US3684104A - Twin-type slewing crane - Google Patents

Twin-type slewing crane Download PDF

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Publication number
US3684104A
US3684104A US112282A US3684104DA US3684104A US 3684104 A US3684104 A US 3684104A US 112282 A US112282 A US 112282A US 3684104D A US3684104D A US 3684104DA US 3684104 A US3684104 A US 3684104A
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Prior art keywords
twin
winches
base
boom
mast
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Expired - Lifetime
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US112282A
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English (en)
Inventor
Masao Oda
Noriaki Kijima
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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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
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/52—Floating cranes
    • B66C23/525—Double slewing cranes on ships

Definitions

  • a twin-type slewing crane includes a base rotatably mounted on an upright support which may be posi- Aug. 15, 1972 tioned, for example, between two holds of a vessel, and driving means for rotating the base about the support.
  • Two upright columns or masts are mounted on the support adjacent opposite ends of a diameter thereof.
  • Each mast is embraced by an annular bearing each of which pivotally mounts a respective jib or boom for swinging movement in a vertical plane, and respective driving means are associated with each annular bearing to swing the associated boom around the axis of the respective mast.
  • a pair of elevating winches are mounted in axial alignment on the base between the masts, and each connected by cables, trained over pulleys mounted on the associated mast, to the respective booms to raise and lower the booms.
  • a pair of winding winches are also mounted in axial alignment on the base and connected by cables, again trained over pulleys mounted on the associated mast and on the outer end of the associated boom, to lifting hooks or the like.
  • Respective clutch means are provided for each pair of winches so that the elevating winches may be interconnected to operate in synchronism and also the winding winches may be interconnected, to operate in synchronism. Such synchronized operation is utilized when the two booms are swung into substantially parallel relation with each other to act as a twin crane in lifting very heavy loads.
  • Certain of the pulleys may be mounted on a member interconnecting the two masts near the upper ends thereof.
  • the booms are raised and lowered by hydraulic actuators which are connected to sources of hydraulic fluid under pressure through valve means w lCl'l permit independent operation of each hydraulic actuator, in a parallel arrangement, or synchronized operation of the two hydraulic actuators, connected in series relation.
  • each of the two individual cranes is provided I with its own winding jib and elevating winches, and also with a swivelling winch, the wiring and piping become extremely complicated and maintenance and inspection become inconvenient and time consuming.
  • the maintenance of synchronism between the individual cranes which is most important in the conjoint use of the individual cranes as a twin-type slewing crane, becomes highly complicated and difficult to attain. Therefore, the difficulties involved in conjoint operation of the 'two cranes as a twin crane become an obstacle to efficient operation of such known twin-type slewing cranes, and they are accordingly less attractive industrially because of the increased costs resulting from such obstacles.
  • This invention relates to twin-type slewing cranes and, more particularly, to a twin-type slewing crane free of the disadvantages of prior art twin-type slewing cranes and with which synchronized conjoint operation of two individual cranes, when operating as a twin crane, can be easily attained and maintained.
  • a common swivel mount or base is rotatably mounted on a mounting base or support on a water-borne .vessel, and two upright posts or masts are secured to, or integral with, the common swivel mount to extend upwardly therefrom at diametrically opposite symmetrical locations.
  • a driving means is provided to rotate the swivel mount about its support. Near its lower end, each mast is embraced by an annular bearing which pivotally supports a respective boom or jib for swinging movement in a vertical plane, and respective driving means are operable to swing each boom or jib about its associated mast.
  • a pair of hoisting winches are mounted on the common swivel mount and are connected by cables, trained over pulleys, to the hoisting hooks or the like of each crane, and a pair of jib elevating winches are also mounted on the common swivel mount and connected by cables, trained over pulleys, to the respective booms or jibs for raising and lowering the same.
  • the two hoisting winches may be interconnected by suitable clutch means for conjoint operation, and the two elevating winches likewise may be interconnected by clutch means for conjoint operation.
  • the two hoisting winches are arranged in axial alignment with each other, as are also the two hoisting winches.
  • the individual cranes may be independently operated both in elevation and in traverse.
  • the two jibs or booms are swung into substantially parallel relation, and the two clutch means are operated to interconnect the two winding winches and to interconnect the two hoisting winches, whereby the two individual cranes are conjointly operated as a twin-type crane.
  • the elevating winches may be replaced by hydraulic actuators each connected between a mast and its associated jib or broom to raise and lower the associated jib or boom.
  • These hydraulic actuators are connected, by suitable selecting valves, to sources of hydraulic fluid under pressure, whereby the hydraulic actuators may be operated independently of each other, in parallel, or conjointly with each other, by being connected in series.
  • An object of the invention is to provide a twin-type slewing crane free of the disadvantages of the prior art and with which synchronized operation of two individual cranes, with maintenance of synchronism, can be effected easily when the cranes are used as a twin crane.
