EP2706032A1 - Load bearing device, in particular lower pulley block for a lifting device - Google Patents

Load bearing device, in particular lower pulley block for a lifting device Download PDF

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Publication number
EP2706032A1
EP2706032A1 EP13183659.5A EP13183659A EP2706032A1 EP 2706032 A1 EP2706032 A1 EP 2706032A1 EP 13183659 A EP13183659 A EP 13183659A EP 2706032 A1 EP2706032 A1 EP 2706032A1
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EP
European Patent Office
Prior art keywords
load
suspension unit
coupling
coupling parts
relative
Prior art date
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Granted
Application number
EP13183659.5A
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German (de)
French (fr)
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EP2706032B1 (en
Inventor
Heinz Jendrny
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Koro Riw GmbH
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RIW-Maschinenbau GmbH
RIW MASCHB GmbH
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Publication of EP2706032A1 publication Critical patent/EP2706032A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
    • B66C1/34—Crane hooks

Definitions

  • the present invention relates to a load-carrying device, in particular a lower block for a hoist, according to the subject-matter of independent claim 1 and a pulley, in particular for use on a crane, with at least one such load-receiving device.
  • Load-receiving devices with load hook and suspension unit are known from the prior art, in particular lower bottles for hoists, and in particular for use with at least one cable pull.
  • the load hook is pivotable about a horizontal axis and about a vertical axis by means of specially provided bearings.
  • a possible rotational movement about the vertical axis is desirable for preventing high shear forces in a lifting harness attached to the load hook when lifting a load.
  • a rigid connection between load hook and suspension unit is advantageous if a load attached to the lifting harness is to be positioned so that unwanted rotational movements of the load, which would be made possible by a rotational movement of the load hook about the vertical axis, can be prevented.
  • the present invention is a load-receiving device, in particular a lower block for a hoist, and in particular for use with at least one cable comprising a load hook, a traverse and a suspension unit for suspending the load receiving device to at least one cable, wherein the suspension unit first bearing with in Has substantially horizontally arranged bearing axis for receiving the traverse. Furthermore, the suspension unit has a second bearing with a substantially vertically arranged axis of rotation about which the load hook is rotatably mounted in an operational state.
  • the load receiving device comprises a brake coupling with at least two coupling parts, each having at least one contact surface, wherein the contact surfaces come into mutual contact in at least one operating state and the two coupling parts on the contact surfaces are friction overcome relative to each other, wherein the first of the two coupling parts with the load hook and the second of the two coupling parts is connected to the suspension unit, for the controlled coupling of a rotary movement of the load hook relative to the suspension unit about the vertical axis of rotation.
  • a suitable design of the brake coupling can be achieved that in a positioning of a load, a mechanical coupling between load hook and suspension unit advantageous as a rigid connection is effective, and when lifting a load a compensating rotational movement to prevent the occurrence of high shear forces in a lifting harness is possible.
  • the brake coupling has at least one adjusting device for adjusting a contact force between the coupling parts which are movable relative to each other by friction, by means of which an effective braking frictional force can be set between the coupling parts.
  • an effective mechanical coupling between the load hook and the suspension unit can be set up flexibly to a desired load movement action. If the adjusting device can be brought at least between a release position in which the rotational movement of the load hook is released relative to the suspension unit, and a holding position in which the rotational movement of the load hook is braked relative to the suspension unit by a predetermined braking frictional force, the described advantage can be particularly simple Be achieved.
  • the adjusting device comprises an electric actuator for adjusting the contact pressure between the friction parts that are movable relative to one another in terms of friction.
  • the effective braking frictional force between the coupling parts can be designed to be adjustable at any desired time of the load movement and by remote control.
  • the electric actuator may be formed by an electric motor, which is intended to adjust a threaded spindle arranged on a central axis, which is mounted at one end to one of the coupling parts in a thrust bearing and on which a threaded member is positively arranged, that rigid with connect to the other coupling part.
  • the movement of the adjusting device between the holding position and the release position by means of the electric actuator can be actuated.
  • the coupling parts that move relative to one another with friction overcoming have a plurality of contact surfaces which are intended to come into mutual mutual contact in the at least one operating state. This can be achieved by an increased overall contact surface with the same surface pressure, i. same material load, a greater normal force between the coupling parts are effective, which in conjunction with the friction between the coupling parts, a greater effective braking friction can be achieved, which is particularly advantageous for heavy loads.
  • the brake coupling is at least partially arranged in a protective space formed by the suspension unit.
  • a mechanical protection for the brake clutch can be provided, which is covered by the suspension unit at least partially to the outside.
  • a further object of the invention is to provide a pulley, in particular for use on a crane, comprising at least one load handling device according to one of the described further developed embodiments or a combination thereof.
  • FIG. 1 is a load-receiving device, which is formed by a lower block 10 for a lifting crane designed as a crane (not shown), shown schematically.
  • the load handling device is designed to accommodate loads up to 80 t.
  • the load bearing device according to the invention can also be designed for higher loads than 80 t.
  • the load-carrying device has a suspension unit 12 for suspension on a cable pull.
  • the suspension unit 12 comprises two parallel spaced base plates 14, 14 'made of iron and a traverse 18 (FIG. Fig. 2 ). At each of the base plates 14, 14 'is one of the other base plate 14', 14 facing away from Disk boxes 24, 24 'attached, which forms a cavity for receiving pulleys 26.
