EP1454873B1 - Scissor lift device - Google Patents

Scissor lift device Download PDF

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Publication number
EP1454873B1
EP1454873B1 EP03004756A EP03004756A EP1454873B1 EP 1454873 B1 EP1454873 B1 EP 1454873B1 EP 03004756 A EP03004756 A EP 03004756A EP 03004756 A EP03004756 A EP 03004756A EP 1454873 B1 EP1454873 B1 EP 1454873B1
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EP
European Patent Office
Prior art keywords
lift device
scissor
scissor lift
traction means
coupling
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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 - Lifetime
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EP03004756A
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German (de)
French (fr)
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EP1454873A1 (en
Inventor
Michael Kaufmann
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PRO HUB Hebetechnik GmbH
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PRO HUB Hebetechnik GmbH
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Priority to DE50305742T priority Critical patent/DE50305742D1/en
Priority to AT03004756T priority patent/ATE346011T1/en
Priority to EP03004756A priority patent/EP1454873B1/en
Priority to US10/792,283 priority patent/US7213686B2/en
Priority to CNB2004100074726A priority patent/CN1315717C/en
Publication of EP1454873A1 publication Critical patent/EP1454873A1/en
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Publication of EP1454873B1 publication Critical patent/EP1454873B1/en
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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
    • B66F7/065—Scissor linkages, i.e. X-configuration

Definitions

  • the invention relates to a scissor lift device with at least two pairs of scissors connected by a pivot axis, wherein the pivot axis between the respective end portions of the scissor members is arranged, and with a drive for raising and lowering the scissor members by means of a traction means, with at least one coupling bridge with two pivotally arranged push rods , which are pivotally connected to a respective scissor member, wherein the coupling bridge carries a deflection roller for the fixed to the scissor lift traction means.
  • Such a scissor lift device is for example the subject of WO 99/62813 A1, which corresponds to the preamble of claim 1.
  • the traction means are formed by rods which are interconnected by means of a pivotable two-armed lever.
  • the distance between the upper or the lower ends of the scissor members is changed by the traction means.
  • the traction means is connected to one end of one of the scissor members and by means of a deflection roller at an upper end of the other scissor member to the drive and thereby retractable.
  • the traction means acts on an expansion body, which lies in the lowered rest position of the scissor lift near the lower end of a scissor link between this and the resting upper end of the other scissor member.
  • the traction means is not wound up by means of the drive, but has a closed end to a loop portion, so as to prevent slipping of the traction means.
  • US 4 858 888 already discloses a scissor lift device in which the free end of the support arm is guided by an angled guide arm, which is also articulated to the first scissor member.
  • the invention has for its object to provide a way to perform a Scherenhubvorraum of the type mentioned in such a way that the drive power required during operation is substantially reduced. Furthermore, the Scherenhubvorraum should be designed customizable with little effort to different applications.
  • the scissor lift device has two coupling bridges arranged on both sides of the pivot axis, wherein the first coupling bridge is equipped with at least one deflection roller and the second coupling bridge is provided with a fixation for the traction means.
  • the coupling bridge is equipped with the deflection roller, so that by applying the tensile force of the distance and thereby at the same time the lifting height can be changed with little effort.
  • the peak load to be applied by the drive is substantially reduced.
  • a significantly lower wear because the deflection of the traction means is subject to only very low friction losses.
  • the scissor lift allows a simple adaptation to different bedingengen by only the traction means must be replaced with larger load requirements. Cumbersome redesigns can be avoided in many cases.
  • a considerably uniform force is achieved in the scissor members by the two opposite coupling bridges by means of the respective thrust struts, thereby increasing the reliability and at the same time reduces the burden of individual thrust struts.
  • a particularly advantageous development is also realized in that the pivot axis and the coupling bridges are arranged in a common, in particular horizontal, plane. As a result, a uniform lifting movement is achieved while reducing fluctuations in the required drive power between the extreme positions of the scissor lift.
  • a modification of the present invention is particularly simple, in which the traction means between the two coupling bridges is repeatedly guided back and forth in several paths by means of a plurality of deflection rollers arranged on the two coupling bridges.
  • the in particular parallel to each other guided webs could be in a common horizontal, in particular determined by the pivot axis level next to each other. It is particularly useful, however, if the tracks of the traction means are arranged one above the other. As a result, the deflection of the traction means takes place even in a stationary outside of the scissor lift device positioned drive for the traction means exclusively in one plane. The thus acting on the traction load and any signs of wear are significantly reduced.
  • a particularly promising development of the invention is also created in that a plurality of mutually parallel traction means wrap around the pulley in opposite directions.
  • the parallel guided traction means can be performed both on a common deflection roller as well as on individual, in particular coaxial, pulleys.
  • the traction means may be designed, for example, as a plastic or wire rope, as a chain or as a wedge or toothed belt. In contrast, a design in which the traction means is designed at least in sections as a belt is particularly practical.
  • the webbing combines high flexibility and tensile strength and also requires no lubricant. Furthermore, the webbing can be used without disturbing operating noise and allows a flat overall height.
  • a particularly versatile embodiment of the invention is also achieved in that the scissor lift device is modularly expandable by means of further paired scissor members.
  • double or tandem constructions can be realized with little effort, which can be actuated by a single common traction means.
  • a required according to the prior art control effort for a synchronous movement thus eliminated.
  • several traction means are used, they can be actuated according to a further advantageous embodiment, in particular by means of a common drive.
  • Another particularly promising embodiment of the present invention is achieved in that the two coupling bridges are connected to one another by means of a continuously variable length to adapt to different lifting heights guide element.
  • This particular telescopically executed guide element limits the relative mobility of the two coupling bridge to each other to only one degree of freedom, so that only the distance between the two coupling bridges is variable. The orientation of the coupling bridges is thus unchangeable.
  • the guide element is designed as a damper or emergency actuator, so as to avoid inadvertent lowering of the lifting device in a sudden strain relief.
  • the guide element In normal operation, for example, equipped with a hydraulic cylinder guide element allows damping during load changes.
  • the drive can be arranged spatially separated from the scissor lift stationary. However, an embodiment is particularly compact if the drive is arranged on the coupling bridge in a plane determined by the joints of the push rods and the pivot axis.
  • Several drives can each be assigned to a coupling bridge and arranged opposite each other.
  • FIG. 1 shows a scissor lift device 1 according to the invention in a side view.
  • the scissor lift device 1 has two scissor members 4, 5 arranged below a lifting plane 2 and connected in pairs by a pivot axis 3, wherein the pivot axis 3 lies in the middle between the respective end sections 6, 7 carrying the lifting plane 2, and end sections 9 resting on a bottom surface 8, 10 of the scissor members 4, 5 is arranged.
  • the scissor lift device 1 is equipped with a fixedly arranged on the bottom surface 8 drive 11, on its winding drum 12 designed as a belt tension means 13 for raising and lowering the scissor members 4, 5 is equipped.
  • the scissor lift device 1 with two on both sides of the pivot axis 3 arranged parallel to each other, coupling bridges 14, 15 equipped, the first coupling bridge 14 with at least two pulleys 16 and the second coupling bridge 15 with a guide roller 16 and a fixing 17 for the traction means 13 equipped is, so that the traction means 13 in several tracks 18, 19, 20, 21 is guided over each other.
  • the two coupling bridges 14, 15 are each supported by two identical push rods 22, 23 on the scissor members 4, 5 pivotally.
  • the coupling bridges 14, 15 are connected by an acting as a damper, in particular realized by a cylinder, guide member 24 so that load changes do not lead to undesirably high peak loads.
  • FIG. 2 shows, in a detailed view of the scissor lifting device 1 shown in FIG. 1, a further traction means 25 which is guided in a plane parallel to the plane of representation and which is actuated by the common drive 11.
  • a further traction means 25 which is guided in a plane parallel to the plane of representation and which is actuated by the common drive 11.
  • the pulleys 16 In contrast to the course shown in Figure 1 of the tracks 18, 19, 20, 21 of the traction means 13, wraps around the other train means 25, the pulleys 16 in opposite directions. This lifted by the tensile force F of the traction means 13, 25 initiated moments against each other.
  • FIG. 3 shows an enlarged detail view of the scissor lifting device 1 shown in FIG. 1 in a lowered position, in which the coupling bridges 14, 15 have a distance A.
  • the traction means 13 is guided by means of a fixed to the second coupling bridge 15 guide roller pair 26.
  • the required tensile forces in the illustrated lowered position only slightly deviate from the operating position shown in FIG. 1, so that a uniform stroke movement is achieved with a constant pulling movement of the traction mechanism 13.
  • FIG. 4 shows the scissor lift device 1 in a modified form with two scissor members 4, 5 connected below the lifting plane 2 by means of the stationary drive 11 arranged on the bottom surface 8, on the winding drum 12 of which the pulling means 13 for erecting and lowering the scissor members 4 , 5 is fixed.
  • the scissor lift device 1 has in this embodiment, only a single side of the pivot axis 3 arranged coupling bridge 14, which carries a plurality of deflection rollers 16.
  • the fixation 17 for the traction means 13 is connected to the pivot axis 3 in a common vertical plane, so that the traction means 13 in several tracks 18, 19, 20, 21 is guided one above the other.
  • the coupling bridge 14 is supported by two identical push rods 22, 23 on the scissor members 4, 5 pivotally.
  • the distance a of the coupling bridge 14 from the pivot axis 3 is variable, so that the lifting height h can be set in the desired manner.
  • To stabilize the coupling bridge 14 is connected by the guide member 24 with the pivot axis 3, so that a substantially vertical orientation of the coupling bridge 14 is guaranteed at different heights h.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Glass Compositions (AREA)
  • Insulated Conductors (AREA)
  • Sanitary Device For Flush Toilet (AREA)
  • Types And Forms Of Lifts (AREA)

