EP0356761B1 - Scissor lift device, especially for a working platform - Google Patents
Scissor lift device, especially for a working platform Download PDFInfo
- Publication number
- EP0356761B1 EP0356761B1 EP89114506A EP89114506A EP0356761B1 EP 0356761 B1 EP0356761 B1 EP 0356761B1 EP 89114506 A EP89114506 A EP 89114506A EP 89114506 A EP89114506 A EP 89114506A EP 0356761 B1 EP0356761 B1 EP 0356761B1
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- European Patent Office
- Prior art keywords
- scissor
- arms
- scissors
- arm
- arrangement according
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Classifications
-
- 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
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/22—Lazy-tongs mechanisms
-
- 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
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting 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
- B66F11/042—Lifting 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 lifting device, in particular for a working platform, with a lower frame, an upper frame, a scissor gear connecting both frames in the form of a Nuremberg scissors with at least two scissors arranged one above the other, each scissor having two scissor arms, each of which is approximately in the middle Bearing for a scissor pin that connects both scissor arms articulated about an imaginary scissor axis, and of which each scissor arm has connecting bearings for connecting bolts at its ends, and wherein a first scissor arm of the lower scissors articulated with its lower end and the lower end of the other scissor arm slidably and articulatedly connected to the subframe, and with a drive for the scissors gear.
- a scissor lifting device of this type is known from DE-A 31 51 031.
- the previously known scissor lifting devices have a scissor gear with two or more scissors, which are connected by cross struts, to thereby form a torsionally rigid box.
- DE-A1-31 51 031 arrange the scissor arms of each individual scissors at a distance from each other and connect these scissor arms in the middle by means of a transverse yoke and provide intermediate supports at the ends of the arms of the scissors arranged one above the other so that each of the individual scissors results in a box-like structure with less construction leads.
- the invention has for its object to provide a scissor lifting device, in particular for a working platform, with the features mentioned above, which compared to the scissor lifting device known from DE-A1-31 51 031 with a scissor gear in the manner of a Nuremberg scissors, an even more simplified design having.
- the invention is based on the idea of consciously accepting the tilting of the articulated connections. This creates the possibility that in a scissor gear designed as a Nuremberg scissors with at least two superposed scissors for connecting the scissor arms of each pair of scissors no cross yoke and no intermediate beams are required.
- the result of the scissor lifting device according to the invention is that the actuation or asymmetrical loading of the scissor lifting device prestresses the joints of the scissors by torsional moments, so that these joints are made free of play during operation.
- the invention therefore deliberately accepts a deterioration in the efficiency of the scissor drive in order to create a very simple and yet stable construction of a scissor lifting device.
- the drive conditions when the scissors gear is folded i.e. when the upper frame is completely lowered, are the most unfavorable
- the scissors axis is arranged at a distance above the plane defined by the connecting axes at the end of this swivel arm. This results in more favorable leverage ratios for transmitting the power of the drive created on the scissors gear. It has proven to be advantageous to provide this measure for all scissor arms of the scissor gear.
- the scissor lifting device for a working platform shown in the drawing has a scissor gear with three scissor axes 4 of three scissors 1, 2 and 3 arranged one above the other.
- the scissor gear connects a lower frame 10 to an upper frame 11.
- Each of these scissors 1, 2 and 3 consists of only two scissor arms 1a and 1b or 2a and 2b and 2a and 2b as well as 3a and 3b, which are pivotally connected to one another in their center.
- the scissor arms are hollow and square in cross-section.
- Each scissor arm a and b of a pair of scissors is pivotally connected at least at one of its ends about a connecting axis 5 to the end of a scissor arm b or a of an adjacent pair of scissors.
- the articulated connections with the axes 5 are designed exactly like the articulated connections with the axes 4.
- the lower end of the swivel arm 1a is pivotally connected to the subframe 10 about an axis 6, which in the exemplary embodiment shown is designed as a chassis that can be moved on wheels.
