EP1772417B1 - Lifting table - Google Patents
Lifting table Download PDFInfo
- Publication number
- EP1772417B1 EP1772417B1 EP06017505A EP06017505A EP1772417B1 EP 1772417 B1 EP1772417 B1 EP 1772417B1 EP 06017505 A EP06017505 A EP 06017505A EP 06017505 A EP06017505 A EP 06017505A EP 1772417 B1 EP1772417 B1 EP 1772417B1
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- EP
- European Patent Office
- Prior art keywords
- platform according
- elevating platform
- profile
- profile element
- profile elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/0633—Mechanical arrangements not covered by the following subgroups
Definitions
- the invention relates to a lifting table for lifting and lowering heavy loads according to the preamble of patent claim 1.
- Lifting tables of this type are known in various designs in industrial conveying and manufacturing technology; they generally serve to move a load from one height level to another height level.
- lifting tables are used to introduce bodies into treatment stations and to remove them from them.
- the introduction can be done by lowering, for example, in a bath, and the removal by lifting, so escape from the bath.
- the introduction may also include a lifting movement, for example, when introduced into a dryer, and a lowering movement during deployment. Lifting movements are also often necessary when transferring from one conveyor to another.
- a lifting table of the type mentioned is for example from the DE 26 19 347 A1 known.
- the upper structure is connected via telescopic guides with the substructure; Shear-type levers transmit the force exerted by a hydraulic cylinder to lift the top structure.
- a jack is in the FR 2 770 835 A described which makes use of the elastic properties of deformable parts.
- Two bulbously shaped parts hingedly connected at their ends have at their end regions flexibly formed zones, which are connected to one another via a rigid zone.
- a motor-driven threaded spindle engages in a sleeve, which is arranged in one of the articulated ends. By rotation of the threaded spindle, the hinged ends can be moved towards each other, whereby the rigid zones move away from each other, so that the jack performs a lifting operation.
- the ability to absorb tilting moments is limited.
- Object of the present invention is to make a lifting table of the type mentioned so that the force is generally under more favorable geometric conditions and the costs are lower.
- the invention makes use of the fact that elastically deformable profile elements, which have a suitable initial shape, are deformed by application of a lateral force such that their perpendicular to the direction of the force Dimension is increased. Taking away the external force, the profile element returns elastically to its original shape.
- Such elastically deformable profile elements can be comparatively inexpensive, for example made of fiber-reinforced plastic but also of metal, especially steel.
- the horizontal driving forces are - as in the prior art in the above-mentioned jack known - when using the profile elements according to the invention cheaper in the vertical movement of the upper structure to, as is the case with the known scissor or Exzenterhubtician.
- at least two profile elements are arranged side by side to increase the carrying capacity of the lifting table. In this way, relatively flat but large lift tables can be achieved.
- the hub according to the invention lifting tables is - compared with scissor lift tables - from home not too big.
- this disadvantage can readily be accepted in many applications, especially since there are measures that can lead to an increase in the stroke and are explained in detail below.
- the power source may comprise a motor and a horizontally extending threaded spindle driven by the latter and a threaded nut which can be screwed onto the threaded spindle and which is in frictional connection with a lateral region of a profile element.
- This type of power source is used where forces are to be exerted on the lateral region of the profile element in both directions, that is, tensile and compressive forces.
- the power source may comprise a motor and a drum driven by this, on which one with a lateral region a flexible element connected to a profile element, for example a cable, can be wound, which runs horizontally at least in the region adjacent to the profile element.
- the drive via a flexible traction means is even more cost-effective, space-saving and variable than that via a threaded spindle.
- the flexible traction means for multiplying the force can also be guided flaschenzugartig.
- the force which serves to elastically deform the profile elements is introduced on one side on a lateral region of a profile element.
- this unilateral nature of the introduction of force has the consequence that the upper structure simultaneously moves to a certain extent horizontally during its vertical movement. This is easily acceptable in many cases.
- a horizontal movement of the upper structure occurring simultaneously with the vertical movement can be avoided by virtue of the fact that the force can be introduced on two opposite lateral areas of the same profile element or different profile elements.
- the vertical movement of the upper structure relative to the substructure is associated with a relative movement between the connection structure and the upper structure and between the connection structure and the substructure, at least in certain areas. So where this relative movement takes place, the choice of materials should be made so that only a slight friction occurs.
- Adjacent profile elements can abut each other directly with lateral areas. This design is chosen when a maximum surface load is to be achieved for a given area of the top structure.
- adjacent profile elements may have a lateral distance from each other.
- adjacent profile elements may be connected to each other by at least one force-transmitting spacer.
- At least one area of at least one profile element is preferably immovably connected to the substructure and / or the upper structure.
- Such a type of connection can serve to define the position of the connection structure between the substructure and the upper structure, ie to ensure that the entire connection structure does not shift during a lateral application of force.
- An immovable attachment of a lateral region of a profile element can also make sense where several profile elements are used side by side, but not adjacent to each other and are not connected to one another via a separate force transmitting spacer.
- the reaction force on the lateral, deforming force is introduced in this case via the non-displaceable edge region of the profile element in the upper or substructure.
- the stroke which can be achieved with a lifting table according to the invention, can be increased by arranging at least two profile elements one above the other. In this case, add the strokes that are achievable with each of the superposed profile elements.
- the superimposed profile elements can be arranged either in the same direction or in opposite directions.
- the term "in the same direction” is understood to mean the same orientation of the two profile elements in space, while in an opposing arrangement, one of the profile elements is rotated through 180 ° so that its upper side becomes the lower side.
- the lift table may be composed of two superimposed sub-lift tables, each of which has a sub-structure, a connection structure and a top structure.
- This embodiment of the invention allows a modular assembly of a lifting table depending on the desired stroke size of a plurality of identically constructed Unterhubtica, which are basically all functional on their own. It is possible that all "Schhubtician” are operated synchronously in the "total lift" by one and the same power source; Alternatively, it is also conceivable that different Unterhubtician be operated separately from each other by separate power sources.
- At least one profile element at an upper or lower vertex area, with which it bears against the substructure or on the upper structure or on the vertex area of another profile element is provided with a rib-like projection which forms a flat bearing surface.
- the rib-like projection can also be a separate, subsequently connected to the profile element part, which consists of a low-friction plastic.
- At least two profile elements may be provided at their lateral, abutting areas with a rib-like projection which forms a planar contact surface.
- At least one profile element is open on one side.
- “unilaterally open” is meant here a profile shape having free edges on the bottom or top.
- Examples of such “unilaterally open” profile elements are those which have the shape of a circular cylinder partial circumferential surface own or roof-shaped.
- connection structure relatively small, modular components composable components can be used. In individual cases, however, it may be cheaper if at least two profile elements are integrally connected to each other. This design principle can be carried so far that eventually the entire connection structure is integral.
- the at least one profile element can also be designed like a tube. To lift the upper structure of this hose-like profile element is effectively "squeezed" in the horizontal direction.
- Tubular profile elements used in the present invention may be open at opposite ends. This makes it possible that the air trapped in the interior of the profile element escapes during the deformation of the profile element and in this way has no influence on the Verforlnungseigenschaften of the profile element.
- the tubular profile element is closed all around.
- the included in the profile element Air is thus trapped, so that it must be compressed, for example, at a caused by the deformation volume reduction. It contributes in this way to the deformation characteristics of the profile element and can, for example, affect the load capacity of the entire lifting table.
- the effect exerted on the deformation characteristic by the trapped air volume can be changed in one embodiment of the invention by adjusting the pressure of the gas trapped in the profile element.
- the profile element contains at least a variation of its wall thickness. Relatively thin areas of the wall of the profiled element are easier to deform than adjacent, thicker areas.
- One possible application of this principle is to introduce so-called "thin-layer hinges" around which two adjacent regions of the profile element can perform a type of rotary movement.
- a lifting table is shown in a schematic manner, which is generally designated by the reference numeral 1 and is intended primarily for lifting and lowering heavy loads with a small stroke.
- this lifting table 1 also comprises a substructure 2 which can be fastened to a floor or another supporting structure, a load-bearing upper structure 3 and a connecting structure 4 arranged between the substructure 2 and the upper structure 3.
- the substructure 2 has in the illustrated embodiment, two parallel C-beams 2a, 2b, while the upper structure 3 as a flat support plate with double-folded longitudinal edges 3a, 3b is configured.
