EP0385242B1 - Front attachment with two clamping arms for a lift truck - Google Patents

Front attachment with two clamping arms for a lift truck Download PDF

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Publication number
EP0385242B1
EP0385242B1 EP19900103296 EP90103296A EP0385242B1 EP 0385242 B1 EP0385242 B1 EP 0385242B1 EP 19900103296 EP19900103296 EP 19900103296 EP 90103296 A EP90103296 A EP 90103296A EP 0385242 B1 EP0385242 B1 EP 0385242B1
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EP
European Patent Office
Prior art keywords
load
swivel
component
axis
bearing part
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.)
Expired - Lifetime
Application number
EP19900103296
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German (de)
French (fr)
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EP0385242A2 (en
EP0385242A3 (en
Inventor
Otmar Kaup
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.)
Kaup & Co KG Gesellschaft fur Maschinenbau GmbH
Kaup GmbH and Co KG
Original Assignee
Kaup & Co KG Gesellschaft fur Maschinenbau GmbH
Kaup GmbH and Co KG
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Publication date
Application filed by Kaup & Co KG Gesellschaft fur Maschinenbau GmbH, Kaup GmbH and Co KG filed Critical Kaup & Co KG Gesellschaft fur Maschinenbau GmbH
Publication of EP0385242A2 publication Critical patent/EP0385242A2/en
Publication of EP0385242A3 publication Critical patent/EP0385242A3/en
Application granted granted Critical
Publication of EP0385242B1 publication Critical patent/EP0385242B1/en
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Classifications

    • 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
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/18—Load gripping or retaining means
    • B66F9/184—Roll clamps

Definitions

  • the invention relates to a front-mounted device for a loader according to the preamble of patent claim 1.
  • front-end devices are used to hold cylindrical bodies which lie on the roadway level in such a way that the axis of the cylindrical body is perpendicular ("transverse") to the longitudinal center plane of the loader.
  • the pivot axis about which the supporting part can be rotated relative to the component attached to the lifting slide, is arranged inclined at an angle of approximately 4 or 5 degrees to the front downward. Then, when picking up, the upper gripper arm reaches forward far enough so that the center of gravity of the cylindrical body lies close to the line of action of force that passes through the center of gravity of the two gripper plates.
  • this inclination of the pivot axis has the disadvantage that when the cylindrical body is pivoted by 90 degrees, its axis is inclined from the top front to the bottom rear relative to the mast.
  • the cylindrical body is to be placed on a stack of other cylindrical bodies, for example rollers, stacked one on top of the other, the front lower edge of the cylindrical body is lower than the rear edge.
  • This inclination of the axis of the cylindrical body if it is to be placed on a horizontal surface, also has the further disadvantage that this horizontal plane on which it is to be placed must not be arranged as high as that with possible full utilization of the Lifting height of the forklift would be possible. This disadvantage cannot be sufficiently compensated for by tilting the mast backwards.
  • front-end implements of another type namely so-called roller tilting clamps
  • the component on which the two gripper arms are pivotally mounted can be tilted by 90 degrees about an axis arranged in the lower region of the front-end implement and parallel to the mast level that a cylindrical body lying on the road with a horizontal axis, the axis of the cylindrical body lying in the longitudinal center plane of the loader, can be accommodated and by tilting the component to which the gripping arms are articulated about said axis into position can be pivoted in which the axis of the cylindrical body is vertical.
  • roller tilting clamp C 4U or C 7U Two configurations are known for the basic arrangement of the roller tilting clamp relative to the lifting frame, namely either in such a way that the suspension is inclined forward by 4 degrees, resulting in a small stem dimension, or in such a way that the axis of the pivoted-up cylindrical body is exactly vertical , whereby this embodiment requires a larger front dimension.
  • An additional swiveling about an axis lying parallel to the road plane in the longitudinal center plane of the loader is neither necessary nor known in such roller tilt clamps (prospectus sheet of the applicant: "roller tilt clamp C 4U or C 7U").
  • the tilting axis must be located at the bottom so that the gripper arms pivot forward to be picked up. If the diameter of the cylindrical body is smaller than its length, the center of gravity lies far forward when picking up from the road.
  • a front-mounted device for a lift truck with a mast and a movable on this lifting carriage is known, on which a component is arranged on a support plate, on which in turn a mounting plate is arranged, one by one in the direction of travel pointing axis has rotatable support member, which axis together with the mounting plate is pivotable relative to said component by a pressure medium cylinder.
  • power-operated grabs for bales can also be attached to the supporting part.
  • a link between the gripper drives and the pressure medium cylinder for pivoting the mounting plate is not disclosed.
  • the invention is therefore based on the object of specifying a front-mounted device of the type described at the outset with which it is possible, despite the inclinability of the pivoting axis of rotation by pivoting the mounting plate with the supporting part, the cylindrical body is inevitably to be set down or raised with the axis at least largely perpendicular.
  • the front part of a lift truck is designated, which has front wheels 2 and a mast 3, on which a lifting carriage with a support plate 4 can be moved.
  • On the support plate 4 is a component 5 of the front-end device suspended on which a slewing ring 6 is attached, on which a support member 7 is pivotally mounted, on which two gripper arms 8 and 10 are pivotally mounted, a gripping plate 9 being pivotally mounted on the gripping arm 8 and a gripping plate on the gripping arm 10 11 is pivotally mounted.
  • the line of action 14, along which the pressing forces of the two gripping arms 8 and 10 are transmitted, is clearly recognizable behind the center of gravity 13 of the cylindrical body 12 to be received.
  • the gripping plate 9 cannot go any further below this drive.
  • the front loader part 1, the front wheel 2 and the mast 3 and the support plate 4 of the lifting carriage according to FIG. 2 are the same parts as the parts provided with the same reference numbers in FIG. 1.
  • the parts provided with the reference numbers 6 to 12 essentially correspond to the parts with the same reference numbers according to FIG. 1.
  • a component 15 is attached to the support plate 4 and the slewing ring 6 is mounted on a component 16, this component 16 being pivotable and tiltable about a pivot axis 18 relative to the component 15, this pivoting and tilting movement being effected by the cylinder piston units 17 - 23, 24 can be effected.
  • the component 15 can be attached to the support plate which is no longer shown in FIG. 3 by means of the claws 20 and 21.
  • the component 16 is connected to a mounting plate 22, on which the slewing ring 6 is mounted, in which the supporting part 7 is pivotably mounted about the axis 33. This pivoting movement about the axis 33 is effected by a drive motor 34.
  • the cylinder 17 is fastened, in which a piston 23 is displaceable, the piston rod 24 of which is connected to the claw 21 or the component 15 via a bearing pin 25.
  • the gripping arm 8 is connected in a manner not recognizable in FIG. 3 to the piston rod of a cylinder-piston unit, the cylinder 26 of which is mounted on the supporting part 7 by means of a bearing bolt 27.
  • the gripper arm 8 is pivotable about the bearing pin 28.
  • the gripper arm 10 is also connected to the piston rod of a cylinder-piston unit, the cylinder 29 of which is mounted in the support part 7 by means of a bearing pin 31, the gripper arm 10 being mounted in the support part 7 by means of a pin 30.
  • the drive motor 34 which is provided for pivoting by means of the rotating ring 6 on the component 22 and is rotatably pivotable about the axis 33, is arranged in the upper region of the component 22.
  • This drive motor 34 has a certain extent in the direction of the longitudinal center plane of the loader. Since to pivot the component 22 about the axis 18 counterclockwise in the region of the pivot axis 18, a distance between the components 22 and 15 is required so that the lower region of the component 22 can pivot towards the lower region of the component 15 when tilted, this will optimally used by the space required by arranging the drive motor 34 in this upper region without increasing the overall required front dimension only for the purpose of accommodating the drive motor 34.
  • FIG. 4 shows the same components as in FIG. 3, but this time in the position in which the pressure chamber is of the cylinder 17 is pressurized with the result that the piston 23 is extended with the piston rod 24. This has the consequence that the mounting plate 22 is parallel to the trailer component 15 and thus the pivot axis 33 is parallel to the roadway level of the loader 1.
  • a safety shut-off valve 41 and the plug-in connection 42 and, via the safety shut-off valve 43, the line 44 within the front-mounted device are connected to the line 40 arranged in the front part 1 of the lift loader, a safety pressure relief valve 45 being connected between the two lines 39 and 44.
  • the line 39 branches into the two lines 47 and 48, wherein in each of these two lines 47 and 48 there is a non-return valve 49 which can be opened from the line 44 and the line 47 to the piston-side pressure chamber of the cylinder 29 and the line 48 to the piston-side Pressure chamber of the cylinder 26 leads.
  • the line 44 leads to the pressure chamber of the cylinder 29 on the piston rod side.
  • a line 50 branches off from the line 44 and leads to the pressure chamber of the cylinder 26 on the piston rod side, in which line 50 a shut-off valve 51 which can be actuated as a function of the pivoting rotational position of the support part 7 is arranged to be able to relieve the pressure only on the cylinder 29, if necessary, while the piston-side pressure chamber of the cylinder 26 remains closed.
  • circuit according to FIG. 5 corresponds to the known prior art.
  • a branch line 52 is connected to line 39, which leads to the piston-side pressure chambers of the two cylinders 17 connected in parallel and arranged in parallel to one another.
  • a two-position / two-way valve 53 which can be actuated mechanically by means of the actuation 54 is arranged in this branch line 52.
  • the mode of action is as follows: With the line 44 under pressure and the line 39 under no pressure, the truck moves as far as possible to the cylindrical body 12, so that the gripping plate 9 is moved as far as possible under the cylindrical body 12. As a result of the dead weight of the supporting part 7 with the gripping arms 8 and 10, these parts pivot into the position shown in FIG. 2 and FIG. 3.
  • the gripper arm 10 can open or close by means of the cylinder 29, while the cylinder 26 of the gripper arm 8 is not actuated, since the valve 51 is closed in this pivoting position of the support part 7.
  • the line 44 is now arbitrarily relieved of pressure and the line 39 is pressurized, with the piston in the cylinder 29 initially extending so that the cylindrical body 12 is gripped. If the pressure has risen sufficiently, the pistons 23 in the cylinders 17 are also extended so that the component 16 with the fastening plate 22 and thus the rotating ring 6 and the support part 7 with the gripping arms 8 and 10 pivot into the position shown in FIG. 4, ie in the position in which the pivot axis 33 of the support member 7 is parallel to the plane of the road.
  • the lifting carriage is now first raised and then the rotary swivel drive 34 is pressurized, so that the support part 7 with the gripping arms 8 and 10 swivels by 90 degrees, so that the axis of the cylindrical body 12 is perpendicular to the plane of the road.
  • the valve 53 is moved into the closed position by means of the switching cam 55, so that the position shown in FIG. 4 is maintained even when the gripper arm cylinder 29 is relieved of pressure or the gripper arm cylinders 29 and 26 are relieved of pressure.
  • the cylindrical body 12 can thus be set down exactly.
  • the cylinders 17 are only relieved of pressure when the supporting part 7 pivots about the pivot axis 33, so that the switching cam 55 actuates the actuating part 54 of the valve 53 and the line 39 is relieved of pressure.
  • Figure 6 shows the switch cam pressed and in this position the valve 53 is in the open position.
  • the support part 7 must first be rotated into the position in which the gripper arm axes of the gripper arms 8 and 10 lie parallel to the plane of the roadway. In this position, the pressure chambers on the piston rod side of the cylinders 26 and 29 of the gripping arms 8 and 10 are moved apart completely by pressure and then the support member 7 is pivoted while maintaining the pressure so that the valve 53 is closed.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Description