  • the pulleys 26 have on their outer circumference in each case a circumferential groove 28 for receiving a hoisting rope, so that in the ready state two hoisting ropes from above in a known manner several times in the respective disc box 24, 24 'on and after circulation around one of the pulleys 26th go up from the disc box 24, 24 'and thus form the cable, by means of which the lower block 10 (not shown) forms a pulley with a top bottle and is connected to perform a lifting or lowering movement by an adjustment of the hoisting rope.
  • the load receiving device further comprises a hook designed as a double hook 30, on which an upwardly directed, substantially cylindrical load hook shaft 32 is integrally formed between the hook tips.
  • the load hook shaft 32 is guided in a known manner through a through hole 22 of the traverse 18 of the suspension unit 12.
  • the traverse 18 has laterally horizontally oriented bearing pins 20, 20 '.
  • the suspension unit 12 comprises, in a lower region of the base plates 14, 14 'remote from the disc cases 24, 24', first bearings 40, 40 'with aligned bearing axes 42, 42' arranged substantially horizontally.
  • the bearing pins 20, 20 'of the traverse 18 in the first bearings 40, 40' of the suspension unit 12 are stored.
  • the load hook 30 remote from the end of the load hook shaft 32 is provided in the ready state in a known manner with a hook nut.
  • the suspension unit 12 in a known manner with a designed as a rolling bearing second bearing (not shown) equipped with a substantially vertically disposed pivot axis 44, by which the load hook 30 by means of a thrust bearing on a bottom (not shown) of Hook nut is rotatably mounted in the ready state.
  • a rolling bearing second bearing (not shown) equipped with a substantially vertically disposed pivot axis 44, by which the load hook 30 by means of a thrust bearing on a bottom (not shown) of Hook nut is rotatably mounted in the ready state.
  • the load receiving device has a brake coupling 46 with two coupling parts 48, 50 ( Fig. 3 ).
  • the first coupling part 48 of the two coupling parts 48, 50 is in the ready state rigidly connected to the hook nut and thus rigidly connected to the load hook 30 and comprises at a load hook shaft 32 remote from the end of a first plurality of annular contact surfaces 52.
  • the first contact surfaces 52 have increased by a suitable surface treatment sliding and static friction coefficient.
  • the second coupling part 50 of the two coupling parts 48, 50 comprises a plurality of second annular surfaces formed in contact surfaces 54, which also have an increased by a suitable surface treatment sliding and static friction coefficient.
  • the first contact surfaces 52 and the second contact surfaces 54 are provided for the controlled coupling of a rotational movement of the load hook 30 relative to the suspension unit 12 about the vertical axis of rotation 44 to come at least in an operating state for mutual contact.
  • the two coupling parts 48, 50 are on the first and second bearing surfaces 52, 54 relative to each other friction over movable.
  • a mobility of the two coupling parts 48, 50 depends on a between the first contact surfaces 52 and the second contact surfaces 54 perpendicularly acting normal force in the form of a contact pressure and a coefficient of friction by the sliding and static friction coefficients of the first contact surfaces 52 and the second contact surfaces 54th is determined.
  • the brake coupling 46 has an adjusting device 56.
  • an effective brake friction between the coupling parts 48, 50 is adjustable, as will be explained below.
  • the adjusting device 56 comprises an electric actuator 58 for adjusting the relative position of the coupling parts 48, 50.
  • the electric actuator 58 is formed by an electric motor which is releasably fixedly secured between the base plates 14, 14 'and intended to be central when activated to set in rotation about the vertical axis of rotation 44 arranged on an underside of the electric motor and provided with an internal thread threaded element 60.
  • a cylindrical pin 62 formed on the upper side which is provided with an external thread, which is in the operable state in positive engagement with the corresponding internal thread of the threaded member 60, so that upon activation of the equipped with two directions of rotation electric motor, a change in a relative position of the first Contact surfaces 52 and the second contact surfaces 54 and thus the two coupling parts 48, 50 allows each other in both directions.
  • a spring load not shown, between an upper side of the second coupling part 50 and the underside of the actuator 58, an undesired rotation of the second coupling part 50 about the vertical axis of rotation 44 upon actuation of the actuator 58 is prevented.
  • the second coupling part 50 is connected in the ready state by means of the electric motor with the base plates 14, 14 'and thus with the suspension unit 12.
  • a first operating condition in which the first abutment surfaces 52 and the second abutment surfaces 54 are not in abutment with one another, but rather are spaced apart, as in FIG Fig. 3 illustrated, the coupling of the rotational movement of the load hook 30 is released relative to the suspension unit 12.
  • this first operating state which corresponds to a release position of the adjusting device 56, the load hook 30 is freely rotatable relative to the suspension unit 12 about the vertical axis of rotation 44.
  • the release position can be advantageously used when lifting a load to prevent the occurrence of high shear forces by compensating rotational movement of the load hook 30 about the vertical axis of rotation 44.
  • second operating state in which the first contact surfaces 52 and the second contact surfaces 54 are in mutual contact and between the first contact surfaces 52 and the second contact surfaces 54 a predetermined maximum contact force acts, the rotational movement of the load hook 30 relative to the suspension unit 12th slowed down by a given brake friction force.
  • This second operating state corresponds to a holding position of the adjusting device 56, in which the rotational movement of the load hook 30 is braked about the vertical axis of rotation 44 with a predetermined maximum braking frictional force.
  • the holding position can be advantageously used when positioning a load, if a mechanical coupling between load hook 30 and suspension unit 12 is desired, which is effective as a rigid connection.
  • the adjusting device 56 can be reversibly moved between the release position and the holding position. Furthermore, by operation of the actuator 58 and thus of the adjusting device 56, any intermediate values for the brake friction force between a brake friction force close to zero in the release position of the adjusting device 56 and the maximum braking friction force in the holding position of the adjusting device 56 can be adjusted.
  • the brake coupling 46 is arranged largely with its main parts in a protective space 16 formed by the spaced base plates 14, 14 'of the suspension unit 12, a mechanical protection for the brake coupling 46 can be provided.

