EP2221270B1 - Securing and bolting unit - Google Patents

Securing and bolting unit Download PDF

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Publication number
EP2221270B1
EP2221270B1 EP20100075033 EP10075033A EP2221270B1 EP 2221270 B1 EP2221270 B1 EP 2221270B1 EP 20100075033 EP20100075033 EP 20100075033 EP 10075033 A EP10075033 A EP 10075033A EP 2221270 B1 EP2221270 B1 EP 2221270B1
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EP
European Patent Office
Prior art keywords
securing
gripper
piston rod
bolt
housing part
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Active
Application number
EP20100075033
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German (de)
French (fr)
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EP2221270A2 (en
EP2221270A3 (en
Inventor
Thomas Dipl.-Ing Krebs
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.)
Tadano Demag GmbH
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Terex Cranes Germany GmbH
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Publication of EP2221270A2 publication Critical patent/EP2221270A2/en
Publication of EP2221270A3 publication Critical patent/EP2221270A3/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
    • 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 securing and Verbolzungsech, for telescoping from a basic element shots, in particular the shots of a telescopic boom of a mobile crane, comprising two locking pins arranged relative to each other and a cooperating with a gripper locking bolt.
  • the font JP 2006 290 480 A discloses a securing and bolting unit according to the preamble of claim 1.
  • the object of the invention is to provide a security and Verbolzungsech, in contrast to previous SVE's no intermediate components between 'trigger element' and 'actuator' has. It should reduce the number the parts and a reduction in the weight and cost of the components can be achieved.
  • the goal would therefore be to omit the unnecessary components such as rack, slide link, spring elements, etc.
  • a securing and Verbolzungsech for a basic element telescopic shots, in particular the shots of a telescopic boom of a mobile crane, comprising two relatively displaceably arranged securing bolts and cooperating with a gripper locking bolt, wherein the safety pin and a piston rod designed Extension of the gripper together in a lower housing part arranged to be displaceable perpendicular to each other characterized in that the piston for the piston rod of the gripper is located in an upper housing part placed on the lower housing part and that the securing bolt by a guided in the one safety bolt piston rod relative to each other or are displaced apart.
  • the essence of the solution according to the invention is that the hydraulic release element is at the same time mechanical actuator, and thus the elimination of intermediate components (sliding gate, rack, etc.) is possible. Further advantages are the absolute mechanical intrinsic safety by choice of geometry, no hydraulic / electrical logic in the form of valves / switches or other to achieve intrinsic safety.
  • a telesystem can be made available, which can be used with several telescopic jibs (large cross-section to very small cross-section) as a modular principle.
  • the underlying backup cylinder can be extended to the same extent on both sides.
  • the securing and bolting unit according to the invention thus consists virtually only of 3 components, namely the housing, the safety bolt (safety cylinder), hydraulic / pneumatic and the gripper (Verbolzungszylinder), hydraulic / pneumatic.
  • the invention allows the optimal utilization of the available space, since only components are used, which also serve the immediate functions (secure, bolted).
  • the gripper is arranged perpendicular to the axis of the backup cylinder.
  • the control of the functional elements can be done hydraulically or pneumatically.
  • the functional unit (SVE) is operated hydraulically / pneumatically, but is mechanically locked intrinsically safe. No additional actuators necessary. Deletion of sliding gate / racks / springs /.
  • Absolute intrinsic safety is present; when unlocked is simultaneously bolted because of the mechanical logic.
  • the axis of the locking bolt is mounted eccentrically to Teleskopierzylinderl Kunststoffsachse because of space reduction.
  • the detection of the pin position is carried out directly by initiators on the processed switching edges on the backup cylinder and on the gripper.
  • the functional unit (SVE) can be mounted at any position in the longitudinal direction of the telescoping cylinder, but preferably at the beginning of the slidable part.
  • the securing and bolting unit consists of a lower housing part 1 and an upper housing part 2 fastened thereon.
  • the two locking pins 3 are slidably mounted, wherein the right and left bolts are connected by a piston rod 3a.
  • the belonging to the piston rod 3a piston, which is located in one of the bolts is not shown here.
  • the piston rod 3a has a smaller diameter than the securing bolts themselves.
  • the upper housing part 2 On the lower housing part 1, the upper housing part 2 is placed and in this a piston rod 4a is guided, which is an extension of the gripper 4. Relative to its longitudinal axis, the longitudinal axis of the piston rod 4a is eccentric and has a recess 4b at its free end.
  • the gripper 4 protrudes from the upper housing part 2.
  • the upper free end of the gripper 4 is - like the Figures 5-7 show - in the usual way with a locking pin 5 engageable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Actuator (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jigs For Machine Tools (AREA)

