JP3750944B2

JP3750944B2 - Locking device for lids such as manholes

Info

Publication number: JP3750944B2
Application number: JP2003146780A
Authority: JP
Inventors: 輝長大河内
Original assignee: Takigen Manufacturing Co Ltd
Current assignee: Takigen Manufacturing Co Ltd
Priority date: 2003-05-23
Filing date: 2003-05-23
Publication date: 2006-03-01
Anticipated expiration: 2023-05-23
Also published as: JP2004346662A

Description

【０００１】
【発明が属する技術分野】
本発明は、通信ケ−ブルや送電ケ−ブル、上下水道管を収納する共同溝の出入り用マンホール等に装備される蓋用ロック装置に関するものである。
【０００２】
【従来の技術】
マンホール等の蓋を閉鎖位置において固定受枠に対し開放不能に施錠する従来のロック装置では、錠前ユニットの鍵孔が路上に露出しているため、泥等のに異物が目詰まりして回転しなくなる恐れがある。
【０００３】
また、施錠状態と解錠状態の判別が容易でないため、蓋を閉めた後に施錠し忘れる可能性があり、正当権限者以外の者が共同溝に侵入することがある。
【０００４】
他の蓋用ロック装置としては、前記蓋を上下方向に貫通する外筒と、該外筒に回転可能に収容された施錠軸と、該施錠軸の下端部に固着され、固定受枠側の受金部と係合する止め金板とからなり、操作用鍵には、前記施錠軸の上端部に形成した鍵受け凹部に挿入される鍵コード部を先端部に形成したものがある（例えば、特許文献１参照）。
【０００５】
この蓋用ロック装置では、泥水の侵入によって施錠軸の鍵受部が目詰まりして鍵の差し込みが困難または不可能とならないようにするため、該鍵受部の形状を例えば略三角形状などの単純化した形状に形成している。
このような特殊な使用環境を考慮に入れた設計であるため、錠機能としてのセキュリティーにおいて劣る点があり、本来の鍵以外の用具を無理矢理に差し込むことによって施錠軸を回すことも不可能ではなかった。
【０００６】
【特許文献１】
特許第３２９１２６９号公報
【０００７】
【発明が解決しようとする課題】
したがって本発明の目的は、雨水や泥水に曝される劣悪な使用環境に耐えるとともに、必要充分なセキュリティー機能を有するマンホール蓋用施錠装置を提供することである。
【０００８】
【課題を解決するための手段】
以下、添付図面中の参照符号を用いて説明すると、本発明の特徴は、マンホール等の蓋１に縦長に固着され、上半部内周面に雌螺子部３が形成された筒状ケース２と、筒状ケース２の下半部に上下動および回転可能に挿入され、頭部周面にＬ字状のカム溝５が形成されたロックシャフト４と、ロックシャフト４の下部に連結され、マンホール等の固定受枠６側のストライク７と係脱するロック板８と、筒状ケース２の下半部内面に固設され、ロックシャフト４が回転させられるとき、カム溝５との協働によってロックシャフト４を上下動させるガイドピン１０と、ロックシャフト４の上方において筒状ケース２に抜差し可能に嵌め込まれる錠前ユニット１２と、相交差する２本の操作軸１４，１５を備えており、ロックシャフト４の頭部上面の回転受動部９に嵌合される回転駆動部１６が一方の操作軸１４の先端部に形成され、錠前ユニット１２の施錠軸１８に嵌合される施錠駆動部１７が他方の操作軸１５の先端部に形成されたキーハンドル１３とからなり、施錠駆動部１７の使用によって錠前ユニット１２を筒状ケース２から抜き取った後、キーハンドル１３の回転駆動部１６によってロックシャフト４を回転させて固定受枠６に対する蓋１の固定を解除し、筒状ケース２の雌螺子部３に蓋吊上げ用アイボルト１１を捻じ込むようにしたマンホール等の蓋用ロック装置において、
前記錠前ユニット１２は、筒状ケース２に挿入される外筒１９と、外筒１９に回転不能かつ上下方向に移動可能に収容され、施錠軸１８が嵌挿される非円形状の受孔２１を中央部に形成した錠止板２０と、錠止板２０を上昇方向に付勢するバネ部材２２と、外筒１９の下部空間に収容され、施錠軸１８の下部が挿入される軸孔２４を中央部に形成したサポート体２３と、軸孔２４と交差するサポート体２３の側面孔２５に嵌挿され、連動カム機構を介して施錠軸１８に接続され、施錠軸１８の回転に対応して筒状ケース２の下部内側面の係止突起２６に係合可能な位置に出没するロック体２７と、外筒１９の上部内側面に突設され、筒状本体１９に対するキーハンドル１３の抜差しを規制する抜差し規制体２８とからなり、施錠軸１８の上部には、錠止板２０の受孔２１に係合したとき、施錠軸１８を回転不能にする断面非円形状の回転制止部２９と、施錠軸１８を回転可能にする回転許容部３０を上下に形成してあり、キーハンドル１３の施錠駆動部１７は施錠軸１８の回転制止部２９に合致した凹部形状に形成してあり、施錠駆動部１７に隣接したキーハンドル１３の操作軸１５の外周面には、抜差し規制体２８の規制突起３１に当接する環状突起３２を形成してあり、環状突起３２には規制突起３１が通過可能な逃げ溝３３を形成してあり、ロック体２７が筒状ケース２の係止鍔部２６と非係合の位置までキーハンドル１３の操作軸１５を回転させたとき、規制突起３１が環状突起３２の下面に係合して、キーハンドル１３を抜取り不能にしたものである。
【０００９】
【発明の作用】
請求項１の発明では、通信ケーブルの補修交換や点検等の作業のためにマンホールの正当管理者からキーハンドル１３を渡された作業員は、筒状ケース２の上面開口からキーハンドル１３の片側の操作軸１５を錠前ユニット１２に挿入し、操作軸１５の施錠駆動部１７を施錠軸１８に嵌合させる。キーハンドル１３で施錠軸１８を解錠方向に回転させ、蓋１に対する錠前ユニット１２の錠止を解除した後、図２に示したように錠前ユニット１２を筒状ケース２から抜き取る。
【００１０】
次に図３に示したようにキーハンドル１３の別の操作軸１４を筒状ケース２の上面開口から挿入し、回転駆動部１６をロックシャフト４の回転受動部９に嵌合させ、ロックシャフト４をキーハンドル１３と一体に所定方向に所要角度回す。
このとき、ガイドピン１０が見掛け上、Ｌ字状のカム溝５の水平部分５ａから屈折交差部５ｂに当たるまでの最初の過程では、ロック板８は水平方向に回転して固定受枠６側のストライク７の下面側から離脱する。これによって固定受枠６０に対する蓋１の係止施錠が解除される。次に、ガイドピン１０が見掛け上、屈折交差部５ｂから垂直部分５ｃに入り込む次の過程では、図４に示したようにロック板８はロックシャフト４と一体に筒状ケース２に沿って上方移動する。
【００１１】
