WO2000003942A2 - Lowering brake device for hydraulic elevating platforms - Google Patents

Lowering brake device for hydraulic elevating platforms Download PDF

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Publication number
WO2000003942A2
WO2000003942A2 PCT/DE1999/002166 DE9902166W WO0003942A2 WO 2000003942 A2 WO2000003942 A2 WO 2000003942A2 DE 9902166 W DE9902166 W DE 9902166W WO 0003942 A2 WO0003942 A2 WO 0003942A2
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WO
WIPO (PCT)
Prior art keywords
lowering
working platform
brake device
platform
height
Prior art date
Application number
PCT/DE1999/002166
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German (de)
French (fr)
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WO2000003942A3 (en
Inventor
Rudolf Lehnert
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Rudolf Lehnert
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Publication of WO2000003942A2 publication Critical patent/WO2000003942A2/en
Publication of WO2000003942A3 publication Critical patent/WO2000003942A3/en

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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
    • 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
    • B66F7/0641—Single levers, e.g. parallel links

Definitions

  • the invention describes a lowering brake device for hydraulic lifts with parallel adjustment of the work or footprint. Such lifts are used for. B. used for lifting two-wheelers, such as motorcycles and scooters.
  • the parking area is shifted over two parallel link rods relative to the base of the lift frame so that the work platform remains parallel to the base of the frame at all times.
  • the work surface is moved by means of a built-in hydraulic cylinder, which is located between the base frame and the linkage rods of the work surface.
  • the force triangle resulting from the articulation points of the hydraulic cylinder on the base frame as well as the fastening point on the base frame and the connection point of the hydraulic cylinder with the articulation rod represents the force relationships in the adjusting device of the lifting platform at every point in time when the work platform is adjusted.
  • the baseline of the power triangle is unchangeable and becomes formed by the two articulation points of the hydraulic cylinder and the articulation rod on the base frame.
  • the side line of the power triangle formed by the attachment of the link rod to the base frame and the connection point of the hydraulic cylinder with the link rod also remains constant over the entire adjustment range of the lift.
  • the force triangle forms a degenerate triangle, the height of which is very low and the two base angles, which are formed by the base line and the two side lines that act as legs, are negligibly small compared to the one from the two Legs formed by the triangle.
  • the piston rod of the cylinder When lowering the work surface from the highest adjustment position to the basic position, the piston rod of the cylinder is retracted by opening the lowering valve of the hydraulic cylinder.
  • the lowering speed depends on the opening size of the lowering valve. If the opening position remains constant over the entire travel distance of the work surface between the highest end position and the basic position, the lowering speed of the work platform changes depending on the height of the work platform and thus causally on the type and the geometric structure of the force triangle.
  • the lowering valve In the highest working position of the work platform, the lowering valve must be opened wide in order to quickly lower the Ensure working platform. However, if the work platform approaches its lower basic position, a small travel of the hydraulic piston causes a large change in the height of the work platform. This leads to the fact that when the lowering valve is open, the working platform almost falls into the rest position and, because of the small angles that result between the base frame, the work surface and the connecting rods, there are clamping points which can lead to accidents.
  • the invention has for its object to show a braking device for a hydraulic lifting platform, which only allows a maximum open position of the lowering valve of the hydraulic cylinder regardless of the pedal adjustment path of the operator and also brakes the increasing lowering speed of the working platform with parallel linkage lifting platforms when the lower rest position is reached.
  • the actuating device for opening the lowering brake valve of the hydraulic cylinder can be decoupled from the pedal position of the operator.
  • the lowering valve is closed in the rest position of the lowering pedal.
  • a preferred embodiment of the invention is that the lowering speed of the working platform along the entire travel path of the working platform from the highest position to the lower basic position can be changed via a link rail depending on the height of the working platform and can thus be adapted to the respective potential hazards.
  • the invention is described in more detail below with the aid of an exemplary embodiment. The execution is shown by the following pictures:
  • Fig. 1 shows a side view of a hydraulic lifting platform with the working platform in its highest position
  • Fig. 2 shows schematically the actuating device for lowering the working platform via a foot pedal
  • FIG. 1 the schematic structure of a hydraulic lift is shown.
  • the base frame 1 is constructed so that it can be attached to the floor by various means.
  • the two pairs of link rods 3 and 3 are mounted as far apart as possible, which support the working surface 2 of the lifting platform.
  • the work platform is lowered and raised via these link rods 3 and 3.
  • the hydraulic cylinder 4 is located between the base frame 1 and the coupling rod pair 3 ' .
  • This cylinder 4 is fastened to the base frame 1 by means of a bolt 5.
  • the piston rod 6 of the cylinder 4 is connected to the articulation rod 3 by means of a pin 8 by means of the pin 8.
  • the link rods 3 and 3 ⁇ are coupled to the base frame 1 via the axes 9 and 9 and to the work surface 2 via the axes 10 and 10 ' .
  • the locking link pair 11 is connected via the axis 12 to the link rod 3 ⁇ .
  • the crossbar 13 of the locking link pair 11 engages via pins 15 (see FIG. 2) at both ends of the crossbar 13 in a link rail 14 which is fastened to the base frame.
  • the link rail 14 has a sawtooth-like appearance, the teeth being strongly rounded and pointing in the direction of the linkage rod 3 ′ in order to prevent the work platform 2 from being lowered unintentionally.
  • the lowering valve is closed when lifting the work surface 2 via the hydraulic cylinder 4, can a leak in the cylinder or an inadvertent actuation of the lowering valve lowers the work platform. This is prevented by the pair of latching links 1 1, since when the working surface 2 is inadvertently lowered, the pins 15 snap into the recesses 16 in the link rail 14.
  • the adjusting device for the lowering pedal 19 is shown in FIG.
  • the pedal to be actuated by foot pressure is mounted on the adjusting shaft 17 for the lowering valve 21 of the hydraulic cylinder 4.
  • the adjusting shaft 17 is connected to the lowering pedal 19 via a spiral spring 18. If the lowering pedal 19 is actuated, the adjusting shaft 17 is rotated via the spring 18 and the lowering valve 21 is opened. At the same time, the locking link pair 11 is lifted out of the locking position of the link rail 14 by means of the adjusting plate 22 attached to the adjusting shaft 17, so that the pins 15 of the locking link pair 11 are above the recesses of the link rail 14. As a result, the work platform 2 already sinks into its lower rest position due to its own weight.
  • the lowering valve 21 of the hydraulic cylinder 4 is automatically closed when the lowering pedal 19 is released, thus preventing a further lowering of the working platform 2. Even if the lowering valve 21 fails as a result of leaks, the working platform remains at the desired height, since the return shaft 25 rotates the adjusting shaft 17, so that the two locking pins 15 snap into one of the recesses in the link rail 14 and thus further lower the working platform 2 prevent.
  • the lowering speed of the work platform 2 can be set via the travel of the locking pin 15 and thus the height position of the work platform 2.
  • the lowering valve is closed by the smallest possible distance between the link rail 14 and the stop plate 23, and thus the lowering speed of the working platform 2 is slowed down in order to avoid unintentional jamming. It can be limited by the shape of the stop plate 23 and the resulting distance of the stop plate 23 from the link rail 14, the lowering speed of the work platform 2 depending on the height of the work platform.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Braking Arrangements (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

