US2491371A

US2491371A - Hydraulic control panel

Info

Publication number: US2491371A
Application number: US636324A
Authority: US
Inventors: Duncan B Gardiner; Bernard L Readman
Original assignee: Vickers Inc
Current assignee: Vickers Inc
Priority date: 1945-12-21
Filing date: 1945-12-21
Publication date: 1949-12-13
Anticipated expiration: 1966-12-13

Description

HYDRAULIC CONTROL PANEL Filed Dec. 2i. 1945 5 Sheets-Sheet l 5. 7 r` l w BO ,E Lb 9, /l/Vv 1% u f 2 m m .Ml/r w Myw/ M ,///e, .m I

. u 7, u v D` I 7% /7 L w wm IN VEN TORS [7L/NDW B. 5mm/ww ma' 55m/H527 L- Reim/HN Dec. i3, w49 D. B. GARDINER Erm. 2949393731 HYDRAULIC CONTROL PANEL Filed Dec. 2'1, 1945 5 Sheets-Sheet 2 f6 Sovf T i .1Q g 'f i IN V EN TORS .FuNc/wv 5. 5H/Fawn ma Esa/Wmv L, FEHDMHN -Dec. 13, 1949 D. B. csARDlN-ER Erm. 2,491,371

HYDRAULIC CONTROL PANEL y Filed Dec. 21, 1945 5 Sheets-Sheet 3 HA/DEfRA/Hna L. @www /77' ran/wr D. GARDIINER ETAL. 294919373 HYDRAULIC coNTRorJl PANEL 1945 5 Sheets-Sheet 4 Filed Deo. 21

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INVENTURS EUA/WN B.. fw/@ ma? ,B5/wana l, @Hum/V RAPID RETURN FEED FORWARD ZAQLS'E Dec. 13, 1949 D. B. GARDINER Erm.

HYDRAULIC CONTROL PANEL 5 Sheets-Sheet 5 Filed Dec. 21, 1945 D .l I um j] CLOSED STOP DIFF.

RAPID ADVANCE E C M V D A CENTER INVENTORS .Uu/mmf E. gnam/v5@ HNUBMNHRU L- Hann/ww 5f i /77 Tan/ver Patented Dec. 13, 1949 HYDRAULIC CONTROL PANEL Duncan B. Gardiner, and Bernard L. Readman,

Detroit, Mich., assilnors to Vickers Incorporated, Detroit, Mieli., a corporation of Michlgan Application December 21, 1945, Serial No. 636,324

s claims'. l

This invention relates to power transmissions, particularly to those of the type comprising two or more fluid pressure energy translating devices, one of which may function as a pump and another as a fluid motor.

The invention more particularly relates to hydraulic transmission systems for driving machine tools incorporating a iluid pump, reversible iluid motor and a control panel containing the necessary valving for producing rapid advance, feed and rapid return movements of the motor and also for stopping the same.

In the art of hydraulic transmission systems of this type, the use of a panel incorporating the necessary valving to control the movement of the motor has become quite common. However, it has been the practice to use entirely different panels containing entirely different porting.-Das sages and valving to -meet the requirements -of various types of installations. Thus, a panel-incorporating an open-center type control valve, although suitable for some installations, would be entirely inadequate for systems demanding the use of a closed-center type of control valve or the use of a differential type control valve. For instance, whereas a panel incorporating an opencenter type control valve would be adaptable for use in a hydraulic transmission containing a constant delivery pump and reversible uid motor for driving a single load device, if another fluid motor was added to the transmission to drive an additional load device during periods of inactivity -of the first load device, an entirely ldifferent panel incorporating a closed-center control valve would have to be substituted for the rst panel.

It is therefore an object of this invention to provide a panel which may be used to nt a variety of installation requirements siniply by substituting a control valve of one type for a control valve of another type all of which are mountable within the same valve bore of the panel without any other changes being made to the panel.

In particular, it is an object of this invention 2 ferently designed control valves may be shiited in identically the same manner within said'bore for controlling the ports and passages toy produce the aforementioned movements of the motor, one co'ntrol valve being of the open-center type for unloading the pump to stop the motor. another being of the closed-center type for blocking the flow of pressure fluid at the control valve to stop the motor and the other being of the differential type to produce a differential rapid advance movement of the motor.

It is another object of this invention to provid a control panel for a hydraulic transmission sys tem and vfor the purposes such as stated above which will be light in weight, compact and which willgive long life and be easily convertible to suit the needs of different installations.

