US3620579A - Extensible boom assembly - Google Patents

Extensible boom assembly Download PDF

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Publication number
US3620579A
US3620579A US833079A US3620579DA US3620579A US 3620579 A US3620579 A US 3620579A US 833079 A US833079 A US 833079A US 3620579D A US3620579D A US 3620579DA US 3620579 A US3620579 A US 3620579A
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US
United States
Prior art keywords
corner
boom
boom assembly
members
block
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
US833079A
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English (en)
Inventor
Archer W Brown
James L Montgomery
Lorraine V Erkenbrack
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
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Filing date
Publication date
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Publication of US3620579A publication Critical patent/US3620579A/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
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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
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks

Definitions

  • Telescopic crane booms have been used on motor vehicles to provide heavy-duty mobile units. Most of the telescopic boom structures have a plurality of sections which move rela tive to each other to change the length of the boom. Hydraulic cylinders and cable and pulley mechanisms are used to move the boom sections relative to each other. Telescopic crane booms of this type are shown in U.S. Pat. Nos. 3,315,821 and 3,398,645. The box-type boom sections of these booms are not designed to utilize the maximum strength of the boom material. The loads on the boom sections are not evenly distributed to the corner portions of the sections. The corner portions of the boom sections are not reinforced and do not cooperate with bearing pads to accommodate the bending and twisting loads on the boom sections.
  • the invention relates to a boom assembly having extensible boom sections that have maximum strength with a minimum weight.
  • the boom sections have reinforcing corner members joined together with substantially flat plate members to form box-shaped boom sections.
  • a plurality of boom sections are telescopically related relative to each other with a minimum clearance whereby they can contract and expand to change the length of the boom assembly.
  • a contractable and extensible means located within the boom section is operable to move the boom sections relative to each other.
  • the boom sections are slidably disposed relative to each other and are carried on longitudinally rockable wear and bearing pads which slidably engage adjacent corner members so as to provide direct and equalized load distribution on the boom sections.
  • An object of the invention is to provide high strength boom assembly sections that can be fabricated with accurate dimensional control of the depth and width of the sections so that they can telescope within each other with minimum clearances.
  • a further object of the invention is to provide a boom section with the greatest amount of material at the corner portions where it offers the greatest resistance to combination downward and sideward bending forces and torsion.
  • Another object of the invention is to rockably support comer portions of a boom section to distribute the load on the section.
  • FIG. 1 is a side view of a truck-mounted boom hoist equipped with the boom assembly of the invention
  • FIG. 2 is a rear end elevational view of FIG. 1;
  • FIG. 3 is a side view of the truck-mounted boom hoist showing the foreshortened boom assembly fully extended;
  • FIG. 4 is an enlarged foreshortened sectional view taken along line 4-4 ofFIG. 2;
  • FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4;
  • FIG. 6 is a sectional view taken along line 6-6 of FIG. 5;
  • FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. 6;
  • FIG. 8 is a sectional view taken along line 8-8 ofFIG. 4;
  • FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 8;
  • FIG. 10 is a sectional view taken along line 10-10 of FIG. 9.
  • FIG. 11 is a longitudinal sectional view of a modified wear block.
  • FIGS. 1, 2, and 3 there is shown in FIGS. 1, 2, and 3, a truck 15 carrying an extensible boom hoist, indicated generally at 16.
  • Truck 15 has an elongated longitudinal frame 17 connected to front and rear tandem dual wheels 18 and 19.
