FR3112133A1 - Unloading dock equipped with at least one unloading device with an improved shutter - Google Patents

Abstract

Unloading dock equipped with at least one unloading device comprising an improved shutter The subject of the invention is an unloading dock comprising: at least one flap (22) pivoting about a substantially horizontal axis of rotation (A22) parallel to a vertical wall (14) of the dock, configured to occupy a raised position and an inclined position, as well as an operating mechanism (46) of the flap (22), characterized in that the flap (22) comprises at least one abutment (48) configured to bear against the unloading dock when the flap (22) is in an inclined position. This stop (48) ensures the transmission of at least part of the forces between the shutter (22) and the unloading dock, which contributes to reducing the forces generated by the shutter (22) on the operating mechanism (46). Figure 8

Description

Unloading dock equipped with at least one unloading device comprising an improved shutter

The present application relates to an unloading dock equipped with at least one unloading device comprising an improved shutter.

According to one embodiment, an unloading dock of a waste collection center comprises an upper area at the level of which vehicles to be unloaded circulate, a lower area at the level of which at least one skip is positioned as well as at least one vertical wall connecting the upper and lower areas, the dumpster being attached to the vertical wall. According to one configuration, the upper area includes at least one acroterion which runs along the vertical wall to prevent vehicles driving on the upper area from falling.

To secure the upper area, a guardrail, positioned above the acroterion, runs along the vertical wall. Such a guardrail comprises at least two vertical uprights surmounting the acroterion as well as at least one horizontal rail, connecting the uprights, positioned at a certain height to prevent people from tipping towards the lower area while allowing the unloading of waste between the acroterion and the lowest rail.

To prevent the waste from falling between the vertical wall and the dumpster, the document FR2981966 proposes an unloading device which comprises, in addition to the guardrail, a flap pivoting around a horizontal axis of rotation positioned just above the parapet, between a substantially vertical raised position closing the space between the parapet and the rail of the railing as well as a position inclined towards the bucket in which the shutter projects with respect to the vertical wall and makes it possible to transfer waste from the upper area to the dumpster. The unloading device also includes a flap operating mechanism to tilt it from one position to another.

According to another embodiment described in the document FR3029187, an unloading device comprises a fixed unloading platform, substantially flat and horizontal, positioned above the acroterion, which overflows on either side of the parapet and includes an extension projecting from the vertical wall. In operation, the waste is dumped on this unloading platform before being pushed towards the skip. The unloading device also includes a flap pivoting around a horizontal axis of rotation positioned against the vertical wall, under the extension of the unloading platform, as well as a mechanism for maneuvering the flap. According to this document FR3029187, the shutter can occupy a substantially vertical raised position and an inclined position towards the skip in the extension of the extension of the unloading platform.

Whatever the position of the shutter, the unloading platform of this device comprises a part, projecting from the vertical wall, which is likely to be damaged when the skip is lifted during its withdrawal.

According to another embodiment described in the document WO2010148426, the unloading device comprises a frame having two arms projecting with respect to the vertical wall as well as a mobile unloading platform, positioned above the upper area on which the waste is dumped. This unloading platform comprises several parts hinged together along substantially horizontal axes of rotation. Thus, the unloading platform comprises a part, the closest to the bucket, pivoting with respect to a rotation axis positioned at the end of the frame arms. The secure unloading device comprises a mechanism for maneuvering the mobile unloading platform allowing it to be pivoted from a substantially horizontal position to an inclined position to cause the waste to fall into the dumpster.

Whatever the embodiment, the maneuvering mechanisms are complex and imposing because they must ensure the recovery of the forces generated by a shutter or an inclined platform on which transits or is present waste which can be heavy. These forces are all the greater when the shutter or the platform has a reinforced structure increasing their mass.

The present invention aims to remedy all or part of the drawbacks of the prior art.

To this end, the subject of the invention is an unloading dock comprising at least one unloading device comprising at least one flap pivoting around a substantially horizontal axis of rotation and parallel to a vertical wall of the dock, offset towards an area of movement relative to the vertical wall, the shutter being configured to occupy a raised position and an inclined position, characterized in that the shutter comprises at least one stop configured to bear against the unloading dock when the shutter is in the inclined position.

This stop ensures the transmission of at least part of the forces between the shutter and the unloading dock, which contributes to reducing the forces generated by the shutter on an operating mechanism which can then be simplified.

