WO2023179880A1

WO2023179880A1 - Lift table assembly

Info

Publication number: WO2023179880A1
Application number: PCT/EP2022/058012
Authority: WO
Inventors: Marco HANKE
Original assignee: Flexlift Hubgeräte Gmbh
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2023-09-28

Abstract

The invention relates to a lift table assembly (1) comprising a base frame (19, 29) and a first scissor-type lift table (10) located thereon. The lift table assembly (1) also comprises at least one second scissor-type lift table (20), wherein each scissor-type lift table comprises scissor-type structures (12, 13; 22, 23) which can be pivoted relative to one another about a centre bearing (14, 24). The scissor-type structures (12, 13; 22, 23) are coupled via corresponding fixed bearings (16, 15; 26, 25) and with the base frame (19, 29) on one side and an upper frame (11, 21) of the scissor-type lift table (10, 20). The scissor-type lift tables (10, 20) can be moved from a retracted position into an extended position by means of at least one drive (7). The lift table assembly is designed in such a way that the at least one second scissor-type lift table (20) moves between the retracted and the extended position when the first scissor-type lift table (10) moves at least in sections.

Description

LIFT TABLE ARRANGEMENT

TECHNICAL FIELD

The invention relates to a lifting table arrangement, which comprises a base frame and a first scissor lifting table arranged thereon and at least one second scissor lifting table, with features according to claim 1.

STATE OF THE ART

Scissor lift tables for lifting and lowering loads, such as those used in the automotive industry or on other assembly lines, have been known for a long time. The basic principle is that a platform carrying the load is raised or lowered by means of two scissors arranged laterally parallel to one another by opening and closing the scissor legs. The ends of the scissors are each arranged with bearings on the base plate or on the platform. As a rule, fixed bearings, i.e. bearings fixed to the scissors and platform or base plate, are arranged on one side, and loose bearings are arranged on the other side, which can be moved relative to the platform or base plate.

Four examples of scissor lift tables are given below. They obey the same principle described above and differ only in the drive: DE 90 05 566 U1 discloses a lifting table with a spindle drive. DE 100 66 404 B4 discloses a scissor lifting table with a pallet truck that is guided over a link in order to achieve sufficient power transmission even when the lifting table is extremely folded. The scissor lift table disclosed in DE 20316 905 U1 raises a scissor arm using a cam and DE 102012 012 934 A1 discloses a belt drive.

What all examples have in common is that they raise and/or lower an object or person who is on the platform relative to the base plate or the surrounding floor. This is used, for example, when assembling larger objects such as motor vehicles, engines or machines. Here, the work to be done should be carried out at a working height that is comfortable and ergonomically sensible for the fitter. For example, if a dashboard is installed in a motor vehicle, the platform is raised to approximately knee height so that installation can be carried out standing up. If work is carried out in the roof area of the vehicle, it is lowered further; If work is carried out on the axles, the platform is raised further with the vehicle.

When working on larger vehicles, such as those that are man-sized or even larger, it is not possible to comfortably work on the roof even if the vehicle has been lowered to the ground. An increase may need to be used here in order to make the working situation comfortable for the fitter or to make the work possible in the first place. When further work is carried out on the vehicle, these aids then become a nuisance again.

THE INVENTION

The object of the invention is now to propose a lifting table arrangement that simplifies working on such large objects.

The task is solved by a lifting table arrangement with the features of claim 1. The features of the dependent claims relate to advantageous embodiments.

According to the invention, the lifting table arrangement comprises a base frame and a first scissor lifting table arranged thereon and at least one second scissor lifting table, each scissor lifting table comprising scissors that can be pivoted relative to one another via a central bearing, which are coupled via corresponding fixed bearings to the base frame on the one hand and to an upper frame of the respective scissor lifting table are. The scissor lifting tables can be moved from a retracted position into an extended position via at least one drive. According to the invention, the lifting table arrangement is set up in such a way that the at least one second scissor lifting table moves between the retracted and the extended position when the first scissor lifting table moves at least in sections. The lifting table arrangement has at least two lifting tables, with a main lifting table, which carries the work object, for example, controlling the movement of the other scissor lift tables. With the lifting tables coupled in this way, the movements of individual lifting tables can be coordinated with one another and can be controlled with an operating device. A second control is no longer necessary, which also reduces the possibility of operating errors.

