EP0592235A2 - Steuervorrichtung für Lasthandhabungsfahrzeug - Google Patents

Steuervorrichtung für Lasthandhabungsfahrzeug Download PDF

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Publication number
EP0592235A2
EP0592235A2 EP93308016A EP93308016A EP0592235A2 EP 0592235 A2 EP0592235 A2 EP 0592235A2 EP 93308016 A EP93308016 A EP 93308016A EP 93308016 A EP93308016 A EP 93308016A EP 0592235 A2 EP0592235 A2 EP 0592235A2
Authority
EP
European Patent Office
Prior art keywords
carriage
load
control system
operable
control
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
EP93308016A
Other languages
English (en)
French (fr)
Other versions
EP0592235A3 (en
EP0592235B1 (de
Inventor
Sir Neville Bowman Shaw
Murray Turner
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.)
BOSS MANUFACTURING Ltd
BOSS UK HOLDING Co Ltd
Original Assignee
Boss Group Ltd
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 Boss Group Ltd filed Critical Boss Group Ltd
Publication of EP0592235A2 publication Critical patent/EP0592235A2/de
Publication of EP0592235A3 publication Critical patent/EP0592235A3/en
Application granted granted Critical
Publication of EP0592235B1 publication Critical patent/EP0592235B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a load handling vehicle of the kind comprising a lifting mast, and a lifting carriage having means for engaging a load moveable up and down the mast; and more particularly to a control system for such a vehicle.
  • the lifting mast in vehicles of this kind is commonly formed from two or more telescopic sections which are extended to increase the height to which the load can be lifted.
  • the required maximum lifting height has increased substantially over recent years and very tall extended masts are now needed to meet the demands of operators in this field. For example, empty freight containers are frequently stored in stacks of up to seven containers high, giving a required lifting height of more than 15 metres for the top container in the stack.
  • U.S. Patent No. 4111283 a two-stage regulator valve is described for regulating the lowering speed. At normal pressure in the lift circuit the valve remains open, but should the pressure fall below a predetermined level due to slack in the lifting chains caused for example by inadvertent engagement of the lifting carriage with an obstruction, a subsequent dangerous free drop of the carriage is prevented by operation of the regulator valve to prevent further discharge of fluid from the lift cylinder.
  • None of these prior arrangements provide a control system for a load-handling vehicle in which the lowering speed of the unladen carriage can exceed the maximum lowering speed of the carriage when laden. Such an arrangement is within the ambit of current legislation and is proposed by the present invention. It can significantly reduce the time taken to complete a given loading or unloading operation.
  • a control system for a load handling vehicle of the kind comprising a lifting mast and a carriage having means for engaging a load which is moveably up and down the mast, said control system comprising control means for controlling the rate of descent of said carriage; wherein the control means is operable to limit the rate of descent of the carriage to a pre-determined maximum value when a load is being carried thereby, and to permit lowering of the carriage at a higher rate when the carriage is in an unloaded condition.
  • control means is operable to change the permitted rate of descent of the carriage from one value to another automatically in response to the presence of a load thereon. This is suitably achieved by load sensing means on the carriage. The higher rate of descent is thus selected automatically in the unloaded condition of the vehicle.
  • control means may be manually operable to change the permitted rate of descent of the load engaging means from one value to another. This arrangement enables the rate of descent to be selected by the driver of the vehicle depending on whether it is in an unloaded or loaded condition.
  • control means is operable selectively to vary the permitted rate of descent of the carriage in the unloaded condition. This enables the operator of the vehicle to select the rate of descent depending on local working conditions.
  • the hydraulic circuit shown in the drawing is intended for controlling the operation of a container-handling vehicle fitted with a telescopic mast assembly of substantial height, e.g. more than 15m in the extended position.
  • Various operating elements are illustrated including a cylinder 25 and associated steer pump 9 for operating the vehicle steering; lift cylinders 18 and 19 for raising and lowering the telescopic mast assembly (which in known manner entrains the lifting carriage along it); tilt cylinders 7 for tilting the mast assembly between its lifting and travelling positions; reach cylinders 6 and side-shift cylinder 5, with their associated control manifold 4; and hydraulic valve 3 for the power-assisted braking circuit.
