JP4521998B2

JP4521998B2 - Opening and closing structure of lid for underground structure

Info

Publication number: JP4521998B2
Application number: JP2001015988A
Authority: JP
Inventors: 智信畠
Original assignee: Kogi Corp
Current assignee: Kogi Corp
Priority date: 2001-01-24
Filing date: 2001-01-24
Publication date: 2010-08-11
Anticipated expiration: 2021-01-24
Also published as: JP2002220847A

Description

【０００１】
【発明の属する技術分野】
本発明は、地下構造物用蓋、例えば、ＣＣボックス蓋、情報ボックス蓋、丸蓋、角蓋等の開閉構造に関し、主に蝶番部の構造に関する。
【０００２】
【従来の技術】
従来の地下構造物用の蓋には、開蓋操作時に支点となるものがなく、蓋の全重量を作業者が支えなければならないものがある。大型の地下構造物用の蓋では、一人の作業者での開蓋作業は難しく、二人若しくは専用の機械を必要とする場合が多い。このようなことから、実公平５−１００３４号公報、特開２０００−２２０１６２号公報等に開示されたものが実用化されている。前者は、蝶番の上端が球体に形成されて支持され、下部が支持口に進退可能に挿入され、開蓋作業時に蝶番が受枠側の支持口に下部の側面でのみ接しており、蓋の重量を支えるには蝶番を屈曲した長いものに形成しなければならない構成になっている。後者は、蝶番金物の球体に形成された一端を蓋に球面受溝で支持し、他端を受枠側に軸支持してあり、蝶番の起立状態で蓋が受枠より上に浮揚させて支持される構成であり、蓋の厚さが大きくなると蝶番金物が長くなり、受枠側の蝶番金物の支持部が内側に突出する量がおおきくなり、更に寝た状態の蝶番金物を起立状態とするための、つまり引き起こすための力が非常に大きくなる。
【０００３】
【発明が解決しようとする課題】
前記従来の下部が屈曲した蝶番金物を用いる構成のものは、蝶番金物が長くなり閉蓋状態で下方への突出量が大きくなるから商品価値に問題があり、短くすると開蓋途中で蓋を支える支持作用がなくなるから作業者が常に蝶番金物と反対側の蓋縁部を蝶番金物側から離れる方向に引き寄せた状態を維持しながら水平旋回させなければならない問題がある。蝶番金物を起立させる構成のものは蓋の厚さが大きいもの、つまり重いものほど蝶番回動半径が大きくなって開蓋操作に大きな力を必要とし、受枠側の蝶番支持部の突出量も大きくなってその分開口域が狭くなり、蝶番の回動半径を短くすると起立状態としても蓋が受枠上端よりも上側に浮揚せず、開蓋不可能になる問題がある。
本発明は、蝶番金物の長さをそれほど長くすることなく、厚さの大きい蓋に適用しても比較的小さい力で開蓋操作できる地下構造物用蓋の開閉構造を提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明の手段は、開口を形成する受枠とその開口を閉じる蓋とを備え、前記蓋の縁部内側付近に第１支点を設け、閉蓋状態の前記蓋の第１支点位置よりも前記開口の内側で且つ下方の位置に第２支点を受枠側に設け、前記第１支点と第２支点とを蝶番金物で連結してなり、前記蝶番金物は、前記第１支点と第２支点とが閉蓋状態の支点間距離よりも接近することに対抗し、前記第１支点と蝶番金物の連結は、蝶番金物が第１支点を上側にして略直立した状態で前記蓋の水平面内の旋回を可能とし、前記第２支点と蝶番金物の連結は、第１支点が第２支点から離れる方向の蝶番金物の変位を許容し、前記閉蓋状態の第１支点と第２支点との支点間距離は、第１支点が第２支点のほぼ上側に位置し蓋が閉蓋位置よりも少し高く且つ蓋全体が受け枠上端位置から完全には上に出ていないように持ち上げられた位置にある時の支点間距離とした構成であることを特徴とする。
【０００５】
この手段では、開蓋操作は、蓋の第１支点側と反対側の縁部を受枠上端面より少し高く持ち上げてから、第２支点から離れる方向に移動させることにより、蝶番金物が第２支点を中心に閉蓋状態の第１、第２支点間距離である所定の半径で回動して第１支点が上昇し、蝶番金物が略直立した状態にでき、蓋の持ち上げた側の端縁部下面が受枠上端面上側に位置するようになる。この状態で蓋の第１支点側縁部下面が受枠の上端面よりも低い位置にあるが、蓋全体を何らかの方法で、例えば、第１支点を中心に蓋を水平旋回させて受枠上端面と同じ高さの地面上に位置させたとすると、第２支点と蝶番金物の連結部が蝶番金物の変位を許容するから、つまり支点間距離が長くなるような変位を許容するから、問題なく開蓋できる。これは、第１支点と第２支点との間の距離を短くしても開蓋できる構成である。第１、第２支点間距離を短くできるから、蝶番金物を直立状態に起立させるときその分小さい力で操作できる。蝶番金物の全長もあまり長くはならない。
