JP3640942B2

JP3640942B2 - Locking device for manhole cover

Info

Publication number: JP3640942B2
Application number: JP2002238612A
Authority: JP
Inventors: 満男中井
Original assignee: Takigen Manufacturing Co Ltd
Current assignee: Takigen Manufacturing Co Ltd
Priority date: 2002-08-19
Filing date: 2002-08-19
Publication date: 2005-04-20
Anticipated expiration: 2022-08-19
Also published as: JP2004076405A

Description

【０００１】
【発明が属する技術分野】
本発明は通信ケーブルや送電ケーブル、上下水道管を収容する共同溝等のマンホールの蓋に使用される施錠装置に関するものである。
【０００２】
【従来の技術】
マンホール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施錠装置には、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（特許第３２９１２６９号公報）。
【０００３】
このマンホール蓋用施錠装置では、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。
【０００４】
【発明が解決しようとする課題】
近年の過激派による通信システムに対する攻撃が危惧されている状況下では、共同溝等にテロリストがマンホールから侵入してケーブル切断等の破壊工作を行なわないようにするため、マンホール蓋用施錠装置もそのセキュリティー機能の増強が要請されている。
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、錠前ユニットを上下２段構えに使用しているため、セキュリティー機能が大幅に強化されたマンホール蓋用施錠装置を提供することである。
【０００５】
【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、本発明は、蓋１側に装備され、蓋１をマンホールの固定受枠２に対して閉鎖位置において施錠する第１錠前ユニット３と、第１錠前ユニット３の鍵用通路４に挿入され、蓋１側に対して抜き取り不能に拘束される第２錠前ユニット５とからなり、第２錠前ユニット５の鍵６によって第２錠前ユニット５を抜き取った後、第１錠前ユニット３の鍵７によって固定受枠２に対する蓋１の施錠を解除するようになっており、
蓋１を上下方向に貫通して蓋１に固着された棒状ハウジング８の下側部分に装備された第１錠前ユニット３は、棒状ハウジング８の中央軸孔９に回転可能に収容された施錠軸１０と、施錠軸１０の下端部に固着され、固定受枠２側の受金部１１と係合する止め金板１２とからなり、第１錠前ユニット３の鍵７には、施錠軸１０の上端部に形成した鍵受部１３に挿入される鍵コード部１４を先端部に形成してあり、
前記棒状ハウジング８の上側部分に装備される第２錠前ユニット５は、第１錠前ユニット３の鍵用通路４に挿入される筒状ケーシング１５と、筒状ケーシング１５に回転可能かつ上下方向に移動不能に収容され、雄型突起１７を上端部外周面に形成し、該雄型突起１７の谷径以下に直径を縮小した縮径部１８を雄型突起１７の下側に形成したロータ１６と、ロータ１６の前記雄型突起１７に符合した雌型突起２０を内周面に形成し、外周面に回転止め板部２１を形成した錠止板１９と、筒状ケーシング１５に収容され、錠止板１９を押し上げ付勢するバネ部材２５と、前記ロータ１６の下端部に固着され、先端部が前記棒状ハウジング８の内周面に形成した錠止溝２６に係脱するロック板２７とからなり、
第２錠前ユニット５の鍵６には、ロータ１６の前記雄型突起１７に符合した雌型突起２８を筒部内周面に形成してあり、該鍵６によって前記ロータ１６を所定角度回したとき、前記ロック板２７が前記錠止溝２６から脱出して前記筒状ケーシング１５の外周輪郭内に収まるようにしたマンホール蓋用施錠装置に係るものである。
【０００６】
本発明の特徴とするところは、筒状ケーシング１５の上半部にホルダー筒２２が嵌め込み固着され、ホルダー筒２２の上端部に内向き突起２３が等間隔に４個形成され、ホルダー筒２２の下部側壁に縦溝２４が一対に形成されており、前記鍵６の筒部外周面にはホルダー筒２２の前記内向き突起２３に符合した４個の軸方向溝２９と各軸方向溝２９の上端部に交差する円周方向溝３０とが形成されており、ロータ１６の前記雄型突起１７が円周方向に山部と谷部を波状に連続形成したものであり、錠止板１９の前記雌型突起２０が円周方向に山部と谷部を波状に連続形成したものであり、錠止板１９の前記回転止め板部２１が一対に形成されており、第２錠前ユニット５の鍵６の前記雌型突起２８が円周方向に山部と谷部を波状に連続形成したものであり、
前記ロータ１６と前記錠止板１９との係合が前記雄型突起１７と前記雌型突起２０との係合によってなされ、前記錠止板１９とホルダー筒２２との係合が前記回転止め板部２１と前記縦溝２４との係合によってなされ、前記第２錠前ユニット５の前記鍵６と前記ロータ１６との係合が前記雌型突起２９と前記雄型突起１７との係合によってなされ、前記第２錠前ユニット５の前記鍵６と前記筒状ケーシング１５との係合が前記内向き突起２３と前記円周方向溝３０との係合によってなされることである。