The invention relates to a lowering brake device for a hydraulic elevating platform, wherein the working platform (2) is moved by a parallel suspension arm arrangement and the position of the lowering valve (21) is decoupled from the position of the control pedal (19) for the lowering valve (21) when the working platform (2) is being lowered by opening the lowering valve (21) of the hydraulic cylinder (4). In order to throttle the lowering speed of the working platform (2) when the lower resting position of the working platform (2) is reached, the position of the lowering valve (21) is regulated depending on the altitude of the working platform (2) thereby complying with safety requirements. Opening of the lowering valve (21) is controlled by a regulating shaft (17) which regulates the opened state of the lowering valve (21) depending on the altitude of the working platform (2).

Description

Senkbremseinrichtung für hydraulische Hebebühnen Lowering brake device for hydraulic lifts
Beschreibungdescription
Die Erfindung beschreibt eine Senkbremseinrichtung für hydraulische Hebebühnen mit Parallelverstellung derArbeits- oder Stellfläche. Derartige Hebebühnen werden z. B. zum Heben von Zweirädem, wie Motorräder und Motorroller benutzt.The invention describes a lowering brake device for hydraulic lifts with parallel adjustment of the work or footprint. Such lifts are used for. B. used for lifting two-wheelers, such as motorcycles and scooters.
Bei hydraulischen Hebebühnen mit Parallelverstellung der Absteilfläche wird die Abstellfläche über zwei parallele Anlenkstangen gegenüber der Grundfläche des Hebebühnenrahmens derart verschoben, daß die Arbeitsbühne zu jedem Zeitpunkt parallel zur Grundfläche des Rahmens bleibt. Bei hydraulisch verstellbaren Hebebühnen wird die Arbeitsfläche mittels eingebautem Hydraulikzylinder, der sich dem zwischen Grundrahmen und den Anlenkstangen der Arbeitsfläche befindet, bewegt. Das sich aus den Anlenkpunkten des Hydraulikzylinders am Grundrahmen sowie des Befestigungspunktes am Grundrahmen und der Verbindungsstelle des Hydraulikzylinders mit der Anlenkstange ergebende Kraftdreieck, stellt zu jedem Zeitpunkt der Verstellung der Arbeitsbühne die Kraftverhältnisse in der Versteileinrichtung der Hebebühne dar. Die Grundlinie des Kraftdreiecks ist unveränderlich und wird durch die beiden Anlenkpunkte des Hydraulikzylinders und der Anlenkstange an den Grundrahmen gebildet. Die durch die Befestigung der Anlenkstange an den Grundrahmen sowie die Verbindungsstelle des Hydraulikzylinders mit der Anlenkstange gebildete Seitenlinie des Kraftdreiecks bleibt ebenfalls während des gesamten Verstellbereiches der Hebebühne konstant. Die dritte Seite des Dreiecks, welche durch den Anlenkpunkt des Hydraulikzylinders am Grundrahmen und der Verbindungsstelle des Hydraulikzylinders mit der Anlenkstange gebildet wird, ändert während der Bewegung der Arbeitsbühne ihre Länge, je nach Stellung der Kolbenstange des Hydraulikzylinders. Befindet sich die Arbeitsbühne in der niedrigsten Stellung, so bildet das Kraftdreieck ein entartetes Dreieck, dessen Höhe sehr gering ist und damit sind die beiden Basiswinkel, welche durch die Grundlinie und die beiden als Schenkel fungierenden Seitenlinien gebildet werden, vernachläßigbar klein gegenüber dem aus dem beiden Schenkeln des Dreiecks gebildeten Winkel.In hydraulic lifts with parallel adjustment of the parking area, the parking area is shifted over two parallel link rods relative to the base of the lift frame so that the work platform remains parallel to the base of the frame at all times. With hydraulically adjustable lifts, the work surface is moved by means of a built-in hydraulic cylinder, which is located between the base frame and the linkage rods of the work surface. The force triangle resulting from the articulation points of the hydraulic cylinder on the base frame as well as the fastening point on the base frame and the connection point of the hydraulic cylinder with the articulation rod represents the force relationships in the adjusting device of the lifting platform at every point in time when the work platform is adjusted. The baseline of the power triangle is unchangeable and becomes formed by the two articulation points of the hydraulic cylinder and the articulation rod on the base frame. The side line of the power triangle formed by the attachment