US2608823A - Hydraulic control apparatus for adjusting and locking mechanism - Google Patents

Description

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H www www w, kv m. o 2 O 5 d o o o e 9 m Q uv o en Q 1|. .l o o o o .nl u u n x.. 2, m Le E s l o .L M H I m s Sept 2. 1952 H. F. SILVER ErVAL 2,608,823

' HYDRAULIC CONTROL APPARATUS FOR ADJUSTING AND LOCKING MECHANISM Original Filed May 28, 1947 4. Sheets-Sheet 2 amid @270km (7a/wmf 7266262 ,4MM/Mm iormy Sept. 2, 1952 H. F. SILVER ETAL 2,608,823

HYDRAULIC CONTROL APPARATUS ROR ADJUSTINC ANO LOCKING MECHANISM IWA lllih Q Q -M 29 www@ Sept. 2, 1952 H. F. slLvER ET AL 2,608,823

- HYDRAULIC CONTROL APPARATUS FOR ADJUSTING AND LOCKING MECHANISM original Filed May 28, 1947 4 snee'es-sneet 4 dZZamy.

Patented Sept. 2, 1952 -nYpaAULIc coN'rRoL aerannrnsroa Anins'riNd AND' LOCKING` MEci-mNisM' Hamid F'. Silver and-:Clarence Steele, Eenve,

Coio.,'assignois" to Joy lIVIanufacturinug Cornpanyga corporationof Pennsylvania Continuation off application Serial No. 750,982,

1949, Serial Noel-2928,12

Our invention relates to hydraulic operating and control apparatus, and particularlylto' such apparatus which is especially, thoughjnot exclusively, adapted.l to the operation andv control' ofmining apparatus.

Inl the copending application of Harold Silver, Serial No. 11,688, filedFebruary 2'7, 1948 as a continuation-impart of the Harold F. Silver' application serial No. 750;.981 Knowabandoned),

ie claims. (c1. toaster-) This applicationvNovember 28,

ing .advance and retraction, and this'turntable' is provided w'ith hydraulic means for turning it on a vertical axis, so'that the disintegrating means may actlon the face' upon; number of differently angularly positionedv lsections '0r bands, andlvfcu'mulatively, .infa' relatively YsrnallA number off'attacks upon 'the facejadvance the v ,length of'vthe entry 'or' thedepth kof the room a` distance equal tothe horizontal depthA of a filed 'May 28, 1947 for Apparatus andlMethodfor 10 sectiori'or band.' Mining Coal or Other Minerals from the. Solid, `lvloreover, to hold the turntable against in' there is disclosed an apparatus'for mining coal" advertentchange of horizontal angle, lfiydrau-lior other minerals from the solid,` which appacally controlled-braking means is provided, with ratus includes motor operated vein-disintegratl control means adapted to supply fluid' to and to ing means in the form of chain circulated cut- 15 vent it from such hydraulically `controlled brakter bits, so arranged and in such numbers that ing means in such a manner thatduring the time in the illustrative l apparatus shown they are When horizontal swinging of the turntable is be' operative to disintegrate, by cutting and/or tearing effected, thebraking means can be released, ing;out,rthe coal (for example) to awidth on the butbe applied when no change in lateral 'angle` order of a couple of feet andtoa depth oi'per- 20 is desired. 4 Y l l haps. eighteen inches` to twoifeet, and in verti- The `apparatus mentioned alsdincludesa tilt'- cal bands of theheigh'tof the room or entry in inearrangement, hydraulically operatedgfor which mining is progressingl `The bits are supthe nose aridcleanupf-devicesof the app aratus,v ported during operation on guiding means which nCludng; a. Single-actingylnder With means l causes them to traverse elongated` orbits,Y and 25 fOr-Supplyllgfild'to it tofliftfthe-DMS Whose their guiding means isl mounted forthe swinging positionsit controls and 'ior'ccnnectingthecyl# f of its-forward, free end about a horizontal axis,A f nder withV exhaustso thatthe -parts which it isf and hydraulic means is providedy for swinging adapted to Vlift may. rest of their own' weighton the-guiding means upwardly by power and perthemine bottom. K' 1 y 5 mittin'g` its lowering vby gravity, and this hy- 30 Again theapparatus'includes a vdouble-actirigf; draulic means is controlled bya manually` ad- -OOI jak and a single-acting IOO- MCR, and 9/ instable Valvev Which'ig' movam into positions to single-acting cylinder andfpiston mechanism for supply. fluid to the hydraulic swinging meansv to Controlling the ti1t-heig`ht of'the rdeliyeryLend--M effect rupward swing of the disintegratin'gmeans, 0fA a tail conveyor WhelO'n sfe'nployed, with f to vent fiumi-rom, Such Swinging means,k andro' 35 suitable' valves manually controllable itc provide. out off the' connection of such' swingingmeans for the appropriate ud supplying andi connecfro'm" both supply and exhaust. A furthercon-l tion to exhaust ofthe hydrauliccontrol devices.'` trol r'rieans is' also provided for automatically Tri Such appl'ct'fl) hOWVIEBl-Oflthe Valv? v cutting von 'the supp1y ofk fluid to suon swinging mechahismsdislosed are of a type Whichroiermeans'when the desired elevation is reached, 40 ates in midposition of the valve relative to its casand this control'means may be adjustedfto cause'` ing to permita flwfrom the pump'constitutmg interruption of fluid supply at diierent desiredl Athe source of'fiuidbacktoithe iiuid tank or reser'- elevations. Voir, and so constructed that whenever any valve1 In the apparatus mentioned, the disintegrate is moved to admit fluid to operatethemechaingmeans and its driving motor andfitsupwa'rdA 45 nismit controls, it'.` interrupts such iiow 'and swinging means are mounted' for forwardJ feedI causes a pressure to be'built up in the supply line, and'fOI TBIaCGOH by means 0f d'ubl-atllgv so that'the fiuidisdelivered, at a pressure deterhydraulic means,V and` valve means is provided minedl by a relief` valve, to the mechanismwhichf for' cuttingy oi fluid' supply from both ends vof has been connectedfto supply. y v said doubleactin'g means, and forv supplying fluid 50 This present application discloses' n.analogdus to' etherend while connecting thevother end toV hydraulic operatingand conti-oi` system, using, a' exhaust.. `There is further provided a turntablev type of control valve vfor eachof-the several-opreiative'to which the oisintegrating..apparatus.is.. orating.- mechanisms andthe brakingmeohaii'sm swungV vertically 'and advanced and. retracted.' different from thevalveunit'sof saidfSilver 'sole and which guides" the disintegrating means dur- 55 i application,v and'havinga separate' bypass control valve controllable by at least the principal operating valves, and having a brake control valve having a novel control thereof by the horizontal swing control valve. All of the control valves, according to our invention, may control the bypass valve, or only a part of them may so operate, certain manipulations of another valve or other valves providingfor the closure of the bypass valve when the development of an operating pressure is desired, and said bypass valve being otherwise left in a position to avoid useless Waste of power and to prevent heating of the hydraulic iluid to no purpose.

From what has been said it will be evident that an object of our invention is to provide an improved hydraulic operating and control apparatus. It is another object of our invention to provide an improved operating and control apparatus for a mining apparatus.. A further object of our invention is to provide an improved hydraulic operating and control apparatus including one or more primary control valves, and a normally open bypass valve arranged to connect the main pump discharge to the return line and having improved control means governed by said primary control valve or said primary control valves. Another object of our invention is to provide an improved hydraulic operating and control apparatus for an apparatus including mechanisms for effecting certain movements and having associated means for preventing the inadvertent making of such movements, with a coordinated control of such moving and movement-preventing means A further object of our invention is to provide an improved hydraulic operating and control apparatus including at least one primary operation controlling valve, a bypass valve, and a holding control valve, with coordinated control of said valves so that said primary operation control valve may control both said bypass valve and said holding control Valve. Again, an object of our invention is to provide an improved hydraulic operating land control apparatus including a bypassvalve, and at least two primary control valves, one always operative to control said bypass valve upon its own operation to deliver uid to a device controlled thereby, and further operable to develop an operating pressure for distribution by the other primary control valve, which is not so arranged as to exercise itself a control of such bypass valve, as hereinafter described. Other objects and advantages Aof our invention will hereinafter more fully appear.

