JPH0582981U - Crane with multi-stage jib - Google Patents
Crane with multi-stage jibInfo
- Publication number
- JPH0582981U JPH0582981U JP2279892U JP2279892U JPH0582981U JP H0582981 U JPH0582981 U JP H0582981U JP 2279892 U JP2279892 U JP 2279892U JP 2279892 U JP2279892 U JP 2279892U JP H0582981 U JPH0582981 U JP H0582981U
- Authority
- JP
- Japan
- Prior art keywords
- jib
- stage
- boom
- main hook
- tip
- 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.)
- Granted
Links
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Abstract
(57)【要約】
【目的】 多段ジブ付きクレーンにおいて、多段ジブ３
の伸縮ストロークを大きくとることができるようにした
ものであっても、多段ジブと主フック５とが接触しない
ようにして該多段ジブ又は主フックを保護でき、さらに
内側ジブ４１の外側ジブ３１に対する伸長・固定作業を
簡単に且つ安全に行えるようにする。
【構成】 多段ジブ３の最縮小状態において内側ジブ４
１の基端部４２が外側ジブ３１の主フック経過空間３５
内に位置するようにし、内側ジブ４１の先端部寄り適所
と基端ブーム１１の間に、多段ジブ３の下抱き格納状態
において、内側ジブ４１が基端ブーム１１に対してブー
ム左右方向に揺動するのを許容する状態で連結する連結
手段８を設け、外側ジブ３１と内側ジブ４１間に、内側
ジブ４１の基端部４２が主フック経過空間３５内に位置
しない中間伸長位置で内側ジブ４１を外側ジブ３１に固
定する固定手段９を設けた。
(57) [Summary] [Purpose] For multi-stage jib cranes, multi-stage jib 3
Even if it is possible to take a large expansion / contraction stroke, it is possible to protect the multi-stage jib or the main hook by preventing the multi-stage jib and the main hook 5 from contacting each other, and further to protect the inner jib 41 from the outer jib 31. Make extension and fixing work easy and safe. [Structure] The inner jib 4 in the most reduced state of the multi-stage jib 3
The base end portion 42 of 1 is the main hook passage space 35 of the outer jib 31.
The inner jib 41 swings in the left-right direction of the boom with respect to the base boom 11 in a state of hugging and storing the multi-stage jib 3 between a proper position near the tip of the inner jib 41 and the base boom 11. A connecting means 8 for connecting in a state permitting movement is provided, and the inner jib is located between the outer jib 31 and the inner jib 41 at an intermediate extension position where the base end portion 42 of the inner jib 41 is not located in the main hook passage space 35. A fixing means 9 for fixing 41 to the outer jib 31 is provided.
Description
【０００１】[0001]
本考案は、伸縮ブームの先端部に、外側ジブ内に内側ジブを伸縮自在に嵌挿し てなる多段ジブを、伸縮ブーム下面側の下抱き格納位置とブーム前方の前方張り 出し位置との間で上下方向に回動せしめ得るようにした多段ジブ付きクレーンに 関するものである。 The present invention provides a multi-stage jib at the tip of the telescopic boom, in which the inner jib is telescopically inserted into the outer jib, between the lower hugging storage position on the lower surface of the telescopic boom and the forward projecting position in front of the boom. The present invention relates to a crane with a multi-stage jib that can be rotated in the vertical direction.
【０００２】[0002]
図５及び図６には、従来の多段ジブ付きクレーンが示されている。この従来の 多段ジブ付きクレーンでは、伸縮ブーム１の先端部（先端ブーム２１の先端部） ２３に、多段ジブ３を伸縮ブーム下面側の下抱き格納位置とブーム前方の前方張 り出し位置との間で上下方向に回動し得る如く装着している。多段ジブ３は、外 側ジブ３１内に内側ジブ４１を伸縮自在に嵌挿して構成されている。内側ジブ４ １は、外側ジブ３１に対して最縮小位置と最伸長位置とでそれぞれピン固定され る。即ち、外側ジブ３１の先端部に設けたピン穴３８と内側ジブ４１の先端部寄 りに設けたピン穴４８とをピン３０で連結したときに、多段ジブ３が最縮小状態 となり、又該外側ジブ３１のピン穴３８と内側ジブ４１の基端部寄りに設けたピ ン穴４６とをピン３０で連結したときに、多段ジブ３が最伸長状態となり、その 最縮小状態から最伸長状態までの伸縮ストロークは符号Ｎの範囲となる。又、外 側ジブ３１の基端部３２には、左右２つの脚部３４，３４が設けられており、該 各脚部３４，３４の基端部をそれぞれ先端ブーム先端部２３の左右両側部にある 軸２４，２４に着脱自在に連結し得るようになっている。尚、この多段ジブ付き クレーンでは、基端ブーム１１の基端部寄り下面に起伏シリンダ２の一端が連結 されている関係上、多段ジブ３の下抱き格納状態においては図６に示すように多 段ジブ３の先端側がブーム左右方向の一側に変位した姿勢で格納される。又、こ の多段ジブ３は、不使用時には外側ジブ３１が基端ブーム１１に対して前後２箇 所（符号１７と１８部分）で固定されるとともに、該外側ジブ３１の基端部３２ が軸２４，２４から分離される。 5 and 6 show a conventional multi-stage jib-mounted crane. In this conventional crane with a multi-stage jib, the multi-stage jib 3 is attached to the tip end portion (the tip end portion of the tip boom 21) 23 of the telescopic boom 1 between the lower hugging storage position of the telescopic boom lower side and the forward projecting position in front of the boom. It is mounted so that it can rotate vertically between them. The multi-stage jib 3 is configured by inserting an inner jib 41 into the outer jib 31 so as to extend and contract. The inner jib 41 is pin-fixed to the outer jib 31 at the most contracted position and the most expanded position, respectively. That is, when the pin hole 38 provided at the tip of the outer jib 31 and the pin hole 48 provided near the tip of the inner jib 41 are connected by the pin 30, the multi-stage jib 3 is in the most contracted state, and When the pin hole 38 of the outer jib 31 and the pin hole 46 provided near the base end of the inner jib 41 are connected by the pin 30, the multi-stage jib 3 is in the most extended state, and from the most contracted state to the most extended state. The expansion and contraction strokes up to are within the range of the symbol N. The base end portion 32 of the outer jib 31 is provided with two left and right leg portions 34, 34, and the base end portions of the respective leg portions 34, 34 are respectively left and right side portions of the tip boom tip portion 23. It can be detachably connected to the shafts 24, 24. In this multi-stage jib-equipped crane, one end of the hoisting cylinder 2 is connected to the lower surface of the base end boom 11 near the base end portion, so that when the multi-stage jib 3 is stored under the hug, as shown in FIG. The tip end side of the step jib 3 is stored in a posture in which it is displaced to one side in the left-right direction of the boom. Further, in the multi-stage jib 3, when the outer jib 31 is not used, the outer jib 31 is fixed to the base end boom 11 at two front and rear positions (reference numerals 17 and 18), and the base end 32 of the outer jib 31 is fixed. Separated from the shafts 24, 24.
