EP0338323B1 - Grab for a hoist - Google Patents

Grab for a hoist Download PDF

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Publication number
EP0338323B1
EP0338323B1 EP89105972A EP89105972A EP0338323B1 EP 0338323 B1 EP0338323 B1 EP 0338323B1 EP 89105972 A EP89105972 A EP 89105972A EP 89105972 A EP89105972 A EP 89105972A EP 0338323 B1 EP0338323 B1 EP 0338323B1
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EP
European Patent Office
Prior art keywords
gripping device
protective device
gripper
covering
bunker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89105972A
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German (de)
French (fr)
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EP0338323A1 (en
Inventor
Heinz-Jürgen Dipl.-Ing. Berwein
Wolfgang Dipl.-Ing. Neubert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Publication date
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Priority to AT89105972T priority Critical patent/ATE70028T1/en
Publication of EP0338323A1 publication Critical patent/EP0338323A1/en
Application granted granted Critical
Publication of EP0338323B1 publication Critical patent/EP0338323B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/04—Tine grabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/02—Bucket grabs

Definitions

  • the invention relates to a gripper for a hoist, in particular for use in a waste treatment plant.
  • Hoists of the type considered here are used, among other things, in thermal waste disposal plants.
  • the hoists are used to bring the delivered waste into a larger waste collection container, an intermediate storage facility or a bunker and / or to lift it out so that it can be recycled.
  • Other waste treatment plants e.g. Garbage intermediate stations are equipped with bunkers that are operated with hoists.
  • bunkers are usually made of concrete, i.e. a relatively hard material. If the gripper strikes the concrete wall, the concrete can be damaged during operation. Damage can also occur to the gripper itself.
  • a Bongossi wooden cladding is occasionally chosen for the bunker area. This serves the sole purpose of protecting the bunker concrete from damage by the striking gripper.
  • Such wooden cladding is relatively expensive. In the case of fires in the garbage, the wooden cladding can be damaged or even completely destroyed.
  • the object of the invention is to provide much more cost-effective measures by which the bunker concrete is protected from damage by the striking gripper.
  • the gripper itself should also be protected from damage.
  • the gripper is provided with an elastic protective device in the region of its outer contact surfaces.
  • the gripper of the hoist itself is present, e.g. of a crane or trolley, equipped with a protective device.
  • This protective device is arranged on the outside in the area of the contact surfaces between the open and also the closed gripper on the one hand and the concrete wall of the bunker on the other.
  • the protective device preferably comprises a number of elastic pads or buffers which are suitably fastened on the outside on the contact surfaces of the gripper, for example by screwing, vulcanizing or gluing.
  • These pads or buffers are preferably elastic on the inside and comparatively hard on the outside. They can be designed in particular as multi-layer rubber cladding.
  • Another elastic protective device preferably comprises a resilient covering. This can in particular have an outer covering part which is resiliently held on the surface of the gripper. When the gripper strikes the bunker wall, the cladding part yields resiliently.
  • an elastic protective device preferably in the form of a plurality of elastic pads or rubber buffers or in the form of a resilient covering, on the gripper
  • the bunker is protected from damage in a much more cost-effective manner than damage by wooden cladding.
  • a certain bunker volume namely the portion that is allotted to the wooden cladding, is saved.
  • Bunker fires do not incur unnecessary costs by replacing damaged wooden cladding. System downtimes due to repair work on the wood cladding can be avoided; when the gripper cladding is replaced, the waste treatment system can be kept in operation with the aid of a reserve hoist that is usually available. This is of enormous economic importance.
  • Fig. 1 the bunker of a thermal waste disposal system shown in a side view is designated by 2.
  • a hoist 6 in particular a trolley, runs on a horizontal rail 4.
  • the hoist 6 is equipped with a gripper 8, which is shown once in the closed and once in the open representation.
  • the walls of the bunker 2 are made of concrete. They must be protected from damage caused by the gripper 8 striking during operation.
