US3921815A - Crane with a suspended rotatable counterbalance - Google Patents

Crane with a suspended rotatable counterbalance Download PDF

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Publication number
US3921815A
US3921815A US466628A US46662874A US3921815A US 3921815 A US3921815 A US 3921815A US 466628 A US466628 A US 466628A US 46662874 A US46662874 A US 46662874A US 3921815 A US3921815 A US 3921815A
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US
United States
Prior art keywords
counterweight
deck
respect
pedestal
crane
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
US466628A
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English (en)
Inventor
Archer W Brown
Talford S Decuir
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.)
AMERICAN CRANE Corp A CORP OF
Original Assignee
American Hoist and Derrick Co
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 American Hoist and Derrick Co filed Critical American Hoist and Derrick Co
Priority to US466628A priority Critical patent/US3921815A/en
Priority to GB1546875A priority patent/GB1470019A/en
Priority to SE7504499A priority patent/SE404173B/xx
Priority to CA225,280A priority patent/CA1010412A/en
Priority to DE19752518613 priority patent/DE2518613A1/de
Priority to FR7513612A priority patent/FR2269486B1/fr
Priority to NO751582A priority patent/NO140762C/no
Application granted granted Critical
Publication of US3921815A publication Critical patent/US3921815A/en
Assigned to AMERICAN CRANE CORPORATION, THE, A CORP. OF NC reassignment AMERICAN CRANE CORPORATION, THE, A CORP. OF NC ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN HOIST & DERRICK COMPANY, A CORP. OF DE
Assigned to STAR BANK, NATIONAL ASSOCIATION, CINCINNATI reassignment STAR BANK, NATIONAL ASSOCIATION, CINCINNATI SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN CRANE CORPORATION, THE A CORP. OF NORTH CAROLINA
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/74—Counterweights or supports for balancing lifting couples separate from jib
    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling

Definitions

  • ABSTRACT A machinery deck of a counterbalancing crane is rotatably mounted on a vertical axis on an upstanding pedestal in an offshore location.
  • An upwardly directed boom and an upwardly directed mast are pivotally mounted with respect to a forward portion of this deck for movement in a vertical plane passing through the axis of rotation of the deck with respect to the pedestal.
  • a counterweight tank filled with sea water is pinned to the underside of a rearward portion of the deck intermediate the outermost end of the rear portion and the vertical axis of deck rotation.
  • Counterweight support wheels are rotatably mounted on verti' cal axes with respect to a bottom portion of the counterweight; and a cylindrical counterweight support collar is supported on the pedestal in concentric relation to the axis of deck rotation and in position to receive counterweight wheels.
  • a suspension between an upper part of the mast and an upper part of the boom and a suspension between the counterweight and an upper part of the mast permits the counterweight to act in a counterbalancing mode with respect to a load suspended from a load line supported from the point of the boom.
  • a bearing platform is provided by the counterweight to be in underlying relation to the outermost rear end portion of the machinery deck so that as the entire counterbalancing effect of the counterweight has been utilized and a counterweight tends to lift its wheels away from the counterweight support collar, the upward force on it is transmitted through this bearing platform to the outermost rear end portion of the machinery deck.
  • This invention has relation to counterbalancing cranes of the pedestal type.
  • Such cranes are used for handling cargo from seagoing vessels to floating platforms or to fixed platforms mounted on the sea bottom. They find particular usefulness in offshore oil drilling operations, for example.
  • a machinery deck of a counterbalancing crane is rotatably mounted with respect to an upstanding pedestal or other support.
  • This support can be a pedestal fixed to the sea floor or to a floating barge in an offshore location; or can be a carbody or the like temporarily or permanently fixed to the ground.
  • a n upwardly directed boom and an upwardly directed ,mast are pivotally mounted with respect to a forward portion of this machinery deck for movement in a vertical plane passing. through the axis of rotation of the deck with respect to the support.
  • a counterweight is pivotally mounted with respect to the deck on a horizontal axis perpendicular to this vertical plane, in such a manner that rotation of the deck on its vertical axis will cause rotation of the counterweight about the same vertical axis.
  • a first suspension means connects an upper portion of the mast with an upper portion of the boom, a second suspension means connects the counterweight with an upper portion of the mast, a load line extends over the point of the boom to connect to a load handling device, means is provided for rotating the deck, and means is provided for spooling the load line.
  • a counterweight load bearing entity is provided with a counterweight load bearing surface, and counterweight support means are provided for supporting a portion of the counterweight in load bearing relationship to such load bearing surface when the load line, the mast, the boom, the first suspension means and the second suspension means are not supporting a maximum load.
  • Said counterweight support means is such as to permit the counterweight to rotate horizontally with the deck and with respect to saidpedestal or other support.
  • Cooperating bearing means are provided between the counterweight and a rearward end portion of the machinery deck for transmitting upward forces on the counterweight to said rear end portion of said deck when the load on said load line causes the second sus pension means to lift the weight of the counterweight from the counterweight supporting entity.
  • the counterweight load bearing entity is constituted as a cylindrical, horizontally disposed, counterweight support collar mounted on a pedestal to be concentric with the axis of machinery deck rotation; and the counterweight support means includes wheels rotatably mounted on vertical axes with respect to a lower portion of the counterweight.
  • the cooperating bearing means includes a bearing platform constituted as an integral part of the counterweight in underlying vertically aligned relationship to an integral outermost rearward end portion of the machinery deck. Also as disclosed herein, shims are provided between this outermost portion of the deck and the counterweight bearing platform so that any upward movement of the counterweight will be immediately transmitted to the rearward end portion of the deck.
