EP0336927A1 - Mobile vehicle hoist - Google Patents

Mobile vehicle hoist Download PDF

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Publication number
EP0336927A1
EP0336927A1 EP89890095A EP89890095A EP0336927A1 EP 0336927 A1 EP0336927 A1 EP 0336927A1 EP 89890095 A EP89890095 A EP 89890095A EP 89890095 A EP89890095 A EP 89890095A EP 0336927 A1 EP0336927 A1 EP 0336927A1
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EP
European Patent Office
Prior art keywords
lifting arm
piston unit
lifting
cylinder
free end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89890095A
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German (de)
French (fr)
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EP0336927B1 (en
Inventor
Hydraulik-Gesellschaft M.B.H. Stelzl
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Stelzl Hydraulik-Gesellschaft Mbh
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Stelzl Hydraulik-Gesellschaft Mbh
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Publication of EP0336927A1 publication Critical patent/EP0336927A1/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
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
    • 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
    • B66F7/0625—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement with wheels for moving around the floor
    • 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
    • B66F7/0641—Single levers, e.g. parallel links

Definitions

  • the invention relates to a mobile lifting platform for lifting motor vehicles with a pivotable lifting arm which is pivotably articulated on a movable base frame and can be lowered into a position between lateral parts of the base frame which form an access ramp, the lifting arm at the free end of the same lateral support arms carries, which are guided parallel to the floor level with a parallelogram and the lifting arm is pivotable by means of a hydraulic cylinder-piston unit, the cylinder-piston unit engages at a distance from the free end of the lifting arm, which corresponds to at least 15% of the length of the lifting arm, and on a method for lifting a motor vehicle with such a lifting platform.
  • movable devices for lifting motor vehicles In addition to stationary lifting platforms, in which a platform can usually be raised via four lifting drives arranged at the corners of a platform, movable devices for lifting motor vehicles have become known, which are referred to as marshalling jacks.
  • the first-mentioned stationary devices for lifting motor vehicles have proven themselves in workshops and, after lifting the motor vehicle, allow largely free access to many units, in particular the transmission of the cardan shaft and the exhaust.
  • differently constructed jacks for example the aforementioned jacking jacks, are more suitable, in which the motor vehicle can be raised at correspondingly stiffened and stable points on its body, so that the tires can be lifted off the tread.
  • a mobile lifting platform has now been created in which the lifting of a motor vehicle is possible with a single movable or displaceable jack of correspondingly large dimensions, the motor vehicle being lifted and lifted Position is kept parallel to the floor level.
  • the invention now aims to develop and improve a mobile lifting platform of the type mentioned at the outset in such a way that the stability and safety is increased and in the raised state the ground clearance, ie the accessibility on the underside of the vehicle, is improved.
  • the device according to the invention should not only create the possibility of opening all doors without restriction, regardless of whether the vehicle is at the lowest or highest point on the stage, but it should also work on all units, such as exhaust, gearbox , Axle, cardan shaft, brakes or the like. be relieved.
  • the design according to the invention essentially consists in that the hydraulic cylinder-piston unit is mounted at a distance from the pivot axis of the lifting arm, which at maximum operating height of the support arms has a pivoting angle of the axis of the cylinder-piston unit to the ground plane between 75 ° and 105 °, preferably about 90 °, and that the lifting arm between the point of application of the cylinder-piston unit and the articulation point of the support arms essentially as to the free end of the same open U-beam is formed.
  • the reaction forces are better absorbed and greater stability is achieved. Since the cylinder-piston unit acts at a distance from the free end of the lifting arm, a space is created above the cylinder-piston unit, which improves the accessibility of the units, it being essential for improving the accessibility that the lifting arm between the point of application of the Cylinder-piston unit and the articulation point of the support arms is essentially designed as an open U-beam to the free end of the same.
  • Such a design of the upper end of the lifting arm, on which the support arms for supporting the base plate of the motor vehicle engage creates a corresponding free space, which enables cardan shafts and exhaust systems to be removed without obstruction by the lifting platform.
  • the training for improving the stability is such that the support arms at the free ends of the open U-beam are articulated in a manner known per se about an axis which is essentially normal to the plane of the floor and starting from this articulation point at an angle of at least 5 ° inclined are connected.
  • Such an angled arrangement of the support arms acting on the free end of the lifting arm in particular an appropriately cranked configuration, further increases the available space and further improves the accessibility of the units of a motor vehicle accessible from the underside of a motor vehicle.
  • the angling or cranking creates additional space and increases the stability of the support of the motor vehicle on the lifting platform.
  • the design is advantageously made such that a parallelogram link for the support arms is assigned to each U-leg of the lifting arm.
  • the arrangement of two parallelogram links makes it possible to dispense with connecting rods in the end region of the lifting arm and to separately guide the support arms, which each engage one of the free legs of the U-shaped support, in parallel. This in turn leads to an improvement in the accessibility of the units from the underside of the motor vehicle and to an increase in the available space.
  • a relatively high hydraulic pressure is required at the beginning of the lifting process in order to enable lifting.
  • the required hydraulic pressure in the hydraulic cylinder-piston unit drops.
  • Safety monitoring is advantageously possible with such a design if the design is such that the cylinder-piston unit is provided with an angular position transmitter and / or a pressure sensor for the hydraulic medium.
  • the angular position transmitter can be used in itself to limit the lifting movement of the lifting platform in order to prevent the lifting jack from being pivoted into an unstable position.
  • the method for lifting a motor vehicle with such a lifting platform can advantageously be carried out in accordance with the invention in such a way that the hydraulic medium supply is controlled as a function of the pressure in the cylinder-piston unit and is switched off when it drops to a predetermined minimum value. In this way it is ensured that a corresponding load is diverted into the hydraulic cylinder-piston unit even in the respectively raised position, whereby the stability of the lifting platform is ensured in every operating position.
  • FIG. 1 shows a schematic side view of a lifting platform according to the invention and FIG. 2 shows a partial view in the direction of arrow II of FIG. 1.
  • a hydraulic cylinder-piston unit 3 is pivotally supported on the base frame 1, the pivot axis 4 of which is lower than the pivot axis 5 of the lifting arm 6 for lifting a motor vehicle.
  • support arms 7 are attached, which act pivotably on the free end of the lifting arm 6 about a pivot axis 8 which is essentially normal to the floor level.
  • the bearing part 9, on which the support arms 7 pivotably engage, is held substantially parallel to the plane of the base frame even during the lifting process and in any position, for which purpose a parallelogram link 10 is provided, which acts on the bearing part 9 via an angle arm 11.
  • the drive motor for the hydraulics is designated by 12 in FIG.
  • the lifting platform is not yet at the nominal height, since the angle between the axis of the hydraulic cylinder-piston unit 3 and the plane given by the base frame is still less than 75 °.
  • the pressure in the hydraulic cylinder-piston unit 3 is larger than in a position in which the axis of the cylinder-piston unit 3 is at an angle of 75 ° to 105 ° to the level of the base frame and it can therefore be used to raise or raise the lift the pressure of the medium in hydraulic cylinder-piston unit are monitored by means of a schematically illustrated pressure sensor 13.
  • the further pressure medium supply is switched off. Since the pressure at the start of the lifting process is much greater than in the end position, it is in any case additionally desirable to provide an angular position sensor which engages on the pivot axis 4 and is indicated schematically by 14, which ensures that the correspondingly higher pressure is applied at the beginning of the lifting process Is made available and a pressure-dependent shutdown takes place only after reaching a predetermined minimum pivot position.
  • the hydraulic cylinder-piston unit 3 acts at a distance a from the free end of the lifting arm 6 on the lifting arm 6, which corresponds to approximately one third of the length of the lifting arm in the illustration in FIG. In this way it is possible to design the free end of the lifting arm 6 without loss of stability as an essentially U-shaped carrier, the free legs of which are denoted by 15 and 16.
  • the bearing part 9 for the support arms 7 is in turn connected to each of these free legs 15 and 16, and each of these two bearing parts 9 is guided parallel to the plane of the base frame 1 via a separate parallelogram rod 10. A corresponding free space thus remains between the two free legs 15 and 16 of the U-shaped carrier the expansion of cardan shafts, exhaust systems or the like. facilitated.
  • ramps and running surfaces 17 connected to the side of the base frame are indicated schematically.
  • the lifting arm 6 can be lowered by pivoting about the pivot axis 5 into a position between these lateral ramp parts or tread parts 17.

