JP6870484B2

JP6870484B2 - Construction machinery

Info

Publication number: JP6870484B2
Application number: JP2017112405A
Authority: JP
Inventors: 小泉　幸雄; 幸雄小泉; 洋平小川; 健一中司; 松尾　洋平; 洋平松尾
Original assignee: Kobelco Construction Machinery Co Ltd
Current assignee: Kobelco Construction Machinery Co Ltd
Priority date: 2017-06-07
Filing date: 2017-06-07
Publication date: 2021-05-12
Anticipated expiration: 2037-06-07
Also published as: JP2018203487A

Description

本発明は、起伏可能なガントリを備えた建設機械に関する。 The present invention relates to a construction machine provided with an undulating gantry.

クレーンなどの建設機械は、一般に、下部走行体と、当該下部走行体の上方に配置される上部旋回体と、上部旋回体に起伏可能に支持されるブームと、を備える。更に、このような建設機械として、ブームの起伏動作において支柱として機能するガントリを備えたものが知られている。 A construction machine such as a crane generally includes a lower traveling body, an upper rotating body arranged above the lower traveling body, and a boom undulatingly supported by the upper rotating body. Further, as such a construction machine, a machine equipped with a gantry that functions as a support in the undulating operation of the boom is known.

ブームは、上部旋回体の前側部分に水平な軸回りに回動可能に支持されている。一方、ガントリは、上部旋回体の後側部分に配置されている。ガントリの先端部は、ガイラインを介してブームの先端部に接続されている。また、ガントリは、前側脚部と後側脚部とを備えている。前側脚部は、ブームの後方で、上部旋回体から後斜め上方に向かって延びている。後側脚部は、前側脚部の更に後方で上部旋回体から上方に向かって延びている。更に、後側脚部は、後上側部材と後下側部材とを備える。後上側部材の上端部は、前側脚部の上端部に回動可能に連結されている。後下側部材の下端部は上部旋回体に回動可能に支持されている。また、後上側部材の下端部と後下側部材の上端部とは互いに回動可能に連結されている。このような構成では、上部旋回体および前側脚部に接続された油圧シリンダの収縮に応じて前側脚部が後方に倒されると、後側脚部の後上側部材および後下側部材が前方に屈曲することで、ガントリが上部旋回体上に倒伏した姿勢となることができる。 The boom is rotatably supported around an axis horizontal to the front portion of the upper swing body. On the other hand, the gantry is arranged in the rear portion of the upper swivel body. The tip of the gantry is connected to the tip of the boom via a guy line. Further, the gantry includes a front leg portion and a rear leg portion. The front leg extends diagonally upward rearward from the upper swing body behind the boom. The rear leg extends upward from the upper swivel further behind the front leg. Further, the rear leg portion includes a rear upper member and a rear lower member. The upper end of the rear upper member is rotatably connected to the upper end of the front leg. The lower end of the rear lower member is rotatably supported by the upper swing body. Further, the lower end portion of the rear upper member and the upper end portion of the rear lower member are rotatably connected to each other. In such a configuration, when the front leg is tilted backward in response to the contraction of the hydraulic cylinder connected to the upper swing body and the front leg, the rear upper member and the rear lower member of the rear leg are moved forward. By bending, the gantry can be in a prone position on the upper swivel body.

特許文献１および２には、このようにガントリが起伏可能とされるクレーンが開示されている。これらの技術では、ガントリの後側脚部の後上側部材と後下側部材とが、固定ピンおよびスライドピンによって互いに連結されている。スライドピンは、後下側部材の上端部に開口された丸穴および後上側部材に開口された長穴に挿通されている。また、固定ピンは、後下側部材および後上側部材にそれぞれ開口された丸穴に挿通されている。ガントリが上部旋回体上に倒伏される際には、予め固定ピンが丸穴から脱離される。そして、油圧シリンダの収縮によってガントリの前側脚部が後方に倒されると、スライドピンが長穴内を移動しながら、後側脚部が屈曲する。 Patent Documents 1 and 2 disclose a crane in which the gantry can be undulated in this way. In these techniques, the rear upper member and the rear lower member of the rear leg of the gantry are connected to each other by a fixing pin and a slide pin. The slide pin is inserted into a round hole opened at the upper end of the rear lower member and a long hole opened at the rear upper member. Further, the fixing pin is inserted into a round hole opened in each of the rear lower member and the rear upper member. When the gantry falls down on the upper swing body, the fixing pin is detached from the round hole in advance. Then, when the front leg of the gantry is tilted backward due to the contraction of the hydraulic cylinder, the rear leg bends while the slide pin moves in the elongated hole.

特開２０００−１９８６７２号公報Japanese Unexamined Patent Publication No. 2000-198672 特開２０１１−３７６２８号公報Japanese Unexamined Patent Publication No. 2011-37628

特許文献１および２に記載された技術では、ガントリの倒伏動作に際して、予め固定ピンが丸穴から脱離される必要がある。固定ピンが挿通される丸穴は、後下側部材の上端部に位置するため、作業者は比較的高所での作業を行うこととなる。また、後上側部材および後下側部材の丸穴から固定ピンが引抜かれるためには、油圧シリンダの伸縮の微調整によって両丸穴の位置が調整される必要があり、作業に手間がかかるという問題があった。 In the techniques described in Patent Documents 1 and 2, the fixing pin needs to be detached from the round hole in advance when the gantry is laid down. Since the round hole through which the fixing pin is inserted is located at the upper end of the rear lower member, the operator will work at a relatively high place. Further, in order for the fixing pin to be pulled out from the round holes of the rear upper member and the rear lower member, it is necessary to adjust the positions of both round holes by finely adjusting the expansion and contraction of the hydraulic cylinder, which is troublesome. There was a problem.

本発明は、上記問題に鑑みてなされたものであり、ガントリの倒伏姿勢と起立姿勢との間での姿勢変更作業を容易に実行することが可能な建設機械を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a construction machine capable of easily performing a posture changing operation between a gantry's lying down posture and a standing posture.

従来の建設機械では、固定ピンおよびスライドピンによって、後下脚部および後上脚部が連結されていた。一方、本発明の発明者は、連結ピンが起立姿勢において後下脚部および後上脚部を連結するとともに、当該連結ピンが起立姿勢と倒伏姿勢との間の姿勢変更における支点となることができるような、連結ピンの配置があることを見出した。すなわち、本発明の一の局面に係る建設機械は、機体と、前記機体に起伏可能に支持された起伏部材と、前記起伏部材の後方で前記機体に対して起立した起立姿勢と前記機体上に倒伏した倒伏姿勢との間で姿勢変更可能なように前記機体に支持され、前記起伏部材の起伏動作において前記起伏部材を支持する支柱として機能するガントリと、前記機体に回動可能に連結される基端部と前記ガントリに連結される先端部とを備え、前記ガントリを前記起立姿勢と前記倒伏姿勢との間で姿勢変更させるように伸縮するガントリ起伏シリンダと、を備え、前記ガントリは、前記ガントリ起伏シリンダの伸縮に応じて前記起伏部材の後方において水平に延びる第１軸心回りに回動するように前記機体に支持された前脚部と、前記前脚部の後方で前記第１軸心と平行な第２軸心回りに回動するように前記機体に支持された後下脚部であって、当該後下脚部の回動端部に前記第２軸心と平行に延びる第１孔部が開口されている、後下脚部と、前記起立姿勢において前記前脚部が前記機体から後方かつ上方に延びるとともに前記後下脚部が上下方向に沿って延びるように前記前脚部と前記後下脚部とを接続する後上脚部であって、当該後上脚部は、前記第１軸心と平行な第３軸心回りに回動可能なように前記後下脚部の前記回動端部に接続された基端部と、前記第１軸心と平行な第４軸心回りに回動可能なように前記前脚部の先端部に接続された回動端部と、を有し、更に、前記後上脚部の前記基端部に前記第３軸心と平行に延びる第２孔部が開口されている、後上脚部と、前記後下脚部の前記第１孔部および前記後上脚部の前記第２孔部に挿通され前記第３軸心を形成する連結ピンと、を備え、前記第１孔部および前記第２孔部は、前記起立姿勢において前記連結ピンが前記後下脚部に対する前記後上脚部の上下方向の位置を規制するとともに、前記ガントリの前記起立姿勢から前記倒伏姿勢への姿勢変更において前記後下脚部および前記後上脚部が前記連結ピンを支点として前方に屈曲するとともに前記前脚部が前記機体上に倒伏することを前記連結ポンが許容するような位置にそれぞれ開口されている。 In conventional construction machines, the rear lower leg and the rear upper leg are connected by a fixing pin and a slide pin. On the other hand, the inventor of the present invention can connect the rear lower leg portion and the rear upper leg portion in the standing posture, and the connecting pin can serve as a fulcrum in changing the posture between the standing posture and the lying posture. I found that there is an arrangement of connecting pins like this. That is, the construction machine according to one aspect of the present invention includes the machine body, the undulating member undulatingly supported by the machine body, the standing posture standing behind the undulating member with respect to the machine body, and the machine body. It is supported by the machine body so that the posture can be changed between the laid down posture and the gantry that functions as a support column for supporting the undulating member in the undulating operation of the undulating member, and is rotatably connected to the machine body. The gantry includes a base end portion and a tip portion connected to the gantry, and a gantry undulating cylinder that expands and contracts the gantry so as to change its posture between the standing posture and the lying posture. A front leg portion supported by the machine body so as to rotate around a first axis center extending horizontally behind the undulation member according to expansion and contraction of the gantry undulation cylinder, and the first axis center behind the front leg portion. A rear lower leg portion supported by the machine body so as to rotate around a parallel second axis center, and a first hole portion extending parallel to the second axis center is provided at a rotating end portion of the rear lower leg portion. The rear lower leg portion that is open, and the front leg portion and the rear lower leg portion so that the front leg portion extends rearwardly and upwardly from the aircraft and the rear lower leg portion extends in the vertical direction in the standing posture. The rear upper leg portion to be connected, and the rear upper leg portion is connected to the rotating end portion of the rear lower leg portion so as to be rotatable around a third axis center parallel to the first axis center. It has a base end portion and a rotating end portion connected to the tip end portion of the front leg portion so as to be rotatable around the fourth axis center parallel to the first axis center, and further, the rear part. A second hole extending parallel to the third axis is opened at the base end of the upper leg, the rear upper leg, the first hole of the rear lower leg, and the rear upper leg. The first hole and the second hole are provided with a connecting pin that is inserted into the second hole to form the third axis, and the connecting pin is attached to the rear lower leg in the standing posture. The position of the rear upper leg in the vertical direction is restricted, and the rear lower leg and the rear upper leg bend forward with the connecting pin as a fulcrum when the posture of the gantry is changed from the standing posture to the lying posture. At the same time, the front legs are opened at positions where the connecting pons allow the front legs to lie down on the machine body.

