JP5385934B2

JP5385934B2 - Locking device for keyhole of manhole cover

Info

Publication number: JP5385934B2
Application number: JP2011084932A
Authority: JP
Inventors: 修小山; 健一須田; 拓也北本
Original assignee: Takigen Manufacturing Co Ltd
Current assignee: Takigen Manufacturing Co Ltd
Priority date: 2011-04-06
Filing date: 2011-04-06
Publication date: 2014-01-08
Anticipated expiration: 2031-04-06
Also published as: JP2012219478A; KR101257718B1; KR20120114135A

Description

この発明は、マンホール蓋の鍵孔を不使用時に閉塞して施錠することにより、無権限者によるマンホール蓋の開放行為を防止する鍵孔用閉塞栓錠装置に関する。 The present invention relates to a keyhole closing and locking device that prevents an unauthorized person from opening the manhole cover by closing and locking the keyhole of the manhole cover when not in use.

地下敷設管路などの点検修理のためにマンホールの蓋を開放する際には、マンホール蓋に設けられた鍵孔に棒状手鍵のＴ字状先端部を挿入し、これを鍵孔の下面縁部に係合させ、マンホール蓋を引き起こし開放する。無権限者がマンホール蓋を開放するのを防止する手段としては、特許文献１に開示されたマンホール蓋の鍵孔用盲栓装置が知られている。
この装置は、本体と主軸と締め付けナットとで構成される。本体上部の円盤部の裏面には、マンホール蓋の上面部の位置決め用凹部に嵌合される位置決め用突起が設けられる。本体の下部は円筒状で、マンホール蓋の鍵孔に挿入される。本体には、中心部の上部から下部に連通して大径軸孔と小径軸孔が設けられる。本体の筒状部には、相対向する順回転時規制面と逆回転時規制面とを有する割り溝が設けられる。主軸の上部は、本体の大径軸孔に相対回転自在に受け入れられる。主軸の上端には、操作ハンドルの駆動用端部が係脱する受動用端部が設けられる。受動用端部の下部側には小径軸孔より大径の抜け止め用フランジが設けられる。抜け止め用フランジの下部側には、小径軸孔に嵌挿される雄螺子棒が設けられる。締め付けナットは、主軸の雄螺子棒に螺合される。締め付けナットの上部には、鍵孔の逃げ孔部を通過できる固定用爪が張り出す。固定用爪は、マンホール蓋の下面部に接離する。主軸を順回転させると、固定用爪が割溝の順回転時規制面に当接するまで締め付けナットが主軸と共回りし、当接後は主軸に沿って相対的に上昇し、また、逆回転させると、固定用爪が割溝の逆回転時規制面に当接するまで主軸と共回りし、当接後は主軸に沿って相対的に下降する。装置の下部をマンホール蓋の鍵孔に挿入し、特殊な操作ハンドルを主軸上端に係合させ、順方向に回転させることにより、締め付けナットを相対的に上昇させ、マンホール蓋の下面に当接させると、装置は鍵孔に対して抜け止めされる。主軸を逆回転させれば、ナットが下降して装置を回転させることができるから、ナットの位置を鍵孔に適合させて装置を鍵孔から引き抜くことができる。操作ハンドルがなければ主軸を順方向へも逆方向へも回転操作することができない。 When opening the manhole cover for inspection and repair of underground laying pipes, etc., insert the T-shaped tip of the bar-shaped hand key into the keyhole provided in the manhole cover, and insert this into the bottom edge of the keyhole Engage with the part to raise and open the manhole cover. As a means for preventing an unauthorized person from opening the manhole cover, a manhole cover key plug device disclosed in Patent Document 1 is known.
This device includes a main body, a main shaft, and a tightening nut. On the back surface of the disk portion at the top of the main body, positioning protrusions that are fitted into the positioning recesses on the upper surface portion of the manhole cover are provided. The lower part of the main body is cylindrical and is inserted into the keyhole of the manhole cover. The main body is provided with a large-diameter shaft hole and a small-diameter shaft hole communicating from the upper part to the lower part of the central part. The cylindrical portion of the main body is provided with a split groove having a forward rotation restricting surface and a reverse rotation restricting surface facing each other. The upper part of the main shaft is received in the large-diameter shaft hole of the main body so as to be relatively rotatable. At the upper end of the main shaft, there is provided a passive end portion that engages and disengages the driving end portion of the operation handle. On the lower side of the passive end, a retaining flange having a larger diameter than the small diameter shaft hole is provided. A male screw rod fitted into the small diameter shaft hole is provided on the lower side of the retaining flange. The tightening nut is screwed onto the male screw rod of the main shaft. On the upper part of the tightening nut, a fixing claw that can pass through the escape hole of the key hole projects. The fixing claw contacts and separates from the lower surface of the manhole cover. When the main shaft is rotated forward, the tightening nut rotates together with the main shaft until the fixing claw contacts the regulating surface during forward rotation of the split groove, and after contact, the nut rises relatively along the main shaft and rotates backward. If it does, it will rotate with a main axis | shaft until a fixing nail | claw will contact | abut to the regulation surface at the time of reverse rotation of a dividing groove, and will descend | fall relatively along a main axis | shaft after contact. Insert the lower part of the device into the keyhole of the manhole cover, engage the special operation handle with the upper end of the main shaft, and rotate it in the forward direction to relatively raise the tightening nut and bring it into contact with the lower surface of the manhole cover Then, the device is secured against the keyhole. If the main shaft is rotated in the reverse direction, the nut can be lowered and the apparatus can be rotated. Therefore, the position of the nut can be adapted to the key hole and the apparatus can be pulled out from the key hole. Without the operation handle, the spindle cannot be rotated in the forward or reverse direction.

特開平１０−２０５１８４号公報Japanese Patent Laid-Open No. 10-205184

上記従来の装置においては、操作ハンドル以外の工具を用いても、比較的容易に主軸を回転させることができ、装置を鍵孔から抜き取ることができる。鍵孔に適宜の工具を掛けて引き上げれば、無権限者が容易にマンホール蓋を開くことができる。
したがって、この出願に係る発明の目的は、マンホール蓋の鍵孔を閉塞して施錠することができる防犯効果の高い鍵孔用閉塞栓錠装置を提供することである。本発明の他の目的は、施錠操作は適正なキーを用いずに適宜の代用工具を用いても行うことができるが、解錠操作は適正なキーを用いなければ行うことができない使い勝手のよいマンホール蓋の鍵孔用閉塞栓錠装置を提供することである。 In the above-described conventional apparatus, even if a tool other than the operation handle is used, the spindle can be rotated relatively easily, and the apparatus can be removed from the keyhole. An unauthorized person can easily open the manhole cover by pulling the keyhole with an appropriate tool.
Accordingly, an object of the invention according to this application is to provide a keyhole closing and locking device with a high crime prevention effect that can lock the keyhole of a manhole cover. Another object of the present invention is that the locking operation can be performed using an appropriate substitute tool without using an appropriate key, but the unlocking operation cannot be performed unless an appropriate key is used. An object of the present invention is to provide a closure plug device for a keyhole of a manhole cover.

