EP0499208B1 - Telescopic jib for mobile cranes or the like - Google Patents

Telescopic jib for mobile cranes or the like Download PDF

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Publication number
EP0499208B1
EP0499208B1 EP92102268A EP92102268A EP0499208B1 EP 0499208 B1 EP0499208 B1 EP 0499208B1 EP 92102268 A EP92102268 A EP 92102268A EP 92102268 A EP92102268 A EP 92102268A EP 0499208 B1 EP0499208 B1 EP 0499208B1
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EP
European Patent Office
Prior art keywords
telescopic jib
sections
profile
telescopic
section
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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
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EP92102268A
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German (de)
French (fr)
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EP0499208B2 (en
EP0499208A3 (en
EP0499208A2 (en
Inventor
Rudolf Becker
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Liebherr Werk Ehingen GmbH
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Liebherr Werk Ehingen GmbH
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Priority claimed from DE9102552U external-priority patent/DE9102552U1/en
Priority claimed from DE9113981U external-priority patent/DE9113981U1/en
Application filed by Liebherr Werk Ehingen GmbH filed Critical Liebherr Werk Ehingen GmbH
Priority to DE9218841U priority Critical patent/DE9218841U1/en
Publication of EP0499208A2 publication Critical patent/EP0499208A2/en
Publication of EP0499208A3 publication Critical patent/EP0499208A3/en
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Publication of EP0499208B1 publication Critical patent/EP0499208B1/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
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs

Definitions

  • the invention relates to a telescopic boom for mobile cranes, consisting of an outer link piece pivotally mounted on the vehicle or its superstructure, in which a plurality of telescopically collapsible and extendable telescopic sections are held, each section being provided with bearings for the section guided therein and with this section is lockable and a hydraulic pressure medium piston-cylinder unit is provided for extending and retracting the individual shots.
  • the individual telescopic sections have a substantially box-like profile, the lower straps of the individual sections having flat V-shaped profiles or flat channel-shaped profiles that pass through from a flat one middle web part angled legs are formed. These lower belts are welded to the edge areas of the downward facing legs of U-shaped profile parts with rounded corner areas between their web parts and legs to form box-shaped profiles.
  • the individual telescopic sections are mounted one inside the other on the trough-shaped lower chords according to the pressure distribution ratio known from DE-PS 21 48 966, the bearing forces being transmitted in the region of the upper rounded corners of the box profiles by rollers or appropriately shaped bearing shoes.
  • bulge stiffeners with U-shaped profiles are welded onto the inside or outside of the legs of the profile.
  • the lower flange which is mainly subjected to bending forces, is stiffened by its V-shape or the two longitudinal bends that form the channel shape and secured against dents.
  • the known telescopic boom is not only sensitive to bulges despite the welded-in buckling stiffeners and the buckling lines, it can also be produced only with increased effort because of its complicated cross-sectional shape. Telescopic booms are not only subjected to bending, but also to torsion. In this case, the bearing elements arranged in the lower flange with a channel-shaped or V-shaped cross section counteract rotation. But if the telescopic boom is provided with a luffing needle, this is or the like via a rear A-frame.
  • the object of the invention is to provide a telescopic boom of the type specified, which is characterized by a simple and economically producible construction with great bending stiffness and resistance to buckling of its individual shots.
  • the articulation piece and the shots consist of profiles, each of which has a lower round and an upper half-box-shaped part in the horizontal position (pivoted onto the vehicle), the opposing legs of which are connected to one another.
  • an upper semi-box-shaped profile is thus connected to a lower round profile in a horizontal parting plane.
  • the lower round profile can for example be a semicircular profile.
  • the lower profile part preferably has approximately the shape of a half ellipse with the apex formed by the small radius.
  • the profile according to the invention thus consists of different profile parts with respect to its horizontal axis, while it is symmetrical about its vertical axis.
  • the profile according to the invention meets the requirements for a telescopic boom in a particularly favorable manner.
  • the profiles of the individual shots of a telescopic boom are primarily subjected to tension in their upper area and to pressure in their lower area during operation, so that the lower area is highly susceptible to buckling.
  • stiffening sheets were welded into the profile on the inside and / or outside to increase the buckling stiffness.
  • the profile according to the invention meets the demands of a telescopic boom in a particularly favorable manner, because the lower region, which is highly sensitive to buckling, consists of a round profile which is much less sensitive to buckling than box-shaped profiles.
  • the buckling sensitivity of the lower profile part increases with the increasing compressive stress, i.e. in the direction of the lower apex line. It is therefore particularly advantageous to design the lower profile part in the form of a semi-ellipse, because this their apex region has the smallest radius of curvature and therefore has the least sensitivity to buckling in the region with the greatest compressive stress.
  • the legs of the upper profile part can be at right angles to the straight web part forming the upper chord. Since the upper profile part is subjected to tension, the risk of buckling is low, so that the straight profile legs are accepted.
  • the legs of the upper profile part form an obtuse angle with the straight web part. Due to this obtuse angle, the round profile part extends into the upper area of the overall profile, so that in particular the middle profile part is also less sensitive to dents.
  • the lateral stress curve is highest in the middle of the profile, which increases the compressive stress in this area. If the curvature continues upwards over the center of the profile, the buckling stiffness in this area is improved.
  • the legs of the upper profile part enclose acute angles with the straight web part.
  • This embodiment takes into account the lateral stress curve, the corresponding risk of buckling in the lateral area, if necessary, being taken into account by appropriate measures. For example, larger sheet thicknesses can be selected or buckling stiffeners can be welded in.
  • the legs of the lower round profile part connect tangentially to the straight legs of the upper profile part.
  • the legs of the upper profile part are expediently connected to the straight web part by rounded regions.
  • This embodiment makes it possible to arrange bearings for guiding and holding the telescopic shots in the rounded areas.
  • the top shell of each shot can be folded in one piece over its entire length, so that there are no weld seams and in particular no transverse weld seams in the pull zone.
  • the upper shell can be placed on a straight plate and does not need to be held in special facilities, as with a complete oval boom profile.
  • the semi-box-shaped upper profile part creates additional advantages, which consist in the fact that the hoisting rope can lay down on the wide top chord without slipping sideways. Furthermore, the flat upper web part of the upper profile part is also useful for maintenance purposes, since it can be walked on safely. The upper profile part can also be sprayed with a rough covering, so that the necessary sliding security is given when walking on.
  • the arrangement of the bearings in the rounded area between the upper straight web part and the legs of the upper profile part makes it possible to keep the straight side profile walls free of bearings, so that they can be painted for corrosion protection and labeled.
  • all boom sections are locked to one another in the extended and retracted state and that only one pressure medium piston cylinder unit articulated at one end with the boom linkage piece of the outer shot is provided, which extends and retracts only one shot that was previously unlocked .
  • This configuration ensures that the individual shots are torsionally rigidly connected to one another by their constant locking. If a lock is released for the purpose of extending and retracting a shot, these two shots are secured against rotation by this connecting pressure-piston cylinder unit, the pressure-piston cylinder unit being provided with a suitable anti-rotation device.
  • an arrangement can be selected as is known from the older, but not previously published utility model G 90 13 210.6.
  • the piston rod of the piston-cylinder unit can therefore be articulated on the boom link piece and a driver device for the individual shots can be arranged in the region of the end of the cylinder from which the piston rod emerges.
  • a driver device for the individual shots can be arranged in the region of the end of the cylinder from which the piston rod emerges.
  • only such a large length of the telescopic cylinder is buckled that corresponds to the extended part of the piston rod plus the necessary clamping length.
  • the receptacles for the coupling pieces of the driver device can be arranged at the inner ends of the telescopic shots.
  • the receptacles for the coupling pieces of the driver device are expediently on ring-shaped frame parts at the inner ends of the telescopic sections intended. These recordings are expediently arranged in pairs opposite one another. They can consist of holes or bushings for retractable bolts.
  • the receptacles can advantageously be arranged in common planes parallel to the center line of the shots.
  • bolts which can be actuated hydraulically or by compressed air and suspension are expediently provided on their collar-like thickened end regions.
  • the bolts can be provided with cone-like or beveled centerings, which correct slight twists during the extension and retraction of individual shots when locking.
  • the outer link 1 of the telescopic boom 2 is provided with a joint piece 3, by means of which it is attached to the superstructure of a crane, crane vehicle or the like. is articulated.
  • the piston rod of a hydraulic piston-cylinder unit 5 is articulated in the joint 4 on the part enclosed by the outer articulation piece 1.
  • a square profile 6 is articulated in a torsion-proof manner above it on the boom link piece 4.
  • the articulation piece and the further telescopic shots are provided in the region of their ends with collar-like stiffeners 8-10, on which pressure medium piston cylinder units provided with locking bolts are arranged.
  • the innermost telescopic shot is, as can be seen from Fig. 1, provided at its outer end with a roller head.
  • Fig. 2 the cross section through a telescopic section or an outer link of a telescopic boom can be seen, which consists of a lower semi-elliptical profile part 40 and an upper semi-box-shaped profile part 41, the legs of which are welded together in a horizontal parting plane by welds 42, 43.
  • the legs 44, 45 of the upper half-box-shaped profile part are connected to the upper web part 46 by curved regions 47, 48 with the bending radius RL.
  • the lower profile part 40 is formed by a shell with a semi-elliptical cross-section, the profile shape being able to be described with a great approximation to an ellipse by the three radii ri, Rmi and Ri.
  • a simplification can be made if the cross-sectional shape is defined only by the two radii ri and Rmi.
  • the shape of the ellipse changes only slightly as a result of the simplifications described in the production, although from a static point of view these can even be favorable under certain circumstances. This is because the area of the bulge-resistant shell with the radius ri or the angle Ey2 becomes larger and the radius Rmi can be guided almost to the middle of the profile. This eliminates the larger and therefore less dent-proof area with the radius Ri. As a result, the lower shell 40 is overall more rigid, since the buckling security decreases linearly with the increase in the radii.
  • the profile acc. Fig. 3 differs from that of FIG. 2 only in that the upper profile shell 41 'with semi-box-shaped profile legs 44' and 45 ', which include obtuse angles with the web part 46'.
  • the profile acc. Fig. 4 has an upper shell 41 "consisting of a semi-box-shaped profile, the profile legs 44" and 45 "including acute angles with the web part 46".
  • the constructive middle between the dimensions H1 and H2 is the middle of the profile.
  • the lower part usually has the shape of a half ellipse, which also forms the lower structural profile shell.
  • the lower part can be extended upwards by dimension V, which means that dimension H2 of the upper shell is shortened accordingly.
  • profile acc. Fig. 2 is the least by the uniform, lateral stress curve in the upper profile half or the upper shell, the build-up of the compressive stress in the upper bulge-sensitive side wall.
  • the production of this profile is easier than that of the profiles acc. 3 and 4, since the legs 44, 45 form right angles with the web part of the upper shell, which are easier to control in steel construction because of the existing aids.
  • the lateral stress curve is highest in the middle of the profile, which results in an increase in the compressive stress in this area compared to the profile according to FIG. 12.
  • the radius Ri continues upward beyond the center of the profile, the buckling stiffness is thereby improved, so that this is not disadvantageous.
  • the lateral stress curve has the highest value at the point at which the radius RL begins. Since the curvature by the radius R has already ended below the center of the profile, the flat profile side, which is not stiff against bulging, is larger and also shifted downwards. This area receives higher compressive stresses due to these influences. The less favorable buckling behavior may have to be compensated for by appropriate measures (larger sheet thickness or buckling strips).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