In a preferred embodiment, the lifting table arrangement is designed so that the movement of the first and at least one second scissor lifting table, in particular via a traction means, preferably a cable pull, or traction-pushing means, preferably a push rod, is mechanically coupled or associated by synchronization Drives are coordinated with each other. The coupling between the first lifting table and the at least one second lifting table can be done classically, i.e. mechanically, using a traction device or a traction-pushing device. Alternatively, the drive of the second lifting table(s) can also be controlled electronically by the drive and the movement of the first lifting table.

In a particularly preferred embodiment, an at least partial movement of the first scissor lifting table in a direction between the extended position and the retracted position causes an at least partial movement of the at least one second scissor lifting table in the same or the opposite direction. For example, it is possible to arrange additional scissor lift tables in such a way that the platform is in the rest position on the level on which the fitter or fitters are moving. When the main lifting table is then lowered below a predefined height, the lifting tables are raised so that a fitter can also work well in the upper area of the object to be processed. It is also possible to lower the lifting tables that are in the rest position on the level on which the fitters are moving so that the object that is on the platform of the main lifting table is below the level , on which the fitters are located, can be lowered. By coupling the lifting tables in this way, the control of the first lifting table is sufficient to achieve the best working position.

It has proven to be advantageous if an accessible storage area is arranged on the base frame of the lifting table arrangement. Such an accessible storage area does not have to be located directly on the floor on which the lifting table stands. This means that the accessible parking space can be set up above annoying obstacles. In addition, for a possible arrangement of the at least one second lifting table, it becomes easier to arrange its platform in the plane of the accessible storage area without having to accept tripping edges or obstacles.

It has proven particularly advantageous that the upper frame of the at least one second scissor lift table, in particular the upper surface of the upper frame, is sunk into the base frame in the retracted position of the at least one second scissor lift table in such a way that the upper - the frame springs back relative to the footprint in the direction of gravity. This makes it possible to edit what is to be processed Lower the object at least partially below the accessible level in order to be able to work better in the upper area of the object. The lifting table arrangement advantageously has a plurality of second scissor lifting tables. Thus, second lifting tables can be arranged at different points around the first lifting table, which, coupled to the first lifting table, move synchronously or carry out various movements that are adapted to the respective work situation. It has proven to be particularly advantageous that the lifting table arrangement comprises four second scissor lifting tables, between which the first scissor lifting table is arranged. Particularly in automobile construction, second lifting tables can be arranged where the wheels are mounted on the automobile, which also lower when the first lifting table is lowered after the lifting height has fallen below a certain level, thus releasing a space in which the wheels can be moved below the accessible parking space can be lowered in order to be able to work better in the upper area of the vehicle.

It has proven to be particularly advantageous if the lifting table arrangement is designed as a push skid. On such a lifting table arrangement, the object to be manufactured can be moved through the production line on the first lifting table without the object to be manufactured having to be lifted off the lifting table for further transport after the completion of a production step. The object to be manufactured can remain on the lifting table arrangement while the production section is running through. In a further preferred embodiment, the scissor lift tables have floating bearings. One of the floating bearings of the at least one second lifting table is not arranged at the end on the scissors, but between a fixed bearing and the central bearing of the legs. This floating bearing is also called a coupling bearing. According to the invention, at least one pair of scissors, in particular their coupling bearing, of the at least one second scissor lifting table is mechanically coupled to at least one pair of scissors, in particular their floating bearing, of the first scissor lifting table. With the mechanical coupling of the two lifting tables, the second lifting table can be positively guided. In a particularly preferred embodiment, the coupling bearing of the at least one second scissor lifting table is guided in or on a control section coupled to the first scissor lifting table. With the movement of the first scissor lifting table, the control section is moved, which in turn guides the second scissor lifting table via the coupling bearing. This means that the movements of the two scissor lift tables do not have to be uniform, but can be different. It has proven to be particularly advantageous that the control section is a link or control curve. A link or a control cam helps with the positive guidance of the at least one second lifting table.