Abstract

A motor-vehicle hoist has a lifting arm (6) which is pivotably linked to a mobile base frame (1) and can be lowered into a position between side parts of the base frame (1) forming a ramp. Lateral supporting arms (7) which are guided parallel to the floor plane by a parallelogram link (10) are attached to the free end of the lifting arm (6). A hydraulic cylinder-piston unit (3) serves to pivot the lifting arm (6). The hydraulic cylinder-piston unit (3) is mounted at a distance from the pivot axis (5) of the lifting arm (6), which, at the maximum operating height of the supporting arms (7), produces a pivoting angle ( ) of the axis of the cylinder-piston unit (3) relative to the floor plane of between 75 DEG and 105 DEG . The cylinder- piston unit (3) acts at a distance from the free end of the lifting arm (6) which corresponds to at least 15% of the length of the lifting arm (6), and the lifting arm (6) is designed essentially as a channel section between the point of application of the cylinder-piston unit (3) and the articulation point of the supporting arms (7), which channel section is open towards the free end of the cylinder-piston unit (3). <IMAGE>

Description

Die Erfindung bezieht sich auf eine fahrbare Hebebühne zum Anheben von Kraftfahrzeugen mit einem schwenkbaren Hebearm, welcher an einem fahrbaren Grundrahmen schwenkbar angelenkt und in eine Position zwischen seitlichen, eine Auffahrrampe bildenden, Teilen des Grundrahmens absenkbar ist, wobei der Hebearm am freien Ende desselben seitliche Stützarme trägt, welche mit einem Parallelogrammlenker parallel zur Bodenebene geführt sind und der Hebearm mittels eines hydraulischen Zylinder-Kolbenaggregates schwenkbar ist, wobei das Zylinder-­Kolbenaggregat in einem Abstand vom freien Ende des Hebe­armes angreift, welcher wenigstens 15% der Länge des Hebe­armes entspricht,sowie auf ein Verfahren zum Anheben eines Kraftfahrzeuges mit einer derartigen Hebebühne.The invention relates to a mobile lifting platform for lifting motor vehicles with a pivotable lifting arm which is pivotably articulated on a movable base frame and can be lowered into a position between lateral parts of the base frame which form an access ramp, the lifting arm at the free end of the same lateral support arms carries, which are guided parallel to the floor level with a parallelogram and the lifting arm is pivotable by means of a hydraulic cylinder-piston unit, the cylinder-piston unit engages at a distance from the free end of the lifting arm, which corresponds to at least 15% of the length of the lifting arm, and on a method for lifting a motor vehicle with such a lifting platform.