A telescopic jib for cranes consists of an outer articulation piece which is pivotably mounted on the vehicle or its superstructure and in which several retractable and extendable telescopic sections are held. Each section is provided with bearing arrangements for the section guided in it and can be locked to this section. A hydraulic pressure-medium piston-cylinder unit is provided for the extension and retraction of the individual sections. In order to provide a telescopic jib which has considerable flexural rigidity in its individual sections and is simple and economical to manufacture, the articulation piece and the sections have round profiles.

Description

Die Erfindung betrifft einen Teleskopausleger für Fahrzeugkrane, bestehend aus einem auf dem Fahrzeug bzw. dessen Oberwagen schwenkbar gelagerten äußeren Anlenkstück, in dem mehrere teleskopartig zusammenschiebbare und ausfahrbare Teleskopschüsse gehaltert sind, wobei jeder Schuß mit Lagerungen für den in diesem geführten Schuß versehen und mit diesem Schuß verriegelbar ist und wobei eine hydraulische Druckmittel-Kolben-Zylinder-Einheit zum Aus- und Einfahren der einzelnen Schüsse vorgesehen ist.The invention relates to a telescopic boom for mobile cranes, consisting of an outer link piece pivotally mounted on the vehicle or its superstructure, in which a plurality of telescopically collapsible and extendable telescopic sections are held, each section being provided with bearings for the section guided therein and with this section is lockable and a hydraulic pressure medium piston-cylinder unit is provided for extending and retracting the individual shots.

