US2338546A - Combustion apparatus - Google Patents

Description

Jan.: 4, 1944. c.. sel-lou..

COMB'USTION- APBARA'EUS Filed Dec. 135 1940 4 Sheets-Sheet l Ja'n. 4, 1944. c, SCHQLL 2,338,546

coMBUsTIoN APPARATUS Filed D66. 13, 1940 4 Sheets-Sheet 2 M @La @m3 W Q' 7&4,

Jan. 4, 1944. C. scHoLL, 2,338,546

coMBUsToN APPARATUS v Fiied Deo. 1s. 1940 4 sheets-sheet s lll Jan. 4, 1944. C, scHoLL coMBUsTIoN APPARATUS N Filed Dec. 13, 1940 4 Sheets-Sheet 4 lo Patented Jan. 4, 1944 UNITED STATES PATENT OFFICE 2,338,546 COMBUSTION APPARATUS clark schon, springfield, ohio, assignor to The Steel Products Engineering Company, Springfield, Ohio, a corporation of Ohio Application December 13, 1940, Serial No. 370,047

9 Claims.

This invention relates to stokers and more particularly to a drive for a stoker of the ram feed type.

It is a prin-cipal object of this invention to provide a drive for a Stoker of the ram feed type adjustable as to rate of feed in which agitation is afforded for the fuel bed under both high and low rates of feed so that objectionable coke formation will be effectively broken up and a properly regulated and controlled feeding action secured.

It is also an object to provide a simple and effective hydraulic control for a directly driven ram feed stoker adapted to provide positive forward feeding movements of the ram at a maximum and substantially uniform ratesuch as to effect agitation of the fuel bed and the breaking up of objectionable coke formation at each feeding stroke, and operable to vary the period between operating strokes to thereby adjust the rate of feed of the stoker to -a predetermined value, as desired.

It is also an object to provide a Stoker of the ram feed type which is provided with a clutch for establishing driving engagement from a power source to actuate the ram in substantially uniform rapid feeding and return strokes to effect agitation of the fuel, andin which an adjustable hydraulic control is provided forcontrolling the operation of such clutch to effect regulation of the period of time between successive feed strokes, thereby varying the rate'of fuel supply.

It is also an object to provide a control for a ram type Stoker which is sensitive and easily adjustable to any portion of its range ofadjustment and adapted for accurate and precise response to oating pressure controllers for regulating the rate of fuel supply to maintain a predetermined pressure condition within a boiler.

It is a still further object to provide as a separate unit, a relatively inexpensive hydraulic control which may be applied to a regular reduction drive for a ram type stoker with a minimum of change and thus used as optional equipment.

Other objects and advantages will be apparent from the following description, the accompanying drawings, and the appended claims.

In the drawings,

Fig. 1 is a View partially in side elevation and partially in vertical section showing a stoker installation of the present type;

Fig. 2 is a plan view looking down upon the gear case and the hydraulic control mechanism with the top covers removed therefrom, certain of the parts being shown in section to more clearly disclosethe construction thereof;

Fig. 3 is an end elevational view of the gear case with a portion of the wall broken away'to show the construction of the valve and clutch operating mechanism;

Fig. 4 is a partial vertical sectional view on the line 4 4 of Fig. 2 showing the manually controlled timing valve;

Fig. 5 is a vertical sectional view through the hydraulic control mechanism on the line 5 5 of Fig. 2;

Fig. 6 is a sectional view of a detail of the hydraulic control mechanism on the line 6 6 of Fig. 2; and

Figs. 7, 8 and 9 are detail sectional views through the cylindrical preselector valve member on the lines 1 1, 3 8 and 9 9 respectively, of Fig. 5.

Referring to the drawings which discloses a preferred embodiment of the invention, the hopper for receiving a quantity of solid fuel is 'shown at I0, of suitable construction for supplying the fuel downwardly and forwardly to the space in front of the ram l I mounted of reciprocation in the ram guide I2. Upon the return lstroke of the ram, a quantity of fuel is deposited in front of its feeding face I3, and upon the forward or feeding stroke of the ram, that fuel is advanced into the retort I4 where it is in proper position to be burned upon the fuel bed. Additional forward feeding members l5 are provided in the retort, if so desired, the retort construction herein shown being merely illustrative. A lever systemy I6 is preferably mounted within the hopper and provided with suitable agitato-r arms' l1 eX- tending into the hopper, so that upon reciprocating movements of the ram Il,y lever I6 will effect agitating movements thereof and cause the smooth and uniform feed of the body of fuel, the arrangement of the arms being such that they act to propel the fuel forwardly and intothe space in front of the ram upon the return stroke thereof.

