US1368272A - Fuel-injector for locomotive-stokers - Google Patents

Description

V 'N. M. LOWER. FUELJNIECTOR FOR LDCOMOTIVE STOKERS,

" APPLICATION man AUG-19.1915.

1,868,272. mm Feb. 15,1921.

' 2 SHEETS'-SHEET1C N. LOWER. FUEL INJECIOR FOR LOCOMOTIVE STOKERS.

APPLICATION FILED AUG-19,1915.

1,368,272. Patented Eeb15,1921. F H3 7 2 SHEETS-SHEET 2. I

4 4 I 3f I -1-55355555-31-1-3 #1 K I. I?! a" L 2 2 a g "I gave E B I E I I o. l--l--. V I L mp 10 forcibly injecting fuel into and distribut- NATHAN 1VL LOWER, F SCHENECTADY, NEW YORK, ASSIGNOR TOgLOCQMOTIVE STOKER COMPANY, or! PITTSBURGH, PENNSYLVANIA.

PENNSYLVANIA,- A. CORPORATION OF FUEL-1N3 ECTOR FOR LOCOMOTIVE-S'I'OKER$.

Specification of Letters Patent. Patented Fell), 15, 19,21.

, Original application file'zl october 16, 1912, Serial No. 726,108. Divided and this-application filed August 19,

1915. Serial To all whom it may concern:

Be it known that I, NATHAN M. LOWER, a citizen of the United States, and a resident of Schenectady, in the county of Sche: nectady and State of New York, have invented a new and useful Improvement in Fuel-Injectors for Locomotive-Stokers, of which the following is a specification.

This invention relates to Stoker mechanism, and particularly to mechanism for ing it inthe fire box. The object of the invention is to provide improved mechanism of the type described which is eflicient in operation, which is simple in construction and is not liable to easily get out oforder, which is readily controlled and operated, which injects the fuel by a sudden impulse so as to deliver all of the charge to the fire box, and which scatters the fuel laterally so as to distribute it uniformly over the fire and cover its back corners and sidesas well as its central portion. Further objects of the invention are in part obvious and in part will appear more in detail hereinafter. The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the drawings, Figure 1 represents a longitudinal elevation through one form of apparatus embodying the invention; Fig. 2

is a sectional plan view, on a, larger scale, on the line 2-2, Fig. 1; Fig. 3 is a cross section on the line 3--3, Fig. 2; Fig. 4 is a detail view of certain valve mechanism; Fig. 5 is a sectional view through the valve mechanism for supplying fluid pressure to 'the plunger cylinder; Fig. 6 1s a sectional view, taken on the line 6-6 of Fig. 7, of means for controlling fluid pressure of the valve mechanism, on an enlarged scale; and Fig. 7 is a sectional elevation showing a portion of one form of locomotive stokcr mechanism to which the invention may be applied.

This application is a division of my prior application for locomotive stoker, filed Octobei 16, 1912, Serial No. 726,108, and claims only the mechanism for 'feeding or injecting the fuel into and distributing it in the fire box. The furnace and the me ger mechanism for delivering the fuel 'to t'he feeding or injecting device form no part Referring to the drawings, 1 illustrates.

the front wall of the fire box, which may be. the fire box of the locomotive or any fur nace to which the invention is applied. suitable number of fuel injecting devices 1 may be applied to the firebox, either a single injector at the center of the wall 1 or two or more thereof located above or below;

the usual hand firing door or doors (not) .1

shown), as will be readily understood.