  • a transport cab 21 is mounted on the front of the frame 17.
  • the rear portion of the frame 17 carries a hoist support platform 22 mounting the hoist 16 for rotation about an upright axis.
  • a power unit (not shown) operates to swing the entire hoist 16 relative to the platform 22 and truck 15.
  • the truck 15 is laterally stabilized with two pair of outwardly directed arms 23 and 24 slidably attached to the midsection and rear of the frame 17.
  • Downwardly directed jacks 26 and 27 are operatively connected to the outer ends of the arms 23 and 24 respectively.
  • Each jack has a lower foot portion which engages the supporting surface to laterally stabilize the truck 15 and equalize and reduce the load on the tandem wheels 19.
  • the extensible boom hoist 16 has a supporting base 28 rotatably mounted on the platform 22 for movement about a generally upright axis. As shown in FIG. 2, laterally spaced upright side members or plates 29 and 31 are longitudinally secured to the top of base 28. Located adjacent the forward side of member 29 is a hoist cab 32 enclosing the controls for the hoist. Mounted on base 28 between the side members 29 and 31, laterally of the hoist cab 32, are a pair of winches 33 and 34 for receiving the cables or lines of the hoist.
  • a boom assembly is pivotally mounted with a transverse pivot member 37 to the upper rear portions of the side members 29 and 31.
  • a hydraulic cylinder 38 operable to raise and lower the boom assembly 36, is connected to the midportion of the side members 29 and 31 with pivot structure 39.
  • the piston rod of the cylinder 38 is connected with a pivot 41 to the boom assembly 36 forwardly of pivot 37.
  • the boom assembly 36 comprises a plurality of relatively movable boom sections, indicated generally at 42, 43, 44, and 45, which telescope relative to each other to change the length of the boom assembly.
  • FIG. 1 shows the boom assembly 36 in a contracted transport position.
  • FIG. 3 shows the boom assembly 36 in a fully extended and elevated position.
  • the length of boom assembly 36 can vary between fully extended and fully contracted and the elevation angle can be changed up and down.
  • a head 46 connected to the outer end of boom section 45 carries a pulley assembly 47 for directing a line 48 to a load hook and pulley unit 49.
  • a second pulled 51 directs a line 52 to a ball and hook member 53.
  • the lines 48 and 52 extend over pulley assembly 54 along the top of the boom assembly 36 and are directed by pulleys 55 and 56 to the winches 33 and 34.
  • the first or base boom section 42 has a generally rectangular cross section and encloses the telescoped boom sections 43, 44, and 45.
  • the boom section 42 has longitudinal right-angle corner members 57 at each corner extended the entire length of the boom section.
  • Upright and parallel side plates 58 and 59 are attached to adjacent side angle members.
  • top plate 61 and bottom plate 62 are attached to the top and bottom angle members to form the elongated rectangular boom section.
  • the right-angle corner members 57 are formed from rolled high strength steel as the bending and twisting forces on the boom section are maximum along the corners thereof.
  • the side plates 58 and 59, top plate 61, and bottom plate 62 are smaller in thickness than the corner members.
  • the rightangle comer members 57 are characterized as being strong and fabricated from high strength metal capable of withstanding large bending and twisting forces.
  • the plates can be of the same metal as the corner members.
  • right-angle member 57 has inwardly directed steps 63 along the outer ends of the flanges of the angle member.
  • the steps 63 have outwardly directed bevel edges 64. Both steps 63 and bevel edges can be rolled into the angle member during fabrication thereof.
  • the edges of the plates are located in the steps.
  • the beveled edges 64 provide linear spaces for welds 66 securing the plates to the angle members.
  • the cross-sectional dimensions of the boom section is held to close tolerances as the steps 63 and welds 66 allow for variations in the width of the plates.
  • the lapping of the plates and comer members at the steps 63 adjacent the bevel edges 64 provide a continuous groove for the weld 66 whereby minimum welding is needed to secure the plates to the comer members.
