JPH0657771A - Facilities for underground structure, fitting mechanism of metal tools - Google Patents
Facilities for underground structure, fitting mechanism of metal toolsInfo
- Publication number
- JPH0657771A JPH0657771A JP4231325A JP23132592A JPH0657771A JP H0657771 A JPH0657771 A JP H0657771A JP 4231325 A JP4231325 A JP 4231325A JP 23132592 A JP23132592 A JP 23132592A JP H0657771 A JPH0657771 A JP H0657771A
- Authority
- JP
- Japan
- Prior art keywords
- mounting
- fitting portion
- fitting
- underground structure
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はマンホールその他の地下
構造物の非可動部を装着部とし、そこに補助梯子やヒン
ジ金具その他の取り付け部材を装着するための地下構造
物用装備品、金具類の装着機構に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a non-movable portion of a manhole or other underground structure as a mounting portion, and an equipment or metal fittings for an underground structure for mounting an auxiliary ladder, hinge metal fittings or other mounting members thereon. The mounting mechanism of the.
【0002】[0002]
【従来の技術】例えばマンホール受枠の開口にはその開
口を閉じる鉄蓋を蝶着するためのヒンジ機構が装備され
るが、ヒンジ金具の取り付け部材は受枠と一体に鋳造さ
れているものであるから動かすことができず、その位置
により鉄蓋を開く方向が決まってしまう。2. Description of the Related Art For example, the opening of a manhole receiving frame is equipped with a hinge mechanism for hingedly attaching an iron lid that closes the opening, but the mounting member of the hinge fitting is cast integrally with the receiving frame. It cannot be moved, and its position determines the direction in which the iron lid is opened.
【0003】開蓋方向が決まると、マンホール内へ出入
りするための方向も決まるため、取り付け部材の位置を
どこにするかは、受枠を設置する際に考慮すべき重要事
項である。しかしその後の設置環境の変化により、開蓋
方向を変える場合、従来は受け枠を一旦外して付け変え
なければならなかった。When the lid opening direction is determined, the direction for moving in and out of the manhole is also determined. Therefore, the position of the mounting member is an important matter to be considered when installing the receiving frame. However, when changing the opening direction due to subsequent changes in the installation environment, it was conventionally necessary to remove the receiving frame and attach it again.
【0004】またマンホール開口への出入りのために補
助梯子が使用されるが、これを取り付ける取り付け口も
開口内に設けられている。この取り付け口も一体鋳造構
造であるから、その位置は受枠の設置により決まり、位
置を変更することは受枠を付け変えなければ不可能であ
る。An auxiliary ladder is used to enter and exit the manhole opening, and a mounting port for mounting the auxiliary ladder is also provided in the opening. Since this mounting port also has an integral casting structure, its position is determined by the installation of the receiving frame, and it is impossible to change the position unless the receiving frame is changed.
【0005】このように従来の地下構造物用装備品、金
具類は、その鋳造構造上の制約から、事後、位置を変え
ることができないのが通常であった。As described above, the conventional equipment and fittings for the underground structure cannot usually be changed in position after the fact due to the restrictions on the casting structure.
【0006】[0006]
【発明が解決しようとする課題】本発明は前記の点に鑑
みなされたもので、その課題とするところは、地下構造
物に設けられるヒンジ金具や補助梯子その他の取り付け
部材の取り付け位置を複数の取り付け位置の中から自由
に選択できるようにすることである。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a plurality of mounting positions of hinge fittings, auxiliary ladders and other mounting members provided in an underground structure. It is to be able to freely select from the mounting positions.