Abstract

The device i.e. hook block (10), has hanging unit (12) for hanging the device at a Bowden cable and comprising a bearing with a horizontal bearing axis. The unit has another bearing with a vertical rotational axis (44). A brake clutch has coupling parts with respective contact surfaces. The parts are movable relative to each other in a friction-bearing manner. The parts are connected with a load hook (30) and the hanging unit, respectively for controlled coupling of rotating movement of the hook around the vertical rotational axis relative to the hanging unit.

Description

Die vorliegende Erfindung betrifft eine Lastaufnahmevorrichtung, insbesondere eine Unterflasche für ein Hebezeug, gemäß dem Gegenstand des unabhängigen Anspruchs 1 sowie einen Flaschenzug, insbesondere zur Verwendung an einem Kran, mit zumindest einer derartigen Lastaufnahmevorrichtung.The present invention relates to a load-carrying device, in particular a lower block for a hoist, according to the subject-matter of independent claim 1 and a pulley, in particular for use on a crane, with at least one such load-receiving device.

Stand der TechnikState of the art

Aus dem Stand der Technik sind Lastaufnahmevorrichtungen mit Lasthaken und Aufhängeeinheit bekannt, insbesondere Unterflaschen für Hebezeuge, und insbesondere zur Verwendung mit zumindest einem Seilzug. Dabei ist der Lasthaken mittels speziell dafür vorgesehener Lager um eine horizontale Achse und um eine vertikale Achse schwenk- bzw. drehbar.Load-receiving devices with load hook and suspension unit are known from the prior art, in particular lower bottles for hoists, and in particular for use with at least one cable pull. In this case, the load hook is pivotable about a horizontal axis and about a vertical axis by means of specially provided bearings.

Eine mögliche Drehbewegung um die vertikale Achse ist zur Verhinderung hoher Scherkräfte in einem am Lasthaken angehängten Hebegeschirr beim Anheben einer Last wünschenswert. Andererseits ist eine starre Verbindung zwischen Lasthaken und Aufhängeeinheit vorteilhaft, wenn eine am Hebegeschirr angehängte Last positioniert werden soll, damit ungewollte Rotationsbewegungen der Last, die durch eine Drehbewegung des Lasthakens um die vertikale Achse ermöglicht wären, verhindert werden können.A possible rotational movement about the vertical axis is desirable for preventing high shear forces in a lifting harness attached to the load hook when lifting a load. On the other hand, a rigid connection between load hook and suspension unit is advantageous if a load attached to the lifting harness is to be positioned so that unwanted rotational movements of the load, which would be made possible by a rotational movement of the load hook about the vertical axis, can be prevented.

Es ist daher eine Aufgabe der Erfindung, die oben genannten Anforderungen zu erfüllen und eine Lastaufnahmevorrichtung bereitzustellen, durch die ein Auftreten hohe Scherkräfte beim Anheben der Last verhindert und ein positionsgenaues Ablegen der Last ermöglicht ist.It is therefore an object of the invention to meet the above-mentioned requirements and to provide a load-receiving device, by which an occurrence of high shear forces when lifting the load is prevented and a positionally accurate depositing of the load is possible.

Offenbarung der ErfindungDisclosure of the invention

Gegenstand der vorliegenden Erfindung ist eine Lastaufnahmevorrichtung, insbesondere eine Unterflasche für ein Hebezeug, und insbesondere zur Verwendung mit zumindest einem Seilzug, die einen Lasthaken, eine Traverse und eine Aufhängeeinheit zur Aufhängung der Lastaufnahmevorrichtung an zumindest einen Seilzug umfasst, wobei die Aufhängeeinheit erste Lager mit im Wesentlichen horizontal angeordneter Lagerachse zur Aufnahme der Traverse aufweist. Ferner weist die Aufhängeeinheit ein zweites Lager mit einer im Wesentlichen vertikal angeordneten Drehachse auf, um die der Lasthaken in einem betriebsbereiten Zustand drehbar gelagert ist.The present invention is a load-receiving device, in particular a lower block for a hoist, and in particular for use with at least one cable comprising a load hook, a traverse and a suspension unit for suspending the load receiving device to at least one cable, wherein the suspension unit first bearing with in Has substantially horizontally arranged bearing axis for receiving the traverse. Furthermore, the suspension unit has a second bearing with a substantially vertically arranged axis of rotation about which the load hook is rotatably mounted in an operational state.

Es wird vorgeschlagen, dass die Lastaufnahmevorrichtung eine Bremskupplung mit zumindest zwei Kupplungsteilen umfasst, die jeweils mindestens eine Anlagefläche aufweisen, wobei die Anlageflächen in zumindest einem Betriebszustand zur gegenseitigen Anlage kommen und die zwei Kupplungsteile an den Anlageflächen relativ zueinander reibungsüberwindend bewegbar sind, wobei das erste der beiden Kupplungsteile mit dem Lasthaken und das zweite der beiden Kupplungsteile mit der Aufhängeeinheit verbunden ist, zur kontrollierten Kopplung einer Drehbewegung des Lasthakens relativ zur Aufhängeeinheit um die vertikale Drehachse.It is proposed that the load receiving device comprises a brake coupling with at least two coupling parts, each having at least one contact surface, wherein the contact surfaces come into mutual contact in at least one operating state and the two coupling parts on the contact surfaces are friction overcome relative to each other, wherein the first of the two coupling parts with the load hook and the second of the two coupling parts is connected to the suspension unit, for the controlled coupling of a rotary movement of the load hook relative to the suspension unit about the vertical axis of rotation.

Bei einer geeigneten Auslegung der Bremskupplung kann dadurch erreicht werden, dass bei einem Positionieren einer Last eine mechanische Kopplung zwischen Lasthaken und Aufhängeeinheit vorteilhaft als eine starre Verbindung wirksam ist, und bei einem Anheben einer Last eine ausgleichende Drehbewegung zur Verhinderung eines Auftretens hoher Scherkräfte in einem Hebegeschirr ermöglicht ist.With a suitable design of the brake coupling can be achieved that in a positioning of a load, a mechanical coupling between load hook and suspension unit advantageous as a rigid connection is effective, and when lifting a load a compensating rotational movement to prevent the occurrence of high shear forces in a lifting harness is possible.

Ferner wird vorgeschlagen, dass die Bremskupplung zumindest eine Verstellvorrichtung zur Verstellung einer Anpresskraft zwischen den relativ zueinander reibungsüberwindend beweglichen Kupplungsteilen aufweist, mittels der eine wirksame Bremsreibkraft zwischen den Kupplungsteilen einstellbar ist. Dadurch kann eine wirksame mechanische Kopplung zwischen Lasthaken und Aufhängeeinheit flexibel auf eine gewünschte Lastbewegungshandlung eingerichtet werden. Wenn die Verstellvorrichtung zumindest zwischen einer Freigabestellung, in der die Drehbewegung des Lasthakens relativ zur Aufhängeeinheit freigegeben ist, und einer Haltestellung, bei der die Drehbewegung des Lasthakens relativ zur Aufhängeeinheit durch eine vorgegebene Bremsreibkraft gebremst ist, verbringbar ist, kann der beschriebene Vorteil auf besonders einfache Weise erreicht werden.It is also proposed that the brake coupling has at least one adjusting device for adjusting a contact force between the coupling parts which are movable relative to each other by friction, by means of which an effective braking frictional force can be set between the coupling parts. As a result, an effective mechanical coupling between the load hook and the suspension unit can be set up flexibly to a desired load movement action. If the adjusting device can be brought at least between a release position in which the rotational movement of the load hook is released relative to the suspension unit, and a holding position in which the rotational movement of the load hook is braked relative to the suspension unit by a predetermined braking frictional force, the described advantage can be particularly simple Be achieved.

