JP4791734B2

JP4791734B2 - Telescopic boom of work vehicle

Info

Publication number: JP4791734B2
Application number: JP2005019743A
Authority: JP
Inventors: 達也早川; 陽一早川
Original assignee: Aichi Corp
Current assignee: Aichi Corp
Priority date: 2005-01-27
Filing date: 2005-01-27
Publication date: 2011-10-12
Anticipated expiration: 2025-01-27
Also published as: JP2006206242A

Description

本発明は、高所作業車やクレーン車等の作業車において、作業台や懸吊装置の移動手段として走行体に取り付けて使用される作業車の伸縮ブームに関する。 The present invention relates to a telescopic boom of a work vehicle that is used by being attached to a traveling body as a moving means for a work table or a suspension device in a work vehicle such as an aerial work vehicle or a crane vehicle.

高所作業車やクレーン車等において作業台や懸吊装置等を移動する装置として従来伸縮ブームが用いられている。伸縮ブームは中空柱状で外径及び内径が順次小さくなる複数のブーム部材が入れ子式に構成されており、最も外径の大きい第１ブームが走行体に取り付けられている。第１ブームと走行体との間には油圧シリンダ（ブーム起伏シリンダ）が跨設されており、この油圧シリンダの伸縮作動によって伸縮ブーム全体を起伏動させることができるようになっている。また、伸縮ブームは内部に設けられた油圧シリンダ（ブーム伸縮シリンダ）の伸縮作動によって長手方向に伸縮動させることができるようになっている。伸縮ブームの伸縮形式には種々のものが知られているが、第１ブームと第２ブーム（第１ブームの次に外径及び内径の大きいブーム部材）との伸縮のみを油圧シリンダの作動によって行い、その他のブーム部材間の伸縮作動はブーム部材同士の間に設けられたプーリ・ワイヤ機構によって第１ブームと第２ブームとの間の伸縮作動と連動して行う形式のものが多く用いられている（例えば、下記の特許文献参照）。 Conventionally, a telescopic boom is used as a device for moving a work table, a suspension device or the like in an aerial work vehicle or a crane vehicle. The telescopic boom has a hollow columnar shape, and a plurality of boom members whose outer diameter and inner diameter are sequentially reduced are nested, and the first boom having the largest outer diameter is attached to the traveling body. A hydraulic cylinder (boom hoisting cylinder) is straddled between the first boom and the traveling body, and the entire telescopic boom can be raised and lowered by the telescopic operation of the hydraulic cylinder. The telescopic boom can be expanded and contracted in the longitudinal direction by an expansion and contraction operation of a hydraulic cylinder (boom telescopic cylinder) provided therein. Various types of expansion / contraction booms are known, but only the expansion / contraction of the first boom and the second boom (the boom member having the outer diameter and the inner diameter next to the first boom) is performed by the operation of the hydraulic cylinder. The other telescopic operation between the boom members is often performed in conjunction with the telescopic operation between the first boom and the second boom by a pulley / wire mechanism provided between the boom members. (For example, see the following patent document).

また、伸縮ブームの内部には、走行体側から作業機（高所作業車であれば作業台）側に各種信号を送信するための信号伝送ケーブルや作業機側へ圧油を供給するための送油ホースなどのライン状部材が通されている。このライン状部材は伸縮ブームの伸縮作動に応じて全体として伸縮するようにブーム部材の内部に配置されている。
特開２０００−１０４７９３号公報特開２０００−１６９０９５号公報 In addition, inside the telescopic boom, a signal transmission cable for transmitting various signals from the traveling body side to the work machine (a work platform in the case of an aerial work vehicle) side and a transmission for supplying pressure oil to the work machine side. A line-shaped member such as an oil hose is passed. The line-shaped member is disposed inside the boom member so as to expand and contract as a whole in accordance with the expansion and contraction operation of the telescopic boom.
JP 2000-104793 A JP 2000-169095 A

しかしながら、従来においては伸縮ブームの内部に配置された油圧シリンダをライン状部材のブーム部材内における固定具として利用するなどしていたため、伸縮ブームの内部構造の修理やメンテナンス作業等において油圧シリンダを取り外すときにはライン状部材も取り外す必要があり、作業が複雑になって作業に要するコストが高くなるという問題があった。 However, in the past, the hydraulic cylinder disposed inside the telescopic boom has been used as a fixture in the boom member of the line-like member, and therefore, the hydraulic cylinder is removed for repair or maintenance work of the internal structure of the telescopic boom. In some cases, it is necessary to remove the line-shaped member, which causes a problem that the work becomes complicated and the cost required for the work increases.

本発明はこのような問題に鑑みてなされたものであり、内部構造の修理やメンテナンスを容易に行うことができ、これらの作業に対するコストを低減することが可能な構成の作業車の伸縮ブームを提供することを目的としている。 The present invention has been made in view of such a problem, and an extendable boom for a work vehicle having a configuration capable of easily repairing and maintaining an internal structure and reducing costs for these operations. It is intended to provide.

第１の本発明に係る作業車の伸縮ブームは、走行体に起伏動自在に取り付けられ、先端部に作業機(例えば、実施形態における作業台４０)を有する作業車の伸縮ブームであって、第１ブーム、第２ブーム、第３ブーム及び第４ブームがこの順で入れ子式に構成され、第１ブームの基端部が走行体に取り付けられたブーム本体と、シリンダチューブ及びシリンダチューブに対して軸方向に相対移動自在なピストンロッドからなり、ブーム本体内においてシリンダチューブ及びピストンロッドの一方が第１ブームに取り付けられるとともに他方が第２ブームに取り付けられてブーム本体の軸線とほぼ平行に延びて設けられた油圧シリンダ(例えば、実施形態におけるブーム伸縮シリンダ５２)と、油圧シリンダの伸縮作動により第２ブームが第１ブームに対して相対移動することに伴って、第３ブームを第２ブームに対して相対移動させるとともに第４ブームを第３ブームに対して相対移動させてブーム本体を軸線方向に伸縮作動させるブーム伸縮機構（例えば、実施形態におけるプーリ・ワイヤ機構）と、ブーム本体内においてブーム本体の基端側から先端側へ延びて設けられたライン状部材と、ブーム本体内において基端側が第３ブームに取り付けられて油圧シリンダの下方に位置してブーム本体の軸線とほぼ平行に延びるとともに、先端側に第４ブームの内周下面上を転動するローラ又は摺動する摺動部材を有したガイド部材と、基端部が第１ブームの内周下面に取り付けられるとともに先端部がガイド部材の基端側又は第３ブーム内に取り付けられ、内部にライン状部材を保護するとともにブーム本体の伸縮作動に伴って変形してライン状部材を案内する第１保護案内部材と、基端部がガイド部材の先端側又は第３ブーム内に取り付けられるとともに先端部が第４ブームの内周下面に取り付けられ、内部にライン状部材を保護するとともにブーム本体の伸縮作動に伴って変形してライン状部材を案内する第２保護案内部材とを備え、ライン状部材が、ブーム本体内における油圧シリンダの下方領域において、ブーム本体の基端側から第１保護案内部材、ガイド部材および第２保護案内部材の順にそれぞれにより案内されて前記ブーム本体の先端側へ延びて設けられる。 The telescopic boom of the work vehicle according to the first aspect of the present invention is a telescopic boom of a work vehicle that is attached to the traveling body so as to be able to move up and down and has a work machine (for example, the work table 40 in the embodiment) at the tip. The first boom, the second boom, the third boom, and the fourth boom are nested in this order, and the base end of the first boom is attached to the traveling body, and the cylinder tube and the cylinder tube. In the boom body, one of the cylinder tube and the piston rod is attached to the first boom and the other is attached to the second boom, and extends substantially parallel to the axis of the boom body. The hydraulic boom (for example, the boom telescopic cylinder 52 in the embodiment) and the second boom are moved to the first boom by the telescopic operation of the hydraulic cylinder. A boom that moves the third boom relative to the second boom and moves the fourth boom relative to the third boom to extend and retract the boom body in the axial direction in association with the relative movement with respect to the boom. A telescopic mechanism (for example, the pulley / wire mechanism in the embodiment), a line-shaped member provided in the boom body extending from the proximal end side of the boom body to the distal end side, and the proximal end side in the boom body to the third boom A guide member that is mounted below the hydraulic cylinder and extends substantially parallel to the axis of the boom body, and has a roller or a sliding member that slides on the inner peripheral lower surface of the fourth boom at the tip side . If, proximal end tip with is attached to the inner peripheral lower surface of the first boom is mounted on the proximal end side or within the third boom of the guide member, for protecting the linear member within Both the first protective guide member that is deformed in accordance with the expansion and contraction operation of the boom main body and guides the line-shaped member, the base end portion is attached to the distal end side of the guide member or the third boom, and the distal end portion is the fourth boom. A second protection guide member which is attached to the inner peripheral lower surface and protects the line-shaped member inside and deforms along with the expansion and contraction operation of the boom body, and guides the line-shaped member . in the lower region of the hydraulic cylinder, the first protective guide member from the base end of the boom, it is guided by the respective order of the guide member and the second protective guide members Ru provided extending toward the distal end side of the boom.

