EP4023588A1 - Procédé de fonctionnement d'un dispositif de levage d'un chariot de manutention et dispositif de levage - Google Patents

Procédé de fonctionnement d'un dispositif de levage d'un chariot de manutention et dispositif de levage Download PDF

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Publication number
EP4023588A1
EP4023588A1 EP21212428.3A EP21212428A EP4023588A1 EP 4023588 A1 EP4023588 A1 EP 4023588A1 EP 21212428 A EP21212428 A EP 21212428A EP 4023588 A1 EP4023588 A1 EP 4023588A1
Authority
EP
European Patent Office
Prior art keywords
movements
impermissible
lifting
lifting device
movement zone
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.)
Pending
Application number
EP21212428.3A
Other languages
German (de)
English (en)
Inventor
Jörg Lange
Steffen Homann
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.)
STILL GmbH
Original Assignee
STILL GmbH
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 STILL GmbH filed Critical STILL GmbH
Publication of EP4023588A1 publication Critical patent/EP4023588A1/fr
Pending 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
    • B66F9/22—Hydraulic 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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • 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
    • B66F9/0755—Position control; Position detectors
    • 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
    • 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

Definitions

  • the invention relates to a method for operating a lifting device of an industrial truck with a load handling device arranged on a lifting frame such that it can be raised and lowered, as well as a lifting device for carrying out the method.
  • a load handling device which is formed by a lifting carriage that can be raised and lowered on the lifting frame and an attachment attached thereto.
  • a load fork consisting of forks can be used as an attachment, by means of which a load, for example a pallet, can be driven under.
  • a clamping device for example a bale or roll clamp, can also be used as an attachment, with which a load is held by lateral clamping.
  • a flexible traction device is attached to the lifting carriage for raising and lowering the load handling device, for example a lifting chain, which is attached to the lifting carriage at a first end, is guided over a deflection roller and is attached to the mast at a second end.
  • the flexible traction device is actuated by a lifting device.
  • the lifting device can be designed, for example, as a lifting cylinder device, which generally includes one or more lifting cylinders, each with a retracting and extending, single-stage or multi-stage piston rod.
  • Such operating situations can occur, for example, when setting down a load using a load handling device designed as a load fork on a shelf of a shelf, if the forks of the load fork rest on the shelf when the load is set down in the shelf with a further retracted lifting cylinder device and the traction device is therefore loose and the tension loses. As soon as the fork tines are free again when they are pulled out of the shelf compartment, an undesired abrupt lowering movement of the load fork occurs until the traction mechanism is tensioned again.
  • Another operating situation of this type occurs when, when lowering a load using a load handling device designed as a clamping device, the load held by the clamping device rests on the floor or in a shelf and touches the floor or the shelf. If the lowering movement of the lifting cylinder device is actuated further, the clamping device is held in position by the load, so that the traction mechanism connected to the lifting carriage becomes loose due to the further retraction movement of the piston rod of the lifting cylinder device and loses its tension. If the clamping device is then opened, the clamping device fastened to the lifting carriage lowers abruptly until the traction mechanism is tensioned again. This can damage the load and overload the traction mechanism.
  • This hydraulic load protection function consists of a pressure cut-off valve as a mechanical check valve, which is arranged in a pressure medium line between the control valve device and the lifting cylinder device parallel to a locking valve opening in the direction of the lifting cylinder device.
  • the pressure cut-off valve is acted upon by a spring in the direction of a blocking position and the pressure present in the pressure medium line in the direction of a flow position.
  • the pressure cut-off valve is actuated to the blocking position and the pressure medium line is shut off, so that the lowering movement and thus the lowering process of the load-carrying device abruptly stops.
  • the aim of this hydraulic load protection function is to prevent the traction mechanism from becoming loose when a load is set down on a set-down area with a heavy attachment.
  • a lifting device with such a pressure cut-off valve in the pressure medium line, in order to keep the traction means under tension, is shown in FIG U.S. 4,955,461 A1 known.
  • the pressure threshold of the pressure cut-off valve which is mechanically predetermined and set by the spring, corresponds to the pressure in the pressure medium line that occurs when the load handling device is unloaded.
  • such a pressure cut-off valve can be used to prevent the clamped rolls of paper from being destroyed when the roll of paper is set down on a set-down area.
  • this load protection function can only be implemented with the pressure cut-off valve if a sufficiently heavy attachment for load handling is available as the load handling device, which generates a sufficiently high pressure in the pressure medium line when raised, for example if the weight of the attachment is greater than 500 kg, and if the When the load is dropped, it is clamped and the load is thus fixed by clips, so that a pressure of almost 0 bar is created in the pressure medium line when the load is placed on the setting surface. Because the attachment must generate a sufficiently high pressure to set the pressure threshold of the pressure cut-off valve far away from the pressure that occurs when the lifting device is raised without an attachment, i.e. the pressure when raising the liftable mast parts of the lifting frame, to also lower the attachment at low temperatures with a response of the pressure cut-off valve combined with an abrupt lowering stop during operation.