Each fuel injeotorcomprises a hollow cylindrical casing 2 provided, with a laterally.-

extending portion 3 through which the fuel.

is delivered to the casing in any suitablemanneigeither .by hand through a doorway closed by a cover 4:, or automatically through an opening 5 communicating with the fuel transfer and conveying mechanism leading from the ply bin. v

The fuel falls in front of the head 6 of a. hollow piston 7 which slides in the casing tender or other fuel sup- 2 and is forcibly impelled toward the fire box to inject a charge of. fuel; thereinto. Said head is provided with a forwardly ex:

tending scoop or shovel member 9 traveling I ceives the fuel and carries it-during the for in the bottom of the casing 2 and which reward movement of the-piston. The casing 2 is provided with a passage 10 communicating with a source of fluid pressure, such as a steam or compressed air supply pipe 11. a bald passage, at its other end, communicates with a space 12, within a hollow cylin der or pipe 13 attached at its outerend to a cap: or cover 14 closing the outer end ofJ-the casing 2 and provided at its inner end with a circular head or wall 15 provided with apacking 16 on which the cylindrical piston 7 travels. The head 6 of said piston, in its retracted position, seats against an annular surface 17 at the outer end of the pipe 13 and head 15, so as to restrictxthe areaof the back of the head 6 against which the fluid pressure is effective in initiating the piston :troke. The piston is provided at its 'outer end with a follower head I 18, .,.which"" is shaped to fit neatly into an'annular space and prevent a heavy blow or knock.

bearing against the outer face of the head (5, so that pressure is confined against a limitedt irea at the center of the piston, to start the piston stroke, but as soon as the piston has moved forwardly slightly the fluid. pressure is admitted to a larger area on the outer face of said piston, whereupon said piston is moved forwardly with a sudden impu-lse to the end of its stroke, or until the follower head 18 reaches the cushioning space 19. The passage 10, the hollow space in the cap or head 14, and the space 12 within the tube 13 form in effect a reservoir in immediate proximity to the piston or plunger, so that as soon as the latter begins to move, the expansive power of the fluid pressure in this reservoir produces a very rapid movement of the piston.

' 'Within the hollow space 12 is located a tension spring 20 connected at one end to the'head 6 and at its opposite end to a. plug 21 threaded on an adjusting screw 22 extending through the wall of the cap 14;

This spring returns the piston and scoop to initial position after delivery of each charge of fuel to the fire box, it being understood that at thistime the space 12 is open to exhaust through the valve mechanism controlling the supply of compressed air to the device.

To assist in distributing the fuel lateraliy over the fire bed the piston is provided with one or more laterally movable members, shown as a pair of wings orvanes 25 pivotally mounted upon short shafts 2(3-cai'ried by the scoop or shovel 9 and located at opposite sides of the central longitudinal axis of said shovel. Thes'ewings or vanes are provided with outwardly extending short arms 27 whose ends travel in grooves or slots 28 in the side walls of the :asing 2, the ends of said grooves or slots, marked 28, 28", forming abutments to engage the arms 27 and move the wings or vanes laterally. The vanes 25 are curved, as shown in Fig. 2, thus providing curved fuel impelling facesfwhich have the effect (when said vanes arrapidly oscillated) of preventing the fuel f gom sliding endwise of the vanes, but. impeding aconsiderable part of the fuel sidewise andjdistributing-it with a sweeping motion along the sides of the fire box, from the front to the rear thereof.

During the delivery of the fuel to the injecting device the wings or vane? 25 occupy the positions shown in full lines in Fig. 2,

'and all or a portion of said fuel is delivered to the scoop .or shovel 9 on the outside of said. wings or vanes.

