EP0854110A1 - Scissors lift system for working platforms - Google Patents

Scissors lift system for working platforms Download PDF

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Publication number
EP0854110A1
EP0854110A1 EP97122979A EP97122979A EP0854110A1 EP 0854110 A1 EP0854110 A1 EP 0854110A1 EP 97122979 A EP97122979 A EP 97122979A EP 97122979 A EP97122979 A EP 97122979A EP 0854110 A1 EP0854110 A1 EP 0854110A1
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EP
European Patent Office
Prior art keywords
scissor
scissors
arms
lifting
auxiliary
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Granted
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EP97122979A
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German (de)
French (fr)
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EP0854110B1 (en
Inventor
Dirk Begemann
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GSL GERMAN STANDARD LIFT GMBH
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Dirk Begemann
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F11/00Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/042Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers

Definitions

  • the invention relates to a scissor lift system for work platforms with a plurality of the same, arranged one above the other Scissor packs, each consisting of an outside Pair of scissors arms and a cross between them Scissor arm exist at the intersection with the Pair of scissor arms over an axis transverse to the stroke direction is articulated, with the scissor arms at the upper ends the lower ends of the respective lower scissors package the scissor arms of the respective scissors package above are articulated and there is at least one lifting cylinder, the in the area of the scissors package below its axis of action at an acute angle on the inside Scissor arm attacks and is mounted on the frame.
  • scissor scaffolds for work platforms at which are also inside scissor arm pairs, whose Scissor arms are spaced from each other, already started between the inner scissor arms another one above the lower lifting cylinder To provide lifting cylinders.
  • a scissor lift system of the generic type kind of this is however not possible because this is a so-called triple system, in which a pair of scissors from an outer pair of scissor arms and an intersecting individual Scissor arm exists, these three scissor arms in the Projection of the stroke direction seen closely arranged are.
  • the invention has for its object a scissor lifting system to create for work platforms of the type mentioned at the beginning, at the initial upright and at low Raising heights of the lifting cylinders and the lower scissor packs be relieved.
  • This task is done with a scissor lift system for work platforms of the generic type according to the invention solved that at least one auxiliary cylinder in the stroke direction between two articulation points spreading apart at the stroke is arranged.
  • the usual vertical Erection of the scissor lift of the auxiliary cylinders also acts in this vertical direction, in the first place with less erection far less lifting forces than be applied over the inclined lifting cylinder have to. So even with relatively small auxiliary staff both the lifting cylinder and the lower scissor arms effective relief of the scissor lift, which also reduces the size of the lifting cylinder can. It is understood that the lifting cylinder and the auxiliary cylinder can be controlled synchronously, which is precisely what the first force when lifting the scissor lift important from its lower end position. So it can new scissor mast with six or more on top of each other arranged scissors packages are executed.
  • Such a lifting cylinder can be located underneath Scissors pack can be arranged instead or in addition can also be on the outside of the scissor lift, in particular Auxiliary cylinder between scissors packages further up be provided.
  • Auxiliary cylinder between scissors packages further up be provided.
  • auxiliary cylinder the erection of the scissor mast over the entire Support Aufrichtweg. Because with increasing The ones to be brought up by the lifting cylinder take uprightness Forces that alone in a certain elevation is able to use the forces for the further erection of the Apply scissor mast.
  • Telescopic cylinder can be used for a smaller auxiliary cylinder than the maximum stroke between each other Lay out spreading articulation points on the scissor mast, whereby then the cylinder tube or the piston rod of the concerned Auxiliary cylinder with one of its two articulation points is loosely connected in the stroke direction.
  • Fig. 1 shows in detail a chassis 1 with a support frame 2, on which a scissor lift 3 is arranged.
  • the scissor lift has a work platform at the top 4, between the lower end position and the upper, erected end position of the scissor lift 3 height adjustable is.
  • the scissor lift 3 consists of superimposed, same scissor packs 5, each of pairs of scissor arms 6 with outer scissor arms 7 and inner ones Scissor arms 8 exist.
  • the scissor arms 7 of each pair of scissor arms 6 are congruent seen in the transverse direction to each other and are just such a distance that in between with sufficient play the inner scissor arms 8 are arranged. This results in a scissor lift 3 so-called three-way system, as one particularly in the End view of Fig. 2 sees.
  • the lower ends 9 of the outside Scissor arms 7 of the scissor arm pairs 6 are each articulated with the top ends 10 of the interior Scissor arms 8 are connected, as are 11 at the upper ends the outer scissor arms 7 in between the lower ends 12 of the inner scissor arms 8 articulated.
  • Each half the length of the outer scissor arms 7 are Scissor arm pairs 6 and the inner scissor arms 8 one Scissors package 5 at intersections 13 by means of a inserted axis or the like articulated with each other coupled. How, among other things, at the number of these crossing points 13 recognizes, it is the scissor lift 3 for one that has a total of six Scissor packages 5 is equipped.
  • the main drive for erecting and lowering the scissor lift 3 takes place via a lifting cylinder 14 which on Chassis 1 or support frame 2 at a pivot point 15 in Seen transversely in the middle under the scissor lift 3 is arranged and with its piston rod at a bearing point 16 on the underside of the scissor arm at the bottom 8 attacks.
  • the effective axis of the lifting cylinder 14 takes a very acute angle to this lower, inner one Scissor arm 8, which on the one hand saves overall height, but on the other hand increased lifting forces when lifting the scissor lift 3 required from the lower end position.
  • auxiliary cylinder 17 In the middle under the scissor lift 3 is on the support frame 2 an auxiliary cylinder 17 arranged there at a pivot point 18 is suspended. With its piston rod the auxiliary cylinder 17 engages at an upper articulation point 19 at the bottom of the lowest, inner Scissor arm 8 is located.
  • the direction of action of Auxiliary cylinder 17 lies in the lifting direction of the scissor lift 3, usually in the vertical direction.
  • In order to the direction of action of the auxiliary cylinder 17 is exactly in arranged in the vertical plane in which the hub of the scissor mast 3 crossing points spread apart 13 lie. Unlike the lifting cylinder 14, the only with its smaller force component in the lower one Starting position on the scissor lift 3 attacks, the full effect Force of the auxiliary cylinder 17 in the vertical stroke direction.
  • the auxiliary cylinder 17 supports the initial stroke the scissor lift 3 from its lowered Lay out, and there with increasing righting angle Scissor arms 7, 8 the vertical force component of the lifting cylinder 14 increases, it can rise above a certain level the scissor lift 3 alone the other lifting forces up to the upper end position of the erected scissor lift 3 apply. Therefore it is sufficient if the Auxiliary cylinder 17 only over the initial stroke of the scissor lift 3 is effective, with which the auxiliary cylinder 17th Overall length can be saved.
  • auxiliary cylinders 21 are on the outer sides of the outer Scissor arms 7 of the relevant scissor arm pairs 6 are arranged.
  • These auxiliary cylinders 21 have the same vertical direction of action as the auxiliary cylinder 17, their lower Articulation points 24 are located at the intersection points 13 of the lower pair of scissors 5, while the upper articulation points 23 of the auxiliary cylinder 21 in the area of the crossing points of the upper scissors package 5 are.
  • the piston rods 22 of these auxiliary cylinders 21 also have one Safety gear 25 so that the loose link 23 itself of this from a certain upright height when lifting further can take off. With reverse direction of movement This also ensures that the articulation point 23 again securely in engagement with the respective piston rod 22 of the relevant auxiliary cylinder 21 comes.
  • the two auxiliary cylinders 21 are in the embodiment mirror-symmetrical to each other at the same height of the scissor lift 3 arranged, which is not absolutely necessary is. Basically, both the top auxiliary cylinders 21 and the lower auxiliary cylinder 17 from the in Height direction transverse center plane offset are arranged, the only decisive thing is that the articulation points 18 and 19 for the lower auxiliary cylinder 17 and the articulation points 23 and 24 for the upper auxiliary cylinders 21 itself when erecting the scissor lift 3 in the height direction separate from each other.
  • upper auxiliary cylinder 21 also on the Ends of the scissor arms 7, 8 are provided because themselves there also articulation points with one through the scissor arm ends passed axis are at the corresponding Extension over the outer sides of the outer scissor arms 7 can also be used for the articulation of the auxiliary cylinder 21 can.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Harvester Elements (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Sewing Machines And Sewing (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

