EP0866026A3 - Telescopic mast construction for a lift-truck - Google Patents

Telescopic mast construction for a lift-truck Download PDF

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Publication number
EP0866026A3
EP0866026A3 EP98100493A EP98100493A EP0866026A3 EP 0866026 A3 EP0866026 A3 EP 0866026A3 EP 98100493 A EP98100493 A EP 98100493A EP 98100493 A EP98100493 A EP 98100493A EP 0866026 A3 EP0866026 A3 EP 0866026A3
Authority
EP
European Patent Office
Prior art keywords
lifting cylinder
mast
movable mast
load carrying
carrying means
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.)
Withdrawn
Application number
EP98100493A
Other languages
German (de)
French (fr)
Other versions
EP0866026A2 (en
Inventor
Peter Dibbern
Thorsten Schrötke
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
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP0866026A2 publication Critical patent/EP0866026A2/en
Publication of EP0866026A3 publication Critical patent/EP0866026A3/en
Withdrawn legal-status Critical Current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
    • B66F9/08—Masts; Guides; Chains

Landscapes

  • 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)

Abstract

Ausfahrbare Mastkonstruktion (10) für einen Hubwagen mit einem wagenfesten Mast (12), einem beweglichen Mast (22), der relativ zum wagenfesten Mast (12) auf und ab bewegbar gelagert ist, einem Lasttragmittel (24), das am beweglichen Mast (22) auf und ab bewegbar gelagert ist, einem ersten Hubzylinder (26) (Freihubzylinder), der an einem Ende am beweglichen Mast (22) und am anderen Ende über Zugmittel (30) mit dem Lasttragmittel (24) gekoppelt ist, mindestens einem zweiten Hubzylinder (34,36) zum Ausfahren des bewegbaren Mastes (22), wobei die Hubzylinder (34,36) parallel an eine gemeinsame hydraulische Versorgung angeschlossen sind und in ihrem wirksamen Querschnitt so gewählt sind, daß der Freihubzylinder (26) das Lasttragmittel (24) anhebt, bevor der zweite Hubzylinder (34,36) den bewegbaren Mast (22) ausfährt, wobei der Freihubzylinder (26) so aufgebaut ist, daß vor dem Ende seines Ausfahrhubes ein allmählich ansteigender hydraulischer Gegendruck aufgebaut wird, der so bemessen ist, daß die dadurch verursachte Druckerhöhung an den Hubzylindern ausreicht, den zweiten Hubzylinder (34,36) auszufahren, bevor der Freihubzylinder (26) seinen Totpunkt erreicht hat.

Figure 00000001
Extendable mast construction (10) for a pallet truck with a carriage-fixed mast (12), a movable mast (22) which is movably mounted up and down relative to the carriage-fixed mast (12), a load carrying means (24) which is attached to the movable mast (22 ) is movably mounted up and down, a first lifting cylinder (26) (free lifting cylinder), which is coupled at one end to the movable mast (22) and at the other end via traction means (30) with the load carrying means (24), at least one second lifting cylinder (34, 36) for extending the movable mast (22), the lifting cylinders (34, 36) being connected in parallel to a common hydraulic supply and their effective cross-section selected so that the free lifting cylinder (26) is the load carrying means (24) lifts before the second lifting cylinder (34, 36) extends the movable mast (22), the free lifting cylinder (26) being constructed in such a way that a gradually increasing hydraulic counterpressure is built up before the end of its extending stroke, which is so dimensioned It is that the pressure increase on the lifting cylinders caused by this is sufficient to extend the second lifting cylinder (34, 36) before the free lifting cylinder (26) has reached its dead center.
Figure 00000001
EP98100493A 1997-03-14 1998-01-14 Telescopic mast construction for a lift-truck Withdrawn EP0866026A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19710556 1997-03-14
DE1997110556 DE19710556C2 (en) 1997-03-14 1997-03-14 Extendable mast construction for a pallet truck

Publications (2)

Publication Number Publication Date
EP0866026A2 EP0866026A2 (en) 1998-09-23
EP0866026A3 true EP0866026A3 (en) 2000-01-05

Family

ID=7823345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98100493A Withdrawn EP0866026A3 (en) 1997-03-14 1998-01-14 Telescopic mast construction for a lift-truck

Country Status (2)

Country Link
EP (1) EP0866026A3 (en)
DE (1) DE19710556C2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6557456B2 (en) 2001-05-24 2003-05-06 The Raymond Corporation Cushioned actuator
DE10343312B4 (en) * 2003-09-19 2005-12-01 Jungheinrich Ag Retractable mast construction for a pallet truck
SE529748C2 (en) 2004-05-03 2007-11-13 Toyota Ind Sweden Ab Device for forklift
US7240771B2 (en) * 2004-05-25 2007-07-10 The Raymond Corporation Mast staging hydraulic circuit
EP2123594A1 (en) * 2008-05-23 2009-11-25 BT Products AB Industrial lift truck with speed control
EP2210856B1 (en) * 2009-01-23 2012-03-07 BT Products AB A mast structure for an industrial lift truck
DE102009011865B4 (en) * 2009-03-05 2021-11-18 Jungheinrich Aktiengesellschaft Lifting device for an industrial truck
DE102011016542A1 (en) * 2011-04-08 2012-10-11 Jungheinrich Aktiengesellschaft Industrial truck, in particular reach truck with a mast

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3606515A1 (en) * 1985-02-28 1986-08-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi FLUID-ACTUATED PISTON CYLINDER UNIT WITH SHOCK ABSORBER
EP0622331A1 (en) * 1993-03-19 1994-11-02 FIAT OM CARRELLI ELEVATORI S.p.A. A lifting unit for the forks of lift trucks
EP0716040A1 (en) * 1994-11-28 1996-06-12 BT Industries Aktiebolag Free stroke damping

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264282B (en) * 1992-02-20 1995-04-12 Lansing Linde Ltd Lift trucks and extensible mast structures therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3606515A1 (en) * 1985-02-28 1986-08-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi FLUID-ACTUATED PISTON CYLINDER UNIT WITH SHOCK ABSORBER
EP0622331A1 (en) * 1993-03-19 1994-11-02 FIAT OM CARRELLI ELEVATORI S.p.A. A lifting unit for the forks of lift trucks
EP0716040A1 (en) * 1994-11-28 1996-06-12 BT Industries Aktiebolag Free stroke damping

Also Published As

Publication number Publication date
EP0866026A2 (en) 1998-09-23
DE19710556A1 (en) 1998-09-17
DE19710556C2 (en) 1999-03-11

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