US3856151A - Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween - Google Patents

Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween Download PDF

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Publication number
US3856151A
US3856151A US00420168A US42016873A US3856151A US 3856151 A US3856151 A US 3856151A US 00420168 A US00420168 A US 00420168A US 42016873 A US42016873 A US 42016873A US 3856151 A US3856151 A US 3856151A
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US
United States
Prior art keywords
boom
cable
section
assembly
crane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00420168A
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English (en)
Inventor
G Lamer
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
Priority to US00420168A priority Critical patent/US3856151A/en
Priority to CA206,830A priority patent/CA1002003A/en
Priority to ZA00746742A priority patent/ZA746742B/xx
Priority to DE19742453592 priority patent/DE2453592A1/de
Priority to GB4913474A priority patent/GB1433448A/en
Priority to BR9543/74A priority patent/BR7409543A/pt
Priority to FR7438865A priority patent/FR2252975B1/fr
Priority to JP13697074A priority patent/JPS5546357B2/ja
Application granted granted Critical
Publication of US3856151A publication Critical patent/US3856151A/en
Anticipated expiration legal-status Critical
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
    • B66C23/82—Luffing gear
    • 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
    • B66C23/702—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic with a jib extension boom

Definitions

  • ABSTRACT This application discloses a crane having an extensible boom consisting of a plurality of boom sections telescoped through power means and a jib assembly pivot ally connected to the outer end of the outer or tip section of the boom.
  • the jib assembly is automatically held in a fixed angular position with respect to the boom by a cable assembly while the boom is extended and retracted.
  • the cable assembly includes a cable having one end connected to the inner end of the tip section of the boom and entrained over a plurality of pulleys rotatable on the remaining sections of the boom with the opposite end connected to the free end of a mast structure pivoted on the outer end of the tip boom section.
  • the mast structure is connected to the outer end of the jibassembly through a further cable.
  • the cable assembly will automatically hold the jib assembly at a predetermined angle while the boom sections are extended and retracted relative to each other.
  • the present invention relates generally to cranes and more particularly to an improvement in a crane of the type disclosed in U.S. Pat. No. 3,732,988.
  • the most common manner of supporting the jib assembly on the outer end of the crane boom is to pivotally connect the inner end of the jib assembly to the outer end of the outer boom section.
  • the freely pivoted jib assembly is then held in a fixed position with respect to the outer boom section by a cable that has one end connected to the outer end of the jib assembly and the opposite end connected to a mast structure supported on the outer end of the outer boom section.
  • the mast structure is also freely pivoted on the boom section and is held in a fixed position by a further cable that extends from the mast structure to another portion of the crane boom, usually the inner end thereof.
  • This arrangement substantially restricts the versatility of theentire unit when the jib assembly is connected to the outer end of the crane boom.
  • the effective length of the crane boom is changed, it is necessary to also change the effective length of the cable or backstay line that extends from the crane boom to the mast structure.
  • the present invention incorporates an automatic adjustment means forthe backstay line that supports the jib assembly on the outer end of an adjustable crane boom so thatthe effective length of the backstay line or cable is automatically adjusted to correspond to the effective length of the crane boom as the crane boom sections are extended and retracted relative to each other. This results in having the jib assembly at the same angular position with respect to the boom while the boom sections are being extended and retracted.
  • the cable assembly consists of a single cable that has one end connected to the jib assembly and an opposite end connected to the outer end or tip section of the boom and a plurality of freely rotatable pulleys on each of the other boom sections with the cable entrained over the pulleys.
  • the pulleys are arranged so that the effective length of the cable assembly between the inner end of the outer boom section and the jib assembly is always equal to the adjusted length of the boom.
  • FIG. 1 shows a fragmentary side view of a selfpropelled crane having the present incorporated therein with many of the conventional crane elements shown in phantom;
  • FIG. 2 is a schematic illustration of the crane boom and jibassembly'
  • FIG. 3 is an exploded view of the crane boom and jib assembly showing the boom ina'retracted position.
  • FIG. 1 there is disclosed a crane consisting of a vehicle 10 having a boom 12, the inner end of which is pivoted about a horizontal axis defined by a pin 14 on a turntable 16.
  • Turntable l6- is supported for rotation on a vertical axis on a frame '20 having a plurality of outriggers 22 located at each of the corners to raise the entire frame a sufficient distance to space-wheels 24 about the ground.
  • .Boom 12 includes a main or inner boom section 30, at least one intermediate boom section 32 and an outer end or tip section 34.