At the end of each inward stroke of the piston the vanes 27 engage the abutments 28 and oscillate said vanes outwardly around their vertical axes, thereby impelling a portion of the fuel outwardly and distributing it to the sides of the fire box. The outward swinging movement of the vanes 25 is stopped by said vanes striking the ends of the side portions of the shovel 9, which latter therefore serve as limiting stops for the vanes to prevent them from swinging around far enough to strikethe end wall of the fire box. The inward motion of the piston also throws the fuel inwardly into the fire box, so that some of it at least is delivered to the far back corners of the fire box. 011 the return movement of the piston the wings or vanes 25 engage the inner end of the casing 2, or thewall of the tire box, which oscillates s'aid wings or vanes to their inner positions, the movement being completed by the engagement of the arms 27 with the inner abutments 28". In some cases it may also be advisable to assist in lateral distribution of the fuel by means of a jet or jets of fluid pressure. For this purpose, as illustrated, the Head (3 of the piston is provided with a longitudinal passage 30 in which is located a valve 31 controlling a side passage 32 in the wall 'ofa pipe or tube 33 extending to the inner end of the scoop or shovel 9 and having lateral branches 3% arranged to deliver two lateral of fluid pressure in opposite directions. The pipe or tube 33 is shown as an integral 'boss or enlargement of the .scoop or shovel 9.

As soon as the piston head (3 leaves its seat 17 fluid pressure expands into the space between. the heads (3 and 15 and enters the passage 30, traveling through the side passage 32 beyond the valve 31 and being dischar ed through the side branch passages 3.4;. The valve mechanism for controlling the supply of fluid pressure to the injector is usually arranged to vary the rate of 'supply of the -fluid during different strokes. so as to produce lightand heavy impulses of the piston. the supply of fluid pressure. is slower, and is insuflicient to force the valve 31 to its seat against the action of its spring 35, which normally holds the valve against a stop 36. ()n heavy strokes of the piston, however,

. when a larger supply of fluid pressure is de livered, to the piston the higher pressure forces said valve to its seat, as shown in Fig. 1, which closes the end of the passage 32 and cuts off the steam supply to the pipe 33. The fluid pressure supply is therefore eflective only on light strokes of the piston and is valuable indistributing the fuel to the sides and at the front of the fire box.

One form of suitable. valve mechanism for controlling the fluid pressure to the injector so as to produce light and heavy strokes. is illustrated and described in my prior ap plication Serial No 7265108 and is illus trated, described and claimed in my co-pending application Serial No, 46 336 filed si multaneous of said up tion serial No. TBS-J08.

Said valve mechanism, and the control mechanism therefor are illustrated in Figs. 5, 6 and 7. This "alve mechanism comprises a hollow casing 4-2 which may be connected to or continuous with the casing 2. In the casing 42 is a chamber 43 in which is slidably mounted av'alve member having a stem 44 and two healdt' 45 each provided with a small through leak port 46. Pressure is supplied to the chamber 43 ,between the heads 45 tl'iroughthe port or open ing 11, from which it passes to the passage 10 through two ports or openings, marked 48 and 48 respectively, communicating with passages leading to the passage 10. The port 48 is preferably smaller than the port 48. The outer ends of the chamber 43 are closed by threaded plugs 49 having openings 50 therein, one of said openings communicating with a pipe 51'and the other with'a pipe 51. The sliding valve mechanism is 'normally held in central position by two compression springs 52 located between the plugs 49 and the outer ends of thepiston heads 45, and the tension of which springs may be adjusted by screwing the plugs 49 in or out as required.

Each head acts as a valve to cover or uncover its port 48 or 48, and the outward movement of said heads may be controlled by threaded stops provided with graduated heads 54 cooperating with pointers 55 to indicate the position of said stops: By

adjusting these stops the heads 45 will un cover the ports '48 and 48 more or less and thus enable the intensity of the different strokes of the piston to be varied.

"When the valve stem 44 and heads mov to the left in Fig. 5, the small port or opening 48 is uncovered, which allows pressure to flow from the inlet 11 to the passage 10 and thence to the fuel injecting piston, but the fluid pressure supply is restricted so that only a light stroke is produced. l l 'hen the valve head and stem move in the opposite y direction, or to the right, port 48 is uncovered, which allows a more rapid supply. of fluid pressure with 'a correspondingly heavy stroke.