1. la butée se présente sous la forme d’une plaque ou un pan d’une plaque qui s’étend d’un bord latéral à l’autre du volet et qui est configurée pour prendre appui contre une paroi et/ou une face verticale du quai de déchargement lorsque le volet est en position inclinée ;
2. le volet comprend une première plaque présentant :
   1. une partie centrale qui s’étend d’un premier bord longitudinal jusqu’à un deuxième bord longitudinal et d’un bord latéral à l’autre du volet,
   2. des première et deuxième ailes positionnées au niveau des bords latéraux du volet et pliées à 90° par rapport à la partie centrale, chacune des première et deuxième ailes comportant un premier bord formant avec ladite partie centrale un angle compris entre 100 et 120° ;
3. le volet a une structure en caisson.

According to other characteristics taken individually or in combination:

1. the abutment is in the form of a plate or a section of a plate which extends from one side edge to the other of the shutter and which is configured to bear against a wall and/or a vertical face of the unloading dock when the shutter is in an inclined position;
2. the flap comprises a first plate having:
   1. a central part which extends from a first longitudinal edge to a second longitudinal edge and from one side edge to the other of the flap,
   2. first and second wings positioned at the side edges of the flap and bent at 90° with respect to the central part, each of the first and second wings comprising a first edge forming with said central part an angle of between 100 and 120°;
3. the shutter has a box structure.

Other characteristics and advantages will emerge from the description of the invention which follows, description given by way of example only, with regard to the appended drawings, among which:

is a perspective view from an upper area of two unloading devices, one of them having a flap in a raised position and the other a flap in an inclined position, illustrating an embodiment of the invention,

is a perspective view from a lower area of two unloading devices having flaps in an inclined position, illustrating an embodiment of the invention,

is a perspective view of an unloading device with a flap in the raised position illustrating an embodiment of the invention,

is a perspective view of part of the unloading device visible in Figure 4 with a flap in an inclined position,

is a perspective view of an operating mechanism, without cover, illustrating an embodiment of the invention,

is a perspective view of part of the operating mechanism visible in Figure 5,

is a side view of one end of a segment of the operating mechanism visible in Figure 5,

is a cross-section of an unloading device illustrating an embodiment of the invention,

is a perspective view of part of the flap of the unloading device visible in Figure 8,

is a perspective view and cross-section of the unloading platform illustrating one embodiment of the invention, and

is a perspective view and a cross-section of a support connecting the flap and the platform of the unloading device visible in Figure 8.

According to one embodiment visible in Figures 1, 2 and 3, an unloading dock of a waste disposal center comprises at least a first circulation area 10 at the level of which vehicles to be unloaded can circulate, at least a second area 12, offset downwards with respect to the first area 10 as well as at least one vertical wall 14 connecting the first and second areas 10, 12.

The vertical wall 14 is long enough to allow a bucket 16 positioned on the second area 12 to be attached to it.

According to one configuration, the waste disposal center comprises several unloading docks, each with a vertical wall 14 and a bucket 16, the different vertical walls 14 of the different docks being offset from each other.

According to one embodiment, the first area 10 comprises at least one parapet 18 which runs along at least one vertical wall 14 and which has a first face F18.1 extending the vertical wall 14, a second face F18.2 opposite the first face F18.1 as well as an upper face F18.3, connecting the first and second faces F18.1, F18.2, substantially parallel to the first area 10.

Each unloading dock comprises at least one secure unloading device 20.

According to a configuration visible in Figures 1 and 2, the unloading dock comprises two unloading devices 20, positioned one after the other along the vertical wall 14. Of course, the invention is not limited to this number of unloading devices for each of the unloading bays.

Each unloading device 20 comprises at least one flap 22 pivoting around a substantially horizontal axis of rotation A22 and parallel to the vertical wall 14, positioned above the acroterion 18, on the side of the first area 10 with respect to the vertical wall 14. This flap 22 has a first longitudinal edge 22.1 connected to the axis of rotation A22, a second longitudinal edge 22.2 parallel to the first longitudinal edge 22.1 and two side edges 22.3, 22.4 substantially perpendicular to the axis of rotation A22 . It also has a first face F22, substantially flat and smooth, as well as a second face F22' opposite the first face F22. The flap 22 is configured to occupy a raised position, substantially vertical, in which the first face F22 is oriented towards the first area 10 as well as an inclined position in which the first face F22 is oriented upwards and the second longitudinal edge 22.2 offset downwards with respect to the first longitudinal edge 22.1. Thus, in an inclined position, the waste present on the flap 22 tends to slide from the first longitudinal edge 22.1 towards the second longitudinal edge 22.2 in the direction of the bucket 16.