Neben stationären Hebebühnen, bei welchen über zumeist vier an den Ecken einer Plattform angeordnete Hebeantriebe eine Plattform angehoben werden kann, sind verfahrbare Einrich­tungen zum Anheben von Kraftfahrzeugen bekanntgeworden, welche als Rangierwagenheber bezeichnet werden. Die erst­genannten stationären Einrichtungen zum Anheben von Kraft­fahrzeugen haben sich in Werkstätten bewährt und erlauben nach dem Anheben des Kraftfahrzeuges eine weitgehend freie Zugänglichkeit vieler Aggregate, insbesondere des Getriebes der Kardanwelle und des Auspuffes. Für Arbeiten im Bereich der Radaufhängung und der Bremsen von Kraftfahrzeugen ist es in der Regel erforderlich, die Räder von der Fahrebene abzuheben. Für derartige Arbeiten sind daher anders kon­struierte Wagenheber, beispielsweise die genannten Rangier­wagenheber besser geeignet, bei welchen das Kraftfahrzeug an entsprechend versteiften und stabilen Punkten seiner Karosserie angehoben werden kann, so das die Reifen von der Lauffläche abgehoben werden können.In addition to stationary lifting platforms, in which a platform can usually be raised via four lifting drives arranged at the corners of a platform, movable devices for lifting motor vehicles have become known, which are referred to as marshalling jacks. The first-mentioned stationary devices for lifting motor vehicles have proven themselves in workshops and, after lifting the motor vehicle, allow largely free access to many units, in particular the transmission of the cardan shaft and the exhaust. For work in the area of the wheel suspension and the brakes of motor vehicles, it is usually necessary to lift the wheels off the driving level. For this type of work, differently constructed jacks, for example the aforementioned jacking jacks, are more suitable, in which the motor vehicle can be raised at correspondingly stiffened and stable points on its body, so that the tires can be lifted off the tread.

Um ein vollständiges Anheben eines Kraftfahrzeuges mit derartigen Rangierwagenhebern zu erzielen, sind vier der­artige Wagenheber erforderlich. Ein koordiniertes Anheben, bei welchem das Fahrzeug parallel zur Bodenebene angehoben wird, läßt sich mit derartigen einzelnen Wagenhebern nicht ohne weiteres erzielen.In order to achieve complete lifting of a motor vehicle with such jack jacks, four jacks of this type are required. Coordinated lifting, in which the vehicle is raised parallel to the floor level, cannot be easily achieved with such individual jacks.

Gemäß einer beispielsweise aus der GB-PS 2 188 610 bekannt­gewordenen Konstruktion wurde nun eine fahrbare Hebebühne ge­schaffen, bei welcher mit einem einzigen verfahrbaren bzw. verschiebbaren entsprechend groß dimensionierten Wagenheber das Anheben eines Kraftfahrzeuges möglich ist, wobei das Kraftfahrzeug während des Hebevorganges und in der ange­hobenen Lage parallel zur Bodenebene gehalten ist.According to a construction which has become known, for example, from GB-PS 2 188 610, a mobile lifting platform has now been created in which the lifting of a motor vehicle is possible with a single movable or displaceable jack of correspondingly large dimensions, the motor vehicle being lifted and lifted Position is kept parallel to the floor level.