The ram may be arranged to move with a relatively rapid forward feeding and return stroke at a high rate of fuel feed, such as to cause an effective agitation of the fuel bed. However if such rate of movement is reduced at lower rates of fuel supply, then the effectiveness of the agitating action is impaired and there is an increased tendency for formation of bodies of coke with consequent loss of uniformity and eiciency of combustion. Thus in the present invention, the ram is arranged to be driven by a direct drive 'versely through the gear case. lispreferably 4directly connected to blower 36 to at substantially uniform and relatively rapid forward and return strokes under all rates of stoking, the variation in the rate of fuel supply being secured by providing a variable hydraulic control for establishing predetermined selected time intervals between successive cycles of ram operation. It is preferable to provide for such rapid movement of therarn onthe return as well as on the forwardstroke since better feeding within the hopper is found to take place where the return movement of the ram occurs rapidly.V

And preferably the ram is arranged to be directly driven by a crank which gives .the desired smooth regulated action ofthe rainthroughout its cycle of movement, the .,cranklbeingclutch l,

connected under timed hydraulic control, `-`with the source of power.

the periphery thereof.

The ram is arranged to be directly driven from Y an eccentric crank 2t, by means of a connecting rod 2l suitably attached to the transverse pin 22 within the body of the .The 'eccentric crank is preferably:y for-med 1 of lseparate.` elements,

such asthe 'top-crank membert'23,and thelower 'crankmember 24, :crank 23 :being keyed'to its drive 'shaft'25to eiectpositive:drivingrelation of the crank. The bearing bracket'ZS'supported `from` the lower. end .of the ram: casing .provides `for mounting shaft 21 about which the lower crank 24 rotates.

iThedrive'shaft'iZ projects .downwardly from :the -lowerend of agear case .Sil on the top of which is mounted a drive motor 3 I, preferablyan -electric motor, which'hasa V--belt pulleydrive 32 4foreffecting'operation ofa larger driven ypulley 33 carried by driven shaft 34 extending trans- The motor also 'effectoperation' thereof for the supply of combustion air through air conduit 3l into theretort.

Attached to the-rear side of the gear case 3B byf-suitable bolts and-in closelyspaced relation fther'etoisV the hydraulic control .unit4;- in'order 4'toprovidea drivefor such unit, a separate pulley f'on'zdriven shaft 341s arranged with a V-belt drive :Li Itoidrive shaft 42, which shaft extends into the "casing fof the hydraulic unit.

rReferring rst to the'mechanical drive for the "ram,'as:shown in Fig. 2 driven shaft 34 is'suitably v'journaled atll in theigearcasing 3Q, and isY provided at its inner end with a multiple disk clutch memberfl. The mechanismY includes a slidable clutchxcollar 52 spline mounted upon a driven member `53 which is directly connected with shaft 54,1 suitably journaled in the casing as shown at 55. `Meansare provided for'` shifting the-clutch collar toeffeot'engagement and disengagement of theclutch comprising, as shown in Fig. 3, a yoke Y'5T for vengaging the oppositesides of the collar, rsuchfyoke vbeing carried byla shaft' rotatably supported in the wall of the casing so that upon rotation, the yoke 5l' will effect the shifting of the 'tclut'chcollar in. one direction or thezother.

YThis; clutch actuating shaftii extends outwardly from the gear casing and into the casingof the hydraulic unit dil.

A worm til isformed .upon .shaft 54 and is adapted `.to vengage :a Hworm -wheel 6l mounted upon; oneend of. a countershaft 62, the latter be- .in'gisuitably journaledin the walls of the gear .zcasingfl. :Shaft 62 also carries a-wormwhich :has tdriving .engagement with a larger worm .wheel whichis keyed to the maindrive shaft 25,csitably journaled in the casing and extend- `ing..downvvardly.to the eccentric ,crankfor operating the rain. y'lhusthe relatively high speed ...a .predetermined point in the rotation of worm .wheel 64, causing the rocking of lever arm 68 laboutits,supporting shaft 69, this action taking .place at .a predetermined point in the cycle of movement of the ram, preferably at substantially vthe point where the forward feeding stroke of the ramv is completed, and the ram is about to begin a return stroke. In this position, the body of the ram cuts 'on communication. between the retort "and the hoppenfavoidingl objectionable backing up of the smoke or the fire into the latter. Shaft ..69 likewise extends from the gear vcase 30 into the hydraulicunit AQ, andprovides for the control of the operationcf that unit.