この後、図４に示したようにアイボルト１１を筒状ケース２の雌螺子部３に捻じ込み、クレーン等の用重機より繰り出した吊下げ部材の末端部がアイボルト１１に連結され、蓋１が吊上げ開放される。作業員は全面開放されたマンホールから共同溝等に入り込み、所定の作業に着手する。
作業の終了後、作業員はマンホールから路上に出る。前記重機の使用によって蓋１を固定受枠６の所定の閉鎖位置に吊り下した後、筒状ケース２からアイボルト１１を取外す。
【００１２】
キーハンドル１３の操作軸１４を筒状ケース２の上面開口から挿入し、操作軸１４の回転駆動部１６をロックシャフト４の回転受動部９に嵌合させて、ロックシャフト４をキーハンドル１３と一体に前記とは逆方向に回転させる。見掛け上、ガイドピン１０がＬ字状カム溝５の垂直部分５ｃから屈折交差部５ｂに戻る過程において、ロックシャフト４とロック板８は一体に下方移動し、屈折交差部５ｂから水平部分５ａに戻る過程において、ロック板８は水平方向に回転してストライク７の下面側に入り込む。これによって固定受枠６０に対する蓋１の係止施錠が成立する。
【００１３】
次に、キーハンドル１３の操作軸１４を筒状ケース２から引出した後、筒状ケース２の上面開口から錠前ユニット１２を嵌め落す。その後、筒状ケース２の上面開口からキーハンドル１３の別の操作軸１５を挿入し、操作軸１５の施錠駆動部１７を錠前ユニット１２の施錠軸１８に嵌合させる。キーハンドル１３で施錠軸１８を施錠方向に回転させ、筒状ケース２に対して錠前ユニット１２を抜き取り不能に係止施錠する。
その後、キーハンドル１３の操作軸１５を筒状ケース２から抜き取り、筒状ケース２の上面開口を適当なキャップ盤３４で閉塞した後、作業員は現場を立ち去る。
【００１４】
また、蓋１の閉鎖施錠状態においては、錠止板２０の受孔２１には施錠軸１８の回転制止部２９が係合しており、施錠軸１８は錠止板２０を介して外筒１９に対して回転不能に拘束されている。そのため、施錠軸１８に連動装備されているロック体２７は、先端部が筒状ケース２の係止突起２６に係合可能な施錠位置に保持されている。
【００１５】
図１５に示したようにキーハンドル１３の片側の操作軸１５を錠前ユニット１２に挿入し、操作軸１５の環状突起３２の逃げ溝３３を抜差し規制体２８の規制突起３１と位置合わせをした後、キーハンドル１３を押し下げると、操作軸１５の施錠駆動部１７の先端面が錠止板２０に当接する。さらにキーハンドル１３を押し下げると、錠止板２０がバネ部材２２の付勢に抗して下方移動し、図１６に示したように施錠駆動部１７が施錠軸１８の回転制止部２９に嵌合する一方、錠止板２０の受孔２１に施錠軸１８の回転許容部３０が係合する。そのため、錠止板２０を介して成立していた外筒１９に対する施錠軸１８の回転拘束が解除される。
【００１６】
この段階でキーハンドル１３の操作軸１５を解錠方向に回すと、施錠軸１８がサポート体２３の軸孔２４を中心として操作軸１５と一体的に回転し、ロック体２７が連動カム機構の作用によって没入方向に摺動し、筒状ケース２の係止突起２６の下面側位置から離脱するため、筒状ケース２に対する錠前ユニット１２の拘束が解除される。この状態では、抜差し規制体２８の規制突起３１が操作軸１５の環状突起３２の下面側に係合しているため、図２に示したように錠前ユニット１２は操作軸１５を引き上げることによって、筒状ケース２から抜き取られる。
【００１７】
次に図３に示したようにキーハンドル１３の別の操作軸１４を筒状ケース２に挿入し、操作軸１４の回転駆動部１６をロックシャフト４の回転受動部９に嵌合させて、ロックシャフト４をキーハンドル１３と一体に所定方向に所要角度回す。
このとき、ガイドピン１０が見掛け上、Ｌ字状のカム溝５の水平部分５ａから屈折交差部５ｂに当たるまでの最初の過程では、ロック板８は水平方向に回転して固定受枠６側のストライク７の下面側から離脱する。これによって固定受枠６０に対する蓋１の係止施錠が解除される。次に、ガイドピン１０が見掛け上、屈折交差部５ｂから垂直部分５ｃに入り込む次の過程では、図４に示したようにロック板８はロックシャフト４と一体に筒状ケース２に沿って上方移動する。
【００１８】
この後、図４に示したようにアイボルト１１を筒状ケース２の雌螺子部３に捻じ込み、クレーン等の用重機より繰り出した吊下げ部材の末端部がアイボルト１１に連結され、蓋１が吊上げ開放される。作業員は全面開放されたマンホールから共同溝に入り込む。
作業の終了後、前記重機の使用によって蓋１を所定の閉鎖位置に吊り下した後、筒状ケース２からアイボルト１１を取外す。
【００１９】
キーハンドル１３の操作軸１４を筒状ケース２に挿入し、操作軸１４の回転駆動部１６をロックシャフト４の回転受動部９に嵌合させて、ロックシャフト４をキーハンドル１３と一体に前記とは逆方向に回転させる。見掛け上、ガイドピン１０がＬ字状カム溝５の垂直部分５ｃから屈折交差部５ｂに戻る過程において、ロックシャフト４とロック板８は一体に下方移動し、屈折交差部５ｂから水平部分５ａに戻る過程において、ロック板８は水平方向に回転してストライク７の下面側に入り込む。これによって固定受枠６０に対する蓋１の係止施錠が成立する。
【００２０】
次に、キーハンドル１３の操作軸１４を筒状ケース２から引出した後、筒状ケース２の上面開口から錠前ユニット１２を嵌め落とし、ロックシャフト４の上方空間を錠前ユニット１２で閉塞する。その後、キーハンドル１３の片側の操作軸１５を錠前ユニット１２に挿入し、操作軸１５の環状突起３２の逃げ溝３３を抜差し規制体２８の規制突起３１と位置合わせしてから、キーハンドル１３を押し下げると、操作軸１５の施錠駆動部１７の先端面が錠止板２０に当接する。さらにキーハンドル１３を押し下げると、錠止板２０がバネ部材２２の付勢に抗して下方移動し、施錠駆動部１７が施錠軸１８の回転制止部２９に嵌合する一方、錠止板２０の受孔２１に施錠軸１８の回転許容部３０が係合する。そのため、外筒１９に対する施錠軸１８の回転拘束が解除される。
【００２１】
この段階でキーハンドル１３の操作軸１５を施錠方向に回すと、施錠軸１８がサポート体２３の軸孔２４を中心として回転し、ロック体２７が連動カム機構の作用によって突出方向に摺動し、ロック体２７の先端部が筒状ケース２の係止突起２６の下面側の位置に来る。これによって筒状ケース２に対して錠前ユニット１２が抜取り不能に錠止される。
このように錠前ユニット１２が抜き取り不能に錠止された状態においては、操作軸１５の環状突起３２の逃げ溝３３が抜差し規制体２８の規制突起３１に対面した位置に来ているため、操作軸１５を手前に引くことによって、キーハンドル１３が錠前ユニット１２から抜き取られる。その後、キーハンドル１３の操作軸１５を筒状ケース２から抜き取り、筒状ケース２の上面開口を適当なキャップ盤３４で閉塞した後、作業員は現場を立ち去る。
【００２２】
【発明の実施の形態】
図示した実施例では、カム溝５は上側の水平部分５ａの末端部から屈折交差部５ｂまでの部分が螺旋状に傾斜して形成され、屈折交差部５ｂの末端部から垂直部分５ｃが軸方向に真っ直ぐに形成されている。