In the accompanying drawing, in which there is shown one illustrative form which our inventionV may assume:

Fig. l is aside elevation of a machine of the character which forms a portion of the subject matter of the Harold F. Silver application above mentioned.

Fig. 2 is a plan view of the machine.

Fig. 3 is a diagrammatic View of a hydraulic system in which our invention, in its illustrative form is embodied.

Fig. 4 is a face view, with parts omitted, of a portion of our improved controlling apparatus,

4 the line 8-8 of Fig. '7, with parts shown in construction.

Fig. 9 is a vertical section on the plane of the' line 9-9 of Fig. 7.

Fig. 10 is a section on the plane of the line I0-I0 of Fig. 7, with parts omitted.

Fig. 11 is a vertical section on the plane of the line II-II of Fig. 7, with parts omitted.

Fig. 12 is a central longitudinal vertical section through one of the controi valves.

Referring to the drawings, and rst to Figs. 1 and 2 thereof, it will be observed that upon a poWer-driven-crawler supported frame I there is mounted a rotatable turntable 2 supporting a reciprocable guide frame 3 carrying a motor 4 constituting the driving means for a disintegrating apparatus 5, which is swingable in vertical planes about a horizontal axis 6 by a pair of single-acting swinging cylinders 'I, 'I of which but one is visible in Figs. l and 2. The reciprocable guide frame 3 is fed forward and retracted by a pair of ' feed cylinders 8, 8, one partially visible in Fig. 1 and both shown in Fig. 3; and the turntable is rotatable in opposite directions by a pressure fluid motor such as the selectively effective horizontal swinging cylinders 9, 9, neither visible in Figs. l and 2, but both shown in 3. Brake cylinders I0, I0, not visible in Fig. 1 or 2, but shown in Fig. 3, are provided, as more fully disclosed in said Silver application, for holding said turntable against rotation. A cylinder II controls the height of the nose N and of the cleanup scrolls S at the forward end of the base of the machine. A vertical, single-acting jack cylinder l2 is provided to hold down the rear end of the apparatus when desired and to cooperate with a double-acting bottom jack I3 in giving stability to the whole apparatus, said lower jack I3 being operative alone to prevent the front end of theA apparatus. rising and to hold it down as may be necessary. A single-acting cylinder I4 controls the level of the delivery end of a tail conveyor I5.

All of the foregoing cylinders are adapted to be supplied with hydraulic fluid under control of valve `means later more fully described. A reservoir or tank 2l is suitably mounted on the frame I and constitutes a source of hydraulic operating uid. A conduit 22 connects the tank 2| with the intake of a pump 23 which is driven by a motor 24 (Figs. l and 2) and which discharges .to a discharge line 25. A relief valve 2S having a return connection 2l' to a return line 28 Vleading back into the tank 2l is provided for the purpose of limiting the hydraulic pressure supplied to the various operating cylinders. This relief valve is of the flow-through type and opens only when the desired pressure is exceeded, and normally passes all of the fluid delivered by the pump to a line 29 which constitutes. through various branches, a supply line for the control valves which govern the operation of the cylinders and pairs of cylinders previously mentioned.

From the supply line 29 there leads a connection 30 which ends in a T 3|, one arm of the head of which is connected at 32 to a valve mechanism 33. This valve mechanism is a bypass valveV which is operative to prevent heating of the oil, by allowing the oil to pass freely back to the return line 28, except when fluid under pressure is required to effect operation of one of the control mechanisms, and valve manipulation to elect such operation is performed. The bypass valve mechanism 33, which may be of essentially the same general type as all of the other valve mechanisms, includesa valve casingi` 34. having abore in which a valve element.

35- ismovable inone direction by a stem. 31. A

spring. 38 normally maintains the valve elementv f control valve mechanisms may advantageously be described. in some detail. These each include (see Fig. 12) a casing 4I having a valve receiving bore 42A therein and vhaving opposite` heads 43 and 44.. A valve element.45, having spools 45 andi4.'I`spaced by an annular groove 48, is reciprocable in the bore 42. A stem 49 connects the valve through a loose pin and slotv connection Eil-with an operating lever 5I whose upper end' is Vp'ivotally mounted at 52 in a projecting bracket 53v shown as'formedon the head 43. Centrally ofjgthe bore 42- there is a groove 55 with which a threaded bore-55 communicates. actsas a supply groove.l Spaced annular grooves 5I` and 58 are'arrangedatY opposite sides ofthe' groove 55 and threaded bores 59 and 'S5 com" municate with the :grooves 5'! and 58 respecftively; Depending ,uponv whether the cylinder and: pistonmechanism' controlled is double' or single acting, both or one of these bores is `con-k nected tothe cylinder, either bore not used being p1ugged; Near the ends of the bores i2t other annula'rgrooves 6I and 62' are provided, and these are connectedwith each other and with a further internally threaded opening 63.l The threaded openingy serves for a connection with the return line 2'8. Thervalve element 45 is normally maintainedin mid position, in which position the spools 45 and 4'I vcompletely cut oicommunication between the grooves 51 and 58 and the supply groove 55 and the exhaust grooves 6I and 52, and in vwhich positiony no lflow from.

thefgroove55 is possible. For holding theyalve This groove element 45 normally in its mid position the Yary rangement shown at the left hand side of Fig. 12 isprovided. The valve has secured to it a stem 65. to Vwhich there is loosely held, as at 66, a

flange-carrying element 61. Between the flange Btl-.on this element and a plate 69 through which the stem 65 extends, a spring 'I0 is arranged. This spring-1 normally maintains theV plate 69 against va fixed plate 'I secured between the head 44` and the body 4I. A nut 'I2 is adapted to engage the plate ES) to effect compression of the spring when the valve element is moved to the left inrFigvlZ,l so that a spring pressure to return-'the valve element to central position will be produced by the leftward displacement of the valve element. When the valve element is moved to the right in Fig. 12 the flange 68 compresses the 'spring so that the valve element will be moved back to its central position when the handle 5I is released. This general type of valve is used throughout, in the illustrative embodimentv ment v'4512 for: controlling-the feeding'and traction cylinders 8;V e .e

A valve mechanism83, including avalve elefment 45s; for ccntrollingthel swing cylinderslll;

A` valvemechanism 84,y including. avalve eley ment 4.5b,for controllingv the.- brake cylinders Ill;

A-valve-mcchanism for controlling theno'se'f positioning Vcylinder I I; l

A valve mechanism 85 forrc'ontrolling theetop vjack` I2;

Af valvemechanism S'I for controlling the; bot-itom-l jack` I3,

And a vvalve mechanism 8`8`for controllingfthe-'- tail conveyor elevating 'cylinder I4.

It will ben'oted that the' valve elementsiinl-v eluded-in the valvefmechansms STI, 82, 83`- anclill*v are identi'edabovelby the additionpfletters== Y respectively the letters'r, j, sand-b: Aslthereis Y occasion-t0 referfto otherl elements orthese valve mechanisms, the same letters'will be used lto vides#Y ignatef the particular.parts.l If occasion yarises`l` for-referring to particular elements ofthe 'valve` mechanisms 85,r 86; 8l' andL 88;..their particular' elementswill befin such case; identified bythev supplemental letters n, t7', biand c: Q Before describing the relation v'ofifthje va'lvef mechanisms-8ll etc. tothe. system, it'may bere'- notedthat the bypass .valve mechanism 33,^whenA the valve. element 35i-.hereof (which element correspondsto the'elements 45 in structure) is in it`s upper position, operates to permit a; free flowithrough. of fluid' from the pump dischargeli'ne 29 bacli'through the` connection 39`tothe return line 28; and accordinglyfthe pump 23" does not" operate'` against any substantial .back pressure.