of the link rod to the base frame and the connection point of the hydraulic cylinder with the link rod also remains constant over the entire adjustment range of the lift. The third side of the triangle, which is formed by the articulation point of the hydraulic cylinder on the base frame and the connection point of the hydraulic cylinder with the articulation rod, changes its length during the movement of the working platform, depending on the position of the piston rod of the hydraulic cylinder. If the working platform is in the lowest position, the force triangle forms a degenerate triangle, the height of which is very low and the two base angles, which are formed by the base line and the two side lines that act as legs, are negligibly small compared to the one from the two Legs formed by the triangle.
Dies hat zur Folge, daß über den Hydraulikzylinder eine relativ große Kraft und auch ein großer Verstellweg der Kolbenstange aufgebracht werden muß, um die Arbeitsbühne merklich aus der Ruhelage zu bewegen.The consequence of this is that a relatively large force and also a large adjustment path of the piston rod must be applied via the hydraulic cylinder in order to move the working platform noticeably from the rest position.
In der anderen Extremstellung der Arbeitsbühne, in der sich die Arbeitsbühne in ihrer höchsten Stellung gegenüber dem Grundrahmen befindet, führt eine kleine Verstellung der Kolbenstange zu einer merklichen Änderung der Höhe der Arbeitsbühne. Sowohl die Verstellkraft der Arbeitsbühne, die zum Heben der Arbeitsbühne aufgebracht werden muß, als auch die Senkgeschwindigkeit der Arbeitsfläche sind von der Höhenlage der Arbeitsbühne und damit von den geometrischen Verhältnissen des Kraftdreiecks abhängig.In the other extreme position of the working platform, in which the working platform is in its highest position relative to the base frame, a small adjustment of the piston rod leads to a noticeable change in the height of the working platform. Both the adjustment force of the work platform, which must be applied to lift the work platform, and the lowering speed of the work surface depend on the height of the work platform and thus on the geometric relationships of the force triangle.
Beim Senken der Arbeitsfläche aus der höchsten Verstellage in die Grundstellung wird durch Öffnen des Senkventils des Hydraulikzylindes die Kolbenstange des Zylinders wieder eingefahren. Die Senkgeschwindigkeit hängt dabei ursächlich von der Öffnungsgröße des Senkventils ab. Bleibt die Öffnungstellung konstant über dem gesamten Verfahrweg der Arbeitsfläche zwischen höchster Endlage und Grundstellung, so ändert sich die Senkgeschwindigkeit der Arbeitsbühne aghängig von der Höhenlage der Arbeitsbühne und damit ursächlich von der Art und dem geometrischen Aufbau des Kraftdreiecks.When lowering the work surface from the highest adjustment position to the basic position, the piston rod of the cylinder is retracted by opening the lowering valve of the hydraulic cylinder. The lowering speed depends on the opening size of the lowering valve. If the opening position remains constant over the entire travel distance of the work surface between the highest end position and the basic position, the lowering speed of the work platform changes depending on the height of the work platform and thus causally on the type and the geometric structure of the force triangle.
In der höchsten Arbeitsstellung der Arbeitsbühne muß das Senkventil weit geöffnet werden, um ein zügiges Senken der Arbeitsbühne zu gewährleisten. Nähert sich jedoch die Arbeitsbühne ihrer unteren Grundstellung, so bewirkt ein kleiner Verfahrweg des Hydraulikkolbens eine große Höhenänderung der Arbeitsbühne. Dies führt dazu, daß die Arbeitsbühne bei geöffnetem Senkventil geradezu in die Ruhelage hineinfällt und sich zusätzlich wegen der sich ergebenden kleinen Winkel zwischen Grundrahmen, Arbeitsfläche und Anlenkstangen Klemmstellen ergeben, die zu Unfällen führen können.In the highest working position of the work platform, the lowering valve must be opened wide in order to quickly lower the Ensure working platform. However, if the work platform approaches its lower basic position, a small travel of the hydraulic piston causes a large change in the height of the work platform. This leads to the fact that when the lowering valve is open, the working platform almost falls into the rest position and, because of the small angles that result between the base frame, the work surface and the connecting rods, there are clamping points which can lead to accidents.
