EP1220992A2 - Pilot device - Google Patents

Pilot device

Info

Publication number
EP1220992A2
EP1220992A2 EP00979379A EP00979379A EP1220992A2 EP 1220992 A2 EP1220992 A2 EP 1220992A2 EP 00979379 A EP00979379 A EP 00979379A EP 00979379 A EP00979379 A EP 00979379A EP 1220992 A2 EP1220992 A2 EP 1220992A2
Authority
EP
European Patent Office
Prior art keywords
pilot
valves
control device
handles
pilot control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00979379A
Other languages
German (de)
French (fr)
Other versions
EP1220992B1 (en
Inventor
Wolfgang Kauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth AG
Bosch Rexroth AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann Rexroth AG, Bosch Rexroth AG filed Critical Mannesmann Rexroth AG
Publication of EP1220992A2 publication Critical patent/EP1220992A2/en
Application granted granted Critical
Publication of EP1220992B1 publication Critical patent/EP1220992B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2004—Control mechanisms, e.g. control levers
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/0422—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks
    • F15B13/0424—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks the joysticks being provided with electrical switches or sensors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
    • G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
    • G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
    • G05G9/047—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks
    • G05G2009/04774—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously the controlling member being movable by hand about orthogonal axes, e.g. joysticks with additional switches or sensors on the handle
    • 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
    • Y10T137/87056—With selective motion for plural valve actuator
    • Y10T137/87072—Rotation about either of two pivotal axes

