JP2004026506A

JP2004026506A - Portal crane

Info

Publication number: JP2004026506A
Application number: JP2003199634A
Authority: JP
Inventors: Takusuke Kamo; 加茂　琢資
Original assignee: KYOEI SEISAKUSHO; Kyoei Manufacturing Co Ltd
Current assignee: KYOEI SEISAKUSHO; Kyoei Manufacturing Co Ltd
Priority date: 2003-07-22
Filing date: 2003-07-22
Publication date: 2004-01-29

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portal crane used for railway maintenance operation allowing a large number of the cranes with high rigidity to be easily transported in a stacked state and preventing these cranes from being rattled during transportation. <P>SOLUTION: In this portal crane, rotatable support legs 3 and 4 are fitted to both end parts of running beam 2 allowing a hoist 5 to be run thereon, a pair of brackets 31 and 41 are fixed to the upper part of the support legs, and the pair of brackets comprise a pair of parallel faces 31d and 41d fitted to the running beam along both outer side faces thereof. When the support legs are rotated inward and stored, parts of the parallel faces 31d and 41d of the pair of brackets are projected from the support legs 3 and 4 to the opposite side of the running beam 2, and the inside width dimensions of the projected parts 31e and 41e are formed such that the outer side face part of the running beam 2 can be fitted thereto and the width dimension is generally equal to the outer side face part width dimension. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【産業上の利用分野】
この発明は、鉄道の保安作業等に用いられる門型クレーンに関するものであり、剛性が高く、軽量で、多数積み重ねるときのスタック性、安定性が良好なものである。
【０００２】
【従来の技術】
門型クレーンは、例えば鉄道の保安作業等に用いられるものであり、その一例が、実公昭５０−８８５８号公報、実公昭５４−１３３２１号公報等に記載されている。このものは走行桁の両端部に支持脚を設けたものであり、線路等の重量物を吊り下げて巻き上げ機が走行桁上を移動するものである。
【０００３】
【発明が解決しようとする課題】
このような門型クレーンでは、線路等の重量物を吊り下げた巻き上げ機が走行桁上を移動する際、走行桁に大きな荷重がかかり、当該走行桁の上面側には圧縮応力が、下面側には引張応力がかかり、特に走行桁の縦断面の略長方形状の角部の応力が大きくなる傾向がある。
【０００４】
ところで、走行桁の断面形状は、略Ｃ形状であり、しかも肉厚が略一定である。また、走行桁の材質が鉄ならば剛性・強度とも問題はないが、軽量化のためアルミニウム合金等に変更すると、このままの形状・肉厚だと剛性・強度不足となってしまう場合がある。
【０００５】
また、門型クレーンを多数重ねて運搬する際、整列させて架台がずれないようにするために特別の枠体を別個に必要とする。即ち、門型クレーンの支持脚は走行桁にピンによって支持されるが、ピン側の、桁受けの垂下開放端内側とそこに嵌合される支持脚上端部外側との隙間については、両者は常に嵌合されたままであり、構造上ピン回りに回動できれば良いのであるから、微小隙間で足りる。しかし、ピン側の、止板間とそこに嵌入・離脱される安定板との隙間については、両者がスムーズに嵌入・離脱できるものでなければならず、そのために、製造時の精度管理上、あるていど大きなものにせざるを得ない。したがって、ピン側のガタが大きくなり、その分走行桁と支持脚の結合がガタつくという問題がある。
【０００６】
この発明は、上記問題に鑑みなされたもので、多数積み重ねて運搬することが容易で、かつ運搬の際にガタつくことが防止される門型クレーンを提供することを目的としている。
【０００７】
【課題を解決するための手段】
上記課題を解決するために、請求項１記載の発明の門型クレーンは、
支持脚で支持された左右一対の平行な走行桁上を巻き上げ機が走行可能であり、　上記走行桁の長手方向と直交する方向でかつ水平方向に設けた回動軸回りに前記走行桁と前記支持脚が略直交する状態の起立位置と前記支持脚の下部が前記走行桁の中間部に向かって移動し、前記支持脚と前記走行桁が略平行になる状態の収納位置に回動可能に、前記走行桁の左右両端部に前記支持脚を設け、
前記支持脚の上部に固定されたブラケットが前記回動軸に支持され、前記ブラケットは前記走行桁の両外側に沿って嵌合される一対の平行面を有し、
前記一対の平行面及びその間に嵌合される前記走行桁の両外側面を前記回動軸が貫通し、前記支持脚を収納したとき、前記一対の平行面の各一部が前記支持脚より走行桁と反対側に突出し、
前記各突出部の内側の幅寸法は、左右一対の走行桁の外側面部が嵌合できかつ前記外側面部幅寸法と略等しくなるように設定されていることを特徴としている。
【０００８】
請求項２記載の発明の門型クレーンは、