  • each boom section 42, 43, and 44 are reinforced with U-shaped collars 67, 67B, and 67C.
  • the collar 67 shown in FIG. 6, comprises an inwardly directed channel member secured to the side plates 58 and 59, bottom plate 62 and the corner angle members 57.
  • bottom wear pads or bearing blocks 68 slidably support the second boom section 43 in the base boom section 42.
  • Bottom wear pads 68 are lower flanges of the right-angle corner members of the boom sections.
  • the wear pads 68 are held in assembled relationwith the corner angle members 57 with generally flat U-shaped retainers 73 welded to the top of the horizontal flanges of the corner members 57.
  • the wear pads 68 are located between the retainer and the upright flanges of the corner members.
  • the wear pad 68 has a made from plastic material, as laminated phenolic, rethane or metal, as ductile iron.
  • the wear pads 68 with their top sliding faces 74 in conjunction with the convex supporting surface 76 provide limited rocking action for the supporting boom section. This action equalizes the bearing pressure under all conditions of boom assembly loading and deflection.
  • the inner top ends of the boom sections 43, 44, and 45 carry pairs of top wear pads 77, 78, and 79 located in sliding engagement with the right-angle corner members of the adjacent boom sections.
  • the wear pads 77, 78, and 79 are identical in structure to the bottom wear pads 68.
  • Cylinder unit 94 comprises a cylinder 96 having a rod end collar 97 secured to an inner end frame 98 of cylinder 96 in general longitudinal alignment with the boom sections.
  • a third hydraulic cylinder unit 103 comprising a cylinder 104 having a rod end collar 106 secured to the inner end frame 107 of the outer boom end of the cylinder unit is returned through an outlet line 113 to a reservoir.
  • a second cylinder inlet line 114 couples the head end of cylinder unit with the head end of cylinder 94.
  • a return line 116 connects the rod ends of cylinders 85 and 94.
  • a third cylinder inlet line 117 connects the head ends of cylinders 94 and 103.
  • a third cylinder outlet line 118 connects the rod ends of cylinders 94 and 103.
  • the third boom section will be released from the second boom sec-
  • the boom sections 42 to 45 telescope relative to each other in response to the operation of the extensible and contractable means 84.
  • the boom sections slide on the pairs of wear pads which ride on the corner members of the boom sections.
  • the lower wear pads 68, 69, and 71 function as support and fulcrum members which transmit force through the comer members.
  • These wear pads have longitudinally convex bottom surfaces which permit the wear pads to adjust for the deflection and twist of the boom sections under load. Since the wear pads are directly on the corner sections, loads are transmitted to the comer sections of the interrelated boom sections.
  • the top pairs of wear pads 77, 78, and 79 function as sliding stop members. These wear pads also act on the corner members of the boom sections and have longitudinal convex bottom surfaces so that the wear pads can adjust for the deflection and twisting of the boom sections and transmit the loads to the corner sections. The lateral bending and twisting forces are transmitted to the side-by-side corner members.
  • This combination of corner member and connecting plate structure produces a boom section that has a maximum strength per unit weight of material and permits the maximum amount of deflection and twisting without interference with the operation of the boom assembly.
  • Block 120 has a base 121 with a longitudinal convex outer surface 122.
  • Base 121 is made of metal, as steel, or similar hard material.
  • the side opposite the surface 122 has a rectangular recess 123 carrying a flat pad 124 of plastic material or similar antifriction material.
  • the pad 124 is bonded to the base 121 to keep the pad in assembled relation with the base.
  • the top surface 126 of the pad 124 is a flat sliding surface.
  • the invention includes changes in size and materials of the construction members.
  • the boom sections may have other cross-sectional shapes, as hexagonal, octagonal and the like.
  • the bearing pads may have sphericalshaped supporting bottom faces. Other changes may be made without departing from the invention.