Bei einem beispielsweise aus der DE-B-21 48 966 bekannten Teleskopausleger dieser Art weisen die einzelnen Teleskopschüsse ein im wesentlichen kastenartiges Profil auf, wobei die unteren Gurte der einzelnen Schüsse flache V-förmige Profile oder flache rinnenförmige Profile aufweisen, die durch von einem ebenen mittleren stegteil abgewinkelte Schenkel gebildet sind. Diese unteren Gurte sind mit den Randbereichen der nach unten weisenden Schenkel von U-förmig profilierten Profilteilen mit abgerundeten Eckbereichen zwischen deren Stegteilen und Schenkeln zu kastenförmigen Profilen verschweißt, wobei im Bereich der Schweißverbindungen zusätzlich noch aussteifende strebenartige Bleche eingeschweißt sein können. Die einzelnen Teleskopschüsse sind ineinander auf den rinnenförmig profilierten Untergurten nach dem aus der DE-PS 21 48 966 bekannten Druckverteilungsverhältnis gelagert, wobei im Bereich der oberen angerundeten Ecken der Kastenprofile die Lagerkräfte durch Rollen oder entsprechend geformte Lagerschuhe übertragen werden. Um die Seitenwandungen des U-förmigen Profilteils gegen Beulen zu schützen, sind auf die Innen- oder Außenseite der Schenkel des Profils U-förmig profilierte Beulsteifen eingeschweißt. Der Untergurt, der hauptsächlich durch Biegekräfte belastet ist, ist durch seine V-Form oder die beiden längsverlaufenden, die Rinnenform bildenden Knicke ausgesteift und gegen Beulen gesichert.In a telescopic boom of this type, known from DE-B-21 48 966, for example, the individual telescopic sections have a substantially box-like profile, the lower straps of the individual sections having flat V-shaped profiles or flat channel-shaped profiles that pass through from a flat one middle web part angled legs are formed. These lower belts are welded to the edge areas of the downward facing legs of U-shaped profile parts with rounded corner areas between their web parts and legs to form box-shaped profiles. The individual telescopic sections are mounted one inside the other on the trough-shaped lower chords according to the pressure distribution ratio known from DE-PS 21 48 966, the bearing forces being transmitted in the region of the upper rounded corners of the box profiles by rollers or appropriately shaped bearing shoes. In order to protect the side walls of the U-shaped profile part against dents, bulge stiffeners with U-shaped profiles are welded onto the inside or outside of the legs of the profile. The lower flange, which is mainly subjected to bending forces, is stiffened by its V-shape or the two longitudinal bends that form the channel shape and secured against dents.

Der bekannte Teleskopausleger ist trotz der eingeschweißten Beulsteifen und der Knicklinien nicht nur gegen Beulen empfindlich, er laßt sich darüber hinaus wegen seiner komplizierten Querschnittsform auch nur mit erhöhtem Aufwand herstellen. Teleskopausleger werden nicht nur auf Biegung, sondern darüber hinaus auch auf Torsion belastet. Dabei wirken die in dem Untergurt mit rinnen- oder V-förmigen Querschnitt angeordneten Lagerelemente einer Verdrehung entgegen. Ist aber der Teleskopausleger mit einer wippbaren Nadel versehen, wird dieser über einen hinteren A-Bock o.dgl. durch Abspannseile abgespannt, so daß eine Torsionskräfte übertragende Führung in den Lagerelementen der V-förmigen Untergurte aufgehoben werden kann, wenn das nach hinten wirkende Moment gleich oder größer ist als das nach vorne wirkende und sich aus Last- und Nadelauslegergewicht ergebende Moment.The known telescopic boom is not only sensitive to bulges despite the welded-in buckling stiffeners and the buckling lines, it can also be produced only with increased effort because of its complicated cross-sectional shape. Telescopic booms are not only subjected to bending, but also to torsion. In this case, the bearing elements arranged in the lower flange with a channel-shaped or V-shaped cross section counteract rotation. But if the telescopic boom is provided with a luffing needle, this is or the like via a rear A-frame. anchored by guy ropes so that a torsional force-transmitting guide in the bearing elements of the V-shaped lower chords can be canceled if the moment acting backwards is equal to or greater than the moment acting forward and resulting from the load and the jib weight.

Um einen Teleskopausleger unabhängig von seinem Verschiebelager eine ausreichende Torsionssteifigkeit zu verleihen, ist es bekannt, die einzelnen Auslegerschüsse miteinander zu verbolzen und zusätzlich noch mit seitlichen Führungslagern zu versehen.In order to give a telescopic boom sufficient torsional rigidity regardless of its sliding bearing, it is known to bolt the individual boom sections to one another and additionally to provide them with lateral guide bearings.

Aufgabe der Erfindung ist es, einen Teleskopausleger der eingangs angegebenen Art zu schaffen, der sich bei großer Biegesteifigkeit und Beulunempfindlichkeit seiner einzelnen Schüsse durch eine einfache und wirtschaftlich herstellbare Konstruktion auszeichnet.The object of the invention is to provide a telescopic boom of the type specified, which is characterized by a simple and economically producible construction with great bending stiffness and resistance to buckling of its individual shots.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Anlenkstück und die Schüsse aus Profilen bestehen, von denen jedes in der horizontalen (auf das Fahrzeug geschwenkten) Lage einen unteren runden und einen oberen halbkastenförmigen Teil aufweist, deren gegeneinander gerichteten Schenkel miteinander verbunden sind. Bei dem erfindungsgemäßen Profil ist also in einer horizontalen Trennebene ein oberes halbkastenförmiges Profil mit einem unteren runden Profil verbunden. Das untere runde Profil kann beispielsweise ein halbkreis-förmiges Profil sein. Vorzugsweise besitzt der untere Profilteil etwa die Form einer halben Ellipse mit dem durch den kleinen Radius gebildeten Scheitel. Das erfindungsgemäße Profil besteht also bezogen auf seine horizontale Achse aus unterschiedlichen Profilteilen, während es um seine vertikale Achse symmetrisch ist.According to the invention, this object is achieved in that the articulation piece and the shots consist of profiles, each of which has a lower round and an upper half-box-shaped part in the horizontal position (pivoted onto the vehicle), the opposing legs of which are connected to one another. In the profile according to the invention, an upper semi-box-shaped profile is thus connected to a lower round profile in a horizontal parting plane. The lower round profile can for example be a semicircular profile. The lower profile part preferably has approximately the shape of a half ellipse with the apex formed by the small radius. The profile according to the invention thus consists of different profile parts with respect to its horizontal axis, while it is symmetrical about its vertical axis.

Das erfindungsgemäße Profil wird in besonders günstiger Weise den Anforderungen an einen Teleskopausleger gerecht. Die Profile der einzelnen Schüsse eines Teleskopauslegers sind während des Betriebes in erster Linie in ihrem oberen Bereich auf Zug und in ihrem unteren Bereich auf Druck beansprucht, so daß der untere Bereich stark beulempfindlich ist. Bei herkömmlichen Profilen, die entweder eine Kastenform aufwiesen oder ausgehend von einer Kastenform mit einem unteren V-förmigen Profilteil versehen waren, wurden zur Erhöhung der Beulsteifigkeit innen und/oder außen in das Profil aussteifende Bleche eingeschweißt. Das erfindungsgemäße Profil wird in besonders günstiger Weise den Beanspruchungen eines Teleskopauslegers gerecht, weil der untere stark beulempfindliche Bereich aus einem runden Profil besteht, das sehr viel weniger beulempfindlich ist als kastenförmige Profile.The profile according to the invention meets the requirements for a telescopic boom in a particularly favorable manner. The profiles of the individual shots of a telescopic boom are primarily subjected to tension in their upper area and to pressure in their lower area during operation, so that the lower area is highly susceptible to buckling. In the case of conventional profiles, which either had a box shape or, starting from a box shape, were provided with a lower V-shaped profile part, stiffening sheets were welded into the profile on the inside and / or outside to increase the buckling stiffness. The profile according to the invention meets the demands of a telescopic boom in a particularly favorable manner, because the lower region, which is highly sensitive to buckling, consists of a round profile which is much less sensitive to buckling than box-shaped profiles.