Each stack (5) of scissors consists of an outer pair of scissors arms (7), intersected by a scissors arm joined to the intersection point (13) by an axle crosswise to the lifting direction. The underneath ends (9) of the scissors arms of the scissors stack above it are attached to the top ends (10) of the scissors arms (8) of the scissors stack underneath. At least one lifting cylinder (14) has an effective axis touching the inner scissors arm at an acute angle, near the lowest scissors stack. At least one auxiliary cylinder (17,21) is positioned in the lifting direction between two link points (18,19,23,24) which are splayed apart during lifting.

Description

Die Erfindung bezieht sich auf ein Scherenhubsystem für Arbeitsbühnen mit einer Mehrzahl gleicher, übereinander angeordneter Scherenpakete, die jeweils aus einem außenliegenden Scherenarmpaar und einem dazwischen kreuzend angeordneten Scherenarm bestehen, der an der Kreuzungsstelle mit dem Scherenarmpaar über eine quer zur Hubrichtung liegende Achse gelenkig verbunden ist, wobei an den Oberenden der Scherenarme des jeweils unteren Scherenpaketes die Unterenden der Scherenarme des jeweils darüberliegenden Scherenpaketes angelenkt sind und zumindest ein Hubzylinder vorhanden ist, der im Bereich des zuunterst liegenden Scherenpaketes mit seiner Wirkachse unter einem spitzen Winkel am inneren Scherenarm angreift und gestellfest gegengelagert ist.The invention relates to a scissor lift system for work platforms with a plurality of the same, arranged one above the other Scissor packs, each consisting of an outside Pair of scissors arms and a cross between them Scissor arm exist at the intersection with the Pair of scissor arms over an axis transverse to the stroke direction is articulated, with the scissor arms at the upper ends the lower ends of the respective lower scissors package the scissor arms of the respective scissors package above are articulated and there is at least one lifting cylinder, the in the area of the scissors package below its axis of action at an acute angle on the inside Scissor arm attacks and is mounted on the frame.