  • a boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated right-angle member at each corner thereof, each angle member being a rolled member having generally normally disposed flanges, each flange having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, elongated plates extended between adjacent angle members forming the sides, top, and bottom of the boom section, said plates having linear side portions located in the pockets in the flanges, attaching means securing the side portions of the plates to the flanges. and wear pad means located between and only in engagement with the corner members of the adjacent boom sections.
  • the attaching means comprise linear welds to secure the corner members to the plates.
  • each comer flange has an outwardly directed bevel edge providing a groove for the weld.
  • each corner member has a thickness greater than the thickness of the plates.
  • the wear pad means comprise block members, each block member having a flat surface in sliding surface contact with one comer member and a convex face opposite the flat surface in engagement with the other corner member.
  • the boom assembly of claim 6 including: retaining means secured to said other corner member to confine the block member for limited rocking movement on the other corner member.
  • the wear pad means comprise a first pair of wear pads located between and in engagement with the lower corner members and a second pair of wear pads located between and in engagement with the upper comer members.
  • each wear pad has a flat surface in sliding surface contact with a movable comer member and a longitudinally convex face opposite the flat face surface in engagement with the other corner member.
  • the boom assembly of claim 9 including: retaining means secured to the comer member to confine the wear pad for limited rocking movement on the other corner member.
  • a boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated linear corner member at each corner thereof, each member having generally normally disposed portions, each portion having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, and elongated plate means having edges extended generally parallel to and adjacent the corner members, said edges located in the pockets in the portion, attaching means for securing said edges to the adjacent portions of the corner members, and wear pad means located between and only in engagement with the corner members of adjacent boom sections.
  • said attaching means to secure the plate means to the corner members comprise linear welds located in the steps to secure the corner members to the plate means.
  • the boom assembly of claim 11 including: collar means surrounding at least a portion of each boom section and secured to the corner members and the plate means of the boom section.
  • each corner member has a thickness greater than the thickness of the plate means.
  • said wear pad means comprises block means having a flat surface in sliding surface contact with one corner member and a convex face opposite the flat face in rocking engagement with the corner member adjacent the one corner member.
  • the block means has a convex face curved in the direction of movement ofone ofthe corner members.
  • said block means comprises a hard base member having a convex surface and pad means having a flat sliding outer surface, said pad means being secured to the base member o posite the convex surface.
  • the boom assembly of claim 15 including: retaining means secured to one corner member for holding the block means on the one corner member.
  • the retaining means comprise a generally U-shaped member located adjacent three sides of the block means.
  • said wear pad means comprises block means having a flat surface adapted to be located in sliding contact with one corner member and a convex face curved in the direction of movement of one of the comer members opposite the flat surface in engagement with the comer member adjacent the one corner member.
  • said block means comprises a hard base member having a convex surface 7 8 and pad means having a flat sliding outer surface, said pad means on said one corner member.
  • means being secured to the base member opposite the convex h boom as e bly of l im 24 wh rein: the retaining surface.
  • means comprises a generally U-shaped member located ad- 24.
  • the boom assembly of claim 21 including: retaining jacem three Sides Ofthe block means secured to one comer member for holding the block 5