Die Erfindung betrifft ein Vorbaugerät für Hublader nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a front-mounted device for a loader according to the preamble of patent claim 1.

Diese Vorbaugeräte dienen zum Aufnehmen von zylindrischen Körpern, die auf der Fahrbahnebene derart liegen, daß die Achse des zylindrischen Körpers senkrecht ("quer") zur Längsmittelebene des Hubladers liegt.These front-end devices are used to hold cylindrical bodies which lie on the roadway level in such a way that the axis of the cylindrical body is perpendicular ("transverse") to the longitudinal center plane of the loader.

Bisher bekannt sind derartige Vorbaugeräte in einer Ausgestaltungsform, bei der die Schwenkachse, um die das Schwenken des Tragteiles erfolgt, starr zumindest annähernd senkrecht zur Tragplatte des Hubschlittens steht. Da die Greifplatte des unteren Greifarmes nicht bis unter den Schwerpunkt des aufzunehmenden zylindrischen Körpers zwischen diesen und die Bodenfläche gepreßt werden kann, ergibt sich aus dieser Anordnung der Nachteil, daß die zwischen den Andrückschwerpunkten der beiden Greifplatten an je einem Greifarm verlaufende Kraftwirkungslinie hinter dem Schwerpunkt des zylindrischen Körpers liegt, so daß dieser nicht sicher erfaßt werden kann. Es ist auch nicht möglich, diesem Nachteil dadurch zu entgehen, daß der obere Greifarm oder zumindest dessen Greifplatte verlängert wird, da die sich dann ergebene Kinematik nur für zylindrische Körper mit einem ganz bestimmten Durchmesser geeignet ist und die Folge hätte, daß zylindrische Körper kleineren Durchmessers zu weit vor dem Schwerpunkt erfaßt werden.Stems of this type have previously been known in an embodiment in which the pivot axis about which the pivoting of the supporting part takes place is rigidly at least approximately perpendicular to the supporting plate of the lifting carriage. Since the gripping plate of the lower gripping arm cannot be pressed between the center surface and the bottom surface below the center of gravity of the cylindrical body to be received, this arrangement has the disadvantage that the line of action of force running between the pressing centers of gravity of the two gripping plates on one gripping arm behind the center of gravity of the cylindrical body is located so that it can not be detected reliably. It is also not possible to avoid this disadvantage by lengthening the upper gripping arm or at least its gripping plate, since the resulting kinematics are only suitable for cylindrical bodies with a very specific diameter and would have the consequence that cylindrical bodies of smaller diameter too far before the focus.