Besonders vorteilhaft umfasst die Verstellvorrichtung einen elektrischen Aktor zur Verstellung der Anpresskraft zwischen den relativ zueinander reibungsüberwindend beweglichen Kupplungsteilen. Dadurch kann die wirksame Bremsreibkraft zwischen den Kupplungsteilen zu jedem gewünschten Zeitpunkt der Lastbewegung und mittels Fernbedienung einstellbar ausgelegt werden. Beispielweise kann der elektrische Aktor von einem Elektromotor gebildet sein, der dazu vorgesehen ist, eine auf einer Mittelachse angeordnete Gewindespindel zu verstellen, die an einem Ende an einem der Kupplungsteile in einem Axiallager gelagert ist und auf der ein Gewindeelement formschlüssig angeordnet ist, dass starr mit dem anderen Kupplungsteil verbinden ist.Particularly advantageously, the adjusting device comprises an electric actuator for adjusting the contact pressure between the friction parts that are movable relative to one another in terms of friction. As a result, the effective braking frictional force between the coupling parts can be designed to be adjustable at any desired time of the load movement and by remote control. For example, the electric actuator may be formed by an electric motor, which is intended to adjust a threaded spindle arranged on a central axis, which is mounted at one end to one of the coupling parts in a thrust bearing and on which a threaded member is positively arranged, that rigid with connect to the other coupling part.

In einer besonders einfach realisierbaren, vorteilhaften Lösung ist die Verbringung der Verstellvorrichtung zwischen der Haltestellung und der Freigabestellung mittels des elektrischen Aktors betätigbar.In a particularly easy to implement, advantageous solution, the movement of the adjusting device between the holding position and the release position by means of the electric actuator can be actuated.

Zudem wird vorgeschlagen, dass die die relativ zueinander reibungsüberwindend beweglichen Kupplungsteile eine Mehrzahl von Anlageflächen aufweisen, die dazu vorgesehen sind, in dem zumindest einen Betriebszustand zur gegenseitigen Anlage zu gelangen. Dadurch kann durch eine vergrößerte Gesamtanlagefläche bei gleicher Flächenpressung, d.h. gleicher Materialbelastung, eine größere Normalkraft zwischen den Kupplungsteilen wirksam werden, wodurch in Verbindung mit der Reibung zwischen den Kupplungsteilen eine größere wirksame Bremsreibkraft erzielbar sein kann, was insbesondere bei schweren Lasten von Vorteil ist.In addition, it is proposed that the coupling parts that move relative to one another with friction overcoming have a plurality of contact surfaces which are intended to come into mutual mutual contact in the at least one operating state. This can be achieved by an increased overall contact surface with the same surface pressure, i. same material load, a greater normal force between the coupling parts are effective, which in conjunction with the friction between the coupling parts, a greater effective braking friction can be achieved, which is particularly advantageous for heavy loads.

Mit besonderem Vorteil ist die Bremskupplung zumindest teilweise in einem von der Aufhängeeinheit gebildeten Schutzraum angeordnet. Dadurch kann ein mechanischer Schutz für die Bremskupplung bereitgestellt werden, die von der Aufhängeeinheit zumindest teilweise nach außen abgedeckt ist.With particular advantage, the brake coupling is at least partially arranged in a protective space formed by the suspension unit. Thereby, a mechanical protection for the brake clutch can be provided, which is covered by the suspension unit at least partially to the outside.

Ein weiteres Ziel der Erfindung ist die Bereitstellung eines Flaschenzugs, insbesondere zur Verwendung an einem Kran, der zumindest eine Lastaufnahmevorrichtung gemäß einer der beschriebenen weitergebildeten Ausführungsformen oder einer Kombination derselben umfasst.A further object of the invention is to provide a pulley, in particular for use on a crane, comprising at least one load handling device according to one of the described further developed embodiments or a combination thereof.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigt

Fig. 1:
ein Ausführungsbeispiel einer erfindungsgemäßen Lastaufnahmevorrichtung in einer seitlichen Ansicht,
Fig. 2
die erfindungsgemäße Lastaufnahmevorrichtung gemäß Fig. 1 in einer Vorderansicht, und
Fig. 3
eine Detailansicht der Bremskupplung der Lastaufnahmevorrichtung gemäß der Fig. 1.
It shows
Fig. 1:
An embodiment of a load receiving device according to the invention in a side view,
Fig. 2
the load receiving device according to the invention according to Fig. 1 in a front view, and
Fig. 3
a detailed view of the brake coupling of the load receiving device according to the Fig. 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur 1 ist eine Lastaufnahmevorrichtung, die von einer Unterflasche 10 für ein als Lastkran ausgebildetes Hebezeug (nicht gezeigt) gebildet ist, schematisch dargestellt. Die Lastaufnahmevorrichtung ist für eine Aufnahme von Lasten bis zu 80 t vorgesehen. Grundsätzlich kann die erfindungsgemäße Lastaufnahmevorrichtung aber auch für höhere Lasten als 80 t ausgelegt sein.In the FIG. 1 is a load-receiving device, which is formed by a lower block 10 for a lifting crane designed as a crane (not shown), shown schematically. The load handling device is designed to accommodate loads up to 80 t. In principle, the load bearing device according to the invention can also be designed for higher loads than 80 t.