The movement of the valve stem 44 and heads 4-5 may be controlled or produced in any suitable :rmumer but preferably by unbalancing the pressures on the outer faces of the two heads, either by diminishing the pressure effective on one head or by increasing that on the other. 6 shows one arrangement of mechanism suitable for this purpose, said mechanism comprising a cas in-g 57 preferably open to the atmosphere through a port 52', in which is located l herewith and. being a division a rotary shaft 58 carrying a worm 59 connected to a worm Wheel 60, the shaft 60 of which is journaled in oneside of the casing. One side of the casing is provided with an inwardly extending boss 61 contact ing with one side face of the worm wheel 60 and provided with athrough bore 61 communicating with a pipe connected to the space on the outer surface of one of the heads 45, and which may for example be the pipe 51. The other side of the casing 57 is provided with a rotatably adjustable member 62 whose inner end; contacts with haust the chambers 0n the outer faces of the heads 45. v c

When the passage 63 is out of register with both of the passages 61 and 62*, communication to the chambers on the outer faces of the heads 45 is closed except through the leak ports 46, so that pressure will build up in said chambers from the inlet 11. Each piston head is therefore sub jected to the pressure of a spring and to 7 equal pressure on its opposite faces, so that the valve mechanism shown in Fig. 5 lies in bentral or neutral position. Wheneverthe passage 63 in the worm wheel comes opposite one of the passages 61 'or 62 the chamber on the outside of the corresponding piston head is opened to exhaust, whichalloivs the pressure on the inner .face' of said head to become effective and move the valve, thus opening one or the other of the ports 48, 48 to the source of pressure. As soon as the passage 63 moves away from its opening the pressure again builds up behind the head 45 and moves the valve mechanism back to normal position. The fuel injecting piston 6 then returns to normal position under the influence of the spring 20, the pressure behind said p-iston being exhausted through a passage 64 in one of the pistons 45, which communi rates in normal position of the valve mechanism with a channel in the easing leading to' an exhaust opening 65.

The rotary member 62 is held against its face of the worm wheel 60 bya compression spring 66, which produces a tight seal between said worm wheel at the open ends of the boss 61 and member 62 and prevents exthe rotatable member 62 is diametrically opi 'posite the opening '61" in the boss 61, so that successive strokes of the fuel injecting piston are produced at uniform or regular in- ,tervals. Member 62, however, is provided said member in the proper direction the time interval preceding a light piston stroke may be made shorter than that preceding a heavy stroke or vice versa. This enables a larger quantity of fuel to be collected on the piston scoop before either the light or heavy stroke,

so that a larger proportion of the fuel may Ibo fed either to the front or rear of the fire The controlling device shown in Fig. 6 for the valve mechanism which operates the fuel injection piston is operated by a rotary shaft 58, which may be any suitable shaft on the locomotive. It may be hand-operated or operated by any suitable mechanism, but is especially adapted for connection to a locomotive stoker-mechanism operated by a rotary engine. For example, Fig. 7-sh0ws locomotive stoker mechanism ofthe same form illustrated in my prior application re ferred to, said mechanism being operated by a rotary engine which drives the rotary shaft 58 passing through the casing 57 of the controlling device. Said shaft is con nected to a longitudinally extending spiral conveyor 71 which conveys the fuel from the locomotive tender (not shown) to a position beneath tivo upstanding conduits 73 through which the fuel is elevated to the fuel inlets 5 of the fuel injecting cylinders 1. The elevating mechanism. comprises reciprocating bars provided with folding vanes, and is operatedby a connection to the shaft 58, in the same manner as insaid prior application, and therefore requires no further description.

The mechanism described is of simple construction and can be used with any type of stoker mechanism. It produces a thorough distribution of fuel in the fire box and promotes uniform consumption so that a maximum number of heat units are obtained from the fuel. It is automatic in operation so that no attention is required on the part of the operator, and is not liable to easily get out of order. I

What I claim is 1. Fuel injecting mechanism for stoker mechanism, comprising a broad vertically standing vane mounted to oscillate about a vertical axis and having its free end bent to provide a curved fuel impelling face, and

mechanism for imparting rapid oscillatory movement to said vane to distribute the fuel over the surface of the fire.

