EP2062844A1 - Bras de liaison rétractile dans un agencement de palonnier côte à côte - Google Patents

Bras de liaison rétractile dans un agencement de palonnier côte à côte Download PDF

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Publication number
EP2062844A1
EP2062844A1 EP07121137A EP07121137A EP2062844A1 EP 2062844 A1 EP2062844 A1 EP 2062844A1 EP 07121137 A EP07121137 A EP 07121137A EP 07121137 A EP07121137 A EP 07121137A EP 2062844 A1 EP2062844 A1 EP 2062844A1
Authority
EP
European Patent Office
Prior art keywords
arm
spreader
arm member
arrangement
release mechanism
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.)
Withdrawn
Application number
EP07121137A
Other languages
German (de)
English (en)
Inventor
Sven Kindblom
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.)
Bromma Conquip AB
Original Assignee
Bromma Conquip AB
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
Application filed by Bromma Conquip AB filed Critical Bromma Conquip AB
Priority to EP07121137A priority Critical patent/EP2062844A1/fr
Publication of EP2062844A1 publication Critical patent/EP2062844A1/fr
Withdrawn legal-status Critical Current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
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/101—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means for containers
    • B66C1/104—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means for containers for two or more containers side by side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/62—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled
    • B66C1/66—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof
    • B66C1/663—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
    • B66C19/002—Container cranes

