US3844417A - Hoisting crane with horizontal lattice jib and bravelling carriage - Google Patents

Hoisting crane with horizontal lattice jib and bravelling carriage Download PDF

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Publication number
US3844417A
US3844417A US00137265A US13726571A US3844417A US 3844417 A US3844417 A US 3844417A US 00137265 A US00137265 A US 00137265A US 13726571 A US13726571 A US 13726571A US 3844417 A US3844417 A US 3844417A
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US
United States
Prior art keywords
bars
runway
hoisting crane
runway frame
carrying wheel
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
US00137265A
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English (en)
Inventor
L Holm
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Linden Alimak AB
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Linden Alimak AB
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Filing date
Publication date
Application filed by Linden Alimak AB filed Critical Linden Alimak AB
Application granted granted Critical
Publication of US3844417A publication Critical patent/US3844417A/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
    • B66C7/00—Runways, tracks or trackways for trolleys or cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
    • B66C9/14—Trolley or crane travel drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/01—General aspects of mobile cranes, overhead travelling cranes, gantry cranes, loading bridges, cranes for building ships on slipways, cranes for foundries or cranes for public works
    • B66C2700/012—Trolleys or runways
    • B66C2700/018—Construction details related to the trolley movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0385—Cranes with trolleys movable along adjustable or slewable arms

Definitions

  • the frame bars which simultaneously serve as a runway for the travelling carriage, heretofore comprised rolled sections with sharp edges.
  • These cranes showed substantially two disadvantages, viz. that the sharp-edge section produces a high wind load and that the sharp-edge runway frame bars due to geometric conditions cannot be connected centrally to diagonal and horizontal bars as the resulting stress concentrations involve a risk, especially from a fatigue point of view.
  • Central connection here is to be understood such that the centre of gravity axes of the horizontal and diagonal bars intersect the centre of gravity axis of the runway frame bar.
  • the hoisting crane which is characterized in that the runway frame bar or bars comprise tubes or solid bars of circular crosssection, that the runway frame bar and connecting bar are so connected that their centre of gravity axes intersect each other, and that the carrying wheel and runway frame bar are so arranged relative to each other that the force resultant from the carrying wheel also intersects the centre of gravity axis of the runway frame bar.
  • Building cranes for the aforesaid demand heretofore were dimensioned after known construction principles. Accordingly, the cranes, particularly high building cranes, had a disproportionately heavy construction weight.
  • the dimensioning factors for such a building crane include reach, lifting power and wind load.
  • the wind speeds increase with the height above the ground, and also the distance between the mounting of the crane and the centre of the wind force application surface on a building crane increases with rising construction height. Due to these two circumstances, the wind load becomes a factor of growing importance in high building cranes. Attempts were, therefore, made to find new construction principles rendering possible a reduction of the wind load.
  • a substantial part of the total building crane surface exposed to wind is formed by the jib.
  • .libs usually comprise three or four horizontal frame bars, depending on whether the cross-section is triangular or rectangular.
  • the frame bars are interconnected by diagonal bars.
  • the lower frame bar or bars constitute simultaneously a runway for a travelling carriage carrying useful load.
  • the frame bars in known constructions comprise rolled sharp-edge section beams.
  • the cross-sectional height of such a beam exposed to wind load is between 200 and 250 mm.
  • the frame bars of the jib offer a large total application surface to the wind.
  • the air resistance coefficient depending on the cross-sectional shape, varies between 1.8 and 2.0 for bars with sharp cross-section edges. This applies to all cases, irrespective of the wind speed.
  • the air resistance coefficient c becomes evident from the relation P c A (v 16), where P is the force of the wind on an object, A is the surface of the object projected in the wind direction, and v is the wind speed.
  • P the force of the wind on an object
  • A the surface of the object projected in the wind direction
  • v the wind speed.
  • the air resistance coefficient decreases from about 1.2 at sub-critical flow (at wind speeds below about 35 m/s) to between 0.7 and 0.4 at super-critical flow. With increasing wind speed, the coefficient decreases to the limit value of about 0.4.
  • cranes higher than 30 in here referred to are to be dimensioned for super-critical windv speeds. Cranes for certain export markets are subjected to wind speeds exceeding considerably those under Swedish conditions.
  • the frame bars acting as a runway are circular tubes.
  • the wheels of the travelling carriage run on the upper surfaces of the tubes.
  • the construction principle applied according to the invention results in an ideal joint geometry.
  • Connecting diagonal and vertical bars are flattened at their ends so as to allow a carrying wheel rolling on a frame bar to run past a joint.
  • Circular tubes for example, always are most advantageous with respect to buckling. Owing to the fact that tubes of a given outer diameter are kept in stock with several different wall thicknesses, the bearing capacity for a jib, or a part thereof, at maintained outer dimensions can be adjusted within wide limits. Circular tubes are also from a corrosion and maintenance point of view more advantageous than the sections heretofore used.
  • FIG. 1 in a side view shows a section of a jib with the travelling carriage according to the invention
  • FIG. 2 shows the cross-section according to the marking II-Il in FIG. 1, and
  • FIG. 3 shows on an enlarged scale the left-hand joint in FIG. 2.
  • the jib comprises three parallel frame bars 1, 2 and 3, which are tubes of circular cross-section. Said bars are interconnected by connecting bars 4, and, respectively, 6, whereof the bars 4 connect the frame bars 1 and 2 on one side of the jib, and the bars 5 connect the frame bars 1 and 3 on the other side of the jib.
  • the horizontal connecting bars 6 connect the lower frame bars 2 and 3 of the jib.
  • the height of the jib cross-section exceeds the width thereof, see FIG. 2.
  • the connecting bars are secured at the frame bars in joints such as at 7 which designates a joint at which two bars 4 (FIG. 1) or and one or more bars 6 (FIG. 2) meet.
  • the connecting and frame bars are so arranged that their centre of gravity axes intersect at one point.
  • the centre of gravity axes 4A of the bars 4 the centre of gravity axis 2A of the frame bar 2, and the centre of gravity axis or axes 6A of the bar or bars 6 extend through one common point 8.
  • a travelling carriage 11 with upwardly directed arms l7, 18, on which carrying wheels 12 are mounted which run directly on the lower frame bars 2 and 3.
  • the travelling carriage carries by wires 13 a lifting means 14.
  • the carriage is moved horizontally by wires 15 and 16. Due to the circular crosssectional shape of the lower frame bars, the resulting force F from the carrying wheel 12, see FIG. 3, acts through the centre of gravity axis of the frame bar.
  • the carrying wheels are so inclined that the angle a between the frame bar radius through the contact point of the carrying wheel and the horizontal plane is acute.
  • the angle a can also be imagined to be right or obtuse.
  • the connecting bars which in the embodiment shown are tubes with circular cross-section, by being flattened at the connection to the runway frame bars provide more space to the carrying wheels.
  • the travelling carriage is shown laterally guided by contact between the arms 17 and I8 and the runway frame bars. It is, of course, also possible to mount separate guide wheels on the carriage.
  • a hoisting crane comprising,
  • travelling carriage supported by said runway frame bars said travelling carriage having lifting means and including also carrying wheels which run directly on said runway frame bars,
  • said runway frame bars having a circular crosssection and being interconnected to said connecting bars with the center of gravity axis of each connecting bar intersecting the central longitudinal axis of the relevant runway frame bar,
  • each said carrying wheel having an essentially cylindrical configuration and being supported on the respective circular runway frame bar with its line of force intersecting the central longitudinal axis of said respective runway frame bar, said carrying wheel making an essentially point contact with said runway frame bar to thereby ensure the maintainance of intersection of said line of force with said longitudinal axis irrespective of the tilting of said carrying wheel as it rolls along said runway frame bar.
  • a hoisting crane according to claim 1, characterized in that it comprises two lower runway frame bars each of which supporting the carrying wheels of the travelling carriage.
  • a hoisting crane according to claim 1 characterized in that the jib cross-section is triangular.
  • a hoisting crane according to claim 1 characterized in that the angle between the force resultant from the carrying wheel and the horizontal plane is an acute angle.
  • a hoisting crane according to the claim 1 characterized in that the angle between the force resultant from the carrying wheel and the horizontal plane is a right angle.
  • a hoisting crane according to claim 1 characterized in that the connecting bars extending nearest to the carrying wheel are flattened at their connection to the runway frame bar so as to provide more space for the carrying wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00137265A 1970-05-04 1971-04-26 Hoisting crane with horizontal lattice jib and bravelling carriage Expired - Lifetime US3844417A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE06078/70A SE333050B (enrdf_load_stackoverflow) 1970-05-04 1970-05-04

Publications (1)

Publication Number Publication Date
US3844417A true US3844417A (en) 1974-10-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00137265A Expired - Lifetime US3844417A (en) 1970-05-04 1971-04-26 Hoisting crane with horizontal lattice jib and bravelling carriage

Country Status (6)

Country Link
US (1) US3844417A (enrdf_load_stackoverflow)
DE (1) DE2121288A1 (enrdf_load_stackoverflow)
DK (1) DK125638B (enrdf_load_stackoverflow)
FR (1) FR2088299B3 (enrdf_load_stackoverflow)
GB (1) GB1322663A (enrdf_load_stackoverflow)
SE (1) SE333050B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615061A1 (de) * 1985-05-09 1986-11-13 Walter Attnang-Puchheim Sticht Einrichtung zur handhabung von bauteilen
US4667835A (en) * 1981-11-26 1987-05-26 Kirk Geoffrey F Hydraulically operated cranes
US4710054A (en) * 1980-07-18 1987-12-01 Allen Engineering Corporation Material spreader system
USD440023S1 (en) 1998-02-27 2001-04-03 Fps Investments, Llc Truss style trolley beam for a fall protection system
US6269904B1 (en) * 1998-02-27 2001-08-07 Fps Investments, Llc Truss style trolley beam for a fall protection system
US20110083811A1 (en) * 2009-10-12 2011-04-14 Henry Brian D Extendable welding machine
US10100537B1 (en) 2017-06-20 2018-10-16 Allen Engineering Corporation Ventilated high capacity hydraulic riding trowel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508749A1 (de) * 1985-03-12 1986-09-18 Erwin Mehne GmbH & Co, 7100 Heilbronn Krantraeger
DE3602575A1 (de) * 1986-01-29 1987-07-30 Haaf Gmbh Traeger
CN104973523B (zh) * 2015-06-30 2017-11-14 中联重科股份有限公司 塔机起重臂组装结构、组装方法及塔机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU208913A1 (ru) * И. И. Абрамович, Л. И. Литвинова , Г. А. Котельников Пролетное строение крана мостового типа
DE233205C (enrdf_load_stackoverflow) *
US3021014A (en) * 1959-01-19 1962-02-13 Link Belt Speeder Corp Crane boom structure
DE1169095B (de) * 1961-11-11 1964-04-30 Herbert Kasting Kastentraeger-Kranbruecke fuer Konsollaufkatze
DE1248256B (de) * 1963-05-25 1967-08-24 Maschf Augsburg Nuernberg Ag Kranbauteil, insbesondere Krantraeger oder Kranausleger
US3494593A (en) * 1968-01-29 1970-02-10 Schlumberger Technology Corp Portable mast
US3583327A (en) * 1969-09-02 1971-06-08 Harsco Corp Track

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU208913A1 (ru) * И. И. Абрамович, Л. И. Литвинова , Г. А. Котельников Пролетное строение крана мостового типа
DE233205C (enrdf_load_stackoverflow) *
US3021014A (en) * 1959-01-19 1962-02-13 Link Belt Speeder Corp Crane boom structure
DE1169095B (de) * 1961-11-11 1964-04-30 Herbert Kasting Kastentraeger-Kranbruecke fuer Konsollaufkatze
DE1248256B (de) * 1963-05-25 1967-08-24 Maschf Augsburg Nuernberg Ag Kranbauteil, insbesondere Krantraeger oder Kranausleger
US3494593A (en) * 1968-01-29 1970-02-10 Schlumberger Technology Corp Portable mast
US3583327A (en) * 1969-09-02 1971-06-08 Harsco Corp Track

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4710054A (en) * 1980-07-18 1987-12-01 Allen Engineering Corporation Material spreader system
US4667835A (en) * 1981-11-26 1987-05-26 Kirk Geoffrey F Hydraulically operated cranes
DE3615061A1 (de) * 1985-05-09 1986-11-13 Walter Attnang-Puchheim Sticht Einrichtung zur handhabung von bauteilen
US4725193A (en) * 1985-05-09 1988-02-16 Walter Sticht System for handling structural components
USD440023S1 (en) 1998-02-27 2001-04-03 Fps Investments, Llc Truss style trolley beam for a fall protection system
US6269904B1 (en) * 1998-02-27 2001-08-07 Fps Investments, Llc Truss style trolley beam for a fall protection system
US20110083811A1 (en) * 2009-10-12 2011-04-14 Henry Brian D Extendable welding machine
US8141609B2 (en) * 2009-10-12 2012-03-27 Miller Weldmaster Corporation Extendable welding machine
US10100537B1 (en) 2017-06-20 2018-10-16 Allen Engineering Corporation Ventilated high capacity hydraulic riding trowel

Also Published As

Publication number Publication date
FR2088299A3 (enrdf_load_stackoverflow) 1972-01-07
GB1322663A (en) 1973-07-11
DK125638B (da) 1973-03-19
DE2121288A1 (de) 1972-05-31
SE333050B (enrdf_load_stackoverflow) 1971-03-01
FR2088299B3 (enrdf_load_stackoverflow) 1974-02-15

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