JP2022150624A - crane - Google Patents

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JP2022150624A
JP2022150624A JP2021053307A JP2021053307A JP2022150624A JP 2022150624 A JP2022150624 A JP 2022150624A JP 2021053307 A JP2021053307 A JP 2021053307A JP 2021053307 A JP2021053307 A JP 2021053307A JP 2022150624 A JP2022150624 A JP 2022150624A
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operating
jib
operating member
holding
lock
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修平 川本
Shuhei Kawamoto
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Sumitomo Heavy Industries Construction Crane Co Ltd
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Sumitomo Heavy Industries Construction Crane Co Ltd
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Priority to JP2021053307A priority Critical patent/JP2022150624A/en
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Abstract

To provide a crane capable of reducing the occurrence of a situation in which it is impossible to switch between the holding of a jib and the releasing of the holding.SOLUTION: A crane includes a boom, a jib mounted on the boom to be raised and lowered, and a holding mechanism (20) for holding the jib in a folded state with respect to the boom. The holding mechanism (20) includes a lock member (22) movable between a lock position (P1) in which the jib is held and a lock releasing position (P2) in which the holding of the jib is released and a first operation member (23) and a second operation member (24) receiving force by driving or from the outside to move the lock member between the lock position and the lock releasing position. When the first operation member (23) becomes inoperable, the second operation member (24) is configured to move the lock member (22) between the lock position (P1) and the lock releasing position (2) regardless of the mode of the first operation member (23).SELECTED DRAWING: Figure 4

Description

本発明は、クレーンに関する。 The present invention relates to cranes.

特許文献1には、アクチュエータによりジブの保持及び保持の解除が可能であり、さらに、アクチュエータが作動不能となった場合でも手動でジブの保持及び保持解除が可能なジブ係留装置が示されている。 Patent Literature 1 discloses a jib mooring device that can hold and release the jib by an actuator, and that can manually hold and release the jib even if the actuator becomes inoperable. .

特許第6756239号公報Japanese Patent No. 6756239

しかしながら、上記のジブ係留装置では、アクチュエータが固着して作動不能となった場合に、手動でジブの保持と保持の解除との切替えができなくなる。 However, in the jib mooring device described above, if the actuator is stuck and becomes inoperable, it becomes impossible to manually switch between holding and releasing the jib.

本発明は、ジブの保持と保持の解除とが切替え不能となる状況の発生を低減することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to reduce the occurrence of a situation in which it is impossible to switch between holding a jib and releasing the holding.

本発明に係るクレーンは、
ブームと、前記ブームに起伏可能に取り付けられたジブと、前記ブームに対して折り畳まれた状態の前記ジブを保持する保持機構とを備えるクレーンであって、
前記保持機構は、
前記ジブを保持するロック位置と前記ジブの保持を解除するロック解除位置とに移動可能なロック部材と、
自身の駆動によりあるいは外部から力を受けて、前記ロック部材を前記ロック位置と前記ロック解除位置とに動かす第1操作部材及び第2操作部材と、
を有し、
前記第2操作部材は、前記第1操作部材による前記ロック部材の前記ロック解除位置への移動が不能になった場合に、前記第1操作部材の態様によらずに前記ロック部材を前記ロック解除位置に動かすことが可能に構成される。
A crane according to the present invention includes:
A crane comprising a boom, a jib hoistably attached to the boom, and a holding mechanism holding the jib in a folded state with respect to the boom,
The holding mechanism is
a locking member movable between a lock position for holding the jib and an unlock position for releasing the holding of the jib;
a first operating member and a second operating member for moving the locking member between the locking position and the unlocking position by being driven by itself or by receiving a force from the outside;
has
When the lock member cannot be moved to the unlock position by the first operation member, the second operation member is configured to operate the lock member to unlock regardless of the mode of the first operation member. configured to be movable into position;

本発明によれば、ジブの保持と保持の解除とが切替え不能となる状況の発生を低減できる。 According to the present invention, it is possible to reduce the occurrence of a situation in which it is impossible to switch between holding the jib and releasing the holding.

本発明の実施形態に係るクレーンを示す側面図である。It is a side view showing a crane concerning an embodiment of the present invention. 実施形態の保持機構を示す平面図(a)、正面図(b)及び側面図(c)である。It is the top view (a), front view (b), and side view (c) which show the holding|maintenance mechanism of embodiment. 保持機構の第1支持部材を示す後方斜視図である。It is a rear perspective view which shows the 1st support member of a holding|maintenance mechanism. フック部材のロック位置(a)とロック解除位置(b)とを説明する図である。It is a figure explaining the locking position (a) and unlocking position (b) of a hook member. 第1操作部材の操作によるジブの保持及び保持解除の動作を説明する図であり、(a)~(c)は当該動作の各ステップを示す図である。FIG. 10 is a diagram for explaining the operation of holding and releasing the jib by operating the first operating member, and (a) to (c) are diagrams showing steps of the operation. 作動部が最も押し出された状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。FIG. 10A is a diagram for explaining the operation of the holding mechanism when the first operating member fails when the operating portion is pushed out to the maximum, and (a) is a step of removing the first operating member and (b) is a step of holding the jib. , (c) shows the step of releasing the holding of the jib. 作動部が中程度に押し出された状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。FIG. 4A is a diagram for explaining the operation of the holding mechanism when the first operating member fails while the operating portion is moderately pushed out, and FIG. 4A is a step of removing the first operating member, and FIG. (c) shows the step of releasing the holding of the jib. 作動部が最も引き込まれた状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。FIG. 10B is a diagram for explaining the operation of the holding mechanism when the first operating member fails when the operating portion is retracted to the maximum; (a) is the step of removing the first operating member; , (c) shows the step of releasing the holding of the jib. ロック検知装置を示す保持機構の側面図であり、(a)はジブが保持されているときの状態、(b)はジブの保持が解除されたときの状態を示す。FIG. 4 is a side view of the holding mechanism showing the lock detection device, where (a) shows the state when the jib is held, and (b) shows the state when the jib is released.

以下、本発明の実施形態について図面を参照して詳細に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図1は、本発明の実施形態に係るクレーンを示す側面図である。図1は、ジブ14が折り畳まれた状態を実線で示し、ジブ14が起きた状態を二点鎖線で示す。 1 is a side view showing a crane according to an embodiment of the invention; FIG. FIG. 1 shows the folded state of the jib 14 in solid lines and the upright state of the jib 14 in two-dot chain lines.

本実施形態のクレーン1は、下部構造体11と、下部構造体11に対して旋回駆動する上部旋回体12と、上部旋回体12に起伏可能に接続されたブーム13と、ブーム13に起伏可能に接続されたジブ14と、ジブからワイヤーロープLを介して吊り下げられたフック15と、ブーム13に対して折り畳またれた状態のジブ14を保持可能な保持機構20と、オペレータから運転操作を受ける運転操作部を有する運転室18とを備える。 The crane 1 of this embodiment includes a lower structure 11, an upper revolving structure 12 that rotates with respect to the lower structure 11, a boom 13 that is connected to the upper revolving structure 12 so that it can be raised and lowered, and a boom that can be raised and lowered. a jib 14 connected to the jib, a hook 15 suspended from the jib via a wire rope L, a holding mechanism 20 capable of holding the jib 14 in a folded state with respect to the boom 13, and an operation operation from the operator. and a driver's cab 18 having a driver control for receiving.

