EP0574660B1 - Chariot élévateur - Google Patents

Chariot élévateur Download PDF

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Publication number
EP0574660B1
EP0574660B1 EP93104927A EP93104927A EP0574660B1 EP 0574660 B1 EP0574660 B1 EP 0574660B1 EP 93104927 A EP93104927 A EP 93104927A EP 93104927 A EP93104927 A EP 93104927A EP 0574660 B1 EP0574660 B1 EP 0574660B1
Authority
EP
European Patent Office
Prior art keywords
mast
inclination
lift truck
strut
adjustable
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
EP93104927A
Other languages
German (de)
English (en)
Other versions
EP0574660A1 (fr
Inventor
Matthias Dipl.-Ing. Schopf
Ernst Peter Dr. Ing. Magens
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.)
Jungheinrich AG
Original Assignee
Jungheinrich 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
Priority claimed from DE19934305639 external-priority patent/DE4305639C2/de
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP0574660A1 publication Critical patent/EP0574660A1/fr
Application granted granted Critical
Publication of EP0574660B1 publication Critical patent/EP0574660B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/24—Electrical devices or systems
    • 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
    • B66F9/08—Masts; Guides; Chains
    • B66F9/082—Masts; Guides; Chains inclinable

Definitions

  • the invention relates to a lift truck according to the preamble of patent claim 1 and patent claim 3.
  • Lift trucks have a mast that contains at least one mast. Often, however, at least two masts are provided, namely a mast attached to the vehicle and a mast or mast section movably guided on the mast, on which a load suspension device is then guided.
  • a mast of this type has become known from DE 30 41 910.
  • the load-carrying device can be a carriage guided on the mast section, to which a fork is fixedly attached.
  • so-called swivel push forks can also be used be used be used.
  • the slide has two horizontal, spaced-apart racks, on which a bearing component for the swivel fork can be moved.
  • the swivel fork can in turn be swiveled through 180 ° in the bearing component.
  • Such a swivel push fork has the advantage that both sides of the shelf can be operated by a stacking vehicle without having to change its position.
  • the axle assembly supports a gear unit for driving the front wheels of the lift truck and has two forks that stand forward and that accommodate rearward-facing brackets on the outer or standing mast.
  • Forks are attached to the mast at the top Linkage of hydraulic cylinders, which are guided under the overhead guard and articulated at the rear end of the canopy in the area of the support by vertical bars.
  • the mast With the help of the adjustment cylinders, the mast can be given a desired inclination.
  • the area below the articulation of the adjusting cylinders is hardly subjected to bending in the known construction.
  • the point of attack of the adjusting cylinders which is determined by the level of the overhead guard, is however still relatively low compared to the lifting heights that are to be provided in particular for lift trucks that are used for loading and unloading high racks.
  • the invention has for its object to provide a lift truck in which the load during the lifting and lowering movement despite the inherent elasticity of the mast, it is guided almost vertically to facilitate stacking and unstacking.
  • the standing mast is supported on a cross member which forms the wheel axle.
  • the cross member is preferably designed as a double-T profile, the supports of the standing mast extending to the lower web of the double-T profile when a recess is left in the region of the upper cross bar.
  • the cross member is articulated on the base frame about an axis parallel to the wheel axis.
  • the mast can thereby be pivoted relative to the base frame or vehicle, for example to change the inclination with a greater load or load height.
  • a variable-length support engages near the upper end on the standing mast and is articulated on the chassis of the vehicle at the other end. This is one created a broad basis for supporting the mast. A deflection can then essentially only take place in the area of the extended mast parts.
  • the actual deviation of the load movement from the perpendicular can be determined. This in turn can be used to determine control signals for the inclination regulation.
  • the mast deflection depends on the size of the load and its height.
  • the height of the load suspension device is determined in the invention according to claim 3 by known measuring devices.
  • the weight of the load can be determined from the pressure of the lifting cylinder.
  • An algorithm can be created from the height and pressure, by means of which the tilt of the mast can be calculated accordingly.
  • Certain combinations of lifting height and pressure can be assigned corresponding paths of the variable-length support or the inclination cylinder depending on the respective deformation properties of the mast. The permanent adjustment of the mast inclination enables an almost vertical load movement despite the mast deformation.
