US2580372A

US2580372A - Control apparatus

Info

Publication number: US2580372A
Application number: US596765A
Authority: US
Inventors: Ralph T Whitney
Original assignee: Westinghouse Air Brake Co
Current assignee: Westinghouse Air Brake Co
Priority date: 1945-05-30
Filing date: 1945-05-30
Publication date: 1951-12-25
Anticipated expiration: 1968-12-25

Description

Dec. 25, 1951 R. T. WHITNEY CONTROL APPARATUS Filed May 5o, 1945 Patented Dec. 25, 195i y.?580;372 CONTROL APPARATS' Ralph T. Whitney, Irwin, Pa., assignor fo Westinghouse Air Brake Company,l a-corporation 'of Pennsylvania Application'May'Ii, 1945, Serial'No. 593,-'765 This invention relates tc'control apparatus and more particularly to a nuid pressure control apparatus for controlling, in a desired sequence, a plurality of diierent operations, 'such for e'X- ample, as operations incident to controlling the operation of a reversible internal combustion engine.'

yIn Patent No. 2,395,262,1iss'u'ed to Roy R. Stevens andEric GVErson, on February 19, 1946, lthere is disclosed a fluid pressure control apparatus which is operable automatically to control the starting, stopping and reversing'of an internal combustion engine in response toappropriate operations of a manual controller. Inreve'rsing the engine the apparatus operatesY automatically to 'rst cutoff the supply of fuel to the engine, to then reverse the valve timing or valve gear of the vengine :to provide for operation of the engine in the reverse direction, to next supp-ly startingair to the engine for causing it to start turning inthejnew direction, following which fuel isv supplied to the engine to Acause it to run in thenew direction.

The principal object'of therinven'tion is to pro'- vide an improved control apparatus of the kabove general type.

Other objects and advantageswilll be apparent from the following more detailedY descriptionV of the invention.

In the accompanying drawing: Fig." lis-a dia--l grammatic view, partly insection and partly in outline, of a controlap'paratu's embodying the invention; Fig. 2 is a partial plan view of -an oper-'- 8 Claims. (CI. 12S-41)V shiftable type lia-ving aio'rward position to vprovde for operation of the engine" in the one direc*-v tion and a reverse position to provide for o peration of the engine 'in `the opposite'directin. AIn'the drawing the cam shaft is shown in the reverse position and may beA shifted by a lever from this position tothe forward position in which' said Y lever may occupy v'af position such as indicated by ators control valvedevice shownY in vertical sec#` tion in Fig. 1; Figs. 3 and 4 are sectional views taken on the lines-3 3 and #-4, respective-ly', in Fig.- 1;and Fig. 5 is a sectional view, -on an Ven larged scale, o-f a directionalv control device shown in side elevation in Fig. land talen on aline 5-5 therein. 4

Description In the `drawing che reference numeral-.I indicates a portion of one end of acrank Vshaft cfa reversible internal combustion engine, and reference numeral 2 vindicates a portionof one end of a cam shaft for said engine. .The cam shaft ,2 may: be driven in proper phaseiwith the crank shaft I by meshinggears and A'll'zor operating conventional starting valve mechanisms and fuel injection mechanisms (not shown) in la 'wellknown manner tov permitthe' engine to-Abestarted by compressed air in eitherdirectien of rotation to, for instance, drive a shipeither ahead'rorastern.

Y To providefor the different directionslof operaa dot and dash line 5a` rihe*reference numeral 6 indicates a'ifu'el control shaft for the engihandrefere'nce numeral indicates an operating lever for said shaft. "The lever l and'shaft ii may-have `a'fuel-cuteolf position in which they'are sh'own in the drawing-fr cutting oif the supply4 of fuel to the engin'eto stop same, andiniay beadjustable out of Vsaid position to aiposition'such as' indicated-'bye dot and dash line '8' or to even a greater citent-to supply fuel'to the engine. g n y 'A fuel cutioi device Iis provided frfcn'- trolling' the positioning of the fuel Control level l. 'lh'is-device comprises a; casing containing a piston- II having at on'e side 'a pressure chamber I2 openw to a control pipe i3 andhaving'at the opposite'side a' non-pressure chamber' III. Projecting from piston ll thro-ugh the non-pressure chamber If'is a' piston rod l5 which may be provided at itsend with a slot in which there is disposed a'pin AI E providedin the Vfuel cut-olf lever L rhe' non-pressure chamber" I4 vcontains a spring Il which encircles the rod I5 and acts on, the piston II for urging saine' in the-"direction of the left hand away from a sto-p shoulder-I8;V Movement of piston I I in the direction of the left hand is arranged to he limitedfby-'contact between the piston II and a stopl I9. Upon supply of fluid under pressure to pressure chamber I2the yforce createdon pistonl II will cause the piston II to move the'fuel cut-off lever I to its' fuel cute-off position in which it is shown in the drawing. Upon release' offluid under pressure'fromV chamber I2 the spring` I' will movey the piston into contact with stop it 'andfthis movement transmitted through the pistonrod- I5 will turn'or permit movement off the fuel control lever 'I from thel fuel cut-off position t'o the position indicated by' theV dot and dashy line 8v for supplying fuel to the engine;

The reference numeral 22r indicates a starting air valve'l devicearranged to operate upon supply of rfluid* under pressure to a control pipe 23 for supplying starting air' froma startingair supply pipe 24 toapipe 25 which may convey' the air to the-starting valves l(nottshown) of the A"engine forsupplyitothe engine cylinders' (n'otsl`1ov`vn)V to place the engine in motion in the direction determined by the position of the cam shaft 2.

The starting air valve device 22 comprises a supply valve 25 arranged to control communication between

pipes

24 and 25, a release valve 2 for controlling communication between pipe 25 and an atmospheric port 28, and a piston 29 for controlling said valves. At one side of piston 23 is a chamber 30 open to pipe 23, and at the opposite side is a chamber 3| open to atmosphere through port 28 and containing a spring 32 under pressure acting on said piston. In operation, when fluid under pressure is supplied to pipe 23, in a manner which will be later described,

such pressure will become effective in chamber 35 and actuate piston 29 to close valve 2'! and open valve 25 to thereby supply starting air from pipe 24 to pipe 25 for starting the engine. When rid is released from pipe 23and thus from chamber 3l), spring 32 will return piston 29 to the position in which it is shown in the drawing to thereby open valve 2l and to permit closure of valve 2S by a spring 33, so as to cut off the supply of starting air to pipe 25 and to release air from said pipe to atmosphere. The control of the supply and release of fluid under pressure to and from pipe 23 will be hereinafter described.

