JP3698972B2 - Ceiling access door - Google Patents

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JP3698972B2
JP3698972B2 JP2000280488A JP2000280488A JP3698972B2 JP 3698972 B2 JP3698972 B2 JP 3698972B2 JP 2000280488 A JP2000280488 A JP 2000280488A JP 2000280488 A JP2000280488 A JP 2000280488A JP 3698972 B2 JP3698972 B2 JP 3698972B2
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JP2002089029A (en
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則夫 大木
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理研アルミ建材株式会社
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Description

【０００１】
【発明の属する技術分野】
この発明は、建築物、船舶、地下通路等の構築物の天井裏に配設された各種の配線・配管等を保守・点検するために天井板に開口された開口部に装着される天井点検口に関する。
【０００２】
【従来の技術】
従来、天井板に開口された開口部に装着される外枠体と、その外枠体の開口部に対し、一方向に長い一対の開閉用アームによって開閉可能に組み付けられる内枠体と、外枠体と内枠体との間に跨って係脱可能に配設され同内枠体を閉じ状態に閉止する閉止手段と、を備えた構造の天井点検口が知られている。
また、この種の天井点検口には、例えば、特開２０００−６４５８６号公報等に開示されている。
【０００３】
【発明が解決しようとする課題】
ところで、外枠体の外枠部と内枠体の内枠部との間に一方向に長い一対の開閉用アームを配置するためのスペースを確保するために、外枠部と内枠部との間の隙間を所定値以上に大きくする必要がある。そして、外枠部と内枠部との間に設けられた隙間に相当する分だけ外枠体に対し内枠体が水平方向にガタツキやすくなるという問題点があった。
【０００４】
この発明の目的は、前記従来の問題点に鑑み、外枠体に対する内枠体の水平方向のガタツキを防止しながら、外枠体と内枠体との間に開閉用アームを配設するためのスペースを容易に確保することができる天井点検口を提供することである。
【０００５】
【課題を解決するための手段】
前記目的を達成するために、請求項１の発明に係る天井点検口は、天井板の開口部に装着される外枠体と、前記外枠体の開口部に対し一方向に長い一対の開閉用アームによって開閉可能に組み付けられる内枠体と、前記外枠体と前記内枠体との間に跨って係脱可能に配設され同内枠体を閉じ状態に閉止する閉止手段と、を備えた天井点検口であって、前記外枠体は、その外枠部の断面において、前記天井板の開口部の内周面に沿う外下壁部と、その外下壁部から内側に向けて張り出された上段差部と、その段差部から上方に向けて設けられた外上壁部とを有する一方、前記内枠体は、その内枠部の断面において、前記外下壁部の内周面に沿う内下壁部と、その内下壁部から前記上段差部の下面に沿って張り出された中段差部と、前記外上壁部の内周面に沿いかつ前記中段差部から上方に向けて設けられた内上壁部とを有し、前記外下壁部から張り出された上段差部の張り出し寸法に対し、前記内下壁部から張り出された中段差部の張り出し寸法が大きく設定され、これによって前記外上壁部と前記内上壁部との間に構成された隙間内おいて前記開閉用アームが配設されている。
したがって、外枠体に対し内枠体を開放する場合、閉止手段による係合を外した状態で、外枠体に対し内枠体が開閉用アームを介して開放される。
また、外枠体と内枠体において、外枠体の外下壁部から内側に向けて張り出された上段差部の張り出し寸法に対し、内枠体の内下壁部から内側に向けて張り出された中段差部の張り出し寸法が適宜に大きく設定されている。これによって、外枠体の外下壁部と内枠体の内下壁部との間の隙間は可及的に小さく設定しながら、外枠体の外上壁部と内枠体の内上壁部との間には、一対の開閉用アームを配設するための隙間を容易に確保することができる。
さらに、外下壁部と内下壁部との間の隙間を小さくした分だけ外枠体に対する内枠体の水平方向のガタツキを軽減することができる。
また、外枠体は、その外枠部が、外下壁部、上段差部及び外上壁部を備えているため、変形し難くかつ強固となる。また、内枠体においても、その内枠部が、内下壁部、中段差部及び内上壁部を備えているため、変形し難くかつ強固となる。このように、外枠体及び内枠体の強度を高めて耐久性の向上を図ることができる。
【０００６】
また、請求項２の発明に係る天井点検口は、請求項１に記載の天井点検口であって、外枠体の上段差部と内枠体の中段差部との間には気密性を有するシール部材が設けられている。
したがって、外枠体の上段差部と内枠体の中段差部との間の隙間を気密性を有するシール部材によって塞ぐことで気密を保つことができる。
【０００７】
請求項３の発明に係る天井点検口は、請求項１又は２に記載の天井点検口であって、外枠体には、その外下壁部の下端部において天井板の開口部の下端縁に向けて張り出す係合縁が形成される一方、内枠体には、その内下壁部の下端部において、前記係合縁を覆う張出覆い縁が形成されている。
したがって、外枠体に対し内枠体が閉じられた状態において、内枠体の張出覆い縁によって、外枠体の係合縁を覆って隠蔽することができ、外観意匠が向上する。
【０００８】
請求項４の発明に係る天井点検口は、請求項３に記載の天井点検口であって、外枠体の係合縁と、内枠体の張出覆い縁との間には気密性を有するシール部材が設けられている。
したがって、外枠体の係合縁と、内枠体の張出覆い縁との間の隙間を気密性を有するシール部材によって塞ぐことで気密を保つことができる。
【０００９】
請求項５の発明に係る天井点検口は、請求項１〜４のいずれか一項に記載の天井点検口であって、開閉用アームの長手方向の一端部は、内枠体のコーナ部に接近する側において、同内枠体の内上壁部側に回動軸を中心として回動可能に装着され、前記開閉用アームの他端部には、前記内枠体のコーナ部から離反する側において、外枠体の外上壁部側に配設された開口部を有する受止め部に挿脱可能に差し込まれる連結軸が組み付けられている。
したがって、外枠体に対し内枠体を開放する際、内枠体は、その自重に基づいて、開閉用アームの回動軸を支点として下向きに回動する一方、開閉用アームは、その連結軸が外枠体の受止め部に沿って移動しながら、その連結軸を支点として下向きに回動する。これによって、外枠体に対し内枠体を円滑に開放することができる。
【００１０】
請求項６の発明に係る天井点検口は、請求項５に記載の天井点検口であって、外枠体の外上壁部に対し、開閉用アームの連結軸が挿脱可能に差し込まれる開口部を有する受止め部が切り欠き状の受止め溝によって形成されている。
したがって、外枠体の外上壁部に対し切り欠き状の受止め溝を形成することによって、開閉用アームの連結軸が挿脱可能が開口部を有する受止め部を容易に構成することができる。
【００１１】
請求項７の発明に係る天井点検口は、請求項５に記載の天井点検口であって、外枠体の外上壁部の内側には受止め部材が装着され、その受止め部材には、開閉用アームの連結軸が挿脱可能に差し込まれる開口部を有する受止め部を構成する切り欠き状の受止め溝が形成されている。
したがって、受止め部材に受止め部を構成する切り欠き状の受止め溝を形成することによって、外枠体の外上壁部に直接的に受止め溝を形成する場合と異なり、外上壁部の強度が低下する不具合を防止することができるとともに、受止め溝の加工も容易となる。
【００１２】
請求項８の発明に係る天井点検口は、請求項５、又は６、又は７のいずれか一項に記載の天井点検口であって、受止め部は、外枠体の下端部開口縁と、開閉用アームの連結軸の中心とを結ぶ線のほぼ延長線上に設けられ、前記外枠体に対し内枠体が閉止された状態にあるとき、前記開閉用アームの回動軸の中心と前記外枠体の下端部開口縁との距離をＬ１とし、前記開閉用アームの連結軸と回動軸との中心間距離をＬ２とする一方、前記外枠体に対し内枠体を開放する際に前記受止め部に沿って移動する前記連結軸の中心と前記外枠体の下端部開口縁までの距離をＬとしたときに、Ｌ≧Ｌ１＋Ｌ２の関係が確保できるように、前記受止め部の長さが設定されている。
したがって、外枠体に対し内枠体が開放される際、開閉用アームの連結軸が受止め部に沿って不足なく移動することができ、外枠体に対し内枠体を円滑に開放することができる。
【００１３】
請求項９の発明に係る天井点検口は、請求項５、又は６、又は７、又は８のいずれか一項に記載の天井点検口であって、外枠体の外上壁部には、受止め部の開口部から開閉用アームの連結軸が抜け出ることを防止するための弾性体よりなる抜止部材が設けられ、前記抜止部材は、その弾性変形によって前記開閉用アームの連結軸を抜け出しを許容する構成にしてある。
したがって、外枠体に対する内枠体の開閉動作時に開閉用アームの連結軸が受止め部の開口部から不測に抜け出ることを防止することができ、外枠体に対し内枠体が離脱・落下する不具合を防止することができる。
【００１４】
請求項１０の発明に係る天井点検口は、請求項１〜９のいずれか一項に記載の天井点検口であって、外上壁部と内上壁部との間の隙間内おいて開閉用アームがほぼ水平状態で配設されている。
