EP1260478A3 - Hydraulic arrangement for the lift cylinder of an industrial truck - Google Patents

Hydraulic arrangement for the lift cylinder of an industrial truck Download PDF

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Publication number
EP1260478A3
EP1260478A3 EP02010826A EP02010826A EP1260478A3 EP 1260478 A3 EP1260478 A3 EP 1260478A3 EP 02010826 A EP02010826 A EP 02010826A EP 02010826 A EP02010826 A EP 02010826A EP 1260478 A3 EP1260478 A3 EP 1260478A3
Authority
EP
European Patent Office
Prior art keywords
cylinder
secondary cylinder
check valve
lifting
hydraulic arrangement
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
EP02010826A
Other languages
German (de)
French (fr)
Other versions
EP1260478A2 (en
EP1260478B1 (en
Inventor
Peter Schönewald
Heinz Gaffke
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 EP1260478A2 publication Critical patent/EP1260478A2/en
Publication of EP1260478A3 publication Critical patent/EP1260478A3/en
Application granted granted Critical
Publication of EP1260478B1 publication Critical patent/EP1260478B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Abstract

Die Erfindung betrifft eine hydraulische Anordnung für mindestens zwei, an eine gemeinsame Druckmittelversorgung angeschlossene Hubzylinder eines Flurförderzeugs. Einer der Hubzylinder ist als zuerst ausfahrender Primärzylinder (4) vorgesehen und weist einen größeren Kolbendurchmesser auf als der zweite Hubzylinder, der als nachfolgend ausfahrender Sekundärzylinder (2 bzw. 3) vorgesehen ist. Um sicherzustellen, dass die Ausfahrfolge der Hubzylinder auch unter ungüntigen Umständen eingehalten wird, ist erfindungsgemäß dem Sekundärzylinder (3) ein druckabhängig öffnendes Sperrventil (5) vorgeschaltet. Der Primärzylinder (4) ist gemäß einer ersten Ausgestaltung der Erfindung dem Sekundärzylinder (2) nachgeschaltet. Es ist dabei ein zu dem Sekundärzylinder (2) parallel geschalteter zweiter Sekundärzylinder (3) vorgesehen ist, wobei das Sperrventil (5) dem zweiten Sekundärzylinder (3) vorgeschaltet ist. Es ist auch möglich, dass der Primärzylinder (4) parallel zum Sekundärzylinder (3) geschaltet ist. Das Sperrventil (5) ist bevorzugt in den Sekundärzylinder integriert.

Figure 00000001
The invention relates to a hydraulic arrangement for at least two, connected to a common pressure medium supply lifting cylinder of a truck. One of the lifting cylinders is provided as a first extending primary cylinder (4) and has a larger piston diameter than the second lifting cylinder, which is provided as subsequently extending secondary cylinder (2 or 3). In order to ensure that the extension sequence of the lifting cylinder is maintained even under unfavorable circumstances, according to the invention, a pressure-dependent opening check valve (5) is connected upstream of the secondary cylinder (3). The primary cylinder (4) is connected downstream of the secondary cylinder (2) according to a first embodiment of the invention. In this case, a second secondary cylinder (3) connected in parallel with the secondary cylinder (2) is provided, the check valve (5) being connected upstream of the second secondary cylinder (3). It is also possible that the primary cylinder (4) is connected in parallel to the secondary cylinder (3). The check valve (5) is preferably integrated in the secondary cylinder.
Figure 00000001
EP20020010826 2001-05-23 2002-05-15 Hydraulic arrangement for the lift cylinder of an industrial truck Expired - Fee Related EP1260478B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001125351 DE10125351A1 (en) 2001-05-23 2001-05-23 Hydraulic arrangement for the lifting cylinders of an industrial truck
DE10125351 2001-05-23

Publications (3)

Publication Number Publication Date
EP1260478A2 EP1260478A2 (en) 2002-11-27
EP1260478A3 true EP1260478A3 (en) 2005-04-20
EP1260478B1 EP1260478B1 (en) 2008-09-17

