US3756424A - Mobile crane outrigger assembly - Google Patents

Mobile crane outrigger assembly Download PDF

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Publication number
US3756424A
US3756424A US00212332A US3756424DA US3756424A US 3756424 A US3756424 A US 3756424A US 00212332 A US00212332 A US 00212332A US 3756424D A US3756424D A US 3756424DA US 3756424 A US3756424 A US 3756424A
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United States
Prior art keywords
outrigger
beams
pair
crane
equalizer
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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
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US00212332A
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English (en)
Inventor
R Rosenberg
A Malkiel
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CENTURY II Inc A CORP OF
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Harnischfeger Corp
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Assigned to CENTURY II, INC., A CORP. OF DE reassignment CENTURY II, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARNISCHFEGER CORPORATION, A CORP. OF DE
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Expired - Lifetime legal-status Critical Current

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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
    • B66C23/62—Constructional features or details
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/78—Supports, e.g. outriggers, for mobile cranes

Definitions

  • the outrigger assembly has two sections, one on each side of the chassis, and each section comprises two outrigger beams, a transfer beam component attached to the outrigger beams, a pair of equalizer beam components connected beneath and near the ends of the transfer beam component at predetermined vertical reaction points, and a pair of float components (outrigger pads) connected beneath and near the ends of each equalizer beam component.
  • a resilient bearing assembly with an integral mechanical connection for tension reactions provides an articulated connection between each component and comprises a resilient member that transmits vertical forces between components so that they are evenly distributed.
  • Some mobile cranes for handling cargoes on ship loading docks comprise an upper crane unit (including a boom) which is rotatably mounted on a lower crane unit, such as a crane carrier chassis.
  • Such cranes usually include an outrigger assembly, typically comprising four relatively small flat-bottomed floats or outrigger pads arranged in a rectangular pattern around the crane, that can be positioned so as to contact the dock surface and support and stabilize the crane during cargo handling operations. Due to space limitations on the docks such cranes are relatively narrow for maneuverability. Rotation of the upper crane unit causes shifting of the center of gravity of the crane, and high localized forces are transmitted to the dock by the floats as the crane is operated.
  • a mobile crane well adapted for use, for example, on structurally weak ship loading docks comprises a rotatable upper crane unit (including a boom) mounted on a mobile lower crane unit, such as a carrier chassis.
  • An outrigger assembly attached to the lower crane unit and movable from an extended raised, transport position to an extended, lowered position wherein it supports the crane, is comprised of two sections, one on each side of the carrier. Each section is comprised of a pair of telescoping, extendable outrigger beams which are attached at their outer ends to an extended rigid transfer beam component.
  • a pair of float assemblies each comprised of an elongated rigid equalizer beam component and a pair of float components are connected to and beneath the transfer beam component near the ends therof at predetermined vertical reaction points.
  • Each float component (outrigger pad) has a realtively large surface area and is connected to and beneath the equalizer beam component near the ends thereof.
  • Each connection is made by means of a bearing assembly which allows for limited articulation in all directions between the oonnected components.
  • Each bearing assembly includes a resilient member, such as an elastomeric block, for transferring forces downwardly from one component to the one below it.
  • Each bearing assembly further includes mechanical connecting means for lifting.
  • each of the four connection points between the two transfer beams and their four assoicated equalizer beams serves as a load support or vertical reaction point at which the vertical reaction force will be equal (assuming a given load and a constant boom angle) when the upper crane unit is rotated in the same relative position with respect to each of the vertical reaction points.