クレーン1は、例えばタワークレーンである。保持機構20によって保持されるジブ14の折り畳まれた状態とは、例えばブーム13が起立し、ジブ14がブーム13に近接した状態である。 Crane 1 is, for example, a tower crane. The folded state of the jib 14 held by the holding mechanism 20 is, for example, a state in which the boom 13 stands up and the jib 14 is close to the boom 13 .

下部構造体11は、例えばクローラなどの走行体であってもよいし、固定された構造体であってもよい。上部旋回体12には、ブーム13の起伏、ジブ14の起伏、フック15の昇降を行うためにワイヤーロープを巻き取り又は繰り出す複数のウインチUが設けられる。運転室18には、保持機構20の第1操作部材(電動アクチュエータ)23を駆動するための操作手段(操作ボタン等)が配置されてもよい。 The lower structure 11 may be a traveling body such as a crawler, or may be a fixed structure. The upper revolving body 12 is provided with a plurality of winches U for winding or feeding wire ropes for raising and lowering the boom 13, raising and lowering the jib 14, and raising and lowering the hook 15. As shown in FIG. An operation means (operation button or the like) for driving the first operation member (electric actuator) 23 of the holding mechanism 20 may be arranged in the operator's cab 18 .

図2は、実施形態の保持機構を示す平面図(a)、正面図(b)及び側面図(c)である。図3は、保持機構の第1支持部材を示す後方斜視図である。図4は、フック部材のロック位置(a)とロック解除位置(b)とを説明する図である。図4、並びに、以下に示す図5~図7においては、バー(被保持部)31を長手方向途中の断面で示し、付勢部材25に関する構成を省略している。 FIG. 2 is a plan view (a), a front view (b), and a side view (c) showing the holding mechanism of the embodiment. FIG. 3 is a rear perspective view showing the first support member of the holding mechanism; FIG. FIG. 4 is a diagram for explaining the locked position (a) and the unlocked position (b) of the hook member. In FIG. 4 and FIGS. 5 to 7 shown below, the bar (held portion) 31 is shown in cross section in the middle of the longitudinal direction, and the configuration related to the urging member 25 is omitted.

保持機構20は、主要部がブーム13に取り付けられ、ブーム13に対してジブ14が折り畳まれた状態でジブ14の保持と、保持の解除とが可能な機構である。保持機構20は、ブーム13の主部材又は補助材に連結されるベース部材21と、ベース部材21に回動自在に支持されたフック部材22と、左右のフック部材22を連結する回動軸22xと、自身が駆動することでフック部材22を動かすことができる第1操作部材23と、外部から力を受けることでフック部材22を動かすことができる第2操作部材24と、フック部材22を回動方向の一方に付勢する付勢部材(例えばコイルばね)25と、第1操作部材23の一端部を取り外し可能に支持する第1支持部材26と、各部材を支持するステー27と、ジブ14の主部材又は補助材に連結されるバー31とを備える。フック部材22は、本発明に係るロック部材の一例に相当する。 The holding mechanism 20 is a mechanism whose main part is attached to the boom 13 and which can hold and release the jib 14 in a state where the jib 14 is folded with respect to the boom 13 . The holding mechanism 20 includes a base member 21 connected to the main member or auxiliary member of the boom 13, a hook member 22 rotatably supported by the base member 21, and a rotating shaft 22x connecting the left and right hook members 22. , a first operating member 23 capable of moving the hook member 22 by being driven by itself, a second operating member 24 capable of moving the hook member 22 by receiving force from the outside, and rotating the hook member 22. A biasing member (for example, a coil spring) 25 that biases in one direction of movement, a first support member 26 that detachably supports one end of the first operation member 23, a stay 27 that supports each member, and a jib. A bar 31 connected to 14 main or auxiliary members. The hook member 22 corresponds to an example of the locking member according to the invention.

ステー27は、第1操作部材23の一端部を回動自在に支持する支持部27aと、第2操作部材24を連結する連結部27bと、付勢部材25を支持する支持部27cと、第1支持部材26から第1操作部材23が外れたときに第1操作部材23を支持する部材支持部27dとを備える。ステー27はフック部材22に取り付けられる。部材支持部27dは、本発明に係る第2支持部材の一例に相当する。 The stay 27 includes a support portion 27a that rotatably supports one end of the first operation member 23, a connection portion 27b that connects the second operation member 24, a support portion 27c that supports the biasing member 25, and a member supporting portion 27d that supports the first operating member 23 when the first operating member 23 is detached from the first supporting member 26 . The stay 27 is attached to the hook member 22 . The member support portion 27d corresponds to an example of a second support member according to the invention.

フック部材22は、バー31に引っ掛かってバー31を拘束可能なフック部22hと、フック部22hよりも回動軸側に位置しかつバー31が当接可能なカム部22cと、回動側の縁に位置する傾斜部22aとを有する(図4(a)を参照)。 The hook member 22 includes a hook portion 22h that can be hooked on the bar 31 to restrain the bar 31, a cam portion 22c that is located closer to the rotation shaft than the hook portion 22h and can be brought into contact with the bar 31, and a rotation-side cam portion 22c. and an inclined portion 22a located at the edge (see FIG. 4(a)).

フック部材22は、図4(a)に示すように、バー31を保持可能なロック位置P1と、図4(b)に示すように、バー31の保持が解除されるロック解除位置P2とに移動可能(回動可能)である。バー31を保持するということは、バー31が連結されたジブ14を保持することを意味する。バー31の保持を解除するということは、バー31が連結されたジブ14の保持を解除することを意味する。フック部材22は、バー31の長手方向と交差する平面に沿った方向に回動する。ロック位置P1においてフック部22hはバー31の移動経路(ジブ14の回動に伴う移動経路)上に位置し、フック部22h内にバー31が位置する場合にはバー31がフック部材22から離間する方向に移動しても、バー31がフック部材22から外れないようにバー31に引っ掛かる。ロック解除位置P2においてフック部22hは、バー31の移動経路(ジブ14の回動に伴う移動経路)から外れる。以下、フック部材22の回動方向のうち、ロック解除位置P2からロック位置P1へ向かう方向を「ロック方向」と呼び、ロック位置P1からロック解除位置P2へ向かう方向を「解除方向」と呼ぶ。 The hook member 22 has a lock position P1 at which the bar 31 can be held, as shown in FIG. 4(a), and an unlock position P2, at which the bar 31 is released from being held, as shown in FIG. 4(b). It is movable (rotatable). Holding the bar 31 means holding the jib 14 to which the bar 31 is connected. Releasing the holding of the bar 31 means releasing the holding of the jib 14 to which the bar 31 is connected. The hook member 22 rotates along a plane intersecting the longitudinal direction of the bar 31 . At the lock position P1, the hook portion 22h is positioned on the movement path of the bar 31 (movement path associated with the rotation of the jib 14), and when the bar 31 is positioned within the hook portion 22h, the bar 31 is separated from the hook member 22. The hook member 22 is hooked on the bar 31 so that the bar 31 does not come off the hook member 22 even when the hook member 22 is moved in the direction to move. At the unlocked position P2, the hook portion 22h is removed from the movement path of the bar 31 (the movement path associated with the rotation of the jib 14). Hereinafter, among the rotation directions of the hook member 22, the direction from the unlocked position P2 to the locked position P1 will be referred to as the "locking direction", and the direction from the locking position P1 to the unlocked position P2 will be referred to as the "releasing direction".