したがって、外上壁部と内上壁部との高さ寸法をそれぞれ小さくすることが可能となり、その分だけ天井点検口の小型・軽量化を図ることが可能となる。
【００１５】
請求項１１の発明に係る天井点検口は、請求項１〜１０のいずれか一項に記載の天井点検口であって、外枠体は、その外枠部が縦横の各外枠材によって形成されるとともに、これら縦横の各外枠材が外枠コ−ナ具によって矩形に枠組みされることによって構成され、内枠体は、その内枠部が縦横の各内枠材によって形成されるとともに、これら縦横の各内枠材が内枠コ−ナ具によって矩形に枠組みされることによって構成されている。
したがって、縦横の各外枠材が外枠コ−ナ具によって矩形に枠組みされることによって外枠体が容易に構成される。
また、縦横の各内枠材が内枠コ−ナ具によって矩形に枠組みされることによって内枠体が容易に構成される。
【００１６】
請求項１２の発明に係る天井点検口は、請求項１１に記載の天井点検口であって、内枠体の内上壁部の外側には、外向きに開口する嵌込み溝が凹設され、内枠コ−ナ具は直角状をなす翼片を有し、これら翼片が前記隣接する内枠材の嵌込み溝にそれぞれ差し込まれて固定されることによって内枠体が枠組され、前記内枠コ−ナ具の一方の翼片に対し開閉用アームの長手方向の一端部が回動軸によって回動可能に装着されている。
したがって、内枠コ−ナ具の一方の翼片に対し、回動軸によって開閉用アームの一端部が装着され、同開閉用アームの他端部の連結軸が外枠体の受止め部に挿入されて組み付けられる。このため、外枠体の外上壁部と内枠体の内上壁部との間の隙間内に対する、一対の開閉用アームの組付性の向上を図ることができる。
【００１７】
請求項１３の発明に係る天井点検口は、請求項１１に記載の天井点検口であって、隣接する内枠材の内上壁部のコーナ部近傍には、外側に向けてコーナ係合片がそれぞれ切り起し状に形成され、内枠コ−ナ具は直角状をなしかつ前記各コーナ係合片に対応するスリット状の係合溝がそれぞれ設けられた翼片を有し、これら翼片が、その係合溝において前記コーナ係合片の上方から差し込まれて固定されることによって内枠体が枠組される一方、前記隣接する内枠材のうち、一方の内枠材の内上壁部のコーナ部寄り外側面には、開閉用アームの長手方向の一端部を回動軸によって回動可能に装着するための座部が突設されている。
したがって、隣接する内枠材の内上壁部の各コーナ係合片の上方から内枠コ−ナ具の翼片を、その係合溝において差し込んで固定することによって内枠体を矩形に枠組することができ、内枠体の枠組み作業が容易となる。
また、内上壁部のコーナ部寄り外側面に突設されている座部に対し開閉用アームの長手方向の一端部を回動軸によって回動可能に装着することができる。
【００１８】
【発明の実施の形態】
（実施の形態１）
この発明の実施の形態１を図１〜図１４にしたがって説明する。
天井点検口を平面で表した図７、及び図７のＩＩＩ−ＩＩＩ線に基づく断面で表した図３において、天井板１に開口された開口部２に装着される天井点検口３０は、外枠体３１と、その外枠体３１の開口部に対し開閉用アーム９０によって開閉可能に装着された内枠体５１と、外枠体３１と内枠体５１の間に跨って配設され内枠体５１を閉じ状態に閉止する閉止手段をなす下止め部材１１０及び施錠部材１２０とを備えている。
なお、説明の便宜上、天井板１の開口部２の中心側を内、反対側を外として説明する。また、図５に示すように、天井板１の上方（奥側）には、その開口部２の近傍において野縁３が配設され、その野縁３上には断面チャンネル状の取付用受け部材４が配設されている。
【００１９】
図１、図２、及び図７に示すように、外枠体３１は、その外枠部をなす縦横の各外枠材３２によって矩形に枠組み構成されている。これら縦横の各外枠材３２は、アルミ合金等の軽合金の押出型材や、ステンレス鋼板等の金属板の折曲げ加工材等によって略同一の横断面形状に形成されている。
そして、各外枠材３２は、天井板１の開口部２の内周面に沿って略平行する外下壁部３３と、その外下壁部３３の上端から内側に向けて若干張り出された上段差部３４と、その上段差部３４の張り出し端部から上方に向けて垂直状に設けられた外上壁部３５と、外下壁部３３の下端から天井板１の下面に向けて張り出された係合縁３８とを備えて断面略Ｗ字状に形成されている。
【００２０】
また、各外枠材３２の外上壁部３５の内側の下端部から上端部にわたって蟻溝状をなす嵌込み溝３７が内側に開口して形成されている。この嵌込み溝３７の上下の開口縁には開口突縁３９がそれぞれ形成されている。
図２に示すように、各外枠材３２の長手方向の両端面は、４５度の角度をもって切断されている。そして、各外枠材３２の端部の突き合わせコーナ部において、相互の嵌込み溝３７に跨って外枠コ−ナ具４０が差し込まれながら、隣接する外枠材３２の端部が９０度の角度をもって突き合わされ、その外枠コ−ナ具４０によって結合されることで、矩形状に枠組み保持された外枠体３１が構成される。
【００２１】
すなわち、図８と図９に示すように、前記外枠コ−ナ具４０は、隣接する外枠材３２のコーナ部において、その相互の嵌込み溝３７に差し込まれる翼片４１を直角状に備え、これら各翼片４１の上下部には、切り欠き状の係合部４２が形成されている。
そして、各外枠材３２の端部がなす４つのコーナ部において、それぞれ外枠コ−ナ具４０の各翼片４１が各外枠材３２の嵌込み溝３７に差し込まれる。その後、各外枠材３２の嵌込み溝３７の開口突縁３９の一部３９ａが、各翼片４１の係合部４２に向けてかしめられることで、各外枠材３２がなす４つのコーナ部が外枠コ−ナ具４０によってそれぞれ結合され、これによって外枠体３１が矩形に枠組み構成される。
【００２２】
図５に示すように、外枠体３１は、前記天井板１の下方からその開口部２に嵌込まれ、前記取付用受け部材４に対し支持手段１０によって取り付けられる。
外枠体３１を枠組み構成している縦横の各外枠材３２のうち、一方で対向する両外枠材３２（この実施の形態１では図３に向かって左右に位置する両外枠材３２）の外上壁部３５には、図５に示すように、支持手段１０に対する所要数の角孔状の取付孔３５ａが貫設されている。
支持手段１０は、取付孔３５ａの数に対応する数の吊下部材１１と支持ボルト１５とを備えている。吊下部材１１は、上下方向の吊下片１２と、その吊下片１２の上端から直角状に折り曲げられた支持片１４とを有して略逆Ｌ字状をなしている。そして、吊下片１２には、外上壁部３５の取付孔３５ａに差し込まれて係合する係止爪１３が上向き傾斜状をなして切り起こし状に形成されている。
また、吊下部材１１の支持片１４にはネジ孔が貫設され、そのネジ孔には支持ボルト１５が上下方向に進退可能に螺合されている。
【００２３】
すなわち、天井板１の開口部２に外枠体３１が嵌込まれると共に、吊下部材１１の係止爪１３が外枠体３１の外上壁部３５の取付孔３５ａに差し込まれて係合される。さらに、取付用受け部材４上に支持ボルト１５が、その下端において設置される。この状態において、支持ボルト１５がねじ込まれることで、外枠体３１の係合縁３８が天井板１の下面に当接する位置まで吊り上げられる。これによって、天井板１の開口部２に対し外枠体３１が支持手段１０によって吊り下げ保持されるようになっている。
なお、吊下部材１１を安定よく支持するために、嵌込み溝３７の上の開口突縁３９に対し吊下部材１１の吊下片１２の一部が段差に形成されて係合している。
【００２４】
図３と図７に示すように、前記外枠体３１の枠開口部には、一方向に長い一対の開閉用アーム９０によって内枠体５１が開閉及び着脱可能に組み付けられ、かつ閉止手段としての下止め部材１１０及び施錠部材１２０によって閉じ状態に保持されている。
図１と図２に示すように、内枠体５１は、その内枠部をなす縦横の各内枠材５２によって矩形に枠組みされて構成されている。縦横の各内枠材５２は、アルミ合金等の軽合金の押出型材やステンレス鋼板等の金属板の折曲げ加工材等によって略同一の断面形状に形成されている。
【００２５】
前記各内枠材５２は、外枠体３１の外下壁部３３の内側に所定の隙間をもって略平行する内下壁部５３と、その内下壁部５３の上端から外枠体３１の上段差部３４の下面に沿って所定の隙間を隔てて張り出された中段差部５４と、外上壁部３５の内側に所定の隙間をもって略平行しかつ中段差部５４の張り出し端から上方に向けて垂直状に設けられた内上壁部５５と、内下壁部５３の下端から外枠体３１の係合縁３８を覆うようにして張り出された張出覆い縁５８とを備えて断面略Ｗ字状に形成されている。
そして、内枠体５１の張出覆い縁５８によって外枠体３１の外下壁部３３と内枠体５１の内下壁部５３との間の隙間が塞がれるようになっている。
【００２６】
前記各内枠材５２の内上壁部５５の外側の下端部から上端部にわたって蟻溝状をなす嵌込み溝５７が外側に開口して形成されている。この嵌込み溝５７の上下の開口縁には開口突縁５９がそれぞれ形成されている。
図２に示すように、各内枠材５２の両端面は４５度の角度をもって切断され、これら各内枠材５２の端部の突き合わせコーナ部において、相互の嵌込み溝５７に跨って内枠コ−ナ具７０が差し込まれながら、隣接する内枠材５２が９０度の角度をもって突き合わされ、その内枠コ−ナ具７０によって結合されることで、矩形に枠組みされた内枠体５１が構成される。
【００２７】
すなわち、図１０と図１１に示すように、内枠コ−ナ具７０は、翼片７１を直角状に備え、これら各翼片７１の上下部には、切り欠き状の係合部７２がそれぞれ形成されている。
そして、各内枠材５２の端部がなす４つのコーナ部において、それぞれ内枠コ−ナ具７０の各翼片７１が各内枠材５２の嵌込み溝５７に差し込まれ、その嵌込み溝５７の開口突縁５９の一部５９ａが係合部７２に向けてかしめられることで、内枠体５１が矩形に枠組み構成される。