  • Another object of the invention isto provide an improved twin-type crane capable of loading and unloading operations with high efficieney in handling cargo ranging from a light load to a heavy load.
  • a further object of the invention is to provide such a twin-type slewing crane in which the individual cranes are mounted on a common swivel base which is rotatably supported on a suitable mounting means.
  • a further object of the invention is to provide such a twin-type slewing crane which may be adapted for operation either by mechanical winches or by hydraulic actuators.
  • FIG. 1 is a front elevational view of one form of twintype slewing crane embodying the invention and illustrating the cranes as arranged for individual operation;
  • FIG 2 is a plan view of the crane shown in FIG. 1;
  • FIG. 3 is a plan view of the crane shown in FIG. 1 as arranged for operation as a twin-type slewing crane;
  • FIG. 4 is an axial sectional view of the lower portion of the crane shown in FIG. 1, illustrating details of the driving arrangements;
  • FIG. 5 is a view, similar to FIG. 1, illustrating the crane masts as interconnected adjacent their upper ends;
  • FIG. 6 is a front elevation view of a twin-type slewing crane forming another embodiment of the invention and in which vertical swinging movement of the booms or jibs is effected by hydraulic actuators;
  • FIG. 7 is a hydraulic circuit diagram pertaining to the crane shown in FIG. 6.
  • reference numeral l designates a common mount or base which is rotatably mounted on a fixed base or support 3 of a ship, and has two posts or mast 2, and 2 fixedly mounted thereon or integral therewith.
  • the mounting positions of the posts 2 and 2' are diametrically symmetrical with respect to the center of mounting base 3.
  • Reference numerals 4 and 4' designate jibs or booms connected to the respective posts 2 and 2' for swinging motion thereabout.
  • Elevating switches 5 and 5 for elevating the respective jibs 4 and 4', two single crane swinging mechanisms 6 and 6' for swinging the respective jibs 4 and 4' and two winding winches 8 and 8' for moving respective weights or hooks 7 and 7 upwardly and downwardly, are mounted on the common mount or base 1.
  • Mounting base or support 3 is fixed on the hull of the ship between two hatches 9 and 9, and has a turntable bearing 10 provided thereon.
  • the structure on and above the common swivel base 1 is rotatable as a unit, and a rotation mechanism 1 l for twin operation, is mounted within the common base 1.
  • Respective annular bearings 12 and 12' embrace posts 2 and 2 for single operation, with the inner race 13 of each bearing 12, 12' being fixed on the respective post 2, 2', while the outer race 14 thereof is integral with a large ring gear 15 meshing with the pinion 16 of the associated swinging mechanism 6 or 6'.
  • a respective jib-mounting housing 23 is secured to each outer race 14, so that the outer race 14 and the associated jib are moved as a unit. With such an arrangement, the upsetting moment is taken entirely by the associated post 2 or 2.
  • the arrangement of the respective winches is as shown in FIG. 2.
  • the two winding winches 8, 8' and two jib elevating winches 5, 5' are arranged between the posts 2 and 2 in such a manner that the drums of the respective winding winches are axially aligned as are also the drums of the respective elevating winches.
  • Respective clutches 17, 17 are provided between the winches of each axially aligned pair so that two drums may be coupled together for conjoint synchronized operation.
  • the wires or cables of winding winches 8, 8' extend into the interior of the associated posts or mast 2, 2' over pulleys 18, 18', at intermediate portions of the posts, and pulleys 19, 19', within the posts, and reach pulleys 21, 21', at the tip ends of the respective jibs, over pulleys 20, 20' at the top ends of the associated posts, to move the associated weights or hooks 7, 7 up and down.
  • the pulleys 20, 20', at the top ends of the posts, and the pulleys 21, 21 at the tips of the jibs, are provided in a plural number, so that the weights 7, 7 may be moved horizontally independently of the vertical movement of thejibs 4, 4'.
  • the wires or cables of the jib elevating winches 5, 5' extend into interiors centers of the posts 2, 2' through the pulleys 18, 18' and the pulleys 19, 19' and reach the tips of the jibs 4, 4 over the pulleys 20, 20', to swing the jibs 4, 4 up and down.
  • the pulleys 20, 20 at the top ends of the respective posts or mast swivel about the posts 2, 2 following the movements of the associated jibs 4, 4.
  • the twin operation swivel mechanism 11 when the single cranes are operated individually, the twin operation swivel mechanism 11 is held inoperative and the clutches for the winding winches 8, 8' and for the jib elevating winches 5, 5' are disconnected, so that the respective winches may be operated individually.
  • the hoisting and lowering of weights 7, 7' are effected by the cables which are led to the winding winches 8, 8' over the pulleys 21, 21 at the tip end of the jibs, the pulleys 20, 20' at the top ends of the posts, the pulleys 19, 19' within the posts and the pulleys 18, 18' at intermediate portions of the posts.
  • the jibs 4, 4 When the crane is operated as a twin crane, the jibs 4, 4 are positioned in substantially parallel relation as shown in FIG. 3, with the top or outer ends being located at the same level, and clutches 17, 17' are placed in an engaged position. By so doing, it becomes possible to operate winding winches 8, 8 and jib elevating winches 5, 5' in positive synchronism.
  • the hoisting and lowering of weights 7, 7 and jibs 4, 4 are effected in the same manner as in the case of single operation, but the single operation swivel mechanisms 6, 6' are fixed by a brake and all of the structure on above common swivel mount or base 1 is rotated about mounting base or support 3 by means of twin operation swivel mechanism 1 1.
  • winding winches 8, 8', jib elevating winches 5, S'and single operation swivel mechanisms 6, 6 are all mounted on common swivel mount 1, the construction is simple and maintenance can be effected advantageously.
  • the synchronous operation of the single cranes which is most important in the twin operation, can be attained simply and positively by engaging clutches 17, 17' of winding winches 8, 8 and jib elevating winches 5, 5, and there is no need of a synchronous operation correcting means.