本構成によれば、ガントリが、ガントリ起伏シリンダの伸縮に応じて起立姿勢と倒伏姿勢との間で姿勢変更可能とされる。このため、建設機械の輸送時には、ガントリが倒伏姿勢とされることで、機体およびガントリの輸送性が向上する。また、連結ピンは、ガントリの起立姿勢において後下脚部に対する後上脚部の上下方向の位置を規制する。更に、連結ピンは、ガントリが姿勢変更することを、第２軸心と第３軸心との距離と第３軸心と第４軸心との距離との比を一定に保持しながら許容する。この結果、連結ピンは、ガントリの起立姿勢および倒伏姿勢のいずれの姿勢においても、第１孔部および第２孔部に挿通された状態とされるため、ガントリの姿勢変更に際して、第１孔部および第２孔部から連結ピンが脱離される必要がない。このため、作業者は、連結ピンの着脱のために機体よりも高い位置で作業をする必要がなく、ガントリの姿勢変更を従来よりも容易に実行することができる。 According to this configuration, the gantry can change its posture between the standing posture and the lying posture according to the expansion and contraction of the gantry undulating cylinder. For this reason, when the construction machine is transported, the gantry is placed in a prone position, so that the transportability of the aircraft and the gantry is improved. Further, the connecting pin regulates the vertical position of the rear upper leg portion with respect to the rear lower leg portion in the standing posture of the gantry. Further, the connecting pin allows the gantry to change its posture while maintaining a constant ratio between the distance between the second axis and the third axis and the distance between the third axis and the fourth axis. .. As a result, the connecting pin is inserted into the first hole and the second hole in both the standing posture and the lying posture of the gantry. Therefore, when the posture of the gantry is changed, the first hole portion is inserted. And the connecting pin does not need to be detached from the second hole. Therefore, the operator does not need to work at a position higher than the machine body to attach / detach the connecting pin, and the posture of the gantry can be changed more easily than before.

上記の構成において、前記後下脚部は、前記第２軸心よりも下方に配置された第１被連結部を有し、前記機体は、前記第１被連結部よりも下方に配置された第２被連結部を有し、前記第１被連結部と前記第２被連結部とを連結する連結状態と、前記第１被連結部および前記第２被連結部のうちの少なくとも一方から脱離されることで前記連結を解除する非連結状態との間で状態変更が可能な起立用連結部材であって、前記連結状態において前記後上脚部および前記後下脚部が前記連結ピンを支点として屈曲することを規制する、起立用連結部材を更に備えるものでもよい。 In the above configuration, the rear lower leg portion has a first connected portion arranged below the second axial center, and the airframe is arranged below the first connected portion. It has two connected portions, and is detached from the connected state in which the first connected portion and the second connected portion are connected, and at least one of the first connected portion and the second connected portion. It is an upright connecting member whose state can be changed from the non-connected state in which the connection is released, and in the connected state, the rear upper leg portion and the rear lower leg portion are bent with the connecting pin as a fulcrum. It may be further provided with an upright connecting member that regulates the operation.

本構成によれば、ガントリの起立姿勢において、起立用連結部材が後下脚部を機体に固定することで、後下脚部および後上脚部の屈曲が規制される。このため、ガントリを起立姿勢に安定して保持することができる。 According to this configuration, in the standing posture of the gantry, the standing connecting member fixes the rear lower leg portion to the airframe, thereby restricting the bending of the rear lower leg portion and the rear upper leg portion. Therefore, the gantry can be stably held in the standing posture.

上記の構成において、前記後上脚部および前記後下脚部のうちの少なくとも一方に当接可能とされ、前記ガントリの前記起立姿勢から前記倒伏姿勢への姿勢変更において、前記後上脚部および前記後下脚部が前記連結ピンを支点として後方に屈曲することを規制するストッパを更に備えるものでもよい。 In the above configuration, the rear upper leg portion and the rear lower leg portion can be brought into contact with at least one of the rear upper leg portion and the rear upper leg portion and the rear upper leg portion and the rear upper leg portion when the posture of the gantry is changed from the standing posture to the lying posture. Further, a stopper for restricting the rear lower leg portion from bending backward with the connecting pin as a fulcrum may be further provided.

本構成によれば、ガントリの起立姿勢から倒伏姿勢への姿勢変更に際して、後上脚部および後下脚部が後方に屈曲することが防止される。このため、ガントリの姿勢変更が安定して実現される。 According to this configuration, when the posture of the gantry is changed from the standing posture to the lying posture, the rear upper leg portion and the rear lower leg portion are prevented from bending backward. Therefore, the posture change of the gantry is stably realized.

上記の構成において、前記後上脚部および前記後下脚部のうちの少なくとも一方の脚部に当接可能とされ、前記ガントリの前記起立姿勢から前記倒伏姿勢への姿勢変更において、前記後上脚部および前記後下脚部が前記連結ピンを支点として前方に屈曲するように、前記少なくとも一方の脚部を付勢する付勢部材を更に備えるものでもよい。 In the above configuration, the rear upper leg can be brought into contact with at least one of the rear upper leg and the rear lower leg, and the rear upper leg is changed from the standing posture to the lying posture of the gantry. An urging member for urging at least one leg portion may be further provided so that the portion and the rear lower leg portion bend forward with the connecting pin as a fulcrum.

本構成によれば、ガントリの起立姿勢から倒伏姿勢への姿勢変更に際して、後上脚部および後下脚部が前方に屈曲することが促進される。このため、ガントリの姿勢変更がスムーズに実現される。 According to this configuration, when the posture of the gantry is changed from the standing posture to the lying posture, the rear upper leg portion and the rear lower leg portion are promoted to bend forward. Therefore, the posture of the gantry can be changed smoothly.

上記の構成において、前記ガントリの前記倒伏姿勢において前記前脚部のうち前記第１軸心と前記第４軸心との間の部分と前記機体とを連結する、倒伏用連結部材を更に備えるものでもよい。 In the above configuration, even if the gantry is further provided with a lodging connecting member for connecting a portion of the front leg portion between the first axis and the fourth axis and the machine body in the lying posture of the gantry. Good.

本構成によれば、ガントリの倒伏姿勢において、機体と前脚部とを連結することができる。このため、ガントリを倒伏姿勢に安定して保持することができる。 According to this configuration, the airframe and the front legs can be connected in the prone position of the gantry. Therefore, the gantry can be stably held in the prone position.

上記の構成において、前記後下脚部は、前記第２軸心よりも下方に配置された第１被連結部を有し、前記機体は、前記第１被連結部よりも下方に配置された第２被連結部を有し、前記前脚部は、前記第１軸心と前記第４軸心との間に配置される第３被連結部を有し、前記第１被連結部と前記第２被連結部とを連結することで前記ガントリを前記起立姿勢に保持する起立連結状態と、前記第２被連結部と前記第３被連結部とを連結することで前記ガントリを前記倒伏姿勢に保持する倒伏連結状態と、前記第１被連結部、前記第２被連結部および前記第３被連結部のうちの少なくとも一の連結部から脱離されることで前記後上脚部および前記後下脚部が前記連結ピンを支点として屈伸し前記ガントリが前記起立姿勢と前記倒伏姿勢との間で姿勢変更することを許容する非連結状態と、の間で状態変更が可能な連結部材を更に備えるものでもよい。 In the above configuration, the rear lower leg portion has a first connected portion arranged below the second axial center, and the airframe is arranged below the first connected portion. The front leg portion has two connected portions, and the front leg portion has a third connected portion arranged between the first axial center and the fourth axial center, and the first connected portion and the second connected portion. The gantry is held in the standing posture by connecting the connected portion, and the gantry is held in the lying posture by connecting the second connected portion and the third connected portion. The rear upper leg portion and the rear lower leg portion are separated from the first connected portion, the second connected portion, and at least one of the third connected portions. Further includes a connecting member capable of changing the state between a non-connected state in which the gantry bends and stretches with the connecting pin as a fulcrum and allows the gantry to change its posture between the standing posture and the lying posture. Good.

本構成によれば、ガントリの起立姿勢において、起立用連結部材が後下脚部を機体に固定することで、後下脚部および後上脚部の屈曲が規制される。このため、ガントリを起立姿勢に安定して保持することができる。また、本構成によれば、ガントリの倒伏姿勢において、機体と前脚部とを連結することができる。このため、ガントリを倒伏姿勢に安定して保持することができる。更に、起立姿勢および倒伏姿勢において、連結部材を共用することができるため、建設機械のコストが低減される。 According to this configuration, in the standing posture of the gantry, the standing connecting member fixes the rear lower leg portion to the airframe, thereby restricting the bending of the rear lower leg portion and the rear upper leg portion. Therefore, the gantry can be stably held in the standing posture. Further, according to this configuration, the airframe and the front legs can be connected in the gantry's lying down posture. Therefore, the gantry can be stably held in the prone position. Further, since the connecting member can be shared in the standing posture and the lying posture, the cost of the construction machine is reduced.

本発明によれば、ガントリの倒伏姿勢と起立姿勢との間での姿勢変更作業を容易に実行することが可能な建設機械が提供される。 According to the present invention, there is provided a construction machine capable of easily performing a posture changing operation between a gantry's lying down posture and an standing posture.

