US 2345224 A
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Description (OCR text may contain errors)
March 28,1944. G. w. UPP 2,345,224
CONTROL .SYSTEM Filed May 6, 1941 4 Sheets-Sheet l 5w NGaPRoPELCROwDgETRACT STEERING-D F IVG I v I JAw cLuTcHEs l I, HO'STE sw'lNe'aPnoPEL-A s ,a lucmr w I f CLIIHIN'` I l il v .o t ii! I I -Aoe' G i BooM HolsT-r-z I, 4 44:, "g1 vj swma i 1:.- l I] N pmx: I
`o ROPEL BRAKE-l INVENT OR. GEORGE w. u PE March 28, 1944. G. w. UPP 2,345,224 v CONTROL SYSTEM v Filed May 6, 1941 4 Sheets-Sheet 2 INVE OR. GEORE w.uPP.
March 28,1944.4 G. w. UPP
' CONTROL SYSTEM Filed May e, 1941 4 Asheets-sheet e FIG.\5
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DIPPER T lP-J March 28, l1944. G. w. UPP
CONTROL SYSTEM 4 Sheets-Sheet 4 Filed May 6, 1941 INVENTOR GEORGE VV-UPF'.`
Patented Mar. 28, 1944 CONTROL SYSTEM George W. UDP, Lakewood, Ohio, assgnor to The Midland Steel Products Company, Cleveland,l Ohio, a corporation of Ohio Application May s, 1941, serial No. 392,085
This invention relates to new and usefulimprovements in control stations and more particularly to the type disclosed in my copending application Serial No. 353,495, led August 21, 1940. vThis control station contemplates a structure in which a plurality of control valves can be conveniently mounted as a unit in the smallest possible space in the'cab of the shovel, digger or the like.
An important object of the invention is to provide an arrangement whereby a single lever can control three separate operations; two of them simultaneously.
A further object of the invention is to provide in such an arrangement, means whereby at any point in the movement of the control .handle for operating one or more valves, this handle can be moved to operate another valve without affecting the position of the rst mentioned valves.
Another object of the invention is to provide simple Iand eflicient cam means for opening or in closing a valve and for releasably retaining y such valve either in open or closed position.
Other objects and advantages of the invention will become apparent during the course of the following` description,
In the accompanying drawings forming a part of the description |and wherein like numerals are employed to designate like parts throughout the several views,
Fig. 1 is a perspective view of the valve control stand shown in my copending application Serial No. 353,495, upon which the present invention is an improvement.
Fig.2 is a top plan of the same,
Fig. 3 is an enlarged vertical transverse section of the upper portion of the standtaken on the line.3-3 of Fig. 2,
Fig. 4 is an enlarged fragmentary section taken on the line 4 4 of Fig. 3,
Fig. 5 is an enlarged longitudinal section of av non-compensating type of poppet valve employed in the invention,
Fig. 6 is an enlarged fragmentary section of.
this valve taken on the lineB-E of Fig. 5,
Fig. '7 is a front elevation of a pair of such valves arranged as a unit with cam actuation,
Fig. 8 is a top elevation of the same with onehalf of the structure shown in section taken along the line 8-8 of Fig. "l,
Fig. 9 is a side elevation of the forward tion of the valve showing a side elevation of the cam actuator.
yings for a-det'ailed' description of theinventio'n," which is designed for the easier, more positive and quickerV operation of the usual power op` erated shovel controls by means of a pressure medium, the numeral '9 designates aunitary'vcontrol station in its entirety. This station com# prises a stand I0 which is built separate and independent of the power'operated shovel and its controls, and is installed as a unit in the limited space in the shovel cab to be connected to the various shovel controls by flexible hose connec'- tions to air operated actuators of 'the usual construction. These actuators, not shown, are operated by a pressure medium under the control cf operating levers A for the swing and propel mechanism; B for the jaw clutches of the swing land propel mechanism; Cfor the crovvdand retract mechanism; D for the steering mechanism; .1 E for the hoist mechanism; F forthe boom hoist mechanism; G for the vengine clutch; I-I for the swing brake mechanismand v*for the propel brake mechanism. These various mechanisms are standard on power shovels and are well under- L stood by those skilled in the art. All ve levers A to E inclusive, extend vertically throughand operate longitudinally in individualslotsll eX- tending transversely across the top of the unitary stand. Each valve handle A to with the exception of handleE for thehoistmechanism, is adapted to alternately operate apa'ir of spring returnedl pressure controlvalves I3 and lllof the compensating type shown in thefaforesaidfcopending application Iand ,each' with a return spring I4',V as indicated inFig. 3,'Ialthoughin instanceswhere desired, thesetvvo valves or one of them may be of thencn-compensating type such as` is shown in Figs.' 5` to 9 herein. When any of these've ,handles are moved from their nor-v mal neutral positions held bythe opposed springs of the two valves I3` and I4, these valves are alternately opened fand closed, that is to say, when the operating handle is moved forwardly of the stand through its respective slot I I, thevalve I4 is opened to permit passage of pressure, and when moved toward the' rear end of its,r respective slot f II, Ithe upper valve I3 is opened for thel passage of pressure while the valve I4 returns to a closed position to cut oii pressure therethrough.