- the lower end of the scissor arm 1b of the lowermost scissors 1 is pivotally and displaceably connected to the subframe 10 about an axis 7.
- a drive 12 designed as a lifting cylinder in the illustrated embodiment is pivotally connected to the subframe 10 by its cylinder.
- the piston rod of the drive 12 engages at a point of application below the scissor axis 4 of the scissor arm 1a.
- the upper end of the scissor arm 3b is pivotally connected about an axis 8 to the upper frame 11, which carries a working platform.
- the upper end of the scissor arm 3a is pivotally and displaceably connected to the upper frame 11 about an axis 9.
- the scissor arms 1a, 2a and 3a have bores 13 for bearing bolts 15 which are each firmly connected to the outside of the corresponding scissor arms 1a, 2a and 3a by means of a weld seam 19.
- the scissor arms 1b, 2b and 3b have bores 14 for a bush 16 which is provided with a pressed-in bearing bush 17 for the bearing bolt 15.
- the bushes 16 are fastened in the bores 14 with the scissor arms 1b, 2b and 3b on the outside thereof by means of weld seams 20.
- the middle bores 13 and 14 for the scissor axes 4 are arranged at a distance a above the plane, through the connecting axes 5 the ends of the scissor arms is defined.
- This arrangement of the scissor axes 4 results in more favorable lever ratios for the attack of the drive 12 when the upper frame 11 is in the lowered state.
- the bearing bolts 15, which are firmly connected to the scissor arms 1a, 2a and 3a, are inserted into the corresponding bearing bushes 17 of the scissor arms 1b, 2b and 3b and secured by retaining rings 18 which are fastened to the bolt 15 by screws 18 '.
- Distance d of the articulated scissor arms a, b of a pair of scissors is greater than 1/20 of the thickness h of the profile of the scissor arms measured perpendicular to the articulation axis 4, 5 and not greater than half this profile thickness h.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Jib Cranes (AREA)
- Manipulator (AREA)
Description
Die Erfindung betrifft eine Scherenhubvorrichtung, insbesondere für eine Arbeitsbühne, mit einem Unterrahmen, einem Oberrahmen, einem beide Rahmen verbindenden Scherengetriebe in Form einer Nürnberger Schere mit mindestens zwei übereinander angeordneten Scheren, wobei jede Schere zwei Scherenarme aufweist, von denen jeder etwa in seiner Mitte ein Lager für einen Scherenbolzen aufweist, der beide Scherenarme um eine gedachte Scherenachse gelenkig miteinander verbindet, und von denen jeder Scherenarm an seinen Enden Verbindungslager für Verbindungsbolzen aufweist, und wobei ein erster Scherenarm der untersten Schere mit seinem unteren Ende gelenkig und das untere Ende des anderen Scherenarms verschiebbar und gelenkig mit dem Unterrahmen verbunden ist, und mit einem Antrieb für das Scherengetriebe.The invention relates to a scissor lifting device, in particular for a working platform, with a lower frame, an upper frame, a scissor gear connecting both frames in the form of a Nuremberg scissors with at least two scissors arranged one above the other, each scissor having two scissor arms, each of which is approximately in the middle Bearing for a scissor pin that connects both scissor arms articulated about an imaginary scissor axis, and of which each scissor arm has connecting bearings for connecting bolts at its ends, and wherein a first scissor arm of the lower scissors articulated with its lower end and the lower end of the other scissor arm slidably and articulatedly connected to the subframe, and with a drive for the scissors gear.