Definitions

  • the invention relates to a pilot control device, via which at least two mechanically actuable and two electrically or electrohydraulically actuatable control valves can be controlled.
  • Pilot control devices of this type are used in particular in the case of mobile working devices, for example telescopic stackers.
  • Units of the working device for example a shovel, a fork, a lifting cylinder, brushes or a working platform, are controlled via the pilot control device.
  • DE 296 04 210 U1 discloses a pilot control device in which an actuating plate can be pivoted via a handle (joystick) in order to mechanically actuate actuators from four control valves. By pivoting the handle, one or two of the control valves can be actuated in order to control one of the aforementioned consumers. A further swivel lever is provided for two additional control valves, which is operatively connected to the handle.
  • a solution is known from DE 196 30 798 in which a switch is implemented on the handle, via which hydraulically adjustable directional valves can be controlled. More precisely, a changeover valve is actuated via an electrical switch, which switches between two hydraulically operated directional valves, so that the output signal of a pressure reducing valve valve the consumer connected to the activated directional valve can be controlled.
  • the control of the other directional valve requires a switchover of the switchover valve and an activation of the pressure reducing valve.
  • a telescopic rod is designed with a work platform and another tool, for example a fork
  • the platform and the other tool are activated via the pilot control device.
  • the platform in one switch position of the changeover switch, the platform is unlocked, while in the other switch position, the other tool, for example the fork, is tilted or raised.
  • the work platform can be unlocked instead of the inclination of the fork in this variant, so that a risk to the workers and equipment standing on the platform is not excluded.
  • the object of the invention is to create a pre-control device in which the risk of incorrect actuation is minimized.
  • the mechanically actuated control valves are actuated via a swivel lever, which is designed with two handles.
  • Each of the handles carries a switching element, via which only an associated electrically / electro-hydraulically controllable control element can be controlled.
  • each control element is thus assigned its own switching element, the switching elements being spatially spaced from one another in such a way that incorrect actuation is almost impossible. The operator must therefore consciously grasp one of the handles and actuate the switching element formed thereon, to control the connected consumer.
  • the mechanically actuatable control valves are actuated by pivoting the pivoting lever, it being irrelevant which handle is used to actuate the pivoting lever.
  • the pilot valve according to the invention is characterized by an extremely compact structure, since only one common pivoting lever with two separate switching elements is required to actuate six control valves, for example.
  • the switching elements for controlling the electrically operated control valves are designed as potentiometers.
  • the potentiometers can be adjusted depending on the time or by adjusting a slide switch.
  • the pilot control device is designed with four mechanically operated proportional valves which can be actuated by pivoting the pivoting lever which is carried out with two handles.
  • each handle can also be provided with switches that can be used to control other units.
  • the pilot control device is particularly favorable if the two handles or holding sections are arranged in a V-shape with respect to one another.
  • the actuating element for the potentiometer is preferably formed in the central plane of the handle, while the two switches are arranged on both sides of the central plane of the handle.
  • the pilot control device according to the invention can be used particularly advantageously in telescopic forklifts (telehandlers).
  • FIG. 1 A preferred exemplary embodiment of the invention is explained in more detail below with reference to a schematic drawing.
  • the single figure shows a sectional view of a pilot control device according to the invention.
  • the pilot control device 1 shown in the figure has two handles 2, 4, which are pivotally mounted in a housing block 6 and via which four pressure reducing valves (DRV) can be actuated.
  • DVR pressure reducing valves
  • the other two pressure reducing valves lie on the same pitch circle above or below the plane of the drawing.
  • the four pressure reducing valves 8, 10 can be used to control units of a mobile working device, for example a boom or a fork of a telescopic forklift.
  • Each of the handles 2, 4 carries on its front facing the operator a switch 12 for actuating a potentiometer and two switching buttons 14, 16 for actuating switching elements. Via the switch 12 of the potentiometer and the control lines 18 and 19 connected to it, a signal can be emitted to an electrically or electrohydraulically actuated pilot valve 20, 22, which are only indicated schematically in the figure. Further units of the implement can be switched on or off or locked using the switch buttons 14, 16.
  • the two handles 2, 4 are fixed to each other via a coupling element 24.
  • This coupling element 24 has two fork-shaped legs 26, 28, on which the handle 2 and 4 is attached.
  • the two legs 26, 28 converge in a bearing journal 30 which is screwed into a socket of a joint piece 32.
  • This has a swivel joint 34 designed as a universal joint or the like, which allows the handles 2, 4 to be pivoted in such a way that one or two of the pressure reducing valves 8, 10 can be actuated.
  • the two handles 2, 4 can be swung out of the drawing plane practically in any direction.
  • the two handles 2, 4 are arranged in a V-shape to the coupling element 24 converging.
  • This relative arrangement of the two handles 2, 4 allows a handle to be gripped very quickly for actuating one of the two pilot valves 20, 22.
  • the v-shaped relative arrangement also allows two-handed operation, so that both pilot valves 20, 22 can be activated simultaneously.
  • the two handles 2, 4 could also be designed as sections on a closed operating element, which can be designed, for example, with a circumferential ring of handles similar to a steering wheel, etc.
  • the joint piece 32 has a control surface 36 on an annular shoulder removed from the handles 2, 4, against which four actuators 38, 40 for actuating the four directly actuated pressure reducing valves 8, 10 (two of the actuators are not shown) are biased.
  • the actuators 38, 40 are each guided in guide bushes 42, which are each inserted into a valve bore 44 of the housing block 6.
  • a central pressure connection P of the housing block 6 can be connected to a working connection AI, A3 (the two further working connections A2, A4, not shown, are located above or below the drawing level) or a tank connection T.
  • the housing block 6 is closed off by a housing cover 68, to which a bellows 72 which surrounds the actuators 38, 40 is fastened and prevents dirt from penetrating.
  • each pressure reducing valve 8, 10 has a radially enlarged section through which a spring chamber 46 is formed.
  • a support bushing 48 is guided on the peripheral walls of the spring chamber 46 and is biased via a return spring 50 against the associated actuator 38 or 40 and in the direction of a stop position against the associated guide bushing 42.
  • the actuators 38, 40 are acted upon by the return springs 50 in their contact position against the control surface 36.
  • the return spring 50 is supported on the annular surface of the spring chamber 46 which is remote from the guide bush 42.
  • Each pressure reducing valve 8, 10 has a control piston 52 which bore 44 is guided in the radially recessed part of the valve.
  • Each control piston 52 has a transverse bore 54, which is connected via an axial bore, not shown, to the pressure chamber adjacent to the lower (view according to the figure) end face of the control piston 52.
  • the pressure connection P and the tank connection T are via a pressure channel 56 and a tank channel 58 indicated by dash-dotted lines, 60 with the valve bores 44 or with the spring chambers 46 of the four pressure reducing valves 8, 10 connected.
  • each actuator 38, 40 has an axial recess into which the end portion of the control piston 52 can dip with the stop screw 62.
  • each control piston 54 accommodated in the spring chamber 46 carries a spring plate 64 on which a control spring 66 acts, which is supported on the adjacent end face of the support bush 48.
  • the control piston 52 is biased into its illustrated position with respect to the support bush 48, this position being determined by running up the stop screw 62 on the adjacent end face of the support bush 48. From the return spring 50, the control piston 52 is brought via the support bush 48 into the basic position shown, in which the connection between the pressure port P and the associated working port A is blocked.
  • one or two actuators of the four pressure reducing valves 8, 10 are shifted axially downward, while the remaining actuators of the two or three other pressure reducing valves remain in their basic position. Due to the axial displacement of an actuator, the associated support bush 48 is moved downward against the force of the return spring 50 in the illustration, so that a corresponding change in the pretension of the control spring 46, which is also supported on the support bush 48, takes place. By increasing the bias of the control spring 66, the control piston 52 is moved out of the basic position shown, so that the connection between the pressure channel P and the associated working port A is opened via the transverse bore 54 and the axial bore (thereby not shown).
  • That pressure at the working connection A the lower end face of the control piston 52 is subjected to a force which acts against the spring force of the control spring 66.
  • the bias of the rule spring 66 can be changed by changing the pivoting position of the handles 2, 4. If the pressure force acting on the end face at the working connection A exceeds the set spring force of the control spring 66, the control piston 52 is moved into a control position in which the connection of the working connection A with the tank connection T or the pressure connection P in the working connection A is a force pressure corresponding to the rule spring 66 is maintained. That is, the pressure at the working connection A is kept constant depending on the pivot position of the handles 2, 4.
  • the control of the electrically / electrohydraulically actuable pilot valves 20, 22 is carried out by actuating the switches 12 of the handle 2 or the handle 4.
  • These switches 12 can be designed, for example, as sliders, the setting of the potentiometer taking place via the slider setting, as a button, whereby the potentiometer setting depending on the duration of the
  • Button actuation depends, or as rotary knobs.
  • a pilot control device via which at least two mechanically actuatable control valves and two electrically or electro-hydraulically actuated control valves can be controlled.
  • the pilot control device has a swivel lever with two handles, on each of which a switching element for controlling the electrically / electro-hydraulically actuable control valves is provided.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Control Devices (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Servomotors (AREA)

Abstract

The invention relates to a pilot device which is used to control at least two mechanically actuated control valves (8, 10) and two electrically or electrohydraulically actuated control valves (20, 22). The inventive pilot device comprises a pivoted lever with two handles (2, 4) on which respective switch elements (12) for controlling the electrically/electrohydraulically actuated control valves are provided.