本発明の一実施形態に係るクレーンの側面図である。It is a side view of the crane which concerns on one Embodiment of this invention. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して起立姿勢とされた状態の側面図である。FIG. 5 is a side view of a crane according to an embodiment of the present invention in a state where the gantry is in an upright posture with respect to the airframe. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して起立姿勢から倒伏姿勢に姿勢変更する状態の側面図である。FIG. 5 is a side view of a state in which the gantry changes its posture from a standing posture to a lying posture with respect to the airframe in the crane according to the embodiment of the present invention. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して倒伏姿勢とされた状態の側面図である。FIG. 5 is a side view of a crane according to an embodiment of the present invention in a state where the gantry is in a prone position with respect to the airframe. 本発明の一実施形態に係るクレーンにおいて、ガントリの起立姿勢および倒伏姿勢を示す側面図である。It is a side view which shows the standing posture and the lying posture of a gantry in the crane which concerns on one Embodiment of this invention. 本発明の一実施形態に係るクレーンにおいて、ガントリのストッパおよび付勢部材を拡大した側面図である。It is an enlarged side view of the stopper and the urging member of the gantry in the crane which concerns on one Embodiment of this invention. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して起立姿勢とされた状態の背面図である。It is a rear view of the crane which concerns on one Embodiment of this invention in the state which the gantry is in the standing posture with respect to the airframe. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して倒伏姿勢とされた状態の背面図である。It is a rear view of the crane which concerns on one Embodiment of this invention in the state which the gantry is in a lying posture with respect to an airframe. 本発明の一実施形態に係るクレーンにおいて、ガントリが機体に対して起立姿勢から倒伏姿勢に姿勢変更する軌跡を示した側面図である。It is a side view which showed the locus which the gantry changes the posture from the standing posture to the lying posture with respect to the body in the crane which concerns on one Embodiment of this invention. 本発明の一実施形態に係るクレーンにおいて、連結ピンの配置が決定されるための側面図である。It is a side view for determining the arrangement of the connecting pin in the crane which concerns on one Embodiment of this invention. 本発明の一実施形態に係るクレーンにおいて、連結ピンの配置が決定されるための側面図である。It is a side view for determining the arrangement of the connecting pin in the crane which concerns on one Embodiment of this invention.

以下、図面を参照しつつ、本発明の一実施形態について説明する。図１は、本実施形態に係るクレーン（建設機械）の側面図である。なお、図１には、「上」、「下」、「前」および「後」の方向が示されているが、当該方向は、本実施形態に係るクレーン１の構造を説明するために便宜上示すものであり、本発明に係るクレーンの使用態様などを限定するものではない。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a crane (construction machine) according to the present embodiment. In addition, although the directions of "up", "down", "front" and "rear" are shown in FIG. 1, the directions are for convenience to explain the structure of the crane 1 according to the present embodiment. It is shown, and does not limit the usage mode of the crane according to the present invention.

クレーンは、地面上で走行可能な下部走行体１（機体）と、下部走行体１の上方に配置される上部旋回体２（機体）と、起伏部材としてのブーム３と、を備える。なお、上部旋回体２の前端部には、キャブが備えられている。キャブは、クレーンの運転席に相当する。上部旋回体２は、上下方向に延びる旋回中心ＣＬ（図２）回りに旋回可能なように下部走行体１に搭載されている。上部旋回体２は、基台としての旋回フレーム２１を備える。 The crane includes a lower traveling body 1 (airframe) capable of traveling on the ground, an upper rotating body 2 (airframe) arranged above the lower traveling body 1, and a boom 3 as an undulating member. A cab is provided at the front end of the upper swing body 2. The cab corresponds to the driver's seat of the crane. The upper turning body 2 is mounted on the lower traveling body 1 so as to be able to turn around the turning center CL (FIG. 2) extending in the vertical direction. The upper swivel body 2 includes a swivel frame 21 as a base.

ブーム３は、上部旋回体２の旋回フレーム２１に起伏可能に支持されている。 The boom 3 is undulatingly supported by the swivel frame 21 of the upper swivel body 2.

クレーンは、ガントリ４と、カウンタウエイト５と、ブームガイライン６と、上部スプレッダ７と、下部スプレッダ８と、ブーム起伏ロープ９と、ブーム起伏ウインチ１０と、ブームポイントシーブ１１と、アイドラシーブ１２と、フック１３と、巻上げロープ１４と、巻上げドラム１５と、を更に備える。 The cranes are a gantry 4, a counterweight 5, a boom guy line 6, an upper spreader 7, a lower spreader 8, a boom undulating rope 9, a boom undulating winch 10, a boom point sheave 11, an idler sheave 12, and so on. A hook 13, a hoisting rope 14, and a hoisting drum 15 are further provided.

ガントリ４は、上部旋回体２の旋回フレーム２１の後部に装着されている。詳しくは、ガントリ４は、ブーム３の後方で旋回フレーム２１に支持され、ブーム３の起伏動作においてブーム３を支持する支柱として機能する。 The gantry 4 is mounted on the rear portion of the swivel frame 21 of the upper swivel body 2. Specifically, the gantry 4 is supported by the swivel frame 21 behind the boom 3 and functions as a support column for supporting the boom 3 in the undulating operation of the boom 3.

カウンタウエイト５は、ガントリ４の後方で旋回フレーム２１に装着されており、クレーンが吊り荷を吊りあげる際にクレーンのバランスを保つ機能を備えている。 The counterweight 5 is mounted on the swivel frame 21 behind the gantry 4 and has a function of maintaining the balance of the crane when the crane lifts a suspended load.

上部スプレッダ７および下部スプレッダ８は、それぞれ複数のシーブからなる。また、上部スプレッダ７は、ブームガイライン６によってブーム３の先端部に接続されている。
ブーム起伏ロープ９は、ブーム起伏ウインチ１０から引き出され、ガントリ４の先端部の不図示のシーブに掛けられた後、下部スプレッダ８と上部スプレッダ７との間で複数回掛け回される。ブーム起伏ウインチ１０は、旋回フレーム２１の後部に配置される。なお、引き出されたブーム起伏ロープ９の先端は、ガントリ４に固定される。ブーム起伏ウインチ１０は、ブーム起伏ロープ９の巻き取りおよび繰り出しを行うことで、上部スプレッダ７と下部スプレッダ８との間の距離を変化させ、ブーム３をガントリ４に対して相対的に回動させながらブーム１３を起伏させる。 The upper spreader 7 and the lower spreader 8 each consist of a plurality of sheaves. Further, the upper spreader 7 is connected to the tip end portion of the boom 3 by a boom guy line 6.
The boom undulating rope 9 is pulled out from the boom undulating winch 10, hung on a sheave (not shown) at the tip of the gantry 4, and then hung a plurality of times between the lower spreader 8 and the upper spreader 7. The boom undulating winch 10 is arranged at the rear of the swivel frame 21. The tip of the pulled out boom undulating rope 9 is fixed to the gantry 4. The boom undulation winch 10 changes the distance between the upper spreader 7 and the lower spreader 8 by winding and feeding the boom undulation rope 9, and rotates the boom 3 relative to the gantry 4. While undulating the boom 13.

巻上げドラム１５は、旋回フレーム２１の中央部に備え付けられている。また、ブームポイントシーブ１１およびアイドラシーブ１２は、ブーム３の先端部に回転自在に支持されている。巻上げドラム１５から引き出された巻上げロープ１４の先端部には、吊荷用のフック１３が備え付けられる。そして、巻上げロープ１４の一端は、ブーム３の先端部のブームポイントシーブ１１と、フック１３に設けられた不図示のシーブブロックのシーブとの間に掛け回された後、ブーム３の先端部に固定される。一方、巻上げロープ１４の他端は、ブームポイントシーブ１１、アイドラシーブ１２を経由して巻上げドラム１５に巻きつけられている。従って、巻上げドラム１５が巻上げロープ１４の巻き取りや繰り出しを行うと、ブームポイントシーブ１１とフック１３のシーブとの間の距離が変わって、ブーム３の先端部から垂下されたフック１３の巻上げ及び巻下げが行われる。 The winding drum 15 is provided in the central portion of the swivel frame 21. Further, the boom point sheave 11 and the idler sheave 12 are rotatably supported by the tip end portion of the boom 3. A hook 13 for suspending is provided at the tip of the hoisting rope 14 pulled out from the hoisting drum 15. Then, one end of the hoisting rope 14 is hung between the boom point sheave 11 at the tip of the boom 3 and the sheave of the sheave block (not shown) provided on the hook 13, and then is hung on the tip of the boom 3. It is fixed. On the other hand, the other end of the hoisting rope 14 is wound around the hoisting drum 15 via the boom point sheave 11 and the idler sheave 12. Therefore, when the hoisting drum 15 winds up or unwinds the hoisting rope 14, the distance between the boom point sheave 11 and the sheave of the hook 13 changes, and the hook 13 hanging from the tip of the boom 3 is hoisted and unwound. The winding is done.

次に、図２乃至図８を参照して、本実施形態に係るガントリ４の構造について説明する。図２は、本実施形態に係るクレーンにおいて、ガントリ４が上部旋回体２に対して起立姿勢とされた状態の側面図である。図３は、ガントリ４が上部旋回体２に対して起立姿勢から倒伏姿勢に姿勢変更する状態の側面図である。図４は、ガントリ４が上部旋回体２に対して倒伏姿勢とされた状態の側面図である。図５は、ガントリ４の起立姿勢および倒伏姿勢を重ねて示す側面図であり、起立姿勢のガントリ４が実線、倒伏姿勢のガントリ４が破線でそれぞれ示されている。図６は、ガントリ４の後記のストッパ２６およびコイルばね２６Ｂを拡大した側面図である。図７は、ガントリ４が上部旋回体２に対して起立姿勢とされた状態の背面図である。更に、図８は、ガントリ４が上部旋回体２に対して倒伏姿勢とされた状態の背面図である。 Next, the structure of the gantry 4 according to the present embodiment will be described with reference to FIGS. 2 to 8. FIG. 2 is a side view of the crane according to the present embodiment in a state in which the gantry 4 is in an upright posture with respect to the upper swing body 2. FIG. 3 is a side view of a state in which the gantry 4 changes its posture from the standing posture to the lying posture with respect to the upper swinging body 2. FIG. 4 is a side view of the gantry 4 in a prone position with respect to the upper swing body 2. FIG. 5 is a side view showing the standing posture and the lying posture of the gantry 4 in an overlapping manner, and the gantry 4 in the standing posture is shown by a solid line and the gantry 4 in the lying posture is shown by a broken line. FIG. 6 is an enlarged side view of the stopper 26 and the coil spring 26B described later of the gantry 4. FIG. 7 is a rear view of the gantry 4 in an upright posture with respect to the upper swing body 2. Further, FIG. 8 is a rear view of the gantry 4 in a prone position with respect to the upper swing body 2.

