US3708937A - Trapezoidal telescoping crane boom - Google Patents

Trapezoidal telescoping crane boom Download PDF

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Publication number
US3708937A
US3708937A US00075886A US3708937DA US3708937A US 3708937 A US3708937 A US 3708937A US 00075886 A US00075886 A US 00075886A US 3708937D A US3708937D A US 3708937DA US 3708937 A US3708937 A US 3708937A
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United States
Prior art keywords
boom
section
side webs
sections
base section
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
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US00075886A
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English (en)
Inventor
R Sterner
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Kidde Inc
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Walter Kidde and Co Inc
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22128568&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US3708937(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Walter Kidde and Co Inc filed Critical Walter Kidde and Co Inc
Application granted granted Critical
Publication of US3708937A publication Critical patent/US3708937A/en
Assigned to KIDDE, INC., reassignment KIDDE, INC., CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). FILED 4-16-80 DELAWARE Assignors: WALTER KIDDE & COMPANY, INC.
Assigned to KIDDE, INC., A DE CORP. reassignment KIDDE, INC., A DE CORP. MERGER (SEE DOCUMENT FOR DETAILS). MEMORANDUM OF DISTRIBUTION IN LIQUIDATIOIN Assignors: HIMP-2 INC., A DE CORP. (CHANGED TO), KIDDE, INC., A DE CORP. (MERGED INTO)
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). MARCH 31, 1988 (DELAWARE) Assignors: BLOOM-1 INC.
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). APRIL 5, 1988 DELAWARE Assignors: HKID 45 INC.
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
    • B66C23/64—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

