EP1774106B1 - Device for coupling a loader to a tractor - Google Patents

Device for coupling a loader to a tractor Download PDF

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Publication number
EP1774106B1
EP1774106B1 EP05775245A EP05775245A EP1774106B1 EP 1774106 B1 EP1774106 B1 EP 1774106B1 EP 05775245 A EP05775245 A EP 05775245A EP 05775245 A EP05775245 A EP 05775245A EP 1774106 B1 EP1774106 B1 EP 1774106B1
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EP
European Patent Office
Prior art keywords
coupling
catch
tractor
loader
members
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EP05775245A
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German (de)
French (fr)
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EP1774106A1 (en
Inventor
Loïc MAILLEUX
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Mailleux SA
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Mailleux SA
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    • 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
    • E02F3/627—Devices to connect beams or arms to tractors or similar self-propelled machines, e.g. drives therefor
    • 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
    • E02F3/627—Devices to connect beams or arms to tractors or similar self-propelled machines, e.g. drives therefor
    • E02F3/6273—Devices to connect beams or arms to tractors or similar self-propelled machines, e.g. drives therefor using legs to support the beams or arms on the ground during the connecting process
    • 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
    • E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms

Definitions

  • the present invention relates to a device for coupling a loader on a tractor.
  • a loader in particular a front loader, is a device intended to be mounted at the front of an agricultural tractor to perform all the handling tasks of various materials, such as, for example, straw, hay, manure or soil. .
  • the tractor T is equipped with a BA adapter frame which forms the interface between the loader and the tractor and whose shape is adapted to each tractor model.
  • This adapter frame BA supports two coupling heads 2, one on each side of the tractor.
  • the front loader C comprises, in the usual manner, an articulated B stretcher, provided at its front end with a tool holder frame CPO on which is mounted a tool O , here a bucket.
  • the stretcher B comprises two parallel arms. The rear end of each of these arms is provided with a hitch frame 1.
  • the loader C also includes a pair of lifting cylinders V (only one of which is visible in the front view corresponding to the figure 1 ) which makes it possible to pivot the two arms of the stretcher B about axes of articulation supported by the hitching frames 1.
  • Each hitch frame 1 constitutes the fixed part of the loader, intended to be attached to the coupling head 2 placed opposite
  • each coupling frame 1 of the loader C is hooked to the corresponding coupling head 2 of the tractor T by means of at least one pair of members complementary coupling, male and female.
  • the operator advances the tractor T towards the loader C which rests on the ground held by crutches BE.
  • the tractor continues its movement until the male or female members carried by the coupling frame 1 mate with the respective female or male members carried by the coupling head 2.
  • Locking means are then engaged, usually automatically to lock this coupling.
  • each coupling head of the tractor comprises two coupling cavities and a stop and each bracket of the loader comprises two bars intended to be received in said cavities and a latch urged by a spring.
  • the bars engage in the cavities and are locked in this position by the latch which cooperates with said stop.
  • each of the hitch frames of the charger is not necessarily rigorously facing the coupling means of each of the coupling heads.
  • the present invention therefore aims to provide a device for coupling a loader C on a tractor T may be pre-locked, so that the operator can connect the hydraulic connections and remove the crutches supporting the charger, without risk fall from it.
  • Another object of the invention is that once the coupling device is pre-locked, the operator can use the hydraulic controls to center the loader relative to the tractor and bring it to its final position in which it can then be locked. .
  • the invention relates to a coupling device of a loader on a tractor, the hitching frame of the loader being provided with one of the two male or female coupling members of each of two pairs of coupling members called “front” and “rear” and a latch biased by a spring, the coupling head of an adapter frame carried by said tractor being provided with two coupling members complementary to those worn by said coupling frame and locking means, said latch cooperating with said locking means to occupy a so-called “locking" position, wherein said male members are fully coupled with said female members.
  • said coupling head comprises pre-locking means with which said latch can cooperate to occupy a so-called "pre-locking" position, in which the male and female members of each pair are engaged incompletely, so that that the loader is hooked to the tractor but that there is a clearance between these male and female members allowing adjustment of the position of the loader relative to the tractor, the spring tending permanently to maintain said latch in the locking or pre-locking position .
  • the hitch frame 1 shown on the Figures 2 to 5 is the one that is intended to be attached to the right side of the tractor. It comprises two parallel flanges, spaced from each other, the flange located inward, that is to say facing the tractor bearing the reference numeral 10 and the other the reference 10 '.
  • the coupling head 2 has two ends, called “front” and “rear” with reference to the direction of travel of the tractor, referenced respectively 28 and 26.
  • Each of these U-shaped hands constitutes the female member of a pair of coupling members. Their concavity is oriented toward the front of the tractor. The central axis of their concave portion is perpendicular to the plane P.
  • the upper flange 23 of the coupling head 2 extends from an area above the hand before 21 to the entrance of the rear hand 22.
  • This flange 23 is a slightly inclined running ramp to the top from the front to the back of the head 2.
  • pre-locking notches Two notches 24, 24 ', called “pre-locking notches", are provided on either side of the running ramp 23, substantially at half the length of this ramp.
  • notches are symmetrical with respect to the vertical median plane P. They have a side view in the form of an open V upwards.
  • Two stops 25, 25 'called “locking stops” are also provided on either side of the rolling ramp 23. They are symmetrical with respect to the plane P.
  • stops 25 and 25 are arranged in the immediate vicinity of the notches 24, respectively 24', and between these notches and the rear hand 22.
  • the running ramp 23 has a thickness less than that of its front portion.
  • the portion of the ramp 23 narrower, located between these notches and stops is reference 230.
  • a recess 260 is formed on the outward facing face of the rounded rear end 26 of the coupling head 2. Its concavity is oriented towards the rear of the tractor. This recess is visible on the figures 7 and 8 .
  • the head 2 comprises under the hand before 21, a lateral guide roller 27 mounted idler about an axis 270 perpendicular to the plane P.
  • This guide roller 27 is slightly offset towards the inside of the tractor relative to the median plane P.
  • the hitch frame 1 will now be described in more detail.
  • the bar intended to mate with the front hand 21 is called the "front” bar and has the reference numeral 11
  • the bar intended to mate with the rear hand 22 is referred to as the "rear” bar and has the reference numeral 12.
  • Each bar 11 and 12 extend along respective axes X1-X'1 and X2-X'2 perpendicular to the plane of the flanges 10 and 10 '.
  • Each bar constitutes the male member of a pair of coupling members.
  • a spacer 13 extends between the two flanges 10 and 10 ', it is disposed substantially above the bar 12.
  • the hitch frame 2 further comprises a latch 14 pivotally mounted at one of its ends about an axis perpendicular to the plane of the two flanges 10 and 10 '.
  • the axis about which pivots this latch 14 is the rear bar 12.
  • this latch 14 consists of two half latches 140, 140 ', parallel, generally triangular in shape, the tip is oriented downwards.
  • Each half-latch 140 has a front end 142, a front face 144 and a rear end 143 pierced with an orifice 141 allowing the passage of the axis X2-X'2 of the bar 12.
  • the half-latch 140 ' has a same structure and the same elements bear the same numerical references plus the prime sign.
  • the two half latches 140 and 140 ' are further joined at their front ends 142, 142' by fastening means, such as a bolt 163 and a nut 164.
  • the structure of the bar 12 will now be detailed with reference to the figure 3 . It has the general shape of a coil.
  • Each conical portion 121, 121 ' is pierced with a central orifice allowing passage of the axis X2-X'2 and is welded to a flange 10, respectively 10'.
  • the cylindrical axis X2-X'2 is supported on one of the flanges and fixed on the other, for example by a screw 123, so as to be removable.
  • the latch 14 is permanently biased by a helical spring 15.
  • a rod 16 is interposed between the front ends 142, 142 'of the two half latches 140 and 140'. It extends in the vertical median plane P.
  • the spring 15 is fixed at its lower end to a fixing pin 150 which extends between the two flanges 10 and 10 ', perpendicular to them and at its upper end 152 to an orifice 61 formed in the rod 16 .
  • the spring 15 pulls on the upper end of the rod 16, which tends to permanently move the latch 14 downwards.
  • a lever 17 extends between the two flanges 10 and 10 'parallel to the plane P. It comprises two parallel arms, namely an outer arm 174' longer and a shorter inner arm 174.
  • This lever 17 is articulated about an axis of rotation 171 perpendicular to the plane P and mounted at its two ends between the two flanges 10 and 10 '.
  • an orifice for receiving one end of said axis of rotation 171 is formed in each of the flanges 10, 10 '.
  • This orifice is of substantially triangular shape with rounded angles and its dimensions are slightly greater than that of the ends of the axis 171.
  • the axis of rotation 171 is mounted between the two flanges 10 and 10 'so that its ends rest on the edges of said receiving holes and they can move with a slight clearance inside these orifices, as one can see it on the Figures 8C and 8D for example.
  • a rod 172 is fixed between the front ends of the two arms 174 and 174 ', perpendicular to the plane P. It passes through the oblong hole 162 of the rod 16 within which it can move. This oblong hole 162 allows a slight clearance between the lever 17 and the rod 16.
  • a second coil spring 18 is disposed parallel to the first spring 15. Its lower end is fixed to the pin 150 and its upper end to the rod 172. This spring 18 tends to bring the front end of the lever 17 permanently down, in the position illustrated on the figure 2 .
  • a rod 175 forming a stop for the lever 17 is fixed between the two flanges 10 and 10 ', perpendicular to them, under the part of the lever 17 which extends between its front end and the axis 171.
  • the outer arm 174 'of the lever 17 is provided at its rear end with a handle 170 which protrudes outwardly of the tractor, perpendicular to the plane P, out of the outer flange 10'.
  • the outer arm 174 'of the lever 17 has at its rear end, on its opposite side to that where is fixed the handle 170, a lug 173.
  • This lug is capable of cooperating with the recess 260 of the head of coupling 2 as will be described later.
  • the outer flange 10 ' has along its rear edge, in its upper part, a recess 101' which constitutes an abutment to the upward movement of the lever 17 and in its middle part, a cavity 100 '.
  • the latch 14 could be slidable instead of pivoting.
  • the idler roll 122 of the bar 12 begins to roll along the running ramp 23, the conical portions 121 and 21 'of the coil-shaped bar facilitating the alignment of the coupling frame 1 in the median plane P of the head coupling 2.
  • the bars 11 and 12 are introduced at the entrance of the U-shaped hands 21, respectively 22.
  • the hitch frame 1 of the loader is secured to the coupling head 2 of the tractor adaptation frame.
  • the latch 14 In this position, the latch 14 has returned to its original position oriented at the maximum downward.
  • the front faces 144, 144 'of the latch 14 then come into contact with the stops 25, respectively 25'.
  • the figure 8A corresponds to the figure 7F .
  • the operator lowers the lever 17 with the handle 170 and brings it down until the handle 170 is locked in the cavity 100 '.
  • the operator can then start to reverse the loader and the coupling head 2 to the right (arrow G).
  • the rim of the recess 260 acts on the pin 173 and drives it slightly backwards, which is possible because the axis of rotation 171 of the lever 17 is mounted with a certain clearance in the recesses 102 ' . This has the effect, on the other side of the lever, to release the handle 170 out of the cavity 100 '.

