US2930402A - Hydraulic multi-valve power unit - Google Patents

Hydraulic multi-valve power unit Download PDF

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US2930402A
US2930402A US61027456A US2930402A US 2930402 A US2930402 A US 2930402A US 61027456 A US61027456 A US 61027456A US 2930402 A US2930402 A US 2930402A
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valve
bore
bores
block
pressure
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Louis J-M Gamet
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LA PRECISION INDUSTRIELLE
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LA PRECISION INDUSTRIELLE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/085—Servomotor systems incorporating electrically operated control means using a data bus, e.g. "CANBUS"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
    • F16K31/1245—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated with more than one valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86035—Combined with fluid receiver
    • Y10T137/86059—Hydraulic power unit

Definitions

  • HYDRAULIC MULTI-VALVE POWER UNIT Filed Sept- 17, 1956 5 Sheets-Sheet 4 1 84- as I March 29, 1960 J. -M. GAMET HYDRAULIC MULTI-VALVE POWER UNIT 5 Sheets-Sheet 5 Filed Sept. 17. 1956 United States Patent 2,930,402 HYDRAULIC MULTLVALVE POWE R UNIT Louis J.'-M. Garnet, Bougival, France, assignor'to La Precision Industrielle (Socit Auonyme), Rueil-Malmai- Certain mechanisms, such as machine tools, are often operated automatically by hydraulic means.
  • such means are capable of transmitting considerable forces along flexible pipes, and apart from the source of hydraulic pressure the operation of these means requires only the functioning of distributing valves to direct the pressure to the mechanism to which pressure is to be applied. By actuating these valves by suitably disposed electric contacts, complete automation can be achieved.
  • a plastic ring may be provided in a groove around the opening of a bore into one of the 5 sides.
  • a further object of the present invention is to provide a hydraulic multivalve power unit in which the operating members of said valves may be dismantled without breaking down or dismantling the hydraulic circuits or the components thereof.
  • a further object of the present invention is to provide a hydraulic multivalve power unit in which the assembly of the various components of said unit simultaneously provides a liquid tight joining of the said components.
  • the present invention includes substantially parallelepipedic blocks, each block being provided with intercommunicating bores and having a cavity extending into said block from its top face to which at least one of said bores leads; a control member, fitted in said cavity, being movable therein-to control therein the opening of said bore.
  • the unit according to the invention can be adapted to provide (1') electric valves I (2) relief valve means providing adjusted pressure (3) pressure-controlled contacts, and
  • the hydraulic pressure in the circuit is produced by a pump immersed in a liquid-filled tank and the :various ganged blocks are mounted on the underside of the lid of said tank; the lid is such that mobile member of each block is accessible through .the .lid.
  • control means of the moving components of the constituentse.g. the electromagnets where provided-- may be located outside the tank so that they are accessible without even requiring the tank lid to be lifted.
  • the blocks used in a complicated hydraulic circuit may be arranged along one edge of the lid, that is to say adjacent to a lateral wall ofthe tank, so that the outlet openings leading to the servo motors can passinstallation for-hydraulic circuits; 7
  • FIG. 2 is a plan view of the installation diagrammatically in Fig. 1; Y
  • Fig. 3 is an enlarged section on IIIIII of' Fig-1.21
  • Fig. 4 is a section on lV-IV of Fig. 3
  • Fig. 5 is an enlarged section on VV of Fig. '2
  • Fig. 6 is asection on VI-VI of Fig. 5
  • Fig. 7 is 'a diagram of another hydraulic circuit
  • Fig. 8 is a diagrammatic representation of the operation of the circuit shown in Fig. 7. a
  • a tank 1 This fluid is placed under pressure by'a pump 2 which may be, for example, a gear pump immersed in said tank.
  • this pump comprises three gearsone driVing'gear-S and-two driven gears. 4 and 5 substantially opposite eachother, supplying pressurized fluid to pipes 6 and'7.
  • the pipe E controls a machinehydraulically actuated tool chuck, shown diagrammatically and designated as a wholeby 8;
  • the pipe 7 controls a feed mechanism, designated as a whole as 9, actuating a tool for machining the workpiece clamped in the chuck 8.
