EP0391808A1 - Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader - Google Patents

Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader Download PDF

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Publication number
EP0391808A1
EP0391808A1 EP90400948A EP90400948A EP0391808A1 EP 0391808 A1 EP0391808 A1 EP 0391808A1 EP 90400948 A EP90400948 A EP 90400948A EP 90400948 A EP90400948 A EP 90400948A EP 0391808 A1 EP0391808 A1 EP 0391808A1
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EP
European Patent Office
Prior art keywords
cylinder
deployment
tool
articulated
discharge
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.)
Withdrawn
Application number
EP90400948A
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English (en)
French (fr)
Inventor
Jean Hugues Faivre
Philippe Champion
Henri Dupré
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.)
FDI- SAMBRON SA
Original Assignee
FDI- SAMBRON SA
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 FDI- SAMBRON SA filed Critical FDI- SAMBRON SA
Publication of EP0391808A1 publication Critical patent/EP0391808A1/de
Withdrawn legal-status Critical Current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
    • B66F9/065—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 non-masted
    • B66F9/0655—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 non-masted with a telescopic boom
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/3405—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism
    • E02F3/3408—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism of the parallelogram-type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
    • E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling

Definitions

  • the invention relates to a telescopic lifting structure for a machine such as a self-propelled loader.
  • telescopic loader arm essentially consisting of at least one telescopic loader arm (single or double) articulated to the chassis of the machine.
  • a tool such as a bucket, palletizer, jib, backfill blade, sweeper, bucket, rake rake or other is articulated at the free end of the loader arm.
  • the telescopic arm comprises at least two segments, the first of which is associated articulated with but integral with the chassis and the other of which slides inside the first under the action of a deployment cylinder disposed inside the and supported on the first segment.
  • the tool is articulated at the free end of the second sliding segment and its attitude can be adjusted under the action of a tilting cylinder bearing on the second sliding segment and whose actuating rod is mechanically connected to the tool. Furthermore, the inclination of the telescopic loader arm is adjustable by means of a lifting cylinder bearing on the chassis and mechanically connected to the first segment of this arm.
  • the outlet chamber of the lifting cylinder is directly connected to the inlet chamber of the discharge cylinder placed at the end of the second sliding segment.
  • the volume of fluid displaced in the outlet chamber of the lifting cylinder is fully transmitted, by the hydraulic connection, to the inlet chamber of the discharge cylinder.
  • the lifting cylinder generally has to develop a greater force than the dumping cylinder.
  • a fourth metering cylinder placed parallel to the lifting cylinder, but dimensioned similarly to the dumping cylinder to which it is hydraulically connected in the same way as the lifting cylinder in the first. aforementioned variant.
  • the metering cylinder then follows the lifting cylinder in the tilting movement and the volume of fluid displaced in its outlet chamber is fully transmitted to the inlet chamber of the discharge cylinder which is thus automatically controlled.
  • This second solution nevertheless has the disadvantage of requiring an additional cylinder which increases the final cost of the structure.
  • the presence of the discharge cylinder at the head of the loader arm means that the telescopic loader arm must be dimensioned accordingly, which has the consequence of making the structure heavier and increasing its cost price.
  • the external connecting pipes between the two cylinders are subjected to bad weather and to shocks and wear, in particular because they extend in the immediate vicinity of the tool.
  • hydraulic compensation is not considered to be strong enough for important works such as earthworks.
  • the present invention aims to remedy these drawbacks and aims to propose a lifting structure with a telescopic arm: - with which the adjustment of the attitude of the tool is carried out automatically in a proportional manner over the entire lifting stroke and this in a simple and economical manner.
  • the different cylinders, the loader arm and the motorization are only dimensioned as a function of mechanical constraints, and therefore independently of the requirements for correcting the attitude of the tool - which does not require the presence of an additional metering cylinder - whose discharge cylinder is not placed at the head of the loader arm, but on the contrary as close as possible to the articulation of this arm to the chassis - which does not have hydraulic connection lines in the vicinity of the tool.