BRIEF DESCRIPTION OF DRAWINGS

The subject matter of the invention will be explained in more detail below using exemplary embodiments. Figure 1 shows a perspective view of a lifting table arrangement according to the invention,

Figure 2 - shows the lifting table arrangement of Figure 1 in a different working position,

Figure 3 shows a perspective view of another lifting table arrangement cut lengthways in an almost extended position,

Figure 4 shows the lifting table arrangement of Figure 3 in a middle position,

Figure 5 shows the lifting table arrangement of Figure 3 in a retracted position,

Figure 6 shows the sectional view of another lifting table arrangement in an almost extended position,

Figure 7 shows the lifting table arrangement of Figure 6 in a middle position,

Figure 8 - shows the lifting table arrangement of Figure 6 in a retracted position.

BEST WAY TO CARRY OUT THE INVENTION

1 shows a lifting table arrangement 1 according to the invention, which comprises a base frame 19, 29 and a centrally arranged first scissor lifting table 10 and four second scissor lifting tables 20. On the base frame 19, 29, an accessible storage area 2 is arranged so that the upper frame 21 of the four second scissor lift tables 20 form a level with the accessible footprint 2. At this level, fitters can work on an object that is placed on the first scissor lift table 10 without the second scissor lift tables 20 forming an obstacle and thus a possible tripping point. In In the situation shown, the upper frame 11 of the first scissor lift table 10 is also at the height of the accessible footprint 2. The mechanics of the scissor lift tables 10, 21, which will be discussed in more detail below, and the drive 7 are located below the accessible footprint 2 and are therefore disruptive a fitter when processing an object that is located on the first scissor lift table 10.

If such a lifting table arrangement 1 is used, for example, for the assembly of a larger motor vehicle, it may happen that a fitter who is on the accessible parking space 2 cannot work well in the upper area of the motor vehicle because the assembly point is not ergonomically favorable, namely is too high, even though the upper frame 11 is located in the level of the accessible storage area 2 and cannot be lowered further, since, for example, the axles with the tire holders are already mounted and the tire holders touch the upper frames 21 of the second scissor lift tables 20 . The four second scissor lifting tables 20 are coupled to the first scissor lifting table 10 in such a way that if the lifting height falls below a predetermined height, the four second scissor lifting tables 20 are lowered, as shown in FIG. 2. In the example described, the tire holders can now be immersed in the accessible parking space 2 when the motor vehicle is lowered further with the first scissor lift table 10. This means that even a higher assembly point can be moved into an ergonomically favorable position for the fitter. After completing the corresponding assembly, the vehicle can be used with the The first scissor lift table 10 is raised, with the second scissor lift tables 20 also being raised again and again forming a level with the accessible storage area 2.

Figures 3 to 5 show, in perspective, a further lifting table arrangement 1 cut through lengthways in various positions.

Fig. 3 shows on the left side a base frame 19 on which a scissor lifting table 10 is arranged. The section through the lifting table arrangement 1 takes place in the longitudinal direction, namely from the right rear to the left front, so that only the rear half of the lifting table arrangement 1 is shown. The upper frame 11 of the first scissor lifting table 10 is arranged on the scissors 12, 13 via a fixed bearing 15 and a floating bearing 17. The legs 12, 13 are connected to one another via a central bearing 14 and thus form the scissors 12, 13, which are connected to the base frame 19 via a fixed bearing 16 and a floating bearing 18. The first scissor lift table 10 is in the upper end position or at least close to the upper end position. The drive of the first scissor lift table is indicated by the motor 7, without any further detailed design. This configuration is arbitrary; it can be a belt drive in which the axle 8 is pulled between the lower floating bearings 18 to lift the upper frame 11 in the direction of the motor 7; it can also be a spindle drive or another drive known to those skilled in the art. To the right of the base frame 19 there is a further base frame 29, on which a second scissor lifting table 20 is arranged; Here too, only the rear half of the second scissor lift table 20 is shown. The scissors 22, 23, whose legs 22 and 23 are connected via the central bearing 24, are arranged with the fixed bearing 26 and the floating bearing 28 on the base frame 29, and the scissors 22, 23 are connected via the fixed bearing 25 and the floating bearing 27 connected to the upper frame 21. The two scissor lifting tables 10, 20 are coupled by a coupling element 3, which is arranged on the connecting axis 8 of the two lower floating bearings 18 of the first scissor lifting table 10 and extends largely horizontally into the area under the upper frame 21 of the second scissor lifting table 20. There, the coupling element 3 is provided with a control section 4, which in the exemplary embodiment shown is designed in the form of a simple link; The control section 4 is composed of a control section 4a which thickens the coupling element 3 upwards and then a control section 4b which continues the thickening of the coupling element 3. The top of the coupling element 3 runs at a height starting from the left, in the control section 4a the surface shows a rising ramp, in the control section 4b the surface runs horizontally again. On this surface there is a floating bearing, also called a coupling bearing 23a, which is guided in an axis which is arranged on the leg 23 of the scissors 22, 23. The arrangement point of the axle on the leg 23 lies between the fixed bearing 26 and the central bearing 24. This lifting table arrangement 1 is shown with the first scissor lifting table 10 in the extended or almost extended state. The coupling element 3 is positioned so that the coupling bearing 23a comes to rest on the raised control section 4b and so the second scissor lifting table 20 is also in the extended position . If the first scissor lifting table 10 is now lowered, whereby the floating bearing 18 moves in the direction P, the coupling element 3 with the control section 4 also moves in the direction P. At the beginning of the downward movement of the upper frame 11 of the first scissor lifting table 10, the height of the second scissor lift table 20 is not changed since the coupling bearing 23a moves along the surface of the horizontal control section 4b.