Die Beulempfindlichkeit des unteren Profilteils nimmt mit der wachsenden Druckspannung, also in Richtung auf die untere Scheitellinie zu. Besonders günstig ist daher die Ausgestaltung des unteren Profilteils in Form einer Halbellipse, weil diese in ihrem Scheitelbereich den kleinsten Krümmungsradius aufweist und daher in dem Bereich mit der größten Druckspannung die geringste Beulempfindlichkeit besitzt.The buckling sensitivity of the lower profile part increases with the increasing compressive stress, i.e. in the direction of the lower apex line. It is therefore particularly advantageous to design the lower profile part in the form of a semi-ellipse, because this their apex region has the smallest radius of curvature and therefore has the least sensitivity to buckling in the region with the greatest compressive stress.

Die Schenkel des oberen Profilteils können rechtwinkelig zu dem den Obergurt bildenden geraden Stegteil stehen. Da der obere Profilteil auf Zug beansprucht wird, ist die Beulgefahr gering, so daß die geraden Profilschenkel in Kauf genommen werden.The legs of the upper profile part can be at right angles to the straight web part forming the upper chord. Since the upper profile part is subjected to tension, the risk of buckling is low, so that the straight profile legs are accepted.

Nach einer vorteilhaften Ausführungsform schließen die Schenkel des oberen Profilteils mit dem geraden Stegteil einen stumpfen Winkel ein. Durch diesen stumpfen Winkel erstreckt sich der runde Profilteil bis in den oberen Bereich des Gesamtprofils, so daß insbesondere auch der mittlere Profilteil unempfindlicher gegen Beulen ist. Der seitliche Spannungsverlauf ist nämlich in der Mitte des Profils am höchsten, wodurch eine Erhöhung der Druckspannung in diesem Bereich entsteht. Ist die Krümmung über die Profilmitte nach oben fortgesetzt, wird die Beulsteifigkeit in diesem Bereich verbessert.According to an advantageous embodiment, the legs of the upper profile part form an obtuse angle with the straight web part. Due to this obtuse angle, the round profile part extends into the upper area of the overall profile, so that in particular the middle profile part is also less sensitive to dents. The lateral stress curve is highest in the middle of the profile, which increases the compressive stress in this area. If the curvature continues upwards over the center of the profile, the buckling stiffness in this area is improved.

Nach einer weiteren Ausführungsform ist vorgesehen, daß die Schenkel des oberen Profilteils mit dem geraden Stegteil spitze Winkel einschließen. Durch diese Ausführungsform wird dem seitlichen Spannungsverlauf Rechnung getragen, wobei der dadurch gegebenen Beulgefahr in dem seitlichen Bereich, falls erforderlich, durch entsprechende Maßnahmen Rechnung getragen werden kann. Beispielsweise können größere Blechstärken gewählt oder Beulsteifen eingeschweißt werden.According to a further embodiment it is provided that the legs of the upper profile part enclose acute angles with the straight web part. This embodiment takes into account the lateral stress curve, the corresponding risk of buckling in the lateral area, if necessary, being taken into account by appropriate measures. For example, larger sheet thicknesses can be selected or buckling stiffeners can be welded in.

Die stumpfen und spitzen Winkel der vorstehend beschriebenen Profilformen brauchen nur wenig von 90 abzuweichen.The obtuse and acute angles of the profile shapes described above need only deviate slightly from 90.

Um einen stufenlosen Übergang der beiden Profilteile zu erreichen, schließen die Schenkel des unteren runden Profilteils tangential an die geraden Schenkel des oberen Profilteils an.In order to achieve a smooth transition of the two profile parts, the legs of the lower round profile part connect tangentially to the straight legs of the upper profile part.

Zweckmäßigerweise sind die Schenkel des oberen Profilteils durch abgerundete Bereiche mit dem geraden Stegteil verbunden. Diese Ausführungsform ermöglicht es, in den abgerundeten Bereichen Lager zur Führung und Halterung des austeleskopierbaren Schüsse anzuordnen.The legs of the upper profile part are expediently connected to the straight web part by rounded regions. This embodiment makes it possible to arrange bearings for guiding and holding the telescopic shots in the rounded areas.

Die Oberschale eines jeden Schusses kann aus einem Stück in der gesamten Länge gekantet werden, so daß in der Zugzone keine Schweißnähte und insbesondere keine querverlaufende Schweißnähte vorhanden sind.The top shell of each shot can be folded in one piece over its entire length, so that there are no weld seams and in particular no transverse weld seams in the pull zone.

Bei der Fertigung der Auslegerschüsse kann die Oberschale auf eine gerade Platte aufgelegt werden und braucht nicht, wie bei einem vollständigen ovalen Auslegerprofil in besonderen Einrichtungen festgehalten zu werden.During the manufacture of the boom sections, the upper shell can be placed on a straight plate and does not need to be held in special facilities, as with a complete oval boom profile.

Im praktischen Kranbetrieb schafft das halbkastenförmige obere Profilteil zusätzliche Vorteile, die darin bestehen, daß sich das Hubseil auf den breiten Obergurt ablegen kann, ohne seitlich abzurutschen. Weiterhin ist der flache obere Stegteil des oberen Profilteils auch zu Wartungszwecken zweckmäßig, da dieser gefahrlos begangen werden kann. Das obere Profilteil kann zusätzlich auch mit einem rauhen Belag gespritzt werden, so daß die erforderliche Gleitsicherheit beim Begehen gegeben ist.In practical crane operation, the semi-box-shaped upper profile part creates additional advantages, which consist in the fact that the hoisting rope can lay down on the wide top chord without slipping sideways. Furthermore, the flat upper web part of the upper profile part is also useful for maintenance purposes, since it can be walked on safely. The upper profile part can also be sprayed with a rough covering, so that the necessary sliding security is given when walking on.

Die Anordnung der Lagerungen in dem abgerundeten Bereich zwischen dem oberen geraden Stegteil und den Schenkeln des oberen Profilteils ermöglicht es, die geraden seitlichen Profilwände frei von Lagerungen zu halten, so daß diese zum Zwecke des Korrosionsschutzes lackiert und mit Beschriftungen versehen werden können.The arrangement of the bearings in the rounded area between the upper straight web part and the legs of the upper profile part makes it possible to keep the straight side profile walls free of bearings, so that they can be painted for corrosion protection and labeled.