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Abstract

A device for couplng a loader to a tractor, wherein the hitching frame (1) of the loader is provided with two coupling projections (11, 12) or sockets (21, 22) and a latch (14) biased by a spring (15), the coupling head (2) of the tractor is provided with two complementary coupling members and locking means (25, 25'), and said latch (14) engages said locking means (25, 25') to lock the load onto the tractor. Said device is characterised in that the coupling head (2) includes pre-locking means (24, 24') engageable by said latch (14) in a pre-locking position in which said projections (11, 12) and sockets (21, 22) are not fully coupled, and the spring (15) continually urges said latch (14) into the locking or pre-locking position.

Description

La présente invention concerne un dispositif d'accouplement d'un chargeur sur un tracteur.The present invention relates to a device for coupling a loader on a tractor.

Un chargeur, notamment frontal, est un équipement destiné à être monté à l'avant d'un tracteur agricole pour effectuer toutes les tâches de manutention de matériaux divers, tels que par exemple de la paille, du foin, du fumier ou de la terre.A loader, in particular a front loader, is a device intended to be mounted at the front of an agricultural tractor to perform all the handling tasks of various materials, such as, for example, straw, hay, manure or soil. .

En se reportant à la figure 1 jointe, on peut voir un chargeur C et un tracteur T. Referring to the figure 1 attached, we can see a loader C and a tractor T.

Le tracteur T est muni d'un bâti d'adaptation BA qui constitue l'interface entre le chargeur et le tracteur et dont la forme est adaptée à chaque modèle de tracteur. Ce bâti d'adaptation BA supporte deux têtes d'attelage 2, une de chaque côté du tracteur.The tractor T is equipped with a BA adapter frame which forms the interface between the loader and the tractor and whose shape is adapted to each tractor model. This adapter frame BA supports two coupling heads 2, one on each side of the tractor.

Le chargeur frontal C comporte, de manière usuelle, un brancard B articulé, pourvu à son extrémité avant d'un cadre porte-outil CPO sur lequel est monté un outil O, ici une benne. Le brancard B comprend deux bras parallèles. L'extrémité arrière de chacun de ces bras est munie d'un cadre d'attelage 1.The front loader C comprises, in the usual manner, an articulated B stretcher, provided at its front end with a tool holder frame CPO on which is mounted a tool O , here a bucket. The stretcher B comprises two parallel arms. The rear end of each of these arms is provided with a hitch frame 1.

Le chargeur C comporte également une paire de vérins de levage V (dont un seul est visible sur la vue de face correspondant à la figure 1) qui permet de faire pivoter les deux bras du brancard B autour d'axes d'articulation supportés par les cadres d'attelage 1.The loader C also includes a pair of lifting cylinders V (only one of which is visible in the front view corresponding to the figure 1 ) which makes it possible to pivot the two arms of the stretcher B about axes of articulation supported by the hitching frames 1.

Chaque cadre d'attelage 1 constitue la partie fixe du chargeur, destinée à être accroché à la tête d'attelage 2 placée en regardEach hitch frame 1 constitutes the fixed part of the loader, intended to be attached to the coupling head 2 placed opposite

Dans les dispositifs d'accouplement connus de l'état de la technique, chaque cadre d'attelage 1 du chargeur C est accroché à la tête d'attelage 2 correspondante du tracteur T à l'aide d'au moins une paire d'organes d'accouplement complémentaires, mâle et femelle.In the coupling devices known from the state of the art, each coupling frame 1 of the loader C is hooked to the corresponding coupling head 2 of the tractor T by means of at least one pair of members complementary coupling, male and female.

Lors de l'utilisation, l'opérateur fait avancer le tracteur T en direction du chargeur C qui repose sur le sol maintenu par des béquilles BE. Le tracteur poursuit son déplacement jusqu'à ce que les organes mâle ou femelle portés par le cadre d'attelage 1 s'accouplent avec les organes respectivement femelle ou mâle portés par la tête d'attelage 2. Des moyens de verrouillage sont ensuite enclenchés, généralement automatiquement pour verrouiller cet accouplement.In use, the operator advances the tractor T towards the loader C which rests on the ground held by crutches BE. The tractor continues its movement until the male or female members carried by the coupling frame 1 mate with the respective female or male members carried by the coupling head 2. Locking means are then engaged, usually automatically to lock this coupling.

L'opérateur descend alors du tracteur pour effectuer les branchements du circuit hydraulique entre les vérins V du chargeur C et la source d'alimentation hydraulique portée par le tracteur T puis il enlève les béquilles BE. The operator then descends from the tractor to make the hydraulic circuit connections between the V cylinders of the charger C and the hydraulic power source carried by the tractor T and he removes the crutches BE.