  • a crane boom comprises plural extensible and retractable telescoping sections each of which is trapezoidal in cross section.
  • the trapezoidal cross sectional shape imparts to a boom of given weight greater lifting capacity or longitudinal rigidity and greater lateral stability than any other cross sectional shape,
  • the trapezoidal cross section allows for a much more efficient BOOM [75] Inventor: Russell L. Sterner, Greencastle, Pa.
  • a rectangular cross-sectioned boom also has other design limitations;
  • a crane boom is primarily a cantilevered beam, a moment carrying member, and in a telescopic boom the telescoping sections must fit closelyinside each other with as little side, top and bottom play as possible.
  • the width is therefore limited to such an extent th at'there is not sufficient room to properly stiffen the vertical web members of the rectangular cross-section, so thatall stiffening is obtained in the thickness of the metal used.
  • Massive shear forces are therefore present at the points of concentrated loads when the boom is in extended position, that is, within the socket area or overlap area of adjacent extended telescopic sections.
  • the boom art therefore requires a break-through in the design of telescopic booms which will enable the strength and rigidity to weight ratio in both longitudinal and lateral directions to be substantially increased, thus enabling a boom of a given weight to be capable of lifting considerably heavier loads than a prior art boom of the same weight.
  • Triangular cross-sectioned telescopic booms have been used in machinery where the majority of the load is along the longitudinal axis of the boom, but such an arrangement, while it approaches a solution to the design problem of lateral rigidity, since the base of the cross-section is much wider than the apex of the triangular cross-section, it is not suitable for use in a cantilevered crane boom which functions as a load carrying beam.
  • a boom having a cross-section of an equilateral triangle with longitudinally extending chord members of equal cross-sectional area in each corner of the triangular configuration provides a good column design which efficiently functions as a compression member but it will not efficiently function as a cantilevered load lifting beam.
  • the main reason is that the chord at the apex of the triangular cross-section cannot provide sufficient track or bearing area for the wear pads of the adjacent inner section and tremendous concentrated forces would, therefore, be present atthe apex of the triangular section.
  • a triangular cross-section restricts the inner area available in a boom for the positioning of the operating hydraulic cylinders to such a great extent that this restriction alone makes a triangular cross-sectional boom impracticable.
  • a telescoping preferably hydraulically operated crane boom of the type commonly used on mobile carriers is provided.
  • the boom is characterized by the fact that the several boom sections are trapezoidal in cross section and preferably the wider base of the trapezoid is lowermost and its sides, which are of equal length, converge upwardly.
  • the trapezoid is symmetrical and has its major axis disposed in a vertical plane. Thisconstruction greatly increases the lifting efficiency of the crane boom and its economy in terms of lifting capacity to weight ratio.
  • the total boom and its sections are more rigid in the longitudinal direction or in the plane in which the lifted load is suspended.
  • the boom is also more stable laterally and more resistant to lateral deformation and twisting.
  • the trapezoidal configuration possesses other marked advantages over rectangular and other shapes. Additional room is provided for side and bottom web stiffeners and for front and rear lateral guides without increasing the space between telescoping sections which must be maintained to a minimum. Additionally, the wear pads or bearings between adjacent. sections of the boom may be located substantially in direct alignment with the reinforced side webs and this important feature has not been'possible with other cross sectional shapes, including rectangular.
  • the trapezoidal shape also provides adequate internal chamber space for hydraulic rams and associated components.
  • FIG. 1 is a front perspective view of a retracted trapezoidal telescoping crane boom embodying the inventionj
  • FIG. 2 is a side elevation of the-boom facing in the oppositedirection to that depicted in FIG. 1;
  • FIG. 3 is a plan view of the retracted boom
  • FIG. 4 is a bottom plan view thereof
  • FIG. 5 is an enlarged frontend elevational view of the boom
  • FIG. 6 is a similar rear end elevational view
  • FIG. 7 is an enlarged fragmentary cross section taken on line 7-7 of FIG. 3;
  • FIG. 8 is a similar section taken on line 8-8 of FIG.
  • FIG. 9 is a side elevational view of the boom extended, on a considerably reduced scale
  • FIG. 10 is an enlarged side elevational view of the portion A in FIG. 9; I
  • FIG. 11 is a similar view of the portion B in FIG. 9;
  • FIG. 12 is a similar view of the portion C in FIG. 9;
  • FIG. 13 is a similar view of the portion D in FIG. 9;
  • FIG. 14 is an enlarged transverse vertical section
  • the numerals 20, 2,1, 22 and 23 designate, respectively, the base section, inner mid section, outer mid-section, and the fly.
  • each of the individual boom: sections is trapezoidal in cross section and in each case the wide base of the trapezoidal .boom section is lowermost-and the upwardly converging sides are of equal length so that the trapezoid is symmetrical about its neutral axis.
  • the trapezoid forming the basis of the cross sectional shape of each of the boom sectionspis elongated in the vertical plane, FIG. 5, that is to say, the depth of the trapezoid in the vertical plane throughits center is greater than its maximum width at the base.
  • the characteristic trapezoidal shape differs in its details from the other boom sections.
  • the base section 20 which is the outermost of the boom sections and therefore has the largest trapezoidal cross section, embodies a top plate 24 extending for its entire length and relatively thin side walls or webs 25 which diverge downwardly from the longitudinal edge portions of the top plate in a symmetrical manner with respect to a theoretical central vertical plane through the boom.
  • the base section 20 further comprises a relatively thin bottom web 26 bounded along its longitudinal edges by continuous bars or rails 27 of increased thickness and rigidity. The elements 26 and 27 make up the lower base of thetrapezoidal base section 20.
  • each web stiffener 28 is a channel member having its open side facing the adjacent side web 25.
  • bottom web stiffeners 29 are provided at spaced intervals along the bottom web'26 to reinforce the same against buckling and, as shown at FIGS. 3 and 4, the stiffeners 28 and 29 may be'disposed at similar locations along the boom section 20. While the spacing of the web. stiffeners is not extremely critical, they are preferably spaced apart by distances which approximate the depth of the trapezoidal boom section to which they are applied.
  • FIG. 8 illustrates the channel construction of the bottom web stiffeners 29 whose open sides face the web 26.