【０００７】
【発明の作用】
本発明のマンホール蓋用施錠装置では、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第１錠前ユニット３の鍵７と第２錠前ユニット５の鍵６を渡された作業員は、図４に示したように上段側に配置されている第２錠前ユニット５に鍵６を挿入し、鍵６の雌型突起２８をロータ１６の雄型突起１７に嵌め合わせるとともに、鍵６の軸方向溝２９をホルダー筒２２の内向き突起２３に嵌め合わせて、バネ部材２５の付勢に抗して錠止板１９を鍵６によって押し下げる。図２７に示したように錠止板１９がホルダー筒２２の縦溝２４に案内されてロータ１６の軸線に沿って下方移動し、錠止板１９の雌型突起２０がロータ１６の雄型突起１７から離脱してロータ１６の縮径部１８に対面する位置に来ると、筒状ケーシング１５に対するロータ１６の回転拘束が解除される。
【０００８】
この段階では、ホルダー筒２２の内向き突起２３は鍵６の軸方向溝２９を通り抜けて鍵６の円周方向溝３０に入り込んでおり、第２錠前ユニット５の鍵６を所定角度回転操作すると、ロータ１６が回転し、ロータ１６の回転に追随してホルダー筒２２の内向き突起２３が見掛け上、鍵６の円周方向溝３０内を移動する。
ロータ１６に連結されているロック板２７が、図１１に２点鎖線で示した位置に回転することによって、ロック板２７の先端部が棒状ハウジング８側の錠止溝２６から脱出し、図９に示したようにロック板２７の全体が筒状ケーシング１５の外周輪郭内に引き込まれる。
【０００９】
これによって棒状ハウジング８に対する第２錠前ユニット５の拘束が解除される。この段階では、鍵６の円周方向溝３０の下側溝壁面にホルダー筒２２の内向き突起２３が係合しているため、鍵６を手前に引くことによって、図５に示したように第２錠前ユニット５が棒状ハウジング８の第１錠前ユニット３の鍵用通路４から抜き取られる。
【００１０】
図６に示したように第２錠前ユニット５による閉塞を解かれた前記鍵用通路４を通して第１錠前ユニット３の鍵７を挿入し、鍵７の先端部の鍵コード部１４を施錠軸１０の上端部の鍵受部１３に嵌め合わせる。鍵７を回すことによって施錠軸１０を棒状ハウジング８の軸線を中心として所定角度回転させ、施錠軸１０の下端部の止め金板１２を固定受枠２側の受金部１１から離脱させる。この後、蓋１を開放して作業員が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。
【００１１】
所要の作業を終了した作業員はマンホールから路上に出て蓋２を閉鎖する。次に第１錠前ユニット３の鍵７を回して止め金板１２を図２に示したように固定受枠２側の受金部１１に係合させ、蓋１をマンホールの固定受枠２に対して施錠する。第１錠前ユニット３の鍵７を棒状ハウジング８から抜き取った後、第２錠前ユニット５を第１錠前ユニット３の鍵用通路４に挿入し、第２錠前ユニット５の鍵６によってロータ１６を回し、図４及び図８に示したようにロック板２７を棒状ハウジング８側の錠止溝２６に係合させる。
このように第２錠前ユニット５を棒状ハウジング８に対して抜き取り不能に拘束し、前記鍵用通路４を閉塞した後、第２錠前ユニット５の鍵６を抜き取り、作業員は現場を立ち去る。
【００１２】
【発明の実施の態様】
図示した本発明の実施例では、棒状ハウジング８は蓋１の上下方向の貫通孔６４に嵌挿されている。貫通孔６４の上部に形成された拡径空洞部３２には、ゴムやプラスチック製の防水・防塵用の栓部材３３が嵌め込み固定されている。棒状ハウジング８の拡大頭部３４は拡径空洞部３２の内底面３５に突き当てられており、棒状ハウジング８は外周螺子部３６に嵌められたナット３７によって蓋１に締め付け固着されている。棒状ハウジング８の拡大頭部３４には防水・防塵用の金属製キャップ３８が被せられている。
【００１３】
第２錠前ユニット５の筒状ケーシング１５の上端部には、棒状ハウジング８の前記鍵用通路４の上端部の環状段部３９に係合するフランジ部４０を形成してある。錠止溝２６は前記鍵用通路４の内周面に環状に形成されている。ホルダー筒２２２は下部側壁の横孔４１と筒状ケーシング１５の上部側壁の横孔４２に打ち込まれた固定ピン４３によって筒状ケーシング１５に固着されている。筒状ケーシング１５の縮径された下部側壁には直径方向に水抜き孔４４が形成されている。
【００１４】
ロータ１６が嵌挿されている軸孔４５は筒状ケーシング１５の軸心から一側に偏移しており、ロック板２７を筒状ケーシング１５の外周輪郭内に収め易いように配慮されている。ロータ１６の中間大径部４６は筒状ケーシング１５の底壁部４７に当接しており、軸孔４５から突出したロータ１６の周面には止め輪４８を受け入れる環状溝４９を形成してある。バネ部材２５は圧縮コイルバネによって構成されており、ロータ１６の中間大径部４６と錠止板１９の間で圧縮負荷されている。
【００１５】
ロータ１６の下端部５０は非円形断面に形成され、ロック板２７の基端部の非円形透孔５１が相対回転不能に嵌め合わせられている。該ロータ下端部５０にはロック板２７の脱落防止用の帯金部材５２が通される透孔５３を直径方向に形成してある。
第１錠前ユニット３の鍵７は、Ｔ字状ハンドル５４の軸部先端に鍵コード部１４を形成したものであり、鍵コード部１４は角部を丸めた略三角形状の突起部によって構成されている。これに対応して施錠軸１０の上端大径部３１に形成された鍵受部１３は、略三角形状の凹部によって構成されている。
