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US3622013A - Extensible boom structure - Google Patents

Extensible boom structure Download PDF

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Publication number
US3622013A
US3622013A US820121A US3622013DA US3622013A US 3622013 A US3622013 A US 3622013A US 820121 A US820121 A US 820121A US 3622013D A US3622013D A US 3622013DA US 3622013 A US3622013 A US 3622013A
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US
United States
Prior art keywords
section
boom
intermediate section
distal
outer end
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
US820121A
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English (en)
Inventor
Forrest V Swanson
Gerald P Lamer
Lembit Vaerk
John F Wilkinson
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.)
Case LLC
Original Assignee
JI Case 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 JI Case Co filed Critical JI Case Co
Application granted granted Critical
Publication of US3622013A publication Critical patent/US3622013A/en
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
    • B66C23/703—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by flexible elements, e.g. cables, chains or bands

Definitions

  • a crane adapted to be mounted on a truck and including an extensible boom formed of at least three telescopically arranged sections, with the inner or proximal section having an open rearward or inner end pivotally mounted on a support.
  • the boom includes intermediate and distal or outer sections that are retractible to a position where the inner end of the intermediate section is located a substantial distance beyond the inner end of the inner section in a transport position to provide a substantially balanced structure.
  • PATENTEBuuv 23 ⁇ 911 SHEET 2 [IF 3 EXTENSIBLE BOOM STRUCTURE BACKGROUND OF THE INVENTION
  • the sections of the boom are pinned to one another, and great difficulty has been encountered in placing such structure in condition for transportation. For example, in order to place such structures in a road-ready" condition, it is first necessary to lower the boom to the ground, and then uncouple the boom hoist and the load block. The boom extension sections must then be unpinned, and moved to one side, with the boom point section then being placed on skids so as to mate with the boom foot section. The boom point section and boom foot sections are then reassembled, and the extension sections must be loaded on thetruck.
  • the above procedure is time consuming and expensive in terms of man hours, and furthermore, the procedure must essentially be repeated in reverse order to ready the crane for operation.
  • the crane of the present invention has a unique boom structure comprised of a plurality of telescopically arranged sec tions, and the inner or proximal section has an open inner or rearward end, so that the remaining boom sections may be telescoped to a position wherein the center of gravity of the boom structure is substantially coincident with the center of gravity of the truck carrying the crane structure. More particularly, the proximal boom section is of open U-shaped configuration, when viewed in plan, so that the remaining boom sections can move past the pivotal connection of the inner boom section to the upper portion of the crane.
  • the above structure enables the boom to be quickly and easily converted from an operating device to a compact structure for purposes of transportation.
  • FIG. I is a fragmentary side elevational view of an erection crane formed in accordance with the teachings of the present invention, and illustrating the boom sections in a fully extended operating position;
  • FIG. 2 is a fragmentary side elevational view, similar to FIG. I, but showing the boom sections in a partially retracted minimum boom length working position;
  • FIG. 3 is a fragmentary side elevational view similar to FIGS. 1 and 2, but on an enlarged scale and showing the boom structure in a fully retracted road-ready position;
  • FIG. 4 is a top plan view of the boom structure in a retracted position
  • FIG. 5 is a side elevational view of the boom structure in an extended position
  • FIG. 6 is a bottom plan view of the boom structure in an extended position
  • FIGS. 79 are end elevational views illustrating different forms of latticed boom constructions.
  • the improved crane of the present invention is indicated generally at 10 in the drawings, and the crane includes a lower portion 12 adapted to be carried upon an earth traversing vehicle, such as a truck (not shown). Crane 10 further includes an upper portion 14 that is carried upon a turntable 16 which is pivotally mounted upon lower portion 12.
  • a prime mover such as an engine 18 as provided for driving the ground engaging means of the earth traversing vehicle, and power from engine 18 may be utilized to rotate the turntable 16 through conventional drive structure, not shown.
  • a cab 20 provides an operator station on the upper portion 14 of the crane, as is well known.
  • Crane 10 includes a multisection boom 24 consisting of a proximal section 26, an intermediate section 28, and a distal section 30.
  • the boom' sections 26, 28, and 30 are mounted for telescopic movement relative to one another between a fully extended position illustrated in FIG. I, a partially extended minimum boom length working position illustrated in FIG. 2, and a'fully retracted transport position illustrated in FIG. 3.