Description

Beschreibung Vorsteuergerät Description pilot control unit
Die Erfindung betrifft ein Vorsteuergerät, über das zumindest zwei mechanisch betätigbare und zwei elektrisch oder elektrohydraulisch betätigbare Steuerventile ansteuerbar sind.The invention relates to a pilot control device, via which at least two mechanically actuable and two electrically or electrohydraulically actuatable control valves can be controlled.
Derartige Vorsteuergeräte werden insbesondere bei mobilen Ar- beitsgeräten, beispielsweise Teleskopstaplern eingesetzt. Über das Vorsteuergerät werden Aggregate des Arbeitsgerätes, beispielsweise eine Schaufel, eine Gabel, ein Hubzylinder, Bürsten oder eine Arbeitsplattform angesteuert.Pilot control devices of this type are used in particular in the case of mobile working devices, for example telescopic stackers. Units of the working device, for example a shovel, a fork, a lifting cylinder, brushes or a working platform, are controlled via the pilot control device.
In der DE 296 04 210 Ul ist ein Vorsteuergerät offenbart, bei dem eine Betätigungsplatte über einen Handgriff (Joystick) verschwenkbar ist, um Aktuatoren von vier Steuerventilen mechanisch zu betätigen. Durch Verschwenkung des Handgriffs lassen sich ein oder zwei der Steuerventile betätigen, um einen der vorgenannten Verbrau- eher anzusteuern. Für zwei zusätzliche Steuerventile ist ein weiterer Schwenkhebel vorgesehen, der mit dem Handgriff in Wirkverbindung steht.DE 296 04 210 U1 discloses a pilot control device in which an actuating plate can be pivoted via a handle (joystick) in order to mechanically actuate actuators from four control valves. By pivoting the handle, one or two of the control valves can be actuated in order to control one of the aforementioned consumers. A further swivel lever is provided for two additional control valves, which is operatively connected to the handle.
Nachteilig bei dieser Variante ist, daß ein erheblicher mecha- nischer Aufwand erforderlich ist, um den Handgriff und den Schwenkhebel mechanisch miteinander zu verbinden und zu lagern. Problematisch ist auch die gleichzeitige Ansteuerung der über den Schwenkhebel und der über den Handgriff betätigten Steuerventile, da in diesem Fall beide Betätigungseinrichtungen gleichzeitig verschwenkt werden müssen - eine Einhandbetätigung ist nicht möglich.The disadvantage of this variant is that considerable mechanical effort is required to mechanically connect and store the handle and the swivel lever. Another problem is the simultaneous actuation of the control valves actuated via the pivoting lever and the control valves, since in this case both actuating devices have to be pivoted simultaneously - one-hand operation is not possible.
Um diesen Nachteil auszuräumen, ist aus der DE 196 30 798 eine Lösung bekannt, bei der an dem Handgriff ein Schalter ausgeführt ist, über den hydraulisch verstellbare Wegeventile ansteuerbar sind. Genauer gesagt wird über einen elektrischen Schalter ein Umschaltventil betätigt, das zwischen zwei hydraulisch betätigten Wegeventilen umschaltet, so daß durch das Ausgangssignal eines Druckreduzier- ventils der an das aktivierte Wegeventil angeschlossene Verbraucher angesteuert werden kann. Die Ansteuerung des anderen Wegeventils setzt ein Umschalten des Umschaltventils und ein Aktivieren des Druckreduzierventils voraus.To overcome this disadvantage, a solution is known from DE 196 30 798 in which a switch is implemented on the handle, via which hydraulically adjustable directional valves can be controlled. More precisely, a changeover valve is actuated via an electrical switch, which switches between two hydraulically operated directional valves, so that the output signal of a pressure reducing valve valve the consumer connected to the activated directional valve can be controlled. The control of the other directional valve requires a switchover of the switchover valve and an activation of the pressure reducing valve.
Wird beispielsweise ein Teleskopstab mit einer Arbeitsplattform und einem sonstigen Werkzeug, beispielsweise einer Gabel ausgeführt, so erfolgt die Ansteuerung der Plattform und des weiteren Werkzeuges über das Vorsteuergerät. D.h., in der einen Schaltposition des Um- Schalters wird beispielsweise die Plattform entriegelt, während in der anderen Schaltstellung das weitere Werkzeug, beispielsweise die Gabel geneigt oder angehoben wird.If, for example, a telescopic rod is designed with a work platform and another tool, for example a fork, the platform and the other tool are activated via the pilot control device. In other words, in one switch position of the changeover switch, the platform is unlocked, while in the other switch position, the other tool, for example the fork, is tilted or raised.
Im Falle einer Fehlbetätigung des Umschalters kann bei dieser Variante anstelle der Neigung der Gabel die Arbeitsplattform entriegelt werden, so daß eine Gefährdung der auf der Plattform stehenden Arbeiter und Gerätschaften nicht ausgeschlossen ist.In the event of incorrect operation of the switch, the work platform can be unlocked instead of the inclination of the fork in this variant, so that a risk to the workers and equipment standing on the platform is not excluded.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein Vor- Steuergerät zu schaffen, bei dem die Gefahr einer Fehlbetätigung minimiert ist.In contrast, the object of the invention is to create a pre-control device in which the risk of incorrect actuation is minimized.
Diese Aufgabe wird durch ein Vorsteuergerät mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a pilot control device with the features of patent claim 1.