  • the load with the dead weight of the lifting frame stands directly on the ground, which results in a good introduction of force into the ground.
  • the articulation of the variable-length support enables a relatively light construction for the mast, which is otherwise to be made relatively rigid, which leads to a considerable weight impairing the transport capacity.
  • variable-length support stabilizes the mast and can be formed by one or more hydraulic cylinders.
  • other longitudinal drives are also possible.
  • the variable-length support is used to adjust the mast by small swivel angles, then an embodiment of the invention is advantageous, according to which the support engages on an approximately horizontally mounted eccentric shaft on the mast, which in turn can be rotated by an inclination cylinder. Since relatively small swivel angles for the mast are sufficient for the compensation for the bending of the mast, only a relatively small adjusting cylinder is necessary to bring about the swiveling via the eccentric shaft. This ensures that only a small part of the supporting forces have to be transmitted by the adjusting cylinder acting as an adjusting drive. This leads to a correspondingly rigid support of the mast.
  • a lift truck 10 according to FIGS. 1 and 2 has a vehicle 12 which comprises a chassis 14 and a protective roof 16 which is supported on the chassis 14 by a support device 18.
  • the chassis 14 includes, among other things, a driver's compartment and wheel arms, one of which can be seen at 22.
  • a drive wheel 24 can be seen on the chassis 14, while each wheel arm 22 has a load wheel 26.
  • the load wheels 26 are double-T-shaped at the ends of a cross-section Cross member 28 rotatably mounted.
  • the cross member 28 is mounted on the wheel arms 22 so as to be pivotable about an axis 30 parallel to the wheel axis.
  • the cross member 28 can be seen in FIG. 6.
  • two parallel plates 36 are welded in between the upper and lower transverse webs 32 and 34 (see also FIG. 3), which therefore form a fork into which a tapered section 38 of the wheel arm 22 projects and there about the axis of rotation 30 is rotatably supported, for example with the help of a pin 40.
  • the mast 42 of a mast 44 is supported on the lower crosspiece of the double-T profile.
  • the standing mast consists of two parallel-spaced, double-T-shaped supports 46.
  • two mast sections 48 and 50 are guided telescopically in the standing mast 42.
  • Two longitudinally adjustable supports are articulated at one end at 54 near the upper end of the standing mast 42 and at the other end at 56 at the lower end of the supports 18 for the canopy 16.
  • the mast 44 can be pivoted in the direction of the overhead guard 16, whereby a favorable transport position is achieved.
  • a load suspension device 58 is guided such that it can be adjusted in height. This will not be dealt with in detail since the state of the art is available.
  • a cross strut 60 is attached to the rear, to which an upwardly extending inclination cylinder 62 is articulated. Its rod 64 is articulated on a lever 66 which is connected to a shaft 68 which is rotatably mounted in tabs 70, 72 attached to the supports 46. Eccentric discs 74 and 76 are attached to the ends of the shaft 68 with eccentric pins 78 and 80, respectively.
  • the supports 52 are articulated to the pins 78, 80. If the tilt cylinder 62 is actuated, the shaft 68 is rotated and thereby changes the distance of the cross member 60 or the supports 46 from the supports 52. In this way, the inclination of the mast 44 can be adjusted.
  • Two exemplary embodiments are shown in FIGS. 7 and 8 for controlling or regulating the inclination of the lifting frame 44.
  • a height sensor (not shown) measures the height of the load-bearing means 58 on the lifting frame 44.
  • a pressure sensor measures the pressure in the lifting cylinder (not shown) for the height adjustment of the load-bearing means 58. Both signals are input into a block 90.
  • x f (h, p) a setpoint for the inclination of the mast 44 is calculated.
  • the tilt cylinder 62 is adjusted via a control 92 for the tilt cylinder 62, a displacement sensor measuring the adjustment of the tilt cylinder 62 and comparing it with the desired value, as shown at 94.
  • the inclination cylinder 62 adjusts the shaft 68 and thus the inclination of the mast 42, which ideally leads to a vertical movement of the load on the load suspension device 58.
  • a setpoint generator 96 is provided, which specifies the perpendicular guidance of the load.
  • the cylinder control 92 in turn actuates the tilt cylinder 62 and this the shaft 68, whereby the mast 42 is adjusted in an inclination.
  • a corresponding movement of the load-carrying means 58 occurs, with a solder laser 98 or the like being assigned to this, which determines whether the load is actually guided perpendicularly.
  • the deviation from the target value is determined in the comparison device 100, so that again a control signal for the cylinder control 92 can be determined.
  • height measurement and pressure measurement are eliminated.