上部旋回体２の旋回フレーム２１は、一対の側壁部２２（図７）と、水平に延びる底面部２３と、一対のブラケット２８（第２被連結部）と、を有する。底面部２３は、平面視で略矩形形状を備えている。一対の側壁部２２は、底面部２３の左右両端部から上方に向かって立設されており、前後方向に延びている。前述のブーム起伏ウインチ１０および巻上げドラム１５は、一対の側壁部２２または底面部２３に不図示のブラケットなどを介して支持されている。本実施形態では、ブーム起伏ウインチ１０および巻上げドラム１５の回転軸は、左右方向と平行に延びている。 The swivel frame 21 of the upper swivel body 2 has a pair of side wall portions 22 (FIG. 7), a horizontally extending bottom surface portion 23, and a pair of brackets 28 (second connected portion). The bottom surface portion 23 has a substantially rectangular shape in a plan view. The pair of side wall portions 22 are erected upward from the left and right end portions of the bottom surface portion 23, and extend in the front-rear direction. The boom undulating winch 10 and the hoisting drum 15 described above are supported by a pair of side wall portions 22 or bottom surface portions 23 via brackets (not shown) or the like. In the present embodiment, the rotation axes of the boom undulating winch 10 and the hoisting drum 15 extend parallel to the left-right direction.

一対のブラケット２８は、底面部２３の後端部に配置されている。図７に示すように、一対のブラケット２８は、左右方向に間隔をおいて配置され、それぞれ、後記の一対の後下側脚部４３の下方にそれぞれ位置する。ブラケット２８には、取付孔２８Ａ（図７）が開口されている。取付孔２８Ａには、後記の連結具４５の下側ハッカー４５Ｂが係止される。 The pair of brackets 28 are arranged at the rear end of the bottom surface 23. As shown in FIG. 7, the pair of brackets 28 are arranged at intervals in the left-right direction, and are respectively located below the pair of rear lower leg portions 43 described later. A mounting hole 28A (FIG. 7) is opened in the bracket 28. The lower hacker 45B of the connector 45 described later is locked in the mounting hole 28A.

ガントリ４は、左右一対の前側脚部４１（前脚部）と、左右一対の後上側脚部４２（後上脚部）と、左右一対の後下側脚部４３（後下脚部）と、を有する（図２）。 The gantry 4 includes a pair of left and right front legs 41 (front legs), a pair of left and right rear upper legs 42 (rear upper legs), and a pair of left and right rear lower legs 43 (rear lower legs). Has (Fig. 2).

一対の前側脚部４１は、左右方向に間隔をおいて配置されており、それぞれ、一対の側壁部２２に支軸２４（第１軸心）回りに回動可能に支持されている。支軸２４は、左右方向に沿って水平に延びている。また、一対の前側脚部４１は、ブーム３の後方に配置されている。 The pair of front leg portions 41 are arranged at intervals in the left-right direction, and are rotatably supported by the pair of side wall portions 22 around a support shaft 24 (first axis). The support shaft 24 extends horizontally along the left-right direction. Further, the pair of front leg portions 41 are arranged behind the boom 3.

一対の前側脚部４１は、それぞれ、連結部３３と、連結ブラケット４１Ａ（第３被連結部）と、当接ブラケット４１Ｃと、緩衝材４１Ｄと、を備える。連結部３３は、前側脚部４１の上端部に固定されている。連結部３３は、側面視で略三角形状を備えている。連結部３３は、連結軸３４を備える。連結軸３４は、連結部３３の上端部（ガントリ４の頂部）に配置され、左右方向に沿って延びる軸部である。連結軸３４には、前述の下部スプレッダ８が回動可能に取り付けられる。 The pair of front leg portions 41 include a connecting portion 33, a connecting bracket 41A (third connected portion), a contact bracket 41C, and a cushioning material 41D, respectively. The connecting portion 33 is fixed to the upper end portion of the front leg portion 41. The connecting portion 33 has a substantially triangular shape when viewed from the side. The connecting portion 33 includes a connecting shaft 34. The connecting shaft 34 is a shaft portion that is arranged at the upper end portion (top portion of the gantry 4) of the connecting portion 33 and extends in the left-right direction. The lower spreader 8 described above is rotatably attached to the connecting shaft 34.

連結ブラケット４１Ａは、前側脚部４１の長手方向の中央部よりもやや先端側において、後上側脚部４２に向かって突出するように前側脚部４１の本体部分に固定されている。連結ブラケット４１Ａには、取付孔４１Ｂが開口されている。当接ブラケット４１Ｃは、連結ブラケット４１Ａよりも僅かに前側脚部４１の基端側において、後上側脚部４２に向かって突出するように前側脚部４１の本体部分に固定されている。なお、図２に示すように、当接ブラケット４１Ｃの突出高さは、連結ブラケット４１Ａの突出高さよりも小さい。当接ブラケット４１Ｃは、略直方体形状を備えている。緩衝材４１Ｄは、当接ブラケット４１Ｃの先端面に固定されている。緩衝材４１Ｄは、弾性材料で構成されている。 The connecting bracket 41A is fixed to the main body portion of the front leg portion 41 so as to project toward the rear upper leg portion 42 at the tip side slightly from the central portion in the longitudinal direction of the front leg portion 41. A mounting hole 41B is opened in the connecting bracket 41A. The abutting bracket 41C is fixed to the main body of the front leg 41 so as to project toward the rear upper leg 42 on the base end side of the front leg 41 slightly more than the connecting bracket 41A. As shown in FIG. 2, the protruding height of the contact bracket 41C is smaller than the protruding height of the connecting bracket 41A. The contact bracket 41C has a substantially rectangular parallelepiped shape. The cushioning material 41D is fixed to the tip surface of the contact bracket 41C. The cushioning material 41D is made of an elastic material.

一対の後上側脚部４２は、それぞれ、前側脚部４１と後下側脚部４３とを接続する。一対の後上側脚部４２は、それぞれ、下端部４２Ａ（基端部）と、上端部４２Ｂ（回動端部）と、を有する。下端部４２Ａは、支軸２４と平行な軸心（第３軸心）回りに回動可能なように後下側脚部４３に接続される。当該後上側脚部４２の下端部４２Ａには、支軸２４と平行に延びる孔部４２Ｈ（第２孔部）（図７）が開口されている。孔部４２Ｈには、連結ピン４６が装着される。そして、この連結ピン４６が、上記の後上側脚部４２Ａの軸心（第３軸心）を形成する。上端部４２Ｂは、支軸２４と平行な支軸４７（第４軸心）回りに回動可能なように前側脚部４１の連結部３３に接続されている。なお、前述の連結ブラケット４１Ａは、図２に示すように、上記の支軸４７と支軸２４との間に位置している。 The pair of rear upper leg portions 42 connect the front side leg portion 41 and the rear lower side leg portion 43, respectively. The pair of rear upper leg portions 42 have a lower end portion 42A (base end portion) and an upper end portion 42B (rotating end portion), respectively. The lower end portion 42A is connected to the rear lower leg portion 43 so as to be rotatable around an axis (third axis) parallel to the support shaft 24. A hole 42H (second hole) (FIG. 7) extending in parallel with the support shaft 24 is opened in the lower end 42A of the rear upper leg 42. A connecting pin 46 is attached to the hole 42H. Then, the connecting pin 46 forms the axial center (third axial center) of the rear upper leg portion 42A. The upper end portion 42B is connected to the connecting portion 33 of the front leg portion 41 so as to be rotatable around the support shaft 47 (fourth axis) parallel to the support shaft 24. As shown in FIG. 2, the connection bracket 41A described above is located between the support shaft 47 and the support shaft 24.

一対の後下側脚部４３は、左右方向に間隔をおいて配置されており、それぞれ、前側脚部４１の後方で一対の側壁部２２に支軸２４と平行な支軸２５（第２軸心）回りに回動可能に支持されている。なお、一対の後下側脚部４３の上端部には、それぞれ、支軸２４と平行に延びるように孔部４３Ｈ（第１孔部）が開口されている（図７）。孔部４３Ｈには、連結ピン４６が装着される。 The pair of rear lower leg portions 43 are arranged at intervals in the left-right direction, and the support shaft 25 (second axis) parallel to the support shaft 24 on the pair of side wall portions 22 behind the front side leg portion 41, respectively. It is rotatably supported around the center). A hole 43H (first hole) is opened at the upper end of the pair of rear lower leg 43s so as to extend in parallel with the support shaft 24 (FIG. 7). A connecting pin 46 is attached to the hole 43H.

図７を参照して、一対の後下側脚部４３は、それぞれ、外側板４３Ａと、内側板４３Ｃと、を有する。換言すれば、一対の後下側脚部４３は、それぞれ一対の板状部材によって構成されている。図７に示すように、外側板４３Ａは、後下側脚部４３の左右方向の外側に位置し、上下方向に延びている。同様に、内側板４３Ｃは、後下側脚部４３の左右方向の内側に位置し、上下方向に延びている。外側板４３Ａおよび内側板４３Ｃの上端部には、前述の孔部４３Ｈがそれぞれ開口されている。また、外側板４３Ａおよび内側板４３Ｃに、前述の後上側脚部４２が挟まれるように配置されている。 With reference to FIG. 7, the pair of rear lower leg portions 43 have an outer plate 43A and an inner plate 43C, respectively. In other words, each of the pair of rear lower leg portions 43 is composed of a pair of plate-shaped members. As shown in FIG. 7, the outer plate 43A is located outside the rear lower leg portion 43 in the left-right direction and extends in the vertical direction. Similarly, the inner plate 43C is located inside the rear lower leg portion 43 in the left-right direction and extends in the up-down direction. The above-mentioned holes 43H are opened at the upper ends of the outer plate 43A and the inner plate 43C, respectively. Further, the rear upper leg portion 42 is arranged so as to be sandwiched between the outer plate 43A and the inner plate 43C.

