US3795321A - Telescoping crane boom - Google Patents

Telescoping crane boom Download PDF

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Publication number
US3795321A
US3795321A US00254665A US3795321DA US3795321A US 3795321 A US3795321 A US 3795321A US 00254665 A US00254665 A US 00254665A US 3795321D A US3795321D A US 3795321DA US 3795321 A US3795321 A US 3795321A
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United States
Prior art keywords
section
fly
hole
inner end
pinning
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Expired - Lifetime
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US00254665A
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English (en)
Inventor
R Johnston
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CENTURY II Inc A CORP OF
CENTURY II Inc A DE CORP
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Harnischfeger Corp
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Assigned to CENTURY II, INC., A CORP. OF DE reassignment CENTURY II, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARNISCHFEGER CORPORATION, A CORP. OF DE
Assigned to CENTURY II INC., A DE CORP. reassignment CENTURY II INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARNISCHFEGER CORPORATION, A DE CORP.
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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
    • B66C23/64—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

  • the crane boom comprises four tubular telescopic sections, namely, a first fly section, second and third sections, and a fourth base section.
  • First and second linearly extendable hydraulic rams are located within the boom. The first ram is connected between the base section and the third section to effect movement of the latter. The second ram is connected between the third and second sections to effect movement of the latter.
  • the fly section is detachably connected to the second section.
  • the first ram is used to partially extend the three movable sections.
  • the second ram is used to further extend the first two sections.
  • the first ram is then temporarily attached to the fly section and the fly section is disconnected from the second sec 5 Claims, 15 Drawing Figures PATENTEDMR 51914 3.795.321
  • This invention relates generally to multi-section hydraulically operated telescopic booms such as used on mobile cranes or the like. In particular, it relates to means and method for extending and retracting the outermost fly section of the crane which does not have its own hydraulic operating cylinder or ram.
  • the means and method for extending and retracting the fly section ofa telescopic boom in accordance with the invention contemplate a crane boom having four tubular telescopic sections, namely, a first or fly section telescopic within a second section which, in turn, is telescopic within a third section which, in turn, is telescopic within a fourth or base section.
  • the base section is adapted to be mounted for vertically pivotable movement on a horizontally rotatable crane upper mounted, for example, on a mobile crane unit.
  • First and second linearly extendable and. retractable power means are located within the fly section when the boom is telescoped.
  • Each ram comprises a stationary portion and a movable portion.
  • the stationary portion of the first ram is connected to the inner end of the base section and the inner end of the movable portion of the first ram is connected to the inner end of the third section.
  • the outer end of the movable portion of the first ram is releasably connectible to the inner end of the fly section.
  • the stationary portion of the second ram is connected to the inner end of the third section and the inner end of the movable portion of the second ram is connected to the inner end of the second section.
  • the first, second and third boom sections are provided with pin holes and access holes, as hereinafter explained, which accommodate removable pin means which permit selective connection of the boom sections and the outer end of the movable portion of the first ram.
  • first ram is operated to partially extend the first, second and third sections from the base section and to expose a clearance or access hole in the third section.
  • second ram is operated to extend the first and second sections out of the third section until a clearance hole in the second section and a pin hole in the first section are aligned with the clearance hole in the third section and with a pin hole in the outer end of the movable portion of the first ram.
  • a second pin means is then employed through the clearance hole to secure the inner end of the fly section to the outer end of the movable portion of the first ram.
  • the first pin means are removed to disconnect the first and second sections.
  • the second ram is operated to retract the second section so that the inner end of the first section can be secured through the clearance holes by third pin means to the outer end of the second section.
  • the second pin means are then removed to disconnect the movable portion of the first rarn from the first section.
  • the first or fly section is now secured by the third pin means to the second section in fully extended position and the second and third sections can be operated at will by the second and first rams, respectively.
  • FIG. 1A is a perspective view of a mobile crane employing a crane boom in accordance with the invention
  • FIG. 1 is a side elevational'view of a crane boom in accordance with the invention showing it in horizontal position and with the first three sections partially extended from the base section to expose a clearance hole in the third section;
  • FIG. 2 is a cross-sectional view of the boom in the position shown in FIG. 1;
  • FIGS. 3, 4, 5 and 6 are cross-sectional views of the boom taken on the lines 33, 4-4, 5-5 and 66 of FIG. 2;
  • FIG. 7 is a side elevational view of the boom showing the first and second sections extended from the third section;
  • FIG. 8 is a cross-sectional view of the boom in the position shown in FIG. 7;
  • FIG. 9 is a cross-sectional view of the boom taken on line 99 of FIG. 8;
  • FIG. 10 is a side elevational view of the boom showing the first section extended and the second section retracted into the third section;
  • FIG. 11 is a cross-sectional view of the boom in the position shown in FIG. 10;
  • FIG. 12 is a cross-sectional view of the boom taken on line I2-l2 of FIG. 11',
  • FIG. 13 is a side elevational view of the boom showing all sections extended.
  • FIG. 14 is a cross-sectional view of the boom in the position shown in FIG. 13.
  • FIGS. 1A and l of the drawings there is shown a telescoping crane boom in accordance with the invention and disposed in horizontal position.
  • the boom comprises a tubular first or fly section I, a tubular second section 2 in which first section 1 telescopes, a tubular third section 3 in which second section 2 telescopes, and a tubular fourth or base section 4 in which third section 3 telescopes.
  • Fly section 1 is provided at its outer end with a head 20 on which, for example, a pulley or other working device can be mounted.
  • Base section 4 is provided at its inner end with a mounting bracket 22 by means of which it can be secured for vertical pivotal movement to a horizontally rotatable portion 24 of a mobile crane 26.