It is still another object to provide a panel for a system and for the purposes as above stated containing a longitudinal bore in which may be identically mounted any one of three control valves of different types shiftable completely within said bore, with identical means for shift ing said control valves manually or mechanically from the front or the rear of said panel, by -pres,- sure lluid applied at either end of said control valve, by solenoid means, or by a combination of any of the above means.

Further objects and advantages of the present invention will be apparent from the followingl description, ref erence being had tothe accompanying drawings wherein a preferred form of the present invention is clearly shown.

In the drawings:

. Figure 1 is a cross-sectional view'of a -panel embodying one form of the present invention taken on line I-l of Figure 4.

Figure 2 is a plan View of the panel.

Figure 3 is a front elevation of the panel.

Figure 4 is a bottom view of the panel.

Figure 5 is a rear elevation of the panel.

Figure 6 is a 'cross-sectional view taken on line 6--6 of Figure 3. j

Figure 7 is a diagrammatic view of a hydraulic circuit incorporating the panel of Figures Il through 6 and showing a portion thereof in one of its dillerent positions.

Figure 8 is a view corresponding to Figure 7 but illustrating the parts in a different position.

Figure 9 is a view corresponding to Figure 'I4 but showing the parts in still another position.

Figure 10 is a view corresponding to Figure 'I but showing the parts in still another position.

, Figure 11 is a diagrammatic view of a hydraulic circuit incorporating another form of panel and showing a portion thereof in one of its positions.

Figure 12 is a view of a hydraulic circuit incorporating still another form of panel and showing a portion thereof in one of its positions.

Figure 13 is a sectional view taken along line I3-l3 of Figure 2.

Figure 14 is an end view of a portion of the panel.

Figure 15 is a side elevation of a portion of the panel.

Referring now to Figure 1, there is shown a cross-sectional view of a unitary control panel I8 comprised of a block I2 having a longitudinal main valve bore I4 extending completely across said block. Bore I4 is provided with a groove forming a pressure port I6 located between two grooves forming motor ports I8 and 20. Spaced apart from port I8 is a groove forming a throttle port 22 and spaced apart from port 2u is a groove of much greater length forming a tank port 24. There is also shown shiftably mounted within bore I4, which is suitably closed at each end thereof by plugs 26 and 28, a control valve 3U of the open-center type i'or the purpose of controlling and directing the flow to and from the aforementioned ports. Pressure duid is admitted and emitted to and from. the panel I8 by means of external connection ports at the rear of said panel shown in Figure 5.

Referring now to Figures 1 and 5, there is shown an external pressure port 32 which is con= nected to the internal pressure port I6 by means of a lateral passage 34 extending from the left side of block I2 to a point of intersection with a vertical passage 36 constructed from the top of block I2 and which intersects pressure port I6 and a passage 38 directly connected to external pressure port 32 and extending to passage 34. The exterior terminus of

passages

34 and 36 are suitably closed by plugs 39. Thus, pressure uid entering external pressure port 32 is conducted to internal pressure port I6 by means of passage 38, lateral passage 34 and vertical passage 36. An external tank port 40 at the rear of panel I8 is connected directly to internal tank port 24 by means of a passage 42. Also at the rear of panel I is a pair of external motor ports 44 and 46. As shown in Figure 3, motor port 44 is connected to internal motor port I8 by means of a passage 48 connected directly to external port 44 which intersects a vertical passage 50 extending from the top of block I2 to a point of intersection with passage 48 and which also intersects port I8. The exterior terminus of passage 50 is closed by a suitable plug I. Thus, iluid entering external motor port 44 is conducted to internal motor port I8 by means of

passages

48 and 50.

Motor port 46 is connected to internal motor port 20 by means of a passage 52 connected directly to port 46 which intersects a vertical passage 54 extending from the bottom of block I2 to 'a point of intersection with a lateral passage 56. Passage 56 extends from the right side of block l2 to a point of intersection with a vertical passage 58 constructed from the top of block I2 and which intersects port 2l)`

Passages

54, 56 and 58 are closed exteriorly by plugs 59. Thus, uid entering external motor port 46 is conducted to motor port 20 by means of passage 52, passage 54, passage 56 and passage 58.