【０００６】
前記手段において、前記第２支点が、水平軸で形成され、蝶番金物が、長手方向に沿った長穴を有し前記水平軸が挿入されている構成とするのがよい。この構成では、開蓋操作の際に蝶番金物が起立させられるときに長穴の一方の端に水平軸が当接して第１、第２支点間の距離を保って回動し、更に蓋が持ち上げられるときに長穴の他端が水平軸に当接するまで蓋の上昇変位を許容する。蝶番金物の起立は水平軸の外周に、長穴の端部の円弧状内周面が当接して回動するから、滑らかな回動であり、しかも長穴であるから確実に蓋の上昇変位を許容できる。
【０００７】
前記手段において、前記第１支点と蝶番金物の連結部は、蝶番金物の端部がラグビーボール状の頭部を横にしてＴ字形をなすように軸状の首部を連続させた形状に形成され、第１支点が前記頭部に対し旋回可能に頭部を保持している構成とするのがよい。この構成では、頭部が球体である構成のものよりも高さを低く形成できるから、その保持のために蓋の縁部の厚さが必要以上に大きくなることを防止できる。
【０００８】
【発明の実施の形態】
本発明の一実施の形態を、図１〜図４を用いて説明する。この実施の形態の、地下構造物用の蓋開閉構造は、略長方形の角蓋が受枠に１個の蝶番金物を介して開閉可能に連結されている構成のもので、図示のように、蓋１、受枠２、第１支点３、第２支点４、蝶番金物５等で構成されている。
【０００９】
蓋１は、鋳鉄製のもので、長方形の上面壁の周辺から下方へ突出する外周縁部１０が所定の高さで形成され、下面に格子状に設けられた縦、横の補強リブ１１、１２を有している。補強リブ１１、１２は、蓋中央部で高さが高く、つまり下方への突出量が大きく、蓋周辺に向かって傾斜して周辺で高さが低く、つまり下方への突出量が小さくなっている。この長方形の蓋１は一方の端縁中間部の下面に第１支点３が設けられている。
【００１０】
受枠２は、鋳鉄製であり、蓋１の外周縁部１０が嵌りこむ縁部１３と、その下端から内側へ突出しその内側空間が開口１４とされた受部１５とをを有し、この他に地中に埋設固定するための縁部１３の下方延長部１６やこれに設けたフランジ部１７等を有する。開口１４を閉じるように蓋１を装着した状態を図１に示す。この状態で蓋１は外周縁部１０の下端を受け部１５に支持され、上面が受枠２の縁部１３上端に一致している。この受枠２の開口１４を閉じた蓋１の第１支点３下側に、直下よりも開口１４の中心側に離れた位置に、第２支点４が設けられている。
【００１１】
第１支点３は、蓋１の外周縁部１０内側に、蓋１下面部分と蓋１と一体に設けた箱状の包囲壁１８とで空洞１９を形成され、その空洞１９内側の面で形成されている。この第１支点３は後述する蝶番金物５の頭部２４を保持し、蓋１が旋回できるように構成されている。包囲壁１８には蝶番金物５の首部２５が通り抜ける溝状の切れ目２０と、頭部２４の挿入口２１とを設けてあり、挿入口２１には脱出止めのピン３２を設けてある。
【００１２】
第２支点４は、長方形の受枠２の第２支点を設けてある縁部１３の辺に平行な水平軸２２を受枠２側に支持したもので、受枠２の受部１５下側付近から開口１４の中心側に向かって平行な２部分からなる支持アーム２３を突設し、その支持アーム２３の先端の２部分間に水平軸２２を固定してある。この水平軸２２には固定及び取外し可能なボルト及びナットが用いられている。閉蓋状態にあるときのこの第２支点４と前記第１支点３との距離は、第１支点３が第２支点４のほぼ上側に位置するように蓋１が閉蓋位置よりも少し高く且つ蓋１全体が受枠２上端位置から完全には上に出ていないように持ち上げられた位置にある時の第１、第２支点３、４間の距離としてある。この場合の第１、第２支点３、４間の距離は、大きくなるとアーム２３の突出量が大きくなる。
【００１３】
蝶番金物５は、次のように構成され、第１支点３と第２支点４とを連結している。蝶番金物５は、図４に拡大して示すように、前記第１支点３の包囲壁１８内に収容されるラグビーボール状の頭部２４と、その頭部２４を横長にしてＴ字形となるように中間位置から下方に首部２５を連続させ、更に首部２５に続いて丸棒状の軸部２６を伸延させ、頭部２４の横方向中心軸線に平行な方向に穿設された長穴２７を有する部分２８を、下方に連続させて形成したものである。
【００１４】