  • first and second linearly extendable power means in the form of hydraulic cylinders or rams 6 and 5, are located within fly section 1.
  • first ram 6 comprises a movable portion 6B which has its inner end connected by a pin D to the inner end of third section 3.
  • the movable portion 68 of first ram 6 has a pin hole 8 at its outer end.
  • second ram 5 comprises a stationary portion 5A which is connected by a pin C to the inner end of third section 3. Second ram 5 also com prises a movable portion 5B which has its inner end connected by a pin B to the inner end of second section 2.
  • the rams 5 and 6 are understood to be operable to extended and retracted positions by conventional hydraulic control means.
  • Each boom section is hollow and of rectangular cross sectional configuration.
  • fly section 1 is provided with a pair of pinning holes 7 near its outer end; with a pair of pinning holes 10 near its inner end; and with a pair of pinning holes 9 intermediate pinning holes 7 and 10.
  • second section 2 is provided with a pair of pinning holes 15 near its outer end and with pairs of access or clearance holes 12 and 13; the access holes 12 being nearer the inner end of the second section 2.
  • a third section 3 is provided with a pair of access or clearance holes 11 near its outer end which are always in registry with pinning hole 8 in first ram 6.
  • the pinning holes and access holes hereinbefore described are adapted to receive manually insertable and removable pin means hereinafter identified. Since the boom sections have access holes and pinning holes on opposite sides, the pin means can be inserted from eithcr side.
  • Third section 3 is movable out of fourth section 4 to a position wherein its access holes 11 are visible and accessible. Furthermore, when sections 1 and 2 are aligned so that the pin holes 7 in the former are in registry with the pin holes 15 in the latter, the pin holes 10 in fly section 1 are also aligned with the access holes 12 in second section 2.
  • Fly section 1 is now fixed in its extended position and second and third sections 2 and 3, respectively, which have their own powering rams 5 and 6, respectively, can be fully extended (as shown in FIGS. 13 and 14) or telescoped at will (with fly section always fully extended.
  • first ram 6 place third section 3 so that access hole 11 is visible and accessible beyond the outer end of fourth section 4.
  • second ram 5 operate second section 2 to align access hole 13 therein with access hole 11 in third section 3.
  • Insert second pin means 17 through the access holes 11 and 13 into the pin hole 10 on fly section 1 and the pin holes 8 on ram 6 to secure section 1 and ram 6 together.
  • second ram 5 extend second section 2 until pinning hole 15 in second section 2 (that was previously aligned with pinning hole 9 in first section 1) aligns with pinning hole 7 in first section 1, and access hole 12 in second section 2 is in registry with access hole 11 in third section 3.
  • first pin means 16 into pinning hole 15 in second section 2 and pinning hole 7 in first section 1, to secure the first and second sections 1 and 2 with the former telescoped within the latter.
  • second ram 5 retract second section 2 into third section 3.
  • first ram 6 completely retract section 3 into fourth section 4 and the boom is ready for transport.
  • said third section being provided with at least one access hole therein, said second section being provided with a pinning hole near its outer end and with two spaced apart access holes, and said fly section being provided with pinning holes, one near each end and with another pinning hole intermediate thereof,
  • a first extendable and retractable hydraulic actuator comprising two relatively movable portions, one portion being connected to the inner end of said base section and the other portion being connected to the inner end of said third section,
  • a second extendable and retractable hydraulic actuator comprising two relatively movable portions, one portion being connected to the inner end of said third section and the other portion connected to the inner end of said second section,
  • a boom according to claim 1 wherein the outer end of said first actuator is provided with a pinning hole and wherein, when the access hole in said third section is aligned with the access hole nearer the inner end of said second section when the pinning holes near the outer ends of the fly section and the second section are aligned, the pinning hole near the inner end of said fly section is aligned with said pinning hole in said first actuator and is accessible through the access hole in said third section and the access hole nearer the inner end of said second section.
  • a boom according to claim 2 wherein, when the pinning hole near the outer end of the second section is aligned with the intermediatepinning hole of said fly section, the primary hole near the inner end of said fly section is accessible through the access hole in said third section and through the access hole in the second section which is nearer the outer end of the second section.
  • a telescopic boom having a fly section, a second section, a third section and a base section, said third section being provided with at least one access hole therein, said second section being provided with a pinning hole near its outer end and with two spaced apart access holes, and said fly section being provided with pinning holes, one near each end and with another pinning hole intermediate thereof,
  • a first extendable and retractable hydraulic actuator connected between the inner end of said base section and the inner end of said third section, said first actuator being provided with a pinning hole
  • first means comprising removable pin means for releasably connecting said fly section and said second section with the former retracted within the latter
  • second means comprising removable pin means for releasably connecting said first actuator to the inner end of said fly section
  • third means comprising removable pin means for releasably connecting said fly section and said second section with the former extended from the latter, and wherein when the access hole in said third section is aligned with the access hole nearer the inner end of said second section when the pinning holes near the outer ends of the fly section and the second section are aligned, the pinning hole near the inner end of said fly section is aligned with said pinning hole in said first actuator and is accessible through the access hole in said third section and the access hole nearer the inner end of said second section.
  • a boom according to claim 4 wherein, when the pinning hole near the outer end of the second section is aligned with the intermediate pinning hole of said fly section, the primary hole near the inner end of said fly section is accessible through the access hole in said third section and through the access hole in the second section which is nearer the outer end ofthe second section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00254665A 1972-05-18 1972-05-18 Telescoping crane boom Expired - Lifetime US3795321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25466572A 1972-05-18 1972-05-18