【００１６】
第２錠前ユニット５の鍵６は、Ｔ字状ハンドル５５の軸部先端を筒状に形成し、該筒部内周面に雌型突起２８を形成したものである。ロータ１６の雄型突起１７、錠止板１９の雌型突起２０および鍵６の雌型突起２８は、円周を１６等分して８個の山部と８個の谷部を波状に連続形成したものである。
棒状ハウジング８の上端面と鍵６の側面には、位置合わせ用指標として小さな凹部５６，５７を形成してある。鍵６のＴ字状ハンドル５５の一端部には前記キャップ３８を吸着するためのマグネットを装着することもできる。
【００１７】
ホルダー筒２２の前記内向き突起２３の上面肩部には、鍵６の嵌め合わせ操作を円滑にするため、内側に傾斜したカム面５８を形成してある。ロック板２７の基端部には回転角度を９０度に規制するための規制切欠６０が形成されており、筒状ケーシング１５の底面には，規制切欠６０と係脱する規制突起５９を形成してある。施錠軸１０の下端部６１は非円形断面に形成され、該下端部６１は止め金板１２の基端部の非円形孔６３に相対回転不能に嵌められ、止め金板１２はナット６２によって締め付け固定されている。
【００１８】
【発明の効果】
以上のように本発明のマンホール蓋用施錠装置では、棒状ハウジング８の下側部分に第１錠前ユニット３が装備され、棒状ハウジング８の上側部分に第２錠前ユニット５が第１錠前ユニット３の鍵用通路４を閉塞するように配置されており、この第２錠前ユニット５を抜取るには、鍵６の雌型突起２８をロータ１６の雄型突起１７に嵌め合わせるとともに、鍵６の軸方向溝２９をホルダー筒２２の４個の内向き突起２３に嵌め合わせてから、バネ部材２５に抗して錠止板１９を錠止板１９の雌型突起２０がロータ１６の雄型突起１７から離脱してロータ１６の縮径部１８に対面する位置に来るまで押し、その段階で鍵６を所定角度回転操作してロック板２７の先端部を棒状ハウジング８側の錠止溝２６から脱出させて、ロック板２７の全体を筒状ケーシング１５の外周輪郭内に引き込む必要があるため、マンホールへの侵入企図者からのアクセスを最初に受ける錠前ユニットとして第２錠前ユニット５は十分に高いセキュリティー機能を有するものであり、下段側の第１錠前ユニット３と合わせてマンホール蓋用施錠装置としてのセキュリティー機能が強化されることになる。また、上記各錠前ユニットの構成によって、雨水や泥水に曝される劣悪な使用環境に耐えるものである。
【００１９】
さらにまた、前記のように鍵６を解錠方向に所定角度回転させたときには、鍵６の円周方向溝３０の下側溝壁面にホルダー筒２２の内向き突起２３が係合しているため、鍵６を手前に引くことによって、第２錠前ユニット５が棒状ハウジング８の第１錠前ユニット３の鍵用通路４から確実に抜き取られることになり、鍵６の回転から第２錠前ユニット５の抜き取りまでの操作が一連の動作によって簡単かつ的確になされる。
【００２０】
ロータ１６の雄型突起１７、錠止板１９の雌型突起２０および鍵６の雌型突起２８のピッチ間隔や形状大きさを変更することによって、また、ホルダー筒２２の内向き突起２３と鍵６の軸方向溝２９の幅寸法、鍵６の円周方向溝３０の幅寸法を変更することによって、非常に多くの鍵違いを得ることができ、施錠装置としてのセキュリティーを向上させることができる。
【００２１】
また、ロータ１６と錠止板１９の係合が、円周方向に山部と谷部を波状に連続形成してなる前記雄型突起１７と前記雌型突起２０の係合によってなされ、錠止板１９とホルダー筒２２の係合が一対の回転止め板部２１と一対の縦溝２４の係合によってなされているため、マンホールへの不正侵入企図者がロータ１６を何等かの工具で掴んで回そうとしても、その負荷外力は均等に分散して働くので、機械的破壊に対して抵抗力が大であり、不正解錠に対して強くなる。
他方、鍵６とロータ１６の係合が、円周方向に山部と谷部を波状に連続形成してなる前記雄型突起１７と前記雌型突起２９の係合によってなされているため、鍵６を保有するマンホールの正当管理者は、十分に大きな回転駆動力をロータ１６に付与することができる。
また、鍵６と筒状ケーシング１５の係合がホルダー筒２２の４個の内向き突起２３と鍵６の円周方向溝３０との係合によってなされているため、筒状ケーシング１５に十分に大きな牽引力を円周方向に沿って均等に働かせることができ、第２錠前ユニット５の抜き取り操作が軽快かつ円滑になされる。
【図面の簡単な説明】
【図１】本発明の一実施例に係るマンホール蓋用施錠装置の使用状態の平面図である。
【図２】図１の蓋用施錠装置の施錠状態における縦断面図である。
【図３】図２の蓋用施錠装置において栓部材とキャップを外したときの縦断面図である。
【図４】図３の蓋用施錠装置において第２錠前ユニットの鍵を挿入した状態の縦断面図である。
【図５】図４の蓋用施錠装置において第２錠前ユニットを抜取った状態の縦断面図である。
【図６】図５の蓋用施錠装置において第１錠前ユニットの鍵を挿入した状態の縦断面図である。
【図７】図３の蓋用施錠装置において栓部材とキャップの図示を省略したときの平面図である。
【図８】図７のＡ−Ａ線断面図である。
【図９】図７のＢ−Ｂ線断面図である。
【図１０】図７のＣ−Ｃ線断面図である。
【図１１】図２の蓋用施錠装置に使用した第２錠前ユニットの底面図である。
【図１２】図２の蓋用施錠装置に使用した第２錠前ユニットの筒状ケーシング、ホルダー筒、ロータ、錠止板、止め輪及びロック板の分解状態の縦断面図である。