【0007】[0007]
【課題を解決するための手段】前記課題を解決するため
本発明は地下構造物の一部を装着部1とし、そこに補助
梯子やヒンジ金具その他の取り付け部材2を装着するた
めの機構について、2箇所以上の装着部1の夫々に挿し
込み操作のための挿入口3を設け、それらの挿入口3に
挿し込まれて嵌合可能な嵌合部分4を前記取り付け部材
2の一部に設け、挿入口3への嵌合部分4の嵌合により
係合し、嵌合部材4の抜け出しを防ぐ係合手段5を挿入
口3または嵌合部分4に設けるという手段を講じたもの
である。In order to solve the above-mentioned problems, the present invention relates to a mechanism for mounting a part of an underground structure as a mounting portion 1 and mounting an auxiliary ladder, hinge fittings or other mounting members 2 thereon. Insertion ports 3 for inserting operation are provided in each of the two or more mounting portions 1, and a fitting portion 4 which can be inserted into and fitted into the insertion ports 3 is provided in a part of the attachment member 2. The means for engaging the fitting portion 4 with the insertion opening 3 to prevent the fitting member 4 from slipping out is provided at the insertion opening 3 or the fitting portion 4.
【0008】前記嵌合部分4は、取り付け部材2を装着
部1の挿入口3に挿し込みにより固定する手段であり、
そのため嵌合部分4は挿入口3に挿し込まれたとき、あ
まりがたなく嵌まり合う形状、構造に形成されることが
望ましい。The fitting portion 4 is means for fixing the mounting member 2 by inserting it into the insertion opening 3 of the mounting portion 1.
Therefore, it is desirable that the fitting portion 4 is formed in a shape and structure that fits with each other when it is inserted into the insertion opening 3.
【0009】挿入口3に挿し込まれた嵌合部分4がそこ
から抜け出るのを防止するため係合手段5が設けられて
おり、その後その係合が外されるまで取り付け部材2は
確実にロックされる。Engaging means 5 is provided to prevent the fitting portion 4 inserted into the insertion opening 3 from coming out therefrom, and the mounting member 2 is securely locked until the engagement is disengaged thereafter. To be done.
【0010】挿入口3は2箇所以上設けられるが、それ
らは同一の大きさ、形状であることが望ましい。取り付
け部材2の大小に応じ、2種以上の大きさの挿入口3を
用意することは差しつかえないが、その場合にも同一の
形状、大きさのものは少なくとも2箇所ずつ設けられ
る。Two or more insertion ports 3 are provided, but it is desirable that they have the same size and shape. It is acceptable to prepare two or more types of insertion openings 3 depending on the size of the mounting member 2, but in that case as well, at least two locations having the same shape and size are provided.
【0011】[0011]
【実施例】以下図面を参照して説明する。図1乃至図5
は本発明に係る機構の実施例1、図6乃至図10は同じ
く実施例2を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings. 1 to 5
Shows a first embodiment of the mechanism according to the present invention, and FIGS. 6 to 10 show a second embodiment.
【0012】図1等に示す実施例1では、地下構造物用
枠体10の開口11の内面に装着部1が設けられてい
る。例示の装着部1A、1B、1C、1Dは枠体10と
一体の鋳造構造で良く、ほぼ等間隔で4箇所設けられ
る。In the first embodiment shown in FIG. 1 and the like, the mounting portion 1 is provided on the inner surface of the opening 11 of the frame 10 for an underground structure. The illustrated mounting portions 1A, 1B, 1C, 1D may be a casting structure integrated with the frame body 10, and are provided at four positions at substantially equal intervals.
【0013】この実施例ではヒンジ金具12と補助梯子
13が取り付け部材2として用意されている。各挿入口
3は上下貫通している方が製造上も、保守の面からも好
ましい。In this embodiment, the hinge fitting 12 and the auxiliary ladder 13 are prepared as the mounting member 2. It is preferable that each of the insertion ports 3 penetrates vertically from the viewpoint of manufacturing and maintenance.
【0014】挿入口3に挿し込まれる嵌合部分4は、挿
入口3の角穴と同形でやや小形の角材(角筒状)からな
り、ヒンジ金具12に対してはそのヒンジ開口14の側
方に配置する構成をとる。この側方配置により、ヒンジ
開口14の位置を高めず、また位置設定を自由にするこ
とができる。嵌合部分4はヒンジ開口14の部分と一体
に鋳造する。The fitting portion 4 to be inserted into the insertion opening 3 is made of a rectangular material (square tubular shape) having the same shape as that of the square hole of the insertion opening 3 and is slightly closer to the hinge metal fitting 12 than the hinge opening 14 side. It will be arranged in one direction. With this lateral arrangement, the position of the hinge opening 14 is not raised and the position can be set freely. The fitting portion 4 is cast integrally with the portion of the hinge opening 14.