Es ist aber auch bereits bekannt, diesen Nachteil dadurch zu umgehen, daß die Schwenkachse, um die das Tragteil gegenüber dem an den Hubschlitten angehängten Bauteil verdrehbar ist, in einem Winkel von etwa 4 oder 5 Grad nach vorne unten geneigt angeordnet ist. Dann greift beim Aufnehmen der obere Greifarm weit genug nach vorne, so daß der Schwerpunkt des zylindrischen Körpers dicht bei der Kraftwirkungslinie liegt, die durch die Schwerpunkte der beiden Greifplatten geht. Diese Neigung der Schwenkachse hat aber den Nachteil zur Folge, daß dann, wenn der zylindrische Körper um 90 Grad verschwenkt ist, dessen Achse von oben vorne nach unten hinten gegenüber dem Hubgerüst geneigt ist. Wenn beispielsweise der zylindrische Körper auf einen Stapel von übereinander gestapelten anderen zylindrischen Körpern, z.B. Rollen, abgesetzt werden soll, dann liegt die vordere untere Kante des zylindrischen Körpers tiefer als die hintere Kante. Das birgt einerseits die Gefahr, daß mit dieser Vorderkante gegen den obersten bereits abgesetzten zylindrischen Körper gestoßen wird, und führt andererseits zu dem Nachteil, daß dann, wenn dieser oberste zylindrische Körper abgesetzt werden soll, er beim Öffnen der Greifarme nach hinten kippend abklappend absinkt und somit nicht genau kontrolliert abgesetzt werden kann. Diese Schrägstellung der Achse des zylindrischen Körpers hat dann, wenn dieser auf eine horizontale Fläche abgesetzt werden soll, auch den weiteren Nachteil, daß diese horizontale Ebene, auf der abgesetzt werden soll, nicht so hoch angeordnet sein darf, wie das bei möglicher voller Ausnutzung der Hubhöhe des Gabelstaplers möglich wäre. Dieser Nachteil läßt sich auch nicht durch Neigen des Hubgerüstes nach hinten hinreichend ausgleichen.However, it is also already known to circumvent this disadvantage in that the pivot axis, about which the supporting part can be rotated relative to the component attached to the lifting slide, is arranged inclined at an angle of approximately 4 or 5 degrees to the front downward. Then, when picking up, the upper gripper arm reaches forward far enough so that the center of gravity of the cylindrical body lies close to the line of action of force that passes through the center of gravity of the two gripper plates. However, this inclination of the pivot axis has the disadvantage that when the cylindrical body is pivoted by 90 degrees, its axis is inclined from the top front to the bottom rear relative to the mast. If, for example, the cylindrical body is to be placed on a stack of other cylindrical bodies, for example rollers, stacked one on top of the other, the front lower edge of the cylindrical body is lower than the rear edge. On the one hand, this harbors the danger that this front edge will hit the uppermost cylindrical body that has already been set down, and on the other hand leads to the disadvantage that when this top cylindrical body is to be set down, when the gripping arms are opened, it drops and tilts backwards can therefore not be sold in a precisely controlled manner. This inclination of the axis of the cylindrical body, if it is to be placed on a horizontal surface, also has the further disadvantage that this horizontal plane on which it is to be placed must not be arranged as high as that with possible full utilization of the Lifting height of the forklift would be possible. This disadvantage cannot be sufficiently compensated for by tilting the mast backwards.

Ferner sind Vorbaugeräte einer anderen Gattung, nämlich sogenannte Rollenkippklammern bekannt, bei denen das Bauteil, an dem unmittelbar die beiden Greifarme schwenkbar gelagert sind, um eine zur Hubgerüstebene und zur Fahrbahnebene parallele, im unteren Bereich des Vorbaugerätes angeordnete Achse um 90 Grad kippbar ist, so daß ein zylindrischer Körper, der mit horizontaler Achse auf der Fahrbahn liegt, wobei die Achse des zylindrischen Körpers in der Längsmittelebene des Hubladers liegt, aufgenommen werden kann und durch Kippen des Bauteiles, an dem die Greifarme angelenkt sind, um die genannte Achse in die Lage geschwenkt werden kann, in der die Achse des zylindrischen Körpers vertikal steht. Auch hierbei sind für die Grundanordnung der Rollenkippklammer gegenüber dem Hubgerüst zwei Ausgestaltungsformen bekannt, nämlich entweder derart, daß die Aufhängung um 4 Grad nach vorne geneigt ist, wobei sich ein geringes Vorbaumaß ergibt, oder derart, daß bei hochgeschwenktem zylindrischen Körper dessen Achse genau vertikal steht, wobei diese Ausgestaltungsform ein größeres Vorbaumaß erfordert. Ein zusätzliches Schwenken um eine parallel zur Fahrbahnebene in der Längsmittelebene des Hubladers liegende Achse ist bei derartigen Rollenkippklammern weder erforderlich noch bekannt (Prospektblatt der Anmelderin: "Rollenkippklammer C 4U oder C 7U"). Die Kippachse muß unten angeordnet sein, damit die Greifarme zum Aufnehmen nach vorne schwenken. Ist der Durchmesser des zylindrischen Körpers kleiner als seine Länge, liegt beim Aufnehmen von der Fahrbahn der Schwerpunkt weit vorne.Furthermore, front-end implements of another type, namely so-called roller tilting clamps, are known, in which the component on which the two gripper arms are pivotally mounted can be tilted by 90 degrees about an axis arranged in the lower region of the front-end implement and parallel to the mast level that a cylindrical body lying on the road with a horizontal axis, the axis of the cylindrical body lying in the longitudinal center plane of the loader, can be accommodated and by tilting the component to which the gripping arms are articulated about said axis into position can be pivoted in which the axis of the cylindrical body is vertical. Here too, two configurations are known for the basic arrangement of the roller tilting clamp relative to the lifting frame, namely either in such a way that the suspension is inclined forward by 4 degrees, resulting in a small stem dimension, or in such a way that the axis of the pivoted-up cylindrical body is exactly vertical , whereby this embodiment requires a larger front dimension. An additional swiveling about an axis lying parallel to the road plane in the longitudinal center plane of the loader is neither necessary nor known in such roller tilt clamps (prospectus sheet of the applicant: "roller tilt clamp C 4U or C 7U"). The tilting axis must be located at the bottom so that the gripper arms pivot forward to be picked up. If the diameter of the cylindrical body is smaller than its length, the center of gravity lies far forward when picking up from the road.