Die Lastaufnahmevorrichtung weist zur Aufhängung an einen Seilzug eine Aufhängeeinheit 12 auf. Die Aufhängeeinheit 12 umfasst zwei parallel beabstandete Grundplatten 14, 14' aus Eisen und eine Traverse 18 (Fig. 2). An jeder der Grundplatten 14, 14' ist ein von der jeweils anderen Grundplatte 14', 14 abgewandter Scheibenkästen 24, 24' angebracht, der einen Hohlraum zur Aufnahme von Seilscheiben 26 ausbildet. In jedem der Scheibenkästen 24, 24' sind zwei Seilscheiben 26 konzentrisch mit einer in einem betriebsbereiten Zustand horizontal ausgerichteten Welle 34 starr gekoppelt, deren Enden in jeweils einem als Drehlager ausgebildeten Lager 36, 36', die in einem oberen Bereich jeder der Grundplatten 14, 14' ausgebildet sind, mit fluchtenden, horizontalen Lagerachsen 38, 38' drehbar gelagert ist. Die Seilscheiben 26 weisen an ihrem äußeren Umfang jeweils eine umlaufende Rille 28 zur Aufnahme eines Hubseils auf, so dass im betriebsbereiten Zustand zwei Hubseile von oben in bekannter Weise mehrfach in den jeweiligen Scheibenkasten 24, 24' ein- und nach Umlauf um eine der Seilscheiben 26 nach oben aus dem Scheibenkasten 24, 24' austreten und derart den Seilzug bilden, mittels dessen die Unterflasche 10 mit einer Oberflasche (nicht dargestellt) einen Flaschenzug bildet und zur Ausführung einer Hebe- oder Senkbewegung durch eine Verstellung des Hubseils verbunden ist.The load-carrying device has a suspension unit 12 for suspension on a cable pull. The suspension unit 12 comprises two parallel spaced base plates 14, 14 'made of iron and a traverse 18 (FIG. Fig. 2 ). At each of the base plates 14, 14 'is one of the other base plate 14', 14 facing away from Disk boxes 24, 24 'attached, which forms a cavity for receiving pulleys 26. In each of the disc cases 24, 24 'are two pulleys 26 concentrically coupled to a horizontally oriented in an operative state of the shaft 34, the ends of each in a pivot bearing designed as a bearing 36, 36', in an upper region of each of the base plates 14, 14 'are formed, with aligned, horizontal bearing axles 38, 38' is rotatably mounted. The pulleys 26 have on their outer circumference in each case a circumferential groove 28 for receiving a hoisting rope, so that in the ready state two hoisting ropes from above in a known manner several times in the respective disc box 24, 24 'on and after circulation around one of the pulleys 26th go up from the disc box 24, 24 'and thus form the cable, by means of which the lower block 10 (not shown) forms a pulley with a top bottle and is connected to perform a lifting or lowering movement by an adjustment of the hoisting rope.

Die Lastaufnahmevorrichtung umfasst ferner einen als Doppelhaken ausgeführten Lasthaken 30, an dem zwischen den Hakenspitzen ein nach oben gerichteter, im Wesentlichen zylindrischer Lasthakenschaft 32 einstückig angeformt ist. Im betriebsbereiten Zustand ist der Lasthakenschaft 32 in bekannter Weise durch ein Durchgangsloch 22 der Traverse 18 der Aufhängeeinheit 12 geführt. Die Traverse 18 weist seitlich horizontal ausgerichtete Lagerbolzen 20, 20' auf. Die Aufhängeeinheit 12 umfasst ferner in einem den Scheibenkästen 24, 24' abgewandten, unteren Bereich der Grundplatten 14, 14' erste Lager 40, 40' mit im Wesentlichen horizontal angeordneten, fluchtenden Lagerachsen 42, 42'. Im betriebsbereiten Zustand sind die Lagerbolzen 20, 20' der Traverse 18 in den ersten Lagern 40, 40' der Aufhängeeinheit 12 gelagert.The load receiving device further comprises a hook designed as a double hook 30, on which an upwardly directed, substantially cylindrical load hook shaft 32 is integrally formed between the hook tips. In the ready state, the load hook shaft 32 is guided in a known manner through a through hole 22 of the traverse 18 of the suspension unit 12. The traverse 18 has laterally horizontally oriented bearing pins 20, 20 '. Furthermore, the suspension unit 12 comprises, in a lower region of the base plates 14, 14 'remote from the disc cases 24, 24', first bearings 40, 40 'with aligned bearing axes 42, 42' arranged substantially horizontally. In the ready state, the bearing pins 20, 20 'of the traverse 18 in the first bearings 40, 40' of the suspension unit 12 are stored.

Das dem Lasthaken 30 abgewandte Ende des Lasthakenschafts 32 ist im betriebsbereiten Zustand in bekannter Weise mit einer Hakenmutter versehen.The load hook 30 remote from the end of the load hook shaft 32 is provided in the ready state in a known manner with a hook nut.

An einer Oberseite der Traverse 18 ist die Aufhängeeinheit 12 in bekannter Weise mit einem als Wälzlager ausgebildeten zweiten Lager (nicht dargestellt) mit einer im Wesentlichen vertikal angeordneten Drehachse 44 ausgestattet, um die der Lasthaken 30 mittels eines Axiallagers an einer Unterseite (nicht dargestellt) der Hakenmutter im betriebsbereiten Zustand drehbar gelagert ist.At an upper side of the traverse 18, the suspension unit 12 in a known manner with a designed as a rolling bearing second bearing (not shown) equipped with a substantially vertically disposed pivot axis 44, by which the load hook 30 by means of a thrust bearing on a bottom (not shown) of Hook nut is rotatably mounted in the ready state.

Weiterhin weist die Lastaufnahmevorrichtung eine Bremskupplung 46 mit zwei Kupplungsteilen 48, 50 auf (Fig. 3). Das erste Kupplungsteil 48 der beiden Kupplungsteile 48, 50 ist im betriebsbereiten Zustand starr mit der Hakenmutter und damit auch starr mit dem Lasthaken 30 verbunden und umfasst an einem dem Lasthakenschaft 32 abgewandten Ende eine Mehrzahl von ersten, in Kreisringform ausgebildeten Anlageflächen 52. Die ersten Anlageflächen 52 weisen einen durch eine geeignete Oberflächenbehandlung erhöhten Gleit- und Haftreibungskoeffizienten auf.Furthermore, the load receiving device has a brake coupling 46 with two coupling parts 48, 50 ( Fig. 3 ). The first coupling part 48 of the two coupling parts 48, 50 is in the ready state rigidly connected to the hook nut and thus rigidly connected to the load hook 30 and comprises at a load hook shaft 32 remote from the end of a first plurality of annular contact surfaces 52. The first contact surfaces 52 have increased by a suitable surface treatment sliding and static friction coefficient.