Die Erfindung zielt nun darauf ab, eine fahrbare Hebebühne der eingangs genannten Art dahingehend weiterzubilden und zu verbessern, daß die Stabilität und Sicherheit erhöht wird und in angehobenem Zustand die Bodenfreiheit, d.h. die Zugäng­lichkeit an der Fahrzeugunterseite verbessert wird. Es soll somit mit der erfindungsgemäßen Einrichtung nicht nur die Möglichkeit geschaffen werden alle Türen ohne Einschränkung zu öffnen und dies unabhängig ob sich das Fahrzeug am tief­sten oder höchsten Punkt der Bühne befindet, sondern es soll weiters auch das Arbeiten an allen Aggregaten, wie Auspuff, Getriebe, Achse, Kardanwelle, Bremsen od.dgl. erleichtert werden. Zur Lösung dieser Aufgabe und zur Erhöhung der Stabilität der Hebebühne besteht die erfindungsgemäße Ausbil­dung im wesentlichen darin, daß das hydraulische Zylinder-­Kolbenaggregat in einem Abstand von der Schwenkachse des Hebearms gelagert ist, welcher bei maximaler Betriebshöhe der Stützarme einen Schwenkwinkel der Achse des Zylinder-Kolben­aggregates zur Bodenebene zwischen 75° und 105°, vorzugsweise etwa 90°, ergibt, und daß der Hebearm zwischen der Angriff­stelle des Zylinder-Kolbenaggregates und der Anlenkstelle der Stützarme in wesentlichen als zum freien Ende desselben offener U-Träger ausgebildet ist. Dadurch, daß das Zylinder-­Kolbenaggregat zum Anheben des Hebearmes in der Nenn­betriebshöhe der hebebühne unter einem Winkel von 75° bis 105° zur Bodenebene steht, werden die Reaktionskräfte besser aufgenommen und es wird eine größere Stabilität erzielt. Da das Zylinder-Kolbenaggregat in einem Abstand vom freien Ende des Hebearmes angreift, wird oberhalb des Zylinder-Kolben­aggregates ein Platz geschaffen, welcher die Zugänglichkeit der Aggregate verbessert, wobei es zur Verbesserung der Zugänglichkeit von wesentlicher Bedeutung ist, daß der Hebearm zwischen der Angriffstelle des Zylinder-Kolben­aggregates und der Anlenkstelle der Stützarme im wesentlichen als zum freien Ende desselben offener U-Träger ausgebildet ist. Eine derartige Ausbildung des oberen Endes des Hebe­armes, an welchem die Stützarme für das Abstützen der Boden­platte des Kraftfahrzeuges angreifen, schafft einen entspre­chenden Freiraum, welcher es ermöglicht, daß Kardanwellen und Auspuffanlagen ohne Behinderung durch die Hebebühne ausgebaut werden können.The invention now aims to develop and improve a mobile lifting platform of the type mentioned at the outset in such a way that the stability and safety is increased and in the raised state the ground clearance, ie the accessibility on the underside of the vehicle, is improved. Thus, the device according to the invention should not only create the possibility of opening all doors without restriction, regardless of whether the vehicle is at the lowest or highest point on the stage, but it should also work on all units, such as exhaust, gearbox , Axle, cardan shaft, brakes or the like. be relieved. To solve this problem and to increase the stability of the lifting platform, the design according to the invention essentially consists in that the hydraulic cylinder-piston unit is mounted at a distance from the pivot axis of the lifting arm, which at maximum operating height of the support arms has a pivoting angle of the axis of the cylinder-piston unit to the ground plane between 75 ° and 105 °, preferably about 90 °, and that the lifting arm between the point of application of the cylinder-piston unit and the articulation point of the support arms essentially as to the free end of the same open U-beam is formed. Because the cylinder-piston unit for lifting the lifting arm at the nominal operating height of the lifting platform is at an angle of 75 ° to 105 ° to the floor level, the reaction forces are better absorbed and greater stability is achieved. Since the cylinder-piston unit acts at a distance from the free end of the lifting arm, a space is created above the cylinder-piston unit, which improves the accessibility of the units, it being essential for improving the accessibility that the lifting arm between the point of application of the Cylinder-piston unit and the articulation point of the support arms is essentially designed as an open U-beam to the free end of the same. Such a design of the upper end of the lifting arm, on which the support arms for supporting the base plate of the motor vehicle engage, creates a corresponding free space, which enables cardan shafts and exhaust systems to be removed without obstruction by the lifting platform.

Mit Vorteil ist die Ausbildung zur Verbesserung der Stabi­lität so getroffen, daß die Stützarme an den freien Enden des offenen U-Trägers in an sich bekannter Weise um eine zur Bodenebene im wesentlichen normale Achse schwenkbar angelenkt sind und ausgehend von dieser Anlenkstelle unter einem Winkel von wenigstens 5° aufwärts geneigt angeschlossen sind. Eine derartige abgewinkelte Anordnung der am freien Ende des Hebearmes angreifenden Stützarme, insbesondere eine entspre­chend gekröpfte Ausbildung vergrößert nochmals den zur Verfügung stehenden Freiraum und verbessert weiter die Zugänglichkeit der von der Unterseite eines Kraftfahrzeuges zugänglichen Aggregate eines Kraftfahrzeuges. Die Abwinkelung bzw. Kröpfung schafft hiebei zusätzlichen Freiraum und erhöht die Stabilität der Auflage des Kraftfahrzeuges auf der Hebebühne.Advantageously, the training for improving the stability is such that the support arms at the free ends of the open U-beam are articulated in a manner known per se about an axis which is essentially normal to the plane of the floor and starting from this articulation point at an angle of at least 5 ° inclined are connected. Such an angled arrangement of the support arms acting on the free end of the lifting arm, in particular an appropriately cranked configuration, further increases the available space and further improves the accessibility of the units of a motor vehicle accessible from the underside of a motor vehicle. The angling or cranking creates additional space and increases the stability of the support of the motor vehicle on the lifting platform.

