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EP0928770A1 - Procédé et appareil pour déplier et replier une flèche complémentaire - Google Patents

Procédé et appareil pour déplier et replier une flèche complémentaire Download PDF

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Publication number
EP0928770A1
EP0928770A1 EP99100087A EP99100087A EP0928770A1 EP 0928770 A1 EP0928770 A1 EP 0928770A1 EP 99100087 A EP99100087 A EP 99100087A EP 99100087 A EP99100087 A EP 99100087A EP 0928770 A1 EP0928770 A1 EP 0928770A1
Authority
EP
European Patent Office
Prior art keywords
jib
boom
state
end portion
falling
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.)
Withdrawn
Application number
EP99100087A
Other languages
German (de)
English (en)
Inventor
Hiroshi Miyazawa
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of EP0928770A1 publication Critical patent/EP0928770A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • the present invention relates to a method of projecting and housing a jib and apparatus thereof for housing the jib in the side of a boom when not in use and projecting the jib into the extreme end of the boom in cranes such as a wheel crane, a truck crane and the like.
  • a method is well known in which the jib is housed in the side of an expansion boom in the state where a base end thereof (so-called a jib foot) is directed at the extreme end of the boom, and the jib is projected into the extreme end of the boom via the steps mentioned below, and is housed in the procedure reversed to the former.
  • the jib is housed in the side of the boom with the intermediate portion and the extreme end portion thereof secured to the side of the boom in the state where the base end thereof is away sideways with respect to the extreme end portion of the boom so as not to disturb the expansion operation of the boom.
  • the jib is risen forward of the boom, completing the projection of the jib.
  • the turning center shaft in the step of turning a jib described above (3) is set perpendicularly to the boom shaft, the turning center shaft is vertical in the horizontal state of the boom, but it is in the state of being inclined so as to be fallen on its back in the state where the boom is risen in turning the jib.
  • the jib when the jib is turned, the jib is moved up and down, thus posing a problem that a great operating force is required so that a burden of labor on an operator increases.
  • the jib is operated to be swung round the swinging center shaft provided in an intermediary securing mechanism in the step of turning a jib as described above.
  • intermediary securing brackets are provided, as the jib intermediary securing mechanism, on the jib side and on the boom side, and intermediary securing pins are inserted into holes of both the intermediary brackets parallel with the boom axis (horizontal in the longitudinal direction), the pin receiving portion being a turning support.
  • the jib turning center shaft is inclined with respect to the shaft perpendicular to the boom axis (inclined frontward as viewed from the side in the horizontal state of the boom) and is vertical as viewed from front and back surfaces, distances of movement caused by the swinging of upper and lower holes (hereinafter referred to as turning center holes) on the jib side arranged in the turning center line are different, and in the jib swinging state, the tuning center hole on the boom side does not coincide with that on the jib side and therefore the turning center shaft cannot be inserted.
  • turning center holes upper and lower holes
  • the turning center shaft is inclined as viewed from the side with respect to the axis perpendicular to the cylinder axis and also inclined as viewed from the front and back surfaces, it is possible to coincide the upper and lower turning center holes, but the turning center shaft cannot be made to be vertical, as a result of which in turning, the vertical movement of the jib occurs, thus failing to achieve the intended object of eliminating the vertical movement.
  • the present invention assumes the constitution that a jib tuning center shaft is inclined with respect to a shaft perpendicular to a boom axis so as to be substantially vertical in a jib falling state, and provides a method of projecting and housing a jib of a crane capable of coinciding upper and lower turning center holes on the jib side and on the boom side into which are inserted turning center shafts on a turning center line in the step of swinging a jib.
  • the jib comprises a jib body, and a jib bracket connected rotatably around a jib falling center shaft in the step of falling a jib to the base end portion of the jib body, the jib bracket being provided with a boom connecting portion connected to the extreme end portion of the boom by a jib turning center shaft in the step of turning a jib.
  • a fourth invention there is provided the constitution according to the second or third invention, wherein engaging means for obstructing rotation round the jib tuning center shaft in the step of falling a jib are provided on the jib and the side of the boom in which the jib is housed.
