JP4726103B2

JP4726103B2 - Ceiling access door

Info

Publication number: JP4726103B2
Application number: JP2001159975A
Authority: JP
Inventors: 辰夫庄司; 有弘永谷
Original assignee: Naka Corp
Current assignee: Naka Corp
Priority date: 2001-05-29
Filing date: 2001-05-29
Publication date: 2011-07-20
Anticipated expiration: 2021-05-29
Also published as: JP2002349055A

Description

【０００１】
【発明の属する技術分野】
本発明は、天井裏の配線、配管等を点検修理するために天井面に設置される天井点検口、特に外枠内に内枠が回動自在に嵌合され、且つ外枠に対し内枠を嵌脱可能とすることを特徴とする天井点検口に関する。
【０００２】
【従来の技術】
外枠内に内枠が回動自在に嵌合され、且つ外枠に対し内枠を嵌脱可能とする天井点検口は、例えば特公平２−５５５８５号公報に見られるように従来から種々の提案がなされている。これらの天井点検口では、内枠が外枠から取外せるために大がかりな点検や修理の場合に便利である一方、外枠から嵌脱可能な内枠が外れて意に反して落下する危険性が生じる。そして外枠からの内枠落下防止手段を付加する提案もなされているが、落下防止が不完全な手段であったり、落下をより完全に防止しようとして複雑な手段を用いたため内枠の嵌脱に著しく手間が掛る手段であったりしている。
【０００３】
【発明が解決しようとする課題】
本発明が解決しようとする課題は、外枠内に内枠が回動自在に嵌合され、且つ外枠に対し内枠を嵌脱可能とし、外枠に嵌合中の内枠の落下を防止し、外枠に対し内枠を嵌脱する操作が容易な手段を備えた天井点検口を提供することにある。
【０００４】
【課題を解決するための手段】
前記課題を解決するために、本発明にかかる天井点検口は、外枠条片を方形状に枠組した外枠内に内枠条片を方形状に枠組した内枠が回動自在に嵌合され且つ該外枠に対して該内枠が嵌脱可能とされる天井点検口において、該内枠の対向する一対の該内枠条片の端部近傍下方にはそれぞれ外向きの回転軸が突設され、該外枠の対向する一対の該外枠条片の内側には長さ方向に該回転軸が係合する凹溝がそれぞれ形成される。そして該外枠内に該内枠を嵌合したときには、該外枠の該凹溝に該内枠の該回転軸が滑動可能に係合する。また対向する一対の該外枠条片下縁には長さ方向に内向きの下部突縁が形成されている。
【０００５】
対向する一対の該外枠条片の内側における一端側上方には、それぞれ軸係止板がその一端部上方を枢着されて設けられている。該軸係止板は、該外枠条片の該下部突縁上に平接載置される底縁と、他端部上方から該底縁に向けて傾斜する斜縁と、該底縁から上方に向けて該回転軸が嵌入される凹入縁とを有し、該外枠の該凹溝に係合している該内枠の該回転軸が、該凹溝を一端側に滑動してやがて該軸係止板の該斜縁に当接することにより該軸係止板を持上げ、さらに滑動して該回転軸が該凹入縁に嵌入した場合に、該回転軸が他端側に移動して該凹入縁から脱出することを制限するために、嵌入状態の該回転軸が接する該凹入縁の他端部側の下端部は該回転軸の他端部側の端部よりも一端側に突出するように形成され、該底縁に対し他端部側に向けて鋭角状に切欠かれている。
【０００６】
【発明の実施の形態】
本発明にかかる天井点検口は、外枠条片を方形状に枠組した外枠内に内枠条片を方形状に枠組した内枠が回動自在に嵌合され且つ該外枠に対して該内枠が嵌脱可能とされる天井点検口において、該内枠の対向する一対の該内枠条片の端部近傍下方にはそれぞれ外向きの回転軸が突設され、該外枠の対向する一対の該外枠条片の内側には長さ方向に該回転軸が係合する凹溝がそれぞれ形成されると共に対向する一対の該外枠条片下縁には長さ方向に内向きの下部突縁が形成され、対向する一対の該外枠条片の内側における一端側上方にその一端部上方を枢着されたそれぞれの軸係止板は、該外枠条片の該下部突縁上に平接載置される底縁と、他端部上方から該底縁に向けて傾斜する斜縁と、該底縁から上方に向けて該回転軸が嵌入される凹入縁とを有し、該外枠の該凹溝に係合している該内枠の該回転軸が、該凹溝を一端側に滑動して該軸係止板の該斜縁に当接することにより該軸係止板を持上げて該凹入縁に嵌入した場合に、該回転軸が他端側に移動して該凹入縁から脱出することを制限するために、嵌入状態の該回転軸が接する該凹入縁の他端部側の下端部は該回転軸の他端部側の端部よりも一端側に突出するように形成され、該底縁に対し他端部側に向けて鋭角状に切欠かれていることを主な特徴とする。
【０００７】
また、回転軸が、軸係止板の枢着軸を中心として回動する軸係止板の凹入縁に円滑に嵌入できるようにするために、前記軸係止板の前記凹入縁は、前記回転軸が該軸係止板の枢着軸を中心として回動する該軸係止板の該凹入縁に円滑に嵌入できるようにするために、該軸係止板における前記底縁の一端部側から他端部側に向けて上昇する傾斜状に切欠かれ、該回転軸がこの傾斜に沿うように該軸係止板が回動することを特徴とする。
【０００８】
さらに、内枠が外枠に対して垂直な位置を越えた角度に開扉される場合に備えて、前記回転軸が前記軸係止板の前記凹入縁内で他端部側に若干の移動を許容するために、該凹入縁の他端部側は水平方向に拡張して切欠かれていることを特徴とする。
【０００９】
また、軸係止板の凹入縁に嵌入した回転軸が軸方向に脱嵌しないようにするために、前記回転軸の端部は拡径されていることを特徴とする。
【００１０】
さらに、密封型の天井点検口を形成するために、すべての前記外枠条片の上方には長さ方向に内向きの上部突縁が形成され、該上部突縁には封止条片が嵌着され、前記外枠に対して閉塞した前記内枠のすべての前記内枠条片の頂縁が該封止条片に圧着して封止状態を形成することを特徴とする。