Erfindungsgemäß erfolgt die Ansteuerung der mechanisch betätigten Steuerventile über einen Schwenkhebel, der mit zwei Handgriffen ausgeführt ist. Jeder der Handgriffe trägt ein Schaltelement, über das nur jeweils ein zugeordnetes elektrisch/elektrohydraulisch an- steuerbares Steuerelement ansteuerbar ist.According to the invention, the mechanically actuated control valves are actuated via a swivel lever, which is designed with two handles. Each of the handles carries a switching element, via which only an associated electrically / electro-hydraulically controllable control element can be controlled.
Erfindungsgemäß ist somit jedem Steuerelement ein eigenes Schaltelement zugeordnet, wobei die Schaltelemente räumlich derart voneinander beabstandet sind, daß eine Fehlbetätigung nahezu ausge- schlössen ist. Die Bedienperson muß somit bewußt einen der Handgriffe erfassen und das daran ausgebildete Schaltelement betätigen, um den daran angeschlossenen Verbraucher anzusteuern. Die Ansteuerung der mechanisch betätigbaren Steuerventile erfolgt erfindungsgemäß durch Verschwenkung des Schwenkhebels, wobei es keine Rolle spielt, über welchen Handgriff der Schwenkhebel betätigt wird.According to the invention, each control element is thus assigned its own switching element, the switching elements being spatially spaced from one another in such a way that incorrect actuation is almost impossible. The operator must therefore consciously grasp one of the handles and actuate the switching element formed thereon, to control the connected consumer. According to the invention, the mechanically actuatable control valves are actuated by pivoting the pivoting lever, it being irrelevant which handle is used to actuate the pivoting lever.
D.h., die Ansteuerung der an die mechanisch betätigten Steuerventile angeschlossenen Verbraucher ist über beide Handgriffe möglich, während die Ansteuerung der an die elek- trisch/elektrohydraulisch betätigten Steuerelemente angeschlossenen Verbraucher nur gezielt durch Ergreifen des zugeordneten Handgriffs erfolgt.This means that the consumers connected to the mechanically operated control valves can be controlled using both handles, while the consumers connected to the electrically / electro-hydraulically operated control elements can only be activated by gripping the assigned handle.
Das erfindungsgemäße Vorsteuerventil zeichnet sich durch einen äußerst kompakten Aufbau aus, da zur Betätigung von beispielsweise sechs Steuerventilen lediglich ein gemeinsamer Schwenkhebel mit zwei getrennten Schaltelementen erforderlich ist.The pilot valve according to the invention is characterized by an extremely compact structure, since only one common pivoting lever with two separate switching elements is required to actuate six control valves, for example.
Erfindungsgemäß wird es bevorzugt, wenn die Schaltelemente zur Ansteuerung der elektrisch betätigten Steuerventile als Potentiome- ter ausgeführt sind. Die Verstellung der Potentiometer kann dabei zeitabhängig oder durch Verstellung eines Schiebeschalters erfolgen.According to the invention, it is preferred if the switching elements for controlling the electrically operated control valves are designed as potentiometers. The potentiometers can be adjusted depending on the time or by adjusting a slide switch.
Bei einem bevorzugten Ausführungsbeispiel wird das Vorsteuergerät mit vier mechanisch betätigten Proporti onalventilen ausgeführt, die durch Verschwenkung des mit zwei Handgriffen ausgeführten Schwenkhebels betätigbar sind.In a preferred exemplary embodiment, the pilot control device is designed with four mechanically operated proportional valves which can be actuated by pivoting the pivoting lever which is carried out with two handles.
Bei einem besonders bevorzugten Ausführungsbeispiel kann jeder Handgriff noch mit Schaltern versehen werden, die zur Ansteuerung weiterer Aggregate verwendbar sind.In a particularly preferred embodiment, each handle can also be provided with switches that can be used to control other units.
Das Vorsteuergerät ist aus ergonomi scher Sicht besonders günstig ausgestaltet, wenn die beiden Handgriffe oder Halteabschnitte v-förmig zueinander angeordnet sind. Bei einer Ausführungsform eines Handgriffs mit Potentiometer und zwei Schaltern wird das Betätigungselement für den Potentiometer vorzugsweise in der Mittelebene des Handgriffs ausgebildet, während die beiden Schalter beidseitig der Mittel ebene des Handgriffs ange- ordnet sind.From an ergonomic point of view, the pilot control device is particularly favorable if the two handles or holding sections are arranged in a V-shape with respect to one another. In one embodiment of a handle with a potentiometer and two switches, the actuating element for the potentiometer is preferably formed in the central plane of the handle, while the two switches are arranged on both sides of the central plane of the handle.
Das erfindungsgemäße Vorsteuergerät läßt sich besonders vorteilhaft bei Teleskopstaplern (Telehandler) einsetzen.The pilot control device according to the invention can be used particularly advantageously in telescopic forklifts (telehandlers).
Sonstige vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der weiteren Unteransprüche.Other advantageous developments of the invention are the subject of the further subclaims.
Im folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand einer schematischen Zeichnung näher erläutert. Die einzige Figur zeigt eine Schnittdarstellung eines erfindungsgemäßen Vorsteuergerätes.A preferred exemplary embodiment of the invention is explained in more detail below with reference to a schematic drawing. The single figure shows a sectional view of a pilot control device according to the invention.