  • boom sections 28 and 30 can be locked at any intermediate positions between those illustrated in FIGS. 1 and 2.
  • a boom foot support 32 extends upwardly from turntable 16, and the innermost, or boomfoot portion 34 of proximal section 26 is pivotally mounted on support 32 at 36.
  • distal section 30 terminates in a boompoint 38 and a load line 40 extends from boompoint 38 and rearwardly toward the crane upper 12, where it is connected to winches 41.
  • winches 41 function to pay out or take in load line 40 to lower or raise a load, as desired.
  • a jib'44 may optionally be connected to the boom 24 at a pivot 42 on the boompoint 38, and in the event that jib 44 is used, a load line 46 extends downwardly from the outer end thereof and back to the crane upper 12, where it is connected to winches 41. If the jib 44 is used, an upwardly extending backstay strut 45 is pivotally connected to boompoint 38, and a backstay line 47 is connected to the jib, as shown in FIG. 1, for pivoting the jib relative to the main boom 24.
  • Boom sections 26, 28, and 30 are all of open lattice construction, as shown in FIGS. 7-9.
  • the latticed boom structures may be triangular, as shown at 48 in FIG. 7, with the structure including a plurality of longitudinally extending, parallel chords 50 interconnected by inclined lacing members 52.
  • the boom sections may also be generally square, as shown at 54 in FIG. 8, wherein a plurality of longitudinally extending, parallel chord angles 56 are interconnected by inclined lacing tubes or rods 58.
  • a second form of generally square boom structure is shown at 60 in FIG. 9, and the longitudinally extending, parallel chords may take the form of tubes 62 (which may be circular, square or rectangular), or U-shaped channels 62a.
  • Inclined lacing members 64 connect the chords 62 or 6211, and lacing members 64 may be tubes or rods.
  • proximal boom section 26 is larger than that of intermediate section 28, which in turn is larger than the crosssectional dimension of distal boom section 30.
  • Any suitable means such as wear plates, bearings or the like may be associated with boom sections 26 and 28 for guiding and supporting the telescopically arranged sections 28 and 30, respectively.
  • the boom sections illustrated in FIGS. 4-6 are of the FIG. 8 variety, with the subscript a being added to the element of the proximal section 26, the subscript b being added to the elements of the intermediate section 28, and the subscript 0 being added to the elements of the distal section 30.
  • angle members 56a converge rearwardly toward boomfoot 34, and it will be evident from FIG. 4 that no lacing members 580 are provided at the top and bottom of the proximal section 26, so that an open rearward end 66 is provided.
  • Boomfoot 34 is defined by outwardly offset portions 34b (FIG. 6) having openings therein defining the pivot 36 for the boom 24.
  • a generally rectangular sleeve 70 is provided at the outer end of proximal section 26, and sleeve 70 is secured around the outer ends of angles 56a.
  • Locking means 72 is provided at the outer end of sleeve 70 for retaining intermediate section 28 at a selected axial location with respect to proximal section 26, and locking means 72 may be of any kind known to the prior art, such as, for example, a compressive type, or a positive detent type. Illustrative forms of locking mechanisms are shown, for example, in US. Pat. Nos. 2,560,412, 2,819,803, 3,398,645 and 3,171,545.
  • Means 74 is provided for extending intermediate section 28 relative to proximal section 26, and the extending means includes a double drum winch 78 rotatably mounted upon a support 76 that extends downwardly from sleeve 70.
  • First and second cables 80 and 82 are trained over first and second winch drums 84 and 86, respectively, and cables 80 and 82 extend rearwardly and upwardly around first and second sheaves 88 and 90 on the inner or rearward end 92 of intermediate section 28.
  • Cables 80 and 82 extend upwardly from sheaves 88 and 90 around third and fourth sheaves 94 and 96, respectively, that are mounted on the inner end 92 of section 28, and thence forwardly to fifth and sixth sheaves 98 and 100 that are connected to an upstanding support 102 on sleeve 70. Cables 80 and 82 then extend rearwardly where they are attached by cable securement means 104 and 106, respectively, to the inner end 92 of section 28.
  • Suitable motor means 108 is carried by sleeve 70 for rotating winch 78, and sheaves 88, 90, 94, and 96 serve as reaction members, so that when winch 78 is rotated in a counterclockwise direction, section 28 is moved outwardly relative to section 26. While the means 74 for extending section 28 relative to section 26 has been illustrated as including two threepart lines, the number of parts can be altered, as desired. Furthermore, the double drum winch 78 can be mounted on top of section 26, or it can be mounted directly upon the upper portion 14 of the crane. Additionally, chain and sprocket means can be substituted for the illustrated cable and sheave means.
  • the present invention also includes means 110 for extending distal section 30 relative to intermediate section 28.
  • Extending means 110 includes a motor-driven winch 112 secured to the bottom of intermediate section 28 adjacent the outer end thereof.