  • pulleys 20, 20' at the top ends of the posts are rotatable about the respective posts 2, 2', the cables from winding winches 8, 8' and jib elevating winches 5, 5 can be handled smoothly.
  • FIG. 5 differs from that shown in FIGS. 1 through 4 only in that the masts 2 and 2' are interconnected, adjacent their upper ends, by a common support for the pulleys 18, 18' and 19, 19'.
  • FIGS. 6 and 7 hoisting and lowering of jibs 4, 4' are effected by hydraulic actuators 22, 22', instead of by cables and elevating winches.
  • the correction of synchronism of the jib elevating mechanisms is effected by switching the respective hydraulic circuits from series connection to parallel connection or vice versa.
  • Tandem-type hydraulic pumps 25, 25, driven from an electric motor 24, are individually connected to hydraulic actuators 22, 22' through separate conduits, with control valves 26, 26' and change-over valves 27, 27 being interposed in the respective conduits (see Fig. 7).
  • FIG. 7 shows valves 27, 27' in the state wherein the single cranes are used individually.
  • changeover valves 27, 27 are shifted, whereby fluid from hydraulic pump 25 enters the hydraulic actuator 22 through control valve 26, and flows from hydraulic actuator 22 through change-over valve 27 to actuator 22.
  • the fluid returns through change-over valve 27 and control valve 26 to hydraulic pump 25. Therefore, the hydraulic actuators 22, 22' make exactly the same stroke.
  • the fluid from the hydraulic pump 25' returns directly to the hydraulic pump 25' through the control valve 26'.
  • the hydraulic parts used in this embodiment are all mounted within the common swivel mount ll, except for the actuators 22, 22'.
  • the hoisting and lowering of weights 7, 7' are effected by the cables led to winding winches 8, 8' over pulleys 21, 21' at the top ends of the jibs, pulleys 20, 20' at the top ends of the posts, pulleys 19, 19' within the posts and pulleys l8, 18 at intermediate portions of the posts.
  • Hoisting and lowering of the jibs 4, 4' are effected by the hydraulic actuators 22, 22.
  • Horizontal movement or traverse of jibs 4i, 4' is effected by swinging them about the respective posts 2, 2', to load or unload cargoes into or from the two hatches 9, 9'.
  • the synchronous operation in the use of the crane as twin crane, can also be achieved simply and positively, by the connection of clutch 17, for the two winding winches 8; 8, and the shifting of the change-over valves 27, 27','for the jib elevating hydraulic actuators 22, 22, and there is no need of a synchronous operation correcting means.
  • winding winches 8, 8' and single operation swivel mechanisms 6, 6' are mounted on the common swivel mount, and the twin operation swivel mechanism 11 and the jib elevating power means (the electric motor 24, the hydraulic pumps 25, 25', the controlling valves 26, 26 and the change-over valves 27, 27') are also mounted in the common swivel mount 1, the construction is simple and maintenance can be advantageously effected.
  • actuators 22, 22 are used for the jib elevating mechanism, there is no fear of jibs 4, 4' dropping due to breakage of cables, and further the jackknife phenomenon (the phenomenon in which a warping force acts on the crane in the erected state of the jibs 4, d) can be avoided.
  • a twintype slewing crane comprising, in combination, a common base mounted for rotation about an upright axis; a pair of relatively elongated upright masts supported on said base in spaced parallel relation to each other; respective booms mounted on said masts for swinging movement in their vertical plane and for rotational traverse about the associated mast, each boom supporting a respective hoisting hook for lifting and lowering loads; individually operable hoisting winches on said base each connected by a respective cable to a respective hook; individually operable boom elevating mechanisms on said base each connected to a respective boom to raise and lower the latter; individually operable drive means on said base each operable to rotate a respective boom about its associated mast; driving means operable to rotate said base, together with all of the components mounted thereon, about said upright axis; first coupling means selectively operable to interconnect said winches for conjoint synchronized operation; and second coupling means selectively operable to interconnect said elevating mechanisms for conjoint synchronized operation; whereby said booms and hooks may be operated independently for handling individual loads,
  • a twin-type slewing crane as claimed in claim 1, in which said boom elevating mechanisms comprise individually operable elevating winches on said base each connected by a respective cable to a respective boom.
  • a twin-type slewing crane as claimed in claim 2, in which said first and second coupling means comprise respective clutches.
  • a twin-type slewing crane as claimed in claim 3, in which said hoisting winches are axially aligned with each other and said elevating winches are axially aligned with each other.
  • a twin-type slewing crane as claimed in claim 2, including pulleys mounted internally of each mast; said cables being craned over said pulleys.
  • a twin-type slewing crane as claimed in claim 2, including a support interconnecting said masts near their upper end; and pulleys on said support; said cables being craned over said pulleys.
  • a twin-type slewing crane as claimed in claim 1, in which said boom elevating mechanisms comprise individually operable hydraulic actuators each connected between a mast and the associated boom; means on said common base providing a supply of hydraulic fluid under pressure; respective lines connecting said lastnamed means to said actuators; respective control valves interposed in each supply line; and respective selector valves interposed in said supply lines and selectively operable either to connect the associated control valve to the respective hydraulic actuator or to connect both actuators in series with one control valve.
  • a twin-type slewing crane as claimed in claim 1, including a support rotatably mounting said common base; said driving means including a ring gear secured to said support and a motor mounted on said common base and having an output pinion engaged with said ring gear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US112282A 1970-05-15 1971-02-03 Twin-type slewing crane Expired - Lifetime US3684104A (en)