なお、上記構成の作業車の伸縮ブームにおいて、油圧シリンダの先端部にガイド部材の上面を転動するローラを有することが好ましい。Note that the telescopic boom of the work vehicle having the above-described configuration preferably has a roller that rolls on the upper surface of the guide member at the tip of the hydraulic cylinder.

また、第２の本発明に係る作業車の伸縮ブームは、走行体に起伏動自在に取り付けられ、先端部に作業機(例えば、実施形態における作業台４０)を有する作業車の伸縮ブームであって、第１ブーム、第２ブーム、第３ブーム及び第４ブームがこの順で入れ子式に構成され、第１ブームの基端部が走行体に取り付けられたブーム本体と、シリンダチューブ及びシリンダチューブに対して軸方向に相対移動自在なピストンロッドからなり、ブーム本体内においてシリンダチューブ及びピストンロッドの一方が第１ブームに取り付けられるとともに他方が第２ブームに取り付けられてブーム本体の軸線とほぼ平行に延びて設けられた油圧シリンダ(例えば、実施形態におけるブーム伸縮シリンダ５２)と、油圧シリンダの伸縮作動により第２ブームが第１ブームに対して相対移動することに伴って、第３ブームを第２ブームに対して相対移動させるとともに第４ブームを第３ブームに対して相対移動させてブーム本体を軸線方向に伸縮作動させるブーム伸縮機構（例えば、実施形態におけるプーリ・ワイヤ機構）と、ブーム本体内においてブーム本体の基端側から先端側へ延びて設けられたライン状部材と、ブーム本体内において基端側が第３ブームに取り付けられて油圧シリンダの上方に位置してブーム本体の軸線とほぼ平行に延びるとともに、先端側に第４ブームの内周下面上を転動するローラ又は摺動する摺動部材を有したガイド部材と、基端部が第１ブームの内周上面に取り付けられるとともに先端部がガイド部材の基端側又は第３ブーム内に取り付けられ、内部にライン状部材を保護するとともにブーム本体の伸縮作動に伴って変形してライン状部材を案内する第１保護案内部材と、基端部がガイド部材の先端側又は第３ブーム内に取り付けられるとともに先端部が第４ブームの内周上面に取り付けられ、内部にライン状部材を保護するとともにブーム本体の伸縮作動に伴って変形してライン状部材を案内する第２保護案内部材とを備え、ライン状部材が、ブーム本体内における油圧シリンダの上方領域において、ブーム本体の基端側から第１保護案内部材、ガイド部材および第２保護案内部材の順にそれぞれにより案内されてブーム本体の先端側へ延びて設けられる。 The telescopic boom of the work vehicle according to the second aspect of the present invention is a telescopic boom of a work vehicle that is attached to the traveling body so as to be able to move up and down and has a work machine (for example, the work table 40 in the embodiment) at the tip. A boom body in which the first boom, the second boom, the third boom, and the fourth boom are configured in a nested manner in this order, and the base end portion of the first boom is attached to the traveling body, the cylinder tube, and the cylinder tube consists relatively movable piston rod axially relative, substantially parallel to the other is attached to the second boom axis of the boom body with one of the cylinder tube and the piston rod is attached to the first boom in the boom The hydraulic cylinder (for example, the boom telescopic cylinder 52 in the embodiment) provided to extend to the second boom and the second boom is moved by the telescopic operation of the hydraulic cylinder. Along with the relative movement with respect to the first boom, the third boom is moved with respect to the second boom and the fourth boom is moved with respect to the third boom so that the boom body is expanded and contracted in the axial direction. Boom telescopic mechanism (for example, the pulley / wire mechanism in the embodiment), a line-shaped member provided in the boom main body extending from the base end side of the boom main body to the front end side, and the base end side in the boom main body is the third boom A guide which is attached to the upper side of the hydraulic cylinder and extends substantially parallel to the axis of the boom body, and which has a roller or a sliding member which slides on the lower surface of the inner periphery of the fourth boom on the tip side . and member, proximal end tip with is attached to the inner peripheral upper surface of the first boom is mounted on the proximal end side or within the third boom of the guide member, holding the linear member within And a first protection guide member that deforms with the expansion and contraction operation of the boom body and guides the line-shaped member, and a base end portion is attached to the distal end side of the guide member or the third boom and the distal end portion is the fourth boom. And a second protection guide member that protects the line-shaped member and deforms along with the expansion and contraction operation of the boom body and guides the line-shaped member. in the upper region of the hydraulic cylinders in the inner, first protective guide member from the base end of the boom, Ru provided extending is guided toward the distal end side of the boom assembly by each in the order of the guide member and the second protective guide members.

なお、上記構成の作業車の伸縮ブームにおいて、油圧シリンダの先端部に第４ブームおよび第３ブームの内周下面上を転動するローラを有することが好ましい。In the telescopic boom of the work vehicle having the above-described configuration, it is preferable that the tip of the hydraulic cylinder has a roller that rolls on the inner peripheral lower surface of the fourth boom and the third boom.
また、上記構成の作業車の伸縮ブームにおいて、ブーム本体内において基端側が第２ブームに取り付けられるとともに先端側がブーム本体の伸縮作動に伴ってガイド部材に対してスライド移動自在にガイド部材に取り付けられ、上面において第１保護案内部材の中間部を支持する第２ガイド部材を備えることが好ましい。In the telescopic boom of the work vehicle having the above configuration, the base end side is attached to the second boom in the boom body, and the distal end side is attached to the guide member so as to be slidable with respect to the guide member in accordance with the telescopic operation of the boom body. It is preferable that a second guide member that supports an intermediate portion of the first protective guide member on the upper surface is provided.

第１の本発明に係る作業車の伸縮ブームでは、油圧シリンダはそれ自体単独でブーム本体に結合されており、ライン状部材は油圧シリンダの下方領域を延びて設けられている。このためガイド部材がブーム本体内に取り付けられている状態では、ブーム伸縮シリンダはライン状部材のブーム本体への取り付け状態とは無関係にブーム本体に対する着脱が可能であり、同様にライン状部材はブーム伸縮シリンダのブーム本体への取り付け状態とは無関係にブーム本体に対する着脱が可能である。このため伸縮ブームの内部構造の修理やメンテナンスを容易に行うことができ、これらの作業に要するコストを低減することが可能である。 In the telescopic boom of the work vehicle according to the first aspect of the present invention, the hydraulic cylinder is itself connected to the boom body alone, and the line member is provided extending in the lower region of the hydraulic cylinder. For this reason, in a state where the guide member is mounted in the boom body, the boom telescopic cylinder can be attached to and detached from the boom body regardless of the state in which the line-shaped member is mounted on the boom body. The telescopic cylinder can be attached to and detached from the boom body regardless of the state of attachment to the boom body. For this reason, repair and maintenance of the internal structure of the telescopic boom can be easily performed, and the cost required for these operations can be reduced.

第２の本発明に係る作業車の伸縮ブームでは、油圧シリンダはそれ自体単独でブーム本体に結合されており、ライン状部材は油圧シリンダの上方領域を延びて設けられている。このためガイド部材がブーム本体内に取り付けられている状態では、ブーム伸縮シリンダはライン状部材のブーム本体への取り付け状態とは無関係にブーム本体に対する着脱が可能であり、同様にライン状部材はブーム伸縮シリンダのブーム本体への取り付け状態とは無関係にブーム本体に対する着脱が可能である。このため伸縮ブームの内部構造の修理やメンテナンスを容易に行うことができ、第１の本発明に係る作業車の伸縮ブームと同様の効果を得ることができる。また、この第２の本発明に係る作業車の伸縮ブームでは、油圧シリンダをブーム本体の内周下面に近接して設けることができるので、伸縮ブーム全体の重心を低くすることが可能である。 In the telescopic boom of the work vehicle according to the second aspect of the present invention, the hydraulic cylinder is itself connected to the boom body alone, and the line-shaped member is provided extending in the upper region of the hydraulic cylinder. For this reason, in a state where the guide member is mounted in the boom body, the boom telescopic cylinder can be attached to and detached from the boom body regardless of the state in which the line-shaped member is mounted on the boom body. The telescopic cylinder can be attached to and detached from the boom body regardless of the state of attachment to the boom body. For this reason, repair and maintenance of the internal structure of the telescopic boom can be easily performed, and the same effect as the telescopic boom of the work vehicle according to the first aspect of the present invention can be obtained. Further, in the telescopic boom of the work vehicle according to the second aspect of the present invention, since the hydraulic cylinder can be provided close to the inner peripheral lower surface of the boom body, the center of gravity of the entire telescopic boom can be lowered.

以下、図面を参照して本発明の好ましい実施形態について説明する。図１は本発明に係る伸縮ブームを備えた高所作業車１を示している。この高所作業車１は走行用車輪１１，１１，・・・を備えて運転キャビン１２から走行運転が可能なトラック式の走行体１０と、走行体１０上に設けられた旋回台２０に起伏動自在に取り付けられた伸縮ブーム３０と、伸縮ブーム３０の先端部に取り付けられた作業者搭乗用の作業台４０とを有して構成される。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an aerial work vehicle 1 equipped with a telescopic boom according to the present invention. This aerial work vehicle 1 is provided with traveling wheels 11,... That can be driven from a driving cabin 12, and a swivel base 20 provided on the traveling body 10 undulates. The telescopic boom 30 is movably attached, and the operator boarding work platform 40 is attached to the distal end of the telescopic boom 30.