- connection structure 4 in turn comprises three shell-shaped profile elements 5, which in the in FIG. 1b illustrated, relaxed state represent the shape of rectangular sections of a circular cylindrical surface with relatively large radius.
- the axes belonging to the cylinder jacket surfaces run perpendicular to the extension direction of the two parallel profile carriers 2a, 2b.
- the axially parallel edges of the profile elements 5 are each secured in a manner which will be described below with reference to FIG 2, in a bar 8, which is guided with its opposite ends respectively in the two profile beams 2a, 2b slidably. If it is to be prevented that the overall arrangement of the profile elements 5 and the strips 8 can move along the profile beams 2a and 2b, one or two adjacent strips 8 can also be fixed to the profile rails 2a, 2b. In the following, it is assumed that the in FIG. 1b the leftmost strip 8 attached to the profile beams 2a, 2b, for example, is screwed.
- a respective rib-shaped projection 14 is integrally formed with a flat bearing surface. If the upper structure 3 is simply placed on the support surfaces of the projections 14, this results in the FIG. 1a illustrated, compact image of the lifting table 1.
- the profile elements 5 are made of elastic material, for example made of sheet steel, but preferably made of fiber-reinforced plastic. Will the indicated by the arrow 25 in FIG. 1b taken away shown force, therefore relax the profile elements 5 again and are under displacement of the movable strips 8 and the upper structure 3 in the in the FIGS. 1a and 1b shown position returned.
- the elastic forces acting in the profile elements 5 cooperate with the weight forces resulting from the load and the upper structure 3 itself.
- the contact surfaces of the rib-like projections 14 between the retracted position of the lifting table 1 after the FIGS. 1a and 1b and the extended position after the FIGS. 1c and 1d not all move laterally (horizontally) to the same extent, it is ensured by use of suitable materials or other measures that the contact surfaces of the rib-like projections 14 can slide smoothly along the underside of the upper structure 3 along.
- the least moving projection 14 can be fixed to the upper structure 3.
- FIG. 2 shows how two adjacent Profile elements 5 - , 5 'with their adjacent longitudinal edges on two strips 8, 8' are fixed.
- Each profile element 5, 5 ' has for this purpose at its longitudinal edges in cross-section annular fixing ribs 17, 17', which in cross-sectionally semicircular grooves 19, 19 'of the two strips 8, 8' are inserted.
- the fastening ribs 17, 17' rotate like an angel in the associated grooves 19, 19 'of the strips 8, 8'. In this way, excessive local deformations and forces in the region of the edges of the profile elements 5 are avoided.
- the advantage of this type of force introduction is that the upper structure 3 does not move substantially parallel to the profile carriers 2a, 2b (lateral); it can then even be attached to the rib-like projection 14 of the central profile element 5. Here, in this case, no relative movement takes place between the upper structure 3 and the profile element 5.
- the number of profile elements 5, which is used in a particular lifting table 1 is not limited. In individual cases, a single lifting element 5 may be sufficient. In the case of large lifting tables 1, a large number of profile elements 5 can also be used.
- FIG. 3 an embodiment of a lifting table is shown, which is similar to that of the above with reference to FIGS. 1a to 1d has been described. Corresponding parts are therefore identified by the same reference numeral plus 100.
- a substructure 102 which is designed here as a plate, as well as an upper structure 103, which is likewise designed as a plate.
- the connecting structure 104 here comprises only two shell-shaped, downwardly open profile elements 105, whose longitudinal edges parallel to the axes of the circular cylinder lateral surfaces are each fastened in a strip 108.
- the attachment is done in the same manner as described above with reference to FIG 2.
- the strips 108 are, with one exception, which will be discussed below, slidably guided on the floor structure 102 in a manner not further explained perpendicular to its longitudinal extension.
- connection structure 104 of the embodiment of FIG. 3 two rigid spacers in the form of rods 121 which are inserted between the mutually facing inner strips 8 of the two profile elements 105.
- the leftmost bar 108 is again intended to be fixed.
- the two profile elements 105 similar to in FIG. 1 with reduction of the radius of curvature and by raising their crest lines and the superstructure 103 lying thereon.
- the extended position of the lifting table 101 is in the Figures 3c and 3d represented, which probably need no further explanation.
- lifting tables 1 and 101 can understandably only achieve a relatively small stroke. An increase in this stroke is possible because simply several such lifting tables 1 and 101 are superimposed and form in this way a new lifting table 201, as in the FIGS. 4a to 4d is shown.
- the lift table 201 consists in this case of two "Schhubtica" 101, 101 'of in FIG. 3 illustrated type, wherein the substructure of the upper lift table 101 is placed on the upper structure of the lower lift table 101 '.
- the two Unterhubtician 101, 101 ' can be operated either simultaneously from the same power source or by independent power sources.
- the maximum stroke of the lifting table 201 corresponds to the sum of the strokes of the individual sub-lift tables 101, 101 '.
- FIG. 5 Another type, two Unterhubtician 101, 101 'of in FIG. 3 to assemble a lifting table 301 is shown in FIG. 5 shown.
- the upper sub-lift table 101 in the in FIG. 3 is oriented in space, in which the "substructure” actually comes to lie down, while the lower Unterhubtisch 101 'is effectively upside down, so that its substructure above and in abutment against the substructure of the upper Unterhubticians 101 comes.
- the total stroke of the lift table 301 is equal to the sum of the strokes of the two sub-lift tables 101, 101 '.
- the sub-elevating tables 101, 101 ' can be actuated either synchronously or independently of each other by separate sources of force, either by a common power source.
- lifting table 401 are a plurality of elastically deformable profile elements 405, 405 'arranged in pairs to increase the total stroke one above the other.
- the lifting table 401 is not a complete multiplication of a "sub-lift table”. Rather, here are each in pairs abutting, designed as a part cylinder jacket surfaces profile elements 305, 305 'oppositely applied directly to each other, such that each of the lower profile element 405' downwardly open and the upper profile element 405 is open at the top.
- this construction is such that by applying force to the actuating plates 422, 423, the outer longitudinal edges of the profile elements 405, 405 'are guided inwardly, thereby deforming the profile elements 405, 405' and their respective apex line a greater distance from the adjacent one Substructure 402 or upper structure 403 receives.
- connecting structure 504 consists of a plurality of tubular, parallel to each other and abutting arranged hose-like profile elements 505.
- Each of these profile elements 505 can be understood as integrally formed of two shell-shaped profile elements, such as she in the FIGS. 1 to 3 are shown.
- the elastic profile elements 505 In the "retracted" state of the lifting table 501, as he in the FIGS. 5a and 5b is shown, the elastic profile elements 505 have a substantially elliptical cross-section, wherein the longer major axis is arranged horizontally, ie parallel to the substructure 502 and the upper structure 503. Along the apex lines, which are assigned to the short ellipse axes, in turn extend rib-like projections 514, 514 ', on which in each case the substructure 502 and the upper structure 503 is applied.
- the tubular profile elements 505 it arises from the in the FIGS. 7a and 7b shown state of the from FIGS. 7c and 7d apparent condition.
- the tubular profile elements 505 again have an elliptical cross-section, after they have passed through an intermediate state in which the cross-section was approximately circular.
- the longer ellipse axis of the cross-section of the profile elements 505 is vertical and the shorter ellipse axis is horizontal.
- the end faces of the tubular profile elements 505 are open, so that the air trapped in its interior can escape during the deformation. in principle However, it is also possible to close these end faces, which has an influence on the "stiffness" and the carrying capacity of the profile elements 505. Possibly. it is also possible to make the pressure of the gas, for example the air, within the closed profile elements 505 adjustable. However, this adjustable pressure is not to be confused with the pressure, which serves for example for inflating a bellows-like lifting device. In the present invention, during the actual operation of the lift table, the trapped amount of gas is not changed by the supply or discharge of gas; the lifting movement takes place exclusively due to the deformation of the profile elements by a force acting in the lateral direction.
- the connecting structure 604 consists of a plurality of tubular, abutting elastic profile elements 605, which rest on its underside via a rib-like projection 614 'on the substructure 602 and at the top via a rib-like projection 614 on the upper structure 603.
- the cross-section of profile elements 605 is not strictly elliptical; Rather, it can be thought of as one piece composed of two shell-shaped, sub-cylinder jacket surfaces forming sub-elements, those of the FIGS. 1 and 2 correspond.
