EP0943738B1 - Hydraulisches Verriegelungssystem für ein Laderwerkzeug - Google Patents

Hydraulisches Verriegelungssystem für ein Laderwerkzeug Download PDF

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Publication number
EP0943738B1
EP0943738B1 EP19990460015 EP99460015A EP0943738B1 EP 0943738 B1 EP0943738 B1 EP 0943738B1 EP 19990460015 EP19990460015 EP 19990460015 EP 99460015 A EP99460015 A EP 99460015A EP 0943738 B1 EP0943738 B1 EP 0943738B1
Authority
EP
European Patent Office
Prior art keywords
locking
actuator
tool
hydraulic
solenoid valve
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 - Lifetime
Application number
EP19990460015
Other languages
English (en)
French (fr)
Other versions
EP0943738A1 (de
Inventor
Loic Mailleux
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.)
Mailleux SA
Original Assignee
Mailleux 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 Mailleux SA filed Critical Mailleux SA
Publication of EP0943738A1 publication Critical patent/EP0943738A1/de
Application granted granted Critical
Publication of EP0943738B1 publication Critical patent/EP0943738B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3631—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with a hook and a transversal locking element
    • 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
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated

Definitions

  • the present invention relates to a hydraulic locking system able to lock a tool on the tool holder frame of a front loader, including lifting the stretcher is controlled by a hydraulic jack, called a lifting cylinder.
  • a hydraulic locking system for an excavator is disclosed in document US-A-5727342. Unlocking this shovel is only possible in a specific position and is exerted by a single acting cylinder.
  • the invention aims to solve these problems, for a front loader.
  • the system which is the subject of the present invention comprises at least minus a lock, another hydraulic cylinder - called lock - and a solenoid valve, these elements being able to be mounted on said charger, said lock being controlled by said locking cylinder, which is capable of being supplied with hydraulic fluid during use, via said solenoid valve, from the cylinder pressure chamber lifting, so that unlocking of the tool is only possible if the pressure hydraulic system in this pressure chamber exceeds a threshold value predetermined. It includes a pair of coaxial locks which are movable in translation, in opposite directions, and are secured respectively to the rod and to the cylinder of the actuator locking.
  • said solenoid valve is electrically controlled by means of a push button embedded in the wall of a control handle, this which makes it difficult to access.
  • the system includes a stretcher tilt sensor electrically connected to said solenoid valve so as to prohibit the control of the locking cylinder in the event of tilting excessive.
  • This arrangement eliminates the risk of the tool stalling when it found in high position.
  • an agricultural tractor equipped with the reference T has been designated a front loader C comprising, in the usual manner, an articulated stretcher B provided with its front end of a tool holder frame 2.
  • the loader has a pair of lifting cylinders 1 (only one of which is visible in the front view corresponding to the diagram), which make it possible to pivot the stretcher B around its axis of articulation X to cause lifting or lowering of the tool carried by the frame 2.
  • the tool is not shown in Figure 1. In the following figures, it is a bucket, designated O.
  • It also includes a VB tipping cylinder allowing the tool to pivot relative to the stretcher.
  • the lifting cylinder 1 is double-acting. It comprises a piston 10 secured to the frame of the loader, and a cylinder 11 secured to the stretcher B.
  • the tractor T is equipped with low and high pressure hydraulic sources, respectively BP (atmospheric pressure) and HP (pressure of the order of 15.10 7 to 2.10 7 Pa).
  • BP atmospheric pressure
  • HP pressure of the order of 15.10 7 to 2.10 7 Pa.
  • Line 8 corresponds to the supply of high pressure liquid, and line 9 when returning to the tank (low pressure line).
  • the conduits 8, 9 are connected, via a three-position control valve 5, on the one hand to the small chamber 101 (side of the piston rod 10) of the jack 1, on the other hand to its large chamber 100.
  • This will be conventionally designated in the following description and in the claims "pressure chamber”. It is, in fact, the bringing of the pressurized liquid into this chamber 100 which causes the extension of the jack and the lifting of the tool.
  • connections between the distributor 5 and the chambers 100 and 101 are referenced respectively 80-80 'and 90.
  • the tool holder frame 2 which is shown even from the side on the right of the figures, comprises in the upper part, two semi-cylindrical housings 21 in which can engage appropriate pins provided on the tool.
  • a pair of latches in the form of horizontal, coaxial rods 32, 33. They are carried by a jack hydraulic 3, arranged transversely, the cylinder of which is designated 31 and the piston 30.
  • One 32 of the locking rods is fixed in the extension of the piston rod 30, and the other 33 on the back of the cylinder 31.
  • a pair of coil springs 20 is constantly tensioning pushing the locks 32, 33 outwards, which corresponds to the extension of the cylinder 3, in a locked position. In this position, the free end portions locks engage in appropriate receiving openings provided on the tool.
  • high pressure liquid is brought into the small chamber 301 of the jack, while the large chamber is connected to the reservoir R (low pressure), which causes the jack to retract, and the retracting locks.
  • the value of the high pressure is sufficient to overcome the force of the springs 20.
  • the jack 3 is controlled by a control solenoid valve 6, with two positions.
  • the chamber 301 communicates with low pressure via conduits 81, 83. In the position shown in Figures 2 and 3, it communicates with the aforementioned line 80 '(connected to the chamber pressure cylinder 100).
  • the large chamber 300 of the jack 3 is permanently connected, by a conduit 82, to the reservoir. It is therefore always subjected to low pressure.
  • the solenoid valve 6 is controlled by an electric switch 700, itself actuated by a push button 70.
  • the push button 70 is embedded in the handle 7.
  • its support face of the finger is located at a level lower than the surface of the handle, which makes access difficult; the risk of it being pressed inadvertently is therefore practically zero.
  • To press it it is necessary, using your finger, to aim the opening in which it is embedded, which supposes a conscious and voluntary action on the part of the operator.
  • a tilt sensor 4 of the known type On the stretcher B is fixed a tilt sensor 4 of the known type. It is for example a mercury level switch, connected to the supply circuit of the solenoid valve 6. It is adjusted so that the circuit is closed when the height H 1 of the tool relative to the ground S is less than a determined height H 0 (situation illustrated in Figure 3), and open when this height H 2 is greater than H 0 ( Figure 4).
  • the value of the threshold height H 0 is preferably of the order of 1.50 m, less than the average height of a person.
  • the switch 700 is in the open state, which is its natural state.
  • the solenoid valve 6 is in the state of FIG. 1, so that the two chambers 300, 301 of the jack 3 are connected to the tank R and are at the bottom. pressure.
  • the tool O is kept locked on the frame 2 by means of the two locks 32, 33 which are subjected to the sole action of the springs 20.
  • the cylinder is therefore requested in extension, in the locking direction, this which eliminates the risk of accidental unlocking.
  • the pressure in the chamber 100 of the lifting cylinder 1 is therefore low.
  • the chamber 301 of the unlocking cylinder 3 is thus placed in communication, via conduits 81 and 80 ', with chamber 100. However, the latter being under low insufficient pressure to overcome the springs 20, the jack 3 remains in extension, and the unlocking cannot take place.
  • the tilt sensor 4 comes into action, keeping the supply circuit of the solenoid valve 6 open. It therefore remains in its natural state, in which the chamber 301 of the locking cylinder is subjected to low pressure. Unlocking is impossible. Thus, there is no risk of accident which could result from the presence of a person under the tool O at the time of its stall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (5)