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US833079A 1969-06-13 1969-06-13 Extensible boom assembly Expired - Lifetime US3620579A (en)

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Application Number Priority Date Filing Date Title
US83307969A 1969-06-13 1969-06-13

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US3620579A true US3620579A (en) 1971-11-16

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US (1) US3620579A (de)
CA (1) CA923460A (de)
DE (1) DE2029095A1 (de)
FR (1) FR2046732B1 (de)
GB (1) GB1287356A (de)
SE (1) SE358868B (de)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719403A (en) * 1970-11-17 1973-03-06 Kidde & Co Walter Crane boom having wear pads
US3719404A (en) * 1970-11-17 1973-03-06 Kidde & Co Walter Crane boom having universally swiveled wear pads
US3748807A (en) * 1971-10-12 1973-07-31 Kidde & Co Walter Adjustable and replaceable lateral guides for telescopic crane boom
US3817397A (en) * 1971-11-04 1974-06-18 Gen Crane Industries Telescopic masts or towers
US3978957A (en) * 1973-11-13 1976-09-07 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Hollow guiding mast for a charging device of a core reactor
US3985234A (en) * 1973-12-20 1976-10-12 Creusot-Loire Telescopic boom for a crane
US4011699A (en) * 1975-08-27 1977-03-15 Fmc Corporation Telescopic boom quick retract hydraulic circuit
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4134236A (en) * 1976-11-26 1979-01-16 Clark Equipment Company Side shoe assembly for a crane boom
US4148531A (en) * 1977-08-15 1979-04-10 American Hoist & Derrick Company Self-aligning slide pads for telescopic boom
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
DE3125603A1 (de) * 1980-07-02 1982-05-13 JLG Industries Inc., 17233 McConnellsburg, Pa. Teleskopausleger
US4442922A (en) * 1981-03-16 1984-04-17 Towmotor Corporation Adjustable slider bearing assembly
US4808015A (en) * 1987-10-06 1989-02-28 Federal-Mogul Corporation Clutch release bearing assembly including a double-acting sliding bore sleeve
US4984695A (en) * 1989-09-14 1991-01-15 Kabushiki Kaisha Kobe Seiko Sho Wheel crane
US5199193A (en) * 1991-12-26 1993-04-06 International Remote Corporation Working machine
DE29613042U1 (de) * 1996-07-26 1996-09-12 Liebherr Werk Ehingen Gleitlager für ineinandergelagerte schalenförmige Körper
US6108985A (en) * 1997-09-18 2000-08-29 Grove, U.S.L.L.C. Slide mount for telescopic parts
US20030215319A1 (en) * 2002-04-12 2003-11-20 Nurse Andrew David Boom for a load handling machine
US20060042131A1 (en) * 2004-08-30 2006-03-02 Caterpillar Inc. Wear pad for an extendable linkage
US20070068889A1 (en) * 2005-09-26 2007-03-29 Hans-Dieter Willim Mobile crane
US7284947B1 (en) * 2006-10-26 2007-10-23 Superior Industries, L.L.C. Braced telescoping support strut and system
US20110079488A1 (en) * 2005-10-20 2011-04-07 Superior Industries, Llc Portable low profile drive-over truck dump conveyor system
US20120085723A1 (en) * 2010-10-08 2012-04-12 Liebherr-Werk Ehingen Gmbh Boom element, telescopic boom and construction vehicle
EP2548834A1 (de) 2011-07-21 2013-01-23 Manitowoc Crane Companies, LLC Aus Platten gefertigter, auf Maß geschweißter Ausleger für eine Baumaschine und Verfahren zur dessen Herstellung
WO2012175766A3 (es) * 2011-06-20 2013-07-18 Rec. International Alfydia Limited Método y dispositivo elevador par montaje y desmontaje de componentes en un aerogenerador
WO2012135002A3 (en) * 2011-03-30 2014-05-01 Genie Industries, Inc. Wearpad arrangement
US8827559B2 (en) * 2012-08-23 2014-09-09 The Heil Co. Telescopic arm for a refuse vehicle
US10144584B2 (en) 2013-10-01 2018-12-04 The Curotto-Can, Llc Intermediate container for a front loading refuse container
EP3485108B1 (de) 2016-07-12 2020-05-27 Schwing GmbH Grossmanipulator mit gewichtsoptimiertem knickmast
CN113442107A (zh) * 2020-03-24 2021-09-28 广东博智林机器人有限公司 移动支撑装置和移动式机器人
US11802028B2 (en) 2017-11-27 2023-10-31 Liebherr-Werk Ehingen Gmbh Telescopic boom for a crane and crane having a corresponding telescopic boom

Families Citing this family (3)

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DE2524265C2 (de) * 1975-05-31 1984-08-23 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Teleskoprohrführung
US4337601A (en) * 1980-04-24 1982-07-06 Harnischfeger Corporation High-strength light-weight boom section for telescopic crane boom
US4396126A (en) * 1980-11-24 1983-08-02 Harnischfeger Corporation Telescoping crane boom

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US2551484A (en) * 1948-03-24 1951-05-01 Nat Tube Co Metal cask or tank with belt weld
US3243236A (en) * 1963-07-25 1966-03-29 John M Graham Low-friction bearing pads
US3300060A (en) * 1965-02-03 1967-01-24 Pettibone Mulliken Corp Booms with sequential hydraulic extension
US3304136A (en) * 1961-12-23 1967-02-14 Daimler Benz Ag Elastic bearing structure
US3350143A (en) * 1965-03-17 1967-10-31 Rca Corp Slide bearing employing a fluorocarbon lubricant
US3445004A (en) * 1967-02-01 1969-05-20 Bucyrus Erie Co Telescopic cantilevered boom