以下、添付図面の符号を参照して説明するが、本発明はこれに限定されるものではない。
上記課題を解決するための、この出願に係る発明のマンホール蓋の鍵孔閉塞栓錠装置１は、マンホール蓋５１の鍵孔５２に挿入され、鍵孔５２を閉塞した状態で抜き取り不可能に施錠される閉塞栓２と、これを施解錠するためのキー３とを具備する。閉塞栓２は、本体４と、一対のストッパ杆５と、ロータ６と、ロータ６に保持されるリテーナディスク７、第１及び第２コードディスク８，９、サイドバー１０と、締め付けナット部材１１とを具備する。本体４は、円盤部１２とハウジング部１３とを有する。ストッパ杆５は、ハウジング部１３から下方へ延出する。ロータ６は、シリンダ部１５とねじ棒部１６とを有する。リテーナディスク７、第１コードディスク８、第２コードディスク９及びサイドバー１０は、ロータ６のシリンダ部１５内に保持され、キー３で回転操作される。締め付けナット部材１１は、ロータ６のねじ棒部１６に螺合される。円盤部１２は、中央にキーを挿入するための開口１２ｂを備え、下面がマンホール蓋５１の上面に当接する。ハウジング部１３は、円盤部１２の下面から、これと同心に下方へ延出し、マンホール蓋５１の鍵孔５２に挿入可能であり、内側に円盤部１２の開口１２ｂより内径の大きな円筒空間１３ａを有すると共に、内周に軸方向に延びるロック溝１３ｂを有し、円筒空間１３ａより小径の開口１４ａを有する蓋１４で下端が閉塞される。一対のストッパ杆５は、ハウジング部１３の下端周縁部の半径方向対向位置から軸方向に下方へ延出し、それぞれ右回転規制面５ａと左回転規制面５ｂを有する。ロータ６のシリンダ部１５は、上端が開放し、下端が開口１８ａを有する下端壁１８で閉塞され、回転軸線を中心に相対回転自在にハウジング部１３内に収容される。シリンダ部１５の側壁１７には、軸方向のスリット１７ａと、回転方向左右に対向する左回転受動面１７ｃと右回転受動面１７ｄとを持つ切欠き部１７ｂとが形成される。ロータ６のねじ棒部１６は、シリンダ部１５の開口１８ａに連通する貫通孔１６ａを有し、シリンダ部１５の下端壁１８の中央から下方へ軸方向に延出して、ハウジング部蓋１４の開口１４ａを相対回転自在に貫通する。リテーナディスク７は、ロータ６のシリンダ部１５内の上端部に回転軸線を中心に相対回転自在に収容され、シリンダ部１５の内径と同径の円形基本外周を持ち、中央に鍵挿入開口７ａを有し、基本外周の互いに９０°離れた位置に、第１、第２の2つの凹部７ｂ，７ｃを有すると共に、２つの凹部７ｂ，７ｃ間に、基本外周からなるロック部７ｄを有する。第１及び第２コードディスク８，９は、それぞれリテーナディスク７の下に直接または間接に重ねて配置され、リテーナディスク７と同径の円形基本外周を持ち、中央に互いに異なる形状の鍵挿入開口８ａ，９ａを有すると共に、基本外周の互いに４５°離れた位置に、第１、第２の2つの凹部８ｂ，９ｂを有すると共に、第１の凹部８ｂ，９ｂから左回転に１３５°離れた位置に、シリンダ部１５の切欠き部１７ｂ内へ突出する駆動凸部８ｄ，９ｄを有し、当該駆動凸部８ｄ，９ｄがシリンダ部１５の切り欠き部１７ｂ内で相対回転を許容される４５°の範囲でロータ６のシリンダ部１５内において回転軸線を中心に相対回転自在である。サイドバー１０は、シリンダ部１５のスリット１７ａ内に保持され、ハウジング部１３のロック溝１３ｂに落ち込んだ外方位置とコードディスク８及びリテーナディスク７の凹部７ｂ，７ｃ，８ｂ，８ｃ，９ｂ，９ｃに落ち込んだ内方位置との間をシリンダ部１５の半径方向に移動自在で、常時はシリンダ部１５と共にハウジング部１３内を回転移動自在であるが、リテーナディスク７のロック部７ｄに当接してロック溝１３ｂに落ち込んだとき、ロータ６がハウジング部１３内で相対回転することを妨げる。締め付けナット部材１１は、マンホール蓋５１の鍵孔５２に対して所定の回転角度位置において当該鍵孔５２を通過するが、他の回転角度位置では通過不可能な外形をなし、ねじ棒１６に螺合され、マンホール蓋５１の下面下にあって、ねじ棒１６の右回転時にストッパ杆５の右回転規制面５ａに当接することにより本体４に対して相対的に上昇して円盤部１２との間でマンホール蓋５１を締め付け、ねじ棒１６の左回転時にはストッパ杆５の左回転規制面５ｂに当接することにより本体４に対して相対的に下降してマンホール蓋５１を解放する。キー３は、軸線方向に延びる平行２つの基本側面３ｂを持つ軸体３ａの第１コードディスク８に対応する位置に、当該基本側面３ｂに対して４５°回転した平行２つの左回転駆動面３ｃを持つコード溝３ｄを有する。リテーナディスク７の鍵挿入開口７ａは、キー３の軸体３ａの横断面に対応する形状で、当該軸体３ａの基本側面３ｂに対応する平行側面が第１及び第２の凹部７ｂ，７ｃに対して４５°の回転角度をなして形成される。第１コードディスク８の鍵挿入開口８ａは、キー３の軸体３ａの横断面に対応する形状で、当該軸体３ａの基本側面３ｂに対応する平行側面を駆動凸部８ｄの突出方向に対して直交方向に向けて形成される。第２コードディスク９の鍵挿入開口９ａは、キー３の軸体３ａの横断面形状を４５°回転させた軌跡に対応する形状で、駆動凸部９ｄの突出方向に対して直交方向の２つの平行側面からなる右回転受動面９ｅと、これに対して左方向へ４５°回転した２つの平行側面からなる左回転受動面９ｆを有する形状に形成される。リテーナディスク７の第１の凹部７ｂ、２つのコードディスク８，９の第１の凹部８ｂ，９ｂ及びサイドバー１０を保持するロータ６のスリット１７ａが、ハウジング部１３のロック溝１３ｂに対向し、２つのコードディスク８，９の駆動凸部８ｄ，９ｄがロータの切り欠き１７ｂの右回転受動面１７ｄに当接し、かつナット部材１１が、ストッパ杆５の右回転規制面５ａに当接するようにリテーナディスク７、コードディスク８，９、ロータ６及びナット部材１１が整列した状態が鍵抜き差し位置として設定される。それによって、鍵抜き差し位置からのロータ６の右回転、すなわちナット部材１１の締め付けは、各部材の整列状態を崩すことなくコードディスク８の鍵挿入開口８ａに差し込まれる不特定の操作部材により可能とされるが、ロータ６の左回転、すなわちナット部材１１の緩めは、キー２による操作のみによって可能とされる。 Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, the manhole cover keyhole closure device 1 of the invention according to this application is inserted into the keyhole 52 of the manhole cover 51 and locked in a state where the keyhole 52 is closed and cannot be removed. And a key 3 for locking and unlocking the plug. The closing plug 2 includes a main body 4, a pair of stopper rods 5, a rotor 6, a retainer disk 7 held by the rotor 6, first and second code disks 8 and 9, a side bar 10, and a tightening nut member 11. It comprises. The main body 4 has a disk part 12 and a housing part 13. The stopper rod 5 extends downward from the housing portion 13. The rotor 6 has a cylinder portion 15 and a screw rod portion 16. The retainer disk 7, the first code disk 8, the second code disk 9, and the side bar 10 are held in the cylinder portion 15 of the rotor 6 and are rotated by the key 3. The tightening nut member 11 is screwed into the threaded rod portion 16 of the rotor 6. The disk portion 12 includes an opening 12 b for inserting a key in the center, and the lower surface abuts on the upper surface of the manhole cover 51. The housing part 13 extends downward from the lower surface of the disk part 12 concentrically therewith, and can be inserted into the keyhole 52 of the manhole cover 51. A cylindrical space 13a having a larger inner diameter than the opening 12b of the disk part 12 is formed inside. The lower end is closed by a lid 14 having a lock groove 13b extending in the axial direction on the inner periphery and having an opening 14a having a smaller diameter than the cylindrical space 13a. The pair of stopper rods 5 extends downward in the axial direction from the radially opposed position of the lower peripheral edge of the housing portion 13 and has a right rotation restriction surface 5a and a left rotation restriction surface 5b, respectively. The cylinder portion 15 of the rotor 6 is closed at the lower end wall 18 having an open upper end and a lower end having an opening 18a, and is accommodated in the housing portion 13 so as to be relatively rotatable about the rotation axis. The side wall 17 of the cylinder portion 15 is formed with an axial slit 17a and a notch portion 17b having a left rotation passive surface 17c and a right rotation passive surface 17d that are opposed to the left and right in the rotation direction. The threaded rod portion 16 of the rotor 6 has a through hole 16 a communicating with the opening 18 a of the cylinder portion 15, extends in the axial direction downward from the center of the lower end wall 18 of the cylinder portion 15, and opens the housing portion lid 14. 14a is penetrated so that relative rotation is possible. The retainer disk 7 is housed in the upper end portion of the cylinder portion 15 of the rotor 6 so as to be relatively rotatable about a rotation axis, has a circular basic outer periphery having the same diameter as the inner diameter of the cylinder portion 15, and has a key insertion opening 7a in the center. The first and second recesses 7b and 7c are provided at positions 90 ° apart from each other on the basic outer periphery, and a lock portion 7d having a basic outer periphery is provided between the two recesses 7b and 7c. The first and second code discs 8 and 9 are arranged directly or indirectly under the retainer disc 7, respectively, and have a circular basic outer periphery with the same diameter as the retainer disc 7, and different key insertion openings in the center. 8a and 9a, and the first outer periphery and the second recesses 8b and 9b at positions 45 ° apart from each other on the basic outer periphery, and a position 135 ° away from the first recesses 8b and 9b by counterclockwise rotation. The drive projections 8d and 9d project into the cutout portion 17b of the cylinder portion 15, and the drive projection portions 8d and 9d are allowed to rotate relatively within the cutout portion 17b of the cylinder portion 15 at 45 °. In this range, relative rotation is possible about the rotation axis within the cylinder portion 15 of the rotor 6. The side bar 10 is held in the slit 17a of the cylinder portion 15 and is moved outwardly into the lock groove 13b of the housing portion 13 and the concave portions 7b, 7c, 8b, 8c, 9b, 9c of the code disk 8 and the retainer disk 7. Is movable in the radial direction of the cylinder portion 15 between the inner position and the inner position where the cylinder portion 15 is depressed, and is normally rotatable in the housing portion 13 together with the cylinder portion 15, but is in contact with the lock portion 7 d of the retainer disk 7. When falling into the lock groove 13b, the rotor 6 is prevented from relatively rotating in the housing portion 13. The tightening nut member 11 passes through the key hole 52 at a predetermined rotation angle position with respect to the key hole 52 of the manhole cover 51, but has an outer shape that cannot pass at other rotation angle positions. The lower part of the manhole cover 51 is below the lower surface of the manhole cover 51. When the screw rod 16 rotates clockwise, it comes into contact with the right rotation restricting surface 5a of the stopper rod 5 and rises relative to the main body 4 to The manhole cover 51 is tightened between them, and when the screw rod 16 is rotated counterclockwise, the manhole cover 51 is lowered relative to the main body 4 by coming into contact with the left rotation restricting surface 5b of the stopper rod 5 to release the manhole cover 51. The key 3 has two parallel left-rotation drive surfaces 3c rotated by 45 ° with respect to the basic side surface 3b at a position corresponding to the first code disk 8 of the shaft body 3a having two basic side surfaces 3b extending in the axial direction. A cord groove 3d having The key insertion opening 7a of the retainer disk 7 has a shape corresponding to the cross section of the shaft body 3a of the key 3, and the parallel side surface corresponding to the basic side surface 3b of the shaft body 3a is formed in the first and second recesses 7b and 7c. In contrast, it is formed with a rotation angle of 45 °. The key insertion opening 8a of the first code disk 8 has a shape corresponding to the cross section of the shaft body 3a of the key 3, and a parallel side surface corresponding to the basic side surface 3b of the shaft body 3a with respect to the projecting direction of the drive protrusion 8d. And formed in the orthogonal direction. The key insertion opening 9a of the second code disk 9 has a shape corresponding to a trajectory obtained by rotating the cross-sectional shape of the shaft 3a of the key 3 by 45 °, and is perpendicular to the projecting direction of the drive convex portion 9d. It is formed into a shape having a right-turning passive surface 9e consisting of parallel side surfaces and a left-turning passive surface 9f consisting of two parallel side surfaces rotated 45 ° to the left with respect to this. The first recess 7b of the retainer disk 7, the first recesses 8b, 9b of the two code disks 8, 9 and the slit 17a of the rotor 6 that holds the sidebar 10 are opposed to the lock groove 13b of the housing part 13, The drive projections 8d and 9d of the two code disks 8 and 9 are in contact with the right rotation passive surface 17d of the rotor notch 17b, and the nut member 11 is in contact with the right rotation restriction surface 5a of the stopper rod 5. The state in which the retainer disk 7, the code disks 8, 9, the rotor 6 and the nut member 11 are aligned is set as the key insertion / removal position. Thereby, the right rotation of the rotor 6 from the key insertion / removal position, that is, the tightening of the nut member 11 can be performed by an unspecified operation member inserted into the key insertion opening 8a of the code disk 8 without breaking the alignment state of each member. However, the left rotation of the rotor 6, that is, the loosening of the nut member 11 can be performed only by the operation with the key 2.

