of said casting that lies below the partition b4 and at the sides of the pocket g and above the engaging flange of the coupling-nut h.

The operation is as follows: When the injector is not working, the combining and discharge tube a3 i is in the position s hown in .full lines, Fig. 1, andin Fig. S, and the steam,

air, and water issuing from the water-pipe B4 pass freely into the overflow-chamber e and escape through the outlet g4 into the air, as does also'any steam that may at this time pass through the passages B5, so as to escape through the annular passage a2 around they end of the water-tube B4. As soon, however,

v'as the draft of water is established, so thata jet issues from the water-tube B4, it passes through the coi'n'bining-tube and enters the delivery-chamber d and, meeting back pressure therein, tends to flow back through the opening h3 into the overflow-chamber, in

which operation its pressure reacts upon the combining and discharge tube and valve e? thereon and moves the said parts ,in opposition to the force of the spring r until the said parts bring up on the seats at a5 and b2, as shown in Fig. 9, when all further communication is cut off and the injector can deliver only through the combining-tube, a3 and delivery-tube c' in to the delivery-chamber cl and thence through the delivery-passage d2, and this condition will be maintained as long as the injector remains working to deliver a jet under pressure. If at any time the injector should fail to operate, owing to a failure of the water-supply or for other cause, the combining-tube will'fall back and the steam will be delivered through the overflow-chamber and, escaping from the overflow-discharge,

i would show that the injector was not working properly, or, if failure of the water-supply were but momentary, the parts would resume their normal working position (shown In my former patent, No. 390,031, I showed the delivery and overflow chambers when the 1 operation of the injector 'was fairly started, such movementalso bringingthe dischargetube into engagement with the orifice of the combining-tube, so as to cut olf the opening into the air at this usual point of overflowescape. By having the combining-tube itself, ora considerable portion thereof, movable, as shown in the present invention, the point of -overflow-escape instead of being at-the orifice IXO l in Figs. l and 9) as soon as water was again supplied. v

no w

or most contracted part of the combining tube is brought near the mouth or base thereof, so that a very free Overflow-opening is afforded, which greatly facilitates the starting of the operation of the injector.

The construction of the overfiow and de livery chambers shown in Figs. f) and l0 might be employed in connection with amovable discharge-tube coperatin g with the combining-tube, as shown in said Patent No. 390,031, where it is desirable to have the overliow-outlet at the end of the injector or to have the overflow-chamber substantially surround the delivery-chamber.

I claim-- I l. In an injector a steam-chamber, a waterchamber, and steam-nozzle leading from the former to the latter; a delivery-nozzle leading from said water-chamber, and steam-passage around the same, an overflow-chamber and discharge-chamber in advance of said delivery-nozzle from the water-chamber, and a movable combining and discharging tube having its mouth or inlet end in said overflowchamber and its delivery end in said discharge-chamber and being adapted when operated by the pressure in the discharge-cham-- ber to seat in and form a continuation of the steam-passage around the delivery-pipe from the water-chamber, and to thereby shut off communication between its mouth and the overow-chamber, substantially as and for the purpose described.

2. In an injector, the combination with the shell or body of the injector and a guide connected therewith of a yoke guided thereby and steam and water valves connected with said yoke and operating simultaneouslyin the movement thereof, substantially as and for the purpose described.

3. In an injector the combination with the main body of the injector of a steam-valve and water-valve and valve-stems therefor arranged parallel with one another, a yoke connecting said stems, and means for moving said yoke to simultaneously adjust said valves, substantially as described.

l. In an injector the combination with the main body of the injector of a steam-valve and water-valve and valve-stems therefor arranged parallel with one another, a yoke connecting said stems, and means for moving said yoke to simultaneously adjust said valves, and means for locking the said yoke to hold the valves in any position to which they may be adjusted, substantially as described.

5. In an injector the combination with the working parts of the injector proper of a steam-valve controlling admission of steam to operate the injector and the water-valve con trolling the flow of water through the injeetor and an operating-lever and connections between the same and the stems of the said valves whereby the valves may be simultaneously operated, substantially as described.

6. In an injector the combination with the working parts of the injector proper of a steam-valve controlling admission of steam to operate the injector and the water-valve controlling the llow of water to the injector and operating-lever and connections between the same and the stems of the said valves,

whereby the valves may be simultaneously operated, and means for locking the said lever to hold the valves in different positions, as set forth.

7. The combination with an injector of an I and cooperating with the opening connecting the discharge and overflow chambers, substantially as described.

8. The combination with an injector of a shell surrounding the end of xthe combining-4 tube of said injector, and an"inner chamber within said shell having an outlet-passage and an opening connecting it with theinterior of said shell which contains a passage by the side of but disconnected from the said inner chamber and a removable end piece as g, that forms a portion of said inner chamber and a discharge-tube in said inner chamber provided with a valve as 712 controlling the opening between said inner chamber and 'outer shell, substantially as and for the purpose described.

9. The combination with an injector, of a shell around the end of the combining-tube of said injector and an inner chamber Within said shell having a lateral outlet-passage and arranged to provide a passage between it and the said shell; an end piece as g which when attached to the shell closes the lower end of the inner chamber and affords an outlet-passage from the shell around said inner chamber to the air, a guide as g6 supported on said end piece, and a discharge tube and valve working in said guide, substantially as and for the purpose described.

10. The combination with the working parts of an injector of a water-inlet and the sliding valve K controlling the flowofwater therethrough to the injector and provided With an opening K3 aording a minimum inlet for the water when said valve is otherwise closed, substantially as described.

ll. In an injectorthe combination with the working parts of the injector proper, of a steam-valve controlling admission of steam to operate the injector and water-valve controlling the flow of Water to the injector; the operating-handle and connection between the same and the said steam and watervalves; the pawl and locking-bar for governing the position of said handle, and the paWl-lifting rod extending through and accessible at the end of said handle, substantially as described.

12. An injector having a steam-chamber, a water-chamber, andno'zzle leading from the former to the latter, a delivery-nozzle from said water-chamber and combining-tube having its mouth or inlet-opening around the said delivery-nozzle combined with the main valve controlling admission of steam to' the IOO IIO

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first nozzle, a secondary valve governing admission of steam through passages around the first nozzle to the mouth of the combiningtube, and engaged and operated by the said main valve, as described, and a spring acting on said secondary valve With a tendency to close the same, substantially as and for the purpose set forth.

13. In an injector the combination of the main and secondary steam-Valves controlling admission of steam to the injector, and a Water-chamber and Water-inlet, and valve K, controlling the passage of Water therethrough to the in j ector,v said valve being provided with an opening K3, affording passage for the water when the main steam-Valve is open, substantiall'y as described.

to operate the injector, the water-inlet having i a rectangular port-,opening and the slide-valve Working on said port-opening and connections between said slide-valve and the steam-Valve of 'the injector, whereby said valves may be operated simultaneously, substantially as described. y In testimony'whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WM. T. MESSINGER. Vitnesses:

Jos. P. LIVERMORE, M. E. HILL.

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