  • a mobile carrier chassis on which the lower portion of the crane is mounted is about 45 feet long and about 12 feet wide.
  • One set of outrigger beams is connected near the rear end of the chassis and the other near the middle of the chassis, i.e., about 23 feet apart.
  • the distance between the two transfer beams, each of which is about 32 feet long, when the outrigger beams are fully extended is about 28 feet.
  • the distance between the attachment points, i.e., the vertical reaction points for the two equalizer beams on each transfer beam is about 30 feet.
  • the distance between the attachment points for the two floats associated with each equalizer beam is about 15 feet.
  • Each float is about l5 feet long, and about 5 feet wide and has a surface area of about square feet.
  • the surface area of four floats on one side of the crane is approximately 300 square feet, and the total surface area of all floats in the outrigger assembly is about 600 square feet; or approximately six to 10 times the float surface area of comparable prior art outrigger assemblies.
  • the components of the outrigger assembly in accordance with the invention are relatively heavy in order to eliminate excessive deflection and, therefore, serve as an additional counterweight, thereby increasing the lifting capacity of the crane.
  • FIG. 1 is a side elevational view of a mobile crane incorporating an outrigger assembly in accordance with the invention shown on a dock or pier with a ship alongside;
  • FIG. 2 is a top plan view of the crane and outrigger assembly shown in FIG. 1;
  • FIG. 3 is an enlarged rear elevation view, with portions removed for clarity, of the outrigger assembly taken on line3-3 of FIG. 1;
  • FIG. 4 is an enlarged side elevation view of the outrigger assembly taken on line 4-4 of FIG. 2;
  • FIG. 5 is an enlarged cross-section view of one of a plurality of bearing assemblies of the outrigger assembly taken on line 5-5 of FIG. 4;
  • FIG. 6 is an enlarged plan view of a portion of a float with a portion broken away to show details.
  • a mobile truck crane 10 comprising a lower crane unit or carrier 12 on which an upper crane unit 14 is rotatably mounted and to which an outrigger assembly 16 is attached is shown on a typical dock 18 with a ship 20 alongside.
  • Upper crane unit 14 comprises an enclosure 22 for crane machinery, an operator's cab 24, a vertically pivotable boom 26, rigging 28 which supports the boom, and a load hoist line 30 reeved over a sheave 32 at the outer end of the boom for handling a load 34.
  • Upper crane unit 14 is rotatable through 360 in either direction about a point or center of rotation 36, shown in FIG. 2, and is shown rotated to a position 90 to the left of the longitudinal centerline of carrier 12.
  • Lower crane unit or carrier 12 which for example, is about 45 feet long and 12 feet wide, comprises a chassis 38, transport wheels 40, and a drivers cab 42.
  • Outrigger assembly 16 which comprises a right side section 44 and a left side section 46, is movable from an extended raised transport position to a lowered position in which it is shown in FIGS. 1 and 2 and wherein it supports crane l0.
  • Outrigger assembly 16 is comprised of outrigger beam means including four hydraulically operated telescopic outrigger beams designated as the left front and right front beams 48 and 50 and the left rear and right rear beams 52 and 54.
  • Front beams 48 and 50 which are slightly offset from each other, are located near the middle of carrier 12 and rear beams 52 and 54, which are slightly offset from each other, are located near the rear of the carrier.
  • the rear beams 52 and 54 are shown in detail in FIG.
  • Beam 52 comprises a relatively fixed hollow box 56 which is pinconnected on the underside of and athwart the chassis 38 of carrier 12. Beam 52 further comprises a relatively movable extendable beam section 60 which telescopes into box 56 and is also movable outwardly therefrom to partially or fully extended position. In fully extended position, the outer end of beam 52 is about 14 feet from the fore and aft centerline of carrier 12.
  • Extendable section 60 is movable to its retracted and extended positions by means of a hydraulic actuator 62 which is connected between outrigger box 56 and outrigger beam section 60. In extended position, beam section 60 is pivotable downward about a pivot pin 64 mounted inside box 56 by means of a hydraulic actuator 66 which is connected between box 56 and carrier 12.