Il peut ensuite commencer à soulever et utiliser le chargeur.He can then start lifting and using the charger.

On connaît ainsi d'après le document FR 2 571 452 , un dispositif d'accouplement automatique d'un chargeur frontal sur un tracteur.We thus know from the document FR 2 571 452 , an automatic coupling device of a front loader on a tractor.

Dans ce dispositif, chaque tête d'attelage du tracteur comprend deux cavités d'accouplement et une butée et chaque potence du chargeur comprend deux barreaux destinés à être reçus dans lesdites cavités et un loquet sollicité par un ressort.In this device, each coupling head of the tractor comprises two coupling cavities and a stop and each bracket of the loader comprises two bars intended to be received in said cavities and a latch urged by a spring.

Lors de l'assemblage du chargeur et du tracteur, les barreaux s'engagent dans les cavités et sont verrouillés dans cette position par le loquet qui coopère avec ladite butée.During the assembly of the loader and the tractor, the bars engage in the cavities and are locked in this position by the latch which cooperates with said stop.

Un dispositif d'accrochage similaire est décrit dans le document DE 36 30976 .A similar attachment device is described in the document DE 36 30976 .

Théoriquement, il serait souhaitable d'accoupler et de verrouiller le chargeur et le tracteur, de façon automatique et en une seule opération.Theoretically, it would be desirable to couple and lock the loader and the tractor automatically and in a single operation.

En pratique, cette opération est difficile à réaliser lorsque le chargeur C est placé sur un sol meuble ou de surface irrégulière car il est alors bancal ou mal positionné en hauteur par rapport au tracteur T. De ce fait, chacun des cadres d'attelage du chargeur ne se trouve pas forcément rigoureusement en regard des moyens d'accouplement de chacune des têtes d'attelage.In practice, this operation is difficult to perform when the loader C is placed on a loose soil or irregular surface because it is then wobbly or incorrectly positioned in height relative to the tractor T. Therefore, each of the hitch frames of the charger is not necessarily rigorously facing the coupling means of each of the coupling heads.

En conséquence, dans un certain nombre de cas, le chargeur C n'est pas correctement verrouillé sur le tracteur T et lorsque l'utilisateur commence à soulever le chargeur, celui-ci se décroche et tombe. Une telle chute peut être extrêmement dommageable pour le chargeur et également dangereuse pour un opérateur éventuellement présent à proximité.As a result, in a number of cases, the loader C is not properly locked on the tractor T and when the user starts to lift the loader, the latter unhooks and falls. Such a fall can be extremely damaging for the loader and also dangerous for an operator possibly present nearby.

La présente invention a donc pour but de fournir un dispositif d'accouplement d'un chargeur C sur un tracteur T susceptible d'être préverrouillé, de sorte que l'opérateur puisse brancher les connexions hydrauliques et enlever les béquilles soutenant le chargeur, sans risque de chute de celui-ci.The present invention therefore aims to provide a device for coupling a loader C on a tractor T may be pre-locked, so that the operator can connect the hydraulic connections and remove the crutches supporting the charger, without risk fall from it.

Un autre objectif de l'invention est qu'une fois le dispositif d'accouplement préverrouillé, l'opérateur puisse utiliser les commandes hydrauliques pour centrer le chargeur par rapport au tracteur et l'amener dans sa position définitive dans laquelle il peut ensuite être verrouillé.Another object of the invention is that once the coupling device is pre-locked, the operator can use the hydraulic controls to center the loader relative to the tractor and bring it to its final position in which it can then be locked. .

A cet effet, l'invention concerne un dispositif d'accouplement d'un chargeur sur un tracteur, le cadre d'attelage du chargeur étant muni de l'un des deux organes d'accouplement mâle ou femelle de chacune de deux paires d'organes d'accouplement dites "avant" et "arrière" et d'un loquet sollicité par un ressort, la tête d'attelage d'un bâti d'adaptation porté par ledit tracteur étant munie des deux organes d'accouplement complémentaires de ceux portés par ledit cadre d'attelage et de moyens de verrouillage, ledit loquet coopérant avec lesdits moyens de verrouillage pour occuper une position dite "de verrouillage", dans laquelle lesdits organes mâles sont complètement accouplés avec lesdits organes femelles.For this purpose, the invention relates to a coupling device of a loader on a tractor, the hitching frame of the loader being provided with one of the two male or female coupling members of each of two pairs of coupling members called "front" and "rear" and a latch biased by a spring, the coupling head of an adapter frame carried by said tractor being provided with two coupling members complementary to those worn by said coupling frame and locking means, said latch cooperating with said locking means to occupy a so-called "locking" position, wherein said male members are fully coupled with said female members.

Conformément à l'invention, ladite tête d'attelage comprend des moyens de préverrouillage avec lesquels ledit loquet peut coopérer pour occuper une position dite "de préverrouillage", dans laquelle les organes mâle et femelle de chaque paire sont engagés de façon incomplète, de sorte que le chargeur est accroché au tracteur mais qu'il existe un jeu entre ces organes mâles et femelles autorisant un ajustement de la position du chargeur par rapport au tracteur, le ressort tendant en permanence à maintenir ledit loquet dans la position de verrouillage ou de préverrouillage.According to the invention, said coupling head comprises pre-locking means with which said latch can cooperate to occupy a so-called "pre-locking" position, in which the male and female members of each pair are engaged incompletely, so that that the loader is hooked to the tractor but that there is a clearance between these male and female members allowing adjustment of the position of the loader relative to the tractor, the spring tending permanently to maintain said latch in the locking or pre-locking position .

Grâce à ces caractéristiques de l'invention, il est possible de rendre le chargeur solidaire du tracteur, même s'il n'est pas parfaitement positionné et centré par rapport à celui-ci. L'opérateur peut - à l'aide des vérins hydrauliques - soulever légèrement le chargeur C pour le positionner au mieux et ajuster sa mise en place définitive avant de verrouiller les moyens d'accouplement.Thanks to these features of the invention, it is possible to make the loader integral with the tractor, even if it is not perfectly positioned and centered relative thereto. The operator can - using the hydraulic cylinders - slightly lift the loader C to position it better and adjust its final placement before locking the coupling means.

Selon d'autres caractéristiques avantageuses et non limitatives de l'invention, prises seules ou en combinaison :

