JPS6117029Y2

JPS6117029Y2 -

Info

Publication number: JPS6117029Y2
Application number: JP19127881U
Authority: JP
Priority date: 1981-12-21
Filing date: 1981-12-21
Publication date: 1986-05-24
Also published as: JPS5894741U

Description

【考案の詳細な説明】「考案の目的」（考案の技術分野）本考案は下水道や大型の水槽等へ人が出入りす
るために設けられるマンホールの蓋の係止構造に
関するものである。[Detailed description of the invention] "Purpose of the invention" (Technical field of the invention) The present invention relates to a locking structure for a manhole cover provided for people to enter and exit sewers, large water tanks, etc.

（従来技術とその問題点）従来マンホールはその開口部が着脱自在な蓋で
覆われている。(Prior art and its problems) Conventionally, the opening of a manhole is covered with a removable cover.

上記蓋は単に開口部の周壁上端に嵌め合うだけ
で、工具を使用せずとも誰でも簡単に取外せるよ
うになつている。 The lid simply fits onto the upper end of the peripheral wall of the opening and can be easily removed by anyone without using any tools.

ところが、この様に蓋が簡単に取外せるような
構造であると、上記下水道等の保守点検作業を行
う作業者以外の者、即ちマンホールの構造や危険
性を熟知しない一般の人が不用意にマンホールに
入り込み、事故を起す危険性があつた。 However, if the lid is structured so that it can be easily removed, it could be easily removed by a person other than the worker who performs maintenance and inspection work on the sewer system, or in other words, by an ordinary person who is not familiar with the structure and dangers of manholes. There was a risk of it entering the manhole and causing an accident.

この様な問題を解決すべくなされた提案として
実開昭51−61517号公報のものがある。 A proposal made to solve such problems is disclosed in Japanese Utility Model Application Publication No. 51-61517.

このものはマンホールの開口周壁と蓋とを径方
向対称位置において、その一方側で上下一対の係
止片及びそれら係止片を連結するリンクにより連
結固定し、他方側で連結ボルト及び操作摘み付き
の止ナツトにより連結固定したものである。 This device connects and fixes the manhole opening circumferential wall and the lid at radially symmetrical positions on one side using a pair of upper and lower locking pieces and a link that connects the locking pieces, and has a connecting bolt and an operation knob on the other side. It is connected and fixed with a locking nut.

ところが、前記の様な構造では連結ボルトの止
ナツトを操作摘みでゆるめることにより、蓋の係
止が簡単に解除されてしまい、何等工具を使用せ
ずに作業を行えるため、この作業の簡便さ故に依
然として一般の人が蓋を開けて不用意にマンホー
ルへ入り込んでしまう危険を招く可能性が高い。 However, with the structure described above, the locking of the lid is easily released by loosening the locking nut of the connecting bolt with the operating knob, and the work can be done without using any tools, so this work is not easy. Therefore, there is still a high possibility that members of the public may open the lid and carelessly enter the manhole.

（考案が解決しようとする技術的課題）本考案が解決しようとする技術的課題は、蓋の
係止解除作業に特殊工具を必要とするようにし、
敢えて工具なしでは蓋の係止を解除できないよう
にすることにある。(Technical problem to be solved by the invention) The technical problem to be solved by the invention is that a special tool is required to unlock the lid,
The purpose is to make it so that the lid cannot be unlocked without a tool.

「考案の構成」（技術的課題を解決するための手段）上記課題を解決すべく本考案が講じた手段は、
開口部の周壁がその開口部周囲から独立して起立
し、前記開口部がその周壁上端に着脱自在に嵌め
合う蓋で覆われたマンホールにおいて、上記蓋の
外周部とそれより下方の開口部周壁の外面とに
夫々係止片を上下に対応させて設け、この２つの
係止片間にわたつて平面方向に回動可能な連結軸
を抜き差し可能に挿着し、前記連結軸にはマンホ
ール開口部周壁の係止片に対する係止位置と係止
解除位置とを付与すると共に、蓋の係止片に対し
連結軸をその外周のくびれ部に軸線を直交させて
係合する六角穴付きネジで回り止め及び抜け止め
し、前記２つの係止片を連結したものである。"Structure of the invention" (Means for solving the technical problems) The means taken by the invention to solve the above problems are:
In a manhole in which a peripheral wall of an opening stands up independently from the periphery of the opening, and the opening is covered with a lid that is removably fitted to the upper end of the peripheral wall, the outer peripheral part of the lid and the peripheral wall of the opening below it. Locking pieces are provided on the outer surface of the manhole opening, respectively, and a connecting shaft that can be rotated in a plane direction is inserted and removed between the two locking pieces so that the connecting shaft can be inserted into and removed from the manhole opening. A hexagon socket head screw is used to provide a locking position and a locking release position to the locking piece on the peripheral wall of the lid, and to engage the connecting shaft with the locking piece of the lid with its axis orthogonal to the constriction of the outer periphery. It prevents rotation and is prevented from coming off, and the two locking pieces are connected.