【００１１】
上記したように構成され天井の所定の箇所に設置された天井点検口で、外枠に内枠を装着するには、内枠を外枠に対して垂直に立て且つ一時的に対角方向に位置させて、内枠の両回転軸を一対の対向する外枠条片の両凹溝に係合するように水平回転させる。両凹溝に係合した内枠の両回転軸を凹溝に沿って外枠の他端側から一端側の方向に滑動させる。外枠条片の一端側上方に枢着されていると共にその底縁が外枠条片の下部突縁上に載置されている軸係止板の斜縁にやがて回転軸が当接し、さらに滑動を進めると回転軸が軸係止板を持上げて底縁を通過し、その後軸係止板の凹入縁に嵌入して軸係止板は重力によって元の位置に戻り、嵌入された回転軸は、軸方向には凹溝の係合によって、また軸方向と直交する水平方向には凹入縁の係止によって移動を制限される。内枠の通常の開閉はこの状態で回転軸を中心とした内枠の回動操作によって行われる。前記のように回転軸の移動は制限されているから内枠が外れて落下する虞がない。外枠に装着されている内枠を取外すには、内枠開放状態で軸係止板を上方に持上げて凹入縁から回転軸を脱嵌し、内枠を側方に滑動させた上で、垂直軸回転し、両回転軸を両凹溝から脱出して行う。このように本発明によれば、外枠内に内枠が回動自在に嵌合され、且つ外枠に対し内枠を嵌脱可能とし、外枠に嵌合中の内枠の落下を防止し、且つ外枠に対し内枠を嵌脱する操作が容易な手段を備えた天井点検口を提供することができる。
【００１２】
【実施例】
本発明の実施例について添付図面を参照して説明する。
図１は天井点検口全体の分解斜視図であり、また図２および図３は天井点検口全体の縦断面図である。天井点検口において、外枠条片２を方形状に枠組した外枠１は天井面と同一面となるように天井構造体に対して吊持手段（図示されていない。）によって吊持されており、天井裏への口部を形成する。外枠１内には内枠条片４を方形状に枠組した内枠３が後述するように外枠１が形成する口部を閉塞出来るように外枠１に対して回動自在に且つ必要に応じて嵌脱自在に設置されている。内枠３内には天井下地板５と天井仕上板６とが敷設されていて、内枠３に口部の蓋体としての機能を保有させている。なお図１乃至図３において、符号１８は閉塞状態の内枠３を保持するために外枠１に設置された錠止具である。
【００１３】
本発明にかかる天井点検口は、外枠１に対する内枠３の開閉機構に特徴を有するので、次にその点について説明する。内枠３は、４枚の内枠条片４を内枠隅金具７によって方形状に接合して形成され、内部には前述のように天井下地板５と天井仕上板６とが敷設されている。内枠３の対向する一対の内枠条片４，４の端部近傍下方にはそれぞれ外向きの回転軸８が突設されている。図５および図６に示されるように、回転軸８の先端には拡径部９が設けられ、後述するように内枠３の移動制限に役立つようにされている。また回転軸８は直接的には内枠条片４と一体的な内枠隅金具７に止着されているが、実質的には内枠条片４から突設されていることになる。外枠１は、４枚の外枠条片２を外枠隅金具１０によって方形状に接合して形成され、少なくとも対向する一対の外枠条片２，２には、それぞれその内側に回転軸８が係合する凹溝１１が形成され、また外枠条片２下縁には長さ方向に内向きの下部突縁１２が形成されている。なお図５および図６において符号２０は建物自体の天井板である。
【００１４】
図５に示されるように、対向する一対の外枠条片２，２の内側における一側端上方には、それぞれ軸係止板１３の一端部上方が枢着軸１４で枢着されている。軸係止板１３は外枠条片２の下部突縁１２上に平接載置される底縁１５と、他端部上方から底縁１５に向けて傾斜する斜縁１６と、底縁１５から上方に向けて回転軸８が嵌入される凹入縁１７とを有している。図４に示されるように、外枠条片２の凹溝１１に係合している内枠３の回転軸８が凹溝１１を一端側に滑動すると、やがて外枠条片２の一端側上方に枢着されており、その底縁１５が外枠条片２の下部突縁１２上に載置されている軸係止板１３の斜縁１６に回転軸８が当接し、さらに滑動を進めると、図４の円弧状矢印のように、回転軸８が軸係止板１３を持上げて底縁１５を通過し、やがて軸係止板１３の凹入縁１７に嵌入して軸係止板１３は重力で元の位置に戻る。嵌入状態の回転軸８が接する凹入縁１７の他端部側は底縁１５に対し他端部側に向けて鋭角状に切欠かれており、凹入縁１７に嵌入した回転軸８が他端側に移動して凹入縁１７から脱出することを制限される。このように凹入縁１７に嵌入された回転軸８は、軸方向には凹溝１１の係合によって、また軸方向と直交する水平方向には凹入縁１７の係止によって移動を制限される。
【００１５】
内枠３の通常の回転開閉は、外枠１内に開閉自在に内枠３が軸支されたこの状態で回転軸８を中心とした内枠３の開閉操作によって行われる。軸係止板１３について、さらに詳細な構成をみてみると、軸係止板１３の凹入縁１７は、底縁１５の一端部側から他端部側に向けて上昇する傾斜状に切欠かれており、これは回転軸８が、軸係止板１３の枢着軸１４を中心として回動する軸係止板１３の凹入縁１７に円滑に嵌入できるようにするために傾斜状にされたものであり、回転軸８はこの傾斜に沿って嵌入されることになる。また図７に示されるように、内枠３が外枠１に対して垂直を超えた角度に開扉させる場合に、内枠３の一部が外枠条片２に衝接して開扉が制限されるときにも、回転軸８が軸係止板１３の凹入縁１７内で若干の移動を許容して大角度の開扉を可能とするために、凹入縁１７の他端部側は水平方向に拡張して切欠かれて拡張切欠１９が形成されている。また回転軸８の軸方向への移動制限は凹溝１１の係合によって行われるが、前記したように回転軸８の先端には拡径部９が設けられていて、図５および図６に示されるように、軸係止板１３の凹入縁１７に嵌入された回転軸８の拡径部９が凹入縁１７周りの軸係止板１３に係合することによって、さらに回転軸８が軸方向に脱嵌することのないようにされている。
【００１６】
天井の所定箇所に設置された天井点検口で、天井構造体に固定された外枠１に内枠３を装着するには、内枠３を外枠１に対して垂直に立て、且つ一時的に対角方向に位置させて、内枠３の両回転軸８，８を一対の対向する外枠条片２、２の両凹溝１１、１１に係合するように水平回転させる。両凹溝１１，１１に係合した内枠３の両回転軸８，８をそれぞれ凹溝１１に沿って外枠１の他端側から一端側の方向に滑動させる。滑動が進むと前述のように軸係止板１３の斜縁１６に回転軸８が当接し、回転軸８が軸係止板１３を持上げて底縁１５を通過し、やがて軸係止板１３の凹入縁１７に嵌入して軸係止板１３は重力で元位置に戻り、天井点検口の通常の開閉使用状態に到達し、内枠３の通常の開閉はこの状態で回転軸８を中心とした内枠の回動操作によって行われる。前記のように回転軸８の移動は制限されているから内枠３が落下する虞がない。外枠１に装着されている内枠３を取外すには、内枠開放状態でそれぞれの軸係止板１３を上方に持上げて凹入縁１７から回転軸８を脱嵌し、内枠３を側方に滑動させた上で垂直軸回転し、両回転軸８，８を両凹溝１１，１１から脱出して行う。
【００１７】
本発明の他の効果として、製造工場から外枠１に内枠３を装着した状態で天井点検口を出荷する場合に、外枠１に内枠３を装着するには、外枠１を上下反転させて作業台上に載置すれば、軸係止板１３の底縁１５は重力で外枠条片２の下部突縁１２から離れるから、その上部から上下反転させた内枠３を僅かに捻って両回転軸８，８を外枠条片２，２の凹溝１１，１１に嵌合すれば簡単に外枠１に内枠３を装着することが出来る。図８および図９には前記した目的、構成を具備した天井点検口について、さらに屋内と天井裏とを密封状に閉塞する密封型天井点検口の例が示されている。密封型天井点検口では、すべての外枠条片２の上方に長さ方向に内向きの上部突縁２１が形成され、上部突縁２１には弾力性を有する封止条片２２が嵌着される。内枠３では、天井下地板５および天井仕上板６が内枠条片４と密封状態で接合されており、外枠１に対して閉塞した内枠３のすべての内枠条片４の頂縁２３が封止条片２２に圧着して封止状態を形成する。密封型天井点検口のその他の構成は前記した実施例と同様である。
【００１８】
【発明の効果】
本発明は、次のような効果を奏する。
Ａ．所定の箇所に設置された天井点検口で、外枠に対して分離している内枠を装着するには、内枠を外枠に対して垂直に立て且つ一時的に対角方向に位置させて、内枠の両回転軸を一対の対向する外枠条片の両凹溝に係合するように水平回転させ、次いで両凹溝に係合した内枠の両回転軸を凹溝に沿って外枠の他端側から一端側の方向に滑動させ、やがて軸係止板の斜縁に回転軸が当接して回転軸が軸係止板を持上げて底縁を通過し、その後軸係止板の凹入縁に嵌入して軸係止板は重力で元の位置に戻ることによって、外枠に対して内枠を回動自在に軸着した通常の天井点検口の設置状態となり、凹入縁に嵌入された回転軸は軸方向には凹溝の係合によって、また軸方向と直交する水平方向には凹入縁の係止によって移動を制限されているからこの設置状態で回転軸の移動は制限されているから内枠が落下する虞がない。また外枠に対して分離している内枠を装着する操作が容易である。
Ｂ．嵌入状態の回転軸が接する凹入縁の他端部側の下端部は該回転軸の他端部側の端部よりも一端側に突出するように形成され、該底縁に対し他端部側に向けて鋭角状に切欠かれており、凹入縁に嵌入した回転軸が他端側に移動して凹入縁から脱出することを制限される。
Ｃ．外枠に装着されている内枠を取外すには、内枠開放状態で軸係止板を上方に持上げて凹入縁から回転軸を脱嵌し、内枠を側方に滑動させた上で、垂直軸回転し、両回転軸を両凹溝から脱出して行うことができるから、外枠から内枠を取外す操作が容易である。
【００１９】
Ｄ．製造工場から外枠に内枠を装着した状態で天井点検口を出荷する場合に、外枠に内枠を装着するには、外枠を上下反転させて作業台上に載置すれば、軸係止板の底縁は重力で外枠条片の下部突縁から離れるから、その上部から上下反転させた内枠を僅かに捻って両回転軸を外枠条片の凹溝に嵌合すれば簡単に外枠に内枠を装着することが出来る。
Ｅ．軸係止板の凹入縁が軸係止板における底縁の一端部側から他端部側に向けて上昇する傾斜状に切欠かれる実施形態では、軸係止板の枢着軸を中心として回動する軸係止板の凹入縁に回転軸を円滑に嵌入できる。
Ｆ．凹入縁の他端部側が水平方向に拡張して切欠かれている実施形態では、内枠が外枠に対して垂直な位置を越えた角度に開扉される場合に対応できる。
Ｇ．回転軸の端部が拡径されている実施形態では、軸係止板の凹入縁に嵌入した回転軸について軸方向の脱嵌の虞をさらに防止することができる。
Ｈ．すべての外枠条片の上方に長さ方向に内向きの上部突縁が形成され、上部突縁には封止条片が嵌着され、外枠に対して閉塞した内枠のすべての内枠条片の頂縁が該封止条片に圧着して封止状態を形成させる実施形態では、密封型の天井点検口を形成することができる。
【図面の簡単な説明】
【図１】天井点検口の全体を示す分解斜視図である。
【図２】同じく天井点検口の縦断面図である。
【図３】図２と別方向から見た天井点検口の縦断面図である。
【図４】回転軸が軸係止板に向って滑動する状況を示す部分斜視図である。
【図５】回転軸が軸係止板に嵌入した状態を示す部分垂直断面図である。
【図６】図５のＡ−Ａ’断面を示す部分垂直断面図である。
【図７】内枠開扉状態を示す部分垂直断面図である。
【図８】密封型天井点検口の垂直断面図である。
【図９】別方向から見た密封型天井点検口の部分垂直断面図である。
【符号の説明】
１外枠
２外枠条片
３内枠
４内枠条片
８回転軸
９拡径部
１１凹溝
１２下部突縁
１３軸係止板
１４枢着軸
１５底縁
１６斜縁
１７凹入縁
１９拡張切欠
２１上部突縁
２２封止条片