Durch die DE-C-1 029 738 ist ein Vorbaugerät für einen Hublader mit einem Hubgerüst und einem an diesem verfahrbaren Hubschlitten bekannt, an dem an einer Tragplatte ein Bauteil angeordnet ist, an dem wiederum eine Befestigungsplatte angeordnet ist, die ein um eine in Fahrtrichtung weisende Achse drehbares Tragteil aufweist, wobei diese Achse zusammen mit der Befestigungsplatte durch einen Druckmittelzylinder gegenüber dem besagten Bauteil verschwenkbar ist. Anstelle der üblichen Gabeln können an dem Tragteil auch nicht näher beschriebene kraftbetätigte Greifer für Ballen angebracht sein. Eine Verknüpfung der Greiferantriebe mit dem Druckmittelzylinder für die Verschwenkung der Befestigungsplatte ist nicht offenbart.From DE-C-1 029 738 a front-mounted device for a lift truck with a mast and a movable on this lifting carriage is known, on which a component is arranged on a support plate, on which in turn a mounting plate is arranged, one by one in the direction of travel pointing axis has rotatable support member, which axis together with the mounting plate is pivotable relative to said component by a pressure medium cylinder. Instead of the usual forks, power-operated grabs for bales, which are not described in more detail, can also be attached to the supporting part. A link between the gripper drives and the pressure medium cylinder for pivoting the mounting plate is not disclosed.

Durch die US-A-4 435 119 ist ein Hublader der eingangs beschriebenen Gattung bekannt, bei dem gleichfalls keine zwangsläufige hydraulische Verknüpfung der Antriebszylinder für die Greiferarme einerseits und des Schwenkzylinders für die Befestigungsplatte und das Tragteil andererseits vorhanden ist. Auch sind keine Mittel für die Verhinderung einer schwerkraftabhängigen Rückstellung der Befestigungsplatte mit dem Tragteil bei Druckabfall im Schwenkzylinder angegeben. Es bleibt also der Geschicklichkeit der Bedienungsperson überlassen, Rollen mit genau senkrecht stehender Achse auf anderen Rollen abzusetzen oder zwischen stehende Rollenstapel einzuführen oder aus den Rollenstapeln herauszuheben.From US-A-4 435 119 a lift loader of the type described is known, in which there is also no inevitable hydraulic linkage of the drive cylinder for the gripper arms on the one hand and the pivot cylinder for the mounting plate and the support part on the other hand. Also, no means are given for preventing gravity-dependent resetting of the mounting plate with the support part in the event of a pressure drop in the swivel cylinder. It is therefore left to the skill of the operator to place rolls with a precisely vertical axis on other rolls or to insert them between standing rolls or to lift them out of the rolls.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Vorbaugerät der eingangs beschriebenen Gattung anzugeben, mit dem es ermöglicht wird, trotz der Neigbarkeit der Schwenk-Drehachse durch Verschwenken der Befestigungsplatte mit dem Tragteil zylindrische Körper zwangsläufig mit zumindest weitgehend senkrecht stehender Achse abzusetzen oder anzuheben.The invention is therefore based on the object of specifying a front-mounted device of the type described at the outset with which it is possible, despite the inclinability of the pivoting axis of rotation by pivoting the mounting plate with the supporting part, the cylindrical body is inevitably to be set down or raised with the axis at least largely perpendicular.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of patent claim 1.

Die vorteilhaften Wirkungen der erfindungsgemäßen Lösung sind in der Detailbeschreibung ausführlich erläutert: Es ist zum Beispiel nicht möglich, daß die Drehschwenkachse des Tragteils bei einer Druckentlastung der Antriebszylinder für die Greifarme sich automatisch aus der waagrechten Lage absenkt, solange die Greifarmachsen in einer Stellung senkrecht zur Straßenoberfläche stehen.The advantageous effects of the solution according to the invention are explained in detail in the detailed description: For example, it is not possible for the pivoting axis of the support part to automatically lower from the horizontal position when the drive cylinders for the gripper arms are relieved of pressure, as long as the gripper arm axes are in a position perpendicular to the road surface stand.

Eine besonders vorteilhafte weitere Ausgestaltung des Erfindungsgegenstandes ist gekennzeichnet durch die Merkmale im Kennzeichen des Patentanspruchs 2.A particularly advantageous further embodiment of the subject matter of the invention is characterized by the features in the characterizing part of patent claim 2.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert.

Figur 1
zeigt in Seitenansicht eine Ausgestaltungsform gemäß dem bisher bekannten Stand der Technik.
Figur 2
zeigt in Seitenansicht die Ausgestaltungsform gemäß der Erfindung.
Figur 3
zeigt ebenfalls in Seitenansicht einen Ausschnitt aus Figur 2 in größerem Maßstab.
Figur 4
zeigt den gleichen Ausschnitt wie Figur 3 in gleichem Maßstab wie in Figur 3, jedoch in einer anderen Betriebslage.
Figur 5
zeigt ein Schaltschema zu einem hydraulisch betätigten Vorbaugerät mit Zylinderkolbenaggregaten für die Greifarme und Zylinderkolbenaggregaten für die Neige- Schwenkbewegung des Tragteils und einem Ventil in der Zuleitung in diesen Zylinderkolbenaggregaten.
Figur 6
zeigt den mittleren Bereich eines Vorbaugerätes in Ansicht von hinten mit dem Ventil gemäß Figur 5 und dessen Betätigung.
The invention is explained in more detail below with reference to the drawing.
Figure 1
shows a side view of an embodiment according to the previously known prior art.
Figure 2
shows a side view of the embodiment according to the invention.
Figure 3
also shows a side view of a section of Figure 2 on a larger scale.
Figure 4
shows the same section as Figure 3 on the same scale as in Figure 3, but in a different operating position.
Figure 5
shows a circuit diagram for a hydraulically operated front-mounted device with cylinder-piston units for the gripping arms and cylinder-piston units for the tilting-pivoting movement of the supporting part and a valve in the feed line in these cylinder-piston units.
Figure 6
shows the central area of a front-mounted device in a view from behind with the valve according to Figure 5 and its actuation.