  • les organes d'accouplement mâles sont constitués par un barreau et les organes d'accouplement femelles par une main en U, le barreau étant disposé à l'embouchure de la main en U lorsque le loquet est en position de préverrouillage et étant complètement engagé dans le fond de la main en U lorsque le loquet est en position de verrouillage ;
  • les organes d'accouplement mâles sont solidaires du cadre d'attelage et les organes d'accouplement femelles sont solidaires de la tête d'attelage ;
  • le loquet est monté pivotant autour d'un axe porté par le cadre d'attelage ;
  • l'axe de pivotement du loquet est le barreau de la paire arrière d'organes d'accouplement ;
  • ladite tête d'attelage comprend une rampe de roulement située devant la main en U de la paire arrière d'organes d'accouplement, une encoche de préverrouillage et une butée de verrouillage aptes à coopérer avec ledit loquet étant prévues de chaque côté de ladite rampe de roulement et le loquet comprend deux demi-loquets susceptibles de s'engager de chaque côté de cette rampe;
  • le barreau de la paire arrière d'organes d'accouplement présente dans sa partie médiane, un rouleau monté fou, susceptible de rouler sur la rampe de roulement de la tête d'attelage;
  • ledit loquet peut être déplacé de la position de verrouillage ou de la position de préverrouillage dans une position dite "de déverrouillage" dans laquelle il ne coopère pas avec lesdits moyens de verrouillage ou de préverrouillage de sorte que le chargeur peut être décroché du tracteur, son déplacement dans cette position de déverrouillage s'effectuant à l'aide d'un levier de commande agissant à l'encontre de la force de rappel du ressort dudit loquet;
  • ledit cadre d'attelage comprend une cavité de blocage qui permet de bloquer ledit levier de commande dans la position dans laquelle ledit loquet est dans la position de déverrouillage ;
  • l'extrémité arrière de la tête d'attelage comprend un évidement de déblocage qui permet lors du désaccouplement du chargeur et du tracteur, de faire sortir le levier de commande de ladite cavité de blocage pour libérer ledit loquet ;
  • ladite tête d'attelage comprend un rouleau latéral de guidage du bord inférieur de l'un des flasques du cadre d'attelage du chargeur, lors des opérations d'accouplement et de désaccouplement du chargeur et du tracteur.
According to other advantageous and nonlimiting features of the invention, taken alone or in combination:
  • the male coupling members are constituted by a bar and the female coupling members by a U-shaped hand, the bar being disposed at the mouth of the U-shaped hand when the latch is in the pre-locking position and being fully engaged in the bottom of the U-shaped hand when the latch is in the locked position;
  • the male coupling members are integral with the coupling frame and the female coupling members are integral with the coupling head;
  • the latch is pivotally mounted about an axis carried by the hitch frame;
  • the pivot axis of the latch is the bar of the rear pair of coupling members;
  • said coupling head comprises a rolling ramp located in front of the U-shaped hand of the rear pair of coupling members, a pre-locking notch and a locking stop adapted to cooperate with said latch being provided on each side of said ramp; rolling and the latch comprises two half latches engageable on each side of this ramp;
  • the bar of the rear pair of coupling members has in its middle part, a mounted idler roller, capable of rolling on the running ramp of the coupling head;
  • said latch can be moved from the locking position or the pre-lock position to a so-called "unlocking" position in which it does not cooperate with said locking or pre-locking means so that the loader can be unhooked from the tractor, its moving in this unlocking position effected by means of a control lever acting against the return force of the spring of said latch;
  • said hitch frame includes a locking cavity for locking said control lever in the position in which said latch is in the unlocking position;
  • the rear end of the coupling head comprises an unlocking recess which allows when uncoupling the loader and the tractor, to release the control lever from said locking cavity to release said latch;
  • said coupling head comprises a lateral roller guiding the lower edge of one of the flanges of the hitch frame of the loader, during the coupling and uncoupling operations of the loader and the tractor.

D'autres caractéristiques et avantages de l'invention apparaîtront de la description qui va maintenant en être faite, en référence aux dessins annexés, qui en représentent, à titre indicatif mais non limitatif, des modes de réalisation possibles.Other features and advantages of the invention will appear from the description which will now be made, with reference to the accompanying drawings, which represent, by way of indication but not limitation, possible embodiments.

Sur ces dessins :

  • la figure 1 est un schéma général représentant un chargeur prêt à être monté sur un tracteur agricole, à l'aide du dispositif d'accrochage conforme à l'invention,
  • la figure 2 est une vue en perspective, du dispositif conforme à l'invention, sur laquelle l'un des flasques du cadre d'attelage a été retiré,
  • la figure 3 est une vue en perspective similaire à celle de la figure 2 mais selon un autre angle, le cadre et la tête d'attelage étant par ailleurs écartés l'un de l'autre,
  • la figure 4 est une vue du côté avant du dispositif d'accouplement, le cadre et la tête d'attelage étant accouplés,
  • la figure 5 est une vue du côté arrière du cadre d'attelage uniquement,
  • la figure 6 est une vue en perspective du loquet,
  • les figures 7A à 7F sont des schémas représentant les étapes successives d'engagement, de préverrouillage et de verrouillage du cadre d'attelage sur la tête d'attelage, l'un des flasques du cadre d'attelage ayant été retiré à des fins de simplification, et
  • les figures 8A à 8F sont des schémas représentant les étapes successives de déverrouillage et de désengagement du cadre et de la tête d'attelage, l'un des flasques du cadre ayant été partiellement tronqué selon un arc de cercle pour faciliter la visibilité des pièces.
On these drawings:
  • the figure 1 is a general diagram showing a loader ready to be mounted on an agricultural tractor, with the aid of the hooking device according to the invention,
  • the figure 2 is a perspective view of the device according to the invention, on which one of the flanges of the coupling frame has been removed,
  • the figure 3 is a perspective view similar to that of the figure 2 but from another angle, the frame and the coupling head being further apart from each other,
  • the figure 4 is a view of the front side of the coupling device, the frame and the coupling head being coupled,
  • the figure 5 is a view of the rear side of the coupling frame only,
  • the figure 6 is a perspective view of the latch,
  • the Figures 7A to 7F are diagrams illustrating the successive stages of engagement, pre-locking and locking of the coupling frame on the coupling head, one of the flanges of the coupling frame having been removed for simplification purposes, and
  • the Figures 8A to 8F are diagrams representing the successive steps of unlocking and disengaging the frame and the coupling head, one of the flanges of the frame having been partially truncated along an arc to facilitate the visibility of the parts.

Le cadre d'attelage 1 représenté sur les figures 2 à 5 est celui qui est destiné à être fixé du côté droit du tracteur. Il comprend deux flasques parallèles, espacés l'un de l'autre, le flasque situé vers l'intérieur, c'est à dire en regard du tracteur portant la référence numérique 10 et l'autre la référence 10'.The hitch frame 1 shown on the Figures 2 to 5 is the one that is intended to be attached to the right side of the tractor. It comprises two parallel flanges, spaced from each other, the flange located inward, that is to say facing the tractor bearing the reference numeral 10 and the other the reference 10 '.

En se reportant aux figures 2 et 4, on peut voir que lors de l'accouplement, la tête d'attelage 2 est insérée entre ces deux flasques 10 et 10'.Referring to figures 2 and 4 it can be seen that during coupling, the coupling head 2 is inserted between these two flanges 10 and 10 '.

Cette tête d'attelage 2 va maintenant être décrite plus en détails.This coupling head 2 will now be described in more detail.

Elle est constituée d'une pièce de forme allongée dont l'épaisseur lui permet de pénétrer entre les deux flasques 10 et 10'. Elle est presque symétrique par rapport à un plan vertical médian référencé P. It consists of an elongated piece whose thickness allows it to penetrate between the two flanges 10 and 10 '. It is almost symmetrical with respect to a median vertical plane referenced P.

La tête d'attelage 2 présente deux extrémités, dites "avant" et "arrière" par référence au sens de déplacement du tracteur, référencées respectivement 28 et 26.The coupling head 2 has two ends, called "front" and "rear" with reference to the direction of travel of the tractor, referenced respectively 28 and 26.

Elle comprend à chacune de ses deux extrémités 28 et 26, deux mains d'accrochage en U référencées respectivement 21 et 22, dénommées "main avant" et "main arrière".It comprises at each of its two ends 28 and 26, two U-shaped gripping hands respectively referenced 21 and 22, referred to as "front hand" and "rear hand".

Chacune de ces mains en U constitue l'organe femelle d'une paire d'organes d'accouplement. Leur concavité est orientée en direction de l'avant du tracteur. L'axe central de leur portion concave est perpendiculaire au plan P. Each of these U-shaped hands constitutes the female member of a pair of coupling members. Their concavity is oriented toward the front of the tractor. The central axis of their concave portion is perpendicular to the plane P.

Comme cela apparaît mieux sur la figure 3, le rebord supérieur 23 de la tête d'attelage 2 s'étend depuis une zone située au-dessus de la main avant 21 jusqu'à l'entrée de la main arrière 22. Ce rebord 23 constitue une rampe de roulement légèrement inclinée vers le haut depuis l'avant vers l'arrière de la tête 2.As it appears better on the figure 3 , the upper flange 23 of the coupling head 2 extends from an area above the hand before 21 to the entrance of the rear hand 22. This flange 23 is a slightly inclined running ramp to the top from the front to the back of the head 2.

Deux encoches 24, 24', dites "encoches de préverrouillage", sont ménagées de part et d'autre de la rampe de roulement 23, sensiblement à la moitié de la longueur de cette rampe.Two notches 24, 24 ', called "pre-locking notches", are provided on either side of the running ramp 23, substantially at half the length of this ramp.