  • a lifting device of an industrial truck in which the load protection function described above, which prevents the traction mechanism from becoming loose when a load is set down on a set-down surface, is achieved electronically.
  • the pressure in the pressure medium line between the control valve device and the lifting cylinder device is detected by a pressure sensor and when the load handling device is lowered, the control valve device is actuated into a blocked position in order to end the lowering process when the pressure in the pressure medium line reaches a pressure limit value falls below
  • the pressure limit is slightly below the pressure that corresponds to the empty load handling device with no load lifted.
  • the pressure limit value is thus selected in such a way that it is slightly below the pressure that occurs when the load-receiving means is lowered without a load.
  • the retraction movement of the lifting cylinder device is ended by corresponding actuation of the control valve device into the blocking position and the traction means is prevented from becoming loose as soon as the load handling device or a load clamped with the load handling device is resting on a setting surface and the load handling device is on its own Lowering movement finished.
  • the readjustment of the height of the load handling device leads to a complex operating sequence for the operator when setting down a load on a setting down area or the grinding of the load handling device on the setting down area when driving away from the setting down area to a corresponding wear of the load handling device.
  • a further impairment of the functionality of the lifting device can be caused by the occurrence of vertical vibrations.
  • the load-carrying device can be made to oscillate during lowering or lifting, which makes it difficult to position the load-carrying device precisely and also increases the mechanical load and thus the wear on the lifting device.
  • From the DE 10 2018 119 222 A1 discloses a method for operating a lifting device of an industrial truck with a load-carrying device that can be raised and lowered on a lifting frame, with target operating conditions for lifting and lowering the load-carrying device being specified in an electronic control device.
  • the specified target operating conditions in the electronic control device be compared with the actual operating conditions of lifting and lowering detected by a sensor device and upon detection of a deviation of an actual operating condition from a target operating condition in which the actual operating condition can be changed by means of the control device, the actual operating condition is adapted to the target operating condition by changing it by means of the control device and upon detection of a deviation of the actual operating condition from the target operating condition, in which the actual operating condition cannot be changed by means of the control device is, the setpoint operating condition is adapted to the actual operating condition by changing it using the control device and/or a warning message is issued.
  • the present invention is based on the object of designing a method of the type mentioned at the outset and a lifting device for carrying out the method in such a way that the correct functionality of the lifting device can be ensured or at least impairments of the functionality can be detected at an early stage.
  • this object is achieved according to the invention in that permissible movements and impermissible movements of the lifting device are specified and the movements of the lifting device are detected by means of at least one sensor device and evaluated in an electronic control device, the electronic control device stopping the movements of the lifting device and/or outputting a warning message when impermissible movements are detected.
  • a particularly expedient embodiment of the invention provides that at least one permissible movement zone and at least one impermissible movement zone of the lifting device are specified and the electronic control device stops the movements of the lifting device and/or issues a warning message when movements are detected in the impermissible movement zone.
  • the method according to the invention can be used to prevent the further lowering of the mast after the load-receiving means has been placed, for example, on a shelf or on another obstructive object.
  • a detection of impermissible reaching of the impermissible movement zone by movements other than lowering the load handling device is also made possible with the method according to the invention.
  • a movement of the mast outside of normal use can be sensed with the sensor device that is present on the industrial truck or that is to be additionally attached.
  • the permissible movement zone and the impermissible movement zone are specified along a height alignment of the lifting frame.
  • the movements of the lifting device are preferably detected by sensing relative movements between the lifting frame and the load-carrying means by means of the sensor device and evaluated in the electronic control device.
  • the electronic control device stops the lowering of the load handling device and/or issues a warning message when it detects relative movements between the lifting frame and the load handling device in the impermissible movement zone.
  • the impermissible movement zone is advantageously provided above the permissible movement zone.
  • a sensor device provided in the area of the impermissible movement zone is advantageously used as a sensor device, which senses the entry of the load handling device into the impermissible movement zone during an upward movement of the load handling device relative to the mast.
  • a preferred embodiment of the invention provides that the impermissible movements of the lifting device are detected by sensing impermissible relative movements between mast segments of the mast, for example between two extension masts of the mast or between an extension mast and a vertical mast of the mast, using the sensor device.