２３頂縁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ceiling inspection port installed on a ceiling surface for inspecting and repairing wiring, piping and the like on the back of the ceiling, in particular, the inner frame is rotatably fitted in the outer frame, and the inner frame is connected to the outer frame. The present invention relates to a ceiling inspection opening characterized by being capable of fitting and removing.
[0002]
[Prior art]
A ceiling inspection port in which the inner frame is rotatably fitted in the outer frame and the inner frame can be inserted into and removed from the outer frame has been variously disclosed in, for example, Japanese Patent Publication No. 2-55585. Proposals have been made. These ceiling inspection openings are convenient for large-scale inspections and repairs because the inner frame can be removed from the outer frame, while there is a risk that the inner frame that can be removed from the outer frame will come off and fall unexpectedly. Occurs. Proposals have also been made to add means for preventing the inner frame from falling from the outer frame. However, since the means for preventing the drop is incomplete, or because complicated means were used to prevent the fall more completely, the inner frame could be removed. It is a means that takes a lot of time and effort.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that the inner frame is rotatably fitted in the outer frame, the inner frame can be fitted to and removed from the outer frame, and the inner frame that is being fitted to the outer frame is dropped. An object of the present invention is to provide a ceiling inspection port provided with a means for preventing and easily fitting and removing the inner frame with respect to the outer frame.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the ceiling inspection port according to the present invention is configured such that an inner frame having a rectangular inner frame strip is rotatably fitted in an outer frame having a rectangular outer frame strip. In the ceiling inspection port in which the inner frame can be inserted into and removed from the outer frame, an outward rotating shaft is respectively provided below the ends of the pair of inner frame strips facing the inner frame. A concave groove is formed on the inner side of the pair of outer frame strips projecting from each other and engaging with the rotating shaft in the length direction. When the inner frame is fitted into the outer frame, the rotation shaft of the inner frame is slidably engaged with the concave groove of the outer frame. Further, a lower protruding edge inward in the length direction is formed on the lower edge of the pair of opposed outer frame strips.