旋回台２０は走行体１０の後部に上下軸まわり３６０度回動自在に取り付けられている。走行体１０の内部にはブーム旋回モータ（油圧モータ）５１が設けられており、このブーム旋回モータ５１を回転作動させることにより、図示しないギヤを介して旋回台２０を水平旋回させることができる。 The swivel base 20 is attached to the rear part of the traveling body 10 so as to be rotatable 360 degrees around the vertical axis. A boom turning motor (hydraulic motor) 51 is provided inside the traveling body 10, and the swivel base 20 can be horizontally turned via a gear (not shown) by rotating the boom turning motor 51.

伸縮ブーム３０は中空柱状で順次外径及び内径が小さくなる複数のブーム部材（後述するように第１ブーム３１ａ、第２ブーム３１ｂ、第３ブーム３１ｃ及び第４ブーム３１ｄ）が入れ子式に構成されており、その基端部が旋回台２０の支柱２１にフートピン２２を介して取り付けられている。伸縮ブーム３０の内部にはブーム伸縮シリンダ（油圧シリンダ）５２が設けられており、このブーム伸縮シリンダ５２を伸縮作動させることにより各ブーム部材を相対的に移動させて伸縮ブーム３０全体を軸方向に伸縮させることができる。伸縮ブーム３０と旋回台２０の支柱２１との間にはブーム起伏シリンダ（油圧シリンダ）５３が跨設されており、このブーム起伏シリンダ５３を伸縮作動させることにより伸縮ブーム３０全体を起伏させることができる。 The telescopic boom 30 has a hollow columnar shape, and a plurality of boom members (the first boom 31a, the second boom 31b, the third boom 31c, and the fourth boom 31d as will be described later) are configured to be nested. The base end portion is attached to the column 21 of the swivel base 20 via the foot pin 22. A boom telescopic cylinder (hydraulic cylinder) 52 is provided inside the telescopic boom 30. By operating the boom telescopic cylinder 52 to expand and contract, each boom member is moved relative to each other to move the entire telescopic boom 30 in the axial direction. Can be expanded and contracted. A boom hoisting cylinder (hydraulic cylinder) 53 is straddled between the telescopic boom 30 and the support column 21 of the swivel base 20. The boom hoisting cylinder 53 can be raised and lowered to raise and lower the entire telescopic boom 30. it can.

伸縮ブーム３０の（第４ブーム３１ｄの）先端部には垂直ポスト３８が上方に延びて設けられており、作業台４０はこの垂直ポスト３８の上端部に設けられた作業台支持プレート３９に対して水平旋回自在に取り付けられている。垂直ポスト３８は伸縮ブーム３０の先端部と作業台支持プレート３９との間に介装されたレベリングシリンダ（油圧シリンダ）５５の伸縮作動によって伸縮ブーム３０の姿勢によらず常時垂直姿勢が保持されるようになっており、これにより作業台４０の床面は常に水平姿勢が保たれるようになっている。なお、レベリングシリンダ５５の伸縮作動は、図示しない傾き角度検出器によって検出される作業台４０の水平姿勢からの傾き角度がほぼ零になるように制御装置（図示せず）によって自動制御される。 A vertical post 38 extends upward at the tip of the telescopic boom 30 (of the fourth boom 31 d), and the work table 40 is against a work table support plate 39 provided at the upper end of the vertical post 38. It is attached so that it can rotate horizontally. The vertical post 38 is always maintained in a vertical posture regardless of the posture of the telescopic boom 30 by the telescopic operation of a leveling cylinder (hydraulic cylinder) 55 interposed between the tip of the telescopic boom 30 and the worktable support plate 39. Thus, the floor surface of the work table 40 is always kept in a horizontal posture. The expansion / contraction operation of the leveling cylinder 55 is automatically controlled by a control device (not shown) so that the inclination angle from the horizontal posture of the work table 40 detected by an inclination angle detector (not shown) becomes substantially zero.

作業台４０は平板状の床部材４０ａ及びこの床部材４０ａの外周部に立設された手摺り４０ｂとから構成されており、作業台支持プレート３９内に設けられた作業台旋回モータ（油圧モータ）５４を回転作動させることによって床部材４０ａを作業台支持プレート３９に対して（すなわち垂直ポスト３８に対して）水平旋回させることができる。 The work table 40 is composed of a flat floor member 40a and a handrail 40b erected on the outer periphery of the floor member 40a, and a work table turning motor (hydraulic motor) provided in the work table support plate 39. ) 54 can be pivoted horizontally with respect to the platform support plate 39 (ie, with respect to the vertical post 38).

作業台４０には上部操作装置４１が設置されており、作業台４０に搭乗したオペレータ（作業者）ＯＰはこの上部操作装置４１に備えられたレバーやスイッチ等の操作手段の操作により伸縮ブーム３０の起伏、伸縮、旋回操作と作業台４０の水平旋回操作を行うことができ、自身の乗った作業台４０を自在に移動させて高所での作業を行うことが可能である。なお、図１に示すように走行体１０の前後左右計４箇所にはアウトリガジャッキ１３が設けられており、作業を始める前にこれらアウトリガジャッキ１３を接地させておくことにより走行体１０の安定度を高めることができる。 An upper operation device 41 is installed on the work table 40, and an operator (operator) OP who has boarded the work table 40 operates the telescopic boom 30 by operating operation means such as a lever and a switch provided in the upper operation device 41. Undulation, expansion / contraction, turning operation and horizontal turning operation of the work table 40 can be performed, and the work table 40 on which the user rides can be freely moved to perform work at a high place. As shown in FIG. 1, the outrigger jacks 13 are provided at four places in the front, rear, left, and right sides of the traveling body 10. Can be increased.

次に、図２〜図６を参照してこの高所作業車１に備えられた伸縮ブーム３０の第１実施形態について説明する。第１実施形態に係る伸縮ブーム３０は中空柱状で順次外径及び内径が小さくなる第１ブーム３１ａ、第２ブーム３１ｂ、第３ブーム３１ｃ及び第４ブーム３１ｄがこの順で入れ子式に構成されてなるブーム本体３１及び前述のブーム伸縮シリンダ５２のほか、ブーム本体３１の内部に設置されたガイド部材３２、ブーム本体３１の内部をその基端側（走行体１０側）から先端側（作業台４０側）へ延びて設けられたライン状部材３５及びこのライン状部材３５を保護する２つの保護案内部材（第１保護案内部材３６及び第２保護案内部材３７）を有して構成される。 Next, a first embodiment of the telescopic boom 30 provided in the aerial work vehicle 1 will be described with reference to FIGS. The telescopic boom 30 according to the first embodiment has a hollow columnar shape, and a first boom 31a, a second boom 31b, a third boom 31c, and a fourth boom 31d that are sequentially reduced in outer diameter and inner diameter are nested in this order. In addition to the boom main body 31 and the boom telescopic cylinder 52 described above, the guide member 32 installed inside the boom main body 31 and the interior of the boom main body 31 from the base end side (the traveling body 10 side) to the distal end side (work table 40). A line-shaped member 35 extending to the side) and two protective guide members (a first protective guide member 36 and a second protective guide member 37) for protecting the line-shaped member 35.

ブーム伸縮シリンダ５２はブーム本体３１の内部に、ブーム本体３１の軸線ＡＸと平行に延びて設けられている（図２参照）。ブーム伸縮シリンダ５２は、シリンダチューブ５２ａとこのシリンダチューブ５２ａに対して軸方向に相対移動自在なピストンロッド５２ｂからなっており、シリンダチューブ５２ａの端部（ブーム本体３１の基端側の端部）は枢支ピンＳ₁によって第２ブーム３１ｂに、またピストンロッド５２ｂの端部は枢支ピンＳ₂によって第１ブーム３１ａに取り付けられている。このためブーム伸縮シリンダ５２が伸縮作動すると第２ブーム３１ｂが第１ブーム３１ａから引き出され、ブーム伸縮シリンダ５２が収縮作動すると第２ブーム３１ｂが第１ブーム３１ａ内に格納される。 The boom telescopic cylinder 52 is provided in the boom body 31 so as to extend in parallel with the axis AX of the boom body 31 (see FIG. 2). The boom telescopic cylinder 52 is composed of a cylinder tube 52a and a piston rod 52b that can move relative to the cylinder tube 52a in the axial direction. The end of the cylinder tube 52a (the end on the base end side of the boom body 31). the second boom 31b by pivot pin S _1, also the end of the piston rod 52b is attached to the first boom 31a by pivot pin S _2. Therefore, when the boom telescopic cylinder 52 is expanded and contracted, the second boom 31b is pulled out from the first boom 31a, and when the boom telescopic cylinder 52 is contracted, the second boom 31b is stored in the first boom 31a.