There is shown in Figure 5 an external pilot valve port 60 which is directly connected to the left end of bore I4 by means of a passage 62 and a similar external pilot valve port 64 which Is directly connected to the right end of bore I4 by means of a passage 66. There is shown in Figure 1 a longitudinal stepped passage 68 constructed completely across block I2. A vertical passage l0 and a vertical passage l2, both of which are constructed from the top of block I2, intersect both bore I4 and passage u8 at the left and right ends of said loore and passage respectively. 'lne exterior terminus of passages 68, 'IU and l2 are closed by suitable plugs 14 and, in addition, plugs l5 are inserted in passages 'I0 and 'l2 to prevent uid in these passages lrom escaping through mounting holes 18 which register with said passages. These passages permit the application of pressure uid to either end of the control valve for hydraulic actuation thereof and permit the control valve to shift freely within its bore by providing an outlet for discharging fluid from opposite ends of the bore when the valve is shifted.

If control valve 38 is to be hydraulically operated and pilot valve controlled, a plug 78 is inserted in passage 68 between passages 70 and 72. If control valve 30 is to be operated other than hydraulically, plug 'I8 is removed, a suitable plug is inserted in passage 62, and port 64 is left unplugged to act as a drain port for proper shiiting of valve 30.

Means are provided for regulating uid ow by mounting an adjustable throttle 8u (Figure 6) in a stepped bore 82 extending completely through block IZ from front to rear, said bore being closed at the rear by a suitable plug 84 threaded into throttle 88. In order to maintain a constantly uniform ow of Huid through throttle 80, a pressure-responsive compensating valve 86 (Figure l) for maintaining a constant pressure drop across throttle is mounted in a longitudinal bore 88 extending completely across block I2, bore 88 being closed at both ends thereof by suitable plugs 9D.

In order to connect compensating valve 86 and throttle 80 in series between external motor port 44 and throttle port 22, a vertical passage 92 is constructed from the bottom of block I2 which intersects and continues through compensating valve bore 88 to bore 82 (Figure 1). Throttle 80 is so mounted in bore 82 that a throttling portion 94 thereof (Figure 6) is in alignment with passage 92 and with a passage 96 constructed from the left side of block I2 and also connected to throttle bore 82. A passage 98 constructed from the back of block I2 intersects a passage 96 and continues to a point of intersection with a passage |00 (Figure 4) which is constructed from the top of block I2 to a point of intersection with passage 98 and which also intersects port 22. It should be notedat this point that passage 54 which is constructed from the bottom of block I2 and which extends to a point of intersection with passage 56 also intersects compensating valve bore 88 (Figure 3). Thus, if fluid 4entering external motor port 46 is blocked by control valve 30 at port 20, it may ow through port 46 to passage 52, from passage 52 to passage 54 and compensating valve bore 88 and from said bore to passage 92 (Figure l) whence it is conducted through throttle 80 and thence by means of

passages

96, 98 and |00 to port 22. In order to make compensating Valve 86 truly responsive to the pressure drop across throttle 80, compensating valve 86 is also connected to the tank port 24 of bore I4. 'Referring now to Figure 5, this is accomplished by means of a passage |02 constructed completely across block |2 and closed at both ends by suitable plugs |84, a. passage |06 constructed from the back of block 2 to compensating valve bore 88 and intersecting passage |02, and a vertical passage |08 construct-A ed from the bottom of block I2 extending to a point of intersection with a passage ||0. Passage is constructed from the front of block I2 to a point of intersection with passage |08 and also intersects valve bore I4 at port 24 (Figure 1).

Referring now to Figure 1, compensating valve 86 is comprised mainly of a piston 2 connected to which is a stem ||4 having lands ||6 and ||8. Stem ||4 is shiftable within a sleeve ||1 having ports adapted to cooperate with the passages connected to the compensating valve bore 88. Piston,||2 is shiftable within bore 88 and is responsive to pressure in chambers |20 and |2| to the right and left, respectively, of pistn ||2 in bore 88. Sleeve ||1 contains a groove |22 which is intersected by passage 54 and a passage |24 connected to said groove. Passage |24 is controlled in such a manner by landl l| I8, originally biased to open position by a spring |26. that the flow of fluid therefrom through another passage |28 connected tol a groove |30 which is intersected by passage 92 will be maintained uniformly constant. Land ||8 will partially open and close-passage |24 to admit more or less fluid through passage |28 and groove |30 to passage 92 as determined by the differential pressure existing in chambers |20 and- |2| and acting on opposite sides of piston ||2. Pressure fluid is admitted to chamber |20 to act against piston ||2 and is also able to act against the Referring to Figures 2 and 13, means are also provided for adjustingv the throttle portion 94 within bore 82 between passages 92 and 96 to very close tolerances of uid flow by connecting a splined shaft |50 by means of a pin |52 to a small knob |54. The extreme end of the splined shaft |50 revolves about a gear rack |56 formed in an arcuate slot |58 located in cover plate |48 (Figure 13). Knob |54 is slipped from the side into slots |60 (Figure 2) running completely across raised portion |36 of dial |34 which prevents vertical movement of knob |54, and the splined shaft |50 which is mounted in a bore |62 of raised portion |36 prevents horizontal movement thereof. The diameter of the knob |54 is preferably slightly larger than the width of raised portion |36 for easy operation of the knob. It should be noted that the dial |34 may be rotated to give a coarse adjustment of the throttle or 'the knob |54 maybe rotated to give a fine adjustment of said throttle.