Mit 1 ist das Vorderteil eines Hubladers bezeichnet, der Vorderräder 2 und ein Hubgerüst 3 aufweist, an dem ein Hubschlitten mit einer Tragplatte 4 verfahrbar ist. Auf die Tragplatte 4 ist ein Bauteil 5 des Vorbaugerätes aufgehängt, an dem ein Drehkranz 6 befestigt ist, an dem ein Tragteil 7 dreh-schwenkbar gelagert ist, an dem zwei Greifarme 8 und 10 schwenkbar gelagert sind, wobei an dem Greifarm 8 eine Greifplatte 9 schwenkbar gelagert ist und an dem Greifarm 10 eine Greifplatte 11 schwenkbar gelagert ist. Die Kraftwirkungslinie 14, längs der die Andrückkräfte der beiden Greifarme 8 und 10 übertragen werden, liegt deutlich erkennbar hinter dem Schwerpunkt 13 des aufzunehmenden zylindrischen Körpers 12. Die Greifplatte 9 des Greifarmes 8 kann aber infolge des Gewichtes des zylindrischen Körpers 12 auch nicht weiter unter diesen fahren.With 1 the front part of a lift truck is designated, which has front wheels 2 and a mast 3, on which a lifting carriage with a support plate 4 can be moved. On the support plate 4 is a component 5 of the front-end device suspended on which a slewing ring 6 is attached, on which a support member 7 is pivotally mounted, on which two gripper arms 8 and 10 are pivotally mounted, a gripping plate 9 being pivotally mounted on the gripping arm 8 and a gripping plate on the gripping arm 10 11 is pivotally mounted. The line of action 14, along which the pressing forces of the two gripping arms 8 and 10 are transmitted, is clearly recognizable behind the center of gravity 13 of the cylindrical body 12 to be received. However, due to the weight of the cylindrical body 12, the gripping plate 9 cannot go any further below this drive.

Das Hubladervorderteil 1, das Vorderrad 2 und das Hubgerüst 3 und die Tragplatte 4 des Hubschlittens gemäß Figur 2 sind die gleichen Teile wie die in Figur 1 mit den gleichen Bezugszahlen versehenen Teile. Auch die mit den Bezugszahlen 6 bis 12 versehenen Teile stimmen im wesentlichen mit den mit den gleichen Bezugszahlen versehenen Teilen gemäß Figur 1 überein. Doch ist in diesem Fall an die Tragplatte 4 ein Bauteil 15 angehängt und ist der Drehkranz 6 an einem Bauteil 16 gelagert, wobei dieses Bauteil 16 um eine Schwenkachse 18 gegenüber dem Bauteil 15 schwenk-neigbar ist, wobei diese Schwenk-Neigebewegung durch die Zylinderkolbenaggregate 17 - 23, 24 bewirkt werden kann.The front loader part 1, the front wheel 2 and the mast 3 and the support plate 4 of the lifting carriage according to FIG. 2 are the same parts as the parts provided with the same reference numbers in FIG. 1. The parts provided with the reference numbers 6 to 12 essentially correspond to the parts with the same reference numbers according to FIG. 1. In this case, however, a component 15 is attached to the support plate 4 and the slewing ring 6 is mounted on a component 16, this component 16 being pivotable and tiltable about a pivot axis 18 relative to the component 15, this pivoting and tilting movement being effected by the cylinder piston units 17 - 23, 24 can be effected.

In dem vergrößerten Maßstab der Figur 3 ist zu erkennen, daß das Bauteil 15 mittels der Klauen 20 und 21 an die in Figur 3 nicht mehr dargestellte Tragplatte anhängbar ist. Das Bauteil 16 ist mit einer Befestigungsplatte 22 verbunden, an der der Drehkranz 6 gelagert ist, in dem schwenkbar das Tragteil 7 um die Achse 33 drehschwenkbar gelagert ist. Diese Drehschwenkbewegung um die Achse 33 wird durch einen Antriebsmotor 34 bewirkt. An der Befestigungsplatte 22 ist der Zylinder 17 befestigt, in dem ein Kolben 23 verschiebbar ist, dessen Kolbenstange 24 über einen Lagerzapfen 25 mit der Klaue 21 bzw. dem Bauteil 15 verbunden ist.On the enlarged scale of FIG. 3 it can be seen that the component 15 can be attached to the support plate which is no longer shown in FIG. 3 by means of the claws 20 and 21. The component 16 is connected to a mounting plate 22, on which the slewing ring 6 is mounted, in which the supporting part 7 is pivotably mounted about the axis 33. This pivoting movement about the axis 33 is effected by a drive motor 34. On the mounting plate 22, the cylinder 17 is fastened, in which a piston 23 is displaceable, the piston rod 24 of which is connected to the claw 21 or the component 15 via a bearing pin 25.

Der Greifarm 8 ist in in Figur 3 nicht mehr erkennbarer Weise mit der Kolbenstange eines Zylinderkolbenaggregates verbunden, dessen Zylinder 26 mittels eines Lagerbolzens 27 an dem Tragteil 7 gelagert ist. Der Greifarm 8 ist um den Lagerzapfen 28 schwenkbar. Der Greifarm 10 ist in ebenfalls nicht erkennbarer Weise mit der Kolbenstange eines Zylinderkolbenaggregates verbunden, dessen Zylinder 29 mittels eines Lagerzapfens 31 in dem Tragteil 7 gelagert ist, wobei der Greifarm 10 mittels eines Zapfens 30 in dem Tragteil 7 gelagert ist.The gripping arm 8 is connected in a manner not recognizable in FIG. 3 to the piston rod of a cylinder-piston unit, the cylinder 26 of which is mounted on the supporting part 7 by means of a bearing bolt 27. The gripper arm 8 is pivotable about the bearing pin 28. The gripper arm 10 is also connected to the piston rod of a cylinder-piston unit, the cylinder 29 of which is mounted in the support part 7 by means of a bearing pin 31, the gripper arm 10 being mounted in the support part 7 by means of a pin 30.

In der in Figur 3 dargestellten Lage ist der Druckraum in dem Zylinder 17 drucklos mit der Folge, daß das Tragteil 7 mit den Greifarmen 8 und 10 infolge von deren Eigengewicht um die Neig-Schwenkachse 18 nach vorne geneigt ist, d. h. der Kolben 23 ist ganz in den Zylinder 17 eingefahren mit der Folge, daß die Schwenkachse 33, um die das Tragteil 7 mittels des Drehkranzes 6 gegenüber dem Bauteil 16 schwenkbar ist, nach vorne unten geneigt ist wie in Figur 2 dargestellt.In the position shown in Figure 3, the pressure space in the cylinder 17 is depressurized, with the result that the support member 7 with the gripping arms 8 and 10 is inclined forward about the tilt-pivot axis 18 due to their own weight, i. H. the piston 23 is fully retracted into the cylinder 17, with the result that the pivot axis 33, about which the supporting part 7 can be pivoted with respect to the component 16 by means of the rotating ring 6, is inclined forward and downward, as shown in FIG.