また、この実施の形態１において、４つの内枠コ−ナ具７０のうち、図７に向かって右側に位置する２つの内枠コ−ナ具７０には、その各一方の翼片７１において、一対の開閉用アーム９０の長手方向の一端部が回動軸９１によってそれぞれ回動可能に組み付けられている。これら一対の開閉用アーム９０については、後に詳細に説明する。
【００２８】
図５と図７に示すように、前記内枠体５１の内下壁部５３がなす内枠開口部には、その開口部を閉じるようにして内蓋板８０が嵌込まれ、その内蓋板８０は、所要数の蓋板支持部材８１によって支持されている。
図５に示すように、蓋板支持部材８１は、内枠体５１の内上壁部５５の内面に沿って取り付けられる取付部８２と、その取付部８２下端から内側に向けて張り出された支持部８４とを備えて断面略Ｌ字状に形成されている。そして、蓋板支持部材８１の支持部８４の下面には内蓋板８０がビス、釘、蓋押え具等の止着手段（図示しない）によって固定されている。
また、この実施の形態１において、厚さ寸法が各種異なる様々な内蓋板８０に対応できるように、内枠体５１の内上壁部５５の内面に沿って蓋板支持部材８１が上下方向に移動調整可能に取り付けられるようになっている。
【００２９】
すなわち、図５と図６に示すように、内枠体５１の内上壁部５５には、上下方向の長孔６１が形成されるとともに、その内上壁部５５の内側には、複数の係止突起８８が突設されている。
これに対し、蓋板支持部材８１の取付部８２の所定位置にはネジ孔が形成されるとともに、取付部８２の外側面の上下両端部には、内枠体５１の内上壁部５５の複数の係止突起８８に選択的に掛け止めされて係合する係合突起８３がそれぞれ突設されている。
そして、内枠体５１の内上壁部５５の複数の係止突起８８のうち、所望する係止突起８８に対し、蓋板支持部材８１の係合突起８３を掛け止めして係合させる。この状態のもとで、内枠体５１の内上壁部５５の外側からその長孔６１を通して蓋板支持部材８１のネジ孔にビス８５をねじ込むことによって、内枠体５１の内上壁部５５の内側に対し、蓋板支持部材８１が、所望とする内蓋板８０に対応する高さ位置に取り付けられようになっている。
【００３０】
図３に示すように、前記外枠体３１に対し内枠体５１を閉じ状態に保持するため閉止手段をなす下止め部材１１０と施錠部材１２０とは、内枠体５１の縦横の各内枠材５２のうち、一方で相対する両内枠材５２にそれぞれ装着されている。
この実施の形態１において、内枠体５１の縦横の各内枠材５２のうちの一方（図３に向かって右側）の内枠材５２の内上壁部５５の外側上部に下止め部材１１０が取り付けられている。この下止め部材１１０は、内枠材５２の内上壁部５５の外側にビス１１２によって取り付けられた基板部１１１と、その基板部１１１の上端から内上壁部５５の上縁を僅かに越えて略水平状に延出された係合片１１３と、その係合片１１３の先端から上向き傾斜状に延出された滑走片１１４とを一体に備えている。
【００３１】
また、下止め部材１１０が取り付けられる内枠材５２と対向する（図３に向かって左側に位置する）内枠材５２には、その内上壁部５５の内側において施錠部材１２０が錠ブラッケト１２５によって回動操作可能に組み付けられている。
図３と図７に示すように、施錠部材１２０は、上下方向の軸体１２１と、施錠板１３０とを一体状に備えている。そして、施錠部材１２０は、その軸体１２１において、平断面がほぼΩ状をなす錠ブラケット１２５の軸受け部に回動可能に嵌挿されて組み付けられている。
【００３２】
施錠部材１２０の施錠板１３０は、錠ブラッケト１２５の軸受け部の上方に位置して、かつ軸体１２１の上端にかしめ部１２２によって略水平状に固定されている。この施錠板１３０の先端部は内上壁部５５に貫設された貫通孔１４４を通して外枠体３１の外上壁部３５に貫設された閉止孔１４５に挿脱可能に差し込まれる位置まで延出されている。そして、施錠板１３０は、軸体１２１と一体状をなして回動操作されることで、外上壁部３５の閉止孔１４５に差し込まれて係合する施錠位置と、その施錠位置から略９０度回動されかつ外上壁部３５の閉止孔１４５から抜け出て外れる解錠位置とに配置切り換えされるようになっている。
また、施錠部材１２０の軸体１２１の下端部は内蓋板８０を貫通して内蓋板８０の下面から若干突出している。この軸体１２１の下端面には、その軸体１２１と共に施錠板１３０を回動操作するためのコイン等が差し込まれる回動溝１２３が凹設されている。
また、軸体１２１の下端部外周には内蓋板８０の貫通孔の下端開口部を塞ぐ塞ぎキャップ１４０が装着されている。
【００３３】
前記したように枠組み構成される外枠体３１と内枠体５１において、図４に示すように、外枠体３１の外下壁部３３から内側に向けて張り出された上段差部３４の張り出し寸法に対し、内枠体５１の内下壁部５３から内側に向けて張り出された中段差部５４の張り出し寸法が適宜に大きく設定されている。これによって、外枠体３１の外上壁部３５と内枠体５１の内上壁部５５との間に構成された隙間内において一方向に長い一対の開閉用アーム９０がほぼ水平状態をなして配設されるようになっている。
この実施の形態１において、図１、図２、及び図７に示すように、内枠体５１の４つの内枠コ−ナ具７０のうち、図７に向かって右側に位置する両内枠コ−ナ具７０の各一方の翼片７１において、一対の開閉用アーム９０の長手方向の一端部が回動軸９１によってそれぞれ回動可能に組み付けられている（図１０参照）。
また、一対の開閉用アーム９０の長手方向の他端部には、外枠体３１の外上壁部３５の内側に設けられた開口部を有する受止め部に挿脱可能に差し込まれる連結軸１００が組み付けられている。
【００３４】
すなわち、図１と図２に示すように、一対の開閉用アーム９０の長手方向の一端部に設けられる回動軸９１は、頭部９２と段付き軸部９３とを備えている。
一方、内枠コ−ナ具７０の一方の翼片７１には、外側に突出する軸用座部が形成されている。この座部の中心部には、回動軸９１の段付き軸部９３の大径軸部が嵌挿される軸孔が貫設されている。
これに対し、開閉用アーム９０の一端部寄り部分には、外側が凹みかつ内側に突出する座部が形成され、その座部の中心部には、回動軸９１の段付き軸部９３の小径軸部が嵌挿される軸孔が貫設されている。そして、内枠コ−ナ具７０の一方の翼片７１の座部の内側からその軸孔に回動軸９１の段付き軸部９３の大径軸部が嵌挿され、その段付き軸部９３の小径軸部が開閉用アーム９０の座部の軸孔に貫挿された状態において、小径軸部の先端部にかしめによってかしめ部９６が設けられることで、内枠コ−ナ具７０の一方の翼片７１の座部と、開閉用アーム９０の座部とが相互に当接した状態で、開閉用アーム９０が組み付けられている。これによって、開閉用アーム９０のほとんどの部分が、内枠材５２の内上壁部５５の外側面に接触しないように保たれ、開閉用アーム９０の回動が円滑かつ軽快になされるようになっている。
【００３５】
また、図１と図２に示すように、一対の開閉用アーム９０の長手方向の他端部寄り部分に設けられた連結軸１００は、頭部１０１と、段付き軸部１０２とを備えている。そして、開閉用アーム９０の他端部寄り部分に貫設された軸孔に、連結軸１００の段付き軸部１０２の小径軸部が挿通され、その段付き軸部１０２の小径軸部の先端部にかしめによってかしめ部１０３が設けられることで、開閉用アーム９０に連結軸１００が取り付けられている。
一方、外枠体３１の外上壁部３５の内側には、内枠体５１のコーナ部から離反する側において、開閉用アーム９０に連結軸１００が挿脱可能に差し込まれる開口部を有する受止め部が設けられている。
【００３６】
この実施の形態１において、図１と図２に示すように、外枠体３１の外上壁部３５の内側の所定位置には、嵌込み溝３７の上下の開口突縁３９の間において受止め部材１５０が取り付けられている。この受止め部材１５０は、外上壁部３５の内側面に沿ってビス１６０によって固定される基部１５１と、その基部１５１から内側に向けて直角状に折り曲げられその折り曲げ部の先端から外上壁部３５の内側面に沿って延出されかつ同外上壁部３５の内側面との間に連結軸１００の頭部１０１が差し込み可能な隙間を隔てる延出部１５２とを備えて平断面ほぼＺ字をなしている。
そして、受止め部材１５０の延出部１５２には、開閉用アーム９０の連結軸１００が挿脱可能に差し込まれる受止め部を構成する切り欠き状の受止め溝１５５が形成されている。
この受止め溝１５５の一端側（内枠体５１のコーナ部から離反する側）には、開閉用アーム９０の連結軸１００が挿脱される開口部が形成されている。
【００３７】
また、図１と図２に示すように、受止め部材１５０の受止め溝１５５は、外枠体３１の下端部開口縁と、開閉用アーム９０の連結軸１００の中心とを結ぶ線のほぼ延長線上において傾斜状をなして設けられている。
また、図１４において２点鎖線に示すように、外枠体３１に対し内枠体５１が閉止された状態において、開閉用アーム９０の回動軸９１の中心と外枠体３１の下端部開口縁との距離をＬ１とし、開閉用アーム９０の連結軸１００と回動軸９１との中心間距離をＬ２とし、外枠体３１に対し内枠体５１を開放する際に受止め溝１５５に沿って移動する連結軸１００の中心と外枠体３１の下端部開口縁までの距離をＬとしたときに、「 Ｌ≧Ｌ１＋Ｌ２ 」の関係が確保できるように、受止め溝１５５の溝長さが適宜に設定されている。
【００３８】
また、図１４において２点鎖線で示すように、外枠体３１に対し内枠体５１が開閉用アーム９０によってほぼ垂下状態をなして開放できるように、開閉用アーム９０の連結軸１００と回動軸９１との中心間距離をＬ２とし、開閉用アーム９０の回動軸９１の中心から内枠体５１の張出覆い縁５８の先端までの距離をＡとし、開閉用アーム９０の連結軸１００の中心から外枠体３１の外下壁部３３の係合縁３８までの距離をＢとしたときに、「 Ｌ２≧Ａ＋Ｂ 」の関係が確保できるように、開閉用アーム９０のアーム長さが適宜に設定されている。
【００３９】
また、外枠体３１の外上壁部３５には、受止め部材１５０の受止め溝１５５の開口部から開閉用アーム９０の連結軸１００が、その頭部１０１において抜け出ることを防止するための弾性体よりなる抜止部材１７０が設けられている。