【図１３】図１２の筒状ケーシングの平面図である。
【図１４】図１３の筒状ケーシングの底面図である。
【図１５】図１３のＤ−Ｄ線断面図である。
【図１６】図１２のホルダー筒の平面図である。
【図１７】図１５のホルダー筒の底面図である。
【図１８】図１２のロータの平面図である。
【図１９】図１８のＥ−Ｅ線断面図である。
【図２０】図１９のロータの底面図である。
【図２１】図１２の錠止板の平面図である。
【図２２】図２の蓋用施錠装置に使用した第２錠前ユニットの鍵の正面図である。
【図２３】図２２の鍵の要部を縦断した右側面図である。
【図２４】図２２の鍵の底部端面である。
【図２５】図２の蓋用施錠装置に使用した第１錠前ユニットの鍵の正面図である。
【図２６】図２５のＦ−Ｆ線断面図である。
【図２７】図２の蓋用施錠装置において第２錠前ユニットの鍵を押し下げた状態の縦断面図である。
【符号の説明】
１蓋
２固定受枠
３第１錠前ユニット
４鍵用通路
５第２錠前ユニット
６第２錠前ユニットの鍵
７第１錠前ユニットの鍵
８棒状ハウジング
９中央軸孔
１０施錠軸
１１固定受枠側の受金部
１２止め金板
１３鍵受部
１４鍵コード部
１５筒状ケーシング
１６ロータ
１７雄型突起
１８縮径部
１９錠止板
２０雌型突起
２１回転止め板部
２２ホルダー筒
２３内向き突起
２４縦溝
２５バネ部材
２６錠止溝
２７ロック板
２８雌型突起
２９軸方向溝
３０円周方向溝[0001]
[Technical field to which the invention belongs]
The present invention relates to a locking device used for a manhole cover such as a communication groove, a power transmission cable, and a common groove for housing a water and sewage pipe.
[0002]
[Prior art]
In a conventional locking device that locks a manhole cover in a closed position so that it cannot be opened with respect to a fixed receiving frame, an outer cylinder that penetrates the lid in the vertical direction, a locking shaft that is rotatably accommodated in the outer cylinder, A lock plate fixed to the lower end portion of the locking shaft and engaged with the receiving portion on the fixed receiving frame side. The operation key includes a key inserted into a key receiving recess formed on the upper end portion of the locking shaft. There exists what formed the code | cord | chord part in the front-end | tip part (patent 3291269).
[0003]
In this manhole cover locking device, in order to prevent the key receiving portion of the locking shaft from clogging 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.
[0004]
[Problems to be solved by the invention]
In a situation where attacks on communication systems by extremists in recent years are concerned, manhole cover locking devices are also used in order to prevent terrorists from entering manholes and doing destructive work such as cable cutting. There is a demand for enhanced security functions.
Therefore, an object of the present invention is to provide a manhole cover locking device with a significantly enhanced security function because it can withstand a poor use environment exposed to rainwater and muddy water, and the lock unit is used in two upper and lower stages. Is to provide.