  • the base section 20 is equipped at its rear end with a suitably reinforced main pivot .unit 30 for the entire boom which is attachable in a conventional manner to ,themobile carrier. Near its mid point and on its bottom, the boom base section is also equipped with a reinforced connector 31 for the boom lifting cylinder indicated in phantom lines at 32 in FIG. 2.. At its forward end, the base section 20 carries an underslung transverse boxfmember 33 which receives the lower forward wear plates or pads 34 and their conventional holders. v
  • the top plate24 is reinforced by an overlay plate 35. Additionally, in this region, side longitudinal reinforcing bars 36 it are employed preferably between the forward four web stiffeners 28 and directly under the top plate 24 togreatly reinforce the welded joints so as to resistthe greatest wear pad stress. Suitable diagonal braces 37 are also preferably employed on opposite sides of the base section, as shown in the drawings, to render the structure further rigid in the critical region of high stress.
  • a stabilizing means 38 for the inner mid section 21 when the boom is fully retracted, preventing the boom sections from shifting laterally or twisting relative to one another.
  • the inner and outer mid sections 21 and 22 of the telescoping crane boom are very similar in construction to the base section except that they are not equipped with the elements 30 and 31 and are of successively smaller trapezoidal cross sectional shape for close interfitting relationship with each other and with the base section 20. It is therefore believed that it is unnecessary to completely describe the boom mid sections 21 and 22, and in the drawings primed and double-primed reference numerals corresponding to' the numerals employed for various components of the base section 20 are used to designate the identical parts in the inner and outer mid sections 21 and 22. Except for differences in size, the construction and functioning of these various detailed elements on the boom sections 20, 21 and 22 are identical.
  • the inner and outer mid sections 21 and 22 contain one other feature of difference from the base section 20 in that both of the former are provided at their rear ends and tops with laterally spaced wear pads 39 mounted in holders 40, FIG. 6, having reinforcing and bracing means 41 and 42 at the rear end of the particular boom section.
  • the base section 20 requires no upper wear pads since it does not operate inside of another boom section.
  • the lower wear pads 34, 34' and 34" may be located directly under the side webs 25, 25' and 25" so as to receive directly the forces or loads transmitted through these webs.
  • This advantageous arrangement of wear pads or rollers in some cases, is not readily attainable when rectangular cross sectional boom sections are employed because the lower pads as well as the upper pads must be arranged somewhat inwardly of the side webs.
  • the mass above this axis including the top plate 24 is approximately equal to the mass below the neutral axis including web 26 and bars 27 and associated elements. As is apparent in FIG. 14, the major mass elements 24 and 26-27 are located as far as possible on opposite sides of the neutral axis.
  • fly section 23 of the boom has the same characteristic trapezoidal shape and embodies a similar top plate 44, side webs 45, and bottom web 46 reinforced at its edges by longitudinal bars 47, the various web stiffeners and bracing on the base section 20 and mid sections 21 and 22 is unnecessary and need not be employed. This is true because'the fly section 23 is customarily extended during use only when relatively light loads are being handled and not under heavy loads. Therefore, the fly section is never subjected to the high degrees of stress that the other boom sections receive. Since the fly section 23 has no boom section telescoped within it, it also requires no forward wear plates or pads similar to the pads 34, 34' and 34". However, the fly section 23 does require and is equipped with the upper rear bearing pads or rollers, in some instances, and these are conventional elements in the art. The fly section carries the conventional nose assembly 48 shown in phantom lines in FIGS. 2 and 13.
  • the telescopic crane boom may be extended and retracted by any desired hydraulic means or by mechanical cable means, or the like. Preferably, it is hydraulically operated and a preferred operating means of this character is illustrated somewhat schematically in phantom lines in the drawings. Referring particularly to FIGS. 10 through 13, the piston rod 49 of the first ram is secured as at 50 to the back of base section 20 and the cylinder 51 of this first ram is pivoted at 52 to the rear of inner mid section 21, the forward end of this ram cylinder extending freely into the inner mid section 21, FIG. 1 1.
  • a box element 53 is pivoted at 54 to the rear of outer mid section 22 and extends forwardly with a free and terminating adjacent the forward end of the outer mid section, FIG. 12.
  • the cylinder end 55 of another ram is pivoted at 56 to the rear end of inner mid section 21 and extends forwardly into and through the box 53 and the rod end 57 of this ram is pivotally connected at 58 to the forward terminal end of the box 53, as shown in FIG. 12.
  • each of the hydraulic rams is an individually actuated double acting ram.
  • the boom fly section 23 is preferably reinforced between its side webs 45 with a centrally located transverse brace web 45 which extends continuously for the full length of the fly section. Additionally, front lateral guides or pads 63, 63' and 63" are provided on opposite sides of the base section 20 and inner and outer mid sections 21 and 22 to stabilize and guide the interfitting boom sections laterally.
  • rear lateral guides or pads 64, 64 and 64" are provided on opposite sides ofthe two boom mid sections and the fly sections 23, FIG. 6.
  • a telescoping crane boom comprising a base section for the .boom having means to pivot it'about one end thereof, at least one additional extensible and retractable boom section telescopically engaged within the base section with means connected thereto adapted to load only the outer free end of the crane boom, power means to extend and retract the telescoping boom, all sections of the telescoping boom being trapezoidal in transverse cross section and including upwardly converging side webs, a relatively narrow top plate secured to the side webs and a relatively wide bottom plate unit secured to the side webs, a reinforcefacing and abutting the webs to which they are welded. '6.
  • a telescoping crane boom comprising a base section for the boom having means to pivot it about one ment for the top plate of at least the base section of the boom adjacent'the forward end of the base section to resist stresses produced thereon by extension and loading of the next forwardmost boom section having upper wear pads bearing againstthe top plate of the base section, and said reinforcement comprising an overlayplate mounted on said top plate, and a pair of side reinforcing bars adjacent the overlay plate and near the tops of the side webs and secured thereto and to said top plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00075886A 1970-09-28 1970-09-28 Trapezoidal telescoping crane boom Expired - Lifetime US3708937A (en)