外側板４３Ａは、外側突出部４３Ｂを備える（図６、図７）。外側突出部４３Ｂは、外側板４３Ａの下端部の後側が、支軸２５よりも下方に長く延びた部分である（図６）。外側突出部４３Ｂは、後記のストッパ２６の緩衝材２６Ａに当接可能とされる。 The outer plate 43A includes an outer protrusion 43B (FIGS. 6 and 7). The outer protruding portion 43B is a portion in which the rear side of the lower end portion of the outer plate 43A extends downward longer than the support shaft 25 (FIG. 6). The outer protrusion 43B can come into contact with the cushioning material 26A of the stopper 26 described later.

また、内側板４３Ｃは、内側突出部４３Ｄ（第１被連結部）を有する（図６、図７）。内側突出部４３Ｄは、内側板４３Ｃの下端部が、支軸２５よりも後方かつ下方に長く延びた部分である。内側突出部４３Ｄには、取付孔４３Ｅが開口されている（図６）。取付孔４３Ｅには、後述の連結具４５の上側ハッカー４５Ａが係止される。なお、前述のブラケット２８（図７）は、後下側脚部４３の内側突出部４３Ｄよりも下方に配置されている（図７）。 Further, the inner plate 43C has an inner protruding portion 43D (first connected portion) (FIGS. 6 and 7). The inner protruding portion 43D is a portion in which the lower end portion of the inner plate 43C extends rearward and downward longer than the support shaft 25. A mounting hole 43E is opened in the inner protruding portion 43D (FIG. 6). The upper hacker 45A of the connector 45, which will be described later, is locked in the mounting hole 43E. The bracket 28 (FIG. 7) described above is arranged below the medial protrusion 43D of the rear lower leg portion 43 (FIG. 7).

更に、クレーンは、左右一対の油圧シリンダ４４（ガントリ起伏シリンダ）（図２）と、左右一対の連結具４５（起立用連結部材、倒伏用連結部材、連結部材）と、左右一対の連結ピン４６と、左右一対のストッパ２６と、を備える。 Further, the crane includes a pair of left and right hydraulic cylinders 44 (gantry undulating cylinders) (FIG. 2), a pair of left and right connecting tools 45 (standing connecting member, laying connecting member, connecting member), and a pair of left and right connecting pins 46. And a pair of left and right stoppers 26.

左右一対の油圧シリンダ４４（図２）は、旋回フレーム２１に回動可能に連結される基端部と、ガントリ４の前側脚部４１に連結される先端部とを備える。なお、図２乃至図５では、旋回フレーム２１のうち油圧シリンダ４４の基端部が連結される部分の図示を省略している。また、油圧シリンダ４４は、クレーンが備える不図示の油圧ポンプから供給される作動油を受け入れ、伸縮する。この際、油圧シリンダ４４は、ガントリ４が上部旋回体２に対して起立した起立姿勢とガントリ４が上部旋回体２上に倒伏した倒伏姿勢との間でガントリ４を姿勢変更させるように伸縮する（図２乃至図５参照）。 The pair of left and right hydraulic cylinders 44 (FIG. 2) include a base end portion rotatably connected to the swivel frame 21 and a tip end portion connected to the front leg portion 41 of the gantry 4. In addition, in FIGS. 2 to 5, the portion of the swivel frame 21 to which the base end portion of the hydraulic cylinder 44 is connected is omitted. Further, the hydraulic cylinder 44 receives hydraulic oil supplied from a hydraulic pump (not shown) included in the crane and expands and contracts. At this time, the hydraulic cylinder 44 expands and contracts so as to change the posture of the gantry 4 between the standing posture in which the gantry 4 stands up with respect to the upper swinging body 2 and the lying posture in which the gantry 4 falls down on the upper swinging body 2. (See FIGS. 2 to 5).

左右一対の連結具４５は、公知のターンバックル式の固定部材である。連結具４５は、上側ハッカー４５Ａと、下側ハッカー４５Ｂと、を有する。連結具４５の中央部のターンバックル部分が回転されることで、上側ハッカー４５Ａと下側ハッカー４５Ｂとの間の距離が変化する。作業者は、上側ハッカー４５Ａをガントリ４の内側突出部４３Ｄの取付孔４３Ｅまたは連結ブラケット４１Ａの取付孔４１Ｂに係止することができる。また、作業者は、下側ハッカー４５Ｂを、旋回フレーム２１のブラケット２８の取付孔２８Ａに係止することができる。 The pair of left and right connecting members 45 are known turnbuckle type fixing members. The connector 45 has an upper hacker 45A and a lower hacker 45B. By rotating the turnbuckle portion at the center of the connector 45, the distance between the upper hacker 45A and the lower hacker 45B changes. The operator can lock the upper hacker 45A into the mounting hole 43E of the inner protrusion 43D of the gantry 4 or the mounting hole 41B of the connecting bracket 41A. Further, the operator can lock the lower hacker 45B into the mounting hole 28A of the bracket 28 of the swivel frame 21.

左右一対の連結ピン４６は、それぞれ、後下側脚部４３の孔部４３Ｈ（図７）および後上側脚部４２の孔部４２Ｈ（図７）に挿通されることで、後上側脚部４２と後下側脚部４３とを連結するとともに、後上側脚部４２および後下側脚部４３の回動（屈伸）における軸心（第３軸心）を形成する。 The pair of left and right connecting pins 46 are inserted into the holes 43H (FIG. 7) of the rear lower leg 43 and the holes 42H (FIG. 7) of the rear upper leg 42, respectively, so that the rear upper leg 42 And the rear lower leg portion 43 are connected to each other, and an axial center (third axial center) in rotation (bending and extension) of the rear upper leg portion 42 and the rear lower leg portion 43 is formed.

左右一対のストッパ２６（図２、図６）は、支軸２５の下方において旋回フレーム２１の側壁部２２にそれぞれ固定されている。また、ストッパ２６は、前後方向において、外側突出部４３Ｂに対向するように配置されている（図６）。ストッパ２６は、緩衝材２６Ａと、コイルばね２６Ｂ（付勢部材）と、を有する。緩衝材２６Ａは、弾性材料から構成される。コイルばね２６Ｂは、緩衝材２６Ａを外側突出部４３Ｂに向かって付勢する。このような構成によって、ストッパ２６は、ガントリ４の起立姿勢から倒伏姿勢への姿勢変更において、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として後方に屈曲することを規制する。また、コイルばね２６Ｂは、ガントリ４の起立姿勢から倒伏姿勢への姿勢変更において、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として前方に屈曲するように、後下側脚部４３の外側突出部４３Ｂを付勢する。 The pair of left and right stoppers 26 (FIGS. 2 and 6) are fixed to the side wall portion 22 of the swivel frame 21 below the support shaft 25, respectively. Further, the stopper 26 is arranged so as to face the outer protrusion 43B in the front-rear direction (FIG. 6). The stopper 26 has a cushioning material 26A and a coil spring 26B (a urging member). The cushioning material 26A is made of an elastic material. The coil spring 26B urges the cushioning material 26A toward the outer protrusion 43B. With such a configuration, the stopper 26 regulates that the rear upper leg portion 42 and the rear lower leg portion 43 bend backward with the connecting pin 46 as a fulcrum when the posture of the gantry 4 is changed from the standing posture to the lying posture. To do. Further, the coil spring 26B is on the rear lower side so that the rear upper leg portion 42 and the rear lower leg portion 43 bend forward with the connecting pin 46 as a fulcrum when the posture of the gantry 4 is changed from the standing posture to the lying posture. The outward protruding portion 43B of the leg portion 43 is urged.

更に、旋回フレーム２１は、一対の受け部２７を備える（図６）。一対の受け部２７は、それぞれ、支軸２５の上方において、側壁部２２の上面部に固定されている。受け部２７は、直方体形状を有し、上面部に緩衝材２７Ａを備える。受け部２７には、ガントリ４の倒伏姿勢において、後上側脚部４２の下面部が当接する（図８）。 Further, the swivel frame 21 includes a pair of receiving portions 27 (FIG. 6). Each of the pair of receiving portions 27 is fixed to the upper surface portion of the side wall portion 22 above the support shaft 25. The receiving portion 27 has a rectangular parallelepiped shape and is provided with a cushioning material 27A on the upper surface portion. The lower surface portion of the rear upper leg portion 42 abuts on the receiving portion 27 in the lying posture of the gantry 4 (FIG. 8).

次に、図２乃至図８に加え、図９を参照して、ガントリ４の姿勢変更について更に詳述する。図９は、本実施形態に係るクレーンにおいて、ガントリ４が上部旋回体２に対して起立姿勢から倒伏姿勢に姿勢変更する軌跡を示した側面図である。 Next, in addition to FIGS. 2 to 8, the posture change of the gantry 4 will be described in more detail with reference to FIG. FIG. 9 is a side view showing a locus of the gantry 4 changing its posture from the standing posture to the lying posture with respect to the upper swinging body 2 in the crane according to the present embodiment.

