EP3192765A1 - Load clamp for engagement in a hole in the load - Google Patents

Load clamp for engagement in a hole in the load Download PDF

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Publication number
EP3192765A1
EP3192765A1 EP17000045.9A EP17000045A EP3192765A1 EP 3192765 A1 EP3192765 A1 EP 3192765A1 EP 17000045 A EP17000045 A EP 17000045A EP 3192765 A1 EP3192765 A1 EP 3192765A1
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EP
European Patent Office
Prior art keywords
load
spherical
expansion cone
bore
connecting rod
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Granted
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EP17000045.9A
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German (de)
French (fr)
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EP3192765B1 (en
Inventor
Benedikt KAISER-MÜHLECKER
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Sihga GmbH
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Sihga GmbH
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Priority to PL17000045T priority Critical patent/PL3192765T3/en
Publication of EP3192765A1 publication Critical patent/EP3192765A1/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
    • B66C1/62—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 comprising article-engaging members of a shape complementary to that of the articles to be handled
    • B66C1/66—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 comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
    • 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
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
    • B66C1/54—Internally-expanding grippers for handling hollow articles

Definitions

  • the invention relates to a load gripper for engagement with a bore in the load.
  • the load gripper has a central, frusto-conical expansion cone and a plurality of so-called expanding wedges, which are arranged around the circumference of the Sp Drkegels next to each other.
  • the radially outer surfaces of the expanding wedges are formed as toothed partial surfaces of a circular cylinder jacket surface.
  • the load gripper with the expansion cone and the expanding wedges is inserted into a hole in the load.
  • the expansion cone is pulled slightly in the direction of the bore opening, the expansion wedges, however, are supported, also to be moved to the opening of the hole.
  • the resulting relative movement between expansion cone and expanding wedges causes the expanding wedges are pressed radially outwardly with respect to the bore axis, to the lateral surface of the bore, and jam with this.
  • a crane can attack the eyelet and lift the load gripper together with the load.
  • the load To release the load gripper from the load, the load must rest on a base. By pressure or impact on the eyelet the expansion cone is moved into the hole in the load. The expanding wedges thus gain mobility radially inward in the bore. They thus solve the spread on the lateral surface of the bore. The load gripper can be pulled out of the hole again.
  • connection between the frusto-conical expansion cone and the connecting rod is rigid.
  • the connection between the connecting rod and the load receiving eye is designed as a stop surface between a part ball outer surface and the inside of a part ball shell surface, so that the load receiving eye relative to the connecting rod is pivotable about two axes under load (overcoming friction).
  • a bending moment is introduced into the connecting rod and the expansion cone is opposite the expansion wedges is rotated about an axis which is aligned normal to the axis of the expansion cone. Both the bending moment as well as by the said twisting leads to damage to connecting rod, expansion cone, expanding wedges and load. These damages reduce the reliability, service life and permissible load of the load gripper.
  • the object underlying the invention is to improve the well-known from the prior art load gripper for engaging a hole in the load so that no damage occurs even if at the eyelet laterally, so normal to the orientation of the Hole is pulled in the load. (This is particularly important when a plurality of such load grippers engage at a distance from one another, the individual load grippers are connected to a cable or a chain, and a crane acts on this traction means at a distance from the individual load grippers.)
  • connection between the connecting rod and load eye is a stop surface between a partial spherical outer surface and the inside of a part spherical shell surface, but also the connection between the connecting rod and expansion cone.
  • the exemplary load gripper 1 of Fig. 1 has a plurality of so-called expanding wedges 3, which are arranged lined up around a central circular symmetrical expansion cone 4 around. With respect to the axis 5 of the expansion cone 4 radially outer lateral surfaces of the expanding wedges 3 are partial annular surfaces about the axis 5 of the expanding cone 4. These surfaces are in use befindlichem load gripper 1 on the lateral surfaces of that bore 6, in which intended the load gripper 1 with the Sp Drkegel 4 is inserted ahead until it rests with an end face of the annular support member 7 on the load 2.
  • the expansion cone 4 is connected to the load receiving eye 8, at the through hole of a rope, a shackle or a crane hook can attack, tensile strength connected. About this tensile connection external forces are optionally applied to the Lastabilityeria 8 forwarded by the Lastrealey 8 to the expansion cone 4, so that so the Lastabilityeria 8 can not be moved away from the Sp Drkegel 4.
  • the expanding cone 4 passes the force on the contact surfaces with the expanding wedges 3 to the expanding wedges 3.
  • the expanding wedges 3 forward the force to the lateral surface of the bore 6 in the load 2 on.
  • the tensile anchoring of the connecting rod 9 is carried out at both ends of the connecting rod 9 so that in each case one rigidly connected to the connecting rod 9 part spherical outer surface 10, 11 rests against a partial spherical shell surface with the same spherical radius.
  • connection between the connecting rod 9 and the parts connected to it is pivotable about three axes. It is thus achieved that regardless of the direction in which the load receiving eye 8 draws an external force, no bending moments are introduced into the connecting rod 9. Furthermore, it is achievable that, regardless of the direction of the force on the load receiving eye 8, the pairs of body surfaces at which by pressure forces between the components connecting rod 9 and expanding cone 4 and 4 expansion wedges and expanding wedges 3 and connecting rod 9 and lifting ring 12 are transmitted always full abut each other so that it can not come to selectively destructive high surface pressures.
  • the load gripper 1 shown has an annular support member 7 which is aligned coaxially to the axis 5 of the expansion cone 4, rests with mounted load gripper 1 with an end face on the edge of the bore 6 on the surface of the load 2, and with an annular collar 13 something in the Bore 6 protrudes and abuts the outer edge region of the lateral surface of the bore 6. Since the support part 7 includes the lifting ring 12 connected to the load receiving eye 8, it limits the movement of the lifting ring 12 can be moved radially to the axis 5, when strong forces radially aligned with the axis 5 engage the load receiving eye. The support member 7 directs these forces over the collar 13 over a large area - and thus without destructive surface pressures - on the lateral surface of the bore. 6
  • connecting rod 9 For reasons of manufacturability and mountability, it is advisable not monolithic form the connecting rod 9 with two part-spherical end portions 10, 11, but releasably connect them to one of these end portions, typically via a secure screw connection.
  • Fig. 1 shown it is advantageous - as in Fig. 1 shown - not form the load-receiving eyelet 8 monolithic together with the lifting ring 12, which rests with a teilkugelschaligen surface at the upper part-spherical end portion of the connecting rod 9.
  • these two parts can be releasably connected to each other, for example, as shown by means of a mounting plate 14, and screws 15 which hold a widened annular lower edge region of the load receiving eye 8 in a circular cylindrical recess of the lifting ring 12.
  • this depression is deeper than the thickness of said edge region of the load-receiving eyelet 8, so that the load-receiving eyelet 8 relative to the lifting ring 12 in the assembled state still about the axis 5 is rotatable.