When,1hwe.ver, thevalve. elementSS is forced` downwardly against lthe action offthe spring. 38", intoits lower position,. then all iiow .throughftheiy fconnection 3-9 will be interrupted andapressure will build up. in the pump` discharge line 29 to sucha value as is determined bythe setting-of.

the relief valve 25, and anl operating pressure:`

adequateqfor the various-.functions to be p er-f formedfwill be, made available. :With reference:

to the springft may be Saidthat thisisbutv discharge'lineto the return line;

Before describing the valve mechanisms8l`,f,8l2

83,:w e. may describe the valve mechanism 84,

. which servesto control'thesupply and venting ofyuid relative to the'brake'cylinders I0, doingthisbecause of the fact that the T 3I heretofore mentioned also constitutes the supply element'for` the'yalve mechanism 84, and because it will be' groove 55h` and that thegrooves SIb and 62h are connected back to Vthe return line 28A by a conduit 90: The threadedopening Sb is plugged,

whilethe threaded opening 59h has a conduit 9| connecting it, through branch connections *92/ and 'Si-3, to the bottoms' of the brake cylinders' Accordingly, referring'to Fig. 3it will bek I0. observed that in the'lower'position of thevalve 45h there is a connection-from the supply line 29lrv through connection 3i), the T head 3I, the

grooveb', thegroove 48b'in the valve 4511, thel groove5lb andthe conduit 9| and branch conduits 92and 93, tothe brakecylinders I0, in so that, when the pumpk discharge' line is undei?" pressure, the fluid therein may apply aholding .force to the turntable 2 andY prevent the latter from rotating. When the valve 45h is moved upwardly in Fig. B-actually in a different absolute direction, as will later appearthe brake cylinders I may be vented by the connection of the conduit 9| with the exhaust groove SIb and a resultant venting of fluid to the return line through the conduit 90.

Further, before going on t0 the descriptionl of the structure and mode of operation of the Valve mechanisms 8|, 82, 83 etc. it may be mentioned that the valve mechanisms 33 and 84 are arranged on parallel axes, with the-valve mechanism 84 arranged above the valve mechanism 33. The normal position of the valve 45b as just explained is such as to permit connection of the supply line 29 in communication with the brake cylinders, but there will be no pressure built up in the brake cylinders unless the valve element 36 is moved to its lower position by the application of the requisite thrust on the Valve stem 31. The valve 45b is shown in Fig. 3 as connecting the supply line 29 with the brake cylinders, but if the bypass valve 36 is not in its lower position there will be no pressure to apply the turntable brakes. If this bypass valve 30 be closed without a change in position of the brake control valve 45h, the brakes will be applied and will hold the turntable element 2 against turning. This is desirable during sumping and withdrawing and during upward swing under power or the disintegrating apparatus 5, and we provide, as later described, arrangements, eifective whenever fluid is supplied to the raising cylinders 1, or t0 the feeding and retraction cylinders 8, for closing the bypass -valve without changing the position of the brake control valve 45h from that in which the supply line is connected to the brake cylinders. It is, moreover, desirable, notwithstanding the fact that the bypass-valve 36 must be closed to secure needed working pressures, that when there is-to be fluid supplied to either of the cylinders 9 to swing the turntablethere shall be a shifting of the brake control valve 45t to vent the brake cylinders to the return line 28, and so means for doing this is includedmeans which shifts the valve 45h to its upper position in Fig. 3-

when the swing control valve mechanism later described in detail supplies fluid to either of the cylinders -9.

4For the purpose of controlling the supply of fluid to the cylinders 'I and thus raising the disintegrating apparatus, i. e., swinging it upward, the valve mechanism 8| is provided. This has a connection |00 from the supply line 29 to its cen-l tral groove 551'. One arm |0| of a T-shaped connection |02 serves to connect the rexhaust grooves 6|r and 621 with the return line 28. The openingmof the valve mechanismSl is plugged, while a conduit |03 threaded into the threaded opening 59 leads past a special automatic valve mechanism |04 to branch conduits |05, |05 leading to the raising cylinders '1. The valve mecha-- nism |04 is per se a conventional one, and is effective when actuated to interrupt fluid ow to a desired height the valve mechanism v|04 shuts olf the flow of uid to the cylinders 1 even though the valve 451' still connects the conduits |00 andl I 83, and that whenthe valve 45r is moved to connect the conduit |03 with the return line 28 the fluid is permitted to flow at a suitable rate from the cylinders 'i past the valve mechanism |04 and back to the reservoir 2|. valve 451` is shown in closed position, and, as shown in Fig. 4, the operating lever 5|1` may be moved to effect opening by the valve T of communication between the conduits |00 and |03, to interrupt such communication, and to vent the conduit |03 back to the tank.

The valve mechanism 82 controls the flow of fluid relative to the sumping and withdrawing cylinders 8, and is adapted to cut these cylinders off from communication'with supply and exhaust, to supply fluid to one end of each of these cylinders (the forward end) to effect sumping, and to supply fluid to the other end of each of these cylinders (the rear end thereof) to effect retraction. Of course forward and rearward feeding operation is also possible for adjusting purposes as well as for actual disintegratng operation. The valve mechanism 82 receives uid from the line 29 through a conduit I I0 and through one branch ||I of this conduit which opens into the central groove j. AThe other arm |12 of the T connection |02 serves to connect the end grooves 6 If and 62j with the return line 28. The annular groove 58f is connected by a conduit I |3 with the rearward ends of the'cylinders 8, and the supply of fluid through this conduit will effect retraction of the disintegrating apparatus 5. The annular groove 51j is connected by a conduit H4 to the forward ends of the cylinders 8, and fluid supply through the conduit I I4 effects sumping or forward movement of the disintegrating apparatus 5. It will be noted that the rearward ends of the cylinders 8 are connected in communication with each other,

' and that the forward ends of these cylinders are connected in communication with each other.

The valve 45]c is shown in mid position in Fig. 3,y

and when thrust inwardly it will effect a supply of fluid to the conduit H4, while connecting the conduit I|3 with the return line 28, and thus effect forward feed or sumping, While, when the valve 45j is pulled outwardly, it will supply fluid through the conduit ||3 and vent fluid through the conduit I4 to eiect retraction of the disintegrating apparatus 5. In -contrast to the cylinders 1, it will be noted that the cylinders 8 are double acting.

To supply fluid alternatively to the single-act-l ing cylinders 9, which are operative to effect rotation in opposite Vdirections of the turntable 2, and to elTect venting of fluid from either of these cylinders while uid is being supplied to the is shown higher in Fig. 3. A conduit |24 conf nects the annular groove 51s with the other of the cylinders 9. It will be clear that when the valve 45s is thrust inwardly from the mid'position shown in Fig. 3, fluid will be suppliedv through the conduit |24 to the cylinder 9 which appears lower in Fig. 3, to effect turntable rotation in one direction, while the conduit |23 then vents fluid In Fig.V 3 the rangement of parts.

9 through the connection 122 back to the return line 28. Pulling of the valve 45s outwardly-to the left in Fig. B-will result in supplyfof fluid through the conduit 123 to the cylinder 9 which appears nearer the top ofFig. 3, and Will concurrently vent through the conduit 124 the other of said cylinders 9 by way of the conduit 122 back to the return line 28. It will thus be evident that the valve 45s may be moved to positions to supply iluid to either of the cylinders 9 While venting the other, and to a further position cutting oir fluid supply from both cylinders `and also interrupting simultaneously both connections with the return line.

In the mechanism illustrated and shortly to be described, Vprovision is made for the operating mechanism of each of the valves 1151*, 45j, and 45s,

.when such operating mechanism moves itsrebe arranged and connected, if desired, sovthat th operating levers 5111 51M', V511171510 might'. all control the bypass valve 3B, but this is not necessary, since these valvernechanisms are like those which have been described, eachadapted, if only moved toycentral position .from a 'fluid supplying position, to trap fluid in their respective devices 11, 1.2,13V and 14, andsince, moreover, when the supply "of fluid under pressure* to any of the 3devices 11, `12, 13 and 14 is necessary, one of the valves 451', 45j or 45s will either be in faposition causing the building up of the .necessary 'pressure in the mainsupply'line, or the valve 45j may be moved, to avoid or end free interconnection of the supply line 29 with the return line 28, in a direction to tend to .cause the supplyv of further uid to the end of .the cylinders 8 which are already lled'with fluid, so that, though the valve 45j, by its movement, then causes closure oi the valve 35, there will be produced no movement of 4the mechanism which the valve 45j controls,

because that mechanism has already reached its limit of motion. Thus, to repeat, it is within the scope `of our invention 'as dened in certain of the appended claims, to hook up the controls of the valve mechanisms 85, 86 and `88 the sameA as the control of the valve mechanism 8| later described, and thus to control the valve 36, and

to connect up the control of the valve mechanism 51 similarly vto the control of thevalve mecha nism 82, but the control system described, in