  • - which is of sufficient strength and reliability, in particular equivalent to that of non-telescopic structures, to ensure important work such as earthworks.
  • the present invention aims to propose such a lifting structure whose performance-to-weight and performance-to-cost ratios (cost price and operating costs) are higher than those of known structures.
  • the invention provides a lifting structure for a machine such as a loader comprising at least one telescopic loader arm consisting of at least two segments, the first of which is articulated by one of its ends to the chassis of the machine. so as to be able to pivot at least in a vertical plane around a horizontal pivot axis under the action of a lifting cylinder, and the second of which slides along an axis of deployment / retraction relative to the first under the action a deployment cylinder, the structure also comprising an associated tool articulated at the free end of the loader arm so as to be able to pivot at least in said vertical plane around a horizontal pivot axis under the action of a cylinder discharge, characterized in that it comprises a mechanical system of articulated connecting rods and levers making it possible to automatically maintain constant the attitude of the tool during modifications of the inclination of the load arm r, and in that the discharge and deployment jacks are hydraulically connected so as to automatically maintain constant the attitude of the tool during deployment and during the retraction of the
  • the discharge cylinder is integrated into the mechanical system, its cylinder being articulated and bearing on a first member of this mechanical system, its actuating rod being articulated to a second member of the mechanical system, so that this cylinder constitutes a connecting rod variable length for this mechanical system.
  • the first member is associated with the first segment of the loader arm
  • the second member is associated with the structure near the tool
  • the discharge cylinder extends at least substantially parallel to the deployment cylinder
  • the cylinder travel stroke discharge corresponds to that of the deployment cylinder increased by the stroke necessary for the pivoting movements of the tool in each extreme deployed and retracted position of the loader arm and of the deployment cylinder.
  • Said first member is a first lever articulated at the first segment around a horizontal pivot axis
  • said second member is a second lever articulated at the free end of the loader arm around a horizontal pivot axis.
  • the first lever is connected to the pivot axis connecting the lifting cylinder to the frame of the structure by a first connecting rod articulated to this first lever and to this axis.
  • the second lever is connected to the tool by means of a second link articulated to this second lever and to this tool.
  • each of the deployment and discharge cylinders is a double-acting cylinder controlled from a double inlet / outlet valve connected to the inlet and outlet chambers of this jack by a control circuit; the discharge cylinder is mounted in series in the control circuit of the deployment cylinder; and the control valve of the discharge cylinder is connected directly in parallel to the chambers of this cylinder.
  • the two chambers respectively of the discharge cylinder and the redeployment cylinder which are directly connected to each other, both both have the same section.
  • the discharge cylinder and the deployment cylinder are provided with flow regulating valves avoiding any offset between these cylinders, which would be due for example to cavitation phenomena.
  • the automatic compensation of the trim of the tool is carried out mechanically by the mechanical system during modifications of the inclination of the loader arm, and hydraulically by the hydraulic connections between the discharge cylinder and the cylinder deployment when changing the length of the telescopic loader arm.
  • the invention also relates to a self-propelled loader characterized in that it is equipped with a lifting structure according to the invention.
  • FIG. 1 The figures show a self-propelled loader 1 equipped with a lifting structure with telescopic arm according to the invention.
  • a loader 1 comprises a chassis 3 - in particular in several articulated parts - supporting a plurality of axles and wheels or tracks 4, a station or a cockpit 5, and a powertrain 6 capable of supplying a control fluid under pressure - in particular oil - intended for the different cylinders allowing the functioning of the lifting structure 2.