Abstract

Die Erfindung betrifft einen Lastgreifer (1) für den Eingriff an einer Bohrung (6) in einer Last (2) wobei um einen Spreizkegel (4) herum mehrere Spreizkeile (3) angeordnet sind, welche durch axiale Relativverschiebung des Spreizkegels (4) bezüglich der Achse (5) des Spreizkegels (4) radial nach außen verschiebbar sind und dadurch mit der Mantelfläche der Bohrung (6) verklemmbar sind, wobei der Spreizkegel (4) über eine Verbindungsstange (9) mit einer Lastaufnahmeöse (8) zugfest verbunden ist. Beide Endbereiche (10, 11) der Verbindungsstange (9) sind teilkugelförmig ausgebildet und liegen an teilkugelschalenförmigen Oberflächen mit gleichem Kugelradius an jenem Teil an, an welchen sie im Lastfall Kraft übertragen.The invention relates to a load gripper (1) for engagement with a bore (6) in a load (2) around a spreading cone (4) around several expansion wedges (3) are arranged, which by axial relative displacement of the expansion cone (4) with respect Axis (5) of the expansion cone (4) are displaceable radially outward and thereby can be clamped with the lateral surface of the bore (6), wherein the expansion cone (4) via a connecting rod (9) with a Lastaufnahmeöse (8) is connected tensile strength. Both end portions (10, 11) of the connecting rod (9) are formed in a part-spherical shape and abut against part spherical shell-shaped surfaces with the same spherical radius on that part to which they transmit force in the load case.

Description

Die Erfindung betrifft einen Lastgreifer für den Eingriff an einer Bohrung in der Last.The invention relates to a load gripper for engagement with a bore in the load.

