FR3063720A1 - LOADING MECHANISM - Google Patents

Abstract

The invention relates to a loading mechanism for loading and unloading a body. The loading mechanism comprises a frame (17, 18), an articulated loading arm (20) pivotally attached to the frame (17, 18) and having a main arm (30) and a pull arm (32), and a linkage (40) attached between the frame (17, 18) and the pull arm (32) and having a primary link (42), a lever link (44) pivotally attached to the main arm (30) and a secondary link (46), the link (40) being configured such that, in use, the pivoting of the loading arm (20) causes the pulling arm (32) to move relative to the main arm (30).

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,063,720 (to be used only for reproduction orders)

©) National registration number: 18 52088

COURBEVOIE © IntCI ⁸ : B 66 F 3/00 (2017.01), B 25 J 18/00

A1 PATENT APPLICATION

®) Date of filing: 09.03.18. © Applicant (s): HYVA HOLDING B.V. SN— NL. © Priority: 10.03.17 GB 17038969. @ Inventor (s): HARTL JOHANN, KAHRI MARKUS, PORTILLA PABLO, KOOL JARNO and BIEMOND (43) Date of public availability of the JACOB. request: 14.09.18 Bulletin 18/37. ©) List of documents cited in the report preliminary research: The latter was not established on the date of publication of the request. (© References to other national documents ® Holder (s): HYVA HOLDING B.V. SN. related: ©) Extension request (s): ® Agent (s): CABINET MADEUF.

LOADING MECHANISM.

FR 3 063 720 - A1 _ The invention relates to a loading mechanism for loading and unloading a body. The loading mechanism comprises a chassis (17, 18), an articulated loading arm (20) pivotally attached to the chassis (17, 18) and comprising a main arm (30) and a traction arm (32), and a link (40) attached between the frame (17, 18) and the traction arm (32) and comprising a primary link (42), a lever link (44) pivotally attached to the main arm (30) and a secondary link (46), the link (40) being configured so that, during use, the pivoting of the loading arm (20) causes the traction arm (32) to move relative to the main arm (30).

LOADING MECHANISM The invention relates to a loading mechanism for loading and unloading a body such as a container.

Hook loading vehicles capable of lifting and pulling a container on the rear of the vehicle are known. Such hook loading vehicles typically include a driver cabin, a main frame and a pivoting arm having a hook which cooperates with a bar on a container. One or more hydraulic cylinders are provided which can be actuated to pivot the arm relative to the main chassis in order to load / unload a container. During loading / unloading, the hook follows a general radial trajectory centered on the pivot axis of the arm. This results in the container being tilted when loaded / unloaded, which can lead to spillage of the contents of the container.

It may therefore be desirable to provide an improved charger for loading and unloading a body.

In one aspect, a loading mechanism is provided for loading and unloading a body, comprising a chassis, an articulated loading arm pivotally attached to the chassis and comprising a main arm and a traction arm, and a link attached between the chassis and the traction arm and comprising a primary link, a lever link pivotally attached to the main arm and a secondary link; wherein the link is configured so that, during use, the pivoting of the loading arm causes the traction arm to move relative to the main arm. The loading mechanism may be intended to load / unload a body on the chassis. The chassis may include one or more load carriers. The chassis can include multiple chassis parts. The body can be a container such as an open container at the top or any other suitable load. The link can be attached between the draw arm and the chassis on which the body is loaded or from which the body is unloaded. The loading arm can be pivotally attached to the chassis to a pivot axis which can be a fixed pivot axis.

The primary link can be pivotally attached to the frame and the lever link. The secondary link can be pivotally attached to the lever link and the draw arm. The primary link can be pivotally attached to the lever link on a first side of the lever joint and the secondary link can be pivotally attached to the lever link on a second, opposite side of the joint leverage. The primary link and / or the secondary link and / or the lever link can be rigid links having a fixed length. One or more of the links can be of variable length.

The first side can be on the side of the main arm which is opposite the chassis and the second side can be on the side of the main arm which, when in use, is opposite the body.

The lever connection can be a lever with two arms. The lever linkage can be a straight lever with two arms or an angular lever with two arms. The lever linkage may have an inlet joint and an outlet joint, with the lever linkage joint in between. The lever linkage may include an inlet joint to which the primary linkage is attached and an outlet joint to which the secondary linkage is attached, and the distance between the outlet joint and the lever joint may be greater than the distance between the input joint and the lever joint. The main arm includes an opening in which the lever link can pivot.