  • the swinging center shaft in the jib swinging step is set substantially parallel with the jib turning center shaft, the moving distances of the upper and lower turning center holes on the jib side caused by the swinging of the jib are equal to each other while employing the constitution in which the tuning center shaft is inclined with respect to the axis perpendicular to the boom axis, whereby the turning center hole on the jib side can be coincided with the turning center hole on the boom side.
  • the jib is rotated (inclined or fallen) sideways of the boom round the turning center shaft.
  • reference numeral 1 designates a boom
  • reference numeral 2 designates a jib.
  • reference numeral 3 designates a rotating frame of an upper rotating body of a crane in which the boom 1 is mounted for rising and falling round a boom foot pin 4.
  • the boom 1 is constituted expansibly by a basic boom 1a, one or more intermediate booms 1b, and an extreme end boom 1c.
  • the jib 2 is housed in the left side (the left side as viewed from the rotating frame 3 side, the same is true for the lateral direction mentioned hereinbelow) of the boom 1 (basic boom 1c) as shown in FIGS. 1 and 2 when not in use, and projected into the extreme end of the boom 1 (the extreme end boom 1c) when in use.
  • the boom 1 is provided at a position dose to the extreme end of the intermediate portion on the left side of the basic boom 1a with an intermediary securing bracket 5, and at the base end portion with an extreme end securing bracket 6.
  • the intermediary securing bracket 5 is mounted rotatable round a jib swinging center shaft 7 with respect to the basic boom 1a, and the jib 2 is fitted in the intermediary securing bracket 5 from the underside in the horizontal state of the boom and secured by a laterally horizontal intermediary securing pin 8.
  • the extreme end securing bracket 6 has on its upper side an upper projection 6a projecting lengthwise sideways of the boom and on its lower side a short lower projection 6b as shown in FIG. 8, and in the state where the jib 2 is positioned between both the projections 6a and 6b, and an extreme end securing pin 10 is inserted over both the projections 6a and 6b and a bracket 9 on the jib side provided on the jib 2 whereby the extreme end portion of the jib is secured to the boom side.
  • the jib mounting bracken 11, 11 and 12, 12 on both sides are provided with jib mounting holes 11a, 11a and 12a, 12a, respectively.
  • the jib 2 is constituted by a jib body 13 and a jib bracket 15 connected rotatable round a lateral horizontal shaft 14 combining a jib falling center shaft and a jib rising center shaft.
  • the jib bracket 15 is provided, in the housed state, with left jib feet 16, 16 as boom connecting portions vertically on the left side, and right jib feet 17, 17 vertically on the right side, respectively.
  • the jib feet 16, 16 and 17, 17 on both sides are provided with jib foot holes 16a, 16a and 17a, 17a coincident with the jib mounting holes 11a, 11a and 12a, 12a of the jib mounting brackets 11, 11, and 12, 12 on the boom side when the jib is projected.
  • a guide rail 18 in the form of a circular arc from the upper end to the lower end is provided on the left side of the extreme end of the basic boom 1a, and a guide roller 19 (see FIGS. 4 and 5) capable of being rolled along the guide rail 18 is provided at a position close to the intermediate base end portion of the jib 2.
  • a jib rising and falling cylinder 20 (hydraulic cylinder) combining a jib projecting cylinder is provided between the intermediate portion of the jib 2 and the jib bracket 15.
  • the jib 2 in its housed state, is at a position away leftward with respect to the left jib mounting brackets 11 and 11 of the right jib brackets 17 and 17, as shown in FIGS. 2 and 4.
  • the guide roller 19 on the jib side is also at a position deviated leftward with respect to the guide rail 18 on the boom side.
  • the jib rising and falling cylinder 20 is in an extended state as shown in FIG. 1.
  • the jib 2 is projected from this state via the following steps.
  • the jib 2 is swung in the direction of arrow (a) of FIG. 4 round the jib swinging center shaft 7 till the right jib feet 17, 17 of the jib 2 are superposed to the left jib mounting brackets 11, 11 of the boom 1 and the jib foot holes 17a, 17a and the jib mounding holes 11a, 11a are vertically coincided with each other.
  • the jib turning center shaft 21 (which can be substituted by the extreme end securing pin 10) is inserted over the jib foot holes 17a, 17a and the jib mounting holes 11a, 11a.
  • the boom 1 is risen by a boom rising and falling cylinder not shown, and the jib rising and falling cylinder 20 is contracted whereby the jib body 13 is fallen round the horizontal shaft 14 as indicated by the solid line of FIG. 6 and the dash-dotted contour lines of FIG. 7.
  • the angle of the boom at that time is an angle at which the lower end of the jib is somewhat away from the ground surface.