Nach einer Ausgestaltung ist vorgesehen, daß sämtliche Auslegerschüsse im aus- und eingefahrenen Zustand miteinander verriegelt sind und daß nur eine einendig mit dem Auslegeranlenkstück des äußeren Schusses angelenkte Druckmittelkolbenzylindereinheit vorgesehen ist, die jeweils nur einen Schuß, der zuvor entriegelt worden ist, aus-und einfährt. Diese Ausgestaltung stellt sicher, daß die einzelnen Schüsse durch ihre ständige Verriegelung miteinander torsionssteif miteinander verbunden sind. Wird eine Verriegelung zum Zwecke des Aus- und Einfahrens eines Schusses gelöst, sind diese beiden Schüsse durch diese verbindende Druckmittelkolbenzylindereinheit gegen Verdrehen gesichert, wobei die Druckmittelkolbenzylindereinheit mit einer geeigneten Verdrehsicherung zu versehen ist.According to one embodiment, it is provided that all boom sections are locked to one another in the extended and retracted state and that only one pressure medium piston cylinder unit articulated at one end with the boom linkage piece of the outer shot is provided, which extends and retracts only one shot that was previously unlocked . This configuration ensures that the individual shots are torsionally rigidly connected to one another by their constant locking. If a lock is released for the purpose of extending and retracting a shot, these two shots are secured against rotation by this connecting pressure-piston cylinder unit, the pressure-piston cylinder unit being provided with a suitable anti-rotation device.

Zur Verriegelung der einzelnen Schüsse miteinander und zu deren Aus- und Einfahren kann eine Anordnung gewählt werden, wie sie aus dem älteren, aber nicht vorveröffentlichten Gebrauchsmuster G 90 13 210.6 bekannt ist. Zweckmäßigerweise kann also die Kolbenstange der Kolben-Zylinder-Einheit an dem Auslegeranlenkstück angelenkt und eine Mitnehmereinrichtung für die einzelnen Schüsse in dem Bereich des Endes des Zylinders angeordnet sein, aus dem die Kolbenstange austritt. Bei dieser Ausgestaltung wird immer nur eine so große Länge des Teleskopierzylinders auf Knickung beansprucht, die dem jeweils ausgefahrenen Teil der Kolbenstange zuzüglich der notwendigen Einspannlänge entspricht. Weiterhin können die Aufnahmen für die Kupplungsstücke der Mitnehmereinrichtung an den inneren Enden der austeleskopierbaren Schüsse eingeordnet sein. Zum Aus- und Einfahren eines Schusses wird immer nur diese an die Mitnehmereinrichtung angekuppelt, so daß die Steuerung der Verbolzungen insgesamt einfacher und überschaubarer wird. Die Aufnahmen für die Kupplungsstücke der Mitnehmereinrichtung sind zweckmäßigerweise an ringförmigen Rahmenteilen an den inneren Enden der Teleskopschüsse vorgesehen. Diese Aufnahmen sind zweckmäßigerweise paarweise einander gegenüberliegend angeordnet. Sie können aus Bohrungen oder Buchsen für einfahrbare Bolzen bestehen. In vorteilhafter Weise können die Aufnahmen in gemeinsamen zur Mittellinie der Schüsse parallelen Ebenen angeordnet sein. Diese Ausgestaltung gestattet es, daß die Kupplungsstücke der Mitnehmereinrichtung an dem Teleskopierzylinder, bei denen es sich in der Regel um Bolzen handeln wird, zum Ankuppeln jedes der Schüsse nur um gleiche Beträge ausgefahren werden muß, so daß die Mitnehmereinrichtung insgesamt unkomplizierter ausgebildet werden kann und die Kupplungsstücke bzw. Bolzen für einander gegenüberliegende Aufnahmen dichter beieinander liegen können. Zur näheren Darstellung der Einrichtungen zum Verriegeln und Entriegeln der Schüsse miteinander und zum Aus- und Einfahren der Schüsse wird auf das ältere Gebrauchsmuster DE-U-90 13 210.6 Bezug genommen.To lock the individual shots together and to extend and retract them, an arrangement can be selected as is known from the older, but not previously published utility model G 90 13 210.6. Expediently, the piston rod of the piston-cylinder unit can therefore be articulated on the boom link piece and a driver device for the individual shots can be arranged in the region of the end of the cylinder from which the piston rod emerges. In this embodiment, only such a large length of the telescopic cylinder is buckled that corresponds to the extended part of the piston rod plus the necessary clamping length. Furthermore, the receptacles for the coupling pieces of the driver device can be arranged at the inner ends of the telescopic shots. To extend and retract a shot, only this is always coupled to the driver device, so that the control of the bolts is easier and more manageable overall. The receptacles for the coupling pieces of the driver device are expediently on ring-shaped frame parts at the inner ends of the telescopic sections intended. These recordings are expediently arranged in pairs opposite one another. They can consist of holes or bushings for retractable bolts. The receptacles can advantageously be arranged in common planes parallel to the center line of the shots. This configuration allows that the coupling pieces of the driver device on the telescopic cylinder, which will usually be bolts, only have to be extended by the same amount to couple each of the shots, so that the driver device can be made more uncomplicated overall and that Couplings or bolts can be closer together for opposite shots. For a more detailed description of the devices for locking and unlocking the shots with one another and for extending and retracting the shots, reference is made to the older utility model DE-U-90 13 210.6.

Zur Verriegelung der einzelnen Schüsse miteinander sind zweckmäßigerweise hydraulisch oder durch Druckluft und Federung betätigbare Bolzen an deren kragenartig verdickten Endbereichen vorgesehen.In order to lock the individual shots to one another, bolts which can be actuated hydraulically or by compressed air and suspension are expediently provided on their collar-like thickened end regions.

Die Bolzen können mit konusartigen oder angeschrägten Zentrierungen versehen sein, die geringfügige Verdrehungen während des Aus- und Einfahrens einzelner Schüsse beim Verriegeln korrigieren.The bolts can be provided with cone-like or beveled centerings, which correct slight twists during the extension and retraction of individual shots when locking.

Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnung näher beschrieben. In dieser zeigt

  • Fig. 1 a - n einen Teleskopausleger in unterschiedlichen Ausfahrzuständen seiner Teleskopschüsse,
  • Fig. 2 einen Querschnitt durch einen Teleskopschuß bzw. ein äußeres Anlenkstück mit einem aus einem halbkastenförmigen Teil und einem runden Teil zusammengesetztem Profil,
  • Fig. 2 a bis 2 h die zugehörigen Biege-, Biegezug-, Biegedruck-und die zusammengesetzten Beanspruchungen darstellenden Diagramme,
  • Fig. 3 einen Querschnitt durch einen Teleskopschuß bzw. ein äußeres Anlenkstück mit einem oberen halbkastenförmigen Profil, dessen Schenkel mit dem Stegteil stumpfe Winkel einschließen, und einem unteren elliptischen Profilteil,
  • Fig. 3 a bis 3 h die zugehörigen Biege-, Biegezug-, Biegedruck-und die zusammengesetzten Beanspruchungen darstellenden Diagramme,
  • Fig. 4 einen Querschnitt durch einen Teleskopschuß bzw. ein äußeres Anlenkstück mit einem Profil, das aus einem oberen halbkastenförmigen Profil, dessen Schenkel mit dem Stegteil spitze Winkel einschließen, und einem unteren elliptischen Profil zusammengesetzt ist,
  • Fig. 4 a bis 4 h die zugehörigen Biege-, Biegezug-, Biegedruck-und die zusammengesetzten Beanspruchungen darstellenden Diagramme.
Embodiments of the invention are described below with reference to the drawing. In this shows
  • 1 a - n a telescopic boom in different extension states of its telescopic sections,
  • 2 shows a cross section through a telescopic section or an outer link with a profile composed of a half-box-shaped part and a round part,
  • 2 a to 2 h the associated bending, bending tension, bending pressure and the composite stress diagrams,
  • 3 shows a cross section through a telescopic section or an outer link piece with an upper semi-box-shaped profile, the legs of which form obtuse angles with the web part, and a lower elliptical profile part,
  • 3 a to 3 h the associated bending, bending tensile, bending pressure and the composite stress diagrams,
  • 4 shows a cross section through a telescopic section or an outer link with a profile which is composed of an upper semi-box-shaped profile, the legs of which form an acute angle with the web part, and a lower elliptical profile,
  • 4 a to 4 h the associated bending, bending tension, bending pressure and the composite stress diagrams.

Wie aus Fig. 1 ersichtlich ist, ist das äußere Anlenkstück 1 des Teleskopauslegers 2 mit einem Gelenkstück 3 versehen, über das dieses an dem Oberwagen eines Krans, Kranfahrzeuges o.dgl. angelenkt ist. An dem von dem äußeren Anlenkstück 1 eingefaßten Teil ist im Gelenk 4 die Kolbenstange einer hydraulischen Kolben-Zylinder-Einheit 5 angelenkt.As can be seen from Fig. 1, the outer link 1 of the telescopic boom 2 is provided with a joint piece 3, by means of which it is attached to the superstructure of a crane, crane vehicle or the like. is articulated. The piston rod of a hydraulic piston-cylinder unit 5 is articulated in the joint 4 on the part enclosed by the outer articulation piece 1.

Parallel zu der Kolbenzylindereinheit 5 ist oberhalb von dieser an dem Auslegeranlenkstück 4 verdrehsicher ein Vierkantprofil 6 angelenkt.Parallel to the piston-cylinder unit 5, a square profile 6 is articulated in a torsion-proof manner above it on the boom link piece 4.

Das Anlenkstück und die weiteren austeleskopierbaren Schüsse sind im Bereich ihrer Enden mit kragenartigen Versteifungen 8-10 versehen, auf denen mit Verriegelungsbolzen versehene Druckmittelkolbenzylindereinheiten angeordnet sind. Der innerste austeleskopierbare Schuß ist, wie aus Fig. 1 ersichtlich ist, an seinem äußeren Ende mit einem Rollenkopf versehen.The articulation piece and the further telescopic shots are provided in the region of their ends with collar-like stiffeners 8-10, on which pressure medium piston cylinder units provided with locking bolts are arranged. The innermost telescopic shot is, as can be seen from Fig. 1, provided at its outer end with a roller head.

Aus Fig. 2 ist der Querschnitt durch einen Teleskopschuß bzw. ein äußeres Anlenkstück eines Teleskopauslegers ersichtlich, das aus einem unteren halbelliptischen Profilteil 40 und einem oberen halbkastenförmigen Profilteil 41 besteht, dessen Schenkel in einer horizontalen Trennebene durch Schweißnähte 42,43 miteinander verschweißt sind. Die Schenkel 44,45 des oberen halbkastenförmigen Profilteils sind mit dem oberen Stegteil 46 durch gekrümmte Bereiche 47,48 mit dem Biegeradius RL verbunden. Das untere Profilteil 40 ist durch eine Schale mit halbelliptischen Querschnitt gebildet, wobei sich die Profilform mit großer Annäherung an eine Ellipse durch die drei Radien ri, Rmi und Ri beschreiben läßt. Aus Gründen der Fertigung kann eine Vereinfachung vorgenommen werden, wenn die Querschnittsform nur durch die beiden Radien ri und Rmi definiert wird. Die Ellipsenform ändert sich durch die beschriebenen Vereinfachungen bei der Herstellung nur geringfügig, wobei diese aus statischer Sicht unter Umständen sogar günstig sein können. Denn der Bereich der beulsteifen Schale mit dem Radius ri bzw. dem Winkel Ey2 wird größer und der Radius Rmi kann bis annähernd zur Profilmitte geführt werden. Dadurch entfällt der größere und somit weniger beulsichere Bereich mit dem Radius Ri. Hierdurch wird die Unterschale 40 insgesamt beulsteifer, da die Beulsicherheit linear mit der Vergrößerung der Radien abnimmt.From Fig. 2 the cross section through a telescopic section or an outer link of a telescopic boom can be seen, which consists of a lower semi-elliptical profile part 40 and an upper semi-box-shaped profile part 41, the legs of which are welded together in a horizontal parting plane by welds 42, 43. The legs 44, 45 of the upper half-box-shaped profile part are connected to the upper web part 46 by curved regions 47, 48 with the bending radius RL. The lower profile part 40 is formed by a shell with a semi-elliptical cross-section, the profile shape being able to be described with a great approximation to an ellipse by the three radii ri, Rmi and Ri. For manufacturing reasons, a simplification can be made if the cross-sectional shape is defined only by the two radii ri and Rmi. The shape of the ellipse changes only slightly as a result of the simplifications described in the production, although from a static point of view these can even be favorable under certain circumstances. This is because the area of the bulge-resistant shell with the radius ri or the angle Ey2 becomes larger and the radius Rmi can be guided almost to the middle of the profile. This eliminates the larger and therefore less dent-proof area with the radius Ri. As a result, the lower shell 40 is overall more rigid, since the buckling security decreases linearly with the increase in the radii.

Das Profil gem. Fig. 3 unterscheidet sich von den nach Fig. 2 nur dadurch, daß die obere Profilschale 41' mit halbkastenförmigen Profilschenkel 44' und 45' aufweist, die mit dem Stegteil 46' stumpfe Winkel einschließen.The profile acc. Fig. 3 differs from that of FIG. 2 only in that the upper profile shell 41 'with semi-box-shaped profile legs 44' and 45 ', which include obtuse angles with the web part 46'.