Abstract

The scissor lift device (1) has a pair of scissor members (4,5) connected by a pivot (3) installed between the respective end sections (6-9) of the members. The scissor lift has at least one coupling bridge (14,15) with two pivotably movable thrust struts (22,23) which are pivotably connected to the corresponding scissor member. The coupling bridge supports a deflection roller (16) for the traction element (13) fixed on the scissor lift device to straighten and lower it.

Description

Die Erfindung betrifft eine Scherenhubvorrichtung mit zumindest zwei paarweise durch eine Schwenkachse verbundenen Scherengliedern, wobei die Schwenkachse zwischen den jeweiligen Endabschnitten der Scherenglieder angeordnet ist, und mit einem Antrieb zum Aufrichten und Absenken der Scherenglieder mittels eines Zugmittels, mit zumindest einer Koppelbrücke mit zwei schwenkbeweglich angeordneten Schubstreben, die mit jeweils einem Scherenglied schwenkbeweglich verbunden sind, wobei die Koppelbrücke eine Umlenkrolle für das an der Scherenhubvorrichtung festgelegte Zugmittel trägt.The invention relates to a scissor lift device with at least two pairs of scissors connected by a pivot axis, wherein the pivot axis between the respective end portions of the scissor members is arranged, and with a drive for raising and lowering the scissor members by means of a traction means, with at least one coupling bridge with two pivotally arranged push rods , which are pivotally connected to a respective scissor member, wherein the coupling bridge carries a deflection roller for the fixed to the scissor lift traction means.

Eine solche Scherenhubvorrichtung ist beispielsweise Gegenstand der WO 99/62813 A1, welcher dem Oberbegriff des Anspruchs 1 entspricht. Die Zugmittel sind dabei durch Stangen gebildet, die mittels eines schwenkbeweglichen zweiarmigen Hebels miteinander verbunden sind.Such a scissor lift device is for example the subject of WO 99/62813 A1, which corresponds to the preamble of claim 1. The traction means are formed by rods which are interconnected by means of a pivotable two-armed lever.

Die DE 91 08 825 U1 beschreibt auch bereits einen Scherenhubtisch mit zwei paarweise durch eine Schwenkachse verbundenen Scherengliedern, wobei die Schwenkachse zwischen den jeweiligen Endabschnitten der Scherenglieder angeordnet ist, wobei zwei schwenkbeweglich angeordnete Schubstreben paarweise mit jeweils einem Scherenglied verbunden sind. Der Scherenhubtisch hat einen Antrieb zum Aufrichten und Absenken der Scherenglieder durch eine Spindel, welche die beiden die Schubstrebenpaare verbindenden Koppelbrücken verbindet.DE 91 08 825 U1 also already describes a scissor lift with two paired by a pivot axis connected scissor members, wherein the pivot axis between the respective end portions of the scissor members is arranged, wherein two pivotally arranged push rods are connected in pairs, each with a scissor member. The scissor lift has a drive for raising and lowering the scissor members by a spindle which connects the two connecting bridges connecting the push strut pairs.