2. Fuel injecting mechanism for stoker mechanism, comprisinga pair of oppositely tribute the fuel over the surface of the fire.

3. Fuel injecting means comprising a reciprocable shovel, a vane pivotally mounted on the shovel for lateral oscillation over the floor thereof, and means for causing outward movement of the vane on the advance .stroke of the shovel.

4. Fuel injecting means comprising a reciprocable shovel, a pair of vanes pivotally mounted on the shovel for lateral oscillation over the floor thereof, and-means for causing outward movement of the vanes on the advance stroke of the shovel.

Fuel injecting means comprising a reciprocable s'hovel, a pair of vanes pivotally mounted on the shovel for lateral oscillation over the floor thereof, means for causing outward movement of the vanes on the advance stroke of the shovel, and means for causing inward movement of the vanes on the back stroke of the shovel.

6. F ucl in ecting means comprising a reciprocable shovel, a discharge nozzle having upstanding, side abut'ments adjacent its inner and outer ends, a shovel reciprocable in. the nozzle, a pair of laterally oscillatable vanes carried by. the shovel and movable over its floor, each vane having a lateral arm engageable with a pair of the abutments.

7.. Fuel injecting means comprising a reciprocable shovel, a pair of curved vanes pivotally mounted on the shovel for lateral oscillation over the floor thereof, and means for causing outward movement of the vanes on the advance stroke of the shovel.

8. In a stoker mechanism, in con'ibination, a feed plate, means for delivering fuel-to the plate, a curved vane pivotally mounted over the plate on a vertical axis, and means for turning the vane on its pivot to sweep the fuel from the plate and throw it into the fire-box of the furnace.

9. In a stoker mechanism, in combination, a feed plate, means for delivering fuel to the plate, a vane pivoted on a vertical axis over the plate, and means for turning the vane on its pivot to sweep the fuel from the plate, such vane having its outer end curved whereby the fuel is thrown laterally and baclnvardly.

10. Fuel injecting mechanism for stoker with 1,ees,272

move the vane about. its axis to distribute the fuel laterally, the opposite end of said slot being arranged to engage saidarni upon the return movement of said plunger to re turn the vane to its initial position.

l1.'-Fuel injecting mechanism for stoker mechanism, comprising a cylinder provided slots and having a power-operated plunger therein forimpelling fuel toward 7 a fire box, vanes-pivoted to said plunger ,having arms projecting into the slots in the cylinder, the ends of said slots being arranged to engage the arms on the vanes as the plunger reaches the end ofits forward stroke to move the vanes about their pivots to distribute the fuel laterally, the opposite ends of the slots engaging said arms upon the. return movement of the plunger to return the vanes to theirinitial position.

12. Fuel injecting mechanism, comprising acylinder, a power-actuated shovel therein, a vane pivotally mounted on the shovel for lateral oscillation over the floor thereof, a stationary abutment, and an arm on said vane arranged to engage said abutment as the. plunger moves forward to thereby swing the vane on its axis to scatter the fuel laterally over the fire. I v

13. Fuel injecting mechanism, com rising a cylinder, a power-actuated shovel t erein, a vane pivotally mounted on the shovel for lateral oscillation over the floor thereof,

an arm on said vane, a fixed abutment arranged to be engaged by said arm as the plunger moves forward to thereby oscillate the vane and-scatter the fuel over the fire, and a second abutment arranged to be engaged by the said arm on the return movement of the shovel to return the vane to its initial position.