【０００３】 他方、先端ブーム２１の先端部２３には、主フック５が吊下げられている。又 、多段ジブ３の外側ジブ３１の基端部３２側には、内側ジブ４１が最縮小した状 態において、最巻上げされた主フック５を経過せしめ得る主フック経過空間３５ が形成されている。即ち、この主フック経過空間３５は、図５及び図６に示すよ うに、左右の脚部３４，３４を枢支している軸２４の位置から最縮小状態にある 内側ジブ４１の基端部４２までの長さＬを該軸２４の位置から最巻上げ状態にあ る主フック５の下端までの長さＭよりやや長くして形成しており、多段ジブ３が 符号３′で示すように伸縮ブーム１の下面側を上下方向に回動するときに、主フ ック５が該主フック経過空間３５内を経過し得るようにしている。On the other hand, a main hook 5 is suspended from the tip portion 23 of the tip boom 21. Further, on the side of the proximal end portion 32 of the outer jib 31 of the multi-stage jib 3, a main hook passage space 35 that allows the rewound main hook 5 to pass is formed in a state where the inner jib 41 is in the most contracted state. .. That is, as shown in FIGS. 5 and 6, the main hook passage space 35 is in the most contracted state from the position of the shaft 24 that pivotally supports the left and right legs 34, 34. The length L up to 42 is formed to be slightly longer than the length M from the position of the shaft 24 to the lower end of the main hook 5 in the most wound state, and the multi-stage jib 3 is indicated by reference numeral 3 '. When the lower surface side of the telescopic boom 1 is rotated in the vertical direction, the main hook 5 can pass through the main hook progress space 35.
【０００４】 又、公知のこの種の多段ジブ付きクレーンの中には、図７及び図８（実公平３ ー５２７９４号公報）に示すようなものが知られている。この図７及び図８に示 す公知の多段ジブ付きクレーンでは、内側ジブ４１の最縮小状態において、該内 側ジブ４１の基端部４２が多段ジブ３の基端部側に設けられる主フック経過空間 ３５内に位置している。そして、多段ジブ３を下抱き格納位置から前方張り出し 位置まで回動させる際には、多段ジブ３を下抱き格納位置から図７に示すように 鉛直姿勢に吊下げた状態で、内側ジブ４１をワイヤー６２によって支持しながら 図８に示す中間伸長状態まで伸長させた後、外側ジブ３１先端部のピン穴３８と 内側ジブ４１の中間部に位置するピン穴４７とにピン３０を差し込んで両者（外 側ジブと内側ジブ）を固定し（この状態では外側ジブ３１の基端部側に主フック 経過空間３５が確保される）、この状態で該多段ジブ３を前方に回動させること によって行われる。Further, among known cranes with multi-stage jib of this kind, there are known cranes shown in FIGS. 7 and 8 (Japanese Utility Model Publication No. 3-52794). In the publicly known multi-stage jib-equipped crane shown in FIGS. 7 and 8, when the inner jib 41 is in the most reduced state, the base end 42 of the inner jib 41 is a main hook provided on the base end side of the multi-stage jib 3. It is located in the transit space 35. When the multi-stage jib 3 is rotated from the lower hugging storage position to the forward extension position, the inner jib 41 is hung while the multi-stage jib 3 is suspended from the lower hugging storage position in the vertical posture as shown in FIG. After being extended to the intermediate extension state shown in FIG. 8 while being supported by the wire 62, the pin 30 is inserted into the pin hole 38 at the tip portion of the outer jib 31 and the pin hole 47 located at the middle portion of the inner jib 41, and both ( The outer jib and the inner jib are fixed (in this state, the main hook passage space 35 is secured at the base end side of the outer jib 31), and in this state, the multi-stage jib 3 is rotated forward. Be seen.
【０００５】[0005]
ところが、図５及び図６に示す従来の多段ジブ付きクレーンでは、多段ジブ３ の基端部側に主フック経過空間３５を形成するにあたり、内側ジブ４１の最縮小 状態においても内側ジブ４１の基端部４２が該主フック経過空間３５内に位置し ないように該内側ジブ４１の長さを短くしているので、内側ジブ４１の外側ジブ ３１に対する伸縮ストロークＮが短くなり、クレーン作業範囲が小さくなるとい う問題があった。 However, in the conventional multi-stage jib-equipped crane shown in FIGS. 5 and 6, when the main hook passage space 35 is formed on the base end side of the multi-stage jib 3, the base of the inner jib 41 is reduced even when the inner jib 41 is in the most contracted state. Since the length of the inner jib 41 is shortened so that the end portion 42 is not located in the main hook passage space 35, the expansion / contraction stroke N of the inner jib 41 with respect to the outer jib 31 is shortened, and the crane working range is reduced. There was a problem of becoming smaller.
【０００６】 又、図７及び図８に示す公知の多段ジブ付きクレーンでは、内側ジブ４１の伸 縮ストロークは長くできるものの、外側ジブ３１の基端部に主フック経過空間３ ５を形成するに際して、最縮小状態にある多段ジブ３を下抱き格納位置から鉛直 姿勢まで回動させ、その状態で内側ジブ４１を伸長させることによって行うよう になっているので、内側ジブ４１の基端部４２が主フック５と摺接して該内側ジ ブ基端部４２又は主フック５が傷つくという問題があり、又多段ジブ３を吊下げ 状態から内側ジブ４１をウインチ６によるワイヤー６２の巻上げ・巻下げ操作に よって伸縮させて、外側ジブ３１側のピン穴３８に内側ジブ４１の中間部のピン 穴４７を位置合わせさせなければならず、その位置合わせ作業が面倒で且つその 作業に危険性が伴うという問題があり、さらにその穴合わせ位置が内側ジブ４１ が伸長している分だけ高位置となってピン差し込み作業に、はしご等を使用して 行う必要があるという問題があった。Further, in the well-known crane with multi-stage jib shown in FIGS. 7 and 8, although the expansion stroke of the inner jib 41 can be lengthened, the main hook passage space 35 is formed at the base end portion of the outer jib 31. Since the multistage jib 3 in the most contracted state is rotated from the lower hugging storage position to the vertical posture and the inner jib 41 is extended in that state, the base end portion 42 of the inner jib 41 is There is a problem that the inner jib base end part 42 or the main hook 5 is damaged by sliding contact with the main hook 5, and the inner jib 41 is wound / wound by the winch 6 while the multi-stage jib 3 is suspended. Therefore, the pin hole 47 in the middle part of the inner jib 41 has to be aligned with the pin hole 38 on the outer jib 31 side, which is troublesome and laborious. There is a problem in that the work is dangerous, and the hole alignment position is higher by the amount of extension of the inner jib 41, and it is necessary to use a ladder or the like to insert the pin. there were.