【0015】補助梯子13の嵌合部分4は、梯子下端に
下向きに突出して設けられる。左右の均衡をとるため補
助梯子13の中央部に配置され、補助梯子13に対して
は溶接等により一体化した構造とする。The fitting portion 4 of the auxiliary ladder 13 is provided at the lower end of the ladder so as to project downward. It is arranged at the center of the auxiliary ladder 13 in order to balance the left and right, and the auxiliary ladder 13 has a structure integrated by welding or the like.
【0016】実施例1の場合、係合手段6の可動部は嵌
合部分4に設けられる(図2乃至図5)。このため嵌合
部分4は角筒状に形成され、その側面にあけた窓口15
から先端が出没可能なラッチ6が軸16により回動可能
に軸支されている。In the case of the first embodiment, the movable portion of the engaging means 6 is provided in the fitting portion 4 (FIGS. 2 to 5). For this reason, the fitting portion 4 is formed in a rectangular tube shape, and the window 15 opened on the side surface thereof.
A latch 6 whose tip is retractable is rotatably supported by a shaft 16.
【0017】このラッチ6は挿込口3へ嵌合部分4を挿
し込んだときに(図4)、孔内壁17により押されてラ
ッチ6を内方へ没入させるように作用する斜面6aと、
ラッチ6が挿入口3内へすっかり嵌め込まれたあと、引
き上げようとしたときに係合口7の口縁18に係合可能
な係合面6bとを先端に有している。19はラッチ下部
に設けた解除用突起で、図4中、時計方向へラッチ6を
回して係合面6bを口縁18から離脱させる。補助梯子
13の係合手段5も上記ヒンジ金具12の場合と同様に
構成することができる(図5)。The latch 6 has an inclined surface 6a which is pushed by the inner wall 17 of the hole when the fitting portion 4 is inserted into the insertion opening 3 (FIG. 4) so that the latch 6 is retracted inward.
After the latch 6 is completely fitted into the insertion opening 3, it has an engaging surface 6b capable of engaging with the rim 18 of the engaging opening 7 when trying to pull it up. Reference numeral 19 is a releasing projection provided on the lower portion of the latch, and the latch 6 is rotated clockwise in FIG. 4 to disengage the engaging surface 6b from the rim 18. The engaging means 5 of the auxiliary ladder 13 can also be configured in the same manner as the hinge fitting 12 (FIG. 5).
【0018】この実施例1の場合、ヒンジ開口14の下
端が挿入口3の上端に接したとき、或いは補助梯子13
の下端が挿入口3の上端に接したときに、ラッチ6が係
合口7と係合する。即ちヒンジ開口14と補助梯子13
の下端20がストッパ兼位置決め部になっている。In the case of the first embodiment, when the lower end of the hinge opening 14 is in contact with the upper end of the insertion opening 3, or the auxiliary ladder 13 is used.
The latch 6 engages with the engaging opening 7 when the lower end of the contacting end contacts the upper end of the insertion opening 3. That is, the hinge opening 14 and the auxiliary ladder 13
The lower end 20 of the is a stopper / positioning portion.
【0019】図6等に示す実施例2では、係合手段5を
構成するラッチ6′が挿入口3の側に設けられており、
それと係合可能な係合口7′が嵌合部分4の側面に形成
されている。そのため嵌合部材4の挿し込みによりラッ
チ6が挿入口3から外方へ押しのけられるように、斜面
6aはラッチ6の上側に設けられ、係合面6bは係合口
7の下部口縁18′と係合するようにラッチ6の下側に
設けられる(図9、図10)。In Embodiment 2 shown in FIG. 6 and the like, a latch 6'constituting the engaging means 5 is provided on the insertion port 3 side,
An engagement port 7 ′ that can be engaged with it is formed on the side surface of the fitting portion 4. Therefore, the slope 6a is provided on the upper side of the latch 6 so that the latch 6 is pushed outward from the insertion opening 3 by the insertion of the fitting member 4, and the engagement surface 6b and the lower edge 18 'of the engagement opening 7 are formed. It is provided on the lower side of the latch 6 so as to be engaged (FIGS. 9 and 10).