[0005]
A shaft locking plate is pivotally mounted on the upper end of each of the outer frame strips on the inner side of the pair of opposing outer frame strips. The shaft locking plate includes a bottom edge that is flatly mounted on the lower projecting edge of the outer frame strip, a slanted edge that is inclined from above the other end toward the bottom edge, and a bottom edge. The rotary shaft of the inner frame that has a concave insertion edge into which the rotary shaft is fitted upward and is engaged with the concave groove of the outer frame slides the concave groove toward one end. Eventually, the shaft locking plate is lifted by coming into contact with the inclined edge of the shaft locking plate, and when the rotation shaft is fitted into the recessed edge by sliding further, the rotation shaft is moved to the other end side. In order to limit the movement and escape from the recessed edge, the lower end portion on the other end side of the recessed edge where the rotating shaft in the fitted state comes into contact is more than the end portion on the other end side of the rotating shaft. Is also formed so as to protrude to one end side, and is cut out at an acute angle toward the other end side with respect to the bottom edge.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The ceiling inspection port according to the present invention has an inner frame in which an inner frame strip is squarely fitted in an outer frame in which the outer frame strip is framed in a square shape, and is rotatably fitted to the outer frame. In the ceiling inspection opening in which the inner frame is detachable, an outward rotating shaft projects from the lower part near the ends of the pair of inner frame strips facing the inner frame. A concave groove that engages with the rotation shaft is formed in the length direction on the inner side of the pair of opposed outer frame strips, and the lower edge of the pair of opposed outer frame strips is inward in the length direction. Each of the shaft locking plates formed on the lower end of the outer frame strip is formed at the lower end of the outer frame strip. A bottom edge that is placed flat on the protruding edge, a slanted edge that slopes toward the bottom edge from above the other end, and a concave edge that fits the rotating shaft upward from the bottom edge And the rotating shaft of the inner frame that is engaged with the concave groove of the outer frame slides the concave groove to one end side and comes into contact with the oblique edge of the shaft locking plate. When the shaft locking plate is lifted and inserted into the recessed edge, the rotational shaft in the inserted state is restricted so that the rotational shaft moves to the other end side and escapes from the recessed edge. The lower end portion on the other end side of the indented edge in contact is formed so as to protrude toward the one end side from the end portion on the other end side of the rotating shaft, and an acute angle toward the other end portion side with respect to the bottom edge The main feature is that it is cut into a shape.
[0007]
Further, in order to allow the rotation shaft to smoothly fit into the recessed edge of the shaft locking plate that rotates about the pivot shaft of the shaft locking plate, the recessed edge of the shaft locking plate is , to the rotating shaft to smoothly fit into the recess Nyuen of the shaft locking plate which rotates about the pivot axis of the shaft locking plate, wherein in said shaft locking plate bottom edge The shaft locking plate is rotated so that the rotation shaft follows this inclination .
[0008]
Further, in preparation for the case where the inner frame is opened at an angle exceeding the position perpendicular to the outer frame, the rotating shaft is slightly slightly on the other end side within the recessed edge of the shaft locking plate. In order to allow movement, the other end portion side of the recessed edge is horizontally extended and cut away.
[0009]
In addition, the end of the rotating shaft is enlarged in diameter so that the rotating shaft fitted into the recessed edge of the shaft locking plate does not detach in the axial direction.
[0010]
Further, in order to form a sealed ceiling inspection port, an upper protruding edge inward in the length direction is formed above all the outer frame strips, and a sealing strip is formed on the upper protruding edge. The top edges of all the inner frame strips of the inner frame that are fitted and closed with respect to the outer frame are crimped to the sealing strip to form a sealed state.
[0011]
In order to attach the inner frame to the outer frame at the ceiling inspection port configured as described above and installed at a predetermined position of the ceiling, the inner frame is vertically set with respect to the outer frame and temporarily diagonally positioned. Positioned and horizontally rotated so that both rotation shafts of the inner frame engage with both concave grooves of a pair of opposed outer frame strips. Both rotation shafts of the inner frame engaged with the both concave grooves are slid along the concave groove from the other end side of the outer frame to one end side. The rotating shaft eventually comes into contact with the oblique edge of the shaft locking plate that is pivotally attached to the upper end of the outer frame strip and whose bottom edge is placed on the lower projecting edge of the outer frame strip. When the slide is advanced, the rotating shaft lifts the shaft locking plate and passes through the bottom edge, then fits into the recessed edge of the shaft locking plate, the shaft locking plate returns to its original position by gravity, and the inserted rotation The shaft is limited in movement in the axial direction by engagement of the concave groove and in the horizontal direction perpendicular to the axial direction by locking of the concave edge. In this state, the inner frame is normally opened and closed by rotating the inner frame around the rotation axis. As described above, since the movement of the rotating shaft is restricted, there is no possibility that the inner frame will come off and fall. To remove the inner frame attached to the outer frame, lift the shaft locking plate upward with the inner frame open, detach the rotating shaft from the recessed edge, and slide the inner frame sideways. Rotate the vertical axis and escape both rotary shafts from both concave grooves. As described above, according to the present invention, the inner frame is rotatably fitted in the outer frame, and the inner frame can be fitted to and detached from the outer frame, thereby preventing the inner frame from falling while being fitted to the outer frame. In addition, it is possible to provide a ceiling inspection port provided with means for easily fitting and removing the inner frame with respect to the outer frame.