この出願に係る発明の装置によれば、マンホール蓋の鍵孔を閉塞して施錠することができる防犯効果の高い鍵孔閉塞栓錠装置を提供することができる。また施錠操作は適正なキーを用いずに汎用の代用工具を用いても行うことができるが、解錠操作は適正なキーを用いなければ行うことができない使い勝手のよいマンホール蓋の鍵孔閉塞栓錠装置を提供することができる。 According to the device of the invention relating to this application, it is possible to provide a keyhole closing and locking device with a high crime prevention effect capable of closing and locking the keyhole of the manhole cover. The locking operation can be performed using a general-purpose substitute tool without using an appropriate key, but the unlocking operation cannot be performed without using an appropriate key. A locking device can be provided.

本発明の実施形態に係るマンホール蓋の鍵孔用閉塞栓錠装置の正面図である。It is a front view of the obstruction locking device for keyholes of a manhole cover concerning an embodiment of the present invention. 図１の鍵孔用閉塞栓錠装置における閉塞栓の側面図である。It is a side view of the obstruction | occlusion stopper in the obstruction | occlusion stopper locking device for key holes of FIG. 図１の鍵孔用閉塞栓錠装置における閉塞栓の平面図である。It is a top view of the closure plug in the closure plug device for key holes of Drawing 1. 図１の閉塞栓錠装置の底面図である。FIG. 2 is a bottom view of the obturator plug device of FIG. 1. 図１の閉塞栓錠装置の断面図である。It is sectional drawing of the obstruction | occlusion plug device of FIG. （A）は図１の閉塞栓錠装置における閉塞栓本体の断面図、（B）は同底面図である。(A) is sectional drawing of the obstruction | occlusion stopper main body in the obstruction | occlusion stopper locking device of FIG. 1, (B) is the bottom view. （A）は図１の閉塞栓錠装置におけるロータ正面図、（B）は同平面図、（C）は同断面図である。(A) is a front view of the rotor in the obturator plug device of FIG. 1, (B) is a plan view thereof, and (C) is a sectional view thereof. （A）は図１のVIIIA−VIIIA断面図、（B）はVIIIB−VIIIB断面図である。(A) is VIIIA-VIIIA sectional drawing of FIG. 1, (B) is VIIIB-VIIIB sectional drawing. 図１の閉塞栓におけるフロントディスクの上面に沿った横断平面図である。It is a cross-sectional top view along the upper surface of the front disk in the obstruction | occlusion stopper of FIG. 図５の閉塞栓におけるリテーナディスクの上面に沿った横断平面図である。FIG. 6 is a cross-sectional plan view along the upper surface of the retainer disk in the closure plug of FIG. 5. 図５の閉塞栓における第１コードディスクの上面に沿った横断平面図である。FIG. 6 is a cross-sectional plan view along the upper surface of the first code disk in the closure plug of FIG. 5. 図５の閉塞栓における第２コードディスクの上面に沿った横断平面図である。FIG. 6 is a cross-sectional plan view along the upper surface of a second code disk in the closure plug of FIG. 5. 図１の閉塞栓錠装置を非正規キーで右回転操作するときの各部の動作を順を追って説明する各部の断面図である。It is sectional drawing of each part explaining the operation | movement of each part at the time of carrying out clockwise rotation operation of the obstruction | occlusion stopper device of FIG. 図１の閉塞栓錠装置を非正規キーで左回転操作するときの各部の動作を順を追って説明する各部の断面図である。It is sectional drawing of each part explaining the operation | movement of each part at the time of carrying out the left rotation operation of the obstruction | occlusion stopper device of FIG. 図１の閉塞栓錠装置を正規キーで左回転操作するときの各部の動作を（Ａ）、（Ｂ）の順を追って説明する各部の断面図である。It is sectional drawing of each part explaining operation | movement of each part at the time of carrying out the left rotation operation of the obstruction | occlusion stopper locking device of FIG. 1 with a regular key in order of (A) and (B). 図１５に続く各部の動作を（Ｃ）、（Ｄ）の順を追って説明する各部の断面図である。It is sectional drawing of each part explaining operation | movement of each part following FIG. 15 in order of (C) and (D). 図１６に続く各部の動作を（Ｅ）、（Ｆ）の順を追って説明する各部の断面図である。It is sectional drawing of each part explaining operation | movement of each part following FIG. 16 in order of (E) and (F). 図１７に続く各部の動作を（Ｇ）、（Ｈ）の順を追って説明する各部の断面図である。It is sectional drawing of each part explaining the operation | movement of each part following FIG. 17 in order of (G) and (H).