（作用）上記手段によれば、六角穴付きネジを六角レン
チで回動させて連結軸外周のくびれ部との係合を
ゆるめることにより、連結軸が抜け止めされた状
態で回動可能とされ、且つこの状態で連結軸を係
止解除位置まで回動させることにより、連結軸と
マンホール開口部周壁の係止片との係止が解除さ
れ、該係止片の蓋と係止片との連結を外してマン
ホールの開口部から蓋が取外されるものである。(Function) According to the above means, by rotating the hexagon socket head screw with a hexagonal wrench to loosen the engagement with the constricted portion on the outer periphery of the connecting shaft, the connecting shaft can be rotated while being prevented from coming off. , and in this state, by rotating the connecting shaft to the locking release position, the locking between the connecting shaft and the locking piece on the surrounding wall of the manhole opening is released, and the lid of the locking piece and the locking piece are released. The lid is removed from the manhole opening by disconnecting the connection.

「考案の効果」以上の様な本考案の構成によれば、蓋の係止解
除作業を行うには特殊工具として六角レンチが必
要であり、該レンチなしでは蓋の係止を解除でき
ず、一般の人が蓋を開けてマンホールへ不用意に
入り込んでしまう危険を回避できるものである。"Effects of the Invention" According to the configuration of the present invention as described above, a hexagonal wrench is required as a special tool to unlock the lid, and the lid cannot be unlocked without the wrench. This prevents the public from opening the lid and accidentally entering the manhole.

「実施例」本考案実施の一例を下水道用マンホールの蓋の
係止構造について図面により説明すると、図中Ａ
はマンホールであり、地中の下水道（不図示）に
連絡すると共に路面等に開口されている。``Example'' An example of the implementation of the present invention will be explained with reference to a drawing regarding a locking structure for a sewer manhole cover.
is a manhole, which connects to an underground sewer (not shown) and opens onto the road surface.

前記マンホールＡの開口部１はその周壁１ａが
該開口部１周囲から独立して起立している。 The peripheral wall 1a of the opening 1 of the manhole A stands up independently from the periphery of the opening 1.

２は前記開口部１を覆う蓋であり、開口部周壁
１ａの上端部外周に着脱自在に嵌め合つている。 Reference numeral 2 denotes a lid that covers the opening 1, and is detachably fitted to the outer periphery of the upper end of the opening peripheral wall 1a.

そして、上記マンホールＡにおいてその開口部
１を覆う蓋２を開口部周壁１ａに係止されるが、
その係止れる箇所は１箇所乃至複数箇所であり又
その構造は次の様になつている。 Then, in the manhole A, a lid 2 covering the opening 1 is locked to the opening surrounding wall 1a.
It can be locked at one or more locations, and its structure is as follows.

３は蓋２の外周部に溶接して設けられる係止片
であり、断面略Ｌ字型のアングル材が使用され蓋
２から水平に突出している。 A locking piece 3 is welded to the outer periphery of the lid 2, and is made of an angle member having a substantially L-shaped cross section and projects horizontally from the lid 2.

４は蓋２より下方の開口部周壁１ａ外面に設け
られた係止片であり、その基部に溶接された止板
５を釘６で開口部周壁１ａに止着して固定され、
前記係止片３の下方にそれぞれ平行に対応して開
口部周壁１ａから突出している。 Reference numeral 4 denotes a locking piece provided on the outer surface of the opening peripheral wall 1a below the lid 2, and a stop plate 5 welded to the base thereof is fixed to the opening peripheral wall 1a with nails 6.
They protrude from the opening peripheral wall 1a in parallel to the lower part of the locking pieces 3, respectively.

７は前記係止片４に設けられた長孔である。 7 is a long hole provided in the locking piece 4.

８は前記２つの係止片３，４を連結する連結軸
であり、係止片３，４に抜き差し可能に挿着され
且つ平面方向に回動可能となつている。この連結
軸８は逆Ｔ字型に形成され、マンホール開口部周
壁１ａの係止片４に対する係止位置と係止解除位
置とを付与されている。即ち、連結軸８は係止位
置において下端の水平杆部８ａが前記係止片４の
長孔７下方にそれと直交状に対応し、係止片４上
方への移動が規制されて係止片４に係止される一
方、係止解除位置におい水平杆部８ａが前記長孔
７と合致して同孔７を通過できるようになつてい
る。 Reference numeral 8 denotes a connecting shaft that connects the two locking pieces 3 and 4, and is inserted into and removed from the locking pieces 3 and 4 and is rotatable in a plane direction. This connecting shaft 8 is formed in an inverted T-shape, and is provided with a locking position and a locking release position with respect to the locking piece 4 of the manhole opening peripheral wall 1a. That is, in the locking position of the connecting shaft 8, the horizontal rod portion 8a at the lower end corresponds to the lower part of the elongated hole 7 of the locking piece 4 in a perpendicular manner thereto, and the upward movement of the locking piece 4 is restricted. 4, while in the unlocked position, the horizontal rod portion 8a aligns with the elongated hole 7 and can pass through the hole 7.