  • the chuck 8 comprises a double-acting jack, i.e. a jack having two opposing compartments 10a and 10b separated by a mobile piston 11. This jack turns as a whole in the bearings 12, together with the chuck.
  • the chuck comprises jaws 13 which grip the workpiece 14 and are actuated by movement of the rod 15 of the piston 11 via articulated links 16.
  • Such a chuck which is well known, grips the workpiece 14 when the pressure fluid is forced into'the com partrnent 10b and opens up and releases the workpiece when the pressure fluid is injected into the compartment 10a and the compartment 10b is emptied.
  • the pressure fluid is supplied to the compartments- 10a and 10b through pipes 17a and ,17b fed by an elec* tric distributor valve 18 which forms part of the unit EV.
  • the valve comprises a cylindrical slide 19 of the spool type whose constrictions define three distribution chambers, namely: two extreme chambers 20a and 20b and the center chamber 200.
  • the pipes 17a and 17b, and the pipes 26a and 26b and the upper end of 6 align with the distribution chambers in a manner that will be apparent from the subsequent description.
  • the pressure fluid is injected into the chamber 20c through pipe 6 in which the pressure is regulated by a relief valve means providing adjusted pressure BPI.
  • This means comprises a valve 21 on which acts a spring 22 which controls the return of the fluid into the tank through the duct 23.
  • a return pipe 24 to the tank is connected with the distributor valve 18; it is connected wtih the fluid return bores 25a and 25b drilled into the body of the distributor and communicating with each other.
  • Each of these pressure-controlled contacts comprises a small piston 27 on which the fluid exerts pressure, a counter spring 28 and a contact member 29 which, as shown, may be closed by increasingthe pressure in MCa or opening in the same condition.
  • the slide 19 is actuated by an electromagnetically-operated plunger 30 associated with an electromagnet comprising a coil 31 and the stationary core 32.
  • the upper extremity of the plunger is conical and is located in a frusto-conical opening of said core; consequently when the coil 31 is energized, the current forces the plunger 30 down, and depresses the slide 19, against the return spring 33.
  • the unit EV is an electric distributor valve.
  • the tool feed device 9 likewise comprises a double acting hydraulic jack having two compartments 34a and 34b separated by the piston 35.
  • the piston rod 36 supports a tool 37 for machining the workpiece 14 and two control cams 38 and 39 which can he slid along the piston rod 36.
  • cam 38 c'o-o'perates a contact device 40 and with cam 39 a contact device 41.
  • the adjustment of the position of the cams 38 and 39 is such that the cam 38 co-operates with contact 40 as soon as the tool approaches the workpiece 14, where as the cam 39 acts on the contact 41 when the tool has terminated its working stroke.
  • the compartments 34a and 34b are supplied by pipes 42a and 42b respectively via a distributor 43 forming part of the electric valve EVD which is similar to the electric valve EV.
  • the essential differences between the electric valve EV and the electric valve EVD are the following:
  • the electric valve EVD comprises no pressure-controlled contact and, on the other hand, its fluid return bores 44a and 44b are connected via a duct 45 with the fiuid return bores 46a and 46b of another electric valve EVR associated with EVD.
  • EVR which is also similar to EV and EVD
  • a direct fluid return bore 47b communicates with the tank 1, the location of this bore in the block EVR being the same as the location of the bores feeding the pipes 17a and 42b in the electric valves EV and EVD respectively.
  • a second fluid return duct 47a (similar in location to 26b of the valve EV) feeds the pressure fluid through a choke or regulating valve R into the return duct 48.
  • a pressure-regulating relief valve unit BP2 associated with a pressure gauge M2.
  • This relief valve means functions in a manner analogous to that of relief valve means BPl.
  • the electromagnet of EVD is excited.
  • the slide 49 will thereupon descend so that the pressure fluid flowing in from pipe 7 is injected into pipe 42b, and as a result the piston 35 is forced to the left.
  • the fluid from compartment 34b is forced through the bore 46b into the lower compartment 50b defined by the slide 51 in the electric valve EVR.
  • the return passage for the fluid from the compartment 34 to the tank 1 is thus formed and free.
  • the cam 38 closes the contact 40 which actuates the electromagnet of the electric valve EVR.
  • the slide of the latter descends and thus interrupts the free discharge of fluid through 47b and, via bores 46a and 47a, makes this discharge possible via the regulating valve R.
  • the cone 52 of this regulating valve is screwed into its seating by turning the milled button 53, thedischarge of fluid through 47a, 48 is more or less restricted whereby the rate of advance of the cutting tool is controlled.
  • the electric circuits have not been illustrated but are easy to visualise. They may comprise in association with contacts 4% and 41 re-energising contact relays to ensure the continuity of the-transient effect achieved by actuating the contacts 40 and 41.
  • Theinvention enables the circuit shown in Fig. 1 to be formed with only the ducts 17a, 17b 42a, 42b and partially 6 and 7 (represented by heavy lines), as separate pipes and all other pipes drawn in fine lines being bores machined in metal blocks belonging to the units EV, EVD, EVR, BPl, BP2, MCa, MCb and R; the ducts shown in dotted lines are suppressed and the fluid returns directly from the correspondingoutlets of the bores to the .tank 1 by gravity.
  • FIG. 1 A plan view of the installation shown in Fig. lis shown in Fig. 2.
  • the electric valve blocks and relief valve blocks are placed side by side, whereas the accessories (pressure-controlled contacts MCa, MCI) and-regulating valve R) are arranged on the backsof the units with which they are associated.
  • the pipes are shown with the reference numbers used in Fig. 1; these pipes are in the form of bores.
  • the electric valve unit EVD and the relief valve unit BP2 areexplained below in greater detail, as an example, with reference to Figs. 3, 4 and 5 and 6 respectively.
  • the electric valve unit EVD comprises a parallelepipedic block 59 traversed from side to side by bores through which the assembly pins 56 can be pushed. Furthermore, a vertical bore 60 goes from the top to the bottom of this block, and in this vertical bore there is provided a bush 61 having a smooth and cylindrical centre bore and on the outside five grooves 62a, 62b, 62c, 62d and 62e which thus form between the bush and the bore five compartments corresponding to the five ducts which are associated with an electric valve, as shown in Fig. 3. Each of said five compartments debouches into the interior of the bush via bores. These five ducts are: the bore 58 which (in Fig.
  • the center chamber 200 may feed either the pipes 42a or 42b via the compartments 62c and 62d or .6211 respectively, while oil may escape from 42a, owing to the upperchamber 20b in the bore 44a,-.via the compartments 62d and 62a and frorn42b in the borwflbwfii the compartments 62a and 62b.
  • the oil under pressure may be admitted through the bore 45 and supplied to the ducts 42aor 42b, owing to the chambers 2012 or 20c, via the compart ments 62 e and 62d or 62a and 62b respectively.
  • oil may escape through the bore 58, owing to the chamber 290, via the compartment 62c and the compartment 6211 or 62d.
  • the bore equivalent'to 42 a is either plugged up or not provided, whereas the bore corresponding to 42% (indicated by 65 in Fig. 2) is pres ent; it debouches externally (on the underside of EVR) through the bore 66 (which corresponds to the vertical bore 42% in the electric valve EVD shown in Figs. 3 and 4), but which, in the vaseof the electric valve EVR, is not closed at its bottom end.
  • the electric valve EVR comprises a bore 67 (Fig. 2) which is an extension of the bore 45 and which connects EVD with the bores 46a and 46b of EVR.
  • the bush 61 in the dif- I ferentelectric valves is closed at its bottom end by'a cap 63 housing the spring 33, and the cap is held in position by pins 69.
  • a washer 70 set at'the lower end of the slide 49 the extremity of the bush 61 serves asan abutment for said slide 49 when the latter is urged up wardly by the action of spring-33.
  • the bush 61 is provided with a collar 71 secured by the screw 72. The collar is fixed to the block by the screw 73-and in this way the bush 61 is fixed'also.
  • the armature 32 of the electromagnet controlling the valve is attached'to the outside of the lid 54 by means of bolts 74, and each block is fixed to the lid by means of bolts 75.
  • a bush such as 61
  • the collar 71 is accessible through a hole in the lid'54 so that, after the armature has been removed by removal of the bolt 74, the whole assembly of the bush 61, slide 49, spring 33 and cap 68 can be withdrawn through this hole by simply unscrewing the screw 73. While this'is being done, all circuits remain undisturbed.
  • the servic ing of the electromagnet does not involve the removal of any piping.
  • the lid 54 is attached to an internal ledge 76' within the tank 1.
  • Short lengths of tubing 77 and the unions 78 are provided for connection of the ducts 42a and 42b (or 17a and 17b in the case of electric valve EV) to their associated servo motors.
  • the relief valve means represented by Figs. 4 and 5 likewise consists of a parallelepipedic block 79 traversed by threaded assembly pins 56. In the plane of symmetry of this block there are provided three bores forming a Ushaped channel. To the bottom'end of therighthand ascending vertical bore 80 there are. connectedthe are used as shown in Fig; 2, is clos'edby'a screw plug87.
  • Thevertical bore 88 which debouches into this horizontal bore 86, thus provides a possible communication between the groove 85 and the tank 1.
  • the relief valve block is attached to the lid 54 by means of bolts 75.
  • the compression of the spring 22 can be adjusted by means of the nut 89, the upward travel of this nut being limited by an annular member 90 held by means of bolts 91.
  • the member 90 is removed, the nut 89, and then the spring and the clappet can be removed without having to dismantle any piping.
  • connection between the electric valves and the relief valve units is substantially achieved by bringing the bores 82 and 52 close together; in similar manner connection between two adjacent electric valves is achieved by bringing the bores 45 and 67 close together.
  • the side faces of the blocks are machined so that they are adequately plane and, around the orifice of one of the bores to be put in communication, there is provided a groove 92 in which a ring 93 of plastic material is inserted.
  • the locking together of the electric valves and relief valve units by means of nuts 57 screwed on to the extremities of the threaded assembly pins-56 compresses the plastic rings 93, and in this manner a perfect seal between the connected bores is ensured.
  • Similar rings are used to ensure a tight connection between EVR and R by means of bores 95 and 96 and between MCa, MCb and EV (ducts 26a and 26b) by means of bores 97 and 98.
  • the members MCa, MCb and R are, as shown in Fig. 1, of similar design as the blocks of the electric valves and relief valve units, that is to say that their mobile component (piston or cone) is housed in a vertical bore in the block and accessible from the top face of said block through the lid 54 of the tank.
  • Figs. 7 and 8 illustrate the application of the invention to the arrangement in cascade form of several relief valve units PBl, PBZ, PB3 which, in turn, control the electric valves EV1, EV2 and EV3.
  • the springs 221, 222, 223 of these relief valve units are adjusted for decreasing compression so that the pump 2 (which, again, has three gears, although the two outlet ones are coupled) supplies to EV1 to strong pres sure determined by the spring 221, a lower pressure determined by the spring 222 to EV2, and an even weaker pressure to EV3 determined by the spring 223.
  • the diagrammatic representations of pressure gauges M1, M2 and M3 show this decrease in the pressure. In fact, since, so long as the servo motor controlled by EV1 has not yet reached the end of its course, the pressure in the circuit C1 remains less than the pressure determined by the spring 221, the circuit C2 is not excited until the first servo motor has reached the end of its course.
  • Fig. 8 shows a diagrammatic representation of the operation of the circuit shown in Fig. 7.
  • This layout comprises six electric values and relief valve blocks in juxta-position.
  • the relief valve units BPl, BP2 and BP3 are such as are shown in Figs. 5 and 6 with the difference, however, that the relief valve. units BPl and BP2 have no screw plugs 87 and instead the bores 88 are closed at their bottom end. On the other hand, BPS has the screw plug 87 inserted, while the screw plug has been removed from the bottom portion of bore 88.
  • the electric valves are of the type described with reference to Figs. 3 and 4, that is to say that the communication between an electric valve and its associated relief valve unit is achieved by means of bores 58 and 82.
  • the electric valves EV2 and EV3 comprise additional bores 99 which start from the flank of these electric valve blocks facing the bores 86 of the relief valve units and debouch into the compartment 62c of the electric valves EV2 and EV3.
  • the level of the bore 86 provided in the relief valve units is essentially that of the compartments 620 so that the passage 99 can be formed by two bores at right angles to each other. In the interest of precision it is, in fact, advantageous to drill all bores perpendicularly to the block faces in which they terminate. Any unused portions of bores are plugged up in known manner.
  • each electric valve originally comprises five superposed bores corresponding to the distributing slide, whereas the auxiliary bores connecting the pressure-controlled contacts or the electric valves among themselves are drilled only as required.
  • the positioning of said bores does not require extreme precision.
  • the use of the bush 61 affords a certain latitude in the positioning of the orifices of the staggered bores of the electric valves in the bore of the associated block.
  • a hydraulic multivalve power unit comprising an upwardly opened liquid containing tank having a flat lateral wall, said lateral wall having an upper part, provided with a horizontal row of at least two apertures; an apertured horizontal lid closing said tank; at least one substantially parallelepipedic valve distributor block secured to the under face of said lid and having a front face in parallel relationship with said wall of the tank and having a top face in parallel relationship with said lid; said block having lateral faces and having a vertical valve bore registering with one aperture of said lid, said block having a first horizontal bore substantially in the middle part thereof and disposed perpendicular to the lateral faces thereof and opening into said vertical valve bore; said front face of said block having two further horizontal bores registering with the apertures of said lateral wall of the tank; one of said horizontal bores opening into said vertical valve bore above said first horizontal bore and the second horizontal bore being downwardly prolongated to communicate with said vertical valve bore below said first horizontal bore; said block having intercommunicating bores communicating ing through said block; a spool type slide in said
  • a hydraulic multivalve power unit in which the upper end of said further vertical bore of said relief valve block is in registering relationship with an aperture of said lid and further comprising a pressure gauge passing through said aperture and connected to said bore.
  • a hydraulic multivalve power unit in which said relief valve block has above the communication of said first horizontal bore with said vertical valve bore a hole issuing in the front face of said block, and in which the upper end'of said vertical valve bore of said relief valve block registers with an aperture of the lid and in which the relief valve means located in said vertical valve bore comprises a slidingly fitted dome shaped valve having apertures adapted to register with the communication of the first horizontal bore with said relief valve block in said valve bore by upward sliding of said dome shaped valve and a coil spring acting on the top of said valve for urging the same downwardly and means passing through the said 10 aperture of said lid for adjusting the compression of said spring.
  • a hydraulic multivalve power unit in which at least one of the'two further horizontal bores ofthe distributor valve block communicates with the rear face of said block and further comprising a pressure-controlled contact block having an inlet open- I I ing in one plane face and means for tightly fastening said pressure-controlled contactblock against the said distributor valve block with the plane face of said contact block in contact with the rear face of said valve block and with the said inlet opening in register relationship with the entrance of one of said further horizontal bores into said rear face.
  • valve distributor block has a further horizontal bore perpendicular to one lateral face thereof and communicating with said 'innerly intercommunicating bores and further comprising at least a further substantially parallelepipedic valve distributor block secured to the under face of said lid and in lateral abutting relationship with said lateral face of said first mentioned valve distributor block, said further valve distributor block having at least a vertical valve bore registering with one aperture of said lid, and intercommunicating I V bores, one end of which enters into the upper part of said valve bore and the other end into the lower part thereof, said further distributor valve block .having a horizontal bore perpendicular to the lateral face thereof, contacting said former distributor valve block, registering with said further horizontal bore thereof and communicating with said intercommunicating bores, the under face of said further block having a further vertical recessed bore prolongated for opening into said valve boreabove the lower part thereof, the rear face of said further block having a further bore opening into said valve bore below the upper part of