図面を参照してこの発明の実施の形態を説明する。
図１ないし図５に示すように、マンホール蓋の鍵孔用閉塞栓錠装置１は、マンホール蓋５１の鍵孔５２に挿入され、鍵孔５２を閉塞した状態で抜き取り不可能に施錠される閉塞栓２と、これを施解錠するためのキー３とを具備する。
閉塞栓２は、本体４、ストッパ杆５、ロータ６、リテーナディスク７、第１及び第２コードディスク８，９、サイドバー１０及びナット部材１１を具備する。
閉塞栓本体４は、円盤部１２とハウジング部１３とを有する。円盤部１２は、マンホール蓋５１の上面部に形成される位置決め用凹部５３に嵌合される位置決め用突起１２ａを下面に備えると共に、中央にキー３を挿入するための開口１２ｂを備え、下面がマンホール蓋５１の上面に当接する。１２ｃは、鍵抜き差し位置表示である。
図６に示すように、閉塞栓本体４のハウジング部１３は、筒状で、円盤部１２の下面から、これと同心に下方へ延出し、マンホール蓋５１の鍵孔５２に挿入可能である。ハウジング部１３の内側には、円盤部１２の開口１２ｂより内径の大きな円筒空間１３ａが形成され、内周には、軸方向に延びるロック溝１３ｂが形成される。図５に示すように、ハウジング部１３の下端は、円筒空間１３ａより小径の開口１４ａを有する蓋１４で閉塞される。
図１，２，４に示すように、一対のストッパ杆５は、ハウジング部１３の下端周縁部の半径方向対向位置から軸方向に下方へ延出し、それぞれ右回転規制面５ａと左回転規制面５ｂを有する。
図５に示すように、ロータ６は、回転軸線を中心に相対回転自在にハウジング部１３内に収容されるシリンダ部１５と、それから下方へ延出するねじ棒部１６とを有する。シリンダ部１５の上端と円盤部１２の開口１２ｂの縁部との間には、フロントディスク１９が回転軸線を中心に相対回転自在に介設される。図９に示すように、フロントディスク１９は、円盤状で、中央に鍵挿入用開口１９ａを有する
図７に示すように、シリンダ部１５は、上端が開放し、下端が開口１８ａを有する下端壁１８で閉塞される。筒状の側壁１７には、軸方向のスリット１７ａと、切欠き部１７ｂが形成される。切欠き部１７ｂは、側壁１７の円周方向左右に対向する左回転受動面１７ｃと右回転受動面１７ｄとを有する。
ねじ棒部１６は、シリンダ部１５の下端壁１８の開口１８ａに連通する貫通孔１６ａを有し、下端壁１８の中央から下方へ軸方向に延出し、ハウジング部１３の開口１４ａを相対回転自在に貫通する。
図５に示すように、キー３で回転操作される４つのリテーナディスク７、２つの第１コードディスク８及び３つの第２コードディスク９が、シリンダ部１５内に、それぞれ回転軸線を中心に相対回転自在に積層して収容される。積層順は、上方から、リテーナディスク７−第２コードディスク９−第１コードディスク８−リテーナディスク７−第２コードディスク９−リテーナディスク７−第１コードディスク８−リテーナディスク７−第２コードディスク９の順である。
図１０に示すように、４つのリテーナディスク７は同一形状で、それの１つは、シリンダ部１５内の上端部に収容される。リテーナディスク７は、中央の鍵挿入開口７ａと、外周の第１、第２の凹部７ｂ、７ｃ及びその間のロック部７ｄとを具備する。すなわち、リテーナディスク７は、シリンダ部１５の内径と同径の円形基本外周を持ち、基本外周の互いに９０°離れた位置に、第１、第２の2つの凹部７ｂ、７ｃが形成され、２つの凹部７ｂ、７ｃ間に、基本外周からなるロック部７ｄが形成される。
図１１に示すように、2枚の第１コードディスク８は、同一形状である。第１コードディスク８は、中央に鍵挿入開口８ａを有し、リテーナディスク７と同径の円形基本外周を持つ。外周には、第１、第２の凹部８ｂ、８ｃと、駆動凸部８ｄとが形成される。第１、第２の2つの凹部８ｂ、８ｃは、基本外周の互いに４５°離れた位置に形成され、駆動凸部８ｄは、第１の凹部８ｂから左回転に１３５°離れた位置に形成される。駆動凸部８ｄは、シリンダ部１５の切欠き部１７ｂ内へ突出する。したがって、第１コードディスク８は、駆動凸部８ｄが切り欠き部１７ｂ内で相対回転を許容される４５°の範囲で、ロータ６のシリンダ部１５内において回転軸線を中心に相対回転自在である。
図１２に示すように、3枚の第２コードディスク９は、いずれも同一形状で、それの一つがリテーナディスク７の下に重ねて配置される。第２コードディスク９は、中央に鍵挿入開口９ａを有し、リテーナディスク７と同径の円形基本外周を持つ。外周には、第１、第２の凹部９ｂ、９ｃと、駆動凸部９ｄとを具備する。第１、第２の2つの凹部９ｂ、９ｃは、基本外周の互いに４５°離れた位置に形成される。駆動凸部９ｄは、第１の凹部９ｂから左回転に１３５°離れた位置に、基本外周から半径方向外側へ突出するように設けられる。駆動凸部９ｄは、シリンダ部１５の切欠き部１７ｂ内へ突出する。したがって、第２コードディスク９は、駆動凸部９ｄが切り欠き部１７ｂ内で相対回転を許容される４５°の範囲で、ロータ６のシリンダ部１５内において回転軸線を中心に相対回転自在である。
図５に示すように、最下方のコードディスク９とシリンダ部１５の端壁１８との間には、板ばね２０が介設され、ディスク７，８，９の相互間に適切な接触抵抗を付与する。
図１０〜１２に示すように、サイドバー１０は、シリンダ部１５のスリット１７ａ内に保持され、ハウジング部１３のロック溝１３ｂに落ち込んだ外方位置と、コードディスク８，９及びリテーナディスク７の凹部７ｂ，７ｃ，８ｂ，８ｃ，９ｂ，９ｃに落ち込んだ内方位置との間を、シリンダ部１５の半径方向に移動自在で、常時はシリンダ部１５と共にハウジング１３部内を回転移動自在であるが、図１４（Ｂ）に示すように、リテーナディスク７のロック部７ｄに当接してロック溝１３ｂに落ち込んだとき、ロータ６がハウジング部１３内で相対回転することを妨げる。
締め付けナット部材１１は、マンホール蓋５１の鍵孔５２に対して所定の回転角度位置において当該鍵孔５２を通過するが、他の回転角度位置では通過不可能な外形をなし、一対のストッパ杆５の間に位置してねじ棒部１６に螺合される。締め付けナット部材１１は、マンホール蓋５１の鍵孔５２に挿入された状態において、マンホール蓋５１の下面下にあり、ねじ棒部１６の右回転時に、ストッパ杆５の右回転規制面５ａ（図４）に当接することにより、ねじ棒部１６との供回りが規制され、本体４に対して相対的に上昇して円盤部１２との間でマンホール蓋５１を締め付け、ねじ棒１６の左回転時には、ストッパ杆５の左回転規制面５ｂ（図４）に当接することにより、本体４に対して相対的に下降してマンホール蓋５１を解放する。
一方、キー３は、図１、図８に示すように、軸線方向に延びる平行２つの基本側面３ｂを持つ軸体３ａの第１コードディスク８に対応する位置に、当該基本側面３ｂに対して４５°回転した平行２つの左回転駆動面３ｃを持つコード溝３ｄを有する。
図１０に示すように、キー３を受け入れるリテーナディスク７の鍵挿入開口７ａは、キー３の軸体３ａの基本横断面（図８（Ａ））に対応する形状で、当該軸体３ａの基本側面３ｂに対応する平行側面７ｅを有する。この平行側面７ｅは、第１及び第２の凹部７ｂ，７ｃに対してそれぞれ４５°の回転角度をなして形成される。
図１１に示すように、第１コードディスク８の鍵挿入開口８ａは、キー３の軸体３ａの基本横断面に対応する形状で、当該軸体３ａの基本側面３ｂに対応する平行側面８ｅを有する。平行側面８ｅは、駆動凸部８ｄの突出方向に対して直交方向に向けて形成される。
図１２に示すように、第２コードディスク９の鍵挿入開口９ａは、キーの軸体３ａの横断面形状（図８（Ａ））を軸周りに４５°回転させた軌跡に対応する形状で、駆動凸部９ｄの突出方向に対して直交方向の２つの平行側面からなる右回転受動面９ｅと、これに対して右方向へ４５°回転した２つの平行側面からなる左回転受動面９ｆを有する形状に形成される。
図１３（Ａ）、図１５（Ａ）に示すように、リテーナディスク７の第１の凹部７ｂ、２つのコードディスクの第１の凹部８ｂ，９ｂ及びサイドバー１０を保持するロータ６のスリット１７ａが、ハウジング部のロック溝１３ｂに対向し、２つのコードディスク８，９の駆動凸部８ｄ，９ｄが、ロータの切欠き１７ｂの右回転受動面１７ｄに当接し、かつナット部材１１が、ストッパ杆５の右回転規制面５ａに当接するようにリテーナディスク７、コードディスク８，９、ロータ６及びナット部材１１が整列した状態が鍵抜き差し位置として設定される。
いま、閉塞栓２がマンホール蓋５１の鍵孔５２に挿入された状態で、鍵抜き差し位置からロータ６を右回転、すなわちナット部材１１を締め付ける動作を、図１３を参照して説明する。ナット部材１１の締め付け操作（施錠操作）は、キー３を用いることなく、すなわち、鍵挿入開口１９ａ，７ａ，８ａ，９ａに挿入できるドライバーのような工具を用いても行うことができる。
ここでは、コード溝３ｃが形成されていない、キー３と同様の軸体のみの工具Ｔを用いて操作する例を説明する。図１３（Ａ）の鍵抜き差し位置に工具Ｔを挿入して右回転させる場合、少なくとも第１コードディスク８の鍵挿入開口８ａに軸体が挿入されていれば、第１コードディスク８が右回転し、それの駆動凸部８ｄがロータ６の右回転受動面１７ｄを押してロータ６を回転させる。ロータ６は、サイドバー１０を保持して、リテーナディスク７、第２コードディスク９と共に、それらの整列状態を維持したまま、ハウジング部１３内で右回転を継続することができる。ロータ６のねじ棒部１６が右回転すると、締め付けナット部材１１は、ストッパ杆５の右回転規制面５ａに当接していて右回転できないので、ねじ棒部１６に沿って相対的に上昇し、マンホール蓋５１の下面に当接することにより、円盤部１２との間でマンホール蓋５１を挟んでロックする。この状態では、閉塞栓２を鍵孔５２から抜き取ることができず、したがって、マンホール蓋５１を開放することができない。
これに対して、解錠操作（ナット部材１１を弛める操作）は、鍵抜き差し位置からロータ６を左回転させることにより行う。まず、この操作を、正規キー２でない工具Ｔを用いて行おうとする場合の動作を図１４を参照して説明する。図１４（Ａ）の位置から、工具Ｔを左回転させると、リテーナディスク７と第１コードディスク８が一体に回転するが、駆動凸部８ｄがロータ６の左回転受動面１７ｃに到達するまで（４５°左回転するまで）ロータ６は静止状態にある。ところが、リテーナディスク７が４５°回転すると、それのロック部７ｄがサイドバー１０を半径方向外側へ押して、ハウジング部１３のロック溝１３ｂ内に落とし込んで保持する。この状態では、ロータ６のスリット１７ａ内のサイドバー１０が内側へ逃げることができないので、ロータ６はロックされ左方向へ回転することができない。
このように、施錠操作は、キー３を用いることなく、すなわち、鍵挿入開口１９ａ，７ａ，８ａ，９ａに挿入できるドライバーのような工具を用いても行うことができるが、解錠操作はこのような工具では行うことができない。いったんマンホール蓋５１を外して、マンホール内での作業が終了した後は、キー３がなくても、作業員が鍵孔５２を閉塞したうえ、適宜の工具を用いて施錠することができるので、使い勝手が良好である。
次に、正規キー３を用いた解錠操作を図１５ないし図１８を参照して説明する。図１５（Ａ）の状態から、キー３を左回転させると、第１、第２コードディスク８，９の開口８ａ，９ａ内では、キー３が左４５°の位置まで空転し、リテーナディスク７のみを左に４５°回転させる（図１５（Ｂ））。そこでキー３の左回転駆動面３ｃが、第１コードディスク８の鍵挿入開口８ａの縁８ｅに当接し、また側面３ｂが第２コードディスク９の鍵挿入開口９ａにおける左回転受動面９ｆに当接し、ここからコードディスク８，９を回転させる。コードディスク８，９がさらに４５°回転すると、それらの駆動凸部８ｄ，９ｄがロータ６の左回転受動面１７ｃに当接する（図１６（Ｃ））。この間に、リテーナディスク７は、キー３と共に、初期位置から９０°回転し、それのロック部７ｄがサイドバー１０を通過（図１５（Ｂ））し、凹部７ｃがサイドバー１０に対向するので、サイドバー１０は解放される。したがって、ここからリテーナディスク７、コードディスク８，９、サイドバー１０をロータ６と一体に左回転させることができる。ロータ６が左回転すると、それのねじ棒部１６が締め付けナット部材１１と共に左回転し、ストッパ杆５の左回転規制面に当接する（図１７（Ｅ））。これによって、締め付けナット部材１１は回転が止められるので、その後ねじ棒部１６が左回転を継続すると、ねじ棒部１６に対して相対的に下降し、マンホール蓋５１の下面から離れる。図１７（Ｆ）の状態からさらにキー３を１３５°左回転させて図１８（Ｇ）の状態で解錠操作を終了したとして、ここから、キー３を抜き取る場合、今度はキー３を右へ１．５回転（図１８（Ｇ））させる。最初の右４５°回転の間は、コードディスク８，９に対して、キー３が空転し、リテーナディスク７のみがキー３と共に回転し、次の４５°で、ロータ６の左回転受動面１７ｃからコードディスク８，９の駆動凸部８ｄ，９ｄが離れ、ロータ６の右回転受動面１７ｄに駆動凸部８ｄ，９ｄが当接し、リテーナディスク７の凹部７ｂがサイドバー１０に対向する。さらに右回転させると、ロータ６が回転し、ナット部材１１がストッパ杆５の右回転規制面５ａに当接した状態で、各部が鍵挿入位置（図１８（Ｈ）、図１５（Ａ））に整列し、キー３を閉塞栓２から抜き取ることができる。この状態で、閉塞栓２を引き上げて、位置決め突起１２ｂをマンホール蓋の位置決め凹部５３から抜いた上で、軸周りに所定角度回転させて、締め付けナット部材１１の位置を鍵孔５２に適合させることで、鍵孔５２から抜き取ることができる。 Embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 5, the manhole cover keyhole closing and locking device 1 is inserted into the keyhole 52 of the manhole cover 51 and locked so that it cannot be removed in the state where the keyhole 52 is closed. A stopper 2 and a key 3 for locking and unlocking the stopper 2 are provided.
The closing plug 2 includes a main body 4, a stopper rod 5, a rotor 6, a retainer disk 7, first and second code disks 8 and 9, a side bar 10 and a nut member 11.
The obturator plug body 4 includes a disk portion 12 and a housing portion 13. The disk portion 12 has a positioning projection 12a fitted in a positioning recess 53 formed on the upper surface portion of the manhole cover 51 on the lower surface, and an opening 12b for inserting the key 3 in the center, and the lower surface is It contacts the upper surface of the manhole cover 51. 12c is a key insertion / removal position display.
As shown in FIG. 6, the housing part 13 of the obturator plug body 4 is cylindrical and extends downward from the lower surface of the disk part 12 concentrically therewith and can be inserted into the keyhole 52 of the manhole cover 51. A cylindrical space 13a having a larger inner diameter than the opening 12b of the disk portion 12 is formed inside the housing portion 13, and a lock groove 13b extending in the axial direction is formed on the inner periphery. As shown in FIG. 5, the lower end of the housing part 13 is closed by a lid 14 having an opening 14a having a smaller diameter than the cylindrical space 13a.