錠前ユニット１２のロック体２７の先端部が係合する係止突起２６は、筒状ケースの中間部内面に内向き鍔状に連続形成されている。筒状ケース２の雌螺子部３は該係止突起２６の直上部まで深く形成されている。
【００２３】
ロックシャフト４の頭部上面に形成した回転受動部９は、角部を丸めた略三角形状の凹部によって構成されており、これに嵌合する操作軸１４の回転駆動部１６は同形状の凸部によって形成されている。この回転受動部９と回転駆動部１６の断面形状を適宜に変更することによって多数の鍵コードを設定できる。キーハンドル１３は握り部３６を含めればＴ字状に形成されている。筒状ケース２が嵌挿される垂直孔３５は、蓋１の上面板部に形成されている。
【００２４】
操作軸１５の先端部の施錠駆動部１７の内面形状は、正六角形の隣接二辺を円弧状とした非円形状に形成されており、これが嵌合する施錠軸１８の頭部すなわち回転制止部２９も同形状に形成されている。錠止板２０の受孔２１も同じ形状である。回転制止部２９の下側に形成される回転許容部３０は、受孔２１に内接する円形断面に形成されている。施錠駆動部１７などの断面形状を多様に変化させることによって、多数の鍵コードを設定できる。
【００２５】
錠前ユニット１２の外筒１９の内側面には軸線方向に制止溝４５が形成されており、錠止板２０の外側面には制止突起４６が形成されている。制止溝４５に制止突起４６が係合することによって、錠止板２０は外筒１９に対して上下方向に移動可能であって回転不能に拘束されている。
サポート体２３の外側面の環状溝４７には、外筒１９の側壁部を通して抜け止めピン４８が挿入されており、サポート体２３は外筒１９に対して回転可能及び抜取り不能に装着されている。
【００２６】
施錠軸１８の下面には偏心位置に駆動カム突起４９が突設されており、板状のロック体２７には駆動カム突起４９が挿入される受動カム溝５０を横断方向に形成してある。施錠軸１８を回転させると、駆動カム突起４９が受動カム溝５０の内側面を押すため、ロック体２７が施錠軸２８の軸線に対して直角方向に摺動し、外筒１９から出没する。
錠止板２０を上昇方向に付勢するバネ部材２２は圧縮コイルバネによって構成されており、サポート体２３の上面と錠止板２０の下面の間に挿入されている。
錠止板２０の制止突起４６の配置間隔と個数及び制止突起４６の幅寸法を変更したり、操作軸１５の環状突起３２の配設個数、環状突起３２の軸線方向の厚さ寸法を変更したりすることによっても、鍵コードを多数多様に設定変更できる。
【００２７】
ガイドピン１０は筒状ケース２の側面受孔５１に打ち込み固定されている。筒状ケース２の下面開口は底盤体５２によって閉塞されている。ガイドシャフト４は中間部が該底盤体５２の貫通孔５３に嵌挿されている。ガイドシャフト４の下部は断面角形に形成され、ロック板８の基端部の角孔５４に嵌合固着されている。
筒状ケース２の中間部外側面には、一対の平行な受溝３８が横断方向に形成されており、該受溝３８には平面視コ字状の定着板４０の一対の脚板部４１が密に嵌合されており、定着板４０は一対のボルト・ナット４２によって蓋１の下面部分３９に締め付け固着されている。
【００２８】
前記キャップ盤３４には雄螺子部５５が形成されており、キャップ盤３４は筒状ケース２の雌螺子部３に螺合される。キャップ盤３４の上面には、キーハンドル１３の操作軸１４の回転駆動部１６が嵌め込まれる回転受動部５６を設けてある。
キャップ盤３４の雄螺子部５５の根元部の環状溝５７には、Ｏ−リング５８が嵌め込まれている。また、筒状ケース２の上部外周面の環状溝３７にもＯ−リング５９が嵌め込まれている。
【００２９】
ロックシャフト４には排水孔６０が上下に貫通して形成されている。筒状ケース２の内側面には垂直方向にガイド溝６１が形成され、錠前ユニット１７の外筒１９の上部外面にはガイド突起６２が突設されている。錠前ユニット１７は、ガイド突起６２をガイド溝６１に合わせることによって筒状ケース２に嵌め落され、ガイド突起６２がガイド溝６１に係合することによって、錠前ユニット１２は筒状ケース１に対して相対回転不能に支持されている。
【００３０】
本発明では、筒状ケース２の上部空間にした錠前ユニット１２によってロックシャフト４の頭部上面の回転受動部９を隠蔽し、筒状ケース２に対して抜き取り不能に係止施錠された錠前ユニット１２を解放するには、錠前ユニット１２の施錠軸１８に嵌合する所定の施錠駆動部１７を有するキーハンドル１３がなければならないため、必要充分なセキュリティー機能を有する蓋用ロック装置が提供される。
【００３１】
また、錠前ユニット１２の抜き取り後、ロックシャフト４の回転受動部９にキーハンドル１３の回転駆動部１６を嵌め込んでロックシャフト４を所定方向に所要角度回転させると、ガイドピン１０とＬ字状カム溝５の協働作用によってロックシャフト４とロック板８が回転しながら上昇して、ロック板８が固定受枠６側のストライク７から離脱するため、解錠操作は操作ハンドル１３の回転操作のみによって簡単に行える。
【００３２】
更にまた、アイボルト１１は錠前ユニット１２を抜き取った後の筒状ケース２の雌螺子部部３に充分深く螺合されるため、重機による吊上げ・吊下げ作業が充分な支持力をもって安全に行なわれる。アイボルト１１は筒状ケース２に捻じ込まれ、筒状ケース２は蓋１内部に嵌挿固着されているため、吊上げ・吊下げ作業中にアンバランスな力が作用してもアイボルト１１や筒状ケース２が撓み変形したり、せん断されてしまい、蓋１の落下事故を招く危険がない。
【００３３】
【発明の効果】
以上のように構成された本発明では、請求項１の発明の前記効果に加えて、錠前ユニット１２の外筒１９内に錠止板２０を回転不能かつ上下方向に移動可能に収容し、錠止板２０をバネ部材２２によって上昇方向に付勢し、外筒１９の下部空間に収容したサポート体２３の軸孔２４に施錠軸１８の下部を挿入し、軸孔２４と交差するサポート体２３の側面孔２５にロック体２７を嵌挿し、連動カム機構を介して施錠軸１８にロック体２７を接続し、外筒１９の上部内側面に突設した抜差し規制体２８によって外筒１９に対するキーハンドル１３の抜差しを規制し、錠止板２０の非円形状の受孔２１に係合したとき、施錠軸１８を回転不能にする回転制止部２９を施錠軸１８の上部に形成し、また、前記受孔２１に係合したとき、施錠軸１８を回転可能にする回転許容部３０を回転制止部２９の下側に形成し、キーハンドル１３の操作軸１５の外周面に抜差し規制体２８の規制突起３１に当接する環状突起３２を形成し、環状突起３２に規制突起３１が通過可能な逃げ溝３３を形成してあるため、雨水や泥水に曝される劣悪な使用環境でも砂泥粒子によって目詰まりを起すことなく、信頼性高く使用され、必要充分なセキュリティー機能を有するものとなる。
【００３４】
また、ロック体２７がロック溝２６から離脱した状態においては、抜差し規制体２８の規制突起３１が操作軸１５の環状突起３２の下面側に係合しているため、錠前ユニット１２は操作軸１５を引き上げることによって、筒状ケース２から簡単に抜き取られ、作業性に優れている。