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US (1) US3684104A (OSRAM)
DE (1) DE2062626A1 (OSRAM)
FR (1) FR2070069B1 (OSRAM)
GB (1) GB1270207A (OSRAM)
NL (1) NL7017562A (OSRAM)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814264A (en) * 1972-06-06 1974-06-04 Orenstein & Koppel Ag Double slewing crane construction
US4187949A (en) * 1978-07-10 1980-02-12 Kawasaki Jukogyo Kabushiki Kaisha Derrick crane with wide horizontal swinging range of boom
US4197953A (en) * 1974-10-08 1980-04-15 Orenstein & Koppel Ag Double slewing crane construction
US4201305A (en) * 1973-10-27 1980-05-06 Orenstein & Koppel Aktiengesellschaft Rotatory crane with plural jibs
US4519741A (en) * 1982-01-04 1985-05-28 Ormig S.P.A. Mobile yard crane for handling containers
US5018630A (en) * 1988-11-21 1991-05-28 Mcghie James R High-capacity lift crane assembly
US5931321A (en) * 1998-03-31 1999-08-03 Grant; Robert K. Crane mechanism
US6316847B1 (en) * 1999-11-12 2001-11-13 John D. Crockett Winch control for basketball backstops
US20090301983A1 (en) * 2005-05-20 2009-12-10 Johnny Lorgen Crane for handling of chains,wires,etc., and tools for same
CN101332962B (zh) * 2008-05-14 2010-04-14 何富荣 水力插板平衡吊机
KR101363260B1 (ko) 2012-05-22 2014-02-13 한국기계연구원 두 개 아암의 폭이 가변 가능한 이동식 곤도라 행거
KR101382235B1 (ko) * 2013-04-03 2014-04-08 김윤호 덮개를 구비한 승하강식 곤돌라
US11174135B1 (en) 2020-10-23 2021-11-16 John Alan Bjorback Combination crane and methods of use
CN114084811A (zh) * 2021-11-25 2022-02-25 中国南方电网有限责任公司超高压输电公司柳州局 均压环安装方法及吊装辅助装置
US11731862B2 (en) 2020-10-23 2023-08-22 Kraniac, Inc. Combination crane and methods of use