Das zweite Kupplungsteil 50 der beiden Kupplungsteile 48, 50 umfasst eine Mehrzahl von zweiten, in Kreisringform ausgebildeten Anlageflächen 54, die ebenfalls einen durch eine geeignete Oberflächenbehandlung erhöhten Gleit- und Haftreibungskoeffizienten aufweisen. Die ersten Anlageflächen 52 und die zweiten Anlageflächen 54 sind dazu vorgesehen, zur kontrollierten Kopplung einer Drehbewegung des Lasthakens 30 relativ zur Aufhängeeinheit 12 um die vertikale Drehachse 44 zumindest in einem Betriebszustand zur gegenseitigen Anlage zu kommen. Die zwei Kupplungsteile 48, 50 sind an den ersten und zweiten Anlageflächen 52, 54 relativ zueinander reibungsüberwindend bewegbar. Dabei ist eine Bewegbarkeit der beiden Kupplungsteile 48, 50 von einer zwischen den ersten Anlageflächen 52 und den zweiten Anlageflächen 54 senkrecht wirkenden Normalkraft in Form einer Anpresskraft und einem Reibungskoeffizienten abhängig, der durch die Gleit- und Haftreibungskoeffizienten der ersten Anlageflächen 52 und der zweiten Anlageflächen 54 bestimmt ist.The second coupling part 50 of the two coupling parts 48, 50 comprises a plurality of second annular surfaces formed in contact surfaces 54, which also have an increased by a suitable surface treatment sliding and static friction coefficient. The first contact surfaces 52 and the second contact surfaces 54 are provided for the controlled coupling of a rotational movement of the load hook 30 relative to the suspension unit 12 about the vertical axis of rotation 44 to come at least in an operating state for mutual contact. The two coupling parts 48, 50 are on the first and second bearing surfaces 52, 54 relative to each other friction over movable. In this case, a mobility of the two coupling parts 48, 50 depends on a between the first contact surfaces 52 and the second contact surfaces 54 perpendicularly acting normal force in the form of a contact pressure and a coefficient of friction by the sliding and static friction coefficients of the first contact surfaces 52 and the second contact surfaces 54th is determined.

Zur Verstellung der Anpresskraft zwischen den relativ zueinander reibungsüberwindend beweglichen Kupplungsteilen 48, 50 weist die Bremskupplung 46 eine Verstellvorrichtung 56 auf. Dadurch ist eine wirksame Bremsreibkraft zwischen den Kupplungsteilen 48, 50 einstellbar, wie im Folgenden erläutert wird.To adjust the contact pressure between the friction parts movable relative to each other overcoming coupling parts 48, 50, the brake coupling 46 has an adjusting device 56. As a result, an effective brake friction between the coupling parts 48, 50 is adjustable, as will be explained below.

Die Verstellvorrichtung 56 umfasst einen elektrischen Aktor 58 zur Verstellung der relativen Position der Kupplungsteile 48, 50. Der elektrische Aktor 58 ist von einem Elektromotor gebildet, der lösbar fest zwischen den Grundplatten 14, 14' befestigt und dazu vorgesehen ist, bei einer Aktivierung ein zentrales, konzentrisch zur vertikalen Drehachse 44 an einer Unterseite des Elektromotors angeordnetes und mit einem Innengewinde versehenes Gewindeelement 60 in eine Drehung zu versetzen. An dem zweiten Kupplungsteil 50 ist an der dem Elektromotor zugewandten Oberseite ein zylindrischer Zapfen 62 angeformt, der mit einem Außengewinde ausgestattet ist, das sich im betriebsbereiten Zustand im formschlüssigen Eingriff mit dem korrespondierenden Innengewinde des Gewindeelements 60 befindet, so dass bei der Aktivierung des mit zwei Drehrichtungen ausgestatteten Elektromotors eine Änderung einer relativen Position der ersten Anlageflächen 52 und der zweiten Anlageflächen 54 und somit der beiden Kupplungsteile 48, 50 zueinander in beide Richtungen ermöglicht ist. Durch eine nicht dargestellte Federbelastung zwischen einer Oberseite des zweiten Kopplungsteils 50 und der Unterseite des Aktors 58 ist eine unerwünschte Drehung des zweiten Kupplungsteils 50 um die vertikale Drehachse 44 bei Betätigung des Aktors 58 verhindert.The adjusting device 56 comprises an electric actuator 58 for adjusting the relative position of the coupling parts 48, 50. The electric actuator 58 is formed by an electric motor which is releasably fixedly secured between the base plates 14, 14 'and intended to be central when activated to set in rotation about the vertical axis of rotation 44 arranged on an underside of the electric motor and provided with an internal thread threaded element 60. At the second coupling part 50 is at the the electric motor a cylindrical pin 62 formed on the upper side, which is provided with an external thread, which is in the operable state in positive engagement with the corresponding internal thread of the threaded member 60, so that upon activation of the equipped with two directions of rotation electric motor, a change in a relative position of the first Contact surfaces 52 and the second contact surfaces 54 and thus the two coupling parts 48, 50 allows each other in both directions. By a spring load, not shown, between an upper side of the second coupling part 50 and the underside of the actuator 58, an undesired rotation of the second coupling part 50 about the vertical axis of rotation 44 upon actuation of the actuator 58 is prevented.

Das zweite Kupplungsteil 50 ist im betriebsbereiten Zustand mittels des Elektromotors mit den Grundplatten 14, 14' und somit mit der Aufhängeeinheit 12 verbunden.The second coupling part 50 is connected in the ready state by means of the electric motor with the base plates 14, 14 'and thus with the suspension unit 12.