Durch die US 1048585 A wird schon 1912 ein gattungsgemäßer Lastgreifer für den Eingriff an einer Bohrung in der Last gezeigt. Der Lastgreifer weist einen mittleren, kegelstumpfförmigen Spreizkegel und mehrere sogenannte Spreizkeile auf, welche um den Umfang des Spreizkegels herum nebeneinander angeordnet sind. Die radial außen liegenden Flächen der Spreizkeile sind als verzahnte Teilflächen einer Kreiszylindermantelfläche ausgebildet. Wenn der Spreizkegel parallel zu seiner Achse relativ zu den Spreizkeilen in jener Richtung verschoben wird bei der seine kleiner Stirnfläche vorne liegt, werden die Spreizkeile durch die Mantelfläche des Spreizkegels radial von der Achse des Spreizkegels weg gedrückt. Der Spreizkegel ist über eine Verbindungsstange, welche von der kleineren Stirnfläche des Spreizkegels weg verläuft, mit einer Lastaufnahmeöse, also einem metallischen Teil, welcher ein Durchgangsloch für den Durchgriff eines Seiles, Schäkels, oder Lasthakens aufweist, verbunden.By the US 1048585 A As early as 1912, a generic load gripper for engaging a hole in the load is shown. The load gripper has a central, frusto-conical expansion cone and a plurality of so-called expanding wedges, which are arranged around the circumference of the Spreizkegels next to each other. The radially outer surfaces of the expanding wedges are formed as toothed partial surfaces of a circular cylinder jacket surface. When the expanding cone is displaced parallel to its axis relative to the expanding wedges in the direction in which its small face is forward, the expanding wedges are pressed by the lateral surface of the expansion cone radially away from the axis of the expansion cone. The expansion cone is connected via a connecting rod which extends away from the smaller end face of the expansion cone, with a Lastaufnahmeöse, ie a metallic part, which has a through hole for the passage of a rope, shackle, or load hook connected.

Für das Verankern einer Last wird der Lastgreifer mit dem Spreizkegel und den Spreizkeilen voran in eine Bohrung in der Last hineingesteckt. Mit Hilfe eines Hebels und einer Öse wird dann der Spreizkegel etwas in Richtung der Bohrungsöffnung gezogen, wobei die Spreizkeile dagegen abgestützt werden, ebenfalls zur Öffnung der Bohrung hin verschoben zu werden. Die damit erfolgende Relativbewegung zwischen Spreizkegel und Spreizkeilen bewirkt, dass die Spreizkeile bezüglich der Bohrungsachse radial nach außen, an die Mantelfläche der Bohrung gedrückt werden, und sich mit dieser verklemmen. Nun kann an der Öse beispielsweise ein Kran angreifen und den Lastgreifer samt Last anheben.For anchoring a load, the load gripper with the expansion cone and the expanding wedges is inserted into a hole in the load. With the help of a lever and an eyelet then the expansion cone is pulled slightly in the direction of the bore opening, the expansion wedges, however, are supported, also to be moved to the opening of the hole. The resulting relative movement between expansion cone and expanding wedges causes the expanding wedges are pressed radially outwardly with respect to the bore axis, to the lateral surface of the bore, and jam with this. For example, a crane can attack the eyelet and lift the load gripper together with the load.

Für das Lösen des Lastgreifers von der Last muss die Last an einem Untergrund aufliegen. Durch Druck oder Schlag auf die Öse wird der Spreizkegel in die Bohrung in der Last hinein verschoben. Die Spreizkeile gewinnen damit Beweglichkeit radial nach innen in der Bohrung. Sie lösen damit die Verspreizung an der Mantelfläche der Bohrung. Der Lastgreifer kann wieder aus der Bohrung herausgezogen werden.To release the load gripper from the load, the load must rest on a base. By pressure or impact on the eyelet the expansion cone is moved into the hole in the load. The expanding wedges thus gain mobility radially inward in the bore. They thus solve the spread on the lateral surface of the bore. The load gripper can be pulled out of the hole again.