Ces encoches sont symétriques par rapport au plan médian vertical P. Elles présentent en vue de côté la forme d'un V ouvert vers le haut.These notches are symmetrical with respect to the vertical median plane P. They have a side view in the form of an open V upwards.

Deux butées 25, 25' dites "butées de verrouillage" sont également ménagées de part et d'autre de la rampe de roulement 23. Elles sont symétriques par rapport au plan P. Two stops 25, 25 'called "locking stops" are also provided on either side of the rolling ramp 23. They are symmetrical with respect to the plane P.

Ces butées 25, respectivement 25' sont disposées à proximité immédiate des encoches 24, respectivement 24', et entre ces encoches et la main arrière 22.These stops 25 and 25 'respectively are arranged in the immediate vicinity of the notches 24, respectively 24', and between these notches and the rear hand 22.

Au niveau des encoches 24, 24' et des butées 25, 25', la rampe de roulement 23 présente une épaisseur inférieure à celle de sa partie avant. La portion de la rampe de roulement 23 plus étroite, située entre ces encoches et butées porte la référence 230.At the notches 24, 24 'and stops 25, 25', the running ramp 23 has a thickness less than that of its front portion. The portion of the ramp 23 narrower, located between these notches and stops is reference 230.

Un évidement 260 est ménagé sur la face orientée vers l'extérieur de l'extrémité arrière 26 arrondie de la tête d'attelage 2. Sa concavité est orientée vers l'arrière du tracteur. Cet évidement est visible sur les figures 7 et 8.A recess 260 is formed on the outward facing face of the rounded rear end 26 of the coupling head 2. Its concavity is oriented towards the rear of the tractor. This recess is visible on the figures 7 and 8 .

Enfin, la tête 2 comprend sous la main avant 21, un rouleau latéral de guidage 27 monté fou autour d'un axe 270 perpendiculaire au plan P. Finally, the head 2 comprises under the hand before 21, a lateral guide roller 27 mounted idler about an axis 270 perpendicular to the plane P.

Ce rouleau de guidage 27 est légèrement décalé en direction de l'intérieur du tracteur par rapport au plan médian P. This guide roller 27 is slightly offset towards the inside of the tractor relative to the median plane P.

Le cadre d'attelage 1 va maintenant être décrit plus en détails.The hitch frame 1 will now be described in more detail.

Il comprend deux barreaux parallèles, fixés entre les deux flasques 10 et 10'. En position d'accouplement du cadre 1 et de la tête 2 d'attelage, les flasques 10 et 10' s'étendent dans des plans parallèles au plan médian P. It comprises two parallel bars fixed between the two flanges 10 and 10 '. In the coupling position of the frame 1 and the coupling head 2, the flanges 10 and 10 'extend in planes parallel to the median plane P.

Le barreau destiné à s'accoupler avec la main avant 21 est dénommé barreau "avant" et porte la référence numérique 11, le barreau destiné à s'accoupler avec la main arrière 22 est dénommé barreau "arrière" et porte la référence numérique 12.The bar intended to mate with the front hand 21 is called the "front" bar and has the reference numeral 11, the bar intended to mate with the rear hand 22 is referred to as the "rear" bar and has the reference numeral 12.

Ces barreaux 11 et 12 s'étendent selon des axes respectifs X1-X'1 et X2-X'2 perpendiculaires au plan des flasques 10 et 10'. Chaque barreau constitue l'organe mâle d'une paire d'organe d'accouplement.These bars 11 and 12 extend along respective axes X1-X'1 and X2-X'2 perpendicular to the plane of the flanges 10 and 10 '. Each bar constitutes the male member of a pair of coupling members.

Une entretoise 13 s'étend entre les deux flasques 10 et 10', elle est disposée sensiblement au-dessus du barreau 12.A spacer 13 extends between the two flanges 10 and 10 ', it is disposed substantially above the bar 12.

Le cadre d'attelage 2 comprend en outre un loquet 14 monté pivotant à l'une de ses extrémités autour d'un axe perpendiculaire au plan des deux flasques 10 et 10'.The hitch frame 2 further comprises a latch 14 pivotally mounted at one of its ends about an axis perpendicular to the plane of the two flanges 10 and 10 '.

De façon avantageuse, l'axe autour duquel pivote ce loquet 14 est le barreau arrière 12.Advantageously, the axis about which pivots this latch 14 is the rear bar 12.

Comme cela apparaît mieux sur la figure 6, ce loquet 14 est constitué de deux demi-loquets 140, 140', parallèles, de forme générale triangulaire dont la pointe est orientée vers le bas.As it appears better on the figure 6 , this latch 14 consists of two half latches 140, 140 ', parallel, generally triangular in shape, the tip is oriented downwards.

Chaque demi-loquet 140 présente une extrémité avant 142, une face avant 144 et une extrémité arrière 143 percée d'un orifice 141 autorisant le passage de l'axe X2-X'2 du barreau 12. Le demi-loquet 140' présente une structure identique et les mêmes éléments portent les mêmes références numériques majorées du signe prime.Each half-latch 140 has a front end 142, a front face 144 and a rear end 143 pierced with an orifice 141 allowing the passage of the axis X2-X'2 of the bar 12. The half-latch 140 'has a same structure and the same elements bear the same numerical references plus the prime sign.

Les deux demi-loquets 140 et 140' sont en outre réunis à leurs extrémités avant 142, 142' par des moyens de fixation, tel qu'un boulon 163 et un écrou 164.The two half latches 140 and 140 'are further joined at their front ends 142, 142' by fastening means, such as a bolt 163 and a nut 164.

La structure du barreau 12 va maintenant être détaillée en faisant référence à la figure 3. Il présente la forme générale d'une bobine.The structure of the bar 12 will now be detailed with reference to the figure 3 . It has the general shape of a coil.

Il se compose d'un axe central non visible sur les figures et représenté uniquement par le trait d'axe X2-X'2, de deux parties latérales coniques 121 et 121' dont les pointes sont orientées l'une vers l'autre et d'un rouleau central 122 monté fou autour dudit axe X2-X'2. It consists of a central axis not visible in the figures and represented solely by the line X2-X'2 axis , two conical side portions 121 and 121 'whose points are oriented towards each other and a central roll 122 idly mounted about said axis X2-X'2.

Chaque partie conique 121, 121' est percée d'un orifice central autorisant le passage de l'axe X2-X'2 et est soudée à un flasque 10, respectivement 10'.Each conical portion 121, 121 'is pierced with a central orifice allowing passage of the axis X2-X'2 and is welded to a flange 10, respectively 10'.

L'axe cylindrique X2-X'2 est épaulé sur l'un des flasques et fixé sur l'autre, par exemple par une vis 123, de façon à être démontable.The cylindrical axis X2-X'2 is supported on one of the flanges and fixed on the other, for example by a screw 123, so as to be removable.

Enfin, les extrémités arrières 143 et 143' des deux demi-loquets 140 et 140' sont montées pivotantes autour dudit axe et insérées entre le rouleau 122 et les deux parties coniques 121 et 121'.Finally, the rear ends 143 and 143 'of the two half latches 140 and 140' are pivotally mounted about said axis and inserted between the roller 122 and the two conical portions 121 and 121 '.

Par ailleurs, le loquet 14 est sollicité en permanence par un ressort hélicoïdal 15.Moreover, the latch 14 is permanently biased by a helical spring 15.

A cet effet, une biellette 16 est intercalée entre les extrémités avant 142, 142' des deux demi-loquets 140 et 140'. Elle s'étend dans le plan médian vertical P. For this purpose, a rod 16 is interposed between the front ends 142, 142 'of the two half latches 140 and 140'. It extends in the vertical median plane P.

Son extrémité inférieure est percée d'un orifice autorisant le passage du boulon 163.Its lower end is pierced with a hole allowing the passage of the bolt 163.

Son extrémité supérieure est percée d'un orifice oblong 162.Its upper end is pierced with an oblong hole 162.