For the purpose of shifting control valve 30 other than hydraulically under the control of an external pilot valve ,connected to the

pilot valve connection

60 and 64, means are provided for shifting the valve )at the front or rear of the panel I0 by having dogs attached to the motor or a machine tool contact a cam connected to a rotatable'shaft which is lever-connected to the valve 30. As shown in Figure 1, a stepped bore |64 is constructed from the top of block |2 to a point of intersection with the groove forming port bottom area of land ||8 by means4 of a drilled p pressure past throttle 80 in chamber |2|, tank port 24 is connected as aforementioned to said chamber by means of passages |06, |02, |88 and |0, passage |06 intersecting bore 88 at a point to the left of piston I2.

A pin 204 (Figure 2) threaded into a bore 206 which extendsfrom the right side of block I2 to bore |66 fits into groove |80 of shaft |68 preventing horizontal movement thereof but leaving shaft |68 free to rotate within bore |66. A dial 208 (Figure 3) connected to shaft |68 permits manual operation of control valve 30. Due to the fact that cam |10 is located on shaft |68 between dial 208 and the face of panel |0, suitable dogs connected to a reversible fluid motor or to a machinetool (not shown) may easily contact It should be noted that control valve 30 is comy pletely shiftable within bore |4 of block |2 by the arrangement of having rotatable shaft |68 at right angles to control valve 38 and connecting said shaft to said valve by means of rod |82. Thus, by rotating dial 288 or by rotating cam I18, the rod |82 will shift valve 38 leftwardly or rightwardly depending upon clockwise or counterclockwise rotation of dial 288 or cam |18. Referring to Figure 6, as dial 288 is rotated a detent 2I 8 backed by a spring 2I2 is forced into successive shallow recesses 2I4 in number equal to the plurality of positions of control valve 38.

In Figure 1, there is shown a control valve 88 of the open-center type shiftably mounted within bore I4. Control valve 38 ls comprised of a spool 2I6 having a groove 2I8 located between an end land 228 and a land 222, a groove 224 located between land 222 and a larger land 226, and a groove 228 located between land 2,26 and a land 238 of larger proportions than land 226. A longitudinal bore 232 extends from the left end of spool 2I6 to a point between

lands

226 and 238. Longitudinal bore 232 is in communication with a plurality of transverse ports 284 located between

lands

228 and 222 and also in communication with a plurality of transverse ports 236 located between lands 228 and 288` Bore 232 is closed at its open end by a suitable plug 238.

In order to show more clearly the different positions of and the manner in which spool 2I6 controls and directs the pressure fluid to and from the spaced ports along bore I4, control valve 38 is shown incorporated in a schematic circuit in Figures 7, 8, 9 and 10. This circuit contains the same elements in all of the figures mentioned but in Figure "I shows valve 38 in a stopped position, in Figure 8 in a rapid return position, in Figure 9 in a feed position, and in Figure 10 in a rapid advance position. There is shown in the figures mentioned a tank 248 connected to a iiuid pump 242 by a conduit 244. The pump 242 is connected to the pressure port I6 of control valve 38 by a conduit 245. The tank port 24 of control 38 is connected to tank 248 by means of a conduit 248.