Das in der Figur dargestellte Vorsteuergerät 1 hat zwei Handgriffe 2, 4, die verschwenkbar in einem Gehäuseblock 6 gelagert sind und über die vier Druckreduzierventile (DRV) betätigbar sind. In der Schnittdarstellung gemäß der Figur sind nur die Druckreduzierventile 8, 10 dargestellt, die beiden anderen Druckreduzierventile liegen auf dem gleichen Teilkreis oberhalb bzw. unterhalb der Zeichenebene.The pilot control device 1 shown in the figure has two handles 2, 4, which are pivotally mounted in a housing block 6 and via which four pressure reducing valves (DRV) can be actuated. In the sectional view according to the figure, only the pressure reducing valves 8, 10 are shown, the other two pressure reducing valves lie on the same pitch circle above or below the plane of the drawing.
Über die vier Druckreduzierventile 8, 10 lassen sich Aggregate eines mobilen Arbeitsgerätes, beispielsweise ein Ausleger oder eine Gabel eines Teleskopstaplers ansteuern.The four pressure reducing valves 8, 10 can be used to control units of a mobile working device, for example a boom or a fork of a telescopic forklift.
Jeder der Handgriffe 2, 4 trägt an seiner der Bedienperson zu- weisenden Vorderseite einen Schalter 12 zu Betätigung eines Potentiometers und zwei Schalttasten 14, 16 zur Betätigung von Schaltelementen. Über den Schalter 12 des Potentiometers und die daran angeschlossenen Steuerleitungen 18 bzw. 19 läßt sich jeweils ein Signal an ein elektrisch oder elektrohydraulisch betätigbares Vorsteuerven- til 20, 22 abgeben, die in der Figur lediglich schematisch angedeutet sind. Über die Schalttasten 14, 16 können weitere Aggregate des Arbeitsgerätes zu- bzw. abgeschaltet oder verriegelt werden.Each of the handles 2, 4 carries on its front facing the operator a switch 12 for actuating a potentiometer and two switching buttons 14, 16 for actuating switching elements. Via the switch 12 of the potentiometer and the control lines 18 and 19 connected to it, a signal can be emitted to an electrically or electrohydraulically actuated pilot valve 20, 22, which are only indicated schematically in the figure. Further units of the implement can be switched on or off or locked using the switch buttons 14, 16.
Die beiden Handgriffe 2, 4 sind über ein Koppel element 24 fest miteinander verbunden. Dieses Koppel element 24 hat zwei gabelförmige Schenkel 26, 28, an denen der Handgriff 2 bzw. 4 befestigt ist. Die beiden Schenkel 26, 28 laufen in einem Lagerzapfen 30 zusammen, der in eine Buchse eines Gelenkstückes 32 eingeschraubt ist. Dieses hat ein als Kardangelenk oder ähnliches ausgeführtes Schwenkgelenk 34, das eine Verschwenkung der Handgriffe 2, 4 derart zuläßt, daß eines oder zwei der Druckreduzierventile 8, 10 betätigbar sind. D.h., die beiden Handgriffe 2, 4 lassen sich praktisch in beliebiger Richtung aus der Zeichenebene herausschwenken.The two handles 2, 4 are fixed to each other via a coupling element 24. This coupling element 24 has two fork-shaped legs 26, 28, on which the handle 2 and 4 is attached. The two legs 26, 28 converge in a bearing journal 30 which is screwed into a socket of a joint piece 32. This has a swivel joint 34 designed as a universal joint or the like, which allows the handles 2, 4 to be pivoted in such a way that one or two of the pressure reducing valves 8, 10 can be actuated. In other words, the two handles 2, 4 can be swung out of the drawing plane practically in any direction.
Bei dem in der Figur dargestellten Ausführungsbeispiel sind die beiden Handgriffe 2, 4 v-förmig zum Koppel element 24 hin zusammenlaufend angeordnet. Durch diese Relativanordnung der beiden Handgriffe 2, 4 kann ein Umgreifen eines Handgriffs zur Betätigung eines der beiden Vorsteuerventile 20, 22 sehr schnell erfolgen. Bei besonders kritischen Anwendungen erlaubt die v-förmige Relativanordnung auch eine beidhändige Bedienung, so daß beide Vorsteuerventile 20, 22 gleichzeitig ansteuerbar sind.In the embodiment shown in the figure, the two handles 2, 4 are arranged in a V-shape to the coupling element 24 converging. This relative arrangement of the two handles 2, 4 allows a handle to be gripped very quickly for actuating one of the two pilot valves 20, 22. In particularly critical applications, the v-shaped relative arrangement also allows two-handed operation, so that both pilot valves 20, 22 can be activated simultaneously.
Prinzipiell könnten die beiden Handgriffe 2, 4 auch als Abschnitte an einem geschlossenen Bedienelement ausgeführt sein, das beispielweise mit einem umlaufenden Griffkränz ähnlich eines Lenkrads etc. ausgeführt sein kann.In principle, the two handles 2, 4 could also be designed as sections on a closed operating element, which can be designed, for example, with a circumferential ring of handles similar to a steering wheel, etc.
Das Gelenkstück 32 hat an einer von den Handgriffen 2, 4 entfernten Ringschulter eine Steuerfläche 36, gegen die vier Aktuatoren 38, 40 zur Betätigung der vier direkt betätigten Druckreduzuierven- tile 8, 10 (zwei der Aktuatoren sind nicht dargestellt) vorgespannt sind. Die Aktuatoren 38, 40 sind jeweils in Führungsbuchsen 42 ge- führt, die in jeweils eine Ventil bohrung 44 des Gehäuseblocks 6 eingesetzt sind. Über jedes der Druckreduzierventile 8, 10 kann ein zentraler Druckanschluß P des Gehäuseblockes 6 mit jeweils einem Arbeitsanschluß AI, A3 (die beiden nicht dargestellten weiteren Arbeitsan- Schlüsse A2, A4 befinden sich oberhalb bzw. unterhalb der Zeichenebene) oder einem Tankanschluß T verbunden werden.The joint piece 32 has a control surface 36 on an annular shoulder removed from the handles 2, 4, against which four actuators 38, 40 for actuating the four directly actuated pressure reducing valves 8, 10 (two of the actuators are not shown) are biased. The actuators 38, 40 are each guided in guide bushes 42, which are each inserted into a valve bore 44 of the housing block 6. Via each of the pressure reducing valves 8, 10, a central pressure connection P of the housing block 6 can be connected to a working connection AI, A3 (the two further working connections A2, A4, not shown, are located above or below the drawing level) or a tank connection T.