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551484A (en) * 1948-03-24 1951-05-01 Nat Tube Co Metal cask or tank with belt weld
US3304136A (en) * 1961-12-23 1967-02-14 Daimler Benz Ag Elastic bearing structure
US3243236A (en) * 1963-07-25 1966-03-29 John M Graham Low-friction bearing pads
US3300060A (en) * 1965-02-03 1967-01-24 Pettibone Mulliken Corp Booms with sequential hydraulic extension
US3350143A (en) * 1965-03-17 1967-10-31 Rca Corp Slide bearing employing a fluorocarbon lubricant
US3445004A (en) * 1967-02-01 1969-05-20 Bucyrus Erie Co Telescopic cantilevered boom

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719404A (en) * 1970-11-17 1973-03-06 Kidde & Co Walter Crane boom having universally swiveled wear pads
US3719403A (en) * 1970-11-17 1973-03-06 Kidde & Co Walter Crane boom having wear pads
US3748807A (en) * 1971-10-12 1973-07-31 Kidde & Co Walter Adjustable and replaceable lateral guides for telescopic crane boom
US3817397A (en) * 1971-11-04 1974-06-18 Gen Crane Industries Telescopic masts or towers
US3978957A (en) * 1973-11-13 1976-09-07 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Hollow guiding mast for a charging device of a core reactor
US3985234A (en) * 1973-12-20 1976-10-12 Creusot-Loire Telescopic boom for a crane
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4011699A (en) * 1975-08-27 1977-03-15 Fmc Corporation Telescopic boom quick retract hydraulic circuit
US4134236A (en) * 1976-11-26 1979-01-16 Clark Equipment Company Side shoe assembly for a crane boom
US4148531A (en) * 1977-08-15 1979-04-10 American Hoist & Derrick Company Self-aligning slide pads for telescopic boom
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
DE3125603A1 (de) * 1980-07-02 1982-05-13 JLG Industries Inc., 17233 McConnellsburg, Pa. Teleskopausleger
US4406375A (en) * 1980-07-02 1983-09-27 Jlg Industries Inc. Telescopic boom construction
US4442922A (en) * 1981-03-16 1984-04-17 Towmotor Corporation Adjustable slider bearing assembly
US4808015A (en) * 1987-10-06 1989-02-28 Federal-Mogul Corporation Clutch release bearing assembly including a double-acting sliding bore sleeve
US4984695A (en) * 1989-09-14 1991-01-15 Kabushiki Kaisha Kobe Seiko Sho Wheel crane
US5199193A (en) * 1991-12-26 1993-04-06 International Remote Corporation Working machine
DE29613042U1 (de) * 1996-07-26 1996-09-12 Liebherr Werk Ehingen Gleitlager für ineinandergelagerte schalenförmige Körper
US6108985A (en) * 1997-09-18 2000-08-29 Grove, U.S.L.L.C. Slide mount for telescopic parts
US7111745B2 (en) * 2002-04-12 2006-09-26 J. C. Bamford Excavators Limited Boom for a load handling machine
US20030215319A1 (en) * 2002-04-12 2003-11-20 Nurse Andrew David Boom for a load handling machine
US20060042131A1 (en) * 2004-08-30 2006-03-02 Caterpillar Inc. Wear pad for an extendable linkage
US7293377B2 (en) * 2004-08-30 2007-11-13 Caterpillar Inc. Wear pad for an extendable linkage
US20070068889A1 (en) * 2005-09-26 2007-03-29 Hans-Dieter Willim Mobile crane
US7506774B2 (en) 2005-09-26 2009-03-24 Liebherr-Werk Ehingen Gmbh Mobile crane
EP1767486A3 (de) * 2005-09-26 2008-06-04 Liebherr-Werk Ehingen GmbH Fahrzeugkran
US8011490B2 (en) 2005-10-20 2011-09-06 Superior Industries, Llc Portable low profile drive-over truck dump conveyor system