- This embodiment in turn has the advantage that when extending and retracting the lifting table 601 in the vicinity of the lateral apex lines of the profile elements 605 do not form high local deformations and thus stresses.
- FIG. 9 illustrated embodiment of a lifting table 701 is very similar to the one above with reference to FIGS. 1 to 2 has been described. It differs from the latter essentially only by the nature of the profile elements which form the connection structure 704. The differences are essentially as follows:
- the connecting structure 704 comprises only a single, one-piece profile part. This, in turn, consists of three sub-profiles 705 integrally connected to adjacent edges.
- the sub-profiles 705 have a substantially roof shape with two approximately flat legs, which form an angle at a "roof ridge". Since the lower joints between adjacent sub-profiles 705 have the same geometry as the above-mentioned "ridge" of the sub-profiles 705, the distinction in sub-profiles is somewhat arbitrary;
- the connection structure 704 can also be understood as a zigzag between the substructure 702 and the upper structure 703 extending profile element.
- the individual approximately flat legs of the connecting structure 704 are connected to each other via formed by grooves, acting like a hinge thin points.
- the legs of the connecting structure 704 remain substantially flat. It essentially changes only the angle enclosed by adjacent legs, which is greater in the "retracted" state of the lifting table 701 than in the extended state.
- FIG. 10 Realistnah shown how an inventive lifting table 801 can be used in practice as a sliding table.
- the lifting table 801 is similar in its basic construction very much to the embodiment of FIGS. 1 and 2. This means that the lift table 801 has a substructure 802 consisting of two parallel profile beams 202a and 202b (in Figs FIG. 10 only the front profile support 202a can be seen).
- the upper structure 803 supporting a connection structure 804 on the substructure 802 carries in FIG. 10 a roller conveyor 840, which in turn comprises a plurality of spaced rollers 841.
- the axes of rotation of the rollers 841 extend perpendicular to the plane of the FIG. 10 , Objects placed on the rollers 841 can therefore be locked by turning the rollers 841 in FIG FIG. 10 be moved to the left or right.
- the rollers 841 are driven by a geared motor 842 and various belts in a known manner.
- edges of the three shell-shaped elastic profile elements 805 running parallel to the axis of the partial cylinder jacket surface are "knotted” again in strips 808, as shown in FIG.
- leftmost ledge 808 is fixed while all other ledges 808 are parallel to themselves in FIG FIG. 10 are slidably guided along the profile support 802a.
- the electric motor 843 drives a threaded spindle 844, which extends parallel to the profile carriers 802a, 802b, between them, and is rotatably mounted at its free end in a bearing block 845.
- On this threaded spindle 844 runs a nut 846, with the in FIG. 10 the rightmost ledge 808 is connected.
- the entire lifting table 801 is between two parallel, perpendicular to the plane of the FIG. 10 extending roller strips 850 arranged.
- Each of these roller strips 850 comprises on its upper side a multiplicity of rollers 852 arranged at a distance from one another and drivable in a known manner.
- roller bars 850 and lift table 801 works as follows:
- the electric motor 843 is put into operation.
- the nut 848 in FIG. 10 moved to the left; the furthest to the right in FIG. 10 lying strip 808 is taken from the mother 848, so that the profile elements 805 are deformed in the manner described above with reference to FIGS. 1 and Fig. 2 has been explained.
- the upper structure 803 is raised until the rollers 841 abut against the underside of the object and, finally, during the further vertical movement of the upper structure 803 lift this object from the rollers 852 of the roller strips 850.
- the electric motor 842 can be energized in the desired direction, so that the rollers 841 the object in FIG. 10 transport to the right or left to another conveyor system or to a processing station.
- the various profile elements were integrally connected to the rib-like projections, which provide flat contact or bearing surfaces.
- the rib-like projection 914 used here is a separately manufactured part, which consists of low-friction plastic and was subsequently connected to the rest of the profile element 905.
- the choice of material for the profile element 105 can then be made exclusively in terms of elasticity, bending resistance and mechanical Stabiltreli.
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Description
Die Erfindung betrifft einen Hubtisch zum Heben und Senken schwerer Lasten nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a lifting table for lifting and lowering heavy loads according to the preamble of
Hubtische dieser Art sind in unterschiedlichster Ausgestaltung in der industriellen Förder- und Fertigungstechnik bekannt; sie dienen allgemein dazu, eine Last von einem Höhenniveau in ein anderes Höhenniveau zu bewegen. In der Fertigung von Fahrzeugen beispielsweise werden Hubtische dazu benutzt, Karosserien in Behandlungsstationen einzubringen und aus diesen wieder zu entnehmen. Das Einbringen kann durch Absenken, beispielsweise in ein Bad, und das Entnehmen durch Anheben, also Austauchen aus dem Bad erfolgen. Das Einbringen kann jedoch auch eine Hubbewegung beinhalten, beispielsweise beim Einbringen in einen Trockner, und eine Absenkbewegung beim Ausbringen. Hubbewegungen sind außerdem häufig bei der Übergabe von einem Förderer zum anderen notwendig.Lifting tables of this type are known in various designs in industrial conveying and manufacturing technology; they generally serve to move a load from one height level to another height level. In the manufacture of vehicles, for example, lifting tables are used to introduce bodies into treatment stations and to remove them from them. The introduction can be done by lowering, for example, in a bath, and the removal by lifting, so escape from the bath. However, the introduction may also include a lifting movement, for example, when introduced into a dryer, and a lowering movement during deployment. Lifting movements are also often necessary when transferring from one conveyor to another.
Am weitesten verbreitet sind derzeit solche Hubtische, die als Verbindungsstruktur Scherengitter verwenden. Im allgemeinen wird dabei zum Anheben der Oberstruktur ein unteres Ende eines Scherengliedes mit einer seitlichen Kraft beaufschlagt, so dass sich die Schere längt. Insbesondere im anfänglichen Teil des Hubes sind dabei die geometrischen Verhältnisse der Kraftanleitung sehr ungünstig, so dass hohe Kräfte benötigt werden; erst bei weiter angehobener Oberstruktur wird die Geometrie der Krafteinleitung günstiger. Nachteilig bei mit Scherengitter arbeitenden Hubtischen ist außerdem der verhältnismäßig hohe Preis. Die Oberstruktur ist bei Scherenhubtischen außerdem ein für die Stabilität des Gesamtkonstruktion unerlässliches Bauelement.At present, most widely used are lifting tables which use scissor lattices as connecting structure. In general, a lower end of a scissor member is subjected to a lateral force for lifting the upper structure, so that the scissors lengthen. In particular, in the initial part of the stroke while the geometric conditions of the power instructions are very unfavorable, so that high forces are required; only when the upper structure is further raised does the geometry of the force introduction become more favorable. A disadvantage of working with a sliding frame lifting tables is also the relatively high price. The upper structure of scissor lift tables is also an essential component for the stability of the overall construction.
Ein Hubtisch der eingangs genannten Art ist beispielsweise aus der
Für Hübe unter 300mm finden bisher auch Exzenterscheiben als Verbindungsstruktur Verwendung. Auch diese sind verhältnismäßig teuer.For strokes under 300mm find so far eccentric discs as a connection structure use. These too are relatively expensive.
Ein Wagenheber ist in der
Aufgabe der vorliegenden Erfindung ist es, einen Hubtisch der eingangs genannten Art so zu gestalten, dass die Krafteinleitung insgesamt unter günstigeren geometrischen Bedingungen erfolgt und die Kosten geringer sind.Object of the present invention is to make a lifting table of the type mentioned so that the force is generally under more favorable geometric conditions and the costs are lower.