  • the lifting structure 2 comprises at least one telescopic loader arm 7 consisting of at least two segments 7a, 7b of which the first 7a is articulated by an 8 of its ends 8, 9 to the chassis 3 of the machine 1 so as to be able to pivot at least in a vertical plane around a horizontal pivot axis 10 under the action of a lifting cylinder 11.
  • This lifting cylinder 11 is articulated by its cylinder 13 to the chassis 3 around a horizontal pivot axis 12 located at a distance from and at a level lower than the horizontal pivot axis 10 connecting the first segment 7a to the chassis 3.
  • the free end 14 of the actuating rod 15 of the lifting cylinder 11 is also articulated under the first segment 7a about a horizontal pivot axis 16.
  • the second segment 7b of the loader arm 7 slides along a deployment / retraction axis 17 relative to the first segment 7a under the action of a deployment cylinder 18.
  • the deployment / retraction axis 17 is perpendicular to the axis of horizontal pivoting 10 for associating the first segment 7a with the chassis 3.
  • the cylinder 19 of this deployment cylinder 18 is rigidly associated with and bears on the bottom of the first segment 7a of the loader arm 7.
  • the actuating rod 21 of the cylinder deployment 18 is rigidly associated with an internal frame 22 of the second segment 7b.
  • the deployment cylinder 18 is therefore placed inside the first segment 7a which is hollow and controls the second segment 7b, also hollow, in its sliding for the deployment or retraction of the telescopic loader arm 7.
  • the second segment 7b enters the first segment 7a through the hollow free end of this first segment 7a.
  • the cross sections of these segments are in correspondence to allow them to slide relative to each other. Appropriate guide members, known in
  • the lifting structure 2 also comprises an associated tool 23 articulated at the free end 24 of the loader arm 7 so as to be able to pivot at least in said vertical plane around a horizontal pivot axis 25 under the action a discharge cylinder 26.
  • the free end 24 of the loader arm 7 to which the tool 23 is articulated is also the free end of the second segment 7b.
  • the tool 23 may consist of a bucket, a palletizing fork, a jib, a backfill blade, a sweeper, a bucket, a swather rake, or the like. In Figures 1 to 3 the tool 23 has been shown in the form of a palletizing fork.
  • the tool 23 shown is a bucket.
  • the tool 23 is articulated at the free end 24 of the loader arm 7 by means of a rapid adaptation mechanism 27 known per se, making it possible to interchange the tool 23.
  • the tool 23 is connected to the free end 28 of the actuating rod 29 of the discharge cylinder 26, in particular by means of a connecting rod 33, a lever 32, and the adaptation mechanism 27.
  • the lifting cylinder 11 is a double-acting cylinder and makes it possible to modify the inclination of the loader arm 7 relative to the horizontal, in the direction of lifting or in that of lowering.
  • the deployment cylinder 18 is a double-acting cylinder, and allows the modification of the length of the telescopic loader arm 7 in the direction of deployment or in that of retraction.
  • the discharge cylinder 26 is a double-acting cylinder, and makes it possible to pivot the tool 23 about its horizontal pivot axis 25 in the direction of the discharge, or in that of the loading.
  • the cylinders 11, 18, 26 lifting, deployment and dumping also allow the maintenance of the lifting structure 2 in a determined position.
  • the lifting structure 2 can comprise a single telescopic loader arm 7 as shown, or a plurality of parallel loader arms 7 actuated simultaneously by the different jacks 11, 18, 26.
  • the different segments 7a, 7b constituting each arm loader 7 are mechanically connected to each other by crosspieces, and the deployment cylinder 18 is not disposed inside a loader arm 7, but on the contrary in the middle position between each of the loader arms 7.
  • the lifting structure 2 with telescopic arm is characterized in that it comprises a mechanical system 30, 31, 32, 33 of articulated connecting rods and levers making it possible to automatically keep the attitude of the tool 23 constant when modifications of the inclination of the loader arm 7 under the action of the lifting cylinder 11, and in that the discharge and deployment cylinders 26 and 18 are hydraulically connected so as to automatically maintain constant the attitude of the tool 23 during the deployment and retraction of the telescopic loader arm 7, while allowing, if necessary, the pivoting of this tool 23 about its axis 25 under the action of the discharge cylinder 26 in the direction of loading or discharge .
  • the discharge cylinder 26 is integrated into the mechanical system 30, 31, 32, 33.
  • the cylinder 34 of the discharge cylinder 26 is articulated and bears on a first member 31 of this mechanical system.
  • the actuating rod 29 of the discharge cylinder 26 is articulated to a second member 32 of this mechanical system.
  • this discharge cylinder 26 constitutes a connecting rod of variable length for this mechanical system, and connects said first member 31 and second member 32.