Eine Scherenhubvorrichtung dieser Art ist durch die DE-A 31 51 031 bekannt. In dieser Druckschrift heißt es, daß die vorher bekannten Scherenhubvorrichtungen ein Scherengetriebe mit zwei oder mehreren Scheren aufweisen, die durch Querstreben verbunden sind, um dadurch einen torsionssteifen Kasten zu bilden. Um diese aufwendige Bauweise der vor der Anmeldung der DE-A1 31 51 031 bekannten Scherenhubvorrichtungen bei einem Scherengetriebe in Form einer Nürnberger Schere zu vermeiden, ist es durch die DE-A1-31 51 031 bekannt, die Scherenarme einer jeden Einzelschere in einem Abstand voneinander anzuordnen und diese Scherenarme in der Mitte durch ein Querjoch zu verbinden und an den miteinander zu verbindenden Enden der Arme der übereinander angeordneten Scheren Zwischenträger vorzusehen, so daß jede der einzelnen Scheren bei geringerem Bauaufwand zu einem kastenähnlichen Aufbau führt.A scissor lifting device of this type is known from DE-A 31 51 031. In this publication it is stated that the previously known scissor lifting devices have a scissor gear with two or more scissors, which are connected by cross struts, to thereby form a torsionally rigid box. In order to avoid this complex construction of the scissor lifting devices known before the registration of DE-A1 31 51 031 in a scissor gear in the form of a Nuremberg scissors, it is known from DE-A1-31 51 031 arrange the scissor arms of each individual scissors at a distance from each other and connect these scissor arms in the middle by means of a transverse yoke and provide intermediate supports at the ends of the arms of the scissors arranged one above the other so that each of the individual scissors results in a box-like structure with less construction leads.
Der Erfindung liegt die Aufgabe zugrunde, eine Scherenhubvorrichtung, insbesondere für eine Arbeitsbühne, mit den eingangs genannten Merkmalen zu schaffen, die gegenüber der durch die DE-A1-31 51 031 bekannten Scherenhubvorrichtung mit einem Scherengetriebe in Art einer Nürnberger Schere eine noch weiter vereinfachte Bauweise aufweist.The invention has for its object to provide a scissor lifting device, in particular for a working platform, with the features mentioned above, which compared to the scissor lifting device known from DE-A1-31 51 031 with a scissor gear in the manner of a Nuremberg scissors, an even more simplified design having.
Diese Aufgabe ist durch die Kombination der im Anspruch 1 genannten Merkmale gelöst.This object is achieved by the combination of the features mentioned in
Die Fachwelt ging, wie das der Stand der Technik zeigt, immer davon aus, die Scherenbolzen, die die Arme der übereinander angeordneten Scheren miteinander verbinden, von den durch den Antrieb verursachten entgegengesetzt gerichteten Torsionsmomenten zu entlasten, da diese Belastung durch die Torsionsmomente zu einer Verkantung der gelenkigen Verbindungen und dadurch zu erhöhten Reibungskräften führt. Entgegen dieser herrschenden Lehre liegt der Erfindung der Gedanke zugrunde, das Verkanten der gelenkigen Verbindungen bewußt in Kauf zu nehmen. Dadurch wird die Möglichkeit geschaffen, daß bei einem als Nürnberger Schere ausgebildeten Scherengetriebe mit mindestens zwei übereinander angeordneten Scheren für die Verbindung der Scherenarme einer jeden Schere kein Querjoch und keine Zwischenträger erforderlich sind.As the state of the art shows, experts always assumed that the shear bolts that connect the arms of the shears arranged one above the other were relieved of the opposing torsional moments caused by the drive, since this load caused by the torsional moments caused a cant the articulated connections and thus leads to increased frictional forces. Contrary to this prevailing teaching, the invention is based on the idea of consciously accepting the tilting of the articulated connections. This creates the possibility that in a scissor gear designed as a Nuremberg scissors with at least two superposed scissors for connecting the scissor arms of each pair of scissors no cross yoke and no intermediate beams are required.