Description

Die Erfindung betrifft eine Sicherungs- und Verbolzungseinheit, für aus einem Grundelement teleskopierbaren Schüssen, insbesondere die Schüsse eines Teleskopauslegers eines Mobilkranes, umfassend zwei relativ zueinander verschiebbar angeordnete Sicherungsbolzen und einen mit einem Greifer zusammenwirkenden Verriegelungsbolzen.The invention relates to a securing and Verbolzungseinheit, for telescoping from a basic element shots, in particular the shots of a telescopic boom of a mobile crane, comprising two locking pins arranged relative to each other and a cooperating with a gripper locking bolt.

Aus der DE 198 24 672 A1 ist ein Kran mit einem Teleskopausleger bekannt, dessen in dem Grundausleger einzeln teleskopierbaren Schüsse nach dem Lösen von arretierenden Sicherungsbolzen mit einer Kolben-Zylinder-Einheit aus - und einfahrbar sind und in den jeweils aus- oder eingefahrenen Stellungen durch Verriegelungsbolzen verbolzbar sind.
Die Verriegelungsbolzen sind mit einem Greifer verbunden, der die Verbindung zum Antrieb herstellt.From the DE 198 24 672 A1 a crane with a telescopic boom is known, in the basic boom individually telescopic shots after releasing locking locking bolts with a piston-cylinder unit and are retractable and in the off or retracted positions are bolted by locking bolts.
The locking bolts are connected to a gripper, which connects to the drive.

Wie aus der DE 199 26 131 B4 ersichtlich, erfolgt die Betätigung der Sicherungsbolzen oft über einen Hebelmechanismus.Like from the DE 199 26 131 B4 As can be seen, the actuation of the safety bolts often takes place via a lever mechanism.

Derartige Sicherungs- und Verbolzungseinheiten, kurz SVE genannt, finden ihr Einsatzgebiet überall dort, wo Bauteile translatorisch bewegt werden müssen, hauptsächlich bei Mobilkranen mit einem Teleskopausleger, Baukranen mit Teleskopmast , Windkrafträdern, die einen teleskopierbaren Mast besitzen, Hubarbeitsbühnen, Fahrstühlen, Gabelstablern u.a.Such securing and bolting units, SVE for short, find their application anywhere where components must be moved translationally, mainly mobile cranes with a telescopic boom, cranes with telescopic mast, wind turbines, which have a telescopic mast, aerial work platforms, lifts, forklifts u.a.

Bisher bekannte Lösungen arbeiten - wie vorstehend beschrieben - immer mittelbar zum Ausführen der gewünschten Bolzenposition mit Hilfe von Zahnstangen oder Schiebekulissen und auch die Erfassung der Bolzenposition geschieht immer mittelbar. Daher wäre es denkbar, dass bei Bruch der Zahnstange oder Bruch der Schiebekulisse immer noch eine sichere Position des Verbolzungsbolzens über die Sensorik angezeigt wird.Previously known solutions work - as described above - always indirectly to carry out the desired bolt position by means of racks or Schiebekulissen and also the detection of the pin position is always done indirectly. Therefore, it would be conceivable that in case of breakage of the rack or breakage of the slide link still a safe position of the Verbolzungsbolzens on the sensors is displayed.

Die Schrift JP 2006 290 480 A offenbart eine Sicherungs- und Verbolzungseinheit nach dem Oberbegriff des Anspruchs 1.The font JP 2006 290 480 A discloses a securing and bolting unit according to the preamble of claim 1.