which the valve mechanism 85 is operative to control only fluid supply vandventing from the cylinder 11, the valve mechanism 88 is operative to control only iiuid supply and venting with respect to the cylinder 12, the valve mechanism 88 .is operative to control only the supply and venting of fluid relative to the cylinder' 14, and the valve mechanism 8'1 is operative to control the supply and venting of uid with respect to the opposite ends of the cylinder'of the jack 13, is entirely adequate, and renders the control system more flexible and more simple in its ar- The valve devices S1, 82` and 83 are arranged parallel to each other with their axes'ina common planea horizontal plane, as shown in Figs. 4 and 5. They may be secured in desired relation to eachother by bolting them, as'at 169, to a horizontal upper plate 181. Each has a manually operable control lever 51, andthe pin and slot connection 50 of this control lever, with the stem of the valve which it operates, may be provided with `some lost motion in order that there may be some initial delay in'movement of the valves 45T, 45) and 45s until the Valve or valves indirectly .controlled by theirmovement have' been moved to the desireddegree rEach loperating'lever A51 is traversed, Aaty a point outwardly 4of its connection with 'the valve stem which itactuates, by an opening A16,2 in which a bentjrod is -`received. The bent rod 1associated with the valve mechanism 81 vmay be identified as '163r;. theorie associated with the valve mechanism r82v as 1831, and the one associated with the valvemechanism 83 Vas 163s. Each of these rods is piV'ot'ally connected Witha cam, the cam associated with the rod .1631 being a single-faced cam 184 mounted vat 165 on a stud 186 `projecting downwardly from a `horizontal plate 161; said cam being adapted to cooperate with a roller .198 y journaled'on a stud v169 carried 'by a block 119 which is secured, as at 111, toa horizontal, longitudinally movable thrust rod 112. The cam associated with the valve mechanism 82 is designated 1'14 and is of the vdouble type, having surfaces 1'15 and 1'16 each adapted, on appropriate swinging of the cam about a stud or ypivot 1'1'1 carried by the plate 161, to move a roller 118 mounted on a block 119 secured at 180 tothe rod 1'1 2. The block 1'19 carries another roller 181, which is received within an elongated notch 182 formed in a plate 183 secured, as at 184, to the plate 197. It may be noted that the plate 16'1 Ais notched out, as at 185 and 186, to provide.

spaces within which the roller |68, and the rollers 1'18 and 181,*may respectively move. The coaction of the roller 181 with the rnotch 182 keeps the rod 112 from rotating under the action of the cams.V The bent rod 163s actuates a cam 188 pivvotally mounted at 189, ina manner similar to the other cams, on the horizontal plate 151. The cam 188 isalso a double cam and has oppositely disposed cam surfaces 199 and 191, and these surfaces are adapted to cooperate with a roller 192, which is mounted on the lower end of a horizontally pivoted lever 193 and which engages a roller 194 rotatably mounted on a block 195 secured, as at 198, to the thrust rod 1'12. The roller 192 has a relatively spherical periphery so that angular movement of the lever 193 will not materially change its effective diameter. The upper armrof the lever 193 is drilled, as at 191and is normally held in engagement with a stop collar 198 fixed on a rod 199, which extends through the hole 19'1. The rod 199 extends through an opening in a perforated guide and support plate 200, which. is secured to a plate 20.1 by which the plate "161 is carried. Guide bearings 202 and 203 for the rod |12 are also secured to the plate 29| below the plate 181. The rod 199 carries uponit a pair of springs 2 Bl! and 2915., the .former received between the .upper arm of the lever 193 and an adjustable nut and Washer arrangement 296 carried at the left hand end of therod 199 in Fig. 7. This spring is placed under a certain initial tension and at all times .tends to maintain. the

Y drilled upper end of the lever 193 againstjthe 11 of washers 261 which rest against a connecting element `68 shown -secured to the right hand end ofthe rod |99 in Fig. '1., rIhis connecting element 228 is pivotally connected at 263 to the stern- 4917 of the-valve 45h. it willbe evident that the spring 2 05 will normally maintain the collar |98 against the plate 269 and thus predetermine the position of the Valve 45h, holding it normally'in the position shown in Fig. 3. When thelever |93 is rocked counter-clockwise in` Fig. '1 it will act through the spring 204, which is under somewhat greater compression than the spring 205, to move therod |99 to the left and bring the valve 45h. into a position to interrupt the supply of -fluid through'the conduit 9| to theg brake cylinders i8 andto vent .fluid from the brake cylinders |i by way of conduits A92, 93 and 8|, the grooves 51h and 6|band the connection 93, back to the tank.y lBychanging thepcsition of the nut vand washer arrangement 2.86 and by varying the number of washers 291, the tensions a lock nut 2| l, and the head of the screw-2|!) is adapted to exert a thrust on the end of the valve ,stem-31 when the thrust lrod |12 is moved to the right in Figs.l 7 and- 9. .The rod |12 isv held against movement to the left in Figs. 7 and 9 by the cams, and the end of the screw,V 2|, through its engagement with the valve stem 31, determines the position of the bypass valve 36. When any of the cams |64, |14 and |88 is rocked about its pivot in a direction which will attend movement of the valve with which it is associated to eiect fluid supply, the rod |12 will be moved to the right in Fig. '1 and will push the stem 31 to the right in that figure and move the bypass valve 3S to shut off the free passage of uid between the pump line 29 and the return line 28. The cams |874 and |14 act directly on rollers which occupy xed positions relative to the rod |12. The cam |88 obviously acts directly on the roller |92, and through that roller upon the roller |914, whichthrough its mounting on the block |95 is operative to move the valve stem 31. Thus the cam |88, on movement from its .mid position, both actuates the brake valve 45h and the bypass valve, venting the brake cylinders, r

and effecting closure of the bypass between the supply line 29 and the return line 28 so that an operating pressure will be built up.

Before summarizing the mode of operation of the structure described, it may be mentioned that y the forward end of the cylinder il is connected by a conduit 2|3 with the valve mechanism 85, and that said valve mechanism is connected by a conduit 2|4 with the return line 28. In order lto-distinguish the return line from the supply line to the mechanism controlled by the valve mechanismV 85, theinternal, dual connections of the return line are diagrammatically shown outside the representation of the valve mechanism B5, and also this same practice is followed with respect tothe valve mechanisms 86, 81 and S8. The operating lever m associated with the valve mechanism 83 is desirably maintained in a position to connect the forward end of the cylinder with the return line, thus allowing the nose s tructureN and the scrolls S to rest of their own weiglrtv upon the mine bottom. Suitable releasable detent means, herein illustrated as a pivotally supported lever 2|5 engageable with a stop 2|6 on the lever 5m, may be provided, if desired,

normally to hold the valve of the valve mechanism in the position mentioned. A supply connection 2|1 from the pump discharge line 28 isv adapted to supply iluid to the valve mecha- -nism 85a supply connection 2|8 from the ysupply line 29 leads to the Valve mechanism 81, a supply connection 2|9 leads from said supply line 29 to the valve mechanism 86 and a supply connection 220 leads from said supply line 2S to the valve mechanism 88. The valve mechanism 81 has a pair of fluid supply and venting connections 22| and 222 leading to the opposite ends of the bottom jack I3 for supplying fluid to force the jack into operative relation to the mine bottom and to retract thejack. The return line connection from the valve mechanism 81 is shown vat 223. A single supply and return connection 225 connects the valve mechanismS' withv the bottom of theroof .jack cylinder l2. The return. connection from the valve mechanism 86 to the return line 28 is shown at 226. A2A single iiuid Ysupply and return connection 228 connects the valve mechanism 8S with theta-il conveyor raising cylinder I4.. A return connection 229 connects the Valve mechanism 88 with the return line 28. The unused threaded bores 6|] on the valve mechanisms 85, 85 and88 are pluggedby the plugs 230, 23| and 232.