Um den Freiraum zwischen den Schenkeln des offenen U-trägers im freien Endbereich des Hebearmes in keiner Weise zu beein­trächtigen, ist mit Vorteil die Ausbildung so getroffen, daß je ein Parallelogrammlenker für die Stützarme jedem U-Schen­kel des Hebearmes zugeordnet ist. Die Anordnung von zwei Parallelogrammlenkern erlaubt es auf Verbindungsgestänge im Endbereich des Hebearmes zu verzichten und die Stützarme, welche jeweils an einem der freien Schenkel des U-förmigen Trägers angreifen, gesondert parallel zu führen. Dies führt wiederum zu einer Verbesserung der Zugänglichkeit der Aggre­gate von der Unterseite des Kraftfahrzeuges und zur Erhöhung des zur Verfügung stehenden Freiraumes.In order not to impair the free space between the legs of the open U-beam in the free end region of the lifting arm, the design is advantageously made such that a parallelogram link for the support arms is assigned to each U-leg of the lifting arm. The arrangement of two parallelogram links makes it possible to dispense with connecting rods in the end region of the lifting arm and to separately guide the support arms, which each engage one of the free legs of the U-shaped support, in parallel. This in turn leads to an improvement in the accessibility of the units from the underside of the motor vehicle and to an increase in the available space.

Bedingt durch die Kinematik des Antriebes und die Verschwen­kung des hydraulischen Zylinder-Kolbenaggregates ausgehend von einer zur Bodenebene hin verschwenkten Lage in eine im wesentlichen auf die Bodenebene normale Stützlage, ist am Beginn des Hebevorganges ein relativ hoher Hydraulikdruck erforderlich, um das Anheben zu ermöglichen. Im Zuge des Anhebevorganges sinkt nun der erforderliche Hydraulikdruck im hydraulischen Zylinder-Kolbenaggregat ab. Eine Sicherheits­überwachung ist mit Vorteil bei einer derartigen Ausbildung dann möglich, wenn die Ausbildung so getroffen ist, daß das Zylinder-Kolbenaggregat mit einem Winkelstellungsgeber und/oder einem Druckaufnehmer für das Hydraulikmedium ver­sehen ist. Der Winkelstellungsgeber kann für sich genommen für die Begrenzung der Hubbewegung der Hebebühne herangezogen werden um zu verhindern, daß der Hebebock in eine instabile Position verschwenkt werden kann. Wenn zusätzlich ein Druck­aufnehmer für das Hydraulikmedium vorgesehen ist, kann auch der beim Anheben absinkende Hydraulikdruck überwacht werden um sicherzustellen, daß ein Absinken des Hydraulikdruckes nicht auf unzulässig niedrige und damit entsprechend in­stabile Werte erfolgen kann. Das Verfahren zum Anheben eines Kraftfahrzeuges mit einer derartigen Hebebühne ist aus diesem Grunde gemäß der Erfindung mit Vorteil so durchzuführen, daß die Hydraulikmittelzufuhr in Abhängigkeit vom Druck im Zylinder-Kolbenaggregat gesteuert wird und bei Absinken auf einen vorbestimmten Mindestwert abgeschaltet wird. Auf diese Weise wird sichergestellt, daß auch in der jeweils ange­hobenen Position eine entsprechende Belastung in das hydrau­lische Zylinder-Kolbenaggregat abgeleitet wird, wodurch die Stabilität der Hebebühne in jeder Betriebslage gewährleistet ist.Due to the kinematics of the drive and the pivoting of the hydraulic cylinder-piston unit, starting from a position pivoted towards the floor level into a support position that is essentially normal to the floor level, a relatively high hydraulic pressure is required at the beginning of the lifting process in order to enable lifting. In the course of the lifting process, the required hydraulic pressure in the hydraulic cylinder-piston unit drops. Safety monitoring is advantageously possible with such a design if the design is such that the cylinder-piston unit is provided with an angular position transmitter and / or a pressure sensor for the hydraulic medium. The angular position transmitter can be used in itself to limit the lifting movement of the lifting platform in order to prevent the lifting jack from being pivoted into an unstable position. If a pressure sensor for the hydraulic medium is additionally provided, the hydraulic pressure falling when lifting can also be monitored to ensure that the hydraulic pressure cannot drop to inadmissibly low and therefore unstable values. For this reason, the method for lifting a motor vehicle with such a lifting platform can advantageously be carried out in accordance with the invention in such a way that the hydraulic medium supply is controlled as a function of the pressure in the cylinder-piston unit and is switched off when it drops to a predetermined minimum value. In this way it is ensured that a corresponding load is diverted into the hydraulic cylinder-piston unit even in the respectively raised position, whereby the stability of the lifting platform is ensured in every operating position.

Die Erfindung wird nachfolgend an Hand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher er­läutert. In dieser zeigen Fig.1 eine schematische Seiten­ansicht einer erfindungsgemäßen Hebebühne und Fig.2 eine Teilansicht in Richtung des Pfeiles II der Fig.1.The invention is explained in more detail below on the basis of an exemplary embodiment schematically illustrated in the drawing. 1 shows a schematic side view of a lifting platform according to the invention and FIG. 2 shows a partial view in the direction of arrow II of FIG. 1.