A fluid reversing motor 35 is provided for shifting the cam shaft 2 to its two different positions above described. This motor comprises a cylinder 35 containing apower piston 31 which is operatively connected through a piston rod 38 and a link 33 to the free end of the cam shaft shifting lever 5. At one side of the power piston 31 there is provided a pressure chamber 45 while at the opposite side is another pressure chamber 4 I. Upon supply of fluid under pressure to chamber 4D, when fluid under pressure is released from chamber 4I, the piston 3T will be moved yto the position in which it is shown in the drawing for operating lever to move the cam shaft 2 to its astern position in which it also is shown in the drawing. On the other hand, if iiuid under pressure is supplied to chamber 4I when fluid is released from chamber 40, the piston 31 will move to the` opposite or right hand end of cylinder 36 to thereby actuate lever 5 to move the cam shaft 2 to its ahead position in which the lever will occupy the position indicated by the dot and dash line 5a.

The supply Yand release of uid under pressure to and from chambers 45 and 4I is adapted to be controlled through, respective1y,'astern and ahead pipes 43 and 44 which connect said chambers to a directional interlock device 45. Reference numerals 43 and 4i indicate respectively astern and ahead control pipes which connect the directional control valve device 45 to an operators contro'l Valve device 48.

The reference numeral 48 indicates a double check valve subject on opposite ends to pressure of fluid in the ahead and astern pipes 44 and 43 respectively, and which is arranged to control communication between said pipes and a third pipe 5I) leading to one end of another double check valve 5I. When fluid under pressure is supplied to pipe'43, as will hereinafter be described, such pressure, effective on the right hand end of the double check valve 49, will shift said check valve to the position shown in the drawing for opening pipe 55 to pipe 43 and for closing communication between pipe 50 and pipe 44. On the other hand if fluid is supplied to pipe 44 when pipe 43 is vented, thedouble check valve'43 will move to an opposite position for closing communication between pipes 54 and 43' and for opening pipe 5l) to pipe 44.

The opposite end of the double check valve 5I is subject to pressure of fluid in a pipe 52 which leads to the operators control valve device 48, and said check valve is arranged to control communication between the pipes 53 and 52 and pipe I3 leading to pressure chamber I2 in the fuel cut oi device I3. As will be apparent, if fluid under pressure is supplied to pipe 52, when fluid is released from pipe 50, the double check valve 5I will disconnect pipe I3 from pipe 50 and connect pipe I3 to pipe 52, while if uid under pressure is supplied to pipe 55 when pipe 52 is vented the double check valve 5I will move to its opposite position for opening pipe I3 to pipe 50 and in which pipe I3 will be disconnected from pipe 52.

The directional control device 45, as shown in detail in Fig. 5, comprises a casing containing an astern interlock valve device 55 and an ahead interlock valve device 55. The two valve devices 55 and 53 are identical in structure each comprising a supply valve 5l contained in a chamber 58 and arranged to control communication between said chamber and a chamber 53. A spring 65 in chamber 58 acts on the supply valve 5l for urging it to its seated or olosed position. Each supply valve 5l is provided with a stem (il extending through chamber 59 and connecting said valve to a plunger 62 provided at the opposite end of the stem. It will be noted that chamber 59 in each of the

valve devices

55, 55 encircles the stem 6I, and that the plunger 52 is mounted to slide in a bore constituting an extension of said chamber. The chamber 53 is therefore arranged at one side of plunger 62 while at the opposite side is a chamber 63 which is in constant communication with atmosphere through a port 64. A release valve 65 contained in chamber 63 is arranged to seat against the end of plunger 52 for closing communication between said chamber and an axial bore S6 ex-tending through said plunger and the stem 6I and supply valve 5'1 and opening to the Supply valve chamber 58. Each release valve 65 is carried by a stem 61 which extends through a bore in the casing to the exterior thereof.

The two release valve stems 6'! are disposed at opposite sides of a pin 68 which is carried in a lug 69 depending from the casing- A lever l0 is fulcrumed on pin 58 and is provided with two oppositely arranged arms 'II one disposed over the end of each of the release valve stems El for engagement therewith. The lever 'i5 is also provided with a third arm 12, the end of which is loosely accommodated in a slot 73 provided in and open to the periphery of a friction disc 74. This disc is carried on one end of a plunger 'I5 (Fig. l) which is slidably mounted in a bore provided in a casing 76 which is rigidly supported with respect to the engine so as to support the friction disc in coaXi-al relation with the end of the engine crank shaft I. The plunger 'E5 is also eiective in the capacity of a piston for moving the friction disc into frictional contact with the end of the crank shaft I, and to effect such movement there is provided at its inner end a pressure chamber 'I1 which is open to the starting control pipe 23. v

Rotation of the engine crank shaft I and thereby of the friction disc 'H4 in a coun-terc'lockwse or astern direction as indicated by the legend Astern in Fig. 5 ofgvthel drawing, Ywill `rock the lever 'Illv about the fulcrum pin 53 in a clockwise direction to thereby-move the left hand lever arm Il into contact with the release .valve stem 61 in the interlock valve device 55.

thev release valve 55 in the interlock valve dev ice 55 against the respective plunger 62 forclosing communication between chamber 58-and cham-` ber 63. Further movement of thelever 'I5 in a clockwise direction will then act through the release valve 65 in the interlock valve device 55 to shift the plunger S2 .and open the respective.

supply` valve 51 so as to establish communication between chambers 59 and 58. When the inter look valve device 55 is operated as just described, the parts of the interlock valve` device 55 will assume the position in which they are shown in thev drawing and in which the respective supply valve 51 is closed and the respective releasevalve 55 is open. If the crank shaft I and disc fidare turned in the opposite or aheadv direction as vindicated by the legend Ahead in Fig. 5, the lever' 1|] will be rocked in a counterclockwise direction to thereby eect operation of the interlock valvev device 56 to close communication between the respective chambers B and 63 and to open said` chamber 58 to the respective chamber 59,'.while in the interlock valve device 554 ther respective supply valve 51 will be closed and the release valve 65 open.

A spring 19 having one. end connected to a pin 8|! secured in the lug 65 above the fulcrum pin 68 has its opposite end connected to a pin 8|.Secured in the end of lever 12. In the position in which lever isv shown in the drawing the |line of action of spring 15 is at one side of the .axisof pin 68 while in the opposite position of said lever, above described, the line of action of spring 19 will be at the opposite side of the axis of pin 68. This spring is under tension and its purpose is to resiliently hold the lever Ideither in the position in which it is shown in the drawing or in its opposite position after movement by disc 1li.