【０００７】 本考案は、上記した諸問題に鑑み、多段ジブ付きクレーンにおいて、多段ジブ の伸縮ストロークを大きくとることができ、しかもそのように多段ジブの伸縮ス トロークを大きくとることができるようにしたものであっても、多段ジブと主フ ックとが接触しないようにして該多段ジブ又は主フックを保護でき、さらに内側 ジブの外側ジブに対する伸長・固定作業を簡単に行えるようにすることを目的と するものである。In view of the above problems, the present invention enables a multi-stage jib crane to have a large expansion / contraction stroke of the multi-stage jib, and also has a large expansion / contraction stroke of the multi-stage jib. Even if it has been installed, it is possible to protect the multi-stage jib or the main hook by preventing the multi-stage jib and the main hook from contacting each other, and to make it easy to extend and fix the inner jib to the outer jib. The purpose is.
【０００８】[0008]
本考案は、２本以上のブームを伸縮自在に嵌挿してなる伸縮ブームと、該伸縮 ブームの先端ブームの先端部から巻上げ・巻下げ自在に吊下げた主フックと、外 側ジブ内に内側ジブを伸縮自在に嵌挿してなる多段ジブとを備え、さらに前記外 側ジブの基端部側に、前記主フックを経過せしめ得る主フック経過空間を設けた 状態で左右２つの脚部を設け、該各脚部の基端部をそれぞれ前記先端ブーム先端 部の左右両側部に枢着して、前記多段ジブが前記伸縮ブームの下面側に格納され る下抱き格納位置と先端ブーム先端部の前方に突出する前方張り出し位置との間 で上下方向に回動し得る如くし、しかも前記多段ジブが下抱き格納位置にあると きに、該多段ジブが伸縮ブームに対して平面視において非平行状態となる如くし た多段ジブ付きクレーンにおいて、前記多段ジブは、該多段ジブの最縮小状態に おいて前記内側ジブの基端部が前記外側ジブの前記主フック経過空間内に位置す るように構成するとともに、前記内側ジブの先端部寄り適所と前記基端ブームの 間に、前記多段ジブの下抱き格納状態において、連結・分離自在で且つ該内側ジ ブがブーム伸長方向に移動するのを禁止ししかも該内側ジブが基端ブームに対し てブーム左右方向に揺動するのを許容する状態で連結する連結手段を設け、さら に前記外側ジブと前記内側ジブ間に、該内側ジブの基端部が前記主フック経過空 間内に位置しない中間伸長位置で前記内側ジブを前記外側ジブに固定する固定手 段を設けたことを特徴としている。 The present invention is a telescopic boom in which two or more booms are telescopically inserted, a main hook that can be hoisted and lowered from the tip of the boom of the telescopic boom, and an inner side inside the outer jib. A multi-stage jib in which a jib is telescopically inserted is provided, and two left and right legs are provided on the proximal end side of the outer jib with a main hook passage space in which the main hook can pass. , The base end of each leg is pivotally attached to both left and right sides of the tip boom tip, and the multi-stage jib is stored on the lower surface side of the telescopic boom. The multistage jib is not parallel to the telescopic boom when viewed in plan when the multistage jib is in the lower hugging storage position so that it can rotate in the vertical direction with respect to the forward projecting position that projects forward. With multi-stage jib that is set to the state In the lane, the multi-stage jib is configured such that the proximal end portion of the inner jib is located in the main hook passage space of the outer jib when the multi-stage jib is in the most contracted state, and Between the proper position near the tip and the base boom, the inner jib is forbidden to move in the boom extension direction and is connectable / separable in the state of hugging and storing the multi-stage jib. A connecting means for connecting the end boom to the boom in the left-right direction is provided, and further, the base end of the inner jib is located between the outer jib and the inner jib and the main hook passes through the empty space. It is characterized in that a fixing means for fixing the inner jib to the outer jib is provided at an intermediate extended position which is not located in the space.
【０００９】[0009]
本考案の多段ジブ付きクレーンでは、多段ジブの最縮小状態において内側ジブ の基端部が外側ジブ側の主フック経過空間内に位置するようにしているので、多 段ジブの伸縮ストロークを大きくとれる。 In the crane with a multi-stage jib of the present invention, since the base end of the inner jib is located in the main hook passage space on the outer jib side when the multi-stage jib is in the most contracted state, the extension stroke of the multi-stage jib can be increased. ..
【００１０】 又、多段ジブを下抱き格納状態から前方に張り出す際には、外側ジブの基端部 （各脚部の基端部）を先端ブーム先端部に枢着し、且つ内側ジブの先端部寄り適 所と基端ブームとを連結手段で連結し、しかも内側ジブを伸縮自在とした状態で 、伸縮ブームを伸長させることによって多段ジブを中間伸長状態まで伸長させて 、固定手段により内側ジブと外側ジブとを中間伸長位置で固定する。尚、固定手 段による外側ジブと内側ジブとの固定作業は、伸縮ブームをほぼ水平姿勢まで倒 した状態で行え、このように伸縮ブームを水平姿勢まで倒した状態で行うと、上 記固定手段の操作位置が低くなって該固定手段を操作するのに、はしご等が不要 となる。又、このとき（伸縮ブームの伸長時）、多段ジブは伸縮ブームの下面側 において該伸縮ブームとは非平行状態にあるため、伸縮ブームが伸長することに よって該伸縮ブームと多段ジブとのなす角度が変化するようになるが、内側ジブ の先端部寄り適所と基端ブームとを連結している連結手段は、内側ジブが基端ブ ームに対してブーム左右方向に揺動し得るように構成しているので、伸縮ブーム および多段ジブを支障なく伸長させることができる。又、多段ジブが中間伸長位 置まで伸長した状態では、外側ジブの基端部側に主フックを経過せしめ得る主フ ック経過空間が形成されている。このように、多段ジブを伸縮ブームの下面側に おいて２点支持した状態（揺動しない状態）で、該多段ジブを伸長させるように すると、主フック経過空間の形成作業が安全に行えるとともに固定手段による外 側ジブと内側ジブとの固定作業がし易くなる。そして、次にウインチから繰り出 されたワイヤーによって多段ジブを支持した後、上記連結手段の連結を解除し、 伸縮ブームを適宜角度だけ立ち起こした状態で該ワイヤーを緩めることにより、 多段ジブを鉛直姿勢まで下方に回動させることができ、続いてワイヤーを多段ジ ブ側につけかえてウインチにより鉛直姿勢にある多段ジブを前方に回動させれば よい。尚、多段ジブを前方張り出し位置から下抱き格納位置に格納するには、上 記とは逆順序で行えばよい。Further, when the multi-stage jib is extended from the hugging and retracted state to the front, the base end portion (base end portion of each leg) of the outer jib is pivotally attached to the tip end boom portion, and the inner jib is fixed. The multi-stage jib is extended to the intermediate extension state by extending the telescopic boom while connecting the proper position near the tip end and the base end boom with the connecting means, and with the inner jib retractable. Secure the jib and outer jib in an intermediate extended position. Note that the work of fixing the outer jib and the inner jib by the fixing means can be performed with the telescopic boom tilted to a substantially horizontal posture. Since the operating position of is lowered, a ladder or the like is not required to operate the fixing means. At this time (when the telescopic boom is extended), since the multi-stage jib is not parallel to the telescopic boom on the lower surface side of the telescopic boom, the telescopic boom extends to form the multi-directional jib. Although the angle will change, the connecting means that connects the proper position near the tip of the inner jib and the proximal boom allows the inner jib to swing in the left-right direction of the boom with respect to the proximal boom. Since it is configured as, it is possible to extend the telescopic boom and the multi-stage jib without hindrance. Further, when the multi-stage jib is extended to the intermediate extension position, a main hook passage space for allowing the main hook to pass is formed on the proximal end side of the outer jib. In this way, if the multi-stage jib is extended while the multi-stage jib is supported at two points on the lower surface side of the telescopic boom (the state where it does not swing), the work for forming the main hook passage space can be performed safely. It becomes easy to fix the outer jib and the inner jib by the fixing means. Then, after supporting the multi-stage jib with the wire extended from the winch, the connection of the connecting means is released, and the wire is loosened while the telescopic boom is raised up to an appropriate angle, so that the multi-stage jib is vertically moved. It can be rotated downward to the posture, and then the wire can be changed to the multi-stage jib side and the multi-stage jib in the vertical posture can be rotated forward by the winch. In order to store the multi-stage jib from the front overhanging position to the lower hugging storage position, the order may be reversed.
