EP0767135A1 - Vorrichtung zur Steuerung und Vorwahl der Ausschiebung der individuellen Schübe des Teleskopmasts eines Krans oder dergleichen - Google Patents

Vorrichtung zur Steuerung und Vorwahl der Ausschiebung der individuellen Schübe des Teleskopmasts eines Krans oder dergleichen Download PDF

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Publication number
EP0767135A1
EP0767135A1 EP96830460A EP96830460A EP0767135A1 EP 0767135 A1 EP0767135 A1 EP 0767135A1 EP 96830460 A EP96830460 A EP 96830460A EP 96830460 A EP96830460 A EP 96830460A EP 0767135 A1 EP0767135 A1 EP 0767135A1
Authority
EP
European Patent Office
Prior art keywords
extraction
jib
controlling
selecting
rope
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Withdrawn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
EP96830460A
Other languages
English (en)
French (fr)
Inventor
Leoni Silvano
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.)
Autogru Rigo SpA
Original Assignee
Autogru Rigo SpA
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 Autogru Rigo SpA filed Critical Autogru Rigo SpA
Publication of EP0767135A1 publication Critical patent/EP0767135A1/de
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present disclosure relates to a system which permits both a control and a pre-selection of the extension or going-out of the single component sections of a telescopic jib of a crane truck or the like.
  • crane trucks As it is well-known, there is a wide variety of lifting apparatuses including self-propelled apparatuses such as the so-called crane trucks.
  • the crane trucks can be used in various places of intervention where it is necessary to lift loads.
  • Such crane trucks are carried out by coupling a road vehicle showing appropriate dimensions and a movable jib.
  • the jib is extensible like a telescope.
  • a hook controlled by a winch is arranged on the free end of the jib.
  • the crane jib consists usually of four or five telescopic elements of which three or four telescopic elements are movable.
  • the extension or going-out of such telescopic parts is permitted by double-acting hydraulic jacks and rope transmissions. In such a way it is possible to extend the jib itself until its end provided with the hook reaches the vertical of the operative position.
  • the extracting operations or "jib configurations" can be easily performed. Such configurations represent the various lengths which can be reached by the jib itself with a suitable extraction or return of its components, also in a not sequential manner, in order to obtain the best performances for the crane truck.
  • the jib configurations permit to reach quite limited capacities above all owing to the fact that the extraction of the larger sections for lifting heavier loads can be done only by using the smaller sections of the inner telescopic jack since the arrangement of the sections of the jack is inverse to the arrangement of the sections of the jib.
  • the extension of the jib begins necessarily with the extraction of the larger sections and goes on with the progressive, proportional extraction of the smaller sections until the jib reaches its longest extension, which involves a considerable limitation of the forces to be used in the thrust phases.
  • an inadequate jib capacity is reached in the known solutions.
  • the aim of the present invention consists in conceiving and carrying out a system which comprises suitable mechanisms for releasing the extraction ropes of the jib, which system permits to rationalize and control an independent intervention of the single sections and to obtain considerable increases in the capacity in comparison with the conventional solutions, even 60%, with certain configurations of the jib.
  • the present invention refers to a system for controlling and pre-selecting the extension of the single sections forming a telescopic jib of a crane truck or the like, the said jib being provided with a hydraulic double-acting jack and rope transmissions, the rope transmissions being arranged between the jack and the sections forming the jib, characterized by the fact that the respective anchorage points for the ropes are arranged on retaining elements which are interested by the intervention of devices permitting the hydraulic release and that the anchorage points, made free, in case of the external rope, can leaned on a suitable support arranged on the top of the penultimate section so that the length of the external rope itself corresponding to the stroke of the section is recovered when the last section re-enters whereas in case of the internal rope, the respective anchorage element can slide along a suitable slide which is provided on the extraction jack.
  • in general number 1 denotes an operative jib of a crane truck or the like for lifting loads.
  • This jib according to the present example comprises five telescopic elements or sections 2, 3, 4, 5 and 6, the more external four telescopic elements being movable.
  • the telescopic base element or section 2 is fixed to a revolving-turret while the more external telescopic element 6 comprises the jib head and the respective transmission parts of the lifting hook.
  • the various telescopic elements 3-6 are extensible outwards through particular extraction procedures which are accomplished by means of double-acting telescopic cylinders indicated in general with number 7, which cylinders are arranged within the jib 1, and suitable ropes 8 are arranged on transmission pulleys 8' both within the jib and out of the jib between the penultimate section 5 and the last telescopic element or section 6 supporting the head.
  • the extraction of the sections may be proportional in case each rope remains attached to its own support. Otherwise it is possible to exclude from the extraction the sections which do not interest a given configuration beginning from the last element supporting the head by using the new mechanisms according to the present invention, the said configuration being represented by the position of the sections in respect to their respective total strokes.
  • the exclusion of the sections that are not to be used from the extraction is determined by the hydraulic release or the like of the unit 10. More precisely, such an exclusion is caused by releasing pivots 11 (Fig. 8) which fix the hooking or anchoring points 9 of the extraction ropes 8.
  • the anchoring point for the external rope is a saddle 12 (Fig. 5) supporting the rope itself, whereas the anchoring point for the internal rope is a mechanical element 10 which is provided with a passing pivot on which the terminal part of the internal extraction rope is fixed.
  • the saddle 12 made free remains leaned on a suitable support placed on the top of the penultimate section is such a way that the length of the external rope equal to the stroke of the section is recovered when the last section re-enters.
  • the inner mechanical element made free may slide along a suitable slide arranged on the extraction jack.
  • the above described releasing mechanisms permit to obtain a proportional extraction of more sections through an only stroke of the jack and it is possible to choose the section to be extracted beginning from the sector supporting the head.
  • the present invention has reached the fundamental aim to take advantage of the extraction power of the jack which is made available by the release of the unused sections. In this way it is possible to sensibly increase the capacities, i.e. the weight of the loads to be lifted, in the middle-low ranges of work under the same jib lengths obtainable by combining various configurations.
  • the above described hydraulic locking and releasing devices may be replaced by electric or pneumatic devices or the like having the same purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Control And Safety Of Cranes (AREA)
EP96830460A 1995-10-03 1996-09-02 Vorrichtung zur Steuerung und Vorwahl der Ausschiebung der individuellen Schübe des Teleskopmasts eines Krans oder dergleichen Withdrawn EP0767135A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR950053U 1995-10-03
IT000053 IT239349Y1 (it) 1995-10-03 1995-10-03 Sistema atto a controllare e preselezionare l'estensione delle singolesezioni componenti il braccio telescopico di autogru o similari