  • the point of pivotal mounting of the counterweight with respect to the deck is located between the vertical axis of rotation of the deck with respect to the pedestal and the outermost rearward end portion of the deck.
  • the counterweight is constituted as a hollow tank which can be filled with sea water, for example.
  • FIG. 1 is a side elevational view of an offshore counterbalancing crane of the invention showing a pedestal mounted to this sea floor;
  • FIG. 2 is an enlarged horizontal sectional view taken generally on the line 22 in FIG. I;
  • FIG. 3 is a fragmentary vertical sectional view taken generally on the line 33 in FIG. 2 and at a somewhat reduced scale but showing the pedestal mounted on a floating barge.
  • An offshore counterbalancing crane 10 includes a cylindrical pedestal l2 permanently fixedly mounted in the sea floor 14 on a floating barge 15, in any usual or preferred manner, and a machinery deck 16 rotatably 3 mounted on the pedestal 12.
  • a boom 18 is pivotally mounted to a forward portion 20 of the machinery deck 16, as is a mast 22.
  • a counterweight 24 includes a counterweight tank 26 filled, for example, with sea water 28. This counterweight is pivotally mounted or pinned as at 30 to a rearward portion 32 of the machinery deck 16 through the instrumcntality of a downwardly extending strut 34 and a generally horizontally extending strut 36. These struts are pinned to the counterweight at 38 and 40 respectively.
  • a first linkage or suspension 44 is connected between the tip of the mast 22 and the point of the boom 18. As shown, this first suspension is adjustable in length by operating appropriate machinery 45 on the machinery deck 16, to lengthen and shorten the distance between the sheaves 46, 46 due to lengthening and shortening of first suspension control line 48.
  • a second linkage or suspension 42 is connected between an upper portion of the counterweight tank 26 as at 43, and the top of the mast 22 as at 41.
  • a load line, or load lines 50 pass over a sheave at the point of the boom 18 and are connected to load handling devices such as load hooks 52.
  • Machinery 54 is provided, on the machinery deck as shown, for controlling the length of the load lines. Machinery 45 and 54 can be of any usual or preferred construction and can be located at any convenient place just so long as the control line 48 passes to the sheaves 46 and the load line 50 passes over the boom point.
  • a shock absorbing boom stop 56 is pivotally mounted to the machinery deck and to the boom 18 to prevent movement of the boom to a position where it would have a tendency to fall toward the rearward portion of the machinery deck.
  • the rotatable mounting of the machinery deck 16 to the pedestal 12 can be accomplished, as best seen in FIG. 3, by providing a combination bull gear and roller path 58 as the top cap of the pedestal.
  • a bull gear center pin 59 extends integrally upwardly therefrom.
  • a bull gear center pin bushing 60 fits over pin 59 and is constituted as an integral part of machinery deck structure, as are load roller and hook roller brackets 62, 62.
  • Load rollers 64 are rotatably mounted on the brackets 62 to support the machinery deck on a roller path flange 66 of the combination bull gear and roller path 58.
  • Hook rollers 68 are rotatably mounted on these brackets 62, run on the bottom side of flange 66, and serve to resist any upward forces exerted by the machinery deck on the flange.
  • Other equally suitable means of rotatably mounting the deck to the pedestal could be employed without departing from the spirit or scope of the invention.
  • a counterweight load bearing entity 70 includes, in the form of the invention as shown, a cylindrical counterweight support collar 72 integrally supported on the cylindrical pedestal 12 in concentric relationship to it and to the vertical axis of the bull gear and roller path 58 as by horizontally outwardly extending plates or flanges 74, 74.
  • Counterweight support means 76 includes counterweight support wheels 78 each rotatably mounted on a vertically disposed axle 80 which, in turn, are supported in horizontally disposed wheel beams 82. These wheel beams are pivotally mounted as at 83 to counterweight wheel brackets 84 which are integral with and extend outwardly from a lower portion of counterweight tank 26.