Gemäß der DE 100 24 075 A 1 wird durch das Zugmittel der Abstand zwischen den oberen oder den unteren Enden der Scherenglieder verändert. Hierzu ist das Zugmittel mit einem Ende eines der Scherenglieder und mittels einer Umlenkrolle an einem oberen Ende des anderen Scherengliedes mit dem Antrieb verbunden und dadurch einziehbar. Das Zugmittel wirkt dabei auf einen Spreizkörper, der in der abgesenkten Ruhestellung der Scherenhubvorrichtung nahe des unteren Endes eines Scherengliedes zwischen diesem und dem aufliegenden oberen Ende des anderen Scherengliedes liegt. Durch Aufbringen der erforderlichen Zugkraft wird der Spreizkörper in Richtung der Schwenkachse bewegt. Der von den Scherengliedern eingeschlossene Winkel wird dadurch zunehmend größer, so dass die Hubhöhe entsprechend verändert wird. Das Zugmittel wird dabei mittels des Antriebes nicht aufgewickelt, sondern hat einen zu einer Schlaufe geschlossenen Endabschnitt, um so ein Abgleiten des Zugmittels zu verhindern.According to DE 100 24 075 A 1, the distance between the upper or the lower ends of the scissor members is changed by the traction means. For this purpose, the traction means is connected to one end of one of the scissor members and by means of a deflection roller at an upper end of the other scissor member to the drive and thereby retractable. The traction means acts on an expansion body, which lies in the lowered rest position of the scissor lift near the lower end of a scissor link between this and the resting upper end of the other scissor member. By applying the required tensile force of the spreader is moved in the direction of the pivot axis. The included by the scissor members angle is thereby increasingly larger, so that the lifting height is changed accordingly. The traction means is not wound up by means of the drive, but has a closed end to a loop portion, so as to prevent slipping of the traction means.

Als nachteilig erweist sich bei solchen Scherenhubvorrichtungen, deren Hubhöhe mittels eines Spreizkörpers variiert wird, dass sich die Hebelverhältnisse in der abgesenkten Ruhestellung gegenüber der angehobenen Arbeitsstellung erheblich unterscheiden. Die zur Änderung der Hubhöhe erforderlichen Kräfte differieren dadurch in den beiden Extremstellungen um ein Vielfaches. Dies führt in der Praxis zu Verschleißerscheinungen. Zudem werden dadurch große Antriebleistungen erforderlich. Weiterhin ist es erforderlich, die Bewegung des Spreizkörpers mit Hilfe einer aufwendigen Steuerung derart zu beeinflussen, dass die Hubgeschwindigkeit zwischen den Extremstellungen annähernd konstant ist, zumindest aber keinen unerwünscht hohen Schwankungen unterworfen ist.A disadvantage proves in such Scherenhubvorrichtungen whose lift height is varied by means of an expansion body that the lever ratios in the lowered rest position significantly different from the raised working position. The forces required to change the lifting height differ by a multiple in the two extreme positions. This leads to wear in practice. In addition, this large drive power required. Furthermore, it is necessary the movement of the Spreizkörpers with the help of a complex control to influence such that the lifting speed between the extreme positions is approximately constant, but at least no undesirable high fluctuations is subjected.

Eine andere Ausführung einer Scherenhubvorrichtung ist auch bereits durch die DE 33 31 872 A 1 bekannt. Dabei sind die beiden Endabschnitte der Scherenglieder durch einen als Hydraulikzylinder ausgeführten Antrieb miteinander verbunden. Dies bedingt jedoch einen großen Stellweg des Hydraulikzylinders, wobei auch hierbei stark abweichende Kräfteeinleitungen auftreten. Zudem sind in der Praxis bei vielen Einsatzzwecken Hydraulikzylinder aufgrund des freigesetzten Öls nur bedingt geeignet.Another embodiment of a scissor lift device is already known from DE 33 31 872 A1. The two end portions of the scissor members are connected by a drive designed as a hydraulic cylinder drive. However, this requires a large travel of the hydraulic cylinder, which also occur here deviating force inputs. In addition, in practice for many uses hydraulic cylinder due to the released oil only partially suitable.

Durch die DE 298 03 330 U ist auch bereits eine Scherenhubvorrichtung bekannt geworden, bei der es sichergestellt ist, dass auch bereits in der Anfangsphase des Hubvorganges aufgrund günstiger Hebelverhältnisse relativ hohe Hubkräfte bei vergleichsweise geringen Antriebskräften erzeugt werden können. Es ist hier jedoch nachteilig, dass sich im Hub- und Senkvorgang zwei Geschwindigkeitsstufen daraus ergeben, dass beim Erfassen des Spreizkörpers durch einen abstützenden Schwenkarm eine ruckartige Geschwindigkeitsänderung eintritt. Der Spreizkörper wirkt hier vor dem Eingriff des Schwenkarmes lediglich nach dem Keilprinzip auf das obere und das untere Scherenglied ein, so dass die Aufwärtsbewegung extrem langsam erfolgt. Sobald der Spreizkörper durch den abstützenden Schwenkarm abgehoben wird, entsteht lediglich eine Wirkverbindung mit der oberen Scherenhälfte, wobei die Aufwärtsbewegung sprunghaft beschleunigt wird. Im Übergangsbereich ist dadurch eine exakte Positionierung nicht möglich ist.By DE 298 03 330 U also a scissor lift is already known, in which it is ensured that even in the initial phase of the lifting operation due to favorable leverage relatively high lifting forces can be generated at relatively low driving forces. However, it is disadvantageous here that in the lifting and lowering process two speed levels result from the fact that a sudden change in speed occurs when the expansion body is detected by a supporting pivot arm. The expansion body acts here before the engagement of the pivot arm only after the wedge principle on the upper and lower scissor member, so that the upward movement is extremely slow. Once the spreader is lifted by the supporting pivot arm, only an operative connection with the upper scissor half, wherein the upward movement is accelerated by leaps and bounds. In the transition area an exact positioning is not possible.