In Fig.1 ist ein fahrbarer Grundrahmen 1 dargestellt, an welchem Rollen 2 zum Verschieben bzw. Verfahren des Grund­rahmens festgelegt sind. Am Grundrahmen 1 ist schwenkbar ein hydraulisches Zylinder-Kolbenaggregat 3 abgestützt, dessen Schwenkachse 4 tiefer liegt als die Schwenkachse 5 des Hebearmes 6 zum Anheben eines Kraftfahrzeuges. Am freien Ende des Hebearmes 6 sind Stützarme 7 angeschlagen, welche um eine auf die Bodenebene im wesentlichen normale Schwenkachse 8 schwenkbar am freien Ende des Hebearmes 6 angreifen. Der Lagerteil 9, an welchem die Stützarme 7 schwenkbar angreifen, wird selbst während des Hebevorganges und in jeder beliebigen Position im wesentlichen parallel zur Ebene des Grundrahmens gehalten, wofür ein Parallelogrammlenker 10 vorgesehen ist, welcher über einen Winkelarm 11 am Lagerteil 9 angreift.1 shows a mobile base frame 1, on which rollers 2 for moving or moving the base frame are fixed. A hydraulic cylinder-piston unit 3 is pivotally supported on the base frame 1, the pivot axis 4 of which is lower than the pivot axis 5 of the lifting arm 6 for lifting a motor vehicle. At the free end of the lifting arm 6 support arms 7 are attached, which act pivotably on the free end of the lifting arm 6 about a pivot axis 8 which is essentially normal to the floor level. The bearing part 9, on which the support arms 7 pivotably engage, is held substantially parallel to the plane of the base frame even during the lifting process and in any position, for which purpose a parallelogram link 10 is provided, which acts on the bearing part 9 via an angle arm 11.

Der Antriebsmotor für die Hydraulik ist in Fig.1 mit 12 bezeichnet. In der Darstellung nach Fig.1 befindet sich die Hebebühne noch nicht auf Nennhöhe, da der Winkel zwischen der Achse des hydraulischen Zylinder-Kolbenaggregates 3 und der durch den Grundrahmen gegebenen Ebene noch kleiner als 75° ist. In einer derartigen Schwenklage ist der Druck im hydraulischen Zylinder-Kolbenaggregat 3 größer als in einer Lage, bei welcher die Achse des Zylinder-Kolbenaggregates 3 in einem Winkel von 75° bis 105° zur Ebene des Grundrahmens steht und es kann daher zum Hochfahren bzw. Anheben der Hebebühne der Druck des Mediums im hydraulischen Zylinder-­Kolbenaggregat mittels eines schematisch dargestellten Drucksensors 13 überwacht werden. Sobald der Druck auf ein vorbestimmtes Sicherheitsniveau abgesunken ist, wird die weitere Druckmittelzufuhr abgeschaltet. Da der Druck am Beginn des Hebevorganges wesentlich größer ist als in der Endlage, ist es in jedem Falle zusätzlich wünschenswert, einen an der Schwenkachse 4 angreifenden und mit 14 schema­tisch angedeuteten Winkelstellungsgeber vorzusehen, welcher sicherstellt, daß zu Beginn des Hebervorganges der entspre­chend höhere Druck zur Verfügung gestellt wird und ein druckabhängiges Abschalten erst nach Erreichen einer vorbe­stimmten Mindestschwenklage erfolgt.The drive motor for the hydraulics is designated by 12 in FIG. In the illustration according to FIG. 1, the lifting platform is not yet at the nominal height, since the angle between the axis of the hydraulic cylinder-piston unit 3 and the plane given by the base frame is still less than 75 °. In such a swivel position, the pressure in the hydraulic cylinder-piston unit 3 is larger than in a position in which the axis of the cylinder-piston unit 3 is at an angle of 75 ° to 105 ° to the level of the base frame and it can therefore be used to raise or raise the lift the pressure of the medium in hydraulic cylinder-piston unit are monitored by means of a schematically illustrated pressure sensor 13. As soon as the pressure has dropped to a predetermined safety level, the further pressure medium supply is switched off. Since the pressure at the start of the lifting process is much greater than in the end position, it is in any case additionally desirable to provide an angular position sensor which engages on the pivot axis 4 and is indicated schematically by 14, which ensures that the correspondingly higher pressure is applied at the beginning of the lifting process Is made available and a pressure-dependent shutdown takes place only after reaching a predetermined minimum pivot position.