`*r'teferringnow to the hydraulic unit and more particularly to, Figs. 5 through 3, .the unit comprisesa closed andsealed casing .forminga reservoir for receiving .a quantity of hydraulic actuating fluid. The drive 4I providesfor continuous rotation of shaft 42, this shaft being provided .with afuid pump "1@,fpreferably in the form of agear pump having communicationwith the interior ofthe reservoir andjprovi'ding for subjectingthe fluid to pressure. YSupply passage 12 communicateswith the discharge sideof the pump,

the fluid under pressure being.supp1ied through suitably `extended and `interconnecting passages into a Hvalve chamber 13. 'Preferably `suitable "i pressure relief mechanism is associated with the 'conduitto' provide for relief of pressure therein when ithas attained a predetermined desired value, or;when the cylinder or cylinders incom- Vmunication with the pumphavev been filled and their pistonsv moved to their limits the pump will discharge through the relief valve, the continuouslyoperating pump mechanism thus providing a maintained source vof iluidractuating pressure.

'Acontrol valve 'l5 is located in valve chamber "i3, and is provided with lands 'i6` and'l, the

"pressurevsupp'ly conduit 'i2'leading tothe space 'between such lands.

Lands 'I6 and 'il control respectively the supply `of fluid'pressure into conduits' 'E3 andlg, depending upon theposition which they occupy. A manual preselector valve'il further controls the pas- Ysage of iiuid througheach such'conduitfas will bedescribed more in (detail hereinafter. `ln the position inwhich rit is shown, it'affordsfree access vforthe fluid 'passing through either conduit 'i8 or 19. A'portv 8i opening into the'reservc-ir `is located in line with conduit 18 and in :position to be Acontrolled by preselector valve Bil as will be hereinafter described. Conduitsl and 19 lead into .a'clutch operating cylinder 85, and-provide for vsupplying* fluid pressure selectively to one side or the other ofithe clutch operating piston mounted therein. The piston rod 8l carries a ,roller 33 at the end thereof, thisA roller being engaged on opposite sides by ldownwardly projecting fingers 89 of a lever arm 9E) which is. fastened to the clutch operating .shaft 523. Thus it will be apparent that the` supply of pressure fluid through conduits 'd8 to oneside ofpiston 86 willeffect movement thereof to the right as shown in Fig. 5, and in the direction to cause engagement of the clutch starting operation of the crank and causing an operating movement of the ram. Conversely, supply of pressure fluid through conduit 19 to the opposite side of piston 85 will effect movement thereof to the left, resulting in disengagement of clutch 5I and the termination of movement of the crank and of the ram. An adjustable stop member 92 is preferably provided Within the cylinder 85, to prevent excessive movement of the piston to the right beyond that movement necessary to effect proper engagement of the clutch plates.

Land I6 likewise controls communication with a pressure supply conduit 95 which leads through a check valve 96 and connecting conduit Si into the timing cylinder |08. Timing piston II within cylinder |00 is loosely mounted upon the shaft of valve member "I5, being normally spring pressed toward the left under the action of compression spring |02. A pin |03 extends through shaft 'I5 and is adapted to be engaged by the piston in its movement under the action of spring |62 to cause movement of the control valve to the left as shown in Fig. 5. The space to the rear or at the right-hand side of piston IIlI is at all times maintained at a normal pressure by reason of its being open to the interior of the reservoir through permanently open aperture |05.