As shown in FIGS. 1, 2, and 4, the pair of stopper rods 5 extends downward in the axial direction from the radially opposed position of the lower peripheral edge of the housing portion 13, and the right rotation restriction surface 5 a and the left rotation restriction surface, respectively. 5b.
As shown in FIG. 5, the rotor 6 includes a cylinder portion 15 accommodated in the housing portion 13 so as to be relatively rotatable about a rotation axis, and a screw rod portion 16 extending downward therefrom. A front disk 19 is interposed between the upper end of the cylinder part 15 and the edge part of the opening 12b of the disk part 12 so as to be rotatable relative to the rotation axis. As shown in FIG. 9, the front disk 19 has a disk shape and has a key insertion opening 19a in the center. As shown in FIG. 7, the cylinder portion 15 has a lower end wall having an open upper end and a lower end having an opening 18a. 18 is occluded. The cylindrical side wall 17 is formed with an axial slit 17a and a notch 17b. The notch portion 17b has a left rotation passive surface 17c and a right rotation passive surface 17d that are opposed to the left and right in the circumferential direction of the side wall 17.
The screw rod portion 16 has a through hole 16a that communicates with the opening 18a of the lower end wall 18 of the cylinder portion 15. The screw rod portion 16 extends downward in the axial direction from the center of the lower end wall 18, and the opening 14a of the housing portion 13 is relatively rotatable. To penetrate.
As shown in FIG. 5, four retainer disks 7, two first code disks 8, and three second code disks 9, which are rotated by the key 3, are respectively relative to each other about the rotation axis in the cylinder portion 15. It is stacked in a rotatable manner. From the top, the stacking order is: retainer disk 7-second code disk 9-first code disk 8-retainer disk 7-second code disk 9-retainer disk 7-first code disk 8-retainer disk 7-second code. It is the order of the disk 9.
As shown in FIG. 10, the four retainer disks 7 have the same shape, and one of them is accommodated in the upper end portion in the cylinder portion 15. The retainer disk 7 includes a central key insertion opening 7a, outer peripheral first and second recesses 7b and 7c, and a lock portion 7d therebetween. That is, the retainer disk 7 has a circular basic outer periphery having the same diameter as the inner diameter of the cylinder portion 15, and the first and second recesses 7b and 7c are formed at positions 90 ° apart from each other on the basic outer periphery. A lock portion 7d having a basic outer periphery is formed between the two recesses 7b and 7c.
As shown in FIG. 11, the two first code disks 8 have the same shape. The first code disk 8 has a key insertion opening 8 a in the center and has a circular basic outer periphery having the same diameter as the retainer disk 7. On the outer periphery, first and second concave portions 8b and 8c and a driving convex portion 8d are formed. The first and second recesses 8b and 8c are formed at positions 45 ° apart from each other on the basic outer periphery, and the drive projection 8d is formed at a position 135 ° away from the first recess 8b in the counterclockwise direction. The The driving convex portion 8 d protrudes into the notch portion 17 b of the cylinder portion 15. Accordingly, the first code disk 8 is relatively rotatable around the rotation axis in the cylinder portion 15 of the rotor 6 within a range of 45 ° in which the drive convex portion 8d is allowed to rotate relatively in the cutout portion 17b. .
As shown in FIG. 12, the three second code disks 9 have the same shape, and one of them is placed under the retainer disk 7. The second code disk 9 has a key insertion opening 9 a in the center, and has a circular basic outer periphery having the same diameter as the retainer disk 7. The outer periphery includes first and second recesses 9b and 9c and a drive protrusion 9d. The first and second recesses 9b and 9c are formed at positions 45 ° apart from each other on the basic outer periphery. The drive convex portion 9d is provided at a position distant from the first concave portion 9b by 135 ° in the counterclockwise direction so as to protrude radially outward from the basic outer periphery. The driving convex portion 9 d protrudes into the notch portion 17 b of the cylinder portion 15. Therefore, the second code disk 9 is relatively rotatable around the rotation axis in the cylinder portion 15 of the rotor 6 within a range of 45 ° in which the drive convex portion 9d is allowed to rotate relatively in the cutout portion 17b. .
As shown in FIG. 5, a leaf spring 20 is interposed between the lowermost code disk 9 and the end wall 18 of the cylinder portion 15, and appropriate contact resistance is provided between the disks 7, 8, 9. Give.
As shown in FIGS. 10 to 12, the side bar 10 is held in the slit 17 a of the cylinder portion 15, the outer position where it falls into the lock groove 13 b of the housing portion 13, the code disks 8, 9 and the retainer disk 7. Although it is movable in the radial direction of the cylinder portion 15 between the recesses 7b, 7c, 8b, 8c, 9b, and 9c, it is movable in the radial direction of the cylinder portion 15 and is normally rotatable in the housing 13 portion together with the cylinder portion 15. As shown in FIG. 14B, when the rotor 6 comes into contact with the lock portion 7d of the retainer disk 7 and falls into the lock groove 13b, the rotor 6 is prevented from relatively rotating in the housing portion 13.
The tightening nut member 11 has an outer shape that passes through the key hole 52 at a predetermined rotational angle position with respect to the key hole 52 of the manhole cover 51 but cannot pass at other rotational angle positions. And is screwed to the threaded rod portion 16. When the nut member 11 is inserted into the keyhole 52 of the manhole cover 51, the tightening nut member 11 is below the lower surface of the manhole cover 51, and when the screw rod portion 16 rotates clockwise, the right rotation restricting surface 5a of the stopper rod 5 (FIG. 4). ) Is restricted, the rotation with the screw rod portion 16 is restricted, the manhole lid 51 is tightened with the disk portion 12 by moving upward relative to the main body 4, and when the screw rod 16 rotates counterclockwise. By abutting against the left rotation restricting surface 5b (FIG. 4) of the stopper rod 5, the manhole cover 51 is released by lowering relative to the main body 4.
On the other hand, as shown in FIGS. 1 and 8, the key 3 is located at a position corresponding to the first code disk 8 of the shaft body 3a having two parallel side surfaces 3b extending in the axial direction with respect to the basic side surface 3b. It has a cord groove 3d having two parallel left rotation drive surfaces 3c rotated by 45 °.
As shown in FIG. 10, the key insertion opening 7a of the retainer disk 7 that receives the key 3 has a shape corresponding to the basic cross section (FIG. 8A) of the shaft 3a of the key 3, and the basic of the shaft 3a. It has a parallel side surface 7e corresponding to the side surface 3b. The parallel side surface 7e is formed at a rotation angle of 45 ° with respect to the first and second recesses 7b and 7c.
As shown in FIG. 11, the key insertion opening 8a of the first code disk 8 has a shape corresponding to the basic cross section of the shaft body 3a of the key 3, and has a parallel side surface 8e corresponding to the basic side surface 3b of the shaft body 3a. Have. The parallel side surface 8e is formed in a direction orthogonal to the projecting direction of the driving convex portion 8d.