  • the discharge cylinder 26 has a double function: firstly it connects the two members 31, 32 of the mechanical system by allowing automatic compensation of the trim of the tool 33 when the inclination of the loader arm is modified; moreover, it makes it possible to pivot the tool 23 about its axis 25 when it is actuated.
  • the discharge cylinder 26, hydraulically linked to the deployment cylinder 18, sees its length automatically modified subsequently, due to its hydraulic connection. with the deployment cylinder 18. In this way, the trim of the tool 23 is also preserved during the deployment or retraction of the loader arm 7.
  • said first member 31 is associated with the first segment 7a of the loader arm 7
  • said second member 32 is associated with the structure 2 near the tool 23
  • the discharge cylinder 26 extends at least substantially parallel to the deployment cylinder 18, and the travel stroke of the discharge cylinder 26 corresponds to that of the deployment cylinder 18 increased by the travel necessary for the pivoting movements of the tool 23 in each extreme deployed and retracted position of the loader arm 7 and of the deployment cylinder 18.
  • the travel of travel of the two discharge cylinders 26 and deployment 18 are similar during the deployment and retraction maneuvers, and, in each extreme position, the pivoting of the tool 23 around of its axis 25 can be controlled by the discharge cylinder 26.
  • said first member 31 is a first lever 31 articulated to the first segment 7a of the loader arm 7 about a horizontal pivot axis 36.
  • This horizontal pivot axis 36 is mounted on the first segment 7a, in particular on its upper face 37.
  • the first lever 31 extends on either side from this pivot axis 36. It therefore comprises a first arm 38 which extends generally upwards from the pivot axis 36, and whose free end 39 is associated articulated with the cylinder 34 of the discharge cylinder 26 about a horizontal pivot axis 40.
  • this first lever 31 also includes a second arm 41 extending generally downward from the pivot axis 36 of the first lever on the first segment 7a of the loader arm 7.
  • Said first lever 31 is connected to the pivot axis 12 connecting the lifting cylinder 11 to the chassis 3 of the structure 2 by a first connecting rod 30 articulated to this first lever 31 by a 42 of the ends of this connecting rod 30 and to this pivot axis 12 by its other end 43.
  • the end 42 of the first connecting rod 30 associated articulated to the first lever 31 is articulated at the free end 44 of the second arm 41 of the first lever 31 about a horizontal pivot axis 45.
  • said second member 32 is a second lever articulated at the free end 24 of the loader arm 7 around a horizontal pivot axis 46.
  • This pivot axis 46 of the second lever 32 is located on the loader arm 7 slightly set back relative to the pivot axis 25 of the tool 23.
  • the second lever 32 extends generally upwards from its axis pivoting 46 relative to the loader arm 7.
  • the actuating rod 29 of the discharge cylinder 26 is articulated by its free end 28 in the middle part of the second lever 32 about a horizontal pivot axis 47.
  • the second lever 32 is connected to the tool 23, in particular via the adaptation mechanism 27, by means of a second connecting rod 33.
  • This second connecting rod 33 is articulated by a 48 of its ends at the free end 49 of the second lever 32 about a horizontal pivot axis 50. Furthermore, this second connecting rod 33 is also articulated by its other end 51 to the adaptation mechanism 27 of the tool 23 around a horizontal pivot axis 52. This horizontal pivot axis 52 is disposed substantially above the pivot axis 25 of the tool 23 and its adaptation mechanism 27 relative to the loader arm 7. Thus, the adaptation mechanism 27, and therefore the tool 23 is held and controlled in position relative to the pivot axis 25 by the discharge cylinder 26 via the second lever 32 and the second connecting rod 33.
  • the pivot axis 36 of the first lever 31 relative to the first segment 7a of the loader arm 7 is located substantially in the middle part of this first segment 7a.
  • the pivot axis 40 of the first lever 31 on the cylinder 34 of the discharge cylinder 26 is located substantially in the middle part of this cylinder 34.
  • the first connecting rod 30 extends generally at least substantially parallel to the cylinder lifting 11 between the pivot axis 12 which connects it to the chassis 3, and the pivot axis 45 which connects it to the first lever 31.
  • the lifting cylinder 11 and the first connecting rod 30 extend under the first segment 7a of the loader arm 7.
  • the discharge cylinder 26 extends above this first segment 7a, and the second lever 32 and the second connecting rod 33 extend above the free end 24 of the loader arm 7.
  • the first lever 31 extends substantially transversely to the first segment 7a to connect the first connecting rod 30 to the discharge cylinder 26.