Die Verbindung zwischen dem kegelstumpfförmigen Spreizkegel und der Verbindungsstange ist starr. Die Verbindung zwischen der Verbindungsstange und der Lastaufnahmeöse ist als Anschlagsfläche zwischen einer Teilkugel-Außenfläche und der Innenseite einer Teilkugel-Schalenfläche ausgeführt, sodass die Lastaufnahmeöse gegenüber der Verbindungsstange auch unter Last um zwei Achsen schwenkbar ist (unter Überwindung von Reibung). Trotz dieser Schwenkbarkeit tritt das Problem auf, dass dann, wenn an der Öse eine Kraft angreift, welche nicht parallel zur Richtung der Verbindungsstange (und damit parallel zu Bohrung in der Last) ausgerichtet ist, ein Biegemoment in die Verbindungsstange eingeleitet wird und der Spreizkegel gegenüber den Spreizkeilen um eine Achse verdreht wird, die normal zur Achse des Spreizkegels ausgerichtet ist. Sowohl durch das Biegemoment als auch durch die besagte Verdrehung kommt es zu Schäden an Verbindungsstange, Spreizkegel, Spreizkeilen und Last. Durch diese Schäden werden Zuverlässigkeit, Lebensdauer und zulässige Traglast des Lastgreifers vermindert.The connection between the frusto-conical expansion cone and the connecting rod is rigid. The connection between the connecting rod and the load receiving eye is designed as a stop surface between a part ball outer surface and the inside of a part ball shell surface, so that the load receiving eye relative to the connecting rod is pivotable about two axes under load (overcoming friction). Despite this pivoting, the problem arises that when a force is applied to the eyelet which is not aligned parallel to the direction of the connecting rod (and thus parallel to the bore in the load), a bending moment is introduced into the connecting rod and the expansion cone is opposite the expansion wedges is rotated about an axis which is aligned normal to the axis of the expansion cone. Both the bending moment as well as by the said twisting leads to damage to connecting rod, expansion cone, expanding wedges and load. These damages reduce the reliability, service life and permissible load of the load gripper.

Die der Erfindung zu Grunde liegende Aufgabe besteht darin, den aus dem Stand der Technik bekannten Lastgreifer für den Eingriff an einer Bohrung in der Last so zu verbessern, dass auch dann keinerlei Beschädigungen auftreten, wenn an der Öse stark seitlich, also normal zur Ausrichtung der Bohrung in der Last gezogen wird. (Das ist insbesondere dann wichtig, wenn an einer Last mehrere derartige Lastgreifer in einem Abstand zueinander angreifen, die einzelnen Lastreifer mit einem Seil oder einer Kette verbunden sind, und ein Kran an diesem Zugmittel in einem Abstand von den einzelnen Lastgreifern angreift.)The object underlying the invention is to improve the well-known from the prior art load gripper for engaging a hole in the load so that no damage occurs even if at the eyelet laterally, so normal to the orientation of the Hole is pulled in the load. (This is particularly important when a plurality of such load grippers engage at a distance from one another, the individual load grippers are connected to a cable or a chain, and a crane acts on this traction means at a distance from the individual load grippers.)

Zum Lösen der Aufgabe wird vorgeschlagen, nicht nur die Verbindung zwischen Verbindungsstange und Lastöse als Anschlagsfläche zwischen einer Teilkugel-Außenfläche und der Innenseite einer Teilkugel-Schalenfläche auszubilden, sondern auch die Verbindung zwischen Verbindungsstange und Spreizkegel.To solve the problem, it is proposed not only to form the connection between the connecting rod and load eye as a stop surface between a partial spherical outer surface and the inside of a part spherical shell surface, but also the connection between the connecting rod and expansion cone.

Gemäß einer bevorzugten Weiterentwicklung weist der Lastgreifer einen Abstützungsteil auf, welcher bestimmungsgemäß an der Mantelfläche der Bohrung in der Last anliegt und einen Anschlag gegen Bewegung des Verbindungsbereiches zwischen Verbindungsstange und Lastöse in Radialrichtung der Bohrung bildet.

Fig. 1:
zeigt einen beispielhafte erfindungsgemäßen Lastgreifer 1 in seitlicher Teilschnittansicht an einer Last 2.
According to a preferred refinement, the load gripper has a support part which, as intended, bears against the lateral surface of the bore in the load and forms a stop against movement of the connection region between connecting rod and load eye in the radial direction of the bore.
Fig. 1:
shows an exemplary load gripper 1 according to the invention in a side partial sectional view of a load 2.