The connection can be configured so that, during use, during a movement of the loading arm from a rest configuration to a support configuration, the internal angle between the main arm and the arm traction decreases during at least one movement phase. The link can be configured so that, during use, during a movement of the loading arm from a resting configuration to a supported configuration, the internal angle between the main arm and the traction arm increases during at least one movement phase. The link can be configured so that the internal angle between the main arm and the traction arm decreases during a movement phase and increases during a subsequent movement phase. There can be more than two phases of movement. For example, the interior angle can increase during a first phase of movement, decrease during a second phase of movement and increase during a third phase of movement. The link and / or the articulation points of the link can be configured to give the desired movement and / or phases.

The connection can be configured so that, during use, the pivoting of the loading arm causes the end of the traction arm to move on a trajectory having a variable radius (that is to say a trajectory not circular). The trajectory can be elliptical or substantially elliptical. The link can be configured so that the internal angle between the draw arm and the main arm increases towards the end of the movement from the rest position to the loading position.

The connection may include a linear actuator adapted to move the traction arm relative to the main arm. The primary link and / or the secondary link can comprise the linear actuator. The linear actuator may include a hydraulic cylinder. In a resting configuration of the loading arm, at least part of the length of the linear actuator can be located in a cavity defined by the main arm. The linear actuator can be located close to and / or outside the main arm.

In the rest configuration, the primary link and the lever link are housed in a protected manner inside the main arm.

The main arm can be pivotally attached to the chassis. The main arm and the draw arm can be pivotally attached. The main arm and the draw arm can be pivotally attached to a fixed pivot. The traction arm may have a first and a second part which are substantially perpendicular to one another. The draw arm may be provided with a coupling, such as a hook, to be engaged with the body.

The secondary link is pivotally attached to the first part of the traction arm and the first part is pivotally attached to the main arm.

The loading mechanism may further include a linear actuator attached between the chassis and the main arm and adapted to rotate the loading arm. The linear actuator may include a hydraulic cylinder. There may be one or more linear actuators.

In another aspect, a vehicle is made available comprising a loading mechanism having at least one of the characteristics set out above. The vehicle can be a hook-loading vehicle or a hook-loading trailer. The hook-loading trailer can be adapted to be hooked to a tractor. The loading mechanism can be configured to load / unload a body on the vehicle. The loading mechanism can be configured to load / unload a body on the chassis of the vehicle. The loading mechanism can be configured to pull a body onto the vehicle so that the body is always in contact with either the ground or the vehicle. The chassis of the loading mechanism may be a part of or attached to the chassis of the vehicle.

The invention may include any combination of the characteristics and / or limitations to which reference is made in the present text, with the exception of combinations of characteristics which are mutually exclusive.

Embodiments of the invention will be described below, by way of examples, with reference to the drawings below in which:

- Figure 1 schematically shows a side view of a hook loading vehicle with a loading mechanism,

FIG. 2 schematically represents a side view of the loading mechanism with the loading arm articulated in a rest position,

FIG. 3 schematically represents a side view of the loading mechanism with the loading arm articulated in a supported position,

FIGS. 4 to 7 schematically represent a loading / unloading operation of a container using the loading mechanism, and

- Figure 8 schematically shows a side view of the loading mechanism performing a tilting operation.

Figure 1 shows a hook loading vehicle 10 which is used to lift and pull a body such as a container 12, on the vehicle 10. The vehicle comprises a driver's cabin 14, front and rear wheels 22 , 24, a chassis frame 16 and a loading mechanism 13. The chassis frame 16 has a substantially flat bed on which the container 12 can rest. As will be described in detail later, the loading mechanism 13 is adapted to pull (i.e. to load) a container 12 on the chassis frame 16 and to unload the container 12 from the chassis frame 16 while by constantly keeping the container 12 in contact with either the ground or the vehicle.