図２に示すように、第２ブーム３１ｂに対する第３ブーム３１ｃの相対移動及び第３ブーム３１ｃに対する第４ブーム３１ｄの相対移動はプーリ・ワイヤ機構によりなされる。このプーリ・ワイヤ機構は、シリンダチューブ５２ａの先端部（或いは第２ブーム３１ｂの先端部）に取り付けられた第１プーリＰ₁及びこの第１プーリＰ₁に巻き掛けられて一端が第１ブーム３１ａの基端部に、他端が第３ブーム３１ｃの基端部に取り付けられた第１ワイヤＷ₁と、第３ブーム３１ｃの先端部に取り付けられた第２プーリＰ₂及びこの第２プーリＰ₂に巻き掛けられて一端が第２ブーム３１ｂの基端部に、他端が第４ブーム３１ｄの基端部に取り付けられた第２ワイヤＷ₂と、第２ブーム３１ｂの基端部に取り付けられた第３プーリＰ₃及びこの第３プーリＰ₃に巻き掛けられて一端が第３ブーム３１ｃの基端部に、他端が第１ブーム３１ａの先端部に取り付けられた第３ワイヤＷ₃と、第３ブーム３１ｃの基端部に取り付けられた第４プーリＰ₄及びこの第４プーリＰ₄に巻き掛けられて一端が第４ブーム３１ｄの基端部に、他端が第２ブーム３１ｂの先端部に取り付けられた第４ワイヤＷ₄とから構成される。なお、上記プーリ・ワイヤ機構はブーム本体３１の軸線ＡＸを挟んで左右対称となるように２組設けられる。また、図２における４つのプーリＰ₁，Ｐ₂，Ｐ₃，Ｐ₄のブーム本体３１に対する取り付け位置は図示の便宜上紙面の上下方向に並べて描いたに過ぎず、実際には第１プーリＰ₁及び第３プーリP₃はブーム伸縮シリンダ５２の側方に設けられ、第２プーリＰ₂は第１プーリＰ₁の側方に（第２プーリＰ₂の方が第１プーリＰ₁よりもブーム本体３１の先端側に位置する）、また第４プーリＰ₄は第３プーリＰ₃の側方にそれぞれ設けられる。 As shown in FIG. 2, the relative movement of the third boom 31c with respect to the second boom 31b and the relative movement of the fourth boom 31d with respect to the third boom 31c are performed by a pulley / wire mechanism. The pulley / wire mechanism includes a first pulley P ₁ attached to the distal end portion of the cylinder tube 52a (or the distal end portion of the second boom 31b) and the first pulley P ₁ wound around one end of the first boom 31a. The first wire W ₁ having the other end attached to the proximal end of the third boom 31c, the second pulley P ₂ attached to the distal end of the third boom 31c, and the second pulley P. the wound around one end to the ₂ base end portion of the second boom 31b, the second wire W ₂ of the other end attached to the proximal end of the fourth boom 31d, attached to the proximal end of the second boom 31b The third pulley P ₃ and the third wire W ₃ wound around the third pulley P ₃ and having one end attached to the proximal end portion of the third boom 31c and the other end attached to the distal end portion of the first boom 31a. And attached to the base end of the third boom 31c. And a fourth pulley P ₄ and wound around one end to the fourth pulley P ₄ is a proximal end portion of the fourth boom 31d, the fourth wire W ₄ the other end is attached to the distal end of the second boom 31b Consists of Two sets of the pulley / wire mechanisms are provided so as to be symmetrical with respect to the axis AX of the boom body 31. Further, the attachment positions of the four pulleys P ₁ , P ₂ , P ₃ , and P ₄ in FIG. 2 with respect to the boom body 31 are merely drawn side by side in the vertical direction of the drawing for convenience of illustration, and actually the first pulley P _1. And the third pulley P ₃ is provided on the side of the boom telescopic cylinder 52, and the second pulley P ₂ is on the side of the first pulley P ₁ (the second pulley P ₂ is boomed more than the first pulley P _1. The fourth pulley P ₄ is located on the side of the third pulley P ₃ .

図２（Ａ）に示すように、ブーム伸縮シリンダ５２が全縮状態にあるときにはブーム本体３１も全縮状態にある。この状態からブーム伸縮シリンダ５２が伸長作動すると第２ブーム３１ｂが第１ブーム３１ａから引き出され、これに伴って第３ブーム３１ｃが第１プーリＰ₁及び第１ワイヤＷ₁の作用によって第２ブーム３１ｂから引き出され、第４ブーム３１ｄが第２プーリＰ₂及び第２ワイヤＷ₂の作用によって第３ブーム３１ｃから引き出される（図２（Ｂ）参照）。また、この図２（Ｂ）に示す状態からブーム伸縮シリンダ５２が収縮作動すると第２ブーム３１ｂが第１ブーム３１ａ内に格納され、これに伴って第３ブーム３１ｃが第３プーリＰ₃及び第３ワイヤＷ₃の作用によって第２ブーム３１ｂ内に格納され、第４ブーム３１ｄが第４プーリＰ₄及び第４ワイヤＷ₄の作用によって第３ブーム３１ｃ内に格納される。 As shown in FIG. 2A, when the boom telescopic cylinder 52 is in the fully contracted state, the boom body 31 is also in the fully contracted state. When the boom telescopic cylinder 52 from this state is extended actuated second boom 31b is pulled out from the first boom 31a, the third boom 31c in association with this second boom by the first action of the pulley P ₁ and the first wire W ₁ drawn from 31b, the fourth boom 31d is pulled out from the second pulley P ₂ and the second third boom 31c by the action of the wire W ₂ (see FIG. 2 (B)). Also, when the boom telescopic cylinder 52 from the state shown in FIG. 2 (B) is contracted actuated second boom 31b is stored in the first boom 31a, the third boom 31c is a third pulley P ₃ and the connection with this 3 stored in the second boom 31b by the action of the wire W _3, 4th boom 31d is stored in the third boom in 31c by the action of the fourth pulley P ₄ and the fourth wire W _4.

ガイド部材３２は図３及び図４に示すように下方に開口した断面コの字形状の長尺状部材であり、一端側が第３ブーム３１ｃに枢支ピンＳ₃によって取り付けられてブーム伸縮シリンダ５２の下方に位置し、ブーム本体３１の軸線ＡＸとほぼ平行に延びるとともに、ブーム本体３１の（第４ブーム３１ｄの）内周下面上を転動するローラＲ₁を他端側に有している。なお、アーム３２ａはブーム本体３１の幅方向に二股に分かれて２本延びており、ローラＲ₁はこの二股に分かれた２本のアーム３２それぞれに取り付けられている（後述するように、２本のアーム３２ａが第２保護案内部材３７をその両側から跨ぐようにするため）。そして更に、このガイド部材３２の上面を、ブーム伸縮シリンダ５２の先端部に取り付けられたローラＲ₂が転動自在になっている。なお、このブーム伸縮シリンダ５２の先端部に取り付けられたローラＲ₂は、シリンダチューブ５２ａの先端側の下方撓みを抑えるとともに、ブーム伸縮シリンダ５２の自重の一部を支持することにより枢支ピンＳ₁の過重負担を軽減する役割を果たしている。 Guide members 32 are elongated member shaped opening cross section co downward as shown in FIGS. 3 and 4, the boom telescopic cylinder 52 one end attached by pivot pin S ₃ to the third boom 31c And has a roller R ₁ on the other end side that rolls substantially parallel to the axis AX of the boom body 31 and rolls on the lower surface of the inner periphery (of the fourth boom 31d) of the boom body 31. . Incidentally, the arms 32a extend two bifurcated in the width direction of the base boom 31, the roller R ₁ is as two attached to the arm 32 each are (to be described later which was divided into the fork, two So that the arm 32a extends over the second protective guide member 37 from both sides). Furthermore, a roller R ₂ attached to the tip of the boom telescopic cylinder 52 can roll on the upper surface of the guide member 32. The roller R ₂ attached to the distal end portion of the boom telescopic cylinder 52 suppresses the downward deflection of the distal end side of the cylinder tube 52 a and supports a part of the weight of the boom telescopic cylinder 52 to support the pivot pin S. _It plays a role in reducing the overload of ₁ .

ライン状部材３５はブーム本体３１の基端側（走行体側）から先端側（作業台４０側）に各種信号を送信するための信号伝送ケーブルや作業台旋回モータ５４は作業台４０上で使用する油圧機器等に圧油を供給するための送油ホースなどからなっており、２つの保護案内部材（第１保護案内部材３６及び第２保護案内部材３７）により保護された状態で、ブーム伸縮シリンダ５２の下方領域を延びて設けられている。 The line-shaped member 35 uses a signal transmission cable for transmitting various signals from the base end side (traveling body side) of the boom body 31 to the distal end side (working table 40 side) and the worktable turning motor 54 on the worktable 40. The boom telescopic cylinder includes an oil feeding hose for supplying pressure oil to a hydraulic device or the like and is protected by two protective guide members (first protective guide member 36 and second protective guide member 37). 52 is provided extending in the lower region.

ライン状部材３５を保護する２つの保護案内部材、すなわち第１保護案内部材３６及び第２保護案内部材３７はライン状部材３５を衝撃等から保護するとともに、ブーム本体３１の伸縮に伴ってライン状部材３５がブーム本体３１内を整然と移動するようにこれを案内する働きをする。これら両保護案内部材３６，３７は図５に示すように中空矩形断面形状のリンク部材Ｌが結合ピンＣにより連続的に結合された構成を有しており、ライン状部材３５はこれらリンク部材Ｌの内部空間内を延びて設けられている。 Two protective guide members for protecting the line-shaped member 35, that is, the first protective guide member 36 and the second protective guide member 37 protect the line-shaped member 35 from an impact and the like, and in line with the expansion and contraction of the boom body 31. The member 35 serves to guide the member 35 so that the member 35 moves in an orderly manner. These protective guide members 36 and 37 have a structure in which a link member L having a hollow rectangular cross section is continuously coupled by a coupling pin C as shown in FIG. It extends in the interior space.