Publications (1)

Publication Number Publication Date
EP0767135A1 true EP0767135A1 (de) 1997-04-09

Family

ID=11428034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830460A Withdrawn EP0767135A1 (de) 1995-10-03 1996-09-02 Vorrichtung zur Steuerung und Vorwahl der Ausschiebung der individuellen Schübe des Teleskopmasts eines Krans oder dergleichen

Country Status (2)

Country Link
EP (1) EP0767135A1 (de)
IT (1) IT239349Y1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046652A1 (de) * 1969-10-03 1971-04-15 Eisengiesserei U Maschinenfabr Teleskopausleger
FR2370676A1 (fr) * 1976-11-11 1978-06-09 Coles Cranes Ltd Fleche de grue ou mat de charge telescopique
FR2681649A1 (fr) * 1991-09-24 1993-03-26 Krupp Industrietech Systeme de telescopage hydromecanique, notamment pour grue automobile.
EP0621229A1 (de) * 1993-04-10 1994-10-26 Fried. Krupp AG Hoesch-Krupp Teleskopauslegerkran
FR2708584A1 (fr) * 1993-08-06 1995-02-10 Ppm Dispositif de commande sélective du déplacement simultané ou télescopique synchronisé de deux éléments constitutifs d'une flèche télescopique de grue.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2046652A1 (de) * 1969-10-03 1971-04-15 Eisengiesserei U Maschinenfabr Teleskopausleger
FR2370676A1 (fr) * 1976-11-11 1978-06-09 Coles Cranes Ltd Fleche de grue ou mat de charge telescopique
FR2681649A1 (fr) * 1991-09-24 1993-03-26 Krupp Industrietech Systeme de telescopage hydromecanique, notamment pour grue automobile.
EP0621229A1 (de) * 1993-04-10 1994-10-26 Fried. Krupp AG Hoesch-Krupp Teleskopauslegerkran
FR2708584A1 (fr) * 1993-08-06 1995-02-10 Ppm Dispositif de commande sélective du déplacement simultané ou télescopique synchronisé de deux éléments constitutifs d'une flèche télescopique de grue.

Also Published As

Publication number Publication date
ITVR950053V0 (it) 1995-10-03
ITVR950053U1 (it) 1997-04-03
IT239349Y1 (it) 2001-02-26

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