[0005]
[Means for Solving the Problems]
Hereinafter, the present invention will be described using reference numerals in the accompanying drawings. The present invention is provided with a first lock unit 3 which is provided on the lid 1 side and locks the lid 1 with respect to a fixed receiving frame 2 of a manhole in a closed position; The second lock unit 5 is inserted into the key passage 4 of the lock unit 3 and restrained so as not to be pulled out with respect to the lid 1, and the second lock unit 5 is pulled out by the key 6 of the second lock unit 5. After that, the lock of the lid 1 on the fixed receiving frame 2 is released by the key 7 of the first lock unit 3 ,
The first lock unit 3 mounted on the lower portion of the rod-shaped housing 8 that passes through the lid 1 in the vertical direction and is fixed to the lid 1 is a locking shaft that is rotatably accommodated in the central shaft hole 9 of the rod-shaped housing 8. 10 and a stopper plate 12 fixed to the lower end portion of the locking shaft 10 and engaged with the receiving portion 11 on the fixed receiving frame 2 side. The key 7 of the first lock unit 3 has an upper end of the locking shaft 10. A key code part 14 to be inserted into the key receiving part 13 formed in the part is formed at the tip part,
The second lock unit 5 mounted on the upper portion of the rod-shaped housing 8 is a cylindrical casing 15 inserted into the key passage 4 of the first lock unit 3, and the cylindrical casing 15 is rotatable and vertically movable. are incapable of accommodating, to form a male projection 17 on the upper end portion outer peripheral surface, the rotor 16 forming a reduced diameter portion 18 obtained by reducing the diameter under the valley diameter or less of the male collision force 17 on the lower side of the male protrusions 17 A female projection 20 corresponding to the male projection 17 of the rotor 16 is formed on the inner peripheral surface, and a locking plate 19 having a rotation stopper plate portion 21 formed on the outer peripheral surface; A spring member 25 that pushes up and biases the locking plate 19; a lock plate 27 that is fixed to the lower end portion of the rotor 16 and that engages and disengages in a locking groove 26 formed on the inner peripheral surface of the rod-shaped housing 8; Consists of
The key 6 of the second lock unit 5 has a female projection 28 formed on the inner peripheral surface of the cylinder portion that coincides with the male projection 17 of the rotor 16, and when the rotor 16 is rotated by a predetermined angle by the key 6. The lock plate 27 is related to a manhole cover locking device in which the lock plate 27 escapes from the locking groove 26 and falls within the outer peripheral contour of the cylindrical casing 15 .
[0006]
A feature of the present invention is that the holder cylinder 22 is fitted and fixed to the upper half of the cylindrical casing 15, and four inward projections 23 are formed at equal intervals on the upper end of the holder cylinder 22. A pair of vertical grooves 24 are formed in the lower side wall, and four axial grooves 29 corresponding to the inward projections 23 of the holder cylinder 22 and each axial groove 29 are formed on the outer peripheral surface of the cylindrical portion of the key 6. A circumferential groove 30 intersecting with the upper end portion is formed, and the male projection 17 of the rotor 16 is formed by continuously forming a crest and a trough in the circumferential direction in a wavy shape. The female projection 20 is formed by continuously forming a crest and a trough in a circumferential shape in the circumferential direction, the rotation stop plate 21 of the lock plate 19 is formed in a pair, and the second lock unit 5 The female projection 28 of the key 6 continuously forms a peak and a valley in the circumferential direction in a wavy shape. It is those,
The engagement of the rotor 16 and the locking plate 19 is made by engagement of the female protrusions 20 and the male protrusions 17, engaging said rotation stopper plate with the locking plate 19 and the holder tube 22 Engagement of the key 21 and the rotor 16 of the second lock unit 5 is achieved by engagement of the female projection 29 and the male projection 17. The engagement between the key 6 of the second lock unit 5 and the cylindrical casing 15 is achieved by the engagement between the inward projection 23 and the circumferential groove 30.
[0007]
[Effects of the Invention]
In the manhole cover locking device of the present invention, the key 7 of the first lock unit 3 and the key 6 of the second lock unit 5 are handed over from the authorized manager of the manhole for work such as repair and replacement of the communication cable and inspection. The operator inserts the key 6 into the second lock unit 5 arranged on the upper side as shown in FIG. 4, and fits the female projection 28 of the key 6 to the male projection 17 of the rotor 16. The axial groove 29 of the key 6 is fitted into the inward projection 23 of the holder cylinder 22, and the locking plate 19 is pushed down by the key 6 against the bias of the spring member 25. And downward movement along the axis of the rotor 16 Jotomeban 19 as shown in FIG. 27 is guided by the vertical grooves 24 of the holder cylinder 22, the female protrusions 20 of Jotomeban 19 male projection of the rotor 16 When it comes off from 17 and comes to a position facing the reduced diameter portion 18 of the rotor 16, the rotation restraint of the rotor 16 with respect to the cylindrical casing 15 is released.
[0008]
At this stage, the inward projection 23 of the holder cylinder 22 passes through the axial groove 29 of the key 6 and enters the circumferential groove 30 of the key 6, and when the key 6 of the second lock unit 5 is rotated by a predetermined angle. The rotor 16 rotates, and the inward projection 23 of the holder cylinder 22 apparently moves in the circumferential groove 30 of the key 6 following the rotation of the rotor 16.
When the lock plate 27 connected to the rotor 16 rotates to the position shown by the two-dot chain line in FIG. 11, the tip of the lock plate 27 comes out of the locking groove 26 on the rod-shaped housing 8 side, and FIG. As shown in FIG. 2, the entire lock plate 27 is drawn into the outer peripheral contour of the cylindrical casing 15.
[0009]
As a result, the restraint of the second lock unit 5 with respect to the rod-shaped housing 8 is released. At this stage, since the inward projection 23 of the holder cylinder 22 is engaged with the lower groove wall surface of the circumferential groove 30 of the key 6, the key 6 is pulled toward the front as shown in FIG. The two-lock unit 5 is extracted from the key passage 4 of the first lock unit 3 of the rod-shaped housing 8.
[0010]
As shown in FIG. 6, the key 7 of the first lock unit 3 is inserted through the key passage 4 that has been unblocked by the second lock unit 5, and the key code portion 14 at the tip of the key 7 is inserted into the lock shaft 10. It is fitted to the key receiving part 13 at the upper end of. By rotating the key 7, the locking shaft 10 is rotated by a predetermined angle about the axis of the rod-shaped housing 8, and the stopper plate 12 at the lower end of the locking shaft 10 is detached from the receiving portion 11 on the fixed receiving frame 2 side. Thereafter, the lid 1 is opened, and the worker enters the common groove or the like from the manhole and starts a predetermined work.
[0011]
The worker who has completed the required work exits from the manhole onto the road and closes the lid 2. Next, the key 7 of the first lock unit 3 is turned to engage the stopper plate 12 with the receiving portion 11 on the fixed receiving frame 2 side as shown in FIG. 2, and the lid 1 is fixed to the fixed receiving frame 2 of the manhole. Lock. After removing the key 7 of the first lock unit 3 from the rod-shaped housing 8, the second lock unit 5 is inserted into the key passage 4 of the first lock unit 3, and the rotor 16 is rotated by the key 6 of the second lock unit 5. 4 and 8, the lock plate 27 is engaged with the locking groove 26 on the rod-shaped housing 8 side.
In this way, the second lock unit 5 is restrained from being removed from the rod-shaped housing 8 and the key passage 4 is closed. Then, the key 6 of the second lock unit 5 is removed, and the worker leaves the site.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
In the illustrated embodiment of the present invention, the rod-shaped housing 8 is fitted into the through-hole 64 in the vertical direction of the lid 1. A waterproof / dustproof plug member 33 made of rubber or plastic is fitted and fixed in the enlarged diameter cavity 32 formed in the upper part of the through hole 64. The enlarged head 34 of the rod-shaped housing 8 is abutted against the inner bottom surface 35 of the diameter-expanded cavity 32, and the rod-shaped housing 8 is fastened and fixed to the lid 1 by a nut 37 fitted to the outer peripheral screw portion 36. The enlarged head 34 of the rod-shaped housing 8 is covered with a metal cap 38 for waterproofing and dustproofing.
[0013]
At the upper end of the cylindrical casing 15 of the second lock unit 5, a flange 40 is formed that engages with the annular step 39 at the upper end of the key passage 4 of the rod-shaped housing 8. The locking groove 26 is formed in an annular shape on the inner peripheral surface of the key passage 4. The holder cylinder 222 is fixed to the cylindrical casing 15 by a horizontal hole 41 in the lower side wall and a fixing pin 43 driven into the horizontal hole 42 in the upper side wall of the cylindrical casing 15. A drain hole 44 is formed in the diametrical direction in the reduced lower side wall of the cylindrical casing 15.
[0014]
The shaft hole 45 into which the rotor 16 is inserted is shifted to one side from the axial center of the cylindrical casing 15, so that the lock plate 27 can be easily accommodated in the outer peripheral contour of the cylindrical casing 15. . The intermediate large diameter portion 46 of the rotor 16 is in contact with the bottom wall portion 47 of the cylindrical casing 15, and an annular groove 49 for receiving a retaining ring 48 is formed on the peripheral surface of the rotor 16 protruding from the shaft hole 45. . The spring member 25 is constituted by a compression coil spring, and is compressed between the intermediate large diameter portion 46 of the rotor 16 and the locking plate 19.
[0015]
A lower end portion 50 of the rotor 16 is formed in a non-circular cross section, and a non-circular through hole 51 at a base end portion of the lock plate 27 is fitted so as not to be relatively rotatable. A through hole 53 through which a band member 52 for preventing the lock plate 27 from falling off is formed in the rotor lower end portion 50 in the diameter direction.
The key 7 of the first lock unit 3 is formed by forming a key code part 14 at the tip of the shaft part of the T-shaped handle 54, and the key code part 14 is constituted by a substantially triangular protrusion having rounded corners. ing. Correspondingly, the key receiving portion 13 formed in the upper end large diameter portion 31 of the locking shaft 10 is constituted by a substantially triangular recess.
[0016]
The key 6 of the second lock unit 5 is such that the tip of the shaft portion of the T-shaped handle 55 is formed in a cylindrical shape, and a female projection 28 is formed on the inner peripheral surface of the cylindrical portion. The male projection 17 of the rotor 16, the female projection 20 of the locking plate 19, and the female projection 28 of the key 6 divide the circumference into 16 equal parts and continuously wave the 8 peaks and 8 valleys. Formed.
Small concave portions 56 and 57 are formed on the upper end surface of the rod-shaped housing 8 and the side surface of the key 6 as alignment indexes. A magnet for attracting the cap 38 can be attached to one end of the T-shaped handle 55 of the key 6.
[0017]
An inwardly inclined cam surface 58 is formed on the shoulder of the upper surface of the inward projection 23 of the holder cylinder 22 in order to facilitate the fitting operation of the key 6. A restriction notch 60 for restricting the rotation angle to 90 degrees is formed at the base end portion of the lock plate 27, and a restriction protrusion 59 that engages with and disengages from the restriction notch 60 is formed on the bottom surface of the cylindrical casing 15. It is. The lower end 61 of the locking shaft 10 is formed in a non-circular cross section, and the lower end 61 is fitted into the non-circular hole 63 at the base end of the stopper plate 12 so as not to rotate relative to the stopper plate 12. It is fixed.