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Application Number Priority Date Filing Date Title
US7588670A 1970-09-28 1970-09-28

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US3708937A true US3708937A (en) 1973-01-09

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US (1) US3708937A (fr)
BE (1) BE764815A (fr)
CA (1) CA934330A (fr)
DE (1) DE2114501B2 (fr)
ES (1) ES202409Y (fr)
FR (1) FR2108227B1 (fr)
GB (1) GB1292020A (fr)
NL (1) NL157576C (fr)
ZA (1) ZA711696B (fr)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804262A (en) * 1972-09-18 1974-04-16 Harnischfeger Corp Telescopic boom
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3890757A (en) * 1974-02-28 1975-06-24 Case Co J I Boom members having stiffener elements for crane boom constructions
US3985234A (en) * 1973-12-20 1976-10-12 Creusot-Loire Telescopic boom for a crane
US4003168A (en) * 1975-06-27 1977-01-18 Walter Kidde & Company, Inc. Crane boom of trapezoidal boom sections having reinforcing rings
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4112649A (en) * 1977-08-26 1978-09-12 Harnischfeger Corporation Boom section for telescopic crane boom
US4168008A (en) * 1978-02-23 1979-09-18 Granryd Tod G Telescopic crane boom having corrugated boom sections
US4171597A (en) * 1976-01-29 1979-10-23 Coles Cranes Limited Crane boom and telescopic section for it
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
US4417424A (en) * 1980-01-07 1983-11-29 Jacobson Darwin J Segmented extendible boom
US4478014A (en) * 1981-12-14 1984-10-23 Fmc Corporation Telescopic boom with angled corner construction
US4550787A (en) * 1983-07-05 1985-11-05 Alexander Stefan Earth boring machine and working crane
US5465854A (en) * 1993-07-30 1995-11-14 Par Systems, Inc. Telescoping tube assembly
US5762467A (en) * 1996-04-26 1998-06-09 Par Systems, Inc. Underground storage tank manipulator
US6349489B1 (en) * 1997-07-15 2002-02-26 Komatsu Ltd. Structure for working unit for bucket excavators and method for manufacturing the same
US20020045172A1 (en) * 2000-06-30 2002-04-18 Sturm Albert J. Segmented support structure and method and fixture for making the same
US6561368B1 (en) 2000-05-01 2003-05-13 Par Systems, Inc. Telescoping tube assembly with a cabling system
US20030171191A1 (en) * 2002-03-06 2003-09-11 Nautilus, Inc. Exercise bicycle handlebar
US20030215319A1 (en) * 2002-04-12 2003-11-20 Nurse Andrew David Boom for a load handling machine
US6726437B2 (en) 2002-02-08 2004-04-27 Clark Equipment Company Telescoping loader lift arm
US20040248701A1 (en) * 2001-01-19 2004-12-09 Nautilus, Inc. Exercise device tubing
US20060010689A1 (en) * 2004-07-14 2006-01-19 Ali Salour Automated drill process for two-diameter holes in multi-layer variable thickness composite materials
US20070098536A1 (en) * 2005-10-31 2007-05-03 Kooima Roger D Extendable telescoping boom and method of manufacturing
US7284947B1 (en) * 2006-10-26 2007-10-23 Superior Industries, L.L.C. Braced telescoping support strut and system
US20080035010A1 (en) * 2006-08-14 2008-02-14 Mckay Douglas Mcgregor Trapezoidal strong back beam system
US7624967B1 (en) 2006-04-19 2009-12-01 Par Systems, Inc. Opposed-rope hoist driven telescoping mast
US20100234185A1 (en) * 2009-03-13 2010-09-16 Nautilus, Inc. Exercise bike
USD624612S1 (en) 2009-10-21 2010-09-28 Nautilus, Inc. Exercise bike
US20110036799A1 (en) * 2007-11-22 2011-02-17 Mckay Douglas Mcgregor Lifting Assemblies Including Trapezoidal Strong Back Beam Systems
US20110079488A1 (en) * 2005-10-20 2011-04-07 Superior Industries, Llc Portable low profile drive-over truck dump conveyor system
US20120090261A1 (en) * 2010-10-19 2012-04-19 Ed Anderson Boom assembly
US20130020274A1 (en) * 2011-07-21 2013-01-24 Arumugam Munuswamy Tailor welded panel beam for construction machine and method of manufacturing
US8678210B1 (en) 2010-11-17 2014-03-25 Link-Belt Construction Equipment Co., L.P., Lllp Telescoping boom assembly with base section having primary shell and secondary formed shell
US9033165B2 (en) 2011-02-09 2015-05-19 Oshkosh Corporation Crane assembly
US10112807B2 (en) 2014-09-26 2018-10-30 Putzmeister Engineering Gmbh Supporting leg and supporting construction for a working machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1564509A (en) * 1976-01-29 1980-04-10 Coles Cranes Ltd Octagonal crane boom
DD215518A5 (de) * 1982-10-27 1984-11-14 Fuchs Fa Johannes Ausleger fuer hebezeuge, insbesondere hebebuehnen, bagger oder dergleichen
DE3713152C1 (en) * 1987-04-15 1988-04-21 Mannesmann Ag Box-type telescoping crane jib
DE102016112748A1 (de) 2016-07-12 2018-01-18 Schwing Gmbh Großmanipulator mit gewichtoptimiertem Knickmast