【0020】実施例2の場合、ラッチ6は挿入口3の側
壁に支軸21により軸支され、ラッチ6の端部は側壁に
形成された取付口22により外方へ突出しているので、
その突出端23が係合を外すための操作部となる。故に
引用例1におけるような解除用突起は不要である。In the case of the second embodiment, the latch 6 is pivotally supported by the support shaft 21 on the side wall of the insertion opening 3, and the end portion of the latch 6 is projected outward by the mounting opening 22 formed on the side wall.
The projecting end 23 serves as an operating portion for disengaging. Therefore, the releasing projection as in the reference example 1 is unnecessary.
【0021】他の構成は実施例1と同様で良いので符号
を援用し、詳細な説明を略す。実施例1、2の各図中、
24は装着部1の側方にのびた延長部で、ヒンジ金具1
2、補助梯子13の下端20が当接可能な部分である。
なお、以上の例では1個の取り付け部材2について、1
組の装着機構を用いる場合のみを説明したが、これは絶
対的な条件ではなく、2組の装着機構を用いる構成であ
っても良い。Since the other structure may be the same as that of the first embodiment, the reference numerals are used and the detailed description is omitted. In each figure of Examples 1 and 2,
Numeral 24 is an extension extending to the side of the mounting portion 1, which is the hinge fitting 1
2. The lower end 20 of the auxiliary ladder 13 can come into contact with it.
In the above example, for one mounting member 2, 1
Although only the case of using a pair of mounting mechanisms has been described, this is not an absolute condition, and a configuration using two sets of mounting mechanisms may be used.
【0022】また、4箇所の装着部1A、1B、1C、
1Dの挿入口3は、大きさ、形状がすべて同一であるこ
とを前提として説明した。この場合、多数の挿入口3が
全部ヒンジ金具12、補助梯子13の取り付けのために
使用可能であるから選択の幅が広い。The four mounting parts 1A, 1B, 1C,
The 1D insertion port 3 has been described on the assumption that the size and the shape are all the same. In this case, since a large number of insertion ports 3 can all be used for attaching the hinge fitting 12 and the auxiliary ladder 13, the selection range is wide.
【0023】上述のように構成された本発明に係る装着
機構の挿入口3は、例えば図11に示されるように、枠
体11の開口12の4方に設けられているので、それら
の装着部1A、1B、1C、1Dのいずれかにヒンジ金
具12を装着し、また残る装着部1A、1B、1C、1
Dのいずれかに補助梯子13を装着することができる
(図12参照)。The insertion opening 3 of the mounting mechanism according to the present invention constructed as described above is provided on four sides of the opening 12 of the frame 11 as shown in FIG. The hinge fitting 12 is mounted on any of the parts 1A, 1B, 1C, 1D, and the remaining mounting parts 1A, 1B, 1C, 1
The auxiliary ladder 13 can be attached to any of D (see FIG. 12).
【0024】また、ヒンジ金具12の取り付け位置を、
装着部1Aを選択して使用中、周囲の状況の変化により
開蓋方向が適切でなくなった場合、他の装着部1B、1
C、1Dに付け変えることができる。その場合、補助梯
子13の取り付け位置もいずれかの装着部に変えられる
ので、マンホールへの出入りに際して最適の位置を選ぶ
ことができる。Further, the mounting position of the hinge fitting 12 is
When the mounting portion 1A is selected and used, if the lid opening direction is not appropriate due to changes in surrounding conditions, the other mounting portions 1B, 1
It can be changed to C or 1D. In this case, the mounting position of the auxiliary ladder 13 can be changed to any mounting portion, so that the optimum position can be selected when entering or leaving the manhole.
