EP2731902B1 - Scissors lift and method for constructing a scissors lift - Google Patents

Description

TECHNICAL AREA

The invention relates to a method for assembling a scissor lift.

STATE OF THE ART

Scissor lift tables of the type in question have an upper and a lower frame module, which are connected by a pair of scissors such that a lifting movement is made possible by which the distance between the upper and lower frame module changes. To enable the execution of the movement, the scissor lift tables continue to have a drive unit.

As a rule, the pair of scissors consists of two pairs of crossed scissor blades, which are connected to each other in pairs by a center bearing and are spaced from each other by spaced apart in the width direction of the scissor lift struts. In this case, the struts running in the width direction connect the inner and the outer scissor blades with each other.

The respective inner or outer scissor blades are articulated to one of the frame modules in the region of the ends of the scissor blades. The hinged to a frame module ends of the scissor blades opposite ends of the respective scissor blades run on a running or wear rail or / or. in a guide in the respective other frame module in its longitudinal direction (the length direction of the lifting table), so that a relative rotational or pivotal movement of the inner scissor blades relative to the outer scissor blades can lead to a spreading of the scissors, by the interaction of their articulation on the frame modules with the possibility of sliding or rolling in the guides in the longitudinal direction results in a change in the distance of the frame modules, wherein the frame modules maintain their parallel alignment with each other, ie the desired stroke movement is generated.

Such scissor lift tables are used, for example, in production lines for the controlled lifting of loads, for example in motor vehicle production, ergonomic workplace design, level bridging, load lifts and the like.

According to the state of the art, such scissor lift tables are produced in individual production according to customer requirements. The reason for this is that the scissor lift in its typical uses, esp. For example, as part of a production line, accurate customer specifications in order to fit into the respective production line or production process. As a rule, other factors in the design of the production line have priority over the dimensions of available lifting tables, ie the lifting table must be adapted to the production line or the process and not vice versa.

This means that the main elements of such a lifting table, esp. The upper and lower frame module - also called upper and lower frame - and the scissors, must be individually dimensioned and made, which is associated with high costs, especially with long delivery times.

US 2009/278098 A discloses a method of assembling a scissor lift table according to the preamble of claim 1.

THE INVENTION

The invention is therefore based on the object of specifying a method for assembling a scissor lift, which allow the construction cost-effective Scherenhubtische according to individual customer specifications, in particular, a significant reduction of the production time and thus the delivery times to be achieved.

The object is achieved by a method for the assembly of a scissor lift with the features of claim 1.

The dependent claims relate to advantageous embodiments.

According to the invention the object is achieved in that the scissor lift in fixed sizes prefabricated and assembled in the manner of a modular system parts. Advantageously, this includes the selection of parts that are prefabricated in fixed sizes, in particular the scissor blades and prefabricated frame base modules that form the part of the frame modules to be connected by linkages and guides with the scissors. It is particularly advantageous if the frame base modules are usable for both the upper and lower frame modules, i. identical frame base modules can be used for upper and lower frame module.

So far, it was assumed that due to the large number of different customer specifications, the stocking of fixed sizes prefabricated parts for such lifting tables not worth it because a too large number of different sized components must be stored, resulting on the one hand the high cost of investment as an investment for vorzufertigenden parts on the other hand also a high storage space requirement and the associated costs brings with it. However, careful analysis of the specifications of scissor lift tables provided in the past has surprisingly shown that it is basically possible to meet the majority of practical customer specifications with scissor lift tables that can be assembled from a relatively manageable number of prefabricated parts.

The method according to the invention for assembling a scissor lift table therefore provides that the parts to be used for the assembly are selected from a series of different preset sizes and / or designs of prefabricated parts depending on the specification of the scissor lift to be assembled together, and the scissor lift is assembled from these parts becomes. As a result, all manufacturing steps, apart from the final assembly or the possibly necessary production of special parts necessary in individual cases, can be relocated to prefabrication. In the prefabrication, a series production instead of a one-off production is possible, which can be made significantly cheaper. Due to the fact that after commissioning by the customer only the final assembly or assembly of the scissor lift must be made of prefabricated parts, the viable delivery times shorten significantly.

Further advantages are achieved in the field of maintenance and spare parts supply, since parts do not have to be made first, but can be removed from the warehouse and by the basic principle always the same or at least similar structure of the lifting tables troubleshooting and any necessary instruction simplified by fitters, which is particularly advantageous if the location of a scissor lift to be maintained or repaired is located at a great distance from the manufacturer and so in comparison to the arrival case economically favorable instruction facilitated by a technician on site or even made possible in the first place. Also, for customers who often use several different lift tables, the spare parts quantity can be greatly reduced, which in turn reduces costs.