この実施の形態１において、図１と図２に示すように、抜止部材１７０は、板ばね材よりなり、かつ弾性的に撓むように、その一端部において外枠体３１の外上壁部３５の外側面に対し、受止め部材１５０を締め付けているビス１６０によって片持ち状に共締めされている。
抜止部材１７０の自由端部には、外枠体３１の外上壁部３５に貫設された孔を通しかつ受止め部材１５０の受止め溝１５５の開口部を閉じるようにして同外上壁部３５の内側に突出する断面半円弧状に抜止部１７１が形成されている。
そして、開閉用アーム９０の連結軸１００がその頭部１０１において抜止部材１７０の抜止部１７１に当接して係合することによって、連結軸１００の不測の抜け出しが防止されるようになっている。
さらに、抜止部材１７０の抜止部１７１による係合力に抗して開閉用アーム９０の連結軸１００が押し出されることによって、受止め部材１５０の受止め溝１５５の開口部を開くようにして抜止部材１７０が弾性的に撓み、これによって連結軸１００の抜け出しを許容する構成にしてある。
【００４０】
また、この実施の形態１において、図１に示すように、内枠体５１の中段差部５４の上面には、外枠体３１の上段差部３４と内枠体５１の中段差部５４との間の隙間を塞ぐ気密性のシール部材１８０が貼り付けられている。
さらに、内枠体５１の張出覆い縁５８の上面には、外枠体３１の係合縁３８と、内枠体５１の張出覆い縁５８との間の隙間を塞ぐ気密性のシール部材１８１が設けられている。
また、各シール部材１８０、１８１は、発泡ポリエチレン、発泡ウレタン等の気密性を有する合成樹脂、ゴム等よりそれぞれ形成されている。
【００４１】
この実施の形態１の天井点検口３０は上述したように構成される。したがって、外枠体３１に対し閉じ状態に保持された内枠体５１を開く場合、まず、図１２に示すように、施錠位置にある施錠部材１２０が所定方向にほぼ９０度回動操作されて解錠位置に配置切換される。この状態において、外枠体３１に対し内枠体５１が、その下止め部材１１０の係合片１１３が外枠体３１の上縁から外れる方向（図１２に向かって左側）において僅かではあるが移動される。
その後、図１３に示すように、内枠体５１は、その自重に基づいて、開閉用アーム９０の回動軸９１を支点として下向き（図１３に向かって反時計回り方向）に回動しながら、その下止め部材１１０の滑走片１１４が外枠体３１の上縁に接して斜め下方に滑走する。この際、開閉用アーム９０は、その連結軸１００が受止め溝１５５に沿って若干移動しながら、その連結軸１００を支点として下向き（図１３に向かって時計回り方向）に回動する。
【００４２】
引き続いて、図１４に示すように、下止め部材１１０の滑走片１１４が外枠体３１の外上壁部３５の上縁を通過した後、図１４の２点鎖線で示すように、内枠体５１は、その自重に基づいて、開閉用アーム９０の回動軸９１を支点として回動するとともに、開閉用アーム９０は、その連結軸１００を支点としてほぼ垂下状をなす位置まで回動し、これによって外枠体３１に対し内枠体５１がほぼ垂下状をなして開放される。
また、前記とは逆の手順で操作されることで、外枠体３１に対し内枠体５１が閉じられる。
【００４３】
外枠体３１と内枠体５１において、外枠体３１の外下壁部３３から内側に向けて張り出された上段差部３４の張り出し寸法に対し、内枠体５１の内下壁部５３から内側に向けて張り出された中段差部５４の張り出し寸法が適宜に大きく設定されている。これによって、外枠体３１の外下壁部３３と内枠体５１の内下壁部５３との間の隙間は可及的に小さく設定しながら、外枠体３１の外上壁部３５と内枠体５１の内上壁部５５との間には、一対の開閉用アーム９０を配設するための隙間を容易に確保することができる（図４参照）。
さらに、外下壁部３３と内下壁部５３との間の隙間を小さくした分だけ外枠体３１に対する内枠体５１の水平方向のガタツキを軽減することができる。
【００４４】
また、外枠体３１は、その外枠部をなす縦横の各外枠材３２が、外下壁部３３、上段差部３４、外上壁部３５及び係合縁３８を備えて断面ほぼＷ字状をなし、変形し難くかつ強固となる。また、内枠体５１においても、その内枠部をなす縦横の各内枠材５２が、内下壁部５３、中段差部５４、内上壁部５５及び張出覆い縁５８を備えて断面ほぼＷ字状をなし、変形し難くかつ強固となる。このように、外枠体３１及び内枠体５１の強度を高めて耐久性の向上を図ることができる。
【００４５】
また、この実施の形態１において、図１０に示すように、内枠コ−ナ具７０の一方の翼片７１に対し、回動軸９１によって開閉用アーム９０の一端部が回動可能に装着され、同開閉用アーム９０の他端部の連結軸１００が外枠体３１の受止め溝１５５に挿入されて組み付けられる。このため、外枠体３１の外上壁部３５と内枠体５１の内上壁部５５との間の隙間内に対する、一対の開閉用アーム９０の組付性の向上を図ることができる。
また、開閉用アーム９０の連結軸１００に対する受止め部としての受止め溝１５５が受止め部材１５０に形成され、その受止め部材１５０が外枠体３１の外上壁部３５の内側に取り付けられる構成にしてある。このため、外上壁部３５に直接的に受止め溝１５５を形成する場合と異なり、外上壁部３５の強度が低下する不具合を防止することができるとともに、受止め溝１５５の加工も容易となる。
【００４６】
また、外枠体３１に対し、内枠体５１が開閉動作される際、外枠体３１の受止め部材１５０の受止め溝１５５の開口部は、抜止部材１７０によって弾性的に閉じられている。したがって、外枠体３１に対する内枠体５１の開閉動作時に開閉用アーム９０の連結軸１００が受止め溝１５５の開口部から不測に抜け出ることを防止することができる。このため、開閉用アーム９０の連結軸１００が受止め溝１５５から不測に抜け出ることが原因となって、外枠体３１に対し内枠体５１が離脱・落下する不具合を防止することができる。
【００４７】
また、抜止部材１７０を弾性変形させながら、開閉用アーム９０の連結軸１００を受止め溝１５５の開口部から離脱させることができる。このため、外枠体３１に対する内枠体５１の脱着操作が容易になされる。さらに、外枠体３１に対し内枠体５１を取り外すことで、天井板１の内部の配線・配管等の保守点検を容易に行うことができる。
また、外枠体３１に対し内枠体５１が閉じられた状態において、内枠体５１の張出覆い縁５８によって、外枠体３１の係合縁３８が覆われて隠蔽されるため、外観意匠が向上される。
【００４８】
また、この実施の形態１において、図１に示すように、内枠体５１の中段差部５４の上面には、外枠体３１の上段差部３４と内枠体５１の中段差部５４との間の隙間を塞ぐ気密性のシール部材１８０が貼り付けられている。さらに、内枠体５１の張出覆い縁５８の上面には、外枠体３１の係合縁３８と、内枠体５１の張出覆い縁５８との間の隙間を塞ぐ気密性のシール部材１８１が設けられている。
このため、前記各シール部材１８０、１８１によって外枠体３１と内枠体５１とを２重にシールして気密を保つことができる。
【００４９】
また、この実施の形態１において、外枠体３１に対し内枠体５１が閉止された状態において、開閉用アーム９０の回動軸９１の中心と外枠体３１の下端部開口縁との距離をＬ１とし、開閉用アーム９０の連結軸１００と回動軸９１との中心間距離をＬ２とし、外枠体３１に対し内枠体５１を開放する際に受止め溝１５５に沿って移動する連結軸１００の中心と外枠体３１の下端部開口縁までの距離をＬとしたときに、「 Ｌ≧Ｌ１＋Ｌ２ 」の関係が確保できるように、受止め溝１５５の溝長さが適宜に設定されている。このため、外枠体３１に対し内枠体５１が開放される際、開閉用アーム９０の連結軸１００が受止め溝１５５に沿って不足なく移動することができ、外枠体３１に対し内枠体５１が円滑に開放される（図１４参照）。
【００５０】
また、この実施の形態１において、開閉用アーム９０の連結軸１００と回動軸９１との中心間距離をＬ２とし、開閉用アーム９０の回動軸９１の中心から内枠体５１の張出覆い縁５８の先端までの距離をＡとし、開閉用アーム９０の連結軸１００の中心から外枠体３１の外下壁部３３の係合縁３８までの距離をＢとしたときに、「 Ｌ２≧Ａ＋Ｂ 」の関係が確保できるように、開閉用アーム９０のアーム長さが適宜に設定されている。このため、図１４において２点鎖線で示すように、外枠体３１に対し内枠体５１が開閉用アーム９０を介してほぼ垂下状態をなす開放状態まで良好に開放することができる。
【００５１】
なお、この発明は前記実施の形態１に限定するものではない。例えば、図１５〜図２６に示す各実施の形態２〜８のように変更してもよい。
（実施の形態２）
図１５と図１６に示す実施の形態２においては、外枠体３１の外上壁部３５の内側に形成される外枠コ−ナ具４０に対する嵌込み溝３７の開口幅を適宜に狭くし、その嵌込み溝３７の一部を開閉用アーム９０の連結軸１００に対する受止め溝１５５として機能するように構成したものである。
また、嵌込み溝３７の所定位置、言い換えると、受止め溝１５５の一端部には連結軸１００の頭部１０１に当接してこれ以上の連結軸１００の移動を阻止するストッパ部１８６が設けられている。このストッパ部１８６は、外枠体３１の外上壁部３５の一部がカシメ等によって内側（嵌込み溝３７側）に向けて突出されることによって容易に設けることができる。
さらに、嵌込み溝３７の所定位置、言い換えると、受止め溝１５５の他端部側において、その嵌込み溝３７の上下の両開口突縁３９のうち、上側の開口突縁３９の一部を切除して連結軸１００を挿脱可能な開口部１８５を形成している。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５２】
（実施の形態３）