Aufgabe der Erfindung ist es, eine Sicherungs- und Verbolzungseinheit zu schaffen, die im Gegensatz zu bisherigen SVE's keine zwischengeschalteten Bauteile zwischen 'Auslöseelement' und 'Betätigungselement' besitzt. Dabei soll eine Reduzierung der Anzahl der Teile und eine Reduzierung des Gewichts und der Kosten der Bauteile erreicht werden.The object of the invention is to provide a security and Verbolzungseinheit, in contrast to previous SVE's no intermediate components between 'trigger element' and 'actuator' has. It should reduce the number the parts and a reduction in the weight and cost of the components can be achieved.

Das Ziel wäre somit das Weglassen der nicht benötigten Bauteile, wie Zahnstange, Schiebekulisse, Federelemente usw. Eine Verringerung der Teileanzahl (weniger Kosten, weniger Gewicht), sowie eine Möglichkeit für ein unmittelbares Abfragen der Bolzenposition. Hinzu käme die Möglichkeit zur Verringerung der Baugröße der SVE gegenüber vergleichbaren Lösungen; jedoch abhängig von der Belastung.The goal would therefore be to omit the unnecessary components such as rack, slide link, spring elements, etc. A reduction in the number of parts (less cost, less weight), as well as a possibility for an immediate query of the bolt position. Added to this would be the possibility of reducing the size of the SVE compared to comparable solutions; however, depending on the load.

Gelöst wird diese Aufgabe erfindungsgemäß mit einer Sicherungs- und Verbolzungseinheit, für aus einem Grundelement teleskopierbaren Schüssen, insbesondere die Schüsse eines Teleskopauslegers eines Mobilkranes, umfassend zwei relativ zueinander verschiebbar angeordnete Sicherungsbolzen und einen mit einem Greifer zusammenwirkenden Verriegelungsbolzen, wobei die Sicherungsbolzen und eine als Kolbenstange ausgebildete Verlängerung des Greifers gemeinsam in einem unteren Gehäuseteil senkrecht zueinander verschiebbar angeordnet sind dadurch gekennzeichnet, dass der Kolben für die Kolbenstange des Greifers sich in einem auf das untere Gehäuseteil aufgesetzten oberen Gehäuseteil befindet und dass die Sicherungsbolzen durch eine in dem einen Sicherungsbolzen geführte Kolbenstange relativ zueinander zusammen bzw. auseinander verschiebbar sind.This object is achieved according to the invention with a securing and Verbolzungseinheit, for a basic element telescopic shots, in particular the shots of a telescopic boom of a mobile crane, comprising two relatively displaceably arranged securing bolts and cooperating with a gripper locking bolt, wherein the safety pin and a piston rod designed Extension of the gripper together in a lower housing part arranged to be displaceable perpendicular to each other characterized in that the piston for the piston rod of the gripper is located in an upper housing part placed on the lower housing part and that the securing bolt by a guided in the one safety bolt piston rod relative to each other or are displaced apart.

Der Kern der erfindungsgemäßen Lösung besteht darin, dass das hydraulische Auslöseelement auch gleichzeitig mechanisches Betätigungselement ist, und damit der Wegfall von zwischengeschalteten Bauteilen (Schiebekulisse, Zahnstange, usw.) möglich ist.
Weitere Vorteile sind die absolute mechanische Eigensicherheit durch Wahl der Geometrie, keine hydraulische/elektrische Logik in Form von Ventilen/ Schaltern oder sonstigem zur Erlangung der Eigensicherheit.The essence of the solution according to the invention is that the hydraulic release element is at the same time mechanical actuator, and thus the elimination of intermediate components (sliding gate, rack, etc.) is possible.
Further advantages are the absolute mechanical intrinsic safety by choice of geometry, no hydraulic / electrical logic in the form of valves / switches or other to achieve intrinsic safety.

Damit kann ein Telesystem zur Verfügung gestellt werden, das bei mehreren Teleskopauslegern (großer Querschnitt bis sehr kleinem Querschnitt) wie bei einem Baukastenprinzip, verwendet werden kann.Thus, a telesystem can be made available, which can be used with several telescopic jibs (large cross-section to very small cross-section) as a modular principle.

Durch Exzentrizität, d. h. die Geomtrie des Greiferzylinders, kann der darunterliegende Sicherungszylinder nach beiden Seiten gleichlang ausgefahren werden.By eccentricity, ie the geometry of the gripper cylinder, the underlying backup cylinder can be extended to the same extent on both sides.