支持脚で支持された左右一対の平行な走行桁上を巻き上げ機が走行可能であり、　上記走行桁の長手方向と直交する方向でかつ水平方向に設けた回動軸回りに前記走行桁と前記支持脚が略直交する状態の起立位置と、前記支持脚の下部が前記走行桁の中間部に向かって移動し、前記支持脚と前記走行桁が略平行になる状態の収納位置に回動可能に、前記走行桁の左右両端部に支持脚を設け、
上記支持脚の上部に固定されたブラケットが前記回動軸に支持され、前記ブラケットは前記走行桁の両外側面に沿って嵌合される一対の平行面を有し、
上記一対の平行面及びその間に嵌合される前記走行桁の両外側面を前記回動軸が貫通し、前記支持脚が起立位置にあるとき、前記一対の平行面及びその間に嵌合される走行桁の両外側面を貫通するロックピンによって、前記走行桁に対する支持脚の回動を阻止し、
前記支持脚が起立位置にあるときの前記ロックピンの位置が、支持脚の略直上であることを特徴としている。
【０００９】
請求項３記載の門型クレーンは、請求項１の発明の門型クレーンにおいて、前記回動軸が、前記支持脚が起立位置にあるときの前記ロックピンの位置よりも前記走行桁の中間部寄りに離間して配設されていることを特徴としている。
【００１０】
請求項４記載の門型クレーンは、請求項２の発明の門型クレーンにおいて、前記ロックピンを引き抜いて前記支持脚を前記起立位置から前記収納位置にし、引き抜いたロックピンが前記一対の平行面及びその間に嵌合された前記走行桁の両外側面を貫通して、前記走行桁に対する前記支持脚の回動を阻止することを特徴としている。
【００１１】
【作用】
請求項１の発明では、支持脚を収納状態にした門型クレーンを同じ向きに複数個積み重ねて運搬するとき、突出部間に別の門型クレーンの走行桁を嵌合して積み重ねるようにすると、車両等で運搬するときでも、門型クレーンがきちんと整列されたままずれることがない。
【００１２】
請求項２の発明では、支持脚を回動軸回りに回動させるときに、走行桁の両側面に嵌合されたブラケットの一対の平行面の内面は走行桁の両外側面に沿って摺動するが、この摺動部の両者部材間の隙間はある程度小さく設定しても、ブラケットの一対の平行面の内面は常に走行桁の両外側面に沿って摺動して滑らかに回動することができる。
一方、ロックピンが貫通するブラケットの一対の平行面の内面部と走行型の外側面間の隙間も同様の理由で小さく設定できるので、支持脚と走行桁の連結箇所である回動軸及びロックピンの部位が、この軸方向にガタなく固定される。また、走行桁に対する支持脚の回動軸回りの方向の変位は回動軸及びロックピンで両者が強固に固定されているので、結局、走行桁と支持脚とは全ての方向にガタなしに強固に連結される。
【００１３】
請求項３の発明では、回動軸を離間して配設したので、回動軸とロックピン間の支持スパンが長くなり、強固に支持される。また、門型クレーンを複数個積み重ねるときに突出部内側の嵌合部位が、支持脚を収納したときに、そこに嵌合される走行桁の中間部寄りに位置し、この箇所は取り扱い時に他の資材にぶつけ易い走行桁の両端部に比べて損傷が少なく部材の塑性変形等が少ない位置であり、常に良好な嵌合精度が維持される。
【００１４】
請求項４の発明では、一つのロックピンを収納時及び起立時に使用でき、構造的に簡略化されるだけでなく、常にロックピンが使用されるので、紛失することが防止される。
【００１５】
【実施例】
以下、この発明の門型クレーンの実施例を説明する。
門型クレーン１は、例えば鉄道の保安作業等に用いられ、図１に示すように、左右一対の平行な走行桁２と、走行桁２の両端部に備えられた支持脚３，４と、走行桁２上を移動可能な巻き上げ機５から構成されている。巻き上げ機５は、走行ローラ５１により走行し、先端にレールキャッチ５３を有するチェーン５２で線路等の重量物が吊り下げられる。
【００１６】
左右一対の平行な走行桁２は、その両端部に連結プレート６を溶接して連結固定され、図２，図４，図６及び図８に示すように、所定間隔Ｗだけ隔てて配置されている。連結プレート６は、その下部に外側に屈曲させて運搬時に持つ把手６ａが形成されると共に、側部にガイド６ｂが形成されている。
平行な走行桁２上を巻き上げ機５の走行ローラ５１が転動して走行し、平行な走行桁２の間の空間から巻き上げ機５のチェーン５２が垂れ下がる。
【００１７】
走行桁２は、図６に示すように、縦断面を、上下方向に長い略長方形状をした外周壁２１ａと外周壁側面の上下方向中間部の内壁同士を連結する１または２以上の補強壁２１ｂとで構成するアルミニウム合金製の押し出し成形材の桁とし、外周壁側面の肉厚は上下方向中間部２１ａ１の肉厚Ｄ１よりも上部２１ａ２及び下部２１ａ３の肉厚Ｄ２，Ｄ３の方が厚く、かつ外周壁上下面の肉厚は、左右方向中間部２１ａ４の肉厚Ｄ４よりも左部２１ａ５及び右部２１ａ６の肉厚Ｄ５，Ｄ６の方を厚く形成している。
【００１８】
線路等の重量物を釣り下げたままで巻き上げ機５が走行桁２上を移動する際、走行桁２に大きな荷重がかかる。この時、走行桁２の上面側には圧縮応力が、下面側には引張応力がかかり、特に走行桁２の縦断面の略長方形状の角部の応力が大きくなる傾向がある。
しかし、走行桁２の角部の部分を厚肉としたので、応力が下がって変形を防止でき、それ以外のあまり応力のかからない部位は薄肉のままであるので、材料にかかる応力が均一になり材料を効率良く使え、また全体としてあまり重量増、コスト増とならない。さらに、走行桁２の略長方形状をした縦断面にはそれをひしゃげようとする力が作用するが、しかし適所に補強壁２１ｂを設けたので、ひしゃげることが防止される。
【００１９】
また、走行桁２の縦断面は、上部左右両側に鍔部２１ｃを外側方に延設し、鍔部２１ｃ及び走行桁上面２１ｄを覆うように構成し、かつ縦断面が略Ｃ形状をした鉄製のレール部材７を係合固定し、鉄製のレール部材７は、その両端部をねじ８で締付固定している。鉄製のレール部材７は、この実施例ではステンレスで形成されている。また、レール部材７を走行桁２の上面の両側に設けた長孔９の２箇所にねじ８をはめて固定しており、走行桁２の上面に大きな荷重がかかって走行桁２の桁２１及びレール部材７が湾曲変形した時、両者の相対変位を吸収することができる。また、２箇所でねじ８をはめて固定しているため、ねじ締結・取外し作業工数少なく、保守点検が容易である。また、レール部材７の中間部はねじ固定されていないので巻き上げ機５がレール部材７上を滑らかに移動できる。
【００２０】
さらに、線路等の重量物を釣り下げたままで巻き上げ機５が走行桁上を移動する際、走行桁２の上面の摩耗が問題となる。しかし、アルミニウム合金よりも耐摩耗性が高い鉄製のレール部材７を係合固定したので、耐摩耗性の点では問題がない。また、鉄製のレール部材７を設けた箇所が走行桁２上部のみであるので、あまり重量は増加しない。
【００２１】