Diese Aufgabe wird erfindungsgemäß durch eine Hubtisch mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a lifting table with the features of
Die Erfindung macht sich die Tatsache zunutze, dass elastisch verformbar Profilelemente, die eine geeignete Ausgangsgestalt besitzen, durch Beaufschlagung mit einer seitlichen Kraft so verformt werden, dass ihre senkrecht zur Kraftrichtung stehende Abmessung vergrößert wird. Nimmt man die äußere Kraft weg, so kehrt das Profilelement elastisch in seine Ausgangsform zurück. Derartige elastisch verformbare Profilelemente lassen sich vergleichsweise kostengünstig, beispielsweise aus faserverstärktem Kunststoff aber auch aus Metall, insbesondere Stahl, herstellen. Die horizontalen Antriebskräfte setzen sich - wie im Stand der Technik bei dem oben genannten Wagenheber bekannt - bei Verwendung der erfindungsgemäßen Profilelemente günstiger in die vertikale Bewegung der Oberstruktur um, als dies bei den bekannten Scheren- oder Exzenterhubtischen der Fall ist. Erfindungsgemäß sind zur Erhöhung der Tragkraft des Hubtisches mindestens zwei Profilelemente nebeneinander angeordnet. Auf diese Weise lassen sich verhältnismäßig flache jedoch großflächige Hubtische erzielen.The invention makes use of the fact that elastically deformable profile elements, which have a suitable initial shape, are deformed by application of a lateral force such that their perpendicular to the direction of the force Dimension is increased. Taking away the external force, the profile element returns elastically to its original shape. Such elastically deformable profile elements can be comparatively inexpensive, for example made of fiber-reinforced plastic but also of metal, especially steel. The horizontal driving forces are - as in the prior art in the above-mentioned jack known - when using the profile elements according to the invention cheaper in the vertical movement of the upper structure to, as is the case with the known scissor or Exzenterhubtischen. According to the invention, at least two profile elements are arranged side by side to increase the carrying capacity of the lifting table. In this way, relatively flat but large lift tables can be achieved.
Der Hub erfindungsgemäßer Hubtische ist allerdings -verglichen etwa mit Scherenhubtischen - von Hause aus nicht allzu groß. Dieser Nachteil kann aber in vielen Anwendungsfällen ohne weiteres in Kauf genommen werden, zumal es Maßnahmen gibt, die zu einer Vergrößerung des Hubes führen können und unten im Einzelnen erläutert werden.However, the hub according to the invention lifting tables is - compared with scissor lift tables - from home not too big. However, this disadvantage can readily be accepted in many applications, especially since there are measures that can lead to an increase in the stroke and are explained in detail below.
Die Kraftquelle kann einen Motor und eine von diesem angetriebene, horizontal verlaufende Gewindespindel sowie eine auf der Gewindespindel verschraubbare Gewindemutter umfassen, die in kraftschlüssiger Verbindung mit einem seitlichen Bereich eines Profilelements steht. Diese Art der Kraftquelle wird dort eingesetzt, wo auf den seitlichen Bereich des Profilelementes Kräfte in beiden Richtungen, also Zug- und Druckkräfte, ausgeübt werden sollen.The power source may comprise a motor and a horizontally extending threaded spindle driven by the latter and a threaded nut which can be screwed onto the threaded spindle and which is in frictional connection with a lateral region of a profile element. This type of power source is used where forces are to be exerted on the lateral region of the profile element in both directions, that is, tensile and compressive forces.
Soweit es ausreicht, auf den seitlichen Bereich der Profilelemente ausschließlich eine Zugkraft aufzubringen, kann die Kraftquelle einen Motor und eine von diesem angetriebene Trommel umfassen, auf welcher ein mit einem seitlichen Bereich eines Profilelements verbundenes flexibles Zugmittel, beispielsweise ein Seil, aufwickelbar ist, das zumindest in dem dem Profilelement benachbarten Bereich horizontal verläuft. Der Antrieb über ein flexibles Zugmittel ist noch kostengünstiger, platzsparender und variabler als derjenige über eine Gewindespindel. Zudem kann das flexible Zugmittel zur Vervielfachung der Kraft auch flaschenzugartig geführt werden.As far as it is sufficient to apply only a tensile force on the lateral region of the profile elements, the power source may comprise a motor and a drum driven by this, on which one with a lateral region a flexible element connected to a profile element, for example a cable, can be wound, which runs horizontally at least in the region adjacent to the profile element. The drive via a flexible traction means is even more cost-effective, space-saving and variable than that via a threaded spindle. In addition, the flexible traction means for multiplying the force can also be guided flaschenzugartig.
Im einfachsten Falle wird die Kraft, die zur elastischen Verformung der Profilelemente dient, einseitig an einem seitlichen Bereich eines Profilelementes eingeleitet. Diese einseitige Art der Krafteinleitung hat allerdings zur Folge, dass sich die Oberstruktur bei ihrer Vertikalbewegung gleichzeitig in gewissem Ausmaße horizontal bewegt. Dies ist in vielen Fällen problemlos hinnehmbar.In the simplest case, the force which serves to elastically deform the profile elements is introduced on one side on a lateral region of a profile element. However, this unilateral nature of the introduction of force has the consequence that the upper structure simultaneously moves to a certain extent horizontally during its vertical movement. This is easily acceptable in many cases.
Eine gleichzeitig mit der Vertikalbewegung auftretende Horizontalbewegung der Oberstruktur lässt sich dadurch vermeiden, dass die Kraft zweiseitig an zwei gegenüberliengenden seitlichen Bereichen desselben Profilelements oder unterschiedlicher Profilelemente einleitbar ist.A horizontal movement of the upper structure occurring simultaneously with the vertical movement can be avoided by virtue of the fact that the force can be introduced on two opposite lateral areas of the same profile element or different profile elements.
In allen Fällen ist die Vertikalbewegung der Oberstruktur gegenüber der Unterstruktur mit einer Relativbewegung zwischen der Verbindungsstruktur und der Oberstruktur sowie zwischen der Verbindungsstruktur und der Unterstruktur zumindest in bestimmten Bereichen verbunden. Wo also diese Relativbewegung stattfindet, sollte die Materialwahl so getroffen werden, dass nur eine geringe Reibung auftritt.In all cases, the vertical movement of the upper structure relative to the substructure is associated with a relative movement between the connection structure and the upper structure and between the connection structure and the substructure, at least in certain areas. So where this relative movement takes place, the choice of materials should be made so that only a slight friction occurs.
Benachbarte Profilelemente können mit seitlichen Bereichen unmittelbar aneinander anstoßen. Diese Konstruktion wird dann gewählt, wenn bei einer vorgegebenen Fläche der Oberstruktur eine möglichst große Tragkraft erreicht werden soll.Adjacent profile elements can abut each other directly with lateral areas. This design is chosen when a maximum surface load is to be achieved for a given area of the top structure.
Wenn dagegen unter Beibehaltung einer vorgegebenen Fläche der Oberstruktur eine geringere Tragkraft ausreicht, ist es möglich, dass benachbarte Profilelemente einen seitlichen Abstand voneinander aufweisen. Dabei können benachbarte Profilelemente durch mindestens ein kraftübertragendes Distanzstück miteinander verbunden sein.If, however, while maintaining a predetermined area of Upper structure a lower load capacity sufficient, it is possible that adjacent profile elements have a lateral distance from each other. In this case, adjacent profile elements may be connected to each other by at least one force-transmitting spacer.
Mindestens ein Bereich mindestens eines Profilelementes ist bevorzugt unverschiebbar mit der Unterstruktur und/oder der Oberstruktur verbunden. Eine derartige Art der Verbindung kann dazu dienen, die Lage der Verbindungsstruktur zwischen Unterstruktur und Oberstruktur zu definieren, also dafür zu sorgen, dass sich nicht die gesamte Verbindungsstruktur bei einer seitlichen Kraftbeaufschlagung verschiebt.At least one area of at least one profile element is preferably immovably connected to the substructure and / or the upper structure. Such a type of connection can serve to define the position of the connection structure between the substructure and the upper structure, ie to ensure that the entire connection structure does not shift during a lateral application of force.
Eine unverschiebbare Befestigung eines seitlichen Bereiches eines Profilelementes kann auch dort Sinn machen, wo mehrere Profilelemente nebeneinander verwendet werden, die jedoch nicht aneinander angrenzen und auch nicht über ein gesondertes Kraft übertragendes Distanzstück miteinander verbunden sind. Die Reaktionskraft auf die seitliche, verformende Kraft wird in diesem Falle über den nicht verschiebbaren Randbereich des Profilelements in die Ober oder Unterstruktur eingeleitet.An immovable attachment of a lateral region of a profile element can also make sense where several profile elements are used side by side, but not adjacent to each other and are not connected to one another via a separate force transmitting spacer. The reaction force on the lateral, deforming force is introduced in this case via the non-displaceable edge region of the profile element in the upper or substructure.