A reversible fluid motor 258 containing a shiftable piston 252 to which is connected a piston rod 254 is connected from its rod end to motor port 28 by means of a conduit 258 while thel piston end thereof is connected to motor port I8 by means of a conduit 258. A branch conduit 268 connects conduit 256 to one side of the piston II2 of compensating valve 86. A conduit 262 connects compensating valve 86 and conduit 260 to throttle 88 and a conduit 264 connects throttle 80 to motor port 22. A conduit 266 connects the opposite end of piston II2 of compensating valve 86 to tank port 2'4. For hydraulic actuation of control valve 38, a pilot valve 268 is connected to the right end of control valve 38 by a conduit 218, to the left end thereof by a conduit 212, to tank 248 by a conduit 214 and to the pump delivery conduit 246 by aubranch conduit 216. A suitable relief valve 218 is incorporated in the pump delivery conduit and is connected to tank 248 by means of an exhaust conduit 288. For proper shifting of control valve 38, the right and left ends thereof are connected to each other by a conduit 282. A plug 18 will be inserted in conduit 282 when control valve 38 is pilot valve operated.

Referring now to Figure 10, in operation and with control valve 38 shifted completely to the left to a rapid advance position, pressure iiuid will be directed from pump 242 by means of delivery conduit 246 to the pressure port I6 of control valve 38. Land 226 will block motor port 28 from port I6 and fluid is directed by means of

lands

222 and 226 through the medium of groove 224 to port I8 and from such port'to the head end of motor 258 by means of conduit 258 to shift piston 252. Discharging fluid from the rod end of motor 250 is conducted by means of conduit 256 to port 28 at which point lands 226 and 238 will, through the medium of groove 228, direct the uid to tank port 24 from where it will be conducted to tank 248 by means of conduit 248. Due to the fact that the head end of motor 258 is in direct communication with the pump 242, and the rod or discharge end of said motor is in direct communication with tank 248, the total displacement of pump 242 is utilized to cause a rapid advance movement of the motor.

Referring now to Figure 8, a rapid return movement of motor 258 is caused by shifting valve 38 completely to the right. In this position lands 222 and 226, through the medium of groove 224, will direct fluid from pump 242 to motor port 28 where it is conducted to the rod end of the motor by means of conduit 256. Dlscharging fluid from the head end of the motor will be directed to the tank 248 by means of conduit 258, port I8, groove 2I8, transverse port 234, longitudinal bore 232, transverse port 238, groove 228, port 24 and conduit 248. As in the case of the rapid advance movement, a direct communication from the pump 242 is made to one end of the motor, in this case, the rod end, and the head end is directly connected to tank 248 to utilize the complete displacement of the pump to cause a rapid reverse movement of said motor.

Referring now to Figure 9, control valve 38 is shown shifted to the next position subsequent.

to rapid advance, namely, feed position. After piston 252 of motor 258 has been shifted a predetermined distance during rapid advance movement thereof, shaft I68 is rotated to cause spool 2I6 to shift to the position shown. Pressure fluid from pump 242 is directed by

lands

222 and 226 through the medium of groove 224 to port I8 from where it is conducted to the head endl of motor 258 by means of conduit 258. Discharging uid from the rod end of motor 258 is blocked at port 28 by land 226 and must flow to tank 248 by means of

conduits

268, 262 and 264 to port 22. Discharging uid will be regulated to a predetermined flow by throttle 88 with the cooperation of compensating valve 86 in the wellknown manner. Pressure duid in excess of the -total displacement of pump 242 reaching the head end of motor will be exhausted to tank 248 by means of relief valve 218 through exhaust conduit 288. The amount of regulated ow discharging from the motor'through throttle 88 to port 22 will be directed to tank 248 by means of

lands

228 and 222 through the medium of groove 2I8 to transverse port 234, bore 232, transverse ports 236 and groove 228, from which point, lands 226 and 238 will direct the fluid through port 24 to conduit 248, the latter carrying the iluid to tank 248.

Referring now to Figure 7, control valve 38 ls shown shifted to a stopped position. Control valve 38 being of the open-center type, pressure uid from pump 242 is directed from port I6 directly to tank 248. Fluid is directed from port I6 to port I8 through the medium of

lands

222 and 226 and groove 224 and from port I8 to groove 2I8, transverse port 234, bore 232, transverse port 236, groove 228, tank port 24 and conduit 248 to tank 248. It should be noted that in this position pressure port I6 ls in direct com- 9 munication with tank port 24v so that the complete delivery of pump 242 is unloaded to tank 240 in order to stop motor 250.' Land 222 is designed to permit communication inthis position between groove 2I8 and groove 224 through the medium of the groove forming port I8.