The shaft of the control valve In extends through the end cap of cylinder |00 and at its outer end carries a roller IBB. This roller engages the opposite sides of a slotted lever a-rm Shaft 69 also ment of shaft 69, a corresponding movement isimparted to lever arms IIl'I and |99, the resiliently urged roller I I cooperating with cam I iii to cause further compression of spring |53 until the roller has passed over the center of the cam at which time the pressure exerted by the spring causes the roller to roll down the opposite face of the cam. This arrangement provides a positive and quick acting completion of the movement of such parts in either direction after passing the center point avoiding possibility of the valve stopping in a neut-ral position. Movement of lever arm IIl'l results in an axial movement of roller IBS and the control valve 'i5 from one of its positions to the other, movement of the valve to the right being limited by engagement of stop pin II4 with the cylinder cap.

In order to provide for the controlled timing of the escape of nuid from the timing cylinder |90, a leak passage IIE is provided in communication therewith, and leading to a needle valve II6. This valve is provided with an upwardly extending valve stem I Il which projects through the top wall of the housing 4) where it receives an adjustable member H8 providing for the setting of the valve to adjust the rate of escape of pressure fiuid from chamber |69 either manual- 1y or under the action of fioating pressure regulators. The member is preferably s0 arranged that it provides for variation over the entire range from practically no time delay up to the maximum desired in an infinite number of steps and with a movement of only about 90, thereby affording a sensitive, precise, and easily operated control. Such escape takes place through passage II9, back into the reservoir, the setting of the needle valve determining the length of time that is required for the timing piston I ilI to move to the left far enough to cause roller |I I to pass over the center of cam I2.

The operation of this construction is as follows. With the drive motor in operation, driven shaft 34 is rotated but the driving connection for the eccentric crank for operation of the ram is interrupted at clutch 5I, such clutch being in disengaged position. Operation of gear pump 'IIl produces an operating pressure in the hydraulic system, 'this pressure being supplied into conduit 72. In the position assumed, valve rod I5 is moved to its left-hand position in which land I'I cuts off communication with conduit 19, while land 'I6 establishes the supply of fluid pressure into both conduit 'I8 and 95. Accordingly fluid pressure is supplied into both the clutch actuating cylinder and timing cylinder |00. Supply of fluid to the latter causes movement of piston Il to the right, to compress spring I 2, and as the spring is compressed, the pressure in both said cylinders correspondingly rises. Cylinder Illu has a greater effective area subject to the pressure than does cylinder 85, and the arrangement is preferably such that piston Inl moves substantially to its extreme right-hand position before sufficient pressure is available to eiect movement of piston 86 to the right to cause cngagement of the clutch. Piston 85 thus moves after substantially the maximum desired pressure has been established in the timing cylinder iIl, and in moving effects engagement of the drive clutch 5I, in the manner hereinabove described.

Upon engagement of the drive clutch, power is transmitted from shaft 34 through the double worm reduction gear and into the shaft 25 which in turn effects rotation of the crank and causes movement of the ram to take place in a cycle of movement. I

Such movement continues until the cycle is substantially completed, at which time pin 65 has completed a revolution with worm Wheel 64, and comes into position to engage and move pin 66 and its accompanying lever |38 and control shaft 69. Such movement of shaft 59 is in the direction to cause shifting of the valve rod I5 to the right, and into the position shown in Fig. 5, such motion being accomplished quickly and positively as a result of the spring detent construction described above.

In such position, further supply of pressure duid into conduits 'I8 and 95 is terminated, and the fluid is supplied through conduit 'i9 into the clutch actuating cylinder at the right of piston Sii. This causes an opposite movement of piston 85 and thus results in positive disengagement of the clutch, interrupting the driving connections, and leaving the ram in a position substantially at the end of a feed stroke. It will be understood that sufficient overrun of pin 65 occurs so that the corresponding pin 65 can be reset without interference therefrom, as will be described hereinafter.

Fluid upon the left-hand side of piston 85 is discharged back into the reservoir through conduit I8 and the pressure neutralizing opening cylinder lil@ isxnot 4allowedito escape through the `same passage, by reason of the seating of ycheck v.ment

However the fluid contanedin `the timing valve SS. Such iluid is permitted to escape at a .predetermined rate past needle valve H, and through the outlet port H9 into the reservoir. rAs the fluid gradually escapes from the cylinder,