[0018]
【The invention's effect】
As described above, in the manhole cover locking device of the present invention, the first lock unit 3 is mounted on the lower portion of the rod-shaped housing 8, and the second lock unit 5 is mounted on the upper portion of the rod-shaped housing 8. The key passage 4 is disposed so as to be closed. To remove the second lock unit 5, the female projection 28 of the key 6 is fitted to the male projection 17 of the rotor 16, and the shaft of the key 6 is After the direction groove 29 is fitted to the four inward projections 23 of the holder cylinder 22, the locking plate 19 is opposed to the spring member 25, and the female projection 20 of the locking plate 19 is the male projection 17 of the rotor 16. Is pushed until it comes to a position facing the reduced diameter portion 18 of the rotor 16, and at that stage, the key 6 is rotated by a predetermined angle so that the distal end portion of the lock plate 27 escapes from the locking groove 26 on the rod-shaped housing 8 side. Let the entire lock plate 27 The second lock unit 5 has a sufficiently high security function as the lock unit that first receives access from the person who intends to enter the manhole because it needs to be drawn into the outer contour of the casing 15. Together with the first lock unit 3, the security function as a manhole cover locking device is strengthened. In addition, the structure of each lock unit can withstand a poor use environment exposed to rainwater and muddy water.
[0019]
Furthermore, when the key 6 is rotated by a predetermined angle in the unlocking direction as described above, the inward projection 23 of the holder tube 22 is engaged with the lower groove wall surface of the circumferential groove 30 of the key 6. By pulling the key 6 forward, the second lock unit 5 is surely extracted from the key passage 4 of the first lock unit 3 of the rod-shaped housing 8, and the second lock unit 5 is extracted from the rotation of the key 6. The operations up to are simply and accurately performed by a series of operations.
[0020]
By changing the pitch interval and shape size of the male projection 17 of the rotor 16, the female projection 20 of the locking plate 19, and the female projection 28 of the key 6, the inward projection 23 of the holder cylinder 22 and the key By changing the width dimension of the six axial grooves 29 and the width dimension of the circumferential groove 30 of the key 6, a great number of key differences can be obtained, and security as a locking device can be improved. .
[0021]
Further, the engagement between the rotor 16 and the locking plate 19 is made by the engagement between the male projection 17 and the female projection 20 formed by continuously forming a crest and a trough in the circumferential direction in a wavy manner. Since the engagement between the plate 19 and the holder cylinder 22 is achieved by the engagement between the pair of rotation stop plate portions 21 and the pair of longitudinal grooves 24, the person who intends to illegally enter the manhole grasps the rotor 16 with any tool. Even if it tries to rotate, the load external force works evenly distributed, so the resistance to mechanical destruction is large and it becomes strong against unauthorized unlocking.
On the other hand, since the engagement between the key 6 and the rotor 16 is made by the engagement between the male projection 17 and the female projection 29 formed by continuously forming a crest and a trough in the circumferential direction , the key The authorized manager of the manhole having 6 can apply a sufficiently large rotational driving force to the rotor 16.
Further, since the engagement between the key 6 and the cylindrical casing 15 is made by the engagement of the four inward projections 23 of the holder cylinder 22 and the circumferential groove 30 of the key 6, the cylindrical casing 15 is sufficiently engaged. A large traction force can be applied uniformly along the circumferential direction, and the extraction operation of the second lock unit 5 is performed lightly and smoothly.
[Brief description of the drawings]
FIG. 1 is a plan view of a manhole cover locking device in use according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the lid locking device of FIG. 1 in a locked state.
3 is a longitudinal sectional view of the lid locking device of FIG. 2 when a stopper member and a cap are removed.
4 is a longitudinal sectional view showing a state in which the key of the second lock unit is inserted in the lid locking device of FIG. 3; FIG.
5 is a longitudinal sectional view of the lid locking device of FIG. 4 with the second lock unit removed. FIG.
6 is a longitudinal sectional view showing a state in which the key of the first lock unit is inserted in the lid locking device of FIG. 5. FIG.
7 is a plan view of the lid locking device of FIG. 3 when illustration of a plug member and a cap is omitted.
8 is a cross-sectional view taken along line AA in FIG.
9 is a cross-sectional view taken along line BB in FIG.
10 is a cross-sectional view taken along the line CC of FIG.
11 is a bottom view of a second lock unit used in the lid locking device of FIG. 2; FIG.
12 is a longitudinal sectional view of a disassembled state of a cylindrical casing, a holder cylinder, a rotor, a locking plate, a retaining ring, and a locking plate of a second lock unit used in the lid locking device of FIG. 2;
13 is a plan view of the cylindrical casing of FIG. 12. FIG.
14 is a bottom view of the cylindrical casing of FIG.
15 is a cross-sectional view taken along the line DD of FIG.
FIG. 16 is a plan view of the holder tube of FIG.
FIG. 17 is a bottom view of the holder tube of FIG. 15;
18 is a plan view of the rotor of FIG. 12. FIG.
19 is a cross-sectional view taken along the line EE of FIG.