また、図１７〜図１９に示す実施の形態３においては、内枠体５１の内枠コ−ナ具７０の一方の翼片７１に回動軸９１によって装着された開閉用アーム９０の他端近傍部を上方に向けて傾斜状に屈曲し、その先端部に連結軸１００を取り付けている。
一方、外枠体３１の外上壁部３５の内側に取り付けられた受止め部材１５０には、開閉用アーム９０の連結軸１００を挿脱可能に受け止める開口部を上端に有する受止め溝１５５をほぼＬ字状に形成したものである。但しこの場合、受止め溝１５５の上端開口部に対し開閉用アーム９０の連結軸１００を挿脱する際、外上壁部３５の嵌込み溝３７の上側の開口突縁３９が妨害物とならないようにその上側の開口突縁３９の一部を切除１８７している。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５３】
（実施の形態４）
また、図２０と図２１に示す実施の形態４においては、外枠体３１の外上壁部３５の外側面に外枠コ−ナ具４０に対する嵌込み溝３７を形成したものである。その他の構成は前記実施の形態３と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５４】
（実施の形態５）
また、図２２と図２３に示す実施の形態５においては、外枠体３１の外上壁部３５の内側に取り付けられた受止め部材１５０に対し、開閉用アーム９０の連結軸１００を挿脱可能に受け止める受止め溝１５５を実施の形態１とは逆方向の内枠コ−ナ具７０に接近する方向に上向き傾斜状に形成するとともに、その受止め溝１５５の先端を受止め部材１５０上端に開口したものである。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５５】
（実施の形態６）
また、図２４に示す実施の形態６においては、内枠体５１の内下壁部５３の外側面に第２の内枠コ−ナ具７０ａに対応する嵌込み溝５７ａを形成し、内枠体５１を強固に枠組み構成したものである。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５６】
（実施の形態７）
また、図２５に示す実施の形態７においては、内枠体５１の内下壁部５３の内側面に第２の内枠コ−ナ具７０ｂに対応する嵌込み溝５７ｂを形成し、内枠体５１を強固に枠組み構成したものである。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５７】
（実施の形態８）
また、図２６に示す実施の形態８においては、天井板１裏側の所定高さ位置に断面コの字状の取付部材６を配設する一方、外枠体３１の外上壁部３５に対し上下方向に長い吊下部材１１の下端部をネジ１８によって固定している。そして、吊下部材１１の上部に締付部材２４をボルト２８とナット２９によって上下方向に位置調整可能に締め付けことによって取付部材６の上片６ａに対し外枠体３１を取り付けたものである。その他の構成は前記実施の形態１又は２と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５８】
（実施の形態９）
また、図２７〜図２９に示す実施の形態９においては、内枠体５１を構成する縦横の各内枠材５２のうち、隣接する内枠材５２の内上壁部５５のコーナ部近傍において、平面形状ほぼＬ字状のコーナ係合片５５ａを外側に向けてそれぞれ切り起し状に形成している。
一方、内枠コ−ナ具７０の直角状をなす各翼片７１の所定位置には、その下端から上端部近傍に向けて各コーナ係合片５５ａに対応するスリット状の係合溝７１ａをそれぞれ切り欠き形成している。そして、隣接する内枠材５２の内上壁部５５の各コーナ係合片５５ａの上方から内枠コ−ナ具７０の各翼片７１を、その係合溝７１ａにおいて差し込んだ状態において、各コーナ係合片５５ａの先端部を内枠コ−ナ具７０の各翼片７１に向けてかしめることによって、固定し、内枠体５１を矩形に枠組構成したものである。
また、内枠体５１の内下壁部５３の外側面には、第２の内枠コ−ナ具７０ａに対応する嵌込み溝５７ａを形成し、内枠体５１を強固に枠組み構成している。
また、内枠体５１を構成する縦横の各内枠材５２のうち、一方で対向する内枠材５２の内上壁部５５のコーナ部寄り外側面に座部５５ｂを突設し、その座部５５ｂに対し、開閉用アーム９０の長手方向の一端部を回動軸９１によって回動可能に装着している。その他の構成は前記実施の形態１又は２と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００５９】
（実施の形態１０）
また、図３０に示す実施の形態１０においては、内枠体５１を構成する縦横の各内枠材５２のうち、所要とする内枠材５２の内上壁部５５の外側において施錠部材１２０を錠ブラッケト１２５によって回動操作可能に組み付けたものである。
施錠部材１２０の施錠板１３０は、錠ブラッケト１２５の軸受け部の上方に位置して、かつ外枠体３１の外上壁部３５の上縁に係脱可能に係合して、外枠体３１に対し内枠体５１を施錠する。
また、施錠部材１２０の軸体１２１の下端部は、内枠体５１の中段差部５４及び内蓋板８０を貫通して内蓋板８０の下面から若干突出している。この軸体１２１の下端面には、その軸体１２１と共に施錠板１３０を回動操作するためのコイン等が差し込まれる回動溝１２３が凹設されている。その他の構成は前記実施の形態１と同様にして構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。
【００６０】
【発明の効果】
以上述べたように、この発明によれば、外枠体に対する内枠体の水平方向のガタツキを防止することができるとともに、外枠体と内枠体との間に開閉用アームを配設するためのスペースを容易に確保することができる。しかも、外枠体及び内枠体の各枠部の強度を高めて耐久性の向上を図ることができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１の天井点検口の外枠体、内枠体及び開閉用アームの関係を示す図７のＩ−Ｉ線に基づく断面図である。
【図２】同じく外枠体、内枠体及び開閉用アームの関係を示す図１のＩＩ−ＩＩ線に基づく断面図である。
【図３】同じく外枠体、内枠体、下止め部材及び施錠部材の関係を示す図７のＩＩＩ−ＩＩＩ線に基づく断面図である。
【図４】同じく外枠体、内枠体及び開閉用アームの関係を示す図７のＩＶ−ＩＶ線に基づく断面図である。
【図５】同じく外枠体の吊下げ手段並びに内枠体の蓋板支持部材を示す図７のＶ−Ｖ線に基づく断面図である。
【図６】同じく内枠体に対し蓋板支持部材によって異なる内蓋板を装着した実施態様を示す断面図である。
【図７】同じく天井点検口全体を簡略化して示す平面図である。
【図８】同じく外枠コ−ナ具を示す斜視図である。
【図９】同じく縦横の各外枠材が外枠コ−ナ具によって枠組みされた外枠体のコーナ部を示す説明図である。
【図１０】同じく内枠コ−ナ具を示す斜視図である。
【図１１】同じく縦横の各内枠材が内枠コ−ナ具によって枠組みされて内枠体のコーナ部を示す説明図である。
【図１２】同じく外枠体に対し内枠体を開放するに先だって施錠部材を解錠した状態を示す断面図である。
【図１３】同じく外枠体の外上壁部の上縁に沿って下止め部材を滑走しながら内枠体を所定の開度まで開いた状態を示す説明図である。
【図１４】同じく外枠体の外上壁部を下止め部材が通過した後の内枠体を開放状態を示す断面図である。
【図１５】この発明の実施の形態２の外枠体、内枠体及び開閉用アームの関係を示す断面図である。
【図１６】同じく図１５のＸＶＩ−ＸＶＩ線に基づく断面図である。
【図１７】この発明の実施の形態３の外枠体、内枠体及び開閉用アームの関係を示す断面図である。
【図１８】同じく図１７のＸＶＩＩＩ−ＸＶＩＩＩ線に基づく断面図である。
【図１９】同じく図１７のＸＩＸ−ＸＩＸ線に基づく断面図である。
【図２０】この発明の実施の形態４の外枠体、内枠体及び開閉用アームの関係を示す断面図である。
【図２１】同じく図２０のＸＸＩ−ＸＸＩ線に基づく断面図である。
【図２２】この発明の実施の形態５の外枠体、内枠体及び開閉用アームの関係を示す断面図である。
【図２３】同じく図２２のＸＸＩＩＩ−ＸＸＩＩＩ線に基づく断面図である。
【図２４】この発明の実施の形態６を示す断面図である。
【図２５】この発明の実施の形態７を示す断面図である。
【図２６】この発明の実施の形態８を示す断面図である。
【図２７】この発明の実施の形態９の内枠体のコーナ部を示す斜視図である。
【図２８】同じく外枠体を破断して内枠体を側面から表した部分断面図である。
【図２９】同じく図２８のＸＸＩＸ−ＸＸＩＸ線に基づく断面図である。
【図３０】この発明の実施の形態１０を示す断面図である。
【符号の説明】
１ 天井板
２ 開口部
３０ 天井点検口
３１ 外枠体
３２ 外枠材（外枠部）
３３ 外下壁部
３４ 上段差部
３５ 外上壁部
３７ 嵌込み溝
３８ 係合縁
４０ 外枠コ−ナ具
４１ 翼片
５１ 内枠体
５２ 内枠材（内枠部）
５３ 内下壁部
５４ 中段差部
５５ 内上壁部
５７ 嵌込み溝
５８ 張出覆い縁
７０ 内枠コ−ナ具
７１ 翼片
９０ 開閉用アーム
９１ 回動軸
１００ 連結軸
１１０ 下止め部材（閉止手段）
１２０ 施錠部材（閉止手段）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ceiling inspection port that is attached to an opening formed in a ceiling plate in order to maintain and inspect various wirings and pipes disposed on the ceiling of a building such as a building, a ship, and an underground passage. About.