  • Counterweight tank 26 is also provided with a bearing platform 86 which is in vertical alignment immediately under an outermost rearward end deck bracket 88 integral with the outermost end of the rearward portion 32 of machinery deck 16. With the parts positioned as seen in FIGS. 1 and 3, one or more metallic shims 90 are situated between and in contact with the platform 86 and the bracket 88 to insure that any upward movement whatever of counterweight tank 26, and consequently bearing platform 86, is directly transmitted to the outermost end of the rearward portion 32 of the machinery deck 16 through the bracket 88.
  • a drive pinion downwardly extending from the machinery deck 16 into the interior of the bull gear 58, meshes with this bull gear.
  • power means are provided to turn the pinion on its axis, thus to cause the machinery deck 16 to rotate relative to the bull gear and roller path combination 58.
  • Means for rotating the machinery deck with respect to the pedestal are not specifically shown, as this can be accomplished in any usual or preferred manner, forming no part of the present invention.
  • the struts 34 and 36 will cause the counterweight 24 to turn with the check. This will cause the wheels 78 to roll around the outer periphery of the cylindrical counterweight support collar 72.
  • the downward component of the weight of the counterweight will be carried by the machinery deck at the pin 30. This pin 30 is spaced relatively close to the axis of rotation of the deck, thus creating much less bending moment than would be the case if it were supported at the outermost rear end portion of the deck 16.
  • the maximum vertical dead weight effect of the counterweight acts at a lever arm lengthequal to the horizontal distance between the pin 30 and the vertical axis of rotation of the machinery deck 16. Since this is the maximum rearward bending stress condition, and since it is present under minimum or no load conditions only, the various elements of the counterbalancing crane are easily designed to safely handle such loading.
  • This no load condition is also the condition of maximum normal stress of the counterweight 24 acting through the counterweight support means 76 and onto the pedestal mounted cylindrical counterweight support collar 72. Because the cylindrical wall of collar 72 is vertical, there is no component of force transmitted in the downward direction through the support collar 72 and onto the pedestal 12. The only force here in volved is that in direction perpendicular to the axis of the support collar and lying in a generally horizontal plane. Thus by providing sufficient rigidity and stiffness in the pedestal and in the pedestal support collar and in the radially outwardly extending plates 74, 74 which support the collar on the pedestal to support a known maximum force, safe and economical design is readily achieved.
  • the boom 18 When one of the load hooks 52 is engaged with a working load, and machinery 54 is employed to reel in the load line 50 so that the crane can lift that load, the boom 18 is positioned or maintained in its upright position through the first suspension 44 and by the connection of that first suspension to the tip of the mast 22.
  • the mast, first suspension, boom, the load hooks 52 and the work load (not shown) are supported in place by the second suspension 42, connected as it is between the top of the counterweight 24 and tip of mast 22.
  • the upward forces existing in second suspension 42 are increased.
  • the downward force component on the pin 30 is lessened, and the horizontal force component through the counterweight wheels 78 to the cylindrical counterweight support collar 72 is likewise lessened.
  • This loading of the machinery deck toward the rear approaches and reaches a minimum as the load is picked up, and then passes to a maximum tending to load the front end of the machinery deck as the entire weight of the counterweight is picked up by the mast acting through the second suspension 42, and as the rearward portion of the deck is flexed as the counterweight continues to be pulled upwardly.
  • the horizontal force components due to the weight of the counterweight in the unloaded condition are carried by the counterweight load bearing entity 70.
  • the bearing platform on the counterweight cooperating with the outermost rear end of the deck prevents further upward movement of the counterweight, the horizontal force components disappear.
  • the counterweight is connected under the outermost rear end portion of the machinery deck, and the whole weight of that portion of the machinery deck and the flexible strength of the rearward portion of the deck is added to the counterbalancing effect of the counterbalance.