As shown in FIG. 12, the key insertion opening 9a of the second code disk 9 has a shape corresponding to a locus obtained by rotating the transverse cross-sectional shape (FIG. 8A) of the key shaft 3a around the axis by 45 °. , A right-turning passive surface 9e composed of two parallel side surfaces orthogonal to the projecting direction of the drive projection 9d, and a left-turning passive surface 9f composed of two parallel side surfaces rotated 45 ° to the right with respect to this. It is formed into a shape having.
As shown in FIGS. 13A and 15A, the first recess 7b of the retainer disk 7, the first recesses 8b and 9b of the two code disks, and the slit 17a of the rotor 6 that holds the sidebar 10 are provided. Is opposed to the lock groove 13b of the housing portion, the drive convex portions 8d, 9d of the two code disks 8, 9 are in contact with the right rotation passive surface 17d of the notch 17b of the rotor, and the nut member 11 is a stopper. The state in which the retainer disk 7, the code disks 8 and 9, the rotor 6, and the nut member 11 are aligned so as to come into contact with the right rotation restricting surface 5 a of the flange 5 is set as the key insertion / removal position.
Now, the operation of rotating the rotor 6 clockwise from the key insertion / removal position, that is, tightening the nut member 11 in a state where the closing plug 2 is inserted into the key hole 52 of the manhole cover 51 will be described with reference to FIG. The tightening operation (locking operation) of the nut member 11 can be performed without using the key 3, that is, using a tool such as a screwdriver that can be inserted into the key insertion openings 19a, 7a, 8a, and 9a.
Here, an example will be described in which the operation is performed using a tool T having only a shaft body similar to the key 3 and in which the code groove 3c is not formed. When the tool T is inserted into the key insertion / removal position in FIG. 13A and rotated to the right, the first code disk 8 rotates to the right if at least the shaft body is inserted into the key insertion opening 8a of the first code disk 8. Then, the drive convex portion 8d pushes the right rotation passive surface 17d of the rotor 6 to rotate the rotor 6. The rotor 6 can continue to rotate right in the housing portion 13 while holding the side bar 10 and maintaining the aligned state of the retainer disc 7 and the second code disc 9 together. When the screw rod portion 16 of the rotor 6 rotates to the right, the tightening nut member 11 is in contact with the right rotation restricting surface 5a of the stopper rod 5 and cannot rotate right. By contacting the lower surface of the manhole cover 51, the manhole cover 51 is sandwiched and locked with the disk portion 12. In this state, the closing plug 2 cannot be removed from the key hole 52, and therefore the manhole cover 51 cannot be opened.
On the other hand, the unlocking operation (the operation of loosening the nut member 11) is performed by rotating the rotor 6 counterclockwise from the key insertion / removal position. First, the operation when this operation is performed using the tool T that is not the regular key 2 will be described with reference to FIG. When the tool T is rotated counterclockwise from the position shown in FIG. 14A, the retainer disk 7 and the first code disk 8 rotate together, but the drive projection 8d reaches the counterclockwise passive surface 17c of the rotor 6. The rotor 6 is in a stationary state (until 45 ° left rotation). However, when the retainer disk 7 is rotated by 45 °, the lock portion 7d pushes the side bar 10 outward in the radial direction, and drops into the lock groove 13b of the housing portion 13 and holds it. In this state, the side bar 10 in the slit 17a of the rotor 6 cannot escape inward, so the rotor 6 is locked and cannot rotate leftward.
Thus, the locking operation can be performed without using the key 3, that is, using a tool such as a screwdriver that can be inserted into the key insertion openings 19a, 7a, 8a, and 9a. It cannot be done with such tools. Once the manhole cover 51 is removed and the work in the manhole is completed, the operator can close the keyhole 52 without using the key 3 and can be locked using an appropriate tool. Convenience is good.
Next, the unlocking operation using the regular key 3 will be described with reference to FIGS. When the key 3 is rotated counterclockwise from the state shown in FIG. 15A, the key 3 idles to the left 45 ° in the openings 8a and 9a of the first and second code disks 8 and 9, and the retainer disk 7 Only 45 degrees to the left (FIG. 15B). Therefore, the left rotation drive surface 3c of the key 3 contacts the edge 8e of the key insertion opening 8a of the first code disk 8, and the side surface 3b contacts the left rotation passive surface 9f of the key insertion opening 9a of the second code disk 9. The code disks 8 and 9 are rotated from here. When the code discs 8 and 9 are further rotated by 45 °, their drive convex portions 8d and 9d come into contact with the left rotation passive surface 17c of the rotor 6 (FIG. 16C). During this time, the retainer disk 7 rotates together with the key 3 by 90 ° from the initial position, and its locking portion 7d passes through the side bar 10 (FIG. 15B), and the recess 7c faces the side bar 10. The sidebar 10 is released. Accordingly, the retainer disk 7, the code disks 8 and 9, and the side bar 10 can be rotated counterclockwise together with the rotor 6 from here. When the rotor 6 rotates counterclockwise, the screw rod portion 16 thereof rotates counterclockwise together with the tightening nut member 11 and abuts against the counterclockwise rotation restricting surface of the stopper rod 5 (FIG. 17E). As a result, the rotation of the tightening nut member 11 is stopped, and if the screw rod portion 16 continues to rotate leftward thereafter, the screw nut portion 11 descends relative to the screw rod portion 16 and moves away from the lower surface of the manhole cover 51. If the key 3 is further rotated 135 ° from the state shown in FIG. 17F to complete the unlocking operation in the state shown in FIG. 18G, when the key 3 is extracted from this state, the key 3 is now moved to the right. 1.5 turns (FIG. 18G). During the first 45 ° rotation to the right, the key 3 is idled with respect to the code discs 8 and 9, and only the retainer disk 7 is rotated together with the key 3, and at the next 45 °, the left rotation passive surface 17c of the rotor 6 is rotated. , The drive convex portions 8d and 9d of the code disks 8 and 9 are separated from each other, the drive convex portions 8d and 9d are brought into contact with the passively rotating right surface 17d of the rotor 6, and the concave portions 7b of the retainer disk 7 are opposed to the side bars 10. Further rotation to the right causes the rotor 6 to rotate and the nut member 11 to come into contact with the right rotation restricting surface 5a of the stopper rod 5 so that each part is in the key insertion position (FIGS. 18H and 15A). And the key 3 can be removed from the obturator plug 2. In this state, the closure plug 2 is pulled up, the positioning projection 12b is removed from the positioning recess 53 of the manhole cover, and then rotated by a predetermined angle around the axis so that the position of the tightening nut member 11 is adapted to the key hole 52. Thus, it can be extracted from the keyhole 52.