Das Profil gem. Fig. 4 weist eine aus einem halbkastenförmigen Profil bestehende obere Schale 41" auf, deren Profilschenkel 44" und 45" mit dem Stegteil 46" spitze Winkel einschließen.The profile acc. Fig. 4 has an upper shell 41 "consisting of a semi-box-shaped profile, the profile legs 44" and 45 "including acute angles with the web part 46".

Bei den Profilen nach den Fig. 2-4 ist die konstruktive Mitte zwischen den Maßen H1 und H2 die Profilmitte. Der untere Teil meist die Form einer halben Ellipse auf, die gleichzeitig die untere konstruktive Profilschale bildet. Der untere Teil kann aus Gründen der Fertigung durch das Maß V nach oben verlängert werden, wodurch das Maß H2 der Oberschale entsprechend verkürzt wird.2-4, the constructive middle between the dimensions H1 and H2 is the middle of the profile. The lower part usually has the shape of a half ellipse, which also forms the lower structural profile shell. For manufacturing reasons, the lower part can be extended upwards by dimension V, which means that dimension H2 of the upper shell is shortened accordingly.

Wenn die Blechstärken der unteren Schale t1 bzw. t2 mit der Stärke der Oberschale t3 und die Profilhöhen H1 bzw. H2 so abgestimmt werden, daß die Schwerpunktachse sich in der Nähe der Profilmitte befindet und die Abweichungen B2 kleiner B bzw. B 2 größer B der Profile gem. den Fig. 3 bzw. 4 im Verhältnis nicht größer als dargestellt ist, ergeben sich folgende Spannungsverhältnisse, die jeweils in den Diagrammen mit den nachgestellten Buchstaben a bis h dargestellt sind:

  • Die Druckspannung (-) ist wegen der Beulgefahr häufig die kritischste Beanspruchung bei dünnwandigen Hohlprofilen. Die größte Biege-Druckspannung entsteht durch die Hauptbelastung des Auslegers um die Achse X-X (X-Richtung) im unteren Scheitelpunkt des Radius ri. Dieses ist bei den drei Profilen gem. den Fig. 2 bis 4 gleich.
If the sheet thicknesses of the lower shell t1 or t2 are matched to the thickness of the upper shell t3 and the profile heights H1 or H2 so that the center of gravity axis is close to the profile center and the deviations B2 smaller B or B 2 greater B the Profiles acc. 3 or 4 is not larger than shown in the ratio, the following tension ratios result, which are each shown in the diagrams with the letters a to h below:
  • The compressive stress (-) is often the most critical stress for thin-walled hollow profiles due to the risk of buckling. The greatest bending compressive stress results from the main load of the boom around the axis XX (X direction) in the lower vertex of the radius ri. This is according to the three profiles. 2 to 4 the same.

Die seitliche Belastung bzw. Ausbiegung des Auslegers um die Achse Y-Y (Y-Richtung) in beiden Richtungen bewirkt in den Profil-Seitenwänden Druck- bzw. Zugspannungen, deren Größe sich im Verhältnis des Abstandes zur Trägheitsachse Y-Y ergibt.The lateral loading or bending of the boom around the axis Y-Y (Y direction) in both directions causes compressive or tensile stresses in the side walls of the profile, the magnitude of which results in relation to the distance from the axis of inertia Y-Y.

Bei allen drei Profilen sind im unteren Scheitelpunkt diese Spannungen = 0, so daß hier keine Veränderung der Druckspannung aus der X-Richtung entsteht. An der Oberkante des Profils werden infolge der Radien RL die Spannungen aus der Y-Richtung vermindert.For all three profiles, these stresses = 0 in the lower vertex, so that there is no change in the compressive stress from the X direction. At the top edge of the profile, the stresses from the Y direction are reduced as a result of the radii RL.

Entlang der Seitenwand nach oben addieren sich die Zug- bzw. Druckspannungen aus der Y-Richtung mit den Biegespannungen aus der X-Richtung.Along the side wall upwards, the tensile or compressive stresses from the Y direction add up with the bending stresses from the X direction.

Diese Spannungsverhältnisse sind zu jedem der drei Profile in den zugehörigen Diagrammen dargestellt.These tension relationships are shown for each of the three profiles in the associated diagrams.

Bei dem Profil gem. Fig. 2 ist durch den gleichmäßigen, seitlichen Spannungsverlauf in der oberen Profilhälfte bzw. der oberen Schale der Aufbau der Druckspannung in der oberen beulempfindlichen Seitenwand am geringsten. Die Herstellung dieses Profils ist einfacher als die der Profile gem. den Fig. 3 und 4, da die Schenkel 44,45 mit dem Stegteil der Oberschale rechte Winkel bilden, welche in der Stahlbaufertigung wegen der vorhandenen Hilfsmittel besser beherrschbar sind.With the profile acc. Fig. 2 is the least by the uniform, lateral stress curve in the upper profile half or the upper shell, the build-up of the compressive stress in the upper bulge-sensitive side wall. The production of this profile is easier than that of the profiles acc. 3 and 4, since the legs 44, 45 form right angles with the web part of the upper shell, which are easier to control in steel construction because of the existing aids.

Bei dem Profil gem. Fig. 3 ist der seitliche Spannungsverlauf in der Mitte des Profils am höchsten, wodurch eine Erhöhung der Druckspannung gegenüber dem Profil nach Fig. 12 in diesem Bereich entsteht. Da aber der Radius Ri über die Profilmitte nach oben hin fortgesetzt ist, wird dadurch die Beulsteifigkeit verbessert, so daß dies nicht nachteilig ist.With the profile acc. 3, the lateral stress curve is highest in the middle of the profile, which results in an increase in the compressive stress in this area compared to the profile according to FIG. 12. However, since the radius Ri continues upward beyond the center of the profile, the buckling stiffness is thereby improved, so that this is not disadvantageous.

Bei dem Profil nach Fig. 4 hat der seitliche Spannungsverlauf den höchsten Wert an der Stelle, an der der Radius RL beginnt. Da die Krümmung durch den Radius R schon unterhalb der Profilmitte beendet ist, ist die nicht beulsteife, flache Profilseite größer und zudem nach unten verlagert. Diese Fläche erhält durch diese Einflüsse höhere Druckspannungen. Das ungünstigere Beulverhalten muß daher ggf. durch entsprechende Maßnahmen (größere Blechstärke oder Beulstreifen) ausgeglichen werden.4, the lateral stress curve has the highest value at the point at which the radius RL begins. Since the curvature by the radius R has already ended below the center of the profile, the flat profile side, which is not stiff against bulging, is larger and also shifted downwards. This area receives higher compressive stresses due to these influences. The less favorable buckling behavior may have to be compensated for by appropriate measures (larger sheet thickness or buckling strips).

Claims (10)

1. A telescopic jib (2) for cranes, preferably mobile cranes, consisting of an outer articulation component (1) pivotably mounted on the vehicle or its upper chassis, wherein there are mounted several telescopically retractable and extendable telescopic sections, in which arrangement each section is provided with bearing means for the section carried therein and is lockable with this section, and wherein provision is made for a hydraulic pressure medium piston-cylinder unit for the outward movement and retraction of the individual sections,
characterized in that
the articulation component (1) and the sections consist of profiles each of which has in the horizontal position pivoted onto the vehicle, a lower round part (40) and an upper half-box shaped part (41), and whose sides (44, 45) directed towards each other are welded together.
2. A telescopic jib according to claim 1, characterized in that the lower profile part (40) approximately has the shape of a half ellipse with the apex formed by the small radius.
3. A telescopic jib according to claim 1 or 2, characterized in that the sides of the lower round profile part (40) are tangentially joined to the straight sides (44, 45) of the upper profile part (41).
4. A telescopic jib according to one of claims 1 to 3, characterized in that the sides (44, 45) of the upper profile part (41) are disposed at right angles to the straight web part (46) which forms the upper boom.
5. A telescopic jib according to one of claims 1 to 3, characterized in that the sides (44', 45') of the upper profile part (41) form obtuse angles with the straight web part (46').
6. A telescopic jib according to one of claims 1 to 3, characterized in that the sides (44, 45) of the upper profile part (41) are joined to the straight web part (46) by rounded zones (47, 48).
7. A telescopic jib according to one of claims 1 to 6, characterized in that all the jib sections are locked to each other in their extended and retracted state, and that provision is made for only one pressure medium piston-cylinder unit articulated at one end on the articulation component of the outer section, which moves out or retracts in each case only one section that has been previously unlocked.
8. A telescopic jib according to one of the preceding claims, characterized in that in the sections, there is mounted parallel to the pressure medium piston-cylinder unit, a freely running- out profiled tube secured against rotation which is articulated on the articulation component, the length of which tube corresponds to the length of the outer section and whereon the inner sections are carried for longitudinal displacement by means of sliding bearings, but being secured against rotation.
9. A telescopic jib according to claim 8, characterized in that the profiled tube is a rectangular or triangular tube.
10. A telescopic jib according to one of the preceding claims, characterized in that for locking the sections, provision is made in their end zones thickened in the manner of collars, for pins that are actuable hydraulically or by compressed air and spring action.
EP92102268A 1991-02-11 1992-02-11 Telescopic jib for mobile cranes or the like Expired - Lifetime EP0499208B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9218841U DE9218841U1 (en) 1991-02-11 1992-02-11 Telescopic boom for mobile cranes or the like

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DE9101533U 1991-02-11
DE9101533 1991-02-11
DE9102552U 1991-03-04
DE9102552U DE9102552U1 (en) 1991-02-11 1991-03-04 Telescopic boom for mobile cranes or similar
DE9113981U 1991-11-11
DE9113981U DE9113981U1 (en) 1991-11-11 1991-11-11 Telescopic boom for mobile cranes or similar

Publications (4)

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EP0499208A2 EP0499208A2 (en) 1992-08-19
EP0499208A3 EP0499208A3 (en) 1993-05-19
EP0499208B1 true EP0499208B1 (en) 1995-06-14
EP0499208B2 EP0499208B2 (en) 2001-10-17

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US6978907B2 (en) 2001-12-12 2005-12-27 Grove U.S. Llc Telescopic jib for a vehicular crane
JP2006021877A (en) * 2004-07-08 2006-01-26 Tadano Ltd Telescopic boom
WO2017065066A1 (en) * 2015-10-13 2017-04-20 株式会社タダノ Work machine boom

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DE4344795A1 (en) * 1993-12-28 1995-06-29 Liebherr Werk Ehingen Mobile crane with a telescopic boom
DE19624312C2 (en) * 1996-06-18 2000-05-31 Grove Us Llc Telescopic boom for mobile cranes
DE19811813B4 (en) * 1998-03-18 2005-11-24 Grove U.S. LLC (n.d.Ges.d.Staates Delaware) Lateral boom interlock
US6499612B1 (en) 2001-07-27 2002-12-31 Link-Belt Construction Equipment Co., L.P., Lllp Telescoping boom assembly with rounded profile sections and interchangeable wear pads
DE102006014573B3 (en) * 2006-03-29 2007-07-19 Manitowoc Crane Group France SAS, Telescopic crane jib part, has upper and lower profile parts with segments that are bent outwardly, and end segments adjoining each other at obtuse angle, where radius of segments is less than half width of cross-section
JP2010089919A (en) 2008-01-09 2010-04-22 Kobelco Cranes Co Ltd Telescopic boom

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DE1170134B (en) * 1962-05-11 1964-05-14 Focke Wulf Ges Mit Beschraenkt Height-adjustable work platform
US3250182A (en) * 1963-08-01 1966-05-10 Harold K Nansel Multiple extension apparatus
FR1415329A (en) * 1964-12-01 1965-10-22 Ver Flugtechnische Werke Height-adjustable work platform
DE2148966C3 (en) * 1971-09-30 1978-11-23 Liebherr-Werk Ehingen Gmbh, 7930 Ehingen Telescopic boom, especially for road-traveling cranes
US3842985A (en) * 1972-12-15 1974-10-22 Harnischfeger Corp Means for extending and retracting crane boom section
US4588347A (en) * 1981-10-02 1986-05-13 Coles Cranes Limited Telescopic booms
DE3216427A1 (en) * 1982-05-03 1983-11-10 Heinrich H. Klüssendorf GmbH & Co KG, 1000 Berlin Device for guiding two rod- or/and tube-like elements movable axially one inside the other
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DE3510710A1 (en) * 1985-03-23 1986-10-02 Fried. Krupp Gmbh, 4300 Essen TELESCOPIC CRANE
US4688690A (en) * 1986-03-07 1987-08-25 Harnischfeger Corporation Method and apparatus for extending fly section of crane boom
DE9013210U1 (en) * 1990-09-18 1991-01-03 Liebherr-Werk Ehingen Gmbh, 7930 Ehingen Telescoping system with reduced bending length of the telescoping cylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19711975A1 (en) * 1997-03-12 1998-09-17 Mannesmann Ag Telescopic jib for vehicle crane
DE19711975B4 (en) * 1997-03-12 2006-09-07 Terex-Demag Gmbh & Co. Kg Telescopic boom for mobile cranes
US6978907B2 (en) 2001-12-12 2005-12-27 Grove U.S. Llc Telescopic jib for a vehicular crane
JP2006021877A (en) * 2004-07-08 2006-01-26 Tadano Ltd Telescopic boom
WO2017065066A1 (en) * 2015-10-13 2017-04-20 株式会社タダノ Work machine boom

Also Published As

Publication number Publication date
EP0499208B2 (en) 2001-10-17
ATE123743T1 (en) 1995-06-15
EP0499208A3 (en) 1993-05-19
DE59202474D1 (en) 1995-07-20
EP0499208A2 (en) 1992-08-19

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