  • These components are all conventional and most of these will not be described in further detail.
  • the main components associated with the control system of the invention are hydraulic pumps 10 and 11, lift and lowering valve 14, lift cylinders 18 and 19, auxiliary lowering valve 21, auxiliary lift and lowering valve 24, and joystick controller 30.
  • the circuit described is intended for a container-handling vehicle and the carriage in this case supports a gantry having hydraulically-operated twistlocks 28 operable to engage the corner fittings of a container.
  • the control system of the invention can be applied to any load-handling vehicle, for example one in which the carriage comprises forks or other load-engaging means such as a "piggy-back" attachment for handling intermodal loads.
  • Valve 14, auxiliary lowering valve 21 and auxiliary lift and lowering valve 24 are all operated by servos controlled remotely by joystick controller 30 located in the driver's cab.
  • the servos are operated hydraulically but they could be operated by other means, such as electrically.
  • the position of these valves determines whether or not hydraulic fluid is fed to, held in, or expelled from lift cylinders 18 and 19.
  • An electrical interlock 29 is connected between the servos which control valves 21 and 24 and the twistlocks 28.
  • Hydraulic pump 10 is dedicated to lift cylinders 18 and 19 and supplies fluid under pressure to valve 14 via line 12. In the position of this valve which is shown in the drawing, the cylinders are inactive and fluid from pump 10 is diverted back to fluid reservoir 16 via return line 17. Operation of joystick controller 30 to call for raising of the mast and carriage assembly causes valve 14 to move to the right in the drawing, directing fluid from line 12 into line 20 and operating lift cylinders 18 and 19. Movement of joystick controller 30 into the lift position also operates auxiliary lift and lowering valve 24 which is supplied with fluid (when available) by pump 11. The servos are designed such that initial movement of the joystick controller operates valve 24 to provide slow-speed lift under fine control.
  • valve 14 Further operation of the joystick causes valve 14 to operate as well, giving full lift flow to cylinders 18 and 19. In this condition, additional lift is supplied by pump 11 if fluid pressure is not being used for steering. Pump 11 supplies steering flow to hand steer pump 9 and thus to steer cylinder 25 via lines 26 and 27 but if some or all of this flow is not required, load sensing flow divider 22 sends fluid via line 23 to auxiliary lift and lowering valve 24 where it is directed via lines 31, 32 and 33 to cylinders 18 and 19 to supplement the flow supplied through line 20.
  • the twist-locks 28 will be engaged with the corner fittings of the container being carried and the electrical interlock 29 will automatically disengage the servos controlling auxiliary lowering valve 21 and auxiliary lift and lowering valve 24 so as to prevent these valves from moving into a lowering position.
  • operation of the joystick control 30 to call for lowering of the load will cause only valve 14 to operate by moving to the left in the drawing, connecting line 20 to return line 36 and thereby returning fluid from cylinders 18 and 19 to reservoir 16.
  • the rate of retraction of cylinders 18 and 19 will be determined by the size of the load and the restrictions 34 built into line 20, but under current legislation this will not exceed 0.6 m/sec with a fully-loaded container.
  • a higher lowering speed is achieved where no load is being carried by the vehicle.
  • the twist locks 28 are in the disengaged position and the electrical interlock 29 allows operation of both auxiliary lowering valve 21 and auxiliary lift and lowering valve 24.
  • lift valve 14 moves to the left as before, and auxiliary valves 21 and 24 are moved upwardly in the drawing into their lowering position.
  • This connects lines 32 and 33, via lines 31 and 35, with return line 36 leading to reservoir 16. Since additional return lines are open, lift cylinders 18 and 19 void at a faster rate, and lowering of the mast and carriage assembly is achieved more rapidly.
  • the lowering speed is determined by restrictions 37 in lines 32 and 33 but this will be significantly higher than the maximum lowering speed in the loaded condition, for example between 0.8 and 1.4 m/sec and preferably about 1.2 m/sec.
  • Restrictions 37 may not be required to control lowering in the unladen condition; instead the return flow may by-pass any check valve, and the carriage lowered as quickly as fluid can be displaced through the valves to the reservoir 16.
  • a manual control can be provided to allow the operator to select the rate of descent as required by conditions, and as permitted by current legislation.
  • control circuit described herein represents only one possible solution to the control system of the invention.
  • a data carrier such as a magnetic card