[0012]
【Example】
Embodiments of the present invention will be described with reference to the accompanying drawings.
1 is an exploded perspective view of the entire ceiling inspection port, and FIGS. 2 and 3 are longitudinal sectional views of the entire ceiling inspection port. At the ceiling inspection port, the outer frame 1 obtained by framing the outer frame strip 2 in a rectangular shape is suspended from the ceiling structure by a suspension means (not shown) so as to be flush with the ceiling surface. And form a mouth to the ceiling. In the outer frame 1, the inner frame 3 in which the inner frame strips 4 are formed in a square shape is rotatable and necessary with respect to the outer frame 1 so that the mouth formed by the outer frame 1 can be closed as will be described later. It is installed so that it can be freely inserted and removed. A ceiling base plate 5 and a ceiling finishing plate 6 are laid in the inner frame 3, and the inner frame 3 has a function as a lid for the mouth. 1 to 3, reference numeral 18 denotes a locking device installed on the outer frame 1 for holding the closed inner frame 3.
[0013]
Since the ceiling inspection port according to the present invention is characterized by the opening / closing mechanism of the inner frame 3 relative to the outer frame 1, this point will be described next. The inner frame 3 is formed by joining four inner frame strips 4 in a square shape with inner frame corner fittings 7, and a ceiling base plate 5 and a ceiling finishing plate 6 are laid inside as described above. Yes. Outward rotating shafts 8 project from the lower portions near the ends of the pair of inner frame strips 4, 4 facing the inner frame 3. As shown in FIG. 5 and FIG. 6, an enlarged diameter portion 9 is provided at the tip of the rotating shaft 8 so as to help limit the movement of the inner frame 3 as will be described later. The rotating shaft 8 is directly fixed to the inner frame corner metal fitting 7 integral with the inner frame strip 4, but substantially protrudes from the inner frame strip 4. The outer frame 1 is formed by joining four outer frame strips 2 in a square shape by an outer frame corner bracket 10, and at least a pair of outer frame strips 2, 2 facing each other have a rotating shaft inside thereof. 8 is formed, and a lower edge 12 inward in the longitudinal direction is formed on the lower edge of the outer frame strip 2. 5 and 6, reference numeral 20 denotes a ceiling board of the building itself.
[0014]
As shown in FIG. 5, the upper end of one end portion of the shaft locking plate 13 is pivotally mounted on the pivot shaft 14 on the inner side of the pair of opposed outer frame strips 2, 2. . The shaft locking plate 13 includes a bottom edge 15 that is placed flat on the lower projecting edge 12 of the outer frame strip 2, a slanted edge 16 that is inclined from the upper end of the other end toward the bottom edge 15, and a bottom edge 15. And a concave edge 17 into which the rotary shaft 8 is fitted upward. As FIG. 4 shows, if the rotating shaft 8 of the inner frame 3 engaged with the concave groove 11 of the outer frame strip 2 slides the concave groove 11 to one end side, one end side of the outer frame strip 2 will eventually be obtained. The rotating shaft 8 abuts on the oblique edge 16 of the shaft locking plate 13 whose bottom edge 15 is mounted on the lower protruding edge 12 of the outer frame strip 2 and is further slid. When advanced, the rotary shaft 8 lifts the shaft locking plate 13 and passes through the bottom edge 15 as shown by an arc-shaped arrow in FIG. 4, and eventually fits into the recessed edge 17 of the shaft locking plate 13 to lock the shaft. The plate 13 returns to its original position by gravity. The other end portion side of the recessed edge 17 with which the inserted rotating shaft 8 is in contact is notched at an acute angle toward the other end portion with respect to the bottom edge 15, and the rotating shaft 8 inserted into the recessed edge 17 is the other. It is limited to move to the end side and escape from the recessed edge 17. Thus, the rotation shaft 8 fitted into the recessed edge 17 is restricted in movement by the engagement of the recessed groove 11 in the axial direction and by the engagement of the recessed edge 17 in the horizontal direction perpendicular to the axial direction. The
[0015]
The normal rotation opening and closing of the inner frame 3 is performed by opening and closing the inner frame 3 around the rotation shaft 8 in this state in which the inner frame 3 is pivotally supported in the outer frame 1 so as to be freely opened and closed. Looking at a more detailed configuration of the shaft locking plate 13, the recessed edge 17 of the shaft locking plate 13 is notched in an inclined shape that rises from one end side to the other end side of the bottom edge 15. This is inclined so that the rotating shaft 8 can be smoothly fitted into the recessed edge 17 of the shaft locking plate 13 that rotates about the pivot shaft 14 of the shaft locking plate 13. Therefore, the rotary shaft 8 is inserted along this inclination. Further, as shown in FIG. 7, when the inner frame 3 is opened at an angle exceeding the perpendicular to the outer frame 1, a part of the inner frame 3 comes into contact with the outer frame strip 2 to open the door. Even when restricted, the other end of the recessed edge 17 allows the rotary shaft 8 to move slightly within the recessed edge 17 of the shaft locking plate 13 and to open the door at a large angle. The side is expanded in the horizontal direction and cut away to form an extended cutout 19. Further, the movement of the rotating shaft 8 in the axial direction is restricted by the engagement of the concave groove 11, but as described above, the diameter increasing portion 9 is provided at the tip of the rotating shaft 8, as shown in FIGS. As shown in the drawing, the enlarged diameter portion 9 of the rotary shaft 8 fitted in the recessed edge 17 of the shaft locking plate 13 engages with the shaft locking plate 13 around the recessed edge 17, thereby further rotating the rotational shaft 8. Is prevented from being detached in the axial direction.