Der Erfindung liegt die Aufgabe zugrunde, eine Bremseinrichtung für eine hydraulische Hebebühne aufzuzeigen, die unabhängig vom Pedalverstellweg des Bedieners nur eine maximale Öffnungsstellung des Senkventils des Hydraulikzylinders zuläßt und außerdem noch die steigende Senkgeschwindigkeit der Arbeitsbühne bei Parallellenkerhebebühnen bei Erreichen der unteren Ruhestellung abbremst.The invention has for its object to show a braking device for a hydraulic lifting platform, which only allows a maximum open position of the lowering valve of the hydraulic cylinder regardless of the pedal adjustment path of the operator and also brakes the increasing lowering speed of the working platform with parallel linkage lifting platforms when the lower rest position is reached.
Diese Aufgabe wird dadurch gelöst, daß die Betätigungseinrichtung zum Öffnen des Senkbremsventils des Hydraulikzylinders von der Pedalstellung des Bedieners entkoppelt werden kann. Gleichzeitig ist das Senkventil in Ruhestellung des Senkpedals geschlossen. Durch die Entkopplung der Stellung des Senkventils vom Stellweg des Senkpedals beim Betätigen dieses Pedals ist es weiterhin möglich abhängig von der Höhenlage der Arbeitsbühne das Senkventil zu betätigen und damit die Senkgeschwindigkeit zu verändern. Erreicht die Arbeitsbühne die untere Grundstellung wird über diese Einrichtung das Senkventil geschlossen und damit die Senkgeschwindigkeit der Arbeitsbühne gedrosselt.This object is achieved in that the actuating device for opening the lowering brake valve of the hydraulic cylinder can be decoupled from the pedal position of the operator. At the same time, the lowering valve is closed in the rest position of the lowering pedal. By decoupling the position of the lowering valve from the travel of the lowering pedal when operating this pedal, it is still possible to operate the lowering valve depending on the height of the work platform and thus to change the lowering speed. If the work platform reaches the lower basic position, the lowering valve is closed via this device and thus the lowering speed of the work platform is throttled.
Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß die Senkgeschwindigkeit der Arbeitsbühne entlang des gesamten Verfahrweges der Arbeitsbühne von der höchsten Stellung bis in die untere Grundstellung über eine Kulissenschiene abhängig von der Höhenlage der Arbeitsbühne verändert und damit den jeweiligen Gefahrenpotentialen angepasst werden kann. Nachfolgend wird die Erfindung anhand der Darstellung eines Ausführungsbeispiels näher beschrieben. Die Ausführung wird durch folgende Bilder dargestellt:A preferred embodiment of the invention is that the lowering speed of the working platform along the entire travel path of the working platform from the highest position to the lower basic position can be changed via a link rail depending on the height of the working platform and can thus be adapted to the respective potential hazards. The invention is described in more detail below with the aid of an exemplary embodiment. The execution is shown by the following pictures:
Fig. 1 zeigt eine Seitenansicht einer hydraulischen Hebebühne, bei der sich die Arbeitsbühne in ihrer höchsten Stellung befindet;Fig. 1 shows a side view of a hydraulic lifting platform with the working platform in its highest position;
Fig. 2 zeigt schematisch die Betätigungseinrichtung zum Senken der Arbeitsbühne über ein Fußpedal;Fig. 2 shows schematically the actuating device for lowering the working platform via a foot pedal;