Durch die US 4 858 888 ist ferner auch bereits eine Scherenhubvorrichtung offenbart, bei der das freie Ende des Stützarmes von einem abgewinkelt angelenkten Führungsarm geführt ist, der außerdem an dem ersten Scherenglied gelenkig befestigt ist.Furthermore, US 4 858 888 already discloses a scissor lift device in which the free end of the support arm is guided by an angled guide arm, which is also articulated to the first scissor member.

Der Erfindung liegt die Aufgabe zugrunde, eine Möglichkeit zu schaffen, eine Scherenhubvorrichtung der eingangs genannten Art derart auszuführen, dass die im Betrieb erforderliche Antriebsleistung wesentlich reduziert ist. Weiterhin soll die Scherenhubvorrichtung mit geringem Aufwand an unterschiedliche Einsatzzwecke anpassbar ausgeführt sein.The invention has for its object to provide a way to perform a Scherenhubvorrichtung of the type mentioned in such a way that the drive power required during operation is substantially reduced. Furthermore, the Scherenhubvorrichtung should be designed customizable with little effort to different applications.

Diese Aufgabe wird erfindungsgemäß mit einer Scherenhubvorrichtung gemäß den Merkmalen des Anspruchs 1 gelöst. Die Unteransprüche betreffen besonders zweckmäßige Weiterbildungen der Erfindung.This object is achieved with a scissor lift according to the features of claim 1. The subclaims relate to particularly expedient developments of the invention.

Erfindungsgemäß weist also die Scherenhubvorrichtung zwei beiderseits der Schwenkachse angeordnete Koppelbrücken auf, wobei die erste Koppelbrücke mit zumindest einer Umlenkrolle und die zweite Koppelbrücke mit einer Fixierung für das Zugmittel ausgestattet ist. Hierdurch wird es erstmals möglich, die Hubkraft nicht mittels der Spreizwirkung eines Spreizkörpers einzuleiten, sondern durch die Einstellung des Abstandes zwischen der mit beiden Scherengliedern verbundenen Koppelbrücke und der Scherenhubvorrichtung, beispielsweise der Schwenkachse, an welcher das freie Ende des Zugmittels fixiert ist. Hierzu ist die Koppelbrücke mit der Umlenkrolle ausgestattet, so dass durch Aufbringen der Zugkraft der Abstand und dadurch zugleich die Hubhöhe mit geringem Aufwand verändert werden. Aufgrund der dadurch realisierbaren günstigen Hebelverhältnisse wird die von dem Antrieb aufzubringende Spitzenlast, insbesondere beim Anheben aus der abgesenkten Ruhelage, wesentlich vermindert. Dadurch bedingt ist zugleich auch ein wesentlich geringerer Verschleiß, weil die Umlenkung des Zugmittels lediglich sehr geringen Reibungsverlusten unterliegt. Weiterhin zeigt es sich, dass aufgrund der geänderten Krafteinleitung ein nahezu konstantes Verhältnis zwischen der Differenzlänge des Zugmittels und der Differenz der Hubhöhe realisierbar ist, wodurch der Steuerungsaufwand erheblich reduziert ist. Außerdem gestattet die Scherenhubvorrichtung eine einfache Anpassung an unterschiedliche Einsatzbedingengen, indem bei größeren Lastanforderungen lediglich das Zugmittel ausgetauscht werden muss. Umständliche Neukonstruktionen können so in vielen Fällen vermieden werden. Zugleich wird eine erheblich gleichmäßigere Krafteinleitung in die Scherenglieder durch die beiden gegenüberliegenden Koppelbrücken mittels der jeweiligen Schubstreben erreicht und dadurch die Betriebssicherheit erhöht sowie zugleich die Belastung einzelner Schubstreben vermindert.Thus, according to the invention, the scissor lift device has two coupling bridges arranged on both sides of the pivot axis, wherein the first coupling bridge is equipped with at least one deflection roller and the second coupling bridge is provided with a fixation for the traction means. This makes it possible for the first time not to initiate the lifting force by means of the spreading action of an expansion body, but by adjusting the distance between the coupling bridge connected to both scissor links and the scissor lift device, for example, the pivot axis to which the free end of the traction means is fixed. For this purpose, the coupling bridge is equipped with the deflection roller, so that by applying the tensile force of the distance and thereby at the same time the lifting height can be changed with little effort. Due to the leverages that can be realized in this way, the peak load to be applied by the drive, in particular when lifting from the lowered rest position, is substantially reduced. As a result, at the same time also a significantly lower wear, because the deflection of the traction means is subject to only very low friction losses. Furthermore, it is found that due to the changed force introduction, a nearly constant ratio between the differential length of the traction means and the difference in the lifting height can be realized, whereby the control effort is considerably reduced. In addition, the scissor lift allows a simple adaptation to different Einsatzbedingengen by only the traction means must be replaced with larger load requirements. Cumbersome redesigns can be avoided in many cases. At the same time a considerably uniform force is achieved in the scissor members by the two opposite coupling bridges by means of the respective thrust struts, thereby increasing the reliability and at the same time reduces the burden of individual thrust struts.

Eine besonders vorteilhafte Weiterbildung wird auch dadurch realisiert, dass die Schwenkachse und die Koppelbrücken in einer gemeinsamen, insbesondere horizontalen, Ebene angeordnet sind. Hierdurch wird eine gleichförmige Hubbewegung erreicht und zugleich Schwankungen der erforderlichen Antriebsleistungen zwischen den Extremlagen der Scherenhubvorrichtung verringert.A particularly advantageous development is also realized in that the pivot axis and the coupling bridges are arranged in a common, in particular horizontal, plane. As a result, a uniform lifting movement is achieved while reducing fluctuations in the required drive power between the extreme positions of the scissor lift.