  • the respective boom sections are telescoped with respect to each other for extension and retraction through-suitable power means 36 that has been illustrated as a pair of fluid rams 38 each of which has a pair of extensible and retractable elements interposed between adjacent pairs of boom sections.
  • Power means 36 may take any suitable form but is I preferably of the type disclosed and claimed in U.S. Pat. No. 3,657,969, assigned to the assignee of the present invention. Portions of that disclosure not inconsistent with this disclosure are incorporated herein by reference. As is disclosed in this patent, the crane boom 12 is adapted to be pivoted above pivot pin 14 through a suitable fluid ram (not shown).
  • Crane 10 also includes a jib assembly 40 that is freely pivoted by pin 42 on the outer end of tip section 34 and is held in an angular adjusted position with respect to boom 12 by a cable assembly 44.
  • Cable assembly 44 consists of a first cable 46 having one end attached to the outer end of jib assembly 40 and its opposite end connected to one end of a mast structure 48 that is pivoted at 50 on the'outer end of outer boom section or tip section 34.
  • the jib assembly 40, cable 46' and mast structure 48 may be of the type disclosed in U.S. Pat. No. 3,732,988.
  • the remainder of the cable assembly 44 includes a further cable 52 having one end connected to the outer or free end of mast structure 48.
  • the effective length of cable 52 is automatically correlated with the effective length of boom 12 as the sections of boom 12 are extended. and retracted relative to each other.
  • cable 52 is of a fixed length with one end connected at 53 to mast 48 and its opposite end connected at 54 to the inner end of the outer or tip boom section 34.
  • Cable 52 extends forwardly from the connection 54 and is entrained about a first pulley 56 that is freely rotatable on a bracket 58 carried by intermediate boom section 32.
  • the cable then extends rearwardly inside hollow intermediate boom section 32 and is again entrained about a further cable pulley 60 that is freely rotatable on a bracket 62 fixed to the inner end of intermediate boom section 32.
  • Cable 52 then extends forwardly and is entrained about a further pulley 64 that is freely rotatable on a bracket 66 that is carried adjacent the forward end of base or inner end section 30.
  • Cable 52 then extends rearwardly within inner boom section and is entrained over a pulley 68 supported on a bracket 70 carried by the boom. Cable 52 may also extend around a further pulley 72 that is transversely spaced from pulley 68 and is rotatably supported by a bracket 74 carried by the upper end of inner boom section 30. Bracket 74 is positioned to have the upper periphery of pulley 72 located outside the boom section 30 so that there is an unrestricted portion of cable 52 between the inner end of inner boom section 30 and mast 48.
  • the effective length of cable 52 between mast 48 and pulley 72 will at all times be equal to the effective length of boom 12. For example, as the boom sections 30-32 and 34 are extended relative to each other, the overlapping portions within each boom section are decreased and this overlapping portion of the cable is then located outside the boom 12 and increases the effective length of cable 52 between mast 48 and pulley 72.
  • the present invention provides a simple and inexpensive expedient for automatically maintaining jib assembly at a predetermined angular position with respect to boom 12 as the effective length of boom 12 is varied.
  • pulley 68 could be eliminated without changing the operation of the system.
  • a crane including an extensible boom having a plurality of longitudinal hollow boom sections telescoped for extension and retraction with said boom including at least a base section and a tip section having a free end, power means for extending and retracting said boom section relative to each other, a jib assembly having one end pivotally connected adjacent said free end of said tip section, a cable assembly supporting said jib assembly in a predetermined angular position with respect to said boom, said cable assembly having one end connected to said jib assembly at a location spaced a substantial distance from the pivotal connection, said cable assembly having an opposite end connected inside said tip section.
  • said extensible boom includes an intermediate. section between said base section and said tip section with said plurality of pulleys including a pulley adjacent each end of said intermediate section and a pulley adjacent each end of said base section.
  • said cable assembly includes a mast structure having one end pivotally connected adjacent said free end of said tip section, a first cable having one end connected to an opposite end of said mast and a second .cable of fixed length having one end connected to said opposite end of said mast structure and an opposite end connected tosaid tip section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00420168A 1973-11-29 1973-11-29 Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween Expired - Lifetime US3856151A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00420168A US3856151A (en) 1973-11-29 1973-11-29 Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween
CA206,830A CA1002003A (en) 1973-11-29 1974-08-12 Boom and jib assembly for boom crane
ZA00746742A ZA746742B (en) 1973-11-29 1974-10-23 Boom and jib assembly for boom crane
DE19742453592 DE2453592A1 (de) 1973-11-29 1974-11-09 Kran
GB4913474A GB1433448A (en) 1973-11-29 1974-11-13 Cranes
BR9543/74A BR7409543A (pt) 1973-11-29 1974-11-13 Guindaste
FR7438865A FR2252975B1 (enrdf_load_stackoverflow) 1973-11-29 1974-11-27
JP13697074A JPS5546357B2 (enrdf_load_stackoverflow) 1973-11-29 1974-11-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00420168A US3856151A (en) 1973-11-29 1973-11-29 Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween

Publications (1)

Publication Number Publication Date
US3856151A true US3856151A (en) 1974-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00420168A Expired - Lifetime US3856151A (en) 1973-11-29 1973-11-29 Telescopic boom and jib assembly with means to maintain a predetermined angular position therebetween

Country Status (8)

Country Link
US (1) US3856151A (enrdf_load_stackoverflow)
JP (1) JPS5546357B2 (enrdf_load_stackoverflow)
BR (1) BR7409543A (enrdf_load_stackoverflow)
CA (1) CA1002003A (enrdf_load_stackoverflow)
DE (1) DE2453592A1 (enrdf_load_stackoverflow)
FR (1) FR2252975B1 (enrdf_load_stackoverflow)
GB (1) GB1433448A (enrdf_load_stackoverflow)
ZA (1) ZA746742B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463741A1 (fr) * 1979-08-17 1981-02-27 Coles Cranes Ltd Grue a fleche telescopique comportant un dispositif de rattrapage du mou de ses haubans
DE3117316A1 (de) * 1980-05-01 1982-04-15 Fmc Corp., Chicago, Ill. Kran mit einem ausziehbaren auslegerabschnitt
US4431109A (en) * 1981-02-25 1984-02-14 Fmc Corporation Boom extension stowage system
US4460098A (en) * 1982-06-30 1984-07-17 Fmc Corporation Pendant control system for pendant supported boom
US4467928A (en) * 1982-06-30 1984-08-28 Fmc Corporation Pendant supported boom with fixed and live pendant portions
US4489838A (en) * 1981-08-17 1984-12-25 Fmc Corporation Low droop multi-part pendant supported boom
US4491228A (en) * 1982-06-30 1985-01-01 Fmc Corporation Floating sheave type pendant pay-out system for pendant supported boom
US4491229A (en) * 1981-02-25 1985-01-01 Fmc Corporation Boom extension stowage system
US4492312A (en) * 1982-06-30 1985-01-08 Fmc Corporation External pendant pay-out system with anti-droop control
US4544071A (en) * 1982-06-30 1985-10-01 Fmc Corporation External pendant pay-out system with anti-droop control
US4557391A (en) * 1982-06-30 1985-12-10 Fmc Corporation Method of controlling the angle of a pivotal boom with extensible sections
CN101891121A (zh) * 2009-05-20 2010-11-24 马尼托瓦克起重机有限责任公司 起重机的后拉索展开器
CN101700856B (zh) * 2009-10-30 2013-04-24 上海三一科技有限公司 履带起重机桅杆收放自动控制液压系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6132193U (ja) * 1984-07-27 1986-02-26 株式会社タダノ 継ぎ足しジブの起伏装置
US4936817A (en) * 1988-04-27 1990-06-26 Kraft, Inc. Reclosable bag
FR2799029B1 (fr) 1999-09-24 2002-05-24 Ge Medical Syst Sa Procede de reconstruction d'une image tridimensionnelle d'un objet en mouvement, en particulier une image tridimensionnelle de vaisseaux du coeur humain