カム部22cは、フック部材22がロック解除位置P2にあるときに、ジブ14の倒伏に伴うバー31の移動によりバー31が当接することで、フック部材22にロック方向の力を及ぼす。 When the hook member 22 is at the unlocked position P2, the cam portion 22c exerts a force in the locking direction on the hook member 22 by contacting the bar 31 due to movement of the bar 31 as the jib 14 falls.

傾斜部22aは、フック部材22がロック位置P1にあるときに、ジブ14の倒伏に伴うバー31の移動によりバー31が当接することで、フック部材22に解除方向の力を及ぼす。 When the hook member 22 is at the lock position P1, the inclined portion 22a exerts a force in the releasing direction on the hook member 22 by contacting the bar 31 due to movement of the bar 31 as the jib 14 falls.

付勢部材25は、ベース部材21とフック部材22との間で付勢力を発生し、フック部材22にロック方向の力を加える。フック部材22に外力が加わっていないとき、付勢部材25の付勢力により、フック部材22はロック位置P1に移動する。付勢部材25の一部はベース部材21に接続され、付勢部材25の他の部位がステー27を介してフック部材22に接続される。 The biasing member 25 generates a biasing force between the base member 21 and the hook member 22 and applies force to the hook member 22 in the locking direction. When no external force is applied to the hook member 22, the biasing force of the biasing member 25 moves the hook member 22 to the lock position P1. A portion of the biasing member 25 is connected to the base member 21 and the other portion of the biasing member 25 is connected to the hook member 22 via the stay 27 .

第1操作部材23は、基部と作動部とを有し、基部に対して作動部を動かす(例えば押出し及び引込み)ことのできる電動アクチュエータである。第1操作部材23は、例えば電動モータの回転駆動を作動部の直線運動に変換する電動アクチュエータであってもよい。このような構成により、電気的に大きな引込力又は押出力を発生することができ、また、外部からの力に対して容易に作動部が動かない特性が得られる。 The first operating member 23 is an electric actuator that has a base and an actuating portion and can move (eg push and retract) the actuating portion with respect to the base. The first operating member 23 may be, for example, an electric actuator that converts the rotational drive of an electric motor into linear motion of an operating portion. With such a configuration, it is possible to generate a large pulling force or pushing force electrically, and it is possible to obtain the characteristic that the operating part does not easily move against external force.

第1操作部材23は、基部及び作動部の一方が第1支持部材26に支持され、他方がステー27を介してフック部材22に支持される。第1操作部材23は、ステー27に対して回動可能に支持され、また、第1支持部材26に対して回動可能に支持される。したがって、第1操作部材23に作動部を引き付ける力が発生することで、フック部材22に解除方向の力を及ぼすことができる。 The first operating member 23 has one of its base portion and operating portion supported by the first support member 26 and the other supported by the hook member 22 via the stay 27 . The first operating member 23 is rotatably supported with respect to the stay 27 and rotatably supported with respect to the first support member 26 . Therefore, a force in the releasing direction can be applied to the hook member 22 by generating a force that attracts the operating portion to the first operating member 23 .

第1操作部材23の操作(駆動)によるフック部材22の可動範囲W1には、ロック位置P1とロック解除位置P2とが含まれる。図4(b)において、フック部材22の可動範囲W1は、第2操作部材24の中心軸の角度の変動範囲によって表わしている。 A movable range W1 of the hook member 22 by operating (driving) the first operating member 23 includes a lock position P1 and an unlock position P2. In FIG. 4B, the movable range W1 of the hook member 22 is represented by the variation range of the angle of the central axis of the second operating member 24. As shown in FIG.

第1支持部材26は、図3に示すように、少なくとも一方の端部が開放された溝枠26aを有し、第1操作部材23の張出部23aを溝枠26aで引っ掛けることで、第1操作部材23の一部を支持する。第1操作部材23の張出部23aがステー27の方へ引っ張られているときに、第1支持部材26は第1操作部材23を支持する。一方、当該引っ張る力が無く、ステー27と第1支持部材26とが近接すると、第1操作部材23の張出部23aが溝枠26aから外れることで、第1操作部材23が第1支持部材26から外すことができる。 As shown in FIG. 3, the first support member 26 has a groove frame 26a with at least one open end. 1 Supports a portion of the operating member 23 . The first supporting member 26 supports the first operating member 23 when the projecting portion 23 a of the first operating member 23 is pulled toward the stay 27 . On the other hand, when there is no pulling force and the stay 27 and the first support member 26 come close to each other, the projecting portion 23a of the first operation member 23 is disengaged from the groove frame 26a, so that the first operation member 23 moves toward the first support member. 26 can be removed.

第2操作部材24は、ステー27を介してフック部材22に連結されたアーム部材であり、操作ロープ24aが接続されている。アーム部材とは、2点間を結ぶ部材であり、例えば長尺部材、桿部材、ブロック状の部材、直線状に延在する部材、曲がった経路で延在する部材、等々であってもよい。操作ロープ24aを手動で引っ張ることで、第2操作部材24からフック部材22に解除方向の力を及ぼすことができる。尚、操作ロープ24aは、例えば、第1操作部材23を駆動するための電力供給用又は信号用のケーブル(不図示)であってもよい。あるいは、操作ロープ24aは、ロック検知装置40(図9を参照)の電力供給用又は信号用のケーブル(不図示)であってもよい。これらのケーブルは、クレーン1の本体と第1操作部材23とに繋がるか、あるいは、クレーン1の本体とロック検知装置40とに繋がり、電力又は信号を伝送する。したがって、ケーブルの途中の部分を第2操作部材24に接続することができる。このような構成であっても、ケーブルを手動で引っ張ることで、第2操作部材24にフック部材22を解除する方向の力を及ぼすことができる。この場合、保持機構20の部品点数が削減され、組立工数も削減できる。 The second operating member 24 is an arm member connected to the hook member 22 via a stay 27, and is connected to an operating rope 24a. An arm member is a member that connects two points, and may be, for example, a long member, a rod member, a block-shaped member, a member extending linearly, a member extending along a curved path, or the like. . By manually pulling the operating rope 24a, the second operating member 24 can apply force to the hook member 22 in the releasing direction. The operation rope 24a may be, for example, a power supply or signal cable (not shown) for driving the first operation member 23. FIG. Alternatively, the operating rope 24a may be a cable (not shown) for power supply or signal for the lock detection device 40 (see FIG. 9). These cables are connected to the main body of the crane 1 and the first operating member 23, or connected to the main body of the crane 1 and the lock detection device 40, and transmit power or signals. Therefore, the middle portion of the cable can be connected to the second operating member 24 . Even with such a configuration, by manually pulling the cable, a force can be applied to the second operating member 24 in a direction to release the hook member 22 . In this case, the number of parts of the holding mechanism 20 can be reduced, and the number of assembly man-hours can also be reduced.

第2操作部材24の操作(回動操作)によるフック部材22の可動範囲W2(図8(a)も参照)には、ロック位置P1とロック解除位置P2とが含まれる。また、当該可動範囲W2は、第1操作部材23の操作によるフック部材の可動範囲W1よりも大きい。図4(b)、図8(a)において、フック部材22の可動範囲W2は、第2操作部材24の中心軸の角度の変動範囲によって表わしている。 A movable range W2 (see also FIG. 8A) of the hook member 22 by the operation (rotating operation) of the second operating member 24 includes the lock position P1 and the unlock position P2. Further, the movable range W2 is larger than the movable range W1 of the hook member by operating the first operating member 23 . 4(b) and 8(a), the movable range W2 of the hook member 22 is represented by the variation range of the angle of the central axis of the second operating member 24. As shown in FIG.