第１保護案内部材３６は、一端部（ライン状部材３５に沿った走行体１０側の端部３６ａ）が第１ブーム３１ａの内周下部に取り付けられてブーム本体３１内をその基端側に延びた後、上方に反転してブーム本体３１の先端側に延び（反転部を符号３６ｃとして示す）、他端部（ライン状部材３５に沿った作業台４０側の端部３６ｂ）がガイド部材３２におけるブーム本体３１の基端側の端部に（或いは第３ブーム３１ｃであってもよい。但しガイド部材３２よりも下方の領域に）取り付けられている。また第２保護案内部材３７は、一端部（ライン状部材３５に沿った走行体１０側の端部３７ａ）がガイド部材３２の先端側に取り付けられてブーム本体３１内をその基端側に延びた後、下方に反転してブーム本体３１の先端側に延び（反転部を符号３７ｃとして示す）、他端部（ライン状部材３５に沿った作業台４０側の端部３７ｂ）が第４ブーム３１ｄの内周下部に取り付けられている。 The first protection guide member 36 has one end portion (an end portion 36a on the traveling body 10 side along the line-shaped member 35) attached to the lower portion of the inner periphery of the first boom 31a so that the inside of the boom main body 31 is on the proximal end side. After extending, it is inverted upward and extends to the tip side of the boom body 31 (the reversing part is indicated by reference numeral 36c), and the other end (the end part 36b on the work table 40 side along the line-shaped member 35) is the guide member. 32 is attached to the end of the boom main body 31 on the base end side (or the third boom 31c, but in a region below the guide member 32). The second protection guide member 37 has one end (the end 37a on the traveling body 10 side along the line-shaped member 35) attached to the distal end side of the guide member 32 and extends in the boom body 31 to the proximal end side. Then, it reverses downward and extends to the tip end side of the boom body 31 (the reversing portion is indicated by reference numeral 37c), and the other end portion (the end portion 37b on the work table 40 side along the line-shaped member 35) is the fourth boom. It is attached to the inner peripheral lower part of 31d.

ライン状部材３５は第１保護案内部材３６及び第２保護案内部材３７それぞれに対して固定されており、ブーム本体３１が伸縮して第１保護案内部材３６及び第２保護案内部材３７が変形するときにはライン状部材３５もこれら両保護案内部材３６，３７と一体となって変形するようになっている。ライン状部材３５のうち第１保護案内部材３６よりも走行体１０側に位置する部分３５ａは第１保護案内部材３６の両側部を延びるように配置された状態で第１ブーム３１ａの内周下面に固定されており、第２保護案内部材３７よりも作業台４０側に位置する部分３５ｂは第４ブーム３１ｄの内周下面に固定されている。また、ライン状部材３５のうち第１保護案内部材３６と第２保護案内部材３７との間の部分３５ｃは、図３、図６及び図４に示すようにガイド部材３２の左右の側壁３２ｂに設けられた穴３２ｃ，３２ｄから側壁３２ｂの外方を延びてここに（側壁３２ｂに）固定されている。なお、第２保護案内部材３７及びライン状部材３５のうち第２保護案内部材３７よりも作業台４０側に位置する部分３５ｂは２つのローラＲ₁の間を延びて（すなわち２本のアーム３２ａが第２保護案内部材３７及びライン状部材３５を跨ぐように）設けられる。これにより第４ブーム３１ｄの内周下面におけるガイド部材３２の２つのローラＲ₁の転動路が確保される。 The line-shaped member 35 is fixed to each of the first protection guide member 36 and the second protection guide member 37, and the boom main body 31 expands and contracts to deform the first protection guide member 36 and the second protection guide member 37. In some cases, the line-shaped member 35 is also deformed integrally with these protective guide members 36 and 37. A portion 35a of the line-shaped member 35 located closer to the traveling body 10 than the first protection guide member 36 is disposed so as to extend on both sides of the first protection guide member 36, and the inner peripheral lower surface of the first boom 31a. The portion 35b located closer to the work table 40 than the second protection guide member 37 is fixed to the inner peripheral lower surface of the fourth boom 31d. Further, a portion 35c between the first protection guide member 36 and the second protection guide member 37 in the line-shaped member 35 is formed on the left and right side walls 32b of the guide member 32 as shown in FIGS. The outside of the side wall 32b extends from the provided holes 32c and 32d and is fixed here (to the side wall 32b). The portion 35b which is located on the work table 40 side of the second protective guide members 37 of the second protective guide members 37 and the linear member 35 extends between the two rollers R ₁ (i.e. two arms 32a Is provided across the second protection guide member 37 and the line-shaped member 35). This two rollers R ₁ rolling path of the guide member 32 in the inner peripheral lower surface of the fourth boom 31d is ensured by.

ここで、ブーム本体３１が全縮の状態（図３参照）から伸縮シリンダ５２を伸長作動させると、第２ブーム３１ｂは第１ブーム３１ａに対して、第３ブーム３１ｃは第２ブーム３１ｂに対して、また第４ブーム３１ｄは第３ブーム３１ｃに対してそれぞれ相対移動してブーム本体３１全体が伸長する（図６参照）。このときガイド部材３２のローラＲ₁は第４ブーム３１ｄの内周下面上を転動するので、ガイド部材３２はブーム本体３１の軸線ＡＸに対する平行姿勢が維持される。また、ブーム伸縮シリンダ５２のローラＲ₂はこのガイド部材３２の上面を転動するのでブーム伸縮シリンダ５２もブーム本体３１の軸線ＡＸに対する平行姿勢が維持される。第１保護案内部材３６の端部３６ｂと第２保護案内部材３７の端部３７ａとはブーム本体３１の伸長によってそれぞれ第１ブーム３１ａから離れる方向に移動するが、これら２つの端部３６ｂ，３７ａはともに第３ブーム３１ｃに対して固定された状態となっているので、２つの端部３６ｂ，３７ａの相対位置は変化しない。 Here, when the telescopic cylinder 52 is extended from the fully contracted state (see FIG. 3), the second boom 31b is relative to the first boom 31a, and the third boom 31c is relative to the second boom 31b. In addition, the fourth boom 31d moves relative to the third boom 31c, and the entire boom body 31 extends (see FIG. 6). At this time the roller R ₁ of the guide member 32 rolls on the inner peripheral lower surface of the fourth boom 31d, the guide member 32 is parallel orientation relative to the axis AX of the boom assembly 31 is maintained. Further, since the roller R ₂ of the boom telescopic cylinder 52 rolls on the upper surface of the guide member 32, the boom telescopic cylinder 52 is also maintained in a parallel posture with respect to the axis AX of the boom body 31. The end portion 36b of the first protection guide member 36 and the end portion 37a of the second protection guide member 37 are moved away from the first boom 31a by the extension of the boom body 31, respectively, but these two end portions 36b, 37a are moved. Since both are fixed to the third boom 31c, the relative positions of the two end portions 36b and 37a do not change.

このように第１実施形態における伸縮ブーム３０では、ブーム伸縮シリンダ５２はそれ自体単独で（２つの枢支ピンＳ₁，Ｓ₂によって）ブーム本体３１に結合されており、ライン状部材３５は２つの保護案内部材（第１保護案内部材３６及び第２保護案内部材３７）により保護された状態でブーム伸縮シリンダ５２の下方領域を延びて設けられている。このためガイド部材３２がブーム本体３１内に取り付けられている状態では、ブーム伸縮シリンダ５２はライン状部材３５のブーム本体３１への取り付け状態とは無関係にブーム本体３１に対する着脱が可能であり、同様にライン状部材３５はブーム伸縮シリンダ５２のブーム本体３１への取り付け状態とは無関係にブーム本体３１に対する着脱が可能である。このため伸縮ブーム３０の内部構造の修理やメンテナンスを容易に行うことができ、これらの作業に要するコストを低減することが可能である。 As described above, in the telescopic boom 30 in the first embodiment, the boom telescopic cylinder 52 is connected to the boom body 31 by itself (by the two pivot pins S ₁ and S ₂ ), and the line-shaped member 35 is 2 in number. A lower region of the boom telescopic cylinder 52 is provided so as to be protected by two protective guide members (the first protective guide member 36 and the second protective guide member 37). For this reason, in the state where the guide member 32 is attached in the boom main body 31, the boom telescopic cylinder 52 can be attached to and detached from the boom main body 31 irrespective of the attachment state of the line-shaped member 35 to the boom main body 31. In addition, the line-shaped member 35 can be attached to and detached from the boom body 31 regardless of the state in which the boom telescopic cylinder 52 is attached to the boom body 31. For this reason, repair and maintenance of the internal structure of the telescopic boom 30 can be easily performed, and the cost required for these operations can be reduced.