【図面の簡単な説明】
【図１】本発明の一実施例に係る蓋用ロック装置の施錠状態の縦断面図である。
【図２】図１の蓋用ロック装置において錠前ユニットを抜き取ったときの縦断面図である。
【図３】図１の蓋用ロック装置において、キーハンドルをロックシャフトに挿入したときの縦断面図である。
【図４】図１の蓋用ロック装置において、アイボルトを筒状ケースに捻じ込んだときの縦断面図である。
【図５】図１の蓋用ロック装置に使用した錠前ユニットの平面図である。
【図６】図５の錠前ユニットの縦断面図である。
【図７】図１の蓋用ロック装置に使用したキーハンドルの正面図である。
【図８】図７のキーハンドルにおける施錠駆動部の拡大正面図である。
【図９】図７のキーハンドルにおける施錠駆動部の底面図である。
【図１０】図７のキーハンドルにおける回転駆動部の底面図である。
【図１１】図５の錠前ユニットに使用する施錠軸の平面図である。
【図１２】図１１の施錠軸の正面図である。
【図１３】図５の錠前ユニットに使用する錠止板の平面図である。
【図１４】図１３の錠止板の正面図である。
【図１５】図１の蓋用ロック装置において、キーハンドルの施錠駆動部を錠前ユニットに挿入した状態の縦断面図である。
【図１６】図１５の状態からキーハンドルを押し下げたときの縦断面図である。
【符号の説明】
１蓋
２筒状ケース
３雌螺子部
４ロックシャフト
５カム溝
６固定受枠
７ストライク
８ロック板
９回転受動部
１０ガイドピン
１１アイボルト
１２錠前ユニット
１３キーハンドル
１４操作軸
１５操作軸
１６回転駆動部
１７施錠駆動部
１８施錠軸
１９外筒
２０錠止板
２１受孔
２２バネ部材
２３サポート体
２４軸孔
２５側面孔
２６係止突起
２７ロック体
２８抜差し規制体
２９回転制止部
３０回転許容部
３１規制突起
３２環状突起
３３逃げ溝
３４キャップ盤[0001]
[Technical field to which the invention belongs]
The present invention relates to a lid locking device provided in a communication cable, a power transmission cable, a manhole for entering and exiting a common groove for housing a water and sewage pipe, and the like.
[0002]
[Prior art]
In a conventional locking device that locks a manhole cover or the like so that it cannot be opened with respect to the fixed receiving frame in the closed position, the keyhole of the lock unit is exposed on the road, so that foreign matter is clogged with mud and the like, and it will not rotate. There is a fear.
[0003]
Further, since it is not easy to distinguish between the locked state and the unlocked state, there is a possibility that the user forgets to lock after closing the lid, and a person other than the authorized person may enter the common groove.
[0004]
Other locking devices for the lid include an outer cylinder that penetrates the lid in the vertical direction, a locking shaft that is rotatably accommodated in the outer cylinder, and a lower end portion of the locking shaft that is fixed on the fixed receiving frame side. The operation key includes a key code portion that is inserted into a key receiving recess formed at the upper end portion of the locking shaft at the distal end portion (for example, Patent Document 1).
[0005]
In this lid locking device, in order to prevent the key receiving portion of the locking shaft from becoming clogged due to intrusion of muddy water and making it difficult or impossible to insert the key, the shape of the key receiving portion is, for example, substantially triangular. It is formed in a simplified shape.
Because it is designed in consideration of such a special use environment, there is a point that security is inferior as a lock function, and it is not impossible to rotate the lock shaft by forcibly inserting a tool other than the original key. It was.
[0006]
[Patent Document 1]
Japanese Patent No. 3291269 [0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a manhole cover locking device which can withstand a poor use environment exposed to rainwater and muddy water and has a necessary and sufficient security function.