また、連結軸８の垂直杆部８ｂは蓋２の側の係
止片３下面に溶接された筒体９を挿通し、上端に
設けられた細径のネジ部８b₁が前記係止片３を貫
通している。 Further, the vertical rod portion 8b of the connecting shaft 8 passes through the cylinder 9 welded to the lower surface of the locking piece 3 on the lid 2 side, and the small diameter screw portion 8b ₁ provided at the upper end is connected to the locking piece 3. penetrates through.

８b₂は前記垂直杆部８ｂにおける筒体９との嵌
合部に形成されたくびれ部であり、このくびれ部
８b₂に筒体９外周から螺着された六角穴付きネジ
１０の先端が線を直交させて係合することによ
り、連結軸８の回り止めと上下方向の抜け止めが
なされている。 Reference numeral _8b2 is a constriction formed at the fitting part of the vertical rod part 8b with the cylinder body 9, and the tip of the hexagon socket screw 10 screwed into this constriction part _8b2 from the outer periphery of the cylinder body 9 is a line. By orthogonally engaging the connecting shafts 8, the connecting shaft 8 is prevented from rotating and from coming off in the vertical direction.

１１は前記係止片３から上方へ突出するネジ部
８b₁にワツシヤ１２を介して螺着されたナツトで
あり、このナツト１１によつ連結軸８が係止片３
に固定された回り止めされている。 Reference numeral 11 denotes a nut screwed onto a threaded portion 8b1 projecting upward from the locking piece ₃ through a washer 12, and the connecting shaft 8 is connected to the locking piece 3 by this nut 11.
It is fixed to prevent rotation.

しかして、上記係止構造により係止された蓋２
を取外す際は、先ずスパナ等の工具により連結軸
８上端のナツト１１をゆるめて取外すと共に、六
角レンチによりネジ１０をゆるめる。 Therefore, the lid 2 locked by the above-mentioned locking structure
To remove it, first loosen and remove the nut 11 at the upper end of the connecting shaft 8 using a tool such as a spanner, and then loosen the screw 10 using a hexagonal wrench.

そして、連結軸８を回動させてその下端の水平
杆部８ａを係止片４の長穴７に合致させ、その状
態で蓋５を持ち上げることにより連結軸８が係止
片４から外れ、蓋２がマンホールＡの開口部周壁
１ａにより取外される。 Then, by rotating the connecting shaft 8 to align the horizontal rod portion 8a at the lower end with the elongated hole 7 of the locking piece 4, and lifting the lid 5 in this state, the connecting shaft 8 is removed from the locking piece 4. The lid 2 is removed by the opening peripheral wall 1a of the manhole A.

尚、蓋２が取外された状態で連結軸８は蓋２即
ち係止片３に取付いたままであり、その粉失が防
止されている。 Incidentally, when the lid 2 is removed, the connecting shaft 8 remains attached to the lid 2, that is, the locking piece 3, and the powder is prevented from being lost.

[Brief explanation of the drawing]

第１図は本考案係止構造を示す縦断面図、第２
図は第１図における一部切欠矢視図、第３図は
第１図の−線断面図である。尚、図中、Ａ……マンホール、１……開口部、
１ａ……開口部周壁、２……蓋、３，４……係止
片、８……連結軸、８b₂……くびれ部、１０……
六角穴付きネジ。 Figure 1 is a longitudinal sectional view showing the locking structure of the present invention, Figure 2
The figure is a partially cutaway view taken along the arrow in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. In addition, in the figure, A...manhole, 1...opening,
1a...Opening peripheral wall, 2...Lid, 3, 4...Locking piece, 8...Connection shaft, 8b ₂ ...Neck part, 10...
Hex socket screw.

Claims

[Scope of utility model registration request]

In a manhole in which a peripheral wall of an opening stands up independently from the periphery of the opening, and the opening is covered with a lid that is removably fitted to the upper end of the peripheral wall, the outer peripheral part of the lid and the peripheral wall of the opening below it. Locking pieces are provided on the outer surface of the manhole opening, respectively, and a connecting shaft that can be rotated in a plane direction is inserted and removed between the two locking pieces so that the connecting shaft can be inserted into and removed from the manhole opening. A hexagon socket head screw is used to provide a locking position and a locking release position to the locking piece on the peripheral wall of the lid, and to engage the connecting shaft with the locking piece of the lid with its axis orthogonal to the constriction of the outer periphery. A locking structure for a manhole cover that prevents rotation and removal and connects the two locking pieces.