Der zum Dreh-Schwenken mittels des Drehkranzes 6 an dem Bauteil 22 um die Achse 33 dreh-schwenkbar gelagerten Tragteiles vorgesehene Antriebsmotor 34 ist im oberen Bereich des Bauteiles 22 angeordnet. Dieser Antriebsmotor 34 hat eine gewisse Erstreckung in Richtung der Längs-Mittelebene des Hubladers. Da zu Schwenken des Bauteiles 22 um die Achse 18 entgegensetzt dem Uhrzeigersinn in Bereich der Schwenkachse 18 ein Abstand zwischen den Bauteilen 22 und 15 erforderlich ist, damit der untere Bereich des Bauteiles 22 beim Neigen an den unteren Bereich des Bauteiles 15 heranschwenken kann, wird dieser durch den Abstand erforderliche Raum durch Anordnung des Antriebsmotors 34 in diesem oberen Bereich optimal genutzt, ohne das insgesamt erforderliche Vorbaumaß nur zum Zwecke der Unterbringung des Antriebmotors 34 zu vergrößern.The drive motor 34, which is provided for pivoting by means of the rotating ring 6 on the component 22 and is rotatably pivotable about the axis 33, is arranged in the upper region of the component 22. This drive motor 34 has a certain extent in the direction of the longitudinal center plane of the loader. Since to pivot the component 22 about the axis 18 counterclockwise in the region of the pivot axis 18, a distance between the components 22 and 15 is required so that the lower region of the component 22 can pivot towards the lower region of the component 15 when tilted, this will optimally used by the space required by arranging the drive motor 34 in this upper region without increasing the overall required front dimension only for the purpose of accommodating the drive motor 34.

In Figur 4 sind die gleichen Bauteile wie in Figur 3 dargestellt, jedoch diesmal in der Position, in der der Druckraum des Zylinders 17 mit Druck beaufschlagt ist mit der Folge, daß der Kolben 23 mit der Kolbenstange 24 ausgefahren ist. Das hat die Folge, daß die Befestigungsplatte 22 parallel zu dem Anhängebauteil 15 liegt und somit die Schwenkachse 33 parallel zur Fahrbahnebene des Hubladers 1 liegt.FIG. 4 shows the same components as in FIG. 3, but this time in the position in which the pressure chamber is of the cylinder 17 is pressurized with the result that the piston 23 is extended with the piston rod 24. This has the consequence that the mounting plate 22 is parallel to the trailer component 15 and thus the pivot axis 33 is parallel to the roadway level of the loader 1.

Im Schaltschema gemäß Figur 5 ist zu erkennen, daß die im Vorderteil 1 des Hubladers angeordnete Hydraulikleitung 35 über ein Sicherheitsabschlußventil 36 an die Steckverbindung 37 angeschlossen ist, an die andererseits innerhalb des Vorbaugerätes über das Sicherheitsabschlußventil 38 die Leitung 39 angeschlossen ist.In the circuit diagram according to FIG. 5 it can be seen that the hydraulic line 35 arranged in the front part 1 of the loader is connected via a safety shut-off valve 36 to the plug connection 37, to which the line 39 is connected within the front-mounted device via the safety shut-off valve 38.

In ebensolcher Weise ist an die im Vorderteil 1 des Hubladers angeordnete Leitung 40 ein Sicherheitsabschlußventil 41 und die Steckverbindung 42 und über das Sicherheitsabschlußventil 43 die Leitung 44 innerhalb des Vorbaugerätes angeschlossen, wobei zwischen die beiden Leitungen 39 und 44 ein Sicherheitsdruckbegrenzungsventil 45 geschaltet ist.In a similar manner, a safety shut-off valve 41 and the plug-in connection 42 and, via the safety shut-off valve 43, the line 44 within the front-mounted device are connected to the line 40 arranged in the front part 1 of the lift loader, a safety pressure relief valve 45 being connected between the two lines 39 and 44.

Die Leitung 39 verzweigt sich in die beiden Leitungen 47 und 48, wobei in jeder dieser beiden Leitungen 47 und 48 ein von der Leitung 44 aus aufsteuerbares Rücklaufsperrventil 49 angeordnet ist und wobei die Leitung 47 zum kolbenseitigen Druckraum des Zylinders 29 und die Leitung 48 zum kolbenseitigen Druckraum des Zylinders 26 führt.The line 39 branches into the two lines 47 and 48, wherein in each of these two lines 47 and 48 there is a non-return valve 49 which can be opened from the line 44 and the line 47 to the piston-side pressure chamber of the cylinder 29 and the line 48 to the piston-side Pressure chamber of the cylinder 26 leads.

Die Leitung 44 führt zum kolbenstangenseitigen Druckraum des Zylinders 29. Von der Leitung 44 zweigt eine Leitung 50 ab, die zum kolbenstangenseitigen Druckraum des Zylinders 26 führt, wobei in dieser Leitung 50 ein von der Schwenkdrehlage des Tragteils 7 abhängig betätigbares Absperrventil 51 angeordnet ist, um im Bedarfsfall auch nur den Zylinder 29 druckentlasten zu können, während der kolbenseitige Druckraum des Zylinders 26, abgesperrt bleibt.The line 44 leads to the pressure chamber of the cylinder 29 on the piston rod side. A line 50 branches off from the line 44 and leads to the pressure chamber of the cylinder 26 on the piston rod side, in which line 50 a shut-off valve 51 which can be actuated as a function of the pivoting rotational position of the support part 7 is arranged to be able to relieve the pressure only on the cylinder 29, if necessary, while the piston-side pressure chamber of the cylinder 26 remains closed.

Insoweit entspricht die Schaltung gemäß Figur 5 dem bekannten Stand der Technik.In this respect, the circuit according to FIG. 5 corresponds to the known prior art.

Gemäß der Erfindung ist an die Leitung 39 eine Zweigleitung 52 angeschlossen, die zu den kolbenseitigen Druckräumen der beiden zueinander parallel geschalteten und zueinander parallel angeordneten Zylinder 17 führt. In dieser Zweigleitung 52 ist ein mittels der Betätigung 54 mechanisch betätigbares Zweistellung/Zweiwegeventil 53 angeordnet.According to the invention, a branch line 52 is connected to line 39, which leads to the piston-side pressure chambers of the two cylinders 17 connected in parallel and arranged in parallel to one another. A two-position / two-way valve 53 which can be actuated mechanically by means of the actuation 54 is arranged in this branch line 52.

In Figur 6 ist zu erkennen, daß das Betätigungsteil 54 des Ventils 53, welches am Bauteil 22 angeordnet ist, durch eine Schaltnocke 55, welche am Tragteil 7 befestigt ist, betätigbar ist.It can be seen in FIG. 6 that the actuating part 54 of the valve 53, which is arranged on the component 22, can be actuated by a switching cam 55, which is fastened on the supporting part 7.