Family

ID=7685999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020010826 Expired - Fee Related EP1260478B1 (en) 2001-05-23 2002-05-15 Hydraulic arrangement for the lift cylinder of an industrial truck

Country Status (2)

Country Link
EP (1) EP1260478B1 (en)
DE (2) DE10125351A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10349123A1 (en) * 2003-10-22 2005-05-19 Still Wagner Gmbh & Co Kg Hoist, especially for a high rack forklift
DE102005052116B4 (en) 2005-11-02 2017-10-26 Linde Material Handling Gmbh Device for securing the sequence of movements of at least two fluid-operated displacement units
DE102006003660B4 (en) * 2006-01-26 2016-02-18 Linde Material Handling Gmbh Device for securing the sequence of movements of at least two fluid-operated displacement units
DE102007062491A1 (en) 2007-12-22 2009-06-25 Linde Material Handling Gmbh Lifting device for industrial truck, has lifting cylinders pressure impinged by control valve, where flow cross section of valve is downsized at low temperatures, and expandable and retractable sequences of cylinders are maintained
DE102008013765A1 (en) 2008-03-12 2009-09-17 Linde Material Handling Gmbh Device for securing the sequence of movements of at least two fluid-operated displacement units
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
DE102012107159A1 (en) 2012-08-03 2014-02-06 Linde Material Handling Gmbh Hydraulic device for securing extension sequence of two common pressure medium sources attached to lifting cylinders, in mast of truck, has a control valve controlled in response to differential pressure that occurs at throttle device
DE102013103203A1 (en) 2013-03-28 2014-10-02 Linde Material Handling Gmbh Lifting cylinder device of a multi-stage mast of a truck

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1431497A1 (en) * 1964-05-04 1968-12-19 Hans Still Gmbh Hydraulic lifting device, especially for industrial trucks
DE1804054A1 (en) * 1967-10-20 1969-12-18 Cascade Corp Sequence control for a hydraulic motor
US3587784A (en) * 1968-09-26 1971-06-28 Hunter Manufacturing Co Inc Telescopic load booster
DE2507416A1 (en) * 1975-02-21 1976-08-26 Hunger Walter Kg Parallel connected double acting telescopic cylinders - has flow divider to split flow to two cylinders with hydraulic regulating valve
FR2321448A1 (en) * 1975-08-20 1977-03-18 Eaton Corp HYDRAULIC SYSTEM FOR LIFT TRUCK
US4041839A (en) * 1975-11-24 1977-08-16 Cascade Corporation Telescopic ram
US4593791A (en) * 1984-04-17 1986-06-10 Allis-Chalmers Corporation Automatic sequencing circuit for lift cylinders

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1431497A1 (en) * 1964-05-04 1968-12-19 Hans Still Gmbh Hydraulic lifting device, especially for industrial trucks
DE1804054A1 (en) * 1967-10-20 1969-12-18 Cascade Corp Sequence control for a hydraulic motor
US3587784A (en) * 1968-09-26 1971-06-28 Hunter Manufacturing Co Inc Telescopic load booster
DE2507416A1 (en) * 1975-02-21 1976-08-26 Hunger Walter Kg Parallel connected double acting telescopic cylinders - has flow divider to split flow to two cylinders with hydraulic regulating valve
FR2321448A1 (en) * 1975-08-20 1977-03-18 Eaton Corp HYDRAULIC SYSTEM FOR LIFT TRUCK
US4041839A (en) * 1975-11-24 1977-08-16 Cascade Corporation Telescopic ram
US4593791A (en) * 1984-04-17 1986-06-10 Allis-Chalmers Corporation Automatic sequencing circuit for lift cylinders

Also Published As

Publication number Publication date
DE10125351A1 (en) 2002-11-28
EP1260478A2 (en) 2002-11-27
DE50212778D1 (en) 2008-10-30
EP1260478B1 (en) 2008-09-17

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