US3706285A - Hoisting crane - Google Patents

Hoisting crane Download PDF

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Publication number
US3706285A
US3706285A US107076A US3706285DA US3706285A US 3706285 A US3706285 A US 3706285A US 107076 A US107076 A US 107076A US 3706285D A US3706285D A US 3706285DA US 3706285 A US3706285 A US 3706285A
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United States
Prior art keywords
jib
modules
members
crane
rods
Prior art date
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Expired - Lifetime
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US107076A
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English (en)
Inventor
Lars Gynt
Lennart Holm
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Linden Alimak AB
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Linden Alimak AB
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Publication date
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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

Definitions

  • the jib is formed of a plurality of detachably couplable modules each of which is formed of at least [30] Foreign Application Priority Data one upper and at least one lower member extending parallel to each other in the direction of the longitu- Jan. 27, 1970 Sweden ..978/70 dinal axis of the j
  • the longitudinal members of the respective modules all have the same spacing relative 2? 212/144 to each other so that all of the modules may be con I!
  • This invention relates to a hoisting crane adapted particularly for building purposes, comprising a freely projecting jib, which is mounted, for example, on a tower or a derrick and along which can be moved a carriage with a lifting means, which jib has a lattice structure and comprises at least one upper and at least one lower longitudinal frame rod.
  • a hoisting crane for building purposes usually comprises a tower carrying at its top end portion a horizontal jib.
  • the jib in its turn supports a carriage with a lifting tackle or lifting cables suspended thereon.
  • a carriage of this type being movable along the entire jib, the crane can cover a rectangular working range in a vertical plane.
  • the working ranges of the building cranes and, thereby, the length of the jibs have increased.
  • the lifting capacity becomes increasingly dependent on the dead weight of the jib.
  • the jibs are given a lattice structure, which in many cases is made of a high-grade structural steel.
  • a jib is supported by one or more stay members anchored at the outer half of the jib.
  • the other end of such a stay member usually extends beyond a breaking point located higher than the jib in the extension of the crane tower.
  • a second mounting for such a jib is provided at the connection to the crane tower.
  • .libs usually have a rectangular or triangular crosssection, with a frame rod placed at each joint of the cross-section.
  • the lower and upper frame rods are connected together by vertical rods and diagonal rods.
  • Lattice rods in a jib of known design are subjected also to alternating loads by both tensile and compressive forces, which at straining crane operations can cause breaks due to fatigue of the rod material. A number of such cases are known.
  • the center of gravity is placed closer to the slewing center than is possible with jibs of known design. Due to the construction of the jib, furthermore, the total surface exposed to wind load is smaller than in known building cranes. This involves, besides, advantages from a dimensioning point of view and improves the operating properties.
  • the jib furthermore, is so designed that it comprises a substantially reduced number of rods subjected to compressive forces. Every rod comprised in a jib according to the invention is subjected to only one type of load, either tension or compression, which implies a considerable reduction of the breaking risk resulting from fatigue of the material.
  • Tower cranes for building purposes are produced in series. It is conventional for the tower to be assembled of construction modules. Heretofore, it has not been possible to manufacture jibs in a corresponding way with modules, due to the reason that, in conventional jibs the loads on a jib, module located at the outer portion of a jib are different from those on a jib module located far inwardly on a jib.
  • One characterizing feature of the jib according to the invention is that it is supported entirely without outside stay members.
  • the invention renders possible good flexibility and adaptation to the market.
  • the cross-section subjected to the greatest load always is located at the mounting on the crane tower. Accordingly, the load in the cross-section only increases with the relation between the length of the entire jib after the extension and the length of the entire jib prior to the extension.
  • the invention further involves the advantage that the load moment switch, which must be found at all cranes of this kind, must not be reset after a change of the jib length. Consequently, no new inspection is required either.
  • the jib in its entirety being dimensioned so as to carry vertical loads without additional stay members, and this implies as a further achievement that the horizontal rigidity is improved substantially over that of known jibs.
  • the mounting time required for a building crane according to the invention is reduced considerably compared with known building cranes as no stay cables and top supports have to be mounted.
  • the hoisting crane according to the invention which is characterized in that the jib has no outside stay members and in its longitudinal direction is divided into a number of construction modules having different bearing capacity such that the bearing capacity increases from the free end of the jib inwardly, and that the different bearing capacities are obtained by different cross-sectional dimensions of at least one of the rods comprised in the modules.
  • FIG. 1 is a lateral view of a building crane with a jib assembled of construction modules
  • FIGS. 2, 3 and 4 are a lateral view, anend view and a view seen from above, respectively, of a construction module of which an entire jib can be assembled.
  • the building crane comprises a derrick 2 secured on a foundation 3, a slew base plate 4, a jib 5, which in this embodiment is assembled of five construction modules, a counterweight 6, hoisting machinery 7, a slewing machinery 8, a carriage 9, lifting hook 10, lifting cable 11, and carriage machinery 20.
  • a construction module comprises upper frame rods 12 and lower frame rods 13, connected together by rods 14 and 15 arranged perpendicularly to said frame rods and by diagonal rods 16 and 17.
  • the frame rods 12 and 13 as well as the rods 14, 15, 16 and 17 may be rolled sections or hollow bodies.
  • the upper and lower frame rods 12 and 13, respectively are shown to be square tubes, which may have square or rectangular cross-section.
  • One characterizing feature of a construction module is that all diagonal rods in a lateral projection (FIG. 2) have the same direction.
  • the drawing shows a construction module having rectangular cross section.
  • the invention allows also for applying construction modules with another cross-section, for example of triangular shape having a point turned upwardly or downwardly.
  • One prerequisite condition is that all diagonals in a lateral projection of the construction module have the same direction.
  • the upper frame rods 12 are provided with flanges 18 for connecting together the construction modules by bolts.
  • the lower frame rods 13 are provided with guide means comprising guide pins 19 for effecting centering within a frame rod of an adjacent construction module.
  • the mounting method for a jib according to the invention is simpler than that for conventional jibs because the lower frame rods only transfer compressive forces, so that connections in their usual meaning are not required. What is required is merely a means 19 for centering. This offers the further advantage that the lower frame rods on their outside are entirely smooth and thereby can serve as a runway for the carriage 9.
  • All construction modules for a jib have the same outer dimension, which is a prerequisite condition for production in series. It is thereby possible to utilize the same production line, the same welding fixtures and other equipment for all jib modules.
  • All construction modules are so manufactured and iiiiific' iiil'fhifi illit'is iiil'iifiiirlf' fi ciiiifi.
  • all rods comprise tubes or other hollow bodies, in which case different bearing capacity is obtained in that the outside or inside dimension for all rods of a certain kind is equal while the bearing capacity for different construction modules can be varied by choosing a varying material thickness for the rods.
  • a hoisting crane of the type comprising a horizontal jib pivotally mounted on a vertical tower and supporting thereon a movable carriage having a lifting means, the improvement which comprises:
  • said jib being formed of a plurality of detachably couplable modules each of which comprises at least one upper and at least one lower member which members extend parallel to each other in the direction of the longitudinal axis of the horizontal jib,
  • each jib-forming module in each of the respective modules of the jib all having the same spacing relative to each other so as to permit each jib-forming module to be constructed with the same dimensions in a common jib,
  • some of said jib-forming modules having their as sociated members formed with a greater material cross-section than that of the corresponding members of other of said modules so as to permit an increase in the load-carrying strength of the modules in a direction from the free end of the jib toward its pivotal mounting on said tower without varying the overall cross-sectional dimensions of the several modules forming a complete jib.
  • each module is formed of hollow tubes and corresponding tubes of the respectively difi'erent modules having different loadbearing capacity have the same outer dimension.
  • each module is formed of hollow tubes and corresponding tubes of the respectively different modules having different loadbearing capacity have the same inner dimension.
  • each said coupling means comprising coupling elements at the respective ends of the upper longitudinal members for providing a tension coupling therebetween and coupling elements for the respective ends of the lower longitudinal members which provide longitudinal alignment of the corresponding lower members.
  • a crane according to claim 1 characterized by a smooth transition between the lower members of the modules so that said rods can serve as a runway for the carriage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
US107076A 1970-01-27 1971-01-18 Hoisting crane Expired - Lifetime US3706285A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00978/70A SE337089B (fi) 1970-01-27 1970-01-27