In the astern interlock valve device 55 chamber v .58 is connected to pipe 55 and chamber 59 is connected to pipe 51, while in the ahead interlock Valve

device 5S chambers

55 and 59 are connected, respectively, to pipes @3 and 45.

The operators control valve device v53. 4comprisesv a body 83 and a cover all mounted on said-body. In body 33 there are disposedwhat may be called an ahead valve device 35andan astern valve device 35 for controlling operation of the reversing motor 35 to select the direction of operationof the engine.

control valve device 45, anda stop valve device 88 for controlling operation of the fuelcut-off. device to. efect stopping; oi the engine when4 desired.

The ahead and astern valvedevices 85', and 86.-

and the stop valve. device B8 .are arranged in spaced parallelrelation with their axes shown diagrammatically in the same plane, while the start valve device 81`is arrangedwith its axis also in said plane but at right anglesto. the Vaxesof the other valve devices.A n

VAll of the valve. devices k85,.85, 81.and 88 may be identical inconstruction, each'comprising'afluid pressure supply valve 9U, contained ina chamber QI and arranged to controllcommunication between said chamber and a chamber 92- through an opening encircledby a seat provided.v for engagement by said valve 'to closesaid. com-` munication. A spring 93 .in chamber- QI'acts on valve 95 Vfor urging itintocontact wilhfitsseal'pr The valve 90is connected. by.y atstem. which..

Further. movement of said lever arm will then actto seat The body 83 also contains a. start. valve device 51 for controllingv operation of the. starting air va'lve device 221 and the directionaly loosely extends through the -v-alvels'eatto a plugr 95 whichlisfslidably mounted in asuitable boreffin.. the body, said plunger. being Aof substantially the. sameareaasthe seat of `valve 90 andesubject von.. one face to. pressure ofvv fluid infchamber-92 and on theopposite'faceto atmospheric pressure in` a chamber Sawhich is-open toatmosphere byway of a passage; 91. Thevalve 95, stem 913` and plunger-95 are provided with an axial bore 98- open atoneendto chamber 9|,.and a:release valve.99` disposedr in chamber 96V is arranged to` control. communicationbetween theopposite end of said bore andrthelatter chamber.. Thereleasezvalve. Qillisprovided with a plunger. |00 extendingto thev exterionof the body. n

The'- chamber y92v in all of the. valvey devices 85,..y 8'6; 81.' and 88 is connected directly'to affluidpresf sure 'supplyv reservoir I0-I and thus arranged to'be constantly supplied with fluid under pressure. when the system is.inuse.. Chamberv 9| inthe ahead and astern valve devices 85 and S-areconnectedrespectivelyto pipes IHv and Ill'leading to. thedirectional. contro-l device .45. Chamber. 9 I in v thestart valve device. 81. is connected tofa start.-v ingr control pipe |02; while chamber'ill inthe stop valve device 88 is connectedto pipe52 leading toI theone end of the double .check-valveSI.

o ent-,operatingpositions in the fslotsil I2,...I I3: an'c'tl.l

over.. andsecured. to the'controlshaft |03 and bears. atoppositeI ends against the coverill for holdingboth shafts against axialmovement.- I

TheV two shafts |03v and |55- are providedwith aligned longitudinally extending slots and the` plunger. |54 is. provided with a like slot and through these slots extends the lower end portion of an operators control lever IIVI whichis pivotally mountedonapin |08 carried'byfa lug' |69 projecting upwardly from the cam shaft |05.y In the lower end rof portion |06 of the operators control'lever is a slot I I0 within which is disposed a transversely extending pin I I I which is secured, to plunger |64. It will be seen thatrocking of: the operatorscontrol lever I|l1 about the pin. |58. in a direction longitudinally of the cam shaft |05: will shift the plunger Ille' lengthwise within the: control shaft Ia'I3,.wliile movement of .said lever in a direction about the axis of said cam shaft. will rotate said cam shaft without effecting end'.-v wise movement of plungerl |14.

The operator-s control lever IIJ'I extends. through a guide slot in cover-84 which provides av delinite path of movement of said lever.` This slot' is shown in plan in Fig. 2 of the drawing and" comprises a main portion I I2 arranged to permit movement-oflever IIN-'inthe direction circum-Y ferentiallyv ofthe cam shaft I I8. One endV of slot. I|2A opens :to a short slot II3.arrangedfat-right angles to the slot. I I2, while at the Aopposite end of* slot II2 is another short slot I I4 extendingin the-y same direction and parallel to slot' I I3: The'slots"A II3 andV IIII provide for movement of the oper-'f ators'control lever yIIII about thefulcrum pin |08` for moving theplunger |04 outwardly and.. in.-

wardly ofthecontrol shaft |03.`

The Operators controlrlcver |01 has 'five 'diierel H4 including a Stop position intermediate the ends of slot H2, in which position said lever is shown in Fig. 2 of the drawing. At the end of slot H2 adjacent the short slot I I3 the lever has a "Run position, while at the opposite end of slot H2 said lever has another Run position,

and at the outer end of each of the slots |I3 and II4 said lever has a Start position. These positions are indicated in Fig. 2 by appropriate legends, and it will be noted that beyond the short slot H3 is the legend Aheadj while beyond the short slot I I4 is the legend Astern, which indicate the different directions of engine operation. The Start positions in slots I I3 and H4 are for starting the engine in the ahead direction or the astern direction, respectively, while the adjacent Run position is that in which the operators control lever will be carried while the engine is running after being started, as will be hereinafter described in greater detail.

The body 83 of the operators control valve device has an exterior lug H6 disposed between plunger of the start valve device 81 and plunger I 04 which is slidably mounted in the control shaft |03. A lever I I1 fulcrumed intermediate its ends on a pin H8 carried by the lug H6 has one end in contact with stem |00 of the release valve 99 in the start valve device 81, while its opposite end is operatively connected to the projecting end of plunger |04. With the operators control lever in slot H2, lever ||1 and the parts of the start control valve device 81 will occupy'the positions in which they are shown in the drawing, in which the start control pipe |02 is open to atmosphere past the respective release valve 99. Movement of lever |01 into either one of the short slots H3 or H4 will however operate plunger I 04 and lever I I1 to rst seat the release valve 99 and then open the supply valve 90 in the start valve device 81 for thereby supplying iiuid under pressure from chamber 92 to the start control pipe 102.

