EP1348668B1 - Variable reach lift truck with three wheels - Google Patents

Variable reach lift truck with three wheels Download PDF

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Publication number
EP1348668B1
EP1348668B1 EP20030290757 EP03290757A EP1348668B1 EP 1348668 B1 EP1348668 B1 EP 1348668B1 EP 20030290757 EP20030290757 EP 20030290757 EP 03290757 A EP03290757 A EP 03290757A EP 1348668 B1 EP1348668 B1 EP 1348668B1
Authority
EP
European Patent Office
Prior art keywords
truck
wheel
characterized
advance
wheels
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.)
Active
Application number
EP20030290757
Other languages
German (de)
French (fr)
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EP1348668A1 (en
Inventor
Marcel-Claude Braud
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.)
Manitou BF
Original Assignee
Manitou BF
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Publication date
Priority to FR0204044 priority Critical
Priority to FR0204044A priority patent/FR2837809B1/en
Application filed by Manitou BF filed Critical Manitou BF
Publication of EP1348668A1 publication Critical patent/EP1348668A1/en
Application granted granted Critical
Publication of EP1348668B1 publication Critical patent/EP1348668B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices 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
    • B66F9/065Devices 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 non-masted
    • B66F9/0655Devices 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 non-masted with a telescopic boom
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices 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
    • B66F9/075Constructional features or details
    • B66F9/07559Stabilizing means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices 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
    • B66F9/075Constructional features or details
    • B66F9/07572Propulsion arrangements