  • Winch 112 has a single drum 114, and a cable 116 is trained over winch 114, and extends upwardly and forwardly over a sheave 118 that is connected to the outer end of section 28. Cable 116 extends rearwardly from sheave 118 where it is attached by cable securement means 120 to the inner or rearward end 122 of distal section 30.
  • a locking mechanism 124 of conventional design is provided at the outer end of section 28, for positively securing section 30 at a fixed location relative to section 28.
  • Boomhoist means 126 is provided for pivoting boom 24 about pivot 36, and for retracting sections 30 and 28.
  • the boomhoist means is of essentially conventional design, and includes a pendent cable means 128 connected between boompoint 38 and a boomhoist cable means 129 that extends around sheave means on a gantry assembly 130.
  • the boomhoist cable means is connected to a motor-driven boomhoist winch means 132 on the crane turntable 16.
  • the winch 132 is rotated in a counterclockwise direction
  • the boom 24 is pivoted in a counterclockwise direction about pivot 36, assuming that the locking mechanisms 72 and 124 are engaged. If the locking mechanisms 72 and 124 are disengaged, the sections 30 and 28 are telescoped inwardly.
  • the boomhoist means 126 is initially actuated to raise the boom to a near maximum working angle to reduce the boomhoist reaction to the boom.
  • the locking mechanism 124 which locks boom section 30 relative to boom section 28 is then released, and the boom hoist means 126 is taken up while the cable 126 is slacked off until section 30 is fully retracted within section 28.
  • the locking mechanism 72 is then released, and the boomhoist means 126 is taken up while cables and 82 are slacked off until section 28 (with section 30 telescoped into it) reaches the minimum working boom length illustrated in FIG. 2.
  • the partially telescoped boom structure is then lowered from the position of FIG. 2 to a horizontal disposition, and the boomhoist means 126 is again taken up while cables 80 and 82 are slacked off until section 28 reaches the fully retracted position of FIG. 3, with an intermediate portion of section 28 adjacent the forward end thereof resting upon boom supports 136 on the crane upper 14. Slacking off of the boomhoist 126 is continued until the gantry assembly 130 falls into a retracted position, and the crane 10 is then in condition to be transported to a new site.
  • the procedure described in the preceding paragraph is essentially repeated, and the boomhoist means 126 is initially tensioned to raise the gantry assembly 130 into working position, after which the boomhoist is used to raise the retracted boom 24 from the boom supports 136. Extension means is then actuated against the boomhoist tension to extend section 30 relative to section 28 until a predetermined position is reached, at which time locking mechanism 124 is actuated to fixedly secure section 30 relative to section 28. Extension means 74 is then actuated against the boomhoist tension until the lower or inner end of section 28 is forward of the boomfoot support 34 allowing the boom 24 to be raised from the horizontal.
  • the boomhoist means 126 is then actuated to raise the boom to the working angle, and actuation of the extension means 74 is continued until section 28 reaches the desired position relative to section 26.
  • Locking mechanism 72 may then be actuated to positively secure section 28 relative to section 26, but alternatively, section 28 may be supported upon cables 80 and 82 allowing the boom length to be adjusted during the working cycle.
  • the crane of the present invention can easily and quickly be readied for transporting, and all of the road-readying steps can be performed by a single individual from the operator's cab.
  • a ground traversing vehicle defining a support structure; an extensible boom including a proximal section, a distal section, and at least one intermediate section, said sections being positioned in telescoping relationship with respect to one another; means mounting one end of said proximal section on said support structure for pivotal movement about a horizontal axis between a horizontal position and positions inclined with respect thereto; first independent means for moving said intermediate section outwardly relative to said proximal section, said first independent means including at least one cable connected to said intermediate section adjacent the inner end thereof, a winch adjacent the outer end of said proximal section and receiving said cable therearound, and pulley means guiding said cable from said winch to said intermediate section; locking means for retaining said intermediate section at selected positions relative to said proximal section; second independent means for moving said distal section outwardly relative to said intermediate section, and second independent means including a cable connected adjacent the inner end of said distal section, a winch adjacent the outer end of said intermediate section and receiving
  • the means for retracting said distal section and said intermediate section includes a boomhoist structure connected between said support structure and distal section for pivoting said boom about said axis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US820121A 1969-04-29 1969-04-29 Extensible boom structure Expired - Lifetime US3622013A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82012169A 1969-04-29 1969-04-29