The cam shaft |35 is provided with three cams |20, I2! and |22, the peripheral surfaces of which are arranged to contact plungers |00 of the valve devices 85, 8l and 38, respectively, for controlling operation of said devices. The cams and I2! are of identical structure but are reversely arranged on the cam shaft |65. The cam |26 is so designed as to effect closure of the release valve 99 and opening of the supply valve 90 in the ahead valve device 85 when the operators control lever I91 vis in the Ahead Run and Start positions and to permit closing of said supply valve and opening of said release valvel in all other positions of said lever. The cam 12| is operative to close the release valve 99 and to open the supply valve 90 in the astern valve device 89 in the Astern Run and Start positions of lever |31 and to Apermit closure of said supply valve and opening of said release valve in all other positions of said lever. The cam |22 is so designed as to effect closure of the release valve S9 and opening of the supply valve 30 in the stop valve device 88 only in the Stop position of the operators control lever |01 and therefore to permit closure of said supply valve and opening ofI said release valve in all other positions of said lever.

Pipe |02 connected to the start valve device S1 leads to a reversing interlockl valve device |26' 8 through the housing |28 and is supported in a bore through the outer end of said housing.

The housing |23 is provided at one side of the piston rod 38 with a bore in which is slidably mounted a ball |39 having contact with the peripheral surface of said rod. Engaging the opposite side of ball |39 is one end of a plunger Iili which is slidably mounted in the bore in the housing, while engaging the opposite side of said plunger is a stem 4| projecting from the release valve |31. The piston rod 32 is provided with a slot |42 arranged to receive the ball |39 to permit movement thereof and of plunger |43 and of the release valve |31 in a direction away from plunger |34 to permit unseating of said valve from said plunger with the supply valve |3| in contact with its seat under pressure of spring |32. The slot |42 is of such length as to displace the ball |39 out of said slot in both extreme positions of the power piston 31 but to permit movement of the ball into said slot in all positions of said piston between said extreme positions. With the ball |39 displaced out of slot |42 it is adapted to seat the release valve |31 against the plunger |34 and to move said plunger to a position in which the supply valve |3| will be opened.

Operation.

In operation, let it be assumed that the operators control lever |01 is initially in Stop position effecting operation of the ahead and astern Valve devices and 80 and of the start valve device 81 to open the respective pipes 41,l 45 and |02 to atmosphere, and also electing operation of the stop valve device 88 to supply fluid under pressure from the reservoir I|l| to pipe 52. Fluid under pressure thus sup-plied to pipe 52 will move the double check valve 5| to its left hand position since pipe 50 is vented at this time as will be later brought out. With the double check valve 5I in its left-hand position pressure of fluid in pipe 52 will be eiective through pipe i3 in the fuel cut-olf device I0 to actuate piston I therein to move the fuel control lever 1 to its cut-o position in which it is shown in the drawing. With the supply of fuel to the engine thus cut ofi the engine will be stopped.

Let it further be assumed that the engine was last operated in the astern direction under which condition the power piston 31 will be positioned as shown in the drawing and the parts of the directional interlock valve device 45 will likewise be positioned asv shown in the drawing. The astern pipe 43 connected to chamber 40 at one a5-'sativa sideof the'povvervpiston 31 will therefore be 'open 'to atmosphere past the release valve in the astern interlock valve device 55 of the directional control valve device '45, `While the ahead control pipe 4e from chamber 4| atthe opposite side of "said piston will be open 'past the supply valve 51 in :tlte'a'stern interlock valve Vdevice 55 of 'the directional control valve device '45 to pipe 141 'whichis open to atmosphere through the operato'rs control valve vdevice as above mentioned.

With the apparatus .conditioned "as 'just described, if the operator desires to Yoperate the engine in the samedirection as it waslast operlated,'that is, in the astern direction in the present instance, he will move lever ||l1from Stop position directly tothe Astern Start position in the short slot I I4. In this position of lever |01 cam |2| vwill act to close therelease valve 59 and open the vsupply valve9@ in'the as'tern'valve device 86 so'as tosupply iuid under pressure to ypipe 46 leading to the astern interlock valve device 55 in the directional controlvalve device 45, but the supply valve 51 insaid interlock valve device will at this time be Aclosed tc prevent'flow of uid under pressure to pipey 43 and thus to chamber 4D in the iiuidmotor 35. The supply ofiluid tochamber 4|) at this time is-not essential since the powerpiston 31 of the reversing motor 35 is already in the position for positionring the cam shaft 2 to provide for operation of lthe engine inthe astern direction.

The movement of the operators control lever 01 into the short slot H4 will also effect closure of the release valve 99 and opening of the supply valve 90 in the start valve device 81 so as to thereby 'supply fluid under pressure from the reservoir to pipe |02 and'thenceto chamber |39 in the reversing interlock valve device |25. With the power piston 31 vin its astern position as shown in the drawing the piston rod 38 will be positioned to effect closure of the release valve I 31 and 'opening of thel supply valve |3| in the reversing interlock valve device |25, so that fluid supplied to chamber |30 therein will promptly now to pipe 23 and thence to chamber 30 in the starting air valve device 22, and also to chamber 11 in the directional control'valve device 45.

Fluid pressure thus supplied to chamber in the starting airvalve device v22 will move piston 29 'against spring 32 to close valve21 and to open and thence to the engine wherein it will actr in Y the conventional manner to Vstart kthe engine turning in the direction determined fbytheposition. of the camrshaftZ.

When the operators control lever-|51 is moved outof Stop position camY |22 will operate to V permit closure of the supply valve .55h57 spring33 and-,opening of therelease valve 39 by pressure of fluid from pipe 52, in the stop valve devicefSB, for .thereby releasing :fluid under vpressure from pipe52. :At thistime pipe lillis-alsoopen'toat-` mosphere'by way Aofpipe I3v as above described, so that fluid under pressure will be releasedfrorn chamber l2 .in .the fuel cut-oifdevice lli byway of 4pipe A52. Spring `Il in the fuel cut-off valve device will then actuate piston! |.to pull the fuel control lever `1 lfrom its fuel-cut-oif'position in whichV it is shownin the drawingfto thefuel supply positionindicated .by the dotanddashline v3. Fuel :will-',thusbe.suppliedto the engine .so-that when vthe engine .starts to .turn lin the :selected direction-under the pressure of starting, air supl0 r plied by the'starting air valve device 22 to (pipe 25. the engine will re and then run on'fuel Fluid pressure'supplied to pipe 23 for operating the starting air valve device 22, being also effective in chamber 11 'in the directional interlock valve device 45 will actuate plunger '15 'to move the vdisc 14 into frictional contact with the end ofthe crank shaft When the crank shaft starts to turn under the pressure 'of starting air supplied tothe engine it will tend to turnvthe disc 14, but'this tendencywillbe without effect in restarting the engine in its last direction of operation, since the parts of the directional control valve device will already be properly positioned 'from the lasttime the'engine lvvasoperated, and will bemaintained in this position by the vpower exerted by spring 19.