[0002]
[Prior art]
Conventionally, an outer frame body that is attached to an opening portion that is opened in the ceiling plate, an inner frame body that is assembled to the opening portion of the outer frame body so as to be opened and closed by a pair of opening and closing arms that are long in one direction, 2. Description of the Related Art A ceiling inspection port having a structure including a closing unit that is detachably disposed between a frame body and an inner frame body and that closes the inner frame body in a closed state is known.
Further, this type of ceiling inspection port is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-64586.
[0003]
[Problems to be solved by the invention]
By the way, in order to secure a space for arranging a pair of long opening / closing arms in one direction between the outer frame portion of the outer frame body and the inner frame portion of the inner frame body, It is necessary to increase the gap between the two to a predetermined value or more. Then, there is a problem that the inner frame is easily rattled in the horizontal direction with respect to the outer frame by an amount corresponding to a gap provided between the outer frame and the inner frame.
[0004]
An object of the present invention is to provide an opening / closing arm between an outer frame body and an inner frame body while preventing the inner frame body from rattling in the horizontal direction with respect to the outer frame body in view of the conventional problems. It is to provide a ceiling inspection port that can easily secure the space.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a ceiling inspection port according to the invention of claim 1 includes an outer frame body attached to an opening of a ceiling plate, and a pair of opening and closing long in one direction with respect to the opening of the outer frame body An inner frame that can be opened and closed by an arm, and a closing means that is detachably disposed across the outer frame and the inner frame, and closes the inner frame in a closed state. The outer frame body has an outer lower wall portion along the inner peripheral surface of the opening of the ceiling plate, and an inner side from the outer lower wall portion, in the cross section of the outer frame portion. The inner frame body has a cross section of the inner lower frame portion of the outer lower wall portion, and an upper upper wall portion provided upward from the stepped portion. An inner lower wall portion along the inner peripheral surface, a middle step portion projecting from the inner lower wall portion along the lower surface of the upper step portion, and the outer upper wall portion An inner upper wall portion provided along an inner peripheral surface and directed upward from the middle step portion, and the inner lower wall with respect to a projecting dimension of the upper step portion projecting from the outer lower wall portion The projecting dimension of the middle stepped part projecting from the part is set to be large, whereby the opening / closing arm is disposed in the gap formed between the outer upper wall part and the inner upper wall part. Yes.
Accordingly, when the inner frame body is opened with respect to the outer frame body, the inner frame body is opened with respect to the outer frame body via the opening / closing arm in a state where the engagement by the closing means is released.
In addition, in the outer frame body and the inner frame body, from the inner lower wall portion of the inner frame body toward the inner side with respect to the projecting dimension of the upper stepped portion projecting inward from the outer lower wall portion of the outer frame body. The projecting dimension of the projecting middle step portion is set to be appropriately large. As a result, the gap between the outer lower wall portion of the outer frame body and the inner lower wall portion of the inner frame body is set as small as possible, while the outer upper wall portion of the outer frame body and the inner upper portion of the inner frame body. A gap for arranging the pair of opening and closing arms can be easily secured between the wall portions.
Further, it is possible to reduce the backlash in the horizontal direction of the inner frame relative to the outer frame by an amount corresponding to a reduction in the gap between the outer lower wall and the inner lower wall.
Moreover, since the outer frame part is provided with the outer lower wall part, the upper level | step-difference part, and the outer upper wall part, it is hard to deform | transform and becomes strong. Further, in the inner frame body, since the inner frame portion includes the inner lower wall portion, the middle step portion, and the inner upper wall portion, it is difficult to be deformed and becomes strong. Thus, the strength of the outer frame body and the inner frame body can be increased to improve the durability.
[0006]
The ceiling inspection port according to the invention of claim 2 is the ceiling inspection port according to claim 1, wherein airtightness is provided between the upper step portion of the outer frame body and the middle step portion of the inner frame body. The sealing member which has is provided.
Therefore, airtightness can be maintained by closing the gap between the upper step portion of the outer frame body and the middle step portion of the inner frame body with the sealing member having airtightness.
[0007]
A ceiling inspection port according to the invention of claim 3 is the ceiling inspection port according to claim 1 or 2, wherein the outer frame body has a lower end edge of the opening of the ceiling plate at the lower end portion of the outer lower wall portion thereof. On the other hand, the inner frame body is formed with an overhanging covering edge for covering the engaging edge at the lower end portion of the inner lower wall portion.
Therefore, in a state where the inner frame body is closed with respect to the outer frame body, the engagement edge of the outer frame body can be covered and concealed by the overhanging covering edge of the inner frame body, and the appearance design is improved.
[0008]
The ceiling inspection port according to the invention of claim 4 is the ceiling inspection port according to claim 3, wherein airtightness is provided between the engaging edge of the outer frame body and the overhanging edge of the inner frame body. The sealing member which has is provided.
Therefore, airtightness can be maintained by closing the gap between the engaging edge of the outer frame body and the overhanging covering edge of the inner frame body with the sealing member having airtightness.
[0009]
The ceiling inspection port according to the invention of claim 5 is the ceiling inspection port according to any one of claims 1 to 4, wherein one end portion of the opening / closing arm in the longitudinal direction is provided at a corner portion of the inner frame body. On the approaching side, the inner frame is mounted on the inner upper wall portion of the inner frame so as to be rotatable about a rotation axis, and the other end of the opening / closing arm is separated from the corner of the inner frame. On the side, a connecting shaft that is removably inserted into a receiving portion having an opening disposed on the outer upper wall portion side of the outer frame body is assembled.
Therefore, when the inner frame body is opened with respect to the outer frame body, the inner frame body rotates downward with the pivot shaft of the opening / closing arm as a fulcrum, based on its own weight, while the opening / closing arm is connected to it. While the shaft moves along the receiving portion of the outer frame body, the shaft rotates downward with the connecting shaft as a fulcrum. As a result, the inner frame can be smoothly opened with respect to the outer frame.
[0010]
The ceiling inspection port according to the invention of claim 6 is the ceiling inspection port according to claim 5, wherein the connecting shaft of the opening / closing arm is detachably inserted into the outer upper wall portion of the outer frame body. The receiving part which has a part is formed by the notch-shaped receiving groove.
Therefore, by forming a notch-shaped receiving groove in the outer upper wall portion of the outer frame body, it is possible to easily configure a receiving portion having an opening so that the connecting shaft of the opening / closing arm can be inserted and removed. it can.
[0011]
The ceiling inspection port according to the invention of claim 7 is the ceiling inspection port according to claim 5, wherein a receiving member is mounted on the inner side of the outer upper wall portion of the outer frame body, A notch-shaped receiving groove that forms a receiving portion having an opening into which the connecting shaft of the opening / closing arm is detachably inserted is formed.
Therefore, unlike the case where the receiving groove is formed directly on the outer upper wall portion of the outer frame body by forming the notch-shaped receiving groove forming the receiving portion in the receiving member, the outer upper wall The trouble that the strength of the portion is reduced can be prevented, and the receiving groove can be easily processed.
[0012]
The ceiling inspection port according to the invention of claim 8 is the ceiling inspection port according to any one of claims 5, 6, or 7, wherein the receiving portion is formed with a lower end opening edge of the outer frame body. The center of the pivot shaft of the opening / closing arm when the inner frame is closed with respect to the outer frame. The distance from the lower edge opening edge of the outer frame body is L1, and the center-to-center distance between the connecting shaft of the opening / closing arm and the rotation shaft is L2, while the inner frame body is opened to the outer frame body. When the distance between the center of the connecting shaft that moves along the receiving portion and the opening edge of the lower end portion of the outer frame is L, the receiving portion can be secured so that a relationship of L ≧ L1 + L2 can be secured. The length of the part is set.
Therefore, when the inner frame body is opened with respect to the outer frame body, the connecting shaft of the opening / closing arm can be moved along the receiving portion without shortage, and the inner frame body is smoothly opened with respect to the outer frame body. be able to.
[0013]
The ceiling inspection port according to the invention of claim 9 is the ceiling inspection port according to any one of claims 5, 6, 7, or 8, wherein the outer upper wall portion of the outer frame body includes: A retaining member made of an elastic body is provided to prevent the connecting shaft of the opening / closing arm from coming out of the opening of the receiving portion, and the retaining member is pulled out of the connecting shaft of the opening / closing arm by its elastic deformation. The configuration is acceptable.
Therefore, it is possible to prevent the connecting shaft of the opening / closing arm from accidentally coming out of the opening of the receiving portion during the opening / closing operation of the inner frame with respect to the outer frame, and the inner frame is detached / dropped with respect to the outer frame. Can be prevented.
[0014]
A ceiling inspection port according to the invention of claim 10 is the ceiling inspection port according to any one of claims 1 to 9, and is opened and closed in a gap between the outer upper wall portion and the inner upper wall portion. The arm is disposed in a substantially horizontal state.
Therefore, the height dimensions of the outer upper wall portion and the inner upper wall portion can be reduced, respectively, and the ceiling inspection port can be reduced in size and weight accordingly.
[0015]
The ceiling inspection opening according to the invention of claim 11 is the ceiling inspection opening according to any one of claims 1 to 10, wherein the outer frame body is formed by outer frame members whose outer frame portions are vertical and horizontal. In addition, each of the vertical and horizontal outer frame members is formed into a rectangular frame by an outer frame corner tool, and the inner frame body is formed by the inner and lower inner frame members. These vertical and horizontal inner frame members are formed into a rectangular frame by an inner frame corner tool.
Therefore, the outer frame body is easily configured by vertically and horizontally framing each outer frame member being rectangularly framed by the outer frame corner tool.
Further, the inner frame body is easily configured by vertically and horizontally inner frame members being rectangularly framed by the inner frame corner tool.
[0016]
The ceiling inspection port according to the invention of claim 12 is the ceiling inspection port according to claim 11, wherein a fitting groove that opens outward is recessed in the outer side of the inner upper wall portion of the inner frame body. The inner frame corner tool has right-angled wing pieces, and these wing pieces are respectively inserted and fixed in the fitting grooves of the adjacent inner frame members to form the inner frame body. One end of the opening / closing arm in the longitudinal direction is attached to one wing piece of the inner frame corner tool so as to be rotatable by a rotation shaft.