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2966615D1 (en) * 1978-10-06 1984-03-08 Normar As Combination crane
FR2464914A1 (fr) * 1979-09-07 1981-03-20 Brissonneau & Lotz Dispositif d'asservissement de la position et de la vitesse relatives des tetes des deux fleches d'une grue pivotante double
US4524875A (en) * 1981-10-15 1985-06-25 Vickers P.L.C. Derrick crane
CN102992204A (zh) * 2012-10-24 2013-03-27 中船华南船舶机械有限公司 双体甲板起重机
CN103640994A (zh) * 2013-11-25 2014-03-19 无锡起岸重工机械有限公司 船用双拼克令吊
CN111874816A (zh) * 2020-06-19 2020-11-03 太重（天津）重型装备科技开发有限公司 起重机臂架及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891796A (en) * 1907-11-04 1908-06-23 Charles Cooper Steel derrick and excavating-machine.
US1439047A (en) * 1921-08-02 1922-12-19 Truman A Wood Hoisting and straw-conveying machine
DE1166433B (de) * 1960-12-23 1964-03-26 Miag Muehlenbau & Ind Gmbh Vorrichtung zur Anlenkung eines Greifers am Ausleger
US3228534A (en) * 1961-12-16 1966-01-11 Thaeter Hans Crane arrangement for use on board a ship