本実施形態では、クレーンの使用時、ガントリ４は、図２のような起立姿勢とされる。この際、フック１３の吊り上げによるブームガイライン６の張力は、前側脚部４１に対して圧縮負荷として作用し、後上側脚部４２および後下側脚部４３に対して引っ張り負荷として作用する。ガントリ４の起立姿勢では、後下側脚部４３の取付孔４３Ｅに連結具４５の上側ハッカー４５Ａが係止され、旋回フレーム２１の取付孔２８Ａに連結具４５の下側ハッカー４５Ｂが係止されている（図７）。この結果、後下側脚部４３の内側突出部４３Ｄおよび旋回フレーム２１のブラケット２８が連結具４５によって連結、固縛される。したがって、ガントリ４が安定して起立姿勢に保持される。また、この際、後下側脚部４３の外側突出部４３Ｂがストッパ２６に当接しているため、後下側脚部４３が後方に回動することが防止される。 In the present embodiment, when the crane is used, the gantry 4 is in an upright posture as shown in FIG. At this time, the tension of the boom guy line 6 due to the lifting of the hook 13 acts as a compressive load on the front leg 41 and as a tensile load on the rear upper leg 42 and the rear lower leg 43. In the standing posture of the gantry 4, the upper hacker 45A of the connector 45 is locked in the mounting hole 43E of the rear lower leg 43, and the lower hacker 45B of the connector 45 is locked in the mounting hole 28A of the swivel frame 21. (Fig. 7). As a result, the inner protruding portion 43D of the rear lower leg portion 43 and the bracket 28 of the swivel frame 21 are connected and fixed by the connecting tool 45. Therefore, the gantry 4 is stably held in the upright posture. Further, at this time, since the outer protruding portion 43B of the rear lower leg portion 43 is in contact with the stopper 26, the rear lower leg portion 43 is prevented from rotating backward.

ガントリ４が起立姿勢から倒伏姿勢に姿勢変更されるにあたって、まず、作業者は、連結具４５のターンバックルを緩めて、連結具４５の上側ハッカー４５Ａを取付孔４３Ｅから取り外すとともに、下側ハッカー４５Ｂを取付孔２８Ａから取り外す。この際、作業者は、連結ピン４６の周辺の高い位置での作業を行うことなく、地上または旋回フレーム２１上において、連結具４５を容易に取り外すことができる。なお、ブラケット２８は、旋回フレーム２１の下部に配置されている。このため、連結具４５の下側ハッカー４５Ｂを取付孔２８Ａから取り外す際には、作業者は地上Ｇに立ったまま、作業を行うことができる。 When the gantry 4 is changed from the standing posture to the lying posture, the operator first loosens the turnbuckle of the connecting tool 45, removes the upper hacker 45A of the connecting tool 45 from the mounting hole 43E, and removes the lower hacker 45B. Is removed from the mounting hole 28A. At this time, the operator can easily remove the connecting tool 45 on the ground or on the swivel frame 21 without performing the work at a high position around the connecting pin 46. The bracket 28 is arranged below the swivel frame 21. Therefore, when the lower hacker 45B of the connector 45 is removed from the mounting hole 28A, the operator can perform the work while standing on the ground G.

次に、油圧シリンダ４４が縮小されることで、前側脚部４１が支軸２４回りに後方に回動する（図３）。この際、前側脚部４１の回動に連れて、後上側脚部４２および後下側脚部４３が後方に屈曲するように回動する可能性があるが、後下側脚部４３の外側突出部４３Ｂがストッパ２６に当接することで、後下側脚部４３の後方への回動が阻止される。この結果、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として前方に屈曲することが促進される。更に、ストッパ２６のコイルばね２６Ｂが後下側脚部４３の外側突出部４３Ｂを後方に付勢するため、後下側脚部４３の上方部分が前方に回動しやすく、上記のような後上側脚部４２および後下側脚部４３の屈曲が更に促進される。この結果、ガントリ４を倒伏姿勢に確実に導くことができる。 Next, as the hydraulic cylinder 44 is reduced, the front leg 41 rotates rearward around the support shaft 24 (FIG. 3). At this time, as the front leg 41 rotates, the rear upper leg 42 and the rear lower leg 43 may rotate so as to bend rearward, but the outside of the rear lower leg 43. When the protruding portion 43B comes into contact with the stopper 26, the rear lower leg portion 43 is prevented from rotating backward. As a result, the rear upper leg portion 42 and the rear lower leg portion 43 are promoted to bend forward with the connecting pin 46 as a fulcrum. Further, since the coil spring 26B of the stopper 26 urges the outer protruding portion 43B of the rear lower leg portion 43 to the rear, the upper portion of the rear lower leg portion 43 is likely to rotate forward, and the rear portion as described above Bending of the upper leg 42 and the rear lower leg 43 is further promoted. As a result, the gantry 4 can be reliably guided to the prone position.

やがて、ガントリ４が、図４に示すように略水平方向に沿った倒伏姿勢に至ると、旋回フレーム２１の受け部２７（図６）の緩衝材２７Ａに後上側脚部４２の下面部が当接する。また、後上側脚部４２の上面部に前側脚部４１の緩衝材４１Ｄが当接する。この結果、緩衝材２７Ａおよび緩衝材４１Ｄを介して、旋回フレーム２１の側壁部２２、後上側脚部４２および前側脚部４１が当接した状態となり、クレーンの輸送時の騒音（金属同士が干渉する音）や損傷が防止される。 Eventually, when the gantry 4 reaches a lying posture along a substantially horizontal direction as shown in FIG. 4, the lower surface portion of the rear upper leg portion 42 hits the cushioning material 27A of the receiving portion 27 (FIG. 6) of the swivel frame 21. Touch. Further, the cushioning material 41D of the front leg 41 comes into contact with the upper surface of the rear upper leg 42. As a result, the side wall portion 22, the rear upper leg portion 42, and the front side leg portion 41 of the swivel frame 21 are in contact with each other via the cushioning material 27A and the cushioning material 41D, and noise during transportation of the crane (metals interfere with each other). Sound) and damage are prevented.

更に、ガントリ４の倒伏姿勢では、前側脚部４１の一対の連結ブラケット４１Ａが、旋回フレーム２１の一対のブラケット２８の上方に位置する（図８）。そして、作業者は、連結ブラケット４１Ａの取付孔４１Ｂに連結具４５の上側ハッカー４５Ａを係止し、連結具４５の下側ハッカー４５Ｂをブラケット２８の取付孔２８Ａに係止することができる。そして、作業者は、連結具４５のターンバックルを締め付けることで、連結ブラケット４１Ａとブラケット２８とを固縛することができる。この結果、ガントリ４を倒伏姿勢に安定して保持することができる。なお、作業者は、連結ピン４６の周辺の高い位置での作業を行うことなく、地上または旋回フレーム２１上において、連結具４５を容易に装着することができる。この場合も、連結具４５の下側ハッカー４５Ｂを取付孔２８Ａに取り付ける際には、作業者は地上Ｇに立ったまま、作業を行うことができる。 Further, in the tilted posture of the gantry 4, the pair of connecting brackets 41A of the front leg 41 is located above the pair of brackets 28 of the swivel frame 21 (FIG. 8). Then, the operator can lock the upper hacker 45A of the connecting tool 45 to the mounting hole 41B of the connecting bracket 41A, and lock the lower hacker 45B of the connecting tool 45 to the mounting hole 28A of the bracket 28. Then, the operator can firmly fasten the connecting bracket 41A and the bracket 28 by tightening the turnbuckle of the connecting tool 45. As a result, the gantry 4 can be stably held in the prone position. The operator can easily mount the connecting tool 45 on the ground or on the swivel frame 21 without performing the work at a high position around the connecting pin 46. Also in this case, when the lower hacker 45B of the connector 45 is attached to the attachment hole 28A, the operator can perform the work while standing on the ground G.

なお、ガントリ４が倒伏姿勢から起立姿勢に姿勢変更される際には、作業者によって上記とは逆の手順で作業が行われる。 When the posture of the gantry 4 is changed from the lying posture to the standing posture, the work is performed by the operator in the reverse procedure of the above.

以上のように、本実施形態では、油圧シリンダ４４の伸縮に応じて、ガントリ４が起立姿勢と倒伏姿勢との間で姿勢変更することができる。起立姿勢では、前側脚部４１が上部旋回体２の旋回フレーム２１から後方かつ上方に延びるとともに、後上側脚部４２および後下側脚部４３がそれぞれ上下方向に沿って延びている。また、倒伏姿勢では、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として前方に屈曲し、前側脚部４１が上部旋回体２の旋回フレーム２１上に倒伏する。そして、本実施形態では、このようなガントリ４の姿勢変更に際して、連結ピン４６が孔部４２Ｈおよび孔部４３Ｈから引き抜かれる必要がない。すなわち、作業者は、旋回フレーム２１よりも高い位置に配置された連結ピン４６の周辺で作業する必要がないため、ガントリ４の姿勢変更を容易かつ安全に実行することができる。 As described above, in the present embodiment, the gantry 4 can change its posture between the standing posture and the lying posture according to the expansion and contraction of the hydraulic cylinder 44. In the standing posture, the front leg 41 extends rearwardly and upwardly from the swivel frame 21 of the upper swivel body 2, and the rear upper leg 42 and the rear lower leg 43 extend in the vertical direction, respectively. Further, in the lying posture, the rear upper leg portion 42 and the rear lower leg portion 43 bend forward with the connecting pin 46 as a fulcrum, and the front side leg portion 41 lies down on the turning frame 21 of the upper turning body 2. In the present embodiment, the connecting pin 46 does not need to be pulled out from the hole 42H and the hole 43H when the posture of the gantry 4 is changed. That is, since the operator does not need to work around the connecting pin 46 arranged at a position higher than the swivel frame 21, the posture of the gantry 4 can be changed easily and safely.

換言すれば、従来のクレーンでは、後上側脚部４２および後下側脚部４３が、スライドピンおよび固定ピンによって連結されていた。そして、ガントリ４の姿勢変更に際して、まず、作業者によって固定ピンが引き抜かれる。また、スライドピンが、後上側脚部４２または後下側脚部４３に開口された長穴に沿って移動しながら、後上側脚部４２および後下側脚部４３が屈曲する。このように、従来のクレーンでは、作業者が固定ピンの着脱を行う必要があった。 In other words, in the conventional crane, the rear upper leg portion 42 and the rear lower leg portion 43 are connected by a slide pin and a fixing pin. Then, when changing the posture of the gantry 4, the fixing pin is first pulled out by the operator. Further, the rear upper leg 42 and the rear lower leg 43 are bent while the slide pin moves along the elongated hole opened in the rear upper leg 42 or the rear lower leg 43. As described above, in the conventional crane, it is necessary for the operator to attach / detach the fixing pin.