Bei Scherenhubsystemen dieser Art strebt man immer größere Arbeitshöhen an, womit entsprechend die Anzahl der übereinander angeordneten Scherenpakete erhöht werden muß. Mit der Anzahl der Scherenpakete wachsen aber auch die Kräfte an, die vom Hubzylinder aufgebracht werden müssen, um das Scherengerüst aufzurichten. Weiter hat dies aufgrund des sich erhöhenden Gewichtes des Scherengerüstes zur Folge, daß beim Anheben in der abgesenkten Lage eine synchrone Aufrichtung der einzelnen Scherenpakete nicht vonstatten geht. Vielmehr deformieren sich zunächst die unteren Scherenpakete und in erster Linie das zuunterst liegende Scherenpaket, weil bei der üblichen Ausführung in Stahl sich deren Scherenarme elastisch verbiegen. Da mit zunehmendem Aufrichten die Hubkräfte kleiner werden, die von einem Scherenpaket zum nächst oberen übertragen werden, findet in gewissen Grenzen eine federelastische Aufrichtung des Scherengerüstes statt, die sich einer exakten Kontrolle entzieht, weswegen im unteren Aufrichtbereich bestimmte Arbeitshöhen nicht genau angefahren werden können. Vor allem macht sich das bei solchen Scherenhubgerüsten störend bemerkbar, die mehr als vier Scherenpakete haben.With scissor lifting systems of this type, one is always striving for larger ones Working heights, which corresponds to the number of superimposed ones arranged scissors packages must be increased. With the The number of scissor packs also increases, which must be applied by the lifting cylinder to the scissor-type structure to erect. This has further due to the increasing weight of the scissors structure that when lifting in the lowered position, a synchronous erection of the individual scissors packages does not take place. Rather, the lower packages of scissors deform first and primarily the scissors package at the bottom, because with the usual version in steel their scissor arms bend elastically. Because with increasing straightening the lifting forces become smaller than that of a scissors package to be transferred to the next upper, takes place in certain Limits a spring-elastic erection of the scissors-like structure instead, which eludes precise control, why certain working heights in the lower raising area cannot be approached exactly. Most of all makes up that is noticeable with such scissor lifts, the have more than four sets of scissors.

Man ist deshalb bei Scherengerüsten für Arbeitsbühnen, bei denen auch innenliegend Scherenarmpaare vorhanden sind, deren Scherenarme in Abstand voneinander angeordnet sind, schon dazu übergegangen, zwischen den innenliegenden Scherenarmen oberhalb des unteren Hubzylinders einen weiteren Hubzylinder vorzusehen. Bei einem Scherenhubsystem der gattungsbildenden Art ist dies jedoch nicht möglich, denn hierbei handelt es sich um ein sogenanntes Dreiersystem, bei dem ein Scherenpaket aus einem außenliegenden Scherenarmpaar und einem kreuzend dazwischenliegenden, einzelnen Scherenarm besteht, wobei diese drei Scherenarme in der Projektion der Hubrichtung gesehen dicht beieinander angeordnet sind. Folglich gibt es einen nutzbaren Zwischenraum zwischen den außenliegenden Scherenarmen bei einem solchen Dreiersystem nicht, und es kann hier lediglich unter dem zuunterst angeordneten, einzelnen Scherenarm der für die Aufrichtung des Scherengerüstes notwendige Hubzylinder angebracht werden. Dieser Hubzylinder schließt mit dem Scherenarm, an dem er angreift, einen sehr spitzen Winkel aus Raumgründen ein, der in der abgesenkten Endlage des Scherenhubgerüstes nur wenige Grad beträgt, wodurch für die anfängliche Hubbewegung die hohen Aufrichtkräfte bedingt sind. One is therefore with scissor scaffolds for work platforms, at which are also inside scissor arm pairs, whose Scissor arms are spaced from each other, already started between the inner scissor arms another one above the lower lifting cylinder To provide lifting cylinders. In a scissor lift system of the generic type Kind of this is however not possible because this is a so-called triple system, in which a pair of scissors from an outer pair of scissor arms and an intersecting individual Scissor arm exists, these three scissor arms in the Projection of the stroke direction seen closely arranged are. Hence there is a usable space between the outer scissor arms in such a case Triple system is not, and it can only here under the lowest arranged, single scissor arm for the The necessary lifting cylinders are attached to the scissor frame will. This lifting cylinder closes with the scissor arm, at which he attacks, a very acute angle Space constraints in the lowered end position of the scissor lift is just a few degrees, making for the initial Lifting movement causes the high erecting forces are.

Der Erfindung liegt die Aufgabe zugrunde, ein Scherenhubsystem für Arbeitsbühnen der eingangs genannten Art zu schaffen, bei dem beim anfänglichen Aufrichten und bei geringen Aufrichthöhen der Hubzylinder und die unteren Scherenpakete entlastet werden.The invention has for its object a scissor lifting system to create for work platforms of the type mentioned at the beginning, at the initial upright and at low Raising heights of the lifting cylinders and the lower scissor packs be relieved.

Diese Aufgabe wird bei einem Scherenhubsystem für Arbeitsbühnen der gattungsbildenden Art nach der Erfindung dadurch gelöst, daß wenigstens ein Hilfszylinder in der Hubrichtung zwischen zwei voneinander beim Hub spreizenden Anlenkstellen angeordnet ist.This task is done with a scissor lift system for work platforms of the generic type according to the invention solved that at least one auxiliary cylinder in the stroke direction between two articulation points spreading apart at the stroke is arranged.

Für die Erfindung ist wesentlich, daß bei üblicher vertikaler Aufrichtung des Scherenhubgerüstes der Hilfszylinder ebenfalls in dieser Vertikalrichtung wirkt, in der vor allem bei geringer Aufrichtung weit weniger Hubkräfte als über den schrägliegenden Hubzylinder aufgebracht werden müssen. So können schon mit verhältnismäßig geringen Hilfskräften sowohl der Hubzylinder als auch die unteren Scherenarme des Scherenhubgerüstes wirksam entlastet werden, womit auch die Baugröße des Hubzylinders reduziert werden kann. Es versteht sich, daß der Hubzylinder und der Hilfszylinder synchron angesteuert werden, was gerade auch für den ersten Krafteinsatz beim Anheben des Scherenhubgerüstes aus seiner unteren Endlage heraus wichtig ist. So kann das neue Scherenhubgerüst problemlos mit sechs und mehr übereinander angeordneten Scherenpaketen ausgeführt werden.It is essential for the invention that the usual vertical Erection of the scissor lift of the auxiliary cylinders also acts in this vertical direction, in the first place with less erection far less lifting forces than be applied over the inclined lifting cylinder have to. So even with relatively small auxiliary staff both the lifting cylinder and the lower scissor arms effective relief of the scissor lift, which also reduces the size of the lifting cylinder can. It is understood that the lifting cylinder and the auxiliary cylinder can be controlled synchronously, which is precisely what the first force when lifting the scissor lift important from its lower end position. So it can new scissor mast with six or more on top of each other arranged scissors packages are executed.