Erhöhte Lastanforderungen könnten durch eine geänderte Antriebsleistung erfüllt werden. Besonders einfach ist hingegen eine Abwandlung der vorliegenden Erfindung, bei welcher das Zugmittel zwischen den beiden Koppelbrücken mehrfach mittels mehrerer an den beiden Koppelbrücken angeordneten Umlenkrollen in mehreren Bahnen hin und her geführt ist. Hierdurch lässt sich mit jeder zusätzlichen Bahn die erforderliche Zugkraft und daher die Antriebsleistung reduzieren bzw. die maximale Tragkraft der Scherenhubvorrichtung erhöhen. Zugleich wird die dabei auf das Zugmittel wirkende Zugkraft vermindert. Die Tragkraft kann daher mit geringem Aufwand an die jeweiligen Einsatzbedingungen auch bei bereits vorhandenen Scherenhubvorrichtungen verändert werden.Increased load requirements could be met by a changed drive power. In contrast, a modification of the present invention is particularly simple, in which the traction means between the two coupling bridges is repeatedly guided back and forth in several paths by means of a plurality of deflection rollers arranged on the two coupling bridges. As a result, with each additional track, the required tractive force and therefore the drive power can be reduced or the maximum load capacity of the scissor lift device can be increased. At the same time the tensile force acting on the traction means is reduced. The carrying capacity can therefore be changed with little effort to the particular conditions of use even with existing Scherenhubvorrichtungen.

Die insbesondere parallel zueinander geführten Bahnen könnten in einer gemeinsamen horizontalen, insbesondere durch die Schwenkachse bestimmten Ebene nebeneinander liegen. Besonders zweckmäßig ist es jedoch, wenn die Bahnen des Zugmittels übereinander angeordnet sind. Hierdurch erfolgt die Umlenkung des Zugmittels auch bei einem ortsfest außerhalb der Scherenhubvorrichtung positionierten Antrieb für das Zugmittel ausschließlich in einer Ebene. Die dadurch auf das Zugmittel wirkende Belastung sowie auftretende Verschleißerscheinungen sind dadurch wesentlich verringert.The in particular parallel to each other guided webs could be in a common horizontal, in particular determined by the pivot axis level next to each other. It is particularly useful, however, if the tracks of the traction means are arranged one above the other. As a result, the deflection of the traction means takes place even in a stationary outside of the scissor lift device positioned drive for the traction means exclusively in one plane. The thus acting on the traction load and any signs of wear are significantly reduced.

Als besonders vorteilhaft erweist sich auch eine Ausgestaltung der erfindungsgemäßen Scherenhubvorrichtung, bei der die Schubstreben einen übereinstimmenden Abstand zwischen der Koppelbrücke und dem jeweils zugeordneten Scherenglied aufweisen. Hierdurch ist die Orientierung der Koppelbrücke, ähnlich dem Prinzip der Parallelgrammführung, unbeeinflusst von der jeweils von der Hubhöhe abhängigen Raumposition. Die Bahnführung des Zugmittels ist daher konstant über die gesamte Hubhöhe.An embodiment of the scissor lift device according to the invention, in which the push struts have a matching distance between the coupling bridge and the respective associated scissor link, has proven to be particularly advantageous. As a result, the orientation of the coupling bridge, similar to the principle of Parallelgrammführung, unaffected by each dependent on the lifting height spatial position. The web guide of the traction means is therefore constant over the entire lifting height.

Weiterhin wird eine besonders Erfolg versprechende Weiterbildung der Erfindung auch dadurch geschaffen, dass mehrere parallel zueinander angeordnete Zugmittel die Umlenkrolle gegenläufig umschlingen. Hierdurch werden die aufgrund der in mehreren Bahnen geführten Zugmittel eingeleiteten Momente durch die gegenläufige Anordnung benachbarter Bahnen gegeneinander aufgehoben. Die parallel geführten Zugmittel können dabei sowohl an einer gemeinsamen Umlenkrolle als auch an einzelnen, insbesondere zueinander koaxialen, Umlenkrollen geführt sein.Furthermore, a particularly promising development of the invention is also created in that a plurality of mutually parallel traction means wrap around the pulley in opposite directions. As a result, the introduced due to the traction means guided in multiple tracks are canceled by the opposite arrangement of adjacent tracks against each other. The parallel guided traction means can be performed both on a common deflection roller as well as on individual, in particular coaxial, pulleys.

Das Zugmittel kann beispielsweise als Kunststoff- oder Drahtseil, als Kette oder als Keil- oder Zahnriemen ausgeführt sein. Besonders praxisnah ist hingegen eine Ausgestaltung, bei der das Zugmittel zumindest abschnittsweise als ein Gurtband ausgeführt ist. Das Gurtband vereinigt eine hohe Flexibilität und Zugbelastbarkeit und erfordert zudem keine Schmiermittel. Weiterhin ist das Gurtband ohne störende Betriebsgeräusche einsetzbar und gestattet eine flache Gesamtbauhöhe.The traction means may be designed, for example, as a plastic or wire rope, as a chain or as a wedge or toothed belt. In contrast, a design in which the traction means is designed at least in sections as a belt is particularly practical. The webbing combines high flexibility and tensile strength and also requires no lubricant. Furthermore, the webbing can be used without disturbing operating noise and allows a flat overall height.

Eine besonders vielseitig einsetzbare Ausgestaltung der Erfindung wird auch dadurch erreicht, dass die Scherenhubvorrichtung mittels weiterer paarweise angeordneter Scherenglieder modular erweiterbar ist. Hierdurch können mit geringem Aufwand Doppel- oder Tandemkonstruktionen realisiert werden, die durch ein einziges gemeinsames Zugmittel betätigt werden können. Ein nach dem Stand der Technik erforderlicher Steuerungsaufwand für einen synchronen Bewegungsablauf entfällt somit. Sofern mehrere Zugmittel eingesetzt werden, können diese nach einer weiteren vorteilhaften Ausgestaltung insbesondere mittels eines gemeinsamen Antriebes betätigbar sein.A particularly versatile embodiment of the invention is also achieved in that the scissor lift device is modularly expandable by means of further paired scissor members. As a result, double or tandem constructions can be realized with little effort, which can be actuated by a single common traction means. A required according to the prior art control effort for a synchronous movement thus eliminated. If several traction means are used, they can be actuated according to a further advantageous embodiment, in particular by means of a common drive.