  • the impermissible movements of the lifting device are detected by sensing a relaxation of flexible traction means of the lifting device, for example lifting chains, using the sensor device.
  • Another possibility is that the impermissible movements of the lifting device are detected by sensing a relaxation of hoses, in particular hydraulic hoses, of the lifting device using the sensor device.
  • the impermissible movements of the lifting device can also be detected by sensing a relaxation of cables, in particular electric cables, of the lifting device using the sensor device.
  • the electronic control device restricts vehicle functions of the industrial truck, in particular travel drive functions, in particular limits speeds of the vehicle functions or stops the vehicle functions when impermissible movements are detected.
  • the industrial truck can be prevented from starting up if the load handling device is still resting on the shelf.
  • an existing movable load-carrying device can also be classified, for example a tilting drive of the load-carrying device, with a tilt angle of 4-7 degrees being technically possible, but a permissible range is -2 to +4 degrees.
  • the invention also relates to a lifting device of an industrial truck for carrying out the method with a load handling device which is arranged on a lifting frame so that it can be raised and lowered.
  • the stated object is achieved in that at least one sensor device is provided which is designed to detect permissible movements and impermissible movements of the lifting device, the sensor device being operatively connected to an electronic control device which is designed to transmit the sensor data evaluate and stop the movements of the lifting device and/or issue a warning message if impermissible movements are detected.
  • a sensor device with a signal of 0 or 1 can be sufficient for this purpose in order to detect permissible movements and impermissible movements of the lifting device.
  • Electronic images of the permissible and impermissible movements of the lifting device are advantageously stored in the control device.
  • the control device is preferably set up to compare the movements of the lifting device detected by the sensor device with the stored electronic images and to stop the movements of the lifting device and/or to issue a warning message if impermissible movements are detected.
  • the electronic images can be corresponding characteristic diagrams.
  • a particularly expedient embodiment of the invention provides that at least one permissible movement zone and at least one impermissible movement zone of the lifting device are provided, and the electronic control device is set up to stop the movements of the lifting device when movements are detected in the impermissible movement zone and/or a to issue a warning message.
  • the sensor device is preferably designed as an optical sensor device, in particular as a laser sensor or camera.
  • the sensor device is designed as a touch sensor or as a non-contact sensor.
  • the touch sensor can be arranged, for example, on an upper stop of the mast. During an upward movement of the load handling device relative to the mast, the load handling device touches the touch sensor, so that an impermissible movement can be detected.
  • the permissible movement zone and the impermissible movement zone are expediently provided along a height alignment of the mast, with the impermissible movement zone being arranged above the permissible movement zone.
  • the sensor device is preferably arranged in the area of the impermissible movement zone on the mast and is designed to detect entry of the load handling device into the impermissible movement zone during an upward movement of the load handling device relative to the mast.
  • the invention offers a whole range of advantages: If an industrial truck is equipped with the function described in the invention, it is no longer possible to put the industrial truck in an impermissible and dangerous state with the load handling device placed on it.
  • the invention can be used in all industrial trucks with masts.
  • the lifting device 1 consists of a mast 2 on which, for handling a load Q, a lifting device 3 is arranged such that it can be raised and lowered.
  • the load handling device 3 consists of a lifting carriage 4 that can be moved vertically in the mast 2 and to which, for example, a load fork 5 formed by forks is attached as an attachment.
  • the mast 2 has a vertical mast 2a and an extension mast 2b, which can be raised and lowered on the vertical mast 2a.
  • the load handling device 3 can be raised and lowered on the extension mast 2b.
  • a hydraulic lifting cylinder device 11 is provided for raising and lowering the load handling device 3 .
  • the lifting cylinder device 11 has a cylinder housing which is arranged on the stationary mast 2a and an extendable piston rod 10 which is connected to the extending mast 2b.
  • a flexible traction device 6, for example a lifting chain, is provided for raising and lowering the load handling device 3.
  • the flexible traction means 6 has a first end on which Lifting carriage 4 attached.
  • the traction mechanism 6 is guided over a deflection roller 7 and is fastened with a second end to the vertical mast 2a of the mast 2 .
  • the deflection roller 7 is arranged on the extension mast 2b.
  • the lifting cylinder device 11 can be actuated by means of a control valve device 12 for raising and lowering the load-receiving means 3 .
  • the control valve device 12 is designed as a control valve 13 which throttles in intermediate positions and has a blocking position 13a designed as a neutral position, a lifting position 13b and a lowering position 13c.
  • the control valve 13 is connected to a feed line 14 of a pump 15 , a tank line 17 leading to a tank 16 and a pressure medium line 18 leading to the lifting cylinder device 11 .
  • the blocking position 13a of the control valve device 12 the connection between the pressure medium line 18 and the delivery line 14 and the container line 17 is blocked.
  • the delivery line 14 is connected to the pressure medium line 18.
  • the pressure medium line 18 is connected to the container line 17.