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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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (9)

  1. Chariot élévateur, comportant un châssis entraîné, qui comprend un cadre de base et prend appui sur le sol au moyen de roues avant et arrière, une structure de levage, qui comporte un mât vertical et au moins une coulisse de mât, guidée de façon télescopique sur le mât vertical, le mât vertical comprenant deux montants latéraux parallèles et espacés ainsi que, éventuellement, au moins une traverse médiane disposée entre les montants latéraux et qui prend appui sur un support transversal, qui forme simultanément l'essieu pour les roues avant et est relié, à l'arrière, au châssis de base, au moins un étai de longueur variable articulé à proximité de l'extrémité supérieure du mât vertical et à l'autre extrémité au châssis du véhicule, ou un vérin d'inclinaison qui modifie l'inclinaison du mât vertical, un dispositif de régulation de l'inclinaison de la structure de levage (44) pour guider à la verticale le moyen (58) de réception de la charge, ce dispositif de régulation comportant un capteur associé à la structure de levage (44) ou au moyen (58) de réception de la charge et qui mesure l'écart du déplacement de la charge du moyen (58) de réception de la charge par rapport à la verticale, ainsi qu'un générateur de valeur de consigne (96) qui, à partir de l'écart mesuré, détermine une valeur de consigne pour fournir un signal de réglage pour l'étai de longueur variable (52) ou pour le vérin d'inclinaison (62).
  2. Chariot élévateur selon la revendication 1, caractérisé en ce qu'un laser faisant office de fil à plomb coopère avec le capteur.
  3. Chariot élévateur, comportant un châssis entraîné, qui comporte un cadre de base et prend appui sur le sol au moyen de roues avant et arrière, une structure de levage, qui comprend un mât vertical et au moins une coulisse de mât, guidée de façon télescopique sur le mât vertical, le mât vertical comportant deux montants latéraux parallèles et espacés ainsi qu'éventuellement au moins une traverse médiane disposée entre les montants latéraux et qui prend appui sur un support transversal, qui forme simultanément l'essieu pour les roues avant et est relié, à l'arrière, au châssis de base, au moins un étai de longueur variable, qui est articulé à proximité de l'extrémité supérieure au mât vertical et à l'autre extrémité au châssis du véhicule, ou un vérin d'inclinaison pour modifier l'inclinaison du mât vertical, un dispositif de régulation de l'inclinaison de la structure de levage (44) pour guider à la verticale le moyen (58) de réception de la charge et comportant un capteur de pression associé au vérin de levage de la structure de levage (44) et mesurant l'importance de la charge placée sur le moyen de réception de la charge, et un capteur de hauteur mesurant la hauteur du moyen (58) de réception de la charge, ainsi qu'un générateur de valeur de consigne (90) qui, à partir de la hauteur de levage et de la pression, détermine une valeur de consigne pour former un signal de réglage pour l'étai de longueur variable (52) ou pour le vérin d'inclinaison (62).
  4. Chariot élévateur selon l'une des revendications 1 à 3, caractérisé en ce que l'étai de longueur variable (52) est couplé à un arbre d'excentrique (68) monté approximativement horizontalement sur le mât vertical (42) et qu'un vérin d'inclinaison (62) peut faire tourner.
  5. Chariot élévateur selon l'une des revendications 1 à 4, caractérisé en ce que l'étai de longueur variable (52) est formé par un vérin hydraulique.
  6. Chariot élévateur selon l'une des revendications 1 à 5, caractérisé en ce que le vérin d'inclinaison (62) ou l'étai de longueur variable (52) est équipé d'un capteur de déplacement destiné à produire une valeur réelle devant être comparée à la valeur de consigne, et en ce que le signal de réglage est déterminé à partir de la différence entre la valeur de consigne et la valeur réelle.
  7. Chariot élévateur selon l'une des revendications 1 à 6, caractérisé par un agencement de l'articulation du support transversal (28) et de l'étai de longueur variable (52) de telle sorte que la structure de levage (44) est rabattable contre le toit (16) de protection du conducteur du véhicule (12).
  8. Chariot élévateur selon l'une des revendications 1 à 7, caractérisé en ce que le support transversal (28) est articulé, au niveau d'un axe (30) parallèle à l'axe de roue, sur le châssis de base (22).
  9. Chariot élévateur selon l'une des revendications 1 à 8, caractérisé en ce que le support transversal (28) est un profilé en T double.
EP93104927A 1992-06-19 1993-03-25 Chariot élévateur Expired - Lifetime EP0574660B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4220009 1992-06-19
DE4220009 1992-06-19
DE4305639 1993-02-24
DE19934305639 DE4305639C2 (de) 1993-02-24 1993-02-24 Hublader