走行桁２の両端部の側部には、支持脚３，４を取り付けるための補強板１０が溶接されており、この補強板１０から走行桁２に貫通して回動軸支持孔１１、起立位置支持孔１２と収納位置支持孔１３が形成され、さらに補強板１０の中央には軽量化のために孔２１３が形成されている。このように、走行桁２の両外側面に補強板１０をそれぞれ溶接して薄肉の走行桁２を補強し、その補強板１０と走行桁２の両外側面及び支持脚３，４のブラケット３１，４１の一対の平行面を回動軸１４及びロックピン１５が貫通している。なお、走行桁２の両外側面及びその面に溶接される補強板１０は共に平板であるので溶接作業性は良好である。
【００２２】
走行桁２の両端部に連結されている支持脚３，４は、当該支持脚３，４に対する支持面の如何に関わらず、使用時において走行桁２を水平にすることができるように、左右でその長さを異にしている（図１０及び図１１参照）。すなわち、図１において右側の支持脚３は、図１０に示すように、一対の支柱３２、上下の連結部材３３，３４からなり、その長さは一定であり、当該支柱３２の下部に接地板３５が溶接されている。また、支持脚３の上部の両側にブラケット３１が溶接されている。これに対して、図１における左側の支持脚４は、図１１に示すように、一対の外支柱４２、上下の連結部材４３，４４、内支柱４５からなり、外支柱４２と内支柱４５が摺動可能に嵌合されており、外支柱４２と内支柱４５を所定位置において長さ調整用ピン１６で固定することにより、支持脚４の長さを適宜調整することができるようになっている。即ち、外支柱４２の下部には支持孔４２ａが形成され、この支持孔４２ａの両側に補強プレート１７，１８が溶接されており、また、内支柱４５には、軸方向に所定間隔で調整孔４５ａが形成され、下部に接地板４６が溶接されている。また、支持脚４の上部の両側にブラケット４１が溶接されている。
【００２３】
支持脚の長さ調整用ピン１６は、図１３に示すように、ピン１６１と、スナップピン１６２と、ワイヤー１６３とで構成されたものであり、ワイヤー１６３の一方の端部１６３ａをピン１６１の孔部１６１ａに挿通してカシメ環１６４で固定し、また、ワイヤー１６３の他方の端部１６３ｂをスナップピン１６２のリング状の連結部１６２ａに挿通し、カシメ環１６５で固定してスナップピン１６２に連結されている。したがって、スナップピン１６２がワイヤー１６３から脱落することはない。
【００２４】
外支柱４２に対して内支柱４５を摺動させて走行桁２が水平になるように支持脚４の長さを調整し、外支柱４２の支持孔４２ａに内支柱４５の調整孔４５ａを合わせ、支持脚の長さ調整用ピン１６のピン１６１を挿通して外支柱４２と内支柱４５をロックし、ピン１６１の孔部１６１ｂにスナップピン１６２を挿通して抜け止めを行なう。
【００２５】
左右の支持脚３，４の上部のブラケット３１，４１には、回動軸取付孔３１ａ，４１ａが形成され、回動軸取付孔３１ａ，４１ａから左右一対の走行桁２の両端部の回動軸支持孔１１に回動軸１４を挿通し、左右の支持脚３，４の上部は回動軸１４を介して回動可能に連結され、ロックピン１５により起立位置と収納位置にそれぞれ係止される。ロックピン１５は、図１２に示すように、ピン１５１と、スナップピン１５２と、ワイヤー１５３から構成されている。ワイヤー１５３の一方の端部１５３ａをピン１５１の孔部１５１ａに挿通してカシメ環１５４で固定し、ワイヤー１５３の他方の端部１５３ｂをスナップピン１５２のリング状の連結部１５２ａに挿通してカシメ環１５５で固定することで、スナップピン１５２に連結している。したがって、スナップピン１５２がワイヤー１５３から脱落することはない。
【００２６】
左右の支持脚３，４のブラケット３１，４１には起立位置取付孔３１ｂ，４１ｂと収納位置取付孔３１ｃ，４１ｃとが形成されている。使用時には、ブラケット３１，４１の起立位置取付孔３１ｂ，４１ｂを走行桁２の両端部の側部の起立位置支持孔１２に合わせて、これにロックピン１５のピン１５１を挿通し、ピン１５１の孔部１５１ｂにスナップピン１５２を挿通して抜け止めを行なう。また、運搬時には、ブラケット３１，４１の収納位置取付孔３１ｃ，４１ｃを走行桁２の両端部の側部の収納位置支持孔１３に合わせて、これにロックピン１５のピン１５１を挿通し、ピン１５１の孔部１５１ｂにスナップピン１５２を挿通して抜け止めを行なう。
【００２７】
このように、支持脚３，４は、走行桁２の左右両端部に設けられ、走行桁２の長手方向と直交する方向でかつ水平方向に設けた回動軸１４回りに走行桁２と支持脚３，４が略直交する状態の起立位置と、支持脚３，４の下部が走行桁２の中間部に向かって移動し、支持脚３，４と走行桁２が略平行になる状態の収納位置に回動可能に支持脚３，４が設けられている。支持脚３，４の上部に固定されたブラケット３１，４１が回動軸１４に支持され、ブラケット３１，４１は走行桁２の両外側面に沿って嵌合される一対の平行面３１ｄ，４１ｄを有し、この一対の平行面３１ｄ，４１ｄ及びその間に嵌合される走行桁２の両外側面を回動軸１４が貫通し、支持脚２が起立位置にあるとき、一対の平行面３１ｄ，４１ｄ及びその間に嵌合される走行桁２の両外側面を貫通するロックピン１５によって、走行桁２に対する支持脚３，４の回動を阻止し、支持脚３，４が起立位置にあるときのロックピン１５の位置は、支持脚３，４の略直上にある。
【００２８】
支持脚３，４を回動軸１４回りに回動させる時に、走行桁２の両側面に嵌合されたブラケット３１，４１の一対の平行面３１ｄ，４１ｄの内面は走行桁２の両外側面に沿って摺動するが、この摺動部の両者部材間の隙間はある程度小さくても、ブラケット３，４の一対の平行面３１ｄ，４１ｄの内面は常に走行桁２の両外側面に沿って摺動して回動することができる。
【００２９】
一方、ロックピン１５が貫通するブラケット３，４の一対の平行面３１ｄ，４１ｄの内面部と走行桁２の両外側面間の隙間も同様の理由で小さく設定できるので、支持脚３，４と走行桁２の連結箇所である回動軸１４及びロックピン１５の部位が、この軸方向のガタがない状態で固定される。また、走行桁２に対する支持脚２の回動軸１４回りの方向の変位は、回動軸１４及びロックピン１５で両者が強固に固定されているので、結局、走行桁２と支持脚３，４とは全ての方向のガタがない状態で強固に連結される。
【００３０】
また、支持脚３，４の上部に固定されたブラケット３１，４１は、走行桁２の両外側面に沿って嵌合される一対の平行面３１ｄ，４１ｄを有し、一対の平行面３１ｄ，４１ｄ及びその間に嵌合される走行桁２の両外側面を回動軸１４が貫通し、支持脚３，４を収納したとき、一対の平行面３１ｄ，４１ｄの各一部が支持脚３，４より走行桁２とは反対側に突出し、各突出部３１ｅ，４１ｅの内側の幅寸法は、左右一対の走行桁２の外側面部が嵌合できかつ外側面部幅寸法と略等しい。
【００３１】
従って、図１４に示すように、支持脚３，４を収納状態にした門型クレーン１を同じ向きに複数個積み重ねて運搬する時、突出部３１ｅ，４１ｅ間に別の門型クレーン１の走行桁２を嵌合して積み重ねるようにすると、車両等で運搬する時でも、門型クレーン１がきちんと整列されたままでずれることがない。したがって、門型クレーン１を複数個積み重ねて運搬する際、整列させて門型クレーン１がずれないようにするために特別の枠体を別個に設ける必要がない。