Bei der Darstellung nach Fig.2 ist nun der Endbereich des Hebearmes 6 deutlicher gezeigt und es ist besser ersichtlich, durch welche Maßnahmen die Zugänglichkeit von Aggregaten an der Unterseite eines Kraftfahrzeuges erleichtert wird. Das hydraulische Zylinder-Kolbenaggregat 3 greift in einem Abstand a vom freien Ende des Hebearmes 6 am Hebearm 6 an, welcher bei der Darstellung in Fig.2 etwa einem Drittel der Länge des Hebearmes entspricht. Auf diese Weise wird es ermöglicht das freie Ende des Hebearmes 6 ohne Verlust an Stabilität als im wesentlichen U-förmiger Träger auszubilden, dessen freie Schenkel mit 15 und 16 bezeichnet sind. An jedem dieser freien Schenkel 15 und 16 ist wiederum der Lagerteil 9 für die Stützarme 7 angeschlossen und jeder dieser beiden Lagerteile 9 ist über eine gesonderte Parallelogrammstange 10 relativ zur Ebene des Grundrahmens 1 parallel geführt. Zwischen den beiden freien Schenkeln 15 und 16 des U-förmigen Trägers verbleibt somit ein entsprechender Freiraum, welcher den Ausbau von Kardanwellen, Auspuffanlagen od.dgl. erleich­tert.In the illustration according to FIG. 2, the end region of the lifting arm 6 is now shown more clearly and it can be seen more clearly by what measures the accessibility of units on the underside of a motor vehicle is facilitated. The hydraulic cylinder-piston unit 3 acts at a distance a from the free end of the lifting arm 6 on the lifting arm 6, which corresponds to approximately one third of the length of the lifting arm in the illustration in FIG. In this way it is possible to design the free end of the lifting arm 6 without loss of stability as an essentially U-shaped carrier, the free legs of which are denoted by 15 and 16. The bearing part 9 for the support arms 7 is in turn connected to each of these free legs 15 and 16, and each of these two bearing parts 9 is guided parallel to the plane of the base frame 1 via a separate parallelogram rod 10. A corresponding free space thus remains between the two free legs 15 and 16 of the U-shaped carrier the expansion of cardan shafts, exhaust systems or the like. facilitated.

Bei der Darstellung nach Fig.2 sind seitlich am Grundrahmen angeschlossene Auffahrrampen und Laufflächen 17 schematisch angedeutet. Der Hebearm 6 kann durch Verschwenken um die Schwenkachse 5 in eine Position zwischen diesen seitlichen Rampenteilen bzw. Laufflächenteilen 17 abgesenkt werden.In the representation according to FIG. 2, ramps and running surfaces 17 connected to the side of the base frame are indicated schematically. The lifting arm 6 can be lowered by pivoting about the pivot axis 5 into a position between these lateral ramp parts or tread parts 17.

Claims (5)

1. Fahrbare Hebebühne zum Anheben von Kraftfahrzeugen mit einem schwenkbaren Hebearm, welcher an einem fahrbaren Grund­rahmen (1) schwenkbar angelenkt und in eine Position zwischen seitlichen, eine Auffahrrampe bildenden, Teilen des Grund­rahmens (1) absenkbar ist, wobei der Hebearm (6) am freien Ende desselben seitliche Stützarme (7) trägt, welche mit einem Parallelogrammlenker (10) parallel zur Bodenebene geführt sind und der Hebearm (6) mittels eines hydraulischen Zylinder-Kolbenaggregates (3) schwenkbar ist, wobei das Zylinder-Kolbenaggregat (3) in einem Abstand vom freien Ende des Hebearmes (6) angreift, welcher wenigstens 15% der Länge des Hebearmes entspricht, dadurch gekennzeichnet, daß das hydraulische Zylinder-Kolbenaggregat (3) in einem Abstand von der Schwenkachse (5) des Hebearms (6) gelagert ist, welcher bei maximaler Betriebshöhe der Stützarme (7) einen Schwenk­winkel der Achse des Zylinder-Kolbenaggregates (3) zur Bodenebene zwischen 75° und 105°, vorzugsweise etwa 90°, ergibt, und daß der Hebearm (6) zwischen der Angriffstelle des Zylinder-Kolbenaggregates (3) und der Anlenkstelle der Stützarme (7) im wesentlichen als zum freien Ende desselben offener U-Träger ausgebildet ist.1. Mobile lifting platform for lifting motor vehicles with a pivotable lifting arm, which is pivotably articulated on a movable base frame (1) and can be lowered into a position between lateral parts of the base frame (1) forming an access ramp, the lifting arm (6) on Free end of the same carries lateral support arms (7), which are guided parallel to the floor level with a parallelogram link (10) and the lifting arm (6) can be pivoted by means of a hydraulic cylinder-piston unit (3), the cylinder-piston unit (3) in one Distance from the free end of the lifting arm (6) which corresponds to at least 15% of the length of the lifting arm, characterized in that the hydraulic cylinder-piston unit (3) is mounted at a distance from the pivot axis (5) of the lifting arm (6), which, at the maximum operating height of the support arms (7), has a pivoting angle of the axis of the cylinder-piston unit (3) to the ground plane between 75 ° and 105 °, preferably about 90 °, results, and that the lifting arm (6) between the point of application of the cylinder-piston unit (3) and the articulation point of the support arms (7) is essentially designed as an open U-beam to the free end of the same. 2. Hebebühne nach Anspruch 1, dadurch gekennzeichnet, daß die Stützarme (7) an den freien Enden (15,16) des offenen U-Trägers in an sich bekannter Weise un eine zur Bodenebene im wesentlichen normale Achse (8) schwenkbar angelenkt sind und ausgehend von dieser Anlenkstelle unter einem Winkel von wenigstens 5° aufwärts geneigt angeschlossen sind.2. Lifting platform according to claim 1, characterized in that the support arms (7) at the free ends (15, 16) of the open U-beam are articulated in a manner known per se and an axis (8) which is essentially normal to the floor level and starting from this articulation point are connected inclined at an angle of at least 5 ° upwards. 3. Hebebühne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß je ein Parallelogrammlenker (10) für die Stützarme (7) jedem U-Schenkel (15,16) des Hebearmes (6) zugeordnet ist.3. Lifting platform according to claim 1 or 2, characterized in that a parallelogram link (10) for the support arms (7) is assigned to each U-leg (15, 16) of the lifting arm (6). 4. Hebebühne nach Anspruch 1, 2 oder 3, dadurch gekennzeich­net, daß das Zylinder-Kolbenaggregat (3) mit einem Winkel­stellungsgeber (4) und/oder einem Druckaufnehmer (13) für das Hydraulikmedium versehen ist.4. Lifting platform according to claim 1, 2 or 3, characterized in that the cylinder-piston unit (3) is provided with an angular position transmitter (4) and / or a pressure sensor (13) for the hydraulic medium. 5. Verfahren zum Anheben eines Kraftfahrzeuges mit einer Hebebühne nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß die Hydraulikmittelzufuhr in Abhängigkeit vom Druck im Zylinder-Kolbenaggregat (3) gesteuert wird und bei Absinken auf einen vorbestimmten Mindestwert abgeschaltet wird.5. A method for lifting a motor vehicle with a lifting platform according to one of claims 1 to 4, characterized in that the hydraulic medium supply is controlled as a function of the pressure in the cylinder-piston unit (3) and is switched off when it drops to a predetermined minimum value.
EP89890095A 1988-04-07 1989-04-06 Mobile vehicle hoist Expired - Lifetime EP0336927B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT905/88 1988-04-07
AT90588 1988-04-07