In order tolock any of the operating` handles. land one valve of any pair in applied position, any of the slots. I I in which this operation is desired,
may be covered by appropriately slotted interchangeable plates I3.
i I For illustrationpurposes I such a plate is shown as having alongitudinally i Referring now more particularly to the drawextending slot I4 throughA Whih PlOeCts and.
operates the shank I of the operating handle for alternately opening and closing the two valves I3 and I4. The two ends of this longitudinal slot I4 are provided with lateral ways I8 extending entirely across the slot II in the top I2 of the stand and terminate in angular longitudinally extending ways I'I parallel with the slot I4 so that the operating handle can be moved through the slot I4 to operate either valve I3 and I4 and while s0 operated, this handle can be moved laterally through the way I6 to operate a third valve and down into the terminus I I to be locked in saidV'operating position until subsequently releasedby I the operator. omitted whereby the operatinglever can be moved sidewise to control an auxiliary adjunct irrespective of the position of the operating lever, or other.
forms of a plate I3 shown in Fig. 2 (some with 1f desired any npiste laf can be only an intermediate notch I3D with the ends of the plate spaced inwardly of the ends of slot VI I, or as I 3E with onlygone end lateral way) may be used wherecertain operations are desired, on any of theslotsII.
In order for any of theY operating levers to bem capable .of bothlongitudinal and lateral swinging movement, it is made of an upper section having a lower forked end I8 which straddles and is pivoted to the upper end of the lower lever section I9 by means of a pivot pin 28, permitting the upper section of the lever to swing on this pivot laterally through the ways I6 of the slot. To normally urge the upper portion of this lever toward the right hand edge of the slot I4, a looped coil spring 2I has its intermediate portion 22 env gaging the lower section I9at one side of the pivot 28 with its two ends coiled about the pivot 28 and bentlaterally toengage a corresponding side of the upper vforkedsection I8, so that when the upper section of thelever ismoved into either of the ways I6, the ends of this spring will be moved to the left of Fig. 4 to force the intermediate portion 22 ilrmly againstthe side 'of the lower section I9 to stress the spring, so that when pressure on the upper portion vof the lever is released, this spring will return it to normal position into axial alignment with thelower section I9. y
This lower section I9 of the leveris fulcrumed at 23 between the .ears of a post 24 secured to a supporting bracket.4 25 fastened to the downturned flange of. the .top I2 and to a transverse bar 28 .connected with the legs of the stand as disclosed in my co-pending application. The end of thelever section I9 below the fulcrum 23 is angularly'disposedat 21 and is pivotallyconnected as at 32 to a valve stem 28 of the lower valve'r I4. The valve stem. 29 of the upper valve I3 ispivotf. ally connectedas at .38 above the fulcrum 23 the same'd'istance therefrom as the pivot 32.' for the valve stem 28. Thus,` by moving the handle C lengthwise ofthe slot I4 in either direction, and inthe plane of the pivot. 28, the valves I3 and I4 can be alternately opened and closed. l 1
In order that the dipper trip of the power shovel may be operated by the operating lever C, simultaneously with the crowd or retract movement of the shovel boom, a dipper trip valveI J is mounted f C at any point in its travel about its fulcrum 23, a
valve operating plate 36 is made co-extensivewith the length of the slot II in the stand top I2 and is mounted by a yielding mounting in inclined relationship to the lever C,'so that the upper end of the plate 38 is at all times in engagement with the upper laterally movable portion I 8 of the operating handle C in all positions of the latter, to be operated thereby. Adjacent its lower end, the plate 36 is provided with a pair of somewhat semispherical or counter-sunk openings 31 at opposite side edges thereof to receive the conical or semispherical heads 38 of a pair of studs 39 secured to the lower portions of bracket 35 by means of the nuts 48. A compression coil spring 4I is placed upon each stud 39 between the bracket 35 and the valve operating plate so that the lower portion of thisspring presses more iirmly uponthe valve plate 36 than its upper portion to hold the valve plate firmly in contact with the semi-spherical heads 38 and thereby form somewhat of a pivotal floating mounting for the plate.