この蝶番金物５は、図示のように、第１支点３を構成する前記空洞１９内面に頭部２４を保持され、長穴２７内に第２支点４である前記水平軸２２を挿通した状態に組み付けられる。長穴２７の短径方向の寸法は前記水平軸２２を摺動可能に挿入できる大きさである。長穴２７の長径方向の寸法は前記第１、第２支点３、４間の寸法や、蓋１の厚さ寸法に基づいて決められ、蝶番金物５を組み付けた状態で、閉蓋状態の蓋１を持ち上げて蓋１全体が受枠２の縁部１３上端面よりもやや高くなる位置に持ち上げられる程度に決められている。つまり、蓋１全体を水平な状態で上方に持ち上げると、水平軸２２が長穴２７の下端に当接してそれ以上に持ち上げることはできない状態となるが、その状態で蓋１全体が受枠２の上端面よりも少し上側に位置するように決めてある。また、この蝶番金物５は、第１支点３と第２支点４とが近寄るような方向の作用力を受けたときに、頭部２４と長穴２７の上端部位置との間隔寸法に支点間寸法を規制する。
【００１５】
また、この蝶番金物５と水平軸２２支持部であるアーム２３の先端部とには、組み付けられた蝶番金物５が図２に示すように頭部２４を上側にして略直立状態にまで回動したときに、互いに当接してその状態以上に回動することを規制するストッパー２９、３０を設けてある。このストッパー２９、３０が作用した状態は、第１支点３が第２支点４の真上よりもやや開口１４の中心側にあって、蓋１の重量によってストッパー２９、３０が押合う方向の分力を生じるようになっており、外力を作用させない状態でその位置に維持される。
【００１６】
このように構成された蓋の開閉構造では、開蓋操作は、図１に示す閉蓋状態から、作業者が蓋１の第１支点３側と反対側の縁部を受枠２の上端面より少し高く持ち上げてから、第２支点から離れる方向に引っ張ることにより図２に示す状態に移動させて、持ち上げた付近を受枠２の縁部１３上端面に載せ、次に蓋１を、第１支点３を中心に、図３に示す状態を経て、略水平に１８０°程度旋回させればよい。
【００１７】
この過程を説明すると、第２支点から離れる方向に移動させることにより、第１支点３が移動し、このとき蝶番金物５は、第１、第２支点３、４間距離を保って第２支点４を中心に回動して斜め横に寝た状態から起こされて直立状態を越えて少しだけ傾いた起立状態になり、ストッパー２９、３０が当接してその位置に止まる。蝶番金物５を起立状態にするための引張力は、このときの第１、第２支点間距離を比較的小さくしてあるので小さい力でよい。蝶番金物５が起立して止まった状態は作業者が手を放しても、つまり外力を与えなくてもそのまま維持される。そして、１８０°くらい蓋１を旋回させることにより、その過程で蓋下面の補強リブ１１又は１２の下端縁が受枠２の上端縁内側に当接して滑りながら移動し、リブが傾斜していることにより蓋１は旋回に伴って徐々に持ち上げられて地表面に載り旋回の終わり付近で全開状態になる。蓋１が地表面に載る状態に持ち上げられる際に、第１、第２支点３、４間距離が大きくなるが、蝶番金物５の長穴２７がこれを許容するから、確実に開蓋する。
【００１８】
また、蝶番金物５の頭部をラグビーボール状とした構成は、球体とする場合に比べて高さを低くできるから、第１支点３を構成する空洞１９の高さを小さくでき、従って蓋１の縁部の厚さは空洞１９を形成するために必要以上に大きくしなくてもよい。
【００１９】
以上のように、この地下構造物用蓋の開閉構造は、蝶番金物の長さをあまり長く形成しなくてもよいから商品価値に悪影響を与えることがなく、蝶番金物を斜め横に寝た状態から起立状態とするための操作に要する力が小さくてよいから操作性がよい。
【００２０】
【発明の効果】
請求項１に記載の発明は、開蓋操作初期（蓋を水平旋回させる前の段階）の少し持ち上げた状態とするときに、蓋全体を受け枠上端面から完全には上に出ていないように上昇させる構成であるので、第１、第２支点間距離を短くできるから、蝶番金物を直立状態に起立させるときの力が小さく、小さい力で開蓋操作でき、従って操作性がよくなり、第２支点の支持アームの突出量を小さくできてその分開口域を大きくできる等の効果を奏する。
請求項２に記載の発明は、蝶番金物の起立が滑らかな回動であり、しかも長穴であるから確実に蓋の上昇変位を許容でき、操作性がよくなる効果を奏する。
請求項３に記載の発明は、蓋の縁部の厚さが必要以上に大きくなることを防止できる効果を奏する。
【図面の簡単な説明】
【図１】本発明の一実施形態の閉蓋状態を示し、（ａ）は平面図、（ｂ）は縦断正面図、（ｃ）は（ｂ）の部分拡大図である。
【図２】同実施の形態の蝶番金物が起立した段階の開蓋途中の状態を示し、（ａ）は平面図、（ｂ）は縦断正面図、（ｃ）は（ｂ）の部分拡大図である。