[0016]
In order to attach the inner frame 3 to the outer frame 1 fixed to the ceiling structure with a ceiling inspection port installed at a predetermined position of the ceiling, the inner frame 3 is set up vertically with respect to the outer frame 1 and temporarily The rotating shafts 8 and 8 of the inner frame 3 are horizontally rotated so as to engage with the concave grooves 11 and 11 of the pair of opposing outer frame strips 2 and 2. The two rotating shafts 8 and 8 of the inner frame 3 engaged with the both concave grooves 11 and 11 are slid along the concave groove 11 from the other end side of the outer frame 1 to the one end side. As the sliding proceeds, the rotating shaft 8 comes into contact with the oblique edge 16 of the shaft locking plate 13 as described above, the rotating shaft 8 lifts the shaft locking plate 13 and passes through the bottom edge 15, and eventually the shaft locking plate 13. The shaft locking plate 13 is returned to its original position by gravity and reaches the normal opening / closing use state of the ceiling inspection port, and the normal opening / closing of the inner frame 3 is performed in this state to rotate the rotating shaft 8. This is done by turning the inner frame around the center. Since the movement of the rotating shaft 8 is restricted as described above, there is no possibility that the inner frame 3 will fall. In order to remove the inner frame 3 attached to the outer frame 1, the respective shaft locking plates 13 are lifted upward in a state where the inner frame is opened, the rotary shaft 8 is detached from the recessed edge 17, and the inner frame 3 is removed. After sliding to the side, the vertical axis is rotated, and both rotary shafts 8 and 8 are escaped from both concave grooves 11 and 11.
[0017]
As another effect of the present invention, when the ceiling inspection port is shipped with the inner frame 3 attached to the outer frame 1 from the manufacturing factory, the outer frame 1 is moved up and down to attach the inner frame 3 to the outer frame 1. If it is reversed and placed on the work table, the bottom edge 15 of the shaft locking plate 13 is separated from the lower protrusion 12 of the outer frame strip 2 by gravity, so the inner frame 3 that is vertically inverted from the upper part is slightly The inner frame 3 can be easily attached to the outer frame 1 by twisting the two rotating shafts 8 and 8 into the concave grooves 11 and 11 of the outer frame strips 2 and 2. FIG. 8 and FIG. 9 show an example of a sealed ceiling inspection port for sealing the interior and the back of the ceiling in a sealing manner with respect to the ceiling inspection port having the above-described object and configuration. In the sealed ceiling inspection port, a lengthwise inward upper protruding edge 21 is formed above all outer frame strips 2, and an elastic sealing strip 22 is fitted to the upper protruding edge 21. Is done. In the inner frame 3, the ceiling base plate 5 and the ceiling finishing plate 6 are joined to the inner frame strip 4 in a sealed state, and the tops of all the inner frame strips 4 of the inner frame 3 closed with respect to the outer frame 1. The edge 23 is crimped to the sealing strip 22 to form a sealed state. Other configurations of the sealed ceiling inspection port are the same as those in the above-described embodiment.
[0018]
【The invention's effect】
The present invention has the following effects.
A. To install the inner frame separated from the outer frame at the ceiling inspection port installed at a predetermined location, the inner frame is vertically set with respect to the outer frame and temporarily positioned diagonally. Then, the two rotation shafts of the inner frame are horizontally rotated so as to engage with the two concave grooves of the pair of opposed outer frame strips, and then the two rotation shafts of the inner frame engaged with the two concave grooves are along the concave grooves. The shaft is slid in the direction from the other end side to the one end side of the outer frame. Eventually, the rotating shaft comes into contact with the oblique edge of the shaft locking plate, and the rotating shaft lifts the shaft locking plate and passes through the bottom edge. By inserting into the recessed edge of the stop plate and returning the shaft locking plate to its original position by gravity, it becomes the installation state of a normal ceiling inspection port with the inner frame pivotally attached to the outer frame, This is because the movement of the rotating shaft fitted in the recessed edge is restricted by the engagement of the recessed groove in the axial direction and by the locking of the recessed edge in the horizontal direction perpendicular to the axial direction. Inner frame since the movement of the rotating shaft is limited there is no risk of falling in the installed state. Further, the operation of mounting the inner frame separated from the outer frame is easy.
B. The lower end on the other end portion side of the recessed edge that contacts the inserted rotation shaft is formed so as to protrude from the other end portion of the rotation shaft to one end side, and the other end portion with respect to the bottom edge It is notched at an acute angle toward the side, and it is restricted that the rotating shaft fitted into the recessed edge moves to the other end side and escapes from the recessed edge.
C. To remove the inner frame attached to the outer frame, lift the shaft locking plate upward with the inner frame open, detach the rotating shaft from the recessed edge, and slide the inner frame sideways. Since the rotation can be performed by rotating the vertical axis and removing both the rotation shafts from both concave grooves, the operation of removing the inner frame from the outer frame is easy.