Durch die erfindungsgemäße Scherenhubvorrichtung wird erreicht, daß durch die Betätigung oder unsymmetrische Belastung der Scherenhubvorrichtung die Gelenke der Scheren durch Torsionsmomente vorgespannt werden, so daß diese Gelenke im Betrieb spielfrei gemacht werden.The result of the scissor lifting device according to the invention is that the actuation or asymmetrical loading of the scissor lifting device prestresses the joints of the scissors by torsional moments, so that these joints are made free of play during operation.
Durch eine angepaßte Wahl des Querschnittes der Scherenarme und der Länge der durch die Scherenarme verlaufenden Lager der gelenkigen Verbindungen wird bei einer Belastung im Sinne einer Verkantung und bei einer entsprechenden Wahl des Antriebes eine Beweglichkeit des Scherengetriebes trotz der Verkantung ermöglicht. Durch diese Verkantungen werden jedoch überraschenderweise spielfreie gelenkige Verbindungen geschaffen, was zu einer sehr steifen aber einfachen Bauweise des Scherengetriebes führt, ohne daß dabei befürchtet werden muß, daß sich das Scherengetriebe seitlich zu der genannten gedachten Mittelebene verbiegt und die Scherenhubvorrichtung zum Kippen kommt.Through an adapted choice of the cross section of the scissor arms and the length of the bearings of the articulated connections running through the scissor arms, mobility of the scissor gear is made possible in spite of the tilting in the event of a load in the sense of tilting and with a corresponding choice of the drive. Through these canting, however, play-free articulated connections are surprisingly created, which leads to a very stiff but simple construction of the scissor gear without fear that the scissor gear bends laterally to the imaginary median plane mentioned and the scissor lifting device tilts.
Die Erfindung nimmt also absichtlich eine Verschlechterung des Wirkungsgrades des Scherenantriebes in Kauf, um dadurch eine sehr einfache und doch stabile Bauweise einer Scherenhubvorrichtung zu schaffen. Da jedoch, z.B. bei der Wahl eines Hubzylinders als Antrieb, die Antriebsverhältnisse bei zusammengeklapptem Scherengetriebe, also wenn der Oberrahmen ganz abgesenkt ist, am ungünstigsten sind, ist bei einer vorteilhaften Ausführungsform der Erfindung vorgesehen, daß mindestens bei dem Scherenarm, an dem der Antrieb angreift, die Scherenachse in einem Abstand über der Ebene angeordnet ist, die durch die Verbindungsachsen an den Endes dieses Schwenkarmes definiert ist. Dadurch werden günstigere Hebelverhältnisse zur Übertragung der Kraft des Antriebes auf das Scherengetriebe geschaffen. Es hat sich als günstig erwiesen, diese Maßnahme bei allen Scherenarmen des Scherengetriebes vorzusehen.The invention therefore deliberately accepts a deterioration in the efficiency of the scissor drive in order to create a very simple and yet stable construction of a scissor lifting device. However, since, for example when choosing a lifting cylinder as the drive, the drive conditions when the scissors gear is folded, i.e. when the upper frame is completely lowered, are the most unfavorable, it is provided in an advantageous embodiment of the invention that at least the scissor arm on which the drive acts , the scissors axis is arranged at a distance above the plane defined by the connecting axes at the end of this swivel arm. This results in more favorable leverage ratios for transmitting the power of the drive created on the scissors gear. It has proven to be advantageous to provide this measure for all scissor arms of the scissor gear.
Die Erfindung ist in der folgenden Beschreibung eines in der Zeichnung dargestellten Ausführungsbeispieles einer Arbeitsbühne im einzelnen erläutert.The invention is explained in detail in the following description of an embodiment of a working platform shown in the drawing.
Es zeigen:
- Fig. 1
- eine schaubildliche Darstellung des Ausführungsbeispieles mit nach oben ausgefahrener Arbeitsbühne;
- Fig. 2
- einen Axialschnitt durch eine gelenkige Verbindung der Scherenarme des Scherengetriebes;
- Fig. 3
- eine Seitenansicht eines Scherenarmes.