Der beispielhafte erfindungsgemäße Lastgreifer 1 von Fig. 1 weist mehrere sogenannte Spreizkeile 3 auf, welche um einen mittleren kreissymmetrischen Spreizkegel 4 herum aneinandergereiht angeordnet sind. Die bezüglich der Achse 5 des Spreizkegels 4 radial außen liegenden Mantelflächen der Spreizkeile 3 sind Teilringflächen um die Achse 5 des Spreizkegels 4. Diese Flächen liegen bei im Einsatz befindlichem Lastgreifer 1 an den Mantelflächen jener Bohrung 6 an, in welche bestimmungsgemäß der Lastgreifer 1 mit dem Spreizkegel 4 voran eingesteckt wird, bis er mit einer Stirnfläche des ringförmigen Abstützungsteiles 7 an der Last 2 aufliegt.The exemplary load gripper 1 of Fig. 1 has a plurality of so-called expanding wedges 3, which are arranged lined up around a central circular symmetrical expansion cone 4 around. With respect to the axis 5 of the expansion cone 4 radially outer lateral surfaces of the expanding wedges 3 are partial annular surfaces about the axis 5 of the expanding cone 4. These surfaces are in use befindlichem load gripper 1 on the lateral surfaces of that bore 6, in which intended the load gripper 1 with the Spreizkegel 4 is inserted ahead until it rests with an end face of the annular support member 7 on the load 2.

Spreizkegel 4 und Spreizkeile 3 liegen jeweils an Teil-Kegelmantelflächen aneinander an, wobei die Achse des (gedachten) Kegels die Achse 5 des Spreizkegels 4 ist und die Basis des Kegels näher am Grund der Bohrung 6 in der Last 2 liegt als die Spitze des Kegels. Damit bewirkt Relativbewegung des Spreizkegels 4 gegenüber den Spreizkeilen 3 zur Öffnung der Bohrung 6 in der Last 2 hin, dass die Spreizkeile 3 von der Achse 5 des Spreizkegels 4 radial weg gedrückt werden, und somit mit der Wand der Bohrung 6 verklemmen.Spreader 4 and expanding wedges 3 abut each other on part-conical surfaces, wherein the axis of the (imaginary) cone is the axis 5 of the expanding cone 4 and the base of the cone is closer to the bottom of the bore 6 in the load 2 as the tip of the cone , This causes relative movement of the expansion cone 4 relative to the expanding wedges 3 for opening the bore 6 in the load 2 out that the expanding wedges 3 of the axis 5 of the expansion cone 4 are pressed radially away, and thus jam with the wall of the bore 6.

Der Spreizkegel 4 ist mit der Lastaufnahmeöse 8, an deren Durchgangsbohrung ein Seil, ein Schäkel oder auch ein Kranhaken angreifen kann, zugfest verbunden. Über diese zugfeste Verbindung werden äußere Kräfte die gegebenenfalls an der Lastaufnahmeöse 8 angreifen, von der Lastaufnahmeöse 8 an den Spreizkegel 4 weitergeleitet, sodass also die Lastaufnahmeöse 8 nicht vom Spreizkegel 4 weg bewegt werden kann. Der Spreizkegel 4 leitet die Kraft über die Berührungsflächen mit den Spreizkeilen 3 an die Spreizkeile 3. Die Spreizkeile 3 leiten die Kraft an die Mantelfläche der Bohrung 6 in der Last 2 weiter.The expansion cone 4 is connected to the load receiving eye 8, at the through hole of a rope, a shackle or a crane hook can attack, tensile strength connected. About this tensile connection external forces are optionally applied to the Lastaufnahmeöse 8 forwarded by the Lastaufnahmeöse 8 to the expansion cone 4, so that so the Lastaufnahmeöse 8 can not be moved away from the Spreizkegel 4. The expanding cone 4 passes the force on the contact surfaces with the expanding wedges 3 to the expanding wedges 3. The expanding wedges 3 forward the force to the lateral surface of the bore 6 in the load 2 on.

Die zugfeste Verbindung zwischen Lastaufnahmeöse 8 und Spreizkegel 4 erstreckt sich natürlich über den Abstand zwischen diesen beiden Teilen, wobei der größte Teil dieses Abstandes durch eine Verbindungsstange 9 überbrückt wird, welche gegebenenfalls in ihrer Längsrichtung Zugkraft zwischen Lastaufnahmeöse 8 und Spreizkegel 4 überträgt.The tension-resistant connection between Lastaufnahmeöse 8 and 4 Spreizkegel naturally extends over the distance between these two parts, wherein the largest part of this distance is bridged by a connecting rod 9, which optionally transmits in its longitudinal direction tensile force between Lastaufnahmeöse 8 and 4 Spreizkegel.

