JP3575513B2

JP3575513B2 - Underground structure lid locking structure

Info

Publication number: JP3575513B2
Application number: JP32990396A
Authority: JP
Inventors: 正和樋▲高▼; 和実田中; 教三佐原
Original assignee: Hinode Ltd
Current assignee: Hinode Ltd
Priority date: 1996-12-10
Filing date: 1996-12-10
Publication date: 2004-10-13
Anticipated expiration: 2016-12-10
Also published as: JPH10168923A

Description

【０００１】
【発明の属する技術分野】
本発明は、地下構造物用蓋の施錠構造に関し、詳しくは蓋本体とこの蓋本体を支持する受枠とを施錠可能にする地下構造物用蓋の施錠構造に関する。
尚、本願明細書でいう「地下構造物用蓋」とは、下水道における地下埋設物、地下構造施設等と地上とを通じる開口部を閉塞する大型鉄蓋、マンホール蓋、汚水桝蓋、電力・通信における地下施設機器や地下ケーブル等を保護する開閉可能な共同溝用鉄蓋、送電用鉄蓋、配電用鉄蓋、上水道やガス配管における路面下の埋設導管およびその付属機器と地上とを結ぶ開閉扉としての機能を有する消火栓蓋、制水弁蓋、仕切弁蓋、空気弁蓋、ガス配管用蓋、量水器蓋等を総称する。
【０００２】
【従来の技術】
各種の地下構造物用蓋は、地下構造物の上端に設置されて路面等の地上に開口する受枠と、該受枠にテーパ嵌合等によって開口部を覆う蓋本体とを備え、蓋本体を蝶番構造によって受枠に取り付け、開蓋したときに該受枠に対して水平面内で旋回、または地面側に反転できるようにし、更に蓋本体と受枠とを施錠するための施錠構造を設けるものが一般的である。
【０００３】
受枠と蓋本体とを施錠するための施錠構造としては、例えば、実公昭６３−１５３９１号公報に記載されているものがある。この施錠構造は、受枠と係合して錠止する施錠鉤を蓋本体の裏面に回転可能に枢支した地下構造物用蓋において、蓋本体を貫通する螺杆を有した施錠鉤の揺動防止装置を取り付け、螺杆は、その上下両端に蓋本体に螺合する螺子を形成し、錠止時に該螺杆の下部側を施錠鉤に当接させるようにし、揺動防止装置により施錠鉤が揺動するのを防止して、地下構造物内部の乱流揚圧によって解錠されないように、錠止状態を確実に維持し、蓋本体が飛散することを防止するようにしたものである。
【０００４】
【発明が解決しようとする課題】
上述した施錠構造にあっては、揺動防止装置で施錠鉤の揺動を確実に防止して蓋本体が飛散することを防止しているが、開蓋する必要がある場合には、先ず揺動防止装置と施錠鉤との当接を解除した後、開蓋冶具のバールをバール孔に挿入させて施錠鉤のバール受圧部を押圧して解錠すると共に、蓋本体と受枠との食い込み力を開放して開蓋しなければならないため、開蓋操作が煩わしいものであった。更に、消火栓鉄蓋、配電用鉄蓋、ガス配管用鉄蓋等の地下構造物用蓋を緊急時に開蓋する必要がある場合には、開蓋操作に手間取ってしまい迅速に対応することが出来ないという問題がある。
【０００５】
本発明は、上述の点に鑑みてなされたもので、地下構造物内部の乱流揚圧によって解錠せず、開蓋する必要がある場合には、開蓋操作とは別の解錠操作を必要とせずに開蓋できるようにした地下構造物用蓋の施錠構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は、蓋本体の裏面に施錠手段を設け、前記蓋本体を支持する受枠に前記施錠手段と係合する係止手段を設けた地下構造物用蓋の施錠構造において、前記係止手段は、前記受枠内面に設けられた凹部と、前記凹部の上部に突設された係止部と、前記凹部の下部から該受枠内方に突設された棚部とからなり、前記施錠手段は、前記蓋本体の裏面に垂設されたブラケットに前記凹部に臨んで横設固定された支持軸と、この支持軸を挿通させた施錠鉤とからなり、前記施錠鉤は、前記支持軸が挿通されて上下方向に移動可能なスライド溝と、前記棚部に載置されたときに前記凹部に収納され、揚圧等による蓋本体上昇時に前記係止部と係合して施錠される係合爪部と、閉蓋状態で施錠鉤を前記棚部に載置したときに前記支持軸よりも上方に位置し、蓋本体の開閉操作時に前記支持軸を取り込んで該施錠鉤を支持軸回りに傾動させるスライド溝の少なくとも中途に形成した傾動部と、施錠鉤を前記支持軸回りに傾動不能とする前記傾動部を除くスライド溝に形成した傾動不能部と、前記開蓋操作時に前記受枠の内面に当接して該施錠鉤の傾動支点となる当接部とが設けられたことを特徴とする。
【０００７】
このような構成とすることで、閉蓋状態において、地下構造物内部の乱流揚圧によっても施錠鉤は傾動しないし、また、受枠に支持されている蓋本体が真上に押し上げられると、該蓋本体と共に支持軸が施錠鉤のスライド溝内を上方に移動し、該スライド溝の上端に当接して該施錠鉤を真上に持ち上げる。施錠鉤は、スライド溝に形成した傾動部を除く傾動不能部に支持軸が位置しているときには傾動しないため、凹部に収納されている係合爪部が係止部に係合される。これにより蓋本体が受枠にロックされ、飛散するのを防止している。
【０００８】
開蓋操作により蓋本体が斜め上方に持ち上げられると、支持軸が施錠鉤のスライド溝内を上動して傾動部に入り込むと共に、当接部が受枠の内面に当接して傾動支点として作用し、該施錠鉤の下部が受枠中心側に移動するように支持軸回りに傾動され、係合爪部が係止部と係合不能とされて解錠される。これにより蓋本体の開蓋が可能となる。
【０００９】
閉蓋操作時にあっては、支持軸を施錠鉤の傾動部に入り込ませて該施錠鉤を支持軸回りに傾動し、係合爪部が受枠の内面に当接するように下降させ、更に係止部を乗り越えて下降させる。蓋本体が受枠に載置されると施錠鉤が棚部に載置されて支持され、係合爪部が凹部内に収納されて係止部と係合可能に対向される。
【００１０】
【発明の実施の形態】
本発明においては、傾動部は、スライド溝の中途に開蓋操作時に支持軸を取り込む第１傾動部を形成すると共に、下端には閉蓋操作時に支持軸を取り込む第２傾動部を形成し、閉蓋状態において、支持軸が第１傾動部と第２傾動部との間の傾動不能部に位置する構成としている。このような構成としたことによって、閉蓋状態での施錠鉤の傾動が防止されるとともに、閉蓋操作時に施錠鉤を受枠の上縁に載置して蓋本体を受枠内に斜め下方に落とし込むと、支持軸が第２傾動部に取り込まれて施錠鉤が傾動するため、施錠鉤が受枠内に落とし込まれて閉蓋を容易に行うことができる。
【００１１】
本発明では、前記支持軸は、断面形状が前記スライド溝よりも僅かに幅狭い矩形とされている。
支持軸の断面形状を矩形とすることで施錠鉤のスライド溝に沿って上下動し、施錠鉤が傾動するのを防止している。好ましくは、支持軸の断面形状をスライド溝の長手方向に沿って縦長の矩形とすることで、施錠鉤の傾動を良好に防止することができる。