また、回動軸１４を、支持脚２が起立位置にあるときのロックピン１５の位置よりも走行桁２の中間部寄りに離間して配設している。このように、回動軸１４を離間して配設したので、回動軸１４とロックピン１５間の支持スパンが長くて強固に支持される。ロックピン１５は、ピン１５１がパイプ材製で軽量であり、さらにその先端をプレス加工で縮径して挿通しやすくしている。
【００３２】
また、門型クレーン１を複数個積み重ねるときに、ブラケット３１，４１の突出部３１ｅ，４１ｅ内側の嵌合部位が、支持脚２を収納したときに、そこに嵌合される走行桁２の中間部寄りに位置し、この箇所は取り扱い時に他の資材にぶつけ易い走行桁２の両端部に比べて損傷が少なく部材の塑性変形等が少ない位置であるから、常に良好な嵌合精度が維持される。
また、ロックピン１５を引き抜いて支持脚３を起立位置から収納位置にし、引き抜いたロックピン１５を一対の平行面３１ｄ，４１ｄ及びその間に嵌合された走行桁２の両外側面を貫通して、走行桁２に対する支持脚３，４の回動を阻止するようになっている。
【００３３】
一つのロックピン１５を収納時及び起立時に使用でき、構造的に簡略化されるだけでなく、常にロックピン１５が使用されるので、紛失することはない。
支持脚３，４が起立位置の時に走行桁２上に荷重がかかると主にロックピン１５に荷重がかかる。そこで、このロックピン１５を各部材中の最弱部とし、例えば低強度の材料としたり、また、この実施例のようにパイプ状にしても良い。その強度を適宜設定して巻き上げ機５の許容吊り上げ荷重以上になると、ロックピン１５が塑性変形して、作業者が許容吊り上げ荷重以上で有ることをすぐに認識できるようにしている。また、一つのロックピン１５を収納時及び起立時に使用し、引き抜いたり、差し込んだりして、毎回作業者が手にするので一層気づき易い。
【００３４】
【発明の効果】
前記したように、請求項１記載の発明は、支持脚の上部に固定されたブラケットの平行面及びその間に嵌合される走行桁の両外側面を回動軸が貫通し、支持脚を収納したとき、一対の平行面の各一部が支持脚より走行桁とは反対側に突出し、各突出部の内側の幅寸法は、左右一対の走行桁の外側面部が嵌合できかつ外側面部幅寸法と略等しくなるように設定したから、支持脚を収納状態にした門型クレーンを同じ向きに複数個積み重ねて運搬する時、突出部間に別の門型クレーンの走行桁を嵌合して積み重ねるようにすると、車両等で運搬する時でも、門型クレーンがきちんと整列されたままでずれることがなく、門型クレーンを複数個積み重ねて運搬する際、整列して積み上げられた門型クレーンがずれないようにするために特別の枠体を別個に設ける必要はない。
【００３５】
請求項２記載の発明は、支持脚が起立位置にあるとき、一対の平行面及びその間に嵌合される走行桁の両外側面を貫通するロックピンによって、走行桁に対する支持脚の回動を阻止し、支持脚が起立位置にあるときのロックピンの位置は、支持脚の略直上とするから、支持脚を回動軸回りに回動させる時に、走行桁の両側面に嵌合されたブラケットの一対の平行面の内面は走行桁の両外側面に沿って摺動するが、この摺動部の両者部材間の隙間はある程度小さくても、ブラケットの一対の平行面の内面は常に走行桁の両外側面に沿って摺動して回動することができる。
【００３６】
一方、ロックピンが貫通するブラケットの一対の平行面の内面部と走行桁の両外側面間の隙間も同様の理由で小さくできるので、支持脚と走行桁の連結箇所である回動軸及びロックピンの部位が、この軸方向にガタのない状態で固定される。また、走行桁に対する支持脚の回動軸回りの方向の変位は回動軸及びロックピンで両者が強固に固定されているので、結局、走行桁と支持脚とは全ての方向においてガタのない状態で強固に連結される。
【００３７】
請求項３記載の発明は、回動軸を離間して配設したので、回動軸とロックピン間の支持スパンが長くて強固に支持される。また、門型クレーンを複数個積み重ねるときに突出部内側の嵌合部位が、支持脚を収納したときに、そこに嵌合される走行桁の中問部寄りに位置し、この箇所は取り扱い時に他の資材にぶつけ易い走行桁の両端部に比べて損傷が少なく部材の塑性変形等が少ない位置であり、常に良好な嵌合精度が維持される。
【００３８】
請求項４記載の発明は、一つのロックピンを収納時及び起立時に使用でき、構造的に簡略化されるだけでなく、常にロックピンが使用されるので、紛失することはない。
【図面の簡単な説明】
【図１】門型クレーンの正面図である。
【図２】門型クレーンの平面図である。
【図３】支持脚の取付部の正面図である。
【図４】支持脚の取付部の平面図である。
【図５】門型クレーンの一部側面図である。
【図６】図３のＡ−Ａ線に沿う断面図である。
【図７】走行桁の正面図である。
【図８】走行桁の平面図である。
【図９】走行桁の側面図である。
【図１０】一方の支持脚の側面図である。
【図１１】他方の支持脚の側面図である。
【図１２】ロックピンの側面図である。
【図１３】支持脚の長さ調整用ピンの側面図である。
【図１４】門型クレーンの運搬状態を示す図である。
【符号の説明】
１・・・門型クレーン
２・・・走行桁
３，４・・・支持脚
５・・・巻き上げ機
２１ａ・・・外周壁
２１ｂ・・・補強壁[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portal crane used for railway security work and the like, and has high rigidity, light weight, and good stackability and stability when stacking a large number.
[0002]
[Prior art]
The portal crane is used, for example, for railway security work, and one example thereof is described in Japanese Utility Model Publication No. 50-8858 and Japanese Utility Model Publication No. 54-13321. In this apparatus, supporting legs are provided at both ends of a traveling girder, and a hoist is suspended on a heavy object such as a track to move on the traveling girder.