Eine andere besonders Erfolg versprechende Ausführungsform der vorliegenden Erfindung wird dadurch erreicht, dass die beiden Koppelbrücken mittels eines zur Anpassung an unterschiedliche Hubhöhen stufenlos längenveränderlichen Führungselementes miteinander verbunden sind. Dieses insbesondere teleskopisierbar ausgeführte Führungselement begrenzt die relative Beweglichkeit der beiden Koppelbrücke zueinander auf lediglich einen Freiheitsgrad, so dass ausschließlich der Abstand der beiden Koppelbrücken variabel ist. Die Orientierung der Koppelbrücken ist somit unveränderlich.Another particularly promising embodiment of the present invention is achieved in that the two coupling bridges are connected to one another by means of a continuously variable length to adapt to different lifting heights guide element. This particular telescopically executed guide element limits the relative mobility of the two coupling bridge to each other to only one degree of freedom, so that only the distance between the two coupling bridges is variable. The orientation of the coupling bridges is thus unchangeable.

Hierbei ist es besonders zweckmäßig, wenn das Führungselement als Dämpfer oder Notstellglied ausgeführt ist, um so bei einer plötzlichen Zugentlastung ein unbeabsichtigtes Absenken der Hubvorrichtung zu vermeiden. Im gewöhnlichen Betrieb ermöglicht das beispielsweise mit einem Hydraulikzylinder ausgestattete Führungselement eine Dämpfung bei Lastwechseln.It is particularly expedient if the guide element is designed as a damper or emergency actuator, so as to avoid inadvertent lowering of the lifting device in a sudden strain relief. In normal operation, for example, equipped with a hydraulic cylinder guide element allows damping during load changes.

Der Antrieb kann räumlich getrennt von der Scherenhubvorrichtung ortsfest angeordnet werden. Besonders kompakt ist jedoch auch eine Ausgestaltung, wenn der Antrieb an der Koppelbrücke in einer durch die Gelenke der Schubstreben und der Schwenkachse bestimmten Ebene angeordnet ist. Mehrere Antriebe können jeweils einer Koppelbrücke zugeordnet und einander gegenüberliegend angeordnet sein.The drive can be arranged spatially separated from the scissor lift stationary. However, an embodiment is particularly compact if the drive is arranged on the coupling bridge in a plane determined by the joints of the push rods and the pivot axis. Several drives can each be assigned to a coupling bridge and arranged opposite each other.

Weiterhin wird eine besonders Erfolg versprechende Weiterbildung der erfindungsgemäßen Scherenhubvorrichtung dann erreicht, wenn der Antrieb mit einer Wickeltrommel für das Zugmittel verbunden ist, deren insbesondere durch die Anzahl der Wicklungen bestimmter Wickeldurchmesser in Abhängigkeit von der Materialsstärke des Zugmittels derart bestimmt ist, dass eine konstante Drehzahl der Wickeltrommel zu einer konstanten Änderung der Hubhöhe der Scherenhubvorrichtung führt, um so ohne eine Drehzahlsteuerung eine gleichförmige Hubbewegung realisieren zu können.Furthermore, a particularly promising development of Scherenhubvorrichtung invention is achieved when the drive is connected to a winding drum for the traction means whose particular determined by the number of windings specific winding diameter depending on the material thickness of the traction means such that a constant speed of Winding drum leads to a constant change in the lifting height of the scissor lift, so as to be able to realize a uniform lifting movement without a speed control.

Die Erfindung lässt verschiedene Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt in

Fig.1
eine Seitenansicht einer erfindungsgemäßen Scherenhubvorrichtung;
Fig.2
eine Detailansicht der in Figur 1 gezeigten Scherenhubvorrichtung;
Fig.3
eine vergrößerte Detailansicht der in Figur 1 gezeigten Scherenhubvorrichtung in einer abgesenkten Position;
Fig. 4
eine abgewandelte Ausführungsform der in Figur 1 gezeigten Scherenhubvorrichtung.
The invention allows for various embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. This shows in
Fig.1
a side view of a scissor lift according to the invention;
Fig.2
a detailed view of the scissor lift shown in Figure 1;
Figure 3
an enlarged detail view of the scissor lift shown in Figure 1 in a lowered position;
Fig. 4
a modified embodiment of the scissor lift shown in Figure 1.

Figur 1 zeigt eine erfindungsgemäße Scherenhubvorrichtung 1 in einer Seitenansicht. Die Scherenhubvorrichtung 1 hat zwei unterhalb einer Hubebene 2 angeordnete und paarweise durch eine Schwenkachse 3 verbundene Scherenglieder 4, 5, wobei die Schwenkachse3 in der Mitte zwischen den jeweiligen einerseits die Hubebene 2 tragenden Endabschnitten 6, 7, anderseits auf einer Bodenfläche 8 aufliegenden Endabschnitten 9, 10 der Scherenglieder 4, 5 angeordnet ist. Die Scherenhubvorrichtung 1 ist mit einem ortsfest an der Bodenfläche 8 angeordneten Antrieb 11 ausgestattet, auf dessen Wickeltrommel 12 ein als Gurtband ausgeführtes Zugmittel 13 zum Aufrichten und Absenken der Scherenglieder 4, 5 ausgestattet ist. Hierzu ist die Scherenhubvorrichtung 1 mit zwei beiderseits der Schwenkachse 3 angeordneten, zueinander parallelen, Koppelbrücken 14, 15 ausgestattet, wobei die erste Koppelbrücke 14 mit zumindest zwei Umlenkrollen 16 und die zweite Koppelbrücke 15 mit einer Umlenkrolle 16 sowie einer Fixierung 17 für das Zugmittel 13 ausgestattet ist, so dass das Zugmittel 13 in mehreren Bahnen 18, 19, 20, 21 übereinander geführt ist. Die beiden Koppelbrücken 14, 15 stützen sich jeweils durch zwei baugleiche Schubstreben 22, 23 an den Scherengliedern 4, 5 schwenkbeweglich ab. Durch die Einleitung einer Zugkraft F mittels des Zugmittels 13 ist der Abstand a der Koppelbrücken 14, 15 veränderbar, so dass die Hubhöhe h in gewünschter Weise erreicht werden kann. Ergänzend sind die Koppelbrücken 14, 15 durch ein als Dämpfer wirkendes, insbesondere durch einen Zylinder realisiertes, Führungselement 24 verbunden, so dass Lastwechsel nicht zu unerwünscht hohen Spitzenlasten führen.FIG. 1 shows a scissor lift device 1 according to the invention in a side view. The scissor lift device 1 has two scissor members 4, 5 arranged below a lifting plane 2 and connected in pairs by a pivot axis 3, wherein the pivot axis 3 lies in the middle between the respective end sections 6, 7 carrying the lifting plane 2, and end sections 9 resting on a bottom surface 8, 10 of the scissor members 4, 5 is arranged. The scissor lift device 1 is equipped with a fixedly arranged on the bottom surface 8 drive 11, on its winding drum 12 designed as a belt tension means 13 for raising and lowering the scissor members 4, 5 is equipped. For this purpose, the scissor lift device 1 with two on both sides of the pivot axis 3 arranged parallel to each other, coupling bridges 14, 15 equipped, the first coupling bridge 14 with at least two pulleys 16 and the second coupling bridge 15 with a guide roller 16 and a fixing 17 for the traction means 13 equipped is, so that the traction means 13 in several tracks 18, 19, 20, 21 is guided over each other. The two coupling bridges 14, 15 are each supported by two identical push rods 22, 23 on the scissor members 4, 5 pivotally. By introducing a tensile force F by means of the traction means 13, the distance a of the coupling bridges 14, 15 is variable, so that the lifting height h can be achieved in the desired manner. In addition, the coupling bridges 14, 15 are connected by an acting as a damper, in particular realized by a cylinder, guide member 24 so that load changes do not lead to undesirably high peak loads.