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DE1009373B (de) * 1953-05-11 1957-05-29 Walter Alfred Golka Teleskopausleger
FR1171016A (fr) * 1957-04-09 1959-01-21 échafaudage
CA644753A (en) * 1962-07-17 Gester Kurt Steel joist
US3055459A (en) * 1956-01-23 1962-09-25 Los Altos Engineering Co Lifting equipment
US3088562A (en) * 1959-05-20 1963-05-07 Thomas Hoist Company Extensible and contractible joist
US3124223A (en) * 1964-03-10 Klsovec
US3154199A (en) * 1962-09-04 1964-10-27 Mccabe Powers Body Company Single boom derrick units
US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3300060A (en) * 1965-02-03 1967-01-24 Pettibone Mulliken Corp Booms with sequential hydraulic extension
US3315821A (en) * 1966-03-15 1967-04-25 Grove Mfg Co Four-section fully hydraulically operated boom
FR1492931A (fr) * 1966-05-11 1967-08-25 Grue à flèche télescopique
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
US3398492A (en) * 1966-12-21 1968-08-27 Nat Crane Corp Extendable boom
US3516553A (en) * 1968-09-25 1970-06-23 Tel E Lect Boom construction

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA644753A (en) * 1962-07-17 Gester Kurt Steel joist
US3124223A (en) * 1964-03-10 Klsovec
DE1009373B (de) * 1953-05-11 1957-05-29 Walter Alfred Golka Teleskopausleger
US3055459A (en) * 1956-01-23 1962-09-25 Los Altos Engineering Co Lifting equipment
FR1171016A (fr) * 1957-04-09 1959-01-21 échafaudage
US3088562A (en) * 1959-05-20 1963-05-07 Thomas Hoist Company Extensible and contractible joist
US3154199A (en) * 1962-09-04 1964-10-27 Mccabe Powers Body Company Single boom derrick units
US3300060A (en) * 1965-02-03 1967-01-24 Pettibone Mulliken Corp Booms with sequential hydraulic extension
US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3315821A (en) * 1966-03-15 1967-04-25 Grove Mfg Co Four-section fully hydraulically operated boom
FR1492931A (fr) * 1966-05-11 1967-08-25 Grue à flèche télescopique
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
US3398492A (en) * 1966-12-21 1968-08-27 Nat Crane Corp Extendable boom
US3516553A (en) * 1968-09-25 1970-06-23 Tel E Lect Boom construction

