EP0943738B1 - Système de verrouillage hydraulique d'un outil de chargeur - Google Patents
Système de verrouillage hydraulique d'un outil de chargeur Download PDFInfo
- 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
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Images
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)
- Forklifts And Lifting Vehicles (AREA)
- Component Parts Of Construction Machinery (AREA)
Description
- la figure 1 est un schéma général représentatif de l'ensemble du système, appliqué à un chargeur monté sur un tracteur agricole, outil enlevé ;
- les figures 2, 3 et 4 sont des schémas similaires à la figure 1, avec l'outil en place, qui montrent des positions différentes du brancard, respectivement en position basse (de repos) (figure 2), en position légèrement relevée (figure 3), et en position haute (figure 4).
Claims (5)
- Système de verrouillage hydraulique apte à verrouiller un outil (O) sur le cadre porte-outil (2) d'un chargeur dont le levage du brancard (B) est commandé par un vérin hydraulique (1) - dit de levage - ledit système de verrouillage comportant au moins un verrou (32, 33), un autre vérin hydraulique (3) - dit de verrouillage - et une électrovanne (6), ces éléments étant aptes à être montés sur ledit chargeur, ledit verrou (32, 33) étant commandé par ledit vérin de verrouillage (3), lequel est susceptible d'être alimenté en liquide hydraulique pendant l'utilisation, via ladite électrovanne (6), à partir de la chambre de pression (100) du vérin de levage (1), de telle sorte que le déverrouillage de l'outil (O) n'est possible que si la pression hydraulique régnant dans cette chambre de pression (100) excède une valeur-seuil prédéterminée, caractérisé par le fait qu'il comporte une paire de verrous coaxiaux (32, 33) qui sont mobiles en translation, en sens opposés, et sont solidaires respectivement de la tige (30) et du cylindre (31) du vérin de verrouillage (3).
- Système selon la revendication 1, caractérisé par le fait qu'il comporte un système élastique (20) qui sollicite les verrous (32, 33) dans le sens du verrouillage, à l'encontre de la pression hydraulique du vérin de verrouillage (3).
- Système selon la revendication 1 ou 2, caractérisé par le fait que ledit vérin de verrouillage, (3) est à double effet, et que la pression différentielle dans ses deux chambres (300, 301) tend à le maintenir en extension, dans le sens du verrouillage.
- Système selon l'une des revendications 1 à 3, caractérisé par le fait que ladite électrovanne (6) est commandée électriquement au moyen d'un bouton-poussoir (70) encastré dans la paroi d'une poignée de commande (7), ce qui le rend difficile d'accès.
- Système selon l'une des revendications 1 à 4, caractérisé par le fait qu'il comporte un capteur (4) d'inclinaison du brancard (B) connecté électriquement à ladite électrovanne (6) de manière à interdire la commande du vérin de verrouillage en cas d'inclinaison excessive.
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 (fr) | 1999-09-22 |
EP0943738B1 true EP0943738B1 (fr) | 2003-12-17 |
Family
ID=9524391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990460015 Expired - Lifetime EP0943738B1 (fr) | 1998-03-18 | 1999-03-03 | Système de verrouillage hydraulique d'un outil de chargeur |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0943738B1 (fr) |
DE (1) | DE69913590T2 (fr) |
FR (1) | FR2776316B1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2381257B (en) * | 2001-10-26 | 2004-09-08 | Agco Gmbh & Co | Front loader |
EP1637659A3 (fr) * | 2001-12-06 | 2008-08-06 | Geith Patents Limited | Coupleur pour accoupler un accessoire à un bras de godet et système de commande pour un tel coupleur |
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 |
WO2012122469A1 (fr) * | 2011-03-10 | 2012-09-13 | Clark Equipment Company | Système de couplage d'outil pour machine électrique |
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)
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 |
-
1998
- 1998-03-18 FR FR9803563A patent/FR2776316B1/fr not_active Expired - Fee Related
-
1999
- 1999-03-03 DE DE1999613590 patent/DE69913590T2/de not_active Expired - Fee Related
- 1999-03-03 EP EP19990460015 patent/EP0943738B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69913590T2 (de) | 2004-09-30 |
FR2776316B1 (fr) | 2000-06-16 |
FR2776316A1 (fr) | 1999-09-24 |
DE69913590D1 (de) | 2004-01-29 |
EP0943738A1 (fr) | 1999-09-22 |
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