  • the mechanical system 30, 31, 32, 33 can be simple, as described above, or split, like the loader arm 7. It is thus possible to provide two simple systems on either side of each loader arm 7, and of which the respective elements in correspondence are connected to each other transversely.
  • the mechanical connections to the pivot axis mentioned above can be made by any suitable known means: bearings, yokes, bearings, etc.
  • each of the deployment cylinders 18 and discharge 26 is a double-acting cylinder controlled from a valve 53, 54 double inlet / outlet distributor connected to the inlet chambers 55, 56 and outlet 57, 58 of this cylinder 18, 26 by a hydraulic control circuit 59, 60.
  • the discharge cylinder 26 is mounted in series in the control circuit 59 of the deployment cylinder 18, and the valve 54 of control of the discharge cylinder 26 is connected directly in parallel to the chambers 56, 58 of this discharge cylinder 26.
  • the mounting of the hydraulic circuits 59, 60 is illustrated in FIG. 5.
  • the inlet chamber 56 of the discharge cylinder 26 is directly connected by a conduit 61 to a first terminal 62 of the valve 54.
  • the outlet chamber 58 of this same discharge cylinder 26 is directly connected to the other terminal 63 of the valve 54 by another conduit 64.
  • the outlet chamber 57 of the deployment cylinder 18 is directly connected to a first terminal 65 of the valve 53 by a conduit 66.
  • the other terminal 67 of this valve 53 is connected by a conduit 68 to the conduit 61 connecting the inlet chamber 56 of the discharge cylinder 26 to the valve 54.
  • the inlet chamber 55 of the deployment cylinder 18 is connected by a line 69 to line 64 connecting the outlet chamber 58 of the discharge cylinder 26 to the valve 54.
  • the valves 53, 54 are designed such that when pressurized fluid passes through one 65, 63 of their terminal in one direction, the fluid passes through the other terminal 67, 62 in the other direction.
  • the two cylinders 26, 18 are mounted in series.
  • the outlet chamber 58 of the discharge cylinder 26 is connected by the conduits 64, 69 to the inlet chamber 55 of the deployment cylinder 18.
  • the two chambers 58, 55 respectively of the discharge cylinder 26 and the deployment cylinder 18 which are directly connected to one another, in particular by the conduits 64, 69, both have the same section.
  • the valve 54 distributing the discharge cylinder 26 is placed in the neutral position. In this case, the terminals 62, 63 of this valve are closed.
  • the hydraulic fluid is sent through terminal 65 of the valve 53 distributing the deployment cylinder 18, by the conduit 66 in the outlet chamber 57 of this cylinder 18.
  • the displacement of the piston 70 of this cylinder 18 discharges the hydraulic fluid from the inlet chamber 55 through the conduits 69, 64 connecting it to the outlet chamber 58 of the discharge cylinder 26.
  • the piston 71 of the discharge cylinder 26 is therefore also displaced and discharges the hydraulic fluid from the inlet chamber 56 via the conduits 61 and 68 to the terminal 67 of the valve 53 distributing the deployment cylinder 18.
  • valve 53 distributing the deployment cylinder 18 is placed in the neutral position, its terminals 65, 67 being closed.
  • the hydraulic fluid is sent by the distributor valve 54 to one or other of the inlet or outlet chambers 56, 58 of this jack 26 in order to actuate it in a conventional manner.
  • the cylinders which equip the lifting structure 2, and in particular the discharge cylinder 26 and the deployment cylinder 18 are provided with flow control valves 72 avoiding any shift between these cylinders which could occur due to the phenomena cavitation.
  • valves 53, 54 distributors can be controlled from the cockpit 5 from two control levers or even a single lever if these valves 53, 54 are coupled. They advantageously consist of solenoid valves.
  • the invention also relates to a self-propelled loader 1 characterized in that it is equipped with a lifting structure 2 according to the invention.
  • each loader arm 7 consists only of two telescopic segments 7a, 7b.
  • a larger number of segments risks making the lifting structure 2 insufficiently resistant for important work such as earthworks.
  • the lifting structure 2 according to the invention has been found to be of sufficient strength to be applied to a loader 1.
  • the invention can be used in other applications , in particular on other types of machinery of the public works type, self-propelled or not, when the same technical problems are encountered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Operation Control Of Excavators (AREA)
EP90400948A 1989-04-07 1990-04-06 Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader Withdrawn EP0391808A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904602A FR2645520B1 (fr) 1989-04-07 1989-04-07 Structure de levage telescopique pour un engin tel qu'une chargeuse
FR8904602 1989-04-07