Der Hub, der mit einem erfindungsgemäßen Hubtisch erreichbar ist, lässt sich dadurch vergrößern, dass mindestens zwei Profilelemente übereinander angeordnet sind. In diesem Falle addieren sich die Hübe, die mit jedem der übereinander angeordneten Profilelemente erreichbar sind.The stroke, which can be achieved with a lifting table according to the invention, can be increased by arranging at least two profile elements one above the other. In this case, add the strokes that are achievable with each of the superposed profile elements.
Die übereinander angeordneten Profilelemente können entweder gleichsinnig oder gegensinnig angeordnet sein. Unter "gleichsinnig" wird dabei dieselbe Orientierung der beiden Profilelemente im Raum verstanden, während bei einer gegensinnigen Anordnung eines der Profilelemente um 180° verdreht ist, so dass dessen Oberseite zur Unterseite wird.The superimposed profile elements can be arranged either in the same direction or in opposite directions. The term "in the same direction" is understood to mean the same orientation of the two profile elements in space, while in an opposing arrangement, one of the profile elements is rotated through 180 ° so that its upper side becomes the lower side.
Der Hubtisch kann aus zwei übereinander liegenden Unterhubtischen zusammengesetzt sein, von denen jeder eine Unterstruktur, eine Verbindungsstruktur und eine Oberstruktur besitzt. Diese Ausführungsform der Erfindung ermöglicht ein modulartiges Zusammenstellen eines Hubtisches je nach gewünschter Hubgröße aus mehreren identisch aufgebauten Unterhubtischen, die grundsätzlich alle für sich alleine funktionsfähig sind. Dabei ist es möglich, dass alle "Unterhubtische" im "Gesamthubtisch" durch ein und dieselbe Kraftquelle synchron betätigt werden; alternativ ist es auch denkbar, dass verschiedene Unterhubtische getrennt voneinander durch separate Kraftquellen betätigt werden.The lift table may be composed of two superimposed sub-lift tables, each of which has a sub-structure, a connection structure and a top structure. This embodiment of the invention allows a modular assembly of a lifting table depending on the desired stroke size of a plurality of identically constructed Unterhubtischen, which are basically all functional on their own. It is possible that all "Unterhubtische" are operated synchronously in the "total lift" by one and the same power source; Alternatively, it is also conceivable that different Unterhubtische be operated separately from each other by separate power sources.
Bei einem bevorzugten Ausführungsbeispiel der Erfindung ist mindestens ein Profilelement an einem oberen oder unteren Scheitelbereich, mit welchem es an der Unterstruktur oder an der Oberstruktur oder an dem Scheitelbereich eines anderen Profilelements anliegt, mit einem rippenartigen Vorsprung versehen, der eine ebene Auflagefläche bildet. Auf diese Weise gelingt eine präzise, nicht nur punkt- oder linienhafte Kraftübertragung.In a preferred embodiment of the invention, at least one profile element at an upper or lower vertex area, with which it bears against the substructure or on the upper structure or on the vertex area of another profile element, is provided with a rib-like projection which forms a flat bearing surface. In this way, a precise, not just punctiform or linear power transmission succeeds.
Der rippenartige Vorsprung kann auch eine gesondertes, nachträglich mit dem Profilelement verbundenes Teil sein, das aus einem reibungsarmen Kunststoff besteht.The rib-like projection can also be a separate, subsequently connected to the profile element part, which consists of a low-friction plastic.
Entsprechend können mindestens zwei Profilelemente an ihren seitlichen, aneinander anstoßenden Bereichen mit einem rippenartigen Vorsprung versehen sein, der eine ebene Anlagefläche bildet.Accordingly, at least two profile elements may be provided at their lateral, abutting areas with a rib-like projection which forms a planar contact surface.
Bevorzugt wird, dass mindestens ein Profilelement einseitig offen ist. Unter "einseitig offen" wird hier eine Profilform verstanden, die freie Ränder an der Unter- oder Oberseite aufweist. Beispiele für derartige "einseitig offene" Profilelemente sind solche, welche die Form einer Kreiszylinder-Teilmantelfläche besitzen oder dachartig geformt sind. Durch eine bereits in entspanntem Zustand vorhandene Vorkrümmung wird hier ein definiertes Verformungsverhalten bei Kraftbeaufschlagung erzielt.It is preferred that at least one profile element is open on one side. By "unilaterally open" is meant here a profile shape having free edges on the bottom or top. Examples of such "unilaterally open" profile elements are those which have the shape of a circular cylinder partial circumferential surface own or roof-shaped. By already existing in a relaxed state Vorkrümmung here a defined deformation behavior is achieved when applying force.
Bei derartigen Hubtischen mit "einseitig offenen" Profilelementen gleitet zumindest ein freier Rand eines Profilelementes, wie schon oben mehrfach erwähnt, gegenüber der benachbarten Ober- oder Unterstruktur. Es empfiehlt sich daher, dass dieser mindestens eine Rand des Profilelementes in einem Bauelement befestigt ist, das entlang der Unterstruktur oder Oberstruktur verschiebbar geführt ist.In such lift tables with "one-sided open" profile elements slides at least one free edge of a profile element, as already mentioned several times above the adjacent upper or lower structure. It is therefore recommended that this at least one edge of the profile element is fixed in a component which is displaceably guided along the substructure or upper structure.
Der Einsatz von mehreren getrennten Profilelementen neben- oder übereinander hat den Vorteil, dass zur Herstellung der Verbindungsstruktur verhältnismäßig kleine, modulartig zusammensetzbare Bauelemente verwendet werden können. Im Einzelfall kann es jedoch günstiger sein, wenn mindestens zwei Profilelemente einstückig miteinander verbunden sind. Dieses Konstruktionsprinzip kann so weit geführt werden, dass schließlich die gesamte Verbindungsstruktur einstückig ist.The use of several separate profile elements side by side or one above the other has the advantage that for the production of the connection structure relatively small, modular components composable components can be used. In individual cases, however, it may be cheaper if at least two profile elements are integrally connected to each other. This design principle can be carried so far that eventually the entire connection structure is integral.
Das mindestens eine Profilelement kann auch schlauchartig ausgestaltet sein. Zum Anheben der Oberstruktur wird dieses schlauchartige Profilelement gewissermaßen in horizontaler Richtung "gequetscht".The at least one profile element can also be designed like a tube. To lift the upper structure of this hose-like profile element is effectively "squeezed" in the horizontal direction.
Schlauchartige Profilelemente, die bei der vorliegenden Erfindung verwendet werden, können an gegenüberliegenden Enden offen sein. Dadurch ist es möglich, dass die im Innenraum des Profilelementes eingeschlossene Luft bei der Verformung des Profilelementes entweicht und auf diese Weise keinen Einfluss auf die Verforlnungseigenschaften des Profilelementes besitzt.Tubular profile elements used in the present invention may be open at opposite ends. This makes it possible that the air trapped in the interior of the profile element escapes during the deformation of the profile element and in this way has no influence on the Verforlnungseigenschaften of the profile element.
Es ist aber auch möglich, dass das schlauchartige Profilelement ringsum geschlossen ist. Die in dem Profilelement enthaltene Luft ist also eingesperrt, so dass sie beispielsweise bei einer durch die Verformung bewirkten Volumenverringerung komprimiert werden muss. Sie trägt auf diese Weise zur Verformungscharakteristik des Profilelementes bei und kann beispielsweise die Tragkraft des gesamten Hubtisches beeinflussen.But it is also possible that the tubular profile element is closed all around. The included in the profile element Air is thus trapped, so that it must be compressed, for example, at a caused by the deformation volume reduction. It contributes in this way to the deformation characteristics of the profile element and can, for example, affect the load capacity of the entire lifting table.
Der Effekt, der durch das eingeschlossene Luftvolumen auf die Verformungscharakteristik ausgeübt wird, kann bei einer Ausführungsform der Erfindung dadurch verändert werden, dass der Druck des in dem Profilelement eingeschlossenen Gases einstellbar ist.The effect exerted on the deformation characteristic by the trapped air volume can be changed in one embodiment of the invention by adjusting the pressure of the gas trapped in the profile element.
Eine Beeinflussung der Verformungscharakteristik der Profilelemente kann auch dadurch geschehen, dass das Profilelement mindestens eine Variation seiner Wandstärke enthält. Verhältnismäßig dünne Bereiche der Wandung des Profilementes lassen sich leichter verformen als benachbarte, dickere Bereiche. Eine mögliche Anwendung dieses Prinzips besteht darin, sog. "Dünnstellenscharniere" einzuführen, um welche zwei benachbarte Bereiche des Profilelementes eine Art Drehbewegung ausführen können.An influencing of the deformation characteristics of the profile elements can also be achieved in that the profile element contains at least a variation of its wall thickness. Relatively thin areas of the wall of the profiled element are easier to deform than adjacent, thicker areas. One possible application of this principle is to introduce so-called "thin-layer hinges" around which two adjacent regions of the profile element can perform a type of rotary movement.
Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnung näher erläutert; es zeigen
- Figur 1a
- isometrisch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Hubtisches in eingefahrener Position;
- Figur 1b
- den Hubtisch der
Figur 1a mit abgenommener Oberstruktur; - Figur 1c
- den Hubtisch der
Figuren 1a und1b in ausgefahrener Position; - Figur 1d
- den Hubtisch der
Figur 1c mit abgenommener Ober- struktur; Figur 2- in isometrischer Darstellung ein Detail des Hubtisches der
Figur 1a bis 1d ; Figuren 3 bis 9- weitere Ausführungsformen von erfindungsgemäßen Hubtischen, wobei die Teilfiguren a und b jeweils den Hubtisch in eingefahrener Position und die Teilfiguren c und d den Hubtisch in ausgefahrener Position zeigen;
- Figur 10
- in der Seitenansicht einen als Verschiebetisch ausgestalteten Hubtisch, der auf dem Kontruktionsprinzip des in
den Figuren 1 und 2 dargestellten Hubtisches basiert; - Figur 11
- ein einzelnes Profilelement mit separat angefügter Gleitleiste.
- FIG. 1a
- isometrically a first embodiment of a lifting table according to the invention in the retracted position;
- FIG. 1b
- the lifting table the
FIG. 1a with removed upper structure; - Figure 1c
- the lifting table the
FIGS. 1a and1b in the extended position; - Figure 1d
- the lifting table the
Figure 1c with removed upper structure; - FIG. 2
- in isometric view a detail of the lifting table of the
FIGS. 1a to 1d ; - FIGS. 3 to 9
- further embodiments of lifting tables according to the invention, wherein the sub-figures a and b respectively show the lifting table in the retracted position and the sub-figures c and d the lifting table in the extended position;
- FIG. 10
- in the side view designed as a displacement table lift table on the Kontruktionsprinzip of the in the
FIGS. 1 and 2 illustrated lift table based; - FIG. 11
- a single profile element with separately attached sliding strip.
Zunächst wird auf die
Die Unterstruktur 2 besitzt beim dargestellten Ausführungsbeispiel zwei parallele C-Träger 2a, 2b, während die Oberstruktur 3 als ebene Tragplatte mit doppelt abgekanteten Längsrändern 3a, 3b ausgestaltet ist.The
Die Verbindungsstruktur 4 ihrerseits umfasst drei schalenförmige Profilelemente 5, die in dem in
Die achsparallelen Ränder der Profilelemente 5 sind jeweils in einer Weise, die weiter unten anhand der Figur 2 beschrieben wird, in einer Leiste 8 befestigt, die mit ihren gegenüberliegenden Enden jeweils in den beiden Profilträgern 2a, 2b verschiebbar geführt ist. Wenn verhindert werden soll, daß sich die Gesamtanordnung aus den Profilelementen 5 und den Leisten 8 entlang der Profilträger 2a und 2b verschieben kann, kann eine oder können zwei benachbarte Leisten 8 auch an den Profilschienen 2a, 2b festgelegt sein. Nachfolgend sei davon ausgegangen, daß die in
Im Bereich der oberen Scheitellinie der Profilelemente 5 ist jeweils ein rippenförmiger Vorsprung 14 mit einer ebenen Auflagefläche angeformt. Wird die Oberstruktur 3 einfach auf die Auflagenflächen der Vorsprünge 14 aufgelegt, so ergibt sich das in
Wenn auf die in
Die Profilelemente 5 bestehen aus elastischem Material, beispielsweise aus Stahlblech, bevorzugt jedoch aus faserverstärktem Kunststoff. Wird die durch den Pfeil 25 in
Da sich die Anlageflächen der rippenartigen Vorsprünge 14 zwischen der eingefahrenen Position des Hubtisches 1 nach den
Die Detailansicht der Figur 2 zeigt, wie zwei benachbarte Profilelemente 5-, 5' mit ihren benachbarten Längsrändern an zwei Leisten 8, 8' befestigt sind. Jedes Profilelement 5, 5' besitzt hierzu an seinen Längsrändern im Querschnitt kreisförmige Befestigungsrippen 17, 17', welche in im Querschnitt halbkreisförmige Nuten 19, 19' der beiden Leisten 8, 8' eingeführt sind. Wenn die Profilelemente 5, 5' bei der Betätigung des Hubtisches 1 verformt werden, drehen sich die Befestigungsrippen 17, 17' angelartig in den zugehörigen Nuten 19, 19' der Leisten 8, 8'. Auf diese Art werden übergroße lokale Verformungen und Kräfte im Bereich der Ränder der Profilelemente 5 vermieden.The detailed view of Figure 2 shows how two
Selbstverständlich ist es möglich, die Kraft, die zur Verformung der Profilelemente 5 eingesetzt wird, nicht einseitig an einem Ende der Reihe von Profilelementen 5 aufzubringen. In vielen Fällen ist es sogar zweckmäßiger, die zum Heben des Hubtisches 1 benötigte Kraft an beiden Endleisten 8 des Hubtisches 1 einzuführen, die dann selbstverständlich beide nicht an den Profilträgern 2a, 2b befestigt sein dürfen, sondern sich beide entlang der Profilträger 2a, 2b verschieben lassen müssen. Vorteil bei dieser Art der Krafteinleitung ist, daß sich die Oberstruktur 3 im wesentlichen nicht parallel zu den Profilträgern 2a, 2b (lateral) bewegt; sie kann dann sogar am rippenartigen Vorsprung 14 des mittleren Profilelements 5 befestigt werden. Hier findet in diesem Falle keine Relativbewegung zwischen der Oberstruktur 3 und dem Profilelement 5 statt.Of course, it is possible, the force that is used for the deformation of the
Grundsätzlich ist es für die vorliegende Erfindung unerheblich, wie die Kraft erzeugt wird, mit welcher die Profilelemente 5 zum Anheben der Oberstruktur 3 verformt werden. In Frage kommen hierbei insbesondere Seilzüge oder Gewindespindeln. Ein Beispiel für einen derartigen Spindelantrieb wird weiter unten anhand der
Grundsätzlich ist die Zahl der Profilelemente 5, die bei einem bestimmten Hubtisch 1 zur Anwendung kommt, nicht beschränkt. Im Einzelfalle kann bereits ein einziges Hubelement 5 ausreichen. Bei großflächigen Hubtischen 1 können auch sehr viele Profilelemente 5 eingesetzt werden.Basically, the number of
Die Profilelemente brauchen innerhalb der Verbindungsstruktur nicht unbedingt mit ihren Längsrändern aneinander anzustoßen. In
Wieder zu finden beim Hubtisch 101 sind eine Unterstruktur 102, die hier als Platte ausgeführt ist, sowie eine Oberstruktur 103, die ebenfalls als Platte gestaltet ist. Die Verbindungsstruktur 104 umfasst hier nur zwei schalenförmige, nach unten offene Profilelemente 105, deren zu den Achsen der Kreiszylinder-Mantelflächen parallele Längsränder jeweils in einer Leiste 108 befestigt sind. Die Befestigung geschieht in derselben Weise, wie dies oben anhand der Figur 2 beschrieben wurde. Die Leisten 108 sind mit einer Ausnahme, auf die unten eingegangen wird, an der Bodenstruktur 102 in einer nicht näher erläuterten Weise senkrecht zu ihrer Längserstreckung verschiebbar geführt.To be found again in the lifting table 101 are a
Statt des mittleren Profilelementes 5 des Ausführungsbeispieles der
Selbstverständlich ist es auch beim Hubtisch 101 der
Mit den in den
Eine andere Art, zwei Unterhubtische 101, 101' der in
Auch bei der Ausführungsform der
Auch bei dem in
Die jeweils innenliegenden, parallel zur Achse der Teilzyindermantelflächen verlaufenden Längsränder der Profilelemente 405, 405' sind über eine Dünnstelle, die als Scharnier wirkt, einstückig mit einer an die Unterstruktur 402 bzw. Oberstruktur 403 angeformte, parallel zu diesen Rändern verlaufende Rippe 409, 409' angesetzt. Die jeweils außen liegenden Längsränder der Profilelemente 405, 405' liegen an vertikal stehenden Betätigungsplatten 422, 423 an, die in Richtung aufeinander zu und voneinander weg beweglich an der Unterstruktur 402 bzw. der Oberstruktur 403 geführt sind.The respective inner, parallel to the axis of Teilzyindermantelflächen extending longitudinal edges of the