Publications (1)

Publication Number Publication Date
US3706285A true US3706285A (en) 1972-12-19

Family

ID=20257402

Family Applications (1)

Application Number Title Priority Date Filing Date
US107076A Expired - Lifetime US3706285A (en) 1970-01-27 1971-01-18 Hoisting crane

Country Status (9)

Country Link
US (1) US3706285A (fi)
CA (1) CA945515A (fi)
CH (1) CH521920A (fi)
DE (1) DE2103667A1 (fi)
FI (1) FI49391C (fi)
FR (1) FR2077350B1 (fi)
GB (1) GB1310635A (fi)
NO (1) NO138902C (fi)
SE (1) SE337089B (fi)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851767A (en) * 1970-02-13 1974-12-03 Richier Sa Tower cranes
US4489659A (en) * 1979-01-10 1984-12-25 Hitachi, Ltd. Truss-type girder for supporting a movable body
WO2008006573A1 (de) * 2006-07-11 2008-01-17 Wolffkran Ag Verfahren zur montage eines turmkranes
WO2013014302A1 (es) * 2011-07-28 2013-01-31 Linden Comansa, S.L. Estructura de pluma-contrapluma para grúa torre sin tirantes
US20150071754A1 (en) * 2013-09-12 2015-03-12 The Boeing Company Method and Apparatus for Supporting an Aircraft Structure During Repair
CN113460895A (zh) * 2021-06-29 2021-10-01 徐州重型机械有限公司 一种变强度臂架
US11459217B2 (en) * 2017-09-01 2022-10-04 Liebherr-Werk Biberach Gmbh Rotary tower crane

