EP1308415A3 - Hydraulic lifting device in particular for battery-powered industrial trucks and control method therefor - Google Patents

Hydraulic lifting device in particular for battery-powered industrial trucks and control method therefor Download PDF

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Publication number
EP1308415A3
EP1308415A3 EP02024330A EP02024330A EP1308415A3 EP 1308415 A3 EP1308415 A3 EP 1308415A3 EP 02024330 A EP02024330 A EP 02024330A EP 02024330 A EP02024330 A EP 02024330A EP 1308415 A3 EP1308415 A3 EP 1308415A3
Authority
EP
European Patent Office
Prior art keywords
pump
hydraulic
lifting device
hydraulic lifting
electric motor
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
EP02024330A
Other languages
German (de)
French (fr)
Other versions
EP1308415B1 (en
EP1308415A2 (en
Inventor
Octavian Mare
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.)
Dambach Lagersysteme & Co KG GmbH
Original Assignee
Dambach Lagersysteme & Co KG 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
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Publication of EP1308415A2 publication Critical patent/EP1308415A2/en
Publication of EP1308415A3 publication Critical patent/EP1308415A3/en
Application granted granted Critical
Publication of EP1308415B1 publication Critical patent/EP1308415B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • 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
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3057—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having two valves, one for each port of a double-acting output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member

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

Abstract

Eine hydraulische Hubvorrichtung insbesondere für batteriegetriebene Flurförderzeuge, besitzt eine von einem Elektromotor (M) antreibbare Pumpe (P), mittels der im Lasthebebetrieb zumindest einem hydraulischen Hubzylinder (12) Hydrauliköl aus einem Vorratsbehälter (11) über eine Zuführleitung (L1) zugeführt wird. Das Hydrauliköl wird im Lastsenkbetrieb von dem Hubzylinder (12) über eine Rückströmleitung (L2,L3,L1.2,L6) unter Durchströmen der den als Generator arbeitenden Elektromotor (M) antreibenden Pumpe (P) in den Vorratsbehälter (11) zurückgeführt. Zur Steuerung der hydraulischen Hubvorrichtung ist vorgesehen, daß zu Beginn des Lastsenkbetriebes sowohl im stromauf der Pumpe (P) gelegenen Abschnitt (L2.3) der Rückströmleitung als auch im stromab der Pumpe (P) gelegenen Abschnitt (L1.2) der Rückströmleitung im wesentlichen der im Hubzylinder (12) herrschende hydraulische Druck aufgebaut wird, wobei die Pumpe (P) mit einer IST-Drehzahl betrieben wird, die unterhalb eines Drehzahl-Grenzwertes liegt. Ein in der Rückströmleitung stromab der Pumpe (P) angeordnetes proportionales Druckbegrenzungsventil (PDBV) wird über eine Rampenfunktion erst dann vollständig geöffnet, wenn die IST-Drehzahl der Pumpe (P) oberhalb des Drehzahl-Grenzwertes liegt, wobei der Elektromotor (M) dann als Generator arbeitet.

Figure 00000001
A hydraulic lifting device, in particular for battery-powered industrial trucks, has a pump (P) which can be driven by an electric motor (M), by means of which at least one hydraulic lifting cylinder (12) is supplied with hydraulic oil from a storage container (11) via a supply line (L1) during load lifting operation. The hydraulic oil is recirculated in the load lowering operation of the lifting cylinder (12) via a return line (L2, L3, L1.2, L6) while flowing through the operating as a generator electric motor (M) pump (P) in the reservoir (11). To control the hydraulic lifting device is provided that at the beginning of the load lowering operation both in the upstream of the pump (P) located portion (L2.3) of the return flow as well as in the downstream of the pump (P) located portion (L1.2) of the return flow substantially the prevailing in the lifting cylinder (12) hydraulic pressure is built up, wherein the pump (P) is operated at an actual speed, which is below a speed limit value. A in the return line downstream of the pump (P) arranged proportional pressure relief valve (PDBV) is fully opened via a ramp function only when the actual speed of the pump (P) is above the speed limit, the electric motor (M) than Generator works.
Figure 00000001
EP20020024330 2001-11-06 2002-11-02 Hydraulic lifting device in particular for battery-powered industrial trucks and control method therefor Expired - Fee Related EP1308415B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10154449 2001-11-06
DE2001154449 DE10154449A1 (en) 2001-11-06 2001-11-06 Hydraulic lifting device, in particular for battery-powered industrial trucks, and method for controlling it