また、本実施形態に係る連結ピン４６について換言すれば、連結ピン４６は、ガントリ４の起立姿勢において後下側脚部４３に対する後上側脚部４２の上下方向の位置を規制する。すなわち、連結ピン４６が、孔部４２Ｈおよび孔部４３Ｈに挿通されていることで、起立姿勢において、後上側脚部４２が下方にずれることがない。また、連結ピン４６は、ガントリ４が起立姿勢から倒伏姿勢に姿勢変更する際に、支軸２５と連結ピン４６との距離と、連結ピン４６と支軸４７との距離との比を一定に保持しながら、ガントリ４の姿勢変更を許容する。なお、上記のように、スライドピンが長穴内を移動する従来の構成では、ガントリ４の姿勢変更中に、支軸２５とスライドピンとの距離と、スライドピンと支軸４７との距離との比が変化する。そして、本実施形態では、このような連結ピン４６の機能を許容するように、孔部４２Ｈおよび孔部４３Ｈの開口位置が設定されている。 Further, in other words, the connecting pin 46 according to the present embodiment regulates the vertical position of the rear upper leg 42 with respect to the rear lower leg 43 in the standing posture of the gantry 4. That is, since the connecting pin 46 is inserted through the hole portion 42H and the hole portion 43H, the rear upper leg portion 42 does not shift downward in the standing posture. Further, the connecting pin 46 keeps the ratio of the distance between the support shaft 25 and the connecting pin 46 and the distance between the connecting pin 46 and the supporting shaft 47 constant when the gantry 4 changes its posture from the standing posture to the lying posture. Allows the posture of the gantry 4 to change while holding it. As described above, in the conventional configuration in which the slide pin moves in the elongated hole, the ratio of the distance between the support shaft 25 and the slide pin and the distance between the slide pin and the support shaft 47 is increased during the posture change of the gantry 4. Change. Then, in the present embodiment, the opening positions of the hole portion 42H and the hole portion 43H are set so as to allow such a function of the connecting pin 46.

更に、本実施形態では、ガントリ４の起立姿勢において、後下側脚部４３の内側突出部４３Ｄおよび旋回フレーム２１のブラケット２８が連結具４５によって連結される（連結具４５の起立連結状態）。そして、連結具４５は、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として屈曲することを規制する。このため、ガントリ４を起立姿勢に安定して保持することができる。更に、ガントリ４の倒伏姿勢において、連結具４５は旋回フレーム２１と前側脚部４１とを連結することができる（連結具４５の倒伏連結状態）。このため、ガントリ４を倒伏姿勢に安定して保持することができる。また、連結具４５は、連結ブラケット４１Ａ、ブラケット２８、内側突出部４３Ｄのうちの少なくとも一の部材から脱離されることで、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として屈伸しガントリ４が起立姿勢とから倒伏姿勢との間で姿勢変更することを許容する（連結具４５の非連結状態）。このように、起立姿勢および倒伏姿勢において、連結具４５を共用することができるため、クレーンのコストが低減されるとともに、連結具４５の格納場所が別途確保される必要がない。このため、作業者は連結具４５を格納する作業が不要となるため、作業者にかかる負担を減らすことができる。更に、連結具４５がターンバックル式の固定具からなるため、固定時に、後下側脚部４３と旋回フレーム２１との間、および、前側脚部４１と旋回フレーム２１との間のガタを吸収することが可能となる。このため、クレーンの作業時や輸送時に、ガントリ４の姿勢を安定して保持することができる。 Further, in the present embodiment, in the standing posture of the gantry 4, the inner protruding portion 43D of the rear lower leg portion 43 and the bracket 28 of the swivel frame 21 are connected by the connecting tool 45 (the standing connecting state of the connecting tool 45). Then, the connecting tool 45 regulates that the rear upper leg portion 42 and the rear lower leg portion 43 are bent with the connecting pin 46 as a fulcrum. Therefore, the gantry 4 can be stably held in the standing posture. Further, in the lying posture of the gantry 4, the connecting tool 45 can connect the swivel frame 21 and the front leg portion 41 (the connecting tool 45 is in an inverted connecting state). Therefore, the gantry 4 can be stably held in the prone position. Further, the connecting tool 45 is detached from at least one member of the connecting bracket 41A, the bracket 28, and the inner protruding portion 43D, so that the rear upper leg portion 42 and the rear lower leg portion 43 serve as a fulcrum of the connecting pin 46. As a result, the gantry 4 is allowed to change its posture between the standing posture and the lying posture (the connecting tool 45 is not connected). As described above, since the connecting tool 45 can be shared in the standing posture and the lying down posture, the cost of the crane is reduced and it is not necessary to separately secure a storage place for the connecting tool 45. Therefore, the worker does not need to store the connector 45, so that the burden on the worker can be reduced. Further, since the connector 45 is a turnbuckle type fixture, it absorbs backlash between the rear lower leg 43 and the swivel frame 21 and between the front leg 41 and the swivel frame 21 at the time of fixing. It becomes possible to do. Therefore, the posture of the gantry 4 can be stably maintained during the work or transportation of the crane.

また、本実施形態では、ストッパ２６は、ガントリ４の起立姿勢から倒伏姿勢への姿勢変更において、後上側脚部４２および後下脚部４３が連結ピン４６を支点として後方に屈曲することを規制する。このため、ガントリ４の姿勢変更が安定して実現される。また、ガントリ４の起立姿勢から倒伏姿勢への姿勢変更に際して、後上脚部４２および後下脚部４３が前方に屈曲することが、コイルばね２６Ｂによって促進される。このため、ガントリ４の姿勢変更がよりスムーズに実現される。 Further, in the present embodiment, the stopper 26 regulates that the rear upper leg portion 42 and the rear lower leg portion 43 bend backward with the connecting pin 46 as a fulcrum when the posture of the gantry 4 is changed from the standing posture to the lying posture. .. Therefore, the posture change of the gantry 4 is stably realized. Further, when the posture of the gantry 4 is changed from the standing posture to the lying posture, the rear upper leg portion 42 and the rear lower leg portion 43 are promoted to bend forward by the coil spring 26B. Therefore, the posture change of the gantry 4 is realized more smoothly.

なお、本実施形態のように、１つの連結ピン４６のみによって後上側脚部４２および後下側脚部４３が屈伸可能に連結されるためには、連結ピン４６の配置（孔部４２Ｈおよび孔部４３Ｈの開口位置）が重要となる。図１０および図１１は、本実施形態に係るクレーンにおいて、連結ピン４６の配置が決定されるための側面図である。図１０および図１１では、支軸２４を中心とする前側脚部４１の回動における支軸４７の軌跡が仮想円Ｃ１で描かれている。同様に、支軸４７を中心とする後上側脚部４２の回動における連結ピン４６の軌跡が仮想円Ｃ２で描かれている。また、支軸２５を中心とする後下側脚部４３の回動における連結ピン４６の軌跡が仮想円Ｃ３で描かれている。また、ガントリ４の起立姿勢における前側脚部４１の中心線が仮想直線Ｌで描かれている。 In addition, as in the present embodiment, in order for the rear upper leg portion 42 and the rear lower leg portion 43 to be flexibly connected by only one connecting pin 46, the connecting pin 46 is arranged (hole portion 42H and hole). The opening position of the portion 43H) is important. 10 and 11 are side views for determining the arrangement of the connecting pin 46 in the crane according to the present embodiment. In FIGS. 10 and 11, the locus of the support shaft 47 in the rotation of the front leg 41 about the support shaft 24 is drawn by the virtual circle C1. Similarly, the locus of the connecting pin 46 in the rotation of the rear upper leg 42 about the support shaft 47 is drawn by the virtual circle C2. Further, the locus of the connecting pin 46 in the rotation of the rear lower leg portion 43 about the support shaft 25 is drawn by the virtual circle C3. Further, the center line of the front leg 41 in the standing posture of the gantry 4 is drawn by a virtual straight line L.

連結ピン４６の位置が図１０の位置に仮に設定され、ガントリ４が起立姿勢から倒伏姿勢に至るまで、徐々に、前側脚部４１が後方に回動する。同様に、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として前方に屈曲する（図１１）。そして、連結ピン４６の位置は、仮想円Ｃ２および仮想円Ｃ３の接点および交点の軌跡上となる。したがって、予めガントリ４の起立位置および倒伏位置が決められており、ガントリ４がスムーズに屈伸できるように、連結ピン４６の位置が作図によって決定される。この結果、設定された連結ピン４６の配置において、本実施形態のような、ガントリ４の姿勢変更が実現される。 The position of the connecting pin 46 is tentatively set to the position shown in FIG. 10, and the front leg 41 gradually rotates backward from the standing posture to the lying posture of the gantry 4. Similarly, the rear upper leg portion 42 and the rear lower leg portion 43 bend forward with the connecting pin 46 as a fulcrum (FIG. 11). The position of the connecting pin 46 is on the locus of the contact points and intersections of the virtual circle C2 and the virtual circle C3. Therefore, the standing position and the lodging position of the gantry 4 are determined in advance, and the position of the connecting pin 46 is determined by drawing so that the gantry 4 can bend and stretch smoothly. As a result, in the set arrangement of the connecting pins 46, the posture change of the gantry 4 as in the present embodiment is realized.

以上、本発明の一実施形態に係るガントリ４を備えたクレーンについて説明した。なお、本発明はこれらの形態に限定されるものではない。本発明では、以下のような変形実施形態が可能である。 The crane provided with the gantry 4 according to the embodiment of the present invention has been described above. The present invention is not limited to these forms. In the present invention, the following modified embodiments are possible.

（１）上記の実施形態では、連結具４５が、ガントリ４の起立姿勢および倒伏姿勢において共用される態様にて説明したが、本発明はこれに限定されるものではない。ガントリ４の起立姿勢および倒伏姿勢のそれぞれに、専用の連結具４５が使用される態様でもよい。 (1) In the above embodiment, the connector 45 is shared in the standing posture and the lying posture of the gantry 4, but the present invention is not limited thereto. A dedicated connecting tool 45 may be used for each of the standing posture and the lying posture of the gantry 4.