According to a non-limiting embodiment, the unloading device 20 comprises at least one unloading platform 24. The latter comprises an upper wall 26 offset upwards with respect to the upper face F18.3 of the acroterion 18 and having a part offset with respect to the acroterion 18 in the direction of the first area 10.

The upper wall 26 is slightly inclined, towards the vertical wall 14, to promote the sliding of waste dumped on the upper wall 26 in the direction of the bucket 16. According to one configuration, the unloading platform 24 and the shutter 22 are configured such that when the flap 22 is in the inclined position, the flap 22 and the upper wall 26 have substantially the same inclination. The angle formed between a horizontal plane and the upper wall 26 or the first face F22 of the flap 22 is between 10 and 30°. This angle has a value of the order of 18°.

According to one configuration, the upper wall 26 of the unloading dock 24 has a first longitudinal edge 26.1 oriented towards the flap 22, substantially parallel and attached to the first longitudinal edge 22.1 of the flap 22, a second longitudinal edge 26.2 parallel and opposite the first longitudinal edge 26.1 as well as two side edges 26.3, 26.4.

According to one configuration, the upper wall 26 has a length (distance separating the side edges 26.3, 26.4) substantially equal to that of the flap 22. Thus, the side edges 26.3, 26.4 of the upper wall 26 of the unloading platform 24 are aligned with the side edges 22.3, 22.4 of the flap 22.

According to an embodiment visible in Figures 8 and 10, the unloading platform 24 also comprises a front wall 28, substantially vertical, positioned plumb with the second longitudinal edge 26.2 of the upper wall 26, as well as two deflectors 30 positioned at the level of the side edges 26.3, 26.4 having a part located above the upper wall 26. This front wall 28 can be extended by a return 32, bent at 90° with respect to the front wall 28, positioned under the upper wall 26, resting on the first area 10 in operation. According to one design, the top wall 26, the front wall 28, the return 32 are obtained from a single folded plate. To stiffen it, the unloading platform 24 can comprise one or more reinforcement(s), such as for example transverse reinforcements 34, perpendicular to the front wall 28, connecting the upper wall 26 and the return 32.

The first longitudinal edge 26.1 of the upper wall 26 of the unloading platform 24 is parallel to the vertical wall 14. According to one arrangement, the first longitudinal edge 26.1 of the upper wall 26 of the unloading platform 24 is positioned approximately plumb with the second face F18.2 of the acroterion 18. Of course, the invention is not limited to this position for the first longitudinal edge 26.1 of the upper wall 26, which could be offset from to the second face F18.2 of acroterion 18.

According to one embodiment, the first longitudinal edge 22.1 of the flap 22 is connected directly or indirectly by at least one intermediate part (visible in FIGS. 8 and 11) to the first longitudinal edge 26.1 of the upper wall 26 of the platform of unloading 24 by a plurality of hinges 36 which form the axis of rotation A22 of the shutter 22. In the presence of hinges 36, the first longitudinal edge 26.1 of the upper wall 26 of the unloading platform 24 comprises, for each hinge 36 , a notch 38 (visible in Figure 10) configured to accommodate the hinge 36.

Of course, the invention is not limited to this embodiment for the axis of rotation A22 of the flap 22.

According to a non-limiting configuration, the unloading device 20 comprises at least one guardrail 40 positioned above the acroterion 18, along the vertical wall 14. Such a guardrail 40 comprises at least two uprights 40.1, 40.2 vertical , positioned on either side of the flap 22, approximately in the extension of the axis of rotation A22, as well as at least one horizontal smooth 40.3, connecting the uprights 40.1, 40.2, positioned at a certain height to prevent people to switch to the second area 12 while allowing the unloading of waste between the acroterion 18 and the lowest rail 40.3.

According to one embodiment, the unloading device 20 comprises a support S making it possible to raise the axis of rotation A22 of the flap 22 relative to the upper face F18.3 of the acroterion 18. This support S comprises a first angle iron 42 which extends over the entire length of the unloading device 20. This first angle 42 comprises a first substantially vertical wing 42.1 as well as a second inclined wing 42.2 on which rests and is fixed the first longitudinal edge 26.1 of the upper wall 26 of the unloading platform 24. The hinges 36 of the axis of rotation A22 of the shutter 22 are also fixed on this second wing 42.2. This first angle iron 42 ensures the recovery of the vertical forces, in particular the weight of the waste. According to one configuration, the first wing 42.1 is pressed at each of its ends against the uprights 40.1, 40.2 of the guardrail 40. In parallel, the second wing 42.2 extends between the uprights 40.1, 40.2 and has a length substantially equal to the distance separating the uprights 40.1, 40.2.