Publications (1)

Publication Number Publication Date
US3622013A true US3622013A (en) 1971-11-23

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US820121A Expired - Lifetime US3622013A (en) 1969-04-29 1969-04-29 Extensible boom structure

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US (1) US3622013A (de)
JP (1) JPS4841295B1 (de)
DE (1) DE2018064A1 (de)
FR (1) FR2040348B1 (de)
GB (1) GB1245900A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792781A (en) * 1970-03-28 1974-02-19 Rheinstahl Union Ag Hydraulic traveling crane construction
US3856151A (en) * 1973-11-29 1974-12-24 Case Co J I Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween
US3942554A (en) * 1974-04-19 1976-03-09 Werner Corporation Extendable crane with folding conduit
US4267675A (en) * 1979-05-04 1981-05-19 Joe R. Brown Well working rig
US6460307B1 (en) * 2000-11-22 2002-10-08 Blain, Iii Douglas H. Boom attachment for a prime mover
US6508019B1 (en) * 1997-07-15 2003-01-21 Komatsu Ltd. Boom of bucket type excavator and method for making same
US20030126772A1 (en) * 2002-01-04 2003-07-10 Komatsu Ltd Long structural member

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491228A (en) * 1982-06-30 1985-01-01 Fmc Corporation Floating sheave type pendant pay-out system for pendant supported boom
DE3316365A1 (de) * 1983-05-05 1984-11-08 Mannesmann AG, 4000 Düsseldorf Schnellmontage-ausleger fuer einen fahrzeugkran
DE29720972U1 (de) * 1997-11-26 1999-03-25 Ec Engineering + Consulting Spezialmaschinen Gmbh, 89079 Ulm Teleskopierbarer Ausleger

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US763969A (en) * 1902-10-01 1904-07-05 George R Dodd Pole-hoister.
US2698096A (en) * 1953-05-04 1954-12-28 Lillie V Hughes Drag line extensible boom
GB871100A (en) * 1959-03-12 1961-06-21 Liebherr Hans Mobile crane
US3307713A (en) * 1964-02-13 1967-03-07 Greater Iowa Corp Telescoping boom for material handling mechanism
US3308967A (en) * 1965-10-06 1967-03-14 Byron F Barkley Extensible boom crane
GB1081007A (en) * 1964-04-29 1967-08-31 Richier Sa Improvements in or relating to folding tower cranes
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
GB1130242A (en) * 1966-03-11 1968-10-09 Lars Rickard Andersson Improvements in or relating to mobile cranes
FR1546917A (fr) * 1967-03-11 1968-11-22 Engin de levage mobile, notamment grue automobile
US3465899A (en) * 1967-08-03 1969-09-09 Bucyrus Erie Co Telescoping boom for hydraulic crane

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2819803A (en) * 1954-10-12 1958-01-14 Leo B Obenchain Boom for cranes

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US763969A (en) * 1902-10-01 1904-07-05 George R Dodd Pole-hoister.
US2698096A (en) * 1953-05-04 1954-12-28 Lillie V Hughes Drag line extensible boom
GB871100A (en) * 1959-03-12 1961-06-21 Liebherr Hans Mobile crane
US3307713A (en) * 1964-02-13 1967-03-07 Greater Iowa Corp Telescoping boom for material handling mechanism
GB1081007A (en) * 1964-04-29 1967-08-31 Richier Sa Improvements in or relating to folding tower cranes
US3308967A (en) * 1965-10-06 1967-03-14 Byron F Barkley Extensible boom crane
GB1130242A (en) * 1966-03-11 1968-10-09 Lars Rickard Andersson Improvements in or relating to mobile cranes
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
FR1546917A (fr) * 1967-03-11 1968-11-22 Engin de levage mobile, notamment grue automobile
US3465899A (en) * 1967-08-03 1969-09-09 Bucyrus Erie Co Telescoping boom for hydraulic crane

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792781A (en) * 1970-03-28 1974-02-19 Rheinstahl Union Ag Hydraulic traveling crane construction
US3856151A (en) * 1973-11-29 1974-12-24 Case Co J I Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween
US3942554A (en) * 1974-04-19 1976-03-09 Werner Corporation Extendable crane with folding conduit
US4267675A (en) * 1979-05-04 1981-05-19 Joe R. Brown Well working rig
US6508019B1 (en) * 1997-07-15 2003-01-21 Komatsu Ltd. Boom of bucket type excavator and method for making same
US6637111B2 (en) 1997-07-15 2003-10-28 Komatsu Ltd. Method for making a boom of an excavator
US6460307B1 (en) * 2000-11-22 2002-10-08 Blain, Iii Douglas H. Boom attachment for a prime mover
US20030126772A1 (en) * 2002-01-04 2003-07-10 Komatsu Ltd Long structural member

Also Published As

Publication number Publication date
GB1245900A (en) 1971-09-08
FR2040348A1 (de) 1971-01-22
DE2018064A1 (de) 1970-11-05
JPS4841295B1 (de) 1973-12-05
FR2040348B1 (de) 1974-10-11

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