.again provides for the supply of pressure iiuid to .-build up vthe pressure within the. timing cylinder, and to .supply pressure to the clutch actuating cylinder in the direction to eiect clutch engage- As will be obvious, the adjustment of the needle valve l i6 by manipulation of control member H8 which is accessible upon the outside of theoasing will provide for predetermining the ftimerequired for this movement of the piston to .take place, thereby varying theV length ofl time lwhich elapses between successive strokes of the ram. During the course of each stroke however,

and after the commencement thereof, the stroke continues at a proper, and preferably relatively rapid rate, such as to provide for feeding at the maximum rate with continuous operation, and likewise to provide for imparting agitation to the fuel bed with resultant breaking -up of objectionable coke formation. And it will be clear that such predetermined feeding rate continues regardless of the setting of the manual control member H8, as no matter how slow the over-all ,rate of fuel supply,.as measured in terms of the periods between successive feeding strokes, the stroke itself is maintained substantially uniform kand at a relatively rapid rate.

In some cases it isv found` desirable to provide `for continuous ram movements, Vand to dispense with the regulating features as above described. Likewise under some circumstances it is desirable to provide for maintaining the ram in non- ,operative position, with the clutch in disengaged condition. For thispurpose the preselector valve 'Sii is provided, and is arranged to have a plurality of manually selective positions for securing these results. Thus the valve as shown is provided with a port 'i 25 which extends diametricaily therethrough, and is also provided with a communicating right-angularly arranged port 25, both such ports being in alignment with supply conduit it. A pair of intersecting conduits |21 yand E23 extend through the valve at right angles to each other in line with conduit i9. The valve is likewise provided with a surface slot ld extending longitudinally thereof and in the zone of lconduit i9. The valveis still further provided with a single threugh'passage ist@ located to the left of passages IE and lii, and in position to establish communication thro-ugh conduit 'i8 Awhen the valve member is withdrawn to its right- *hand position.

In the position of the parts as shown in Fig. 5, continuous communication through valve it is provided by means of ports i125 and |22, so that `the timed and regulated action of the control proceeds in the manner above set forth. When however valve Si) is turned through an arc of 90,

vsupply of pressure uid through conduit 18 is iicuto in this position, passage 26 is in alignment with conduit .'18 and passage |25. establishes communication with port Si sothat uid on the left-hand side of piston 86 Ymay be discharged back. into the reservoir. Fluid is supplied through passage l2? and conduit 18 to the clutch cylinder to cause movement thereof to the left to eiiect disengagement of the clutch. Thus in such 90 position of the preselector valve, supply of pressure fluid to cause clutch engagement is permanently out off, and pressure is supplied to actuate piston 86 to the left, thus leaving the clutch continuously in disengaged position.

If selector valve is withdrawn axially from the position shown in Fig. 5 to such point that passage |30 is in alignment with conduit 78, then the slot 29 will provide for discharge of iiuid .from the right-hand side of piston 86 back vinto the reservoir, while pressure iluid` is prevented from flowing into that side oi the cyiinder. During the time that valve rod l5 is in its left-hand position, pressure fluid can be supplied through conduit 'it into clutch actuating cylinder 85. in the direction to eiiect movement of piston 86 to the right, with consequent engagement of the clutch member. At the same time, pressure is supplied into timing cylinder Mil, and upon completion of each cyclev of operation of the ram, valve rod 'l5 will be returned to its right-hand position thereby cutting off temporarily the supply of pressure into cylinder 85. The clutch having been engaged however will remain in driving engagement even in the 'absence of continuous pressure being made eiective in cylinder 85, and hence the driving connection will be maintained. From time to time, as the pressure in the timing cylinder falls sufficiently, the valve rod 15 will be actuated to again restore the pressure conditions within both the clutch cylinder and the timing cylinder, thus providing for eiecting a continuous and maintained driving engagement.

A weighted member 32 is preferably mounted upon the outer end of the valve rod 80 and is arranged to be reecived in notches |33 suitably formed for receiving the rod in its several positions oi adjustment. lt is found that a preselector valve of this construction is especially desirable since it is simple and easy to operate, and further adapts itself quite readily to automatic 'actuation under the action of iioating pressure controllers responsive to steam pressure, or the like. The infinite number of variations in .feeding rate attainable with the present control and the securing of such variation within the limits of adjusting movement of the control member oi about 90, make it especially desirable for use with such flo-ating pressure regulators. And'it will also be clear that the present control ymay be arranged for use as optional equipment with a gear and clutch drive for the ram of standard construction so that with only minor changes, the drive may be constructed and installed for use either with or without the hydraulic control mechanism.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that 'the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defdned in the appended claims.