[0003]
[Problems to be solved by the invention]
In such a portal crane, when a hoist that hangs a heavy object such as a railway track moves on a traveling girder, a large load is applied to the traveling girder, and a compressive stress is applied to an upper surface side of the traveling girder and a lower surface side. Is subjected to tensile stress, and the stress tends to increase particularly at the corners of the substantially rectangular shape of the longitudinal section of the traveling girder.
[0004]
By the way, the cross-sectional shape of the traveling girder is substantially C-shaped, and the thickness is substantially constant. In addition, if the material of the traveling girder is iron, there is no problem in rigidity and strength. However, if the material is changed to an aluminum alloy or the like for weight reduction, rigidity and strength may be insufficient if the shape and thickness are unchanged.
[0005]
In addition, when a large number of portal cranes are transported in piles, a special frame is separately required to align the cranes and prevent the gantry from shifting. That is, the support legs of the portal crane are supported by the traveling girder by the pins. Regarding the gap between the inside of the hanging open end of the girder support on the pin side and the outside of the upper end of the support leg fitted therein, Since it is only necessary that the pin is always fitted and can be rotated around the pin in terms of structure, a small gap is sufficient. However, the gap between the stop plate on the pin side and the stabilizing plate to be inserted / removed into the stopper plate must be such that both can be smoothly inserted / removed. There is no other choice but to make it bigger. Therefore, there is a problem that the play on the pin side becomes large, and the connection between the traveling girder and the support leg is loosened accordingly.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a portal crane that can be easily stacked and transported in a large number, and is prevented from rattling during transportation.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a portal crane according to the first aspect of the present invention
A hoist can travel on a pair of left and right parallel traveling girders supported by support legs, and the traveling girder and the traveling girder are arranged in a direction orthogonal to the longitudinal direction of the traveling girders and around a rotation axis provided in a horizontal direction. The upright position where the support legs are substantially orthogonal and the lower part of the support legs move toward the middle of the traveling girder, and are rotatable to a storage position where the support legs and the traveling girder are approximately parallel. Providing the support legs at both left and right ends of the traveling girder,
A bracket fixed to the upper part of the support leg is supported by the rotating shaft, and the bracket has a pair of parallel surfaces fitted along both outer sides of the traveling girder,
When the rotating shaft penetrates the pair of parallel surfaces and both outer surfaces of the traveling girder fitted between the pair of parallel surfaces and stores the support legs, a part of the pair of parallel surfaces is more than the support legs. Protruding on the opposite side of the traveling girder,
The width of the inner side of each of the protrusions is set so that the outer side surfaces of the pair of left and right traveling girders can be fitted and substantially equal to the outer side surface width.
[0008]
The portal crane of the invention according to claim 2 is
A hoist can travel on a pair of left and right parallel traveling girders supported by support legs, and the traveling girder and the traveling girder are arranged in a direction orthogonal to the longitudinal direction of the traveling girders and around a rotation axis provided in a horizontal direction. The support leg can be pivoted to a standing position in a state where the support leg is substantially perpendicular, and a lower part of the support leg moves toward an intermediate portion of the traveling girder, and a storage position where the support leg and the traveling girder are substantially parallel to each other. In addition, support legs are provided at both left and right ends of the traveling girder,
A bracket fixed to the upper portion of the support leg is supported by the rotating shaft, and the bracket has a pair of parallel surfaces fitted along both outer surfaces of the traveling girder,
When the rotation shaft passes through the pair of parallel surfaces and both outer surfaces of the traveling girder fitted between the pair of parallel surfaces and the support leg is in the upright position, the pair of parallel surfaces and the pair of parallel surfaces are fitted therebetween. By the lock pins penetrating both outer surfaces of the traveling girder, the rotation of the support legs with respect to the traveling girder is prevented,
The position of the lock pin when the support leg is in the upright position is substantially immediately above the support leg.
[0009]
According to a third aspect of the present invention, there is provided the portal crane according to the first aspect of the present invention, wherein the rotating shaft is located at an intermediate portion of the traveling girder than a position of the lock pin when the support leg is in the upright position. It is characterized by being arranged close to and apart.
[0010]
A portal crane according to a fourth aspect of the present invention is the portal crane according to the second aspect of the present invention, wherein the lock pin is pulled out to move the support leg from the standing position to the storage position, and the pulled out lock pin is a pair of parallel surfaces. And the rotation of the support legs with respect to the traveling girder is prevented by penetrating both outer surfaces of the traveling girder fitted therebetween.
[0011]
[Action]
According to the first aspect of the present invention, when a plurality of portal cranes with the support legs housed therein are stacked and transported in the same direction, a traveling girder of another portal crane is fitted between the projecting portions and stacked. Even when transported by a vehicle or the like, the portal crane does not shift while being properly aligned.
[0012]
According to the second aspect of the present invention, when the support leg is rotated around the rotation axis, the inner surfaces of the pair of parallel surfaces of the bracket fitted to both side surfaces of the traveling girder slide along both outer surfaces of the traveling girder. Although the gap between the two members of the sliding portion is set to be small to some extent, the inner surfaces of the pair of parallel surfaces of the bracket always slide along the outer surfaces of the traveling girder to smoothly rotate. be able to.
On the other hand, the gap between the inner surface of the pair of parallel surfaces of the bracket through which the lock pin passes and the outer surface of the traveling mold can be set small for the same reason. The pin portion is fixed without play in this axial direction. In addition, the displacement of the support leg with respect to the traveling girder in the direction around the rotation axis is firmly fixed by the rotation shaft and the lock pin, so that the traveling girder and the support leg eventually play in all directions without play. Strongly connected.
[0013]
According to the third aspect of the present invention, since the rotating shaft is disposed at a distance, the support span between the rotating shaft and the lock pin becomes longer, and the supporting shaft is firmly supported. Also, when a plurality of portal cranes are stacked, the fitting portion inside the protruding portion is located near the middle portion of the traveling girder fitted into the support leg when the support leg is stored, and this portion is used for other handling. It is a position where damage is small and plastic deformation of the member is small as compared with both ends of the traveling girder which is easily hit by the material, and good fitting accuracy is always maintained.
[0014]
According to the fourth aspect of the present invention, one lock pin can be used at the time of storage and standing up, and is not only structurally simplified, but also is prevented from being lost because the lock pin is always used.
[0015]
【Example】
Hereinafter, embodiments of the portal crane of the present invention will be described.