【００１２】
更に、本発明では、施錠鉤の当接部は、スライド溝の中途に形成した傾動部と略同じ高さ位置若しくは僅かに低い位置に形成した構成としている。
このような位置に当接部を設けることによって、開蓋時に受枠の内面に当接して該施錠鉤の傾動支点として作用する場合に、施錠鉤の傾動を容易としている。更に、本発明では、前記傾動部は、スライド溝の係合爪側の内面を略円弧状に切り欠いた構成としたり、または、傾動部の内面と当接する支持軸の角部を曲面とした構成とすることによって、開蓋操作および閉蓋操作時における施錠鉤の支持軸回りの傾動を容易にしている。
【００１３】
また、傾動部の内面を略円弧状とするとともに、この内面と当接する支持軸の角部を曲面としておくことによって、両者が滑らかに摺動可能となり施錠鉤の支持軸回りの傾動がさらに容易となる。
（実施例）
図１は、本発明に係る地下構造物用蓋の施錠構造の断面図を示す。図１において地下構造物用蓋１は、受枠２と蓋本体３とにより構成された平面視円形としており、その上面が地上面（ＧＬ）と面一をなして設置されている。受枠２は、その内周上面をテーパ状とした蓋本体３との嵌合面２ａを形成し、蓋本体３は、縁巻３ａの外周面をテーパ状に縮径して嵌合面２ａに当接させている。この蓋本体３は、蝶番構造（図示せず）により受枠２に開閉可能に連結されており、受枠２に対して蓋本体３を持ち上げながら手前側に斜め上方に持ち上げ、水平旋回または反転させることで、開蓋可能としている。そして、受枠２と蓋本体３との間には、前記蝶番構造と反対側の位置に受枠２側に設けた係止手段５と蓋本体３側に設けた施錠手段６とからなる施錠構造４が設けられている。
【００１４】
尚、上述した蝶番構造は、例えば、受枠２の内周に環状の蝶番座を突出して設け、その中に蓋本体３の裏面に揺動可能に取り付けた蝶番金物を差し込んだ構造の地下構造物用蓋では周知のものが採用できる。この蝶番構造は、蝶番金物が蝶番座に差し込まれた状態において該蝶番座に対して前後方向にある程度の自由度を持つものであり、本実施例においてもこのような蝶番構造を備えることで、開蓋時には蓋本体３を手前側に斜め上方に引き上げることが可能となっている。また、蓋本体３は、地下構造物内部の乱流揚圧を受けたときには蝶番構造の長さ分だけ真っ直ぐに押し上げられる。
【００１５】
受枠２は、図２に示すようにその内周上面に蓋本体３を嵌合支持する嵌合面２ａを形成し、下部には段差部２ｃを介して該嵌合面２ａよりも僅かに小径の内周面２ｂを形成している。係止手段５は、内周面２ｂに形成されている凹部７と、該凹部７の開口下端に該受枠２の内方に向かって略水平に突設された棚部８と、凹部７の開口上端に周方向に沿って突設された係止部９とにより構成されている。尚、棚部８は、受枠２内を作業者が出入りする際に邪魔にならない程度の長さとされている。
【００１６】
蓋本体３は、図３に示すように上面３ｂの周縁部に受枠２の係止手段５と対応する位置に下方に袋状に膨出するバール孔３ｃが設けられている。そして、この蓋本体３の裏面には、バール孔３ｃを形成する袋部３ｄの左右両側、且つ縁巻３ａから僅かに内側位置に一対のブラケット１１、１１が下方に垂設されている。これらのブラケット１１、１１は、図１に示すように蓋本体３が受枠２に嵌合支持された閉蓋状態において、凹部７と離隔対向し、且つ下端が棚部８から僅かに離隔する。そして、各ブラケット１１の下部には多角形例えば、高さが幅よりも僅かに長い長方形の角孔１１ａが対向して穿設されている。
【００１７】
前記角孔１１ａには後述する施錠鉤１５のスライド溝１７に挿通する支持軸１２が横設されている。該支持軸１２は、ブラケット１１の角孔１１ａに嵌合挿通する断面形状が長方形の角柱をなし、且つブラケット１１、１１の外法と同じ長さに設定された軸部１２ａを形成するとともに、一端に頭部１２ｂが、他端にねじ部１２ｃが形成されている。そして、軸部１２ａの上面と蓋本体３の外側に臨む外側面とのなす角部が全長に亘り面取りされて曲面１２ｄとされている。
【００１８】
施錠鉤１５は、両側のブラケット１１、１１の間に収納可能とされ、鉤本体１５ａの上部両側には側部１５ｂ、１５ｂを立ち上げ、その中間には収納空間１５ｃを設けている。この収納空間１５ｃは、後述するように蓋本体３が閉蓋されているときに袋穴であるバール孔３ｃを形成する袋部３ｄを収納している。施錠鉤１５は、その横幅を凹部７の開口幅よりも僅かに短く設定し、前面下部に略Ｌ字状の係合爪部１６を前方に突出させるとともに、凹部７内に係止部９と対向して収納可能とされている。
【００１９】
施錠鉤１５には、鉤本体１５ａおよび上方に立ち上げた側部１５ｂ、１５ｂに上下方向に長いスライド溝１７が設けられている。このスライド溝１７は、支持軸１２の縦断面形状の幅よりも僅かに幅広く、支持軸１２が僅かな間隙を存して上下方向に移動可能とされている。そして、スライド溝１７の係止爪部１６側（前側）の内面１７ａには、上部に第１傾動部１８が、下端に第２傾動部１９が略円弧状に切欠されている。これらの第１傾動部１８は開蓋時に、第２傾動部１９は閉蓋時に、それぞれ支持軸１２を取り込んで、支持軸１２回りに施錠鉤１５を傾動可能としている。即ち、図５に示すように第１傾動部１８は、上部に円弧状をなす上面１８ａを、下部に傾斜面１８ｂを有している。また、第２傾動部１９は、上面１９ａを円弧状とした扇形状としている。
【００２０】
また、スライド溝１７の上端には上傾動不能部１７ｂを、スライド溝１７の第１傾動部１８と第２傾動部１９との間には下傾動不能部１７ｃを形成し、該上および下傾動不能部１７ｂ、１７ｃに支持軸１２が位置したとき、施錠鉤１５は、支持軸１２回りに傾動しないようにしている。
施錠鉤１５の両側部１５ｂ、１５ｂの前面上部には、第１傾動部１８と略対応する高さ位置に当接部１５ｄ、１５ｄが前方に膨出して形成されている。これらの当接部１５ｄ、１５ｄは、開蓋操作時に支持軸１２が施錠鉤１５の第１傾動部１８に取り込まれるとともに、受枠２に形成した凹部７の開口上端に形成した係止部９および嵌合面２ａに順次当接摺動することによって、施錠鉤１５が支持軸１２回りに傾動する際の傾動支点である。
【００２１】
図１、図３および図４に示すように施錠鉤１５は、ブラケット１１、１１の間に、係止爪部１６が凹部７内に収納されるように配置され、支持軸１２の軸部１２ａが一側のブラケット１１の角孔１１ａ、施錠鉤１５のスライド溝１７、他側のブラケット１１の角孔１１ａを挿通し、ねじ部１２ｃに座金１３を介してナット１４が螺合されて、頭部１２ｂとナット１４とにより固定される。
【００２２】
また、図５に示すように支持軸１２は、２点鎖線１２’で示すようにスライド溝１７の下端面に当接した位置において第２傾動部１９に入り込むことが可能とされ、また、支持軸１２は、第１傾動部１８の下端位置において傾斜面１８ｂに沿って該第１傾動部１８内に入り込むことが可能とされる。施錠鉤１５は、支持軸１２が第１傾動部１８、または第２傾動部１９に入り込んだときに該支持軸１２に対して傾動（回動）可能とされ、その他の位置即ち、実線で示すように支持軸１２がスライド溝１７の略中間に形成した下傾動不能部１７ｃに位置しているとき、または２点鎖線１２”で示すようにスライド溝１７の上端に形成した上傾動不能部１７ｂに位置しているときには傾動不能とされる。