図9は、ロック検知装置を示す保持機構の側面図であり、(a)はジブが保持されているときの状態、(b)はジブの保持が解除されたときの状態を示す。 FIG. 9 is a side view of the holding mechanism showing the lock detection device, where (a) shows the state when the jib is held, and (b) shows the state when the jib is released.

左側のフック部材22には、ロック検知装置40が取り付けられている。左側のフック部材22は、第1操作部材23が配置された右側のフック部材22とは反対側に配置されている。ロック検知装置40は、フック部材22が、ロック位置P1になったことを検知する。ロック検知装置40は、フック部材22がロック位置P1となることでバー31を保持したことを検知するリミットスイッチ41と、リミットスイッチ41のスイッチを作動させることが可能な検知レバー42と、検知レバー42をバー31と接触可能に保持する検知レバー保持部材(ばね)43とを備える。 A lock detection device 40 is attached to the left hook member 22 . The left hook member 22 is arranged on the opposite side to the right hook member 22 where the first operating member 23 is arranged. The lock detection device 40 detects that the hook member 22 has reached the lock position P1. The lock detection device 40 includes a limit switch 41 for detecting that the bar 31 is held when the hook member 22 is at the lock position P1, a detection lever 42 capable of operating the switch of the limit switch 41, and a detection lever 42 and a detection lever holding member (spring) 43 that holds the bar 31 so as to be in contact with the bar 31 .

検知レバー42は、フック部材22に対して回動可能に支持されている。ロック解除位置P2において、検知レバー42は、リミットスイッチ41のスイッチ部41aと接触しないように検知レバー保持部材43により付勢されている。フック部材22がロック位置P1に向かうと検知レバー42がバー31に接触し、検知レバー42をリミットスイッチ41側に向かって回動する。フック部材22がロック位置P1に移動したときに、検知レバー42は、リミットスイッチ41のスイッチ部41aを押し、リミットスイッチ41は
オン信号を出力する。当該オン信号により、バー31が保持されたと判定できる。運転室18の表示器(不図示)は、リミットスイッチ41のオン信号に基づきロック(ジブ14の保持)したことを表示する。
The detection lever 42 is rotatably supported with respect to the hook member 22 . At the unlocked position P<b>2 , the detection lever 42 is biased by the detection lever holding member 43 so as not to contact the switch portion 41 a of the limit switch 41 . When the hook member 22 moves toward the lock position P1, the detection lever 42 contacts the bar 31 and rotates toward the limit switch 41 side. When the hook member 22 moves to the lock position P1, the detection lever 42 pushes the switch portion 41a of the limit switch 41, and the limit switch 41 outputs an ON signal. From the ON signal, it can be determined that the bar 31 is held. A display (not shown) in the operator's cab 18 indicates that the jib 14 is locked (holding of the jib 14) based on the ON signal of the limit switch 41. FIG.

<第1操作部材によるジブの保持及び保持解除の動作>
図5は、第1操作部材の操作によるジブの保持及び保持解除の動作を説明する図であり、(a)~(c)は当該動作の各ステップを示す図である。以下、ジブ14及びバー31の回動方向のうち、ジブ14がブーム13に近接する方向を「近接方向」と呼び、ジブ14がブーム13から離間する方向を「離間方向」と呼ぶ。
<Operation of holding and releasing the jib by the first operating member>
5A to 5C are diagrams for explaining the operation of holding and releasing the jib by operating the first operating member, and (a) to (c) are diagrams showing steps of the operation. Hereinafter, among the rotation directions of the jib 14 and the bar 31, the direction in which the jib 14 approaches the boom 13 is called the "approaching direction", and the direction in which the jib 14 separates from the boom 13 is called the "separating direction".

図5(a)に示すように、フック部材22がロック位置P1にあり、バー31がフック部22h内に位置するとき、ロック解除の操作がない限り、バー31及びジブ14の拘束状態が保持される。すなわち、ジブ14及びバー31が離間方向へ移動しようとしても、フック部22hがバー31を拘束し、ジブ14の回動も拘束される。 As shown in FIG. 5(a), when the hook member 22 is at the locking position P1 and the bar 31 is positioned within the hook portion 22h, the restrained state of the bar 31 and the jib 14 is maintained unless the lock is unlocked. be done. That is, even if the jib 14 and the bar 31 try to move in the separation direction, the hook portion 22h restrains the bar 31, and the rotation of the jib 14 is also restrained.

第1操作部材23(電動アクチュエータ)が駆動して、第1支持部材26にステー27を引き付ける力が生じると、図5(b)に示すように、フック部材22が解除方向に回動する。そして、第1操作部材23の駆動量(引付け駆動量)が最大のとき、図5(c)に示すように、バー31の移動経路(ジブ14の起伏に伴うバー31の移動経路)上から、フック部22hが外れ、ジブ14のロックが解除される。このとき、ジブ14に起立させる力が加わることで、ジブ14を離間方向に回動できる。可動範囲W1は、第1操作部材23の駆動量がゼロ(最も延びた状態)のときのフック部材22の角度から、第1操作部材23の駆動量が最大(最も縮んだ状態)のときのフック部材22の角度までの範囲に相当する。 When the first operating member 23 (electric actuator) is driven to generate a force that attracts the stay 27 to the first support member 26, the hook member 22 rotates in the release direction as shown in FIG. 5(b). When the drive amount (attraction drive amount) of the first operating member 23 is maximum, as shown in FIG. , the hook portion 22h is released, and the jib 14 is unlocked. At this time, a force is applied to the jib 14 to make it stand up, so that the jib 14 can be rotated in the separation direction. The movable range W1 ranges from the angle of the hook member 22 when the drive amount of the first operating member 23 is zero (the most extended state) to the angle when the first operating member 23 is maximized (the most contracted state). It corresponds to the range up to the angle of the hook member 22 .

ジブ14の保持が解除されている状態からジブ14を保持する際には、まず、第1操作部材23を図5(c)のように駆動する。そして、ジブ14を折り畳むことでバー31をフック部22h内に収容可能な位置まで移動させる。その後、第1操作部材23の作動部を、図5(b)、図5(a)のように押し出すことで、バー31がフック部22h内に拘束され、ジブ14を折り畳んだ状態に保持できる。 When holding the jib 14 from the state in which the holding of the jib 14 is released, first, the first operating member 23 is driven as shown in FIG. 5(c). By folding the jib 14, the bar 31 is moved to a position where it can be accommodated in the hook portion 22h. After that, by pushing out the operating portion of the first operating member 23 as shown in FIGS. 5(b) and 5(a), the bar 31 is restrained in the hook portion 22h, and the jib 14 can be held in the folded state. .

ジブ14が折り畳まれる際、バー31が近接方向に更に移動すると、バー31はフック部材22のカム部22cに当接する。そして、当該当接により、フック部材22にロック方向の力が加わり、第1操作部材23の作動部の引込み、並びに、フック部材22のロック方向への回動をスムーズに実現することができる。 When the jib 14 is folded, the bar 31 contacts the cam portion 22c of the hook member 22 as the bar 31 moves further in the approaching direction. Due to this abutment, a force in the locking direction is applied to the hook member 22, and the retraction of the operating portion of the first operating member 23 and the rotation of the hook member 22 in the locking direction can be realized smoothly.