Die erfindungsgemäße Sicherungs- und Verbolzungseinheit besteht somit quasi nur noch aus 3 Bauteilen, und zwar dem Gehäuse, den Sicherungsbolzen (Sicherungszylinder), hydraulisch/ pneumatisch und dem Greifer (Verbolzungszylinder), hydraulisch/ pneumatisch.The securing and bolting unit according to the invention thus consists virtually only of 3 components, namely the housing, the safety bolt (safety cylinder), hydraulic / pneumatic and the gripper (Verbolzungszylinder), hydraulic / pneumatic.

Die Erfindung erlaubt die optimale Ausnutzung des zur Verfügung stehenden Bauraumes, da nur Bauteile eingesetzt werden, die auch den unmittelbaren Funktionen ( sichern, verbolzen) dienen. Der Greifer ist senkrecht zur Achse des Sicherungszylinders angeordnet. Die Ansteuerung der Funktionselemente kann hydraulisch oder pneumatisch erfolgen. Die Funktionseinheit (SVE) wird hydraulisch/ pneumatisch betätigt, ist jedoch mechanisch eigensicher verriegelt. Keine zusätzlichen Betätigungselemente notwendig.
Entfall von Schiebekulisse/ Zahnstangen/ Federn/.The invention allows the optimal utilization of the available space, since only components are used, which also serve the immediate functions (secure, bolted). The gripper is arranged perpendicular to the axis of the backup cylinder. The control of the functional elements can be done hydraulically or pneumatically. The functional unit (SVE) is operated hydraulically / pneumatically, but is mechanically locked intrinsically safe. No additional actuators necessary.
Deletion of sliding gate / racks / springs /.

Die Anzahl der notwendigen Bauteile wurde auf das nötigste begrenzt, d. h. auch die Zahl möglicher Fehlerquellen wurde auf ein Minimum reduziert.The number of necessary components has been limited to the most necessary, d. H. also the number of possible sources of error has been reduced to a minimum.

Absolute Eigensicherheit ist vorhanden; wenn entsichert ist, ist wegen der mechanischen Logik gleichzeitig verbolzt. - Die Achse des Sicherungsbolzens ist zu Teleskopierzylinderlängsachse wegen Bauraumreduzierung außermittig angebracht. - Die Erfassung der Bolzenstellung erfolgt unmittelbar durch Initiatoren an angearbeiteten Schaltkanten an dem Sicherungszylinder und an den Greifer.Absolute intrinsic safety is present; when unlocked is simultaneously bolted because of the mechanical logic. - The axis of the locking bolt is mounted eccentrically to Teleskopierzylinderlängsachse because of space reduction. - The detection of the pin position is carried out directly by initiators on the processed switching edges on the backup cylinder and on the gripper.

Es sind nur jeweils 2 hydraulische/ pneumatische Zuleitungen an den Sicherungszylinder bzw. an das Gehäuseoberteil notwendig.Only 2 hydraulic / pneumatic supply lines to the locking cylinder or to the upper housing part are necessary.

Es ist keine keine hydraulische Logik erforderlich. - Die Funktionseinheit (SVE) kann an irgendeiner Position in Längsrichtung des Teleskopierzylinders angebracht werden, jedoch vorzugsweise am Anfang des schiebbaren Teiles.No hydraulic logic is required. The functional unit (SVE) can be mounted at any position in the longitudinal direction of the telescoping cylinder, but preferably at the beginning of the slidable part.

Die Erfindung soll nachfolgend mit Bezug auf die Zeichnungen erläutert werden.The invention will be explained below with reference to the drawings.

Dabei zeigt:Showing:

Fig. 1Fig. 1
die einzelnen Bauteile der Sicherungs- und Verbolzungseinheit,the individual components of the securing and bolting unit,
Fig. 2-4Fig. 2-4
die einzelnen Positionen des Greifers bzw. der Sicherungsbolzen und diethe individual positions of the gripper or the safety bolt and the
Fig. 5-7Fig. 5-7
die entsprechenden Darstellungen, jedoch im Querschnitt der Schüsse gesehen.the corresponding representations, but seen in the cross section of the shots.