Referring to Figures 2 and 3, it can be seen that the loading mechanism 13 includes a frame with a sub-frame 17 and a tilting frame 18. The sub-frame

1Ί is fixed, for example by bolts, to the chassis frame 16 and the tilting frame 18 is pivotally mounted to the sub-frame 17 to a pivot axis 26 which is parallel to the transverse axis of the vehicle 10 and is located near the rear end 29 of the sub-frame 17. The loading mechanism 13 also includes an articulated loading arm 20 which is pivotally attached to the tilting frame 18 to a pivot axis 28 which is parallel to the transverse axis. The pivot axis 28 of the articulated loading arm 20 is spaced, in the longitudinal direction, from the pivot axis 26 of the tilting frame 18 and is thus closer to the front end of the chassis frame 16. A mechanism Locking device comprising two locks (not shown) is also provided, which can selectively lock either the tilting frame 18 at the sub-frame 17 or the tilting frame 18 at the loading arm 20. In other arrangements, it can there is no sub-frame 17 and, instead, the tilting frame 18 can be pivotally attached to the chassis frame 16. Furthermore, according to still other arrangements, there can be no frame tilt 18 and there may be only a sub-frame 17 attached to the chassis frame 16, or, alternatively, there may be only a chassis frame 16 to which the loading arm 20 is pivotally attached directly.

The articulated arm 20 comprises an elongated main arm 30 and a traction arm 32. A first end of the main arm 30 is pivotally attached to the tilting frame 18 to the pivot axis 28. The traction arm 32 has an L shape and includes first and second parts 31, 33 which are substantially perpendicular to each other. A first end of the first part 31 of the traction arm 32 is pivotally attached to the second end of the main arm 30 to a pivot axis 56 and the free end of the second part 33 of the traction arm 32 is provided with a hook 34 intended to be engaged with a lifting bar 36 of the container 12. The traction arm 32 is pivotable relative to the main arm 30 about the fixed pivot axis 56 which is parallel to the transverse axis .

Two parallel main hydraulic cylinders 38 are also provided, acting between the sub-frame 17 and the main arm 30 (one on each side of the main arm 30). In other arrangements, there may be more than two hydraulic cylinders 38, or a single hydraulic cylinder 38 may be used. In addition, other types of linear actuators can be used instead or in combination. One end of each cylinder 38 is pivotally attached to a front end 27 of the subframe 17 and the other end of each cylinder is pivotally attached to the main arm 30. When the locking mechanism locks the tilting frame 18 in the sub-frame 17, the main hydraulic cylinders 38 can be actuated to pivot the loading arm 20 around the pivot axis 28 between a rest configuration (Figure 2) and a lifting configuration (Figure 3). In the rest configuration of FIG. 2, the main arm 30 is substantially parallel to the sub-frame 17 and the second part 33 of the traction arm 32 is substantially perpendicular to the sub-frame 17. In the rest configuration, the mechanism loading can hold a container 12 on loading supports of the chassis frame 16. In the lifting configuration, the loading arm 20 is pivoted clockwise (in the view shown) and the angle θ between the upper face of the sub-frame 17 and the first side of the main arm 30 is of the order of 135 ° in this arrangement. Note that other suitable angles can be chosen. In this position, the hook 34 is located behind the rear of the chassis frame 16 of the vehicle 10 and is at a height H which corresponds to a location below the lifting height of a lifting bar 36 of a container 12, so that the hook 34 can be coupled to or uncoupled from the lifting bar 36. As will be described later in detail, the loading arm 20 can be rotated between a lifting or supported configuration and a rest configuration for pulling a container 12 over the bed of the chassis frame 16 and it can be rotated between a rest configuration and a lifting configuration for unloading a container 12 on the ground. A container 12 can, of course, be loaded onto or unloaded from any suitable surface.

The loading mechanism 13 also includes a connection 40 which is established between the tilting frame 18 and the traction arm 32. In other arrangements, the connection 40 could be established between the vehicle chassis frame 16 and the traction arm 32 or between the sub-frame 17 and the traction arm 32. Furthermore, the connection 40 could be established between the traction arm 32 and any support or fixed frame with respect to which the articulated arm 20 moves. The link 40 is configured so that, when the articulated arm 20 is pivoted about Tax 28, the traction arm 32 automatically rotates relative to the main arm 30. This ensures a relatively low trajectory of the hook 34, which can reduce the spillage of the contents of a container 12, reduce the need for space to store the container 12 and / or allow the use of containers 12 of a lower height.

The link 40 comprises a primary link 42, a lever link 44 and a secondary link 46. The lever link 44 is pivotally attached to the main arm 30 to a lever pivot axis 48 which is located towards the second end of the main arm 30. The main arm 30 is provided with an opening (not shown) which allows the lever linkage 44 to pivot relative to the main arm 30 about an axis parallel to the transverse axis. The lever link 44 extends from a first side 50 of the main arm 30 (which is opposite the sub-frame 17) to a second side 52, opposite the first, of the main arm 30.