US20110079488A1 (en) * 2005-10-20 2011-04-07 Superior Industries, Llc Portable low profile drive-over truck dump conveyor system
US7284947B1 (en) * 2006-10-26 2007-10-23 Superior Industries, L.L.C. Braced telescoping support strut and system
US7618231B2 (en) * 2006-10-26 2009-11-17 Superior Industries, L.L.C. Braced telescoping support strut and system
US7470101B2 (en) * 2006-10-26 2008-12-30 Superior Industries, L.L.C. Braced telescoping support strut and system
US20080101910A1 (en) * 2006-10-26 2008-05-01 Superior Industries, Llc Braced telescoping support strut and system
US20090078545A1 (en) * 2006-10-26 2009-03-26 Felton Jarrod J Braced telescoping support strut and system
US20120085723A1 (en) * 2010-10-08 2012-04-12 Liebherr-Werk Ehingen Gmbh Boom element, telescopic boom and construction vehicle
WO2012135002A3 (en) * 2011-03-30 2014-05-01 Genie Industries, Inc. Wearpad arrangement
US8801354B2 (en) 2011-03-30 2014-08-12 Terex South Dakota, Inc. Wearpad arrangement
WO2012175766A3 (es) * 2011-06-20 2013-07-18 Rec. International Alfydia Limited Método y dispositivo elevador par montaje y desmontaje de componentes en un aerogenerador
US9290363B2 (en) * 2011-07-21 2016-03-22 Manitowoc Crane Companies, Llc Tailor welded panel beam for construction machine and method of manufacturing
EP2548834A1 (de) 2011-07-21 2013-01-23 Manitowoc Crane Companies, LLC Aus Platten gefertigter, auf Maß geschweißter Ausleger für eine Baumaschine und Verfahren zur dessen Herstellung
US20130020274A1 (en) * 2011-07-21 2013-01-24 Arumugam Munuswamy Tailor welded panel beam for construction machine and method of manufacturing
EP2865632A1 (de) 2011-07-21 2015-04-29 Manitowoc Crane Companies, LLC Aus Platten gefertigter, auf Maß geschweißter Ausleger für eine Baumaschine und Verfahren zur dessen Herstellung
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US9556898B2 (en) 2012-08-23 2017-01-31 The Heil Co. Telescopic arm for a refuse vehicle
US10274006B2 (en) 2012-08-23 2019-04-30 The Heil Company Telescopic arm for a refuse vehicle
US10865827B2 (en) 2012-08-23 2020-12-15 The Heil Co. Telescopic arm for a refuse vehicle
US11280368B2 (en) 2012-08-23 2022-03-22 The Heil Company Telescopic arm for a refuse vehicle
US11933352B2 (en) 2012-08-23 2024-03-19 The Heil Company Telescopic arm for a refuse vehicle
US10144584B2 (en) 2013-10-01 2018-12-04 The Curotto-Can, Llc Intermediate container for a front loading refuse container
EP3485108B1 (de) 2016-07-12 2020-05-27 Schwing GmbH Grossmanipulator mit gewichtsoptimiertem knickmast
US11802028B2 (en) 2017-11-27 2023-10-31 Liebherr-Werk Ehingen Gmbh Telescopic boom for a crane and crane having a corresponding telescopic boom
CN113442107A (zh) * 2020-03-24 2021-09-28 广东博智林机器人有限公司 移动支撑装置和移动式机器人

Also Published As

Publication number Publication date
CA923460A (en) 1973-03-27
DE2029095A1 (de) 1970-12-23
SE358868B (de) 1973-08-13
GB1287356A (en) 1972-08-31
FR2046732A1 (de) 1971-03-12
FR2046732B1 (de) 1976-03-19

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Owner name: AMERICAN CRANE CORPORATION, THE, A CORP. OF NC,NOR

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Effective date: 19870728

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN HOIST & DERRICK COMPANY, A CORP. OF DE;REEL/FRAME:004765/0581

Effective date: 19870728