[0019]
D. When the ceiling inspection port is shipped with the inner frame attached to the outer frame from the manufacturing plant, the inner frame can be attached to the outer frame by turning the outer frame upside down and placing it on the workbench. Since the bottom edge of the locking plate is separated from the lower edge of the outer frame strip by gravity, slightly twist the inner frame that is turned upside down from the upper portion to fit both rotation shafts into the groove in the outer frame strip. The inner frame can be easily attached to the outer frame.
E. In an embodiment in which the recessed edge of the shaft locking plate is cut out in an inclined manner rising from one end side to the other end side of the bottom edge of the shaft locking plate, the pivoting shaft of the shaft locking plate is the center. The rotating shaft can be smoothly inserted into the recessed edge of the rotating shaft locking plate.
F. In the embodiment in which the other end portion side of the recessed edge extends and is cut out in the horizontal direction, it is possible to cope with the case where the inner frame is opened at an angle exceeding the position perpendicular to the outer frame.
G. In the embodiment in which the diameter of the end of the rotating shaft is increased, it is possible to further prevent the axial disengagement of the rotating shaft inserted into the recessed edge of the shaft locking plate.
H. An upper projecting edge that is inward in the longitudinal direction is formed above all outer frame strips, and a sealing strip is fitted on the upper projecting edge, so that all inner frames of the inner frame that are closed to the outer frame are closed. In the embodiment in which the top edge of the frame strip is crimped to the sealing strip to form a sealed state, a sealed ceiling inspection port can be formed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an entire ceiling inspection port.
FIG. 2 is a longitudinal sectional view of the ceiling inspection port.
FIG. 3 is a longitudinal sectional view of a ceiling inspection port viewed from a direction different from FIG. 2;
FIG. 4 is a partial perspective view showing a situation in which a rotating shaft slides toward a shaft locking plate.
FIG. 5 is a partial vertical sectional view showing a state in which a rotation shaft is fitted in a shaft locking plate.
6 is a partial vertical cross-sectional view showing a cross section AA ′ in FIG. 5;
FIG. 7 is a partial vertical sectional view showing an inner frame opened state.
FIG. 8 is a vertical sectional view of a sealed ceiling inspection port.
FIG. 9 is a partial vertical sectional view of the sealed ceiling inspection port viewed from another direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer frame 2 Outer frame strip 3 Inner frame 4 Inner frame strip 8 Rotating shaft 9 Expanded portion 11 Groove 12 Lower protrusion 13 Shaft locking plate 14 Pivoting shaft 15 Bottom edge 16 Slope edge 17 Recessed edge 19 Expansion notch 21 Upper protruding edge 22 Sealing strip 23 Top edge

Claims

An inner frame having an inner frame strip framed in a rectangular shape is rotatably fitted in an outer frame in which the outer frame strip framed in a square shape, and the inner frame is detachable from the outer frame. In the ceiling inspection port, a pair of outer frame strips facing each other are provided with projecting rotary shafts projecting downward in the vicinity of the ends of the pair of inner frame strips facing the inner frame. On the inner side, a groove is formed in the length direction to engage the rotation shaft, and a pair of the outer frame strips facing each other has a lower protruding edge inward in the length direction. Each of the shaft locking plates pivoted on the upper end of one end on the inner side of the pair of opposing outer frame strips is mounted flat on the lower projecting edge of the outer frame strip. A bottom edge, an oblique edge inclined toward the bottom edge from above the other end, and a recessed edge into which the rotary shaft is fitted upward from the bottom edge, Engage in the groove The rotating shaft of the inner frame slides the concave groove to one end side and abuts against the oblique edge of the shaft locking plate to lift the shaft locking plate and fit into the recessed edge In this case, in order to restrict the rotation shaft from moving to the other end side and escaping from the recess insertion edge, the lower end portion on the other end portion side of the recess insertion edge that is in contact with the insertion shaft is The ceiling inspection port, which is formed so as to protrude toward one end side from the end portion on the other end side of the rotating shaft, and is cut out at an acute angle toward the other end side with respect to the bottom edge. .

The recessed edge of the shaft locking plate is configured so that the rotating shaft can be smoothly fitted into the recessed edge of the shaft locking plate that rotates about the pivot shaft of the shaft locking plate. on the notched on inclined rising toward the other end from one end side of the bottom edge of the shaft locking plate, the rotary shaft is the shaft locking plate rotate along the inclined The ceiling inspection port according to claim 1 characterized by things.

In order to allow the rotation shaft to move slightly toward the other end within the recessed edge of the locking plate, the other end of the recessed edge is notched by extending in the horizontal direction. The ceiling inspection port according to claim 1 or 2, characterized by the above-mentioned.

The ceiling inspection port according to any one of claims 1 to 3, wherein an end portion of the rotating shaft is expanded in diameter.

Above all the outer frame strips, there are formed upper protruding edges inward in the lengthwise direction, and sealing strips are fitted on the upper protruding edges and closed on the outer frame. The ceiling inspection port according to any one of claims 1 to 4, wherein a top edge of all the inner frame strips of the frame is pressed against the sealing strip to form a sealed state.