14. Fuel injecting mechanism, comprising a. cylinder, a power-actuated shovel therein, a pair of vanes pivotally mounted on the shoved for lateral oscillation over the floor thereof, and means for oscillating said vanes .on their axes on the advance stroke of the shovel. j

15. Fuel injecting mechanism, comprising a cylinder, a power-actuated shovel therein for impelling fuel toward a fire box, a pair of broad vertically standing vanes pivotally mounted on said shovel on vertical axes, an arm on each of said vanes, a'butments arranged to engage said arms on the forward movement of the shovel and swing the vanes to scatter the fuel laterally over the fire, and abutments for engaging said arms upon the return movement of the shovel to return the vanes to their initial positions.

16. Fuel injecting mechanism, comprising a cylinder, afiuid pressure operated fuel injecting shovel therein,'and means carried by said shovel and arranged to produce lateral jets of. fluid. thereacross when the shovel moves inwardly, to distribute the fuel laterally.

17. Fuel injecting mechanism for stoker fluid supply to plunger strokes of varying intensity, and means on said plunger for producing lateral jets of motive fluid to distribute the fuel laterally.

18. Fuel injecting mechanism for stoker mechanism, comprising a cylinder, a fluid pressure operated fuel injecting piston movable therein, a scoop or shovel carried by said piston and arranged to receive fuel, and means on said scoop or shovel by which lateral jets of fluid are produced as the piston moves forwardly to thereby" distribute the fuel laterally to tlie sides of the fire box.

19. Fuel injecting mechanism for stoker mechanism, comprising a cylinder, a fluid pressure operated fuel injecting plunger therein, means for:-s ontr0lling the motive fluid supply to the plunger to produce plunger strokes of varying intensity, and means on the plunger for producing lateral jets of motive fluid upon light strokes of the piston to distribute the fuel laterally.

20. Fuel injecting mechanism for stoker mechanism, comprising a cylinder, a fluid pressure operated fuel injecting plunger therein, means for controlling the motive fluid supply to the plunger to produce plunger strokes of varying intensity, means on the plunger by which lateral jets of motive fluid are produced for distributing the fuel laterally, means on the plunger for venting the motive fluid in lateral jets to distribute the fuel laterally, and means for preventing said fluid being vented when the piston makes a heavy stroke.

21. Fuel injecting mechanism for stoker mechanism, comprising a cylinder having .a fluid pressure operated fuel injecting plunger therein, .means for controlling the motive fluid to said plunger to cause strokes of varying intensity, means by whichthe motive fluid for the plunger assists in the lateral distribution of the fuel, and valve mechanism for preventing the motive fluid bein' so used when it is bein su lied in such quantities as to cause a heavy stroke of the plunger. l l

22. Fuel injecting mechanism for stoker mechanism, comprising a power-operated plunger for impelling fuel toward a fire box, means for distributing the fuel latmechanical means for distributing the fuel laterally as the plunger reaches the end of its stroke, and fluid pressure means for assisting in the lateral distribution of the fuel.

24. Fuel injecting mechanism for stoker mechanism, comprising a power-operated plunger for impelling fuel towarda fire box, mechanical means for distributing the fuel laterally toward the end of the plunger stroke, and fluid pressure means for distributing the fuel laterally toward the end of light plunger strokes.

25. Fuel injecting mechanism for stoker mechanism, comprising a power-operated plunger for iinpelling fuel toward a fire box, mechanical means for distributing the fuel laterally toward the end of the plunger stroke, fluid pressure means for assisting in the lateral distribution of the fuel, and means for preventing operation of the fluid pressure distributing means when the piston makes heavy strokes.

26. Fuel injecting mechanism for stoker mechanism, comprising a power-operated plunger, means independent of the plunger operating means for distributing the fuel laterally as the plunger reaches the end of its stroke, and additional means for dis trihuting the fuel laterally under lignt pis ton strokes.