Publications (3)

Publication Number Publication Date
EP1308415A2 EP1308415A2 (en) 2003-05-07
EP1308415A3 true EP1308415A3 (en) 2005-05-25
EP1308415B1 EP1308415B1 (en) 2007-02-07

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Family Applications (1)

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EP20020024330 Expired - Fee Related EP1308415B1 (en) 2001-11-06 2002-11-02 Hydraulic lifting device in particular for battery-powered industrial trucks and control method therefor

Country Status (2)

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EP (1) EP1308415B1 (en)
DE (2) DE10154449A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107010571A (en) * 2015-11-05 2017-08-04 株式会社丰田自动织机 Industrial vehicle
CN107352473A (en) * 2017-09-22 2017-11-17 太仓市高泰机械有限公司 A kind of method of work of self-adjusting type hydraulic car
CN107458999A (en) * 2017-09-22 2017-12-12 太仓市高泰机械有限公司 A kind of self-adjusting type hydraulic car with damping device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE525159C2 (en) * 2002-06-05 2004-12-14 Bt Ind Ab Procedure for controlling the lowering movement of a truck's air cylinder
DE102009053618A1 (en) * 2009-11-17 2011-05-19 Robert Bosch Gmbh Hydraulic drive with energy recovery
US8196464B2 (en) * 2010-01-05 2012-06-12 The Raymond Corporation Apparatus and method for monitoring a hydraulic pump on a material handling vehicle
KR20110127773A (en) 2010-05-20 2011-11-28 두산산업차량 주식회사 Energy reclaiming system for an electric forklift truck
CN102108948B (en) * 2010-12-28 2012-11-28 山河智能装备股份有限公司 Renewable energy power generating system applicable to electrocar for loading, unloading and transporting
DE102012005432A1 (en) * 2012-03-17 2013-09-19 Jungheinrich Aktiengesellschaft Industrial truck for lifting load, has vertical monitoring unit comparing detected pressure values of pressure sensors with each other and generating emergency signal when deviation of pressure values is greater than predetermined value
CN107601390A (en) * 2017-09-22 2018-01-19 太仓市高泰机械有限公司 A kind of method of work of the hydraulic car with auto-lock function
CN107601391A (en) * 2017-09-22 2018-01-19 太仓市高泰机械有限公司 The automatic sensing and self-locking method of a kind of hydraulic car
CN112209305A (en) * 2020-10-30 2021-01-12 合力工业车辆（上海）有限公司 Hydraulic system of storage forklift
CN215058526U (en) * 2021-03-19 2021-12-07 湖南星邦智能装备股份有限公司 Control loop of double-acting floating oil cylinder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416173A1 (en) * 1994-05-06 1995-11-09 Jungheinrich Ag Hydraulic lifting system for battery operated ground conveyor vehicle
EP0908413A2 (en) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Lift truck with a load grasping device and method for descending the load grasping device
DE19921629A1 (en) * 1999-05-10 2000-11-16 Dambach Lagersysteme Gmbh Hydraulic lifting device
EP1193211A2 (en) * 2000-09-28 2002-04-03 STILL WAGNER GmbH & Co KG Hydraulic lifting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416173A1 (en) * 1994-05-06 1995-11-09 Jungheinrich Ag Hydraulic lifting system for battery operated ground conveyor vehicle
EP0908413A2 (en) * 1997-10-08 1999-04-14 Still Wagner GmbH & Co. KG Lift truck with a load grasping device and method for descending the load grasping device
DE19921629A1 (en) * 1999-05-10 2000-11-16 Dambach Lagersysteme Gmbh Hydraulic lifting device
EP1193211A2 (en) * 2000-09-28 2002-04-03 STILL WAGNER GmbH & Co KG Hydraulic lifting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107010571A (en) * 2015-11-05 2017-08-04 株式会社丰田自动织机 Industrial vehicle
CN107352473A (en) * 2017-09-22 2017-11-17 太仓市高泰机械有限公司 A kind of method of work of self-adjusting type hydraulic car
CN107458999A (en) * 2017-09-22 2017-12-12 太仓市高泰机械有限公司 A kind of self-adjusting type hydraulic car with damping device

Also Published As

Publication number Publication date
DE10154449A1 (en) 2003-05-15
DE50209428D1 (en) 2007-03-22
EP1308415B1 (en) 2007-02-07
EP1308415A2 (en) 2003-05-07

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