Definitions

  • the present invention relates to arrangements on spreaders, and more specifically to connecting arms arranged for interconnection of spreaders that are operated side by side in lift operations.
  • the expression "spreader” refers to a structure adapted for shifting containers from one location to another.
  • the spreader is adapted for lifting and lowering operations driven by a crane from which the spreader is suspended in ropes .
  • the ropes are guided in rope sheaves to run from a crane drive to the spreader, via a trolley that is movable on rails in the upper crane structure.
  • the ropes attach to the spreader through rope sheaves which are journalled in the upper side of the spreader.
  • the lower side of the spreader includes coupling means for coupling the spreader to corner casings arranged on a container to be shifted.
  • the coupling means may be supported from frames or beam structures that can be detachably coupled to a spreader head-block, in which the rope sheaves are journalled.
  • a spreader head-block in which the rope sheaves are journalled.
  • the expression spreader shall thus be understood to encompass the separate head-block, or if appropriate, the head-block and coupling structures in combination.
  • the literature contains several examples of spreaders that are interconnectable side by side in lift operations, i.e. shifting operations wherein two or more containers are handled simultaneously by spreaders that are interconnected side by side.
  • the connecting means between the spreaders are typically realized as arms, which are journalled in both spreaders for some degree of movement in order to compensate for un-parallelism between the spreaders.
  • the arms are typically hydraulically powered to permit a control of the relative position of spreaders and associated containers during shifting operations.
  • the connecting arms may be telescopically extendable, such as exemplified in US 2006/0243724 A1 , or hinged as exemplified in WO 03/104132 .
  • the ability to accommodate for spatial separation of the spreaders is of course limited, and in case of a non-admissible separation, there is a risk that the arms or connecting structures and journals get damaged.
  • the risk for damage is at the largest during lift and lowering into the load compartment of a ship, wherein non-admissible vertical separation of the spreaders may result if one of the spreaders, or its associated container, gets jammed in vertical lowering guides while the other is free to move in the adjacent lowering guides.
  • the present invention aims at avoiding the risk of damages to the connecting structures between interconnected spreaders, such as damages resulting from collision in case of incidental non-admissible vertical separation of the spreaders when operated side by side in lift operations.
  • an extendable connecting arm is connected to the first spreader and in its free end connectable to the second spreader, said connecting end being movably journalled in the second spreader in the connected position.
  • a release mechanism is arranged on the connecting arm and activated in result of a non-admissible vertical separation between the spreaders, whereby the release mechanism effectuates retraction of the connecting arm from said second spreader.
  • the connecting arm is biased towards a retracted condition
  • the release mechanism upon release and disconnection from the second spreader, is arranged to activate a biased retraction of the connecting arm from the second spreader.
  • the release mechanism is further arranged on an outer arm member of a telescopic arm, said arm member being spring biased to the telescopic arm, wherein the release mechanism is arranged to release the spring for retraction of the arm member into the telescopic arm.
  • the release mechanism further comprises a trigger arranged adjacent the end of the arm member, which trigger is acted upon from a limiter arranged on the second spreader.
  • the location of the limiter on the second spreader determines a maximum length of admissible vertical separation between the first and second spreaders under which the spreaders remain connected.
  • the outer end carries a connector that is arranged in connecting position to move in the length direction of an elongate guide which is vertically oriented on the second spreader.
  • the arm may be arranged to have a part-spherical connector member carried in the connecting end of the arm, the connector being insertable to move in the length direction of a tubular seat of semicircular cross-sectional shape, which seat is vertically oriented on the second spreader.
  • the limiter is preferably arranged adjacent to a lower end of the seat.
  • the limiter may be shaped as a cam and the trigger may be shaped as a cam follower.
  • the release mechanism comprises a link mechanism journalled inside a hollow arm section; a trigger pivotally projecting outside the arm section and connected to the link mechanism, and a latch pivotally projecting outside the arm section and connected to the link mechanism, such that pivoting of the trigger effects pivoting of the latch.
  • the latch is arranged to engage the front end of an end plate to the telescopic arm, through which end plate the arm's arm member projects with an inner end into the telescopic arm, wherein a coil spring supported about said arm member in one end is fixed adjacent to a rear and inner end of the arm member, while the other end of the coil spring acts upon a rear end of the end plate.
  • the arm member can be hydraulically activated for compression of the coil spring into a biased condition, wherein the latch again engages the front end of the end plate.
  • a hydraulically operated actuator is incorporated in the telescopic arm.
  • horizontal refers to a planar horizontal projection of a spreader
  • vertical refers to any normal to the horizontal projection
  • a first and a second spreader 1, 2 are shown in side by side lift operation.
  • the spreaders 1, 2 are each suspended in ropes 3 from a rope crane (not shown) and operated for shifting containers from one location to another.
  • the ropes connect to an upper end of a spreader, typically via rope sheaves 4 which are rotatably journalled in a head-block comprised in the spreader structure.
  • twist locks 5 are supported and operative as connecting means for connection and disconnection, respectively, of spreaders and containers.
  • one of the spreaders is inactive.
  • the first and second spreaders are together operated in lifting/lowering and shifting operations.
  • first and second spreaders are detachably interconnected by means of a connecting arm 10. More precisely, a pair of connecting arms 10 are typically provided and separated by a distance in the longitudinal extension of the spreader.
  • the connecting arm 10 is attached to the first spreader, from which the connecting arm is telescopically extendable towards the second spreader.
  • the connecting arm 10 is further pivotally attached to the first spreader in the horizontal plane.
  • Extension/retraction and pivoting may be realized through hydraulic actuators as is common technology.
  • the actuators are remotely controllable by the crane operator for connection/disconnection and for adjustment of the relative position of interconnected spreaders.
  • the connecting arms 10 are operated by the actuators for connection to the second spreader. In connected mode, the connecting arms are operable by the actuators for control of the spatial relation between the first and second spreaders.
  • the connecting arms are effective for controlling the mutual relation between the spreaders, to a limited extent, also when the spreaders are positioned in vertically separate planes.
  • an extreme arm member 11 is arranged retractable into the connecting arm 10.
  • a connector 12 in the outermost end of arm member 11 is detachably connectable to the second spreader.
  • the connector 12 engages a guide or seat 13 arranged on the second spreader.
  • the seat 13 forms an elongate, tubular guide running in vertical direction from an upper end 14 to a lower end 15.
  • the connector 12 of arm member 11 is insertable via the upper end of the seat 13, to which purpose the seat may have a radially widened upper end as illustrated.
  • the connector 12 is received movable in the seat between the upper and lower ends to accommodate for vertical relative movements between the first and second spreaders in connected mode.
  • the seat 13 has a circular, or to be more specific, a semi-circular cross-sectional shape in the horizontal plane.
  • the connector 12 is preferably part-spherical.
  • the arm member 11 reaches out from the seat 13 via a longitudinal opening 16 running between the upper end lower ends of the seat 13.
  • a horizontal width of the opening 16 is oversized with respect to the width of a corresponding portion of the arm member 11, permitting the same a certain degree of horizontal pivoting in the interconnected position. Additionally and preferred, a certain degree of pivotal relative movements also in vertical planes is achievable when the connector 12 is made spherical, or part-spherical.
  • the length of the seat 13 corresponds to an admissible vertical separation between the interconnected spreaders, during which the connecting arm 10 is operable for controlling the relative position of the spreaders in horizontal planes.
  • a release mechanism arranged on the connecting arm 10 automatically effectuates disconnection of the spreaders, as will be further explained below.
  • a link member 17 Arranged in the hollow arm member 11 is a link member 17 comprised in the release mechanism.
  • a forward end of the link 17 is pivotally connected to a trigger 18, the trigger 18 in turn pivotally supported in the arm member 11 so as to project on the outside of the connecting arm, near the extreme end of the arm and adjacent to the connector 12.
  • a rear end of the link 17 is pivotally connected to a latch 19, the latch 19 in turn pivotally supported in the arm member 11 so as to project on the outside of the connecting arm. Pivoting of the trigger 18 is thus transferred to the latch 19 via the link 17, obviously causing a corresponding pivoting of the latch.
  • the latch 19 engages a front end of an end plate 20 to a telescope section 21 of the connecting arm 10.
  • the end plate 20 has a through-hole through which a rear end of the arm member 11 projects into the telescope section 21.
  • a coiled spring 22 is supported about the rear and inner end of the arm member 11.
  • One end of the coil spring 22 is fixedly attached in the rear end of the arm member, the opposite other end of the coil spring acting upon the rear end of end plate 20.
  • the coil spring 22 In the locking condition the coil spring 22 is compressed, biasing the arm member 11 towards a retracted position in the telescope section 21. Pivoting of the trigger 18 thus causes the latch 19 to pivot out of engagement with the end plate 20, thereby releasing the arm member 11 to be retracted into the telescope section 21 by action of the expanding coil spring 22.
  • Fig. 3 shows the arrangement and release mechanism in disconnecting mode, as the arm member 11 is about to be retracted into the telescope section 21 of the connecting arm 10.
  • the fully retracted position is illustrated in fig. 4 .
  • Release is initiated in result of the trigger 18 being pivoted and actuated upon from engagement with a limiter 23 arranged on the second spreader 2.
  • the limiter 23 comprises a cam surface projecting into the path of movement for the trigger, as the connecting arm 10 travels towards the lower end of the seat 13 in a vertical relative movement of the two spreaders.
  • the limiter 23 is arranged adjacent to the lower end of the seat, in practise by its position limiting the length of admissible vertical movement of the connector 12 along the guide/seat 13, and thus also limiting the admissible vertical separation between the spreaders in interconnected mode.
  • the trigger 18 travels like a cam follower over a cam surface on the limiter 23.
  • the limiter thus causes the trigger 18 to pivot and to disengage the latch 19 from the end plate 20.
  • the arm member 11 is instantly retracted into the telescope section 21, eliminating the risk of collision between the connecting arm and the passing container in case of an uncontrolled vertical separation of the spreaders.
  • the release mechanism may be reset into connecting condition through an actuator 24 comprised in the connecting arm 10.
  • the actuator 24 effectuates extension of the arm member 11, against the force of the biasing spring 22, till the latch 19 again engages the front end of end plate 20.
  • the actuator 24 is stationary with respect to an outer telescope section 25, in which the telescope section 21 is journalled for extension and retraction.
  • the rear end of the arm member 11 In its fully retracted position of fig. 4 , the rear end of the arm member 11 is positioned near to a front end of the actuator 24, which projects into the telescope section 21 via the rear end thereof.
  • the telescopic action is driven and controlled by means of a hydraulic cylinder 26.
  • the telescope section 21 is retracted into the actuator 24 which then acts on the rear end of arm member 11, as illustrated in fig. 5 .
  • the actuator 24 acts upon a rear end of a link member 27 which is comprised in the hollow interior of arm member 11.
  • the opposite forward end of link member 27 is pivotally connected to a ratchet 28 which is pivotally supported in the arm member 11.
  • the ratchet 28 is effective for holding the disengaged latch 19 radially inside the periphery of the arm member 11 in retraction, out of way for the expanding coil spring 22.
  • the ratchet 28 is pivoted in result of the actuator 24 acting upon the rear end of link member 27.
  • the latch 19 is released from the ratchet and allowed to project outside the arm member 11 to engage again the front end of end plate 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP07121137A 2007-11-20 2007-11-20 Bras de liaison rétractile dans un agencement de palonnier côte à côte Withdrawn EP2062844A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07121137A EP2062844A1 (fr) 2007-11-20 2007-11-20 Bras de liaison rétractile dans un agencement de palonnier côte à côte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07121137A EP2062844A1 (fr) 2007-11-20 2007-11-20 Bras de liaison rétractile dans un agencement de palonnier côte à côte