[0008]
[Means for Solving the Problems]
Hereinafter, a description will be given by using reference numerals in the accompanying drawings. A feature of the present invention is that a cylindrical case 2 that is vertically fixed to a lid 1 such as a manhole and has a female screw portion 3 formed on an inner peripheral surface of an upper half portion. The lock shaft 4 is inserted into the lower half of the cylindrical case 2 so as to be vertically movable and rotatable, and has an L-shaped cam groove 5 formed on the peripheral surface of the head. The lock plate 8 that engages and disengages with the strike 7 on the fixed receiving frame 6 side and the like, and is fixed to the inner surface of the lower half portion of the cylindrical case 2, and is locked by cooperation with the cam groove 5 when the lock shaft 4 is rotated. A guide pin 10 that moves the shaft 4 up and down, a lock unit 12 that is removably fitted into the cylindrical case 2 above the lock shaft 4, and two operating shafts 14 and 15 that intersect each other are provided. 4 head top surface A rotation drive unit 16 fitted to the rotation passive unit 9 is formed at the tip of one operation shaft 14, and a lock drive unit 17 fitted to the lock shaft 18 of the lock unit 12 is formed at the tip of the other operation shaft 15. The key handle 13 is formed on the part, and after the lock unit 12 is extracted from the cylindrical case 2 by using the lock driving unit 17, the lock shaft 4 is rotated by the rotation driving unit 16 of the key handle 13 to fix the fixed receiving frame. 6, a lid locking device such as a manhole in which the lid 1 is released from being fixed and the lid lifting eyebolt 11 is screwed into the female screw portion 3 of the cylindrical case 2 .
The lock unit 12 has an outer cylinder 19 inserted into the cylindrical case 2 and a non-circular receiving hole 21 into which the locking shaft 18 is inserted and received in the outer cylinder 19 so as not to be rotatable and movable in the vertical direction. A locking plate 20 formed at the center, a spring member 22 that urges the locking plate 20 in the upward direction, and a shaft hole 24 that is accommodated in the lower space of the outer cylinder 19 and into which the lower portion of the locking shaft 18 is inserted. The support body 23 formed in the center and the side hole 25 of the support body 23 intersecting with the shaft hole 24 are inserted and connected to the locking shaft 18 through an interlocking cam mechanism, corresponding to the rotation of the locking shaft 18. A lock body 27 that protrudes and protrudes at a position engageable with a locking protrusion 26 on the lower inner side surface of the cylindrical case 2 and a projecting projecting portion on the upper inner side surface of the outer cylinder 19. An upper part of the locking shaft The upper and lower portions of the rotation restraining portion 29 having a non-circular cross section that makes the locking shaft 18 non-rotatable and the rotation allowing portion 30 that allows the locking shaft 18 to rotate when engaged with the receiving hole 21 of the locking plate 20 The locking drive portion 17 of the key handle 13 is formed in a concave shape that matches the rotation stopping portion 29 of the locking shaft 18, and the outer peripheral surface of the operation shaft 15 of the key handle 13 adjacent to the locking drive portion 17. Is formed with an annular protrusion 32 that contacts the restriction protrusion 31 of the insertion / removal restricting body 28, and the annular protrusion 32 is formed with a relief groove 33 through which the restriction protrusion 31 can pass, and the lock body 27 is cylindrical. When the operation shaft 15 of the key handle 13 is rotated to a position disengaged from the locking collar portion 26 of the case 2, the restricting protrusion 31 engages with the lower surface of the annular protrusion 32, so that the key handle 13 cannot be removed. It is a thing.
[0009]
[Effects of the Invention]
According to the first aspect of the present invention, an operator who has been given the key handle 13 by the authorized manhole manager for work such as repair and replacement of the communication cable, inspection, etc. The operating shaft 15 is inserted into the lock unit 12, and the locking drive unit 17 of the operating shaft 15 is fitted to the locking shaft 18. After the lock shaft 18 is rotated in the unlocking direction by the key handle 13 to unlock the lock unit 12 with respect to the lid 1, the lock unit 12 is removed from the cylindrical case 2 as shown in FIG. 2.
[0010]
Next, as shown in FIG. 3, another operation shaft 14 of the key handle 13 is inserted from the upper surface opening of the cylindrical case 2, and the rotation drive unit 16 is fitted to the rotation passive unit 9 of the lock shaft 4, so that the lock shaft 4 is rotated together with the key handle 13 by a required angle in a predetermined direction.
At this time, in the first process from the appearance of the guide pin 10 to the horizontal portion 5a of the L-shaped cam groove 5 to the refraction intersection 5b, the lock plate 8 rotates in the horizontal direction and strikes on the fixed receiving frame 6 side. 7 is detached from the lower surface side. As a result, the locking and locking of the lid 1 with respect to the fixed receiving frame 60 is released. Next, in the next process in which the guide pin 10 apparently enters the vertical portion 5c from the refraction crossing portion 5b, the lock plate 8 is moved upward along the cylindrical case 2 integrally with the lock shaft 4 as shown in FIG. Moving.
[0011]
Thereafter, as shown in FIG. 4, the eyebolt 11 is screwed into the female screw portion 3 of the cylindrical case 2, and the end portion of the suspension member fed out from a heavy machine such as a crane is connected to the eyebolt 11, and the lid 1 is It is lifted and released. The worker enters a common groove or the like from a manhole that is fully open, and starts a predetermined work.
After the work is completed, the worker leaves the manhole on the street. After the lid 1 is suspended at a predetermined closed position of the fixed receiving frame 6 by using the heavy machinery, the eyebolt 11 is removed from the cylindrical case 2.
[0012]
The operation shaft 14 of the key handle 13 is inserted from the upper surface opening of the cylindrical case 2, the rotation drive portion 16 of the operation shaft 14 is fitted to the rotation passive portion 9 of the lock shaft 4, and the lock shaft 4 is connected to the key handle 13. Integrally rotate in the opposite direction. Apparently, in the process in which the guide pin 10 returns from the vertical portion 5c of the L-shaped cam groove 5 to the bending intersection 5b, the lock shaft 4 and the lock plate 8 move downward integrally, and from the bending intersection 5b to the horizontal portion 5a. In the returning process, the lock plate 8 rotates in the horizontal direction and enters the lower surface side of the strike 7. As a result, the locking of the lid 1 with respect to the fixed receiving frame 60 is established.
[0013]
Next, after the operation shaft 14 of the key handle 13 is pulled out from the cylindrical case 2, the lock unit 12 is fitted from the upper surface opening of the cylindrical case 2. Thereafter, another operation shaft 15 of the key handle 13 is inserted from the upper surface opening of the cylindrical case 2, and the lock driving portion 17 of the operation shaft 15 is fitted to the lock shaft 18 of the lock unit 12. The lock shaft 18 is rotated in the locking direction by the key handle 13, and the lock unit 12 is locked and locked to the cylindrical case 2 so that it cannot be removed.
Thereafter, the operating shaft 15 of the key handle 13 is removed from the cylindrical case 2 and the upper surface opening of the cylindrical case 2 is closed with a suitable cap board 34, and then the worker leaves the site.
[0014]
In the closed locking state of the lid 1, the rotation stopping portion 29 of the locking shaft 18 is engaged with the receiving hole 21 of the locking plate 20, and the locking shaft 18 is connected to the outer cylinder 19 via the locking plate 20. It is restrained so that it cannot rotate. Therefore, the lock body 27 that is interlocked with the locking shaft 18 is held at a locking position where the distal end portion can be engaged with the locking protrusion 26 of the cylindrical case 2.