続いて、図７〜図９を参照して第２実施形態に係る伸縮ブーム１３０について説明する。第２実施形態に係る伸縮ブーム１３０は第１実施形態と同じ構成を有するブーム本体３１、ブーム伸縮シリンダ５２、ライン状部材１３５のほか、ライン状部材１３５を保護する２つの保護案内部材（第１保護案内部材１３６及び第２保護案内部材１３７）、ブーム本体３１の内部に設置された第１ガイド部材１３２及び第２ガイド部材１３３を有して構成される。 Next, the telescopic boom 130 according to the second embodiment will be described with reference to FIGS. The telescopic boom 130 according to the second embodiment includes, in addition to the boom main body 31, the boom telescopic cylinder 52, and the line-shaped member 135 having the same configuration as the first embodiment, two protective guide members (first for protecting the line-shaped member 135. A protection guide member 136 and a second protection guide member 137), and a first guide member 132 and a second guide member 133 installed inside the boom body 31.

ブーム伸縮シリンダ５２は第１実施形態の場合と同様、ブーム本体３１の内部に、ブーム本体３１の軸線ＡＸとほぼ平行に延びるように取り付けられるが、第１実施形態の場合とは異なり、ブーム伸縮シリンダ５２の下方領域には何も設けられないため、ブーム伸縮シリンダ５２はブーム本体３１の内周下面に近接して設けることができる（図７参照）。この第２実施形態でもブーム伸縮シリンダ５２はシリンダチューブ５２ａの端部（ブーム本体３１の基端側の端部）が枢支ピンＳ₁によって第２ブーム３１ｂに、またピストンロッド５２ｂの端部が枢支ピンＳ₂によって第１ブーム３１ａに取り付けられる。このためブーム伸縮シリンダ５２が伸縮作動すると第２ブーム３１ｂが第１ブーム３１ａに対して相対移動することとなり、第２ブーム３１ｂが第１ブーム３１ａから引き出されるのは第１実施形態の場合と同じである。また、ブーム伸縮シリンダ５２の先端部に設けられたローラＲ₂は第４ブーム３１ｄ及び第３ブーム３１ｃの内周下面上を転動自在になっており、第１実施形態の場合と同様に、シリンダチューブ５２ａの先端側の下方撓みを抑えるとともに、ブーム伸縮シリンダ５２の自重の一部を支持することにより枢支ピンＳ₁の過重負担を軽減することができるようになっている。また、第２ブーム３１ｂに対する第３ブーム３１ｃの相対移動及び第３ブーム３１ｃに対する第４ブーム３１ｄの相対移動はプーリ・ワイヤ機構によりなされるのも第１実施形態の場合と同様であり、その構成も第１実施形態の場合と同じであるのでその説明は省略する。 The boom telescopic cylinder 52 is attached to the inside of the boom main body 31 so as to extend substantially parallel to the axis AX of the boom main body 31 as in the case of the first embodiment. Since nothing is provided in the lower region of the cylinder 52, the boom telescopic cylinder 52 can be provided close to the inner peripheral lower surface of the boom body 31 (see FIG. 7). The end (end portion on the base end side of the boom assembly 31) is pivot pin S ₁ of this boom telescopic cylinder 52 the second embodiment the cylinder tube 52a to the second boom 31b, also the end of the piston rod 52b is by pivot pin S ₂ is attached to the first boom 31a. For this reason, when the boom telescopic cylinder 52 is expanded and contracted, the second boom 31b moves relative to the first boom 31a, and the second boom 31b is pulled out from the first boom 31a as in the first embodiment. It is. The roller R ₂ provided at the distal end of the boom telescopic cylinder 52 has become freely roll on the inner peripheral lower surface of the fourth boom 31d and the third boom 31c, as in the first embodiment, suppresses deflection distal end side of the lower cylinder tube 52a, and is capable of reducing the overburdened the pivot pin S ₁ by supporting the part of the self-weight of the boom telescopic cylinder 52. Further, the relative movement of the third boom 31c with respect to the second boom 31b and the relative movement of the fourth boom 31d with respect to the third boom 31c are performed by the pulley / wire mechanism as in the case of the first embodiment. Since this is the same as in the first embodiment, the description thereof is omitted.

第１ガイド部材１３２は図７及び図８に示すように上方に開口した断面コの字形状の長尺状部材であり、一端側が第３ブーム３１ｃに枢支ピンＳ₃によって取り付けられてブーム伸縮シリンダ５２の上方に位置し、ブーム本体３１の軸線ＡＸとほぼ平行に延びるとともに、第４ブーム３１ｄの内周下面上を転動するローラＲ₁を他端側に有している。但し、ローラＲ₁を支持するアーム１３２ａは、必ずしも第１実施形態の場合のように二股にする必要はない。第２ガイド部材１３３も第１ガイド部材１３２と同様に上方に開口した断面コの字形状の長尺状部材であるが（図７及び図８参照）、第１ガイド部材１３２を下方から支持し得るように、第１ガイド部材１３２よりもひと回り大きいサイズを有している。そして、一端側の端部が第２ブーム３１ｂに枢支ピンＳ₄によって取り付けられてブーム伸縮シリンダ５２の上方に位置し、ブーム本体３１の軸線ＡＸと略平行に延びるとともに、他端側に設けられて上方に延びる係止部１３３ａを、第１ガイド部材１３２の両側に上方に延びて設けられたサイド部１３２ｂ（図８参照）に係止させている。 The first guide member 132 is an elongated member shaped opening cross section co upward as shown in FIGS. 7 and 8, one end attached by pivot pin S ₃ to the third boom 31c boom telescoping The roller R ₁ is located above the cylinder 52 and extends substantially parallel to the axis AX of the boom body 31 and rolls on the lower surface of the inner periphery of the fourth boom 31d on the other end side. However, the arm 132a supporting the roller R ₁ may not necessarily be bifurcated, as in the first embodiment. Similarly to the first guide member 132, the second guide member 133 is a long member having a U-shaped cross section that opens upward (see FIGS. 7 and 8), but supports the first guide member 132 from below. As a result, the first guide member 132 has a size slightly larger than that of the first guide member 132. The end portion of the one end attached by pivot pin S ₄ to the second boom 31b located above the boom telescopic cylinder 52, extends substantially parallel to the axis AX of the boom body 31, provided on the other end The locking portion 133a that extends upward is locked to a side portion 132b (see FIG. 8) that extends upward on both sides of the first guide member 132.

ライン状部材１３５の構成は第１実施形態のライン状部材３５と同じであるが、本実施形態では、２つの保護案内部材（第１保護案内部材１３６及び第２保護案内部材１３７）により保護された状態で、ブーム伸縮シリンダ５２の上方領域を延びて設けられている。 The configuration of the line-shaped member 135 is the same as that of the line-shaped member 35 of the first embodiment. However, in this embodiment, the line-shaped member 135 is protected by two protective guide members (a first protective guide member 136 and a second protective guide member 137). In this state, the upper region of the boom telescopic cylinder 52 extends.

第１保護案内部材１３６は、一端部（ライン状部材１３５に沿った走行体１０側の端部１３６ａ）が第１ブーム３１ａの先端側内周上部に取り付けられてブーム本体３１内をその基端側に延びた後、下方に反転してブーム本体３１の先端側に延び（反転部を符号１３６ｃとして示す）、他端部（ライン状部材１３５に沿った作業台４０側の端部１３６ｂ）が第１ガイド部材１３２の上面側に（第３ブーム３１ｃであってもよい。但し第１ガイド部材１３２よりも上方の領域に）取り付けられている。また、第２保護案内部材１３７は、一端部（ライン状部材１３５に沿った走行体１０側の端部１３７ａ）が第１ガイド部材１３２の先端側上面に取り付けられてブーム本体３１内をその基端側に延びた後、上方に反転してブーム本体３１の先端側に延び（反転部を符号１３７ｃとして示す）、他端部（ライン状部材１３５に沿った作業台４０側の端部１３７ｂ）が第４ブーム３１ｄの内周上部に取り付けられている。 The first protection guide member 136 has one end portion (the end portion 136a on the traveling body 10 side along the line-shaped member 135) attached to the top inner peripheral upper portion of the first boom 31a, and the inside of the boom main body 31 is its base end. And the other end (the end portion 136b on the work table 40 side along the line-shaped member 135) is extended to the front end side of the boom body 31 (the reversing portion is indicated by reference numeral 136c). It is attached to the upper surface side of the first guide member 132 (may be the third boom 31c, but in a region above the first guide member 132). The second protective guide member 137 has one end (the end 137a on the traveling body 10 side along the line-shaped member 135) attached to the upper surface on the distal end side of the first guide member 132 so that the inside of the boom main body 31 is in its base. After extending to the end side, it is inverted upward and extends to the tip side of the boom body 31 (the reversing part is indicated by reference numeral 137c), and the other end (the end part 137b on the work table 40 side along the line-shaped member 135). Is attached to the upper part of the inner periphery of the fourth boom 31d.