Description

  • The invention relates to a motorized lift truck, with variable range, in which the front end of the telescopic arm extends forward of the front wheels in the load transport position.
  • The invention is particularly useful in its application to a three-wheel variable-reach forklift.
  • Three-wheeled variable reach trucks marketed by the company MANITOU BF under French law under the name TMT are known: these three-wheel variable-span trolleys have a U-shaped frame, so as to be able to move a load back inside the trolley. U-frame in transport position. These carriages are particularly adapted to be embarked at the rear of a carrier vehicle, as described in document EP 701 963 A1 .
  • Because of the particular structure of these TMT trolleys suitable for being on the rear of a carrier vehicle, these trolleys have the disadvantage of a wide front track of the order of 2 m and a short wheelbase of the order of 1.40 m. This structure also has the disadvantage of a relatively short telescopic arm, to achieve a lifting height of about 3 m.
  • Because of their particular structure for moving the load back inside the U-frame in the transport position, these TMT trolleys suitable for being on the rear of a carrier vehicle have good lateral cornering stability.
  • A first object of the invention is to provide a new lift truck with variable reach, at least three wheels, having a frame structure for a wide variety of uses.
  • A second object of the invention is to provide a new forklift with variable reach, at least three wheels, simple and economical structure, having a telescopic arm of considerable length, to achieve a high lifting height.
  • A third object of the invention is to provide a new forklift with variable reach, with at least three wheels, in which the front end of the arm telescopic extends forward of the front wheels in load transport position, and having good lateral cornering stability.
  • A fourth object of the invention is to provide a new variable-reach forklift, with at least three wheels, in which the front end of the telescopic arm extends forward of the front wheels in the load transport position, presenting a good lateral cornering stability without the need for operator intervention at the driving position.
  • The document GB 2 290 149 A describes a system for ensuring the stability and operational safety of lift trucks.
  • The invention relates to a forklift with variable range, with three wheels and telescopic arm, in which the front end of the telescopic arm extends forward of the front wheels in the load transport position, of the type comprising a wheel rear steering wheel and two front wheels, a driving position and a power train integral with a chassis, characterized in combination in that:
    • the carriage is hydrostatic transmission and comprises a system limiting the maximum speed of advancement according to the steering angle of the truck, so as to ensure lateral stability in cornering of the carriage,
    • the system limiting the maximum speed of advance according to the steering angle of the carriage is connected to or co-operates with the hydrostatic transmission of the carriage;
    the system limiting the maximum speed of advance according to the steering angle comprises a valve for reducing the pilot pressure of the hydrostatic transmission of the carriage;
    said pilot pressure reduction valve is a push valve cooperating with an actuator related to the steering angle of the carriage; and
    the pilot pressure decreases as a function of the pusher output of the pilot pressure reduction valve.
  • According to other alternative features of the invention:
    • the system limiting the maximum speed of advance of the carriage is controlled by an actuator related to the steering angle of at least one steering wheel,
    • the actuator can be secured to a steering cylinder of the carriage, or, alternatively, the actuator can be secured to a support or steering wheel pivot,
    • the frame has a compact conformation and elongated in the longitudinal direction of travel of the carriage,
    • the chassis has two lateral inclination limitation shoes, arranged on either side of the rear wheel of the carriage,
    • the lateral inclination limiting shoes are preferably arranged in the tracks of the front wheels, when the carriage is traveling in a straight line.
  • The invention will be better understood from the following description given by way of nonlimiting example with reference to the accompanying drawings in which:
    • The figure 1 schematically represents a side elevational view of the left side of a forklift according to the invention.
    • The figure 2 schematically represents a side elevational view of the right side of a forklift according to the invention.
    • The figure 3 shows schematically an example of a maximum speed reference speed curve as a function of the steering angle of the rear wheel of a forklift truck according to the invention.
    • The Figures 4 to 7 schematically represent top views of a first forklift steering system according to the invention intended to comply with a maximum speed instruction of the kind shown in FIG. figure 3 .
    • The Figures 8 to 11 schematically represent top views of another forklift steering system according to the invention intended to comply with a maximum speed instruction of the kind shown in FIG. figure 3 .
    • The figure 12 schematically represents a hydraulic forklift transmission diagram according to the invention intended to comply with a maximum forward speed instruction of the kind shown in FIG. figure 3 .
  • With reference to figures 1 and 2 , a three-wheel lift truck according to the invention comprises a steering wheel 1 and preferably driving wheel, a left front wheel 2 preferably driving and fixed direction, and a right front wheel 3 preferably driving and fixed direction.
  • The three wheels 1 to 3 are mounted on a frame 4 carrying a driving station 5 located on one side of the carriage and a housing 6 located on the opposite side to the driving position 5 relative to a telescopic arm 7 pivotally mounted under the action of a jacking cylinder around a substantially horizontal axis 8 located at the rear of the chassis 4 substantially above the rear wheel 1 driving and driving.
  • The casing 6 contains a power unit 9 comprising an internal combustion engine and driving at least one hydrostatic pump 10 supplying hydraulic energy to the wheel drive systems of the carriage according to the invention. The powertrain 9 drives, in a manner known per se, other hydraulic pumps for powering the actuators handling means and wheel steering systems.
  • The chassis 4 preferably comprises two shoes 11 and 12 located substantially in the track of the front wheels 2 and 3 to limit the lateral tilting angle of the carriage, and increase the lateral stability of the carriage, especially in bends.
  • Preferably, the carriage according to the invention is a compact carriage having an overall width close to 1.60 m and a cabin height of about 1.90 m. The cabin floor of the driving position 5 is a low floor directly accessible without intermediate step.
  • The ground clearance of the truck according to the invention is close to 30 cm, so as to allow use in any terrain, with the exception of hooves 11 and 12 of lateral inclination limitation located in the tracks of the front wheels 2 and 3.
  • The shoes 11 and 12 which locally limit the ground clearance are safety shoes to support the ground in case of loss of lateral stability, so as to oppose the overturning of the carriage according to the invention.
  • The casing 6 of the powertrain protection 9 has a profile descending forward, below the level of the right side window of the driving position 5, so as to provide total circular visibility to the driver sitting in the driving position 5.