【００１１】[0011]
本考案の多段ジブ付きクレーンによれば、多段ジブの最縮小状態において内側 ジブの基端部が外側ジブの主フック経過空間内に位置するようにしているので、 内側ジブの伸縮ストロークを大きくできて、それだけクレーン作業範囲を大きく できる。又、最縮小状態にある多段ジブから、外側ジブの基端部側に主フック経 過空間を形成する場合に、外側ジブの基端部を先端ブーム先端部に連結し且つ内 側ジブの先端部を基端ブームに連結した状態（即ち、２点支持した状態）で、伸 縮ブームを伸長させることによって行えるようにしているので、その主フック経 過空間の形成作業が安全に行える。しかもその際、伸縮ブームをほぼ水平姿勢に した状態（即ち、低位置）で固定手段を操作し得るので、その作業に、はしご等 が不要となり、さらに多段ジブが揺動しない状態で固定手段を操作し得るので該 固定手段の取り扱いが容易となる。又、多段ジブの下抱き格納状態において、内 側ジブの先端部寄り適所と基端ブームとを、内側ジブが基端ブームに対してブー ム左右方向に揺動し得る状態で連結しているので、多段ジブが伸縮ブームに対し て非平行状態で格納されるようにしたものであっても、多段ジブを伸縮ブームの 下面側に格納した状態で上記主フック経過空間の形成操作を支障なく行えるとい う効果がある。 According to the multi-stage jib-equipped crane of the present invention, since the base end portion of the inner jib is located within the main hook passage space of the outer jib when the multi-stage jib is in the most contracted state, the extension stroke of the inner jib can be increased. Therefore, the crane work range can be increased accordingly. Also, when forming a main hook passage space on the base end side of the outer jib from the multi-stage jib in the minimum contraction state, connect the base end of the outer jib to the tip boom tip and connect the tip of the inner jib. Since the extension boom is extended while the part is connected to the base boom (that is, the two-point support is provided), the work for forming the main hook passage space can be performed safely. Moreover, at that time, since the fixing means can be operated with the telescopic boom in a substantially horizontal position (that is, in the low position), a ladder or the like is not required for the work, and the fixing means can be operated without swinging the multi-stage jib. Since it can be operated, the fixing means can be easily handled. Further, when the multi-stage jib is held and stored, the proper position near the tip of the inner jib and the proximal boom are connected so that the inner jib can swing in the left-right direction of the boom with respect to the proximal boom. Therefore, even if the multi-stage jib is stored in a state that is not parallel to the telescopic boom, there is no problem in forming the main hook passage space when the multi-stage jib is stored on the bottom side of the telescopic boom. There is an effect that can be done.
【００１２】[0012]
図１から図４を参照して本考案の実施例を説明すると、この実施例の多段ジブ 付きクレーンは、例えば車両搭載用として使用されるもので、旋回台Ａ上に起伏 自在に枢着された伸縮ブーム１と、該伸縮ブーム１を起伏せしめる起伏シリンダ ２と、ウインチ４によって巻上げ・巻下げ操作される主フック５と、伸縮ブーム １の先端部に着脱自在に装着される多段ジブ３とを備えている。 An embodiment of the present invention will be described with reference to FIGS. 1 to 4. A crane with a multi-stage jib of this embodiment is used, for example, for mounting on a vehicle, and is pivotally mounted on a swivel base A so as to be capable of hoisting. And a telescopic boom 1, a hoisting cylinder 2 for hoisting the telescopic boom 1, a main hook 5 that is hoisted and unwound by a winch 4, and a multistage jib 3 that is detachably attached to the tip of the telescopic boom 1. Is equipped with.
【００１３】 伸縮ブーム１は、図示例では基端ブーム１１と先端ブーム２１とからなる２段 伸縮式のものが採用されている。尚、他の実施例では、伸縮ブーム１を構成する ブームの本数は３本以上でもよい。In the illustrated example, the telescopic boom 1 is a two-stage telescopic type including a base end boom 11 and a tip boom 21. In another embodiment, the telescopic boom 1 may have three or more booms.
【００１４】 起伏シリンダ２の先端側は、基端ブーム１１のやや基端部寄り下面の幅方向中 央部に連結されている。尚、大型のクレーン車では、左右２本の起伏シリンダを 備えたものもあるが、その場合も起伏シリンダの先端部は基端ブーム１１の下面 に連結される。The tip end side of the undulating cylinder 2 is connected to the widthwise center portion of the lower surface of the base end boom 11 slightly closer to the base end portion. Some large crane vehicles are provided with two undulating cylinders on the left and right, but in this case as well, the tip of the undulating cylinder is connected to the lower surface of the base boom 11.
【００１５】 主フック５は、先端ブーム２１の先端部２３から吊下げられている。The main hook 5 is suspended from the tip portion 23 of the tip boom 21.
【００１６】 多段ジブ３は、外側ジブ３１と該外側ジブ３１内に伸縮自在に嵌挿された内側 ジブ４１とで構成されている。The multi-stage jib 3 is composed of an outer jib 31 and an inner jib 41 fitted in the outer jib 31 so as to be able to extend and contract.