  • a hydraulic actuator 62 which is connected between outrigger box 56 and outrigger beam section 60.
  • beam section 60 In extended position, beam section 60 is pivotable downward about a pivot pin 64 mounted inside box 56 by means of a hydraulic actuator 66 which is connected between box 56 and carrier 12.
  • outrigger beams 50 and 54 on the right side of carrier 12 are part of the right side section 44 of outrigger assembly 16 and outrigger beams 48 and 52 are part of the left side section 46. Since sections 44 and 46 are similar in construction and mode of operation, only right side section 44 is described in detail hereinafter.
  • the right side outrigger beams 50 and 54 are connected at their outermost ends to transfer beam means including an elongated rigid transfer beam 70 in the form of a box beam about 32 feet long.
  • transfer beam means including an elongated rigid transfer beam 70 in the form of a box beam about 32 feet long.
  • Right front beam 50 is connected at a location about 6 feet from the front end of transfer beam 70 and right rear beam 54 is connected at a location about 2 feet from the rear end of the transfer beam. These two locations are spaced about 23 feet apart.
  • the means for connecting right rear outrigger beam 54 to transfer beam 70 comprise a hollow cylindrical bearing sleeve 72 rigidly connected to and extending through the transfer beam.
  • a cylindrical shaft 74 which is rigidly connected to the outermost end of outrigger beam 54 is joumaled in sleeve bearing 72.
  • a thrust washer 76 is disposed on shaft 74 between the inner side of transfer beam 70 and the outer end surface of outrigger beam 54.
  • a keeper plate 78 is bolted to the outer end surface of shaft 74.
  • Each of the other outrigger beams 48, 50 and 52 is understood to be connected by similar means to its associated transfer beam. This arrangement permits a very limited amount of play or relative movement between the outrigger beams and their associated transfer beams. However, when the outrigger beams are secured in extended lowered position, each transfer beam is in effect rigidly connected to lower crane unit 12 and responds to movement thereof.
  • Transfer beam 70 is connected at locations or vertical reaction points about one foot from each end thereof to the midpoint of equalizer beam means in the form of a pair of elongated rigid equalizer beams 80 and 82; each having the form of a boxbeam about 17 feet long and located below the transfer beam.
  • Right front equalizer beam 80 is connected at locations about one foot from each end thereof to the midpoints of a pair of rigid floats or outrigger pads 84 and 86 disposed therebelow.
  • Equalizer beam 80 and its two floats 84 and 86 comprise a float assembly and all four float assemblies in outrigger assembly 16 are identical.
  • Right rear equalizer beam 82 is connected at locations about one foot from each end thereof to the midpoints of a pair of rigid floats 88 and 90 disposed therebelow.
  • right rear float 90 which is typical of the seven other floats in outrigger assembly 16 is on the order of 5 feet wide and 15 feet long and comprises, for example, a rectangular steel upper plate 92 having a plurality of spaced, parallel steel beam members 94 welded or otherwise secured to the underside thereof.
  • Heavy wooden crib members 96 are secured athwart the steel beam members 94 and lighter wooden crib members 98 are secured athwart the latter.
  • left side section 46 of outrigger assembly 16 comprises a transfer beam 100, two equalizer beams 102 and 104, and four floats 106, 108, and 112.
  • each bearing assembly 114 comprises elements which serve as a means for mechanically securing a float component to an equalizer beam component or an equalizer beam component to a transfer beam in an articulated manner so that the components are relatively movable with respect to each other in all directions at least to a limited degree.
  • bearing assembly 114 comprises a resilient member which serves as a means whereby one component can be resiliently supported by the component below it. Or, to put it another way, the bearing assembly serves as a means for transmitting forces vertically from one component to that below it.
  • bearing assembly 114 comprises a pair of spaced apart rigid steel plates 116 and 118 between which a resilient member 121, such as an elastomeric block, is disposed and, preferably, to which it is bonded.
  • the plates 116 and 118 are adapted by a plurality of bolts 120 therein to be rigidly attached to their associated components, i.e., to a transfer beam and an equalizer beam or to an equalizer beam and a float.