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191014580A (en) * 1910-06-16 1911-03-30 Armstrong W G Whitworth & Co Improvements in Cranes.
FR1484598A (fr) * 1966-06-27 1967-06-09 Orenstein & Koppel Ag Grue pivotante double
NL6703998A (OSRAM) * 1967-03-16 1968-09-17
NL6714428A (OSRAM) * 1967-10-24 1969-04-28

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891796A (en) * 1907-11-04 1908-06-23 Charles Cooper Steel derrick and excavating-machine.
US1439047A (en) * 1921-08-02 1922-12-19 Truman A Wood Hoisting and straw-conveying machine
DE1166433B (de) * 1960-12-23 1964-03-26 Miag Muehlenbau & Ind Gmbh Vorrichtung zur Anlenkung eines Greifers am Ausleger
US3228534A (en) * 1961-12-16 1966-01-11 Thaeter Hans Crane arrangement for use on board a ship

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814264A (en) * 1972-06-06 1974-06-04 Orenstein & Koppel Ag Double slewing crane construction
US4201305A (en) * 1973-10-27 1980-05-06 Orenstein & Koppel Aktiengesellschaft Rotatory crane with plural jibs
US4197953A (en) * 1974-10-08 1980-04-15 Orenstein & Koppel Ag Double slewing crane construction
US4187949A (en) * 1978-07-10 1980-02-12 Kawasaki Jukogyo Kabushiki Kaisha Derrick crane with wide horizontal swinging range of boom
US4519741A (en) * 1982-01-04 1985-05-28 Ormig S.P.A. Mobile yard crane for handling containers
US5018630A (en) * 1988-11-21 1991-05-28 Mcghie James R High-capacity lift crane assembly
US5931321A (en) * 1998-03-31 1999-08-03 Grant; Robert K. Crane mechanism
US6316847B1 (en) * 1999-11-12 2001-11-13 John D. Crockett Winch control for basketball backstops
US20090301983A1 (en) * 2005-05-20 2009-12-10 Johnny Lorgen Crane for handling of chains,wires,etc., and tools for same
CN101332962B (zh) * 2008-05-14 2010-04-14 何富荣 水力插板平衡吊机
KR101363260B1 (ko) 2012-05-22 2014-02-13 한국기계연구원 두 개 아암의 폭이 가변 가능한 이동식 곤도라 행거
KR101382235B1 (ko) * 2013-04-03 2014-04-08 김윤호 덮개를 구비한 승하강식 곤돌라
US11174135B1 (en) 2020-10-23 2021-11-16 John Alan Bjorback Combination crane and methods of use
US11731862B2 (en) 2020-10-23 2023-08-22 Kraniac, Inc. Combination crane and methods of use
US12017892B2 (en) 2020-10-23 2024-06-25 Kraniac, Inc. Combination crane and methods of use
US12486146B2 (en) 2020-10-23 2025-12-02 Kraniac, Inc. Combination crane and methods of use
CN114084811A (zh) * 2021-11-25 2022-02-25 中国南方电网有限责任公司超高压输电公司柳州局 均压环安装方法及吊装辅助装置

Also Published As

Publication number Publication date
FR2070069B1 (OSRAM) 1973-12-28
NL7017562A (OSRAM) 1971-11-17
DE2062626A1 (de) 1971-11-18
FR2070069A1 (OSRAM) 1971-09-10
GB1270207A (en) 1972-04-12

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