[0015]
After inserting the operation shaft 15 on one side of the key handle 13 into the lock unit 12 and aligning the relief groove 33 of the annular protrusion 32 of the operation shaft 15 with the restriction protrusion 31 of the restriction body 28 as shown in FIG. When the key handle 13 is pushed down, the distal end surface of the locking drive portion 17 of the operation shaft 15 comes into contact with the locking plate 20. When the key handle 13 is further pushed down, the locking plate 20 moves downward against the bias of the spring member 22, and the locking drive unit 17 is fitted to the rotation blocking unit 29 of the locking shaft 18 as shown in FIG. On the other hand, the rotation allowing portion 30 of the locking shaft 18 is engaged with the receiving hole 21 of the locking plate 20. Therefore, the rotation restraint of the locking shaft 18 with respect to the outer cylinder 19 established via the locking plate 20 is released.
[0016]
When the operation shaft 15 of the key handle 13 is rotated in the unlocking direction at this stage, the locking shaft 18 rotates integrally with the operation shaft 15 around the shaft hole 24 of the support body 23, and the lock body 27 of the interlock cam mechanism. Since it slides in the immersing direction by the action and disengages from the lower surface side position of the locking projection 26 of the cylindrical case 2, the restraint of the lock unit 12 with respect to the cylindrical case 2 is released. In this state, since the restricting protrusion 31 of the insertion / removal restricting body 28 is engaged with the lower surface side of the annular protrusion 32 of the operation shaft 15, the lock unit 12 lifts the operation shaft 15 as shown in FIG. It is extracted from the cylindrical case 2.
[0017]
Next, as shown in FIG. 3, another operation shaft 14 of the key handle 13 is inserted into the cylindrical case 2, and the rotation drive portion 16 of the operation shaft 14 is fitted to the rotation passive portion 9 of the lock shaft 4. The lock shaft 4 is rotated together with the key handle 13 by a required angle in a predetermined direction.
At this time, in the first process from the appearance of the guide pin 10 to the horizontal portion 5a of the L-shaped cam groove 5 to the refraction intersection 5b, the lock plate 8 rotates in the horizontal direction and strikes on the fixed receiving frame 6 side. 7 is detached from the lower surface side. As a result, the locking and locking of the lid 1 with respect to the fixed receiving frame 60 is released. Next, in the next process in which the guide pin 10 apparently enters the vertical portion 5c from the refraction crossing portion 5b, the lock plate 8 is moved upward along the cylindrical case 2 integrally with the lock shaft 4 as shown in FIG. Moving.
[0018]
Thereafter, as shown in FIG. 4, the eyebolt 11 is screwed into the female screw portion 3 of the cylindrical case 2, and the end portion of the suspension member fed out from a heavy machine such as a crane is connected to the eyebolt 11, and the lid 1 is It is lifted and released. The worker enters the common groove from the manhole that is fully open.
After the work is completed, the lid 1 is suspended to a predetermined closed position by using the heavy machinery, and then the eyebolt 11 is removed from the cylindrical case 2.
[0019]
The operation shaft 14 of the key handle 13 is inserted into the cylindrical case 2, the rotation drive portion 16 of the operation shaft 14 is fitted to the rotation passive portion 9 of the lock shaft 4, and the lock shaft 4 is integrated with the key handle 13. Rotate in the opposite direction. Apparently, in the process in which the guide pin 10 returns from the vertical portion 5c of the L-shaped cam groove 5 to the bending intersection 5b, the lock shaft 4 and the lock plate 8 move downward integrally, and from the bending intersection 5b to the horizontal portion 5a. In the returning process, the lock plate 8 rotates in the horizontal direction and enters the lower surface side of the strike 7. As a result, the locking of the lid 1 with respect to the fixed receiving frame 60 is established.
[0020]
Next, after the operation shaft 14 of the key handle 13 is pulled out from the cylindrical case 2, the lock unit 12 is fitted from the upper surface opening of the cylindrical case 2, and the upper space of the lock shaft 4 is closed by the lock unit 12. Thereafter, the operation shaft 15 on one side of the key handle 13 is inserted into the lock unit 12, the escape groove 33 of the annular protrusion 32 of the operation shaft 15 is inserted and removed, and the position of the key handle 13 is adjusted with the restriction protrusion 31 of the restriction body 28. When pushed down, the distal end surface of the locking drive portion 17 of the operation shaft 15 contacts the locking plate 20. When the key handle 13 is further pushed down, the locking plate 20 moves downward against the bias of the spring member 22, and the locking drive unit 17 is fitted to the rotation blocking unit 29 of the locking shaft 18, while the locking plate 20 The rotation allowing portion 30 of the locking shaft 18 is engaged with the receiving hole 21. Therefore, the rotation constraint of the locking shaft 18 with respect to the outer cylinder 19 is released.
[0021]
At this stage, when the operation shaft 15 of the key handle 13 is turned in the locking direction, the locking shaft 18 rotates around the shaft hole 24 of the support body 23, and the lock body 27 slides in the protruding direction by the action of the interlock cam mechanism. The distal end portion of the lock body 27 comes to a position on the lower surface side of the locking projection 26 of the cylindrical case 2. As a result, the lock unit 12 is locked to the cylindrical case 2 so that it cannot be removed.
Thus, in the state where the lock unit 12 is locked so that it cannot be removed, the escape groove 33 of the annular protrusion 32 of the operation shaft 15 is located at a position facing the restriction protrusion 31 of the insertion / removal restrictor 28, so that the operation shaft By pulling 15 forward, the key handle 13 is pulled out of the lock unit 12. Thereafter, the operating shaft 15 of the key handle 13 is removed from the cylindrical case 2 and the upper surface opening of the cylindrical case 2 is closed with a suitable cap board 34, and then the worker leaves the site.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In the illustrated embodiment, the cam groove 5 is formed such that a portion from the end portion of the upper horizontal portion 5a to the refractive intersection portion 5b is inclined in a spiral shape, and the vertical portion 5c extends axially from the end portion of the refractive intersection portion 5b. It is formed straight.
The locking projection 26 with which the tip of the lock body 27 of the lock unit 12 engages is continuously formed in an inward hook shape on the inner surface of the intermediate portion of the cylindrical case. The female screw part 3 of the cylindrical case 2 is formed deeply up to the upper part of the locking projection 26.
[0023]
The rotary passive portion 9 formed on the upper surface of the head of the lock shaft 4 is constituted by a substantially triangular concave portion with rounded corners, and the rotary drive portion 16 of the operating shaft 14 fitted to the concave portion has the same shape. It is formed by the part. A large number of key codes can be set by appropriately changing the cross-sectional shapes of the rotation passive unit 9 and the rotation drive unit 16. The key handle 13 is formed in a T shape if the grip portion 36 is included. The vertical hole 35 into which the cylindrical case 2 is inserted is formed in the upper surface plate portion of the lid 1.