【００１７】 外側ジブ３１の基端部３２側には、左右２本の脚部３４，３４が突出形成され ている。この各脚部３４，３４間には主フック５を経過せしめ得る主フック経過 空間３５が形成されている。又、外側ジブ３１の先端部３３には、該外側ジブ３ １と内側ジブ４１とを固定するための固定手段９の一部となるピン穴３８が形成 されている。Two leg parts 34, 34 on the left and right sides are formed so as to project on the base end part 32 side of the outer jib 31. A main hook passage space 35 through which the main hook 5 can pass is formed between the leg portions 34, 34. Further, a pin hole 38 which is a part of a fixing means 9 for fixing the outer jib 31 and the inner jib 41 is formed in the tip portion 33 of the outer jib 31.
【００１８】 内側ジブ４１は、図示例では外側ジブ３１とほぼ同長さを有している。又、内 側ジブ４１には、その基端部４２寄り位置と中間部と先端部４３寄り位置の３箇 所にそれぞれピン穴４６，４７，４８が形成されている。この各ピン穴４６〜４ ８は、それぞれ外側ジブ３１側のピン穴３８に重合し得るもので、基端部寄りピ ン穴４６は内側ジブ４１が最伸長したときに外側ジブ３１側のピン穴３８に重合 し、中間部ピン穴４７は内側ジブ４１が中間伸長したときに該外側ジブ３１側の ピン穴３８に重合し、さらに先端部ピン穴４８は内側ジブ４１が最縮小したとき に外側ジブ３１側のピン穴３８に重合するようになっている。そして、該両ピン 穴にピン３０を差し込むことによって外側ジブ３１と内側ジブ４１とを所定の伸 縮位置で固定し得るようになっている。尚、この実施例では、外側ジブ３１側の ピン穴３８と、内側ジブ４１側の中間部ピン穴４７と、両ピン穴に差し込まれる ピン３０とで請求範囲中の固定手段９を構成している。The inner jib 41 has substantially the same length as the outer jib 31 in the illustrated example. Further, the inner jib 41 is formed with pin holes 46, 47 and 48 at three positions, namely, a position near the base end 42, a position near the middle part and a position near the tip 43. Each of the pin holes 46 to 48 can be overlapped with the pin hole 38 on the outer jib 31 side, and the pin hole 46 near the base end portion is a pin on the outer jib 31 side when the inner jib 41 is fully extended. The inner pin hole 47 overlaps with the hole 38, the intermediate pin hole 47 overlaps with the pin hole 38 on the outer jib 31 side when the inner jib 41 extends midway, and the tip pin hole 48 further overlaps when the inner jib 41 contracts. The pin holes 38 on the outer jib 31 side are overlapped with each other. Then, the outer jib 31 and the inner jib 41 can be fixed at a predetermined expansion / contraction position by inserting the pin 30 into the both pin holes. In this embodiment, the pin hole 38 on the outer jib 31 side, the intermediate pin hole 47 on the inner jib 41 side, and the pin 30 inserted into both pin holes constitute the fixing means 9 in the claims. There is.
【００１９】 この多段ジブ３は、外側ジブ３１の各脚部３４，３４の基端部を先端ブーム２ １の先端部２３の左右両側部にそれぞれ外向きに突出させた軸２４，２４に着脱 自在で且つ上下回動自在に連結することによって、伸縮ブーム１の下面側に格納 される下抱き格納位置とブーム前方に突出する前方張り出し位置との間で回動し 得るように装着されている。各脚部３４，３４の基端部と各軸２４，２４とは、 多段ジブ３が伸縮ブーム１に対してブーム左右方向に若干角度だけ揺動し得る状 態で連結されている。The multi-stage jib 3 is attached to and detached from the shafts 24 and 24 in which the base end portions of the leg portions 34 and 34 of the outer jib 31 are outwardly projected to the left and right side portions of the tip portion 23 of the tip boom 21. It is mounted so as to be rotatable between a lower hugging storage position that is stored on the lower surface side of the telescopic boom 1 and a forward projecting position that projects forward of the boom, by being freely and vertically pivotally connected. .. The base ends of the legs 34, 34 and the shafts 24, 24 are connected to each other in such a manner that the multi-stage jib 3 can swing slightly with respect to the telescopic boom 1 in the boom left-right direction.
【００２０】 多段ジブ３の下抱き格納状態においては、基端ブーム１１の下面に起伏シリン ダ２の先端部が連結されている関係上、該多段ジブ３が伸縮ブーム１に対して非 平行状態（多段ジブ３の先端側がブーム左右方向の一側に変位している）で格納 される。When the multi-stage jib 3 is stored in the hugging state, the multi-stage jib 3 is not parallel to the telescopic boom 1 because the tip of the undulating cylinder 2 is connected to the lower surface of the base boom 11. (The tip side of the multi-stage jib 3 is displaced to one side in the left-right direction of the boom).
【００２１】 又、多段ジブ３の下抱き格納状態において、図１及び図２に示すように内側ジ ブ４１が最縮小している状態（符号３８と４８の各ピン穴にピン３０が差し込ま れている）では、該内側ジブ４１の基端部４２が主フック経過空間３５内にかな りの長さだけ入り込むようになり、又図４に示すように該内側ジブ４１の中間伸 長状態（符号３８と４７の各ピン穴にピン３０が差し込まれている）では、内側 ジブ４１の基端部４２が主フック経過空間３５外に位置するようになっている。 即ち、内側ジブ４１の中間伸長状態では、内側ジブ４１の基端部４２と多段ジブ 回動用の軸２４までの長さ（図４のＬ1の長さ）が、該軸２４から最巻上げ状態 にある主フック５の下端までの長さ（図４のＭ1の長さ）よりやや長くなるよう に設計している。Further, in the state where the multi-stage jib 3 is stored under the body, the inner jib 41 is in the most contracted state as shown in FIGS. 1 and 2 (the pins 30 are inserted into the pin holes 38 and 48, respectively). In this case, the base end portion 42 of the inner jib 41 is inserted into the main hook passage space 35 by a considerable length, and as shown in FIG. The pin 30 is inserted into each of the pin holes 38 and 47), the base end portion 42 of the inner jib 41 is located outside the main hook passage space 35. That is, in the intermediate extension state of the inner jib 41, the length from the base end portion 42 of the inner jib 41 to the shaft 24 for rotating the multistage jib (the length of L 1 in FIG. 4) from the shaft 24 to the maximum winding state. It is designed to be a little longer than the length to the lower end of the main hook 5 (the length of M 1 in FIG. 4).