What is claimed is:

1. A hydraulic feed control adapted for controlling the operation of a clutch in the drive of a ram type stoker to provide for regulating the time intervals between successive operations of the ram comprising a source of iiuid pressure, valve means for controlling the application of said source of fiuid pressure, a clutch actuating cylinder and a timing cylinder both adapted to be supplied with pressure from said source, means actuated in a predetermined position in the stroke of the ram for operating said valve means to supply pressure l fluid to said clutch actuating cylinder to effect disengagement thereof and for terminating supply of pressure iiuid to said timing cylinder, a leakage valve in said timing cylinder controlling the rate at which iiuid is discharged therefrom, means for operating said valve means after the discharge of a predetermined quantity of fluid from said timing cylinder to provide for supply of pressure to said clutch actuating cylinder to cause engagement of said clutch and for simultaneously resupplying pressure iluid to said timing cylinder.

2. A hydraulic control providing for regulating time intervals between successive cycles of operation of a clutch controlled device comprising a source of iiuid pressure, adjustable valve means for controlling the application of said source of fluid pressure, a clutch actuating cylinder, a timing cylinder, means for supplying fluid under pressure in one position of said valve means to said clutch actuating cylinder to cause engagement thereof, means for also supplying pressure fluid in said position of said valve means to said timing cylinder, means operated at a predetermined point in the operating cycle of said device for actuating said valve means to another position, means operable in said other position of the valve means for supplying iiuid under pressure to said clutch actuating cylinder to cause disengagement of said clutch, means also operative in said other position of the valve means for terminating supply of pressure fluid to said timing cylinder, a leakage port for discharging fluid from said timing cylinder at a controlled rate, and means operable after the discharge of a predetermined quantity of iiuid from said timing cylinder for restoring said valve means to its first mentioned position.

3. A hydraulic control providing for regulating time intervals between successive cycles of operation of a clutch controlled device comprising a source of fluid pressure, adjustable valve means for controlling the application of said source of uid pressure, a clutch actuating cylinder, a timing cylinder, means for supplying fluid under pressure in one position of said valve means to said clutch actuating cylinder to cause engagement thereof, means for also supplying pressure iiuid in said position of said valve means to said timing cylinder, means operated at a predetermined point in the operating cycle of said device for actuating said valve means to another position, means operable in said other position of the valve means for supplying fluid under pressure to said clutch actuating cylinder to cause disengagement of said clutch, means also operative in said other position of the valve means for terminating supply of pressure uid to said timing cylinder, a leakage port for discharging fluid from said timing cylinder at a controlled rate, said timing cylinder having a movable member, resilient means for moving said member as the fluid is discharged from said cylinder, and means actuated by said moving member after the discharge of a predetermined quantity of fluid from said timing cylinder for operating said valve means to its first mentioned position.

4. A hydraulic control providing for regulating time intervals between successive cycles of operation of a clutch controlled device comprising a source of uid pressure, adjustable valve means for controlling the application of said source of iiuid pressure, a clutch actuating cylinder, a timing cylinder, conduits for connecting said source of fluid pressure with said timing cylinder and with said actuating cylinder means controlled in accordance With the position of said device substantially upon completion of a cycle of operation thereof for moving said valve means to -a position where iiuid is supplied to said clutch actuating cylinder to cause disengagement of the clutch, and means actuated under the control of said timing cylinder for moving said valve member to another position after a predetermined time interval for supplying pressure uid to said clutch actuating cylinder to eiect engagement of said clutch for a subsequent cycle of operation.

5. A hydraulic control providing for regulating time intervals between successive cycles of operation of a clutch controlled device comprising a source of fluid pressure, adjustable valve means for controlling the application of said source of liuid pressure, a clutch actuating cylinder, a timing cylinder, conduits for connecting said source of fluid pressure with said timing cylinder and with said actuating cylinder means controlled in accordance with the position of said device substantially upon completion of a cycle of operation thereoffor moving said valve means to a position Where fluid is supplied to said clutch actuating cylinder to cause disengagement of the clutch, means actuated under the control of said timing cylinder for moving said valve member to another position after a predetermined time interval for supplying pressure iluid to said clutch actuating cylinder to effect engagement of said clutch for a subsequent cycle of operation, and means operable for adjusting the time interval established by said timing cylinder.