[0024]
The inner surface of the locking drive unit 17 at the tip of the operation shaft 15 is formed in a non-circular shape in which two adjacent sides of a regular hexagon are arcuate, and the head of the locking shaft 18 into which the locking shaft 17 is fitted, that is, the rotation restraint portion. 29 is also formed in the same shape. The receiving hole 21 of the locking plate 20 has the same shape. The rotation allowing portion 30 formed below the rotation stopping portion 29 is formed in a circular cross section that is inscribed in the receiving hole 21. A large number of key codes can be set by variously changing the cross-sectional shape of the locking drive unit 17 and the like.
[0025]
A stop groove 45 is formed in the axial direction on the inner side surface of the outer cylinder 19 of the lock unit 12, and a stop projection 46 is formed on the outer side surface of the lock plate 20. When the stop projection 46 is engaged with the stop groove 45, the lock plate 20 is movable in the vertical direction with respect to the outer cylinder 19 and is restricted so as not to rotate.
A retaining pin 48 is inserted into the annular groove 47 on the outer surface of the support body 23 through the side wall portion of the outer cylinder 19, and the support body 23 is attached to the outer cylinder 19 so as to be rotatable and unremovable. .
[0026]
A drive cam projection 49 is projected from the lower surface of the locking shaft 18 at an eccentric position, and a passive cam groove 50 into which the drive cam projection 49 is inserted is formed in the plate-like lock body 27 in the transverse direction. When the locking shaft 18 is rotated, the drive cam projection 49 pushes the inner surface of the passive cam groove 50, so that the lock body 27 slides in a direction perpendicular to the axis of the locking shaft 28 and protrudes and retracts from the outer cylinder 19.
The spring member 22 that urges the locking plate 20 in the upward direction is constituted by a compression coil spring, and is inserted between the upper surface of the support body 23 and the lower surface of the locking plate 20.
The arrangement interval and the number of the restraining projections 46 of the locking plate 20 and the width dimension of the restraining projection 46 are changed, the number of the annular projections 32 of the operation shaft 15 and the thickness dimension of the annular projection 32 in the axial direction are changed. By doing so, you can change the settings of many key codes.
[0027]
The guide pin 10 is driven and fixed in the side surface receiving hole 51 of the cylindrical case 2. The opening on the lower surface of the cylindrical case 2 is closed by the bottom plate body 52. An intermediate portion of the guide shaft 4 is inserted into the through hole 53 of the bottom plate body 52. The lower portion of the guide shaft 4 is formed in a square cross section, and is fitted and fixed to the square hole 54 in the base end portion of the lock plate 8.
A pair of parallel receiving grooves 38 are formed in the transverse direction on the outer surface of the intermediate portion of the cylindrical case 2, and a pair of leg plate portions 41 of a fixing plate 40 having a U-shape in plan view are formed in the receiving grooves 38. The fixing plate 40 is tightly fitted and fixed to the lower surface portion 39 of the lid 1 by a pair of bolts and nuts 42.
[0028]
The cap board 34 is formed with a male screw part 55, and the cap board 34 is screwed into the female screw part 3 of the cylindrical case 2. On the upper surface of the cap board 34, a rotation passive part 56 into which the rotation driving part 16 of the operation shaft 14 of the key handle 13 is fitted is provided.
An O-ring 58 is fitted in the annular groove 57 at the base of the male screw portion 55 of the cap board 34. An O-ring 59 is also fitted in the annular groove 37 on the upper outer peripheral surface of the cylindrical case 2.
[0029]
A drainage hole 60 is formed in the lock shaft 4 so as to penetrate vertically. A guide groove 61 is formed in the vertical direction on the inner side surface of the cylindrical case 2, and a guide protrusion 62 projects from the upper outer surface of the outer cylinder 19 of the lock unit 17. The lock unit 17 is fitted into the cylindrical case 2 by aligning the guide protrusion 62 with the guide groove 61, and the lock unit 12 is attached to the cylindrical case 1 by engaging the guide protrusion 62 with the guide groove 61. It is supported so that it cannot rotate relative to it.
[0030]
In the present invention , the lock passive unit 9 in the upper surface of the head of the lock shaft 4 is concealed by the lock unit 12 in the upper space of the cylindrical case 2, and is locked and locked to the cylindrical case 2 so that it cannot be removed. In order to release 12, the key handle 13 having a predetermined locking drive unit 17 fitted to the locking shaft 18 of the lock unit 12 must be provided, and thus a lid locking device having a necessary and sufficient security function is provided. .
[0031]
Further, after the lock unit 12 is extracted, when the rotation drive portion 16 of the key handle 13 is fitted into the rotation passive portion 9 of the lock shaft 4 and the lock shaft 4 is rotated by a required angle in a predetermined direction, the guide pin 10 and the L-shape are formed. Since the lock shaft 4 and the lock plate 8 are raised while rotating due to the cooperative action of the cam groove 5, and the lock plate 8 is detached from the strike 7 on the fixed receiving frame 6 side, the unlocking operation is only the rotation operation of the operation handle 13. Easy to do.
[0032]
Furthermore, since the eyebolt 11 is screwed sufficiently deeply into the female screw portion 3 of the cylindrical case 2 after the lock unit 12 is removed, the lifting and hanging operations by the heavy machinery can be safely performed with sufficient supporting force. . Since the eyebolt 11 is screwed into the cylindrical case 2 and the cylindrical case 2 is fitted and fixed inside the lid 1, the eyebolt 11 and the cylindrical shape are applied even if an unbalanced force is applied during the lifting / suspending operation. There is no danger that the case 2 will be bent and deformed or sheared, causing a fall accident of the lid 1.
[0033]
【The invention's effect】
In the present invention configured as described above, in addition to the effect of the invention of claim 1, the locking plate 20 is accommodated in the outer cylinder 19 of the lock unit 12 so as not to rotate and to be movable in the vertical direction. The stop plate 20 is urged by the spring member 22 in the upward direction, the lower part of the locking shaft 18 is inserted into the shaft hole 24 of the support body 23 accommodated in the lower space of the outer cylinder 19, and the support body 23 intersecting the shaft hole 24. A lock body 27 is inserted into the side hole 25 of the outer cylinder, and the lock body 27 is connected to the locking shaft 18 via an interlock cam mechanism. When the handle 13 is restricted from being inserted and removed and engaged with the non-circular receiving hole 21 of the locking plate 20, a rotation stopping portion 29 that makes the locking shaft 18 unrotatable is formed on the upper portion of the locking shaft 18. When engaged with the receiving hole 21, the locking shaft 18 is A rotation permitting portion 30 that allows rotation is formed on the lower side of the rotation restricting portion 29, and an annular protrusion 32 that contacts the restriction protrusion 31 of the insertion / removal restricting body 28 is formed on the outer peripheral surface of the operation shaft 15 of the key handle 13. Since the relief groove 33 through which the restricting protrusion 31 can pass is formed in the protrusion 32, it is used with high reliability without being clogged by sand mud particles even in a poor use environment exposed to rainwater or muddy water. It has sufficient security functions.