27. Fuel injecting mechanism for stoker mechanism, comprising a fluid pressure op erated plunger for iinpelling fuel toward a fire hox, means for regulating the supply of motive fluid to said plunger to cause strokes of varying intensity, means inde pendent of the plunger operating means for distributing the fuel laterally as the plunger reaches the end of its stroke, and fluid pressure operated means for assisting in the lateral distribution of the fuel when fluid pressure is supplied to said plunger to cause a light stroke thereof.

28. Fuel injecting mechanism for stoker mechanism, comprising a fluid pressure operated plunger for impelling fuel toward a tire box, means for controlling the motive fluid to said plunger to cause strokes of varying intensity,mechanical means on said plunger for distributing the fuel laterally toward the end of the plunger stroke, means by which the motive fluid for the plunger assists in the lateral distribution of the fuel, and valve mechanism for preventing the molivc lluid being so used when it is supplied in such quantities as to cause a heavy stroke of the piston.

29. Fuel injecting mechanism for stoker mechanism, comprising a fluid-pressure operated 'ilunger for impelling fuel toward a fire box, mechanical means on said plunger independent of the plunger operating mechanism for distributing the fuel laterally as the plunger reaches the end of its stroke, means for venting the plunger operating 30. Fuel injecting mechanism for automatic stokers, comprising a cylinder, a reciprocating injecting plunger having a rearward extension guided in said cylinder, a spring coaxial with and inclosed in said plunger extension and arranged to retract.

said plunger, and means for supplying fluid pressure to advance said plunger.

31. Fuel injecting mechanism for automatic stoker, comprlsing, in combination, a cylinder, a reciprocating injecting plunger having a rearward extension guided in said cylinder, a fixed tubular stem on the axis of said cylinder and its forward end fitting within the tubular plunger extension, a plunger retracting spring within said fixed tubular stem, and means for supplying fluid pressure .to advance said plunger.

32. Fuel injecting mechanism for automatic stokers, comprising a reciprocating fluid actuated motor, the moving part of said motor constituting an ejecting plunger, means for admitting fluid pressure to advance the plunger, and a spring housed within the motor and connecting the'movable and stationary parts thereof for retracting the plunger.

33. Fuel injecting mechanism for automatic stokers, comprising in combination, a cylinder, a reciprocating injecting plunger having a rearward extension guided in said cylinder, a fixed tubular stem on the axis of said cylinder and its forward end fitting within the plunger extension, a plunger retracting spring within said tubular stem, and means for supplying 'fiuid pressure through said tubular stem.

34:. Fuel injecting mechanism for automatic stokers comprising, in combination, a fuel injecting plunger, fluid pressure means arranged to advance said plunger suddenly,i-and a spring acted upon when said plunger advances and arranged to retract the same.

Fuel injecting mechanism for automatic stokers comprising, in combination, a, cylinder, a reciprocating injecting plunger in said cylinder, and a fluid inlet coaxial with cylinder and arranged to admit fluid initially to a, restricted area of said plunger and to a larger area of said plunger after it has moved slightly, whereby said plunger is advanced suddenly. t

36. Fuel in ecting mechanism for automatic stokers comprising, in combination, a

cylinder, a reciprocating injecting plunger j in said cylinder, a reservoir for a pressure fluid back of said plunger and in immediate proximity thereto, and an inlet from said reservoir to said cylinder arranged to admit fluid initially to a restricted area of adapted-t0 traverse said receptacle between said plunger and to a larger area of said plunger after it has moved slightly, Whereby said plunger is advanced suddenly.

37. In a mechanical stoker, the combination of a receptacle into Which fuel is demy hand. livered, a fuel carrying and throwing shove1 sure means for impelling said shovel forwardly, and mechanical means for returnmg the sald shovel to initial posltlon.

NATHAN M. LOWER.

positions in rear and in front of the avenue WVitnesses: of fuel delivery thereto, the said shovel be- CLYDE J. MQCURD ing adapted to pick up and carry a charge THOS. OARMEB.

of fuel in its forward traverse, fluid pres In testimony whereof, I have hereunto set

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