6. A hydraulic control providing for regulating time intervals between successive operations of a clutch controlled device comprising a source of fluid pressure, adjustable valve means for controlling the application of said source of iluid pressure, a clutch actuating cylinder, a timing cylinder, means i'or supplying fluid under pressure in one position of said valve means to said clutch actuating cylinder to cause engagement thereof, means for also supplying pressure iiuid in said position of said valve means to said timing cylinder, means operated in a predetermined position of said controlled device for actuating said valve means to another position, means operable in said other position of the valve means for supplying fluid under pressure to said clutch actuating cylinder to cause disengagement of said clutch, means also operative in said other position of the valve means for terminating supply of pressure fluid to said timing cylinder, a leakage port for discharging fluid from said timing cylinder at a controlled rate, means operable after the discharge of a predetermined quantity of fluid from said timing cylinder for restoring said valve means to its first mentioned position, and additional valve means having a plurality of adjustable positions providing for automatic intermittent operation of said clutch actuating cylinder and for continuous operation thereof in clutch engaged position.

1. A hydraulic control providing for regulating time intervals between successive operations of a clutch controlled device comprising a source of iiuid pressure, adjustable valve means for controlling the application of said source of fluid pressure, a clutch actuating cylinderfaftimingy cylinder,V means for. supplying uidundery presel sure in one position of said valve means -tosaid s clutch actuating cylinder` to r cause engagement, thereof, means for also supplying pressure fluid in said position of said valve means to said timing cylinder, means operated in a predetermined position of said controlled device for actuating said valve means to another position, means operable in said other positionof the valve means v for supplying fluid under pressure to said clutch` actuating cylinder to cause disengagement Lof said clutch, means also operativi/ein said other positionrrof the valve means for terminating supply of pressure iiuid to said` timing cylinder, a

leakage port for discharging uid from said timing cylinder at a controlled rate, means operable after the discharge of a predetermined quantityY of fluid from-said timing cylinderior .restoring said valve means to itsiirstA mentionedr position, and manually operated means. for-additionally controlling the. supply of fluid` pressureand have. ing a plurality of positions, 'providing for. said-i. controlled actuation of said clutch cylinder and.V

for maintaining said clutch cylinder in .disengaged position.

8. A hydraulic controlprovidingfor regulating time intervals between successive operations of `a` clutch controlled device comprisinga sourcegofuid pressure, adjustable` valve meansforA con-f trolling the applicationofsaid sou-rce-of.-fluid pressure, a clutch actuating cylinder, atiming cylinder, means for supplying nuid underpressure in one position of said valve means tosaid clutch actuating cylinder to cause engagement thereof, means for also supplying pressure fluid in said position ci said valve means to saidftimingv said clutch, means also operative in said other position or" the valve means for terminating sup-- 9. A hydraulic control providing vfor Nregulating i:

time intervals between; ysuccessiye operations'ofa clutch controlled device comprising asourcei, of fluid pressure, adjustablevalve,meansfor :con-. s trolling the applicationgof said source offluidi pressure, a clutch actuating .cylinder, :ai: timing,y

cylinder, means for supplying fluid pressure'insP one position ofv said valve means to saidclutch actuating cylinder to cause engagement .thereon means for also supplying iiuid pressure in. saidf position of said valve kmeans to said timing` cylini der, means operated in a predetermined position of said controlled device for actuating said valve means to another position, means operable-in i said other position of the valve means for supply ing fluid under pressure to-said clutch actuatingcylinder to cause disengagement ofsaid-v clutch-,- means also operative in said Vother rposition of-- the valve means for terminating supply ofpressure fluid to said timing cylinder, a leakage port-- for discharging fluid from said timingcylinder@ at a controlled rate, meansI operable after the discharge of a predetermined-,quantityof fluid; from said timing cylinder for restoring said Valvey means to its rst mentioned positiomand a manually adjustable preselector valve member having a pluralityof positions ofA adjustment for con'-V trolling the supply of pressure fluid to said clutch actuating cylinder to provide for said timed clutchA engagement in one position, for continuingV enf gagement in another position,.and for continuing t disengagement thereof; in a ,third position.

CLARK SCHOLL. u

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