  • The trolley according to the invention has a front wheelbase ratio greater than 1, unlike TMT trolleys of known type, intended to be loaded on the rear of a carrier vehicle.
  • In the position of maximum retraction of the arrow represented at figure 2 , the work accessory carried by the telescopic arm 7 protrudes forward of the front wheels 2 and 3, thus allowing to accommodate a telescopic arm 7 with a range and height of large lifts, much greater than the range and height lifting TMT trolleys of known type.
  • However, on this carriage with three wheels of small width, there is a risk of lateral instability, particularly when cornering, which requires the use of appropriate means such as hooves 11 and 12 of lateral inclination limitation.
  • Also, in the case of an excessive forward speed, and in the case of other trolleys with at least three wheels, for example four-wheel, this risk of lateral instability is further increased, particularly in cornering, due to the increase in inertial forces exerted on the machine proportionally to the square of the forward speed and inversely proportional to the radius of the turn.
  • To further improve the operational safety and lateral stability of a carriage according to the invention, it is desirable to provide a limitation of the maximum speed of cornering.
  • For this purpose, on the figure 3 a curve of maximum driving speed as a function of the steering angle in degrees of a steering wheel, for example of a rear wheel, is represented.
  • For an advance in a straight line, and up to a turning to the right or to the left of about 10 °, the maximum speed of a carriage according to the invention is limited to a speed of the order of 13.5 km / h.
  • Beyond a steering angle greater than 10 ° to the left or right, for example for a steering angle of 20 °, the maximum authorized speed decreases sharply to a value of approximately 8.5 km / h .
  • Beyond a steering angle of 20 ° and up to a steering angle of approximately 40 °, the steering speed decreases more slowly to a value close to 7 km / h, beyond a steering angle of 40 ° to the left or right to a steering angle of 65 ° left or right, the maximum authorized speed of the truck remains equal to 7 km / h.
  • This speed limitation is obtained by regulating the hydrostatic flow of the carriage according to the invention, preferably by acting on the piloting pressure of the hydrostatic pump.
  • To reduce the pilot pressure of the hydrostatic transmission, a pressure reducing valve similar to an inching valve is preferably used. This pressure reduction valve is controlled by a pusher whose stroke corresponds to the steering angle, as indicated by the correspondence arrows of the figure 3 .
  • It can be seen that for a straight-line advance the piloting pressure is maximum and close to 22 bar, whereas for a maximum steering angle, the piloting pressure is equal to 5 bar, corresponding to a pusher stroke equal to 5, 6 mm. The intermediate values of 20 ° and 40 ° steering angle respectively correspond to a push stroke of 1.2 mm and 5.6 mm.
  • The Figures 4 to 7 describe a first steering system of a steering wheel, for example a rear wheel 1.
  • The steering axis 20 of the support 21 carrying a steering wheel, for example a rear wheel 1, is secured to the chassis 4 not shown.
  • The rear wheel support 21 comprises a protrusion 22 subjected to the action of a jack 23 mounted between the articulation 24 on the support 21 and an axis 25 integral with the chassis 4, not shown.
  • The cylinder 23 carries an actuator 26 consisting for example of a rod 27 secured to the cylinder 23 and an adjustable screw 28 thrust. The adjustable screw 28 acts on a bushing 29 for driving a pusher 30 of the pressure reducing valve 31. The driving sleeve 29 is slidably mounted in a bore of a plate integral with the pilot pressure reduction valve 31.
  • So, in the straight forward position represented in the figure 4 , the pusher 30 is fully depressed inside the valve 31, which corresponds to a pressure of 22 bar and a maximum authorized speed of advance of 13.5 km / h ( figure 3 ).
  • On the figure 5 for a steering angle of 20 °, the pusher 30 is out 1.2 mm which corresponds to a pilot pressure of about 16 bar and a maximum permissible forward speed of 8.5 km / h.
  • On the figure 6 for a steering angle of 40 °, the pusher was pulled out 5.6 mm, which corresponds to a pilot pressure of 5 bar and a maximum allowable forward speed of 7 km / h.
  • On the figure 7 , for a steering angle of 65 °, the pusher also remains out of 5.6 mm, because of the limitation of this stroke by the stop of the sliding sleeve 29, which corresponds to a pilot pressure of 5 bar and at a maximum allowable speed of 7 km / h.
  • With reference to Figures 8 to 11 , another steering and speed limitation system according to the steering angle is shown with respectively identical steering angles to the steering angles described with reference to the Figures 3 to 7 .
  • In this example, the pusher strokes, the pilot pressures and the maximum permissible speeds are identical to the pusher strokes, the steering angles and the maximum permissible speeds described with reference to Figures 3 to 7 .
  • Of course, any other device for limiting the speed of advance of the carriage can also be envisaged, without departing from the scope of the present invention.
  • In this second system, a cam 32 is mounted integral with the support 21 of the rear wheel 1, so as to act on a sliding roller 33 of depression of the pusher 30 of the pilot pressure reduction valve 31.
  • Thus, thanks to the action of the cam 32 on the push-in roller 33 of the pusher 30, the pusher strokes, the corresponding pilot pressure reductions and the maximum speed limits of advance described with reference to FIG. figure 3 .
  • On the figure 12 a hydrostatic flow diagram of a carriage according to the invention is shown.
  • The motor 9 drives the hydrostatic pump 10 generating the hydrostatic energy of the truck.
  • The hydrostatic pump 10 is connected to a distribution block 40 for supplying the motor 41 for driving a steering wheel, for example a rear wheel; the drive motor 42 of the right front wheel; and the motor 43 for driving the left front wheel.
  • A brake solenoid valve 44 acts on the hydraulic fluid returns to the tank 46 to control the brakes of the driving wheels of the carriage according to the invention. A flow divider 47 provides a distribution of fluid flow between the three wheels to prevent slippage or slippage.
  • In known manner a cooler 48, a filter 49 suction and return of hydraulic fluid and a thumbing valve ("inching") 50 actuated by pedal are mounted in the hydrostatic circuit to perform functions known per se.
  • The valve 31 for reducing the pilot pressure of the hydrostatic pump 10 described with reference to Figures 4 to 11 is actuated by the pusher 30 as a function of the steering angle of the rear wheel 1.
  • Other variants of hydrostatic diagrams for a forklift truck with at least three wheels according to the invention can be envisaged without departing from the scope of the present invention, the essential point being to set a maximum authorized speed of advance of the carriage in function of an individual or average value representative of a steering angle.
  • The invention described with reference to several particular embodiments is not limited thereto, but on the contrary covers any modification of form and any variant embodiment within the scope and spirit of the invention.
  • Other variants of conformation forklift with at least three wheels according to the invention can be envisaged without departing from the scope of the present invention, the essential is to provide security means against a risk of loss of lateral stability, these safety means being able to oppose the overturning of the carriage according to the invention.