The feasibility of the invention is favored by a series of constructive measures regarding. The scissor lift in an advantageous manner. Thus, the frame base modules advantageously in the region of their end faces on fasteners, this may be flanges for screwing. In addition to the screwing principle, other connection techniques are possible, such as welding, gluing, hanging and the like.

Extension modules are attached to these fasteners such that the extension modules form part of the frame module as an extension of the frame base modules. This use of extension modules enables the rapid delivery of frame modules in a variety of lengths. In this case, a plurality of extension modules can be mounted one behind the other on the same front side of a frame base module, for example, to realize by the composition of extension modules of different lengths as large a variety of lengths to be produced frame modules with a limited number of vorzufertigenden extension modules in different lengths.

Advantageously, the scissor lift on a drive module on which the drive unit, ie the actual drive, i. a motor, a winding shaft, a hydraulic drive, a spindle drive or the like, is received, wherein the drive module also forms an extension of the frame base module forms part of the frame module. The drive element is advantageously fastened to the lower frame base module. In this way it is possible to realize a plurality of different scissor lift tables by providing different versions of drive modules, which are equipped, for example, with different types of drive units, by a frame base module depending on the specifications which relate to the characteristics of the frame base module, thus in particular width Hub, with a drive module, which is equipped with a drive unit corresponding to the customer specifications, is combined.

When assembling the scissors, it is also possible to optimize the use of identical parts in an advantageous manner if identical scissor blades are used as the inner and outer scissor blades for the construction of the respective right or left scissor package. This makes it possible to hold prefabricated inner and outer scissor blades in fixed sizes or designs. The selected from the holding scissors blades inner and outer scissor blades are then joined together by a center bearing, which is characterized by the arrangement the scissor blades when connecting to the center bearing results in the relative position of the inner scissor blade and the outer scissor blade to each other and so the use of the resulting scissors package is set as the left or right scissors package of the scissors of the lifting table. The two sets of scissors are then assembled to form scissors by struts in the width direction, the struts in the width direction predetermining the width of the scissors, which depends on the width of the desired together to be built lifting table. Again, can be realized with relatively few identical parts by combining different struts in the width direction for different widths and different scissor blades, in particular for the realization of different strokes, a variety of Hubtischvarianten. The compounds of the struts in the width direction with the scissor blades can be advantageously realized by screwing, which can be mounted in a short time and in maintenance or replacement also again solvable, but also in a conventional manner by welded joints. The center bearings are advantageously also fixed by screwing in the scissor blades.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

Figur 1 -

eine schematische Darstellung eines Ausschnittes eines beispielhaften erfindungsgemäßen Scherenhubtisches,

Figur 2 -

eine beispielhafte Schere für einen erfindungsgemäßen Scherenhubtisch,

Figur 3 -

ein beispielhaftes Scherenpaket für einen erfindungsgemäßen Scherenhubtisch.

The invention will be described below with reference to the FIGS. 1 to 3 schematically explained in more detail. Show it:

FIG. 1 -

a schematic representation of a section of an exemplary Scherenhubtisches invention,

FIG. 2 -

an exemplary scissors for a scissor lift according to the invention,

FIG. 3 -

an exemplary scissor package for a scissor lift according to the invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The exemplary scissor lift according to the invention comprises an upper frame module 1 and a lower frame module 2, which are connected by the scissors 3. A frame base module 5 is in each case a component of the upper frame module 1 and of the lower frame module 2. Further components of the upper frame module 1 and of the lower frame module 2 are extension modules 7 which are fastened to the end faces of the frame base modules 5. For this purpose, the frame base modules 5 and the extension modules 7 fastening elements 9, in the example shown in the form of flanges for screwing.

The drive unit 4 is accommodated on a drive module 6 which, like the extension modules 7, is connected by means of a fastening element 9 to a frame base module 5 on its end face.

In the exemplary embodiment shown, the scissors attachment parts 4a and 4b in the form of guides for a movable element 4c of the drive, which is moved by the drive unit 4 via a deflected belt 4d and thus causes the lifting movement.