【0025】なお、4箇所の装着部を2箇所ずつ2組に
分け、例えば対向位置にある1組の装着部1A、1Bは
ヒンジ金具用、他の1組の装着部1C、1Dは補助梯子
用に使用されるように構成することもできる。その場
合、ヒンジ金具用装着部1A、1Bの挿入口3は、補助
梯子用装着部1C、1Dの挿入口3よりも小形でも良
い。いずれの場合でも、装着部1の数と方向は任意に設
定することができる。The four mounting portions are divided into two sets each having two mounting portions. For example, one pair of mounting portions 1A and 1B at the opposite positions are for hinge fittings, and the other pair of mounting portions 1C and 1D are auxiliary ladders. Can also be configured to be used for. In that case, the insertion opening 3 of the hinge fitting mounting portions 1A and 1B may be smaller than the insertion opening 3 of the auxiliary ladder mounting portions 1C and 1D. In any case, the number and direction of the mounting portions 1 can be set arbitrarily.
【0026】[0026]
【発明の効果】従って本発明によれば、地下構造物の枠
体などに装備される取り付け部材2の位置を適宜変更可
能であるから、枠体等を一旦設置した後も、それを付け
変えることなくヒンジ金具の位置を変更可能であり、蓋
体の開閉方向を常に好適な位置に向けることができ、ま
たそれに合わせて変えることが望ましい補助梯子の位置
も変向することができるから、使用上の問題をなくし、
かつまた安全性も高められるなど顕著な効果を奏する。Therefore, according to the present invention, the position of the mounting member 2 mounted on the frame of the underground structure or the like can be changed appropriately, so that even after the frame or the like is once installed, it is replaced. Without changing the position of the hinge metal fittings, the opening and closing direction of the lid can always be directed to a suitable position, and the position of the auxiliary ladder, which should be changed accordingly, can also be changed. Eliminate the above problem,
In addition, it also has a remarkable effect such as increased safety.
【図1】本発明に係る装着機構の実施例1を示す分解斜
視図。FIG. 1 is an exploded perspective view showing a first embodiment of a mounting mechanism according to the present invention.
【図2】同上要部の一部省略平面図。FIG. 2 is a partially omitted plan view of an essential part of the same.
【図3】同上要部の一部破断側面図。FIG. 3 is a partially cutaway side view of the main part of the same.
【図4】同じく要部拡大断面図。FIG. 4 is an enlarged cross-sectional view of the same main part.
【図5】同様の拡大断面図。FIG. 5 is a similar enlarged sectional view.
【図6】前記装着機構の実施例2を示す分解斜視図。FIG. 6 is an exploded perspective view showing a second embodiment of the mounting mechanism.
【図7】同上要部の一部省略平面図。FIG. 7 is a partially omitted plan view of the same as above.
【図8】同上要部の一部破断側面図。FIG. 8 is a partially cutaway side view of the essential part of the same.
【図9】同じく要部拡大断面図。FIG. 9 is an enlarged sectional view of the same main part.
【図10】同様の拡大断面図。FIG. 10 is a similar enlarged sectional view.
【図11】本発明の作用を説明する平面図。FIG. 11 is a plan view illustrating the operation of the present invention.
【図12】同じく断面説明図。FIG. 12 is a sectional explanatory view of the same.
Claims (5)
に補助梯子やヒンジ金具その他の取り付け部材2を装着
するための機構であって、2箇所以上の前記装着部1の
夫々に挿し込み操作のための挿入口3を設け、それらの
挿入口3に挿し込まれて嵌合可能な嵌合部分4を前記取
り付け部材2の一部に設け、挿入口3への嵌合部分4の
嵌合により係合し、嵌合部材4の抜け出しを防ぐ係合手
段5を挿入口3または嵌合部分4に設けたことを特徴と
する地下構造物用装備品、金具類の装着機構。1. A mechanism for mounting a part of an underground structure as a mounting portion 1 and mounting a mounting member 2 such as an auxiliary ladder, a hinge metal fitting, or the like on each of the mounting portions 1 at two or more locations. Insertion ports 3 for inserting operation are provided, and a fitting portion 4 which is inserted into the insertion ports 3 and can be fitted is provided in a part of the mounting member 2, and a fitting portion 4 into the insertion port 3 is provided. The fitting mechanism 5 for engaging underground fittings and fittings for preventing the fitting member 4 from slipping out is provided in the insertion opening 3 or the fitting portion 4.