  • the gripper 8 is provided with an elastic protective device in the area of its external contact surfaces - these are the surface parts of the gripper 8 with which it could touch the concrete walls of the bunker 2 in the open and closed position is generally designated 10.
  • the protective device 10 comprises a number of cushions 12 for protecting the concrete in the closed gripper position and a number of cushions 14 for protection in the open gripper position.
  • the individual pads or buffers 12, 14 are elastic on the inside and comparatively hard on the outside.
  • the buffers 12, 14 each consist of a multi-layer rubber arrangement.
  • the individual buffers 12, 14 are glued on the outside to the contact surfaces, vulcanized or screwed to the relevant gripper parts with countersunk bolts. Depending on the design of the buffers 12, 14, welding or riveting is also possible. In addition, they are rounded on the outside to avoid premature wear. Both the gluing and vulcanization and the screwing together make it possible to replace the pads 12, 14 after a certain period of wear.
  • the pads 12 can in particular be U-shaped parts which make the gripper joints movable.
  • a single pad 14 is shown in section. Here you can see again that this is rounded towards the outside.
  • it consists of two rubber layers 16 and 18, of which the inner layer 16 is a soft rubber and the outer layer 18 is a hard rubber.
  • the hard rubber protects it Soft rubber from damage.
  • the rubber cushion 14 is arranged on the outer contact surface 20 of a claw 22 of the gripper 8, for example fastened by gluing.
  • fastening by means of at least one countersunk screw 24 can also be provided.
  • a plurality of screws 24 are preferably used.
  • a washer 26 may be provided in the rubber layer 18 to protect this rubber layer 18. The screw 24 should be secured against twisting.
  • FIG. 3 shows part of a resilient covering 30 as a protective device for the claw 22 of a gripper 8.
  • the lining 30 comprises as essential elements a spacer sleeve 32 with a washer 34 formed on the head side, a plate spring 36 which forms a closed spring chamber 37 which is protected from dirt, so that no blocking by dirt residues can occur, a washer 38 and a screw 40.
  • the heads the parts 32 and 40 are housed together in the depression of a recess (counterbore) 42 of a trim part 44 made of plastic or hardwood.
  • the spacer sleeve 32 rests with its foot on the surface 20 of the claw 22. The end of the foot can be adapted to the surface shape.
  • the plate spring 36 and the washer 38 are located between the surface 20 and the side of the cladding part 44 facing this surface 20. They are both pushed onto the foot of the spacer sleeve 32. The edge of the plate spring 36 lies on the surface 20. The washer 38 protects the trim part 44 from excessive stress.
  • another spring can also be used Underlay, such as a coil spring, can be used.
  • the trim part 44 is rounded to the outside. The foot of the screw 40 inserted through the spacer sleeve 32 is screwed into the claw 22 and secured in this claw 22, for example by welding spot, nut or adhesive securing.
  • a sleeve that corresponds to the sleeve 32 can preferably also be provided in the embodiment according to FIG. 2 instead of the washer 26.
  • the trim part 44 is provided with a plurality of spring devices 34, 36, 38, 40 which determine its resilient effect. These spring devices can be arranged side by side in a row.
  • the covering part 44 together with the washer 38 moves against the force of the plate spring 36 along the spacer sleeve 32 in the direction of the surface 20.
  • the impact energy is generated by the various spring devices 34 to 40 , but also caught by the surface deformation of the trim part 44.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Control And Safety Of Cranes (AREA)
  • Manipulator (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Types And Forms Of Lifts (AREA)

Abstract

In the case of a conventional grab, e.g. of a crane, there is the risk, when working in a scrap bunker, of this grab striking the wall of the scrap bunker and damaging the concrete in the process. In order to provide a remedy here, it is proposed according to the invention that the grab (8) be provided on the outside with elastic cushions (12, 14) or flexible linings (30) at the points where it could strike the wall. In this way, the impact energy can be absorbed. The hitherto conventional expensive lining with a wooden casing is thus dispensed with. The cushions (12, 14) and linings (30) can easily be exchanged when required without the operation of the scrap-handling plant having to be interrupted. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Greifer für ein Hebezeug, insbesondere zum Einsatz in einer Abfallbehandlungsanlage.The invention relates to a gripper for a hoist, in particular for use in a waste treatment plant.