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EP0336927A1 true EP0336927A1 (en) 1989-10-11
EP0336927B1 EP0336927B1 (en) 1992-11-25

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EP89890095A Expired - Lifetime EP0336927B1 (en) 1988-04-07 1989-04-06 Mobile vehicle hoist

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US (1) US5025892A (en)
EP (1) EP0336927B1 (en)
AT (1) ATE82737T1 (en)
CA (1) CA1318312C (en)
DE (1) DE58902797D1 (en)

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WO1995004698A1 (en) * 1993-08-10 1995-02-16 Ackermann Inter Ltd Flat-structure lifting platform
CN103507872A (en) * 2013-09-18 2014-01-15 立马车业集团有限公司 Vehicle frame assembling and conveying line
DE102016002924A1 (en) * 2016-03-04 2017-09-07 Ventzki Handling Systems Gmbh & Co. Kg hoist
WO2018189139A1 (en) * 2017-04-13 2018-10-18 Finkbeiner, Gerhard Lifting platform
WO2020248652A1 (en) * 2019-06-10 2020-12-17 乐歌人体工学科技股份有限公司 Balance adjustment method for lifting platform
DE102020205451A1 (en) 2020-04-29 2021-11-04 Volkswagen Aktiengesellschaft Mobile lifting device

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US5340082A (en) * 1992-03-30 1994-08-23 Delaware Capital Formation, Inc. Portable surface lift for a vehicle
US6241049B1 (en) * 1998-05-26 2001-06-05 William C. Gooch Apparatus for storing vehicles with multiple support platforms, collapsible supports between platforms, and a torque-reaction arm lift system
DE19839835A1 (en) * 1998-09-02 2000-03-16 Gerhard Finkbeiner Lifting device
US6644615B1 (en) 2002-07-03 2003-11-11 Larin Corporation Stabilized jack stand
US7360983B2 (en) * 2003-04-04 2008-04-22 Pate Buck A Portable elevated vehicle display
US7509187B2 (en) * 2005-02-28 2009-03-24 The Braun Corporation Wheelchair lift with a rotary sensor used to determine lift position
US20060245873A1 (en) * 2005-03-31 2006-11-02 Black Jim D Snowmobile lifting device
US10377611B2 (en) * 2016-10-28 2019-08-13 Advance Lifts, Inc. Scissors lift with height sensor system

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US5613575A (en) * 1993-08-10 1997-03-25 Ackermann Inter Ltd. Flat-structure lifting platform
CN103507872A (en) * 2013-09-18 2014-01-15 立马车业集团有限公司 Vehicle frame assembling and conveying line
CN103507872B (en) * 2013-09-18 2016-05-18 立马车业集团有限公司 Frame Assembling pipeline
DE102016002924A1 (en) * 2016-03-04 2017-09-07 Ventzki Handling Systems Gmbh & Co. Kg hoist
WO2018189139A1 (en) * 2017-04-13 2018-10-18 Finkbeiner, Gerhard Lifting platform
US11655129B2 (en) 2017-04-13 2023-05-23 Gerhard Finkbeiner Lifting platform
WO2020248652A1 (en) * 2019-06-10 2020-12-17 乐歌人体工学科技股份有限公司 Balance adjustment method for lifting platform
DE102020205451A1 (en) 2020-04-29 2021-11-04 Volkswagen Aktiengesellschaft Mobile lifting device

Also Published As

Publication number Publication date
CA1318312C (en) 1993-05-25
EP0336927B1 (en) 1992-11-25
ATE82737T1 (en) 1992-12-15
US5025892A (en) 1991-06-25
DE58902797D1 (en) 1993-01-07

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