図5(a)~図5(c)の各状態において、フック部材22には付勢部材25(図2(c)を参照)によりロック方向の力が加わり、第1支持部材26に対して第1操作部材23を引っ張る力が作用するので、第1操作部材23の張出部23aが第1支持部材26の溝枠26a(図3を参照)から抜けることがない。 5(a) to 5(c), a force in the locking direction is applied to the hook member 22 by the biasing member 25 (see FIG. 2(c)), and the first support member 26 is Since the force that pulls the first operating member 23 acts, the projecting portion 23a of the first operating member 23 does not come off from the groove frame 26a (see FIG. 3) of the first supporting member 26. As shown in FIG.

<第1操作部材の故障の例>
第1操作部材23(電動アクチュエータ)が故障した場合、故障したタイミングによって第1操作部材23の状態に違いが生じる。例えば、図5(a)の段階で故障した場合、第1操作部材23は作動部が最も押し出された状態で固まる。図5(b)の段階で故障した場合、第1操作部材23は作動部が中程度に押し出された状態で固まる。図5(c)の段階で故障した場合、第1操作部材23は作動部が最も引き込まれた状態で固まる。
<Example of failure of the first operation member>
When the first operating member 23 (electric actuator) fails, the state of the first operating member 23 varies depending on the timing of the failure. For example, if a failure occurs at the stage of FIG. 5(a), the first operating member 23 will harden in a state in which the operating portion is pushed out to the maximum. If the failure occurs at the stage of FIG. 5(b), the first operating member 23 will harden in a state in which the operating portion is moderately pushed out. In the event of failure at the stage of FIG. 5(c), the first operating member 23 is solidified with the operating portion retracted to the maximum.

一方、本実施形態の保持機構20によれば、次に示すように、第1操作部材23がどのような段階で故障した場合でも、第2操作部材24の操作によって、ジブ14の保持と保
持の解除とを行うことができる。
On the other hand, according to the holding mechanism 20 of the present embodiment, as described below, even when the first operating member 23 fails at any stage, the second operating member 24 is operated to hold and hold the jib 14. can be released.

<第2操作部材によるジブの保持及び保持解除の動作1>
図6は、作動部が最も押し出された状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。
<Operation 1 for holding and releasing the jib by the second operating member>
6A and 6B are diagrams for explaining the operation of the holding mechanism when the first operating member fails when the operating portion is pushed out to the maximum. (c) shows a step of releasing the holding of the jib.

作動部が最も押し出された状態で第1操作部材23が故障した場合、図6(a)に示すように、操作ロープ24aが手動等により引かれることで、第2操作部材24を介して力が伝達されて、フック部材22が解除方向へ回動する。すると、第1操作部材23では作動部が固まっているので、第1支持部材26に対する第1操作部材23からの引っ張り力が無くなって、図6(a)に示すように、第1操作部材23が第1支持部材26から外れる。すなわち、第1操作部材23の張出部23aが第1支持部材26の溝枠26aに沿って移動し、溝枠26aの一端側から外れる。第1操作部材23から外された第1操作部材23は、重力に従って支持部27aを中心に回動し、ステー27の部材支持部27dに当接して停止する。すなわち、部材支持部27dが第1操作部材23を片側支持する。部材支持部27dは、フック部材22に対して固定なので、フック部材22が回動しても、フック部材22と部材支持部27dに支持された第1操作部材23との相対角度は変わらない。したがって、部材支持部27dは、フック部材22の回動位置に拘らずに、第1操作部材23を他の部材(第1支持部材26など)と干渉させない角度で、継続的に支持できる。 When the first operating member 23 fails in the state in which the operating portion is pushed out to the maximum, as shown in FIG. is transmitted, and the hook member 22 rotates in the releasing direction. Then, since the operating portion of the first operating member 23 is solidified, the pulling force from the first operating member 23 to the first supporting member 26 disappears, and the first operating member 23 moves as shown in FIG. 6(a). comes off the first support member 26 . That is, the protruding portion 23a of the first operating member 23 moves along the groove frame 26a of the first support member 26 and is removed from one end side of the groove frame 26a. The first operating member 23 removed from the first operating member 23 rotates around the supporting portion 27a according to gravity, and comes into contact with the member supporting portion 27d of the stay 27 and stops. That is, the member supporting portion 27d supports the first operating member 23 on one side. Since the member supporting portion 27d is fixed to the hook member 22, even if the hook member 22 rotates, the relative angle between the hook member 22 and the first operating member 23 supported by the member supporting portion 27d does not change. Therefore, the member support portion 27d can continuously support the first operation member 23 at an angle that does not interfere with other members (the first support member 26, etc.) regardless of the rotational position of the hook member 22. FIG.

故障した第1操作部材23が第1支持部材26から外れることで、その後は、第1操作部材23の影響を受けずに、第2操作部材24の操作によって、ジブ14の保持と保持解除の操作を行うことができる。 Since the failed first operating member 23 is removed from the first supporting member 26, the jib 14 can be held and released by operating the second operating member 24 without being affected by the first operating member 23 thereafter. operation can be performed.

例えば、図6(b)に示すように、操作ロープ24aを引くのをやめると、付勢部材25の付勢力によりフック部材22をロック位置P1まで回動させることができる。このとき、バー31がフック部22h内に収容可能に位置することで、バー31をフック部22h内で拘束し、ジブ14を折り畳んだ状態に保持することができる。 For example, as shown in FIG. 6B, the hook member 22 can be rotated to the lock position P1 by the biasing force of the biasing member 25 when the operation rope 24a is stopped being pulled. At this time, since the bar 31 is positioned so as to be accommodated within the hook portion 22h, the bar 31 can be restrained within the hook portion 22h and the jib 14 can be held in a folded state.

なお、第1操作部材23が故障した状態で、ジブ14を折り畳んだ状態に保持する場合には、操作ロープ24aを引くことなく、ジブ14を回動し、バー31を近接方向に移動させてもよい。当該移動により、バー31がフック部材22の傾斜部22aに当接すると、フック部材22が解除方向に回動し、バー31をフック部22h内へ押し込むことができる。 When the jib 14 is to be held in the folded state when the first operating member 23 has failed, the jib 14 is rotated to move the bar 31 in the approaching direction without pulling the operating rope 24a. good too. As a result of this movement, when the bar 31 comes into contact with the inclined portion 22a of the hook member 22, the hook member 22 rotates in the release direction, and the bar 31 can be pushed into the hook portion 22h.

ジブ14の保持を解除する場合には、図6(c)に示すように、操作ロープ24aを大きく引くことで、第2操作部材24を介してフック部材22が解除方向へ回動する。そして、フック部材22がロック解除位置P2まで回動し、フック部22hがバー31の移動経路上から外れることで、バー31の拘束が解除され、ジブ14の保持が解除される。 When the jib 14 is released from being held, the hook member 22 rotates in the releasing direction via the second operating member 24 by pulling the operating rope 24a largely, as shown in FIG. 6(c). Then, the hook member 22 rotates to the lock release position P2, and the hook portion 22h is removed from the moving path of the bar 31, so that the restraint of the bar 31 is released and the jib 14 is released from being held.