The support S comprises a second angle iron 44 having a first wing 44.1 pressed against and fixed against the second face F18.2 of the acroterion 18 as well as a second wing 44.2 pressed against the upper face F18.3 of the acroterion 18.

According to one configuration, the first wing 42.1 of the first angle iron 42 is connected to the second wing 44.2 of the second angle iron 44 by at least one weld bead C. The first wings 42.1 and 44.1 of the first and second angle irons 42, 44 are parallel and spaced apart by a distance substantially equal to the width L40 of the uprights 40.1, 40.2 of the guardrail 40.

This support S makes it possible to connect the unloading platform 24 to the acroterion 18.

The unloading device 20 comprises at least one operating mechanism 46 of the flap 22 allowing the flap 22 to be pivoted from the raised position to the inclined position or vice versa.

According to a feature of the invention, the flap 22 comprises at least one stop 48 configured to bear against a part of the unloading dock such as the vertical wall 14 and/or the acroterion 18 when the flap 22 is in an inclined position. Each stop 48 is configured to bear against a wall and/or a vertical face of the unloading dock.

According to one configuration, the flap 22 comprises a stop 48 in the form of a plate or a section of a plate which extends from one side edge to the other. This solution makes it possible to increase the contact surface between the flap 22 and the unloading dock. Alternatively, each flap 22 may include two stops 48 positioned at each of the ends of the flap 22, at its side edges 22.3, 22.4.

According to one embodiment visible in Figure 9, the flap 22 comprises a first plate 50 having a central part 52 which extends from the first longitudinal edge 22.1 to the second longitudinal edge 22.2 and from one side edge to the other 22.3, 22.4. This first plate 50 has first and second wings 54, 56 positioned at the side edges 22.3, 22.4 of the flap 22. These first and second wings 54, 56 are bent at 90° with respect to the central part 52.

The first plate 50 may comprise a third wing 58 bent at 90° with respect to the central part 52 positioned in line with the second longitudinal edge 22.2, which may be extended by a flange 59 parallel to the central part 52, as illustrated in the figure 8.

Each of the first and second wings 54, 56 comprises a first edge 54.1, 56.1 extending from the central part 52 of the first plate 50, forming with said central part 52 an angle α of between 100 and 120°. Each first edge 54.1, 56.1 is approximately parallel to the wall and/or to the vertical face of the unloading dock against which the flap 22 rests when it is in an inclined position. Each wing 54, 56 also includes a second edge 54.2, 56.2 to the right of the third wing 58 as well as a third edge 54.3, 56.3 connecting the first and second edges 54.1, 56.1, 54.2, 56.2 by forming an inward V. According to one configuration, the flap 22 comprises a plate pressed against the first edges 54.1, 56.1 of the wings 54, 56, which extends from one side edge to the other of the flap 22 and provides the stop function 48. In l absence of a plate, the first edges 54.1, 56.1 of the wings 54, 56 can provide the stop function.

To give an order of magnitude and by way of example only, the central part 52 has a length (distance between the lateral edges 22.3, 22.4) of the order of 2500 mm and a width (distance between the first and second longitudinal edges 22.1, 22.2) of the order of 545 mm. The first and second edges 54.1, 56.1, 54.2, 56.2 of the first and second wings 54, 56 have a length of the order of 90 mm and are separated by a distance of the order of 350 mm.

According to another feature, the flap 22 comprises a box shape to stiffen it. This solution makes it possible, for equal resistance, to reduce the mass of the flap 22. For this purpose, the flap 22 comprises a second plate 60 which extends from one side edge to the other of the flap 22 and has a first face 62 flattened and fixed against the first plate 50, between the first longitudinal edge 22.1 and the first edges 54.1, 56.1 of the first and second wings 54, 56, a second face 64 bears against the first edges 54.1, 56.1 of the first and second wings 54 , 56, a third face 66 in the extension of part of the third edges 54.3, 56.3 of the first and second wings 54, 56 as well as a last face 68 plated and fixed against the first plate 50. The second plate 60 can comprise a pan 70 inserted between the third pan 66 and the last pan 68, substantially perpendicular to the first plate 50, positioned at the level of the point of the V formed by the third edges 54.3, 56.3 of the wings 54, 56. Whatever the mode embodiment, the second plate 60 comprises at least two flats 62, 68 pressed against and fixed against the first plate 50 as well as at least a spaced part of the first plate 50 between the two flats 62, 68 to form a box structure.