  • the guide roller 19 on the jib side faces the guide rail 18 from the top by the swinging operation of the jib, is engaged with the guide rail 18 at the outset when the jib falls, and after this, rolls along the guide rail 18 together with falling of the jib.
  • the jib body 13 is prevented, during the falling of the jib, from being rotated, inclined or fallen sideways of the boom round the jib turning shaft 21.
  • the jib 2 is turned substantially 180° in the direction of arrow (b) of FIG. 5 round the jib turning center shaft 21, as indicated by the solid line of FIG. 7 and the dash-dotted contour lines of FIG. 5, the left jib foot 16 is superposed to the right jib mounting bracket 12 of the boom 1, and the right jib mounting pin (not shown) is inserted over the jib foot holes 16a and 16a and the jib mounting holes 12a and 12a.
  • the right jib mounting pin may be inserted by remote operation of the hydraulic cylinder not shown, or may be inserted manually in the state where the boom 1 and the jib 2 are fallen after the rising operation of the jib accomplished thereafter.
  • the base end portion of the jib 2 is connected to the extreme and of the boom, and after this, the jib rising and falling cylinder 20 is extended whereby the jib 2 is risen to project the boom forward as indicated by the phantom line of FIG. 7.
  • the housing of the jib 2 is carried out in the procedure reversed to the former.
  • the jib swinging center shaft 7 round the jib swinging in the step of swinging a jib in the above (i) and the jib turning center shaft 21 round the jib turning in the step of turning a jib in the above (iii) are set to be inclined with respect to the axis X (shown in FIG. 6) perpendicular to the boom axis and parallel with each other so that they are substantially vertical (completely vertical or the state very dose thereto) in the jib falling state indicated by the dash-dotted contour lines in FIG. 7.
  • the moving distances of the upper and lower jib foot holes on the right side of the jib 2 (turning center boles on the jib side) caused by the jib swinging in the direction of the arrow of FIG. 4 are equal, so that the turning center holes 17a and 17a can be coincided with the turning center holes (left jib foot holes) 11a and 11a on the boom side while employing the constitution in which the turning center shaft 21 is inclined with respect to the axis X perpendicular to the boom axis.
  • the extreme end securing pin 10 is also arranged substantially parallel with the jib swinging shaft 7 as shown in FIG. 1.
  • the horizontal shaft 14 which is the jib rising and falling center is positioned above the boom axis A in the boom fallen state as shown in FIG. 1, and (II) in the jib projected state, the horizontal shaft 14 is positioned under the boom axis A (in this embodiment, as a more preferable embodiment, the vertical position substantially the same as the lower surface of the boom which is considerably lower than the boom axis A) as indicated by the phantom line of FIG. 7.
  • the relevant specifications such as an angle of inclination of the connecting shaft 21, a jib connecting point with respect to the jib bracket 15 and the like are set so as to obtain the jib projecting and housing state as described.
  • the entire jib 2 is housed substantially parallel with the boom axis, the entire jib is positioned above the axis A in the housed state, and the jib rising and falling cylinder 19 is also in the state not projecting downward from the boom side (even if the cylinder 19 should project the amount of which is very small depending on the manner of design).
  • the horizontal shaft 14 is positioned downward, the operating radius of the jib during the operation of the jib can be taken large, which is advantageous particularly at the operation which is necessary to take the operating radius almost merely by the jib 2.
  • the swinging center shaft in the step of swinging a jib and the jib turning center shaft in the state of turning a jib are set to be inclined with respect to the axis perpendicular to the boom axis and substantially parallel with each other so as to be substantially vertical in the state of a boom angle in the step of falling a jib, the moving distances of the upper and lower turning center holes on the jib side caused by the jib swinging are equal so that the turning hole on the jib side can be coincided with the turning hole on the boom side.
  • a jib swinging center shaft 7 which comprises a swinging center in the step of swinging a jib 2 and a jib turning center shaft 21 which comprises a jib turning center in the step of turning after the jib has been fallen are set to be inclined with respect to an axis perpendicular to the boom axis and parallel with each other so that they are substantially vertical in the boom angle state in the step of falling a jib.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP99100087A 1998-01-09 1999-01-05 Procédé et appareil pour déplier et replier une flèche complémentaire Withdrawn EP0928770A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP334098 1998-01-09
JP334098A JPH11199177A (ja) 1998-01-09 1998-01-09 クレーンのジブ張出し、格納方法および同装置

