EP0798260A3 - Arrangement at fork-lift trucks - Google Patents

Arrangement at fork-lift trucks Download PDF

Info

Publication number
EP0798260A3
EP0798260A3 EP97850047A EP97850047A EP0798260A3 EP 0798260 A3 EP0798260 A3 EP 0798260A3 EP 97850047 A EP97850047 A EP 97850047A EP 97850047 A EP97850047 A EP 97850047A EP 0798260 A3 EP0798260 A3 EP 0798260A3
Authority
EP
European Patent Office
Prior art keywords
cylinder
motor
fork
arrangement
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97850047A
Other languages
German (de)
French (fr)
Other versions
EP0798260A2 (en
EP0798260B1 (en
Inventor
Kurt-Ove Stenberg
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.)
BT Industries AB
Original Assignee
BT Industries AB
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 BT Industries AB filed Critical BT Industries AB
Publication of EP0798260A2 publication Critical patent/EP0798260A2/en
Publication of EP0798260A3 publication Critical patent/EP0798260A3/en
Application granted granted Critical
Publication of EP0798260B1 publication Critical patent/EP0798260B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • B66F9/122—Platforms; Forks; Other load supporting or gripping members longitudinally movable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2838—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT with out using position sensors, e.g. by volume flow measurement or pump speed

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

At motor driven trucks where the load forks may reach forwards in relation to the truck this is done by means of a hydraulic cylinder (2). The volume of hydraulic oil fed to this cylinder is measured (7) via the voltage of an electric motor driving the hydraulic pump (1), the motor may in particular be a DC motor. By then integrating the voltage over the time a measure is obtained corresponding to the oil volume delivered to or drawn from the cylinder and corresponds in turn to the piston position. The position measurement is then used for speed ramping at the end of stroke of the piston so that shock free movement stops can be obtained.
EP19970850047 1996-03-28 1997-03-26 Arrangement at fork-lift trucks Expired - Lifetime EP0798260B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601184 1996-03-28
SE9601184A SE510194C2 (en) 1996-03-28 1996-03-28 Device for trucks

Publications (3)

Publication Number Publication Date
EP0798260A2 EP0798260A2 (en) 1997-10-01
EP0798260A3 true EP0798260A3 (en) 1998-12-16
EP0798260B1 EP0798260B1 (en) 2003-05-28

Family

ID=20401978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970850047 Expired - Lifetime EP0798260B1 (en) 1996-03-28 1997-03-26 Arrangement at fork-lift trucks

Country Status (3)

Country Link
EP (1) EP0798260B1 (en)
DE (1) DE69722298T2 (en)
SE (1) SE510194C2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952591B4 (en) * 1999-11-02 2004-07-15 Conti Temic Microelectronic Gmbh hydraulic system
DE602005019047D1 (en) 2005-09-20 2010-03-11 Atlet Ab Improved control system for an industrial truck
DE102007051042B4 (en) 2007-10-25 2023-01-26 Jungheinrich Aktiengesellschaft Method for sensing the end stop of a hydraulic lifting cylinder in an industrial truck
WO2012112431A1 (en) 2011-02-16 2012-08-23 Crown Equipment Corporation Materials handling vehicle estimating a speed of a movable assembly from a lift motor speed
FR2975089B1 (en) * 2011-05-10 2013-04-26 Manitou Bf TELESCOPIC HANDLING ARRAY MEASURING DEVICE
DE102021132437A1 (en) 2021-12-09 2023-06-15 Jungheinrich Aktiengesellschaft Method for operating an industrial truck

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675803A (en) * 1970-04-06 1972-07-11 Cascade Corp Load-handling apparatus with reach mechanism
US5131507A (en) * 1989-06-15 1992-07-21 Mitsubishi Denki Kabushiki Kaisha Hydraulic elevator control apparatus using VVVF to determine the electric drive motor rotational speed
DE4220333A1 (en) * 1992-06-22 1993-12-23 Marco Systemanalyse Entw Measuring piston displacement in hydraulic working cylinder - determining flow of hydraulic medium through cylinder from pressure difference measurement across choke
DE4306680A1 (en) * 1993-03-04 1994-09-08 Jungheinrich Ag Method of determining the lifting height of a vertically adjustable load-suspension means of an industrial truck

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675803A (en) * 1970-04-06 1972-07-11 Cascade Corp Load-handling apparatus with reach mechanism
US5131507A (en) * 1989-06-15 1992-07-21 Mitsubishi Denki Kabushiki Kaisha Hydraulic elevator control apparatus using VVVF to determine the electric drive motor rotational speed
DE4220333A1 (en) * 1992-06-22 1993-12-23 Marco Systemanalyse Entw Measuring piston displacement in hydraulic working cylinder - determining flow of hydraulic medium through cylinder from pressure difference measurement across choke
DE4306680A1 (en) * 1993-03-04 1994-09-08 Jungheinrich Ag Method of determining the lifting height of a vertically adjustable load-suspension means of an industrial truck

Also Published As

Publication number Publication date
EP0798260A2 (en) 1997-10-01
SE510194C2 (en) 1999-04-26
EP0798260B1 (en) 2003-05-28
DE69722298T2 (en) 2004-04-01
SE9601184D0 (en) 1996-03-28
DE69722298D1 (en) 2003-07-03
SE9601184L (en) 1997-09-29

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