Hebezeuge der hier betrachteten Art werden unter anderem in thermischen Abfallbeseitigungsanlagen eingesetzt. Die Hebezeuge dienen dort dazu, den angelieferten Abfall in einen größeren Abfall-Sammelbehälter, ein Zwischenlager oder einen Bunker einzubringen und/oder aus diesem herauszuheben, um ihn der eigentlichen Abfallverwertung zuzuführen. Auch andere Abfallbehandlungsanlagen, z.B. Müll-Zwischenstationen, sind mit Bunkern ausgerüstet, die mit Hebezeugen bedient werden.Hoists of the type considered here are used, among other things, in thermal waste disposal plants. The hoists are used to bring the delivered waste into a larger waste collection container, an intermediate storage facility or a bunker and / or to lift it out so that it can be recycled. Other waste treatment plants, e.g. Garbage intermediate stations are equipped with bunkers that are operated with hoists.

Solche Bunker sind in der Regel aus Beton gefertigt, also aus einem relativ harten Material. Beim Schlagen des Greifers gegen die Betonwand kann im Betrieb der Beton beschädigt werden. Beschädigungen können auch am Greifer selbst auftreten.Such bunkers are usually made of concrete, i.e. a relatively hard material. If the gripper strikes the concrete wall, the concrete can be damaged during operation. Damage can also occur to the gripper itself.

Um den Beton eines solchen Bunkers vor mechanischen Beschädigungen zu schützen, wird gelegentlich eine Bongossi-Holzverkleidung des Bunkerbereiches gewählt. Diese dient also ausschließlich dem Zweck, den Bunkerbeton vor Beschädigungen durch den anschlagenden Greifer zu schützen. Eine solche Holzverkleidung ist relativ teuer. Bei Bränden im Müll kann die Holzverkleidung beschädigt oder sogar ganz zerstört werden.In order to protect the concrete of such a bunker from mechanical damage, a Bongossi wooden cladding is occasionally chosen for the bunker area. This serves the sole purpose of protecting the bunker concrete from damage by the striking gripper. Such wooden cladding is relatively expensive. In the case of fires in the garbage, the wooden cladding can be damaged or even completely destroyed.

Aufgabe der Erfindung ist es, wesentlich kostengünstigere Maßnahmen anzugeben, durch die der Bunkerbeton vor Beschädigungen durch den anschlagenden Greifer geschützt wird. Darüber hinaus soll der Greifer selbst ebenfalls vor Schäden bewahrt werden.The object of the invention is to provide much more cost-effective measures by which the bunker concrete is protected from damage by the striking gripper. In addition, the gripper itself should also be protected from damage.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Greifer im Bereich seiner außen liegenden Berührungsflächen mit einer elastischen Schutzeinrichtung versehen ist.This object is achieved in that the gripper is provided with an elastic protective device in the region of its outer contact surfaces.

Vorliegend ist also statt des Bunkers der Greifer des Hebezeuges selbst, also z.B. eines Kranes oder einer Laufkatze, mit einer Schutzeinrichtung ausgerüstet. Diese Schutzeinrichtung ist außen im Bereich der Berührungsflächen zwischen dem offenen und auch dem geschlossenen Greifer einerseits und der Betonwand des Bunkers andererseits angeordnet.Instead of the bunker, the gripper of the hoist itself is present, e.g. of a crane or trolley, equipped with a protective device. This protective device is arranged on the outside in the area of the contact surfaces between the open and also the closed gripper on the one hand and the concrete wall of the bunker on the other.

Bevorzugt umfaßt die Schutzeinrichtung eine Anzahl von elastischen Polstern oder Puffern, die außen auf den Berührungsflächen des Greifers geeignet befestigt sind, beispielsweise durch Verschrauben, Vulkanisieren oder Verkleben. Vorzugsweise sind diese Polster oder Puffer innen elastisch und außen vergleichsweise hart ausgebildet. Sie können dabei insbesondere als Mehrschicht-Gummiverkleidungen ausgebildet sein.The protective device preferably comprises a number of elastic pads or buffers which are suitably fastened on the outside on the contact surfaces of the gripper, for example by screwing, vulcanizing or gluing. These pads or buffers are preferably elastic on the inside and comparatively hard on the outside. They can be designed in particular as multi-layer rubber cladding.

