US3863406A - Drive mechanism for jib cranes - Google Patents

Drive mechanism for jib cranes Download PDF

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Publication number
US3863406A
US3863406A US404550A US40455073A US3863406A US 3863406 A US3863406 A US 3863406A US 404550 A US404550 A US 404550A US 40455073 A US40455073 A US 40455073A US 3863406 A US3863406 A US 3863406A
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United States
Prior art keywords
jib
extension
main
roller
piston rod
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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US404550A
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English (en)
Inventor
Donald J Quick
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.)
Navistar International Corp
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International Harverster Corp
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Publication date
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Assigned to NAVISTAR INTERNATIONAL CORPORATION reassignment NAVISTAR INTERNATIONAL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL HARVESTER COMPANY
Assigned to NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE reassignment NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). Assignors: NAVISTAR INTERNATIONAL TRANSPORTATION CORP. (MERGED)
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
    • B66C23/64—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
    • B66C23/706—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by other means
    • 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
    • B66C23/54—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 with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors

Definitions

  • a drive mechanism for an extensible crane jib having a main jib section and an extension jib section arranged in a telescopic relation, said drive mechanism comprising at least two spaced rollers engaging opposite faces of the extension jib section, drive means coupled to at least one roller to effecting movement of the extension jib section relative to the main jib section to extend or retract the extension jib section, and brake means operable to lock the extension jib section relative to the main jib extension and releasable in response to energisation of the drive means.
  • the drive means includes an hydraulic motor and the brake means is adapted to be hydraulically released, the hydraulic circuits of the motor and brake means are interconnected so that the brake means is released when the motor is energised.
  • the pressure required to operate the hydraulic motor is also fed to a piston operated brake pad.
  • the hydraulic motor which is operated by fluid pressure from the crane pump, and a valve is provided to control the direction of rotation of the motor.
  • a chain and sprocket drive connects the motor with a roller disposed on the upper side of the extension jib section and two rollers disposed on the lower side thereof.
  • the upper roller is supported on a frame pivotally supported on the main jib section and is connected to a hydraulical cylinder which is alos connected to the pressure line of the motor, so that when the motor is operating the upper roller is pressed into driving contact with the extension jib section.
  • this hydraulic cylinder may be replaced by a spring load of sufficient force to maintain the required driving contact.
  • the jib of the crane may be raised by increasing the inclination of the jib to the horizontal. As the inclination to the horizontal is increased, the motor torque required to extend it will also increase, and the contact pressure between the rollers and the extension section would decrease. By the use of the hydraulic cylinder to apply clamping pressure to the roller, the grip on the jib extension is maintained by the hydraulic pressure in the motor circuit.
  • the present invention provides an extendable job drive mechanism which avoids the need for a hydraulic extension cylinder and allows for the incorporating of a longer extension section. Also the weight of the extension jib section, and hence the stability of the crane is not varied by the weight of the hydraulic fluid or the extension of the hydraulic ram as with prior art cranes.
  • FIG. I is a diagrammatic representation of a typical extendable crane jib located in the normal horizontal position
  • FIG. 2 is a view similar to FIG. 1 with the jib in an elevated position;
  • FIG. 3 is an enlarged view of the forward end of the jib, partly in section, showing the drive and brake mechanisms;
  • FIG. 4 is a sectional view along line 4-4 in FIG. 3.
  • the jib crane comprises a main jib 6 pivotally supported at 7 to the crane frame 8 with the lift cylinder 9, connected between the main jib 6 and a portion of the frame not shown, so that the main jib may be pivoted relative to the frame by extending or retracting the cylinder 9.
  • the jib extension 12 Slidably supported within the main jib 6 is the jib extension 12 which may be extended or retracted in a telescopic fashion to vary the effective length of the jib.
  • the jib extension 12 is supported in the main jib l6 and guided during its movement by the stabilizing rollers 13 supported in the main jib and the rollers 16,17 and 18 forming part of the drive mechanism 14 at the forward end of the main jib 6.
  • the jib extension 12 rests on the rollers 17 and 18 so that the latter engage the underface of the jib extension and the roller 16, which is substantially vertical above the roller 17, engages the top face of the jib extension.
  • the main jib 6 is of a generally box type construction with the jib extension 12 located therein in a telescoped relation.
  • the two rollers 17 and 18 engaging the underside of the jib extension 12 are supported in respective pairs of bearings 20 mounted in opposite sides of the main jib.
  • the roller 16 is supported in bearings 29 carried in respective arms 28 located externally of the main jib 6.
  • Each of the arms 28 are pivoted to the main jib 6 on a common axis 31, parallel to the axis of the roller 16. At the other end the arms 28 are interconnected by a cross member 32 extending through the main jib 6.