部材支持部27dは、操作ロープ24aをどのように引いたり戻したりした場合でも、第1操作部材23が第1支持部材26に支持される状態に戻ることがない位置で、第1操作部材23を支持する。 The member supporting portion 27d is positioned so that the first operating member 23 does not return to the state of being supported by the first supporting member 26 no matter how the operating rope 24a is pulled or returned. support.

<第2操作部材によるジブの保持及び保持解除の動作2>
図7は、作動部が中程度に押し出された状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。
<Operation 2 for holding and releasing the jib by the second operating member>
7A and 7B are diagrams for explaining the operation of the holding mechanism when the first operating member fails while the actuating portion is moderately pushed out, and FIG. 7A is the step of removing the first operating member; indicates the step of holding the jib, and (c) indicates the step of releasing the holding of the jib.

作動部が中程度に押し出された状態で第1操作部材23が故障した場合、図7(a)に示すように、操作ロープ24aが手動等により引かれることで、第2操作部材24を介して力が伝達されて、フック部材22が解除方向へ回動する。すると、第1操作部材23では作動部が固まっているので、第1支持部材26に対する第1操作部材23からの引っ張り力が無くなって、図7(a)に示すように、第1操作部材23が第1支持部材26から外れる。 When the first operating member 23 fails in a state in which the operating portion is pushed out moderately, as shown in FIG. force is transmitted to the hook member 22, and the hook member 22 rotates in the release direction. Then, since the operating portion of the first operating member 23 is solidified, the pulling force from the first operating member 23 to the first supporting member 26 disappears, and the first operating member 23 moves as shown in FIG. 7(a). comes off the first support member 26 .

図7(a)の例では、第1操作部材23の作動部が中程度まで引き込まれているため、前述した図6(a)の場合と比較して、第1操作部材23を第1支持部材26から外すために、第2操作部材24は大きい角度で回動する必要がある。 In the example of FIG. 7(a), the actuation portion of the first operating member 23 is retracted to the middle extent, so compared to the case of FIG. In order to disengage from member 26, second operating member 24 must be pivoted through a large angle.

第1操作部材23が第1支持部材26から外された後は、第1操作部材23の作動部が最も押し出された状態で故障した場合(図6(b)及び図6(c)の場合)と同様である。第1支持部材26から外された第1操作部材23は、部材支持部27dに支持される。そして、図7(b)、(c)に示すように、操作ロープ24aを引っ張る力を解除したり、操作ロープ24aを引っ張ったりすることで、フック部材22をロック位置P1とロック解除位置P2とに動かすことができる。 After the first operating member 23 is removed from the first supporting member 26, when the operating portion of the first operating member 23 is pushed out to the maximum and fails (in the case of FIGS. 6(b) and 6(c), ). The first operation member 23 removed from the first support member 26 is supported by the member support portion 27d. Then, as shown in FIGS. 7B and 7C, the hook member 22 is moved between the lock position P1 and the unlock position P2 by releasing the pulling force of the operation rope 24a or by pulling the operation rope 24a. can be moved to

<第2操作部材によるジブの保持及び保持解除の動作3>
図8は、作動部が最も引き込まれた状態で第1操作部材が故障した場合の保持機構の動作を説明する図であり、(a)は第1操作部材を外す工程、(b)はジブを保持する工程、(c)はジブの保持を解除する工程を示す。
<Operation 3 for holding and releasing the jib by the second operating member>
8A and 8B are diagrams for explaining the operation of the holding mechanism when the first operating member fails when the operating portion is retracted to the maximum, and FIG. (c) shows a step of releasing the holding of the jib.

作動部が最も引き込まれた状態で第1操作部材23が故障した場合、図8(a)に示すように、操作ロープ24aが手動等により引かれることで、第2操作部材24を介して力が伝達されて、フック部材22が解除方向へ回動する。すると、第1操作部材23では作動部が固まっているので、第1支持部材26に対する第1操作部材23からの引っ張り力が無くなって、図8(a)に示すように、第1操作部材23が第1支持部材26から外れる。 When the first operating member 23 fails when the operating portion is retracted to the maximum, as shown in FIG. is transmitted, and the hook member 22 rotates in the releasing direction. Then, since the operating portion of the first operating member 23 is solidified, the pulling force from the first operating member 23 to the first supporting member 26 disappears, and the first operating member 23 moves as shown in FIG. 8(a). comes off the first support member 26 .

図8(a)の場合、第1操作部材23の作動部が最も引き込まれているため、前述した図7(a)の場合と比較して、第1操作部材23を第1支持部材26から外すために、第2操作部材24は大きい角度で回動する必要がある。第2操作部材24の駆動によりフック部材22を回動できる可動範囲W2は、第1操作部材23の操作によりフック部材22を回動できる可動範囲W1よりも小さい。したがって、第1操作部材23の作動部が最も引き込まれている状態でも、操作ロープ24aを最大に引くことで、第1操作部材23を第1支持部材26から外すことができる。 In the case of FIG. 8(a), since the actuation portion of the first operating member 23 is retracted most, the first operating member 23 is moved away from the first support member 26 as compared with the case of FIG. 7(a) described above. For removal, the second operating member 24 must be rotated through a large angle. A movable range W2 within which the hook member 22 can be rotated by driving the second operating member 24 is smaller than a movable range W1 within which the hook member 22 can be rotated by operating the first operating member 23 . Therefore, even when the operating portion of the first operating member 23 is fully retracted, the first operating member 23 can be removed from the first support member 26 by pulling the operating rope 24a to the maximum.

第1操作部材23が第1支持部材26から外された後は、第1操作部材23の作動部が最も押し出された状態で故障した場合(図6(b)及び図6(c)の場合)、並びに、作動部が中程度に押し出された状態で故障した場合(図7(b)及び図7(c)の場合)と同様である。第1支持部材26から外された第1操作部材23は、部材支持部27dに支持される。そして、図8(b)、(c)に示すように、操作ロープ24aを引っ張る力を解除したり、操作ロープ24aを引っ張ったりすることで、フック部材22をロック位置P1とロック解除位置P2とに動かすことができる。 After the first operating member 23 is removed from the first supporting member 26, when the operating portion of the first operating member 23 is pushed out to the maximum and fails (in the case of FIGS. 6(b) and 6(c), ), and the case where the working part fails in a moderately pushed state (cases of FIGS. 7(b) and 7(c)). The first operation member 23 removed from the first support member 26 is supported by the member support portion 27d. Then, as shown in FIGS. 8B and 8C, the hook member 22 is moved between the lock position P1 and the unlock position P2 by releasing the pulling force of the operation rope 24a or by pulling the operation rope 24a. can be moved to

以上のように、本実施形態のクレーン1によれば、ジブ14を保持する保持機構20は、フック部材22を動かすことのできる第1操作部材23と第2操作部材24とを備える。さらに、第2操作部材24は、第1操作部材23が操作不能になった場合に、第1操作
部材23の態様によらずに、フック部材22をロック位置P1とロック解除位置P2とに動かすことができる。したがって、ジブ14の保持と保持の解除とが切替え不能となるような状況の発生を低減できる。なお、上記の「第1操作部材23の態様」とは、作動部が様々な状態で固定された態様など、第1操作部材23の作動機構における様々な態様を意味し、ワイヤが第1操作部材23に絡まるなど、物理的な外乱が加わったことによる第1操作部材23の態様が含まれるものではない。
As described above, according to the crane 1 of this embodiment, the holding mechanism 20 that holds the jib 14 includes the first operating member 23 and the second operating member 24 that can move the hook member 22 . Further, the second operating member 24 moves the hook member 22 between the lock position P1 and the unlock position P2 regardless of the mode of the first operating member 23 when the first operating member 23 becomes inoperable. be able to. Therefore, it is possible to reduce the occurrence of a situation in which switching between holding and releasing the jib 14 becomes impossible. Note that the above-mentioned "mode of the first operating member 23" means various modes of the operating mechanism of the first operating member 23, such as modes in which the operating portion is fixed in various states. It does not include the aspect of the first operating member 23 due to physical disturbance such as entanglement with the member 23 .