[0034]
Further, in a state where the lock body 27 is detached from the lock groove 26, the lock protrusion unit 12 is engaged with the lower surface side of the annular protrusion 32 of the operation shaft 15 because the restriction protrusion 31 of the insertion / removal restriction body 28 is engaged with the operation shaft 15. By pulling up, it is easily extracted from the cylindrical case 2 and is excellent in workability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a locking state of a lid locking device according to an embodiment of the present invention.
2 is a longitudinal sectional view when a lock unit is removed from the lid locking device of FIG. 1; FIG.
3 is a longitudinal sectional view of the lid locking device of FIG. 1 when a key handle is inserted into a lock shaft. FIG.
4 is a longitudinal sectional view of the lid locking device of FIG. 1 when an eyebolt is screwed into a cylindrical case.
5 is a plan view of a lock unit used in the lid locking device of FIG. 1. FIG.
6 is a longitudinal sectional view of the lock unit shown in FIG. 5. FIG.
7 is a front view of a key handle used in the lid locking device of FIG. 1. FIG.
8 is an enlarged front view of a locking drive unit in the key handle of FIG.
9 is a bottom view of a locking drive unit in the key handle of FIG. 7;
10 is a bottom view of a rotation driving unit in the key handle of FIG. 7;
11 is a plan view of a locking shaft used in the lock unit shown in FIG. 5. FIG.
12 is a front view of the locking shaft in FIG. 11. FIG.
13 is a plan view of a lock plate used in the lock unit shown in FIG. 5. FIG.
14 is a front view of the locking plate of FIG. 13;
15 is a longitudinal cross-sectional view of the lid locking device of FIG. 1 in a state in which the lock driving portion of the key handle is inserted into the lock unit.
16 is a longitudinal sectional view when the key handle is pushed down from the state of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cover 2 Cylindrical case 3 Female screw part 4 Lock shaft 5 Cam groove 6 Fixed receiving frame 7 Strike 8 Lock board 9 Rotation passive part 10 Guide pin 11 Eye bolt 12 Locking unit 13 Key handle 14 Operation shaft 15 Operation shaft 16 Rotation drive part 17 Locking drive part 18 Locking shaft 19 Outer cylinder 20 Locking plate 21 Receiving hole 22 Spring member 23 Support body 24 Shaft hole 25 Side hole 26 Locking protrusion 27 Locking body 28 Insertion / removal restricting body 29 Rotation stopping part 30 Rotation permitting part 31 Restriction protrusion 32 Annular projection 33 Escape groove 34 Cap board

Claims

A cylindrical case 2 that is vertically fixed to a lid 1 such as a manhole and has a female screw part 3 formed on the inner peripheral surface of the upper half part, and is inserted into the lower half part of the cylindrical case 2 so as to be vertically movable and rotatable. A lock shaft 4 having an L-shaped cam groove 5 formed on the peripheral surface thereof, a lock plate 8 connected to a lower portion of the lock shaft 4 and engaged with and disengaged from a strike 7 on the fixed receiving frame 6 side such as a manhole, and a cylindrical shape A guide pin 10 that is fixed to the inner surface of the lower half of the case 2 and moves the lock shaft 4 up and down in cooperation with the cam groove 5 when the lock shaft 4 is rotated, and a cylindrical case above the lock shaft 4. 2 is provided with a lock unit 12 that is removably fitted to the shaft 2 and two operating shafts 14 and 15 that intersect each other, and a rotation drive unit 16 that is fitted to the rotation passive portion 9 on the top surface of the head of the lock shaft 4. The tip of one operating shaft 14 The lock drive unit 17 formed on the lock shaft 18 of the lock unit 12 is fitted with the key handle 13 formed at the distal end of the other operation shaft 15. By using the lock drive unit 17, the lock drive unit 17 is used. After removing 12 from the cylindrical case 2, the lock shaft 4 is rotated by the rotation drive portion 16 of the key handle 13 to release the fixation of the lid 1 to the fixed receiving frame 6, and the female screw portion 3 of the cylindrical case 2 is covered with the lid. In a locking device for a lid such as a manhole in which a lifting eye bolt 11 is screwed ,
The lock unit 12 has an outer cylinder 19 inserted into the cylindrical case 2 and a non-circular receiving hole 21 into which the locking shaft 18 is inserted and received in the outer cylinder 19 so as not to be rotatable and movable in the vertical direction. A locking plate 20 formed at the center, a spring member 22 that urges the locking plate 20 in the upward direction, and a shaft hole 24 that is accommodated in the lower space of the outer cylinder 19 and into which the lower portion of the locking shaft 18 is inserted. The support body 23 formed in the center and the side hole 25 of the support body 23 intersecting with the shaft hole 24 are inserted and connected to the locking shaft 18 through an interlocking cam mechanism, corresponding to the rotation of the locking shaft 18. A lock body 27 that protrudes and protrudes at a position engageable with a locking collar portion 26 on the lower inner side surface of the cylindrical case 2, and protrudes from the upper inner side surface of the outer cylinder 19. And an insertion / removal restricting body 28 that regulates
At the upper part of the locking shaft 18, when engaged with the receiving hole 21 of the locking plate 20, a rotation stopping portion 29 having a non-circular cross section that makes the locking shaft 18 non-rotatable, and a rotation that allows the locking shaft 18 to rotate. The allowance portion 30 is formed up and down, and the lock driving portion 17 of the key handle 13 is formed in a concave shape that matches the rotation stop portion 29 of the lock shaft 18, and the key handle 13 adjacent to the lock drive portion 17 is formed. On the outer peripheral surface of the operation shaft 15, an annular protrusion 32 that contacts the restriction protrusion 31 of the insertion / removal restrictor 28 is formed, and the annular protrusion 32 is formed with a relief groove 33 through which the restriction protrusion 31 can pass. When the operating body 15 of the key handle 13 is rotated to a position where the lock body 27 is not engaged with the locking protrusion 26 of the cylindrical case 2, the restricting protrusion 31 is engaged with the lower surface of the annular protrusion 32, and the key handle It is characterized by making 13 impossible to extract Lid locking device, such as that manhole.