.The dipper trip valve J is provided with a longitudinally slidable vplunger sleeve 42 terminating at its'vouter end in an enlarged head 43 which is normally forced outwardly against a stop ringx44 by a conicalcompression spring 45 to hold a ball 46 peened intothe enlarged head 43, into engagement with the central portion of the vvalve operating plate 38 'adjacent its upper edge. t This normal exhaust position of the valve sleeve 42 will normally press the upper end of the valve plate 36 into engagement withv the shank of the upper section of the operating lever C, so that when the latter'is moved laterally into either way I6, the valve. plate36 Awill move the valve plunger sleeve v42 inwardly to permitpressure to pass through videdwith a lateral exhaust port 52 communicating with` the bore and the interior of the sleeve 42 throughthe openingsv 53 in the latter whenever the sleeve is at the limit of its movement as shown in Fig. 5, to exhaust the valve, The inner end of the valve section is provided with a recess for the Vreception of a suitable air tight packing 54 Athrough which the valve sleeve 42 reciprocates.
Ihe other valve section 49 is provided with a central pressure chamber 55 supplied withpressure through a Suitable lateral pipe 56, Awhich in'some installations may bethreaded in a c entral tapped opening in a closure cap 5l. Extending co-axially within the chamber 55'is an annular valve seat 58 larger lin diameter than the Op. of the valve sleeve 42, and this s eat at'one side thereof-and opposite the intake .pipe 56, is provided with a port 59 into which is,v threaded a pipe 68which leadsto the actuator for Vthe dipper trip. A iloating inlet valve BI is normally forcedjupon its, seat 58 by means ofthe coil spring 62 so asto'cut oif the source of pressure frornV` the port59. ,In such position, and with the valve sleeve 42 disengaged from the inlet 'valve 6I, the port 59 can exhaust through lthe valve sleeve, its ports 53 and escape into the'exhaust port 52 to vent the.'` mechanism operated by this .valve When theoperating lever Cis moved longitudif nally in the slot I4A one way orV theotherto crowd orretract the shovel by the operation of the valves I3 and I4, and the .upper section I8 of.. the operating handle C is moved laterally into eitherend I6 of. theslot, the valve actuating plater 36 is caused to move toward its valve and move the kvalve sleeve 42 into engagement with the inlet valve 6I and thereafter lift this valve from its seat so that pressure existing in chamber 55 may pass into the concentric seat 58 and thence to the port 58 to operate the dipper trip. It will be understood that in this position of the valve sleeve 42, its exhaust ports 53 will be closed by the bore of the valve section 50 thereby preventing escape of the pressure medium until the valve plate 36 is released byoperating lever C. To retain the upper section I8 of the operating lever C in position to hold the inlet valve 6I open, this section of thefoperating lever is moved into the notched end I'I of the slot and will be held against one side thereof due to the pressure exerted on valve plate 36 by the valve spring 45. As soon as the operating lever C is moved into the lateral passage I6, the combined action of the valve spring 45 and the lever spring 2| will automatically throw the upper end of the control lever into the longitudinal slot I4 in which position it will be automatically moved back to its normal central position due to the opposed relation of the valves I3 and I4 acting on this lever when the operator releases it to the automatic operation of the mechanism. Due to the fact that the valve operating plate 36 is coextensive with the slot for the upper end of the operating lever, the latter may be moved to operate the dipper trip valve J regardless of the operating position of the control lever. With the inlet valve 6I seated and the end of the valve sleeve 42 touching the rubber gasket of this valve, it will be seen that the valve can be held in a lapped position.
While the trip valve operated by lateral movement of the operating lever is illustrated in connection with the particular crowd and retract lever C, it will be understood that it is within the purview of the invention to associate this valve with any of the levers A to F inclusive, or any lever assigned to control two or more operations simultaneously. In case it is desired not to employ compensating type valves I3 and I4, these may be replaced with the dual valve shown in Figs. '7 to 9 inclusive wherein a plain poppet type valve such as shown in Fig. may be employed and the lower section of the operating lever C may be replaced with a cam operator with the upper section of the operating rod jointed or provided with a iulcrum like to enable the upper end of the operating rod to move laterally, as the poppet valves are being manipulated through the main operating movenient of the lever. Parts of this poppet valve which correspond to those shown in Fig. 5 are marked with correspondingv reference numerals so as not to duplicate the description. Both of the valve bodies are mounted upon a bracket 35 and are supplied with a pressure medium through a common inlet manifold 1I) terminating at opposite ends in end caps 'II so that the inlets into these valves are through the ends thereof rather than through the sides as shown in Fig. 6.