Die Wirkungsweise ist folgende:
Bei druckbeaufschlagter Leitung 44 und druckloser Leitung 39 fährt der Stapler so weit wie möglich an den zylindrischen Körper 12 heran, so daß die Greifplatte 9 so weit wie möglich unter den zylindrischen Körper 12 gefahren wird. Infolge des Eigengewichtes des Tragteiles 7 mit den Greifarmen 8 und 10 schwenken diese Teile in die in Figur 2 und Figur 3 dargestellte Lage. Dabei kann der Greifarm 10 mittels des Zylinders 29 öffnen oder schließen, während der Zylinder 26 des Greifarmes 8 nicht betätigt wird, da in dieser Drehschwenklage des Tragteils 7 das Ventil 51 geschlossen ist.The mode of action is as follows:
With the line 44 under pressure and the line 39 under no pressure, the truck moves as far as possible to the cylindrical body 12, so that the gripping plate 9 is moved as far as possible under the cylindrical body 12. As a result of the dead weight of the supporting part 7 with the gripping arms 8 and 10, these parts pivot into the position shown in FIG. 2 and FIG. 3. The gripper arm 10 can open or close by means of the cylinder 29, while the cylinder 26 of the gripper arm 8 is not actuated, since the valve 51 is closed in this pivoting position of the support part 7.

Nunmehr wird willkürlich die Leitung 44 von Druck entlastet und die Leitung 39 mit Druck beaufschlagt, wobei zunächst einmal der Kolben in dem Zylinder 29 ausfährt, so daß der zylindrische Körper 12 erfaßt wird. Ist der Druck hinreichend angestiegen, werden auch die Kolben 23 in den Zylindern 17 ausgefahren, so daß das Bauteil 16 mit der Befestigungsplatte 22 und damit der Drehkranz 6 und das Tragteil 7 mit den Greifarmen 8 und 10 in die in Figur 4 dargestellte Lage schwenken, d. h. in die Lage, in der die Drehschwenkachse 33 des Tragteiles 7 parallel zur Fahrbahnebene liegt.The line 44 is now arbitrarily relieved of pressure and the line 39 is pressurized, with the piston in the cylinder 29 initially extending so that the cylindrical body 12 is gripped. If the pressure has risen sufficiently, the pistons 23 in the cylinders 17 are also extended so that the component 16 with the fastening plate 22 and thus the rotating ring 6 and the support part 7 with the gripping arms 8 and 10 pivot into the position shown in FIG. 4, ie in the position in which the pivot axis 33 of the support member 7 is parallel to the plane of the road.

Zur weiteren Handhabung wird nunmehr zunächst einmal der Hubschlitten angehoben und sodann der Drehschwenkantrieb 34 druckbeaufschlagt, so daß das Tragteil 7 mit den Greifarmen 8 und 10 um 90 Grad schwenkt, so daß die Achse des zylindrischen Körpers 12 senkrecht zur Fahrbahnebene steht. In dieser Lage wird mittels des Schaltnockens 55 das Ventil 53 in die Schließstellung gefahren, so daß die in Figur 4 dargestellte Lage aufrecht erhalten bleibt, auch wenn der Greifarmzylinder 29 von Druck entlastet wird, bzw. die Greifarmzylinder 29 und 26 von Druck entlastet werden. Der zylindrische Körper 12 kann somit exakt abgesetzt werden. Die Zylinder 17 werden erst dann von Druck entlastet, wenn das Tragteil 7 um die Schwenkachse 33 schwenkt, so daß der Schaltnocken 55 das Betätigungsteil 54 des Ventils 53 betätigt und die Leitung 39 von Druck entlastet ist.For further handling, the lifting carriage is now first raised and then the rotary swivel drive 34 is pressurized, so that the support part 7 with the gripping arms 8 and 10 swivels by 90 degrees, so that the axis of the cylindrical body 12 is perpendicular to the plane of the road. In this position, the valve 53 is moved into the closed position by means of the switching cam 55, so that the position shown in FIG. 4 is maintained even when the gripper arm cylinder 29 is relieved of pressure or the gripper arm cylinders 29 and 26 are relieved of pressure. The cylindrical body 12 can thus be set down exactly. The cylinders 17 are only relieved of pressure when the supporting part 7 pivots about the pivot axis 33, so that the switching cam 55 actuates the actuating part 54 of the valve 53 and the line 39 is relieved of pressure.

Figur 6 zeigt den Schaltnocken gedrückt und in dieser Stellung ist das Ventil 53 in der Offen-Stellung.Figure 6 shows the switch cam pressed and in this position the valve 53 is in the open position.

Soll ein mit senkrechter Achse stehender, zylindrischer Körper aufgenommen werden, d. h. ergriffen und angehoben werden, muß zunächst einmal das Tragteil 7 in die Lage gedreht werden, in der die Greifarmachsen der Greifarme 8 und 10 parallel zur Fahrbahnebene liegen. In dieser Lage werden durch Druckbeaufschlagung die kolbenstangenseitigen Druckräume der Zylinder 26 und 29 der Greifarme 8 und 10 ganz auseinander gefahren und sodann unter Aufrechterhalten des Druckes das Tragteil 7 geschwenkt, damit das Ventil 53 geschlossen wird. Sodann werden die kolbenseitigen Druckräume der Zylinder 26 und 29 beaufschlagt, damit der zylindrische Körper 12 erfaßt werden kann, wobei bei diesen beiden letzten Vorgängen infolge der Drehschwenklage der Greifarme 8 und 10 bzw. der Tragteile 7 das Ventil 53 geschlossen bleibt, wobei in der einen Lage nur der Greifarm 10 durch den Zylinder 29 bewegt wird, während der Greifarm 8 unbewegt bleibt, da bei dieser Drehschwenklage des Tragteiles 7 das Ventil 51 gesperrt ist. Dieses Ventil 51 ist nur bei einer Drehschwenklage des Tragteils 7 von 45 Grad geöffnet. Der Greifarm 8 kann auch nur in dieser Position betätigt werden.If a cylindrical body standing with a vertical axis is to be picked up, ie gripped and lifted, the support part 7 must first be rotated into the position in which the gripper arm axes of the gripper arms 8 and 10 lie parallel to the plane of the roadway. In this position, the pressure chambers on the piston rod side of the cylinders 26 and 29 of the gripping arms 8 and 10 are moved apart completely by pressure and then the support member 7 is pivoted while maintaining the pressure so that the valve 53 is closed. Then the piston-side pressure chambers of the cylinders 26 and 29 are acted upon so that the cylindrical body 12 can be grasped, the valve 53 remaining closed in these two last operations due to the pivoting position of the gripping arms 8 and 10 or the support parts 7, in one Position only the gripper arm 10 is moved by the cylinder 29, while the gripper arm 8 remains stationary, since the valve 51 is blocked at this pivoting position of the support member 7. This valve 51 is only in a pivoting position of the support member 7 of Open 45 degrees. The gripper arm 8 can also be operated only in this position.

