ES418852A1 - Telescopic boom - Google Patents

Telescopic boom

Info

Publication number
ES418852A1
ES418852A1 ES418852A ES418852A ES418852A1 ES 418852 A1 ES418852 A1 ES 418852A1 ES 418852 A ES418852 A ES 418852A ES 418852 A ES418852 A ES 418852A ES 418852 A1 ES418852 A1 ES 418852A1
Authority
ES
Spain
Prior art keywords
boom
sections
hydraulic
hoses
fluid
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
Application number
ES418852A
Other languages
Spanish (es)
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.)
Harnischfeger Corp
Original Assignee
Harnischfeger Corp
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 Harnischfeger Corp filed Critical Harnischfeger Corp
Publication of ES418852A1 publication Critical patent/ES418852A1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

A mobile crane has a boom comprising a plurality of telescopic hollow boom sections. Hydraulic operating cylinders for the boom sections are housed within the boom and each is provided with its own remotely operable electrically controlled main valve. Hydraulic fluid is supplied to the valves by flexible hydraulic fluid hoses disposed between the side plates of adjacent boom sections and the hoses uncoil or coil in a frictionless manner as the sections are extended or retracted. Electric control wires for operating the electric wires are wrapped around the hoses and held in place thereon by heat-shrunk plastic tubing. The boom sections have a cross-sectional configuration which is that of an inverted A-frame or trapezoid to increase boom strength, to provide the maximum ratio between internal component space and weight, and to enable a more compact physical arrangement of the boom and boom hoist cylinders on the crane when the boom is in lowered position. The hydraulic cylinders are progressively smaller in size (proceeding from the base end of the boom to its remote end) to provide a balanced hydraulic system and pressure compensating valve means located between the source of fluid and the first (lowest) cylinder respond to pressure differentials thereat to dump or unload excess fluid as is required to maintain a predetermined pressure differential.
ES418852A 1972-09-18 1973-09-18 Telescopic boom Expired ES418852A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00289986A US3804262A (en) 1972-09-18 1972-09-18 Telescopic boom

Publications (1)

Publication Number Publication Date
ES418852A1 true ES418852A1 (en) 1976-02-16

Family

ID=23114037

Family Applications (1)

Application Number Title Priority Date Filing Date
ES418852A Expired ES418852A1 (en) 1972-09-18 1973-09-18 Telescopic boom

Country Status (14)

Country Link
US (1) US3804262A (en)
JP (1) JPS4970359A (en)
BR (1) BR7307240D0 (en)
CA (1) CA976917A (en)
CH (1) CH560648A5 (en)
DD (1) DD106613A5 (en)
DE (1) DE2346004A1 (en)
ES (1) ES418852A1 (en)
FR (1) FR2200184B3 (en)
GB (1) GB1405387A (en)
IT (1) IT994275B (en)
NL (1) NL7312853A (en)
SE (1) SE394102B (en)
ZA (1) ZA737240B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE402003C (en) * 1976-06-23 1982-02-22 Jonsereds Fabrikers Ab DEVICE FOR LOADING DEVICES WITH TELESCOPICALLY EXTENDABLE CRANE ARM AND WITH HYDRAULIC CABLES BORN BY THE CRANE ARM
GB2263270B (en) * 1992-01-20 1995-01-11 D J Ind Ltd Load handling apparatus
SE501102C2 (en) * 1993-04-26 1994-11-14 Hiab Ab Extendable crane arm
US5695082A (en) * 1996-04-08 1997-12-09 Pioneer Engineering Crane having a readily removable outer boom section
DE10003058A1 (en) * 2000-01-25 2001-07-26 Macmoter Spa Pipe layer has jib mounted on turntable on body of machine so that it can swivel about vertical axis
ITTO20030957A1 (en) * 2003-11-28 2005-05-29 Cnh Italia Spa TELESCOPIC LIFT ARM.
SI2147174T1 (en) * 2007-04-16 2017-11-30 Falck Schmidt Defence System A/S Telescoping mast
ITMO20120312A1 (en) * 2012-12-20 2014-06-20 Cnh Italia Spa TELESCOPIC ARM.
WO2017086844A1 (en) 2015-11-16 2017-05-26 Saab Ab Telescopic device and method for operating a telescopic device
CA3039015C (en) * 2016-12-09 2023-07-04 Fassi Gru S.P.A. Load crane main boom
US20180273352A1 (en) * 2017-03-22 2018-09-27 Wetherell Mfg Co. Sequential piggyback cylinders for extendable boom crane
DE102017127973A1 (en) 2017-11-27 2019-05-29 Liebherr-Werk Ehingen Gmbh Telescopic boom for a crane and crane with a corresponding telescopic boom
IT201800004537A1 (en) * 2018-04-16 2019-10-16 AERIAL PLATFORM
CN109368512B (en) * 2018-12-25 2024-02-20 西京学院 Pulley block range-extending three-stage electric cylinder

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300060A (en) * 1965-02-03 1967-01-24 Pettibone Mulliken Corp Booms with sequential hydraulic extension
US3478894A (en) * 1967-11-27 1969-11-18 Jeffrey Galion Inc Extensible and retractable boom construction for cranes
US3481489A (en) * 1967-12-05 1969-12-02 Robert E Stauffer Means for extending and retracting boom sections of a crane
US3489294A (en) * 1968-04-25 1970-01-13 Bucyrus Erie Co Load limit control for hoisting equipment
US3633460A (en) * 1968-12-13 1972-01-11 Tadano Tekkosho Kk Extension means of a multistage extensible boom
US3605561A (en) * 1969-12-22 1971-09-20 Pettibone Corp One handle sequence selecting valving for crowd cylinders
US3658189A (en) * 1970-01-06 1972-04-25 American Hoist & Derrick Co Hydraulic extensible boom structure
US3666125A (en) * 1970-09-10 1972-05-30 Warner Swasey Co Boom assembly
US3708937A (en) * 1970-09-28 1973-01-09 Kidde & Co Walter Trapezoidal telescoping crane boom
US3736710A (en) * 1970-12-03 1973-06-05 Kidde & Co Walter Four-section fully hydraulically operated crane boom having three individually supported single piston rams contained within fly section

Also Published As

Publication number Publication date
IT994275B (en) 1975-10-20
SE394102B (en) 1977-06-06
DD106613A5 (en) 1974-06-20
NL7312853A (en) 1974-03-20
CA976917A (en) 1975-10-28
FR2200184A1 (en) 1974-04-19
JPS4970359A (en) 1974-07-08
FR2200184B3 (en) 1976-08-20
ZA737240B (en) 1974-10-30
BR7307240D0 (en) 1974-06-27
DE2346004A1 (en) 1974-03-28
GB1405387A (en) 1975-09-10
US3804262A (en) 1974-04-16
CH560648A5 (en) 1975-04-15

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