- Fig. 4
- eine schematische Darstellung einer gelenkigen Verbindung der Scherenarme.
- Fig. 1
- a schematic representation of the embodiment with the work platform extended upwards;
- Fig. 2
- an axial section through an articulated connection of the scissor arms of the scissor gear;
- Fig. 3
- a side view of a scissor arm.
- Fig. 4
- a schematic representation of an articulated connection of the scissor arms.
Die in der Zeichnung dargestellte Scherenhubvorrichtung für eine Arbeitsbühne weist ein Scherengetriebe mit drei übereinander angeordneten Scherenachsen 4 von drei Scheren 1, 2 und 3 auf. Das Scherengetriebe verbindet einen Unterrahmen 10 mit einem Oberrahmen 11. Jede dieser Scheren 1, 2 und 3 besteht aus nur zwei miteinander in ihrer Mitte gelenkig um eine Scherenachse 4 schwenkbar miteinander verbundenen Scherenarmen 1a und 1b bzw. 2a und 2b sowie 3a und 3b. Die Scherenarme sind hohl und im Querschnitt quadratisch.The scissor lifting device for a working platform shown in the drawing has a scissor gear with three scissor axes 4 of three
Jeder Scherenarm a und b einer Schere ist mindestens an einem seiner Enden um eine Verbindungsachse 5 schwenkbar mit dem Ende eines Scherenarmes b bzw. a einer benachbarten Schere gelenkig verbunden.Each scissor arm a and b of a pair of scissors is pivotally connected at least at one of its ends about a connecting
Die gelenkigen Verbindungen mit den Achsen 5 sind genau so ausgebildet wie die gelenkigen Verbindungen mit den Achsen 4.The articulated connections with the
Das untere Ende des Schwenkarmes 1a ist um eine Achse 6 schwenkbar mit dem Unterrahmen 10 verbunden, der beim dargestellten Ausführungsbeispiel als auf Rädern verfahrbares Fahrgestell ausgebildet ist.The lower end of the
Das untere Ende des Scherenarmes 1b der untersten Schere 1 ist um eine Achse 7 schwenkbar und verschiebbar mit dem Unterrahmen 10 verbunden.The lower end of the scissor arm 1b of the
Ein beim dargestellten Ausführungsbeispiel als Hubzylinder ausgebildeter Antrieb 12 ist mit seinem Zylinder schwenkbar mit dem Unterrahmen 10 verbunden. Die Kolbenstange des Antriebes 12 greift an einem Angriffspunkt unterhalb der Scherenachse 4 des Scherenarmes 1a an.A
Das obere Ende des Scherenarmes 3b ist um eine Achse 8 schwenkbar mit dem Oberrahmen 11 verbunden, der eine Arbeitsbühne trägt. Das obere Ende des Scherenarmes 3a ist um eine Achse 9 schwenkbar und verschiebbar mit dem Oberrahmen 11 verbunden.The upper end of the
Da alle gelenkigen Verbindungen zwischen den Scherenarmen gleich ausgebildet sind, ist in Fig.2 eine dieser Verbindungen im Axialschnitt längs einer Achse 4 bzw. 5 dargestellt.Since all articulated connections between the scissor arms are of the same design, one of these connections is shown in axial section along an
Die Scherenarme 1a, 2a und 3a weisen Bohrungen 13 für Lagerbolzen 15 auf, die mittels je einer Schweißnaht 19 mit der Außenseite der entsprechenden Scherenarme 1a, 2a bzw. 3a fest verbunden sind.The
Die Scherenarme 1b, 2b und 3b weisen Bohrungen 14 für eine Büchse 16 auf, die mit einer eingepreßten Lagerbüchse 17 für den Lagerbolzen 15 versehen ist.The
Die Büchsen 16 sind in den Bohrungen 14 mit den Scherenarmen 1b, 2b und 3b an deren Außenseite mittels Schweißnähten 20 befestigt.The
Wie das aus Fig.3 ersichtlich ist, sind bei allen Scherenarmen 1a, 2a und 3a sowie 1b, 2b und 3b die mittleren Bohrungen 13 bzw. 14 für die Scherenachsen 4 in einem Abstand a über der Ebene angeordnet, die durch die Verbindungsachsen 5 an den Enden der Scherenarme definiert ist. Durch diese Anordnung der Scherenachsen 4 ergeben sich günstigere Hebelverhältnisse für den Angriff des Antriebes 12, wenn sich der Oberrahmen 11 in abgesenktem Zustand befindet.As can be seen from FIG. 3, in all