  • the single acting hydraulic cylinder 33 is attached to the main jib 6 with the piston rod thereof connected to the cross member 32 so that when fluid is applied to the hydraulic cylinder 33, the arms 28 pivot relative to the main jib 6 to cause pressure engagement between the roller 16 and the upper face of the jib extension 12.
  • the reaction to the pressure applied through the roller 16 is taken by the rollers 17 and 18 so that in effect the application of pressure to the hydraulic cylinder 33 causes pressure contact between the three rollers and the jib extension 12.
  • the hydraulic cylinder 33 is interconnected with the hydraulic circuit of the motor 26 so that when the motor is operated fluid under pressure is delivered to the hydraulic cylinder 33 so as to establish pressure contact between the rollers and the jib extension during the driving operation.
  • Each roller has an axial extension at one end carrying respective sprockets 21, 22 and 23 coupled by the chain 24 to the sprocket 25 mounted on the shaft of the hydraulic motor 26.
  • the chain 24 is engaged by the sprocket 21 driving the roller 16 on the external side of the chain, whilst the sprockets 22 and 23 driving the rollers 17 and 18 engage the innerside of the chain so that rollers 17 and 18 rotate in the opposite direction to the roller 16.
  • the three rollers in fact drive the jib in the same direction.
  • the hydraulic motor 26 is reversible and is controlled by the valve 30 so that the jib extension may be extended or retracted by the operation of the hydraulic motor 26 driving the rollers l6, l7 and 18.
  • the brake mechanism comprises the back plate 36 carrying the friction pad 37, and the hydraulic cylinder 38 connected via the piston rod 39 to the back plate 36.
  • the hydraulic cylinder 38 is rigidly attached to the main jib 6, and the pair of pressure springs 40 are interposed between the cylinder and the pressure plate 42 carried by the piston rod 39.
  • the springs 40 urge the friction pad via the back plate 36 and pressure plate 42 into frictional contact with the upper face of the jib extension 12, and thus acts as a brake to hold the jib extension 12 in the desired position relative to the main jib 6.
  • the hydraulic cylinder 38 is a single acting cylinder with hydraulic fluid being admitted to the underside of the piston as viewed in FIG. 3, to raise the piston, and hence raise the back plate and friction pad, against the action of the springs 40 to release the jib extension for extending or retracting movement relative to the main jib.
  • the hydraulic cylinder 38 which releases the brake mechanism 35 is connected to the hydraulic circuit of the motor 26 so that whenever the motor is operated to extend or retract the jib extension, fluid pressure is applied to the underside of the piston to raise the friction pad, and thus release the brake on the jib exten- SlOIl.
  • the extension would tend to retract under gravity without operation of the motor.
  • pressure is required in the hydraulic circuit of the motor.
  • the one way pressure valve 45 is provided in the return line 46 of the motor hydraulic circuit so that any rotation of the motor will develop pressure in the return line sufficient to release the brake, and cause the rollers to grip the jib extension. This arrangement ensures that retraction of the jib extension is at all times under the control of the motor.
  • a crane having an elongated cantilevered main jib of the box type construction, an extendable and retractable elongate extension jib of uniform rectangular cross section telescopically mounted within the main jib, hydraulic power means including means for selectively energizing the power means for telescopically extending and retracting the extension jib, and securing means for holding the extension jib in place following telescopic movement, the improvement comprising:
  • a U-shaped lever having the ends of the extending arms of the U hinged to the lateral sides of the main jib and the cross-member of the U passing transversely through the lateral sides of the main jib;
  • a first roller mounted on a first shaft passing transversely through the lateral sides of the main jib and being journalled to the arms of the U-shaped lever, the first roller sitting on top of the extension jib;
  • a second roller mounted on a second shaft passing transversely through and being journalled to the latteral sides of the main jib and supporting the bottom of the extension jib, the axis of the second shaft being vertically aligned with the axis of the first shaft;
  • a third roller spaced horizontally from and parallel with the second roller and being mounted on a third shaft passing transversely through and being journalled to the lateral sides of the main jib and supporting the bottom of the extension jib;
  • a pulley wheel keyed to each shaft including a continuous belt means drivingly connecting the pulley wheels to the hydraulic power means for rotating the rollers in unison and telescopically moving the extension jib upon energization of the hydraulic power means;
  • first and second hydraulic power ram means mounted on the main jib and each having first and second piston rod means respectively and being hydraulically connected to the hydraulic power means for simultaneous energization of the piston rod means with the power means, the first piston rod means being connected to the brake shoe for lifting the brake shoe from the extension jib upon energization thereof, the second piston rod means being connected to the cross-member of the U for swinging the arms of the U upon energization thereof and squeezing the extension jib between the rotating rollers; and
  • the pulley wheels comprise sprocket gears of identical size and the endless belt is a chain trained about the sprocket gears, and the hydraulic power means includes a sprocket gear drivingly connected to the chain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US404550A 1972-10-09 1973-10-09 Drive mechanism for jib cranes Expired - Lifetime US3863406A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB074872 1972-10-09