（２）上記の実施形態では、ストッパ２６のコイルばね２６Ｂが、後上側脚部４２および後下側脚部４３が連結ピン４６を支点として後方に屈曲することを防止する態様にて説明したが、本発明はこれに限定されるものではない。前側脚部４１、後上側脚部４２および後下側脚部４３の各回動軸部（支軸２５、連結ピン４６、支軸４７）のいずれかに、捻りコイルばねが備えられることで、後上側脚部４２および後下側脚部４３が前方に屈曲することが促進されてもよい。すなわち、ストッパ２６およびコイルばね２６Ｂは、互いに別の位置に配置されてもよい。更に、ストッパ２６は後下側脚部４３に対向して配置されるものに限定されるものではなく、後上側脚部４２に対向して配置され、後上側脚部４２の一部に当接するものでもよい。 (2) In the above embodiment, the coil spring 26B of the stopper 26 has been described in a manner in which the rear upper leg portion 42 and the rear lower leg portion 43 are prevented from bending backward with the connecting pin 46 as a fulcrum. , The present invention is not limited to this. A torsion coil spring is provided on any of the rotation shafts (support shaft 25, connecting pin 46, support shaft 47) of the front leg 41, the rear upper leg 42, and the rear lower leg 43, whereby the rear is reared. The upper leg 42 and the rear lower leg 43 may be promoted to bend forward. That is, the stopper 26 and the coil spring 26B may be arranged at different positions from each other. Further, the stopper 26 is not limited to the one arranged so as to face the rear lower leg 43, but is arranged so as to face the rear upper leg 42 and abuts on a part of the rear upper leg 42. It may be a thing.

１下部走行体
２上部旋回体（機体）
３ブーム（起伏部材）
９ブーム起伏ロープ
１０ブーム起伏ウインチ
２１旋回フレーム
２２側壁部
２３底面部
２４支軸
２５支軸
２６ストッパ
２６Ａ緩衝材
２６Ｂコイルばね（付勢部材）
２７受け部
２７Ａ緩衝材
２８ブラケット（第２被連結部）
２８Ａ取付孔
３３連結部
３４連結軸
４１前側脚部（前脚部）
４１Ａ連結ブラケット（第３被連結部）
４１Ｂ取付孔
４１Ｃ当接ブラケット
４１Ｄ緩衝材
４２後上側脚部（後上脚部）
４３後下側脚部（後下脚部）
４３Ａ外側板
４３Ｂ外側突出部
４３Ｃ内側板
４３Ｄ内側突出部（第１被連結部）
４３Ｅ取付孔
４４油圧シリンダ（ガントリ起伏シリンダ）
４５連結具（起立用連結部材、倒伏用連結部材、連結部材）
４５Ａ上側ハッカー
４５Ｂ下側ハッカー
４６連結ピン
４７支軸 1 Lower traveling body 2 Upper turning body (airframe)
3 Boom (undulating member)
9 Boom undulation rope 10 Boom undulation winch 21 Swivel frame 22 Side wall 23 Bottom surface 24 Support shaft 25 Support shaft 26 Stopper 26A Cushioning material 26B Coil spring (biasing member)
27 Receiving part 27A Cushioning material 28 Bracket (2nd connected part)
28A Mounting hole 33 Connecting part 34 Connecting shaft 41 Front leg (front leg)
41A connecting bracket (third connected part)
41B Mounting hole 41C Abutment bracket 41D Cushioning material 42 Rear upper leg (rear upper leg)
43 Rear lower leg (rear lower leg)
43A Outer plate 43B Outer protrusion 43C Inner plate 43D Inner protrusion (first connected portion)
43E Mounting hole 44 Hydraulic cylinder (gantry undulating cylinder)
45 Connecting tool (standing connecting member, lodging connecting member, connecting member)
45A Upper hacker 45B Lower hacker 46 Connecting pin 47 Support shaft

Claims

With the aircraft
An undulating member that is undulatingly supported by the airframe,
The undulating member is supported by the aircraft so that the posture can be changed between the standing posture standing behind the undulating member and the laid posture lying on the aircraft, and the undulating member is supported in the undulating motion of the undulating member. With a gantry that functions as a support for the
A gantry undulating cylinder that includes a base end portion that is rotatably connected to the machine body and a tip portion that is connected to the gantry, and that expands and contracts the gantry so as to change its posture between the standing posture and the lying posture. When,
With
The gantry
A front leg portion supported by the airframe so as to rotate around a center of a first axis extending horizontally behind the undulating member in response to expansion and contraction of the gantry undulating cylinder.
A rear lower leg portion supported by the airframe so as to rotate around a second axial center parallel to the first axial center behind the front leg portion, and the second lower leg portion is located at a rotating end portion of the rear lower leg portion. The rear lower leg, which has a first hole extending parallel to the two axes,
A rear upper leg portion that connects the front leg portion and the rear lower leg portion so that the front leg portion extends rearwardly and upwardly from the machine body and the rear lower leg portion extends in the vertical direction in the standing posture. The rear upper leg portion includes a base end portion connected to the rotating end portion of the rear lower leg portion so as to be rotatable around a third axis center parallel to the first axis center, and the first shaft portion. It has a rotating end portion connected to the tip end portion of the front leg portion so as to be rotatable around a fourth axis parallel to the center, and further, the base end portion of the rear upper leg portion is said to have the same. The rear upper leg, which has a second hole extending parallel to the third axis,
A connecting pin that is inserted into the first hole of the rear lower leg and the second hole of the rear upper leg to form the third axis.
With
In the first hole portion and the second hole portion, the connecting pin regulates the vertical position of the rear upper leg portion with respect to the rear lower leg portion in the standing posture, and the gantry is tilted from the standing posture. At a position where the connecting pin allows the rear lower leg and the rear upper leg to bend forward with the connecting pin as a fulcrum and the front leg to lie down on the machine body when the posture is changed to the posture. Each is open ,
The rear lower leg portion has a first connected portion arranged below the second axis.
The airframe has a second connected portion arranged below the first connected portion, and has a second connected portion.
The connection is released by disconnecting from the connected state in which the first connected portion and the second connected portion are connected and at least one of the first connected portion and the second connected portion. An upright connecting member whose state can be changed from the unconnected state, which regulates the rear upper leg portion and the rear lower leg portion from bending with the connecting pin as a fulcrum in the connected state. A construction machine further equipped with connecting members.

The rear upper leg portion and the rear lower leg portion can be brought into contact with at least one of the rear upper leg portion and the rear lower leg portion, and when the posture of the gantry is changed from the standing posture to the lying posture, the rear upper leg portion and the rear lower leg portion are said to be in contact with each other. further comprising a stopper for restricting the bending backwards of the connection pin as a fulcrum, the construction machine according to claim 1.

The rear upper leg and the rear lower leg can be brought into contact with at least one of the rear upper leg and the rear lower leg, and when the posture of the gantry is changed from the standing posture to the lying posture, the rear upper leg and the rear lower leg are changed. The construction machine according to claim 1 or 2 , further comprising an urging member for urging the at least one leg so that the portion bends forward with the connecting pin as a fulcrum.

Claims 1 to 3 , further comprising a lodging connecting member for connecting a portion of the front leg portion between the first axis and the fourth axis and the machine body in the lying posture of the gantry. The construction machine according to any one item.

With the aircraft
An undulating member that is undulatingly supported by the airframe,
The undulating member is supported by the aircraft so that the posture can be changed between the standing posture standing behind the undulating member and the laid posture lying on the aircraft, and the undulating member is supported in the undulating motion of the undulating member. With a gantry that functions as a support for the
A gantry undulating cylinder that includes a base end portion that is rotatably connected to the machine body and a tip portion that is connected to the gantry, and that expands and contracts the gantry so as to change its posture between the standing posture and the lying posture. When,
With
The gantry
A front leg portion supported by the airframe so as to rotate around a center of a first axis extending horizontally behind the undulating member in response to expansion and contraction of the gantry undulating cylinder.
A rear lower leg portion supported by the airframe so as to rotate around a second axial center parallel to the first axial center behind the front leg portion, and the second lower leg portion is located at a rotating end portion of the rear lower leg portion. The rear lower leg, which has a first hole extending parallel to the two axes,
A rear upper leg portion that connects the front leg portion and the rear lower leg portion so that the front leg portion extends rearwardly and upwardly from the machine body and the rear lower leg portion extends in the vertical direction in the standing posture. The rear upper leg portion includes a base end portion connected to the rotating end portion of the rear lower leg portion so as to be rotatable around a third axis center parallel to the first axis center, and the first shaft portion. It has a rotating end portion connected to the tip end portion of the front leg portion so as to be rotatable around a fourth axis parallel to the center, and further, the base end portion of the rear upper leg portion is said to have the same. The rear upper leg, which has a second hole extending parallel to the third axis,
A connecting pin that is inserted into the first hole of the rear lower leg and the second hole of the rear upper leg to form the third axis.
With
In the first hole portion and the second hole portion, the connecting pin regulates the vertical position of the rear upper leg portion with respect to the rear lower leg portion in the standing posture, and the gantry is tilted from the standing posture. At a position where the connecting pin allows the rear lower leg and the rear upper leg to bend forward with the connecting pin as a fulcrum and the front leg to lie down on the machine body when the posture is changed to the posture. Each is open,
The rear lower leg portion has a first connected portion arranged below the second axis.
The airframe has a second connected portion arranged below the first connected portion, and has a second connected portion.
The front leg portion has a third connected portion arranged between the first axis and the fourth axis.
The standing connection state in which the gantry is held in the standing posture by connecting the first connected portion and the second connected portion, and the second connected portion and the third connected portion are connected. As a result, the gantry is detached from the collapsed connection state in which the gantry is held in the collapsed posture and at least one of the first connected portion, the second connected portion, and the third connected portion. The state change between the unconnected state in which the rear upper leg portion and the rear lower leg portion bend and stretch with the connecting pin as a fulcrum and allow the gantry to change its posture between the standing posture and the lying posture. A construction machine further equipped with a connecting member capable of