Enfin, le ressort 15 est fixé à son extrémité inférieure à une broche de fixation 150 qui s'étend entre les deux flasques 10 et 10', perpendiculairement à ceux-ci et à son extrémité supérieure 152 à un orifice 61 ménagé dans la biellette 16.Finally, the spring 15 is fixed at its lower end to a fixing pin 150 which extends between the two flanges 10 and 10 ', perpendicular to them and at its upper end 152 to an orifice 61 formed in the rod 16 .

Le ressort 15 exerce une traction sur l'extrémité supérieure de la biellette 16, ce qui tend à déplacer en permanence le loquet 14 vers le bas.The spring 15 pulls on the upper end of the rod 16, which tends to permanently move the latch 14 downwards.

Un levier 17 s'étend entre les deux flasques 10 et 10' parallèlement au plan P. Il comprend deux bras parallèles, à savoir un bras extérieur 174' plus long et un bras intérieur 174 plus court.A lever 17 extends between the two flanges 10 and 10 'parallel to the plane P. It comprises two parallel arms, namely an outer arm 174' longer and a shorter inner arm 174.

Ce levier 17 est articulé autour d'un axe de rotation 171 perpendiculaire au plan P et monté à ses deux extrémités entre les deux flasques 10 et 10'.This lever 17 is articulated about an axis of rotation 171 perpendicular to the plane P and mounted at its two ends between the two flanges 10 and 10 '.

Plus précisément, un orifice de réception de l'une des extrémités dudit axe de rotation 171 est ménagé dans chacun des flasques 10, 10'. Cet orifice est de forme sensiblement triangulaire à angles arrondis et ses dimensions sont légèrement supérieures à celle des extrémités de l'axe 171.More specifically, an orifice for receiving one end of said axis of rotation 171 is formed in each of the flanges 10, 10 '. This orifice is of substantially triangular shape with rounded angles and its dimensions are slightly greater than that of the ends of the axis 171.

Seul l'orifice de réception 102' ménagé dans le flasque 10' est visible sur les figures 3, 7 et 8.Only the receiving orifice 102 'formed in the flange 10' is visible on the figures 3 , 7 and 8 .

L'axe de rotation 171 est monté entre les deux flasques 10 et 10' de façon que ses extrémités reposent sur les chants desdits orifices de réception et qu'elles puissent se déplacer avec un léger jeu à l'intérieur de ces orifices, comme on peut le voir sur les figures 8C et 8D par exemple.The axis of rotation 171 is mounted between the two flanges 10 and 10 'so that its ends rest on the edges of said receiving holes and they can move with a slight clearance inside these orifices, as one can see it on the Figures 8C and 8D for example.

Une tige 172 est fixée entre les extrémités avant des deux bras 174 et 174', perpendiculairement au plan P. Elle traverse l'orifice oblong 162 de la biellette 16 à l'intérieur duquel elle peut se déplacer. Cet orifice oblong 162 autorise un léger jeu entre le levier 17 et la biellette 16.A rod 172 is fixed between the front ends of the two arms 174 and 174 ', perpendicular to the plane P. It passes through the oblong hole 162 of the rod 16 within which it can move. This oblong hole 162 allows a slight clearance between the lever 17 and the rod 16.

Un second ressort hélicoïdal 18 est disposé parallèlement au premier ressort 15. Son extrémité inférieure est fixée à la broche 150 et son extrémité supérieure à la tige 172. Ce ressort 18 tend à ramener l'extrémité avant du levier 17 en permanence vers le bas, dans la position illustrée sur la figure 2.A second coil spring 18 is disposed parallel to the first spring 15. Its lower end is fixed to the pin 150 and its upper end to the rod 172. This spring 18 tends to bring the front end of the lever 17 permanently down, in the position illustrated on the figure 2 .

Par ailleurs, une tige 175 formant butée pour le levier 17 est fixée entre les deux flasques 10 et 10', perpendiculairement à ceux-ci, sous la partie du levier 17 qui s'étend entre son extrémité avant et l'axe 171.Furthermore, a rod 175 forming a stop for the lever 17 is fixed between the two flanges 10 and 10 ', perpendicular to them, under the part of the lever 17 which extends between its front end and the axis 171.

De plus, le bras extérieur 174' du levier 17 est muni à son extrémité arrière d'une poignée 170 qui fait saillie vers l'extérieur du tracteur, perpendiculairement au plan P, hors du flasque extérieur 10'.In addition, the outer arm 174 'of the lever 17 is provided at its rear end with a handle 170 which protrudes outwardly of the tractor, perpendicular to the plane P, out of the outer flange 10'.

Lorsqu'un opérateur abaisse la poignée 170, le levier 17 pivote autour de son axe 171 et son extrémité avant portant la broche 172 soulève la biellette 16 à l'encontre de la force de rappel des ressorts 15 et 18, ce qui a pour effet de soulever le loquet 14.When an operator lowers the handle 170, the lever 17 pivots about its axis 171 and its front end carrying the pin 172 raises the rod 16 against the restoring force of the springs 15 and 18, which has the effect lift the latch 14.

En outre, le bras extérieur 174' du levier 17 comporte à son extrémité arrière, sur sa face opposée à celle où est fixée la poignée 170, un ergot 173. Cet ergot est susceptible de coopérer avec l'évidement 260 de la tête d'attelage 2 comme cela sera décrit ultérieurement.In addition, the outer arm 174 'of the lever 17 has at its rear end, on its opposite side to that where is fixed the handle 170, a lug 173. This lug is capable of cooperating with the recess 260 of the head of coupling 2 as will be described later.

Enfin, le flasque extérieur 10' présente le long de son bord arrière, dans sa partie supérieure, un décrochement 101' qui constitue une butée au déplacement vers le haut du levier 17 et dans sa partie médiane, une cavité 100'.Finally, the outer flange 10 'has along its rear edge, in its upper part, a recess 101' which constitutes an abutment to the upward movement of the lever 17 and in its middle part, a cavity 100 '.

Un mode de réalisation possible du dispositif vient d'être décrit.A possible embodiment of the device has just been described.

Selon une autre variante de réalisation non représentée, il est possible d'inverser les organes mâles et femelles de sorte qu'au moins l'un des axes mâles 11, 12 soit solidaire de la tête 2 et qu'au moins l'une des mains en U 21, 22 soit solidaire du cadre 1, sans sortir du cadre de l'invention.According to another variant embodiment not shown, it is possible to reverse the male and female members so that at least one of the male pins 11, 12 is integral with the head 2 and at least one of U-shaped hands 21, 22 is integral with the frame 1, without departing from the scope of the invention.

De même, le loquet 14 pourrait être coulissant au lieu de pivotant.Similarly, the latch 14 could be slidable instead of pivoting.

Le fonctionnement du dispositif va maintenant être expliqué de façon plus détaillée.The operation of the device will now be explained in more detail.

La phase d'accouplement du cadre d'attelage 1 sur la tête d'attelage 2 est décrite en faisant référence aux figures 7A à 7F.The coupling phase of the coupling frame 1 on the coupling head 2 is described with reference to the Figures 7A to 7F .

Sur la figure 7A, le chargeur et le tracteur sont écartés l'un de l'autre. Le loquet 14 est en position de repos, c'est-à-dire maintenu vers le bas sous l'action du ressort de rappel 15. La poignée 170 vient en butée contre le haut du décrochement 101' et la partie avant du levier 17 contre la tige 175.On the Figure 7A , the loader and the tractor are separated from each other. The latch 14 is in the rest position, that is to say, held down by the action of the return spring 15. The handle 170 abuts against the top of the recess 101 'and the front portion of the lever 17 against the rod 175.

L'opérateur déplace ensuite le tracteur dans le sens de la flèche F. Lorsque l'extrémité avant de la main en U 21 arrive au contact du loquet 14, elle tend à soulever celui-ci légèrement vers le haut à l'encontre de la force du ressort 15.The operator then moves the tractor in the direction of the arrow F. When the front end of the U-shaped hand 21 comes into contact with the latch 14, it tends to lift it slightly upwards against the spring force 15.