Ein solcher Hubzylinder kann unter dem zuunterst liegenden Scherenpaket angeordnet werden, statt dessen oder zusätzlich können auch außenseitig am Scherenhubgerüst, insbesondere zwischen weiter oben liegenden Scherenpaketen Hilfszylinder vorgesehen werden. Durch die an den oberen, außenliegenden Scherenarmen der Scherenpakete angeordneten Hilfszylinder werden vor allem bei anfänglichem oder geringem Aufrichten des Scherenhubgerüstes die weiter unten angeordneten Scherenpakete entlastet, womit die elastische Deformation des Scherenhubgerüstes erheblich verringert werden kann. Somit lassen sich mit dem neuen Scherenhubsystem geringe Aufrichthöhen exakt anfahren.Such a lifting cylinder can be located underneath Scissors pack can be arranged instead or in addition can also be on the outside of the scissor lift, in particular Auxiliary cylinder between scissors packages further up be provided. By the on the upper, outside Scissor arms of the scissor packs arranged Auxiliary cylinders are especially at initial or low Erect the scissor lift masts below Reliefs of scissors packages, making the elastic Deformation of the scissor mast significantly reduced can be. Thus, with the new scissor lift system Approach low erection heights exactly.

Grundsätzlich ist es nicht notwendig, mittels der Hilfszylinder die Aufrichtung des Scherenhubgerüstes über den gesamten Aufrichtweg zu unterstützen. Denn mit zunehmender Aufrichtung nehmen die vom Hubzylinder aufzubringenden Kräfte ab, der ab einer bestimmten Aufrichthöhe allein in der Lage ist, die Kräfte für die weitere Aufrichtung des Scherenhubgerüstes aufzubringen. Anstelle des Einsatzes von Teleskopzylinder kann man die Hilfszylinder für einen geringeren als den maximalen Hub zwischen den voneinander spreizenden Anlenkstellen am Scherenhubgerüst auslegen, wobei dann das Zylinderrohr oder die Kolbenstange des betreffenden Hilfszylinders mit einer seiner beiden Anlenkstellen in Hubrichtung lose verbunden ist. Ist der maximale Ausfahrweg der Hilfszylinder erreicht, kann über den Hubzylinder die weitere Aufrichtung des Scherenhubgerüstes vorgenommen werden, wobei sich dann diejenige Anlenkstelle, an der lediglich eine lose Verbindung zu dem Hilfszylinder besteht, von dessen Anlenkvorrichtung entfernt. Damit beim Absenken diese Anlenkstelle wieder den Kraftschluß mit dem betreffenden Hilfszylinder findet, ist daran oder an dem Hilfszylinder selbst eine Fangvorrichtung vorgesehen, die beim Absenken des Scherenhubgerüstes selbstätig den Eingriff zwischen der Anlenkstelle und dem Hilfszylinder herstellt.Basically, it is not necessary to use the auxiliary cylinder the erection of the scissor mast over the entire Support Aufrichtweg. Because with increasing The ones to be brought up by the lifting cylinder take uprightness Forces that alone in a certain elevation is able to use the forces for the further erection of the Apply scissor mast. Instead of using Telescopic cylinder can be used for a smaller auxiliary cylinder than the maximum stroke between each other Lay out spreading articulation points on the scissor mast, whereby then the cylinder tube or the piston rod of the concerned Auxiliary cylinder with one of its two articulation points is loosely connected in the stroke direction. Is the maximum extension path the auxiliary cylinder can be reached via the lifting cylinder the further erection of the scissor lift carried out be, where then the articulation point which is only a loose connection to the auxiliary cylinder, removed from its linkage. With that at Lower this articulation point again the adhesion with the finds the auxiliary cylinder concerned, is on or on the Auxiliary cylinder itself provided a safety gear that automatically engages when lowering the scissor lift between the articulation point and the auxiliary cylinder.

Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung ergeben sich im übrigen aus den Unteransprüchen.Further advantageous design features of the invention otherwise result from the subclaims.

Die Erfindung wird nachfolgend anhand der Zeichnung an einem Ausführungsbeispiel noch näher erläutert. Dabei zeigen:

Fig. 1
die Seitansicht eines eine Arbeitsbühne tragenden Scherenhubsystems und
Fig. 2
die Stirnansicht des Scherenhubsystems nach Figur 1.
The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. Show:
Fig. 1
the side view of a scissor lifting system carrying a working platform and
Fig. 2
the front view of the scissor lifting system according to Figure 1.

Fig. 1 zeigt im einzelnen ein Fahrgestell 1 mit einem Traggestell 2, auf dem ein Scherenhubgerüst 3 angeordnet ist. Am Oberende trägt das Scherenhubgerüst eine Arbeitsplattform 4, die zwischen der unteren Endlage und der oberen, aufgerichteten Endlage des Scherenhubgerüstes 3 höhenverfahrbar ist.Fig. 1 shows in detail a chassis 1 with a support frame 2, on which a scissor lift 3 is arranged. The scissor lift has a work platform at the top 4, between the lower end position and the upper, erected end position of the scissor lift 3 height adjustable is.