Publications (1)

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US3863406A true US3863406A (en) 1975-02-04

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US404550A Expired - Lifetime US3863406A (en) 1972-10-09 1973-10-09 Drive mechanism for jib cranes

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US (1) US3863406A (enrdf_load_html_response)
CA (1) CA986060A (enrdf_load_html_response)
FR (1) FR2202025B1 (enrdf_load_html_response)
GB (1) GB1437526A (enrdf_load_html_response)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2812177A1 (de) * 1977-03-21 1978-10-05 Jonsereds Fabrikers Ab Einrichtung an einem hydraulisch betriebenen kran
US4285629A (en) * 1978-05-18 1981-08-25 Elliston Thomas L Fire fighting boom assembly for service vessel
US4390315A (en) * 1978-05-18 1983-06-28 Hydra Rig Incorporated Fire fighting boom assembly for service vessel
US4699281A (en) * 1984-03-15 1987-10-13 Kabushiki Kaisha Hikoma Seisakusho Telescopic boom mechanism
US4757968A (en) * 1986-02-10 1988-07-19 Orion-Yhtyma Oy Apparatus for implementation of vertical movement of a chair, especially of a patient chair
US6062404A (en) * 1996-12-20 2000-05-16 Grove U.S. L.L.C. Device and method for arresting sections of a telescopic jib
US6164468A (en) * 1998-06-17 2000-12-26 Grove U.S. L.L.C. Jib positioning with hydraulic adjustment cylinder
US20040040924A1 (en) * 2001-01-22 2004-03-04 Christian Reifenscheid Mobile crane comprising a telescopic jib
CN102659039A (zh) * 2012-05-11 2012-09-12 徐工集团工程机械股份有限公司 损伤力消减装置以及用于起重机的变幅装置
WO2017151021A1 (en) * 2016-02-29 2017-09-08 Saab Ab A fluid actuator arrangement comprising a lifting member

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6627898B2 (ja) * 2018-02-16 2020-01-08 株式会社タダノ クレーン

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611326A (en) * 1924-04-07 1926-12-21 Elwell Parker Electric Co Extensible boom
US2703634A (en) * 1949-04-30 1955-03-08 Hopper Machine Works Inc Portable derrick
US2992710A (en) * 1958-06-26 1961-07-18 Victoria Foundry Company Ltd Sectional mast and elevating means therefor
US3055459A (en) * 1956-01-23 1962-09-25 Los Altos Engineering Co Lifting equipment
US3236393A (en) * 1964-03-25 1966-02-22 Girardi Antonio Lawrence Boom and boom actuating mechanism
US3319803A (en) * 1966-04-12 1967-05-16 Fairey Canada Ltd Retractable chain boom
US3346281A (en) * 1965-01-29 1967-10-10 Washington Iron Works Lock mechanism for telescoping spar
US3465904A (en) * 1966-11-18 1969-09-09 Massey Ferguson Services Nv Adjustable boom for material handling equipment
US3480109A (en) * 1968-01-15 1969-11-25 Telsta Corp Lifting equipment
US3670465A (en) * 1969-04-21 1972-06-20 Ppm Sa Telescopic jibs
US3800965A (en) * 1972-01-11 1974-04-02 H Pavone Ladle skimming mechanism