ライン状部材１３５は第１保護案内部材１３６及び第２保護案内部材１３７それぞれに対して固定されており、ブーム本体３１が伸縮して第１保護案内部材１３６及び第２保護案内部材１３７が変形するときにはライン状部材１３５もこれら両保護案内部材１３６，１３７と一体となって変形するようになっているのは第１実施形態の場合と同じである。また、ライン状部材１３５のうち第１保護案内部材１３６よりも走行体１０側に位置する部分１３５ａは第１保護案内部材１３６の両側部を延びるように配置された状態で第１ブーム３１ａの内周上面に固定されており、第２保護案内部材１３７よりも作業台４０側に位置する部分１３５ｂは第２保護案内部材１３７の先端より延びるように配置された状態で第４ブーム３１ｄの内周上面に固定されている。また、第１保護案部材１３６と第２保護案内部材１３７との間の部分１３５ｃは第２保護案内部材１３７の両側部を延びるように配置されている(図８参照)。 The line-shaped member 135 is fixed to the first protection guide member 136 and the second protection guide member 137, respectively, and the boom main body 31 expands and contracts to deform the first protection guide member 136 and the second protection guide member 137. In some cases, the line-shaped member 135 is deformed integrally with the protective guide members 136 and 137 as in the case of the first embodiment. Further, a portion 135a of the line-shaped member 135 that is located closer to the traveling body 10 than the first protection guide member 136 is disposed so as to extend on both sides of the first protection guide member 136. A portion 135b that is fixed to the circumferential upper surface and is located closer to the work table 40 than the second protective guide member 137 is disposed so as to extend from the tip of the second protective guide member 137, and the inner periphery of the fourth boom 31d. It is fixed on the top surface. Further, a portion 135c between the first protection plan member 136 and the second protection guide member 137 is disposed so as to extend on both sides of the second protection guide member 137 (see FIG. 8).

ここで、ブーム本体３１が全縮の状態（図７参照）から伸縮シリンダ５２を伸長作動させると、第２ブーム３１ｂは第１ブーム３１ａに対して、第３ブーム３１ｃは第２ブーム３１ｂに対して、また第４ブーム３１ｄは第３ブーム３１ｃに対してそれぞれ相対移動してブーム本体３１全体が伸長する（図９参照）。このときブーム伸縮シリンダ５２のローラＲ₂は第４ブーム３１ｄ及び第３ブーム３１ｃの内周下面上を転動するので、ブーム伸縮シリンダ５２はブーム本体３１の軸線ＡＸに対する平行姿勢が維持される。また、ガイド部材１３２もローラＲ₁が第４ブーム３１ｄの内周下面上を転動することによってブーム本体３１の軸線ＡＸに対する平行姿勢が維持される。第１保護案内部材１３６の端部１３６ｂと第２保護案内部材１３７の端部１３７ａとはブーム本体３１の伸長によってそれぞれ第１ブーム３１ａから離れる方向に移動するが、これら２つの端部１３６ｂ，１３７ａはともに第３ブーム３１ｃに対して固定された状態となっているので、２つの端部１３６ｂ，１３７ａの相対位置は変化しない。 Here, when the telescopic cylinder 52 is extended from the fully contracted state of the boom body 31 (see FIG. 7), the second boom 31b is relative to the first boom 31a, and the third boom 31c is relative to the second boom 31b. Also, the fourth boom 31d moves relative to the third boom 31c, respectively, and the entire boom body 31 extends (see FIG. 9). Since the roller R ₂ boom telescopic cylinder 52 at this time is rolling on the inner peripheral lower surface of the fourth boom 31d and the third boom 31c, the boom telescopic cylinder 52 is parallel orientation relative to the axis AX of the boom assembly 31 is maintained. The guide member 132 also roller R ₁ parallel posture is maintained with respect to the axis AX of the boom assembly 31 by rolling on the inner peripheral lower surface of the fourth boom 31d. The end portion 136b of the first protection guide member 136 and the end portion 137a of the second protection guide member 137 move away from the first boom 31a by extension of the boom main body 31, respectively, but these two end portions 136b and 137a are moved. Since both are fixed to the third boom 31c, the relative positions of the two end portions 136b and 137a do not change.

また、第１ガイド部材１３２と第２ガイド部材１３３とはブーム本体３１の軸線ＡＸ方向に相対移動するが、第２ガイド部材１３３の係止部１３３ａは第１ガイド部材１３２のサイド部１３２ｂに対してスライド移動できるため、第２ガイド部材１３３もブーム本体３１の軸線ＡＸに対する平行姿勢が維持される。そして、第１保護案内部材１３６はこの第２ガイド部材１３３の上面において支持されるため、ブーム本体３１の伸長によって第１保護案内部材１３６の中間部が下方に弛んできても、これがブーム伸縮シリンダ５２と接触することはない。 Further, the first guide member 132 and the second guide member 133 move relative to each other in the direction of the axis AX of the boom body 31, but the locking portion 133 a of the second guide member 133 is relative to the side portion 132 b of the first guide member 132. Therefore, the second guide member 133 is also maintained in a parallel posture with respect to the axis AX of the boom body 31. Since the first protection guide member 136 is supported on the upper surface of the second guide member 133, even if the middle part of the first protection guide member 136 can be slackened downward due to the extension of the boom body 31, this is the boom extension cylinder. No contact with 52.

上記のように第２実施形態に係る伸縮ブーム１３０では、ブーム伸縮シリンダ５２はそれ自体単独で（２つの枢支ピンＳ₁，Ｓ₂によって）ブーム本体３１に結合されており、また、ライン状部材１３５は２つの保護案内部材（第１保護案内部材１３６及び第２保護案内部材１３７）により保護された状態でブーム伸縮シリンダ５２の上方領域を延びて設けられている。このため第１ガイド部材１３２がブーム本体３１内に取り付けられている状態では、ブーム伸縮シリンダ５２はライン状部材１３５のブーム本体３１への取り付け状態とは無関係にブーム本体３１に対する着脱が可能であり、同様にライン状部材１３５はブーム伸縮シリンダ５２のブーム本体３１への取り付け状態とは無関係にブーム本体３１に対する着脱が可能である。このため伸縮ブーム１３０の内部構造の修理やメンテナンスを容易に行うことができ、第１実施形態と同様の効果を得ることができる。また、この第２実施形態に係る伸縮ブーム１３０では、ブーム伸縮シリンダ５２をブーム本体３１の内周下面に近接して設けることができるので、伸縮ブーム１３０全体の重心を低くすることが可能である。なお、上述の実施形態において示した第２ガイド部材１３７は第１保護案内部材１３６の下方への弛みを支えてこれがブーム伸縮シリンダ５２に接触しないようにするためのものであるので、他の手段によって弛みを抑えることができるような場合には不要となる。 As described above, in the telescopic boom 130 according to the second embodiment, the boom telescopic cylinder 52 itself is coupled to the boom body 31 by itself (by the two pivot pins S ₁ and S ₂ ), and is linear. The member 135 is provided extending in the upper region of the boom telescopic cylinder 52 while being protected by two protective guide members (a first protective guide member 136 and a second protective guide member 137). For this reason, in a state where the first guide member 132 is attached in the boom body 31, the boom telescopic cylinder 52 can be attached to and detached from the boom body 31 regardless of the state in which the line-shaped member 135 is attached to the boom body 31. Similarly, the line-shaped member 135 can be attached to and detached from the boom body 31 regardless of the state in which the boom telescopic cylinder 52 is attached to the boom body 31. For this reason, repair and maintenance of the internal structure of the telescopic boom 130 can be easily performed, and the same effect as the first embodiment can be obtained. Further, in the telescopic boom 130 according to the second embodiment, the boom telescopic cylinder 52 can be provided close to the inner peripheral lower surface of the boom main body 31, so that the center of gravity of the entire telescopic boom 130 can be lowered. . The second guide member 137 shown in the above-described embodiment is for supporting the downward slack of the first protective guide member 136 so that it does not come into contact with the boom telescopic cylinder 52. This is not necessary when the slack can be suppressed by.

これまで本発明の好ましい実施形態について説明してきたが、本発明の範囲は上述の実施形態に示したものに限定されない。例えば、上述の第１実施形態において示したライン状部材３５の配置は一例に過ぎず、ブーム伸縮シリンダ５２の下方領域を延びて設けられているのであれば、その配置形態は（第１保護案内部材３６や第２保護案内部材３７などの保護案内部材が必要か否か、必要とするならばその設置形態をどのようにするかなども含めて）任意である。また、上述の第２実施形態において示したライン状部材１３５の配置も一例であり、ブーム伸縮シリンダ５２の上方領域を延びて設けられているのであれば、その配置形態は（第１保護案内部材１３６や第２保護案内部材１３７などの保護案内部材が必要か否か、必要とするならばその設置形態をどのようにするかなども含めて）任意である。また、上述の２つの実施形態では、ブーム伸縮シリンダ５２はシリンダチューブ５２ａが第２ブーム３１ｂに取り付けられ、ピストンロッド５２ｂが第１ブーム３１ａに取り付けられる構成であったが、これらを逆にし、シリンダチューブ５２ａが第１ブーム３１ａに取り付けられ、ピストンロッド５２ｂが第２ブーム３１ｂに取り付けられる構成とすることも可能である。 The preferred embodiments of the present invention have been described so far, but the scope of the present invention is not limited to those shown in the above-described embodiments. For example, the arrangement of the line-shaped members 35 shown in the first embodiment described above is merely an example, and the arrangement form is (first protection guide) as long as the lower area of the boom telescopic cylinder 52 is provided. It is optional (including whether or not a protective guide member such as the member 36 or the second protective guide member 37 is necessary, and how to install it if necessary). Further, the arrangement of the line-shaped member 135 shown in the above-described second embodiment is also an example. If the line-shaped member 135 is provided so as to extend above the boom telescopic cylinder 52, the arrangement form is (first protective guide member). It is optional (including whether or not a protective guide member such as 136 or the second protective guide member 137 is necessary, and how to install it if necessary). In the above-described two embodiments, the boom telescopic cylinder 52 has a configuration in which the cylinder tube 52a is attached to the second boom 31b and the piston rod 52b is attached to the first boom 31a. It is also possible to adopt a configuration in which the tube 52a is attached to the first boom 31a and the piston rod 52b is attached to the second boom 31b.