After `the `engine is started `and running on :fuel the operator'will then move control lever f 01 out of the Astern Start position intothe adjacent Run position to thereby actuate plunger '|04 and lever ||`1 to permit spring 93Y to` close the jsupply valve in the' start valve deviceY 8-1 and to permit pressure of fluid in chamber `9| `in said device to unseat the v respective yreleasevalve 93, whereupon fluid under pressure Will be released from `piston chamber 30 in the starting air valve device 22 and from-chamber v11 in the directional control valve device 45 by way of pipe 23past the-supply valve |-3| in the reversing interlock valve device |25 vand then through Apipe |02. v Spring 32 in the starting air valve device 22 `will then return the piston `29 to the position shown in the drawing for opening the release valve 21 and during `such operation spring 33 will close the supply valve 25 for thereby lcutting Yoff the nsupply of starting air-to pipe 25 and to the engine andv for opening said pipe to atmosphere pastI valve 21 and thence through port-28. Upon release of 'uidunder pressure from chamber "11 inthe directional control device 45 pressurebetween the friction disc 14 and vthe vend of the crank shaft .will berelieved so that said-disc may 'free itself from said-crank shaft, but -the parts of the directional control devicewill remain in the position to which 'theywere moved, that is, in the position shownin'the drawing' in the present instance, due tothe action of spring 19on the controlling'deve'ry 10. `Itwi1l be noted that with the vparts of lthe direction controldevice in the position -ju'stA mentioned communication will be'open between the ahead controlpipes 51 and 44, while 'communication will still be broken between the astern control pipes 43 and 45,'and pipe 43 will be open to atmosphere past the `release 'valve '55 in the astern interlock valve device 56. v

`From the above description-it will be noted that restarting theY enginev inits'last direction of operation essentially consists of merely releasing iiuid under lpressurefrom the fuel cut-off device `It) by .Way of pipe'52'to permit supply of fuel to'the engine, ando'f supplying'fluid underpressure to actuate the starting 'air valve devicei22 to supply startingair to the .engine to cause the engine to startturninginthe selecteddirection. "Immediately vupon firing Vof .the engine, the .lever is then Ireturned .to ,the VRun position .to .cut off .the supply .of starting air to `the engine, and Ythe engine will then .continuetorun on fuel, K With-the-.engine operating in the astern direc- .tionif the operator desires toreverseits direction of toperation, .that Vis V.fromV astern 4to r ahead, he will-.move..lever |51 from-.the ..Astern Runf positionto the Ahead Run position and then,

11 if he desires, immediately to the Ahead. Start position in slot H3.

Movement of the operators control lever` from the Astern Run position to the Ahead Run position will cause operation of the astern valve device 80 to open pipe 4B to atmosphere, Without effect however since said pipe is merely open to chamber 59 between plunger 52 and the closed supply valve 51 in the astern interlock valve device 50 in the directional control valve device 45, and at the same time said movement of the operators control lever will also effect opera- `tion of the ahead Valve device 85 to supply fluid under pressure to pipe 41. Fluid thus supplied to pipe 41 will flow past the open supply valve 51 in the ahead interlock valve device 55 in the directional control device 45 to pipe 44 leading to pressure chamber 4| at the left-hand side of the power piston 31 and also leading to the double check valve 49.

Since .pipe 43 is at this time open to atmosphere through the directional control valve vdevice 45, the pressure of fluid provided in pipe 44 as just described will shift the double check valve 49 to its right hand position and then become effective in pipe 50 on the double check valve 5|. Pipe 52 is open to atmosphere through the stop valve device 88 in the operators control valve device with the lever |01 out of Stop position, so that pressure of fluid in pipe 50 will shift the double check valve 5| to its right hand position and then become effective through pipe |3 in the fuel cut-olf valve device I5 and actuate said device to move the fuel control lever 1 to its fuel cut-off position to cut-off the supply of fuel to the engine, so that the engine may stop.

At the same time as the fuel to the engine is cut-off the pressure of fluid provided through pipe 44 in chamber 4| of the reversing motor 35 will move piston 31 from its astern position shown in the drawing to its ahead position at the opposite end of the cylinder 36 and this movement of said piston will move the control lever 5 to the ahead position indicated by the dot and dash line 5a for thereby shifting the cam shaft 2 to the position to provide for operation of the engine in the ahead direction.

With lever |01 in the Ahead Start position the start valve device 81 will act to supply fluid under pressure to pipe |02 leading to the reversing interlock valve device |20. As soon as the piston 31 starts moving out of its astern position shown in the drawing toward the opposite end of cylinder 36, the ball |39 will move into recess |42 to permit spring |32 to close the supply valve |3| in the reversing interlock valve device |25 so that fluid supplied to pipe |02 cannot ow to the starting pipe 23. However as soon as the power piston 31 obtains its ahead position at the right hand end of cylinder 36 the ball |39 will be moved out of the slot |42 to thereby close the release valve |31 and open the supply valve |3| in the reversing interlock valve device |23, se that uid may then ow from pipe |02 to the starting control pipe 23 and thence to piston chamber 35 in the starting valve device 22 and also to chamber 11 in the directional interlock valve device 45. i

12 come effective in the engine to oppose movement of the engine pistons to thereby promptly bring the engine to a stop, then at the instant of stopping said air will be effective to start the engine turning in the new or ahead direction.

At the same time as the starting air is supplied to pipe 25 to start the engine, the pressure of uid effective in chamber 11 on piston 15 in the directional control valve device 45 will move the disc 14 into frictional contact with the end of the crank shaft With the crank shaft still turning in the astern direction the disc 14 will have no effect upon the position of the parts of the directional control valve device 45 but immediately upon starting of the engine to turn in the new or ahead direction, as determined by the position of the cam shaft 2, the friction dsc 14 will turn with the crank shaft in a clockwise direction as viewed in Fig. 5 of the drawing. This turning of friction disc 14 in a clockwise direction will turn lever 10 in a counterclockwise direction which will permit spring 00 to close the supply valve 51 and pressure of fluid from pipe 44 in chamber 58 to open the release valve 55 in the ahead interlock valve device 55, so as to thereby release fluid under pressure from the power piston chamber 4| through pipe 44 and at the same time from chamber I2 in the fuel cut-off valve device l0 past the check valves 5| and 49 and through said pipe. Spring I1 in the fuel cut-off device will then rock lever 1 from its fuel cut-off postion to its fuel supply position indicated by the dot and dash line 8, to thereby supply fuel to the engine. With the engine turning under the pressure of starting air supplied by the starting air valve device 22 the engine will then lire and run on fuel.