Die erfindungsgemäße Sicherungs- und Verbolzungseinheit besteht aus einem unteren Gehäuseteil 1 und einem darauf befestigten oberen Gehäuseteil 2.
Im unteren Gehäuseteil 1 sind die beiden Sicherungsbolzen 3 verschiebbar gelagert, wobei der rechte und der linke Bolzen durch eine Kolbenstange 3a verbunden sind. Der zu der Kolbenstange 3a gehörige Kolben, der sich in einem der Bolzen befindet, ist hier nicht dargestellt.
Durch diese Anordnung können die beiden Sicherungsbolzen relativ zueinander auseinander bzw. zusammen geschoben werden.
Die Kolbenstange 3a weist - wie aus der Zeichnung ersichtlich - einen geringeren Durchmesser auf als die Sicherungsbolzen selbst.The securing and bolting unit according to the invention consists of a lower housing part 1 and an upper housing part 2 fastened thereon.
In the lower housing part 1, the two locking pins 3 are slidably mounted, wherein the right and left bolts are connected by a piston rod 3a. The belonging to the piston rod 3a piston, which is located in one of the bolts is not shown here.
By this arrangement, the two securing bolts can be pushed apart or together relative to each other.
As can be seen from the drawing, the piston rod 3a has a smaller diameter than the securing bolts themselves.

Auf das untere Gehäuseteil 1 ist das obere Gehäuseteil 2 aufgesetzt und in diesem ist eine Kolbenstange 4a geführt, die eine Verlängerung des Greifers 4 darstellt. Bezogen auf dessen Längsachse ist die Längsachse der Kolbenstange 4a exzentrisch und weist an ihrem freien Ende eine Ausnehmung 4b auf. Der Greifer 4 ragt aus dem oberen Gehäuseteil 2 heraus .
Das obere freie Ende des Greifers 4 ist - wie die Figuren 5-7 zeigen - in üblicher Weise mit einem Verriegelungsbolzen 5 in Eingriff bringbar.On the lower housing part 1, the upper housing part 2 is placed and in this a piston rod 4a is guided, which is an extension of the gripper 4. Relative to its longitudinal axis, the longitudinal axis of the piston rod 4a is eccentric and has a recess 4b at its free end. The gripper 4 protrudes from the upper housing part 2.
The upper free end of the gripper 4 is - like the Figures 5-7 show - in the usual way with a locking pin 5 engageable.

Wie die Figuren 2-4 zeigen, sind die Abmessungen des unteren Teiles der Kolbenstange des Greifers mit der Ausnehmung 4b, die Kolbenstange 3a und der Abstand der Sicherungsbolzen 3, wenn sie auseinander geschoben sind, so bemessen, dass die Kolbenstange 4a mit der Ausnehmung 4b in den Zwischenraum zwischen den Sicherungsbolzen abgesenkt werden kann und dabei die Kolbenstange 3a teilweise umfasst.As the Figures 2-4 show, the dimensions of the lower part of the piston rod of the gripper with the recess 4b, the piston rod 3a and the distance of the securing bolt 3, when they are pushed apart, so dimensioned that the piston rod 4a with the recess 4b in the space between the securing bolt can be lowered while the piston rod 3a partially covers.

In dieser abgesenkten Position hat der Greifer 4 den mit ihm verbundenen Verriegelungsbolzen 5 entriegelt, wie dies die Figuren 4 und 7 zeigen.In this lowered position, the gripper 4 has unlocked the associated locking bolt 5, as the FIGS. 4 and 7 demonstrate.

Somit ergeben sich die in den Figuren 2-4 bzw. 5-7 dargestellten Zustände, und zwar die entsicherte Stellung der Sicherungsbolzen 3 bei verbolzter Position des Verriegelungsbolzens 5 (Fig. 2 und Fig. 5), die gesicherte Position der Sicherungsbolzen 3 und die verbolzte Position des Verriegelungsbolzens 5 (Fig. 3 und Fig. 6) und die gesicherte Postion der Sicherungsbolzen 3, bei entbolzter Postion des Verriegelungsbolzens 5 (Fig. 4 und Fig. 7).Thus, the result in the Figures 2-4 or 5-7 illustrated states, namely the unlocked position of the securing bolt 3 in bolted position of the locking bolt 5 Fig. 2 and Fig. 5 ), the secured position of the securing bolt 3 and the bolted position of the locking bolt 5 (FIG. Fig. 3 and Fig. 6 ) and the secured Position of the securing bolt 3, with unbolted position of the locking bolt 5 ( Fig. 4 and Fig. 7 ).