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611326A (en) * 1924-04-07 1926-12-21 Elwell Parker Electric Co Extensible boom
US2703634A (en) * 1949-04-30 1955-03-08 Hopper Machine Works Inc Portable derrick
US3055459A (en) * 1956-01-23 1962-09-25 Los Altos Engineering Co Lifting equipment
US2992710A (en) * 1958-06-26 1961-07-18 Victoria Foundry Company Ltd Sectional mast and elevating means therefor
US3236393A (en) * 1964-03-25 1966-02-22 Girardi Antonio Lawrence Boom and boom actuating mechanism
US3346281A (en) * 1965-01-29 1967-10-10 Washington Iron Works Lock mechanism for telescoping spar
US3319803A (en) * 1966-04-12 1967-05-16 Fairey Canada Ltd Retractable chain boom
US3465904A (en) * 1966-11-18 1969-09-09 Massey Ferguson Services Nv Adjustable boom for material handling equipment
US3480109A (en) * 1968-01-15 1969-11-25 Telsta Corp Lifting equipment
US3670465A (en) * 1969-04-21 1972-06-20 Ppm Sa Telescopic jibs
US3800965A (en) * 1972-01-11 1974-04-02 H Pavone Ladle skimming mechanism

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2812177A1 (de) * 1977-03-21 1978-10-05 Jonsereds Fabrikers Ab Einrichtung an einem hydraulisch betriebenen kran
US4285629A (en) * 1978-05-18 1981-08-25 Elliston Thomas L Fire fighting boom assembly for service vessel
US4390315A (en) * 1978-05-18 1983-06-28 Hydra Rig Incorporated Fire fighting boom assembly for service vessel
US4699281A (en) * 1984-03-15 1987-10-13 Kabushiki Kaisha Hikoma Seisakusho Telescopic boom mechanism
US4757968A (en) * 1986-02-10 1988-07-19 Orion-Yhtyma Oy Apparatus for implementation of vertical movement of a chair, especially of a patient chair
US6062404A (en) * 1996-12-20 2000-05-16 Grove U.S. L.L.C. Device and method for arresting sections of a telescopic jib
US6164468A (en) * 1998-06-17 2000-12-26 Grove U.S. L.L.C. Jib positioning with hydraulic adjustment cylinder
US20040040924A1 (en) * 2001-01-22 2004-03-04 Christian Reifenscheid Mobile crane comprising a telescopic jib
CN102659039A (zh) * 2012-05-11 2012-09-12 徐工集团工程机械股份有限公司 损伤力消减装置以及用于起重机的变幅装置
CN102659039B (zh) * 2012-05-11 2014-05-14 徐工集团工程机械股份有限公司 损伤力消减装置以及用于起重机的变幅装置
WO2017151021A1 (en) * 2016-02-29 2017-09-08 Saab Ab A fluid actuator arrangement comprising a lifting member

Also Published As

Publication number Publication date
DE2350398B2 (de) 1977-01-27
DE2350398A1 (de) 1974-04-18
CA986060A (en) 1976-03-23
FR2202025B1 (enrdf_load_html_response) 1978-11-10
GB1437526A (en) 1976-05-26
FR2202025A1 (enrdf_load_html_response) 1974-05-03

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NAVISTAR INTERNATIONAL CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004546/0650

Effective date: 19860220

Owner name: NAVISTAR INTERNATIONAL CORPORATION, ILLINOIS

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL HARVESTER COMPANY;REEL/FRAME:004546/0650

Effective date: 19860220

AS Assignment

Owner name: NAVISTAR INTERNATIONAL CORPORATION A CORP. OF DE,

Free format text: MERGER;ASSIGNOR:NAVISTAR INTERNATIONAL TRANSPORTATION CORP. (MERGED);REEL/FRAME:005195/0610

Effective date: 19870317