  1. System für eine hydraulische Verriegelung, mit dessen Hilfe ein Werkzeug (O) am Rahmen eines Werkzeugträgers (2) einer Beladevorrichtung befestigt werden kann, und in dem die Trägerplatte (B) durch einen Hydraulikzylinder (1) - den sogenannten Zylinder für die Anhebung - betätigt wird, wobei dieses Verriegelungssystem mindestens einen Riegel (32, 33), und einen weiteren Hydraulikzylinder (3) - einen sogenannten Verriegelungszylinder - und einen Schaltschütz (6) enthält, wobei diese Elemente an dieser Beladevorrichtung montiert werden können, und der Riegel (32, 33) durch den Hydraulikzylinder für die Verriegelung (3) betätigt wird, der während der Benutzung über den Schaltschütz (6) aus einer Druckkammer (100) des Hydraulikzylinders für die Anhebung mit einer hydraulischen Flüssigkeit so versorgt wird, dass die Entriegelung des Werkzeugs (O) nur dann möglich ist, wenn der hydraulische Druck in dieser Druckkammer (100) einen vorbestimmten Schwellenwert überschreitet,
    dadurch gekennzeichnet, dass
    das System zwei koaxiale Riegel (32, 33) enthält, die in entgegengesetzter Richtung seitlich verschoben werden können, und jeweils an der Stange (30) des Zylinders (31) des Verriegelungszylinders (3) befestigt sind.
  2. System für eine hydraulische Verrieglung nach Anspruch 1,
    dadurch gekennzeichnet, dass
    es ein elastisches System (20) enthält, mit dessen Hilfe die Verriegelungen (32, 33) in Richtung der Verriegelung entgegen dem hydraulischen Druck des Zylinders für die Verriegelung beaufschlagt wird.
  3. System für eine hydraulische Verriegelung nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet, dass
    der Zylinder für die Verriegelung (3) eine Doppelwirkung hat und dass der Druckunterschied in diesen beiden Kammern (300, 301) geeignet ist, ihn in Richtung der Verriegelung gespannt zu halten.
  4. System für eine hydraulische Verriegelung nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    der Schaltschütz (6) elektrisch mit Hilfe eines Betätigungsknopfes (70) betätigt wird, der in die Wand eines Betätigungshebels (7) eingelassen ist, und der daher nur schwer erreichbar ist.
  5. System für eine hydraulische Verriegelung nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass
    dieses System einen Messfühler (4) für den Neigungswinkel der Trägerplatte (B) enthält, der elektrisch an den Schaltschütz (6) so angeschlossen ist, dass die Betätigung des Verriegelungszylinders im Falle eines zu großen Neigungswinkels nicht möglich ist.
EP19990460015 1998-03-18 1999-03-03 Hydraulisches Verriegelungssystem für ein Laderwerkzeug Expired - Lifetime EP0943738B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803563 1998-03-18
FR9803563A FR2776316B1 (fr) 1998-03-18 1998-03-18 Systeme de verrouillage hydraulique d'un outil de chargeur