  • the control valve device 12 can be actuated electrically in the exemplary embodiment shown.
  • an electrical actuation device 20 is provided, which, when actuated, actuates the control valve device 12 in the direction of the lowering position 13c.
  • the control valve device 12 can be actuated in the direction of the lifting position 13b by means of a further electrical actuating device 21 .
  • the actuating devices 20, 21 are designed, for example, as magnets, in particular proportional magnets.
  • control valve device 12 is actuated in the non-actuated and de-energized state into the blocking position 13a, which is designed as a neutral position.
  • the electronic control device 25 is connected on the input side to a control element 28 that can be actuated by an operator, for example a joystick, which can be actuated to initiate a lifting process or a lowering process of the load handling device 3 and which can be actuated to set a lifting speed in lifting mode and a speed in lowering mode Lowering speed can be specified.
  • a control element 28 can be actuated by an operator, for example a joystick, which can be actuated to initiate a lifting process or a lowering process of the load handling device 3 and which can be actuated to set a lifting speed in lifting mode and a speed in lowering mode Lowering speed can be specified.
  • a lift measuring device 30 can be provided, which is connected to the electronic control device 25 .
  • the lift measuring device 30 is designed as a lift height sensor 31 with which the lift height of the load handling device 3 can be measured.
  • lift height sensor 31 is embodied, for example, as a cable length sensor 32, which has a housing attached to lifting frame 2, for example a non-liftable stationary mast of the industrial truck attached to the vehicle body of the industrial truck, or a vehicle body of the industrial truck, and a cable means 33 connected to load handling device 3 includes.
  • the operability of the lifting device 1 is to be maintained or at least to be warned of an impending loss of operability.
  • the loosening of the traction device 6 slack chain formation
  • the touching down of the load handling device 3 on the ground load fork wear
  • the leakage of the hydraulic system lowering of the load handling device 3
  • the problem of vertical vibrations vibration loads
  • a permissible movement zone Z0 and an impermissible movement zone Z1 of the lifting device 1 are specified according to the invention.
  • the permissible movement zone Z0 is provided in the lower area and the impermissible movement zone Z1 is provided in the upper area of the extension mast 2b.
  • the movements of the lifting device 1, in particular the relative movements of the load handling device 3, for example the lifting carriage 4, relative to the extension mast 2b are detected by a sensor device S.
  • the sensor device S is arranged on the extension mast 2b and can be designed as an optical sensor device S, in particular as a laser sensor or camera. In the simplest case, the sensor device S can also be designed as a contact sensor or as a contactless sensor.
  • the sensor signals from the sensor device S are evaluated in the electronic control device 25 . If movements of the load handling device 3 are detected in the impermissible movement zone Z1, the electronic control device 25 issues a control command to the control valve device 12 or to an additional electrically controlled shut-off valve (not shown in detail), the movements of the lifting device 1, in particular the further retraction of the extension mast 2b and thus the further lowering of the load handling device 3 to stop. At the same time, a warning message can also be output via a display device that is not shown in the figures.
  • the lifting device 1 is shown with the mast 2 extended.
  • the piston rod 10 of the lifting cylinder device 11, which is connected to the extension mast 2b, is extended, so that the load handling device 3 is lifted by means of the flexible traction device 6 guided over the deflection roller 7.
  • the load handling device 3 is in the permissible movement zone Z0.
  • the lifting device 1 is shown with the mast 2 retracted.
  • the load handling device 3 rests on an obstruction R, for example a shelf.
  • R for example a shelf.
  • the still extended state of the extending mast 2b is shown in dashed lines.
  • the retracted state of the extending mast 2b is in the figure 2 shown with solid lines.
  • the permissible movement zone Z0 and the impermissible movement zone Z1 are provided on the extension mast 2b.
  • the load-carrying means 3 moves upward relative to the extension mast 2b as the extension mast 2b or the lifting cylinder device is retracted further.
  • the load handling device 3 passes from the permissible movement zone Z0 into the impermissible movement zone Z1.
  • the sensor device S detects the entry of the load handling device 2 into the impermissible movement zone Z1.
  • the sensor signals of the sensor device S are evaluated in the control device 25 .
  • the control device 25 then issues a control command to the control valve device 12 or to an additional, electrically controlled check valve (not shown) to stop the retraction of the extending mast 2b.
  • another lifting device for example an electric lifting device, can also be provided for raising and lowering the load handling device 3.
  • the lifting device can actuate the load handling device 3 by means of the traction device or alternatively directly.
  • control valve device 12 can be actuated mechanically, for example by means of a hand lever, in which case a check valve can be provided which is electrically controlled by the control device 25 and with which the further retraction of the extension mast 2b can be stopped when the load handling device 2 enters the impermissible movement zone Z1.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP21212428.3A 2020-12-28 2021-12-06 Procédé de fonctionnement d'un dispositif de levage d'un chariot de manutention et dispositif de levage Pending EP4023588A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020134959.9A DE102020134959A1 (de) 2020-12-28 2020-12-28 Verfahren zum Betrieb einer Hubvorrichtung eines Flurförderzeugs und Hubvorrichtung