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US (1) US3795321A (cs)
JP (1) JPS5434983B2 (cs)
BR (1) BR7303551D0 (cs)
DE (1) DE2325117A1 (cs)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100707A (en) * 1976-08-25 1978-07-18 O & K Orenstein & Koppel Aktiengesellschaft Telescopic boom for portable cranes
US4396126A (en) * 1980-11-24 1983-08-02 Harnischfeger Corporation Telescoping crane boom
US4434902A (en) 1981-03-05 1984-03-06 Fmc Corporation Apparatus for extending and retracting a manual boom section
US4492311A (en) * 1981-08-17 1985-01-08 Fmc Corporation Coupling and latching mechanism for extensible boom
US4514939A (en) * 1981-08-17 1985-05-07 Fmc Corporation Extensible boom with manual section stored in base
US4585132A (en) * 1984-09-10 1986-04-29 Fmc Corporation Extensible boom with manual section stored in base
US4592474A (en) * 1981-08-17 1986-06-03 Fmc Corporation Coupling and latching mechanism for extensible boom
US4688690A (en) * 1986-03-07 1987-08-25 Harnischfeger Corporation Method and apparatus for extending fly section of crane boom
US4927315A (en) * 1989-03-06 1990-05-22 Chevron, Inc. Vehicle lifting and towing apparatus
US5061149A (en) * 1989-08-17 1991-10-29 Ealgle-Picher Industries, Inc. Fork lift vehicle having a telescopic boom with an articulated jib section capable of vertical and horizontal swinging relative to the boom
US5865327A (en) * 1989-10-24 1999-02-02 J & R Engineering Co., Inc. Hydraulic boom for gantry and the like
US6685038B1 (en) 1999-10-15 2004-02-03 J & R Engineering Company, Inc. Extendible boom with locking mechanism having equalizer arrangement
US20190062129A1 (en) * 2017-08-31 2019-02-28 Matthew Wendell Schroeder Lightweight crane
US20220227608A1 (en) * 2019-03-14 2022-07-21 Tadano Ltd. Expansion device and crane

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921819A (en) * 1974-07-26 1975-11-25 Kidde & Co Walter Boom latch mechanism
DE2926292A1 (de) * 1979-06-29 1981-01-08 Harnischfeger Gmbh Insbesondere mobiler teleskopauslegerkran