The portal crane 1 is used for, for example, railway security work, and as shown in FIG. 1, a pair of left and right parallel traveling girders 2 and support legs 3 and 4 provided at both ends of the traveling girders 2. It comprises a hoist 5 that can move on the traveling girder 2. The hoist 5 is run by running rollers 51, and a heavy object such as a track is suspended by a chain 52 having a rail catch 53 at the end.
[0016]
The pair of left and right parallel running girders 2 are connected and fixed by welding a connecting plate 6 to both ends thereof, and are arranged at a predetermined interval W as shown in FIGS. 2, 4, 6 and 8. I have. The connecting plate 6 is formed with a handle 6a which is bent outward at the lower portion and held at the time of transportation, and a guide 6b is formed on a side portion.
The running roller 51 of the hoist 5 rolls and runs on the parallel running girder 2, and the chain 52 of the hoist 5 hangs down from the space between the parallel running girder 2.
[0017]
As shown in FIG. 6, the traveling girder 2 has one or more reinforcing walls that connect an outer peripheral wall 21 a having a substantially rectangular shape with a longitudinal section that is long in the up-down direction and inner walls in the middle in the up-down direction of the side surfaces of the outer wall. 21b, and the thickness of the side wall of the outer peripheral wall is larger at the upper portion 21a2 and the lower portion 21a3 at the thicknesses D2 and D3 than the thickness D1 at the vertical intermediate portion 21a1. The upper and lower surfaces of the outer peripheral wall are formed such that the thicknesses D5 and D6 of the left portion 21a5 and the right portion 21a6 are larger than the thickness D4 of the middle portion 21a4 in the left-right direction.
[0018]
When the hoisting machine 5 moves on the traveling girder 2 while hanging a heavy object such as a track, a large load is applied to the traveling girder 2. At this time, a compressive stress is applied to the upper surface side of the traveling girder 2 and a tensile stress is applied to the lower surface side. In particular, there is a tendency that the stress at the substantially rectangular corner portion of the longitudinal section of the traveling girder 2 increases.
However, since the corners of the traveling girder 2 are made thicker, the stress is reduced and deformation can be prevented, and the other parts where less stress is applied remain thin, so that the stress applied to the material becomes uniform. The material can be used efficiently, and the weight and cost do not increase much as a whole. Further, a force for shaking the substantially rectangular vertical cross section of the traveling girder 2 acts, but since the reinforcing wall 21b is provided at an appropriate position, shaking is prevented.
[0019]
The longitudinal section of the traveling girder 2 is made of iron having a flange section 21c extending outward on both upper right and left sides to cover the flange section 21c and the traveling girder upper surface 21d, and has a substantially C-shaped longitudinal section. And the rail member 7 made of iron is fixedly fastened with screws 8 at both ends. The iron rail member 7 is formed of stainless steel in this embodiment. In addition, the rail member 7 is fixed to two positions of the elongated holes 9 provided on both sides of the upper surface of the traveling girder 2 by fixing screws 8. When the rail member 7 is bent and deformed, the relative displacement between the two can be absorbed. In addition, since the screws 8 are fitted and fixed at two places, the number of man-hours for fastening and removing the screws is small, and maintenance and inspection are easy. Further, since the intermediate portion of the rail member 7 is not fixed with the screw, the hoisting machine 5 can move on the rail member 7 smoothly.
[0020]
Furthermore, when the hoisting machine 5 moves on the traveling girder while hanging heavy objects such as tracks, wear of the upper surface of the traveling girder 2 becomes a problem. However, since the iron rail member 7 having higher wear resistance than the aluminum alloy is engaged and fixed, there is no problem in terms of wear resistance. Further, since the place where the iron rail member 7 is provided is only on the upper part of the traveling girder 2, the weight does not increase much.
[0021]
Reinforcing plates 10 for attaching the support legs 3 and 4 are welded to the side portions of both ends of the traveling girder 2. A position support hole 12 and a storage position support hole 13 are formed, and a hole 213 is formed at the center of the reinforcing plate 10 for weight reduction. Thus, the reinforcing plates 10 are welded to both outer surfaces of the traveling girder 2 to reinforce the thin traveling girder 2, and the reinforcing plate 10 and both outer surfaces of the traveling girder 2 and the brackets 31 of the support legs 3, 4 are provided. , 41 are penetrated by the rotating shaft 14 and the lock pin 15. In addition, since both the outer surfaces of the traveling girder 2 and the reinforcing plates 10 to be welded to the surfaces are both flat, welding workability is good.
[0022]
The support legs 3 and 4 connected to both ends of the traveling girder 2 are provided so that the traveling girder 2 can be horizontal in use, regardless of the support surface for the supporting legs 3 and 4. Have different lengths (see FIGS. 10 and 11). That is, as shown in FIG. 10, the right supporting leg 3 in FIG. 1 is composed of a pair of columns 32 and upper and lower connecting members 33 and 34, and the length thereof is constant. 35 are welded. Brackets 31 are welded to both sides of the upper part of the support leg 3. On the other hand, as shown in FIG. 11, the left support leg 4 in FIG. 1 includes a pair of outer supports 42, upper and lower connecting members 43 and 44, and inner supports 45. It is slidably fitted, and the length of the support leg 4 can be appropriately adjusted by fixing the outer support 42 and the inner support 45 at a predetermined position with the length adjusting pin 16. I have. That is, a support hole 42a is formed at a lower portion of the outer support 42, reinforcing plates 17 and 18 are welded to both sides of the support hole 42a, and adjustment holes are formed in the inner support 45 at predetermined intervals in the axial direction. 45a is formed, and a ground plate 46 is welded to a lower portion. Further, brackets 41 are welded to both sides of the upper part of the support leg 4.
[0023]
As shown in FIG. 13, the support leg length adjusting pin 16 includes a pin 161, a snap pin 162, and a wire 163. One end 163 a of the wire 163 is connected to the pin 161. The other end 163b of the wire 163 is inserted into the ring-shaped connecting portion 162a of the snap pin 162, and is fixed to the snap pin 162 by being inserted into the hole 161a. Are linked. Therefore, the snap pin 162 does not fall off the wire 163.
[0024]
The length of the support leg 4 is adjusted so that the traveling girder 2 is horizontal by sliding the inner support 45 with respect to the outer support 42, and the adjustment hole 45 a of the inner support 45 is aligned with the support hole 42 a of the outer support 42. Then, the outer support 42 and the inner support 45 are locked by inserting the pin 161 of the support leg length adjusting pin 16, and the snap pin 162 is inserted into the hole 161 b of the pin 161 to prevent the pin 161 from coming off.