１鍵孔用閉塞栓錠装置
２閉塞栓
３キー
３ａ軸体
３ｂ基本側面
４閉塞栓の本体
５ストッパ杆
５ａ右回転規制面
５ｂ左回転規制面
６ロータ
７リテーナディスク
７ａ鍵挿入開口
７ｂ第１の凹部
７ｃ第２の凹部
７ｄロック部
８第１コードディスク
８ａ鍵挿入開口
８ｂ第１の凹部
８ｃ第２の凹部
８ｄ駆動凸部
９第２コードディスク
９ａ鍵挿入開口
９ｂ第１の凹部
９ｃ第２の凹部
９ｄ駆動凸部
９ｅ右回転受動面
９ｆ左回転受動面
１０サイドバー
１１締め付けナット部材
１２円盤部
１２ｂ開口
１３ハウジング部
１３ａ円筒空間
１３ｂロック溝
１４蓋
１４ａ開口
１５シリンダ部
１６ねじ棒部
１６ａ貫通孔
１７側壁
１７ａスリット
１７ｂ切り欠き部
１８下端壁
１８ａ開口
１９フロントディスク
２０板ばね
５１マンホール蓋
５２鍵孔
５３位置決め凹部
Ｔ工具 DESCRIPTION OF SYMBOLS 1 Locking plug device for key holes 2 Blocking plug 3 Key 3a Shaft body 3b Basic side surface 4 Main body of blocking plug 5 Stopper rod 5a Right rotation restricting surface 5b Left rotation restricting surface 6 Rotor 7 Retainer disk 7a Key insertion opening 7b First Concave part 7c Second concave part 7d Lock part 8 First code disk 8a Key insertion opening 8b First concave part 8c Second concave part 8d Driving convex part 9 Second code disk 9a Key insertion opening 9b First concave part 9c Second Concave portion 9d Driven convex portion 9e Passive right rotation surface 9f Passive left rotation surface 10 Sidebar 11 Tightening nut member 12 Disc portion 12b Opening 13 Housing portion 13a Cylindrical space 13b Lock groove 14 Lid 14a Opening 15 Cylinder portion 16 Screw rod portion 16a Through hole 17 Side wall 17a Slit 17b Notch 18 Lower end wall 18a Opening 19 Front disk 20 Leaf spring 51 Manhole cover 52 Hole 53 positioning recess T tool