【００２２】 さらに多段ジブ３は、内側ジブ４１の先端部ピン穴４８が外側ジブ３１のピン 穴３８に重合する位置から該内側ジブ４１の基端部ピン穴４６が該外側ジブ３１ のピン穴３８に重合するまでの長範囲Ｎ1内で伸縮し得るようになっている。即 ち、最縮小状態において内側ジブ４１の基端部が主フック経過空間３５内に入り 込んでいる分だけ内側ジブ４１の伸縮ストロークを大きくすることができるよう になっている。Further, in the multi-stage jib 3, from the position where the tip end pin hole 48 of the inner jib 41 overlaps with the pin hole 38 of the outer jib 31, the base end pin hole 46 of the inner jib 41 becomes the pin hole of the outer jib 31. It can be expanded and contracted within a long range N 1 until it is polymerized to 38. That is, in the fully contracted state, the expansion / contraction stroke of the inner jib 41 can be increased by the amount that the base end portion of the inner jib 41 is inserted into the main hook passage space 35.
【００２３】 この多段ジブ付きクレーンでは、多段ジブ３の不使用時には、外側ジブ３１の 基端部３２（脚部３４，３４の基端部）が先端ブーム先端部２３の軸２４，２４ から分離されて多段ジブ３全体が基端ブーム１１に支持される。即ち、外側ジブ ３１の基端部３２が固定手段１０で固定されるとともに内側ジブ４１の先端部４ ３が連結手段８によって連結されている。In this multi-stage jib-equipped crane, when the multi-stage jib 3 is not used, the base end 32 of the outer jib 31 (base ends of the legs 34, 34) is separated from the shafts 24, 24 of the tip boom tip 23. As a result, the entire multi-stage jib 3 is supported by the base end boom 11. That is, the base end portion 32 of the outer jib 31 is fixed by the fixing means 10, and the tip end portion 43 of the inner jib 41 is connected by the connecting means 8.
【００２４】 内側ジブ４１の先端部４３を連結している連結手段８は、図３に示すように基 端ブーム１１側に設けたブラケット８１の穴８２と、内側ジブ先端部４３に設け たブラケット８３の穴８４とにピン８５を挿入することによって行われる。又、 該両穴８２，８４にピン８５を挿入した状態（内側ジブ先端部４３を基端ブーム １１に連結した状態）においては、該内側ジブ４１が基端ブーム１１に対してブ ーム左右方向に揺動し得るようになつている。As shown in FIG. 3, the connecting means 8 for connecting the tip portion 43 of the inner jib 41 includes a hole 82 of a bracket 81 provided on the proximal boom 11 side and a bracket provided on the tip portion 43 of the inner jib. This is done by inserting a pin 85 into the hole 84 of 83. Further, when the pin 85 is inserted into both the holes 82 and 84 (the inner jib tip portion 43 is connected to the base boom 11), the inner jib 41 is left and right with respect to the base boom 11. It can swing in any direction.
【００２５】 図示の多段ジブ付きクレーンにおいては、多段ジブ３の不使用時には外側ジブ ３１の各脚部３４，３４が各軸２４，２４から分離されるとともに、固定手段１ ０と連結手段８とによって多段ジブ３が基端ブーム１１に支持されて格納姿勢に ある。そして、多段ジブ３の格納姿勢から、該多段ジブ３を使用位置、即ち前方 張り出し位置に装着するには、主フック５を最巻上げした状態で、まず各脚部３ ４，３４の基端部を先端ブーム先端部２３の各軸２４，２４に連結し、外側ジブ ３１と基端ブーム１１との固定手段１０の固定を解除する。尚、このとき、内側 ジブ４１の先端部４３と基端ブーム１１とは連結手段８で連結されている。そし て、固定手段９のピン３０を抜き外し、伸縮ブーム１をゆっくり伸長させて外側 ジブ先端部３３のピン穴３８を内側ジブ４１側の中間部ピン穴４７に重合させ、 該両ピン穴３８，４７にピン３０を差し込んで外側ジブ３１と内側ジブ４１とを 固定する。この状態では、図４に実線図示する如く、軸２４から内側ジブ４１の 基端部４２までの長さＬ1が該軸２４から主フック５の下端までの長さＭ1よりや や長くなっており、外側ジブ３１の基端部に主フック５を経過させ得る主フック 経過空間３５が形成されるようになる。この状態で、もう１つのウインチ６から 繰り出されたワイヤー６２を先端ブーム先端部２３の各シーブ６３，６４及び内 側ジブ先端部４３のシーブ６５に掛け回してそのワイヤー先端を基端ブーム１１ に固定して、該ワイヤー６２で多段ジブ３を支持し、その後、連結手段８のピン ８５を符号８５′で示すように抜き外し、且つ伸縮ブーム１を内側ジブ先端部４ ３のブラケット８３が基端ブーム１１側のブラケット８１から外れるまで伸長さ せ、続いてウインチ６をゆっくり巻戻して多段ジブ３を図４において鎖線３′で 示すようにその自重により鉛直姿勢まで下方に回動させる。このとき、伸縮ブー ム１は所定角度だけ立ち起こして行う。次に、図８に示す公知例と同様に、ワイ ヤー６２の先端を基端ブーム１１側から多段ジブ３の先端部につけ変えた後、ウ インチ６を巻上げると、多段ジブ３を前方張り出し位置まで回動させることがで きる。その後、図示しないテンション装置により、多段ジブ３を前方張り出し位 置で支持すれば、多段ジブ３の前方張り出し操作は完了する。尚、前方張り出し 位置にある多段ジブ３を下抱き格納位置まで戻すには、上記と逆順序で行えばよ い。In the illustrated multi-stage jib-equipped crane, when the multi-stage jib 3 is not used, the legs 34, 34 of the outer jib 31 are separated from the shafts 24, 24, and the fixing means 10 and the connecting means 8 are provided. The multi-stage jib 3 is supported by the base boom 11 and is in the retracted posture. Then, in order to mount the multi-stage jib 3 from the retracted posture to the use position, that is, the forward projecting position, first, with the main hook 5 being maximally wound up, first the base end portions of the leg portions 34 and 34 are to be installed. Is connected to the shafts 24, 24 of the tip boom tip 23, and the fixing of the fixing means 10 between the outer jib 31 and the base boom 11 is released. At this time, the tip end portion 43 of the inner jib 41 and the base end boom 11 are connected by the connecting means 8. Then, the pin 30 of the fixing means 9 is pulled out and the telescopic boom 1 is slowly extended to cause the pin hole 38 of the outer jib tip 33 to overlap with the intermediate pin hole 47 on the inner jib 41 side. , 47 to fix the outer jib 31 and the inner jib 41. In this state, as shown by the solid line in FIG. 4, the length L 1 from the shaft 24 to the base end portion 42 of the inner jib 41 is slightly longer than the length M 1 from the shaft 24 to the lower end of the main hook 5. Therefore, a main hook passage space 35 through which the main hook 5 can pass is formed at the base end portion of the outer jib 31. In this state, the wire 62 unwound from the other winch 6 is wound around the sheaves 63, 64 of the tip boom tip 23 and the sheave 65 of the inner jib tip 43, and the wire tip is attached to the base boom 11. After fixing, the multistage jib 3 is supported by the wire 62, and then the pin 85 of the connecting means 8 is removed as indicated by reference numeral 85 ', and the telescopic boom 1 is attached to the bracket 83 of the inner jib tip 43. The end boom 11 is extended until it is disengaged from the bracket 81, and then the winch 6 is slowly rewound to rotate the multi-stage jib 3 downward to its vertical position by its own weight as shown by a chain line 3'in FIG. At this time, the telescopic boom 1 is raised by a predetermined angle. Next, similarly to the known example shown in FIG. 8, after changing the tip of the wire 62 from the base end boom 11 side to the tip of the multi-stage jib 3, the winch 6 is wound up, and the multi-stage jib 3 is projected forward. It can be rotated to the position. After that, the tension device (not shown) supports the multi-stage jib 3 in the forward projecting position, and the forward projecting operation of the multi-stage jib 3 is completed. In addition, in order to return the multi-stage jib 3 in the forward projecting position to the lower hugging / storing position, the order may be reversed.