【図３】同実施の形態の蓋が水平旋回の途中にある開蓋途中の状態を示し、（ａ）は平面図、（ｂ）は縦断正面図、（ｃ）は（ｂ）の部分拡大図である。
【図４】同実施の形態の蝶番金物を示し、（ａ）は正面図、（ｂ）は右側面図である。
【符号の説明】
１蓋
２受枠
３第１支点
４第２支点
５蝶番金物
１０外周縁部
１１、１２補強リブ
１３縁部
１４開口
１５受部
１６下方延長部
１７フランジ部
１８包囲壁
１９空洞
２０切れ目
２１挿入口
２２水平軸
２３支持アーム
２４頭部
２５首部
２６軸部
２７長穴
２８部分
２９、３０ストッパー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an open / close structure for an underground structure lid, for example, a CC box lid, an information box lid, a round lid, a square lid, and the like, and mainly relates to a hinge part structure.
[0002]
[Prior art]
Some conventional lids for underground structures do not serve as fulcrums during the opening operation, and some require the operator to support the total weight of the lid. With a lid for a large underground structure, it is difficult for one worker to open the lid, and two people or a dedicated machine are often required. For these reasons, those disclosed in Japanese Utility Model Publication No. 5-10034, Japanese Patent Application Laid-Open No. 2000-220162, and the like have been put into practical use. In the former, the upper end of the hinge is formed in a sphere and supported, and the lower part is inserted into the support port so that it can move forward and backward, and the hinge is in contact with the support port on the receiving frame side only at the lower side during the lid opening operation, and the weight of the lid To support it, it has a structure that must be formed into a long bent hinge. In the latter, one end formed on the sphere of the hinge hardware is supported on the lid by a spherical receiving groove, and the other end is axially supported on the receiving frame side, and the lid is supported by floating above the receiving frame in the standing state of the hinge. As the thickness of the lid increases, the hinge hardware becomes longer, the amount of the support part of the hinge hardware on the receiving frame side protruding inward is increased, and the hinge hardware in the sleeping state is further raised. That is, the power to cause it becomes very large.