With the parts all as shown in Fig. 3, the'nose N and scrolls S may lift and lower with changes in the level of the mine bottom, and all of the other mechanisms will be having no power applied to them, though fluid may be trapped in the cylinders 1, in both'ends of each of the cylinders 8, in both of the cylinders Q, in both ends of the licor jack I3, below -the piston in the roof jack cylinder |2, and in the tail conveyor lift cylinder I4. There will be no substantial pres,- sure in the. pump discharge line 29, and the brake cylinders l0, H) vwill be under only the low pressure which exists in the pump discharge line. Now, if the operator operates the handle 5|r associated with the valve mechanism 8| by pushing the same inward to admit fluid to the cylinders 1, 1, he will simultaneously exert a thrust on rod |631 and swing the cam |64, and the latter will push the thrust rod |12 and cause it to exert a pressure on the valve stem 31 and move the bypass valve 36 to a position to cutoff communication between the conduits 29 and 28, and accordingly there will be built up an 'operating pressure, which will act in the cylinders I6, I6 to hold the turntable 2 firmly against turning; but there will be no movement transmitted to the brake valve, and so the brakes will be applied while the disintegrating apparatus 5 is swung upward by the pressure fluid owing into the cylinders 1, 1. `When the desired elevation of the free end of the apparatus 5 has been attained, the valve mechanism |58 will interrupt the raising action, and the valve 45T may be returned to mid position.

In like manner, if the operating lever 5| f associated with the sumping and withdrawing valve mechanism 82 is actuated in either direction, the rod |63f will actuate the cam |14 and so bring about a movement of the thrust rod |12 so as to position the valve 36 to eiect the development of the requisite operating pressure in the line 29. Here again the brake control valve 45h would not be moved. If, however, the operator moves the lever Els associated with the valve mechanism 83 in either direction, the cam |83 will act upon the roller 92 and effect swinging of the lever |93 to move the valve stem @9b to shift the valve 45D to a position to cut oil the supply of nuid to and swinging movement.

` vented.

A lWord more asvto .the control by the lever |s associated with the valve mechanism 83: When, aiter the turntable has been broughtjto the de- Ysired angular position, the valve 45s isl moved back to-central position and the -bypass valve-3 6 has been allowed to open, itwillbe appreciatedthat the brake valve 45h will also be returned toits -position in which kthe brake cylinders` will have:

their lower lends-connected with the pump` discharge line 29. And,'while the turntable brakes will notv then be applied, they will -obviously immediately be appliedif either the valve mechanism -8I or the lvalve mechanism 82 be actuated to cause the supply of operatingluid to the cylinders which they respectively control. If it bedesirable to actuate any of the devices Il, |2, |3or .i 4 While the bypass valve isclosed due to the-position of one of the valves 451', lil'f-or 58, the required pressure will obviously be available. If such actuation be desired when each of the valves 351345,1 and 45s is in mid position, the .operator can, by moving the valve45f back tothe position from which it was moved to .central position, veffect reclosure of the bypass .valve without inconvenient consequences, because the . cylinders 8, ,8

.are .usually left at the endfof their travel when their control valve is centered, V,and soa return ,mechanismis in .the upper position-at which valve |04-is closed. Y

'From the foregoing .,descriptionit will be evident'that We have .provided a very effective control apparatus, one which permits ,avoidingheating of the hydraulic uid needlessly, one which Venables all of the necessary controls, one which eiects holding brake .applications when necessary and release of such brakes when swing is vto .be eilected, and one, which is simple, rugged, .and convenient to use. l

This is a continuation of application, Serial No. 750,982, filed May 28, 1947 (now abandoned) While we have in kthis application specifically described one form which our invention may assume in practice, and indicated a possible modicaton thereof, it Will be understood that this form and possible modification are disclosed for purposes of illustration only andythat the invention may be modified and. embodied invarious other forms Without departing from its spirit or the scope of the appended claims.l

What we claim as new and desire-to 'secure by Letters Patent is:` u

'1. In combination, in ga controlling yapparatus for a system including anelement to :be moved to different positions and to be held in such positions, cylinder and .piston mechanism for -chlanging the position ofsaid element, means lfor holding said element in different posi-tions to which it is moved including another cylinder and piston mechanism, a Vsource of fluid under pres- .sur-e, anda drain line, Anormallyopen bypass means, including a normally openbypass valve,

for-connecting the source of fluid under pressure with vthe drain line, a .-controlvalve mechanism vfor said rst cylinder and piston mechanismp-including `a valve structurally distinct from and movable bodily relative 'tofs'aid bypass" valve and having operating means andmovable b-y'its* loperating means from a normal position to con- .nect said source of fluid under pressure and said drain line to said iirst cylinder 'and piston mechanism Vto cau-se such cylinder vand piston mecha- `nismtochange the postiion of said element when :the source'of u'id'under pressure is vdisconnected to .said iirst cylinder and piston Amechanismas aforesaid, a valve mechanism Ifor said second cylinder :and piston mechanism` including a control valve and means fornormally maintaining 'f the latter in la position to connect ksaid second cylinder and piston mechanism with said source of iiuid under Ipressure to effect-the holding of said element in .a xed position vvhen'the source -Y-of iiuid is disconnected from said drainline, and

means operated by said -operatingimeans "when the latter is moved to actuatesaidl second `valve to supply `flu-id to the cylinder and piston mechanism which` it controls, for moving 'saidl third mentioned valve tofcau'se said second 'cylinder and pist-on mechanism to occupy' a 'positionfin ywhich it does not hold said element vagainst movement, each of said 'cylinder 'and -p'iston mechanisms having conduit means controlled by its .respectivevalve mechanism for connectingit "independently of the valve mechanismofdthe other'withthe ysource of Iiiu'id under pressure and said operative connections betweensaid valve operating means and saidby-pass, valve -actuated by said valve operating'means ata point ahead of .the operative connection of ,said valve operating rmeans with saidQc-ontrol valve mechanism. l l

12. In combination, V-in a controlling :apparatus for a system includingan element.-to`be moved to` diiie'rentposi'tions and to ybe held in; suchpositions, cylinder and piston mechanism for changingthe position ofsaid element', means for hold- Iing said element :infdiiferent positions to which itis moved including .another cylinder and piston mechanism, :a Isource vof iiuid under pressure, and a .drain line, normally open bypass means, in-

cluding a normally open --bypass valve, -`for. connecting -the source ofiluid lunder pressure with the drain line, a control valvemechanismvfor :said r.rst cylinder and piston mechanism includ- .ing ra lvalve structurally` distinct from and movable Ybcdilylrelative to said bypassv valve and-,having `operating means Iand movable by its operatiing means from a normal ,position toconnect .said source of fluid/under pressure and saiddrain lineato said .first cylinder and piston mechanism 4to Ycause `such cylinder- 4and piston mechanism to 1 aforesaid, a valve mechanism `for said second cylinder and piston mechanism including la control valve and means `for normallyvmaintaining the 2 latter in a position to connect said source of iiuid under pressure with said second cylinder and piston mechanism to eiect the holding of said element in a xed position when the source of -fluid lis Idisconnected from said drain line, Yand means operated by said operating means, when the latter is moved to actuate said second valve 1 to supply fluid to the cylinder and piston mech- -anism` which it controls, for moving said third mentioned valve to disconnect said source of `fluid under pressure from said second cylinder 'and piston mechanism and connect lthe latter tosa'id drain-line, each of said cylinder and piston mechv'wanis'ms having conduit means controlled by its `vrespective valve mechanism for connecting itindependently of the valve mechanism of the other with the source of iiuid underpressure and said Vfor a system including an element to be moved to different positions and to be held in such positions, cylinder and piston mechanism for changing vthe position of said element in opposite directions, means for holding said element in different AVpositions to Which it is moved including another cylinder and piston mechanism, a source of fluid under pressure, and a drain line, normally open bypass means, including a normally open bypass valve, for connecting'the source of iiuid under pressure with the drain line, a control valve mechanism for said iirst cylinder and piston -mechanism including a valve structurally distinct yfrom and movable bodily relative to said bypass valve and having operating means and movable by its operating means from a normal position selectively in opposite directions to connect said source of iiuid under pressure and said drain line to said irst cylinder and piston mechanism to cause such cylinder and piston mechanism to change the position of said element when the source of Aiiuid under pressure is disconnected from said drain line, operative connections between said valve operating means and said normally open bypass valve for 4closing the latter when said second valve is moved to connect said source of fluid -under pressure and said drain line to said iirst cylinder and lpiston mechanism as aforesaid in the desired one of said opposite directions, a valve mechanism for said second cylinder and piston mechanism including Va control valve and means for normally maintaining the latter in a position to connect said second cylinder and piston mechanism with said source of uid under pressure to effect the holding of said element in a fixed position when rthe source of fluid is vdisconnected from said drain the other with the source of iiuid under pressure and said vopera-tive connections between vsaid valve operating means and said by-pass valve actuated by said valve operating means :at a point ahead of the 'operative connection of said valve operating means With'said control valve mechanism. Y