Erfindungsgemäß ist die zugfeste Verankerung der Verbindungsstange 9 an beiden Enden der Verbindungsstange 9 so ausgeführt, dass jeweils eine mit der Verbindungsstange 9 starr verbundene Teilkugel-Außenfläche 10, 11 an einer Teilkugel-Schalenfläche mit gleichem Kugelradius anliegt.According to the invention, the tensile anchoring of the connecting rod 9 is carried out at both ends of the connecting rod 9 so that in each case one rigidly connected to the connecting rod 9 part spherical outer surface 10, 11 rests against a partial spherical shell surface with the same spherical radius.

Damit ist die Verbindung zwischen der Verbindungsstange 9 und den mit ihr verbundenen Teilen um drei Achsen schwenkbar. Es wird damit erreicht, dass unabhängig davon in welche Richtung an der Lastaufnahmeöse 8 eine äußere Kraft zieht, keinerlei Biegemomente in die Verbindungsstange 9 eingeleitet werden. Weiters ist damit erreichbar, dass unabhängig von der Richtung der Kraft an der Lastaufnahmeöse 8, die Paare von Körperoberflächen an denen durch Druck Kräfte zwischen den Bauteilen Verbindungsstange 9 und Spreizkegel 4 sowie Spreizkegel 4 und Spreizkeilen 3 sowie Verbindungsstange 9 und Hebering 12, übertragen werden, immer satt aneinander anliegen, sodass es nicht zu punktuell zerstörerisch hohen Flächenpressungen kommen kann.Thus, the connection between the connecting rod 9 and the parts connected to it is pivotable about three axes. It is thus achieved that regardless of the direction in which the load receiving eye 8 draws an external force, no bending moments are introduced into the connecting rod 9. Furthermore, it is achievable that, regardless of the direction of the force on the load receiving eye 8, the pairs of body surfaces at which by pressure forces between the components connecting rod 9 and expanding cone 4 and 4 expansion wedges and expanding wedges 3 and connecting rod 9 and lifting ring 12 are transmitted always full abut each other so that it can not come to selectively destructive high surface pressures.

Der gezeigte Lastgreifer 1 weist einen ringförmigen Abstützungsteil 7 auf, welcher koaxial zur Achse 5 des Spreizkegels 4 ausgerichtet, bei montiertem Lastgreifer 1 mit einer Stirnfläche am Rand der Bohrung 6 auf der Oberfläche der Last 2 aufliegt, und mit einem ringförmigen Kragen 13 etwas in die Bohrung 6 hineinragt und am äußeren Randbereich der Mantelfläche der Bohrung 6 anliegt. Da der Abstützungsteil 7 den mit der Lastaufnahmeöse 8 verbundenen Hebering 12 umfasst, begrenzt er die Bewegung die der Hebering 12 radial zur Achse 5 verschoben werden kann, wenn an der Lastaufnahmeöse starke radial zur Achse 5 ausgerichtete Kräfte angreifen. Der Abstützungsteil 7 leitet diese Kräfte über den Kragen 13 großflächig - und damit ohne zerstörerische Flächenpressungen - an die Mantelfläche der Bohrung 6.The load gripper 1 shown has an annular support member 7 which is aligned coaxially to the axis 5 of the expansion cone 4, rests with mounted load gripper 1 with an end face on the edge of the bore 6 on the surface of the load 2, and with an annular collar 13 something in the Bore 6 protrudes and abuts the outer edge region of the lateral surface of the bore 6. Since the support part 7 includes the lifting ring 12 connected to the load receiving eye 8, it limits the movement of the lifting ring 12 can be moved radially to the axis 5, when strong forces radially aligned with the axis 5 engage the load receiving eye. The support member 7 directs these forces over the collar 13 over a large area - and thus without destructive surface pressures - on the lateral surface of the bore. 6

Aus Gründen der Herstellbarkeit und Montierbarkeit ist es ratsam die Verbindungsstange 9 nicht monolithisch mit beiden teilkugelförmigen Endbereichen 10, 11 auszubilden, sondern sie mit einem dieser Endbereiche lösbar, typischerweise über eine gesicherte Schraubverbindung, zu verbinden.For reasons of manufacturability and mountability, it is advisable not monolithic form the connecting rod 9 with two part-spherical end portions 10, 11, but releasably connect them to one of these end portions, typically via a secure screw connection.