[0003]
[Problems to be solved by the invention]
The conventional structure using the hinge hardware with the bent lower part has a problem in commercial value because the hinge metal article becomes long and the amount of protrusion downward becomes large in the closed state, and if it is shortened, the lid is supported in the middle of opening the lid. Since the supporting action is lost, there is a problem that the operator must always turn horizontally while maintaining the state in which the lid edge on the side opposite to the hinge hardware is pulled away from the hinge hardware side. In the structure where the hinge hardware is erected, the thicker the cover, that is, the heavier the one, the larger the hinge turning radius and the greater the force required to open the lid, and the larger the protrusion of the hinge support on the receiving frame side. Accordingly, the opening area is narrowed accordingly, and if the pivoting radius of the hinge is shortened, there is a problem that the lid does not float above the upper end of the receiving frame and cannot be opened even in the standing state.
An object of the present invention is to provide an open / close structure of a lid for an underground structure that can be opened and closed with a relatively small force even when applied to a lid having a large thickness without lengthening the hinge hardware so much. To do.
[0004]
[Means for Solving the Problems]
The means of the present invention includes a receiving frame that forms an opening and a lid that closes the opening, and a first fulcrum is provided in the vicinity of the inside of the edge of the lid, and the opening is located more than the first fulcrum position of the lid in the closed state. provided for and second fulcrum position below inside the receiving frame side, with a first fulcrum and the second fulcrum and hinged fittings, said hinge fittings, it said first fulcrum and the second fulcrum against that contact near than the distance between fulcrums of lid closed, the coupling of the first pivot and the hinge fittings are turning in a state where the hinge fittings is substantially upright with a first supporting point above the horizontal plane of the lid and enabling said second connection fulcrum and hinge fittings are first fulcrum displacement direction of hinge hardware away from the second fulcrum and allowable, the fulcrum of the first pivot and the second pivot point of the lid closed The distance between the first fulcrum is almost above the second fulcrum, the lid is slightly higher than the closed position, and the entire lid is the receiving frame. Characterized in that the full from the end position is a configuration in which a distance between supporting points when in the not do so elevated position out on top.
[0005]
In this means, the lid opening operation is performed by lifting the edge of the lid opposite to the first fulcrum side slightly higher than the upper end surface of the receiving frame and then moving it in a direction away from the second fulcrum, so that the hinge hardware is moved to the second fulcrum. The first fulcrum is lifted by turning at a predetermined radius that is the distance between the first and second fulcrum in the closed state with the hinge being at the center , and the hinge hardware can be made substantially upright. The lower surface of the part is positioned above the upper end surface of the receiving frame. In this state, the lower surface of the first fulcrum side edge of the lid is at a position lower than the upper end surface of the receiving frame. For example, the lid is horizontally swiveled around the first fulcrum by some method, If it is located on the ground at the same height, the connecting part of the second fulcrum and the hinge hardware allows the displacement of the hinge metal, that is, the displacement that increases the distance between the fulcrums is allowed. it can. This is a structure that can be opened even if the distance between the first fulcrum and the second fulcrum is shortened. Since the distance between the first and second fulcrums can be shortened, the hinge hardware can be operated with a smaller force when it is raised upright. The overall length of the hinge hardware should not be too long.
[0006]
In the above means, the second fulcrum may be formed by a horizontal axis, and the hinge may have a long hole along the longitudinal direction and the horizontal axis may be inserted. In this configuration, when the hinge is raised during the lid opening operation, the horizontal shaft comes into contact with one end of the elongated hole and rotates while maintaining the distance between the first and second fulcrums, and the lid further Allow the lid to move up until the other end of the slot abuts the horizontal axis when lifted. The hinge metal stand rises and rotates smoothly because the arcuate inner peripheral surface of the end of the long hole is in contact with the outer periphery of the horizontal shaft, and it is a long hole. Is acceptable.