4. In combina-tion, in a 4contmlling apparatus for a system including an element to be moved to diierent positions and to be held in such p0- sitions, cylinder and piston mechanism for changing the position of said element in opposite directions, means for holding said element in diierent positionsto which it is moved includingV another cylinder and piston mechanismfa source ofV fluid under pressure, and a drain line,

7normally open bypassY means, including a normally open bypassv valve, for connecting the source of iiuid under pressure with the drain line, a control valve mechanism forsaidviirst cylinder :and piston mechanism including 'a valve structurally distinct from and movable bodily relative to said bypass valve and having operating means and movable by its operating means from a normal position selectively yin oppositedirections to connect said source of iiuid under pressure and said drain lineA to said iirst cylinder :and piston mechanism to cause such cylinder and piston mechanism to change the position of said element when the source of fluid under pressure is disconnected from said drain line, operative connections between said valve operating means and said normally open bypass valve for closing the latter when said second valve is moved to connect said source of fluid under pressure and said drain line to said first cylinder and piston mechanism as aforesaid 4in 1the .desired one of said opposite directions, a valve mechanism for said second cylinder and piston mechanism 4including a control valve and means for normally maintaining the latter in a position to connect said source of Ifluid under pressure with said second cylinder and piston mechanism to effect the holding of said element in a fixed position vwhen the source of iiuid is disconnected from said drain line, `and means operated by said operating means, when the latter is moved to actuate said second valve :in either direction from said normal position to supply fluid to the cylinder and piston mechanism which it controls, for moving said third mention-ed lvalve to disconnect said source of fluid under pressure from said second cylinder and piston mechanism and connect the latter to said drain line, each of said cylinder and` piston mechanisms having conduit means controlled by its respective valve mechanism for connecting it independently of the valve mechanism of the other with the source of fluid under pressure and said operative yconnections between said valve operating means and said by-pass valve actuated by said valve operating means at a point ahead of the operative connection of said valve operating means with said control valve mechanism.

5. In combination, an element supported for adjustment, hydraulic means for 'effecting adjustment thereof, hydraulically controlled means for holding said element in different adjusted positions, and a hydraulic system lfor controlling the Iadjustment and holding of said element by saidmeans including a pump for supplying a hydraulic duid, a reservoir from which said pump is connected to draw iiuid, a pump discharge line, a return line to said reservoir, :a valve controlled bypass connection between said lines having a 17 valve therein movable between positions respectively-opening and Vclosing said bypass connection, vmeans `for normally holding said valve in a posi-tion to open said bypass connection, a valve `for controlling said hydraulically controlled means for hold-ing said element in different adjusted positions movable to change the connections of said means with said lines and having means associated with it for normally holding it vin a posi-tion in which said holding means is operative by pump discharge line pressure to hold said `element when .the yfluid in said pump discharge line is under a pressure corresponding to the closed position of said bypass valve, avalve for controlling the -connection of said hydraulic adjustment effecting means with said lines, operating means for said valve, an element movablewith said valve as it is moved to effect connection of said adjustmentJ 4eifecting means with said pump disch-arge line, an actuating member movable by said lat-ter element, and -a secon-d member mo-v- |able by Asaid actu-ating member to eiect movement of said bypass valve to closed position and to change the posi-tion of said valve for controlling said hydrau-lically controlled holding means to cause the latter, by connection with said -return line, to Irelease said rst mentioned element.

6. In combination, an element supported f-oradjustment, hydraulic means for effecting .adjustment thereof, hydraulically vcontrolled means for holding said element in different adjusted pos-itions, :and a hydraulic system for controlling the adjustment and holding of said element by said means including a pump for supplying a hydraulic iiuid, a reservoir from which said pump is connected'to draw fluid, a pump -d-ischarge line, a return line vco-said reservoir, a valve controlled bypass vconnection between said lines having a valve therein movable between position-s respectively opening :and closing said bypass connection, means for normally holding said valve in a position to open sai-d bypass connection, Aa valve for controlling said hydraulically controlled means `for holding said element in -diilerent adjusted positions movable to change the connections of said means with said lines :and having means associ-'ated with it for normally hol-ding it in a position in which said holding means is operative by pump discharge line pressure to hold said element when the uid in sai-d pump discharge line is undera pressure corresponding to the closed position of said bypass valve, a valve for controlling the connection of said hydraulic adjustment effecting means with said lines, operating means for-said valve,l an element movable with said valve as it is moved to effect connection of said adjustment effecting means with said pump discharge line, a cam movable byl said latter element, and a leverV movable by said c-am to effect movement of said bypass valve to closed position and to' change the position of said valve for controlling said hydraulically 1controlled holding means ito cause the latter to release said rst mentioned element.

'7, In combination', an element supported for adjustment, hydraulic means for effecting adjustment thereof in opposite directions, hydraulcally controlled means for holding said element in different adjusted positions, and ahydraulic system` for controlling the adjustment and holding of said element by said means including a pump for supplying a hydraulic fluid, a reservoir from which saidy pump is connected to draw iluid,

a pump discharge line, a return line to said res-` 18 tween said lines havinga valve therein movable between positions respectively opening and closing said bypassv connection, means for normally holding said valve in a position to open said bypass connection, a valve for controlling said hydraulically controlled means for holding said element in diierent adjusted positions movable to change the connections of said means with said lines and having means associated with it for normally holding it in a yposition in which said holding means is operative yby pump discharge line pressure to hold said element when the fiuid in said pump discharge line is under a pressure corresponding t0 the closed position of said bypass valve, a valve for controlling the connection lci? said hydraulic adjustment effecting means with said lines, to effect opposite adjustments of said element, operating means for said last mentioned valve, an element movable with said Valve as itis moved to eiect connection of said adjustment effecting means withsaid pumpdischarge line, adouble-acting cam movableV by said latter element, and a lever pivoted between its ends and movable by said cam to effect movement, by one of its ends, of said bypass valve to closed position and, by the other of its ends, to change the position of said valve for controlling said hydraulically controlled holding means to cause the latter to release said rst mentioned element.

8. In a valve mechanism for controlling a hydraulically operated apparatus including a pressure uid motor operated swinging apparatus, a pressure iiuid operated locking apparatus operable on operating iiuid supplied thereto to effect locking, and a pump for supplying .operating iiuid for said motor and for said locking-apparatus, in combination, a normally open valve for ISlSVIlg Said pump of back pressure, means movable to effect closing of said valve, a valve for controlling said motor, a normally open valve for controlling said locking apparatus, means for moving said second mentioned valve to eiect swinging operation of said swinging apparatus, means movable to close said third mentioned valve to interrupt operating iiuid supply from said pump to said pressure fluid operated locking apparatus, and means moved by movement of said second mentioned valve moving means to effect swinging operation to effect actuation of said means movable to effect closing of said first mentioned valve and said means movable to close said third mentioned valve to eiTect 'closure of both of said ii'r'st and third mentioned valves.

9. In combination, in a controlling apparatus for a system including anelement to be moved to different positions and to be held in such positions and having another element supported thereon and movable into different positions with respect thereto, cylindergand piston mechanism for changing the position of said rst mentioned element, means for holding said iirst mentioned element in diierent positions to which it is moved including another cylinder and-piston mechanism, means for moving said second elementinto different positions relative to said first Ymentioned element and including a third cylinder and vpiston mechanism, a source of. iluid under pressure, and a drain line, normally open bypass means, including a normally open bypass valve, for connecting the source of fluid under pressure with the drain line, a control valve mechanism forsaid first. cylinder and piston mechanism including a valve structurally distinct from and movable 'iodily relative'lto said bypassvalve and A having operating means and movable by its operating means from a normal position to connect said source of fluid under pressure and said drain line to said rst cylinder and piston mechanism to' cause such cylinder and piston mechanism to change the position of said rst element when the source of fiuid under pressure is disconnected by said bypass valve from said drain line, operative connections between said valve operating means and said normally open bypass valve for closing the latter when said second valve is moved to connect said source of fiuid under pressure and said drain line to said first cylinder and piston mechanism as aforesaid, a valve mechanism for said second cylinder and piston mechanism for connecting it selectively with said source of fluid under pressure and said drain line, including a control valve distinct from said bypass valve and means for normally maintaining such control valve in a position to connect said second cylinder and piston mechanism to effect the holding of said first element in a fixed position, means operated by said operating means, when the latter is moved to actuate said second valve to supply fluid to the cylinder and piston mechanism which it controls, for moving said third mentioned valve to cause said second cylinder and piston mechanism to occupy a position in which it does not hold said first element against movement, a control valve mechanism for said third cylinder and piston mechanism including a fourth valve, distinct from each of the other three and having operating means by which it is movable from a normal position to eifect movement of said second element relative to said first element, said last mentioned operating means having operative connections with said bypass valve only, in addition to its operative connection with said fourth valve, for moving said bypass valve to closed position, when said fourth valve is moved to cause movement of said second element relative to the first element and 'While said third valve remains in its position to effect holding of said rst mentioned element in a xed position.