Publications (2)

Publication Number Publication Date
EP0574660A1 EP0574660A1 (fr) 1993-12-22
EP0574660B1 true EP0574660B1 (fr) 1997-05-14

Family

ID=25915836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104927A Expired - Lifetime EP0574660B1 (fr) 1992-06-19 1993-03-25 Chariot élévateur

Country Status (2)

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EP (1) EP0574660B1 (fr)
DE (1) DE59306429D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107381446B (zh) * 2016-05-16 2023-06-30 闫勇刚 一种便携式装运车

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2261930A (en) * 1940-03-14 1941-11-11 Elwell Parker Electric Co Load elevating mechanism for industrial trucks
US2349353A (en) * 1943-02-10 1944-05-23 Willamette Hyster Company Industrial truck
US2723771A (en) * 1952-08-13 1955-11-15 Taylor Machine Works Fork lift truck
DE1047719B (de) * 1956-02-11 1958-12-24 Hans Still Ag Fahrbares Stapelgeraet mit rueckwaerts neigbarem Hubmast
US2905348A (en) * 1957-05-23 1959-09-22 Clark Equipment Co Industrial truck
FR1392044A (fr) * 1964-02-19 1965-03-12 Rubery Elévateur-gerbeur mobile
FR1404252A (fr) * 1964-08-13 1965-06-25 Yale & Towne Chariot de manutention à montants inclinables
FR1449300A (fr) * 1965-10-05 1966-08-12 Hans Still Ag Appareil élévateur gerbeur mobile à charpente de levage inclinable
AU8652275A (en) * 1974-11-11 1977-05-19 Hill L D Fork lift truck
WO1982002188A1 (fr) * 1980-12-19 1982-07-08 Ervin Daniel L Mat de levage avec montages de cylindre d'inclinaison decales
JPS57159100U (fr) * 1981-03-31 1982-10-06
DE4038730A1 (de) * 1990-12-05 1992-06-11 Jungheinrich Ag Hubgeruest, insbesondere fuer hubfahrzeuge

Also Published As

Publication number Publication date
EP0574660A1 (fr) 1993-12-22
DE59306429D1 (de) 1997-06-19

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