In Figur 1 wird der schematische Aufbau einer hydraulischen Hebebühne dargestellt. Der Grundrahmen 1 ist dabei so aufgebaut, daß er mit verschiedenen Mitteln am Fußboden befestigt werden kann. Am Grundrahmen 1 sind möglichst weit beabstandet die beiden Anlenkstangenpaare 3 und 3 montiert, welche die Arbeitsfläche 2 der Hebebühne tragen. Über diese Anlenkstangen 3 und 3 wird die Arbeitsbühne gesenkt und gehoben. Zwischen Grundrahmen 1 und Anlenkstangeπpaar 3'befindet sich der Hydraulikzylinder 4. Dieser Zylinder 4 ist über einen Bolzen 5 am Grundrahmen 1 befestigt. Die Kolbenstange 6 des Zylinders 4 ist über ein Anlenkstück 7 mittels des Bolzens 8 mit der Anlenkstange 3 verbunden. Die Anlenkstangen 3 und 3^sind über die Achsen 9 und 9 mit dem Grundrahmen 1 und über die Achsen 10 und lO'mit der Arbeitsfläche 2 gekoppelt.In Figure 1, the schematic structure of a hydraulic lift is shown. The base frame 1 is constructed so that it can be attached to the floor by various means. On the base frame 1, the two pairs of link rods 3 and 3 are mounted as far apart as possible, which support the working surface 2 of the lifting platform. The work platform is lowered and raised via these link rods 3 and 3. The hydraulic cylinder 4 is located between the base frame 1 and the coupling rod pair 3 ' . This cylinder 4 is fastened to the base frame 1 by means of a bolt 5. The piston rod 6 of the cylinder 4 is connected to the articulation rod 3 by means of a pin 8 by means of the pin 8. The link rods 3 and 3 ^ are coupled to the base frame 1 via the axes 9 and 9 and to the work surface 2 via the axes 10 and 10 ' .
Das Rastlenkerpaar 11 ist über die Achse 12 mit der Anlenkstange 3^ verbunden. Die Querstange 13 des Rastlenkerpaares 1 1 greift über Zapfen 15 (siehe Figur 2) zu beiden Enden der Querstange 13 in eine Kulissenschiene 14 ein, die am Grundrahmenl befestigt ist. Die Kulissenschiene 14 besitzt ein sägezahnartiges Aussehen, wobei die Zähne stark verrundet sind und in die Richtung der Anlenkstange 3'zeigen, um ein unbeabsichtigtes Senken der Arbeitsbühne 2 zu vermeiden. Obwohl beim Heben der Arbeitsfläche 2 über den Hydraulikzylinder 4 das Senkventil geschlossen ist, kann durch eine Undichtigkeit des Zylinders oder durch ein unabsichtliches Betätigen des Senkventils sich die Arbeitsbühne senken. Dies wird durch das Rastlenkerpaar 1 1 verhindert, da beim unabsichtlichen Senken der Arbeitsfläche 2 die Zapfen 15 in den Ausnehmungen 16 der Kulissenschiene 14 einrastet.The locking link pair 11 is connected via the axis 12 to the link rod 3 ^ . The crossbar 13 of the locking link pair 11 engages via pins 15 (see FIG. 2) at both ends of the crossbar 13 in a link rail 14 which is fastened to the base frame. The link rail 14 has a sawtooth-like appearance, the teeth being strongly rounded and pointing in the direction of the linkage rod 3 ′ in order to prevent the work platform 2 from being lowered unintentionally. Although the lowering valve is closed when lifting the work surface 2 via the hydraulic cylinder 4, can a leak in the cylinder or an inadvertent actuation of the lowering valve lowers the work platform. This is prevented by the pair of latching links 1 1, since when the working surface 2 is inadvertently lowered, the pins 15 snap into the recesses 16 in the link rail 14.
In Figur 2 ist die Versteileinrichtung für das Senkpedal 19 dargestellt. Das per Fußdruck zu betätigende Pedal ist auf der Verstellwelle 17 für das Senkventil 21 des Hydraulikzylinders 4 gelagert. Die Verstellwelle 17 ist über eine Spiralfeder 18 mit dem Senkpedal 19 verbunden. Wird das Senkpedal 19 betätigt, so wird über die Feder 18 die Verstellwelle 17 gedreht und das Senkventil 21 geöffnet. Gleichzeitig wird mittels des auf der Versteilwelle 17 angebrachten Verstellbleches 22 das Rastlenkerpaar 11 aus der Raststellung der Kulissenschiene 14 angehoben, so daß sich die Zapfen 15 des Rastelenkerpaares 1 1 oberhalb der Ausnehmungen der Kulissenschiene 14 befinden. Damit senkt sich die Arbeitsbühne 2 bereits durch ihr Eigengewicht in die untere Ruhestellung. Über eine Rückholfeder 25, die sich zwischen Grundrahmen 1 und Verstellwelle 17 befindet, wird das Senkventil 21 des Hydraulikzylinders 4 beim Loslassen des Senkpedals 19 automatisch geschlossen und somit ein weiteres Absenken der Arbeitsbühne 2 verhindert. Auch beim Versagen des Senkventils 21 infolge Undichtigkeiten bleibt die Arbeitsbühne auf der gewünschten Höhe stehen, da durch die Rückholfeder 25 die Verstellwelle 17 verdreht wird, so daß die beiden Feststellzapfen 15 in eine der Ausnehmungen der Kulissenschiene 14 einrasten und damit ein weiteres Absenken der Arbeitsbühne 2 verhindern.The adjusting device for the lowering pedal 19 is shown in FIG. The pedal to be actuated by foot pressure is mounted on the adjusting shaft 17 for the lowering valve 21 of the hydraulic cylinder 4. The adjusting shaft 17 is connected to the lowering pedal 19 via a spiral spring 18. If the lowering pedal 19 is actuated, the adjusting