Publications (1)

Publication Number Publication Date
EP2062844A1 true EP2062844A1 (fr) 2009-05-27

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ID=39284081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121137A Withdrawn EP2062844A1 (fr) 2007-11-20 2007-11-20 Bras de liaison rétractile dans un agencement de palonnier côte à côte

Country Status (1)

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EP (1) EP2062844A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1938116A1 (de) * 1969-07-26 1971-02-04 Demag Ag Vorrichtung zum Aufnehmen,Transportieren und Absetzen von mindestens zwei Frachtbehaeltern
GB1302245A (fr) * 1970-02-23 1973-01-04
US3747970A (en) * 1972-01-17 1973-07-24 Midland Ross Corp Container-spreader spacing apparatus
US20060243724A1 (en) * 2003-07-30 2006-11-02 Jianguo Shan Container lifter being able to lift two 40 feet containers
WO2007136352A1 (fr) * 2006-05-22 2007-11-29 Nsl Engineering Pte Ltd Dispositif d'écartement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1938116A1 (de) * 1969-07-26 1971-02-04 Demag Ag Vorrichtung zum Aufnehmen,Transportieren und Absetzen von mindestens zwei Frachtbehaeltern
GB1302245A (fr) * 1970-02-23 1973-01-04
US3747970A (en) * 1972-01-17 1973-07-24 Midland Ross Corp Container-spreader spacing apparatus
US20060243724A1 (en) * 2003-07-30 2006-11-02 Jianguo Shan Container lifter being able to lift two 40 feet containers
WO2007136352A1 (fr) * 2006-05-22 2007-11-29 Nsl Engineering Pte Ltd Dispositif d'écartement

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