Beim Zusammenbau des Scherengetriebes werden die mit den Scherenarmen 1a, 2a und 3a fest verbundenen Lagerbolzen 15 in die entsprechenden Lagerbüchsen 17 der Scherenarme 1b, 2b und 3b gesteckt und durch Sicherungsringe 18 gesichert, die auf den Bolzen 15 durch Schrauben 18' befestigt sind.When assembling the scissor gear, the
Dadurch, daß der Antrieb 12 an einem Scherenarm, nämlich am Scherenarm 1a, angreift, werden die an den beiden Enden der Scherenarme angreifenden entgegengesetzten Torsionskräfte nicht verringert, sondern vergrößert. Dadurch sind insbesondere die gelenkigen Verbindungen an den Achsen 5 auf Verkanten vorgespannt. Die sich dadurch ergebenden spielfreien Gelenke geben dem ganzen Scherengetriebe eine große Steifheit, so daß zum Tragen der Hebebühne eine weitere Abstützung durch ein paralleles Scherengetriebe nicht erforderlich ist. Es ergibt sich dadurch eine sehr einfache Bauweise der Scherenhubvorrichtung.Because the
Das gleiche Ergebnis kann entweder zusammen mit der oben beschriebenen Anordnung des Angriffspunktes des Antriebes 12 oder bei einer anderen Anordnung desselben auch allein mit der folgenden Maßnahme erreicht werden. Diese alternative Maßnahme besteht darin, daß der in Fig. 4 dargestellte lichteThe same result can be achieved either together with the arrangement of the point of application of the
Abstand d der gelenkig miteinander verbundenen Scherenarme a, b einer Schere größer ist als 1/20 der senkrecht zu der Gelenkachse 4,5 gemessenen Stärke h des Profils der Scherenarme und nicht größer als die Hälfte dieser Profilstärke h.Distance d of the articulated scissor arms a, b of a pair of scissors is greater than 1/20 of the thickness h of the profile of the scissor arms measured perpendicular to the
Die vorstehende Beschreibung und die Zeichnung beschränken sich nur auf die Angabe von Merkmalen, die für die beispielsweise Verkörperung der Erfindung wesentlich sind. Soweit daher Merkmale in der Beschreibung und in der Zeichnung offenbart und in den Ansprüchen nicht genannt sind, dienen sie erforderlichenfalls auch zur Bestimmung des Gegenstandes der Ansprüche.The above description and the drawing are limited to the specification of features which are essential for the embodiment of the invention, for example. To the extent that features are disclosed in the description and in the drawing and are not mentioned in the claims, they also serve, if necessary, to determine the subject matter of the claims.
Claims (7)
- Scissor-like arrangement, in particular for a working platform having:a) a lower frame (10);b) an upper frame (11);c) a scissor transmission which connects the two frames (10 and 11), is in the form of lazy tongs, and has at least two superimposed pairs of scissors;d) wherein each pair of scissors comprises a first and a second scissor arm (a, b), each of which comprises approximately in its centre a bearing for a scissor bolt which connects the two scissor arms to one another such that they are hinged about an imaginary scissor axis (4), and each of which scissor arms comprises at its ends a connection bearing for connection bolts (5, 6, 7, 8, 9); ande) wherein the lower end of the first scissor arm (1a) of the lowermost pair of scissors is connected to the lower frame in a hinged manner and the lower end of the second scissor arm (1b) is connected to the lower frame in a displaceable and hinged manner; andf) a drive (12) for the scissor transmission;characterized in that:- the drive (12) engages on one of the scissor arms (1a, 1b) of the lowermost pair of scissors at a distance from an imaginary central plane of the scissor transmission which extends between the scissor arms, perpendicularly to the imaginary scissor axis (4).