【００２３】
図１に示すように地下構造物用蓋１の施錠構造４は、蓋本体３が受枠２に支持嵌合されて閉蓋されている状態において、施錠鉤１５が自重により垂下して棚部８に載置され、係合爪部１６が凹部７内に入り込み、且つ係止部９の下方に位置して該係止部９と係合可能に対向している。また、施錠鉤１５の当接部１５ｄが係止部９の端面に僅かに当接している。尚、当接部１５ｄは、係止部９の端面に当接している必要はなく、僅かに離隔していても良い。また、このような閉蓋状態において、支持軸１２は、施錠鉤１５に形成したスライド溝１７の下端との間に隙間を有するように下傾動不能部１７ｃに位置するとともに、施錠鉤１５の上端と蓋本体３の裏面との間には、前記支持軸１２とスライド溝１７下端との隙間よりも広い隙間を有している。
【００２４】
次に、図６乃至図８により施錠構造４の動作を説明する。
先ず、図６（ａ）〜（ｆ）を参照して地下構造物内部に発生した乱流揚圧が蓋本体３に作用して押し上げるときの施錠構造４のロック動作について説明する。図６（ａ）は、蓋本体３が受枠２に嵌合支持されている状態を示す。施錠鉤１５は、自重により棚部８に載置され、係合爪部１６が凹部７内に入り込み、係止部９の下方において該係止部９と対向している。この状態において、支持軸１２の下面が施錠鉤８のスライド溝１７の下端面よりも僅かに上方に位置し、該支持軸１２の上部が下傾動不能部１７ｃに位置していることから、施錠鉤１５の傾動が防止される。
【００２５】
この状態において、蓋本体３の裏面に乱流揚圧が作用した場合、施錠鉤１５は、棚部８によって揚圧を受けにくいだけでなく、支持軸１２が下傾動不能部１７ｃに位置していることから、不動状態のまま蓋本体３が（ｂ）図に矢印Ａで示すように真上に押し上げられて浮き上がると、これに伴い支持軸１２がスライド溝１７内を移動する。蓋本体３が更に押し上げられて（ｃ）図に示すように受枠２から外れて浮き上がると、支持軸１２がスライド溝１７の上端に形成した上傾動不能部１７ｂに当接する。
【００２６】
蓋本体３が更に押し上げられると、これに伴い（ｄ）図、（ｅ）図に示すように支持軸１２が施錠鉤１５を真上に引き上げる。このとき施錠鉤１５は、支持軸１２が上傾動不能部１７ｂに位置しているため傾動が防止されながら略直立な状態を保持して引き上げられ、係合爪部１６が、凹部７内を真上に移動する。そして、（ｆ）図に示すように施錠鉤１５の係合爪部１６が係止部９に係合すると、該施錠鉤１５が係止されて蓋本体３の浮上が阻止され、地下構造物内部の乱流揚圧による蓋本体３の飛散が防止される。
【００２７】
次に、図７（ａ）〜（ｆ）を参照して蓋本体３を開蓋する場合の施錠構造４の解錠動作について説明する。
作業者は、図１において、蓋本体３のバール孔３ｃに図示しない専用のバールの先端を挿入して受枠２と蓋本体３との食い込みを解除し、図７（ａ）に矢印Ｂで示すように該蓋本体３を手前側に引き寄せながら斜め上方に引き上げると、支持軸１２は、蓋本体３が斜め上方に引き上げられるに伴い施錠鉤１５のスライド溝１７内を下傾動不能部１７ｃの内面１７ａを摺動しながら上方に移動し、第１傾動部１８の傾斜面１８ｂを滑動して該第１傾動部１８内に入り込む。一方、施錠鉤１５は、未だ棚部８上に載置されており、係合爪部１６が係止部９と対向し、当接部１５ｄが係止部９の端面に当接している。
【００２８】
蓋本体３が更に斜め上方に引き上げられると、第１傾動部１８に形成した円弧状の上面１８ａが支持軸１２に形成した曲面１２ｄに対して摺動しながら（ｂ）図に示すように支持軸１２が施錠鉤１５を持ち上げ始める。このとき施錠鉤１５は、第１傾動部１８を力点、係止部９の端面に当接している当接面１５ｄを傾動支点として図中反時計方向に回動する力を受け、前側下端縁が棚部８を滑動しながら後方（反時計方向）に傾動する。蓋本体３が更に斜め上方に引き上げられると（ｃ）図に示すように施錠鉤１５は、更に傾動し、係合爪部１６が凹部７から抜け出して係止部９との係合を不能とされる。このとき施錠鉤１５の前側上端縁が嵌合面２ａに当接して施錠鉤１５の傾動が安定して保持される。
【００２９】
施錠鉤１５は、蓋本体３が斜め上方に引き上げられるに伴い（ｄ）図に示すように当接部１５ｄが係止部９の端面から嵌合面２ａに当接し、該嵌合面２ａを摺動しながら前記傾動状態を保持したまま引き上げられる。そして、係合爪部１６は、係止部９と僅かな間隙を存して該係止部９の内側（受枠２の内方寄り）を通り抜ける。
【００３０】
蓋本体３が更に斜め上方に引き上げられ、（ｅ）図に示すように施錠鉤１５の当接部１５ｄが受枠２の嵌合面２ａから外れると、係合爪部１６が嵌合面２ａと当接しながら引き上げられ、（ｆ）図に示すように受枠２の上端に載置される。以後、蓋本体３は、通常の開蓋操作により、水平旋回または反転によって開蓋される。
【００３１】
蓋本体３のバール孔３ｃは、袋状としたことにより、開蓋の際にバールで施錠鉤１５を直接操作することが出来ないため、上述したような受枠２の外側に斜め上方に引き上げる開蓋操作を行わないと施錠構造４を解錠させて開蓋することが出来ない。即ち、地下構造物の維持管理者等の当業者でない者が蓋本体３を真上に持ち上げようとしても図６に示すようにロックされて開蓋することができない。しかしながら、前記当業者は、開蓋する必要がある場合には上述したように一連の開蓋操作で即ち、開蓋操作とは別の解錠操作を必要とせずに容易に解錠させて開蓋することが出来る。
【００３２】
次に、図８（ａ）〜（ｆ）を参照して閉蓋する場合の施錠構造４の施錠動作を説明する。
蓋本体３を閉蓋する場合には、先ず、作業者が蓋本体３を持ち上げて図８（ａ）に示すように施錠鉤１５を受枠２の上端に直立するように載置する。この状態において、施錠鉤１５の上端面が蓋本体３の裏面から僅かに離隔するとともに、支持軸１２が下傾動不能部１７ｃを外れて下面が施錠鉤１５のスライド溝１７の下端面に当接し、第２傾動部１９内に入り込むことが可能とされることによって、施錠鉤１５が傾動可能とされている。
【００３３】
次いで、作業者が前記専用バールにより蓋本体３を蝶番側に押しながら受枠２内に（ｂ）図に矢印Ｃで示すように斜め下方に落とし込む。施錠鉤１５は、蓋本体３が押されるに伴い受枠２の上端面上を滑動し、（ｂ）図に示すように下面が上端面から外れると、受枠２の開口上端と当接している前側下端縁を傾動支点として図中時計方向（後方）に傾動し、これに伴い支持軸１２が第２傾動部１９内に入り込む。蓋本体３が斜め下方に落とし込まれるに伴い（ｃ）、（ｄ）図に示すように施錠鉤１５は、係合爪部１６が受枠２の嵌合面２ａを滑動しながら下降し、（ｅ）図に示すように施錠鉤１５の後側下端縁が棚部８に当接する。
【００３４】