【００２６】 このように、図示の多段ジブ付きクレーンによれば、内側ジブ４１の伸縮スト ロークを大きくでき、しかもそのように内側ジブの伸縮ストロークを大きくした ものであっても、多段ジブ３の前方張り出し操作時あるいは下抱き格納操作時に おける外側ジブ３１と内側ジブ４１との固定手段９の着脱操作時に、多段ジブ３ を基端ブーム１１の下面に沿って２点支持した状態で行えるので、該固定手段９ の着脱操作が簡単となり、さらにその着脱操作を安全に行える。又、該固定手段 ９の着脱操作を、伸縮ブーム１をほぼ水平姿勢まで倒した状態、即ち低位置で行 えるので、その着脱操作時に、はしご等が不要となる。さらに、内側ジブ先端部 ４３と基端ブーム１１との間の連結手段８を、該多段ジブ３が伸縮ブーム１に対 してブーム左右方向に揺動自在なる如く連結しているので、多段ジブ３を伸縮ブ ーム１の下面側に格納した状態のままで、多段ジブ３の基端部側に主フック経過 空間３５を支障なく形成することができる。As described above, according to the illustrated multi-stage jib-equipped crane, the extension stroke of the inner jib 41 can be increased, and even if the extension stroke of the inner jib is increased as described above, Since the multi-stage jib 3 can be supported at two points along the lower surface of the base end boom 11 at the time of attaching / detaching the fixing means 9 for the outer jib 31 and the inner jib 41 during the forward extension operation or the underarm holding operation, The attaching / detaching operation of the fixing means 9 is simplified, and the attaching / detaching operation can be performed safely. Further, since the attaching / detaching operation of the fixing means 9 can be performed in a state in which the telescopic boom 1 is tilted to a substantially horizontal posture, that is, at a low position, a ladder or the like is not required at the time of the attaching / detaching operation. Further, the connecting means 8 between the inner jib tip portion 43 and the base end boom 11 is connected so that the multistage jib 3 can swing relative to the telescopic boom 1 in the boom left-right direction. The main hook passage space 35 can be formed on the base end side of the multi-stage jib 3 without hindrance while the 3 is stored in the lower surface side of the telescopic boom 1.
【００２７】 尚、他の実施例では、多段ジブ３の格納状態から、基端ブーム１１の基端部３ ２に主フック経過空間３５を形成するに際して、次のようにして行うことができ る。即ち、多段ジブ３側に、外側ジブ３１と内側ジブ４１とを伸縮せしめる伸縮 機構を備え、且つ多段ジブ３の格納状態では、内側ジブ４１の基端部４２寄り位 置を基端ブーム１１に着脱自在に固定する一方で、連結手段８により内側ジブ４ １の先端部４３を基端ブーム１１に連結しておく。この状態では、外側ジブ３１ が内側ジブ４１に対して、主フック経過空間３５を形成するのに必要な長さは伸 縮し得るようになっている。そして、上記主フック経過空間３５を形成するには 、伸縮ブーム１を所定の中間伸長状態まで伸長させ、且つ外側ジブ３１を伸縮フ リーにした状態で、多段ジブ３側の伸縮機構を伸長させて外側ジブ３１の基端部 ３２を先端ブーム先端部２３の軸２４に合致させ、該外側ジブ基端部３２を軸２ ４に連結させればよい。又、このように多段ジブ３に伸縮機構を設けたものにお いて、該伸縮機構として伸縮シリンダを使用すると、該伸縮シリンダを、外側ジ ブ３１と内側ジブ４１とを中間伸長状態で固定するための固定手段９として利用 することができる。In another embodiment, when the main hook passage space 35 is formed in the base end portion 32 of the base end boom 11 from the retracted state of the multi-stage jib 3, it can be performed as follows. .. That is, the multi-stage jib 3 side is provided with an expansion / contraction mechanism for expanding / contracting the outer jib 31 and the inner jib 41, and when the multi-level jib 3 is stored, the position of the inner jib 41 close to the base end 42 is fixed to the base boom 11. While being detachably fixed, the tip portion 43 of the inner jib 41 is connected to the base boom 11 by the connecting means 8. In this state, the outer jib 31 can be expanded and contracted with respect to the inner jib 41 by a length required to form the main hook passage space 35. Then, in order to form the main hook passage space 35, the telescopic boom 1 is extended to a predetermined intermediate extension state, and the extension mechanism on the multi-stage jib 3 side is extended with the outer jib 31 being in the extension / contraction free state. Then, the base end portion 32 of the outer jib 31 may be aligned with the shaft 24 of the tip boom tip portion 23, and the outer jib base end portion 32 may be connected to the shaft 24. Further, in such a multi-stage jib 3 provided with a telescopic mechanism, when an telescopic cylinder is used as the telescopic mechanism, the telescopic cylinder fixes the outer jib 31 and the inner jib 41 in an intermediate extended state. It can be used as a fixing means 9 for
【００２８】 又、図示の実施例では、多段ジブ３は基端ブーム１１の下面側に支持された状 態で格納されているが、他の実施例では、多段ジブ３を基端ブーム下面側の下抱 き位置から基端ブーム１１の側面に沿った横抱き位置まで変位させた状態で最終 格納するようにしてもよい。In the illustrated embodiment, the multi-stage jib 3 is stored in a state of being supported on the lower surface side of the base end boom 11, but in other embodiments, the multi-stage jib 3 is attached to the lower surface side of the base end boom. It may be finally stored while being displaced from the lower hugging position to the horizontal hugging position along the side surface of the base end boom 11.
【図１】本考案の実施例にかかる多段ジブ付きクレーン
の側面図である。FIG. 1 is a side view of a crane with a multi-stage jib according to an embodiment of the present invention.
【図２】図１の一部平面図である。FIG. 2 is a partial plan view of FIG.
【図３】図１の多段ジブ付きクレーンにおける連結手段
部分の分解斜視図である。FIG. 3 is an exploded perspective view of a connecting means portion in the multi-stage jib-mounted crane of FIG.
