DE69413593D1 - Lifting unit for the forks of pallet trucks - Google Patents

Lifting unit for the forks of pallet trucks

Info

Publication number
DE69413593D1
DE69413593D1 DE69413593T DE69413593T DE69413593D1 DE 69413593 D1 DE69413593 D1 DE 69413593D1 DE 69413593 T DE69413593 T DE 69413593T DE 69413593 T DE69413593 T DE 69413593T DE 69413593 D1 DE69413593 D1 DE 69413593D1
Authority
DE
Germany
Prior art keywords
forks
lifting unit
piston
pallet trucks
chamber
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.)
Expired - Fee Related
Application number
DE69413593T
Other languages
German (de)
Other versions
DE69413593T2 (en
Inventor
Luigi Santamaria
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 SpA
Original Assignee
Fiat Om Carrelli Elevatori SpA
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 Fiat Om Carrelli Elevatori SpA filed Critical Fiat Om Carrelli Elevatori SpA
Publication of DE69413593D1 publication Critical patent/DE69413593D1/en
Application granted granted Critical
Publication of DE69413593T2 publication Critical patent/DE69413593T2/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
    • B66F9/08—Masts; Guides; Chains
    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Loading Or Unloading Of Vehicles (AREA)
  • Actuator (AREA)
  • Handcart (AREA)

Abstract

In a unit for lifting the forks of lift trucks using one or more single-acting hydraulic cylinders (19) to lift or lower the forks, in two opposite end-of-travel strokes of the piston (31) of the hydraulic cylinder (19), interception means (37, 34) determine a reduction in the cross-section of the working fluid outflow respectively from a first chamber (44) and from a second chamber (45) of variable volumes inside the hydraulic cylinder (19); this brakes the travel of the piston (31) and thus of the actuating rod (33), which is integral with the latter, preventing abrupt stresses being applied to the load on the forks. <IMAGE>
DE69413593T 1993-03-19 1994-03-16 Lifting unit for the forks of pallet trucks Expired - Fee Related DE69413593T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI930528A IT1272114B (en) 1993-03-19 1993-03-19 FORK LIFTING UNITS IN FORKLIFTS

Publications (2)

Publication Number Publication Date
DE69413593D1 true DE69413593D1 (en) 1998-11-05
DE69413593T2 DE69413593T2 (en) 1999-03-18

Family

ID=11365414

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69413593T Expired - Fee Related DE69413593T2 (en) 1993-03-19 1994-03-16 Lifting unit for the forks of pallet trucks

Country Status (5)

Country Link
EP (1) EP0622331B1 (en)
AT (1) ATE171695T1 (en)
DE (1) DE69413593T2 (en)
ES (1) ES2123704T3 (en)
IT (1) IT1272114B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19710556C2 (en) * 1997-03-14 1999-03-11 Jungheinrich Ag Extendable mast construction for a pallet truck
DE29707639U1 (en) 1997-04-28 1997-08-21 Still GmbH, 22113 Hamburg Hydraulic cylinder with shock protection
DE19802119A1 (en) * 1998-01-21 1999-07-22 Still Wagner Gmbh & Co Kg Industrial truck with a lifting device
US6557456B2 (en) 2001-05-24 2003-05-06 The Raymond Corporation Cushioned actuator
DE10214864C5 (en) * 2002-04-04 2009-12-17 Linde Material Handling Gmbh Hydraulic cylinder with cushioning

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1414638A (en) * 1964-11-25 1965-10-15 Appalette Adjustable hydraulic end-of-stroke shock absorber for plunger hydraulic cylinders
FR2024747A1 (en) * 1969-05-02 1970-09-04 Lati Ste
US4006666A (en) * 1975-05-22 1977-02-08 Towmotor Corporation Cushioning device for a hydraulic jack
DE3146845A1 (en) * 1981-11-26 1983-06-01 Wabco Steuerungstechnik GmbH & Co, 3000 Hannover DEVICE FOR STOPPING THE WORKING PISTON OF A DOUBLE-ACTING WORK CYLINDER
US4476960A (en) * 1982-08-09 1984-10-16 Towmotor Corporation Adjustable chain anchor for lift trucks
US4706781A (en) * 1985-02-28 1987-11-17 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Fluid-operated cylinder with cushioning flow rate control valve means

Also Published As

Publication number Publication date
ATE171695T1 (en) 1998-10-15
EP0622331B1 (en) 1998-09-30
EP0622331A1 (en) 1994-11-02
IT1272114B (en) 1997-06-11
ES2123704T3 (en) 1999-01-16
ITMI930528A1 (en) 1994-09-19
ITMI930528A0 (en) 1993-03-19
DE69413593T2 (en) 1999-03-18

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee