Automatic leveling lifting table for handling

Abstract

The invention relates to a lifting handling table with automatic level adjustment (1), comprising: - a platform (2); - a supporting structure (3) comprising first (31), second (32) and third (33) parallel stringers extending along a longitudinal direction (X), comprising at least one beam (34) extending along a transverse direction (Y) and connecting the first, second and third stringers at a first longitudinal end, first and second openings (35, 36) being provided under the transverse beam (34) between the first and second stringers on one side and between the second and third stringers on the other, the second stringer (32) having a U-shaped section open upwards; - a vertical spring (41) comprising a first end acting on the platform (2) and a second end acting on the second stringer and housed in the second stringer between the first and second openings.Figure to be published with the abbreviation: Fig. 1.

Description

Title of the invention: Lifting table with automatic level adjustment

[0001] The invention relates to the field of handling packages or objects, and in particular the field of lifting tables or leveling tables intended to collect or distribute these packages and designed to be stackable by forklifts or stackers.

[0002] Known lifting tables comprise a platform sliding vertically relative to a chassis placed on the ground. The chassis comprises a space under a supporting structure, allowing the passage of fixed lower forks and lifting forks of the trolley to raise the table and allow it to move, with or without a load. One or more vertical springs are interposed between the supporting structure and the platform to allow the level of the platform to be adapted according to its load by their progressive elastic deformation. Such a table therefore proves to be particularly ergonomic for allowing manipulators to load and unload packages. In view of the loads that the lifting table must support, the supporting structure has metal crosspieces of a certain section, implying a significant vertical footprint. Thus, the loading capacity in volume of such a lifting table proves to be relatively limited.

[0003] The invention aims to solve one or more of these drawbacks. The invention thus relates to a lifting handling table with automatic level adjustment, comprising: -a tray; - a supporting structure comprising first, second and third parallel side members extending in a longitudinal direction, comprising at least one beam extending in a transverse direction and securing the first, second and third side members at a first longitudinal end, first and second openings being provided under the transverse beam between the first and second side members on the one hand and between the second and third side members on the other hand, the second side member comprising a U-shaped section open upwards; - a vertical spring comprising a first end stressing the plate and a second end stressing the second side member and housed in the second side member between the first and second openings.

[0004] According to one variant, the table comprises at least one lateral scissor system guiding the tabletop in sliding in the vertical direction.

[0005] According to another variant, the table comprises several vertical springs aligned according to the longitudinal direction and having their second end stressing the second spar and housed in the second spar between the first and second openings.

[0006] According to another variant, the first to third side members comprise a lower face intended to form a ground support surface.

[0007] According to yet another variant, the table comprises another beam extending in the transverse direction and securing the first to third side members at a second longitudinal end, the other beam being positioned vertically at the lower faces of the first to third side members.

[0008] According to another variant, the first and third side members are provided with rollers configured to allow the lifting table to roll.

[0009] According to another variant, the table comprises a gripping handle positioned above the level of the table top and secured to the supporting structure at the first longitudinal end of one of said side members.

[0010] The invention also relates to a handling system comprising:

[0011] -a lifting table as defined above;

[0012] -at least one guide rail for the third side member sliding in the longitudinal direction.

[0013] According to a variant, the system further comprises a mechanism for driving the longitudinal sliding of the supporting structure.

[0014] According to another variant, the third side member comprises a rack, and in which the drive mechanism comprises a lever and an engagement member capable of selectively engaging with the rack and actuated by the lever.

[0015] The invention also relates to the following variants. Those skilled in the art will understand that each of the features of the following variants can be independently combined with the above features, without constituting an intermediate generalization.

[0016] Other characteristics and advantages of the invention will emerge clearly from the description given below, for information purposes only and in no way limiting, with reference to the appended drawings, in which:

[0017] [Fig-1] is a perspective view of a self-leveling handling lifting table according to a first example of an embodiment of the invention;

[0018] [Fig.2] is a perspective sectional view of the lifting handling table of [Fig.l] at the level of a vertical spring;

[0019] [Fig.3] is a perspective view of a self-leveling handling lifting table according to a second example of an embodiment of the invention;

[0020] [Fig.4] is a perspective view of a self-leveling handling lifting table according to a third example of an embodiment of the invention;

[0021] [Fig.5] is a detailed perspective view of the lifting table of [Fig.4];

[0022] [Fig.6] is a perspective view of a lifting table for handling with adjustment automatic level according to a fourth example of an embodiment of the invention;

[0023] [Fig.7] is a perspective view of a self-leveling handling lifting table according to a fifth example of an embodiment of the invention.

[0024] [Fig. 1] is a perspective view of a self-adjusting handling lifting table 1 according to a first exemplary embodiment of the invention. The table 1 comprises a tray 2, a supporting structure 3 and a vertical spring 4L. [Fig. 2] is a perspective sectional view of the table 1 at the level of the spring 4L.

[0025] The supporting structure 3 comprises first, second and third parallel side members 31 to 33. These side members 31 to 33 extend in a longitudinal direction X. These side members 31 to 33 are used, where appropriate, to form supports on the ground of the table 1, to ensure its bending rigidity around a transverse axis Y and to ensure the connection between transverse beams.

[0026] The structure 3 comprises at least one beam 34 extending in the transverse direction Y and securing the side members 31 to 33 at a first longitudinal end. First and second openings 35 and 36 are provided under the transverse beam 34 between the first and second side members 31 and 32 on the one hand and between the second and third side members 32 and 33 on the other hand. The openings 35 and 36 serve to leave a longitudinal passage for forks of a forklift to be able to move the table 1 to another location and to allow the passage of the lower forks during loading with a stacker. The transverse beam 34 makes it possible both to secure the side members 31 to 33 and to form a lifting interface for the forks of a forklift.

[0027] The second spar 32 is here in a central position and has a U-shaped section open upwards. The vertical spring 41 has a first end stressing the plate 2 and a second end stressing the second spar 32. The elastic force provided by the spring 41 is proportional to the load applied to the plate 2 and makes it possible to automatically adapt the level along the vertical direction Z of the plate 2 according to the load. This system therefore ensures an ergonomic function, allowing a manipulator to always load the plate 2 to a satisfactory level, whatever the load already applied to the plate 2. The second end of the spring 41 is housed in the second side member 32 between the first and second openings 35 and 36, thanks to the upwardly open U-shaped section of this side member 32. The second end of the spring 41 is thus housed between vertical sides of this side member 32 and part of the spring can thus be housed close to the ground, on either side of the fork passage areas. The vertical size of the spring 41 can thus be reduced, which allows for a greater stroke for the platform 2 and thus allows greater loading under good ergonomic conditions. Furthermore, the platform 2 can be brought closer to the ground under load conditions, which ensures greater stability.

[0028] In the example illustrated in Figures 1 and 2, the lifting table 1 also comprises a lateral scissor mechanism 5 guiding the plate 2 in sliding in the vertical direction Z. This scissor mechanism 5 comprises two arms each having one end fixed either to the plate 2 or to the side member 33, and one end sliding longitudinally either relative to the plate 2 or relative to the side member 33. The arms are here mounted to pivot relative to each other around a transverse axis.

[0029] In the example illustrated here, the table 1 further comprises a beam 37 extending in the transverse direction Y and securing the side members 31 to 33 at a second longitudinal end. The beam 37 comprises openings for the passage of the forks of a forklift or a stacker and makes it possible to form a lifting or gripping interface for these forks.

[0030] In the example illustrated here, the table 1 comprises several vertical springs 41 and 42 aligned in the longitudinal direction X and having their second end stressing the second spar 32 and housed in the second spar between the first and second openings 35 and 36. It is thus possible to have greater spring stiffness and distribute the elastic force over the longitudinal direction.

[0031] In the example illustrated here, the side members 31, 32 and 33 have a lower face intended to form a ground support surface.

[0032] In the example illustrated here, the supporting structure 3 of the table 1 comprises another beam 38 extending in the transverse direction Y and securing the side members 31 to 33 at their second longitudinal end. This other beam 38 is positioned vertically at the lower faces of the side members 31 to 33. This other beam 38 makes it possible to further stiffen the table 1 and improve its stability on the ground. A vertical spring 43 here stresses on the one hand this other beam 38 and on the other hand the table top 2

[0033] [Fig. 3] is a perspective view of a second exemplary embodiment of a table 1. The side members 31 to 33 are here advantageously provided with casters 39 configured to allow the lifting table 1 to roll. The casters 39 make it possible to ensure movement, for example longitudinal sliding of the table 1 to facilitate its loading by a simple advance if table 1 is positioned in a shelf. The casters 39 are here arranged at the longitudinal ends of the side members 31 to 33.

[0034] The table 1 of [Fig. 3] is advantageously integrated into a system including a guide rail 6 (the system here includes two rails positioned on either side of the table 1). The guide rail 6 ensures the longitudinal sliding guidance of the beam 33. Such a guide rail 6 proves to be particularly advantageous for allowing advances / retreats of a table 1 in a warehouse rack.

[0035] Advantageously, the system is provided with a stop 61 configured to interfere with a second longitudinal end of the spar 33, and thus restrict its longitudinal sliding, to avoid accidentally hitting other elements.

[0036] Advantageously, the system is provided with a drive mechanism 7 for the longitudinal sliding of the spar 33. Such a sliding drive mechanism 7 makes it possible to extend the table 1 relative to the rail 6 by manual force. In the example illustrated, the spar 33 comprises a rack 331. The drive mechanism 7 here comprises a substantially vertical lever 71 and a gripping member 72 capable of selectively engaging with the rack 331. The gripping member 72 is actuated by the lever 71. Such a mechanism makes it possible to exert an exit force on the table 1 by benefiting from the large lever arm offered by the lever 71.