The primary link 42 is in the form of an elongated element and is attached at a first end to the tilting frame 18 to a pivot axis 54, and at a second end to an input pivot axis 60 the lever link 44 which is located on the first side 50 of the main arm 30. The pivot axis 54 is located at a higher level than that of the pivot axis 28 and is offset from the pivot axis 28.

In the present arrangement, the secondary link 46 is an auxiliary hydraulic cylinder 46 and is pivotally attached, at a first end, to the first part 31 of the traction arm 32 to a pivot axis 62 and, to a second end, to an outlet pivot axis 58 of the lever link 44, which is located on the second side 52 of the main arm 30. The auxiliary hydraulic cylinder 46 can be actuated to pivot the traction arm 32 relative to the main arm 30. In the rest configuration (Figure 2), the auxiliary hydraulic cylinder 46 is fully deployed so that the first part 31 of the traction arm 32 is substantially parallel to the main arm 30 and so that the second part 33 of the traction arm 32 is substantially vertical and perpendicular to the main arm 30. It should be noted that the secondary link 46 could be of any type of linear actuator or it could be a e fixed length link. In addition, in other arrangements, the primary link 42 could include, instead or additionally, a linear actuator such as a hydraulic cylinder.

In the rest configuration, the auxiliary cylinder 46 is approximately parallel (+/- 5 degrees) to the sub-frame 17 and most of the length of the auxiliary cylinder 46 is housed protected inside d 'a cavity defined by the main arm 30. In addition, the primary link 42 and the lever link 44 are both also housed in a protected manner inside the main arm 30. In other arrangements, the hydraulic cylinder (or the secondary link) 46 and / or the primary link 42 could be housed outside the main arm 30 (for example adjacent to the latter). In the rest configuration, the link is "folded" and thus the interior angles between adjacent links are relatively small. The link 40 is thus relatively compact in the rest configuration.

Now, an unloading operation, during which a container 12 is unloaded from the vehicle chassis frame 16, is described with reference to FIGS. 4 to 7.

As shown in Figure 4, when a container 12 is fully loaded on the flat bed of the chassis frame 16, the hook 34 of the traction arm 32 is engaged with the lifting bar 36 of the container 12. The main arm 30, the main hydraulic cylinder 38, the auxiliary hydraulic cylinder 46, the connection 40 and the first part 31 of the traction arm 32 are located below the container 12 in a recess defined by laterally spaced spars (not shown ) of the container 12 which rest on the chassis frame 16.

Referring to Figure 5, in order to unload the container 12, the auxiliary hydraulic cylinder 46 of the connection 40 is first retracted, which rotates the traction arm 32 relative to the main arm 30 around l pivot axis 56. This reduces the internal angle a between the first part 31 of the traction arm 32 and the main arm 30 and the container 12 is pushed backwards so that it protrudes from the rear end 29 of the chassis frame 16.

Referring to Figure 6, the main hydraulic cylinders 38 are then deployed which rotates the articulated loading arm 20 relative to the tilting frame 18 (and the chassis frame 16 and the sub-frame 17) around of the pivot axis 28. The connection 40 provided between the tilting frame 18 and the traction arm 32 means that, when the articulated loading arm 20 is pivoted, the traction arm 32 automatically pivots around the axis of pivot 56 relative to the main arm 30. More particularly, during a first phase of movement of the articulated loading arm 20, the internal angle a between the main arm 30 and the traction arm 32 decreases actively to obtain a lower trajectory of the hook 34. The pivot axis 54 of the primary link 42 is positioned so that, during a first phase of a pivoting movement of the articulated loading arm 20, the primary link 42 causes the rotatio n clockwise, the lever link 44 around the pivot axis 54. The rotation of the lever link 44 acts, for its part, on the secondary link 46 so that it puts in rotation the traction arm 32 relative to the main arm 30, clockwise around the pivot axis 56, thereby decreasing the internal angle a between the traction arm 32 and the main arm 30 The distance between the output pivot axis 58 and the lever pivot axis 48 is greater than the distance between the input pivot axis 60 and the lever pivot axis 48, and thus, the lever acts to amplify the movement. Alternatively, the distance between the output pivot axis 58 and the lever pivot axis 48 could be less than the distance between the input pivot axis 60 and the lever pivot axis 48 , so that the lever acts to reduce the displacement After a certain part of the pivoting movement of the articulated loading arm 20, the direction of rotation of the lever link 44 is reversed. Thus, during a second phase of the movement of the loading arm 20, the lever link 44 rotates anti-clockwise around the lever pivot axis 48. This rotates the traction arm 32 by relative to the main arm 30 counterclockwise around the pivot axis 56, so that the internal angle a between the traction arm 32 and the main arm 30 increases. The loading arm 20 is pivoted until it reaches the lifting configuration in which the container 12 reaches the ground (Figure 7).