Eine weitere elastische Schutzeinrichtung umfaßt bevorzugt eine federnde Verkleidung. Diese kann insbesondere ein äußeres Verkleidungsteil besitzen, das federnd an der Oberfläche des Greifers gehalten ist. Beim Anschlagen des Greifers an die Bunkerwand gibt das verkleidungsteil federnd nach.Another elastic protective device preferably comprises a resilient covering. This can in particular have an outer covering part which is resiliently held on the surface of the gripper. When the gripper strikes the bunker wall, the cladding part yields resiliently.

Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen gekennzeichnet.Further advantageous refinements are characterized in the subclaims.

Die Anordnung einer elastischen Schutzeinrichtung, bevorzugt in Form einer Vielzahl von elastischen Polstern oder Gummipuffern oder in Form einer federnden Verkleidung, am Greifer hat den Vorteil, daß der Bunker gegen Beschädigungen auf wesentlich kostengünstigere Art und Weise vor Beschädigungen geschützt ist als durch eine Holzverkleidung. Darüber hinaus wird ein gewisses Bunkervolumen, nämlich der Anteil, der auf die Holzverkleidung entfällt, eingespart. Bei Bunkerbränden entstehen keine unnötigen Kosten durch Ersatz einer beschädigten Holzverkleidung. Anlagenstillstände durch Reparaturarbeiten an der Holzverkleidung können vermieden werden; bei Austausch der Greifer-Verkleidung kann die Abfallbehandlungsanlage mit Hilfe eines üblicherweise vorhandenen Reserve-Hebezeuges weiter in Betrieb gehalten werden. Dies ist von enormer wirtschaftlicher Bedeutung.The arrangement of an elastic protective device, preferably in the form of a plurality of elastic pads or rubber buffers or in the form of a resilient covering, on the gripper Advantage that the bunker is protected from damage in a much more cost-effective manner than damage by wooden cladding. In addition, a certain bunker volume, namely the portion that is allotted to the wooden cladding, is saved. Bunker fires do not incur unnecessary costs by replacing damaged wooden cladding. System downtimes due to repair work on the wood cladding can be avoided; when the gripper cladding is replaced, the waste treatment system can be kept in operation with the aid of a reserve hoist that is usually available. This is of enormous economic importance.

Ausführungsbeispiele der Erfindung sind in drei Figuren dargestellt und werden im folgenden näher erläutert.Embodiments of the invention are shown in three figures and are explained in more detail below.

Es zeigen:

Fig. 1
eine Krananlage zum Einsatz in einer Abfallbeseitigungsanlage mit einer Anzahl von außen am Greifer angebrachten elastischen Puffern;
Fig. 2
einen elastischen Puffer, der aus mehreren Schichten aufgebaut ist, in einer Schnittdarstellung; und
Fig. 3
eine federnde Verkleidung für einen Greifer in einer Schnittdarstellung.

Show it:
Fig. 1
a crane system for use in a waste disposal system with a number of elastic buffers attached to the outside of the gripper;
Fig. 2
an elastic buffer, which is composed of several layers, in a sectional view; and
Fig. 3
a resilient cladding for a gripper in a sectional view.

In Fig. 1 ist der in einer seitlichen Darstellung gezeigte Bunker einer thermischen Abfallbeseitigungsanlage mit 2 bezeichnet. Im Bunker 2 läuft auf einer horizontalen Schiene 4 ein Hebezeug 6, insbesondere eine Laufkatze. Das Hebezeug 6 ist mit einem Greifer 8 ausgerüstet, der einmal in geschlossener und einmal in geöffneter Darstellung gezeigt ist. Die Wände des Bunkers 2 bestehen aus Beton. Sie sind vor Beschädigungen durch den im Betrieb anschlagenden Greifer 8 zu schützen.In Fig. 1, the bunker of a thermal waste disposal system shown in a side view is designated by 2. In the bunker 2, a hoist 6, in particular a trolley, runs on a horizontal rail 4. The hoist 6 is equipped with a gripper 8, which is shown once in the closed and once in the open representation. The walls of the bunker 2 are made of concrete. They must be protected from damage caused by the gripper 8 striking during operation.