shaft 17 is rotated via the spring 18 and the lowering valve 21 is opened. At the same time, the locking link pair 11 is lifted out of the locking position of the link rail 14 by means of the adjusting plate 22 attached to the adjusting shaft 17, so that the pins 15 of the locking link pair 11 are above the recesses of the link rail 14. As a result, the work platform 2 already sinks into its lower rest position due to its own weight. Via a return spring 25, which is located between the base frame 1 and the adjusting shaft 17, the lowering valve 21 of the hydraulic cylinder 4 is automatically closed when the lowering pedal 19 is released, thus preventing a further lowering of the working platform 2. Even if the lowering valve 21 fails as a result of leaks, the working platform remains at the desired height, since the return shaft 25 rotates the adjusting shaft 17, so that the two locking pins 15 snap into one of the recesses in the link rail 14 and thus further lower the working platform 2 prevent.
Um ein zu schnelles ruckartiges Senken der Arbeitsbühne 2 zu verhindern, befindet sich oberhalb der Kulissenschiene 14 ein Anschlagblech 23, welches ein weiteres Heben der Feststellzapfen 15 des Rastlenkerpaares 11 verhindert. Durch die Kulissenschiene 14 und das Anschlagblech 23 ist der vertikale Weg der Feststellzapfen begrenzt. Je weiter das Senkventil 21 des Hydraulikzylinders 4 geöffnet ist, desto höher wird der Feststellzapfen 15 mittels Verstellblech 22 über die Kulissenschiene 14 angehoben. Durch den Abstand des Anschlagbleches 23 von der Kulissenschiene 14 wird der maximale Verstellweg der Verstellwelle 17 begrenzt und damit auch die maximale Öffnung des Senkventils 21 beschränkt.In order to prevent the working platform 2 from being jerkily lowered too quickly, there is a stop plate 23 above the guide rail 14, which prevents further lifting of the locking pins 15 of the locking link pair 11. The vertical path of the locking pin is limited by the link rail 14 and the stop plate 23. The further the lowering valve 21 of the hydraulic cylinder 4 is opened, the higher the locking pin 15 is raised by means of the adjusting plate 22 over the link rail 14. The distance of the stop plate 23 from the link rail 14 limits the maximum adjustment path of the adjustment shaft 17 and thus also limits the maximum opening of the lowering valve 21.
Durch eine kurvenartige Ausbildung des Anschlagbleches 23 kann über den Verfahrweg der Feststellzapfen 15 und damit der Höhenstellung der Arbeitsbühne 2 die Senkgeschwindigkeit der Arbeitsbühne 2 eingestellt werden.Due to a curved design of the stop plate 23, the lowering speed of the work platform 2 can be set via the travel of the locking pin 15 and thus the height position of the work platform 2.
Befindet sich die Arbeitsbühne 2 in der höchsten Stellung und damit die Zapfen 15 in der rechten Endlage 24, nahe beim Hydraulikzylinder 4, so wird durch einen relativ großen Abstand zwischen Kulissenschiene 14 und Anschlagblech 23 die maximal mögliche Öffnung des Senkventils 21 ermöglicht.If the working platform 2 is in the highest position and thus the pin 15 in the right end position 24, close to the hydraulic cylinder 4, the maximum possible opening of the lowering valve 21 is made possible by a relatively large distance between the link rail 14 and the stop plate 23.
Nähert sich die Arbeitsbühne 2 ihrer unteren Ruhelage, so wird durch einen möglichst geringen Abstand zwischen Kulissenschiene 14 und Anschlagblech 23 das Senkventil geschlossen und damit die Senkgeschwindigkeit der Arbeitsbühne 2 verlangsamt, um ein unbeabsichtigtes Einklemmen zu vermeiden. Es kann damit durch die Form des Anschlagbleches 23 und den sich damit ergebenden Abstand des Anschlagbleches 23 von der Kulissenschiene 14 die Senkgeschwindigkeit der Arbeitsbühne 2 abhängig von der Höhenlage der Arbeitsbühne beschränkt werden. If the working platform 2 approaches its lower rest position, the lowering valve is closed by the smallest possible distance between the link rail 14 and the stop plate 23, and thus the lowering speed of the working platform 2 is slowed down in order to avoid unintentional jamming. It can be limited by the shape of the stop plate 23 and the resulting distance of the stop plate 23 from the link rail 14, the lowering speed of the work platform 2 depending on the height of the work platform.