Claims (7)

  1. Lift truck with variable range, with at least three wheels and a telescopic arm (7), in which the front end of the telescopic arm (7) extends in front of the front wheels (2, 3) in the load transport position, of the type comprising a steerable rear wheel (1) and two front wheels (2, 3), a driver station (5) and a motor propulsion group (9) secured to a chassis (4), characterized, in combination, in that the truck comprises a system limiting the maximum speed of advance as a function of the wheel turning angle of the truck, so as to ensure the lateral stability of the truck when turning; in that the truck has a hydrostatic transmission; in that said system limiting the maximum speed of advance of the truck as a function of the wheel turning angle is connected to or co-operates with the hydrostatic transmission of the truck; in that the system limiting the maximum speed of advance as a function of the wheel turning angle comprises a control pressure reduction valve for the hydrostatic transmission of the truck; in that said control pressure reduction valve is a valve with a tappet co-operating with an actuator associated with the wheel turning angle of the truck; and in that the control pressure decreases as a function of the outlet of the tappet of the control pressure reduction valve.
  2. Truck according to Claim 1, characterized in that the system limiting the maximum speed of advance of the truck is controlled by an actuator connected to the wheel turning angle of at least one steerable wheel.
  3. Truck according to Claim 2, characterized in that the actuator can be secured to a steering cylinder for steering the truck.
  4. Truck according to Claim 2, characterized in that the actuator is secured to a support or pivot of a steerable wheel.
  5. Truck according to any one of Claims 1 to 4, characterized in that the chassis (4) has a compact structure elongated in the longitudinal direction of advance of the truck.
  6. Truck according to Claim 5, characterized in that the chassis has two shoes (11, 12) for limiting lateral inclination, disposed on opposite sides of the rear wheel (1) of the truck.
  7. Truck according to Claim 6, characterized in that the shoes (11, 12) for limiting lateral inclination are preferably disposed in the tracks of the front wheels (2, 3), when the truck advances in a straight line.
EP20030290757 2002-03-29 2003-03-26 Variable reach lift truck with three wheels Active EP1348668B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0204044 2002-03-29
FR0204044A FR2837809B1 (en) 2002-03-29 2002-03-29 Lift truck with variable range with three wheels