  • the plates 116 and 118 and resilient member 121 are provided with centrally located openings 122, 124 and 126, respectively, which accommodate a cylindrical steel rod bolt 128 extending therethrough.
  • the ends of rod bolt 128 are threaded and nuts 130 and 132 are disposed thereon. Undesired rotation of the nuts 130 and 132 is prevented by cotter pins 134 and 136, respectively, which extend through holes in rod bolts 128 and engage a groove 138 in each nut.
  • the plates 116 and 118 are provided with hollow cylindrical bearing retainers 140 and 142, respectively, which are concentric with the openings "122 and 126, respectively, and are secured to the plates by bolts 144, Bearings 146 and 148, which have concave bearing surfaces, are secured in the bearing retainers 140 and 142 respectively, and cooperate with bearings 150 and 152, respectively, on rod bolt 128, which have convex hearing surfaces. Washers 154 and 156 are disposed between the nuts 130 and 132 and the bearings 150 and 152, respectively.
  • the plates 116 and 118, the bearing retainers 140 and 142, the bearings 146, 148, 150 and 152, the nuts 130 and 132 cooperate and serve as the means for connecting components attached to the plates 116 and 118 in proper but articulated relationship and enable the components to be moved together.
  • the resilient member 121 serves as a resilient support and downward force transmittal means for components connected to the plates 116 and 118.
  • the four locations on the transfer beams 70 and 100 at which the bearings 114 for the equalizer beams are located serve as load support or vertical force reaction points at which downward vertical forces will be equal (assuming a given load and a constant boom angle) as upper crane unit 14 is rotated and crane boom 26 is aligned with each of the points. More specifically, when boom 26 is directly over one of the four vertical reaction points described, maximum downward force is exerted at the vertical reaction point directly below the boom. However, there is absolutely no downward force exerted at the diametrically opposite vertical reaction point. The two remaining vertical reaction points trans fer forces which are less than the force exerted at the vertical reaction point directly below the boom. This distribution of forces exists, even though the center of gravity shifts as upper crane unit 14 rotates.
  • a mobile crane comprising: a vehicle; an upper unit mounted on said vehicle and rotatable horizontally about a center of rotation, said upper unit comprising a boom pivotable about a generally horizontal axis; said vehicle and upper unit having a combined center of gravity which describes a non-circular path around said center of rotation as said upper unit rotates, assuming constant load and boom angle conditions; two pairs of horizontally spaced apart outrigger beams mounted transversely on said vehicle, each pair of outrigger beams being extendible and retractable in a generally transverse direction from the sides of said vehicle; a transfer beam rigidly connected to each pair of outrigger beams and at each of opposite sides of said vehicle and movable with the outrigger beams to a position beyond said non-circular path; a pair of equalizer beams connected to each transfer beam, each equalizer beam being connected at a vertical reaction point on said transfer beam, said reaction points being located fore and aft, respectively, from their adjacent Outrigger beams; and a pair of floats connected to
  • a mobile crane according to claim 1 including a bearing assembly connected to and between each equalizer beam and its associated transfer beam and to and between each float and its associate equalizer beam.
  • each bearing assembly comprises mechanical means for articulately connecting components, such as beams and floats associated with the bearing assembly.
  • each bearing assembly further comprises a resilient member for transmitting forces between said components.
  • each bearing assembly comprise a pair of vertically spaced apart attachment members for connection to associated beams and floats, wherein said resilient member comprises an elastomeric member disposed between said pair of attachment members, and wherein said articulated meattachment members comprises a hole for accommodating said rod and further comprises a concave bearing for association with a convex bearing on an end of said rod.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Leg Units, Guards, And Driving Tracks Of Cranes (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
US00212332A 1971-12-27 1971-12-27 Mobile crane outrigger assembly Expired - Lifetime US3756424A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21233271A 1971-12-27 1971-12-27