Publications (1)

Publication Number Publication Date
EP4023588A1 true EP4023588A1 (fr) 2022-07-06

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Application Number Title Priority Date Filing Date
EP21212428.3A Pending EP4023588A1 (fr) 2020-12-28 2021-12-06 Procédé de fonctionnement d'un dispositif de levage d'un chariot de manutention et dispositif de levage

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EP (1) EP4023588A1 (fr)
DE (1) DE102020134959A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224529A (en) * 1963-05-23 1965-12-21 Shepard Co Lewis Power safety device for carriage controlled material handling trucks
JPS63202599A (ja) * 1987-02-04 1988-08-22 カスケード・コーポレーション 積荷搬送車両用積荷昇降マスト
US4955461A (en) 1988-10-31 1990-09-11 Vickers, Incorporated Valve system for preventing uncontrolled descent in fork lift trucks
US20120275892A1 (en) * 2011-04-29 2012-11-01 Jungheinrich Aktiengesellschaft Industrial truck with a height-adjustable load support
DE102012101734A1 (de) 2012-03-01 2013-09-05 Linde Material Handling Gmbh Hubvorrichtung eines Flurförderzeugs und Verfahren zum Betrieb einer Hubvorrichtung
EP2636637A1 (fr) * 2012-03-08 2013-09-11 Linde Material Handling GmbH Dispositif de levage d'un chariot de manutention
DE102018119222A1 (de) 2018-08-07 2020-02-13 Linde Material Handling Gmbh Hubvorrichtung eines Flurförderzeugs und Verfahren zum Betrieb der Hubvorrichtung
US20200262690A1 (en) * 2019-02-19 2020-08-20 Crown Equipment Corporation Chain slack detection system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224529A (en) * 1963-05-23 1965-12-21 Shepard Co Lewis Power safety device for carriage controlled material handling trucks
JPS63202599A (ja) * 1987-02-04 1988-08-22 カスケード・コーポレーション 積荷搬送車両用積荷昇降マスト
US4955461A (en) 1988-10-31 1990-09-11 Vickers, Incorporated Valve system for preventing uncontrolled descent in fork lift trucks
US20120275892A1 (en) * 2011-04-29 2012-11-01 Jungheinrich Aktiengesellschaft Industrial truck with a height-adjustable load support
DE102012101734A1 (de) 2012-03-01 2013-09-05 Linde Material Handling Gmbh Hubvorrichtung eines Flurförderzeugs und Verfahren zum Betrieb einer Hubvorrichtung
EP2636637A1 (fr) * 2012-03-08 2013-09-11 Linde Material Handling GmbH Dispositif de levage d'un chariot de manutention
DE102018119222A1 (de) 2018-08-07 2020-02-13 Linde Material Handling Gmbh Hubvorrichtung eines Flurförderzeugs und Verfahren zum Betrieb der Hubvorrichtung
US20200262690A1 (en) * 2019-02-19 2020-08-20 Crown Equipment Corporation Chain slack detection system

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