The ports spaced along bore I4 are so spaced apart that control valves of different form than control 30 may be shiftably mounted within said bore to produce rapid advance, speed and rapid return movements and to stop said motor. However, where it is necessary to use a closed-center control valve because of certain installation requirements, for instance, the operation of a load device from a branch line in addition to motor .250 while motor 250 is Istopped, a control valve of this type may be shiftably mounted in bore I4 in exactly the same manner as control valve to produce the same movements, of the motor as valve 30 except that the motor 250 will be stopped by blocking ow of pressure fluid at port I6. For this purpose, there is shown in Fig- I ure 11 a closed-center type of control valve 30' of slightly different form than control valve 30. A land 222' of much greater length than the corresponding land 222 of control valve 30 is spaced much closer to a left end land 220' than is land 222 from land 220 of control valve 30. A land 226' corresponding to land 226 of control valve 30 is of slightly greater length than land 226 and a corresponding groove 224' between lands 226' and 222' is smaller than groove 224 of control valve 30. Y

The control valve 30' is'provided witha land 228 and 230' identical to

lands

220 and 230 of control valve 30 and transverse ports 234' and 236' connected by a bore 232' of the same size and approximate location of the corresponding ports and bore of'control valve 38. Control valve 30' is mounted and shiftable to the same positions in identically the same manner as control valve 30 except for one position thereof shown in Figure 11` In the stopped position fluid iiow from pump 242 entering port I6 will be blocked from communication with all other ports spaced along bore I4 by means of lands 222 and 226'.

i l0 I8 to both motor ports I9 and 20 so as to provide a differential advance movement of motor |50.

It should be noted that the identical shaft |88 is connected to all three control valves in identically the same manner and that the shifting of said control valves results from the rotation of said shaft. Shaft |89 may be rotated manually from either the front or from the rear of the panel, although it can be clearly seen that the most practical method is from the front. It can also be seen that by having dogs connected to a machine toll driven by the motor contact switches, after a certain length of travel in either direction of the piston of the motor, so as to energize or de-energize one or more solenoids connected in the well-known manner to shaft |68, that several variations of combination manual and automatic shifting of the control valves are possible.

For example, one method of shifting the control valves would be for the operator to manually shift the control valve in use to a rapid advance from the stopped position. After a certain predetermined range of travel of the machine tool, a dog connected to the machine tool would contact the cam to shift the control valve to a feed position. After a certain range of travel in the feed position. a second dog on the same plane as the first dog would contact the cam to shift the control valve to the stopped position. The operator would then manually shift the control valve to rapid reverse position and after a certain range of travel a third dog, on a different plane than the first or second dog, would contact the cam to rotate shaft |68 in the other direction so as tofshift the control valve again to the stopped position.

Another method would be to have the operator manually shift the control valve from the stop position to a rapid advance position and after a certain range of movement a dog connected to the machine tool would contact the cam to shift the control valve to a feed position.

At the close of the feed movement, a second dog When a reversible iiuid motor of the cylinder f and unbalanced piston type is used in the transmission, it may be desirable to have a differential rapid advance movement of said motor. Accordingly, a control valve of a third type. may be shiftably mounted in bore I4 in identically the same manner as

control valves

30 and 30.

Referring now to Figure 12, there is shown a differential control valve `30" having a groove 2I8" between an end land 220 and a land 222", a groove 224" between land 222" and a center land 226", a groove 221 between land 226" and a land 229, and a groove 228" between land 229 and an end land 230". Control valve 30" is also provided with transverse port 234" betweeln lands 220" and 222" and transverse ports 238" between lands229 and 230", said ports being in communication with each other by a longitudinal bore 232". similar to control valve 30 except for an additional center land 229 which forms an additional groove 221. Also, land 238" is longer in length than that of land 230 of control valve 30. Convtrol valve 39" will direct and control pressure iluid from pump 242 to and from the ports Control valve 30" is somewhat spaced along bore I4 in exactly the same manner l Awould contact fa switch to energize a solenoid to shift the control valve to rapid reverse position. At the end of the rapid reverse movement, another dog would contact the cam to shift the control valve to the stopped position.

Another methodwould be to use an additional solenoid which would be energized at the end of a rapid reverse movement in order to immediately shift the control valve into rapid advance without a stop being made. The complete cycle of rapid advance, feed and rapid Y reverse would be continuous and automatic until the motor was stopped and started again manually by the operator.

It should be' noted that achange of control valves may be made without changing any of the connections or removing the panel from its mounting support simply by removing plug |98, lock nut |99, washer |94, set screw |92, and the rod |82. The control valve may then be removed from either side of the panel by removing eitherof the

plugs

28 or 28. It should also be noted that these elements may be removed and replaced easily for use with an alternative control valvev from the front, side and top of the panel.