さらに、本実施形態のクレーン1によれば、第1操作部材23は駆動により作動する構成であり、第2操作部材24は手動の力で作動する構成である。したがって、故障がなければ、第1操作部材23を利用することで、作業員の負荷を増大させずに、ジブ14の保持と保持の解除の切り替えを行うことができる。また、第2操作部材24を手動の力で作動する構成とすることで、第2操作部材24に不具合が生じる可能性を非常に低減でき、よって、ジブ14の保持と保持の解除とが切替え不能となるような状況の発生をより少なくできる。 Furthermore, according to the crane 1 of the present embodiment, the first operating member 23 is configured to be actuated by driving, and the second operating member 24 is configured to be manually actuated. Therefore, if there is no failure, the jib 14 can be held and released by using the first operating member 23 without increasing the load on the operator. In addition, by configuring the second operating member 24 to be manually operated, the possibility of malfunction of the second operating member 24 can be greatly reduced, so that holding and releasing of the jib 14 can be switched. Fewer disabling situations occur.

なお、本発明に係る第1操作部材及び第2操作部材は、両方が駆動により作動する構成であっても良いし、あるいは、両方が手動により作動する構成であっても良い。このような構成でも、2系統の操作部材があることで、ジブ14の保持と保持の解除とが切替え不能となるような状況を減らすことができる。 It should be noted that the first and second operating members according to the present invention may both be driven and actuated, or both may be manually actuated. Even with such a configuration, it is possible to reduce situations in which it is impossible to switch between holding the jib 14 and releasing the holding because there are two systems of operation members.

本実施形態のクレーン1によれば、さらに、第1操作部材23を支持する第1支持部材26を備え、第2操作部材24は、フック部材22を動かす際に、第1操作部材23を第1支持部材26から外すように構成される。第1操作部材23が第1支持部材26から外れることで、第1操作部材23がどのような作動状態で固まってしまった場合でも、第1操作部材23がフック部材22の動きに干渉しないようにできる。また、第2操作部材24がフック部材22を動かす際に、第1操作部材23が第1支持部材26から外れるので、第1操作部材23を第1支持部材26から外すために別の操作部を設けた場合と比較して、部品点数の削減、並びに、作業員による操作工程数の削減を図れる。 According to the crane 1 of the present embodiment, the first support member 26 that supports the first operating member 23 is further provided, and the second operating member 24 moves the first operating member 23 to the second position when the hook member 22 is moved. 1 support member 26. The first operating member 23 is removed from the first support member 26 so that the first operating member 23 does not interfere with the movement of the hook member 22 even if the first operating member 23 is stuck in any operating state. can be done. Further, when the second operating member 24 moves the hook member 22, the first operating member 23 is disengaged from the first supporting member 26. Therefore, in order to disengage the first operating member 23 from the first supporting member 26, another operating member is required. Compared to the case of providing , it is possible to reduce the number of parts and the number of operation steps by workers.

さらに、本実施形態よれば、第1支持部材26から外れた第1操作部材23を、別途支持する部材支持部27dを備える。したがって、第1操作部材23が第1支持部材26から外れた後でも、第1操作部材23の配置が安定し、第1操作部材23が他の部材に干渉することを抑制できる。 Furthermore, according to this embodiment, the member supporting portion 27d that separately supports the first operating member 23 detached from the first supporting member 26 is provided. Therefore, even after the first operating member 23 is detached from the first support member 26, the arrangement of the first operating member 23 is stabilized, and interference of the first operating member 23 with other members can be suppressed.

さらに、本実施形態よれば、部材支持部27dはフック部材22に取り付けられている。したがって、フック部材22が回動しても、第1操作部材23と部材支持部27dとの相対的な位置関係が大きく変わらない。したがって、第1支持部材26から外れた第1操作部材23を安定的に支持できる。 Furthermore, according to this embodiment, the member supporting portion 27d is attached to the hook member 22. As shown in FIG. Therefore, even if the hook member 22 rotates, the relative positional relationship between the first operating member 23 and the member support portion 27d does not change significantly. Therefore, the first operation member 23 detached from the first support member 26 can be stably supported.

さらに、本実施形態によれば、第2操作部材24をフック部材22に連結する連結部27bを有する部材と、部材支持部27dを有する部材とが、ユニット化されて、1つのステー27に収まっている。したがって、保持機構20の部品点数の削減を図ることができる。 Furthermore, according to the present embodiment, the member having the connecting portion 27b that connects the second operating member 24 to the hook member 22 and the member having the member supporting portion 27d are unitized into one stay 27. ing. Therefore, the number of parts of the holding mechanism 20 can be reduced.

さらに、本実施形態によれば、第2操作部材24の操作によるフック部材22の可動範囲W2は、第1操作部材23の操作(駆動)によるフック部材22の可動範囲W1よりも大きい。したがって、第1操作部材23が第1支持部材26から最も外れにくい作動状態で固まったときでも、第2操作部材24の操作によって、第1操作部材23を第1支持部材26から外すことができる。 Furthermore, according to the present embodiment, the movable range W2 of the hook member 22 by operating the second operating member 24 is larger than the movable range W1 of the hook member 22 by operating (driving) the first operating member 23 . Therefore, even when the first operating member 23 is frozen in an operating state in which it is most difficult to come off the first supporting member 26, the first operating member 23 can be removed from the first supporting member 26 by operating the second operating member 24. .

さらに、本実施形態によれば、第1操作部材23は電動アクチュエータである。したがって、ブーム13の途中に位置する保持機構20まで動力源(電力)を容易に送ることができる。さらに、第1操作部材23は、電力を供給しないと作動部が基部に対して拘束される電動アクチュエータである。このような構成では、電力が供給できなくなると第1操作部材23の作動部が基部に拘束される。しかし、本実施形態によれば、このような構成の第1操作部材23に電力が供給できなくなっても、第2操作部材24の操作によってフック部材22を動かせるので、特に有効である。なお、本発明に係る第1操作部材又は第2操作部材は、駆動により作動する構成である場合、電動の構成に限られず、油圧、液圧、エア圧により駆動する構成が採用されてもよい。 Furthermore, according to this embodiment, the first operating member 23 is an electric actuator. Therefore, the power source (electric power) can be easily sent to the holding mechanism 20 located in the middle of the boom 13 . Furthermore, the first operating member 23 is an electric actuator whose operating portion is restrained with respect to the base portion when electric power is not supplied. With such a configuration, the actuating portion of the first operating member 23 is restrained by the base portion when electric power cannot be supplied. However, according to this embodiment, the hook member 22 can be moved by operating the second operating member 24 even if power cannot be supplied to the first operating member 23 having such a configuration, which is particularly effective. In addition, when the first operation member or the second operation member according to the present invention is configured to be operated by driving, it is not limited to an electric configuration, and a configuration driven by hydraulic pressure, hydraulic pressure, or air pressure may be adopted. .