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
US61027456 1955-10-03 1956-09-17 Hydraulic multi-valve power unit Expired - Lifetime US2930402A (en)

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FR1133606T 1955-10-03

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US (1) US2930402A (enrdf_load_stackoverflow)
DE (1) DE1066872B (enrdf_load_stackoverflow)
FR (1) FR1133606A (enrdf_load_stackoverflow)
GB (1) GB843393A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115066A (en) * 1959-05-04 1963-12-24 Council Scient Ind Res Piston valves
US11927305B2 (en) * 2016-07-12 2024-03-12 Sew-Eurodrive Gmbh & Co. Kg Drive device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1220223B (de) 1960-02-02 1966-06-30 Clark Equipment Co Getriebe mit einem hydrodynamischen Drehmomentwandler und einer hydraulisch steuerbaren Kupplung
DE1264960B (de) * 1960-07-15 1968-03-28 Kraumath Werk Sickenberg K G Einrichtung zum OEffnen oder Schliessen einer Verbindungsleitung zwischen zwei hydraulischen Arbeitszylindern

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931452A (en) * 1931-09-23 1933-10-17 B M Root Co Hydraulic machine tool feed
US2247140A (en) * 1937-08-09 1941-06-24 Vickers Inc Multiple valve unit
US2247141A (en) * 1938-04-15 1941-06-24 Vickers Inc Multiple valve bank
US2565600A (en) * 1945-02-05 1951-08-28 Ex Cell O Corp Hydraulic control mechanism for machine tools
US2586932A (en) * 1949-07-25 1952-02-26 Vickers Inc Power transmission
US2651324A (en) * 1949-11-01 1953-09-08 New York Air Brake Co Multiple control valve
US2765808A (en) * 1953-09-11 1956-10-09 Tydeman Clarence Walter Valves for the control of hydraulic machinery
US2766572A (en) * 1954-02-11 1956-10-16 Deere & Co Multi-valve hydraulic control system for combines
US2849986A (en) * 1954-09-11 1958-09-02 Klopp Friedrich Hydraulic control mechanism for planing machines

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931452A (en) * 1931-09-23 1933-10-17 B M Root Co Hydraulic machine tool feed
US2247140A (en) * 1937-08-09 1941-06-24 Vickers Inc Multiple valve unit
US2247141A (en) * 1938-04-15 1941-06-24 Vickers Inc Multiple valve bank
US2565600A (en) * 1945-02-05 1951-08-28 Ex Cell O Corp Hydraulic control mechanism for machine tools
US2586932A (en) * 1949-07-25 1952-02-26 Vickers Inc Power transmission
US2651324A (en) * 1949-11-01 1953-09-08 New York Air Brake Co Multiple control valve
US2765808A (en) * 1953-09-11 1956-10-09 Tydeman Clarence Walter Valves for the control of hydraulic machinery
US2766572A (en) * 1954-02-11 1956-10-16 Deere & Co Multi-valve hydraulic control system for combines
US2849986A (en) * 1954-09-11 1958-09-02 Klopp Friedrich Hydraulic control mechanism for planing machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115066A (en) * 1959-05-04 1963-12-24 Council Scient Ind Res Piston valves
US11927305B2 (en) * 2016-07-12 2024-03-12 Sew-Eurodrive Gmbh & Co. Kg Drive device

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DE1066872B (enrdf_load_stackoverflow) 1900-01-01
FR1133606A (fr) 1957-03-29
GB843393A (en) 1960-08-04

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