はその角穴と同形でやや小形の角材からなり、係合手段
5として挿し込み方向と平行な嵌合部分4の側面に出没
可能なラッチ6が取り付けられ、そのラッチ6と係合可
能な係合口7が挿入口3の側壁に形成されている請求項
第1項記載の地下構造物用装備品、金具類の装着機構。2. The insertion opening 3 is a square hole in the vertical direction, and a fitting portion 4
Is made of a small square member having the same shape as that of the square hole, and a latch 6 that can be retracted is attached to the side surface of the fitting portion 4 that is parallel to the inserting direction as the engaging means 5, and the engaging member that can engage with the latch 6 is attached. The fitting mechanism for the underground structure equipment and fittings according to claim 1, wherein the joint opening 7 is formed on the side wall of the insertion opening 3.
に係合口7′が形成され、その係合口7′と係合可能な
ラッチ6′が挿入口3内へ出没可能に挿入口3側に設け
られている請求項第1項記載の地下構造物用装備品、金
具類の装着機構。3. An engagement opening 7'is formed on a side surface of a fitting portion 4 parallel to the insertion direction, and a latch 6'engageable with the engagement opening 7'is inserted into and retracted from the insertion opening 3. The mounting mechanism for equipment and fittings for an underground structure according to claim 1, which is provided on the third side.
分4の挿し込みにより口内壁に押されて嵌合部分4内へ
没入するための斜面6aと、挿入口3からの引き上げに
より係合口7、7′の口縁に係合可能な係合面6bとを
有する請求項第2項または第3項記載の地下構造物用装
備品、金具類の装着機構。4. Latches 6 and 6 ′ are pushed from the inner wall of the mouth by inserting the fitting portion 4 into the insertion opening 3 and are slanted into the fitting portion 4, and the slant surface 6a from the insertion opening 3 is inserted. 4. The equipment for mounting an underground structure according to claim 2 or 3, which has an engaging surface 6b which can be engaged with the edges of the engaging openings 7 and 7'by pulling up.
7′と係合する方向へ傾斜するように嵌合部分4または
挿入口3部分に軸支されている請求項第2項または第3
項記載の地下構造物用装備品、金具類の装着機構。5. The latches 6, 6'in the natural state are the engaging ports 7,
The second or third aspect of the present invention is pivotally supported by the fitting portion 4 or the insertion opening 3 so as to be inclined in the direction of engaging with 7 '.
The attachment mechanism for the equipment and metal fittings for the underground structure described in paragraph.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4231325A JPH0751794B2 (en) | 1992-08-06 | 1992-08-06 | Attachment mechanism for equipment and metal fittings for underground structures |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4231325A JPH0751794B2 (en) | 1992-08-06 | 1992-08-06 | Attachment mechanism for equipment and metal fittings for underground structures |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0657771A true JPH0657771A (en) | 1994-03-01 |
JPH0751794B2 JPH0751794B2 (en) | 1995-06-05 |
Family
ID=16921869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4231325A Expired - Fee Related JPH0751794B2 (en) | 1992-08-06 | 1992-08-06 | Attachment mechanism for equipment and metal fittings for underground structures |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0751794B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7516986B2 (en) | 2004-05-21 | 2009-04-14 | Showa Denko K.K. | Steering support beam |
GB2493402A (en) * | 2011-07-25 | 2013-02-06 | Terence Michael Murray | Portable safe entry and exit system for manholes or the like |
-
1992
- 1992-08-06 JP JP4231325A patent/JPH0751794B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7516986B2 (en) | 2004-05-21 | 2009-04-14 | Showa Denko K.K. | Steering support beam |
GB2493402A (en) * | 2011-07-25 | 2013-02-06 | Terence Michael Murray | Portable safe entry and exit system for manholes or the like |
GB2493402B (en) * | 2011-07-25 | 2016-04-06 | Terence Michael Murray | Portable manhole, vault, or man-way safe entry/exit system |
Also Published As
Publication number | Publication date |
---|---|
JPH0751794B2 (en) | 1995-06-05 |
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