[0025]
Rotation shaft mounting holes 31a, 41a are formed in the brackets 31, 41 on the upper portions of the left and right support legs 3, 4, and the two ends of the pair of left and right traveling girders 2 are rotated from the rotation shaft mounting holes 31a, 41a. The rotating shaft 14 is inserted through the shaft supporting hole 11, and the upper portions of the left and right support legs 3 and 4 are rotatably connected via the rotating shaft 14, and are locked by the lock pin 15 in the standing position and the storage position, respectively. Is done. As shown in FIG. 12, the lock pin 15 includes a pin 151, a snap pin 152, and a wire 153. One end 153a of the wire 153 is inserted into the hole 151a of the pin 151 and is fixed with a caulking ring 154, and the other end 153b of the wire 153 is inserted into the ring-shaped connecting portion 152a of the snap pin 152 and caulked. By fixing with the ring 155, it is connected to the snap pin 152. Therefore, the snap pins 152 do not fall off the wires 153.
[0026]
The brackets 31 and 41 of the left and right support legs 3 and 4 are formed with upright position mounting holes 31b and 41b and storage position mounting holes 31c and 41c. At the time of use, the upright position mounting holes 31b and 41b of the brackets 31 and 41 are aligned with the upright position support holes 12 on both sides of the traveling girder 2, and the pins 151 of the lock pins 15 are inserted through the holes. The snap pin 152 is inserted into the hole 151b to prevent the hole 151b from coming off. During transportation, the storage position mounting holes 31c and 41c of the brackets 31 and 41 are aligned with the storage position support holes 13 on both sides of the traveling girder 2, and the pins 151 of the lock pins 15 are inserted through the holes. The snap pin 152 is inserted into the hole 151b of the hole 151 to prevent the hole 151 from falling out.
[0027]
As described above, the support legs 3 and 4 are provided at the left and right end portions of the traveling girder 2 and support the traveling girder 2 about a rotation axis 14 provided in a direction orthogonal to the longitudinal direction of the traveling girder 2 and in the horizontal direction. The standing position where the legs 3 and 4 are substantially orthogonal to each other, and the lower part of the support legs 3 and 4 move toward the middle part of the traveling girder 2 so that the supporting legs 3 and 4 and the traveling girder 2 are substantially parallel. Support legs 3 and 4 are provided rotatably at the storage position. Brackets 31, 41 fixed to the upper portions of the support legs 3, 4 are supported by the rotating shaft 14, and the brackets 31, 41 are fitted in a pair of parallel surfaces 31d, 41d fitted along both outer surfaces of the traveling girder 2. When the rotating shaft 14 passes through the pair of parallel surfaces 31d and 41d and both outer surfaces of the traveling girder 2 fitted therebetween and the support leg 2 is in the upright position, the pair of parallel surfaces 31d , 41d and the lock pins 15 penetrating both outer surfaces of the traveling girder 2 fitted therebetween prevent rotation of the supporting legs 3, 4 with respect to the traveling girder 2, and the supporting legs 3, 4 are in the upright position. The position of the lock pin 15 is almost immediately above the support legs 3 and 4.
[0028]
When the support legs 3 and 4 are rotated around the rotation shaft 14, the inner surfaces of the pair of parallel surfaces 31 d and 41 d of the brackets 31 and 41 fitted to both side surfaces of the traveling girder 2 are both outer surfaces of the traveling girder 2. The inner surfaces of the pair of parallel surfaces 31d and 41d of the brackets 3 and 4 always extend along both outer surfaces of the traveling girder 2 even if the gap between the two members of the sliding portion is small to some extent. It can slide and rotate.
[0029]
On the other hand, the gap between the inner surfaces of the pair of parallel surfaces 31d and 41d of the brackets 3 and 4 through which the lock pin 15 penetrates and both outer surfaces of the traveling girder 2 can be set small for the same reason. The portions of the rotating shaft 14 and the lock pin 15 which are the connecting portions of the traveling girder 2 are fixed without any play in the axial direction. The displacement of the support leg 2 with respect to the traveling girder 2 in the direction around the rotation axis 14 is ultimately fixed by the rotation shaft 14 and the lock pin 15. 4 is firmly connected without play in all directions.
[0030]
The brackets 31, 41 fixed to the upper portions of the support legs 3, 4 have a pair of parallel surfaces 31d, 41d fitted along both outer surfaces of the traveling girder 2, and a pair of parallel surfaces 31d, 41d. When the rotating shaft 14 penetrates both outer surfaces of the running girder 41 and the running girder 2 fitted therebetween, and the supporting legs 3 and 4 are stored, a part of the pair of parallel surfaces 31 d and 41 d The outer width of the pair of left and right traveling girders 2 is substantially equal to the width of the outer lateral surface of the pair of left and right traveling girders 2.
[0031]
Therefore, as shown in FIG. 14, when a plurality of portal cranes 1 in which the support legs 3 and 4 are housed are stacked and transported in the same direction, another traveling of the portal cranes 1 between the protrusions 31e and 41e. When the girders 2 are fitted and stacked, even when transported by a vehicle or the like, the portal crane 1 is kept aligned and does not shift. Therefore, when a plurality of portal cranes 1 are stacked and transported, it is not necessary to separately provide a special frame body in order to align the portal cranes 1 so that the portal cranes 1 do not shift.
In addition, the rotation shaft 14 is disposed at a position closer to the intermediate portion of the traveling girder 2 than the position of the lock pin 15 when the support leg 2 is in the upright position. As described above, since the rotating shaft 14 is disposed at a distance, the support span between the rotating shaft 14 and the lock pin 15 is long and is firmly supported. The lock pin 15 is lightweight because the pin 151 is made of a pipe material, and its tip is reduced in diameter by pressing to make it easier to insert.
[0032]
When a plurality of portal cranes 1 are stacked, the fitting portions inside the protruding portions 31e and 41e of the brackets 31 and 41 are positioned between the running girders 2 fitted therein when the support legs 2 are stored. It is located near the part, and this part is less damaged and less plastically deformed than the both ends of the traveling girder 2 which is easy to hit with other materials during handling, so that good fitting accuracy is always maintained. You.
Further, the lock pin 15 is pulled out to move the support leg 3 from the upright position to the storage position, and the pulled out lock pin 15 passes through the pair of parallel surfaces 31d, 41d and both outer surfaces of the traveling girder 2 fitted therebetween. The rotation of the support legs 3 and 4 with respect to the traveling girder 2 is prevented.
[0033]
One lock pin 15 can be used at the time of storage and standing up, and is not only structurally simplified, but also is not lost because the lock pin 15 is always used.