Aus Gründen der guten Montierbarkeit und der einfachen Handhabbarkeit ist es vorteilhaft - wie in Fig. 1 gezeigt - die Lastaufnahmeöse 8 nicht monolithisch gemeinsam mit dem Hebering 12 auszubilden, welcher mit einer teilkugelschaligen Fläche am oberen teilkugelförmigen Endbereich der Verbindungsstange 9 anliegt. Stattdessen können diese beiden Teile lösbar miteinander verbunden sein, beispielsweise wie gezeigt mittels einer Befestigungsscheibe 14, und Schrauben 15, welche einen verbreiterten ringförmigen unteren Randbereich der Lastaufnahmeöse 8 in einer kreiszylinderförmigen Vertiefung des Heberinges 12 halten. Vorteilhafterweise ist diese Vertiefung tiefer als die Stärke des besagten Randbereiches der Lastaufnahmeöse 8, sodass die Lastaufnahmeöse 8 gegenüber dem Hebering 12 auch in montiertem Zustand noch um die Achse 5 verdrehbar ist.For reasons of good mountability and ease of use, it is advantageous - as in Fig. 1 shown - not form the load-receiving eyelet 8 monolithic together with the lifting ring 12, which rests with a teilkugelschaligen surface at the upper part-spherical end portion of the connecting rod 9. Instead, these two parts can be releasably connected to each other, for example, as shown by means of a mounting plate 14, and screws 15 which hold a widened annular lower edge region of the load receiving eye 8 in a circular cylindrical recess of the lifting ring 12. Advantageously, this depression is deeper than the thickness of said edge region of the load-receiving eyelet 8, so that the load-receiving eyelet 8 relative to the lifting ring 12 in the assembled state still about the axis 5 is rotatable.

Claims (2)

Lastgreifer (1) für den Eingriff an einer Bohrung (6) in einer Last (2) wobei um einen Spreizkegel (4) herum mehrere Spreizkeile (3) angeordnet sind, welche durch axiale Relativverschiebung des Spreizkegels (4) bezüglich der Achse (5) des Spreizkegels (4) radial nach außen verschiebbar sind und dadurch mit der Mantelfläche der Bohrung (6) verklemmbar sind, wobei der Spreizkegel (4) über eine Verbindungsstange (9) mit einer Lastaufnahmeöse (8) zugfest verbunden ist, wobei der der Lastaufnahmeöse (8) zugewandte Endbereich (10) der Verbindungsstange (9) teilkugelförmig ausgebildet ist und nur dieser teilkugelförmige Endbereich (10) mit seiner teilkugelförmigen Außenfläche mit der Lastaufnahmeöse (8) bzw. einem mit dieser kraftübertragend verbundenen Teil (12) in Kontakt ist, wobei der teilkugelförmige Endbereich (10) an der Innenseite einer teilkugelschalenförmigen Oberfläche mit gleichem Kugelradius der Lastaufnahmeöse (8) bzw. eines damit kraftübertragend verbundenen Teiles (12) anliegt,
dadurch gekennzeichnet, dass
auch der dem Spreizkegel (4) zugewandte Endbereich (11) der Verbindungsstange (9) teilkugelförmig ausgebildet ist und nur dieser teilkugelförmigen Endbereich (11) mit seiner teilkugelförmigen Außenfläche mit dem Spreizkegel (4) bzw. einem mit diesem kraftübertragend verbundenen Teil in Kontakt ist, wobei der teilkugelförmige Endbereich (11) an der Innenseite einer teilkugelschalenförmigen Oberfläche mit gleichem Kugelradius des Spreizkegels (4) bzw. eines damit kraftübertragend verbundenen Teiles anliegt.Load gripper (1) for engagement with a bore (6) in a load (2) around which a spreading cone (4) around several expanding wedges (3) are arranged, which by axial relative displacement of the expansion cone (4) with respect to the axis (5) of the expansion cone (4) are displaceable radially outward and thereby can be clamped with the lateral surface of the bore (6), wherein the expansion cone (4) via a connecting rod (9) with a Lastaufnahmeöse (8) is connected tensile strength, wherein the load receiving eye ( 8) facing end portion (10) of the connecting rod (9) is formed partially spherical and only this part spherical end portion (10) with its part spherical outer surface with the load receiving eye (8) or a force transmitting connected to this part (12) in contact, wherein the part-spherical end portion (10) on the inside of a part spherical shell-shaped surface with the same spherical radius of the load receiving eye (8) or a force transmitting connected Part (12) is present,
characterized in that
also the expansion cone (4) facing end portion (11) of the connecting rod (9) is formed partially spherical and only this part spherical end portion (11) with its part-spherical outer surface with the expansion cone (4) or a force-transmitting connected to this part in contact, wherein the part-spherical end portion (11) bears against the inside of a part-spherical shell-shaped surface with the same spherical radius of the expansion cone (4) or a part connected thereto in a force-transmitting manner. Lastgreifer nach Anspruch 1, dadurch gekennzeichnet, dass er einen ringförmigen Abstützungsteil (7) aufweist, welcher bei an der Last (2) montiertem Lastgreifer (1) mit einer Stirnfläche am Rand der Bohrung (6) auf die Oberfläche der Last (2) auflegbar ist und dabei mit einem ringförmigen Kragen (13) in die Bohrung (6) hineinragt und an der Mantelfläche der Bohrung (6) anliegt.Load gripper according to claim 1, characterized in that it comprises an annular support part (7) which, when mounted on the load (2) load gripper (1) having an end face at the edge of the bore (6) on the surface of the load (2) can be placed and thereby projects with an annular collar (13) in the bore (6) and abuts the lateral surface of the bore (6).
EP17000045.9A 2016-01-11 2017-01-11 Load clamp for engagement in a hole in the load Active EP3192765B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17000045T PL3192765T3 (en) 2016-01-11 2017-01-11 Load clamp for engagement in a hole in the load