Therefore, one end of the opening / closing arm is attached to one wing piece of the inner frame corner tool by the rotation shaft, and the connecting shaft at the other end of the opening / closing arm is used as a receiving portion of the outer frame body. Inserted and assembled. For this reason, the assembly | attachment property of a pair of opening-and-closing arm with respect to the inside of the clearance gap between the outer upper wall part of an outer frame body and the inner upper wall part of an inner frame body can be aimed at.
[0017]
A ceiling inspection port according to the invention of claim 13 is the ceiling inspection port according to claim 11, wherein a corner engaging piece is directed outward in the vicinity of the corner portion of the inner upper wall portion of the adjacent inner frame member. Are formed in a cut-and-raised shape, and the inner corner corner tool has blade pieces each having a right-angle shape and provided with slit-like engagement grooves corresponding to the respective corner engagement pieces. The inner frame body is framed by inserting and fixing the piece from above the corner engaging piece in the engagement groove, while the inner frame member of one of the adjacent inner frame members is On the outer side surface near the corner of the wall, a seat for projecting a longitudinal end of the opening / closing arm so as to be pivotable by a pivot shaft is provided.
Therefore, the inner frame body is rectangularly framed by inserting and fixing the wing pieces of the inner frame corner tool from above the corner engaging pieces of the inner upper wall portion of the adjacent inner frame material in the engaging grooves. This makes it easier to work on the inner frame.
In addition, one end portion in the longitudinal direction of the opening / closing arm can be rotatably attached to the seat portion projecting from the outer surface of the inner upper wall portion near the corner portion.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS.
In FIG. 7 showing the ceiling inspection port in a plane and in FIG. 3 showing the section based on the line III-III in FIG. 7, the ceiling inspection port 30 attached to the opening 2 opened in the ceiling board 1 is outside. A frame 31, an inner frame 51 that is attached to an opening of the outer frame 31 by an opening / closing arm 90 so as to be opened and closed, and an inner frame 51 that is disposed between the outer frame 31 and the inner frame 51. A lower stop member 110 and a locking member 120 are provided as closing means for closing the frame 51 in the closed state.
For convenience of explanation, the center side of the opening 2 of the ceiling board 1 will be described as the inside and the opposite side as the outside. As shown in FIG. 5, a field edge 3 is disposed in the vicinity of the opening 2 above (on the back side) of the ceiling plate 1, and a mounting receiver having a channel-like cross section is formed on the field edge 3. A member 4 is provided.
[0019]
As shown in FIGS. 1, 2, and 7, the outer frame body 31 is configured in a rectangular frame by vertical and horizontal outer frame members 32 that form the outer frame portion. Each of the vertical and horizontal outer frame members 32 is formed to have substantially the same cross-sectional shape by a light alloy extrusion die material such as an aluminum alloy, a bent material of a metal plate such as a stainless steel plate, or the like.
Each outer frame member 32 is slightly protruded inward from the upper end of the outer lower wall portion 33 that is substantially parallel to the inner peripheral surface of the opening 2 of the ceiling board 1 and the upper end of the outer lower wall portion 33. The upper step portion 34, the outer upper wall portion 35 provided vertically from the projecting end portion of the upper step portion 34, and the lower end of the outer lower wall portion 33 toward the lower surface of the ceiling plate 1 It is formed in a substantially W-shaped cross section with an extended engagement edge 38.
[0020]
In addition, a dovetail groove 37 having a dovetail shape is formed inwardly from the lower end inside the outer upper wall 35 of each outer frame member 32 to the upper end. Opening protrusions 39 are formed on the upper and lower opening edges of the fitting groove 37, respectively.
As shown in FIG. 2, both end surfaces in the longitudinal direction of each outer frame member 32 are cut at an angle of 45 degrees. And in the butt | corner corner part of the edge part of each outer frame material 32, while the outer frame corner tool 40 is inserted ranging over the mutual insertion groove | channel 37, the edge part of the adjacent outer frame material 32 is 90 degree | times. The outer frame body 31 held in a rectangular shape is configured by being abutted at an angle and coupled by the outer frame corner tool 40.
[0021]
That is, as shown in FIG. 8 and FIG. 9, the outer frame corner tool 40 has the wing pieces 41 inserted into the fitting grooves 37 at right angles at the corner portions of the adjacent outer frame members 32. In addition, a notch-shaped engaging portion 42 is formed on the upper and lower portions of each wing piece 41.
Then, at the four corner portions formed by the end portions of the outer frame members 32, the blade pieces 41 of the outer frame corner tool 40 are inserted into the fitting grooves 37 of the outer frame members 32. Thereafter, a portion 39a of the opening protrusion 39 of the fitting groove 37 of each outer frame member 32 is caulked toward the engaging portion 42 of each blade piece 41, whereby four corners formed by each outer frame member 32 are formed. The parts are respectively coupled by the outer frame corner tool 40, whereby the outer frame body 31 is formed into a rectangular frame.
[0022]
As shown in FIG. 5, the outer frame body 31 is fitted into the opening 2 from below the ceiling plate 1 and is attached to the attachment receiving member 4 by the support means 10.
Among the vertical and horizontal outer frame members 32 constituting the outer frame body 31, both outer frame members 32 facing each other (both outer frame members 32 positioned on the left and right sides in FIG. 3 in the first embodiment). As shown in FIG. 5, a required number of square hole-shaped mounting holes 35 a for the support means 10 are provided through the outer upper wall portion 35).
The support means 10 includes a number of suspension members 11 and support bolts 15 corresponding to the number of attachment holes 35a. The suspending member 11 has a substantially inverted L shape having a vertically extending suspending piece 12 and a support piece 14 bent at a right angle from the upper end of the suspending piece 12. And the latching claw 13 inserted and engaged with the attachment hole 35a of the outer upper wall part 35 is formed in the hanging piece 12 in the shape of an upwardly inclined shape.
A screw hole is provided in the support piece 14 of the suspension member 11, and a support bolt 15 is screwed into the screw hole so as to be able to advance and retract in the vertical direction.
[0023]
That is, the outer frame body 31 is fitted into the opening 2 of the ceiling plate 1, and the locking claw 13 of the suspension member 11 is inserted into the mounting hole 35 a of the outer upper wall portion 35 of the outer frame body 31 to engage with it. Is done. Further, a support bolt 15 is installed at the lower end of the mounting receiving member 4. In this state, the support bolt 15 is screwed, so that the engagement edge 38 of the outer frame body 31 is lifted to a position where it abuts on the lower surface of the ceiling plate 1. As a result, the outer frame body 31 is suspended and held by the support means 10 with respect to the opening 2 of the ceiling plate 1.
In order to stably support the suspension member 11, a part of the suspension piece 12 of the suspension member 11 is engaged with the opening protrusion 39 on the fitting groove 37 by forming a step. .
[0024]
As shown in FIGS. 3 and 7, an inner frame 51 is assembled to the frame opening of the outer frame 31 so as to be opened and closed and detachable by a pair of opening and closing arms 90 that are long in one direction. The bottom stop member 110 and the locking member 120 are held in a closed state.
As shown in FIGS. 1 and 2, the inner frame 51 is configured to be rectangularly framed by vertical and horizontal inner frame members 52 forming the inner frame portion. The vertical and horizontal inner frame members 52 are formed to have substantially the same cross-sectional shape by using a light alloy extrusion mold material such as an aluminum alloy or a metal plate bending material such as a stainless steel plate.
[0025]
Each of the inner frame members 52 includes an inner lower wall portion 53 that is substantially parallel to the inner side of the outer lower wall portion 33 of the outer frame body 31 with a predetermined gap, and an upper end of the inner lower wall portion 53 from the upper end of the inner lower wall portion 53. The middle stepped portion 54 that protrudes along the lower surface of the stepped portion 34 with a predetermined gap therebetween, and is substantially parallel to the inner side of the outer upper wall portion 35 with a predetermined gap and upward from the protruding end of the middle stepped portion 54 An inner upper wall portion 55 that is provided perpendicularly to the inner lower wall portion 53, and an overhang covering edge 58 that projects from the lower end of the inner lower wall portion 53 so as to cover the engaging edge 38 of the outer frame body 31. The cross section is formed in a substantially W shape.
A gap between the outer lower wall portion 33 of the outer frame body 31 and the inner lower wall portion 53 of the inner frame body 51 is closed by the overhanging covering edge 58 of the inner frame body 51.
[0026]
A fitting groove 57 having a dovetail shape is formed to open outward from the lower end portion on the outer side of the inner upper wall portion 55 of each inner frame member 52 to the upper end portion. Opening protrusions 59 are formed on the upper and lower opening edges of the fitting groove 57, respectively.
As shown in FIG. 2, both end surfaces of each inner frame member 52 are cut at an angle of 45 degrees, and the inner frame straddles the fitting grooves 57 at the butt corners of the end portions of these inner frame members 52. While the corner tool 70 is inserted, adjacent inner frame members 52 are abutted with each other at an angle of 90 degrees, and are joined by the inner frame corner tool 70, whereby the inner frame body 51 framed in a rectangular shape is formed. Composed.
[0027]
That is, as shown in FIGS. 10 and 11, the inner frame corner tool 70 is provided with wing pieces 71 at right angles, and a notch-like engaging portion 72 is provided at the upper and lower portions of each wing piece 71. Each is formed.
In each of the four corner portions formed by the end portions of the inner frame members 52, the blade pieces 71 of the inner frame corner tool 70 are inserted into the fitting grooves 57 of the inner frame members 52, respectively. The inner frame body 51 is configured in a rectangular shape by caulking a part 59 a of the opening protrusion edge 59 of the 57 toward the engaging portion 72.
In the first embodiment, of the four inner frame corner tools 70, two inner frame corner tools 70 positioned on the right side in FIG. One end portion in the longitudinal direction of the pair of opening / closing arms 90 is rotatably assembled by a rotation shaft 91. The pair of opening / closing arms 90 will be described in detail later.