20 is a bottom view of the rotor of FIG. 19. FIG.
21 is a plan view of the locking plate of FIG.
22 is a front view of the key of the second lock unit used in the lid locking device of FIG. 2; FIG.
FIG. 23 is a right side view of the key part of FIG. 22 cut longitudinally.
24 is a bottom end face of the key of FIG. 22;
25 is a front view of a key of the first lock unit used in the lid locking device of FIG. 2; FIG.
26 is a cross-sectional view taken along line FF in FIG. 25. FIG.
27 is a longitudinal sectional view showing a state in which the key of the second lock unit is pressed down in the lid locking device of FIG. 2; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lid 2 Fixed receiving frame 3 1st lock unit 4 Key passage 5 2nd lock unit 6 Key of 2nd lock unit 7 Key of 1st lock unit 8 Bar-shaped housing 9 Center shaft hole 10 Locking shaft 11 Receipt of fixed receiving frame side Part 12 Stopper plate 13 Key receiving part 14 Key code part 15 Cylindrical casing 16 Rotor 17 Male protrusion 18 Reduced diameter part 19 Locking plate 20 Female protrusion 21 Rotation stopping plate part 22 Holder cylinder 23 Inward protrusion 24 Vertical groove 25 Spring member 26 Locking groove 27 Lock plate 28 Female projection 29 Axial groove 30 Circumferential groove

Claims

A first lock unit 3 that is installed on the lid 1 side and locks the lid 1 in a closed position with respect to the fixed receiving frame 2 of the manhole, and is inserted into the key passage 4 of the first lock unit 3, The second lock unit 5 is restrained so that it cannot be pulled out. After the second lock unit 5 is pulled out by the key 6 of the second lock unit 5, the lid 1 for the fixed receiving frame 2 is pulled by the key 7 of the first lock unit 3. The lock is released ,
The first lock unit 3 mounted on the lower portion of the rod-shaped housing 8 that passes through the lid 1 in the vertical direction and is fixed to the lid 1 is a locking shaft that is rotatably accommodated in the central shaft hole 9 of the rod-shaped housing 8. 10 and a stopper plate 12 fixed to the lower end portion of the locking shaft 10 and engaged with the receiving portion 11 on the fixed receiving frame 2 side. The key 7 of the first lock unit 3 has an upper end of the locking shaft 10. A key code part 14 to be inserted into the key receiving part 13 formed in the part is formed at the tip part,
The second lock unit 5 mounted on the upper portion of the rod-shaped housing 8 is a cylindrical casing 15 inserted into the key passage 4 of the first lock unit 3, and the cylindrical casing 15 is rotatable and vertically movable. are incapable of accommodating, to form a male projection 17 on the upper end portion outer peripheral surface, the rotor 16 forming a reduced diameter portion 18 obtained by reducing the diameter under the valley diameter or less of the male collision force 17 on the lower side of the male protrusions 17 A female projection 20 corresponding to the male projection 17 of the rotor 16 is formed on the inner peripheral surface, and a locking plate 19 having a rotation stopper plate portion 21 formed on the outer peripheral surface; A spring member 25 that pushes up and biases the locking plate 19; a lock plate 27 that is fixed to the lower end portion of the rotor 16 and that engages and disengages in a locking groove 26 formed on the inner peripheral surface of the rod-shaped housing 8; Consists of
The key 6 of the second lock unit 5 has a female projection 28 formed on the inner peripheral surface of the cylinder portion that coincides with the male projection 17 of the rotor 16, and when the rotor 16 is rotated by a predetermined angle by the key 6. The locking device for a manhole cover in which the lock plate 27 escapes from the locking groove 26 and fits within the outer peripheral contour of the cylindrical casing 15.
The holder cylinder 22 is fitted and fixed to the upper half of the cylindrical casing 15, four inward projections 23 are formed at equal intervals on the upper end of the holder cylinder 22, and a pair of vertical grooves 24 are formed on the lower side wall of the holder cylinder 22. Formed on the outer peripheral surface of the cylindrical portion of the key 6 are four axial grooves 29 that coincide with the inward projections 23 of the holder cylinder 22 and circumferential grooves that intersect the upper ends of the axial grooves 29. 30, the male projection 17 of the rotor 16 is formed by continuously forming peaks and valleys in a circumferential shape in the circumferential direction, and the female projection 20 of the locking plate 19 is circumferential. A crest portion and a trough portion are continuously formed in a wave shape, the rotation stop plate portion 21 of the lock plate 19 is formed in a pair, and the female projection 28 of the key 6 of the second lock unit 5 is formed. The crest and trough are continuously formed in a wave shape in the circumferential direction,
The engagement between the rotor 16 and the locking plate 19 is achieved by the engagement between the male projection 17 and the female projection 20, and the engagement between the locking plate 19 and the holder cylinder 22 is the rotation stopping plate. Engagement of the key 21 and the rotor 16 of the second lock unit 5 is achieved by engagement of the female projection 29 and the male projection 17. The locking for the manhole cover is characterized in that the engagement between the key 6 and the cylindrical casing 15 of the second lock unit 5 is achieved by the engagement between the inward projection 23 and the circumferential groove 30. apparatus.