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040387A3 (de) * 1980-05-16 1982-03-31 Khadem, Mustafa, Ing. grad. Kran
CA1179982A (en) * 1981-06-24 1984-12-27 Lembit Vaerk Boom extension for crane
DE3136102C2 (de) * 1981-09-11 1985-11-21 Mauer-Blitz Bau-Service GmbH, 4670 Lünen Kleinkran zum lagenweisen Vermauern von insbesondere großformatigen Mauersteinen
DE3246217A1 (de) * 1982-12-14 1984-06-14 Gottwald GmbH, 4000 Düsseldorf Gittermastausleger fuer einen auslegerkran
DE3926488A1 (de) * 1989-08-10 1991-02-14 Man Ghh Krantechnik Turmdrehkran
DE9107158U1 (de) * 1991-06-11 1991-07-25 Frank Abels Consulting & Technology GmbH, 3042 Munster Zerlegbarer und versetzbarer Kleinkran zum Einsatz auf Baustellen
ITMI20031503A1 (it) * 2003-07-22 2005-01-23 San Marco Internat S R L Gru a torre con braccio e controbraccio senza tiranti di sostegno

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335522A (en) * 1943-02-20 1943-11-30 Letourneau Inc Factory jib crane
US2575564A (en) * 1949-11-14 1951-11-20 Rinkel Silas Motor lift attachment
US3433459A (en) * 1967-05-02 1969-03-18 Federal Sign And Signal Corp Load handling apparatus
US3445004A (en) * 1967-02-01 1969-05-20 Bucyrus Erie Co Telescopic cantilevered boom

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1377553A (fr) * 1963-09-27 1964-11-06 Flèche à chariot pour grues
NL6617808A (fi) * 1966-12-19 1968-06-20
BE709986A (fi) * 1968-01-26 1968-05-30
GB1200578A (en) * 1969-05-19 1970-07-29 Edilmac Spa Improvements in or relating to jib cranes provided with load carriages

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2335522A (en) * 1943-02-20 1943-11-30 Letourneau Inc Factory jib crane
US2575564A (en) * 1949-11-14 1951-11-20 Rinkel Silas Motor lift attachment
US3445004A (en) * 1967-02-01 1969-05-20 Bucyrus Erie Co Telescopic cantilevered boom
US3433459A (en) * 1967-05-02 1969-03-18 Federal Sign And Signal Corp Load handling apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851767A (en) * 1970-02-13 1974-12-03 Richier Sa Tower cranes
US4489659A (en) * 1979-01-10 1984-12-25 Hitachi, Ltd. Truss-type girder for supporting a movable body
WO2008006573A1 (de) * 2006-07-11 2008-01-17 Wolffkran Ag Verfahren zur montage eines turmkranes
WO2013014302A1 (es) * 2011-07-28 2013-01-31 Linden Comansa, S.L. Estructura de pluma-contrapluma para grúa torre sin tirantes
ES2397325A1 (es) * 2011-07-28 2013-03-06 Linden Comansa, S.L. Estructura de pluma-contrapluma para grúa torre sin tirantes.
US20150071754A1 (en) * 2013-09-12 2015-03-12 The Boeing Company Method and Apparatus for Supporting an Aircraft Structure During Repair
US9096331B2 (en) * 2013-09-12 2015-08-04 The Boeing Company Method and apparatus for supporting an aircraft structure during repair
US11459217B2 (en) * 2017-09-01 2022-10-04 Liebherr-Werk Biberach Gmbh Rotary tower crane
CN113460895A (zh) * 2021-06-29 2021-10-01 徐州重型机械有限公司 一种变强度臂架

Also Published As

Publication number Publication date
SE337089B (fi) 1971-07-26
FR2077350A1 (fi) 1971-10-22
FI49391B (fi) 1975-02-28
GB1310635A (en) 1973-03-21
DE2103667A1 (de) 1971-08-05
FR2077350B1 (fi) 1974-02-22
NO138902C (no) 1978-12-06
FI49391C (fi) 1975-06-10
NO138902B (no) 1978-08-28
CA945515A (en) 1974-04-16
CH521920A (de) 1972-04-30

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