Only when the coupling bearing 23a moves in the control area 4a, as shown in FIG is slowly moved downwards by the slope of the control section 4a and thus lowers the leg 23 of the scissors 22, 23.

When the coupling element 3 has moved with its control section 4 under the coupling bearing 23a, so that the coupling bearing 23a leaves or has left the control section 4a, as shown in FIG. 5, the second scissor lift table 20 has reached its lower position, because when the first scissor lifting table 10 is lowered further, the coupling bearing 23a moves again on a horizontal right surface of the coupling element 3 and does not change its height.

Figures 6 to 8 show the sectional view of another lifting table arrangement in different positions. The reference numbers are identical and do not all have to be explained again. In this exemplary embodiment, an accessible storage area 2 is arranged at height hs.

6 shows the first scissor lift table 10 in the extended or almost extended position. The second scissor lift table 20 is also extended, so that the upper side hτ of the upper frame 21 of the second scissor lift table 20 is at the height hs of the accessible storage area 2 and thus forms a flat surface with it. If the first scissor lifting table is now lowered, with the floating bearing 18 moving to the right in the figure, the coupling element 3 with its control section 4 is also moved to the right. As long as the coupling bearing 23a moves on the horizontal control section 4b, the second scissor lifting table 20 remains stationary. The accessible footprint 2 still forms a plane hs = hτ with the upper frame 21 of the second scissor lift table 20.

Fig. 7 shows this lifting table arrangement 1, in which the first scissor lifting table 10 has lowered itself so far that the coupling element 3 has moved so far below the second scissor lifting table 20 that the coupling bearing 23a has reached the sloping control section 4a. The coupling bearing 23a lowers as the upper frame is lowered further 11 of the first scissor lifting table 10 also lowers, so that the surface hi of the upper frame 21 of the second scissor lifting table 20 also lowers and so a depression is created in the plane of the accessible storage area 2.

If the coupling bearing 23a leaves the control area 4a during further lowering of the first scissor lifting table 10, as shown in FIG , is horizontal and so the height of the coupling bearing 23a does not change with further movement of the first scissor lift table 10. Thus, an object that is located on the upper frame 11 of the first scissor lift table 10 and extends beyond the upper frame 11 can be lowered below the accessible storage area 2 without the need for permanent openings for the object to be immersed in the accessible storage area 2 The accessible storage area 2 must be present, because these openings would represent danger points for fitters if the object were positioned far above the accessible storage area 2.