In order to lift a container 12 and pull it on the rear of the chassis frame 16, the articulated loading arm 20 is pivoted anti-clockwise and the series of movements described above is reversed.

The configuration described above results in a lower trajectory of the hook 34, compared to the arrangements used previously. This results in a smaller maximum loading / unloading angle β of the container. This can reduce the spillage of a container during loading / unloading, reduce the need for space to store the container 12 and also allows the use of containers 12 having a lower height. For example, in an arrangement, the maximum angle of inclination β can be 20.3 ° for a container length of 5.5 m, a chassis frame height of 1050 mm and a length of the articulated loading arm of 5.3 m.

In addition, the mechanism which is at the origin of the movement of the traction arm 32 relative to the main arm 30 is more compact, compared to the arrangements used previously. This makes it possible to reduce the height of container slides 12. In addition, the mechanism is less complex than arrangements used previously, which reduces costs and weight.

The arrangement described above can also result in a reduced load on the auxiliary hydraulic cylinder 46, compared to the arrangements used previously. This allows a smaller hydraulic cylinder to be used which can result in a more compact arrangement.

The connection 40 is configured and the pivot axes are chosen, to produce the desired movement of the traction arm 32 relative to the main arm 30. It will be appreciated that the pivot axes can be arranged in other appropriate positions to produce the desired automatic movement of the traction arm relative to the main arm when the loading arm pivots. For example, the primary link 42 and the secondary link 46 could be attached to opposite sides of the lever link 44, and in some arrangements it may be possible to locate them on the same side of the lever link 44.

The hook loader 10 can also be used to tilt the container 12. With reference to FIG. 8, when the locking mechanism has locked the main arm 30 on the tilting frame 18, the main hydraulic cylinders 38 are actuated , which makes the tilting frame 18 pivot relative to the sub-frame 17 about the pivot axis 26. Since the main arm 30 and locked on the tilting frame 18, the articulated arm 20 and the container 12 all pivot both with the tilting frame 18 around the axis 26. When the tilting operation is complete, the jacks 38 are retracted and the tilting frame 18 is lowered. Next, the locking mechanism is actuated to lock the tilting frame 18 on the subframe 17 and separate the main arm 30 from the tilting frame 18. It should be noted that in other arrangements it may not no tilting function (only load / unload). In such arrangements, there may not be a tilting frame 18.

In the above arrangement, it has been described that the secondary link 46 comprises a hydraulic cylinder. However, in other arrangements, the secondary link 46 could be a bar or a rigid element. In addition, in other arrangements, the primary link 44 could, alternatively or additionally, comprise a hydraulic cylinder which can be actuated to move the traction arm 32 relative to the main arm 30.

It has been described that the auxiliary hydraulic cylinder 46 and the main hydraulic cylinders are actuated sequentially. However, the main hydraulic cylinders 38 and the auxiliary hydraulic cylinder 46 could be actuated simultaneously during loading or unloading.

It has been described that the lever link 44 is configured to produce an amplification of distance. However, the lever linkage 44 could be symmetrical (that is, 3063720, that is to say produce a mechanical advantage of 1) and could, for this, have equal distances from the first and second lever arms. It has been described that the traction arm 32 is provided with a hook 34, any other suitable coupling could be used for engagement with a container or other body.

It should be noted that the references in the sense and anticlockwise have been used with respect to the specific orientations in the drawings.

In the above arrangement, the loading mechanism has been described as part of a hook loading vehicle. However, the loading mechanism could be part of a hook-loading trailer that is configured to be hooked to a tractor and pulled.

Although it has been described that the articulated loading arm 20 has a first and a second phase of movement, where the internal angle a between the traction arm 32 and the main arm 30 decreases or increases respectively, the loading arm could have a single phase of movement or more than two phases of movement where the internal angle has decreased or increased alternately from the rest configuration to the lifting configuration and vice versa.

Although it has been described that the different pivot points are fixed, in other arrangements, these pivot points could be variable. For example, the primary link could be pivotally attached to the chassis while the pivot point can be moved relative to the frame.