Ersichtlich ist diese Konstruktion so, daß durch Beaufschlagung der Betätigungsplatten 422, 423 mit einer Kraft die äußeren Längsränder der Profilelemente 405, 405' nach innen geführt werden, wodurch die Profilelemente 405, 405' verformt werden und ihre jeweilige Scheitellinie einen größeren Abstand von der benachbarten Unterstruktur 402 bzw. Oberstruktur 403 erhält. Diese Vorgänge sind durch Vergleich der
Bei dem in
Im "eingefahrenen" Zustand des Hubtisches 501, wie er in den
Entlang der Scheitellinien der Profilelemente 505, die den langen Ellipsenachsen zugeordnet sind, verlaufen ebenfalls rippenförmige, Anlageflächen bildende Vorsprünge 530, 530', über die benachbarte Profilelemente 505 aneinander anliegen. Die links und rechts ganz außen liegenden Vorsprünge 530 und 530' dienen der Einleitung der zum Anheben der Oberstruktur 502 benötigten Kräfte, beispielsweise wiederum über Betätigungsplatten, ähnlich wie sie beim Ausführungsbeispiel der
Werden auf diese Weise die schlauchförmigen Profilelemente 505 deformiert, so entsteht aus dem in den
Die Stirnseiten der schlauchförmigen Profilelemente 505 sind offen, so daß die in ihrem Innenraum eingeschlossene Luft bei der Verformung entweichen kann. Grundsätzlich ist es jedoch auch möglich, diese Stirnflächen zu verschließen, was einen Einfluß auf die "Steifigkeit" und die Tragkraft der Profilelemente 505 hat. Ggf. ist es auch möglich, den Druck des Gases, beispielsweise der Luft, innerhalb der geschlossenen Profilelemente 505 einstellbar zu machen. Dieser einstellbare Druck ist jedoch nicht zu verwechseln mit dem Druck, der beispielsweise zum Aufblasen eines blasebalgähnlichen Hubgerätes dient. Bei der vorliegenden Erfindung wird während des eigentlichen Betriebes des Hubtisches die eingeschlossene Gasmenge nicht durch Zufuhr oder Abfuhr von Gas verändert; die Hubbewegung erfolgt ausschließlich aufgrund der Verformung der Profilelemente durch eine in seitlicher Richtung wirkende Kraft.The end faces of the
Bei dem in
Diese Ausführungsform hat wiederum den Vorteil, daß sich beim Ausfahren und Einfahren des Hubtisches 601 in der Nähe der seitlichen Scheitellinien der Profilelemente 605 keine hohen lokalen Verformungen und damit Spannungen bilden.This embodiment in turn has the advantage that when extending and retracting the lifting table 601 in the vicinity of the lateral apex lines of the
Im Übrigen gilt das, was oben zum Ausführungsbeispiel der
Das in
Während beim Ausführungsbeispiel der
Die einzelnen etwa ebenen Schenkel der Verbindungsstruktur 704 sind über durch Auskehlungen gebildete, scharnierartig wirkende Dünnstellen miteinander verbunden. Bei der Verformung der Verbindungsstruktur 704 zum Anheben der Oberstruktur 703 bleiben die Schenkel der Verbindungsstruktur 704 im wesentlichen eben. Es ändert sich im wesentlichen nur der von benachbarten Schenkeln eingeschlossene Winkel, der im "eingefahrenen" Zustand des Hubtisches 701 größer als im ausgefahrenen Zustand ist.The individual approximately flat legs of the connecting
Während die obigen, anhand der
Die sich über eine Verbindungsstruktur 804 an der Unterstruktur 802 abstützende Oberstruktur 803 trägt in
Die Rollen 841 werden durch einen Getriebemotor 842 und verschiedene Riemen in bekannter Weise angetrieben.The
Die parallel zur Achse der Teilzylindermantelfläche verlaufenden Ränder der drei schalenförmigen elastischen Profilelemente 805 sind wieder in Leisten 808 "eingeknüpft", wie dies in Figur 2 dargestellt ist. Die in
Die Kraft, die zu einer seitlichen Kompression der Profilelemente 805 und damit zu einem Anheben der Oberstruktur 803 und des von dieser getragenen Rollenförderers 840 führt, kommt von einem Elektromotor 843, der bei diesem Ausführungsbeispiel am Rande des Hubtisches 801 angeordnet ist. Der Elektromotor 843 treibt eine Gewindespindel 844 an, die sich parallel zu den Profilträgern 802a, 802b, zwischen diesen, erstreckt und an ihrem freien Ende in einem Lagerbock 845 drehbar gelagert ist. Auf dieser Gewindespindel 844 läuft eine Mutter 846, die mit der in
Der gesamte Hubtisch 801 ist zwischen zwei parallel, senkrecht zur Zeichenebene der
Die in
Ein Gegenstand, welcher den Zwischenraum zwischen den beiden Rollenleisten 850 überbrückt und auf den Rollen 852 der beiden Rollenleisten 850 aufliegt, wird senkrecht zur Zeichenebene der
Nunmehr wird der Elektromotor 843 in Funktion gesetzt. Durch Drehung der Gewindespindel 844 wird die Mutter 848 in
Bei den oben beschriebenen Ausführungsbeispielen von Hubtischen waren die verschiedenen Profilelemente einstückig mit den rippenartigen Vorsprüngen verbunden, welche ebene Anlage- oder Auflageflächen bereitstellen.In the embodiments of lift tables described above, the various profile elements were integrally connected to the rib-like projections, which provide flat contact or bearing surfaces.
Dies ist bei dem in
Claims (27)
- Elevating platform for lifting and lowering heavy loads, in particular in motor-vehicle manufacture, havinga) a lower structure (2; 102; 202; 302; 402; 502; 602; 702; 802) which can be arranged on a room floor or another supporting structure;b) an upper structure (3; 103; 203; 303; 403; 503; 603; 703; 803) on which the load can be arranged;c) a connecting structure (4; 104; 204; 304; 404; 504; 604; 704; 804) which extends between the lower structure (2; 102; 202; 302; 402; 502; 602; 702, (802) and upper structure (3; 203; 303; 403; 503; 603; 703; 803) and the vertical dimension of which can be changed such that the upper structure can be raised or lowered with respect to the lower structure;d) a source of force acting on the connecting structure(4; 104; 204; 304; 404; 504; 604; 704; 804), which brings about the change of the vertical dimension of the connecting structure,
characterised in thate) the connecting structure (4; 104; 204; 304; 404; 504; 604; 704; 804) comprises at least one elastically deformable profile element (5; 105; 205; 305; 405; 505; 605; 705; 805), the vertical dimension of which can be changed by the fact that it can be subjected to a force in the horizontal direction, andf) at least two profile elements (5; 105; 205; 305; 405; 505; 605; 705; 805) are connected side by side. - Elevating platform according to Claim 1, characterised in that the source of force comprises a motor (843) and a horizontally running threaded spindle (844) driven by the latter, as well as a threaded nut (848) which can be screwed on the threaded spindle (844) and is in force-fitting connection with a lateral region of a profile element (805).
- Elevating platform according to Claim 1, characterised in that the source of force comprises a motor and a drum which is driven by the latter and onto which can be wound a flexible drive means, in particular a rope, which is connected to a lateral region of a profile element and runs horizontally at least in the region neighbouring the profile element.
- Elevating platform according to one of the preceding claims, characterised in that the force can be introduced unilaterally at a lateral region of a profile element (5; 105; 205; 305; 405; 505; 605; 705; 805).
- Elevating platform according to one of Claims 1 to 3, characterised in that the force can be introduced bilaterally at two opposite lateral regions of the same profile element or different profile elements (5; 105; 205; 305; 405; 505; 605; 705; 805).
- Elevating platform according to one of the preceding claims, characterised in that neighbouring two profile elements (5; 505; 605; 705; 805) are arranged immediately beside one another.