【図４】図１の多段ジブ付きクレーンの状態変化図であ
る。FIG. 4 is a state change diagram of the multi-stage jib-equipped crane of FIG. 1.
【図５】従来の多段ジブ付きクレーンの側面図である。FIG. 5 is a side view of a conventional multi-stage jib-mounted crane.
【図６】図５の一部平面図である。FIG. 6 is a partial plan view of FIG.
【図７】公知の多段ジブ付きクレーンの側面図である。FIG. 7 is a side view of a known multi-stage jib-mounted crane.
【図８】図７の状態変化図である。FIG. 8 is a state change diagram of FIG. 7.
１は伸縮ブーム、２は起伏シリンダ、３は多段ジブ、５
は主フック、８は連結手段、９は固定手段、１１は基端
ブーム、２１は先端ブーム、２３は先端部、２４は軸、
３１は外側ジブ、３２は基端部、３４は脚部、３５は主
フック経過空間、４１は内側ジブ、４２は基端部であ
る。1 is a telescopic boom, 2 is a hoisting cylinder, 3 is a multi-stage jib, 5
Is a main hook, 8 is a connecting means, 9 is a fixing means, 11 is a base boom, 21 is a tip boom, 23 is a tip portion, 24 is a shaft,
31 is an outer jib, 32 is a base end, 34 is a leg, 35 is a main hook passage space, 41 is an inner jib, and 42 is a base end.
Claims (1)
自在に嵌挿してなる伸縮ブーム（１）と、該伸縮ブーム
（１）の先端ブーム（２１）の先端部（２３）から巻上
げ・巻下げ自在に吊下げた主フック（５）と、外側ジブ
（３１）内に内側ジブ（４１）を伸縮自在に嵌挿してな
る多段ジブ（３）とを備え、さらに前記外側ジブ（３
１）の基端部（３２）側に、前記主フック（５）を経過
せしめ得る主フック経過空間（３５）を設けた状態で左
右２つの脚部（３４，３４）を設け、該各脚部（３４，
３４）の基端部をそれぞれ前記先端ブーム先端部（２
３）の左右両側部に枢着して、前記多段ジブ（３）が前
記伸縮ブーム（１）の下面側に格納される下抱き格納位
置と先端ブーム先端部（２３）の前方に突出する前方張
り出し位置との間で上下方向に回動し得る如くし、しか
も前記多段ジブ（３）が下抱き格納位置にあるときに、
該多段ジブ（３）が伸縮ブーム（１）に対して平面視に
おいて非平行状態となる如くした多段ジブ付きクレーン
であって、 前記多段ジブ（３）は、該多段ジブ（３）の最縮小状態
において前記内側ジブ（４１）の基端部（４２）が前記
外側ジブ（３１）の前記主フック経過空間（３５）内に
位置するように構成するとともに、 前記内側ジブ（４１）の先端部寄り適所と前記基端ブー
ム（１１）の間に、前記多段ジブ（３）の下抱き格納状
態において、連結・分離自在で且つ該内側ジブ（４１）
がブーム伸長方向に移動するのを禁止ししかも該内側ジ
ブ（４１）が基端ブーム（１１）に対してブーム左右方
向に揺動するのを許容する状態で連結する連結手段
（８）を設け、 さらに前記外側ジブ（３１）と前記内側ジブ（４１）間
に、該内側ジブ（４１）の基端部（４２）が前記主フッ
ク経過空間（３５）内に位置しない中間伸長位置で前記
内側ジブ（４１）を前記外側ジブ（３１）に固定する固
定手段（９）を設けた、 ことを特徴とする多段ジブ付きクレーン。1. A telescopic boom (1) in which two or more booms (11, 21) are telescopically inserted, and hoisting from a tip portion (23) of a tip boom (21) of the telescopic boom (1). A main hook (5) that can be freely hung, and a multi-stage jib (3) in which the inner jib (41) is telescopically inserted in the outer jib (31), and the outer jib (3)
1) Two leg portions (34, 34) on the left and right sides are provided on the side of the base end portion (32) of the main hook (35) that allows the passage of the main hook (5). Department (34,
34) the base end of each of the tip boom parts (2)
3) A pivotingly attached to both left and right sides, the multi-stage jib (3) is housed on the lower surface side of the telescopic boom (1), and a forwardly projecting position in front of the tip end portion (23) of the lower boom. When the multi-stage jib (3) is in the lower hugging storage position, it is possible to rotate vertically with respect to the projecting position.
A crane with a multi-stage jib in which the multi-stage jib (3) is in a non-parallel state with respect to the telescopic boom (1) in a plan view, wherein the multi-stage jib (3) is the smallest reduction of the multi-stage jib (3). In the state, the proximal end portion (42) of the inner jib (41) is configured to be located in the main hook passage space (35) of the outer jib (31), and the distal end portion of the inner jib (41) is configured. The inner jib (41) is freely connectable / separable between the proper position and the base boom (11) when the multistage jib (3) is held and stored.
A connecting means (8) for connecting the inner jib (41) to the base boom (11) in a state where the inner jib (41) is prevented from moving in the boom extension direction. Further, between the outer jib (31) and the inner jib (41), the inner end of the inner jib (41) at the intermediate extension position in which the proximal end portion (42) is not located in the main hook passage space (35). A multi-stage jib-equipped crane, comprising a fixing means (9) for fixing the jib (41) to the outer jib (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2279892U JP2570505Y2 (en) | 1992-04-10 | 1992-04-10 | Crane with multi-stage jib |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2279892U JP2570505Y2 (en) | 1992-04-10 | 1992-04-10 | Crane with multi-stage jib |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0582981U true JPH0582981U (en) | 1993-11-09 |
| JP2570505Y2 JP2570505Y2 (en) | 1998-05-06 |
Family
ID=12092709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2279892U Expired - Fee Related JP2570505Y2 (en) | 1992-04-10 | 1992-04-10 | Crane with multi-stage jib |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2570505Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013018576A (en) * | 2011-07-08 | 2013-01-31 | Tadano Ltd | Extension method of telescopic jib in crane with telescopic jib |
| WO2018052050A1 (en) * | 2016-09-13 | 2018-03-22 | 株式会社タダノ | Crane |
-
1992
- 1992-04-10 JP JP2279892U patent/JP2570505Y2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013018576A (en) * | 2011-07-08 | 2013-01-31 | Tadano Ltd | Extension method of telescopic jib in crane with telescopic jib |
| WO2018052050A1 (en) * | 2016-09-13 | 2018-03-22 | 株式会社タダノ | Crane |
| JPWO2018052050A1 (en) * | 2016-09-13 | 2018-09-13 | 株式会社タダノ | crane |
| CN109689562A (en) * | 2016-09-13 | 2019-04-26 | 株式会社多田野 | Crane |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2570505Y2 (en) | 1998-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |