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IT1272114B - FORK LIFTING UNITS IN FORKLIFTS - Google Patents

FORK LIFTING UNITS IN FORKLIFTS

Info

Publication number
IT1272114B
IT1272114B ITMI930528A ITMI930528A IT1272114B IT 1272114 B IT1272114 B IT 1272114B IT MI930528 A ITMI930528 A IT MI930528A IT MI930528 A ITMI930528 A IT MI930528A IT 1272114 B IT1272114 B IT 1272114B
Authority
IT
Italy
Prior art keywords
stroke
forklifts
forks
piston
lifting units
Prior art date
Application number
ITMI930528A
Other languages
Italian (it)
Inventor
Luigi Santamaria
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
Priority to ITMI930528A priority Critical patent/IT1272114B/en
Publication of ITMI930528A0 publication Critical patent/ITMI930528A0/en
Priority to DE69413593T priority patent/DE69413593T2/en
Priority to AT94200679T priority patent/ATE171695T1/en
Priority to ES94200679T priority patent/ES2123704T3/en
Priority to EP94200679A priority patent/EP0622331B1/en
Publication of ITMI930528A1 publication Critical patent/ITMI930528A1/en
Application granted granted Critical
Publication of IT1272114B publication Critical patent/IT1272114B/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
    • B66F9/08—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 un'unità di sollevamento delle forche in carrelli elevatori impiegante per il sollevamento e l'abbassamento delle forche uno o più cilindri idraulici a semplice effetto (19), è previsto che nei due tratti terminali contrapposti di corsa del pistone (31) del cilindro idraulico (19) elementi di intercettazione (37, 34) determinino una riduzione di sezione di deflusso di fluido motore rispettivamente da una prima (44) e da una seconda camera (45) a volume variabile all'interno del cilindro idraulico (19); ciò determina una frenatura della corsa del pistone (31) e quindi dello stelo di azionamento (33) ad esso solidale, evitando brusche sollecitazioni al carico gravante sulle forche.In a forklift lifting unit used for lifting and lowering the forks one or more single-acting hydraulic cylinders (19), it is provided that in the two opposite end stroke sections of the piston stroke (31) of the cylinder hydraulic (19) shut-off elements (37, 34) cause a reduction of the engine fluid outflow section respectively from a first (44) and a second chamber (45) with variable volume inside the hydraulic cylinder (19); this causes a braking of the stroke of the piston (31) and therefore of the driving rod (33) integral with it, avoiding sudden stresses to the load on the forks.

ITMI930528A 1993-03-19 1993-03-19 FORK LIFTING UNITS IN FORKLIFTS IT1272114B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ITMI930528A IT1272114B (en) 1993-03-19 1993-03-19 FORK LIFTING UNITS IN FORKLIFTS
DE69413593T DE69413593T2 (en) 1993-03-19 1994-03-16 Lifting unit for the forks of pallet trucks
AT94200679T ATE171695T1 (en) 1993-03-19 1994-03-16 LIFTING UNIT FOR THE FORKS OF PALLET TRUCKS
ES94200679T ES2123704T3 (en) 1993-03-19 1994-03-16 A UNIT TO LIFT THE FORKS OF THE FORKLIFT TRUCKS.
EP94200679A EP0622331B1 (en) 1993-03-19 1994-03-16 A lifting unit for the forks of lift trucks

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 (3)

Publication Number Publication Date
ITMI930528A0 ITMI930528A0 (en) 1993-03-19
ITMI930528A1 ITMI930528A1 (en) 1994-09-19
IT1272114B true IT1272114B (en) 1997-06-11

Family

ID=11365414

Family Applications (1)

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

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
ITMI930528A1 (en) 1994-09-19
ATE171695T1 (en) 1998-10-15
EP0622331B1 (en) 1998-09-30
ES2123704T3 (en) 1999-01-16
ITMI930528A0 (en) 1993-03-19
DE69413593T2 (en) 1999-03-18
EP0622331A1 (en) 1994-11-02
DE69413593D1 (en) 1998-11-05

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19990331