そして、（ｆ）図に示すように蓋本体３が受枠２内に嵌合されて閉蓋されると、施錠鉤１５は、係合爪部１６が上方に略Ｌ字状に開口する形状とされているために係止部９と係合することなく簡単に乗り越えて図中反時計方向（前側）に回動し、下面が棚部８に当接して垂直に支持される。そして、施錠鉤１５の係合爪部１６が凹部７内に収納され、係止部９の下方に位置して該係止部９と係合可能に対向して施錠される。このように作業者は、閉蓋の際に蓋本体３を支持しながら受枠２に嵌合させるのではなく、受枠２の上端に施錠鉤１５が直立状態に載置されるように蓋本体３を置き、そのまま受枠２内に滑り込ませ（斜め下方に落とし込ませる）ようとする閉蓋の一連の操作で施錠を同時に行うことができる。
【００３５】
なお、閉蓋操作が容易となるように、傾動部として施錠鉤１５のスライド溝１７の下端に第２傾動部１９を設けたが、傾動部は第１傾動部１８だけでもよい。この場合の閉蓋操作は、受枠２上端に施錠鉤１５を載置した状態から蓋本体３を僅かに持ち上げて支持軸１２を第１傾動部１８に位置させ、手で施錠鉤１５を傾動させて受枠内周面２ａに施錠鉤１５を摺動させるようにして閉蓋する。
【００３６】
なお、上記実施例においては、蓋本体３のバール孔３ｃを袋状のバール孔としたが、これに限るものではなく、従来から一般に採用されている開放バール孔としても良い。しかしながら、実施例のように袋状のバール孔とした方が、当業者以外の第三者による開蓋を防止することが出来ると共に、雨水等の侵入を防止することが出来る点で好ましい。
【００３７】
また、上記実施例において、支持軸１２は、施錠鉤１５を上下方向に移動可能に、且つスライド溝１７の中途位置に形成した下傾動不能部１７ｃおよび上端に形成した上傾動不能部１７ｂにおいて傾動不能とするために、軸部１２ａを断面形状がスライド溝１７の長手方向に沿って上下方向に長い長方形をなす角柱としたが、これに限るものではなく、他の形状例えば、正方形、或いはスライド溝１７の長手方向に長い長円形状としても良い。
【００３８】
さらに、実施例では、蓋本体３と受枠２とを蝶番構造で連結し、反対側に施錠構造４を設けたが、蝶番構造に代えて施錠構造４を設けても良い。
【００３９】
【発明の効果】
本発明の地下構造物用蓋の施錠構造では、スライド溝の中途に設けた傾動部および開蓋操作時に受枠の内面に当接するようにした当接部を有することにより、蓋本体を受枠の外方向に引き上げると、スライド溝に挿通した支持軸が傾動部に取り込まれるとともに、当接部が受枠の内面に当接することによって施錠鉤の傾動による解錠を伴いながら、開蓋の一連の動作で容易に開蓋することができる。また、前記傾動部を除くスライド溝には施錠鉤が支持軸回りに傾動できない傾動不能部を形成したため、地下構造物内の揚圧で蓋本体が浮上したときには、支持軸がスライド溝の上端に位置するので施錠鉤は解錠されることがなく、受枠２に蓋本体をロックして飛散を確実に防止できる。
【００４０】
また、支持軸は、施錠鉤が棚部に載置された状態においてスライド溝の中途に形成した傾動部よりも下方に形成した傾動不能部に位置していることで、閉蓋状態において、施錠鉤の傾動が防止されるため、施錠鉤が施錠可能状態に安定に保持される。
また、スライド溝の下端に第２傾動部を有することにより、閉蓋の際には蓋本体を支持しながら受枠に支持させるのではなく、受枠上端に施錠鉤が直立載置されるように置き、そのまま受枠内側に蓋本体を滑り込ませる（落とし込ませ）ようにするだけで、支持軸を第２傾動部内に取り込んで施錠鉤が傾動するため容易に閉蓋することができるとともに施錠を同時に行うことができる。
【００４１】
また、支持軸の断面形状をスライド溝よりも僅かに幅狭い矩形とすることで、簡単な構造で確実に、且つ容易に施錠鉤を傾動不能に支持することが出来る。
また、施錠鉤の当接部を、スライド溝の中途に形成した傾動部と略同じ高さ位置若しくは僅かに低い位置に形成することで、施錠鉤の支持軸回りの傾動が容易となる。
【００４２】
更に、傾動部をスライド溝の係合爪側の内面を略円弧状に切り欠いた構成としたり、傾動部の内面と当接する支持軸の角部を曲面とすることで、施錠鉤の傾動部における支持軸回りの傾動が滑らかとなり、開蓋時の解錠、閉蓋時の施錠操作が確実に行われる。
【図面の簡単な説明】
【図１】本発明に係る地下構造物用蓋の施錠構造の断面図である。
【図２】図１の施錠構造の受枠に設けられた係止手段の斜視図である。
【図３】図１の施錠構造の蓋本体に設けられた施錠手段の分解斜視図である。
【図４】図３の施錠手段を組み立てた状態の正面図である。
【図５】図４の矢線Ｖ−Ｖに沿う断面図である。
【図６】図１に示す施錠構造の施錠時におけるロック動作を示す説明図である。
【図７】図１に示す施錠構造の開蓋時における解錠動作を示す説明図である。
【図８】図７に示す施錠構造の閉蓋時における施錠動作を示す説明図である。
【符号の説明】
１地下構造物用蓋
２受枠
２ａ嵌合面
３蓋本体
３ａ縁巻
３ｃバール孔
３ｄ袋部
４施錠構造
５係止手段
６施錠手段
７凹部
８棚部
９係止部
１１ブラケット
１１ａ角孔
１２支持軸
１５施錠鉤
１５ａ鉤本体
１５ｂ側部
１５ｃ収納空間
１５ｄ当接部
１６係合爪部
１７スライド溝
１７ｂ上傾動不能部（傾動不能部）
１７ｃ下傾動不能部（傾動不能部）
１８第１傾動部（傾動部）
１９第２傾動部（傾動部）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a locking structure for a lid for an underground structure, and more particularly to a locking structure for a lid for an underground structure that enables locking of a lid body and a receiving frame supporting the lid body.
In this specification, the term “cover for underground structure” refers to a large iron cover, a manhole cover, a sewage basin cover, an electric power Open / close joints for underground facilities, underground cables for water supply and gas pipes, and auxiliary equipment for underground facilities and their auxiliary equipment to protect underground facility equipment and underground cables in communications. A fire hydrant cover, a water control valve cover, a partition valve cover, an air valve cover, a gas pipe cover, a water meter cover, and the like having a function as an opening / closing door.