Das Scherenhubgerüst 3 besteht aus übereinander angeordneten, gleichen Scherenpaketen 5, die jeweils aus Scherenarmpaaren 6 mit außenliegenden Scherenarmen 7 und aus inneren Scherenarmen 8 bestehen. Die Scherenarme 7 jedes Scherenarmpaars 6 liegen in Querrichtung gesehen deckungsgleich zueinander und haben gerade einen solchen Abstand, daß dazwischen mit ausreichendem Spiel die inneren Scherenarme 8 angeordnet sind. Dies ergibt für das Scherenhubgerüst 3 ein sogenanntes Dreiersystem, wie man insbesondere in der Stirnansicht von Fig. 2 ersieht. Die Unterenden 9 der außenliegenden Scherenarme 7 der Scherenarmpaare 6 sind jeweils gelenkig mit den Oberenden 10 der innenliegenden Scherenarme 8 verbunden, ebenso sind an den Oberenden 11 der außenliegenden Scherenarme 7 dazwischenliegend die Unterenden 12 der inneren Scherenarme 8 angelenkt. Jeweils auf halber Länge sind die außenliegenden Scherenarme 7 der Scherenarmpaare 6 und die innenliegenden Scherenarme 8 eines Scherenpaketes 5 an Kreuzungsstellen 13 mittels einer durchgesteckten Achse oder dergleichen gelenkig miteinander gekuppelt. Wie man unter anderem an der Anzahl dieser Kreuzungsstellen 13 erkennt, handelt es sich bei dem Scherenhubgerüst 3 um ein solches, welches mit insgesamt sechs Scherenpaketen 5 ausgestattet ist.The scissor lift 3 consists of superimposed, same scissor packs 5, each of pairs of scissor arms 6 with outer scissor arms 7 and inner ones Scissor arms 8 exist. The scissor arms 7 of each pair of scissor arms 6 are congruent seen in the transverse direction to each other and are just such a distance that in between with sufficient play the inner scissor arms 8 are arranged. This results in a scissor lift 3 so-called three-way system, as one particularly in the End view of Fig. 2 sees. The lower ends 9 of the outside Scissor arms 7 of the scissor arm pairs 6 are each articulated with the top ends 10 of the interior Scissor arms 8 are connected, as are 11 at the upper ends the outer scissor arms 7 in between the lower ends 12 of the inner scissor arms 8 articulated. Each half the length of the outer scissor arms 7 are Scissor arm pairs 6 and the inner scissor arms 8 one Scissors package 5 at intersections 13 by means of a inserted axis or the like articulated with each other coupled. How, among other things, at the number of these crossing points 13 recognizes, it is the scissor lift 3 for one that has a total of six Scissor packages 5 is equipped.

Der Hauptantrieb für das Aufrichten und Absenken des Scherenhubgerüstes 3 erfolgt über einen Hubzylinder 14, der am Fahrgestell 1 oder Traggestell 2 an einem Anlenkpunkt 15 in Querrichtung gesehen mittig unter dem Scherenhubgerüst 3 angeordnet ist und mit seiner Kolbenstange an einem Lagerpunkt 16 an der Unterseite des zuunterst liegenden Scherenarms 8 angreift. Die Wirkachse des Hubzylinders 14 nimmt einen sehr spitzen Winkel zu diesem unteren, innenliegenden Scherenarm 8 ein, was einerseits Bauhöhe einspart, aber andererseits erhöhte Hubkräfte beim Anheben des Scherenhubgerüstes 3 aus der unteren Endlage erfordert.The main drive for erecting and lowering the scissor lift 3 takes place via a lifting cylinder 14 which on Chassis 1 or support frame 2 at a pivot point 15 in Seen transversely in the middle under the scissor lift 3 is arranged and with its piston rod at a bearing point 16 on the underside of the scissor arm at the bottom 8 attacks. The effective axis of the lifting cylinder 14 takes a very acute angle to this lower, inner one Scissor arm 8, which on the one hand saves overall height, but on the other hand increased lifting forces when lifting the scissor lift 3 required from the lower end position.