Um dieses mit relativ geringen Kosten zu erreichen, ist der Greifer 8 im Bereich seiner außenliegenden Berührungsflächen ― dies sind die Oberflächenteile des Greifers 8, mit denen er in offener und geschlossener Position die Betonwände des Bunkers 2 berühren könnte ― mit einer elastischen Schutzeinrichtung versehen, die allgemein mit 10 bezeichnet ist. Speziell umfaßt die Schutzeinrichtung 10 eine Anzahl von Polstern 12 zum Schutz des Betons in der geschlossenen Greiferstellung und eine Anzahl von Polstern 14 zum Schutz in der geöffneten Greiferstellung.In order to achieve this at a relatively low cost, the gripper 8 is provided with an elastic protective device in the area of its external contact surfaces - these are the surface parts of the gripper 8 with which it could touch the concrete walls of the bunker 2 in the open and closed position is generally designated 10. Specifically, the protective device 10 comprises a number of cushions 12 for protecting the concrete in the closed gripper position and a number of cushions 14 for protection in the open gripper position.

Die einzelnen Polster oder Puffer 12, 14 sind innen elastisch und außen vergleichsweise hart ausgebildet. Insbesondere bestehen die Puffer 12, 14 jeweils aus einer Mehrschicht-Gummianordnung.The individual pads or buffers 12, 14 are elastic on the inside and comparatively hard on the outside. In particular, the buffers 12, 14 each consist of a multi-layer rubber arrangement.

Die einzelnen Puffer 12, 14 sind außen auf die Berührungsflächen aufgeklebt, aufvulkanisiert oder an den betreffenden Greiferteilen mit versenkten Bolzen verschraubt. Je nach Ausbildung der Puffer 12, 14 ist auch ein Verschweißen oder Vernieten möglich. Darüber hinaus sind sie nach außen hin abgerundet, um einen vorzeitigen Verschleiß zu vermeiden. Sowohl das Verkleben und Aufvulkanisieren als auch das Verschrauben ermöglicht es, die Polster 12, 14 nach einer gewissen Abnutzungszeit auszutauschen. Bei den Polstern 12 kann es sich insbesondere um U-förmig ausgebildete Teile handeln, die die Greifergelenke beweglich lassen.The individual buffers 12, 14 are glued on the outside to the contact surfaces, vulcanized or screwed to the relevant gripper parts with countersunk bolts. Depending on the design of the buffers 12, 14, welding or riveting is also possible. In addition, they are rounded on the outside to avoid premature wear. Both the gluing and vulcanization and the screwing together make it possible to replace the pads 12, 14 after a certain period of wear. The pads 12 can in particular be U-shaped parts which make the gripper joints movable.

In Fig. 2 ist ein einzelnes Polster 14 im Schnitt dargestellt. Hier ist wieder ersichtlich, daß dieses nach außen hin abgerundet ist. Es besteht vorliegend aus zwei Gummischichten 16 und 18, wovon die innere Schicht 16 ein Weichgummi und die äußere Schicht 18 ein Hartgummi ist. Das Hartgummi schützt das Weichgummi vor Beschädigung. Im vorliegenden Beispiel ist das Gummipolster 14 auf der außen liegenden Berührungsfläche 20 einer Kralle 22 des Greifers 8 angeordnet, beispielsweise durch Verkleben befestigt. Zusätzlich oder ersatzweise kann auch eine Befestigung mittels zumindest einer versenkbaren Schraube 24 vorgesehen sein. Bevorzugt wird eine Vielzahl von Schrauben 24 eingesetzt. Eine Unterlegscheibe 26 kann in der Gummischicht 18 vorgesehen sein, um diese Gummischicht 18 zu schützen. Die Schraube 24 sollte gegen Verdrehen gesichert sein.In Fig. 2, a single pad 14 is shown in section. Here you can see again that this is rounded towards the outside. In the present case, it consists of two rubber layers 16 and 18, of which the inner layer 16 is a soft rubber and the outer layer 18 is a hard rubber. The hard rubber protects it Soft rubber from damage. In the present example, the rubber cushion 14 is arranged on the outer contact surface 20 of a claw 22 of the gripper 8, for example fastened by gluing. In addition or as an alternative, fastening by means of at least one countersunk screw 24 can also be provided. A plurality of screws 24 are preferably used. A washer 26 may be provided in the rubber layer 18 to protect this rubber layer 18. The screw 24 should be secured against twisting.