[0007]
In the above-mentioned means, the connecting portion between the first fulcrum and the hinge hardware is formed in a shape in which an axial neck is continuous so that the end of the hinge hardware forms a T shape with the rugby ball-shaped head sideways. The first fulcrum may be configured to hold the head so as to be able to turn with respect to the head. In this configuration, the height can be formed lower than that of the configuration in which the head is a sphere, so that the thickness of the edge of the lid can be prevented from becoming larger than necessary for the holding.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. The lid opening / closing structure for an underground structure according to this embodiment has a configuration in which a substantially rectangular square lid is connected to a receiving frame so as to be opened / closed via a single hinge. 1, receiving frame 2, first fulcrum 3, second fulcrum 4, hinge hardware 5, and the like.
[0009]
The lid 1 is made of cast iron, and an outer peripheral edge 10 protruding downward from the periphery of the rectangular upper wall is formed at a predetermined height, and vertical and horizontal reinforcing ribs 11 provided in a lattice shape on the lower surface. 12. The reinforcing ribs 11 and 12 have a high height at the center of the lid, that is, a large amount of protrusion downward, and are inclined toward the periphery of the lid and have a low height at the periphery, that is, the amount of protrusion downward is small. Yes. The rectangular lid 1 is provided with a first fulcrum 3 on the lower surface of one end edge intermediate portion.
[0010]
The receiving frame 2 is made of cast iron, and has an edge portion 13 into which the outer peripheral edge portion 10 of the lid 1 is fitted, and a receiving portion 15 that protrudes inward from the lower end thereof and has an inner space as an opening 14. The lower extension 16 of the edge 13 and the flange 17 provided on the edge 13 are fixed to the ground. A state in which the lid 1 is mounted so as to close the opening 14 is shown in FIG. In this state, the lid 1 is supported by the receiving portion 15 at the lower end of the outer peripheral edge portion 10, and the upper surface coincides with the upper end of the edge portion 13 of the receiving frame 2. A second fulcrum 4 is provided on the lower side of the first fulcrum 3 of the lid 1 with the opening 14 of the receiving frame 2 closed, at a position farther from the center side of the opening 14 than immediately below.
[0011]
The first fulcrum 3 has a cavity 19 formed inside the outer peripheral edge 10 of the lid 1 by a lower surface portion of the lid 1 and a box-shaped surrounding wall 18 provided integrally with the lid 1, and is formed by a surface inside the cavity 19. Has been. The first fulcrum 3 is configured so as to hold a head 24 of a hinge 5 described later and to allow the lid 1 to turn. The surrounding wall 18 is provided with a groove-like cut 20 through which the neck portion 25 of the hinge 5 passes, and an insertion port 21 of the head 24, and a pin 32 for preventing escape is provided in the insertion port 21.
[0012]
The second fulcrum 4 supports a horizontal axis 22 parallel to the side of the edge 13 where the second fulcrum of the rectangular receiving frame 2 is provided on the receiving frame 2 side, and is opened from the lower side of the receiving portion 15 of the receiving frame 2. A support arm 23 consisting of two parts parallel to the center side of 14 is provided so as to project, and a horizontal shaft 22 is fixed between the two parts at the tip of the support arm 23. The horizontal shaft 22 uses bolts and nuts that can be fixed and removed. The distance between the second fulcrum 4 and the first fulcrum 3 in the closed state is slightly higher than the closed position so that the first fulcrum 3 is located substantially above the second fulcrum 4. In addition, the distance between the first and second fulcrums 3 and 4 when the entire lid 1 is in a lifted position so that it does not completely come out from the upper end position of the receiving frame 2. In this case, as the distance between the first and second fulcrums 3 and 4 increases, the protruding amount of the arm 23 increases.