If the first scissor lift table 10 is raised again, which corresponds to a consideration of the figures from 8 to 7 to 6, the floating bearing 18 of the first scissor lift table 10 is pulled to the left (in the figure) and pulls the coupling element 3 arranged on the control axis 8 under the second scissor lift table 20 also to the left. The coupling bearing 23a remains in position because the upper surface of the coupling element 3 is arranged horizontally. Will that Control section 4a with the inclined surface is pulled under the coupling bearing 23a, the coupling bearing 23a is raised and thus the second lifting table as well, until the upper frame 21 forms a level again with the accessible footprint 2. Now the flat control section 4b is pulled along under the coupling bearing 23a and no longer changes the height of the second scissor lifting table 20 as the upper frame 11 of the first scissor lifting table 10 is raised further.

The examples shown in the figures show similar movements of the first and second scissor lifting tables 10, 20. However, it is also possible for the movements to be in opposite directions, for example when the first scissor lifting table 10 is lowered, the second scissor lifting table 20 is raised. It is also possible to initiate a more complex movement of the second scissor lift table 20 by designing the control section 4. It is also possible to use the coupling element 3 to move a control disk with which the coupling bearing is raised or lowered.

It is also possible to carry out the coupling between the first scissor lifting table 10 and the at least one second scissor lifting table 20 not mechanically, but electrically or electronically. The application of an inventive lifting table arrangement 1 is also not limited to a specific branch of industry, because motor vehicle assembly is mentioned in the examples. An inventive lifting table arrangement 1 can be used anywhere where a coupling a first scissor lift table 10 with at least a second scissor lift table 20 makes sense.

Claims

PATENT CLAIMS:

1. Lifting table arrangement (1), comprising a base frame (19, 29) and a first scissor lifting table (10) arranged thereon and at least one second scissor lifting table (20), each scissor lifting table having scissors (12) which can be pivoted relative to one another about a central bearing (14, 24). 13; 22, 23), which are coupled via corresponding fixed bearings (16, 15; 26, 25) and with the base frame (19, 29) on the one hand and an upper frame (11, 21) of the respective scissor lifting table (10, 20). are, wherein the scissor lifting tables (10, 20) can be moved from a retracted position into an extended position via at least one drive (7), characterized in that the lifting table arrangement is set up so that the at least one second scissor lifting table (20) when the first scissor lifting table (10) moves at least in sections between the retracted and the extended position.

2. Lifting table arrangement (1) according to claim 1, characterized in that the movement of the first and at least one second scissor lifting table (10, 20), in particular via a traction means, preferably a cable pull, or pull-push means, preferably a push rod, are mechanically coupled or coordinated by synchronizing associated drives.

3. Lifting table arrangement (1) according to one of the preceding claims, characterized in that an at least sectional movement of the first scissor lifting table (10, 20) in a direction between the extended position and the retracted position results in an at least sectional movement of the at least one second scissor lift table (20) in the same or opposite direction.

4. Lifting table arrangement (1) according to one of the preceding claims, characterized in that an accessible storage area (2) is arranged on the base frame (19, 29).

5. Lifting table arrangement (1) according to claim 4, characterized in that the upper frame (11) of the at least one second scissor lifting table, in particular the upper surface of the upper frame (11), in the retracted position of the at least one second scissor lifting table (11) in the base frame (19, 29) is sunk in such a way that the upper frame (11) springs back in the direction of gravity relative to the footprint (2).

6. Lifting table arrangement (1) according to one of the preceding claims, characterized in that it has a plurality of second scissor lifting tables (10).

7. Lifting table arrangement (1) according to claim 6, characterized in that it comprises four second scissor lifting tables (20), between which the first scissor lifting table (10) is arranged.

8. Lifting table arrangement (1) according to one of the preceding claims, characterized in that it is designed as a push skid.

9. Lifting table arrangement (1) according to one of the preceding claims, characterized in that the scissor lifting tables (10, 20) have floating bearings (17, 18; 27, 28, 23a), one of which has a coupling bearing (23a), wherein at least one scissor (23), in particular its coupling bearing (23a), of at least one second scissor lifting table (20) is mechanically coupled to at least one scissor (12), in particular its floating bearing (18), of the first scissor lifting table (10). is.

10. Lifting table arrangement (1) according to claim 9, characterized in that the coupling bearing (23a) of the at least one second scissor lifting table (20) is guided in or on a control section (4, 4a, 4b) coupled to the first scissor lifting table (10).

11. Lifting table arrangement (1) according to claim 10, characterized in that the control section is a link or control cam.