The scissors 3 has two identical inner scissor blades 3a and 3b and two identical outer scissor blades 3c and 3d. In each case, an inner and an outer scissor blade are connected to form a scissors package by a center bearing 8. In these scissor packages formed from center bearing 8 and two scissor blades, the side of the lifting table on which the scissor assembly is to be used is determined by the connection of the scissor blades to the center bearing 8. This results in a right scissors package 3a, 3c and a left scissors package 3b, 3d, which are combined by struts in the width direction of the lifting table 10 to form a pair of scissors. In the example shown, the struts 10 are screwed to the scissor blades 3a, 3b, 3c and 3d. In addition to the struts 10, which serve only to ensure the structural stability of the scissors, and multifunctional struts 10a are possible, for example, as an additional function represent the abutment for a deflection of the drive of the lifting table. The scissor blades 3a, 3b, 3c and 3d further take elements 12 which serve to articulate and guide the scissors 3 on the frame base modules 5. These are designed so that they can be mounted on the two sides of the scissor blades, so that the reversibility of the respective inner or outer scissor blade as such, ie without mounted attachments guaranteed.

• Es werden sechs verschiedene Scheren, beispielsweise in zwei Breiten und drei verschiedenen Scherenblattlängen und dazu korrespondierende sechs verschiedene Größen Rahmenbasismodule 5 vorgefertigt. Weiterhin zehn Verlängerungsmodule in unterschiedlichen Größen sowie Antriebsmodule 6 in zwei Größen mit je drei unterschiedlichen Antriebseinheiten 4. Dazu werden zwei unterschiedliche Typen Scherenmittenlager bevorratet, beispielsweise eine Ausführung als DU-Buchse und eine als Gelenklager. Bereits mit diesen Teilen lassen sich ca. 450 verschiedene Scherenhubtische realisieren. Werden die Abmessungen und Ausführungen der Einzelteile auf der Grundlage der Erfahrungen aus in der Vergangenheit produzierten Hubtischen geschickt ausgewählt, so kann auf diese Weise mit einer geringen Anzahl an verschiedenen zu bevorratenden Teilen ein Großteil der in der Praxis nachgefragten Scherenhubtische, die sonst individuell nach Kundenwunsch hätten gefertigt werden müssen, auf kostengünstige Weise in kürzester Zeit bereitgestellt werden.

An exemplary method according to the invention for assembling a lifting table can now look as follows:

• There are six different scissors, for example, in two widths and three different scissor blade lengths and corresponding six different sizes Rahmenbasismodule 5 prefabricated. Furthermore, ten extension modules in different sizes and drive modules 6 in two sizes, each with three different drive units 4. For this purpose, two different types Scherenmittenlager be stored, for example, a design as a DU socket and a joint bearing. Already with these parts can be realized about 450 different scissor lift tables. If the dimensions and designs of the individual parts are cleverly selected on the basis of the experience gained from lifting tables produced in the past, then a large number of scissor lift tables which are otherwise in demand on a customer basis can be used in this way with a small number of different parts to be stocked must be made available in a cost effective manner in a very short time.

Claims (4)

1. Method for assembling a scissors lift table, comprising the following steps:

   - selecting the parts, which are to be used for the assembly, from a series of parts which are prefabricated in different predetermined fixed sizes and/or designs, dependent on the specification of the scissors lift table which is to be assembled;

   - assembling the scissors lift table from these parts, characterised by the steps:

   - selecting one or several extension module/s (7) which are to be used for the assembly, from a series of extension modules which are prefabricated in different predetermined fixed sizes

   - fastening the extension module or modules to an end side of a basic frame module.
2. Method according to claim 1 characterised by the step:

   - selecting the basic frame modules (5) and/or scissors leaves (3a, 3b, 3c, 3d), which are to be used for the assembly, from a series of basic frame modules (5) and/or scissors leaves (3a, 3b, 3c, 3d), which are prefabricated in different predetermined fixed sizes and/or designs, dependent on the specification of the scissors lift table which is to be assembled, more particularly of the lift which is to be achieved.
3. Method according to one of claims 1 and 2, characterised by the steps:

   - selecting a drive module (6), which is to be used for the assembly, from a series of drive modules (6) which are prefabricated in different predetermined fixed sizes and/or designs;

   - fastening the drive module (6) on the end of a basic frame module.
4. Method according to one of claims 1 to 3 characterised by the steps:

   - selecting each two identical inner scissor leaves (3a, 3b) and outer scissor leaves (3c, 3d), which are to be used for the assembly, from a series of scissor leaves (3a, 3b, 3c, 3d) which are prefabricated in different predetermined fixed sizes and/or designs;

   - connecting each one inner scissor leaf (3a, 3b) and outer scissor leaf (3c, 3d) to form one scissor unit by a central bearing (8), wherein the ability to use the scissor unit as a left or right scissors unit is fixed through the connection.

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