Ergänzend zeigt Figur 2 in einer Detailansicht der in Figur 1 gezeigten Scherenhubvorrichtung 1 ein in einer zur Darstellungsebene parallelen Ebene geführtes weiteres Zugmittel 25, welches von dem gemeinsamen Antrieb 11 betätigt wird. Im Gegensatz zu dem in Figur 1 gezeigten Verlauf der Bahnen 18, 19, 20, 21 des Zugmittels 13, umschlingt das weitere Zug mittel 25 die Umlenkrollen 16 gegenläufig. Hierdurch heben sich durch die Zugkraft F der Zugmittel 13, 25 eingeleitete Momente gegeneinander auf.In addition, FIG. 2 shows, in a detailed view of the scissor lifting device 1 shown in FIG. 1, a further traction means 25 which is guided in a plane parallel to the plane of representation and which is actuated by the common drive 11. In contrast to the course shown in Figure 1 of the tracks 18, 19, 20, 21 of the traction means 13, wraps around the other train means 25, the pulleys 16 in opposite directions. This lifted by the tensile force F of the traction means 13, 25 initiated moments against each other.

In Figur 3 ist eine vergrößerte Detailansicht der in Figur 1 gezeigten Scherenhubvorrichtung 1 in einer abgesenkte Position zu erkennen, in welcher die Koppelbrücken 14, 15 einen Abstand A aufweisen. Das Zugmittel 13 ist mittels eines an der zweiten Koppelbrücke 15 fixierten Führungsrollenpaares 26 geführt. Durch Umlenkung des Zugmittels 13 an zwei Führungsrollen 16 der ersten Koppelbrücke 14 und einer Umlenkrolle 16 der zweiten Koppelbrücke 15 sowie der Fixierung 17 des Zugmittels 13 an der zweiten Koppelbrücke 15 wird eine Vervielfachung der übertragbaren Kraft erreicht, so dass auch große Hubkräfte mit einem vergleichsweise geringen Aufwand realisiert werden können. Zugleich weichen die erforderlichen Zugkräfte in der dargestellten abgesenkten Position nur gering von der in Figur 1 gezeigten Betriebsposition ab, so dass bei einer konstanten Zugbewegung des Zugmittels 13 eine gleichförmige Hubbewegung erreicht wird.FIG. 3 shows an enlarged detail view of the scissor lifting device 1 shown in FIG. 1 in a lowered position, in which the coupling bridges 14, 15 have a distance A. The traction means 13 is guided by means of a fixed to the second coupling bridge 15 guide roller pair 26. By deflection of the traction means 13 on two guide rollers 16 of the first coupling bridge 14 and a guide roller 16 of the second coupling bridge 15 and the fixing 17 of the traction means 13 to the second coupling bridge 15, a multiplication of the transmittable force is achieved, so that even large lifting forces with a comparatively low Effort can be realized. At the same time, the required tensile forces in the illustrated lowered position only slightly deviate from the operating position shown in FIG. 1, so that a uniform stroke movement is achieved with a constant pulling movement of the traction mechanism 13.

Figur 4 zeigt die Scherenhubvorrichtung 1 in einer abgewandelten Form mit zwei unterhalb der Hubebene 2 durch die Schwenkachse 3 verbundenen Scherengliedern 4, 5 mit dem an der Bodenfläche 8 ortsfest angeordneten Antrieb 11, an dessen Wickeltrommel 12 das Zugmittel 13 zum Aufrichten und Absenken der Scherenglieder 4, 5 fixiert ist. Die Scherenhubvorrichtung 1 hat bei dieser Ausführung lediglich eine einzige seitlich der Schwenkachse 3 angeordnete Koppelbrücke 14, die mehrere Umlenkrollen 16 trägt. Die Fixierung 17 für das Zugmittel 13 ist dabei mit der Schwenkachse 3 in einer gemeinsamen vertikalen Ebene verbunden, so dass das Zugmittel 13 in mehreren Bahnen 18, 19, 20, 21 übereinander geführt ist. Die Koppelbrücke 14 stützt sich durch zwei baugleiche Schubstreben 22, 23 an den Scherengliedern 4, 5 schwenkbeweglich ab. Durch die Einleitung einer Zugkraft F mittels des Zugmittels 13 ist der Abstand a der Koppelbrücke 14 von der Schwenkachse 3 veränderbar, so dass die Hubhöhe h in gewünschter Weise eingestellt werden kann. Zur Stabilisierung ist die Koppelbrücke 14 durch das Führungselement 24 mit der Schwenkachse 3 verbunden, so dass eine im Wesentlichen vertikale Ausrichtung der Koppelbrücke 14 bei unterschiedlichen Hubhöhen h gewährleistet ist.FIG. 4 shows the scissor lift device 1 in a modified form with two scissor members 4, 5 connected below the lifting plane 2 by means of the stationary drive 11 arranged on the bottom surface 8, on the winding drum 12 of which the pulling means 13 for erecting and lowering the scissor members 4 , 5 is fixed. The scissor lift device 1 has in this embodiment, only a single side of the pivot axis 3 arranged coupling bridge 14, which carries a plurality of deflection rollers 16. The fixation 17 for the traction means 13 is connected to the pivot axis 3 in a common vertical plane, so that the traction means 13 in several tracks 18, 19, 20, 21 is guided one above the other. The coupling bridge 14 is supported by two identical push rods 22, 23 on the scissor members 4, 5 pivotally. By introducing a tensile force F by means of the traction means 13, the distance a of the coupling bridge 14 from the pivot axis 3 is variable, so that the lifting height h can be set in the desired manner. To stabilize the coupling bridge 14 is connected by the guide member 24 with the pivot axis 3, so that a substantially vertical orientation of the coupling bridge 14 is guaranteed at different heights h.