Publications (1)

Publication Number Publication Date
EP0391808A1 true EP0391808A1 (de) 1990-10-10

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EP90400948A Withdrawn EP0391808A1 (de) 1989-04-07 1990-04-06 Teleskopische Hebevorrichtung für ein Fahrzeug, insbesondere für einen Lader

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EP (1) EP0391808A1 (de)
FR (1) FR2645520B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266291A (en) * 1992-04-20 1993-10-27 Caterpillar Inc Linkage for material handling device.
WO2003013999A2 (en) * 2001-08-03 2003-02-20 The Government Of The United States Of America, As Represented By The Secretary Of The Department Of Health And Human Services, Centers For Disease Control And Prevention Mobile load handling apparatus
EP2189577A1 (de) * 2008-11-20 2010-05-26 Mailleux Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes
CN104153418A (zh) * 2014-08-26 2014-11-19 广西大学 一种机械滑轨式双驱动电动挖掘机
US11168712B2 (en) 2019-02-22 2021-11-09 Clark Equipment Company Hydraulic leveling circuit for power machines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878598A (en) * 1954-06-22 1959-03-24 John S Pilch Detachable bulldozer
US3856163A (en) * 1972-07-17 1974-12-24 Case Co J I Method of using a hydraulic leveling circuit on an implement
US4344734A (en) * 1980-05-23 1982-08-17 J. I. Case Company Self-leveling bucket linkage
US4364705A (en) * 1980-07-07 1982-12-21 J. I. Case Company Loader mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878598A (en) * 1954-06-22 1959-03-24 John S Pilch Detachable bulldozer
US3856163A (en) * 1972-07-17 1974-12-24 Case Co J I Method of using a hydraulic leveling circuit on an implement
US4344734A (en) * 1980-05-23 1982-08-17 J. I. Case Company Self-leveling bucket linkage
US4364705A (en) * 1980-07-07 1982-12-21 J. I. Case Company Loader mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266291A (en) * 1992-04-20 1993-10-27 Caterpillar Inc Linkage for material handling device.
GB2266291B (en) * 1992-04-20 1995-09-27 Caterpillar Inc Linkage for loader bucket or other material handling device
WO2003013999A2 (en) * 2001-08-03 2003-02-20 The Government Of The United States Of America, As Represented By The Secretary Of The Department Of Health And Human Services, Centers For Disease Control And Prevention Mobile load handling apparatus
WO2003013999A3 (en) * 2001-08-03 2003-05-22 Us Gov Health & Human Serv Mobile load handling apparatus
EP2189577A1 (de) * 2008-11-20 2010-05-26 Mailleux Automatische Ausrichtung des Werkzeuges eines an einem Traktor montierten Hubgerüstes
CN104153418A (zh) * 2014-08-26 2014-11-19 广西大学 一种机械滑轨式双驱动电动挖掘机
US11168712B2 (en) 2019-02-22 2021-11-09 Clark Equipment Company Hydraulic leveling circuit for power machines

Also Published As

Publication number Publication date
FR2645520A1 (fr) 1990-10-12
FR2645520B1 (fr) 1991-08-16

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