- Scissor lifting arrangement according to Claim 1, characterized in that the drive (12) engages on the first scissor arm (1a) in the vicinity of the centre thereof.
- Scissor lifting arrangement according to either of Claims 1 and 2, characterized in that, at least in the case of the scissor arm (1a) to which the drive (12) is connected, the imaginary scissor axis (4) is disposed at a distance (a) above the plane which is defined by the axes (5) of the connection bolts at the ends of this scissor arm.
- Scissor lifting arrangement according to any one of Claims 1 to 3, characterized in that the scissor and connection bolts extend in the two pivot arms (1a, 1b; 2a, 2b) which are connected thereby through the entire cross-section thereof.
- Scissor lifting arrangement according to any one of Claims 1 to 4, characterized in that the scissor and connection bolts are secured in a scissor arm (1a, 2a, 3a) and engage in a bearing bush (16) which is secured in the other scissor arm (1b, 2b, 3b).
- Scissor lifting arrangement according to any one of Claims 1 to 5, characterized in that the clearance (d) between the scissor arms (a, b) of one pair of scissors connected to one another in a hinged manner is greater than 1/20 of the thickness (h) of the profile of the scissor arms measured perpendicularly to the hinged axis (4, 5).
- Scissor lifting arrangement according to Claim 6, characterized in that the said clearance (d) is not greater than half the said thickness of the scissor arm profiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89114506T ATE86226T1 (en) | 1988-08-10 | 1989-08-05 | SCISSOR LIFTING DEVICE, PARTICULARLY FOR A WORK PLATFORM. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| WOPCT/NL88/00038 | 1988-08-10 | ||
| PCT/NL1988/000038 WO1990001456A1 (en) | 1988-08-10 | 1988-08-10 | Scissor lift mechanism for work platforms |
| DE8904060U | 1989-04-03 | ||
| DE8904060U DE8904060U1 (en) | 1989-04-03 | 1989-04-03 | Scissor lifting device, in particular for a work platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0356761A1 EP0356761A1 (en) | 1990-03-07 |
| EP0356761B1 true EP0356761B1 (en) | 1993-03-03 |
Family
ID=25954609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89114506A Expired - Lifetime EP0356761B1 (en) | 1988-08-10 | 1989-08-05 | Scissor lift device, especially for a working platform |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5113972A (en) |
| EP (1) | EP0356761B1 (en) |
| DE (1) | DE58903646D1 (en) |
| ES (1) | ES2038383T3 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2115870C (en) * | 1993-08-31 | 1999-01-05 | Kenneth J. Zimmer | Single beam aerial work platform |
| US6276489B1 (en) | 1999-02-10 | 2001-08-21 | Genie Industries, Inc. | Flanged cross tubes for use in scissors linkages |
| US6637711B2 (en) * | 2001-06-08 | 2003-10-28 | Draper, Inc. | Projector lift |
| US7631848B2 (en) | 2001-06-08 | 2009-12-15 | Draper, Inc. | Projector lift |
| US20080105498A1 (en) * | 2006-06-12 | 2008-05-08 | Genie Industries, Inc. | Joint assembly and related methods |
| US9670039B1 (en) | 2011-06-03 | 2017-06-06 | Draper, Inc. | Projector lift |