Der Gehäuseblock 6 ist über einen Gehäusedeckel 68 abgeschlossen, an dem ein die Aktuatoren 38, 40 umgreifender Falten- balg 72 befestigt ist, der ein Eindringen von Schmutz verhindert.The housing block 6 is closed off by a housing cover 68, to which a bellows 72 which surrounds the actuators 38, 40 is fastened and prevents dirt from penetrating.
Der Aufbau der verwendeten Druckreduzierventile 8, 10 ist per se bekannt, so daß sich im folgenden lediglich auf die Beschreibung der wesentlichen Bauelemente beschränkt wird.The structure of the pressure reducing valves 8, 10 used is known per se, so that the following is limited only to the description of the essential components.
Die Ventil bohrung 44 jedes Druckreduzierventils 8, 10 hat einen radial erweiterten Abschnitt, durch den ein Federraum 46 gebildet ist. An den Umfangswandungen des Federraums 46 ist eine Stützbuchse 48 geführt, die über eine Rückstellfeder 50 gegen den zugeordneten Aktuator 38 bzw. 40 und in Richtung einer Anschlagposition gegen die zugeordnete Führungsbuchse 42 vorgespannt ist. Die Aktuatoren 38, 40 werden über die Rückstellfedern 50 in ihre Anlageposition gegen die Steuerfläche 36 beaufschlagt. Die Rückstellfeder 50 ist an der von der Führungsbuchse 42 entfernten Ringfläche des Federraums 46 abge- stützt.The valve bore 44 of each pressure reducing valve 8, 10 has a radially enlarged section through which a spring chamber 46 is formed. A support bushing 48 is guided on the peripheral walls of the spring chamber 46 and is biased via a return spring 50 against the associated actuator 38 or 40 and in the direction of a stop position against the associated guide bushing 42. The actuators 38, 40 are acted upon by the return springs 50 in their contact position against the control surface 36. The return spring 50 is supported on the annular surface of the spring chamber 46 which is remote from the guide bush 42.
Jedes Druckreduzierventil 8, 10 hat einen Steuerkolben 52, der im radial zurückgesetzten Teil der Ventil bohrung 44 geführt ist. Jeder Steuerkolben 52 hat eine Querbohrung 54, die über eine nicht dargestellte Axial bohrung mit dem an die untere (Ansicht nach der Figur) Stirnfläche des Steuerkolbens 52 angrenzenden Druckraum verbunden ist.Each pressure reducing valve 8, 10 has a control piston 52 which bore 44 is guided in the radially recessed part of the valve. Each control piston 52 has a transverse bore 54, which is connected via an axial bore, not shown, to the pressure chamber adjacent to the lower (view according to the figure) end face of the control piston 52.
Der Druckanschluß P und der Tankanschluß T sind über einen Druckkanal 56 bzw. einen strichpunktiert angedeuteten Tankkanal 58, 60 mit den Ventil bohrungen 44 bzw. mit den Federräumen 46 der vier Druckreduzierventile 8, 10 verbunden.The pressure connection P and the tank connection T are via a pressure channel 56 and a tank channel 58 indicated by dash-dotted lines, 60 with the valve bores 44 or with the spring chambers 46 of the four pressure reducing valves 8, 10 connected.
Der Steuerkolben 52 durchsetzt den Federraum 46 und die darin geführte Stützbuchse 48, wobei an dem stützbuchsenseitigen Endabschnitt eine Anschlagschraube 62 am Steuerkolben 52 befestigt ist. Wie aus der Darstellung hervorgeht, hat jeder Aktuator 38, 40 eine Axial ausnehmung, in die der Endabschnitt des Steuerkolbens 52 mit der Anschlagschraube 62 eintauchen kann.The control piston 52 passes through the spring chamber 46 and the support bushing 48 guided therein, a stop screw 62 being fastened to the control piston 52 at the end section on the support bushing side. As can be seen from the illustration, each actuator 38, 40 has an axial recess into which the end portion of the control piston 52 can dip with the stop screw 62.
Der im Federraum 46 aufgenommene Endabschnitt jedes Steuerkolbens 54 trägt einen Federteller 64 an dem eine Regel feder 66 angreift, die an der benachbarten Stirnfläche der Stützbuchse 48 abgestützt ist. Über diese Regel feder 66 ist der Steuerkolben 52 in seine dargestellte Position bezüglich der Stützbuchse 48 vorgespannt, wobei diese Position durch Auflaufen der Anschlagschraube 62 auf die benachbarte Stirnfläche der Stützbuchse 48 bestimmt ist. Von der Rückstellfeder 50 wird der Steuerkolben 52 über die Stützbuchse 48 in die gezeigte Grundposition gebracht, in der die Verbindung zwischen dem Druckanschluß P und dem zugehörigen Arbeitsanschluß A gesperrt ist.The end portion of each control piston 54 accommodated in the spring chamber 46 carries a spring plate 64 on which a control spring 66 acts, which is supported on the adjacent end face of the support bush 48. About this rule spring 66, the control piston 52 is biased into its illustrated position with respect to the support bush 48, this position being determined by running up the stop screw 62 on the adjacent end face of the support bush 48. From the return spring 50, the control piston 52 is brought via the support bush 48 into the basic position shown, in which the connection between the pressure port P and the associated working port A is blocked.