Schlägt die Kralle 22 gegen eine Betonwand an, so ist diese durch die puffernde oder elastische Wirkung des Polsters 14 vor Beschädigungen geschützt.If the claw 22 strikes against a concrete wall, this is protected from damage by the buffering or elastic effect of the cushion 14.

In Fig. 3 ist ein Teil einer federnden Verkleidung 30 als Schutzeinrichtung für die Kralle 22 eines Greifers 8 gezeigt. Die Verkleidung 30 umfaßt als wesentliche Elemente eine Abstandshülse 32 mit kopfseitig angeformter Scheibe 34, eine Tellerfeder 36, die einen geschlossenen, vor Schmutz geschützten Federraum 37 bildet, so daß keine Blockierung durch Schmutzreste auftreten kann, eine Unterlegscheibe 38 und eine Schraube 40. Die Köpfe der Teile 32 und 40 sind gemeinsam in der Absenkung einer Ausnehmung (Senkbohrung) 42 eines Verkleidungsteiles 44 aus Kunststoff oder Hartholz untergebracht. Die Abstandshülse 32 liegt mit ihrem Fuß auf der Oberfläche 20 der Kralle 22 auf. Der Fuß kann endseitig der Oberflächenform angepaßt sein. Die Tellerfeder 36 und die Unterlegscheibe 38 befinden sich dabei zwischen der Oberfläche 20 und der dieser Oberfläche 20 zugewandten Seite des Verkleidungsteiles 44. Sie sind beide auf den Fuß der Abstandshülse 32 aufgeschoben. Dabei liegt der Rand der Tellerfeder 36 auf der Oberfläche 20 auf. Die Unterlegscheibe 38 schützt das Verkleidungsteil 44 vor zu hoher Beanspruchung. Anstelle der Tellerfeder 36 kann auch eine andere federnde Unterlage, z.B. eine Spiralfeder, verwendet werden. Das Verkleidungsteil 44 ist nach außen abgerundet. Der Fuß der durch die Abstandshülse 32 gesteckten Schraube 40 ist in die Kralle 22 eingeschraubt und in dieser Kralle 22 gesichert, z.B. durch Schweißpunkt-, Mutter- oder Klebe-Sicherung.FIG. 3 shows part of a resilient covering 30 as a protective device for the claw 22 of a gripper 8. The lining 30 comprises as essential elements a spacer sleeve 32 with a washer 34 formed on the head side, a plate spring 36 which forms a closed spring chamber 37 which is protected from dirt, so that no blocking by dirt residues can occur, a washer 38 and a screw 40. The heads the parts 32 and 40 are housed together in the depression of a recess (counterbore) 42 of a trim part 44 made of plastic or hardwood. The spacer sleeve 32 rests with its foot on the surface 20 of the claw 22. The end of the foot can be adapted to the surface shape. The plate spring 36 and the washer 38 are located between the surface 20 and the side of the cladding part 44 facing this surface 20. They are both pushed onto the foot of the spacer sleeve 32. The edge of the plate spring 36 lies on the surface 20. The washer 38 protects the trim part 44 from excessive stress. Instead of the plate spring 36, another spring can also be used Underlay, such as a coil spring, can be used. The trim part 44 is rounded to the outside. The foot of the screw 40 inserted through the spacer sleeve 32 is screwed into the claw 22 and secured in this claw 22, for example by welding spot, nut or adhesive securing.

Eine Hülse, die der Hülse 32 entspricht, kann bevorzugt auch bei der Ausführungsform nach Fig. 2 anstelle der Unterlegscheibe 26 vorgesehen sein.A sleeve that corresponds to the sleeve 32 can preferably also be provided in the embodiment according to FIG. 2 instead of the washer 26.