Mittig unter dem Scherenhubgerüst 3 ist am Traggestell 2 ein Hilfszylinder 17 angeordnet, der dort an einer Anlenkstelle 18 pendelnd aufgehängt ist. Mit seiner Kolbenstange greift der Hilfszylinder 17 an einer oberen Anlenkstelle 19 an, die an der Unterseite des zuunterst liegenden, innenliegenden Scherenarms 8 sich befindet. Die Wirkrichtung des Hilfszylinders 17 liegt in der Hubrichtung des Scherenhubgerüstes 3, in der Regel also in der Vertikalrichtung. Damit ist die Wirkrichtung des Hilfszylinders 17 exakt in derjenigen Vertikalebene angeordnet, in der die beim Hub des Scherenhubgerüstes 3 voneinander weg spreizenden Kreuzungsstellen 13 liegen. Anders als der Hubzylinder 14, der nur mit seiner kleineren Kraftkomponente in der unteren Ausgangslage am Scherenhubgerüst 3 angreift, wirkt die volle Kraft des Hilfszylinders 17 in der vertikalen Hubrichtung. Insbesondere unterstützt der Hilfszylinder 17 den Anfangshub des Scherenhubgerüstes 3 aus seiner abgesenkten Lage heraus, und da mit zunehmendem Aufrichtwinkel der Scherenarme 7, 8 die vertikale Kraftkomponente des Hubzylinders 14 zunimmt, kann dieser ab einer bestimmten Aufrichthöhe des Scherenhubgerüstes 3 allein die weiteren Hubkräfte bis zur oberen Endlage des aufgerichteten Scherenhubgerüstes 3 aufbringen. Deshalb genügt es, wenn der Hilfszylinder 17 nur über den anfänglichen Hubweg des Scherenhubgerüstes 3 wirksam ist, womit beim Hilfszylinder 17 Baulänge eingespart werden kann. So kommt ab einer bestimmten Aufrichthöhe die Kolbenstange des Hilfszylinders 17 an der Anlenkstelle 19 außer Eingriff mit dem zuunterst liegenden Scherenarm 8, und damit beim Absenken des Scherenhubgerüstes 3 das Ende der Kolbenstange des Hilfszylinders 17 an der Anlenkstelle 19 wieder sicher in Eingriff kommt, findet sich dort an der Unterseite des inneren Schwenkarms 8 eine geeignete Fangvorrichtung 20, die für eine exakte Justage des Hilfszylinders 17 bei Angriff an der Anlenkstelle 19 sorgt.In the middle under the scissor lift 3 is on the support frame 2 an auxiliary cylinder 17 arranged there at a pivot point 18 is suspended. With its piston rod the auxiliary cylinder 17 engages at an upper articulation point 19 at the bottom of the lowest, inner Scissor arm 8 is located. The direction of action of Auxiliary cylinder 17 lies in the lifting direction of the scissor lift 3, usually in the vertical direction. In order to the direction of action of the auxiliary cylinder 17 is exactly in arranged in the vertical plane in which the hub of the scissor mast 3 crossing points spread apart 13 lie. Unlike the lifting cylinder 14, the only with its smaller force component in the lower one Starting position on the scissor lift 3 attacks, the full effect Force of the auxiliary cylinder 17 in the vertical stroke direction. In particular, the auxiliary cylinder 17 supports the initial stroke the scissor lift 3 from its lowered Lay out, and there with increasing righting angle Scissor arms 7, 8 the vertical force component of the lifting cylinder 14 increases, it can rise above a certain level the scissor lift 3 alone the other lifting forces up to the upper end position of the erected scissor lift 3 apply. Therefore it is sufficient if the Auxiliary cylinder 17 only over the initial stroke of the scissor lift 3 is effective, with which the auxiliary cylinder 17th Overall length can be saved. So comes from a certain one Raising height on the piston rod of the auxiliary cylinder 17 the articulation point 19 out of engagement with the lowermost one Scissor arm 8, and thus when lowering the scissor lift 3 the end of the piston rod of the auxiliary cylinder 17 securely engages again at the articulation point 19, can be found there on the underside of the inner swivel arm 8 a suitable safety device 20, which for an exact Adjustment of the auxiliary cylinder 17 when attacking the articulation point 19 worries.

Weiter oben am Scherenhubgerüst 3 und zwar zwischen dem zweitoberen und drittoberen Scherenpaket 5 finden sich zwei weitere Hilfszylinder 21, die an den Außenseiten der außenliegenden Scherenarme 7 der betreffenden Scherenarmpaare 6 angeordnet sind. Diese Hilfszylinder 21 haben die gleiche vertikale Wirkrichtung wie der Hilfszylinder 17, ihre unteren Anlenkstellen 24 liegen in Höhe der Kreuzungsstellen 13 des unteren Scherenpaketes 5, während die oberen Anlenkstellen 23 der Hilfszylinder 21 im Bereich der Kreuzungsstellen des oberen Scherenpaketes 5 sich befinden. Die Kolbenstangen 22 dieser Hilfszylinder 21 haben ebenfalls eine Fangvorrichtung 25, damit die lose Anlenkstelle 23 sich hiervon ab einer bestimmten Aufrichthöhe beim weiteren Anheben abheben kann. Bei umgekehrter Bewegungsrichtung ist damit hier ebenfalls sichergestellt, daß die Anlenkstelle 23 wieder sicher in Eingriff mit der jeweiligen Kolbenstange 22 des betreffenden Hilfszylinders 21 kommt.Further up on the scissor lift 3 between the second upper and third upper scissors package 5 there are two further auxiliary cylinders 21, which are on the outer sides of the outer Scissor arms 7 of the relevant scissor arm pairs 6 are arranged. These auxiliary cylinders 21 have the same vertical direction of action as the auxiliary cylinder 17, their lower Articulation points 24 are located at the intersection points 13 of the lower pair of scissors 5, while the upper articulation points 23 of the auxiliary cylinder 21 in the area of the crossing points of the upper scissors package 5 are. The piston rods 22 of these auxiliary cylinders 21 also have one Safety gear 25 so that the loose link 23 itself of this from a certain upright height when lifting further can take off. With reverse direction of movement This also ensures that the articulation point 23 again securely in engagement with the respective piston rod 22 of the relevant auxiliary cylinder 21 comes.

Die beiden Hilfszylinder 21 sind beim Ausführungsbeispiel spiegelsymmetrisch zueinander auf gleicher Höhe des Scherenhubgerüstes 3 angeordnet, was nicht unbedingt erforderlich ist. Grundsätzlich können sowohl die oberen Hilfszylinder 21 als auch der untere Hilfszylinder 17 aus der in Höhenrichtung verlaufenden Quermittenebene heraus versetzt angeordnet werden, entscheidend ist lediglich, daß die Anlenkstellen 18 und 19 für den unteren Hilfszylinder 17 und die Anlenkstellen 23 und 24 für die oberen Hilfszylinder 21 sich beim Aufrichten des Scherenhubgerüstes 3 in Höhenrichtung voneinander entfernen. So können insbesondere die paarweise angeordneten, oberen Hilfszylinder 21 auch an den Enden der Scherenarme 7, 8 vorgesehen werden, weil sich auch dort Gelenkstellen mit einer durch die Scherenarmenden hindurchgeführten Achse befinden, die bei entsprechender Verlängerung über die Außenseiten der äußeren Scherenarme 7 hinaus für die Anlenkung der Hilfszylinder 21 genutzt werden können.The two auxiliary cylinders 21 are in the embodiment mirror-symmetrical to each other at the same height of the scissor lift 3 arranged, which is not absolutely necessary is. Basically, both the top auxiliary cylinders 21 and the lower auxiliary cylinder 17 from the in Height direction transverse center plane offset are arranged, the only decisive thing is that the articulation points 18 and 19 for the lower auxiliary cylinder 17 and the articulation points 23 and 24 for the upper auxiliary cylinders 21 itself when erecting the scissor lift 3 in the height direction separate from each other. So especially arranged in pairs, upper auxiliary cylinder 21 also on the Ends of the scissor arms 7, 8 are provided because themselves there also articulation points with one through the scissor arm ends passed axis are at the corresponding Extension over the outer sides of the outer scissor arms 7 can also be used for the articulation of the auxiliary cylinder 21 can.