[0013]
The hinge hardware 5 is configured as follows, and connects the first fulcrum 3 and the second fulcrum 4. As shown in an enlarged view in FIG. 4, the hinge hardware 5 has a rugby ball-like head 24 accommodated in the surrounding wall 18 of the first fulcrum 3 and a T-shape with the head 24 being horizontally long. In this way, the neck portion 25 is continued downward from the intermediate position, and further, the round rod-shaped shaft portion 26 is extended following the neck portion 25, and a long hole 27 drilled in a direction parallel to the lateral central axis of the head portion 24 is formed. The part 28 having this is formed continuously downward.
[0014]
As shown in the figure, the hinge 5 is such that the head 24 is held on the inner surface of the cavity 19 constituting the first fulcrum 3 and the horizontal shaft 22 that is the second fulcrum 4 is inserted into the long hole 27. Assembled. The dimension of the long hole 27 in the short diameter direction is a size that allows the horizontal shaft 22 to be slidably inserted. The dimension of the long hole 27 in the major axis direction is determined based on the dimension between the first and second fulcrum points 3 and 4 and the thickness dimension of the lid 1. 1 is lifted so that the entire lid 1 can be lifted to a position slightly higher than the upper end surface of the edge 13 of the receiving frame 2. That is, when the entire lid 1 is lifted upward in a horizontal state, the horizontal shaft 22 comes into contact with the lower end of the elongated hole 27 and cannot be lifted further. It is determined to be located slightly above the upper end surface. Further, when the hinge 5 is subjected to an acting force in such a direction that the first fulcrum 3 and the second fulcrum 4 approach each other, the distance between the head 24 and the position of the upper end of the elongated hole 27 is set between the fulcrums. Regulate dimensions.
[0015]
In addition, the hinge 5 attached to the hinge 5 and the tip of the arm 23 which is the support portion of the horizontal shaft 22 is rotated to a substantially upright state with the head 24 as shown in FIG. In this case, stoppers 29 and 30 are provided for restricting contact with each other and turning beyond that state. The state in which the stoppers 29 and 30 are actuated is such that the first fulcrum 3 is slightly closer to the center of the opening 14 than just above the second fulcrum 4 and the stoppers 29 and 30 are pressed by the weight of the lid 1. A force is generated, and the position is maintained in a state where no external force is applied.
[0016]
In the lid opening / closing structure configured as described above, the opening operation is performed by the operator from the upper end surface of the receiving frame 2 with the edge of the lid 1 opposite to the first fulcrum 3 side from the closed state shown in FIG. After lifting it slightly higher, pulling it away from the second fulcrum moves it to the state shown in FIG. 2 and places the raised vicinity on the upper end surface of the edge 13 of the receiving frame 2, and then puts the lid 1 on the first fulcrum 3 may be rotated about 180 ° substantially horizontally through the state shown in FIG.
[0017]
Explaining this process, the first fulcrum 3 is moved by moving in a direction away from the second fulcrum. At this time, the hinge hardware 5 keeps the distance between the first fulcrum 3 and the second fulcrum 3 and the second fulcrum. 4, it is raised from a state where it is slanted on its side and is tilted slightly beyond the upright state, and the stoppers 29 and 30 come into contact with each other and stop at that position. Since the distance between the first and second fulcrums at this time is relatively small, the tensile force for bringing the hinge 5 into the upright state may be small. The state in which the hinge 5 is raised and stopped is maintained as it is even if the operator releases the hand, that is, without applying external force. Then, by rotating the lid 1 by about 180 °, the lower end edge of the reinforcing rib 11 or 12 on the lower surface of the lid moves in contact with the inner side of the upper end edge of the receiving frame 2 during the process, and the rib is inclined. As a result, the lid 1 is gradually lifted as it turns and rests on the ground surface and is fully open near the end of the turn. When the lid 1 is lifted to rest on the ground surface, the distance between the first and second fulcrums 3 and 4 is increased. However, since the elongated hole 27 of the hinge hardware 5 allows this, the lid is reliably opened.
[0018]
In addition, the configuration in which the head of the hinge 5 has a rugby ball shape can reduce the height compared to the case of a sphere, so that the height of the cavity 19 constituting the first fulcrum 3 can be reduced. The thickness of the edge of the substrate may not be increased more than necessary to form the cavity 19.