Claims

A plug that is configured to be freely inserted into and removed from the keyhole of the manhole cover, is inserted into the keyhole, and is locked so that it cannot be removed in a state where the keyhole is closed,
A key for locking and unlocking the closure plug,
The plug is
A disk part that has an opening for inserting a key in the center and whose lower surface is in contact with the upper surface of the manhole cover; extends downward from the lower surface of the disk part concentrically with the disk part and is inserted into the key hole of the manhole cover A housing that has a cylindrical space with an inner diameter larger than the opening of the disk portion on the inner side, a lock groove extending in the axial direction on the inner periphery, and a lower end closed with a lid having an opening with a smaller diameter than the cylindrical space. A main body comprising a portion;
A pair of stopper rods extending downward in the axial direction from the radially opposite position of the lower peripheral edge of the housing part, each having a right rotation restriction surface and a left rotation restriction surface;
The upper end is opened, the lower end is closed by a lower end wall having an opening, the side wall has an axial slit, and has a notch portion having a left rotation passive surface and a right rotation passive surface facing left and right in the rotation direction. A cylinder portion accommodated in the housing portion so as to be relatively rotatable about a rotation axis; a through hole communicating with the opening of the cylinder portion, and extending in the axial direction downward from the center of the lower end wall of the cylinder portion. A rotor having a screw rod portion that passes through the opening of the lid in a relatively rotatable manner;
The upper part in the cylinder part of the rotor is accommodated so as to be relatively rotatable around a rotation axis, has a circular basic outer periphery having the same diameter as the inner diameter of the cylinder part, has a key insertion opening in the center, and is 90 ° from the basic outer periphery. A retainer disk having first and second recesses at a distant position and having a lock portion comprising a basic outer periphery between the two recesses;
Each of them is disposed below the retainer disk, has a circular basic outer periphery of the same diameter as the retainer disk, has a key insertion opening of a different shape in the center, and is located at a position 45 ° apart from the basic outer periphery. It has a 2nd recessed part, and has a drive convex part which protrudes in the notch part of the said cylinder part in the position left | separated 135 degrees to the left rotation from the said 1st recessed part, The said drive convex part is a cylinder part First and second at least two code disks accommodated in a cylinder portion of the rotor so as to be relatively rotatable around a rotation axis within a range of 45 ° in which relative rotation is allowed in the notch portion;
It can be moved in the radial direction of the cylinder part between the outer position held in the slit of the cylinder part and falling into the lock groove of the housing part and the inner position dropped into the recess of the code disk and retainer disk. The side bar is normally movable in the housing part together with the cylinder part, but prevents the rotor from rotating relatively in the housing part when it contacts the lock part of the retainer disk and falls into the lock groove;
It has an outer shape that passes through the keyhole at a predetermined rotation angle position with respect to the keyhole of the manhole cover but cannot pass at other rotation angle positions, is screwed into the screw rod, and is below the lower surface of the manhole cover. When the screw rod rotates to the right, the manhole cover is raised relative to the main body by coming into contact with the right rotation restricting surface of the stopper rod and tightening the manhole cover to the left of the screw rod. A clamping nut member that lowers relative to the main body and releases the manhole cover by abutting against the counterclockwise rotation restriction surface of the stopper rod during rotation,
The key is
A shaft groove having two parallel side surfaces extending in the axial direction has a cord groove having two parallel left rotation drive surfaces rotated by 45 ° relative to the basic side surface at a position corresponding to the first code disk. ,
The key insertion opening of the retainer disk has a shape corresponding to the cross section of the shaft body of the key, and the parallel side surface corresponding to the basic side surface of the shaft body is in relation to the first and second recesses of the retainer disk. Formed at a rotation angle of 45 °,
The key insertion opening of the first code disk has a shape corresponding to the cross section of the shaft body of the key, and the parallel side surface corresponding to the basic side surface of the shaft body protrudes from the drive convex portion of the first code disk. Formed in a direction perpendicular to the direction,
The key insertion opening of the second code disk has a shape corresponding to a locus obtained by rotating the cross-sectional shape of the shaft body of the key by 45 °, and is orthogonal to the protruding direction of the drive convex portion of the second code disk. Formed into a shape having a right-turning passive surface consisting of two parallel side surfaces in the direction and a left-turning passive surface consisting of two parallel side surfaces rotated 45 ° to the left with respect to this,
The first concave portion of the retainer disk, the first concave portion of the two code disks, and the slit of the rotor that holds the side bar are opposed to the lock groove of the housing portion, and the drive convex portions of the two code disks The retainer disk, code disk, rotor, and nut member are aligned so that the nut member comes into contact with the right rotation passive surface of the rotor notch and the right rotation restricting surface of the stopper rod. Set as position,
Thereby, the right rotation of the rotor from the key insertion / removal position, that is, the tightening of the nut member , does not disturb the alignment state of the retainer disk, code disk, rotor and nut member , and the key insertion opening of the first code disk The manhole cover is closed by a non-specific operation member inserted into the keyhole, but the left rotation of the rotor, that is, the loosening of the nut member is enabled only by the operation with the key. Stopper device.