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jib Cranes (AREA)
EP19930308016 1992-10-09 1993-10-08 Steuervorrichtung für Lasthandhabungsfahrzeug Expired - Lifetime EP0592235B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9221304A GB2271339B (en) 1992-10-09 1992-10-09 Control system for load-handling vehicle
GB9221304 1992-10-09

Publications (3)

Publication Number Publication Date
EP0592235A2 true EP0592235A2 (de) 1994-04-13
EP0592235A3 EP0592235A3 (en) 1994-08-10
EP0592235B1 EP0592235B1 (de) 1999-04-28

Family

ID=10723244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930308016 Expired - Lifetime EP0592235B1 (de) 1992-10-09 1993-10-08 Steuervorrichtung für Lasthandhabungsfahrzeug

Country Status (4)

Country Link
EP (1) EP0592235B1 (de)
DE (1) DE69324642T2 (de)
ES (1) ES2132195T3 (de)
GB (1) GB2271339B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644151A1 (de) * 1993-09-17 1995-03-22 Boss Group Limited Hydraulischer Steuerkreislauf für einen selbstbetriebenen Hubwagen
EP3533752A1 (de) * 2018-02-28 2019-09-04 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem hydraulischen masthubzylinder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2160696C2 (ru) * 1997-10-31 2000-12-20 Стесин Александр Борисович Гидравлическая система вилочного автопогрузчика

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285282A (en) * 1964-10-22 1966-11-15 Parker Hannifin Corp Flow control valve for fluid motors and the like
US3414007A (en) * 1965-04-19 1968-12-03 Fluid Controls Inc Load lowering valve for hydraulic hoists
US3685537A (en) * 1970-04-14 1972-08-22 Shimadzu Corp Fluid flow control valve
DE2227823C3 (de) * 1972-06-08 1975-10-16 Friedrich Kocks Gmbh, 2800 Bremen Ladegeschirr für Container
US4111283A (en) * 1976-12-20 1978-09-05 Clark Equipment Company Regulator valve
JPS63230497A (ja) * 1987-03-20 1988-09-26 日産自動車株式会社 産業車両の荷役装置
US4716929A (en) * 1987-05-04 1988-01-05 B. W. Rogers Company Flow control valve
JPH03159879A (ja) * 1989-11-20 1991-07-09 Toyota Autom Loom Works Ltd 産業車両の荷役制御装置
JP2668754B2 (ja) * 1991-12-25 1997-10-27 小松フォークリフト株式会社 産業車両の荷役制御方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644151A1 (de) * 1993-09-17 1995-03-22 Boss Group Limited Hydraulischer Steuerkreislauf für einen selbstbetriebenen Hubwagen
EP3533752A1 (de) * 2018-02-28 2019-09-04 Jungheinrich Aktiengesellschaft Flurförderzeug mit mindestens einem hydraulischen masthubzylinder
US11377334B2 (en) 2018-02-28 2022-07-05 Jungheinrich Aktiengesellschaft Industrial truck with at least one hydraulic mast lift cylinder

Also Published As

Publication number Publication date
GB2271339A (en) 1994-04-13
GB2271339B (en) 1996-05-08
DE69324642D1 (de) 1999-06-02
EP0592235A3 (en) 1994-08-10
GB9221304D0 (en) 1992-11-25
EP0592235B1 (de) 1999-04-28
DE69324642T2 (de) 1999-09-30
ES2132195T3 (es) 1999-08-16

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