When the ahead interlock valve device 55 is operated to release fluid under pressure from the power piston chamber 4| and from the fuel cutoff device I0 as just described, the lever 10 acts to seat the release valve 65 and to open the supply valve 51 in the astern interlock valve device 56 to thereby reestablish communication between pipes 46 and 43. The opening of this communication is without effect at this time but is essential to subsequently reverse thevdirection of operation of the engine from ahead to astern, as will be later brought out.

After the engine is running on fuel in the ahead direction the operator will move lever |01 from the Ahead Start position in slot ||3 to the adjacent Run position to thereby effect operation of the starting valve device 81 to open pipe |02 to atmosphere. Fluid under pressure will then be released from piston chamber 30 in the starting air valve device 22 and from chamber 11 in the directional control valve device 45 by way of pipe 23 and thence past the supply valve |3| in the reversing interlock valve device |26 and through pipe |02. Upon this release of fluid under pressure from chamber 30, Spring 32 in the starting air valve device 22 will open the release valve 21 and permit closure of the supply valve 25 vby spring 33 whereuponthe starting air pipe 25 will be vented to atmosphere through the atmospheric port 28. The release of fluid pressure from chamber 11 will 'permit the friction disc 14 to disengage itself from the end of the crank shaft but the parts of the directional control device 45 will remain in the position to which they were moved by said disc upon starting of the engine in the ahead direction, due to the over-center action of spring 19 on the lever 10.

To summarize, it will now be seen that if the operator-moves the control lever 01 from the .I2-eilandje.,

` 113 Astern Run position to :the Ahead Start position thefuel control device l will be promptly operated to cut off the supply of fuel to the engine in order that the engine may stop, and at thesame time the reversing motor 35 will beppe erated to reversethe cam shaft 2 to providefor operation of thevengine inthe ahead direction. This reversing ofthe camshaft 2 may be completed while the engine is still turning in the astern direction, but as soon as the cam shaft shiftingr has been completed starting air will be supplied to the engine vby operation of the -starting air valve device 22 to effect braking of the engine. vin case it isnot already stopped, and to effect starting of the enginein the new direction after it has comete astop. The-directional interlock device l5 vwill prevent operation of the fuel control valvedevice .Hl to `supplv fuel to the engine while the 'engineis still turning in the direction -of last'operation, but immediately upon starting,r of the engine in the new or ahead direction, as in the present instance, said device will automatically operate to supply fuel to the engine sothat it may nre and run on fuel.' Then after theengine isrunning on fuel, the operator will move lever Uil to thefadiacent Run nosition for cuttingoff thesupply of starting air to the-engine. I

It willalsc be noted thatthe directional control device 45 not onlvcontrols-oneration of the fuel cut olf device lllftoprevent sunplv of fuel to the motorA until after the engine actually starts turnine in the Vselecteddirection, but it also controls the simply ofY air .for effecting movement of the reversine vpiston so vthat after the reversing movementof said piston has been completed the actuatinenrevsure in chamber il will be released in order to relieve :winsten 3J of such pressure dui-ing operation kof the engine.

rViith the enqineoneratine in theahead direc- L tion if thelonerator desires to reverse the direction of opere` tionto astern he will move lever .lill

from the Ahead Il'1,un position to the Aster-n "Si-art position in slot lill and this operation will effect operation of the ahead valve device l 85'to open pipe-lll lto :atmosphere and at the Sametime will actuate .the astern valve device .8,5 tosnpplvfluidunder pressure-to pipe 45. Fluid thus vsupplied to pine 4 5 `will flow .past the open supply valve 51 in the astern valve device 55 of thev directional interlock valve device 45 to pipe 43 leading to piston chamber di! `in the reversing motor 35 and also leading to the right-hand end of the `double checkvalve All. Sincepipe ,A4 isat this timefopen toatmosphere through-thedirectional control device 45, pressure of fluid supplied to pipe Q3 will shift the ,double checkrvalve 49 to its left hand position and then become effective in pipe A5l). Pipe 52 is also open Y.to atmosphere vat this time so ythat `fluid under pressure supplied to pipe 5l! will -move the double check valvejl toits right-hand'position and then flow through pipe i3 to the fuel cut-olf valve device lil land effect operation thereof to cut-.off lthe supply- -Qf fuel. to the engine SQ 'that incrocia@ maytrop.. Y l Y i,

'Sinceehamber 4l in.` the reversingimotor is open toatmosphereat this time throughipipe ydll and past .valve 55Y in therasternrinterlock-

valve device

5,5 ,in the directional interlock valve-device 45, lluid under pressure supplied through pipe ,43 yto chamber .40 in said motor will then move ill@ reversing Pistol@ 3l frerellsehead PQ iiion at t Iighthand: end of cylihdei to its; ,astern Y. ingang en@ fer therebympf.

irig` the camshaft 2 to its astern position :inv

which it isshown in the drawing.

With the operators control '-lever f-in the Astern Starti'position in yslot H4 the start' valve device -8l will lsupply Viiuidunder pressure topipe +02, but the vreversing interlock valve device IZS will operate duringthe reversing move-- nient ofthe power vpiston 3'l'to prevent flow off fluid under pressure from ypipe N2 to pipe-213. When the reversing piston 3l attains its astern: position in which it is 4shown in the drawing, the reversing interlock valve device l26 will be operey ated however to reestablish communication between pipes `i2 and 23 so that fluid under-"pressure will then flow'to the starting `air valve dee vice -22 to effect loperation thereof to supply starting air to pipe y and thence-to the engine. If the vengine isstill turning in the direction of last operation this-supply of starting `air will become effective in the engine-to brake same and promptly bring it to a ustop and then immediately be effective to start the engine turning in the new or astern direction determined by the new lposition of the engine cam shaft 2. Fluid supplied to pipe 23 will also flow to chamber '11 in the directional interlock valve device and therein act von piston 75 to'move the disc 14 into frictional engagement with the end of the crankshaft l. If the engine'is stilloperating in its last direction of operation, vthatis, in the ahead direction in the present instance, the disc T4 will not change the position of the directional con--y trol device 15, but as soon as the engine starts to turn in the opposite or new direction determined by the new positition of the cam shaft 2,

the disc 'lli will operate to turn lever 10 to the astern position shown in Fig. 5 of thedrawing, to ythereby permit closure ofthe supply valve 51 by spring Si) and opening of the release valve -55 by pressure of fluid from chamber 518 in the astern interlock valve device 55. Fluid under pressure will then be released from pipe 43 and thereby from the fuel control valve device l!) to permit operation thereof to draw the fuel control lever l from its yfuel cut-olf position to its fuel supply position vindicated by the dot and dash linee for thereby supplying fuel to thesenegine. The engine will then re and run on fuel. At the same time as fluid is released from the fuel cut-olf device l!! by way of pipe 43, fluid pressure rwill also be released from pressure chamber 4d inthe reversing motor by way of Said pipe so as to relieve the reversing piston 31 of actuating pressure after its operation has been completed. f V I After the engine fires and'is running on fuel 1n the astern direction as just described, the operator will `then move lever lill out `of the Astern Start position 'to the adjacent v "Runposition to thereby eiiectoperation of the start valve device 8l to open pipe |52 to atmosphere. Fluid under pressure will then be released, from .piston .chamber :in .in the 'starting valve ydevice 22 vto lpermit `closure ofthe supply valve -2'5 and opening of -the release valve 21 therein. With the .release valve 2l thus open fluid will be released `from the starting airpipe 25. This vrelease of fluid under pressure from pipe 23 will also result in a-release of fluid under pressure frompiston chamber ll, sothat the disc 'it may disengage itself from the crank shaft I. Theparts'of the directional control valve device lif will however remain in their astern-position f' @1S110WILR Eigs5 underntheaction offspring 119 l and iii which position it will be noted that the release valve 65 is seated and-the supply valve 51 open in the astern valve device 55 to thereby establish communication between

pipes

47 and 44 as required t`o effect a subsequent reversal of the engine from operation in the astern direction to the ahead direction.

Whenever the operator desires to stop the engine, regardless of its direction of operation, he need only move lever |01 to Stop position for effecting operation of the stop valve device 88 to supply lluid under pressure from the reservoir lill tov pipe 52. With pipe 5S open to atmosphere by way of the directional control valve device 45 through either pipe 44 or pipe 43, as is always the case with the engine running, the pressure of iluid in pipe 52 will shift' the double check valve 5I to its left-hand position and then become eectivethrough pipe i3 in the fuel cut-off device i to actuate said device to move the fuel controllever l to its fuel cut-'off position. When the supply of fuel to the engine is thus cut olf the engine will stop.

When the engine is stopped from operation in an ahead direction the restarting of the engine Summary It will now be seen that I have provided a control apparatus for controlling the starting, stopping and reversing of a reversible internal combustion engine which is relatively simple. Reversal of the engine is eected by fluid under pressure supplied through a control pipe to a reversing motor and fluid pressure from this same pipe is employed for cutting off the supply of fuel to the engine sc that immediately upon initiating a reversal in direction of operation of the engine the fuel supply to the engine will cut olf in order to allow the engine to stop. A device responsive to direction of rotation of a rotatable part of the engine controls the supply of fluid under pressure to effect cutting ofi thefuel supply to the engine and is operable automatically upon starting of the engine to turn in the ldirection determined by the position of the cam shaft to promply resupply fuel to the engine to permit restarting thereof in the new direction, but said device is operable to prevent resupply of fuel to the engine until after it does actually start turning in said new direction. The fluid pressure for actuating the reversing motor for eifecting reversal of the cam shaft may also be controlled through the directional control device in which case said motor will automatically be relieved of actuating fluid pressure after the cam shaft has been shifted to the desired position.

.Having now described my invention, what I claim as new and desire to secure by Letters Patent, is: i

1. In fuel control apparatus for a reversible engine havinga part rotatable in the direction ofoperatien of said engine, the combinationwith reversing means operable to condition said engine for operation either in one direction or in the opposite direction, starting means operable to initiate turning of said engine, fuel control means operable to either cut off the supply of fuel to said engine or to permit supply of fuel to said engine, and operators control means operable to effect operation of said reversing means, said starting means and of said fuel control means to cut off thesupply of fuel to saidengin'e,

of control means cooperative with saidoperators control device to effect operation of said fuel control means to cut olf .the supply of fuel to said engine upon operation of said operators control device to effect operation of said reversing means, and means adapted to cooperate with said rotatable part of said engine upon starting of said engine in a direction determined by said reversing means to operate said control means to effect operation of said fuelcontrol means to permit supply of fuel to said engine.

2. InV fuel control apparatus for a reversible engine having a part rotatable in the direction of operation of said engine, the combination with reversing means operable to condition said engine for operation in a reverse direction, starting means operable to initiate operation of said engine in said reverse direction, fuel control means adapted to be operated by fluid under pressureto cut olf the supply of fuel to said engine, means operable upon release of fluid under pressure from said fuel'contro'l means to permit supply of` `fuel tol'said engine, andan operators control device operative to effect operation of said reversingv means and starting* means and alsooperative to supply fluid under pressure to said fuel control means, of valve means controlling communication through which the fluid pressure is supplied from said operators control device to saidv` fuel controlmeans, and `means controlled by` said rotatable part of said engine and operable uponY starting of said engine in the direction determined by said reversing means to effect operation of said valve means vto close saidcommunlcation and torelease fluid under pressure from said fuel control means.