| FR3035098B1 (en) * | 2015-04-18 | 2017-03-31 | Haulotte Group | LIFTING BOOM WITH SCISSOR LIFTING MECHANISM |
| USD841276S1 (en) * | 2016-04-04 | 2019-02-19 | Manitou Bf | Aerial work platform |
| WO2018208926A1 (en) * | 2017-05-09 | 2018-11-15 | The Board Of Regents For Oklahoma State University | Apparatus for branched scissor linkage and associated auxetic mechanisms |
| US11702327B2 (en) * | 2017-05-09 | 2023-07-18 | The Board Of Regents For Oklahoma State University | Apparatus for branched scissor linkage and associated auxetic mechanisms |
| USD854775S1 (en) * | 2017-06-28 | 2019-07-23 | G.S.Ace Industry Co., Ltd. | Elevation apparatus for lift table |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US682932A (en) * | 1900-09-06 | 1901-09-17 | Israel Louis Dreeben | Truck. |
| US1261633A (en) * | 1917-07-23 | 1918-04-02 | Jacob Frank Shuford | Combination truck and movable platform. |
| US1448932A (en) * | 1922-03-31 | 1923-03-20 | Jesse P Mayhugh | Portable extensible support |
| US1592770A (en) * | 1925-12-03 | 1926-07-13 | James A Reynolds Jr | Shoe or platform raising device |
| US2402579A (en) * | 1945-05-24 | 1946-06-25 | Weaver Mfg Co | Load lifter |
| US3621940A (en) * | 1969-11-03 | 1971-11-23 | Alois Lodige | Scissor action hoist |
| GB1502778A (en) * | 1974-12-10 | 1978-03-01 | Rogers D | Scissor lift mechanism with actuating device |
| FR2317218A1 (en) * | 1975-07-07 | 1977-02-04 | Systems Manufacturing Co | Lazy-tongs lifting platform mechanism - has ram acting between cross-members of lowermost arms and next ones up (NL110177) |
| US4130178A (en) * | 1977-03-28 | 1978-12-19 | Smith Raymond E Jun | Elevating device |
| DE3151031A1 (en) * | 1981-11-13 | 1983-05-19 | Trepel Ag, 6200 Wiesbaden | Scissor lift table |
| EP0089389B1 (en) * | 1982-03-22 | 1986-11-26 | Coates Management Pty. Ltd. | Elevating apparatus |
| DE3248414A1 (en) * | 1982-11-05 | 1984-06-28 | Otto Nußbaum GmbH & Co KG, 7640 Kehl | Lifting device, in particular hoist for motor vehicles |
| US4576249A (en) * | 1984-09-24 | 1986-03-18 | Zima John P | Device for fighting fires in highrise buildings and towers |
| DE3527324A1 (en) * | 1985-07-31 | 1987-02-12 | Trepel Ag | Scissor-type lifting table |
| SE456342B (en) * | 1986-07-04 | 1988-09-26 | Edmo Torbjoern Ab | LIFTING MECHANISM WITH ATMINSTONE TWO INSERTED THROUGH A LED OR AXEL SWINGABLY CONNECTED SAXAR ARMS |
| DE8706017U1 (en) * | 1987-04-25 | 1987-06-19 | Langewellpott, Ernst, 4992 Espelkamp | Scissor lift |
| US4930598A (en) * | 1988-07-25 | 1990-06-05 | 501 Sky Climber, Inc. | Scissors lift apparatus |
-
1989
- 1989-08-05 DE DE8989114506T patent/DE58903646D1/en not_active Expired - Fee Related
- 1989-08-05 EP EP89114506A patent/EP0356761B1/en not_active Expired - Lifetime
- 1989-08-05 ES ES198989114506T patent/ES2038383T3/en not_active Expired - Lifetime
- 1989-08-10 US US07/392,063 patent/US5113972A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2038383T3 (en) | 1993-07-16 |
| US5113972A (en) | 1992-05-19 |
| EP0356761A1 (en) | 1990-03-07 |
| DE58903646D1 (en) | 1993-04-08 |
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