[0002]
[Prior art]
The lid for various underground structures includes a receiving frame installed at the upper end of the underground structure and opening to the ground such as a road surface, and a lid body that covers the opening by taper fitting or the like to the receiving frame. It is generally mounted on a receiving frame by a structure, so that when the lid is opened, the receiving frame can be turned in a horizontal plane or turned over to the ground side, and further provided with a locking structure for locking the lid body and the receiving frame. is there.
[0003]
As a locking structure for locking the receiving frame and the lid main body, for example, there is one described in Japanese Utility Model Publication No. 63-15391. This locking structure prevents the locking hook having a threaded rod penetrating through the lid body in a lid for an underground structure in which a locking hook that engages with the receiving frame and locks is rotatably supported on the back surface of the lid body. The device is mounted, and the screw is formed with screws at the upper and lower ends of the screw to be screwed to the lid body, and the lower side of the screw is brought into contact with the locking hook when locking, and the locking hook swings by the swing prevention device. The locking state is reliably maintained so that the lid body is not unlocked by turbulent lifting pressure inside the underground structure, and the lid body is prevented from scattering.
[0004]
[Problems to be solved by the invention]
In the above-described locking structure, the swing preventing device reliably prevents the locking hook from swinging to prevent the lid main body from scattering. However, if the lid needs to be opened, first swing the locking hook. After releasing the contact between the movement prevention device and the locking hook, the crowbar of the lid opening jig is inserted into the crowbar hole to press the crowbar pressure receiving portion of the locking hook to unlock, and the biting force between the lid body and the receiving frame. Must be opened to open the cover, and the operation of opening the cover is troublesome. Furthermore, when it is necessary to open the lids for underground structures such as fire hydrant lids, power distribution lids, gas pipe iron lids, etc. in an emergency, it takes time to open the lid and can respond quickly. There is no problem.
[0005]
The present invention has been made in view of the above points, and does not unlock due to turbulent lifting pressure inside an underground structure, and when it is necessary to open the lid, an unlocking operation different from the opening operation is required. It is an object of the present invention to provide a locking structure for a lid for an underground structure, which can be opened without requiring a cover.
[0006]
[Means for Solving the Problems]
The present invention provides a locking structure for a lid for an underground structure, wherein a locking means is provided on the back surface of the lid main body, and a locking frame for supporting the lid main body is provided with locking means for engaging with the locking means. A recess provided on the inner surface of the receiving frame, a locking portion protruding from the upper portion of the recess, and a shelf protruding from the lower portion of the recess to the inside of the receiving frame, wherein the locking means comprises: It consists of a support shaft horizontally fixed facing the recess on a bracket vertically provided on the back surface of the lid body, and a locking hook through which the support shaft is inserted, and the locking hook is inserted through the support shaft. A sliding groove that can be moved up and down in the vertical direction, and an engaging claw that is housed in the concave portion when placed on the shelf, and is engaged with the locking portion and locked when the lid body is lifted by lift or the like. And a position above the support shaft when a locking hook is placed on the shelf in a closed state. A tilting portion formed at least in the middle of a slide groove for taking in the support shaft and tilting the locking hook around the support shaft at the time of opening and closing the lid body, and the tilting portion making the locking hook incapable of tilting around the support shaft. And a non-tiltable portion formed in a slide groove excluding the above, and an abutment portion which is in contact with an inner surface of the receiving frame during the lid opening operation and serves as a tilting fulcrum of the locking hook is provided.
[0007]
With such a configuration, in the closed state, the locking hook does not tilt even by the turbulent lifting pressure inside the underground structure, and when the lid body supported by the receiving frame is pushed up directly, The support shaft moves upward in the slide groove of the locking hook together with the lid body, and contacts the upper end of the sliding groove to lift the locking hook directly upward. Since the locking hook does not tilt when the support shaft is located at a non-tiltable portion except for the tilting portion formed in the slide groove, the engaging claw stored in the concave portion is engaged with the locking portion. As a result, the lid body is locked to the receiving frame and is prevented from scattering.
[0008]
When the lid body is lifted obliquely upward by the lid opening operation, the support shaft moves up in the slide groove of the locking hook and enters the tilting portion, and the contact portion contacts the inner surface of the receiving frame to act as a tilting fulcrum. The lower portion of the locking hook is tilted around the support shaft so as to move toward the center of the receiving frame, and the engaging claw is disengaged from the engaging portion and unlocked. This allows the lid body to be opened.
[0009]
At the time of the lid closing operation, the support shaft is inserted into the tilting portion of the locking hook, the locking hook is tilted around the support shaft, and the engaging claw is lowered so as to contact the inner surface of the receiving frame. Get over the part and lower it. When the lid main body is placed on the receiving frame, the locking hook is placed and supported on the shelf, and the engaging claw is housed in the recess and is opposed to the engaging portion so as to be engageable.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, the tilting portion forms a first tilting portion that takes in the support shaft during the lid opening operation in the middle of the slide groove, and forms a second tilting portion that takes in the support shaft during the lid closing operation at the lower end, In the closed state, the support shaft is located at a non-tiltable portion between the first tilting portion and the second tilting portion. With such a configuration, the locking hook in the closed state is prevented from tilting, and at the time of the closing operation, the locking hook is placed on the upper edge of the receiving frame and the lid body is dropped obliquely downward into the receiving frame. Then, since the support shaft is taken into the second tilting portion and the locking hook is tilted, the locking hook is dropped into the receiving frame and the lid can be easily closed.
[0011]
In the present invention, the support shaft is a rectangle having a sectional shape slightly narrower than the slide groove.
By making the cross section of the support shaft rectangular, it moves up and down along the slide groove of the locking hook, thereby preventing the locking hook from tilting. Preferably, by making the cross-sectional shape of the support shaft a vertically long rectangle along the longitudinal direction of the slide groove, the tilting of the locking hook can be favorably prevented.
[0012]
Further, in the present invention, the abutment portion of the locking hook is formed at substantially the same height position or a slightly lower position as the tilting portion formed in the middle of the slide groove.
By providing the contact portion at such a position, when the cover comes into contact with the inner surface of the receiving frame and acts as a tilting fulcrum of the locking hook, the locking hook can be easily tilted. Further, in the present invention, the tilting portion has a configuration in which the inner surface of the slide groove on the engaging claw side is cut out in a substantially circular arc shape, or a corner portion of the support shaft that contacts the inner surface of the tilting portion is a curved surface. With this configuration, the locking hook can be easily tilted about the support axis during the opening and closing operations.
[0013]
In addition, the inner surface of the tilting portion is formed in a substantially arc shape, and the corner portion of the support shaft abutting on the inner surface is formed as a curved surface, so that both can smoothly slide, and the locking hook can be more easily tilted about the support shaft. It becomes.
(Example)
FIG. 1 is a sectional view of a locking structure of a lid for an underground structure according to the present invention. In FIG. 1, the lid 1 for an underground structure has a circular shape in a plan view constituted by a receiving frame 2 and a lid main body 3, and an upper surface thereof is installed flush with a ground surface (GL). The receiving frame 2 forms a fitting surface 2a with a lid main body 3 having an inner peripheral upper surface tapered, and the lid main body 3 reduces the outer peripheral surface of the rim winding 3a to a tapered shape to form a fitting surface 2a. Abutted. The lid body 3 is connected to the receiving frame 2 so as to be openable and closable by a hinge structure (not shown). The cover can be opened. A locking structure 4 is provided between the receiving frame 2 and the lid main body 3. The locking structure 4 includes a locking means 5 provided on the receiving frame 2 at a position opposite to the hinge structure and a locking means 6 provided on the lid main body 3. Is provided.