In einem ersten Betriebszustand, in dem die ersten Anlageflächen 52 und die zweiten Anlageflächen 54 sich nicht in gegenseitiger Anlage befinden, sondern vielmehr beabstandet sind, wie in der Fig. 3 dargestellt, ist die Kopplung der Drehbewegung des Lasthakens 30 relativ zur Aufhängeeinheit 12 freigegeben. In diesem ersten Betriebszustand, der einer Freigabestellung der Verstellvorrichtung 56 entspricht, ist der Lasthaken 30 relativ zur Aufhängeeinheit 12 um die vertikale Drehachse 44 frei drehbar. Die Freigabestellung ist vorteilhaft einsetzbar beim Anheben einer Last, um durch eine ausgleichende Drehbewegung des Lasthakens 30 um die vertikale Drehachse 44 ein Auftreten hoher Scherkräfte zu verhindern.In a first operating condition, in which the first abutment surfaces 52 and the second abutment surfaces 54 are not in abutment with one another, but rather are spaced apart, as in FIG Fig. 3 illustrated, the coupling of the rotational movement of the load hook 30 is released relative to the suspension unit 12. In this first operating state, which corresponds to a release position of the adjusting device 56, the load hook 30 is freely rotatable relative to the suspension unit 12 about the vertical axis of rotation 44. The release position can be advantageously used when lifting a load to prevent the occurrence of high shear forces by compensating rotational movement of the load hook 30 about the vertical axis of rotation 44.

In einem weiteren, zweiten Betriebszustand, in dem die ersten Anlageflächen 52 und die zweiten Anlageflächen 54 sich in gegenseitiger Anlage befinden und zwischen den ersten Anlageflächen 52 und den zweiten Anlageflächen 54 eine vorgegebene maximale Anpresskraft wirkt, ist die Drehbewegung des Lasthakens 30 relativ zur Aufhängeeinheit 12 durch eine vorgegebene Bremsreibkraft gebremst. Dieser zweite Betriebszustand entspricht einer Haltestellung der Verstellvorrichtung 56, in der die Drehbewegung des Lasthakens 30 um die vertikale Drehachse 44 mit einer vorgegebenen maximalen Bremsreibkraft gebremst ist. Die Haltestellung ist vorteilhaft einsetzbar bei einem Positionieren einer Last, wenn eine mechanische Kopplung zwischen Lasthaken 30 und Aufhängeeinheit 12 gewünscht ist, die als eine starre Verbindung wirksam ist.In a further, second operating state, in which the first contact surfaces 52 and the second contact surfaces 54 are in mutual contact and between the first contact surfaces 52 and the second contact surfaces 54 a predetermined maximum contact force acts, the rotational movement of the load hook 30 relative to the suspension unit 12th slowed down by a given brake friction force. This second operating state corresponds to a holding position of the adjusting device 56, in which the rotational movement of the load hook 30 is braked about the vertical axis of rotation 44 with a predetermined maximum braking frictional force. The holding position can be advantageously used when positioning a load, if a mechanical coupling between load hook 30 and suspension unit 12 is desired, which is effective as a rigid connection.

Mittels des elektrischen Aktors 58 ist die Verstellvorrichtung 56 zwischen der Freigabestellung und der Haltestellung reversibel verbringbar. Des Weiteren sind durch Betätigung des Aktors 58 und somit der Verstellvorrichtung 56 auch beliebige Zwischenwerte für die Bremsreibkraft zwischen einer Bremsreibkraft nahe Null in der Freigabestellung der Verstellvorrichtung 56 und der maximalen Bremsreibkraft in der Haltestellung der Verstellvorrichtung 56 einstellbar.By means of the electric actuator 58, the adjusting device 56 can be reversibly moved between the release position and the holding position. Furthermore, by operation of the actuator 58 and thus of the adjusting device 56, any intermediate values for the brake friction force between a brake friction force close to zero in the release position of the adjusting device 56 and the maximum braking friction force in the holding position of the adjusting device 56 can be adjusted.

Dadurch, dass die Bremskupplung 46 weitgehend mit ihren Hauptteilen in einem von den beabstandeten Grundplatten 14, 14' der Aufhängeeinheit 12 gebildeten Schutzraum 16 angeordnet ist, kann ein mechanischer Schutz für die Bremskupplung 46 bereitgestellt werden.Due to the fact that the brake coupling 46 is arranged largely with its main parts in a protective space 16 formed by the spaced base plates 14, 14 'of the suspension unit 12, a mechanical protection for the brake coupling 46 can be provided.

Liste der Bezugszeichen

10
Unterflasche
12
Aufhängeeinheit
14
Grundplatte
16
Schutzraum
18
Traverse
20
Lagerbolzen (Traverse)
22
Durchgangsloch
24
Scheibenkasten
26
Seilscheibe
28
Rille
30
Lasthaken
32
Lasthakenschaft
34
Welle
36
Lager (oberes Dreh-)
38
Lagerachse (oben)
40
Lager (unten)
42
Lagerachse (unten)
44
vertikale Drehachse
46
Bremskupplung
48
erstes Kupplungsteil
50
zweites Kupplungsteil
52
erste Anlageflächen
54
zweite Anlageflächen
56
Verstellvorrichtung
58
Aktor
60
Gewindeelement
62
Zapfen
List of reference numbers
10
Bottom block
12
suspension unit
14
baseplate
16
shelter
18
traverse
20
Bearing bolt (traverse)
22
Through Hole
24
disc box
26
sheave
28
groove
30
load hook
32
Lifting hook shaft
34
wave
36
Bearing (upper turning)
38
Bearing axis (top)
40
Warehouse (below)
42
Bearing axis (below)
44
vertical axis of rotation
46
brake clutch
48
first coupling part
50
second coupling part
52
first contact surfaces
54
second contact surfaces
56
adjustment
58
actuator
60
threaded element
62
spigot

Claims (8)