10. In combination, in a controlling apparatus for a system including an element to be moved to different positions and to be held in such positions and having another element supported thereon and movable into different positions with respect thereto, cylinder and piston mechanism for changing the position of said rst mentioned element, means for holding said first mentioned element in different positions to which it is moved including another cylinder and piston mechanism, means for moving said second element into different positions relative to said first mentioned element and including a third cylinder and piston mechanism, a source of fluid under pressure, and a drain line, normally open bypass means, including a normally open bypass valve, for connecting the source of iiuid under pressure with the drain line, a control valve mechanism for said first cylinder and piston mechanism including a valve structurally distinct from and movable bodily relative to said bypass valve and having operating means and movable by its operating means from a normal position to connect said source of fluid under pressure and said drain line to said first cylinder and piston mechanism to cause such cylinder and piston mechanism to change the position of said first element when the source of fluid under` pressure is disconnected iby said bypass valve from said drain line, operative connections between said valve operating means and said normally open bypass valve for closing the latter when said second valve is moved to connect said source of iuid under pressure and said drain line to said first cylinder and piston mechanism as aforesaid, a valve mechanism for said second cylinder and piston mechanism for connecting it selectively with said source of uid under pressure and said drain line, including a control valve distinct from said bypass valve and means for normally maintaining such control valve in a position to connect said second cylinder and piston mechanism to effect the holding of said first element in a fixed position, means operated by said operating means, when the latter is moved to actuate said second valve to supply fluid to the cylinder and piston mechanism which it controls, for moving said third mentioned valve to disconnect said source of fiuid under pressure from said second cylinder and piston mechanism and connect the latter to said drain line, a control valve mechanism for said third cylinder and piston mechanism including a fourth valve, distinct from each of the other three and having operating means by which it is movable from a normal position to eiect movement of said second element relative to said rst element, said last mentioned operating means having operative connections with said bypass valve only, in addition to its operative connection with said fourth valve, for moving said bypass valve to closed position, when said fourth valve is moved to cause movement of said second element relative to the rst element and While said third valve remains in its position to effect holding of said first mentioned element in a fixed position.

Y1l. In combination, in a controlling apparatus for a system including an element to be moved to different positions and to be held in such positions and having another element supported thereon and movable into different positions with respect thereto, cylinder and piston mechanism for changing the position of said first mentioned element, means for holding said first mentioned element in different positions to which it is moved including another cylinder and piston mechanism, means for moving said second element into different positions relative to said rst mentioned element and including a third cylinder and piston mechanism, a source of fluid under pressure, and a drain line, normally open bypass means, including a normally open bypass valve, for connecting the source of fiuid under pressure with the drain line, a control valve mechanism for said iirst cylinder and piston mechanism including a valve structurally distinct from and movable bodily relative to said bypass valve and having operating means and movable by its operating means from a normal position selectively in opposite directions to connect said source of fluid under pressure and said drain line to said first cylinder and piston mechanism to cause such cylinder and piston mechanism to change the position of said first element when the source of fluid under pressure is disconnected by said bypass valve from said drain line, operative connections between said valve operating means and said normally open bypass valve for closing the latter when said second valve is moved to connect said source of iiuid under pressure and said drain lineto said first cylinder and piston mechanism as aforesaid, a valve mechanism for said second cylinder and piston mechanism for connecting it selectively with said source of fluid under pressure and said drain line, including a control valve distinct from said bypass valve and means for normally maintaining such control valve in a position to connect said second cylinder and piston mechanism to eifect the holding of said nrst element in a fixed position, means operated by said operating means, when the latter i is moved to actuate said second valve in either direction from said normal position to supply Huid to the cylinder and piston mechanism which it controls, for moving said third mentioned valve to cause said second cylinder and piston mechanism to occupy a positionin which it does not hold said first element against movement, a control valve mechanism for said third cylinder and piston mechanism including a fourth valve, distinct from each of the other three and having operating means iby which it is movable from a normal position to effect movement of said second element relative to said first element, said last mentioned operating means having operative connections with said bypass valve only, in addition to its operative connection With said fourth valve, for moving said bypass valve to closed position, when said fourth valve is moved to cause movement of said second element relative to the first element and while said third valve remains in its position to effect holding of said iirst mentioned element in a fixed position.

l2. In combination, in a controlling apparatus for a system including an element to be moved to different positions and to be held iirsuch positions and having another element supported thereon and movable into different positions with respect thereto, cylinder and piston mechanism for changing the position of said rst mentioned element, means for holding said nrst mentioned element in different positions to which it is moved including another cylinder and piston mechanism, means for moving said second element into diiferent positions relative to said first mentioned element and including a third cylinder and piston mechanism, a source of fluid under pressure, and a drain line, normally open bypass means, including a normally open bypass valve, for connecting the source of fluid under pressure with the drain line, a control valve mechanism for said Afirst cylinder and piston mechanism including a valve structurally distinct from and movable bodily relative to said bypass valve and having operating means and movableby its operating means from a normal position selectively in opposite directions to connect said source of duid under pressure and said drain line to said rst cylinder and piston mechanism to cause such cylinder and piston mechanism to change the position of said first element when the source of fluid under pressure is disconnected by said bypass valve from said drain line, operative connections between said valve operating means and said normally open bypass valve for closing the latter when said lsecond valve is moved to connect said source of fluid under pressure and said drain line to said first cylinder and piston mechanisin as aforesaid, a valve mechanism for said second cylinder and piston mechanism for connecting it selectively With said source of fluid under pressure and said drain line, including'a control valve distinct from said bypass valve and means for normally maintaining such control valve in a position to connect said second cylinderv and piston mechanism to effect the holding of said first element in a fixed position, means operated by said operating means, when the latter is moved to actuate said second valve in either direction from said normal position to supply fluid to the cylinder and piston'mechanism which it controla for moving said third mentioned valveto disconnect said source of fluid under pressure from said second cylinder and piston mechanism and connect the latter to said drain line, a control valve mechanism for said third cylinder and piston mechanism including a fourth valve, distinct from -each of the other three and having operating means by which it is movable from a normal position to effect movement of said second element relative to said iirst element, said last mentioned operating means having operative connections with said bypass valve only; in addition to its operative connection with said fourth valve, for moving said bypass valve to closed position, when said fourth valve is moved to cause movement of said second element relative to the first element and While said third valve remains in its position to effect holding of said first mentioned element in a fixed position.