Publications (1)

Publication Number Publication Date
EP0928770A1 true EP0928770A1 (fr) 1999-07-14

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Family Applications (1)

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EP99100087A Withdrawn EP0928770A1 (fr) 1998-01-09 1999-01-05 Procédé et appareil pour déplier et replier une flèche complémentaire

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EP (1) EP0928770A1 (fr)
JP (1) JPH11199177A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1955974A1 (fr) * 2007-02-08 2008-08-13 Manitowoc Crane Companies, Inc. Rallonge de flèche déployable automatiquement et son procédé de déploiement
CN102701087A (zh) * 2012-06-12 2012-10-03 北京市三一重机有限公司 一种臂架及工程机械
CN109279549A (zh) * 2017-07-20 2019-01-29 成都凯天电子股份有限公司 高空作业平台折叠运输转位连接机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254510A1 (fr) * 1986-07-21 1988-01-27 Tadano Ltd. Fléchette pour une flèche
EP0728695A1 (fr) * 1993-11-08 1996-08-28 Komatsu Ltd. Dispositif d'extension et de stockage d'une fleche horizontale
EP0747315A1 (fr) * 1994-02-25 1996-12-11 Komatsu Ltd. Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique
JPH0967087A (ja) * 1995-08-30 1997-03-11 Komatsu Ltd 移動式クレーンのジブ張出、格納装置及びその方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254510A1 (fr) * 1986-07-21 1988-01-27 Tadano Ltd. Fléchette pour une flèche
EP0728695A1 (fr) * 1993-11-08 1996-08-28 Komatsu Ltd. Dispositif d'extension et de stockage d'une fleche horizontale
EP0747315A1 (fr) * 1994-02-25 1996-12-11 Komatsu Ltd. Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique
JPH0967087A (ja) * 1995-08-30 1997-03-11 Komatsu Ltd 移動式クレーンのジブ張出、格納装置及びその方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 097, no. 007 31 July 1997 (1997-07-31) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1955974A1 (fr) * 2007-02-08 2008-08-13 Manitowoc Crane Companies, Inc. Rallonge de flèche déployable automatiquement et son procédé de déploiement
CN102701087A (zh) * 2012-06-12 2012-10-03 北京市三一重机有限公司 一种臂架及工程机械
CN109279549A (zh) * 2017-07-20 2019-01-29 成都凯天电子股份有限公司 高空作业平台折叠运输转位连接机构
CN109279549B (zh) * 2017-07-20 2023-10-24 成都凯天电子股份有限公司 高空作业平台折叠运输转位连接机构

Also Published As

Publication number Publication date
JPH11199177A (ja) 1999-07-27

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