US3842983A - Articulated jib for crawler tractors and the like - Google Patents

Articulated jib for crawler tractors and the like Download PDF

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Publication number
US3842983A
US3842983A US00364691A US36469173A US3842983A US 3842983 A US3842983 A US 3842983A US 00364691 A US00364691 A US 00364691A US 36469173 A US36469173 A US 36469173A US 3842983 A US3842983 A US 3842983A
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tractor
jib
jacks
plane
transverse
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US00364691A
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English (en)
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C Dolza
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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
    • B66C23/54—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
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/44—Jib-cranes adapted for attachment to standard vehicles, e.g. agricultural tractors

Definitions

  • ABSTRACT A crawler tractor having lifting means for pipe-laying, said lifting means comprising a lifting jib articulated laterally to the tractor frame by means of a universal joint, the jib being movable under the action of a plurality of hydraulic jacks for producing the pivotal movement of the jib in a transverse vertical plane and movement in a plane parallel to the longitudinal axis of the tractor in order to displace the centre of gravity of the lifted load.
  • the present invention relates to crawler tractors provided with lifting equipment in the form of a crane jib, especially for use in laying lengths of piping for oil pipelines, water pipes or the like.
  • the tractors of the above mentioned kind consist of tracked machines provided at one side with a lifting jib equipped with sling ropes and winch members, the jib laterally overhanging the machine to enable the machine to run along the side of the basic excavation, laying lengths of pipes one after the other.
  • the tractor runs on very steep inclines; accordingly the overall centre of gravity of the machine and lifted load, for instance of a length of pipe, moves beyond the limit of the ground-contacting track of the machine, so that the tractor shows a tendency to turn over.
  • the lifting jib is made movable in a plane parallel to the direction of of the longitudinal axis of the machine in response to inclination of the machine whereby to displace the lifted load in relation to the centre of gravity of the machine so that the overall centre of gravity of both lifted load and machine are constantly kept within the length of the track of the machine.
  • the movement of the lifting jib in the relevant plane is advantageously obtained by means of a pair of symmetrical hydraulic jacks operable in such a way that they pivot the jib about an articulation point on the ma chine frame. Furthermore, the jib is provided with a third jack, capable of effecting its operational tilting in the transverse vertical plane, thus eliminating the need for turnover ropes, the presence of the latter being inconsistent with the longitudinal movement of the jib, essentially for the safety of the operator.
  • FIG. 1 is a diagrammatic front elevation of the machine, showing the lifting jib and the turnover movement thereof in the transverse vertical plane;
  • FIG. 2 is a view of the lifting jib in direction of arrows IIII of FIG. 1, showing the jib in the central position of normal deployment;
  • FIG. 3 is a view similar to FIG. 2 but showing the jib angularly displaced in a longitudinal plane in order to produce an appropriate displacement of the centre of the gravity of the lifted load along the longitudinal axis of the machine.
  • 10 generally designates the machine, which consists of a crawler tractor provided with an operators cab 11 at one side and a cantilevered lifting jib 12 at the side opposite to the operators cab.
  • the jib 12 is provided with a sling hook, operable through the intermediary of a reduction pulley 14 by means of a rope 14a cooperating with a winch (not illustrated).
  • the lower part of the jib 12 is linked on the frame of the machine by means of a double articulated joint, as designated in a general way by 15 in FIG. 3.
  • the latter is provided with a hub 16 for articulation of the jib in the transverse vertical plane, thus making the jib capable of pivotal movement in said plane, hereafter said turnover pivoting, in direction of the arrows 'F r (FIG. 1).
  • the turnover pivoting is obtained by means of a hydraulic jack 23, linked at one side on a support 24, on the machine frame, by interposition of a pivot pin 25 and, at the opposite side, on the end of the jib 12, by interposition of a pivot pin 26.
  • the position of the jack 23 does not interfere with the part of machine provided with the operators cab 11, the presence of said jack being consistent with the longitudinal follower movements of the jib, as hereafter specified in detail.
  • the support 24 is accordingly provided with a further pivot 27, orthagonal to the above said pivot pin 25.
  • the articulation of the hub 16 is effected by interposition of a sleeve 17, provided with a pivot pin 18, around which the jib 12 is articulated in such a way that it can oscillate clockand counterclockwise in the relevant longitudinal plane (drawing plane of FIGS.
  • angular amplitude will be determined in relation to the duty requirements of the machine, for instance within 25 to 30, as shown in FIG. 3, wherein the maximum amplitude of the jib is angularly clockwise displaced in direction of arrow Fb in relation to the axis A.
  • the follower movement is advantageously reached by means of symmetrical hydraulic jacks 19, 20 articulated at one end on respective arms 21, 22 which are carried by the jib.
  • the articulations of the jacks on the frame I are also of the crossed pivots kind, respectively 284, 29 one being provided for the turnover pivoting, the other for the follower movement.
  • Jacks 19, 20 are hydraulically interconnected by means of appropriate valves, so that with the expansion of one, for instance that corresponding to the jack 19 for the clockwise follower movement retraction of the other occurs. Both jacks can be singleacting or double-acting.
  • the jib 12 As seen from above, is in a position on the left side of the machine and should the machine enter an uphill gradient, the displacement of the centre of gravity of the load, consequent to the inclination of the machine,will be compensated by a corresponding clockwise training of the jib, the overall centre of gravity of the machine and the load being contained, according to the object of the invention, within the ground-contacting track of the machine.
  • jacks 19, 20 will advantageously be of the rapid expansion kind, using a pump provided with valve means as necessary to carry out an emergency fluid delivery. For normal duty a part only of the said pump delivery will suffice.
  • a crawler tractor comprising:
  • a cantilevered lifting jib directly articulated on the tractor for pivotal movement in a vertical plane which is transverse relative to the tractor;
  • pivot means having a pivot axis substantially parallel to said transverse plane to support the lifting jib for pivotal movement in a longitudinal plane which is substantially parallel to the longitudinal axis of the tractor in response to the inclination of the tractor;
  • jack means located in a common plane with the jib for moving the jib in said longitudinal plane, so as to displace the lifted load in relation to the centre of gravity of the tractor substantially parallel to the I within the ground-contacting track of the machine.
  • a tractor according to claim 3 wherein said jack means includes:
  • an additional hydraulic jack for effecting pivotal movement of the jib in the transverse vertical plane about a pivot on the tractor on the side thereof opposite to a lateral operating cab.
  • a tractor according to claim 4 including means for effecting said transverse articulation of the lifting jib for its longitudinal movement, said means including a sleeve rotatable about a pivot pin, said sleeve carrying an orthogonal pivot pin on which the jib is mounted for its pivotal movement in the transverse vertical plane.
  • a tractor according to claim 8 wherein said jib and said pair of jacks are located in the same common plane, said jacks being located on opposite sides of said said longitudinal axis so that the overall centre of jib.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Jib Cranes (AREA)
US00364691A 1972-06-09 1973-05-29 Articulated jib for crawler tractors and the like Expired - Lifetime US3842983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT68842/72A IT959098B (it) 1972-06-09 1972-06-09 Perfezionamento nelle trattrici cin golate munite di mezzi di solleva mento specialmente per la posa di tubi