Lastaufnahmevorrichtung, insbesondere Unterflasche (10) für ein Hebezeug, und insbesondere zur Verwendung mit zumindest einem Seilzug, umfassend: - einen Lasthaken (30), - eine Traverse (18), - eine Aufhängeeinheit (12) zur Aufhängung der Lastaufnahmevorrichtung an zumindest einen Seilzug,
wobei die Aufhängeeinheit (12) erste Lager (40) mit im Wesentlichen horizontal angeordneter Lagerachse (42) zur Aufnahme der Traverse (18) aufweist,
und wobei die Aufhängeeinheit (12) ein zweites Lager mit einer im Wesentlichen vertikal angeordneten Drehachse (44) aufweist, um die der Lasthaken (30) in einem betriebsbereiten Zustand drehbar gelagert ist, gekennzeichnet durch
eine Bremskupplung (46) mit zumindest zwei Kupplungsteilen (48, 50), die jeweils mindestens eine Anlagefläche (52, 54) umfassen, wobei die Anlageflächen (52, 54) in zumindest einem Betriebszustand zur gegenseitigen Anlage kommen und die zwei Kupplungsteile (48, 50) an den Anlageflächen (52, 54) relativ zueinander reibungsüberwindend bewegbar sind, wobei das erste der beiden Kupplungsteile (48) mit dem Lasthaken (30) und das zweite der beiden Kupplungsteile (50) mit der Aufhängeeinheit (12) verbunden ist, zur kontrollierten Kopplung einer Drehbewegung des Lasthakens (30) relativ zur Aufhängeeinheit (12) um die vertikale Drehachse (44). Load-receiving device, in particular lower block (10) for a hoist, and in particular for use with at least one cable, comprising: a load hook (30), a traverse (18), a suspension unit (12) for suspending the load-carrying device at least one cable pull,
wherein the suspension unit (12) has first bearings (40) with a substantially horizontally arranged bearing axle (42) for receiving the traverse (18),
and wherein the suspension unit (12) comprises a second bearing having a substantially vertically arranged axis of rotation (44) about which the load hook (30) is rotatably mounted in an operative condition, characterized by
a brake coupling (46) having at least two coupling parts (48, 50), each comprising at least one contact surface (52, 54), wherein the contact surfaces (52, 54) come into mutual contact in at least one operating state and the two coupling parts (48, 50) on the contact surfaces (52, 54) relative to each other friction over movable, wherein the first of the two coupling parts (48) with the load hook (30) and the second of the two coupling parts (50) is connected to the suspension unit (12) controlled coupling of a rotational movement of the load hook (30) relative to the suspension unit (12) about the vertical axis of rotation (44). Lastaufnahmevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Bremskupplung (46) zumindest eine Verstellvorrichtung (56) zur Verstellung einer Anpresskraft zwischen den relativ zueinander reibungsüberwindend beweglichen Kupplungsteilen (48, 50) aufweist, mittels der eine wirksame Bremsreibkraft zwischen den Kupplungsteilen (48, 50) einstellbar ist.Load-receiving device according to claim 1, characterized in that the brake coupling (46) has at least one adjusting device (56) for adjusting a contact pressure between the coupling parts (48, 50) which move relative to each other by friction braking between the coupling parts (48, 50) ) is adjustable. Lastaufnahmevorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Verstellvorrichtung (56) zumindest zwischen einer Freigabestellung, in der die Drehbewegung des Lasthakens (30) relativ zur Aufhängeeinheit (12) freigegeben ist, und einer Haltestellung, bei der die Drehbewegung des Lasthakens (30) relativ zur Aufhängeeinheit (12) durch eine vorgegebene Bremsreibkraft gebremst ist, verbringbar ist.Load-receiving device according to claim 1 or 2, characterized in that the adjusting device (56) at least between a release position in which the rotational movement of the load hook (30) is released relative to the suspension unit (12), and a holding position in which the rotational movement of the load hook ( 30) is braked relative to the suspension unit (12) by a predetermined braking frictional force, can be brought. Lastaufnahmevorrichtung zumindest nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verstellvorrichtung (56) einen elektrischen Aktor (58) zur Verstellung der relativen Position der Kupplungsteile (48, 50) zueinander umfasst.Load-receiving device according to at least one of the preceding claims, characterized in that the adjusting device (56) comprises an electric actuator (58) for adjusting the relative position of the coupling parts (48, 50) to each other. Lastaufnahmevorrichtung zumindest nach Anspruch 4, dadurch gekennzeichnet, dass die Verbringung der Verstellvorrichtung (56) zwischen der Haltestellung und der Freigabestellung mittels des elektrischen Aktors (58) betätigbar ist.Load-receiving device at least according to claim 4, characterized in that the movement of the adjusting device (56) between the holding position and the release position by means of the electric actuator (58) is actuated. Lastaufnahmevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die relativ zueinander reibungsüberwindend beweglichen Kupplungsteile (48, 50) eine Mehrzahl von Anlageflächen (52, 54) aufweisen, die dazu vorgesehen sind, in dem zumindest einen Betriebszustand zur gegenseitigen Anlage zu gelangen.Load-bearing device according to one of the preceding claims,
characterized in that the coupling parts (48, 50) movable relative to each other have a plurality of contact surfaces (52, 54) which are intended to come into mutual mutual contact in the at least one operating state. Lastaufnahmevorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Bremskupplung (46) zumindest teilweise in einem von der Aufhängeeinheit (12) gebildeten Schutzraum (16) angeordnet ist.Load-bearing device according to one of the preceding claims,
characterized in that the brake coupling (46) is arranged at least partially in a protective space (16) formed by the suspension unit (12). Flaschenzug, insbesondere zur Verwendung an einem Kran, mit zumindest einer Lastaufnahmevorrichtung nach einem der vorhergehenden Ansprüche.Pulley, in particular for use on a crane, with at least one load-carrying device according to one of the preceding claims.
EP13183659.5A 2012-09-11 2013-09-10 Load bearing device, in particular lower pulley block for a lifting device Active EP2706032B1 (en)

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DE201210108486 DE102012108486A1 (en) 2012-09-11 2012-09-11 Load-receiving device, in particular lower block for a hoist

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DE2853404A1 (en) * 1978-12-11 1980-06-19 Pohlig Heckel Bleichert Safety lower sheave for overhead cranes - has top support with housing for roller shaft for top rollers and bottom support for bottom roller supports
DE3234395A1 (en) * 1982-09-16 1984-03-22 F.T. Industries Co., Ltd., Fukuyama, Hiroshima Radio-controlled, pivotable load hook arrangement
EP1454870A2 (en) * 2003-03-06 2004-09-08 Demag Cranes & Components GmbH Suspension means for a lifting hook

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Publication number Priority date Publication date Assignee Title
CN104071691A (en) * 2014-07-11 2014-10-01 常熟市港城船舶附件厂 Multifunctional double-hook lifting hook

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