Publications (2)

Publication Number Publication Date
EP0943738A1 EP0943738A1 (de) 1999-09-22
EP0943738B1 true EP0943738B1 (de) 2003-12-17

Family

ID=9524391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990460015 Expired - Lifetime EP0943738B1 (de) 1998-03-18 1999-03-03 Hydraulisches Verriegelungssystem für ein Laderwerkzeug

Country Status (3)

Country Link
EP (1) EP0943738B1 (de)
DE (1) DE69913590T2 (de)
FR (1) FR2776316B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2381257B (en) * 2001-10-26 2004-09-08 Agco Gmbh & Co Front loader
DE60215289T2 (de) * 2001-12-06 2007-05-24 Geith Patents Ltd. Werkzeugschnellkupplung zum Kuppeln eines Anbauteils an einen Baggerarm und die Werkzeugschnellkupplung umfassend ein Steuerungssystem
DE10221942A1 (de) * 2002-05-17 2003-12-04 Deere & Co Vorrichtung zum Festlegen eines Werkzeugs an einem Hubwerk
SE524668C2 (sv) * 2003-01-30 2004-09-14 Oilquick Ab Redskapsfäste med omkopplingsorgan
IES20040194A2 (en) 2003-09-18 2005-03-23 Caroline Mccormick An excavator tool quick attachment device
FR2869055B1 (fr) * 2004-04-14 2006-07-07 Etude Et D Innovation Dans Le Cadre porte-outil a caractere polyvalent pour chargeur, notamment a usage agricole.
DE102005033535A1 (de) 2005-07-14 2007-01-18 Deere & Company, Moline Hydraulische Anordnung
FR2900170A1 (fr) * 2006-04-21 2007-10-26 Innovation Equipement Sarl Dispositif d'accouplement hydraulique d'un godet au bout d'un bras de pelleteuse par verrouillage, deverrouillage lateral
US9334623B2 (en) 2011-03-10 2016-05-10 Clark Equipment Company Implement coupling system for a power machine
GB201322858D0 (en) * 2013-12-23 2014-02-12 Jc Bamford Excavators Ltd A disarm device for a working machine hitch arrangement, and working machine hitch arrangement and a working arm of a working machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268101A (en) * 1961-03-27 1966-08-23 Allis Chalmers Mfg Co Side dump bucket
DE2511819C3 (de) * 1975-03-18 1978-10-19 Liebherr-Hydraulikbagger Gmbh, 7951 Kirchdorf Hydraulikbagger
US4726731A (en) * 1984-12-07 1988-02-23 Jones Paul O Hitch
GB9005074D0 (en) * 1990-03-07 1990-05-02 Aubrey Martin J Coupling
AT401785B (de) * 1994-03-02 1996-11-25 Wimmer Alois Ing Sicherheitseinrichtung an hydraulischen kolben-zylinder-einheiten
US5727342A (en) * 1996-04-18 1998-03-17 Wain-Roy, Inc. Hydraulic latch pin assembly for coupling a tool to a construction equipment

Also Published As

Publication number Publication date
DE69913590D1 (de) 2004-01-29
FR2776316B1 (fr) 2000-06-16
DE69913590T2 (de) 2004-09-30
EP0943738A1 (de) 1999-09-22
FR2776316A1 (fr) 1999-09-24

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