Claims

Patentansprüche claims
1. Senkbremseinrichtung für eine hydraulische Hebebühne, deren Arbeitsbühne mit Parallellenkern am Grundrahmen befestigt ist.dadurch gekennzeichnet, daß beim Absenken der Arbeitsbühne (2) über den Hydraulikzylinder (4) der Öffnungszustand des Senkventils (21) über eine Verstellwelle (17) gesteuert wird und die Stellung des Betätigungspedals (19) des Senkventils (21 ) mittels Feder (18) von der Verstellwelle (17) entkoppelt ist.Lowering brake device for a hydraulic lifting platform, the working platform of which is attached to the base frame by means of a parallel shaft the position of the actuating pedal (19) of the lowering valve (21) is decoupled from the adjusting shaft (17) by means of a spring (18).
2. Senkbremseinrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die Verdrehstellung der Verstellwelle (17) über ein Verstellblech (14) gesteuert wird, welches abhängig von der Höhenlage der Arbeitsbühne (2) die Verstellwelle verdreht.2. Lowering brake device according to claim 1, characterized in that the rotational position of the adjusting shaft (17) is controlled via an adjusting plate (14) which rotates the adjusting shaft depending on the height of the working platform (2).
3. Senkbremseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß abhängig von der Höhenlage der Arbeitsbühne (2) das Rastlenkerpaar (1 1 ) längs des Verstellbleches (14) bewegt wird und über das Rastlenkerpaar (1 1 ) das Verstellblech (14) gedreht wird.3. Lowering brake device according to claim 1 or 2, characterized in that depending on the height of the working platform (2) the locking link pair (1 1) is moved along the adjusting plate (14) and the locking plate (1 1), the adjusting plate (14) rotated becomes.
4. Senkbremseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Zapfen (15) des Rastlenkerpaares (11 ) über ein oberhalb der Zapfen (15) sich befindliches Anschlagblech (23) geführt werden und durch dieses Anschlagblech (23) der maximale Verstellweg des Verstellbleches festgelegt wird.4. Lowering brake device according to claim 1 or 2, characterized in that the pin (15) of the locking link pair (11) via an above the pin (15) located stop plate (23) and through this stop plate (23) the maximum adjustment of the Adjustment plate is fixed.
5. Senkbremseinrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das Anschlagblech (23) längs des Verstellbleches (14) eine unterschiedliche Höhenlage einnimmt und damit die Stellung des Senkbremsventils (21 ) abhängig von der Höhenlage der Arbeitsbühne (2) gesteuert werden kann. 5. Lowering brake device according to one of the preceding claims, characterized in that the stop plate (23) along the adjusting plate (14) assumes a different height and thus the position of the lowering brake valve (21) can be controlled depending on the height of the work platform (2).
6. Senkbremseinrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Senkgeschwindigkeit der Arbeitsbühne (21 ) beim Einlaufen in die untere Ruhestellung der Arbeitsbühne (2) durch den geringeren Höhenabstand des Anschlagbleches (23) von der Kulissenschiene (14) gedrosselt wird.6. Lowering brake device according to one of the preceding claims, characterized in that the lowering speed of the working platform (21) is throttled when entering the lower rest position of the working platform (2) by the smaller height distance of the stop plate (23) from the link rail (14).
7. Senkbremseinrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß durch eine kurvenförmige Ausbildung des Anschlagbleches (23) die Senkgeschwindigkeit der Arbeitsbühne (2) abhängig von der Höhenlage der Arbeitsbühne gesteuert wird. 7. Lowering brake device according to one of the preceding claims, characterized in that the lowering speed of the working platform (2) is controlled depending on the height of the working platform by a curved design of the stop plate (23).
PCT/DE1999/002166 1998-07-14 1999-07-13 Lowering brake device for hydraulic elevating platforms WO2000003942A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19831546.5 1998-07-14
DE1998131546 DE19831546C1 (en) 1998-07-14 1998-07-14 Lowering brake device for hydraulic lifts