[0019]
As described above, the open / close structure of the lid for underground structures does not adversely affect the product value because the length of the hinge hardware does not have to be formed so long, and the hinge hardware is slanted sideways. Since the force required for the operation to make the upright state from the bottom may be small, the operability is good.
[0020]
【The invention's effect】
According to the first aspect of the present invention , when the lid is slightly lifted at the initial stage of the lid opening operation (the stage before the lid is horizontally swung), the entire lid does not seem to come out completely from the upper end surface of the receiving frame. Since the distance between the first and second fulcrum can be shortened, the force when raising the hinge hardware to the upright state is small, the lid can be opened with a small force, and thus the operability is improved. The projecting amount of the support arm at the second fulcrum can be reduced and the opening area can be increased accordingly.
According to the second aspect of the present invention, the rising of the hinge hardware is a smooth rotation, and since it is a long hole, the lid can be reliably lifted and displaced, and the operability is improved.
The invention according to claim 3 has an effect of preventing the edge of the lid from becoming unnecessarily thick.
[Brief description of the drawings]
FIG. 1 shows a closed state of an embodiment of the present invention, in which (a) is a plan view, (b) is a longitudinal front view, and (c) is a partially enlarged view of (b).
FIGS. 2A and 2B show a state in the middle of opening when the hinge hardware of the embodiment is raised, FIG. 2A being a plan view, FIG. 2B being a longitudinal front view, and FIG. 2C being a partially enlarged view of FIG. It is.
FIGS. 3A and 3B show a state in the middle of opening with the lid of the embodiment in the middle of horizontal turning, FIG. 3A being a plan view, FIG. 3B being a longitudinal front view, and FIG. 3C being a partially enlarged view of FIG. FIG.
4A and 4B show the hinge hardware of the embodiment, where FIG. 4A is a front view and FIG. 4B is a right side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lid 2 Receiving frame 3 1st fulcrum 4 2nd fulcrum 5 Hinge 10 Outer peripheral edge part 11, 12 Reinforcement rib 13 Edge 14 Opening 15 Receiving part 16 Lower extension part 17 Flange part 18 Enclosure wall 19 Cavity 20 Cut 21 Insert port 22 Horizontal shaft 23 Support arm 24 Head 25 Neck 26 Shaft 27 Long hole 28 Portions 29, 30 Stopper

Claims

A receiving frame that forms an opening and a lid that closes the opening, and a first fulcrum is provided near the inside of the edge of the lid, and is located on the inner side of the opening and below the first fulcrum position of the lid in the closed state. A second fulcrum is provided on the receiving frame side at the position, and the first fulcrum and the second fulcrum are connected by a hinge metal, and the hinge metal is between the fulcrum with the first fulcrum and the second fulcrum closed. than the distance against that proximity, coupling of the first fulcrum and the hinge fittings are hinge hardware to put a first supporting point on the upper side to allow pivoting of the horizontal plane of the lid in a state of being substantially vertical, said first connecting two fulcrum and hinged fittings are first fulcrum is allowable displacement in the direction of hinge hardware away from the second fulcrum point distance between the first pivot and the second pivot point of the lid closed, the first The fulcrum is located almost above the second fulcrum, the lid is slightly higher than the closed position, and the entire lid is completely from the upper end position of the receiving frame Closing structure of the underground construction for the lid, wherein the support span as the a configuration when in the position lifted so as not come out on the.

2. The lid opening / closing structure for an underground structure according to claim 1, wherein the second fulcrum is formed by a horizontal axis, and the hinge hardware has a long hole along the longitudinal direction, and the horizontal axis is inserted. A structure for opening and closing a lid for an underground structure.

The lid opening and closing structure for an underground structure according to claim 1 or claim 2, wherein the first fulcrum and the hinge part are connected to each other such that the end part of the hinge piece has a rugby ball-shaped head sideways. A lid for an underground structure, which is formed in a shape in which a shaft-like neck portion is continuous so as to form a letter shape, and the first fulcrum is configured to hold the head portion so as to be rotatable with respect to the head portion. Opening and closing structure.