When a load is applied on the traveling girder 2 when the support legs 3 and 4 are in the standing position, a load is mainly applied to the lock pin 15. Therefore, the lock pin 15 may be the weakest part of each member, for example, a low-strength material, or may be a pipe as in this embodiment. When the strength is appropriately set and exceeds the allowable lifting load of the hoisting machine 5, the lock pin 15 is plastically deformed, so that the operator can immediately recognize that the load is higher than the allowable lifting load. In addition, one lock pin 15 is used at the time of storage and standing, and is pulled out or inserted, so that the operator can pick it up every time, so that the operator can more easily notice.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the rotating shaft penetrates the parallel surface of the bracket fixed to the upper portion of the support leg and both outer surfaces of the traveling girder fitted between the bracket, and accommodates the support leg. Then, each part of the pair of parallel surfaces protrudes from the support leg to the opposite side to the traveling girder, and the inner width dimension of each protrusion is such that the outer surface portions of the pair of left and right traveling girder can be fitted and the outer surface portion width. Since it is set to be approximately equal to the dimensions, when stacking and transporting multiple portal cranes with the support legs stored in the same direction, fit the traveling girder of another portal crane between the protrusions By stacking, the portal cranes remain aligned properly even when transported by vehicle, etc., and when transporting multiple portal cranes by stacking, the portal cranes aligned and stacked are shifted. Special frame to prevent It is not necessary to provide the number.
[0035]
According to a second aspect of the present invention, when the support leg is in the upright position, the rotation of the support leg with respect to the traveling girder is performed by a lock pin that penetrates the pair of parallel surfaces and both outer surfaces of the traveling girder fitted therebetween. The position of the lock pin when the support leg is in the upright position is substantially immediately above the support leg, so that when the support leg is rotated around the rotation axis, the lock pin is fitted to both side surfaces of the traveling girder. The inner surfaces of the pair of parallel surfaces of the bracket slide along both outer surfaces of the traveling girder, but the inner surfaces of the pair of parallel surfaces of the bracket always run even if the gap between both members of this sliding portion is small to some extent. It can slide and rotate along both outer sides of the spar.
[0036]
On the other hand, the gap between the inner surface of the pair of parallel surfaces of the bracket through which the lock pin penetrates and the outer surfaces of the traveling girder can be reduced for the same reason. The pin portion is fixed without play in the axial direction. In addition, since the displacement of the support leg relative to the traveling girder in the direction around the rotation axis is firmly fixed by the rotation shaft and the lock pin, after all, the traveling girder and the support leg have no backlash in all directions. It is firmly connected in the state.
[0037]
According to the third aspect of the present invention, since the rotating shaft is disposed apart from the rotating shaft, the supporting span between the rotating shaft and the lock pin is long and is firmly supported. In addition, when stacking a plurality of portal cranes, the fitting part inside the protrusion is located near the middle part of the traveling girder that is fitted when the support legs are stored, and this part is This is a position where damage is less and plastic deformation of the member is less than both ends of the traveling girder which is easily hit by other materials, and good fitting accuracy is always maintained.
[0038]
According to the fourth aspect of the present invention, one lock pin can be used at the time of storage and standing, and not only is the structure simplified, but also the lock pin is always used, so that it is not lost.
[Brief description of the drawings]
FIG. 1 is a front view of a portal crane.
FIG. 2 is a plan view of a portal crane.
FIG. 3 is a front view of a mounting portion of a support leg.
FIG. 4 is a plan view of a mounting portion of a support leg.
FIG. 5 is a partial side view of the portal crane.
FIG. 6 is a sectional view taken along line AA of FIG. 3;
FIG. 7 is a front view of the traveling girder.
FIG. 8 is a plan view of a traveling girder.
FIG. 9 is a side view of the traveling girder.
FIG. 10 is a side view of one support leg.
FIG. 11 is a side view of the other support leg.
FIG. 12 is a side view of a lock pin.
FIG. 13 is a side view of a support leg length adjusting pin.
FIG. 14 is a view showing a transport state of the portal crane.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Portal crane 2 ... Travel girder 3, 4 ... Support leg 5 ... Hoist 21a ... Outer peripheral wall 21b ... Reinforcement wall

Claims

The hoist can travel on a pair of left and right parallel running girders supported by support legs,
An upright position where the traveling girder and the support leg are substantially perpendicular to a rotation axis provided in a direction orthogonal to the longitudinal direction of the traveling girder and in a horizontal direction, and a lower portion of the support leg is an intermediate portion of the traveling girder. The support legs are provided at the left and right ends of the traveling girder so that the supporting legs and the traveling girder can rotate to a storage position where the traveling girder is substantially parallel to the traveling girder,
A bracket fixed to the upper part of the support leg is supported by the rotating shaft, and the bracket has a pair of parallel surfaces fitted along both outer sides of the traveling girder,
The rotating shaft penetrates the pair of parallel surfaces and both outer surfaces of the traveling girder fitted therebetween.
When the support leg is stored, a part of each of the pair of parallel surfaces protrudes from the support leg to a side opposite to a traveling girder,
A portal crane, wherein an inner width dimension of each of the protrusions is set so that outer side portions of the pair of left and right traveling girders can be fitted and substantially equal to the outer side portion width size.

The hoist can travel on a pair of left and right parallel running girders supported by support legs,
An upright position in which the traveling girder and the support legs are substantially perpendicular to a rotation axis provided in a direction perpendicular to the longitudinal direction of the traveling girder and in a horizontal direction; The support legs are provided at the left and right ends of the traveling girder so that the supporting legs and the traveling girder are rotatable to a storage position where the traveling girder is substantially parallel.
A bracket fixed to an upper portion of the support leg is supported by the rotating shaft, and the bracket has a pair of parallel surfaces fitted along both outer surfaces of the traveling girder,
The rotating shaft penetrates the pair of parallel surfaces and both outer surfaces of the traveling girder fitted therebetween.
When the support leg is in the upright position, a lock pin that penetrates the pair of parallel surfaces and both outer surfaces of the traveling girder fitted therebetween prevents rotation of the support leg relative to the traveling girder,
The portal crane, wherein the position of the lock pin when the support leg is in the upright position is substantially immediately above the support leg.

The portal type according to claim 1, wherein the rotation shaft is disposed at a position closer to an intermediate portion of the traveling girder than a position of the lock pin when the support leg is in an upright position. crane.

The lock pin is pulled out to move the support leg from the upright position to the storage position, and the pulled out lock pin passes through the pair of parallel surfaces and both outer surfaces of the traveling girder fitted between the pair of parallel surfaces, and 3. The portal crane according to claim 2, wherein the support leg is prevented from rotating with respect to the girder.