  • the counterweight load bearing entity is a cylindrical collar mounted in concentric relation to the axis of rotation of the platform on a pedestal, as shown herein, or whether the counterweight load bearing entity is a horizontally disposed ring or track such as disclosed in U.S. Pat. No. 3,485,383.
  • a crane having a first support, a machinery deck rotatably mounted on a generally vertical axis with respect to said first support, an upstanding mast and an upstanding boom both pivotally mounted on a forward portion of the machinery deck for movement in a vertical plane passing through the axis of rotation of the machinery deck with respect to the support, a first suspension, means mounting said first suspension between an upper portion of said mast and an upper portion of said boom, a load line extending over the point of said boom, means for rotating said deck, means for powering the load line, and a load handling device supported by the load line hanging from the point of the boom; the improvement including:
  • A a counterweight
  • said counterweight being provided with a bearing platform in position to come into bearing relationship to said rearward portion of said deck when said counterweight is lifted by said second suspension means from load transmitting relationship with said counterweight load bearing entity.
  • the support is an upstanding pedestal
  • the counterweight load bearing entity includes a cylindrical counterweight support collar fixedly mounted with respect to the pedestal to be concentric with the axis of rotation of the machinery deck with respect to the pedestal, and wherein the counterweight support wheels are rotatably mounted on axes parallel to the axis of said deck rotation.
  • bearing platform is constituted as an integral portion of said counterweight and is situated in vertically underlying relationship with respect to an outermost rearward end portion of the machinery deck.
  • said means for pivotal support of said counterweight at a rearward portion of said deck includes upper and lower struts each pinned, respectively. to upper and lower portions of the counterweight and each extending to and encompassing the axis of said point of pivotal support of said counterweight with respect said rearward portion of said deck.
  • said counterweight support wheels include at least two sets of pairs of wheels, each set being rotatably mounted about spaced apart vertical axes at opposite ends of wheel beams, intermediate portions of such wheel beams being pivotally mounted with respect to spaced apart lower portions of said counterweight.
  • a machinery deck rotatably mounted on a generally vertical axes with respect to said upstanding pedestal, an upstanding mast and an upstanding boom both pivotally mounted on a forward portion of the machinery deck for movement in a vertical plane passing through the axis of rotation of the machinery deck with respect to the pedestal, a first suspension between an upper portion of said mast and an upper portion of said boom, a load line extending over the point of said boom, means for rotating said deck, means for powering the load line, and a load handling device supported by the load line hanging from the point of the boom; the improvement including:
  • A a counterweight
  • At least one counterweight support wheel mounted with respect to a lower portion of the counterweight to rotate on an axis lying in a vertical plane;
  • a cylindrical counterweight support collar fixedly mounted with respect to the pedestal to be concentric with the axis of rotation of the machinery deck and providing a counterweight load bearing surface in position to receive said counterweight support wheel;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Jib Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US466628A 1974-05-03 1974-05-03 Crane with a suspended rotatable counterbalance Expired - Lifetime US3921815A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US466628A US3921815A (en) 1974-05-03 1974-05-03 Crane with a suspended rotatable counterbalance
GB1546875A GB1470019A (en) 1974-05-03 1975-04-15 Offshore counterbalancing crane
SE7504499A SE404173B (sv) 1974-05-03 1975-04-18 Motbalanserad kran av pelartyp
CA225,280A CA1010412A (en) 1974-05-03 1975-04-23 Offshore counterbalancing crane
DE19752518613 DE2518613A1 (de) 1974-05-03 1975-04-24 Offshore-kran mit gewichtsausgleich
FR7513612A FR2269486B1 (enExample) 1974-05-03 1975-04-30
NO751582A NO140762C (no) 1974-05-03 1975-05-02 Motvektsanordning for en loeftekran

