EP1134178A2 - Endlagestoppvorrichtung für Hebekräne, insbesondere Kräne mit teleskopischen Auslegern - Google Patents

Endlagestoppvorrichtung für Hebekräne, insbesondere Kräne mit teleskopischen Auslegern Download PDF

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Publication number
EP1134178A2
EP1134178A2 EP01105315A EP01105315A EP1134178A2 EP 1134178 A2 EP1134178 A2 EP 1134178A2 EP 01105315 A EP01105315 A EP 01105315A EP 01105315 A EP01105315 A EP 01105315A EP 1134178 A2 EP1134178 A2 EP 1134178A2
Authority
EP
European Patent Office
Prior art keywords
lifting
cable
cranes
pulley
limit stop
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Withdrawn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
EP01105315A
Other languages
English (en)
French (fr)
Other versions
EP1134178A3 (de
Inventor
Achille Guidorossi
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.)
FASSI GRU IDRAULICHE SpA
Original Assignee
FASSI GRU IDRAULICHE 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 FASSI GRU IDRAULICHE SpA filed Critical FASSI GRU IDRAULICHE SpA
Publication of EP1134178A2 publication Critical patent/EP1134178A2/de
Publication of EP1134178A3 publication Critical patent/EP1134178A3/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Withdrawn legal-status Critical Current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
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
    • 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
    • B66C23/66—Outer or upper end constructions

Definitions

  • the present invention relates to a limit stop device for lifting cranes, particularly cranes with telescopic arms.
  • the invention relates to cranes which comprise a base column to which a first rigid arm is articulated, the arm being controlled by a corresponding first hydraulic jack adapted to produce its oscillation with respect to said column, and in which said first arm typically has a second arm articulated thereto, the second arm comprising telescopic portions and being likewise controlled by a corresponding second hydraulic jack which is adapted to produce its oscillation with respect to the first one and includes additional hydraulic jacks which cause the extension and retraction of the telescopic portions.
  • Cranes of this type typically used to equip trucks and transport vehicles in general, can use a cable, provided with a lifting hook, which is pulled by a winch being supported by the arm with telescopic portions, termed telescopic arm for the sake of brevity, and is guided by a pulley being carried at the free end of the outermost portion of the arm, considered in its fully extended configuration.
  • the lifting cable is moderately tensioned and the lifting hook is made to abut against a mechanical retention element, known as limit stop, which is designed to keep the hook in a stable inactive position.
  • a fork oscillatably coupled to the pivot of the guiding pulley, has a flat bracket articulated thereto; the suspension cable passes through the bracket and the lifting hook abuts against the bracket, which is provided with a reaction slider which engages, by way of its active surfaces, the pulley, onto which it discharges the stress produced by the abutment contact of the lifting hook.
  • the surface of the flat bracket that acts as abutment for the supporting surface of the lifting hook is arranged substantially at right angles to the cable, at least for angular positions of the telescopic arm which are not very far from the horizontal one.
  • This is designed to prevent, or at least reduce, the onset of torques which tend to turn the assembly constituted by the fork, the bracket and the reaction slider about the pivot of the pulley and to prevent the bracket from assuming an angle other than 90° with respect to the cable, which in this case would be subjected to excessive stress.
  • the aim of the present invention is to eliminate them, and within the scope of this aim the important particular object of the invention is to provide a limit stop device which can ensure the correct engagement of the lifting hook by way of its abutment portion and the consequent correct application of stress to the cable regardless of the relative angular position of the arms of the crane, accordingly avoiding the disengagement of the hook from the limit stop even in the presence of considerable tensions applied to the cable by unintentional and accidental extensions of the telescopic arm of said crane.
  • Another important object of the present invention is to provide a limit stop device which has an extremely simplified structure and in particular does not have mutually connected and/or articulated elements and therefore ensures absolute reliability in operation and no need for maintenance.
  • the invention is based on the concept of accommodating the pulley for guiding the lifting cable inside a rigid housing which has, at one end, a contact surface for rigid coupling to the end of the telescopic arm of the crane having an inlet for the lifting cable that arrives from the winch and, at the other end, an outlet for the cable that arrives from the guiding pulley, surrounded by contact edges for the abutment portion of the lifting hook, the profile of said edges being shaped like an arc traced by the involute to a circle whose evolute is a circular contour being concentric and internal, external or coincident with respect to the pitch circle of the guiding pulley.
  • reference numeral 1 generally designates a typical lifting crane with telescopic arms, which comprises a base column 2, a first rigid arm 3 which is articulated to the column and is controlled by a corresponding first hydraulic jack 3a being adapted to produce its oscillation with respect to the column, and a second arm 4, designated as telescopic arm, which is articulated to the arm 3 and is composed of a plurality of mutually telescopic portions 4a, 4b, etcetera.
  • the arm 4 is in turn controlled by a hydraulic jack 5 which is adapted to produce its oscillation with respect to the arm 3 and includes additional hydraulic jacks 4k for the extension and retraction of the telescopic arms.
  • the telescopic arm 4 further has, at the pivoting section, a winch 6, preferably of the hydraulic type, which actuates a lifting cable 7 being guided by a pulley 8 which is arranged at the end of the telescopic portion 4b that protrudes furthest (when the arm is in the fully extended configuration) and ends with the lifting hook 9.
  • the limit stop is associated with the pulley 8.
  • the device 10 ( Figure 2) is constituted by a sturdy rigid housing 11 made of metal plate, which contains the guiding pulley 8, being pivoted so that it can rotate freely; the housing has, at one end, a contact surface 12 for the rigid coupling of said housing, by way of bolts B, to the outer portion 4b of the telescopic arm; the contact surface 12 is provided with an inlet 13 for the lifting cable 7.
  • the housing 11 has an outlet 14 for the cable 7 which is surrounded by contact edges 15 for the abutment portion of the lifting hook 9; the profile of the edges is shaped like an arc traced by the involute to a circle whose evolute is a circular contour being concentric and internal or external or coincident with respect to the pitch circle of said guiding pulley.
  • the contact edges 15 are, at the involute arc, strictly perpendicular to the cable 7, and the contact force between said contact edges and the abutment surface 9a of the hook 9 also is strictly perpendicular to the surface and therefore has no transverse components which can move the hook from the inactive position in abutment against the edges 15.
  • the involute arc covers a convenient angle, typically a center angle of 160°. This ensures that the abutment surfaces of the lifting hook are perpendicular with respect to the cable, and therefore ensures that said hook is perfectly stable in its inactive abutment position, for any angular position of the arms of the crane 1.
  • Figures 3 and 4 clearly illustrate the stable condition of the hook 9 in limit stop conditions for two extreme configurations of the crane, designated by the reference numerals 1' and 1" respectively, and even in the presence of excessive mechanical tensions on the cable, caused for example by inadvertent extensions of the telescopic arm 4 ( Figures 5 and 6).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP01105315A 2000-03-10 2001-03-07 Endlagestoppvorrichtung für Hebekräne, insbesondere Kräne mit teleskopischen Auslegern Withdrawn EP1134178A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO000220 2000-03-10
IT2000TO000220A IT1319949B1 (it) 2000-03-10 2000-03-10 Dispositivo fine corsa per gru di sollevamento, particolarmente gru abracci sfilabili.