[0014]
The above-described hinge structure is, for example, an underground structure having a structure in which an annular hinge seat is provided protruding from the inner periphery of the receiving frame 2 and a hinge hardware swingably attached to the back surface of the lid body 3 is inserted therein. Well-known lids can be used. This hinge structure has a certain degree of freedom in the front-rear direction with respect to the hinge seat in a state where the hinge hardware is inserted into the hinge seat.In the present embodiment, by providing such a hinge structure, At the time of opening the lid, the lid main body 3 can be pulled up obliquely upward to the front side. Further, the lid body 3 is pushed straight up by the length of the hinge structure when subjected to turbulent lifting pressure inside the underground structure.
[0015]
As shown in FIG. 2, the receiving frame 2 has a fitting surface 2a for fitting and supporting the lid body 3 on an inner peripheral upper surface thereof, and a slightly smaller diameter than the fitting surface 2a at a lower portion via a step 2c. Of the inner peripheral surface 2b. The locking means 5 includes a concave portion 7 formed on the inner peripheral surface 2 b, a shelf 8 projecting substantially inward from the lower end of the concave portion 7 toward the inside of the receiving frame 2, A locking portion 9 is provided at the upper end of the opening along the circumferential direction. The shelf 8 has a length that does not hinder the worker from entering or leaving the receiving frame 2.
[0016]
As shown in FIG. 3, the lid body 3 is provided with a burr hole 3c which bulges downward in a bag-like shape at a position corresponding to the locking means 5 of the receiving frame 2 at a peripheral edge of the upper surface 3b. A pair of brackets 11, 11 are vertically provided on the back surface of the lid main body 3 at the left and right sides of the bag portion 3d forming the burl hole 3c and slightly inside the rim winding 3a. As shown in FIG. 1, in a closed state in which the lid main body 3 is fitted and supported in the receiving frame 2, these brackets 11 are spaced apart from the concave portion 7, and the lower ends thereof are slightly separated from the shelf 8. A polygonal, for example, rectangular square hole 11a whose height is slightly longer than its width is formed in the lower part of each bracket 11 so as to face each other.
[0017]
A support shaft 12 which is inserted into a slide groove 17 of a locking hook 15 described later is provided horizontally in the square hole 11a. The support shaft 12 forms a rectangular prism having a rectangular cross section that fits and penetrates into the square hole 11a of the bracket 11, and forms a shaft portion 12a that is set to the same length as the outer dimensions of the brackets 11, 11. A head 12b is formed at one end, and a screw portion 12c is formed at the other end. A corner formed by the upper surface of the shaft portion 12a and the outer surface facing the outside of the lid body 3 is chamfered over the entire length to form a curved surface 12d.
[0018]
The locking hook 15 can be stored between the brackets 11 on both sides, and the side portions 15b, 15b are raised on both upper sides of the hook body 15a, and a storage space 15c is provided in the middle. The storage space 15c stores a bag portion 3d that forms a burl hole 3c that is a bag hole when the lid body 3 is closed as described later. The width of the locking hook 15 is set to be slightly shorter than the opening width of the concave portion 7, the substantially L-shaped engaging claw portion 16 protrudes forward at the lower portion of the front surface, and the locking portion 9 is provided in the concave portion 7. It can be stored facing.
[0019]
The locking hook 15 is provided with a vertically extending slide groove 17 in the hook body 15a and the side portions 15b, 15b rising upward. The slide groove 17 is slightly wider than the width of the vertical cross-sectional shape of the support shaft 12, and the support shaft 12 can move up and down with a slight gap. On the inner surface 17a of the slide groove 17 on the locking claw portion 16 side (front side), a first tilting portion 18 is cut out at an upper portion and a second tilting portion 19 is cut at a lower end in a substantially arc shape. The first tilting portion 18 can take in the support shaft 12 when the lid is opened, and the second tilting portion 19 can tilt the locking hook 15 around the support shaft 12 when the lid is closed. That is, as shown in FIG. 5, the first tilting portion 18 has an arc-shaped upper surface 18a at an upper portion and an inclined surface 18b at a lower portion. Further, the second tilting portion 19 has a fan shape in which the upper surface 19a has an arc shape.
[0020]
Further, an upper non-tiltable portion 17b is formed at the upper end of the slide groove 17, and a lower non-tiltable portion 17c is formed between the first tiltable portion 18 and the second tiltable portion 19 of the slide groove 17, and the upper and lower tiltable portions are formed. When the support shaft 12 is located at the impossible portions 17b and 17c, the locking hook 15 is prevented from tilting around the support shaft 12.
At upper front portions of both side portions 15b, 15b of the locking hook 15, contact portions 15d, 15d are formed to bulge forward at a height position substantially corresponding to the first tilting portion 18. These contact portions 15d, 15d are formed such that the support shaft 12 is taken into the first tilting portion 18 of the locking hook 15 during the opening operation, and the locking portion 9 formed at the upper end of the opening of the concave portion 7 formed in the receiving frame 2 and The locking hook 15 is a tilting fulcrum when the locking hook 15 tilts around the support shaft 12 by successively abutting and sliding on the fitting surface 2a.
[0021]
As shown in FIGS. 1, 3 and 4, the locking hook 15 is disposed between the brackets 11, 11 such that the locking claw 16 is housed in the recess 7, and the shaft 12 a of the support shaft 12 is provided. Is inserted through the square hole 11a of the bracket 11 on one side, the slide groove 17 of the locking hook 15, and the square hole 11a of the bracket 11 on the other side, and the nut 14 is screwed into the screw portion 12c via the washer 13, so that the head It is fixed by the part 12b and the nut 14.
[0022]
Further, as shown in FIG. 5, the support shaft 12 can enter the second tilting portion 19 at a position abutting on the lower end surface of the slide groove 17 as shown by a two-dot chain line 12 ′. The shaft 12 can enter the first tilting portion 18 along the inclined surface 18b at the lower end position of the first tilting portion 18. The locking hook 15 can be tilted (rotated) with respect to the support shaft 12 when the support shaft 12 enters the first tilt portion 18 or the second tilt portion 19, and is shown at other positions, that is, indicated by solid lines. When the support shaft 12 is located at the lower tiltable portion 17c formed substantially in the middle of the slide groove 17, as shown by the two-dot chain line 12 ", the upper tiltable portion 17b formed at the upper end of the slide groove 17 is formed. When it is located at, it cannot be tilted.
[0023]
As shown in FIG. 1, the locking structure 4 of the lid 1 for an underground structure has a structure in which the locking hook 15 hangs down by its own weight when the lid body 3 is supported and fitted in the receiving frame 2 and the lid is closed. , And the engaging claw portion 16 enters the concave portion 7 and is located below the locking portion 9 so as to be able to engage with the locking portion 9. Further, the contact portion 15 d of the locking hook 15 slightly contacts the end face of the locking portion 9. The contact portion 15d does not need to be in contact with the end face of the locking portion 9, and may be slightly separated. In such a closed state, the support shaft 12 is located in the downwardly tiltable portion 17 c so as to have a gap between the support shaft 12 and the lower end of the slide groove 17 formed in the locking hook 15. A gap between the support shaft 12 and the lower end of the slide groove 17 is larger than the gap between the support shaft 12 and the lower end of the slide groove 17.
[0024]
Next, the operation of the locking structure 4 will be described with reference to FIGS.