Anstelle der Hilfszylinder 17, 21, wie sie in der Zeichnung dargestellt sind, können auch solche Zylinder verwendet werden, die den gesamten Hub zwischen den beidendigen Anlenkstellen mitmachen. Hierfür kommen dann Teleskopzylinder zum Einsatz.Instead of the auxiliary cylinder 17, 21, as in the drawing such cylinders can also be used the entire stroke between the two articulation points participate. Then come telescopic cylinders for use.

Claims (12)

Scherenhubsystem für Arbeitsbühnen mit einer Mehrzahl gleicher, übereinander angeordneter Scherenpakete (5), die jeweils aus einem außenliegenden Scherenarmpaar (6) und einem dazwischen kreuzend angeordneten Scherenarm (8) bestehen, der an der Kreuzungsstelle (13) mit dem Scherenarmpaar über eine quer zur Hubrichtung liegende Achse gelenkig verbunden ist, wobei an den Oberenden (10, 11) der Scherenarme (7, 8) des jeweils unteren Scherenpaketes (5) die Unterenden (9, 12) der Scherenarme (7, 8) des jeweils darüberliegenden Scherenpaketes (5) angelenkt sind und zumindest ein Hubzylinder (14) vorhanden ist, der im Bereich des zuunterst liegenden Scherenpaketes (5) mit seiner Wirkachse unter einem spitzen Winkel am inneren Scherenarm (8) angreift und gestellfest gegengelagert ist,
dadurch gekennzeichnet,
daß wenigstens ein Hilfszylinder (17, 21) in der Hubrichtung zwischen zwei voneinander beim Hub spreizenden Anlenkstellen (18, 19; 23, 24) angeordnet ist.
Scissor lift system for work platforms with a plurality of identical scissor assemblies (5) arranged one above the other, each consisting of an outer pair of scissor arms (6) and a scissor arm (8) crossing between them, which at the intersection (13) with the scissor arm pair in a direction transverse to the lifting direction horizontal axis is articulated, the lower ends (9, 12) of the scissor arms (7, 8) of the respective scissor package (5) on the upper ends (10, 11) of the scissor arms (7, 8) of the respective lower scissor package (5) are articulated and at least one lifting cylinder (14) is present, which acts in the area of the scissors bundle (5) at the bottom with its active axis at an acute angle on the inner scissor arm (8) and is counter-fixed to the frame,
characterized,
that at least one auxiliary cylinder (17, 21) is arranged in the stroke direction between two articulation points (18, 19; 23, 24) spreading apart during the stroke.
Scherenhubsystem nach Anspruch 1,
dadurch gekennzeichnet,
daß der zumindest eine Hilfszylinder (17, 21) in derjenigen in Höhenrichtung verlaufenden Querebene oder nahe dieser Querebene angeordnet ist, in der die Kreuzungsstellen (13) der Scherenarme (7, 8) liegen.
Scissor lift system according to claim 1,
characterized,
that the at least one auxiliary cylinder (17, 21) is arranged in the transverse plane running in the vertical direction or close to this transverse plane in which the crossing points (13) of the scissor arms (7, 8) lie.
Scherenhubsystem nach Anspruch 1,
dadurch gekennzeichnet,
daß der Hilfszylinder (17) zwischen dem Traggestell (2) und der Kreuzungsstelle (13) der Schwenkarme (7, 8) des zuunterst liegenden Scherenpaketes (5) angeordnet ist.
Scissor lift system according to claim 1,
characterized,
that the auxiliary cylinder (17) is arranged between the support frame (2) and the crossing point (13) of the swivel arms (7, 8) of the scissors package (5) lying at the bottom.
Scherenhubsystem nach Anspruch 3,
dadurch gekennzeichnet,
daß der Hilfszylinder (17) mittig unter dem zwischen dem außenliegenden Scherenarmpaar (6) befindlichen Scherenarm (8) angeordnet ist.
Scissor lifting system according to claim 3,
characterized,
that the auxiliary cylinder (17) is arranged centrally under the scissor arm (8) located between the outer pair of scissor arms (6).
Scherenhubsystem nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß zwei Hilfszylinder (21) an den Außenseiten der außenliegenden Scherenarmpaare (6) zweier Scherenarmpakete (5) angeordnet sind.
Scissor lifting system according to one of claims 1 to 4,
characterized,
that two auxiliary cylinders (21) are arranged on the outer sides of the outer pairs of scissors arms (6) of two sets of scissors arms (5).
Scherenhubsystem nach Anspruch 5,
dadurch gekennzeichnet,
daß die Hilfszylinder (21) an den Scherenarmpaaren (6) zweier benachbarter Scherenpakete (5) angeordnet sind.
Scissor lifting system according to claim 5,
characterized,
that the auxiliary cylinders (21) are arranged on the pairs of scissors arms (6) of two adjacent sets of scissors (5).
Scherenhubsystem nach Anspruch 5 oder 6,
dadurch gekennzeichnet,
daß die Hilfszylinder (21) an den Scherenarmpaaren (6) der beiden zuoberst liegenden Scherenpakete (5) angeordnet sind.
Scissor lift system according to claim 5 or 6,
characterized,
that the auxiliary cylinders (21) on the pairs of scissors arms (6) of the two uppermost scissor packs (5) are arranged.
Scherenhubsystem nach einem der Ansprüche 5 bis 7,
dadurch gekennzeichnet,
daß die Hilfszylinder (21) zumindest in einer derjenigen in Höhenrichtung verlaufenden Querebenen oder nahe zumindest einer dieser Querebenen angeordnet sind, die durch die Gelenke an den Enden der Scherenarme (7, 8) hindurchgehen.
Scissor lifting system according to one of claims 5 to 7,
characterized,
that the auxiliary cylinders (21) are arranged at least in one of those transverse planes running in the vertical direction or close to at least one of these transverse planes which pass through the joints at the ends of the scissor arms (7, 8).
Scherenhubsystem nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
daß die Hilfszylinder (21) im Bereich des Austrittsendes für die Kolbenstange (22) pendelnd an dem betreffenden Scherenarmpaar (6) angeordnet sind.
Scissor lift system according to one of claims 1 to 8,
characterized,
that the auxiliary cylinders (21) are arranged in the region of the outlet end for the piston rod (22) to swing on the pair of scissors arms (6) in question.
Scherenhubsystem nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
daß die Hilfszylinder (17, 21) für einen geringeren als den maximalen Hub zwischen den voneinander spreizenden Anlenkstellen (18, 19; 23, 24) ausgelegt und mit einer der beiden Anlenkstellen (19, 23) in Hubrichtung lose verbunden sind.
Scissor lifting system according to one of claims 1 to 9,
characterized,
that the auxiliary cylinders (17, 21) are designed for a shorter than the maximum stroke between the articulated pivot points (18, 19; 23, 24) and are loosely connected to one of the two pivot points (19, 23) in the stroke direction.
Scherenhubsystem nach Anspruch 8,
dadurch gekennzeichnet,
daß an der losen Anlenkstelle (19, 23) an dem betreffenden Scherenarmpaar (6) und/oder an dem jeweiligen Hubzylinder (17, 21) eine Fangvorrichtung (20, 25) zum sicheren Herstellen der Verbindung beim Senkvorgang angeordnet ist.
Scissor lift system according to claim 8,
characterized,
that a safety device (20, 25) is arranged on the loose articulation point (19, 23) on the relevant pair of scissors arms (6) and / or on the respective lifting cylinder (17, 21) for securely establishing the connection during the lowering process.
Scherenhubsystem nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
daß die Hilfszylinder (17, 21) Teleskopzylinder sind.
Scissor lifting system according to one of claims 1 to 9,
characterized,
that the auxiliary cylinders (17, 21) are telescopic cylinders.
EP97122979A 1997-01-14 1997-12-30 Scissors lift system for working platforms Expired - Lifetime EP0854110B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29700496U 1997-01-14
DE29700496U DE29700496U1 (en) 1997-01-14 1997-01-14 Scissor lift system for work platforms