Claims (4)

  1. Front attachment for lift trucks for handling at least approximately cylindrical bodies, preferably rolls (12) made from bodies thin in relation to the width and extending in surface with parallel edges like paper, steel strip or the like, the lift truck being provided with a lift slide movable on a lift frame (3) with a load-bearing plate (4) on the latter and the front attachment having a component provided for fitting to the load-bearing plate (4) on which a load-bearing part 7 is swivel-mounted by means of a drive (34) around an at least approximately horizontal axis (33), two clamping arms (8, 10) on this load-bearing part (7) each operable by a cylinder piston unit (26, 29) being swivel-mounted around axes (28, 30) parallel to one another by means of a further drive (26, 29) and where, also:
    a) an intermediate component (16, 22) to which the clamping arms (8 and 10) are connected can be swivelled, opposite the component (15, 20, 21) attachable to the load-bearing plate of the lift slide, around an axis (18) lying at least approximately parallel to the carriageway plane by a swivel angle limited by means of an inclining-swivelling angle limitation device, where, in the one swivel limit position of the intermediate component (16, 22) in one of the possible operating rotary positions of the load-bearing part (7) the axes (18, 30) of the clamping arms (8 and 10) are perpendicular to the carriageway plane,
    b) the component, on which the load-bearing part (7) is swivel-mounted, is the intermediate component (16, 22),
    c) the swivel angle by which the intermediate component (16, 22) opposite the component (15) can be swivelled around the axis (18) is so limited that in the second limit position, when a cylindrical body (12) lying on the carriageway plane is taken up, the connecting line (14) betwen the contact pressure centres of gravity of the two clamping plates (9, 11) each mounted on a clamping arm (8, 10) runs close by the axis (13) of the cylindrical body (12),
    characterized in that
    d) a branch line (52) leading to the cylinder piston units (17, 23, 24) of the inclining-swivelling drive is connected to the line (39) connected to the pressure compartments of the cylinder piston units (26 and 29) pressure-impacted for closing the clamping arms (8 and 10),
    e) a two-way valve (53) is arranged in the branch line (52) and
    f) the two-way valve (53) is operable around the axis (33) by means a control cam (55) dependent on the swivel position of the load-bearing part (7) opposite the load-bearing plate (4) in such a way that the two-way valve, when the clamping arm axes (28, 30) are placed vertically into the closed position, is controlled.
  2. Front attachment according to Claim 1, characterized in that, when the pressure compartment of the cylinder piston unit (17, 23,24) of the inclining-swivelling drive is not impacted, the swivel axis (33) of the load-bearing part (7) is directed forward and downward, the cylinder piston unit (17, 23, 24) of the inclining-swivelling angle drive being so arranged in the lower area of the intermediate component (16, 22) and on the other side of the component (15) that when the pressure compartment of this cylinder piston unit (17, 23, 24) is impacted with pressure the swivel axis of the load-bearing part (7) lies at least approximately parallel to the carriageway plane and that the control cam (55) is so arranged that, when the load-bearing part (7) is turned into the position in which the clamping arm swivel axes (28, 30) lie parallel to the carriageway plane, the valve (53) in the branch line (52) is controlled into the open position and, when the load-bearing part (7) is turned into the position in which the clamping arm axes (28, 30) lie vertical to the carriageway plane, the valve (53) in the branch line (52) is controlled into the closed position.
  3. Front attachment according to Claim 1, characterized in that the inclining-swivelling angle limitation device limits the inclining-swivelling angle to an angle between 3.5 degrees and 5.5 degrees.
  4. Front attachment according to Claim 1, characterized in that, in the case of a lift truck with an inclinable lift frame (3), the swivel angle by which the intermediate component (16, 22), to which load-bearing part (7) is rotationally mounted, opposite the component (15, 20, 21) attachable to the load-bearing plate (4), is approximately as large as the angle by which the lift frame (3) can be inclined backwards out of the vertical.
EP19900103296 1989-02-25 1990-02-21 Front attachment with two clamping arms for a lift truck Expired - Lifetime EP0385242B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3905994 1989-02-25
DE19893905994 DE3905994C2 (en) 1989-02-25 1989-02-25 Front-mounted device with two gripper arms for holding cylindrical bodies in a horizontal or vertical position with hydraulic drive and with a circuit for controlling the same

Publications (3)

Publication Number Publication Date
EP0385242A2 EP0385242A2 (en) 1990-09-05
EP0385242A3 EP0385242A3 (en) 1990-12-27
EP0385242B1 true EP0385242B1 (en) 1993-12-22

Family

ID=6374988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900103296 Expired - Lifetime EP0385242B1 (en) 1989-02-25 1990-02-21 Front attachment with two clamping arms for a lift truck

Country Status (3)

Country Link
EP (1) EP0385242B1 (en)
DE (1) DE3905994C2 (en)
ES (1) ES2047726T3 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD26254A (en) *
US2596477A (en) * 1949-01-21 1952-05-13 Towmotor Corp Lift truck grab arm mechanism for cylindrical bodies
DE903555C (en) * 1951-01-25 1954-02-08 Hans Still A G Gripper for stacking devices
DE1076562B (en) * 1956-09-25 1960-02-25 Yale & Towne Mfg Co Forklift with adjustable and rotating clamp for cylindrical loads
DE1822477U (en) * 1958-03-22 1960-11-24 Erwin Baas FRONT OR REAR LOADERS ON TRUCKS OD. DGL.
US3449009A (en) * 1967-06-09 1969-06-10 Cascade Corp Clamping mechanism
DE2142650A1 (en) * 1971-08-25 1973-03-15 Bygg Och Transportekonomie Ab LIFTING TRUCK
US4127205A (en) * 1977-09-19 1978-11-28 Cascade Corporation Lift truck load clamp for handling paper rolls
DE8032810U1 (en) * 1980-12-10 1981-04-02 Eaton Ltd., Hounslow, Middlesex BETWEEN TWO IN THE ESSENTIAL SIGNAL OF A FORKLIFT OF A FORKLIFT HIGH-SLIDING LIFTING CARRIAGE
US4435119A (en) * 1981-11-16 1984-03-06 Cascade Corporation Lift truck load clamp having power-actuated pivotal subframe for handling paper rolls
US4435117A (en) * 1982-02-01 1984-03-06 Cascade Corporation Lift truck paper roll clamp having automatically adjustable roll of different diameters
US4516905A (en) * 1982-11-17 1985-05-14 Hoover Universal, Inc. Roll clamp

Also Published As

Publication number Publication date
EP0385242A2 (en) 1990-09-05
ES2047726T3 (en) 1994-03-01
EP0385242A3 (en) 1990-12-27
DE3905994C2 (en) 1994-09-29
DE3905994A1 (en) 1990-09-06

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