Durch Verschwenken eines der Handgriffe aus der dargestellten Grundposition in eine Schwenkposition werden ein oder zwei Aktuato- ren der vier Druckreduzierventile 8, 10 axial nach unten verschoben, während die verbleibenden Aktuatoren der zwei bzw. drei anderen Druckreduzierventile in ihrer Grundposition verbleiben. Durch die Axial Verschiebung eines Aktuators wird die zugeordnete Stützbuchse 48 gegen die Kraft der Rückstellfeder 50 in der Darstellung nach un- ten verschoben, so daß eine entsprechende Veränderung der Vorspannung der ebenfalls an der Stützbuchse 48 abgestützten Regel feder 46 erfolgt. Durch die Erhöhung der Vorspannung der Regel feder 66 wird der Steuerkolben 52 aus der dargestellten Grundposition herausbewegt, so daß über die Querbohrung 54 und die dadurch nicht darge- stellte Axial bohrung die Verbindung zwischen dem Druckkanal P und dem zugeordneten Arbeitsanschluß A aufgesteuert wird. Dieser Druck am Arbeitsanschluß A beaufschlagt die unten liegende Stirnfläche des Steuerkolbens 52 mit einer Kraft, die gegen die Federkraft der Regelfeder 66 wirkt. Die Vorspannung der Regel feder 66 läßt sich durch Veränderung der Schwenklage der Handgriffe 2, 4 verändern. Falls die auf die Stirnfläche wirkenden Druckkraft am Arbeitsanschluß A die eingestellte Federkraft der Regel feder 66 übersteigt, wird der Steuerkolben 52 in eine Regel position bewegt, in der durch Verbindung des Arbeitsanschlusses A mit dem Tankanschluß T oder dem Druckanschluß P im Arbeitsanschluß A ein der Kraft der Regel feder 66 ent- sprechender Druck aufrechterhalten wird. D.h., der Druck am Arbeitsanschluß A wird in Abhängigkeit von der Schwenkposition der Handgriffe 2, 4 konstant gehalten.By pivoting one of the handles from the illustrated basic position into a pivoted position, one or two actuators of the four pressure reducing valves 8, 10 are shifted axially downward, while the remaining actuators of the two or three other pressure reducing valves remain in their basic position. Due to the axial displacement of an actuator, the associated support bush 48 is moved downward against the force of the return spring 50 in the illustration, so that a corresponding change in the pretension of the control spring 46, which is also supported on the support bush 48, takes place. By increasing the bias of the control spring 66, the control piston 52 is moved out of the basic position shown, so that the connection between the pressure channel P and the associated working port A is opened via the transverse bore 54 and the axial bore (thereby not shown). That pressure at the working connection A, the lower end face of the control piston 52 is subjected to a force which acts against the spring force of the control spring 66. The bias of the rule spring 66 can be changed by changing the pivoting position of the handles 2, 4. If the pressure force acting on the end face at the working connection A exceeds the set spring force of the control spring 66, the control piston 52 is moved into a control position in which the connection of the working connection A with the tank connection T or the pressure connection P in the working connection A is a force pressure corresponding to the rule spring 66 is maintained. That is, the pressure at the working connection A is kept constant depending on the pivot position of the handles 2, 4.
Erfindungsgemäß spielt es keine Rolle, über welchen der Hand- griffe 2, 4 die Verschwenkung des Gelenkstücks 32 und damit die Ansteuerung der Druckreduzierventile 8, 10 erfolgt.According to the invention, it does not matter via which of the handles 2, 4 the pivoting of the joint piece 32 and thus the activation of the pressure reducing valves 8, 10 takes place.
Die Ansteuerung der elektrisch/elektrohydraulisch betätigbaren Vorsteuerventile 20, 22 erfolgt durch Betätigung der Schalter 12 des Handgriffes 2 bzw. des Handgriffes 4. Diese Schalter 12 können beispielsweise als Schieber ausgeführt sein, wobei die Einstellung des Potentiometers über die Schiebereinstellung erfolgt, als Taster, wobei die Potentiometereinstellung in Abhängigkeit von der Dauer derThe control of the electrically / electrohydraulically actuable pilot valves 20, 22 is carried out by actuating the switches 12 of the handle 2 or the handle 4. These switches 12 can be designed, for example, as sliders, the setting of the potentiometer taking place via the slider setting, as a button, whereby the potentiometer setting depending on the duration of the
Tasterbetätigung abhängt, oder als Drehknöpfe.Button actuation depends, or as rotary knobs.
Für den Fall, daß die Bedienperson das Vorsteuerventil 22 betätigen will, wird beispielsweise der in der Figur rechte Handgriff 2 erfaßt und der Schalter 12 betätigt, so daß über die zugeordnete Signalleitung 18 ein Steuersignal an das Vorsteuerventil 20, 22 abge- geben und der daran angeschlossene Verbraucher angesteuert wird. Bei Ansteuerung des anderen Vorsteuerventils 22 muß der in der Figur linke Handgriff 4 in entsprechender Weise erfaßt und betätigt werden.In the event that the operator wants to actuate the pilot valve 22, for example the handle 2 on the right in the figure is detected and the switch 12 is actuated, so that a control signal is sent to the pilot valve 20, 22 via the assigned signal line 18 and the signal is sent thereon connected consumers is controlled. When the other pilot valve 22 is actuated, the handle 4 on the left in the figure must be detected and actuated in a corresponding manner.
Durch diese Auftrennung der Schaltelemente zur Ansteuerung der Vorsteuerventile 20, 22 ist eine Fehlbetätigung nahezu ausgeschlossen. Die vier Druckreduzierventile 8, 10 lassen sich über beide Handgriffe 2, 4 betätigen, so daß die Bedienung wesentlich vereinfacht ist.This separation of the switching elements for actuating the pilot valves 20, 22 virtually eliminates incorrect actuation. The four pressure reducing valves 8, 10 can be operated via both Operate handles 2, 4 so that operation is considerably simplified.
Offenbart ist ein Vorsteuergerät, über das zumindest zwei mechanisch betätigbare Steuerventile und zwei elektrisch oder elek- trohydraulisch betätigbare Steuerventile ansteuerbar sind. Das Vorsteuergerät hat einen Schwenkhebel mit zwei Handgriffen, an denen jeweils ein Schaltelement zur Ansteuerung der elek- trisch/elektrohydraulisch betätigbaren Steuerventile vorgesehen ist. Disclosed is a pilot control device, via which at least two mechanically actuatable control valves and two electrically or electro-hydraulically actuated control valves can be controlled. The pilot control device has a swivel lever with two handles, on each of which a switching element for controlling the electrically / electro-hydraulically actuable control valves is provided.