13. In combination, an element supported for adjustment, a plurality of hydraulic means for effecting different adjustments thereof, hydraulically controlled means for maintaining adjustments effected by one of said plurality of hydraulic means, and a hydraulic system for controlling the effecting and maintaining of adjustments as aforesaid including a pump for supplying a hydraulic fluid, a reservoir from Which said pump is connected to draw fluid, a pump discharge line, a return line to Asaid reservoir, a valve controlled bypass connection between said lines having a valve therein movable between positions respectively opening and closing said bypass connection, .means for normally holding said valve in a position to open said bypass connection, a valve for controlling said hydraulically controlled means for maintaining adjustment movable to change the connections of said means With said lines and having means kassociated With it for normally holding it in a position in which said adjustment maintaining means is operative to maintain adjustment When the fluid in said pump discharge line is under a pressure corresponding to the closed position of said bypass valve, a valve for controlling the connection of one of said plurality of hydraulic adjustment effecting means with said lines, operating means for said valve, an element movable with said valve as it is moved to effect connection of said adjustment effecting means with said pump discharge line, an actuatingV member movable by said latter element andya second member movable by said actuating member to effect movement of said bypass valve to` closed position and to change the position of said valve for controlling said hydraulically controlled adjustment maintaining means so that the latter will. not maintain adjustment of said element, and a valve yfor controllingthe connection of another one of said plurality of hydraulic adjustment effecting means with said lines, operating means for 'said last mentioned valve, an element mov- 23 ments effected by one of said plurality of hydraulic means, and a hydraulic system for controlling the effecting and maintaining of adjustments as aforesaid including a pump for supplying a hydraulic duid, a reservoir from which said pump is connected to draw fluid, a pump discharge line, a return line to said reservoir, a valve controlled bypass connection between said lines having a valve therein movable between positions respectively opening and closing said bypass connection, means for normally holding said valve in a position to open said bypass connection, a valve for controlling said hydraulically controlled means for maintaining adjustment movable to change the connections of said means with said lines and having means associated with it for normally holding it in a position in which said adjustment maintaining means is operative to maintain adjustment when the fluid in said pump discharge line is under a pressure corresponding to the closed position of said bypass valve, a valve for controlling the connection of one of said plurality of hydraulic adjustment effecting means with said lines, operating means for said valve, an element movable with said valve as it is moved to effect connection of said adjustment effecting means with said pump discharge line, a cam movable .by said latter element and a lever movableby said cam to effect movement of said bypass valve to closed position and to change the position of said valve for controlling said hydraulically controlled adjustment maintaining means so that the latter will notmaintain adjustment of said element, and a valve for controlling the connection of another one of said plurality of hydraulic adjustment effecting means with said lines, operating means for said last mentioned valve, an element movable with said last mentioned valve as it is moved to effect connection of said last mentioned adjustment effecting means with said pump discharge line, an actuating member movable by said last mentioned element and a second member movable by said last mentioned actuating member to effect movement of said bypass valve to closed position.

l5. In combination, an element supported for adjustment, a plurality of hydraulic means for effecting different adjustments thereof, hydraulically controlled means for maintaining adjustments effected by one of said plurality of hydraulic means, and a hydraulic system for controlling the eiecting and maintaining of adjustments as aforesaid including a pump for supplying a hydraulic fluid, a reservoir from which said pump is connected to draw fluid, a pump discharge line, a return line to said reservoir, a valve controlled bypass connection between said lines having a valve therein movable between positions respectively opening and closing said bypass connection, means for normally holding said valve in a position to open said bypass connection, a valve for controlling said hydraulically controlled means for maintaining adjustment movable to change the connections of said means with said lines and having means associated with it for normally holding it in a position in which said adjustment maintaining means is operative to maintain adjustment when the fluid in said pump discharge line is under a pressure corresponding to the closed position of said bypass valve, a valve for controlling the connection of one of said plurality of hydraulic adjustment effecting means with said lines to eiect opposite adjustments of said element, operating means for said valve, an element movable with said valve as it is moved to effect connection of said adjustment effecting means with said pump discharge line, a doubleacting cam movable by said latter element and a lever pivoted between its ends and movable by said cam to effect movement, by one of its ends, of said bypass valve to closed position and, by the other of its ends, to change the position of said valve for controlling said hydraulically controlled adjustment maintaining means so that the latter Will not maintain adjustment of said element, and a valve for controlling the connection of another one of said plurality of hydraulic adjustment effecting means with said lines, operating means for said last mentioned valve, an element movable With said last mentioned valve as it is moved to effect connection of said last mentioned adjustment effecting means with said pump discharge line, an actuating member movable by said last mentioned element and a second member movable by said last mentioned actuating member to effect movement of said bypass valve to closed position.

16. In combination, in a controlling mechanism for a system including a pressure fluid motor operated swinging apparatus, a pressure iiuid operated locking apparatus, a pressure fluid motor moving apparatus, and a pump for supplying operating fluid for said motors and for said locking apparatus, a normally open valve for relieving said pump of back pressure, means movable to eiect closing of said valve, a valve for controlling said first motor, a normally open valve for controlling said locking apparatus, means for moving said second mentioned valve to elect swinging operation of Said swinging apparatus, means movable to close said third mentioned valve, means moved by movement of said second mentioned valve moving means to effect swinging operation to effect actuation of said means movable to effect closing of said rst mentioned valve and said means movable to close said third mentioned valve to effect closure of said first and third mentioned valves, a valve for controlling said second motor, means for moving said last mentioned valve to effect operation of said second motor to effect movement, and means moved by movement of said last mentioned valve moving means to effect movement by said second mentioned motor to effect closing of said rst mentioned valve.

17. In combination, in an operating and controlling system for an apparatus including an element to be moved into different positions, hydraulic cylinder and piston means for moving it from one position to another, means for releasably holding it in its different positions including another hydraulic cylinder and piston means, and another element mounted on said first element and having hydraulic cylinder and piston means for moving it relative to said rst element, a pump, a reservoir for hydraulic fluid, said pump connected to draw hydraulic fluid from said reservoir and having a discharge line, a line for returning fluid to said reservoir, means normally preventing the building up of pressure in said pump discharge line including a normally open bypass valve, a control valve movable to control the connection of said rst hydraulic cylinder and piston means with said lines, another control valve movable to control the connection of said second hydraulic cylinder and piston means with said lines, still another control valve movable to control the connection of said third hydraulic cylinder and piston means with said lines, operating means for said first control valve for moving it to effect a connection between said first hydraulic cylinder and piston means and said pump discharge line and said return line, means operated by said operating means for moving said second control valve from a normal position to a position in which it precludes holding of said first element stationary by said releasable holding means and for moving said bypass valve to closed position, operating means for said third control valve for moving it to effect a connection between said third hydraulic cylinder and piston means and said pump discharge line for effecting movement of said second element relative to the rst, and means operated by said last mentioned operating means for closing said bypass valve while leaving said second mentioned control valve in its normal position.

18. In combination, in an operating and controlling system for an apparatus including an element to be moved into diierent positions, hydraulic cylinder and piston means for moving it from one position to another, means for releasably holding it in its diierent positions including another hydraulic cylinder and piston means, and another element mounted on said iirst element and having a plurality of hydraulic cylinder and piston means for moving it differently relative to said rst element, a pump, a reservoir for hydraulic fluid, said pump connected to draw hydraulic fluid from said reservoir and having a discharge line, a line for returning iiuid to said reservoir, means normally preventing the building up of pressure in said pump discharge line including a normally open bypass valve, a control valve movable to control the connection of said nrst hydraulic cylinder and piston means with said lines, another control valve movable to control the connection of said second hydraulic cylinder and piston means with said lines, still other control valves movable to control the connection of said plurality of hydraulic cylinder and piston means individually with said lines, operating means for said rst control valve for moving it to effect a connection between said iirst hydraulic cylinder and piston mechanism and said pump discharge line and said return line, means operated by said operating means for moving said second control valve from a normal position Yto a position in which it precludes holding of said nrst element stationary by said releasable holding means and for moving said bypass valve to closed position, individual operating means for each of said still other control valves for moving them to effect a connection between the ones of said plurality of hydraulic cylinder and piston means which they respectively control and said lines for effecting movement vof said second element relative to the first, and means operated by each of said last mentioned operating means for closing said bypass valve while leaving said second mentioned control valve in its normal position.

HAROLD SILVER. CLARENCE R. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATESk PATENTS Number Name Date 710,959 Engelhard Oct. 14, 1902 986,392 .John Mar. 7, 1911 1,129,741 Shannon Feb. 23, 1915 1,683,175 Falcke Sept. 4, 1928 1,968,422 Proctor yJuly 31, 1934 2,203,938 Barrett June 11, 1940 2,203,939 Barrett June 11, 1940 2,211,692 Ferris Aug, 13, 1940 2,221,150 Rebeski Nov. 12, 1940 2,243,364 Trautman May 27, 1941 2,319,551 Linden May 18, 1943 2,331,790 Nichols Oct. 12, 1943 2,372,311 Brown Mar. 27, 1945 2,431,944 Lauch et al. Dec 2, 1947 2,438,389 Edge Mar. 23, 1948 Number Country lDate Great Britain July 24, isis

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