Le rouleau fou 122 du barreau 12 commence à rouler le long de la rampe de roulement 23, les parties coniques 121 et 21' du barreau en forme de bobine facilitant l'alignement du cadre d'attelage 1 dans le plan médian P de la tête d'attelage 2.The idler roll 122 of the bar 12 begins to roll along the running ramp 23, the conical portions 121 and 21 'of the coil-shaped bar facilitating the alignment of the coupling frame 1 in the median plane P of the head coupling 2.

En se reportant à la figure 7C, on peut voir que lorsque le tracteur continue d'avancer vers la gauche, les extrémités des deux demi-loquets 140 et 140' se déplacent également le long de la rampe de roulement 23, (le demi-loquet 140' n'apparaît pas sur les vues de face de la figure 7).Referring to the Figure 7C it can be seen that as the tractor continues to move to the left, the ends of the two half latches 140 and 140 'also move along the running ramp 23, (the half-latch 140' does not appear on the front views of the figure 7 ).

Lorsque la tête d'attelage 2 arrive dans la position illustrée sur la figure 7D, les deux demi-loquets 140 et 140' arrivent en regard des encoches 24 et 24', ménagées de part et d'autre de la rampe de roulement 23. Sous l'action du ressort 15, le loquet 14 est plaqué vers le bas, chaque demi-loquet venant s'engager dans les encoches 24, 24'. Le loquet 14 est dans une position dite de "préverrouillage".When the coupling head 2 arrives in the position illustrated on the Figure 7D , the two half latches 140 and 140 'arrive next to the notches 24 and 24', formed on either side of the rolling ramp 23. Under the action of the spring 15, the latch 14 is pressed downwards each half-latch engaging in notches 24, 24 '. The latch 14 is in a position called "pre-lock".

Dans cette position, les barreaux 11 et 12 sont introduits à l'entrée des mains en U 21, respectivement 22. Le cadre d'attelage 1 du chargeur est donc solidaire de la tête d'attelage 2 du bâti d'adaptation du tracteur.In this position, the bars 11 and 12 are introduced at the entrance of the U-shaped hands 21, respectively 22. The hitch frame 1 of the loader is secured to the coupling head 2 of the tractor adaptation frame.

Dans cette position de préverouillage, l'opérateur peut descendre du tracteur, effectuer les branchements des systèmes hydrauliques et retirer les béquilles sans courir le risque de voir le chargeur se détacher du tracteur.In this pre-docking position, the operator can get off the tractor, connect the hydraulic systems and remove the crutches without the risk of the loader coming off the tractor.

Ensuite, en faisant fonctionner les moyens d'alimentation hydrauliques, il peut simultanément soulever légèrement le chargeur et continuer d'avancer le tracteur vers la gauche des figures. Ceci lui permet de centrer correctement les barreaux 11 et 12, de façon à ce que leurs axes respectifs X1-X'1 et X2-X'2 soient perpendiculaires au plan médian P de la tête d'attelage 2.Then, by operating the hydraulic supply means, it can simultaneously lift the loader slightly and continue to advance the tractor to the left of the figures. This allows it to correctly center the bars 11 and 12, so that their respective axes X1-X'1 and X2-X'2 are perpendicular to the median plane P of the coupling head 2.

Cette action amène la tête et le cadre d'attelage dans la position illustrée sur la figure 7E. Le loquet 14 est légèrement soulevé pour sortir des encoches 24 et 24' jusqu'à arriver dans la position de verrouillage finale illustrée sur la figure 7F.This action brings the head and hitch frame into the position shown on the figure 7E . The latch 14 is raised slightly to exit the notches 24 and 24 'until it reaches the final locking position shown in FIG. figure 7F .

Dans cette position, le loquet 14 est revenu à sa position d'origine orientée au maximum vers le bas. Les faces avant 144, 144' du loquet 14 viennent alors au contact des butées 25, respectivement 25'.In this position, the latch 14 has returned to its original position oriented at the maximum downward. The front faces 144, 144 'of the latch 14 then come into contact with the stops 25, respectively 25'.

Dans cette position, le levier 17 et sa poignée 170 sont relevés au maximum.In this position, the lever 17 and its handle 170 are raised to the maximum.

La phase de désaccouplement du chargeur va maintenant être expliquée en détail en faisant référence aux figures 8A à 8F.The uncoupling phase of the charger will now be explained in detail with reference to Figures 8A to 8F .

La figure 8A correspond à la figure 7F.The figure 8A corresponds to the figure 7F .

Comme représenté sur la figure 8B, l'opérateur abaisse le levier 17 grâce à la poignée 170 et amène celle-ci vers le bas jusqu'à ce que cette poignée 170 soit bloquée dans la cavité 100'.As shown on the Figure 8B , the operator lowers the lever 17 with the handle 170 and brings it down until the handle 170 is locked in the cavity 100 '.

Dans cette position dite "de déverrouillage", le loquet 14 est soulevé grâce au levier 17 à l'encontre de la force de rappel du ressort 15, les deux demi-loquets 140 et 140' n'étant alors plus au contact des butées 25 et 25'.In this so-called "unlocking" position, the latch 14 is lifted thanks to the lever 17 against the restoring force of the spring 15, the two half latches 140 and 140 'then no longer in contact with the stops 25 and 25 '.

Comme illustré sur la figure 8C, l'opérateur peut alors commencer à reculer le chargeur et la tête d'attelage 2 vers la droite (flèche G).As illustrated on the Figure 8C , the operator can then start to reverse the loader and the coupling head 2 to the right (arrow G).

Au cours de cette opération, l'ergot 173 vient au contact de l'évidement 260 de la tête d'attelage 2.During this operation, the lug 173 comes into contact with the recess 260 of the coupling head 2.

Lorsque le tracteur poursuit son recul, comme représenté sur la figure 8D, le rebord de l'évidement 260 agit sur l'ergot 173 et entraîne celui-ci légèrement vers l'arrière, ce qui est possible car l'axe de rotation 171 du levier 17 est monté avec un certain jeu dans les évidements 102'. Ceci a pour effet, de l'autre côté du levier, de libérer la poignée 170 hors de la cavité 100'.When the tractor continues to retreat, as shown on the figure 8D , the rim of the recess 260 acts on the pin 173 and drives it slightly backwards, which is possible because the axis of rotation 171 of the lever 17 is mounted with a certain clearance in the recesses 102 ' . This has the effect, on the other side of the lever, to release the handle 170 out of the cavity 100 '.

Le levier 17 étant libéré, les ressorts de rappel 15 et 18 tendent à le rappeler vers le bas ainsi que le loquet. 14. Toutefois, le loquet 14 se trouve alors en regard de la rampe de roulement 23 et ne peut pas descendre complètement jusqu'en bas. Le rouleau fou 122 continue de rouler le long de la rampe 23. Sous l'action du ressort 18, le levier tend à revenir vers sa position d'origine et la tige 172 se place dans le bas de l'orifice oblong 162.The lever 17 being released, the return springs 15 and 18 tend to recall it downwards as well as the latch. 14. However, the latch 14 is then facing the running ramp 23 and can not go down completely. The idler roll 122 continues to roll along the ramp 23. Under the action of the spring 18, the lever tends to return to its original position and the rod 172 is placed in the bottom of the oblong orifice 162.

Enfin, lorsque la tête d'attelage 2 est complètement reculée, le loquet 14 est libéré et le ressort de rappel 15 tend à le ramener dans sa position d'origine comme illustré sur la figure 8F de sorte que le cadre d'attelage 1 est prêt pour un nouvel accouplement.Finally, when the coupling head 2 is completely retracted, the latch 14 is released and the return spring 15 tends to bring it back to its original position as shown in FIG. figure 8F so that the hitch frame 1 is ready for a new coupling.