Publications (2)

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WO2000003942A2 true WO2000003942A2 (en) 2000-01-27
WO2000003942A3 WO2000003942A3 (en) 2000-09-21

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WO (1) WO2000003942A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026037A1 (en) * 2000-05-25 2001-12-06 Hein Gericke Gmbh Lifting device especially for motorcycles under repair has rotatably mounted locking pawl and toothed rack rotating with lifting frame, and lock is mechanically released by operating element on drive

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008039224A1 (en) * 2008-08-20 2010-03-04 Mhg Gmbh flat Lifter

Citations (3)

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Publication number Priority date Publication date Assignee Title
GB2055754A (en) * 1979-08-08 1981-03-11 Inst Produktudvikling An actuator mechanism for lifting and lowering the supporting surface of piece of furniture, such as a bed or chair, having a locking mechanism for maintaining the supporting surface in a vertical position obtained by means of the actuator mechanism
DE29719926U1 (en) * 1997-11-10 1998-02-26 Lehnert, Rudolf, 86529 Schrobenhausen Mechanical height adjustment of hand-operated motorcycle lifts
DE29817350U1 (en) * 1998-07-14 1999-04-08 Lehnert, Rudolf, 86529 Schrobenhausen Lowering brake device for hydraulic lifts

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Publication number Priority date Publication date Assignee Title
DE6916660U (en) * 1969-04-25 1969-10-09 Ver Flugtechnische Werke DEVICE FOR DAMPING THE IN AND OUT MOVEMENT OF HYDRAULICALLY OPERATED LIFTING TABLES

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2055754A (en) * 1979-08-08 1981-03-11 Inst Produktudvikling An actuator mechanism for lifting and lowering the supporting surface of piece of furniture, such as a bed or chair, having a locking mechanism for maintaining the supporting surface in a vertical position obtained by means of the actuator mechanism
DE29719926U1 (en) * 1997-11-10 1998-02-26 Lehnert, Rudolf, 86529 Schrobenhausen Mechanical height adjustment of hand-operated motorcycle lifts
DE29817350U1 (en) * 1998-07-14 1999-04-08 Lehnert, Rudolf, 86529 Schrobenhausen Lowering brake device for hydraulic lifts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026037A1 (en) * 2000-05-25 2001-12-06 Hein Gericke Gmbh Lifting device especially for motorcycles under repair has rotatably mounted locking pawl and toothed rack rotating with lifting frame, and lock is mechanically released by operating element on drive

Also Published As

Publication number Publication date
WO2000003942A3 (en) 2000-09-21
DE19831546C1 (en) 2000-05-11

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