SE9601184L - Device for trucks - Google Patents

Device for trucks

Info

Publication number
SE9601184L
SE9601184L SE9601184A SE9601184A SE9601184L SE 9601184 L SE9601184 L SE 9601184L SE 9601184 A SE9601184 A SE 9601184A SE 9601184 A SE9601184 A SE 9601184A SE 9601184 L SE9601184 L SE 9601184L
Authority
SE
Sweden
Prior art keywords
cylinder
motor
hydraulic
piston
voltage
Prior art date
Application number
SE9601184A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE510194C2 (en
SE9601184D0 (en
Inventor
Kurt-Ove Stenberg
Original Assignee
Bt Ind 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 Ind Ab filed Critical Bt Ind Ab
Priority to SE9601184A priority Critical patent/SE510194C2/en
Publication of SE9601184D0 publication Critical patent/SE9601184D0/en
Priority to EP19970850047 priority patent/EP0798260B1/en
Priority to DE69722298T priority patent/DE69722298T2/en
Priority to US08/828,357 priority patent/US5994650A/en
Publication of SE9601184L publication Critical patent/SE9601184L/en
Publication of SE510194C2 publication Critical patent/SE510194C2/en

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)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (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. <IMAGE>
SE9601184A 1996-03-28 1996-03-28 Device for trucks SE510194C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9601184A SE510194C2 (en) 1996-03-28 1996-03-28 Device for trucks
EP19970850047 EP0798260B1 (en) 1996-03-28 1997-03-26 Arrangement at fork-lift trucks
DE69722298T DE69722298T2 (en) 1996-03-28 1997-03-26 Arrangement on pallet trucks
US08/828,357 US5994650A (en) 1996-03-28 1997-03-28 Safety system for lift trucks

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9601184D0 SE9601184D0 (en) 1996-03-28
SE9601184L true SE9601184L (en) 1997-09-29
SE510194C2 SE510194C2 (en) 1999-04-26

Family

ID=20401978

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9601184A SE510194C2 (en) 1996-03-28 1996-03-28 Device for 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
EP2172359B1 (en) 2005-09-20 2012-12-19 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
EP2675745B1 (en) * 2011-02-16 2016-05-11 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

Family Cites Families (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
JPH0742056B2 (en) * 1989-06-15 1995-05-10 三菱電機株式会社 Fluid elevator controller
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
DE4306680C2 (en) * 1993-03-04 1995-02-16 Jungheinrich Ag Method for determining the lifting height of a height-adjustable load handling device of an industrial truck

Also Published As

Publication number Publication date
SE510194C2 (en) 1999-04-26
EP0798260A2 (en) 1997-10-01
DE69722298D1 (en) 2003-07-03
EP0798260B1 (en) 2003-05-28
EP0798260A3 (en) 1998-12-16
SE9601184D0 (en) 1996-03-28
DE69722298T2 (en) 2004-04-01

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Legal Events

Date Code Title Description
NUG Patent has lapsed