Claims

Ansprüche Expectations
1. Vorsteuergerät mit einem, vorzugsweise zumindest zwei mechanisch betätigbaren Steuerventilen (8, 10) die über einen Schwenkhebel betätigbar sind und mit einem Schaltelement zur elektrischen Ansteuerung von zumindest zwei weiteren, elek- trisch/elektrohydraulisch betätigbaren Vorsteuerventilen (20, 22), dadurch gekennzeichnet, daß der Schwenkhebel zwei jeweils zumindest einem elektrisch betätigbaren Vorsteuerventil (20, 22) zugeordnete Handgriffe (2, 4) hat, von denen jeder ein Schaltelement (12) zur Betätigung eines der elektrisch betätigbaren Vorsteuerventile (20, 22) trägt.1. Pilot control device with one, preferably at least two mechanically actuatable control valves (8, 10) which can be actuated via a swivel lever and with a switching element for the electrical control of at least two further, electrically / electro-hydraulically actuated pilot control valves (20, 22), characterized that the pivoting lever has two handles (2, 4) assigned to at least one electrically actuable pilot valve (20, 22), each of which carries a switching element (12) for actuating one of the electrically actuated pilot valves (20, 22).
2. Vorsteuergerät nach Patentanspruch 1, dadurch gekennzeichnet, daß das Schaltelement ein Potentiometer zur proportionalen Ansteuerung der Vorsteuerventile (20, 22) hat.2. Pilot control device according to claim 1, characterized in that the switching element has a potentiometer for proportional control of the pilot valves (20, 22).
3. Vorsteuergerät nach Patentanspruch 2, dadurch gekennzeichnet, daß das Potentiometer über eine Schiebetaste des Handgriffs (2, 4) betätigbar ist.3. Pilot control device according to claim 2, characterized in that the potentiometer can be actuated via a slide button of the handle (2, 4).
4. Vorsteuergerät nach einem der vorhergehenden Patentansprüche, gekennzeichnet durch vier mechanisch proportional betätigbare Steuerventile (8, 10), von denen eines oder zwei gemeinsam durch Verschwenkung der Handgriffe (2, 4) betätigbar sind.4. Pilot control device according to one of the preceding claims, characterized by four mechanically proportional actuable control valves (8, 10), one or two of which can be actuated together by pivoting the handles (2, 4).
5. Vorsteuergerät nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß jeder Handgriff (2, 4) zumindest einen Schalter (16) zur Ansteuerung zumindest eines weiteren Ventils hat.5. Pilot control device according to one of the preceding claims, characterized in that each handle (2, 4) has at least one switch (16) for controlling at least one further valve.
6. Vorsteuergerät nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die mechanisch betätigten Ventile Druckreduzierventile (8, 10) sind. 6. Pilot control device according to one of the preceding claims, characterized in that the mechanically operated valves are pressure reducing valves (8, 10).
7. Vorsteuergerät nach einem der vohergehenden Patentansprüche, dadurch gekennzeichnet, daß die beiden Handgriffe (2, 4) v-förmig zueinander angeordnet sind.7. Pilot control device according to one of the preceding claims, characterized in that the two handles (2, 4) are arranged in a V-shape to each other.
8. Vorsteuergerät nach Patentanspruch 7, dadurch gekennzeichnet, daß eine Betätigungstaste (12) für das Potentiometer als Schieber ausgeführt ist, dessen Schiebeachse in der Mittelebene des jeweiligen Handgriffs (2, 4) ausgebildet ist und eine Symmetrieachse für zwei beabstandete Schalttasten (14, 16) bil- det.8. Pilot control device according to claim 7, characterized in that an actuating button (12) for the potentiometer is designed as a slide, the sliding axis of which is formed in the central plane of the respective handle (2, 4) and an axis of symmetry for two spaced switching buttons (14, 16 ) forms.
9. Vorsteuergerät nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß das Vorsteuergerät einem mobilen Arbeitsgerät, beispielsweise einem Teleskopstapler zugeordnet ist. 9. Pilot device according to one of the preceding claims, characterized in that the pilot device is assigned to a mobile working device, for example a telescopic stacker.
EP00979379A 1999-10-15 2000-09-25 Pilot device Expired - Lifetime EP1220992B1 (en)

Applications Claiming Priority (3)

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DE19949802 1999-10-15
DE1999149802 DE19949802A1 (en) 1999-10-15 1999-10-15 Manual input control of hydraulic and electrohydraulic valves through joystick movement and operation of switches
PCT/DE2000/003323 WO2001029428A2 (en) 1999-10-15 2000-09-25 Pilot device

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DE19949802A1 (en) 2001-04-19
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US6932113B1 (en) 2005-08-23
EP1220992B1 (en) 2004-01-14
WO2001029428A2 (en) 2001-04-26

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