また、上述の２つの実施形態において示した、第４ブーム３１ｄの内周下面上を転動するローラＲ₁は、第４ブーム３１ｄの内周下面上を摺動する摺動部材（スライダなど）に替えることが可能である。また、上述の実施形態では、本発明が適用される伸縮ブームは入れ子式に構成されるブーム部材が４つである４段ブームであったが、４段よりも多い段数を有する伸縮ブームについても応用することが可能である。例えば、４段よりも多い段数を有する伸縮ブームにおける中間の４つの隣接したブーム部材について本発明を適用することもできる。また、上述の実施形態では本発明が適用される作業車が伸縮ブームの先端部に作業台を備える高所作業車であったが、本発明は伸縮ブームの先端部に懸吊装置を備えたクレーン車やアースオーガを備えた穴掘り建柱車等にも同様に適用することが可能である。 In addition, the roller R ₁ that rolls on the inner peripheral lower surface of the fourth boom 31d shown in the two embodiments described above is a sliding member (slider or the like) that slides on the inner peripheral lower surface of the fourth boom 31d. It is possible to change to. In the above-described embodiment, the telescopic boom to which the present invention is applied is a four-stage boom having four boom members that are telescopic. However, the telescopic boom having more than four stages is also applicable. It is possible to apply. For example, the present invention can also be applied to four adjacent boom members in the middle of a telescopic boom having more than four stages. In the above-described embodiment, the work vehicle to which the present invention is applied is an aerial work vehicle having a workbench at the distal end of the telescopic boom, but the present invention includes a suspension device at the distal end of the telescopic boom. The present invention can be similarly applied to a digging pillar car equipped with a crane car or an earth auger.

本発明に係る伸縮ブームを備えた高所作業車の側面図である。It is a side view of the aerial work vehicle provided with the telescopic boom which concerns on this invention. 上記伸縮ブームを構成するブーム本体の伸縮機構であるプーリ・ワイヤ機構の構成を示す伸縮ブームの模式的断面図である。It is typical sectional drawing of the expansion-contraction boom which shows the structure of the pulley wire mechanism which is the expansion-contraction mechanism of the boom main body which comprises the said expansion-contraction boom. 第１実施形態に係る伸縮ブームの断面図（全縮時）である。It is sectional drawing (at the time of full contraction) of the telescopic boom which concerns on 1st Embodiment. 図３における矢視IV−IVから見た断面図である。It is sectional drawing seen from arrow IV-IV in FIG. 第１保護案内部材及び第２保護案内部材の構成の一部を示す斜視図である。It is a perspective view which shows a part of structure of a 1st protection guide member and a 2nd protection guide member. 第１実施形態に係る伸縮ブームの断面図（全伸時）である。It is sectional drawing (at the time of full extension) of the telescopic boom which concerns on 1st Embodiment. 第２実施形態に係る伸縮ブームの断面図（全縮時）である。It is sectional drawing (at the time of full contraction) of the telescopic boom which concerns on 2nd Embodiment. 図７における矢視VIII−VIIIから見た断面図である。It is sectional drawing seen from the arrow VIII-VIII in FIG. 第２実施形態に係る伸縮ブームの断面図（全伸時）である。It is sectional drawing (at the time of full extension) of the telescopic boom which concerns on 2nd Embodiment.

Explanation of symbols

１高所作業車（作業車）
１０走行体
３０伸縮ブーム
３１ブーム本体
３１ａ第１ブーム
３１ｂ第２ブーム
３１ｃ第３ブーム
３１ｄ第４ブーム
３２ガイド部材
３５ライン状部材
３６第１保護案内部材
３７第２保護案内部材
４０作業台（作業機）
５２ブーム伸縮シリンダ（油圧シリンダ）
５２ａシリンダチューブ
５２ｂピストンロッド
１３０伸縮ブーム
１３２第１ガイド部材（ガイド部材）
１３３第２ガイド部材
１３５ライン状部材
１３６第１保護案内部材
１３７第２保護案内部材 1 High-altitude work vehicle (work vehicle)
DESCRIPTION OF SYMBOLS 10 Traveling body 30 Telescopic boom 31 Boom main body 31a 1st boom 31b 2nd boom 31c 3rd boom 31d 4th boom 32 Guide member 35 Line-shaped member 36 1st protection guide member 37 2nd protection guide member 40 Work table (work machine) )
52 Boom telescopic cylinder (hydraulic cylinder)
52a Cylinder tube 52b Piston rod 130 Telescopic boom 132 First guide member (guide member)
133 Second guide member 135 Line-shaped member 136 First protection guide member 137 Second protection guide member

Claims

A telescopic boom of a work vehicle that is attached to a traveling body so as to freely move up and down, and has a work machine at a tip part,
A boom body in which a first boom, a second boom, a third boom, and a fourth boom are configured to be nested in this order, and a base end portion of the first boom is attached to the traveling body;
The cylinder tube and a piston rod that is movable relative to the cylinder tube in the axial direction are configured such that one of the cylinder tube and the piston rod is attached to the first boom in the boom body and the other is the second boom. A hydraulic cylinder attached to and extending substantially parallel to the axis of the boom body;
As the second boom moves relative to the first boom by the expansion and contraction operation of the hydraulic cylinder, the third boom moves relative to the second boom and the fourth boom moves to the second boom. A boom telescopic mechanism for moving the boom body in the axial direction by moving relative to the three booms;
A line-shaped member provided extending from the base end side of the boom main body to the front end side in the boom main body;
Together with the base end side is attached to the third boom is located below the hydraulic cylinder extend substantially parallel to the axis in the boom body, rolling the fourth boom inner peripheral lower surface above the front end side A guide member having a roller or a sliding member to slide;
A base end portion is attached to the inner peripheral lower surface of the first boom, and a tip end portion is attached to the base end side of the guide member or the third boom to protect the line-shaped member therein and A first protective guide member that is deformed in accordance with an expansion and contraction operation and guides the line-shaped member;
A proximal end is attached to the distal end side of the guide member or inside the third boom, and a distal end is attached to the inner peripheral lower surface of the fourth boom, protecting the line-shaped member inside and expanding and contracting the boom body. A second protective guide member that deforms along with the operation and guides the line-shaped member;
The line-shaped member is guided by the first protection guide member, the guide member, and the second protection guide member in this order from the base end side of the boom body in a region below the hydraulic cylinder in the boom body. telescopic boom of a work vehicle, characterized in that provided extending toward the distal end side of the base boom Te.

The telescopic boom for a work vehicle according to claim 1, further comprising a roller that rolls on an upper surface of the guide member at a distal end portion of the hydraulic cylinder.

A telescopic boom of a work vehicle that is attached to a traveling body so as to freely move up and down, and has a work machine at a tip part,
A boom body in which a first boom, a second boom, a third boom, and a fourth boom are configured to be nested in this order, and a base end portion of the first boom is attached to the traveling body;
The cylinder tube and a piston rod that is movable relative to the cylinder tube in the axial direction are configured such that one of the cylinder tube and the piston rod is attached to the first boom in the boom body and the other is the second boom. A hydraulic cylinder attached to and extending substantially parallel to the axis of the boom body;
As the second boom moves relative to the first boom by the expansion and contraction operation of the hydraulic cylinder, the third boom moves relative to the second boom and the fourth boom moves to the second boom. A boom telescopic mechanism for moving the boom body in the axial direction by moving relative to the three booms;
A line-shaped member provided extending from the base end side of the boom main body to the front end side in the boom main body;
Together with the base end side is attached to the third boom is located above the hydraulic cylinder extend substantially parallel to the axis in the boom body, rolling the fourth boom inner peripheral lower surface above the front end side A guide member having a roller or a sliding member to slide;
A base end portion is attached to the inner peripheral upper surface of the first boom, and a tip end portion is attached to the base end side of the guide member or the third boom to protect the line-shaped member therein and A first protective guide member that is deformed in accordance with an expansion and contraction operation and guides the line-shaped member;
A base end portion is attached to the distal end side of the guide member or in the third boom, and a distal end portion is attached to the inner peripheral upper surface of the fourth boom to protect the line-shaped member inside and extend and contract the boom body. A second protective guide member that deforms along with the operation and guides the line-shaped member;
The line-shaped member, in the upper region of the hydraulic cylinder in the boom body, the first protective guide member from the base end of the boom body is guided by the respective order of said guide member and said second protective guide member telescopic boom of a work vehicle, characterized in that provided extending toward the distal end side of the base boom Te.

The telescopic boom for a work vehicle according to claim 3, further comprising a roller that rolls on an inner peripheral lower surface of the fourth boom and the third boom at a tip end portion of the hydraulic cylinder.

A proximal end side is attached to the second boom in the boom body, and a distal end side is attached to the guide member so as to be slidable with respect to the guide member as the boom body extends and contracts. The telescopic boom for a work vehicle according to claim 3 or 4, further comprising a second guide member that supports an intermediate portion of the guide member.