US3890757A - Boom members having stiffener elements for crane boom constructions - Google Patents

Boom members having stiffener elements for crane boom constructions Download PDF

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Publication number
US3890757A
US3890757A US446593A US44659374A US3890757A US 3890757 A US3890757 A US 3890757A US 446593 A US446593 A US 446593A US 44659374 A US44659374 A US 44659374A US 3890757 A US3890757 A US 3890757A
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United States
Prior art keywords
boom
web
pair
openings
flanges
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
US446593A
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English (en)
Inventor
Gerald P Lamer
Terry M Holmes
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Case LLC
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JI Case Co
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Filing date
Publication date
Application filed by JI Case Co filed Critical JI Case Co
Priority to US446593A priority Critical patent/US3890757A/en
Priority to CA206,831A priority patent/CA1005018A/en
Priority to AU75692/74A priority patent/AU480963B2/en
Priority to GB5393474A priority patent/GB1427290A/en
Priority to FR7441512A priority patent/FR2262640B1/fr
Priority to JP14492974A priority patent/JPS5525115B2/ja
Priority to BR10544/74A priority patent/BR7410544A/pt
Priority to DE19742461924 priority patent/DE2461924A1/de
Priority to ZA00750644A priority patent/ZA75644B/xx
Application granted granted Critical
Publication of US3890757A publication Critical patent/US3890757A/en
Priority to CA257,304A priority patent/CA1014112A/en
Assigned to CASE CORPORATION, A CORP. OF DELAWARE reassignment CASE CORPORATION, A CORP. OF DELAWARE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: J. I. CASE COMPANY, A CORP. OF DELAWARE
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Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/08—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with apertured web, e.g. with a web consisting of bar-like components; Honeycomb girders
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0452—H- or I-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0473—U- or C-shaped

Definitions

  • ABSTRACT A multisection crane boom construction is disclosed herein.
  • the various boom sections are each formed of a plurality of members which are interconnected in a unique fashion and are reinforced to provide boom sections that have a high strength-to-weight ratio and provide both vertical and lateral rigidity.
  • Each boom section consists of a pair of elongated channel members having webs and flanges with the flanges being "interconnected by connecting members and the webs being reinforced by web stiffeners to increase the buckling resistance of the web portions.
  • the present invention provides a boom design with a high strength-to-weight ratio,
  • the elements forming the boom are rigidified in such a manner that the overall weight of the boom can be substantially reduced without sacrificing lifting capacity.
  • the boom construction of the present invention consists of a pair of elongated channel members that each have a central web portion and a pair of flanges extending substantially perpendicular at opposite edges of the web portions.
  • the channel members are positioned so that the web portions are located in spaced parallel relation to each. other and extend substantially vertically with respect to the boom.
  • the respective pair of adjacent flanges of the two channel members are interconnected by plates which define the upper and lower horizontal portions of the substantially rectangular hollow boom.
  • the hollow rectangular boom is reinforced at each of the corners thereof by four elongated angle irons that have their bases located at the respective corners of the rectangular boom and have legs extending from the corners thereof along the respective flanges and webs of the channel members.
  • the webs of the respective channel members are reinforced between opposite edges thereof in a manner to produce a high strength web portion that has a high strength-to-weight ratio. More specifically, the reinforcing means consists of generally transversely extending stiffeners which provide vertical and lateral rigidity to the boom section.
  • the web stiffeners consist of a plurality of longitudinally spaced stiffener elements for each web portion of the elongated channel members.
  • Each stiffener element includes a central core having a plurality of arms extending therefrom and integral therewith.
  • the central core is located generally along the center line between the pair of flanges that extend from opposite edges of the web portion of the elongated channel and, in the specific embodiment illustrated, the stiffener elements are X-shaped with the respective pairs of arms extending in opposite directions and terminating adjacent the flanges of each web portion.
  • the web portions are further rigidified by substantially circular buttons which have a circumferential dimension greater than that of the central cores for the respective stiffening elements and these buttons are aligned with the central cores and connected to the web portions of the respective elongated channels.
  • the web portions have cutouts that are substantially diamond shaped and extend generally parallel to the adjacent edges of the arms of adjacent pairs of web stiffeners. The result is that the overall structure for the boom sections will substantially decrease the weight of the unit without sacrificing lateral or vertical stability of the unit. This will substantially increase the load capacity that can be lifted with a crane that has a plurality of boom sections.
  • the web stiffeners consist of a plurality of longitudinally spaced reinforcing channel bars that extend substantially vertically or perpendicular with respect to the longitudinal axis of the elongated channel members and the channel bars each have a pair of legs extending from a web portion thereof with the free ends of the legs being connected to the webs of the channel members.
  • FIG. 1 shows a transport vehicle having a multisection crane boom supported thereon;
  • FIG. 2 shows a plan view of one of the outer telescopic boom sections
  • FIG. 3 shows a vertical section of the boom section shown in FIG. 2, as viewed along line 3-3 of FIG. 2;
  • FIG. 4 is a transverse section of the boom section shown in FIG. 3, as viewed along line 4-4 of FIG. 3;
  • FIG. 5 is an exploded fragmentary perspective view of a portion of the boom section shown in FIG. 2;
  • FIG. 6 is an enlarged fragmentary view of the base section of the boom shown in FIG. 1;
  • FIG. 7 is a transverse section of the boom shown in FIG. 6, as viewed along lines 77 of FIG. 6;
  • FIG. 8 is a horizontal section, as viewed along line 88 of FIG. 6.
  • FIG. 1 there is shown a vehicle 10 having turntable l2 rotatable thereon with boom 14 supported on turntable 12 by horizontal pin 16.
  • Boom 14 is pivoted about pin 16 through fluid ram 18, which is interposed between turntable l2 and boom 14.
  • Boom 14 consists of a plurality of sections including a base section 20 and a plurality of additional outer sections 22 that are telescoped relative to each other and all outer sections are capable of being retracted into the outer open end of base section 20.
  • the telescoping movement may be accomplished through any suitable means, such as fluid rams (not shown).
  • FIGS. 2 through 5 show the details of boom section 22.
  • Boom section 22 consists of a pair of elongated channel members 24 each of which has web portion 26 and a pair of flanges 28 extending from opposite edges of elongated web portion 26.
  • the two elongated channel members are positioned so that the web portions are in spaced, parallel vertical planes and the flanges of the respective channel members extend towards each other, as shown in FIG. 4.
  • the free edges of adjacent flanges of the respective channel members are spaced from each other and are interconnected by a pair of interconnecting members or plates 30 and plates 30 are preferably welded to flanges 28.
  • the plates 30 and channels 24 define a generally hollow rectangular box-like structure in crosssection having a plurality of flat walls.
  • Each of the corners of the hollow rectangular box-like structure is reinforced by reinforcing plates which are located adjacent the intersection between flanges 28 and web portions 26.
  • the pairs of reinforcing plates for each of the corners consists of angle iron 32 which has a pair of legs 34 that respectively extend along flanges 28 and web portions 26 and are secured thereto, as by welding.
  • the purpose of the reinforcing plates, defined by legs 34, is to add the most efficient mass as far from the neutral axis as possible so as to achieve the greatest possible stiffness for the box-like boom structure.
  • An additional advantage is that angle irons 32 transmit the vertical compressive reaction forces into the web portions 26 to increase the distortion strength thereby greatly decreasing the potential of lateral distortion of the boom section.
  • a further advantage of the angle irons 32 is to provide a fixed corner support at each corner of the boom section, which increases the resistance to buckling stresses that may be developed in the web portions 26.
  • angle irons 32 may also act as wear plates between adjacent portions of two adjacent boom sections.
  • An inspection of FIG. 4 shows that the thickness of interconnecting plates 30 is slightly less than the thickness of the angle iron legs 34 so that the surfaces of legs 34 extend above the outer surfaces of plates 30.
  • the elongated boom section 22 also has web stiffeners connected to each web portion for increasing the buckling resistance of the web portion when weight is supported by the boom 14.
  • the web stiffeners for boom section 22 consist of a plurality of stiffener elements 40 which are longitudinally spaced along web portion 26.
  • Each stiffening element 40 has a central core 42 and four arms 44 extending in different directions from central core 42 towards the respective flanges 28 of the associated channel member 24.
  • legs 44 and central core 42 define a generally X-shaped stiffener element, in plan view, with the centers of cores 42 located generally along center line CL of the elongated channel, center line CL being located between flanges 28 and i l l l spaced an equal distance therefrom, as shown in FIG. 3.
  • the pairs of aligned arms 44 have a combined vertical height which is substantially equal to the dimension between opposite edges of web portion 26 and the arms extend diagonally, as viewed from the inside of the box structure defining boom section 22.
  • the stiffener elements are located inside the box section and are secured directly to web portions 26, as by welding.
  • diamond-shaped openings may be cut from the boundaries defined by an adjacent pair of web stiffener elements. The net effect is that the material cut from the web portions 26 substantially decreases the overall weight of the boom section. This will create a semi-closed lattice boom construction as shown in FIG. 3.
  • the respective web stiffeners including stiffener elements 40 and stiffener buttons 52 provide increased vertical buckling strength for the web and permit greater shear transfer for the web portion without adding a substantial amount of weight to the overall boom section.
  • the amounts of material removed from the web portions to define openings 50 is greater than the weight of the web stiffeners added to the boom. The effect is that the overall weight of the boom section is decreased while the strength thereof is increased.
  • FIGS. 6 through 8 Another type of boom section is shown in FIGS. 6 through 8 and this boom section is particularly adapted to use as the base section 20 which is attached to the turntable.
  • Base section 20 is in many respects similar to each of boom sections 22 and differs primarily in the reinforcement for the web portions of the channel members.
  • boom section 20 again consists of a pair of elongated channel members each having a web portion 62 and flanges 64 extending from opposite edges of the web portion.
  • Channel members 60 are positioned so that web portions 62 extend parallel to each other and are horizontally spaced by a distance so that the free edges of adjacent flanges 64 are spaced from each other.
  • Flanges 64 are interconnected by a pair of interconnecting members 66, which may be secured thereto, by welding.
  • Each of the web portions 62 is again reinforced by web stiffeners 71 and in boom section 20, web stiffeners 71 consist of elongated reinforcing channel bars,
  • each of which has a web 72 and a pair of legs 74 extending from the web.
  • the free edges of legs 74 are secured directly to the web portions 62 of channel member 60 to provide the desired reinforcement.
  • the longitudinal spacing of the web stiffeners 71 is a function of the overall length of the boom section, as well as the shear stress in the web.
  • bars or plates 70 at the respective corners of the box-like structure and web stiffeners 71 will substantially increase the transfer of vertical compressive reaction forces directly into web portions 62 to produce a greater resistance to buckling stresses that may be developed on web portions 62.
  • the web stiffeners are designed so as to produce a minimum amount of weight with a maximum amount of resistance to local compressive reaction forces and buckling stresses that may be developed in the boom section. Since this boom section is specifically designed for use as the base section, the overall weight of the boom section is not quite as critical as the weight of the remaining telescoping boom sections 22, and thus there is no need for producing cutouts in web portions.
  • additional longitudinally extending reinforcing channel bars 80 which are positioned between adjacent pairs of vertical channel bars 71. These channel bars have a first leg 82 secured to web portion 62 and a second leg 84 connected to angle iron 68.
  • the present invention provides an improved boom construction which produces greatest resistance to buckling stresses of the vertical portions of the boom with a minimum amount of overall weight.
  • a boom for a crane or the like comprising an elongated hollow member having a plurality of flat walls, at least one of said walls having a plurality of openings spaced from each other, a stiffening element located between each adjacent pair of openings, each stiffening element having a central core generally aligned with a longitudinal center line for said at least one wall and a plurality of arms extending from said central core to the outer edges of said at least one member, said stiffening elements being secured to a surface of said at least one wall between said openings and reinforcing the edges of said openings, and a plurality of buttons each having a dimension greater than the dimension of said cores, said buttons overlying respective central cores and being secured to said surface.
  • said hollow member is defined by a pair of elongated channel members, each having a web portion and flanges at opposite edges of said web portion, said channel members being positioned so that said web portions define a pair of said flat walls and said flanges of respective channels extend towards each other with free edges spaced from each other, and a pair of interconnecting members connecting adjacent pairs of flanges to define a further pair of said flat walls.
  • Patent No. "31,498” only indicates “Germany” and should be E. Germany-. 0

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US446593A 1974-02-28 1974-02-28 Boom members having stiffener elements for crane boom constructions Expired - Lifetime US3890757A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US446593A US3890757A (en) 1974-02-28 1974-02-28 Boom members having stiffener elements for crane boom constructions
CA206,831A CA1005018A (en) 1974-02-28 1974-08-12 Boom construction for crane booms
AU75692/74A AU480963B2 (en) 1974-02-28 1974-11-25 Boom members having stiffener elements for crane boom construction
GB5393474A GB1427290A (en) 1974-02-28 1974-12-13 Crane booms
JP14492974A JPS5525115B2 (enrdf_load_stackoverflow) 1974-02-28 1974-12-17
BR10544/74A BR7410544A (pt) 1974-02-28 1974-12-17 Lanca para guindaste ou semelhantes
FR7441512A FR2262640B1 (enrdf_load_stackoverflow) 1974-02-28 1974-12-17
DE19742461924 DE2461924A1 (de) 1974-02-28 1974-12-31 Ausleger fuer einen kran
ZA00750644A ZA75644B (en) 1974-02-28 1975-01-30 Boom construction for crane booms
CA257,304A CA1014112A (en) 1974-02-28 1976-07-20 Boom construction for crane booms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US446593A US3890757A (en) 1974-02-28 1974-02-28 Boom members having stiffener elements for crane boom constructions

Publications (1)

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US3890757A true US3890757A (en) 1975-06-24

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Application Number Title Priority Date Filing Date
US446593A Expired - Lifetime US3890757A (en) 1974-02-28 1974-02-28 Boom members having stiffener elements for crane boom constructions

Country Status (8)

Country Link
US (1) US3890757A (enrdf_load_stackoverflow)
JP (1) JPS5525115B2 (enrdf_load_stackoverflow)
BR (1) BR7410544A (enrdf_load_stackoverflow)
CA (1) CA1005018A (enrdf_load_stackoverflow)
DE (1) DE2461924A1 (enrdf_load_stackoverflow)
FR (1) FR2262640B1 (enrdf_load_stackoverflow)
GB (1) GB1427290A (enrdf_load_stackoverflow)
ZA (1) ZA75644B (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003168A (en) * 1975-06-27 1977-01-18 Walter Kidde & Company, Inc. Crane boom of trapezoidal boom sections having reinforcing rings
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4337601A (en) * 1980-04-24 1982-07-06 Harnischfeger Corporation High-strength light-weight boom section for telescopic crane boom
US6837446B1 (en) * 2003-01-16 2005-01-04 Sprayer Specialties, Inc. Unitary boom structure
US20060277859A1 (en) * 2003-09-01 2006-12-14 Forster Rohr Und Profiltechnik Ag Profile and method for producing a profile
US20090223093A1 (en) * 2006-02-09 2009-09-10 Bernhard Willaredt Support Arm for a Work Machine
US20100071141A1 (en) * 2008-09-19 2010-03-25 Randall Julian Reiner Variable length beam
US20100205891A1 (en) * 2009-02-16 2010-08-19 Bong William L Assembly, system and method for automated vertical moment connection
CN102249161A (zh) * 2010-05-21 2011-11-23 上海三一科技有限公司 一种起重机多主弦杆臂架
US20130020274A1 (en) * 2011-07-21 2013-01-24 Arumugam Munuswamy Tailor welded panel beam for construction machine and method of manufacturing
US20130071216A1 (en) * 2011-09-20 2013-03-21 Steven J. Ditzler Exoskeleton Boom Structure
CN103541494A (zh) * 2013-09-22 2014-01-29 沈阳建筑大学 耗能钢梁及其加工方法
US8678210B1 (en) * 2010-11-17 2014-03-25 Link-Belt Construction Equipment Co., L.P., Lllp Telescoping boom assembly with base section having primary shell and secondary formed shell
US20150013266A1 (en) * 2012-02-09 2015-01-15 Modular Walling Wystems Ltd Modular construction system
US20160002925A1 (en) * 2014-07-01 2016-01-07 Hitachi Metals Techno, Ltd. Beam reinforcing metallic material and beam reinforcing structure
USD748181S1 (en) * 2013-03-11 2016-01-26 Kessler Crane, Inc. Jib
CN105421660A (zh) * 2015-12-11 2016-03-23 江苏华海钢结构有限公司 一种钢结构梁
US9695591B2 (en) 2014-07-01 2017-07-04 Senqcia Corporation Beam reinforcing structure
CN110723657A (zh) * 2019-09-20 2020-01-24 中铁建工集团有限公司 一种民用住宅建筑施工吊装装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112649A (en) * 1977-08-26 1978-09-12 Harnischfeger Corporation Boom section for telescopic crane boom
IT1141853B (it) * 1980-03-19 1986-10-08 Condecta Macchine Edili Srl Struttura reticolare con elementi poligonali per traliccio,particolarmente di gru a torre automontante
DD215518A5 (de) * 1982-10-27 1984-11-14 Fuchs Fa Johannes Ausleger fuer hebezeuge, insbesondere hebebuehnen, bagger oder dergleichen
JPS59192089U (ja) * 1983-06-08 1984-12-20 ハイソ−ル・ジヤパン株式会社 クレ−ン車等の起重杆
JP2010254398A (ja) * 2009-04-22 2010-11-11 Kobe Steel Ltd クレーンのラチスブーム
WO2020113133A1 (en) * 2018-11-28 2020-06-04 President And Fellows Of Harvard College Structural design principles for diagonal bracings in truss and beam support systems

Citations (5)

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Publication number Priority date Publication date Assignee Title
US777742A (en) * 1904-07-12 1904-12-20 Georges Adolphe Parent System of metallic girders for structures of cement, concrete, or the like.
US2125692A (en) * 1932-04-27 1938-08-02 Budd Edward G Mfg Co Beam structure
US3283464A (en) * 1960-05-10 1966-11-08 Litzka Franz Honeycomb girders and method for making same
US3378978A (en) * 1965-05-21 1968-04-23 Richier Sa Shaft of telescoped sections
US3708937A (en) * 1970-09-28 1973-01-09 Kidde & Co Walter Trapezoidal telescoping crane boom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US777742A (en) * 1904-07-12 1904-12-20 Georges Adolphe Parent System of metallic girders for structures of cement, concrete, or the like.
US2125692A (en) * 1932-04-27 1938-08-02 Budd Edward G Mfg Co Beam structure
US3283464A (en) * 1960-05-10 1966-11-08 Litzka Franz Honeycomb girders and method for making same
US3378978A (en) * 1965-05-21 1968-04-23 Richier Sa Shaft of telescoped sections
US3708937A (en) * 1970-09-28 1973-01-09 Kidde & Co Walter Trapezoidal telescoping crane boom

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4003168A (en) * 1975-06-27 1977-01-18 Walter Kidde & Company, Inc. Crane boom of trapezoidal boom sections having reinforcing rings
US4337601A (en) * 1980-04-24 1982-07-06 Harnischfeger Corporation High-strength light-weight boom section for telescopic crane boom
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Also Published As

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CA1005018A (en) 1977-02-08
FR2262640A1 (enrdf_load_stackoverflow) 1975-09-26
GB1427290A (en) 1976-03-10
JPS5525115B2 (enrdf_load_stackoverflow) 1980-07-03
AU7569274A (en) 1976-05-27
JPS50118450A (enrdf_load_stackoverflow) 1975-09-17
BR7410544A (pt) 1976-06-22
DE2461924A1 (de) 1975-09-04
FR2262640B1 (enrdf_load_stackoverflow) 1980-03-28
ZA75644B (en) 1976-01-28

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