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US466628A US3921815A (en) 1974-05-03 1974-05-03 Crane with a suspended rotatable counterbalance

Publications (1)

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US3921815A true US3921815A (en) 1975-11-25

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US466628A Expired - Lifetime US3921815A (en) 1974-05-03 1974-05-03 Crane with a suspended rotatable counterbalance

Country Status (7)

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US (1) US3921815A (enExample)
CA (1) CA1010412A (enExample)
DE (1) DE2518613A1 (enExample)
FR (1) FR2269486B1 (enExample)
GB (1) GB1470019A (enExample)
NO (1) NO140762C (enExample)
SE (1) SE404173B (enExample)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170309A (en) * 1978-02-14 1979-10-09 Riggers Manufacturing Company Counterbalanced tower crane
US4243148A (en) * 1979-05-18 1981-01-06 Riggers Manufacturing Company Counterbalanced tower crane
WO1984001754A1 (en) * 1982-11-08 1984-05-10 Towmotor Corp Counterweight and axle mounting arrangement
US4557390A (en) * 1983-09-01 1985-12-10 Fmc Corporation Suspended counterweight control system
US4729486A (en) * 1986-04-07 1988-03-08 The Manitowoc Company, Inc. Lift enhancing beam attachment with movable counterweights
US4732762A (en) * 1983-03-07 1988-03-22 Metropolitan Mosquito Control District Timed release pest control composition and means
US4953722A (en) * 1988-11-09 1990-09-04 The Manitowoc Company, Inc. Crane and lift enhancing beam attachment with moveable counterweight
WO1997031855A1 (en) * 1996-02-29 1997-09-04 Mammoet Decalift International B.V. Hoisting device
US20080099421A1 (en) * 2006-10-27 2008-05-01 Pech David J Mobile Lift Crane with Variable Position Counterweight
US20080203045A1 (en) * 2006-10-27 2008-08-28 Pech David J Mobile Lift Crane With Variable Position Counterweight
WO2010121134A1 (en) * 2009-04-17 2010-10-21 Bigge Crane & Rigging Co. Ring derrick with stationary counterweight
US20110031202A1 (en) * 2009-08-06 2011-02-10 Pech David J Lift crane with moveable counterweight
CN102502423A (zh) * 2011-10-14 2012-06-20 三一集团有限公司 一种海上风电安装船用起重机
US20140069883A1 (en) * 2012-09-12 2014-03-13 A2Sea A/S System for rearranging the counterweight of a crane operation
CN103935909A (zh) * 2014-04-15 2014-07-23 中石化宁波工程有限公司 一种吊车旋转定位吊装方法
CN108751015A (zh) * 2018-05-31 2018-11-06 武汉船用机械有限责任公司 一种回转升降装置
US10179722B2 (en) 2014-01-27 2019-01-15 Manitowoc Crane Companies, Llc Lift crane with improved movable counterweight
US10183848B2 (en) 2014-01-27 2019-01-22 Manitowoc Crane Companies, Llc Height adjustment mechanism for an auxiliary member on a crane
CN116022663A (zh) * 2022-12-20 2023-04-28 中天科技集团海洋工程有限公司 一种重心可调的移动式起重机及调节重心的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541065A1 (de) * 1975-09-15 1977-03-17 Hans Tax Schwerlastdrehkran
FR2426008A1 (fr) * 1978-05-17 1979-12-14 Meca Etudes Acme Atel Const Grue repliable a potence de chargement de lest
US4216870A (en) * 1978-05-24 1980-08-12 Bucyrus-Erie Company Crane mounting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US446043A (en) * 1891-02-10 Counterbalanced jib-crane
US2374074A (en) * 1943-04-22 1945-04-17 Clyde Iron Works Inc Rotatable derrick
US3278045A (en) * 1964-03-09 1966-10-11 American Hoist & Derrick Co Counterweight support mechanism
US3485383A (en) * 1968-02-09 1969-12-23 Manitowoc Co Auxiliary support for cranes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US446043A (en) * 1891-02-10 Counterbalanced jib-crane
US2374074A (en) * 1943-04-22 1945-04-17 Clyde Iron Works Inc Rotatable derrick
US3278045A (en) * 1964-03-09 1966-10-11 American Hoist & Derrick Co Counterweight support mechanism
US3485383A (en) * 1968-02-09 1969-12-23 Manitowoc Co Auxiliary support for cranes
US3485383B1 (enExample) * 1968-02-09 1988-05-03