For alternately opening and closing the two valves, a cam segment i2 is pivotally mounted upon a stud 'i3 secured to the bracket 35 between the two valve casings. Above this pivot the cam is provided with a vertical boss 14 into which is threaded the lower end of a shank 'I5 of the operating lever C. As stated above, the upper end of this lever may be provided with a hinge joint 2Q such as shown in the preceding modification for the operation of a third valve.
In order to releasably retain the operating lever C in a neutral perpendicular position between the two valve casings, the upper edge of the cam is provided with a lpair of openings 'l for the seating of the balls 4S inv the valve sleeves 42. With thevvalve and cam assembledg' both valve plungers 42 are depressed aboutgOlE of an inch, and the balls in the plunger assemblies enter the small holes 'IB in the cam by approximately .0150i an inch, thereby acting as detent balls to hold. the lever in the neutral position and also to prevent any rattles. When the operating lever moves to either extreme as shown by the dot and dash lines in 7, the plunger sleeve valve oi one valve is moved inwardly by the cam about 3% of an inch thereby admitting tank pressure to the cylinder `connected to'fthat valve. At the same time, the cam moves entirely away from the other valve, leaving it in the released position. A second pair of small holes "i1 is provided n vthe cam below the first pair, so that either one or the other'plunger balls will also act as a detentA when either valve is in applied position. Normally, the valve is mounted on the bracket with the handle lever or shank 'I5 extending through a slot which limits the cam rotation, but as an added safety measure, a pair of lugs 'I8 are provided at the lower portion of the cam segment which will alternately abut the valve housing as the lever is swung from one side to the other of its neutral position to also limit cam rotation when either of the valves is moved to applied position.
It is to be understood that various changes in the size, shape and relation of parts may be resorted to without departing from the spirit of the invention or the scope of the appended claims.
1. The combination with a pair of movable elements; of an operating lever having its body fulcrumed at one end to operate one of said movable elements, said lever having its upper end movable independently of said body on an axis normal to the fulcrum axis and movable laterally of the normal plane of movement of said lever body to operate said other element, and an inclined operating plate for said second element co-extensive with the movement of said lever body, studs extending from the second element and having heads operating in openings in said plate, and coil springs on the studs between said plate and said second element.
2, The combination with a pair of spring pressed movable elements, and a third spring pressed element; of a single lever for operating all three movable elements and having its body iulcrumed and connected with said pair of elements to operate the same, the springs of said elements serving to retain said lever body in a neutral position, said lever having its upper end movable independently of the lever body ron an axis normal to the iulcrum axis and movable laterally of the normal plane of movement of said lever body to operate said third element.
3. The combination with a pair of spring pressed movable elements and a third spring pressed element; of a single lever for operating all three movable elements and having its body ulcrumed and connected with said pair of elements to operate the same, the springs of said elements serving to retain said lever body in a neutral position, said lever having its upper end movable independently of the lever body on an axis normal to the fulcrum axis and movable laterally of the normal plane of movement of said lever body to operate said third element,v
and an operating plate for said third element coextensive with the movement of said lever body so as to be operated by the upper pivoted end of said lever in any position of said lever body.
' 4. The combination with a support having a slot, of a pair of spring pressed elements mounted below said slot in vertical alignment, an operating lever extending through said slot and having its lower end fulcrumed and pivotally connected to said elements on opposite sides of said fulcrum to maintain said lever in a neutral position, a third spring Vpressed element mounted below said slot to one side thereof, and the upper end of said lever engaging said third element to be normally urged thereby against one side of said slot and said upper end of the lever being movable transversely of said slot against the tension of said third spring pressed element in any angular position of said lever.
5. The combination with a support having a slot, a, pair of movable elements mounted below said support below said slot and having a pair of studs extending from the bracket and terminating in semi-spherical heads, an operating plate for operating said other movable element and being mounted on said semi-spherical heads, a compression spring mounted upon each stud between its bracket and said operating plate, and an operating handle operating in said slot and connected to said operating lever on an axis normal to the axis of the fulcrum of the operating lever whereby when the operating handle is movedv laterally of said slot theoperating plate is moved to operate one of said movable elements when the operating lever is swung upon its fulcrum.
GEORGE W. UPP.