First, the locking operation of the locking structure 4 when the turbulent lift generated inside the underground structure acts on the lid body 3 to push it up will be described with reference to FIGS. FIG. 6A shows a state in which the lid main body 3 is fitted and supported on the receiving frame 2. The locking hook 15 is placed on the shelf 8 by its own weight, the engaging claw 16 enters the recess 7, and faces the locking portion 9 below the locking portion 9. In this state, the lower surface of the support shaft 12 is located slightly above the lower end surface of the slide groove 17 of the locking hook 8, and the upper portion of the support shaft 12 is located at the downwardly tiltable portion 17 c. The tilt of the hook 15 is prevented.
[0025]
In this state, when turbulent lifting pressure acts on the back surface of the lid body 3, the locking hook 15 is not only less likely to be lifted by the shelf portion 8, but also the support shaft 12 is located at the downwardly tiltable portion 17 c. Therefore, when the lid body 3 is pushed up just above as shown by the arrow A in the figure (b) and floats up in the immobile state, the support shaft 12 moves in the slide groove 17 accordingly. When the lid body 3 is further pushed up and lifted off the receiving frame 2 as shown in FIG. 3 (c), the support shaft 12 comes into contact with the upwardly tiltable portion 17b formed at the upper end of the slide groove 17.
[0026]
When the lid main body 3 is further pushed up, the support shaft 12 pulls the locking hook 15 right above as shown in FIGS. At this time, the locking hook 15 is pulled up while maintaining the substantially upright state while preventing the tilting because the support shaft 12 is located in the upward tilting impossible portion 17b. Move up. Then, when the engaging claw 16 of the locking hook 15 engages with the locking portion 9 as shown in FIG. 5 (f), the locking hook 15 is locked to prevent the lid body 3 from floating, and the underground structure The scattering of the lid body 3 due to the internal turbulent lifting pressure is prevented.
[0027]
Next, the unlocking operation of the locking structure 4 when the lid main body 3 is opened will be described with reference to FIGS.
In FIG. 1, the worker inserts the tip of a dedicated bar (not shown) into the burl hole 3 c of the lid body 3 to release the bite between the receiving frame 2 and the lid body 3, and the arrow B in FIG. When the lid body 3 is pulled up diagonally upward while being pulled toward the near side as described above, the support shaft 12 moves inside the slide groove 17 of the locking hook 15 as the lid body 3 is pulled up diagonally upward. It moves upward while sliding on 17 a, and slides on the inclined surface 18 b of the first tilting portion 18 to enter into the first tilting portion 18. On the other hand, the locking hook 15 is still mounted on the shelf 8, the engaging claw 16 is opposed to the locking portion 9, and the contact portion 15d is in contact with the end face of the locking portion 9.
[0028]
When the lid body 3 is further pulled up obliquely upward, the arc-shaped upper surface 18a formed on the first tilting portion 18 slides on the curved surface 12d formed on the support shaft 12 to support as shown in FIG. The shaft 12 starts lifting the locking hook 15. At this time, the locking hook 15 receives the force of turning in the counterclockwise direction in the drawing with the first tilting portion 18 as the point of force and the contact surface 15d contacting the end surface of the locking portion 9 as the tilting fulcrum, and the front lower end edge Tilts rearward (counterclockwise) while sliding on the shelf 8. When the lid main body 3 is further pulled up obliquely upward, the locking hook 15 further tilts as shown in FIG. 4C, and the engaging claw 16 comes out of the concave portion 7 to disable the engagement with the locking portion 9. Is done. At this time, the front upper edge of the locking hook 15 abuts on the fitting surface 2a, and the tilting of the locking hook 15 is stably held.
[0029]
With the locking hook 15, as the lid body 3 is pulled up obliquely upward, as shown in (d), the abutting portion 15 d abuts on the fitting surface 2 a from the end surface of the locking portion 9, and the fitting surface 2 a It is pulled up while maintaining the tilting state while sliding. Then, the engagement claw portion 16 passes through the inside of the locking portion 9 (inward of the receiving frame 2) with a slight gap from the locking portion 9.
[0030]
When the lid main body 3 is further pulled obliquely upward and the contact portion 15d of the locking hook 15 is disengaged from the fitting surface 2a of the receiving frame 2 as shown in FIG. It is pulled up while abutting, and is placed on the upper end of the receiving frame 2 as shown in FIG. Thereafter, the lid body 3 is opened by horizontal turning or inversion by a normal opening operation.
[0031]
The burl hole 3c of the lid body 3 is formed in a bag shape, so that the locking hook 15 cannot be directly operated with a burl at the time of opening the lid. Unless the lid operation is performed, the locking structure 4 cannot be unlocked and the lid cannot be opened. That is, even if a person who is not a person skilled in the art, such as a maintenance manager of the underground structure, tries to lift the lid main body 3 directly above, the lid is locked and cannot be opened as shown in FIG. However, those skilled in the art, when it is necessary to open the lid, perform a series of opening operations as described above, that is, open and release easily without requiring an unlocking operation separate from the opening operation. You can cover it.
[0032]
Next, the locking operation of the locking structure 4 when closing the lid will be described with reference to FIGS.
When closing the lid body 3, first, the operator lifts the lid body 3 and places the locking hook 15 upright on the upper end of the receiving frame 2 as shown in FIG. In this state, the upper end surface of the locking hook 15 is slightly separated from the back surface of the lid main body 3, and the support shaft 12 is disengaged from the downwardly tiltable portion 17 c and the lower surface contacts the lower end surface of the sliding groove 17 of the locking hook 15. The locking hook 15 can be tilted by being able to enter the second tilting portion 19.
[0033]
Next, the operator drops the lid body 3 obliquely downward into the receiving frame 2 as shown by the arrow C in FIG. The locking hook 15 slides on the upper end surface of the receiving frame 2 as the lid main body 3 is pressed, and when the lower surface comes off the upper end surface as shown in FIG. The lower end edge is tilted clockwise (rearward) in the drawing with the tilting fulcrum as the tilting fulcrum. As the lid body 3 is dropped obliquely downward (c) and (d), the locking hook 15 descends while the engaging claw 16 slides on the fitting surface 2a of the receiving frame 2 as shown in FIGS. e) The rear lower edge of the locking hook 15 contacts the shelf 8 as shown in the figure.
[0034]
Then, as shown in (f), when the lid body 3 is fitted into the receiving frame 2 and the lid is closed, the locking hook 15 has a shape in which the engaging claw portion 16 opens upward in a substantially L-shape. As a result, it easily gets over without engaging with the locking portion 9, rotates in the counterclockwise direction (front side) in the drawing, and the lower surface thereof comes into contact with the shelf 8 and is supported vertically. Then, the engaging claw portion 16 of the locking hook 15 is housed in the concave portion 7, is positioned below the locking portion 9, and is locked so as to be engageable with the locking portion 9. In this manner, the worker does not fit the receiving frame 2 while supporting the lid body 3 at the time of closing the lid, but instead places the locking hook 15 on the upper end of the receiving frame 2 in an upright state. Can be locked at the same time by a series of operations of closing the lid so as to slide it into the receiving frame 2 (drop it obliquely downward).
[0035]
In addition, although the 2nd tilting part 19 was provided in the lower end of the slide groove 17 of the locking hook 15 as a tilting part so that a lid closing operation becomes easy, only the first tilting part 18 may be used as a tilting part. In this case, the lid closing operation is performed by slightly lifting the lid main body 3 from the state where the locking hook 15 is placed on the upper end of the receiving frame 2 to position the support shaft 12 on the first tilting portion 18 and tilting the locking hook 15 by hand. Then, the locking hook 15 is slid on the inner peripheral surface 2a of the receiving frame to close the lid.
[0036]
In the above-described embodiment, the burl hole 3c of the lid body 3 is a bag-shaped burr hole, but is not limited to this, and may be an open burl hole that has been conventionally generally used. However, a bag-shaped burl hole as in the embodiment is preferable in that it can prevent the lid from being opened by a third party other than those skilled in the art and can prevent intrusion of rainwater and the like.
[0037]
Further, in the above embodiment, the support shaft 12 is capable of moving the locking hook 15 in the vertical direction, and is tilted at the lower tiltable portion 17c formed at an intermediate position of the slide groove 17 and the upper tiltable portion 17b formed at the upper end. In order to make it impossible, the shaft portion 12a is a prism having a rectangular shape whose cross-sectional shape is vertically long along the longitudinal direction of the slide groove 17, but is not limited thereto. The groove 17 may have an oval shape that is long in the longitudinal direction.
[0038]
Further, in the embodiment, the lid body 3 and the receiving frame 2 are connected by a hinge structure, and the locking structure 4 is provided on the opposite side. However, the locking structure 4 may be provided instead of the hinge structure.
[0039]
【The invention's effect】
In the locking structure of the lid for an underground structure according to the present invention, the lid body is provided outside the receiving frame by having the tilting portion provided in the middle of the slide groove and the abutting portion which comes into contact with the inner surface of the receiving frame during the opening operation. When it is lifted in the direction, the support shaft inserted in the slide groove is taken into the tilting part, and the contact part comes into contact with the inner surface of the receiving frame, unlocking by tilting the locking hook, and performing a series of operations of opening the lid. The lid can be easily opened. In addition, since the locking hook has a non-tiltable portion that cannot tilt around the support shaft in the slide groove except for the tilting portion, when the lid body floats due to the lifting pressure in the underground structure, the support shaft is at the upper end of the slide groove. Since it is located, the locking hook is not unlocked, and the cover main body is locked to the receiving frame 2 so that scattering can be reliably prevented.
[0040]
Further, the support shaft is located at a non-tilt portion formed below the tilt portion formed in the middle of the slide groove in a state where the locking hook is placed on the shelf, so that the locking shaft is locked in the closed state. Since the hook is prevented from tilting, the locking hook is stably held in a lockable state.
In addition, by having the second tilting portion at the lower end of the slide groove, the lid is not supported by the receiving frame while supporting the lid body when the lid is closed, but the locking hook is placed upright on the upper end of the receiving frame. By simply sliding (dropping) the lid body inside the receiving frame as it is, the support shaft is taken into the second tilting portion, and the locking hook is tilted, so that the lid can be easily closed and locked simultaneously. be able to.
[0041]
Further, by making the cross-sectional shape of the support shaft a rectangle slightly narrower than the slide groove, it is possible to securely and easily support the locking hook with a simple structure so as not to tilt.
Further, by forming the abutting portion of the locking hook at substantially the same height position or a slightly lower position as the tilting portion formed in the middle of the slide groove, the locking hook can be easily tilted around the support axis.
[0042]
Further, the tilting portion may have a configuration in which the inner surface of the slide groove on the engaging claw side is cut out in a substantially arc shape, or the corner portion of the support shaft that contacts the inner surface of the tilting portion may have a curved surface, so that the tilting portion of the locking hook is , The tilting around the support shaft becomes smooth, and the unlocking operation at the time of opening the lid and the locking operation at the time of closing the lid are reliably performed.
[Brief description of the drawings]
FIG. 1 is a sectional view of a locking structure of a lid for an underground structure according to the present invention.
2 is a perspective view of locking means provided on a receiving frame of the locking structure of FIG.
FIG. 3 is an exploded perspective view of a locking means provided on a lid main body of the locking structure of FIG. 1;
FIG. 4 is a front view of a state where the locking means of FIG. 3 is assembled.
FIG. 5 is a sectional view taken along the line VV in FIG. 4;
FIG. 6 is an explanatory view showing a locking operation when the locking structure shown in FIG. 1 is locked.
FIG. 7 is an explanatory view showing an unlocking operation when the locking structure shown in FIG. 1 is opened.
FIG. 8 is an explanatory view showing a locking operation when the locking structure shown in FIG. 7 is closed.
[Explanation of symbols]
1 Underground structure lid
2 Receipts
2a mating surface
3 Lid body
3a
3c burl hole
3d bag
4 Locking structure
5 Locking means
6 Locking means
7 recess
8 shelves
9 Locking part
11 Bracket
11a Square hole
12 Support shaft
15 Locking hook
15a Hook body
15b side
15c storage space
15d contact part
16 Engagement claw
17 Slide groove
17b Non-tiltable upper part (non-tiltable part)
17c Non-tiltable part (non-tiltable part)
18 First tilting part (tilting part)
19 Second tilting part (tilting part)

Claims

In a locking structure for a lid for an underground structure, a locking means is provided on a back surface of the lid main body, and a receiving frame supporting the lid main body is provided with locking means for engaging with the locking means.
The locking means,
A concave portion provided on the inner surface of the receiving frame, a locking portion protruding from an upper portion of the concave portion, and a shelf portion protruding inward from the lower portion of the concave portion into the receiving frame;
The locking means,
It consists of a support shaft horizontally fixed facing the recess on a bracket vertically provided on the back surface of the lid body, and a locking hook through which the support shaft is inserted,
The locking hook is
A slide groove through which the support shaft is inserted and which can move in the vertical direction, and is accommodated in the concave portion when placed on the shelf portion, and is engaged with the locking portion when the lid body is raised by lift or the like. An engaging claw to be locked, and a locking hook positioned above the support shaft when the locking hook is placed on the shelf in a closed state, and the locking hook is taken in by opening and closing the lid body when the lid body is opened and closed. A tilting portion formed at least in the middle of a slide groove for tilting the lock around the support axis, a non-tiltable portion formed in a slide groove excluding the tiltable portion for locking the locking hook about the support shaft, and the lid opening operation A lock portion for an underground structure lid, wherein an abutment portion is provided which sometimes comes into contact with an inner surface of the receiving frame and serves as a tilting fulcrum of the locking hook.

The tilting portion forms a first tilting portion that can take in the support shaft in the middle of the slide groove at the time of the lid opening operation and can tilt the locking hook around the support shaft, and at the lower end of the slide groove at the time of the lid closing operation. A second tilting portion is formed to receive the support shaft and tilt the locking hook around the support shaft, and when the cover is in a closed state, the support shaft cannot tilt between the first tilt portion and the second tilt portion. The underground structure lid locking structure according to claim 1, wherein the locking structure is located at a part.

The locking structure for a lid for an underground structure according to claim 1, wherein the support shaft has a rectangular shape having a cross section slightly narrower than the slide groove.

The underground structure according to any one of claims 1 to 3, wherein the abutting portion of the locking hook is formed at a position substantially equal to or slightly lower than the tilting portion formed in the middle of the slide groove. Locking structure for the lid.

5. The underground structure lid locking structure according to claim 1, wherein the tilting portion is formed by cutting out an inner surface of the slide groove on the side of the engaging claw in a substantially arc shape. 6.

The locking structure of a lid for an underground structure according to any one of claims 1 to 5, wherein the support shaft has a curved portion at a corner portion that contacts the inner surface of the tilting portion.