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804262A (en) * 1972-09-18 1974-04-16 Harnischfeger Corp Telescopic boom
US3807108A (en) * 1972-09-18 1974-04-30 Harnischfeger Corp Structural design of boom section with inverted {37 a{38 {11 frame cross-section
US3985234A (en) * 1973-12-20 1976-10-12 Creusot-Loire Telescopic boom for a crane
US3890757A (en) * 1974-02-28 1975-06-24 Case Co J I Boom members having stiffener elements for crane boom constructions
US4016688A (en) * 1975-05-27 1977-04-12 Fmc Corporation Extensible crane boom structure
US4003168A (en) * 1975-06-27 1977-01-18 Walter Kidde & Company, Inc. Crane boom of trapezoidal boom sections having reinforcing rings
US4171597A (en) * 1976-01-29 1979-10-23 Coles Cranes Limited Crane boom and telescopic section for it
US4112649A (en) * 1977-08-26 1978-09-12 Harnischfeger Corporation Boom section for telescopic crane boom
US4168008A (en) * 1978-02-23 1979-09-18 Granryd Tod G Telescopic crane boom having corrugated boom sections
US4257201A (en) * 1979-04-19 1981-03-24 American Hoist & Derrick Company Self-centering telescoping beams
US4417424A (en) * 1980-01-07 1983-11-29 Jacobson Darwin J Segmented extendible boom
US4478014A (en) * 1981-12-14 1984-10-23 Fmc Corporation Telescopic boom with angled corner construction
US4550787A (en) * 1983-07-05 1985-11-05 Alexander Stefan Earth boring machine and working crane
US5465854A (en) * 1993-07-30 1995-11-14 Par Systems, Inc. Telescoping tube assembly
US5762467A (en) * 1996-04-26 1998-06-09 Par Systems, Inc. Underground storage tank manipulator
US6349489B1 (en) * 1997-07-15 2002-02-26 Komatsu Ltd. Structure for working unit for bucket excavators and method for manufacturing the same
US6561368B1 (en) 2000-05-01 2003-05-13 Par Systems, Inc. Telescoping tube assembly with a cabling system
US20020045172A1 (en) * 2000-06-30 2002-04-18 Sturm Albert J. Segmented support structure and method and fixture for making the same
US7172532B2 (en) * 2001-01-19 2007-02-06 Nautilus, Inc. Exercise device tubing
US20040248701A1 (en) * 2001-01-19 2004-12-09 Nautilus, Inc. Exercise device tubing
US6726437B2 (en) 2002-02-08 2004-04-27 Clark Equipment Company Telescoping loader lift arm
US20030171191A1 (en) * 2002-03-06 2003-09-11 Nautilus, Inc. Exercise bicycle handlebar
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
US20060010689A1 (en) * 2004-07-14 2006-01-19 Ali Salour Automated drill process for two-diameter holes in multi-layer variable thickness composite materials
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
US20070098536A1 (en) * 2005-10-31 2007-05-03 Kooima Roger D Extendable telescoping boom and method of manufacturing
US7624967B1 (en) 2006-04-19 2009-12-01 Par Systems, Inc. Opposed-rope hoist driven telescoping mast
US20080035010A1 (en) * 2006-08-14 2008-02-14 Mckay Douglas Mcgregor Trapezoidal strong back beam system
US7284947B1 (en) * 2006-10-26 2007-10-23 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
US7470101B2 (en) * 2006-10-26 2008-12-30 Superior Industries, L.L.C. Braced telescoping support strut and system
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Also Published As

Publication number Publication date
GB1292020A (en) 1972-10-11
ZA711696B (en) 1971-12-29
BE764815A (fr) 1971-08-16
NL157576B (nl) 1978-08-15
NL7104105A (fr) 1972-03-30
DE2114501A1 (de) 1972-03-30
CA934330A (en) 1973-09-25
ES202409U (es) 1975-11-16
NL157576C (nl) 1981-10-16
ES202409Y (es) 1976-03-01
DE2114501B2 (de) 1973-10-31
FR2108227B1 (fr) 1975-04-18
FR2108227A1 (fr) 1972-05-19

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