Claims (24)

1. A loading mechanism for loading and unloading a body, comprising: a chassis (16, 17, 18), an articulated loading arm (20) pivotally attached to the chassis (16, 17, 18) and having a main arm (30) and a traction arm (32), and a connection (40) attached between the frame (16, 17, 18) and the traction arm (32) and comprising a primary connection (42), a lever connection (44) pivotally attached to the main arm (30) and a secondary link (46), characterized in that the link (40) is configured so that, in use, the pivoting of the loading arm (20 ) cause the traction arm (32) to move relative to the main arm (30). 2. Loading mechanism according to claim 1, characterized in that the primary link (42) is pivotally attached to the frame (16, 17, 18) and to the lever link (44). 3. Loading mechanism according to claim 1 or 2, characterized in that the secondary link (46) is pivotally attached to the lever link (44) and to the traction arm (32). 4. Loading mechanism according to one of the preceding claims, characterized in that the primary link (42) is pivotally attached to the lever link (44) on a first side (50) of the lever joint and in that the secondary link (46) is pivotally attached to the lever link (44) on a second, opposite side (52) of the lever joint. 5. Loading mechanism according to claim 4, characterized in that the first side (50) is on the side of the main arm which is opposite the chassis (16, 17, 18) and in that the second side (52) is on the side of the main arm which, when in use, faces the body (12). 6. Loading mechanism according to one of the preceding claims, characterized in that the lever link (44) comprises an inlet joint to which the primary link (42) is attached and an outlet joint to which the secondary link (46) is attached, and in that the distance between the output joint and the lever joint is greater than the distance between the input joint and the lever joint. 7. Loading mechanism according to one of the preceding claims, characterized in that the main arm (30) comprises an opening in which the lever link (44) can pivot. 8. Loading mechanism according to one of the preceding claims, characterized in that the connection is configured so that, during use, during a movement of the loading arm (20) from a rest configuration to a configuration the internal angle between the main arm (30) and the traction arm (32) decreases during at least one phase of movement. 9. Loading mechanism according to one of the preceding claims, characterized in that the connection is configured so that, during use, during a movement of the loading arm (20) from a rest configuration to a configuration the internal angle between the main arm (30) and the traction arm (32) increases during at least one phase of movement. 10. Loading mechanism according to claims 8 and 9, characterized in that the connection is configured so that the internal angle between the main arm (30) and the traction arm (32) decreases during a movement phase and increases during a next movement phase. 11. Loading mechanism according to one of the preceding claims, characterized in that the connection is configured so that, during use, the pivoting of the loading arm (20) causes one end of the traction arm (32) to move. ) on a path with a variable radius. 12. Loading mechanism according to one of the preceding claims, characterized in that the connection comprises a linear actuator (38) adapted to move the traction arm (32) relative to the main arm (30). 13. Loading mechanism according to claim 12, characterized in that the secondary link (46) comprises the linear actuator (38). 14. Loading mechanism according to claim 12 or 13, characterized in that the linear actuator (38) comprises a hydraulic cylinder. 15. Loading mechanism according to one of claims 12 to 14, characterized in that, in a resting configuration of the loading arm (20), at least part of the length of the linear actuator is located in a cavity defined by the main arm (30). 16. Loading mechanism according to claim 15, characterized in that, in the rest configuration, the primary link (42) and the lever link (44) are housed in a protected manner inside the main arm (30) . 17. Loading mechanism according to one of the preceding claims, characterized in that the main arm (30) is pivotally attached to the chassis (16, 17, 18). 18. Loading mechanism according to one of the preceding claims, characterized in that the main arm (30) and the traction arm (32) are pivotally attached. 19. Loading mechanism according to one of the preceding claims, characterized in that the traction arm (32) comprises a first and a second part (31, 33) which are substantially perpendicular to each other. 20. Loading mechanism according to claim 19, characterized in that the secondary link (46) is pivotally attached to the first part (31) of the traction arm (32) and in that the first part (31) is pivotally attached to the main arm (30). 21. Loading mechanism according to one of the preceding claims, characterized in that the traction arm (32) is provided with a coupling intended to be engaged with the body (12). 22. Loading mechanism according to one of the preceding claims, further comprising a linear actuator attached between the chassis (16, 17, 18) and the main arm (30) and adapted to pivot the loading arm (20). 23. Vehicle comprising a loading mechanism according to any one of the preceding claims. 24. Vehicle according to claim 23, characterized in that the vehicle is a hook-loading vehicle or a hook-loading trailer. ar4 U © GME 2 ί6Μ £ Ιο 3> G S r4- ir