Claims (13)

  1. Scissor lift device (1) comprising at least two scissor elements (4, 5) connected in pairs by a swivel axis (3), said swivel axis (3) being positioned between the respective end portions (6, 7, 8, 9) of the scissor elements (4, 5), and comprising a drive (11) for raising and lowering the scissor elements (4, 5) by a traction means (13, 25) comprising at least one coupling bridge (14, 15) with two thrust struts (22, 23) which are positioned in a pivotally movable manner and are each connected in a pivotally movable manner to a scissor element (4, 5), the coupling bridge (14, 15) supporting a reversing roller (16) for the traction means (13, 25) secured to the scissor lift device (1), characterised in that said scissor lift device (1) comprises two coupling bridges (14, 15) positioned on both sides of the swivel axis (3), the first coupling bridge (14) being provided with at least one reversing roller (16) and the second coupling bridge (15) being provided with a fixing device (17) for the traction means (13, 25).
  2. Scissor lift device (1) according to claim 1, characterised in that the swivel axis (3) and the coupling bridges (14, 15) are located in a common plane, in particular a horizontal plane.
  3. Scissor lift device (1) according to claim 2, characterised in that the traction means (13, 25) is guided along a plurality of paths (18, 19, 20, 21) between the two coupling bridges (14, 15) by means of a plurality of reversing rollers (16) positioned on the two coupling bridges (14, 15).
  4. Scissor lift device (1) according to claim 3, characterised in that the paths (18, 19, 20, 21) of the traction means (13, 25) are arranged one above the other.
  5. Scissor lift device (1) according to at least one of the preceding claims, characterised in that the thrust struts (22, 23) define equal spacings between the coupling bridge (14, 15) and the respectively associated scissor element (4, 5).
  6. Scissor lift device (1) according to at least one of the preceding claims, characterised in that a plurality of traction means (13, 25) arranged parallel to one another wrap around the reversing roller (16) in opposite directions.
  7. Scissor lift device (1) according to at least one of the preceding claims, characterised in that at least a portion of the traction means (13, 25) is configured as a flat belt.
  8. Scissor lift device (1) according to at least one of the preceding claims, characterised in that said scissor lift device (1) may be expanded in a modular manner by other scissor elements (4, 5) arranged in pairs.
  9. Scissor lift device (1) according to at least one of the preceding claims, characterised in that said scissor lift device (1) comprises a plurality of traction means (13, 25) which may be actuated in particular by a common drive (11).
  10. Scissor lift device (1) according to at least one of the preceding claims, characterised in that the two coupling bridges (14, 15) are interconnected by a guide element (24) which is continuously adjustable in length to adapt to different lift heights (h).
  11. Scissor lift device (1) according to claim 10, characterised in that the guide element (24) is configured as a damping element and/or an emergency regulating unit.
  12. Scissor lift device (1) according to at least one of the preceding claims, characterised in that the drive (11) is positioned on the coupling bridge (14, 15).
  13. Scissor lift device (1) according to at least one of the preceding claims, characterised in that the drive (11) is connected to a winding drum (12) for the traction means (13, 25) and the winding diameter of the drum is determined as a function of the material thickness of the traction means (13, 25) such that a constant rotational speed of the winding drum (12) leads to a constant change in the lift height (h) of the scissor lift device (1).
EP03004756A 2003-03-04 2003-03-04 Scissor lift device Expired - Lifetime EP1454873B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE50305742T DE50305742D1 (en) 2003-03-04 2003-03-04 scissor lift
AT03004756T ATE346011T1 (en) 2003-03-04 2003-03-04 SCISSOR LIFT DEVICE
EP03004756A EP1454873B1 (en) 2003-03-04 2003-03-04 Scissor lift device
US10/792,283 US7213686B2 (en) 2003-03-04 2004-03-04 Scissor lift mechanism
CNB2004100074726A CN1315717C (en) 2003-03-04 2004-03-04 Scissors type lifting equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03004756A EP1454873B1 (en) 2003-03-04 2003-03-04 Scissor lift device

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EP1454873A1 EP1454873A1 (en) 2004-09-08
EP1454873B1 true EP1454873B1 (en) 2006-11-22

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US (1) US7213686B2 (en)
EP (1) EP1454873B1 (en)
CN (1) CN1315717C (en)
AT (1) ATE346011T1 (en)
DE (1) DE50305742D1 (en)

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DE202012003063U1 (en) 2012-03-27 2012-04-11 Rofa Gmbh Scissor
EP2644560A1 (en) 2012-03-27 2013-10-02 Rofa Industrial Automation AG Scissor type lifting table
DE102012006028A1 (en) 2012-03-27 2013-10-02 Rofa Industrial Automation Ag Scissor
US9340398B2 (en) 2012-03-27 2016-05-17 Rofa Industrial Automation Ag Scissor lift table
DE202013100340U1 (en) 2012-07-13 2013-02-08 Rofa Industrial Automation Ag Hubtischsteuerung
EP2684834A1 (en) 2012-07-13 2014-01-15 Rofa Industrial Automation AG Lifting table control
EP3476792A1 (en) 2017-10-25 2019-05-01 Flexlift Hubgeräte GmbH Scissors lift
DE102021206534A1 (en) 2021-06-24 2022-12-29 Robert Bosch Gesellschaft mit beschränkter Haftung lift transverse unit

Also Published As

Publication number Publication date
US20040251453A1 (en) 2004-12-16
DE50305742D1 (en) 2007-01-04
EP1454873A1 (en) 2004-09-08
CN1315717C (en) 2007-05-16
US7213686B2 (en) 2007-05-08
ATE346011T1 (en) 2006-12-15
CN1526634A (en) 2004-09-08

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