Publications (2)

Publication Number Publication Date
EP1134178A2 true EP1134178A2 (de) 2001-09-19
EP1134178A3 EP1134178A3 (de) 2002-11-06

Family

ID=11457554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01105315A Withdrawn EP1134178A3 (de) 2000-03-10 2001-03-07 Endlagestoppvorrichtung für Hebekräne, insbesondere Kräne mit teleskopischen Auslegern

Country Status (2)

Country Link
EP (1) EP1134178A3 (de)
IT (1) IT1319949B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1491485A1 (de) * 2003-06-23 2004-12-29 FASSI GRU IDRAULICHE S.p.A. Kran mit einer Seilwinde und mit einer Zugsteuereinrichtung
EP3502036A1 (de) * 2017-12-20 2019-06-26 Cargotec Patenter AB Kabelführungsvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB379190A (en) * 1931-02-21 1932-08-25 Andre Faure Improvements in or relating to jib cranes
FR1587808A (de) * 1968-10-04 1970-03-27
FR2136844A1 (de) * 1971-04-29 1972-12-29 Brissonneau & Lotz
US3850306A (en) * 1966-11-03 1974-11-26 Us Navy Crane attachment for dampening swinging motion
DE8708888U1 (de) * 1987-06-26 1987-08-13 Fa. Palfinger, Salzburg Kran
DE9420088U1 (de) * 1994-12-16 1995-02-16 Rotzler GmbH + Co Spezialfabrik für Seilwinden und Hebezeuge, 79585 Steinen Rollenkopf für einen Kranausleger
DE4427750A1 (de) * 1993-08-27 1995-03-09 Franz Hochleitner Last- und Chokerhaken für Seilkran-Automaten mit Einfahrtsbügel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB379190A (en) * 1931-02-21 1932-08-25 Andre Faure Improvements in or relating to jib cranes
US3850306A (en) * 1966-11-03 1974-11-26 Us Navy Crane attachment for dampening swinging motion
FR1587808A (de) * 1968-10-04 1970-03-27
FR2136844A1 (de) * 1971-04-29 1972-12-29 Brissonneau & Lotz
DE8708888U1 (de) * 1987-06-26 1987-08-13 Fa. Palfinger, Salzburg Kran
DE4427750A1 (de) * 1993-08-27 1995-03-09 Franz Hochleitner Last- und Chokerhaken für Seilkran-Automaten mit Einfahrtsbügel
DE9420088U1 (de) * 1994-12-16 1995-02-16 Rotzler GmbH + Co Spezialfabrik für Seilwinden und Hebezeuge, 79585 Steinen Rollenkopf für einen Kranausleger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1491485A1 (de) * 2003-06-23 2004-12-29 FASSI GRU IDRAULICHE S.p.A. Kran mit einer Seilwinde und mit einer Zugsteuereinrichtung
EP3502036A1 (de) * 2017-12-20 2019-06-26 Cargotec Patenter AB Kabelführungsvorrichtung

Also Published As

Publication number Publication date
ITTO20000220A0 (it) 2000-03-10
ITTO20000220A1 (it) 2001-09-10
IT1319949B1 (it) 2003-11-12
EP1134178A3 (de) 2002-11-06

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