Publications (1)

Publication Number Publication Date
US3842983A true US3842983A (en) 1974-10-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00364691A Expired - Lifetime US3842983A (en) 1972-06-09 1973-05-29 Articulated jib for crawler tractors and the like

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US (1) US3842983A (cg-RX-API-DMAC7.html)
JP (1) JPS4963144A (cg-RX-API-DMAC7.html)
IT (1) IT959098B (cg-RX-API-DMAC7.html)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476250A1 (fr) * 1980-02-15 1981-08-21 Poclain Sa Articulation de pivotement
US4304519A (en) * 1979-10-29 1981-12-08 Hubbard John S Towing vehicle with side lifter
US4966290A (en) * 1989-10-12 1990-10-30 Caterpillar Inc. Vehicle for manipulating pipe
US5240129A (en) * 1990-06-04 1993-08-31 Link-Belt Construction Equip. Co. Heavy duty crane with self-retracting/erecting live mast
US20060254998A1 (en) * 2003-03-11 2006-11-16 Davis Daniel E Pipelayer crane excavator apparatus and methods
US20070221600A1 (en) * 2003-03-11 2007-09-27 Davis Daniel E Pipelayer and method of loading pipelayer or excavator for transportation
USD567259S1 (en) 2007-05-09 2008-04-22 Davis Daniel E Pipelayer
CN102491195A (zh) * 2011-12-22 2012-06-13 上海三一科技有限公司 一种桁架臂起重机的加强臂架结构及包括该装置的起重机
US20120205336A1 (en) * 2010-07-21 2012-08-16 KUNSHAN SANY MECHANICAL, Co., LTD. crane jib transition structure
US20220073321A1 (en) * 2018-12-21 2022-03-10 Tadano Demag Gmbh Vehicle crane with a boom that can be luffed by two luffing cylinders

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304519A (en) * 1979-10-29 1981-12-08 Hubbard John S Towing vehicle with side lifter
FR2476250A1 (fr) * 1980-02-15 1981-08-21 Poclain Sa Articulation de pivotement
US4966290A (en) * 1989-10-12 1990-10-30 Caterpillar Inc. Vehicle for manipulating pipe
US5240129A (en) * 1990-06-04 1993-08-31 Link-Belt Construction Equip. Co. Heavy duty crane with self-retracting/erecting live mast
US20070241074A9 (en) * 2003-03-11 2007-10-18 Davis Daniel E Pipelayer crane excavator apparatus and methods
US20070221600A1 (en) * 2003-03-11 2007-09-27 Davis Daniel E Pipelayer and method of loading pipelayer or excavator for transportation
US20060254998A1 (en) * 2003-03-11 2006-11-16 Davis Daniel E Pipelayer crane excavator apparatus and methods
USD567259S1 (en) 2007-05-09 2008-04-22 Davis Daniel E Pipelayer
US20120205336A1 (en) * 2010-07-21 2012-08-16 KUNSHAN SANY MECHANICAL, Co., LTD. crane jib transition structure
US8777026B2 (en) * 2010-07-21 2014-07-15 Hunan Sany Intelligent Control Equipment Co., Ltd. Crane jib transition structure
CN102491195A (zh) * 2011-12-22 2012-06-13 上海三一科技有限公司 一种桁架臂起重机的加强臂架结构及包括该装置的起重机
US20220073321A1 (en) * 2018-12-21 2022-03-10 Tadano Demag Gmbh Vehicle crane with a boom that can be luffed by two luffing cylinders
US12065335B2 (en) * 2018-12-21 2024-08-20 Tadano Demag Gmbh Vehicle crane with a boom that can be luffed by two luffing cylinders

Also Published As

Publication number Publication date
IT959098B (it) 1973-11-10
JPS4963144A (cg-RX-API-DMAC7.html) 1974-06-19

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