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA5/2016A AT518242B1 (en) 2016-01-11 2016-01-11 Load gripper for engaging a hole in the load

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EP3192765A1 true EP3192765A1 (en) 2017-07-19
EP3192765B1 EP3192765B1 (en) 2018-08-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018100355A1 (en) * 2018-01-09 2019-07-11 Josef Pfanzelt Coupling device for connecting a lifting means with a load
AT524016B1 (en) * 2020-11-02 2022-02-15 Sihga GmbH Load gripper for engaging a hole in the load

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048585A (en) * 1910-09-26 1912-12-31 Sears Roebuck & Co Gripping device.
US3201166A (en) * 1963-02-04 1965-08-17 Gencarelli Inc Device for lifting heavy articles
FR2297964A1 (en) * 1975-01-14 1976-08-13 Bentley Charles PERFECTED FLOORING AND ASSEMBLY FOR BUILDINGS
WO2010045692A1 (en) * 2008-10-23 2010-04-29 Obelix Holdings Pty Limited A lifting device and method for concrete elements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1048585A (en) * 1910-09-26 1912-12-31 Sears Roebuck & Co Gripping device.
US3201166A (en) * 1963-02-04 1965-08-17 Gencarelli Inc Device for lifting heavy articles
FR2297964A1 (en) * 1975-01-14 1976-08-13 Bentley Charles PERFECTED FLOORING AND ASSEMBLY FOR BUILDINGS
WO2010045692A1 (en) * 2008-10-23 2010-04-29 Obelix Holdings Pty Limited A lifting device and method for concrete elements

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018100355A1 (en) * 2018-01-09 2019-07-11 Josef Pfanzelt Coupling device for connecting a lifting means with a load
DE102018100355B4 (en) * 2018-01-09 2021-02-25 Josef Pfanzelt Coupling device for connecting a lifting device to a load
AT524016B1 (en) * 2020-11-02 2022-02-15 Sihga GmbH Load gripper for engaging a hole in the load
AT524016A4 (en) * 2020-11-02 2022-02-15 Sihga GmbH Load gripper for engaging a hole in the load
EP3992136A1 (en) * 2020-11-02 2022-05-04 SIHGA GmbH Load clamp for use on a drilled hole in the load

Also Published As

Publication number Publication date
AT518242A1 (en) 2017-08-15
PL3192765T3 (en) 2019-01-31
EP3192765B1 (en) 2018-08-22
AT518242B1 (en) 2018-03-15

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