When the second plate 60 comprises a flat 64 pressed against the first edges 54.1, 56.1 of the wings 54, 56, this flat 64 performs the function of abutment 48 and makes it possible to increase the bearing surface of the flap 22 against the vertical wall 14 or parapet 18.

Whatever the embodiment, the flap 22 comprises at least one abutment 48 resting against the unloading dock, more particularly against a wall and/or a substantially vertical face, when the flap 22 is in an inclined position, ensuring the transmission at least part of the forces between the flap 22 and the unloading dock, which contributes to reducing the forces generated by the flap 22 on the operating mechanism 46. Advantageously, each stop 48 offers a contact surface with the loading dock. substantially vertical unloading when the flap 22 is in an inclined position. This configuration ensures better transmission of forces between the flap 22 in the inclined position and the unloading dock.

According to one configuration, the unloading device 20 comprises a single operating mechanism 46 positioned at one end of the flap 22, close to one of its side edges 22.3, 22.4. According to another configuration, the unloading device 20 comprises two operating mechanisms 46, positioned at each of the ends of the shutter 22, close to each side edge 22.3, 22.4 of the shutter 22.

According to one embodiment, each operating mechanism 46 comprises a substantially vertical upright 72, a compass 74 comprising first and second segments 76, 78 interconnected by a first horizontal pivot axis A74, the first segment 76 being connected to the upright 72 by a second horizontal pivot axis A76, the second segment 78 being connected to the flap 22 by a third horizontal pivot axis A78. Thus, compass 74 is configured to occupy a folded state, visible in FIG. 3, corresponding to the raised position of flap 22, in which segments 76, 78 form between them an acute angle as well as an unfolded state, visible on Figures 3 and 4, corresponding to the inclined position of the flap 22, in which the segments 76, 78 form between them a substantially flat angle.

The operating mechanism 46 also comprises a lever 80 connected to the first segment 76 to facilitate the passage from one state to the other of the compass 74. It also comprises a return means 82, such as a tension spring, to assist the passage from the unfolded state (corresponding to the inclined position of the flap 22) to the folded state (corresponding to the raised position of the flap 22).

According to one embodiment, the second segment 78 is connected to one of the wings 54, 56, near the second longitudinal edge 22.2 of the flap 22. The upright 72 comprises near its upper end 72.1 a yoke 84 supporting the second pivot pin A76. In addition, the first segment 76 comprises two parallel branches, interconnected, forming at a first end 76.1 a clevis supporting the first pivot axis A74 and at a second end 76.2 a clevis supporting a tube 86 in which the lever 80 is fitted. The tube 86 is connected to the first segment 76 in such a way that the lever is substantially vertical when the compass 74 is in the folded state and the flap 22 is in the inclined position.

Each branch of the first segment 76 comprises an orifice 88, spaced from the second end 76.2 to accommodate the second pivot pin A76. The branches of the first segment 76 also support a fixing pin 90 allowing the return means 82 to be attached.

According to one embodiment, the upright 72 is in the form of a U-shaped angle iron 92 having a cutout 94 to allow the first segment 76 to pass as well as a fixing pin 96 to attach the return means 82.

According to one configuration, the operating mechanism 46 comprises an indexing system 98 to maintain the compass 74 either in the folded state or in the unfolded state. This indexing system 98 comprises an indexing finger 100 horizontally movable between an extended position and a retracted position as well as first and second orifices 102.1, 102.2, crossing the first segment 76, configured so that the first orifice 102.1 houses the indexing finger 100 in the extended position when the compass 74 is in the folded state and the second orifice 102.2 houses the indexing finger 100 in the extended position when the compass 74 is in the unfolded state.

A cover 104, visible in particular in Figure 1, can be provided to dress the upright 72.

Because part of the forces generated by the flap 22 is transmitted to the unloading dock via at least one stop 48 of the flap 22 and not to the operating mechanism 46, the latter can be simplified. In addition, the lever 80 makes it possible to increase the force exerted by the user to tilt the flap from the inclined position to the raised position. Finally, the return means 82 makes it possible to compensate for part of the weight of the flap 22 and to reduce the force exerted by the user necessary to tilt the flap 22 from the inclined position to the raised position.

Finally, unlike the solution proposed by document FR3029187, the unloading device does not include any element projecting from the vertical wall 14 when the flap 22 is in the raised position, which makes it possible to limit the risks of damage to the device during the removal of the dumpster.

Claims (10)

Unloading dock comprising a first area (10), a second area (12) offset downwards with respect to the first area (10), at least one vertical wall (14) connecting the first and second areas (10, 12) as well as at least one unloading device (20) comprising at least one flap (22) pivoting around a substantially horizontal axis of rotation (A22) and parallel to the vertical wall (14), offset towards the first area (10 ) relative to the vertical wall (14), the flap (22) having a first longitudinal edge (22.1) connected to the axis of rotation (A22), a second longitudinal edge (22.2) parallel to the first longitudinal edge (22.1) as well as side edges (22.3, 22.4), the flap (22) being configured to occupy a raised position and an inclined position in which the second longitudinal edge (22.2) is offset downwards with respect to the first longitudinal edge (22.1) , characterized in that the shutter (22) comprises at least one abutment (48) configured for r lean against the unloading dock when the shutter (22) is in the inclined position. Unloading dock according to Claim 1, characterized in that the abutment (48) is in the form of a plate or a section of a plate which extends from one side edge to the other of the flap (22) and which is configured to bear against a wall and/or a vertical face of the unloading dock when the flap (22) is in an inclined position. Unloading dock according to Claim 1 or 2, characterized in that the flap (22) comprises a first plate (50) having a central part (52) which extends from the first longitudinal edge (22.1) to the second longitudinal edge (22.2) and from one side edge to the other (22.3, 22.4) as well as first and second wings (54, 56) positioned at the level of the side edges (22.3, 22.4) of the flap (22) and folded at 90 ° relative to the central part (52), each of the first and second wings (54, 56) comprising a first edge (54.1, 56.1) approximately parallel to the wall and/or to the vertical face of the unloading dock against which bearing the flap (22) when it is in the inclined position. Unloading dock according to the preceding claim, characterized in that the first edges (54.1, 56.1) of the first and second wings (54, 56) form with the said central part (52) an angle of between 100 and 120°. Unloading dock according to Claim 3 or 4, characterized in that the first plate (50) comprises a third wing (58) bent at 90° with respect to the central part (52), positioned at the level of the second longitudinal edge (22.2 ) and in that each of the first and second wings (54, 56) comprises a second edge (54.2, 56.2) to the right of the third wing (58) as well as a third edge (54.3, 56.3) connecting the first and second edges (54.1, 56.1, 54.2, 56.2) forming an inward V. Unloading dock according to one of Claims 3 to 5, characterized in that the flap (22) comprises a second plate (60) comprising at least two flats (62, 68) pressed against and fixed against the first plate (50) as well at least a spaced portion of the first plate (50) between the two sections (62, 68) to form a box structure. Unloading dock according to Claims 5 and 6, characterized in that the second plate (60) extends from one side edge to the other of the shutter (22) and has a first flat (62) pressed against and fixed against the first plate (50), between the first longitudinal edge (22.1) and the first edges (54.1, 56.1) of the first and second wings (54, 56), a second face (54) pressed against the first edges (54.1, 56.1) first and second wings (54, 56), a third face (66) in the extension of part of the third edges (54.3, 56.3) of the first and second wings (54, 56) as well as a last face (68 ) plated and fixed against the first plate (50). Unloading dock according to one of the preceding claims, characterized in that the unloading dock comprises at least one operating mechanism (46) for the flap (22) comprising:

1. a substantially vertical upright (72),
2. a compass (74) having first and second segments (76, 78) interconnected by a first horizontal pivot pin (A74), the first segment (76) being connected to the upright (72) by a second pivot pin ( A76) horizontal, the second segment (78) being connected to the flap (22) by a third pivot axis (A78) horizontal,
3. the compass (74) being configured to occupy a folded state, corresponding to the raised position of the flap (22), in which the segments (76, 78) form between them an acute angle, and an unfolded state, corresponding to the inclined position of the shutter (22), in which the segments (76, 78) form between them a substantially flat angle.

Unloading dock according to the preceding claim, characterized in that the operating mechanism (46) comprises a lever (80) connected to the first segment (76) of the compass (74) to facilitate the passage from one state to the other of the compass (74). Unloading dock according to Claim 8 or 9, characterized in that the maneuvering mechanism (46) comprises a return means (82) to assist the transition from the unfolded state to the folded state.