Publications (2)

Publication Number Publication Date
EP1348668A1 EP1348668A1 (en) 2003-10-01
EP1348668B1 true EP1348668B1 (en) 2009-09-23

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EP20030290757 Active EP1348668B1 (en) 2002-03-29 2003-03-26 Variable reach lift truck with three wheels

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US (1) US7121372B2 (en)
EP (1) EP1348668B1 (en)
AT (1) AT443685T (en)
DE (1) DE60329347D1 (en)
FR (1) FR2837809B1 (en)

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Publication number Priority date Publication date Assignee Title
GB0312343D0 (en) 2003-05-30 2003-07-02 Translift Engineering Ltd Fork lift truck
CN101856974A (en) * 2009-04-09 2010-10-13 曼尼通公司 Forklift with telescopic boom
US8731785B2 (en) 2011-03-18 2014-05-20 The Raymond Corporation Dynamic stability control systems and methods for industrial lift trucks
US9403667B2 (en) 2011-03-18 2016-08-02 The Raymond Corporation Dynamic vibration control systems and methods for industrial lift trucks
US9440830B2 (en) * 2011-12-14 2016-09-13 Big Lift, Llc Personnel lift vehicle
CN102556897B (en) * 2011-12-14 2014-05-28 浙江中力机械有限公司 Electric order picker
US8763990B2 (en) 2012-03-20 2014-07-01 The Raymond Corporation Turn stability systems and methods for lift trucks
WO2013190821A1 (en) * 2012-06-19 2013-12-27 住友重機械工業株式会社 Motor driving device for forklifts and forklifts using same
US9302893B2 (en) 2013-02-07 2016-04-05 The Raymond Corporation Vibration control systems and methods for industrial lift trucks
US9002557B2 (en) 2013-03-14 2015-04-07 The Raymond Corporation Systems and methods for maintaining an industrial lift truck within defined bounds
USD730614S1 (en) 2013-11-26 2015-05-26 Big Lift, Llc. Personnel lift vehicle

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DE1780525A1 (en) * 1968-09-26 1972-02-10 Traktorenwerk Schoenebeck Veb Apparatus for selbsttaetigen switching on and off of the differential lock for vehicles, especially tractors
US4364449A (en) * 1979-06-29 1982-12-21 Coventry Climax Limited Industrial truck
US4598797A (en) * 1984-04-13 1986-07-08 Clark Equipment Company Travel/lift inhibit control
GB9206824D0 (en) * 1992-03-28 1992-05-13 Translift Material Handling Fork lift truck
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GB2290149A (en) 1994-06-10 1995-12-13 Colin Stanley Smith System for ensuring the stability and safe operation of lift trucks
CA2158232C (en) 1994-09-14 2001-08-07 Marcel-Claude Braud Motor trolley with telescoping arm
JPH1120729A (en) * 1997-07-02 1999-01-26 Toyota Autom Loom Works Ltd Sensor mounting structure for vehicle
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DE19807849C2 (en) * 1998-02-25 1999-12-23 Jungheinrich Ag Pallet truck with adjustable support rollers
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WO2000017551A1 (en) * 1998-09-24 2000-03-30 Robert Bosch Gmbh Electromagnetically actuatable hydraulic proportional valve
EP1118581A1 (en) * 1999-05-07 2001-07-25 TCM Corporation Hydraulic-driven fork lift
JP3536785B2 (en) * 2000-06-06 2004-06-14 株式会社豊田自動織機 Travel control device for industrial vehicles

Also Published As

Publication number Publication date
US7121372B2 (en) 2006-10-17
DE60329347D1 (en) 2009-11-05
FR2837809A1 (en) 2003-10-03
AT443685T (en) 2009-10-15
US20030226705A1 (en) 2003-12-11
EP1348668A1 (en) 2003-10-01
FR2837809B1 (en) 2004-11-12

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