Whilethe form of embodiment of the invention as'herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A unitary control panel for use in a hydraulic transmission containing a uid pump and double-acting hydraulic motor to give rapid advance, feed and rapid return movements to and for stopping said motor, said panel comprising in combination a valve block having external connection ports including pressure and exhaust ports and a pair of motor ports, means in the block for limiting fluid oW to a predetermined adjustable feed rate and a single valve in said block, said block having valve ports including a pair of motor ports, a pressure port between the motor ports, an exhaust port adjoining one of the motor ports and a rst port adjoining the other motor port and means connecting each external port with each corresponding valve port and connecting the flow limiting means to one of the motor ports and to the rst valve port, whereby a rst shiftable valve member having means to connect the valve pressure port to the valve exhaust port will stop the motor and a second shiftable valve member of different form having means to block the valve pressure port from communication with all other ports will stop the motor, said valve ports cooperating with the rst and second Valve members to provide rapid advance, feed and rapid return action.

2. A unitary control panel for use in a hydraulic transmission containing a fluid Ipump 'and double-acting hydraulic motor to give rapid advance, feed and rapid return movements to and for stopping said motor, said panel comprising in-combination a valve block having external connection ports including pressure 'and exhaust ports and a pair of motor ports, means in the block for limiting fluid flow to a predetermined adjustable feed rate, a single valve in said block, said block having valve Iports including a pair of motor ports, a pressure port between the motor ponts, an exhaust port adjoining one of the motor ports and a first port adjoining the other motor port` means connecting each external lport with each corresponding valve port and -connecting the flow limiting means to one of the motor ports and -to the rst valve port, whereby a first shiftable valve member having means to connect the valve pressure port to the valve exhaust port -Will stop the motor and a second shiftable valve member of different form having means to block the valve pressure port from communication with all other ports will stop the motor, said valve ports cooperating with the rst and second valve members to -provide rapid advance, feed and rapid return action, means for actuating the valve members manually, means for actuating the valve members mechanically, and means for actuating the valve members hydraulically.

3. A unitary control panel for use in a hydraulic transmission containing a fluid pump and doubleacting hydraulic motor. to give rapid advance, feed and rapid return movements to and for stopping said motor, said panel comprising in combination a valve block having external connection ports inclu-ding pressure and exhaust ports and a pair of motor ports, an adjustable throttle through which uid is adapted to flow at a regulated rate and a compensating valve for maintaining a coni stant pressure drop across the throttle mounted in series in lthe block for producing a feed rate,

and a single valve in s-aid block, said block having valve ports including a pair of motor ports, a pressure port between the motor ports, an exhaust port adjoining one of the motor yports and a iirst port adjoining the other motor port, and means connecting each external port with each corresponding valve port and connecting the throttle and the compensating valve to one of the motor ports and to the first valve port and connecting the compensating valve Ito the exhaust port, whereby a first shiftable valve member having means to connect the valve pressure port to the valve exhaust port `will stop the motor and a second shiftable valve member of different form having means to block the valve pressure port from communication with all other ports will stop the motor, said valve ports cooperating with the first and ysecond valve members to provide rapid advance, feed and rapid return action.

4. A unitary control panel for use in a hydraulic transmission `containing a uid pump and doubleacting hydraulic motor to give rapid advance, feed and rapid return movements to and for stopping said motor, said -panel comprising in combination a valve block having external connection ports including pressure and exhaust ports and a pair of motor ports, means in the block for limiting fluid flow to a predetermined adjustable feed rate and a single valve in said block, said block having valve ports including a pair of motor ports, a pressure port between the motor ports, an exhaust port vadjoining one of the motor ports and a first port adjoining the other motor port, and means connecting each external port with each corresponding valve port and connecting the flow limiting means to one of the motor ports and to the first valve port, whereby a first shiftable valve member having means to yconnect the valve pressure port to the valve exhaust port will stop the motor, a second shiftable valve member of different form having means to block the valve pressure port from communication with all other valve ports will stop the motor and -a third shift- 'able valve member of still another different form willconnect the valve pressure port to both valve motor ports to provide |a dierential rapid advance movement, said valve ports cooperating with the first and second valve members to provide non-differential rapid advance, feed and rapid return movements and cooperating with the third valve member to provide, in addition to the dierential rapid advance action in the same manner of cooperation as with the rst valve, a feed, rapid return and stop action.

5. A unitary control panel for use in a hydraulic transmission ycontaining a fluid vpump and double-acting hydraulic motor to give rapid ad- Vance, feed and rapid return movements to and for stopping said motor, said panel comprising in combination a valve block having external connection ports including pressure and exhaust ports and a pair of motor ports, means in .the block for limiting iiuid flow to a predetermined adjustable feed rate, a single valve in said block, said block having valve ports including a pair of motor ports, a pressure port between the motor ports. an exhaust port adjoining one of the motor ports and a rst port adjoining the other motor port, means connecting each external port with each corresponding valve port and connecting the flow limiting means to one of the motor ports and to the first valve port, whereby a iii-st shiftable Y valve member having means to connect the valve different form having means to block the valve pressure port from communication with all other valve ports will stop the motor and a third shiftable valve member of still 'another different form will connect the valve press-ure port to Iboth valve motor ports to provide a differential rapid advance movement, said valve ports cooperating with the first and second valve members to provide non-differential rapid adv-ance, feed and rapid return movements and cooperating with the third valve member to provide, in addition to the differential rapid advance action in the same manner of'cooperation as with the first valve, a feed, rapid return and stop action, means for actuating the valve members hydraulically, means for actuating the valve members manually, and means for mechanically actuating the valve members.

6. A unitary control panel for use in a hydraulic transmission containing a fluid pump and double-acting hydraulic motor to give rapid advance, feed and rapid return movements to and for stopping said motor, said panel comprising in combination a valve block having external connection ports including pressure and exhaust ports and a pair of motor ports, an adjustable throttle through which fluid is adapted to flow at a regulated rate and a compensating valve for maintaining a constant pressure drop across the throttle mounted in series in the block for producing a feed rate and a single valve in said block, said block having valve ports including a pair of motor ports,l a pressure port between the motor ports, an exhaust port adjoining one of the motor ports and a first port adjoining the other motor port, and means connecting each external port with each corresponding valve port and connecting the throttle and compensating valve to one of the motor ports and to the first valve port, and connecting the compensating valve to the valve exhaust port, whereby a first shiftable valve member having means to connect the valve pressure port to the valve exhaust port will stop the motor, a second shiftable valve member of different form having means to block the valve pressure port from communication with all other valve ports Will stop the motor and a third shiftable valve member of still another different form will connect the valve pressure port to both valve motor ports to provide a differential rapid advance movement, said valve ports cooperating with the rst and second valve members tov provide non-differential rapid advance, feed and rapid return movements and cooperating with the third valve member to provide, in addition to the differential rapid advance action in the same manner of cooperation as with the first valve, a feed. rapid return and stop action.

draulic transmission containing a fluid pump 14 and fluid motor for controlling the action of the motor comprising in combination a valve block, said block having a longitudinal valve bore, ports spaced apart from each other along the bore including two ports for the admission of pressure fluid to either end of the bore, external connection ports connected to the valve bore ports and a transverse bore extending completely through said block, a valve member for controlling the valve ports shiftably mounted completely within the longitudinal bore, a shaft rotatably mounted in the transverse bore, at least one end of which extends from the valve block, means connecting the shaft to the valve member for shifting of the valve member upon rotation of the shaft, and means at an end of the shaft for connecting to the shaft a member adapted to be operated manually and a member adapted to be operated mechanically, whereby said valve member may be shifted manually, mechanically and hydraulically to control the action of the motor.

8. A unitary control panel for use in a hydraulic transmission containing a fluid pump and uld motor for controlling the action of the motor comprising in combination a valve block, said block having a longitudinal valve bore, ports spacedapart from each other along the bore including two ports for the admission of pres-I sure fluid to either end of the bore, external connection ports connected to the valve bore ports and a transverse bore extending completely through said block, a valve member for controlling the valve ports shiftably mounted completely within the longitudinal bore, a shaft rotatably mounted in the transverse bore, both ends of which extend from the valve block, means connecting the shaft to the valve member for shifting of` the valve member upon rotation of the shaft, means at the ends of the shaft for connecting thereto a member adapted to be operated manually, and means at the ends of the shaft for connecting thereto a member adapted to be operated mechanically, whereby said valve member may be shifted manually and mechanically from the front and the rearggf the panel and hydraulically to control the action of the motor.

DUNCAN B. GARDINER. BERNARD L. READMAN.

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

UNITED STATES PAI'ENTS Number Name Date 1,931,048 Wiener Oct. 17, 1933 2,025,244 Morehead et al. Dec. 24, 1935 Twyman Dec. 23, 1941