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EP0854110B1 EP0854110B1 (en) 2003-01-29

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AT (1) ATE231820T1 (en)
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
FR2903974A1 (en) * 2006-07-19 2008-01-25 Twist Sarl Movable cage lifting device for control tower i.e. aviation terrain control tower, has scissors connecting frame to nacelle floor, integral unfolding hydraulic jack unfolding scissors, and cage unfolding jack unfolding cage
CN101391733A (en) * 2008-07-25 2009-03-25 白天海 Hydraulic mobile lifting platform and labor-saving apparatus
CN101817488A (en) * 2010-05-18 2010-09-01 高树伟 Lift fetching vehicle
US8267222B2 (en) 2009-02-05 2012-09-18 Kan Cui Compact scissors lift
CN110154001A (en) * 2019-06-17 2019-08-23 清华大学 Positioning robot

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004044969A1 (en) * 2004-09-01 2006-03-02 Hans Balzer Gmbh & Co. Kg Werkstatt- Und Fahrzeugtechnik Lifting device for motor and rail vehicles comprises a platform which moves along a pit base
CN102862930A (en) * 2012-09-25 2013-01-09 济南大力神机械制造有限公司 Scissor lift

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US2402579A (en) * 1945-05-24 1946-06-25 Weaver Mfg Co Load lifter
US2945551A (en) * 1957-08-05 1960-07-19 Mark H Annin Portable platform elevating device
US3596735A (en) * 1969-10-30 1971-08-03 Howard H Denier Portable elevator working and load-lifting platform
GB1403973A (en) * 1973-09-10 1975-08-28 Mark Ind Scissors lift assembly
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2903974A1 (en) * 2006-07-19 2008-01-25 Twist Sarl Movable cage lifting device for control tower i.e. aviation terrain control tower, has scissors connecting frame to nacelle floor, integral unfolding hydraulic jack unfolding scissors, and cage unfolding jack unfolding cage
CN101391733A (en) * 2008-07-25 2009-03-25 白天海 Hydraulic mobile lifting platform and labor-saving apparatus
US8267222B2 (en) 2009-02-05 2012-09-18 Kan Cui Compact scissors lift
CN101817488A (en) * 2010-05-18 2010-09-01 高树伟 Lift fetching vehicle
CN110154001A (en) * 2019-06-17 2019-08-23 清华大学 Positioning robot

Also Published As

Publication number Publication date
ATE231820T1 (en) 2003-02-15
EP0854110B1 (en) 2003-01-29
DE59709226D1 (en) 2003-03-06
DE29700496U1 (en) 1997-02-20

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