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1217041B (de) * 1964-10-01 1966-05-18 Demag Zug Gmbh Teleskopausleger mit einem innerhalb des Auslegers angeordneten Kraftgeraet
DE1268804B (de) * 1965-09-17 1968-05-22 Beteiligungs & Patentverw Gmbh Teleskopausleger
US3386594A (en) * 1967-05-08 1968-06-04 Grove Mfg Company Method of and apparatus for extending a telescopic crane boom
CH476625A (de) * 1967-12-22 1969-08-15 Warner Swasey Co Teleskopischer hydraulisch ausfahrbarer Ladebaum für einen Kran, und Verfahren zum Betrieb des Ladebaumes
US3591016A (en) * 1967-07-19 1971-07-06 Tadano Tekkosho Kk Boom extension means having more than three boom extension members for use with a truck crane
US3633460A (en) * 1968-12-13 1972-01-11 Tadano Tekkosho Kk Extension means of a multistage extensible boom

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4427626Y1 (cs) * 1966-03-30 1969-11-18
JPS4518821Y1 (cs) * 1967-03-03 1970-07-31

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1217041B (de) * 1964-10-01 1966-05-18 Demag Zug Gmbh Teleskopausleger mit einem innerhalb des Auslegers angeordneten Kraftgeraet
DE1268804B (de) * 1965-09-17 1968-05-22 Beteiligungs & Patentverw Gmbh Teleskopausleger
US3386594A (en) * 1967-05-08 1968-06-04 Grove Mfg Company Method of and apparatus for extending a telescopic crane boom
US3591016A (en) * 1967-07-19 1971-07-06 Tadano Tekkosho Kk Boom extension means having more than three boom extension members for use with a truck crane
CH476625A (de) * 1967-12-22 1969-08-15 Warner Swasey Co Teleskopischer hydraulisch ausfahrbarer Ladebaum für einen Kran, und Verfahren zum Betrieb des Ladebaumes
US3633460A (en) * 1968-12-13 1972-01-11 Tadano Tekkosho Kk Extension means of a multistage extensible boom

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100707A (en) * 1976-08-25 1978-07-18 O & K Orenstein & Koppel Aktiengesellschaft Telescopic boom for portable cranes
US4396126A (en) * 1980-11-24 1983-08-02 Harnischfeger Corporation Telescoping crane boom
US4434902A (en) 1981-03-05 1984-03-06 Fmc Corporation Apparatus for extending and retracting a manual boom section
US4492311A (en) * 1981-08-17 1985-01-08 Fmc Corporation Coupling and latching mechanism for extensible boom
US4514939A (en) * 1981-08-17 1985-05-07 Fmc Corporation Extensible boom with manual section stored in base
US4592474A (en) * 1981-08-17 1986-06-03 Fmc Corporation Coupling and latching mechanism for extensible boom
US4585132A (en) * 1984-09-10 1986-04-29 Fmc Corporation Extensible boom with manual section stored in base
FR2595343A1 (fr) * 1986-03-07 1987-09-11 Harnischfeger Corp Procede et appareil pour sortir la volee d'une fleche de grue
US4688690A (en) * 1986-03-07 1987-08-25 Harnischfeger Corporation Method and apparatus for extending fly section of crane boom
US4927315A (en) * 1989-03-06 1990-05-22 Chevron, Inc. Vehicle lifting and towing apparatus
US5061149A (en) * 1989-08-17 1991-10-29 Ealgle-Picher Industries, Inc. Fork lift vehicle having a telescopic boom with an articulated jib section capable of vertical and horizontal swinging relative to the boom
US5865327A (en) * 1989-10-24 1999-02-02 J & R Engineering Co., Inc. Hydraulic boom for gantry and the like
US6330951B1 (en) 1989-10-24 2001-12-18 J&R Engineering Company, Inc. Hydraulic boom for gantry or the like
US6685038B1 (en) 1999-10-15 2004-02-03 J & R Engineering Company, Inc. Extendible boom with locking mechanism having equalizer arrangement
US20190062129A1 (en) * 2017-08-31 2019-02-28 Matthew Wendell Schroeder Lightweight crane
US10894699B2 (en) * 2017-08-31 2021-01-19 Stellar Industries, Inc. Lightweight crane
US20220227608A1 (en) * 2019-03-14 2022-07-21 Tadano Ltd. Expansion device and crane
US11891279B2 (en) * 2019-03-14 2024-02-06 Tadano Ltd. Expansion device and crane

Also Published As

Publication number Publication date
JPS5434983B2 (cs) 1979-10-30
BR7303551D0 (pt) 1974-06-27
JPS4955048A (cs) 1974-05-28
DE2325117A1 (de) 1973-12-06

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Owner name: CENTURY II, INC., A CORP. OF DE, WISCONSIN

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Effective date: 19910130