Claims (11)

  1. A coupling device for coupling a loader (C) to a tractor (T), the coupling frame (1) of the loader (C) being provided with one of two male or female coupling members (11, 12; 21, 22) of each of two pairs of so-called "front" and "rear" coupling members (11, 21; 12, 22), and with a catch (14) biased by a spring (15), the coupling head (2) of an adapter frame (BA) carried by said tractor (T) being provided with two coupling members (12, 11; 22, 21) complementary to those carried by said coupling frame (1) and with locking means (25, 25'), said catch (14) co-operating with said locking means (25, 25') to occupy a so-called "locking" position in which said male members (11, 12) are fully coupled with said female members (21, 22), the device being characterized in that said coupling head (2) includes prelocking means (24, 24') with which said catch (14) can co-operate to occupy a so-called "prelocking" position in which the male and female members (11, 12; 21, 22) of each pair are engaged in an incomplete manner, such that the loader (C) is secured to the tractor (T) while leaving clearance between the male and female members (11, 12; 21, 22) allowing the position of the loader (C) to be adjusted relative to the tractor (T), the spring (15) tending continuously to hold said catch (14) in the locking or prelocking position.
  2. A coupling device according to claim 1, characterized in that the male coupling members (11, 12) are constituted by respective bars and the female coupling members (21, 22) by respective U-shaped couplers, each bar (11, 12) being disposed in the opening of the U-shaped coupler (21, 22) when the catch (14) is in the prelocking position, and being fully engaged in the bottom of the U-shaped coupler when the catch (14) is in the locking position.
  3. A coupling device according to claim 1 or claim 2, characterized in that the male coupling members (11, 12) form part of the coupling frame (1) and the female coupling members (21, 22) form part of the coupling head (2).
  4. A coupling device according to any preceding claim, characterized in that the catch (14) is mounted to pivot about a pin carried by the coupling frame (1).
  5. A coupling device according to claims 3 and 4, characterized in that the pivot pin of the catch (14) is the bar (12) of the rear pair of coupling members (12, 22).
  6. A coupling device according to claim 3 or claim 5, characterized in that said coupling head (2) includes a rolling ramp (23) situated in front of the U-shaped coupler (22) of the rear pair of coupling members, a prelocking notch (24, 24') and a locking abutment (25, 25') suitable for co-operating with said catch (14) being provided on either side of said rolling ramp (23), and in that the catch (14) comprises two half-catches (140, 140') suitable for engaging on either side of said ramp (23).
  7. A coupling device according to claim 6, characterized in that the bar (12) of the rear pair of coupling members (12, 22) presents in its middle portion a roller (122) mounted to rotate freely and suitable for rolling on the rolling ramp (23) of the coupling head (2).
  8. A coupling device according to any preceding claim, characterized in that said catch (14) can be moved from the locking position or the prelocking position into a "unlocking" position in which it does not co-operate with said locking (25, 25') or prelocking means (24, 24'), such that the loader (C) can be separated from the tractor (T), the catch being moved into this unlocking position with the help of a control lever (17) acting against the return force of the spring (15) of said catch.
  9. A coupling device according to claim 8, characterized in that said coupling frame (1) includes a blocking cavity (100') which enables said control lever (17) to be blocked in the position in which said catch (14) is in the unlocking position.
  10. A coupling device according to claim 9, characterized in that the rear end (26) of the coupling head (2) includes an unblocking recess (260) which serves during decoupling of the loader (C) from the tractor (T) to cause the control lever (17) to leave said blocking cavity (100') in order to release said catch (14).
  11. A coupling device according to any preceding claim, characterized in that said coupling head (2) includes a lateral guide roller (27) for guiding the bottom edge of one of the side plates (10) of the coupling frame (1) of the loader during the operations of coupling and decoupling the loader (C) and the tractor (T).
EP05775245A 2004-06-10 2005-06-06 Device for coupling a loader to a tractor Active EP1774106B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0406285A FR2871485B1 (en) 2004-06-10 2004-06-10 DEVICE FOR COUPLING A LOADER ON A TRACTOR
PCT/FR2005/001374 WO2006003286A1 (en) 2004-06-10 2005-06-06 Device for coupling a loader to a tractor

Publications (2)

Publication Number Publication Date
EP1774106A1 EP1774106A1 (en) 2007-04-18
EP1774106B1 true EP1774106B1 (en) 2008-10-22

Family

ID=34946339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05775245A Active EP1774106B1 (en) 2004-06-10 2005-06-06 Device for coupling a loader to a tractor

Country Status (12)

Country Link
US (1) US7549832B2 (en)
EP (1) EP1774106B1 (en)
JP (1) JP2008501879A (en)
KR (1) KR20070035031A (en)
AT (1) ATE412089T1 (en)
AU (1) AU2005259074A1 (en)
CA (1) CA2569799C (en)
DE (1) DE602005010586D1 (en)
ES (1) ES2315900T3 (en)
FR (1) FR2871485B1 (en)
NZ (1) NZ552198A (en)
WO (1) WO2006003286A1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102013222165A1 (en) 2013-10-01 2015-04-02 Deere & Company Front loaders arrangement
EP2857594A1 (en) 2013-10-01 2015-04-08 Deere & Company Front loader assembly
EP2857593A1 (en) 2013-10-01 2015-04-08 Deere & Company Front loader assembly

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DE102007048334A1 (en) * 2007-10-09 2009-04-23 Agco Gmbh Coupling device with semi-automatic locking
US8287226B1 (en) 2009-09-10 2012-10-16 Westendorf Manufacturing Co., Inc. Front end loader attachment and locking mechanism
KR200458229Y1 (en) * 2009-12-29 2012-01-30 박종병 Connector for tractor operation machine
US8500386B2 (en) * 2010-04-26 2013-08-06 Deere & Company Latching system for automatically securing front-mounted loader mast to tractor mounting frame
KR101416514B1 (en) * 2013-07-05 2014-07-14 (주)태성공업 Attachment to structure work for tractors
US9903095B2 (en) * 2015-01-30 2018-02-27 Caterpillar Inc. Tool coupler
US10208451B2 (en) 2015-10-26 2019-02-19 Kubota Corporation Work vehicle and front loader
JP6552399B2 (en) * 2015-12-07 2019-07-31 株式会社クボタ Work vehicle and front loader
JP6807296B2 (en) * 2017-11-02 2021-01-06 株式会社クボタ Front loader attachment / detachment structure, front loader and work vehicle
EP3409842B1 (en) * 2017-05-11 2019-07-10 Kubota Corporation A front loader and work vehicle
JP6818627B2 (en) * 2017-05-11 2021-01-20 株式会社クボタ Front loader attachment / detachment structure, front loader and work vehicle
US10119242B1 (en) * 2018-03-27 2018-11-06 Deere & Company Front loader mounting arrangement for a work vehicle
JP6942668B2 (en) * 2018-04-19 2021-09-29 株式会社クボタ Front loader attachment / detachment structure, front loader and work vehicle
US10570581B2 (en) * 2018-06-01 2020-02-25 Deere & Company Latching arrangement for coupling a front loader to a work vehicle
JP7185591B2 (en) * 2019-04-24 2022-12-07 株式会社クボタ Detachable structure of front loader, front loader and work vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222165A1 (en) 2013-10-01 2015-04-02 Deere & Company Front loaders arrangement
EP2857594A1 (en) 2013-10-01 2015-04-08 Deere & Company Front loader assembly
EP2857593A1 (en) 2013-10-01 2015-04-08 Deere & Company Front loader assembly
EP2857592A1 (en) 2013-10-01 2015-04-08 Deere & Company Front loader assembly

Also Published As

Publication number Publication date
US20070292254A1 (en) 2007-12-20
ES2315900T3 (en) 2009-04-01
CA2569799C (en) 2012-08-28
KR20070035031A (en) 2007-03-29
WO2006003286A1 (en) 2006-01-12
DE602005010586D1 (en) 2008-12-04
NZ552198A (en) 2009-11-27
JP2008501879A (en) 2008-01-24
FR2871485B1 (en) 2006-09-01
AU2005259074A1 (en) 2006-01-12
FR2871485A1 (en) 2005-12-16
EP1774106A1 (en) 2007-04-18
CA2569799A1 (en) 2006-01-12
US7549832B2 (en) 2009-06-23
ATE412089T1 (en) 2008-11-15

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