EP0499208B1 - Flèche télescopique pour grues mobiles ou analogue - Google Patents

Flèche télescopique pour grues mobiles ou analogue 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
Authority
EP
European Patent Office
Prior art keywords
telescopic jib
sections
profile
telescopic
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92102268A
Other languages
German (de)
English (en)
Other versions
EP0499208B2 (fr
EP0499208A3 (en
EP0499208A2 (fr
Inventor
Rudolf Becker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Werk Ehingen GmbH
Original Assignee
Liebherr Werk Ehingen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27208262&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0499208(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE9102552U external-priority patent/DE9102552U1/de
Priority claimed from DE9113981U external-priority patent/DE9113981U1/de
Application filed by Liebherr Werk Ehingen GmbH filed Critical Liebherr Werk Ehingen GmbH
Priority to DE9218841U priority Critical patent/DE9218841U1/de
Publication of EP0499208A2 publication Critical patent/EP0499208A2/fr
Publication of EP0499208A3 publication Critical patent/EP0499208A3/de
Publication of EP0499208B1 publication Critical patent/EP0499208B1/fr
Application granted granted Critical
Publication of EP0499208B2 publication Critical patent/EP0499208B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)

Claims (10)

1. Flèche télescopique (2) pour grues, de préférence des grues mobiles, constituée d'une pièce d'articulation extérieure (1) montée de façon pivotante sur le véhicule ou le châssis tournant de celui-ci dans laquelle sont retenus plusieurs tronçons télescopiques pouvant être rentrés et sortis télescopiquement, chaque tronçon étant pourvu de logements pour le tronçon guidé dans celui-ci et peut être verrouillé avec ce tronçon, et dans laquelle est prévue une unité hydraulique à piston et à cylindre à fluide sous pression pour la rentrée et la sortie des différents tronçons, caractérisée en ce que la pièce d'articulation (1) et les tronçons sont constitués de profils dont chacun présente dans la position horizontale, pivotée sur le véhicule, une partie inférieure ronde (40) et une partie supérieure (41) en forme de demi-caisson et dont les branches (44, 45) dirigées les unes contre les autres sont soudées.
2. Flèche télescopique selon la revendication 1, caractérisée en ce que la partie inférieure de profil (40) a approximativement la forme d'une demi-ellipse, le sommet étant formé par le petit rayon.
3. Flèche télescopique selon la revendication 1 ou 2, caractérisée en ce que les branches de la partie inférieure ronde de profil font suite tangentiellement aux branches rectilignes (44, 45) de la partie supérieure de profil (41).
4. Flèche télescopique selon l'une des revendications 1 ou 3, caractérisée en ce que les branches (44, 45) de la partie supérieure de profil (41) sont orientées à angle droit à la partie de barrette rectiligne (46) constituant le brin supérieur.
5. Flèche télescopique selon l'une des revendications 1 à 3, caractérisée en ce que les branches (44', 45') de la partie supérieure de profil (41) forment avec la partie de barrette rectiligne (46') des angles obtus.
6. Flèche télescopique selon l'une des revendications 1 à 3, caractérisée en ce que les branches (44, 45) de la partie supérieure de profil (41) sont reliées par des zones arrondies (47, 48) avec la partie de barrette rectiligne (46).
7. Flèche télescopique selon l'une des revendications 1 à 6, caractérisée en ce que tous les tronçons de flèche sont verrouillés les uns aux autres dans les états sorti et rentré, et en ce qu'il est prévu seulement une unité à piston et à cylindre à fluide sous pression articulée à une extrémité à la pièce d'articulation de flèche du tronçon extérieur qui sort ou rentre respectivement un tronçon seulement déverrouillé préalablement.
8. Flèche télescopique selon l'une des revendications précédentes, caractérisée en ce qu'il est logé, immobile en rotation, dans les tronçons parallèlement à l'unité à piston et à cylindre à fluide sous pression, un tuyau profilé articulé à la pièce d'articulation de flèche, s'étendant librement dont la longueur correspond à la longueur du tronçon extérieur et sur lequel sont guidés les tronçons intérieurs par des paliers de glissement de façon déplaçable longitudinalement, mais immobiles en rotation.
9. Flèche télescopique selon la revendication 8, caractérisée en ce que le tuyau profilé est un tuyau carré ou un tuyau triangulaire.
10. Flèche télescopique selon l'une des revendications précédentes, caractérisée en ce que sont prévus pour le verrouillage des tronçons des boulons actionnables hydrauliquement ou par de l'air comprimé et un montage à ressort aux zones d'extrémité épaissies en forme de collet.
EP92102268A 1991-02-11 1992-02-11 Flèche télescopique pour grues mobiles ou analogue Expired - Lifetime EP0499208B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9218841U DE9218841U1 (de) 1991-02-11 1992-02-11 Teleskopausleger für Fahrzeugkrane o. dgl.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE9101533 1991-02-11
DE9101533U 1991-02-11
DE9102552U 1991-03-04
DE9102552U DE9102552U1 (de) 1991-02-11 1991-03-04 Teleskopausleger für Fahrzeugkrane o.dgl.
DE9113981U DE9113981U1 (de) 1991-11-11 1991-11-11 Teleskopausleger für Fahrzeugkrane o.dgl.
DE9113981U 1991-11-11