3. In fuel control apparatus for a' reversible engine having a part rotatable in the direction of operation of said engine, the combination with reversing means operable to condition said engine for operation either in one direction or in the opposite direction, starting means operable to initiate operation of said engine in the direction determined by said reversing means, fuel control means operable by fluid under pressure to cut off the supply of fuel to said kengine and operable upon release of fluid under pressure tov permit supply of fuel to said engine, an operatorsrcontrol device operable to effect operation of saidV reversing means and starting means `and also operable to supply fluid under pressure to one pipe upon operation to effect operation of said reversing means to condition said engine for operation in said one direction and to a second pipe upon operation to elfect operationof said reversing means to condition said engine for operation in said reverse direction, saidoperators control device being also operable upon supplying liuid under pressure to either one of said pipes to open the other pipe to atmosphere, and a double check valve connecting both of said pipes to said fuel control means and operable upon supply of` fluid under pressure to either one of said pipes when theV other pipe is open tofatnosp'here to'open communication between the pipe supplied with fluid under pressure and said fuel control means, of two valve devices one for controlling communication througheach of said pipes and operative to either open said communication or to closesame and open to atmosphere the portion of the respective pipe connected to said double check valve, actuating means selectively operable to actuate either one of said valve devices to open the said communication controlled thereby and to at the same time agcsog's'ra i actuateethesother-valveedevice to close the-other communication; and-means Vlarranged-1 to r control said i actuating means-controlled by rotation of' said rotatable-part ofL said engine and operable upon'frotation'ofsaid-fpart in afdirection contrary to" thelcon'dition of fsaid reversing l'means to ei ect operation-of the-said valve device inthe one of said pipes-supplied vvi-thV fluid under pressure toreversing means operable to condition said engi-ne for-operation in either-one direction or'fin the reverse direction, starting meansv operable byiluid under-,pressure to initiate-'turning of said engine, fuel-'control means-selectively operable tofeither cutzoif'vthesupplyof fuel -to -thesaid engineior to permitsupply ofl fuel to said engine, and* an operators control valve device operable to effect operation of said reversing means to condition said engine for operation in either one direction or in the opposite direction and also operable to either supply fluid under pressure to said starting means or to release iiuid under pressure from said starting means, of directional control means adapted to be controlled by said rotatable part of said engine and cooperable with said operators control device to control said fuel control means and operable upon rotation of said part in a direction contrary to the condition of said reversing means to render said operators control device effective to effect operation of said fuel control means to cut off the supply of fuel to said engine and operable upon rotation of said part in a direction corresponding to the condition of said reversing means to effect operation of said fuel control means to permit supply of fuel to said engine, and means operable by fluid under pressure supplied to eect operation of said starting means to render said directional control means responsive to rotation of said part.

5. In fuel control apparatus for a reversible engine having a part rotatable in the direction of operation of said engine, the combination with reversing means operable upon supply of iiuid under pressure to one pipe When fluid under pressure is vented from a second pipe to condition said engine for operation in one direction, and operable upon supply of fluid under pressure to said second pipe when fluid under pressure is vented from said one pipe to condition said engine for operation in said opposite direction, starting means operableto effect starting of said engine, an operators control device selectively operable to supply fluid under pressure to either one of said pipes and at the same time to vent theother pipe and effect operation of said starting means, and fuel control means operable by fluid under pressure to cut 01T the supply of fuel to said engine and operable upon release of fluid under pressure to permit supply of fuel to said engine, of valve means controlled by said rotatable part of said engine and operable upon operation of said engine in either said one direction or in the said opposite direction to establish communication for supplying fluid under pressure from either said second pipe or said one pipe, respectively, to said fuel control means and operable upon operation of said engine in the direction determinedfby -said'reversing means to cut off the supply'offluid under pressure to said fuely control means-and-to `release the fluid under pressure therefrom.v

6;- In fuelfcontrol apparatusV for a reversible engine having apart rotatable in the direction cfs-'operation of said engine, the combination With vreversingmeansmovableto one-position to condition fsaid' :engine for operati-on in yone direction andimovabie tox a'seccnd position to'condition said'engineefor-operation in the `opposite direction, starting'means for said engine,` an operatorsy control"device comprising aV control lever having first?y and second positions and being operable uponfrnovement therto to-eifectl movement of said reversing` means to respectively either' its iirstffp-osition lorit'ssecond; position and to i also efe'ctcperation of'fsaidstarting means, and fuel control-imeans--for saidlfe-ngine having a fuel supplylfpositionand afuel-cut-ofi position, of directional *control meansadapted to respond'to directionofrotation'of said rotatable part of said'engine-and operable-'toa iirstpositionupon operati'cn -offfsaid engine inf-said one direction" and to a second position upon operation of said engine in said opposite direction, and bias means operable to maintain said directional control means in either its rst or second position With said engine operating in either said one or opposite direction respectively, said operators control device cooperating With said directional control means upon movement of said control lever to either its first or second position when said directional control device is in either its said second or said first position respectively, to effect operation of said fuel control means to its cut-oil position, and said directional control means being operable in either its rst or second position with said contr-ol lever in respectively either its rst or second position to effect operation of said fuel control means to its fuel supply position.

7. In control apparatus for controlling the reversing of a reversible engine having a part rotatable in the direction of operation of said engine, the combination with a reversing motor operable upon supply of fluid under pressure to one chamber to condition said engine for operation in one direction and operable upon supply of uid under pressure to a second chamber to condition said engine for operation in the reverse direction, and an operators control device operable to supply fiuid under pressure to said chambers, of valve means controlling communication between -said chambers and said operators control device,

actuating means movable to one position to effect operation of said valve means to connect said one chamber to said operators control device and to connect said second chamber to atmosphere and movable to a second position to effect operation of said valve means to connect said second chamber to said operators control device and to connect said one chamber to atmosphere, and means responsive to rotation of said rotatable part of said engine for controlling the positioning of said actuating means and operable upon operation of said engine in a direction determined by said reversing means in response to pressure of fluid supplied to said one chamber to move said actuating means to said second position and in a direction determined by operation of said reversing means inresponse to pressure of fluid supplied to said second chamber to move said actuating means to said one position.

8. In apparatus for controlling the reversing of and fuel supply to a reversible engine, the com- 19 bination with reversing means voperable upon supply of fluid under pressure to one pipe to condition said engine for operation in one direction and upon supply of uid under pressure to a second pipe to condition said engine for operation in the opposite direction, fuel control means operable by uid under pressure to cut oi the supplyof fuel to said engine and operable upon the release of such fluid pressure to supply fuel to saidvengine, valve means operable upon supply of fluid under pressure to either one of said pipes to open `communication between that pipe and said fuel control means, and an operators control device operable to selectively Vsupply fluid under presssure to either one of said pipes and to effect operation of said starting means, of other valve means controlling communication between said operators control device and said pipes and selectively operable to open communication between either one of said pipes and said operators control device and at the same time to close communication between the other one of said pipes and said operators control device and to open the last named pipe to atmosphere, and means arranged to respond to direction of operation of said engine and operable upon operation of said engine in said one direction tc operate said other valve means to establish the communication between said second pipe and operators control device and operable upon operation of said engine in said opposite direction to effect operation of said valve means to establish the communi-cation between said rst pipe and said-operators con trol device.

' RALPH T. WHITNEY,

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date V2,240,163 Pick Apr. 29, 1941 2,288,173 Wohanka June 30, 1942 12,395,202 Stevens et al Feb. 19, 1946 VV2,433,916 May et al. Jan. 6, 1948 2,444,273 Stevens June 29, 1948 2,482,301 Stevens Sept. 20, 1949