- Elevating platform according to Claims 1 to 5, characterised in that neighbouring profile elements (105; 405) have a lateral distance from each other.
- Elevating platform according to Claim 7, characterised in that at least one force-transmitting distance piece (121) is arranged between neighbouring profile elements (105).
- Elevating platform according to Claim 7 or 8, characterised in that at least one lateral region of at least one profile element (405) is unshiftably connected to the lower structure (402) and/or the upper structure (403).
- Elevating platform according to one of the preceding claims, characterised in that at least two profile elements (105, 105') are arranged above one another.
- Elevating platform according to Claim 10, characterised in that at least two profile elements (105, 105') are arranged in the same orientation above one another.
- Elevating platform according to Claim 10 or 11, characterised in that at least two profile elements (105, 105'; 405, 405') are arranged in opposite orientations above one another.
- Elevating platform according to Claim 11 or 12, characterised in that it is composed of two sub-elevating platforms (101, 101'), each of which possesses a lower structure (102, 102'), a connecting structure (104, 104') and an upper structure (103, 103') .
- Elevating platform according to one of Claims 10 to 13, characterised in that at least two profile ele-, ments (405, 405') are arranged above one another in a manner lying directly against one another.
- Elevating platform according to one of the preceding claims, characterised in that at least one profile element (5; 105; 205; 305; 405; 505; 605; 705; 805) is provided, at an upper or lower vertex region by which it lies against the lower structure (502; 602) or against the upper structure (3; 103; 203; 303; 403; 503; 603; 703; 803) or against the vertex region of another profile element (405'), with a rib-like projection (14; 114; 214; 314; 414; 514; 614; 714; 814) which forms a plane supporting surface.
- Elevating platform according to Claim 15, characterised in that the rib-like projection (914) is a separate part connected to the profile element (905) and made of low-friction plastic.
- Elevating platform according to Claim 6, characterised in that at least two profile elements (505, 505') are provided, at their lateral regions butting against one another, with a rib-like projection (530, 530') which forms a plane bearing surface.
- Elevating platform according to one of the preceding claims, characterized in that the at least one profile element (5; 105; 405; 705; 805) is open on one side.
- Elevating platform according to Claim 18, characterised in that the profile element (5; 105; 405; 805) has the shape of a circular cylinder partial lateral surface.
- Elevating platform according to Claim 18, characterised in that the profile element (705) is shaped in the manner of a roof.
- Elevating platform according to one of Claims 18 to 20, characterised in that at least one edge of a profile element (5; 105; 405; 705; 805) is fastened in a component (8; 108; 408; 708; 808) which is slidably guided along the lower structure (2; 102; 402; 702; 802) or the upper structure (3).
- Elevating platform according to one of the prece-, ding claims, characterised in that at least two profile elements (705) are integrally joined together.
- Elevating platform according to one of the preceding claims, characterised in that at least one profile element (505; 605) is of tubular configuration.
- Elevating platform according to Claim 23, characterised in that the tubular profile element (505; 605) is open at opposite ends.
- Elevating platform according to Claim 23, characterised in that the tubular profile element is closed all the way round.
- Elevating platform according to Claim 25, characterised in that the pressure of the gas enclosed in the profile element is adjustable.
- Elevating platform according to one of the preceding claims, characterised in that at least one profile element (605; 705) has at least one variation of its wall thickness in order to influence its deformation behaviour.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005047486A DE102005047486B4 (en) | 2005-10-04 | 2005-10-04 | Lift table |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1772417A2 EP1772417A2 (en) | 2007-04-11 |
EP1772417A3 EP1772417A3 (en) | 2009-01-21 |
EP1772417B1 true EP1772417B1 (en) | 2010-10-13 |
Family
ID=37433984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06017505A Expired - Fee Related EP1772417B1 (en) | 2005-10-04 | 2006-08-23 | Lifting table |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080011555A1 (en) |
EP (1) | EP1772417B1 (en) |
DE (2) | DE102005047486B4 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2829690A1 (en) * | 2013-07-23 | 2015-01-28 | Alstom Technology Ltd | Maintenance assembly adaptable within gas turbine engine |
CN104773675B (en) * | 2015-04-08 | 2017-11-07 | 赛埃孚汽车保修设备(太仓)有限公司 | The long-acting durable trailing arm of single-column car lift |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
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US1755088A (en) * | 1929-01-25 | 1930-04-15 | Benjamin D Vickrey | Spring jack |
US2070960A (en) * | 1936-01-11 | 1937-02-16 | Rodney F Phillips | Jack |
US2610824A (en) * | 1948-03-03 | 1952-09-16 | Henry G Stowe | Portable fluid operated lifting jack |
US2665109A (en) * | 1949-09-09 | 1954-01-05 | Michael S Romby | Spring tool |
US3174722A (en) * | 1962-09-17 | 1965-03-23 | Erhard J Alm | Load lifting device |
US3751007A (en) * | 1971-12-27 | 1973-08-07 | C Hollerith | Jack using flexible expansible motor |
US3785462A (en) * | 1972-06-23 | 1974-01-15 | Applied Radiation Corp | Scissor lift and drive mechanism therefor |
US3976281A (en) * | 1975-06-30 | 1976-08-24 | The United States Of America As Represented By The Secretary Of The Army | Variable height work surface |
DE2619347C3 (en) * | 1976-04-30 | 1978-12-07 | Alfons Dr.-Ing. 8901 Neusaess Braun | Drive device for a component which is arranged on a straight guide and is to be moved along this straight guide |
GB1604141A (en) * | 1978-01-05 | 1981-12-02 | Modern Precision Engs & Associ | Air cushion lifting device |
US4319666A (en) * | 1979-10-29 | 1982-03-16 | Lee Hunter | Vehicle service jack |
DE3134516A1 (en) * | 1981-09-01 | 1983-03-17 | Fa. Hans-Jürgen Mohr, 8832 Weißenburg | ELECTRONIC SWITCHING DEVICE |
FR2627573B1 (en) * | 1988-02-23 | 1990-07-06 | Micro Controle | LIFTING TABLE, PARTICULARLY FOR LABORATORY MATERIALS |
DE4032674A1 (en) * | 1990-10-15 | 1992-04-16 | Prinzess Moebel Gustav Weritz | Folding table supported by scissors-type linkage - has tension spring to provide initial erection force |
NO311989B1 (en) * | 1990-11-05 | 2002-02-25 | Audun Haugs | Device by tensioning means |
CZ278183B6 (en) * | 1991-05-22 | 1993-09-15 | Vesely Frantisek | Opening element particularly for lifting gears with a pair arrangement of levers |
DE19526596B4 (en) * | 1995-07-21 | 2004-12-16 | Pro Hub Hebetechnik Gmbh | Scissor |
US5979605A (en) * | 1996-10-23 | 1999-11-09 | Popp; Thomas J. | Adjustable vehicle service area and service walkway |
FR2770835B1 (en) * | 1997-11-12 | 2000-01-28 | Peugeot | LIFTING DEVICE FOR MOTOR VEHICLE |
JP3381248B2 (en) * | 1998-03-23 | 2003-02-24 | トヨタ自動車株式会社 | Fuel tank |
EP1033507A1 (en) * | 1999-03-04 | 2000-09-06 | Baumann Federn AG | Spring arrangement |
GB0107999D0 (en) * | 2001-03-30 | 2001-05-23 | Mangar Int Ltd | Lifting and lowering apparatus |
US7163087B2 (en) * | 2003-12-15 | 2007-01-16 | Brian Patrick Putnam | Portable vehicle lift |
US7328622B2 (en) * | 2005-06-30 | 2008-02-12 | The Boeing Company | Soft support systems and methods for dynamically testing structures |
-
2005
- 2005-10-04 DE DE102005047486A patent/DE102005047486B4/en not_active Expired - Fee Related
-
2006
- 2006-08-23 EP EP06017505A patent/EP1772417B1/en not_active Expired - Fee Related
- 2006-08-23 DE DE502006008067T patent/DE502006008067D1/en active Active
- 2006-10-03 US US11/542,696 patent/US20080011555A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP1772417A3 (en) | 2009-01-21 |
DE102005047486A1 (en) | 2007-04-12 |
US20080011555A1 (en) | 2008-01-17 |
DE502006008067D1 (en) | 2010-11-25 |
EP1772417A2 (en) | 2007-04-11 |
DE102005047486B4 (en) | 2007-06-14 |
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