In den Figuren 5 bis 7 sind die Schüsse des Teleskopauslegers mit 6 und 7 bezeichnet.In the FIGS. 5 to 7 the shots of the telescopic boom are denoted by 6 and 7.

Claims (4)

  1. A securing and bolting unit, for sections which can be telescoped out of a basic element, in particular the sections of a telescopic boom of a mobile crane, comprising two securing bolts (3) arranged displaceably relative to one another and a locking bolt (5) which cooperates with a gripper (4),
    wherein the securing bolts (3) and an extension of the gripper (4) which is formed as a piston rod (4a) are arranged together in a lower housing part (1) so as to be displaceable perpendicularly relative to each other,
    characterised in that
    the piston (8) for the piston rod (4a) of the gripper (4) is located in an upper housing part (2) placed on the lower housing part (1) and
    in that the securing bolts (3) are displaceable towards each other or apart from each other by a piston rod (3a) which is guided in the one securing bolt.
  2. A securing and bolting unit according to Claim 1, characterised in that the piston rod (4a) which is formed as an extension of the gripper (4) runs eccentrically to the gripper axis and has at its free end a cutout (4b) with which, encompassing the piston rod (3a) of the pushed-apart securing bolts (3), it can be lowered between them in order to unlock the locking bolt (5).
  3. A securing and bolting unit according to one of the preceding claims, characterised in that the piston is controlled hydraulically or pneumatically.
  4. A securing and bolting unit according to one of the preceding claims, characterised in that the bolt position is detected directly by proximity switches through machined-on switching edges on the securing bolts (3) and on the gripper (4).
EP20100075033 2009-02-20 2010-01-21 Securing and bolting unit Active EP2221270B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910009944 DE102009009944B4 (en) 2009-02-20 2009-02-20 Securing and bolting unit

Publications (3)

Publication Number Publication Date
EP2221270A2 EP2221270A2 (en) 2010-08-25
EP2221270A3 EP2221270A3 (en) 2012-03-21
EP2221270B1 true EP2221270B1 (en) 2014-03-12

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US (1) US9090438B2 (en)
EP (1) EP2221270B1 (en)
CN (1) CN101817480B (en)
DE (1) DE102009009944B4 (en)
ES (1) ES2470685T3 (en)

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DE102013011173B4 (en) * 2013-07-04 2019-05-23 Liebherr-Werk Ehingen Gmbh Method for assembling a crane as well as articulation, telescopic boom and crane
JP6223071B2 (en) * 2013-08-30 2017-11-01 株式会社タダノ Boom telescopic mechanism of crane equipment
US10647552B1 (en) * 2015-09-25 2020-05-12 Link-Belt Cranes, L.P., Lllp Fly connection system for a crane boom
JP6787392B2 (en) * 2016-03-03 2020-11-18 株式会社タダノ Telescopic mechanism
EP3448795B1 (en) * 2016-04-25 2023-07-26 Manitowoc Crane Companies, LLC Crane with rotary locking mechanism
EP3578500B1 (en) * 2018-06-04 2022-07-20 Manitowoc Crane Companies, LLC Telescoping boom with rotary extension and locking system
CA3101208C (en) * 2018-06-05 2023-10-17 The Will-Burt Company Auto-locking telescoping mast

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Also Published As

Publication number Publication date
CN101817480B (en) 2014-01-08
US9090438B2 (en) 2015-07-28
US20100213154A1 (en) 2010-08-26
EP2221270A2 (en) 2010-08-25
CN101817480A (en) 2010-09-01
DE102009009944A1 (en) 2010-09-02
EP2221270A3 (en) 2012-03-21
DE102009009944B4 (en) 2011-02-24
ES2470685T3 (en) 2014-06-24

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