Publications (4)

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

Family

ID=27208262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102268A Expired - Lifetime EP0499208B2 (fr) 1991-02-11 1992-02-11 Flèche télescopique pour grues mobiles ou analogue

Country Status (3)

Country Link
EP (1) EP0499208B2 (fr)
AT (1) ATE123743T1 (fr)
DE (1) DE59202474D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19711975A1 (de) * 1997-03-12 1998-09-17 Mannesmann Ag Teleskopausleger für Fahrzeugkrane
US6978907B2 (en) 2001-12-12 2005-12-27 Grove U.S. Llc Telescopic jib for a vehicular crane
JP2006021877A (ja) * 2004-07-08 2006-01-26 Tadano Ltd 伸縮ブーム
WO2017065066A1 (fr) * 2015-10-13 2017-04-20 株式会社タダノ Flèche de machine de travail

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344795A1 (de) * 1993-12-28 1995-06-29 Liebherr Werk Ehingen Fahrbarer Kran mit einem Teleskopausleger
DE19624312C2 (de) * 1996-06-18 2000-05-31 Grove Us Llc Teleskopausleger für Fahrzeugkrane
DE19811813B4 (de) * 1998-03-18 2005-11-24 Grove U.S. LLC (n.d.Ges.d.Staates Delaware) Seitliche Auslegerverriegelung
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 (de) * 2006-03-29 2007-07-19 Manitowoc Crane Group France SAS, Teleskopkran-Auslegerteil mit schwächer und stärker gekrümmten Querschnittssegmenten im oberen Profilteil und im unteren Profilteil
JP2010089919A (ja) 2008-01-09 2010-04-22 Kobelco Cranes Co Ltd 伸縮ブーム

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279493A (fr) * 1960-11-10 1961-12-22 Grue perfectionnée
DE1170134B (de) * 1962-05-11 1964-05-14 Focke Wulf Ges Mit Beschraenkt Hoehenverstellbare Arbeitsbuehne
US3250182A (en) * 1963-08-01 1966-05-10 Harold K Nansel Multiple extension apparatus
FR1415329A (fr) * 1964-12-01 1965-10-22 Ver Flugtechnische Werke Plate-forme de travail réglable en hauteur
DE2148966C3 (de) * 1971-09-30 1978-11-23 Liebherr-Werk Ehingen Gmbh, 7930 Ehingen Teleskopausleger, insbesondere für straßenverfahrbare Krane
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 (de) * 1982-05-03 1983-11-10 Heinrich H. Klüssendorf GmbH & Co KG, 1000 Berlin Einrichtung zur fuehrung zweier axial ineinander beweglicher stangen- oder/und roehrenartiger elemente
SE456820B (sv) * 1984-03-12 1988-11-07 Oesa Ab Anordning vid teleskoparmar
DE3510710A1 (de) * 1985-03-23 1986-10-02 Fried. Krupp Gmbh, 4300 Essen Teleskopkran
US4688690A (en) * 1986-03-07 1987-08-25 Harnischfeger Corporation Method and apparatus for extending fly section of crane boom
DE9013210U1 (de) * 1990-09-18 1991-01-03 Liebherr-Werk Ehingen Gmbh, 7930 Ehingen Teleskopiersystem mit verringerter Knicklänge des Teleskopierzylinders

Cited By (5)

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

Also Published As

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

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