Publications (1)

Publication Number Publication Date
US3756424A true US3756424A (en) 1973-09-04

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Application Number Title Priority Date Filing Date
US00212332A Expired - Lifetime US3756424A (en) 1971-12-27 1971-12-27 Mobile crane outrigger assembly

Country Status (8)

Country Link
US (1) US3756424A (de)
JP (1) JPS4873924A (de)
AU (1) AU450139B2 (de)
CA (1) CA952892A (de)
DE (1) DE2262444C3 (de)
FR (1) FR2166071B3 (de)
GB (1) GB1361766A (de)
IT (1) IT974209B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040007552A1 (en) * 2002-07-09 2004-01-15 Hermann Franzen Mobile handling equipment for piece goods
US20060104774A1 (en) * 2002-12-18 2006-05-18 Sessler Laverne M Jr Mobile receptacle for a catching debris
US20100253044A1 (en) * 2008-02-06 2010-10-07 Putzmeister Concrete Pumps Gmbh Mobile work machine
NL2019784B1 (en) * 2017-10-23 2019-04-29 Spierings Group B V Outrigger assembly and vehicle, such as a mobile crane, comprising the outrigger assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109353945A (zh) * 2018-10-30 2019-02-19 广州黄船海洋工程有限公司 一种船用克令吊的吊装系统及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227287A (en) * 1964-01-15 1966-01-04 Universal Marion Corp Stabilizer unit for mobile crane apparatus and the like
DE1251928B (de) * 1967-10-12
US3545627A (en) * 1968-12-30 1970-12-08 Letourneau Inc Heavy duty crane for use in a narrow loading area

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2051300A5 (de) * 1969-06-27 1971-04-02 Bartoli Tullio

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251928B (de) * 1967-10-12
US3227287A (en) * 1964-01-15 1966-01-04 Universal Marion Corp Stabilizer unit for mobile crane apparatus and the like
US3545627A (en) * 1968-12-30 1970-12-08 Letourneau Inc Heavy duty crane for use in a narrow loading area

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040007552A1 (en) * 2002-07-09 2004-01-15 Hermann Franzen Mobile handling equipment for piece goods
US20060104774A1 (en) * 2002-12-18 2006-05-18 Sessler Laverne M Jr Mobile receptacle for a catching debris
US20100253044A1 (en) * 2008-02-06 2010-10-07 Putzmeister Concrete Pumps Gmbh Mobile work machine
US8366148B2 (en) * 2008-02-06 2013-02-05 Putzmeister Engineering Gmbh Mobile work machine
NL2019784B1 (en) * 2017-10-23 2019-04-29 Spierings Group B V Outrigger assembly and vehicle, such as a mobile crane, comprising the outrigger assembly
WO2019083357A1 (en) * 2017-10-23 2019-05-02 Spierings Group B.V. STABILIZER AND VEHICLE ASSEMBLY, SUCH AS A MOBILE CRANE, COMPRISING THE STABILIZER ASSEMBLY
CN111542486A (zh) * 2017-10-23 2020-08-14 斯皮林斯集团公司 支腿组件和包括支腿组件的诸如移动吊车的车辆
CN111542486B (zh) * 2017-10-23 2021-10-29 斯皮林斯集团公司 支腿组件和包括支腿组件的诸如移动吊车的车辆

Also Published As

Publication number Publication date
IT974209B (it) 1974-06-20
FR2166071B3 (de) 1975-11-07
GB1361766A (en) 1974-07-30
DE2262444B2 (de) 1980-07-10
AU450139B2 (en) 1974-06-27
AU5006872A (en) 1974-06-27
CA952892A (en) 1974-08-13
DE2262444C3 (de) 1981-05-14
JPS4873924A (de) 1973-10-05
FR2166071A1 (de) 1973-08-10
DE2262444A1 (de) 1973-07-05

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Date Code Title Description
AS Assignment

Owner name: CENTURY II, INC., A CORP. OF DE, WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HARNISCHFEGER CORPORATION, A CORP. OF DE;REEL/FRAME:004969/0781

Effective date: 19880429

Owner name: CENTURY II, INC., MAYFAIR ATRIUM BUILDING, 10400 W

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HARNISCHFEGER CORPORATION, A CORP. OF DE;REEL/FRAME:004969/0781

Effective date: 19880429