さらに、本実施形態によれば、第2操作部材24は、操作ロープ24aが接続されたアーム部材である。したがって、アーム部材による梃子の原理を利用して、比較的に小さな力でジブ14の保持又は保持を解除することができる。 Furthermore, according to this embodiment, the second operating member 24 is an arm member to which the operating rope 24a is connected. Therefore, using the principle of leverage by the arm member, the jib 14 can be held or released with a relatively small force.

以上、本発明の実施形態について説明した。しかし、本発明は上記の実施形態に限られない。例えば、上記実施形態では、クレーンがタワークレーンである場合を示したが、ブームとジブとを備えるクレーンであれば、その種類は限定されない。例えば、走行機能を有さない固定式のクレーンでもよい。また、上記実施形態では、フック部材22を、ジブを保持するロック位置と、ジブの保持を解除するロック解除位置とに移動可能なロック部材の一例として示した。しかし、例えば、ロック穴にロックピンを挿入することでジブが保持され、ロックピンを抜くことでジブの保持が解除される構成においては、ロック部材としてロックピンを適用できるなど、ロック部材は様々に変更可能である。すなわち、ロック部材は、ジブを保持するロック位置とジブの保持を解除するロック解除位置と移動可能であれば、どのような部材であってもよい。上記実施形態では、ロック部材を回動するフック部材とした例を示したが、ロック部材は並進移動する構成であってもよい。このような構成の場合、実施形態の説明においてフック部材はロック部材と読み替え、回動は移動と読み替えてもよい。その他、実施の形態で示した細部は、発明の趣旨を逸脱しない範囲で適宜変更可能である。 The embodiments of the present invention have been described above. However, the invention is not limited to the above embodiments. For example, in the above-described embodiment, the crane is a tower crane, but the type is not limited as long as the crane has a boom and a jib. For example, a stationary crane that does not have a travel function may be used. Further, in the above-described embodiment, the hook member 22 is shown as an example of a lock member that can move between the lock position for holding the jib and the unlock position for releasing the hold of the jib. However, for example, in a structure in which the jib is held by inserting a lock pin into the lock hole and released from holding by pulling out the lock pin, the lock pin can be used as the lock member. can be changed to That is, the locking member may be any member as long as it can move between a locked position for holding the jib and an unlocked position for releasing the holding of the jib. In the above embodiment, an example in which the lock member is a hook member that rotates is shown, but the lock member may be configured to move in translation. In the case of such a configuration, in the description of the embodiment, the hook member may be read as the lock member, and the rotation may be read as the movement. Other details shown in the embodiments can be changed as appropriate without departing from the scope of the invention.

1 クレーン
13 ブーム
14 ジブ
20 保持機構
21 ベース部材
22 フック部材(ロック部材)
22h フック部
22c カム部
22a 傾斜部
23 第1操作部材
24 第2操作部材
24a 操作ロープ
25 付勢部材
26 第1支持部材
27 ステー
27a 支持部
27b 連結部
27c 支持部
27d 部材支持部(第2支持部材)
31 バー
40 ロック検知装置
P1 ロック位置
P2 ロック解除位置
W1、W2 可動範囲
Reference Signs List 1 crane 13 boom 14 jib 20 holding mechanism 21 base member 22 hook member (lock member)
22h hook portion 22c cam portion 22a inclined portion 23 first operating member 24 second operating member 24a operating rope 25 biasing member 26 first supporting member 27 stay 27a supporting portion 27b connecting portion 27c supporting portion 27d member supporting portion (second supporting portion) Element)
31 Bar 40 Lock detector P1 Lock position P2 Unlock position W1, W2 Movable range

Claims (9)

ブームと、前記ブームに起伏可能に取り付けられたジブと、前記ブームに対して折り畳まれた状態の前記ジブを保持する保持機構とを備えるクレーンであって、
前記保持機構は、
前記ジブを保持するロック位置と前記ジブの保持を解除するロック解除位置とに移動可能なロック部材と、
自身の駆動によりあるいは外部から力を受けて、前記ロック部材を前記ロック位置と前記ロック解除位置とに動かす第1操作部材及び第2操作部材と、
を有し、
前記第2操作部材は、前記第1操作部材による前記ロック部材の前記ロック解除位置への移動が不能になった場合に、前記第1操作部材の態様によらずに前記ロック部材を前記ロック解除位置に動かすことが可能に構成される、
クレーン。
A crane comprising a boom, a jib hoistably attached to the boom, and a holding mechanism holding the jib in a folded state with respect to the boom,
The holding mechanism is
a locking member movable between a lock position for holding the jib and an unlock position for releasing the holding of the jib;
a first operating member and a second operating member for moving the locking member between the locking position and the unlocking position by being driven by itself or by receiving a force from the outside;
has
When the lock member cannot be moved to the unlock position by the first operation member, the second operation member is configured to operate the lock member to unlock regardless of the mode of the first operation member. configured to be movable into position,
crane.
前記第1操作部材は自身の駆動により作動し、
前記第2操作部材は手動の力で作動する、
請求項1記載のクレーン。
The first operating member is operated by its own drive,
the second operating member is actuated by manual force;
A crane according to claim 1.
前記第1操作部材を支持する第1支持部材を備え、
前記第2操作部材は、前記ロック部材を動かす際に、前記第1操作部材を前記第1支持部材から外すように構成される、
請求項1又は請求項2に記載のクレーン。
A first support member that supports the first operation member,
The second operating member is configured to disengage the first operating member from the first support member when moving the locking member.
A crane according to claim 1 or claim 2.
前記第1支持部材から外された状態の前記第1操作部材を更に支持する第2支持部材を備える、
請求項3記載のクレーン。
a second support member that further supports the first operation member in a state detached from the first support member;
A crane according to claim 3.
前記第2支持部材は前記ロック部材に取り付けられている、
請求項4記載のクレーン。
the second support member is attached to the locking member;
A crane according to claim 4.
前記第2操作部材の操作による前記ロック部材の可動範囲が、前記第1操作部材の操作による前記ロック部材の可動範囲よりも大きい、
請求項3から請求項5のいずれか一項に記載のクレーン。
a movable range of the lock member by operating the second operating member is larger than a movable range of the locking member by operating the first operating member;
A crane as claimed in any one of claims 3 to 5.
前記第1操作部材は、電動アクチュエータである、
請求項1から請求項6のいずれか一項に記載のクレーン。
The first operating member is an electric actuator,
A crane according to any one of claims 1 to 6.
前記第2操作部材は、ロープが接続されたアーム部材である、
請求項1から請求項7のいずれか一項に記載のクレーン。
The second operating member is an arm member to which a rope is connected,
A crane according to any one of claims 1 to 7.
前記ロープは電力又は信号を伝送するケーブルである、
請求項8記載のクレーン。
The rope is a cable that transmits power or signals,
A crane according to claim 8.
JP2021053307A 2021-03-26 2021-03-26 crane Pending JP2022150624A (en)

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JP2021053307A JP2022150624A (en) 2021-03-26 2021-03-26 crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2021053307A JP2022150624A (en) 2021-03-26 2021-03-26 crane

Publications (1)

Publication Number Publication Date
JP2022150624A true JP2022150624A (en) 2022-10-07

Family

ID=83464581

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Country Status (1)

Country Link
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