[0037] [Fig. 4] is a perspective view of a third exemplary embodiment of a table 1. The lifting table 1 here comprises a gripping handle 8 (here positioned above the level of the tabletop 2) to facilitate its handling by an operator, for example to simply slide it longitudinally. The handle 8 is secured to the supporting structure 3 at the first longitudinal end of the side member 33. A similar handle is secured to the first longitudinal end of the side member 31. The handle 8 is here secured to the supporting structure 3 by means of a tube 81. A spring is compressed longitudinally (not shown here) by the table 1 when it is retracted, to allow on the one hand to brake the table 1 when it is retracted, and to allow the table 1 to be accompanied when it is extended.

[0038] Advantageously, the rail 6 is provided with a front stop 62 and a rear stop to restrict the sliding of the table 1. The front and rear stops are configured to interfere with a wedge 30 secured to the supporting structure 3. By placing the front stops 62 and rear stops on the rail, the travel of the table 1 relative to the rail 6 can be increased.

[0039] The wedge 30 advantageously comprises front and rear buffers, between which a longitudinal spring system is interposed. The spring system makes it possible either to dampen the retraction movement of the table 1, or to facilitate the extension movement of the table 1.

[0040] [Fig. 5] illustrates a mechanism 9 for locking or releasing the table 1 relative to the rail 6. The table 1 is provided with a lug 310 projecting transversely relative to the side member 31, at its front part. The locking mechanism comprises a handle 91, pivotally mounted relative to a base 92 anchored in the ground. The handle 91 comprises a gripping projection 93 intended to pivot it when stressed. The handle 91 also comprises a notch 94, intended to engage with the lug 310. When the table 1 is moved back, the lug 310 interferes with the projection 93, pivots the handle 91 and is inserted into the notch 94 to lock the table 1 in the retracted position. To release table 1, the operator lifts projection 93 to release lug 310 from notch 94.

[0041] [Fig. 6] is a perspective view of a fourth exemplary embodiment of a table 1. The lifting table 1 here comprises scissors 5 positioned at the transverse ends of the plate 2. The scissors 5 each comprise two arms 51 and 52 as described previously. In order to stiffen the structure, the arms of the two scissors are secured by means of a cross-member structure 53. The cross-member structure 53 may comprise one or more beams oriented transversely, crossed and / or inclined relative to the transverse direction, in order to stiffen the connection between the supporting structure 3 and the plate 2.

[0042] [Fig. 7] is a perspective view of a lifting handling table with automatic level adjustment according to a fifth example of an embodiment of the invention. In this example, the retraction and / or extension movement of the table 1 is obtained by means of a pneumatic cylinder 70, urging the supporting structure 3 longitudinally.

Claims

Claims

1. Lifting table for handling with automatic level adjustment (1), characterized in that it comprises: - a platform (2); - a supporting structure (3) comprising first (31), second (32) and third (33) parallel longitudinal members extending in a longitudinal direction (X), comprising at least one beam (34) extending in a transverse direction (Y) and securing the first, second and third longitudinal members at a first longitudinal end, first and second openings (35, 36) being provided under the transverse beam (34) between the first and second longitudinal members on the one hand and between the second and third longitudinal members on the other hand, the second longitudinal member (32) comprising a U-shaped section open upwards;- a vertical spring (41) comprising a first end stressing the plate (2) and a second end stressing the second side member and housed in the second side member between the first and second openings.;

2. Self-leveling handling lifting table (1) according to claim 1, comprising at least one lateral scissor system (5) guiding the table (2) in sliding in the vertical direction (Z).

3. Self-leveling handling lifting table (1) according to claim 1 or 2, comprising several vertical springs (41, 42) aligned in the longitudinal direction (X) and having their second end biasing the second longitudinal member (32) and housed in the second longitudinal member between the first and second openings (35, 36).

4. Self-leveling handling lifting table (1) according to any one of the preceding claims, wherein the first to third side members (31, 32, 33) have a lower face intended to form a ground support surface.

5. A self-leveling lifting handling table (1) according to claim 4, comprising another beam (38) extending in the transverse direction and securing the first to third side members at a second longitudinal end, the other beam (38) being positioned vertically at the in- lower parts of the first to third side members (31, 32, 33).

6. A self-leveling handling lifting table (1) according to any one of claims 1 to 3, wherein the first and third side members (31, 33) are provided with casters (39) configured to allow the lifting table (1) to roll.

7. Self-leveling handling lifting table (1) according to any one of the preceding claims, comprising a gripping handle (8) positioned above the level of the table (2) and secured to the supporting structure (3) at the first longitudinal end of one of said side members.

8. Handling system comprising: - a lifting table according to any one of the preceding claims; - at least one guide rail (6) of the third side member (33) sliding in the longitudinal direction.

9. System according to claim 8, further comprising a drive mechanism (7) for longitudinal sliding of the supporting structure (3).

10. A system according to claim 9, wherein the third spar (33) comprises a rack (331), and wherein the drive mechanism (7) comprises a lever (71) and an engagement member (72) capable of selectively engaging the rack (331) and actuated by the lever (71).

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