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL276437A (enrdf_load_stackoverflow) *
SU185476A1 (ru) * И. И. Колот, В. И. Гладкий, Е. К. Соркин , Ю. К. Гамазенко ГЕНТ Усср iiблйлиотекд
US1920370A (en) * 1931-11-14 1933-08-01 Charles E Forsythe Extension boom for cranes
DE918320C (de) * 1952-01-10 1954-09-23 Franz Putz Bagger, Kran oder aehnliches Geraet mit ausziehbarem Ausleger
US3374901A (en) * 1965-05-06 1968-03-26 Ferwerda Ray Live boom supporting live boom or hoist track
US3622013A (en) * 1969-04-29 1971-11-23 Case Co J I Extensible boom structure
US3658191A (en) * 1970-12-14 1972-04-25 Thomas V Murphy Crane for extracting horizontally-aligned relatively-long tube bundles
US3732988A (en) * 1970-10-12 1973-05-15 Case Co J I Jib assembly for telescoping crane boom

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL276437A (enrdf_load_stackoverflow) *
SU185476A1 (ru) * И. И. Колот, В. И. Гладкий, Е. К. Соркин , Ю. К. Гамазенко ГЕНТ Усср iiблйлиотекд
US1920370A (en) * 1931-11-14 1933-08-01 Charles E Forsythe Extension boom for cranes
DE918320C (de) * 1952-01-10 1954-09-23 Franz Putz Bagger, Kran oder aehnliches Geraet mit ausziehbarem Ausleger
US3374901A (en) * 1965-05-06 1968-03-26 Ferwerda Ray Live boom supporting live boom or hoist track
US3622013A (en) * 1969-04-29 1971-11-23 Case Co J I Extensible boom structure
US3732988A (en) * 1970-10-12 1973-05-15 Case Co J I Jib assembly for telescoping crane boom
US3658191A (en) * 1970-12-14 1972-04-25 Thomas V Murphy Crane for extracting horizontally-aligned relatively-long tube bundles

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392573A (en) * 1879-08-17 1983-07-12 Coles Cranes Limited Tie rope compensation arrangement
FR2463741A1 (fr) * 1979-08-17 1981-02-27 Coles Cranes Ltd Grue a fleche telescopique comportant un dispositif de rattrapage du mou de ses haubans
DE3117316A1 (de) * 1980-05-01 1982-04-15 Fmc Corp., Chicago, Ill. Kran mit einem ausziehbaren auslegerabschnitt
US4352434A (en) * 1980-05-01 1982-10-05 Fmc Corporation Pendant supported hydraulic extensible boom
US4431109A (en) * 1981-02-25 1984-02-14 Fmc Corporation Boom extension stowage system
US4491229A (en) * 1981-02-25 1985-01-01 Fmc Corporation Boom extension stowage system
US4489838A (en) * 1981-08-17 1984-12-25 Fmc Corporation Low droop multi-part pendant supported boom
US4491228A (en) * 1982-06-30 1985-01-01 Fmc Corporation Floating sheave type pendant pay-out system for pendant supported boom
US4467928A (en) * 1982-06-30 1984-08-28 Fmc Corporation Pendant supported boom with fixed and live pendant portions
US4460098A (en) * 1982-06-30 1984-07-17 Fmc Corporation Pendant control system for pendant supported boom
US4492312A (en) * 1982-06-30 1985-01-08 Fmc Corporation External pendant pay-out system with anti-droop control
US4544071A (en) * 1982-06-30 1985-10-01 Fmc Corporation External pendant pay-out system with anti-droop control
US4557391A (en) * 1982-06-30 1985-12-10 Fmc Corporation Method of controlling the angle of a pivotal boom with extensible sections
CN101891121A (zh) * 2009-05-20 2010-11-24 马尼托瓦克起重机有限责任公司 起重机的后拉索展开器
CN101891121B (zh) * 2009-05-20 2014-10-01 马尼托瓦克起重机有限责任公司 起重机的后拉索展开器
CN101700856B (zh) * 2009-10-30 2013-04-24 上海三一科技有限公司 履带起重机桅杆收放自动控制液压系统

Also Published As

Publication number Publication date
JPS5546357B2 (enrdf_load_stackoverflow) 1980-11-22
JPS5085057A (enrdf_load_stackoverflow) 1975-07-09
CA1002003A (en) 1976-12-21
FR2252975B1 (enrdf_load_stackoverflow) 1979-10-12
DE2453592A1 (de) 1975-06-05
GB1433448A (en) 1976-04-28
FR2252975A1 (enrdf_load_stackoverflow) 1975-06-27
ZA746742B (en) 1975-11-26
BR7409543A (pt) 1976-05-25

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