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170309A (en) * 1978-02-14 1979-10-09 Riggers Manufacturing Company Counterbalanced tower crane
US4243148A (en) * 1979-05-18 1981-01-06 Riggers Manufacturing Company Counterbalanced tower crane
WO1984001754A1 (en) * 1982-11-08 1984-05-10 Towmotor Corp Counterweight and axle mounting arrangement
GB2142601A (en) * 1982-11-08 1985-01-23 Towmotor Corp Counterweight and axle mounting arrangement
US4732762A (en) * 1983-03-07 1988-03-22 Metropolitan Mosquito Control District Timed release pest control composition and means
US4557390A (en) * 1983-09-01 1985-12-10 Fmc Corporation Suspended counterweight control system
US4729486A (en) * 1986-04-07 1988-03-08 The Manitowoc Company, Inc. Lift enhancing beam attachment with movable counterweights
US4953722A (en) * 1988-11-09 1990-09-04 The Manitowoc Company, Inc. Crane and lift enhancing beam attachment with moveable counterweight
WO1997031855A1 (en) * 1996-02-29 1997-09-04 Mammoet Decalift International B.V. Hoisting device
US6279764B1 (en) 1996-02-29 2001-08-28 Mammoet Decalift International B.V. Hoisting device
CN1076710C (zh) * 1996-02-29 2001-12-26 玛莫伊特迪卡里弗特国际有限公司 起重设备
US8511489B2 (en) 2006-10-27 2013-08-20 Manitowoc Cranes, Llc Mobile lift crane with variable position counterweight
US10336589B2 (en) 2006-10-27 2019-07-02 Manitowoc Crane Companies, Llc Mobile lift crane with variable position counterweight
US7546928B2 (en) 2006-10-27 2009-06-16 Manitowoc Crane Companies, Inc. Mobile lift crane with variable position counterweight
US12187587B2 (en) 2006-10-27 2025-01-07 Grove U.S. L.L.C. Mobile lift crane with variable position counterweight
US11884522B2 (en) 2006-10-27 2024-01-30 Grove U.S. L.L.C. Mobile lift crane with variable position counterweight
US7967158B2 (en) 2006-10-27 2011-06-28 Manitowoc Crane Companies, Llc Mobile lift crane with variable position counterweight
US20080203045A1 (en) * 2006-10-27 2008-08-28 Pech David J Mobile Lift Crane With Variable Position Counterweight
US20080099421A1 (en) * 2006-10-27 2008-05-01 Pech David J Mobile Lift Crane with Variable Position Counterweight
US8985353B2 (en) 2006-10-27 2015-03-24 Manitowoc Crane Companies, Llc Mobile lift crane with variable position counterweight
US8827092B2 (en) 2006-10-27 2014-09-09 Manitowoc Crane Companies, Llc Mobile lift crane with variable position counterweight
WO2010121134A1 (en) * 2009-04-17 2010-10-21 Bigge Crane & Rigging Co. Ring derrick with stationary counterweight
US9278834B2 (en) 2009-08-06 2016-03-08 Manitowoc Crane Group, LLC Lift crane with moveable counterweight
US20110031202A1 (en) * 2009-08-06 2011-02-10 Pech David J Lift crane with moveable counterweight
US11261064B2 (en) 2009-08-06 2022-03-01 Manitowoc Cranes, Llc Lift crane with moveable counterweight
US10457530B2 (en) 2009-08-06 2019-10-29 Manitowoc Cranes, Llc Lift crane with moveable counterweight
CN102502423A (zh) * 2011-10-14 2012-06-20 三一集团有限公司 一种海上风电安装船用起重机
US20140069883A1 (en) * 2012-09-12 2014-03-13 A2Sea A/S System for rearranging the counterweight of a crane operation
CN104703907A (zh) * 2012-09-12 2015-06-10 特雷克斯起重机德国有限公司 用于减少起重机的配重的系统
US9556007B2 (en) * 2012-09-12 2017-01-31 Terex Cranes Germany Gmbh System for rearranging the counterweight of a crane operation
US11208303B2 (en) 2014-01-27 2021-12-28 Manitowoc Crane Companies, Llc Lift crane with improved movable counterweight
US10183848B2 (en) 2014-01-27 2019-01-22 Manitowoc Crane Companies, Llc Height adjustment mechanism for an auxiliary member on a crane
US10179722B2 (en) 2014-01-27 2019-01-15 Manitowoc Crane Companies, Llc Lift crane with improved movable counterweight
US12528676B2 (en) 2014-01-27 2026-01-20 Manitowoc Crane Companies, Llc Lift crane with improved movable counterweight
CN103935909A (zh) * 2014-04-15 2014-07-23 中石化宁波工程有限公司 一种吊车旋转定位吊装方法
CN103935909B (zh) * 2014-04-15 2016-06-29 中石化宁波工程有限公司 一种吊车旋转定位吊装方法
CN108751015B (zh) * 2018-05-31 2020-07-21 武汉船用机械有限责任公司 一种回转升降装置
CN108751015A (zh) * 2018-05-31 2018-11-06 武汉船用机械有限责任公司 一种回转升降装置
CN116022663A (zh) * 2022-12-20 2023-04-28 中天科技集团海洋工程有限公司 一种重心可调的移动式起重机及调节重心的方法

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DE2518613A1 (de) 1975-11-13
CA1010412A (en) 1977-05-17
FR2269486B1 (enExample) 1977-07-08
SE7504499L (sv) 1975-11-04
SE404173B (sv) 1978-09-25
NO751582L (enExample) 1975-11-04
GB1470019A (en) 1977-04-14
NO140762B (no) 1979-07-30
NO140762C (no) 1979-11-07
FR2269486A1 (enExample) 1975-11-28

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