Es soll betont werden, daß ― in Abweichung von Fig. 3 ― das Verkleidungsteil 44 mit einer Vielzahl von Federeinrichtungen 34, 36, 38, 40 versehen ist, die dessen federnde Wirkung bestimmen. Diese Federeinrichtungen können in einer Reihe nebeneinander angeordnet sein.It should be emphasized that - in deviation from Fig. 3 - the trim part 44 is provided with a plurality of spring devices 34, 36, 38, 40 which determine its resilient effect. These spring devices can be arranged side by side in a row.

Schlägt die Kralle 22 mit der aufgesetzten Verkleidung 30 gegen eine Betonwand an, so verschiebt sich das Verkleidungsteil 44 samt Unterlegscheibe 38 gegen die Kraft der Tellerfeder 36 entlang der Abstandshülse 32 in Richtung auf die Oberfläche 20. Die Schlagenergie wird von den verschiedenen Federeinrichtungen 34 bis 40, aber auch durch die Oberflächenverformung des Verkleidungsteiles 44 aufgefangen.If the claw 22 strikes against a concrete wall with the covering 30 attached, the covering part 44 together with the washer 38 moves against the force of the plate spring 36 along the spacer sleeve 32 in the direction of the surface 20. The impact energy is generated by the various spring devices 34 to 40 , but also caught by the surface deformation of the trim part 44.

Claims (10)

1. A gripping device for a hoist, in particular for use in a waste treatment plant, characterised in that the hoist is provided with a resilient protective device (10) in the region of its outwardly situated contact faces (e.g. 20).
2. A gripping device according to claim 1, characterised in that the protective device (10) comprises a number of pads (12, 14).
3. A gripping device according to claim 1 or 2, characterised in that the protective device (10) is resilient inside and is comparatively hard outside.
4. A gripping device according to one of claims 1 to 3, characterised in that the protective device (10) comprises a multi-layer rubber covering (16, 18).
5. A gripping device according to claim 3 or 4, characterised in that the multi-layer rubber covering (16, 18) has inside a layer (16) of soft rubber and outside a layer (18) of hard rubber.
6. A gripping device according to claim 4 or 5, characterised in that the protective device (10) is screwed, pasted, or vulcanised onto the outwardly situated contact face (20).
7. A gripping device according to one of claims 1 to 3, characterised in that the protective device (10) comprises a flexible covering (30).
8. A gripping device according to claim 7, characterised in that the flexible covering (30) has a cup spring (36), a spacer sleeve (34) lying on the contact face (20) and extending through said spring, and an outer covering part (44).
9. A gripping device according to claim 7 or 8, characterised in that the covering (30) comprises a hard wooden or plastic part (44), which is secured in a flexible manner to the contact face (20).
10. A gripping device according to one of claims 1 to 9, characterised in that the protective device (10) is outwardly rounded-off.
EP89105972A 1988-04-18 1989-04-05 Grab for a hoist Expired - Lifetime EP0338323B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89105972T ATE70028T1 (en) 1988-04-18 1989-04-05 GRIPPER FOR A HOIST.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812859A DE3812859A1 (en) 1988-04-18 1988-04-18 GRIPPER FOR A HOIST
DE3812859 1988-04-18

Publications (2)

Publication Number Publication Date
EP0338323A1 EP0338323A1 (en) 1989-10-25
EP0338323B1 true EP0338323B1 (en) 1991-12-04

Family

ID=6352226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105972A Expired - Lifetime EP0338323B1 (en) 1988-04-18 1989-04-05 Grab for a hoist

Country Status (5)

Country Link
EP (1) EP0338323B1 (en)
AT (1) ATE70028T1 (en)
DE (3) DE8816565U1 (en)
ES (1) ES2028401T3 (en)
GR (1) GR3003850T3 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1756642C3 (en) * 1968-06-20 1973-09-20 Demag Ag, 4100 Duisburg Gripper in composite construction

Also Published As

Publication number Publication date
DE3812859A1 (en) 1989-10-26
ES2028401T3 (en) 1992-07-01
DE8816565U1 (en) 1989-11-16
EP0338323A1 (en) 1989-10-25
ATE70028T1 (en) 1991-12-15
GR3003850T3 (en) 1993-03-16
DE58900520D1 (en) 1992-01-16

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