[0028]
As shown in FIGS. 5 and 7, an inner lid plate 80 is fitted into the inner frame opening formed by the inner lower wall 53 of the inner frame 51 so as to close the opening. The plate 80 is supported by a required number of lid plate support members 81.
As shown in FIG. 5, the cover plate support member 81 is attached along the inner surface of the inner upper wall portion 55 of the inner frame body 51, and is projected inward from the lower end of the attachment portion 82. It is provided with a support portion 84 and is formed in a substantially L-shaped cross section. An inner lid plate 80 is fixed to the lower surface of the support portion 84 of the lid plate support member 81 by fastening means (not shown) such as screws, nails, and lid pressers.
Further, in the first embodiment, the cover plate support member 81 is moved in the vertical direction along the inner surface of the inner upper wall portion 55 of the inner frame 51 so as to correspond to various inner cover plates 80 having various thickness dimensions. It can be attached so that the movement can be adjusted.
[0029]
That is, as shown in FIGS. 5 and 6, the inner upper wall portion 55 of the inner frame body 51 is formed with a long hole 61 in the vertical direction, and a plurality of holes are formed inside the inner upper wall portion 55. A locking projection 88 is projected.
On the other hand, screw holes are formed at predetermined positions of the attachment portion 82 of the cover plate support member 81, and the upper and lower ends of the outer surface of the attachment portion 82 are provided with the inner upper wall portion 55 of the inner frame body 51. Engagement protrusions 83 that are selectively latched and engaged with the plurality of locking protrusions 88 are respectively provided.
Then, among the plurality of locking projections 88 of the inner upper wall portion 55 of the inner frame body 51, the engagement projections 83 of the cover plate support member 81 are hooked and engaged with the desired locking projections 88. Under this state, the screws 85 are screwed into the screw holes of the cover plate support member 81 from the outside of the inner upper wall portion 55 of the inner frame body 51 through the long holes 61, thereby the inner upper wall portion of the inner frame body 51. A lid plate support member 81 is attached to a height position corresponding to a desired inner lid plate 80 with respect to the inner side of 55.
[0030]
As shown in FIG. 3, the lower member 110 and the locking member 120 that form a closing means for holding the inner frame 51 in the closed state with respect to the outer frame body 31 include inner and lower inner frames of the inner frame body 51. One of the materials 52 is mounted on each of the opposing inner frame materials 52.
In the first embodiment, the lower stopper member 110 is disposed on the outer upper portion of the inner upper wall portion 55 of the inner frame member 52 of one of the inner and lower inner frame members 52 (right side as viewed in FIG. 3). Is attached. The lower stopper member 110 includes a substrate portion 111 attached to the outside of the inner upper wall portion 55 of the inner frame member 52 by screws 112, and slightly exceeds the upper edge of the inner upper wall portion 55 from the upper end of the substrate portion 111. The engaging piece 113 extending in a substantially horizontal shape and the sliding piece 114 extending in an upwardly inclined manner from the tip of the engaging piece 113 are integrally provided.
[0031]
Further, the inner frame member 52 facing the inner frame member 52 to which the lower stopper member 110 is attached (located on the left side in FIG. 3) has a locking member 120 on the inner side of the inner upper wall portion 55. It is assembled so that it can be rotated.
As shown in FIGS. 3 and 7, the locking member 120 includes a shaft body 121 in the vertical direction and a locking plate 130 integrally. And the locking member 120 is rotatably fitted and assembled to the bearing portion of the lock bracket 125 having a plane cross section of substantially Ω shape in the shaft body 121.
[0032]
The locking plate 130 of the locking member 120 is positioned above the bearing portion of the lock bracket 125 and is fixed substantially horizontally by a caulking portion 122 to the upper end of the shaft body 121. The distal end portion of the locking plate 130 extends through a through hole 144 that extends through the inner upper wall portion 55 to a position where it can be removably inserted into a closing hole 145 that extends through the outer upper wall portion 35 of the outer frame 31. Has been issued. The locking plate 130 is rotated integrally with the shaft body 121, so that the locking plate 130 is inserted into and engaged with the closing hole 145 of the outer upper wall portion 35, and approximately 90 from the locking position. The position is switched to the unlocking position that is rotated by the angle and is released from the closing hole 145 of the outer upper wall portion 35.
The lower end portion of the shaft 121 of the locking member 120 penetrates the inner lid plate 80 and slightly protrudes from the lower surface of the inner lid plate 80. A rotating groove 123 into which a coin or the like for rotating the locking plate 130 together with the shaft body 121 is inserted is recessed in the lower end surface of the shaft body 121.
A closing cap 140 that closes the lower end opening of the through hole of the inner lid plate 80 is attached to the outer periphery of the lower end portion of the shaft body 121.
[0033]
In the outer frame body 31 and the inner frame body 51 configured as described above, as shown in FIG. 4, the upper stepped portion 34 projecting inward from the outer lower wall portion 33 of the outer frame body 31. The projecting dimension of the middle step part 54 projecting inward from the inner lower wall part 53 of the inner frame 51 is set to be appropriately larger than the projecting dimension. As a result, the pair of opening and closing arms 90 that are long in one direction in the gap formed between the outer upper wall portion 35 of the outer frame body 31 and the inner upper wall portion 55 of the inner frame body 51 are substantially horizontal. Are arranged.
In the first embodiment, as shown in FIGS. 1, 2, and 7, of the four inner frame corner tools 70 of the inner frame 51, both inner frames positioned on the right side in FIG. 7. In each wing piece 71 of the corner tool 70, one end portion in the longitudinal direction of the pair of opening and closing arms 90 is rotatably assembled by a rotation shaft 91 (see FIG. 10).
Further, a connecting shaft that is removably inserted into a receiving portion having an opening provided inside the outer upper wall portion 35 of the outer frame body 31 at the other end portion in the longitudinal direction of the pair of opening and closing arms 90. 100 is assembled.
[0034]
That is, as shown in FIGS. 1 and 2, the rotation shaft 91 provided at one end portion in the longitudinal direction of the pair of opening and closing arms 90 includes a head portion 92 and a stepped shaft portion 93.
On the other hand, one wing piece 71 of the inner frame corner tool 70 is formed with a shaft seat portion protruding outward. A shaft hole into which the large-diameter shaft portion of the stepped shaft portion 93 of the rotation shaft 91 is inserted is provided in the center portion of the seat portion.
On the other hand, a seat portion that is recessed outside and protrudes inward is formed near the one end portion of the opening / closing arm 90, and the stepped shaft portion 93 of the rotation shaft 91 is formed at the center portion of the seat portion. A shaft hole into which the small-diameter shaft portion is inserted is provided. The large-diameter shaft portion of the stepped shaft portion 93 of the rotation shaft 91 is fitted into the shaft hole from the inside of the seat portion of one wing piece 71 of the inner frame corner tool 70, and the stepped shaft portion In a state where the small diameter shaft portion 93 is inserted into the shaft hole of the seat portion of the opening / closing arm 90, a caulking portion 96 is provided by caulking at the distal end portion of the small diameter shaft portion. The opening / closing arm 90 is assembled in a state where the seat portion of one blade piece 71 and the seat portion of the opening / closing arm 90 are in contact with each other. As a result, most of the opening / closing arm 90 is kept from coming into contact with the outer surface of the inner upper wall 55 of the inner frame member 52 so that the opening / closing arm 90 can be rotated smoothly and lightly. It has become.
[0035]
As shown in FIGS. 1 and 2, the connecting shaft 100 provided near the other end portion in the longitudinal direction of the pair of opening and closing arms 90 includes a head portion 101 and a stepped shaft portion 102. Yes. The small-diameter shaft portion of the stepped shaft portion 102 of the connecting shaft 100 is inserted into a shaft hole penetrating the other end portion of the opening / closing arm 90, and the tip of the small-diameter shaft portion of the stepped shaft portion 102 is inserted. The connecting shaft 100 is attached to the opening / closing arm 90 by providing the caulking portion 103 to the portion by caulking.
On the other hand, on the inner side of the outer upper wall portion 35 of the outer frame body 31, a receiving portion having an opening through which the connecting shaft 100 is removably inserted into the opening / closing arm 90 on the side away from the corner portion of the inner frame body 51. A stop is provided.
[0036]
In the first embodiment, as shown in FIG. 1 and FIG. 2, at a predetermined position inside the outer upper wall portion 35 of the outer frame body 31, it is received between the upper and lower opening protruding edges 39 of the fitting groove 37. A stop member 150 is attached. The receiving member 150 includes a base 151 fixed by screws 160 along the inner side surface of the outer upper wall portion 35, and is bent at a right angle from the base portion 151 toward the inner side. The outer upper wall extends from the tip of the bent portion. A flat section substantially extending along the inner surface of the portion 35 and extending between the inner surface of the upper outer wall portion 35 and a gap through which the head 101 of the connecting shaft 100 can be inserted. It is Z-shaped.
The extending portion 152 of the receiving member 150 is formed with a notch-shaped receiving groove 155 that constitutes a receiving portion into which the connecting shaft 100 of the opening and closing arm 90 is removably inserted.
On one end side of the receiving groove 155 (the side away from the corner portion of the inner frame 51), an opening portion through which the connecting shaft 100 of the opening / closing arm 90 is inserted and removed is formed.
[0037]
As shown in FIGS. 1 and 2, the receiving groove 155 of the receiving member 150 is substantially a line connecting the lower end opening edge of the outer frame 31 and the center of the connecting shaft 100 of the opening and closing arm 90. It is provided in an inclined shape on the extension line.
Further, as shown by a two-dot chain line in FIG. 14, in the state where the inner frame 51 is closed with respect to the outer frame body 31, the center of the rotation shaft 91 of the opening and closing arm 90 and the lower end opening of the outer frame body 31 are opened. The distance from the edge is L1, the center-to-center distance between the connecting shaft 100 of the opening / closing arm 90 and the rotation shaft 91 is L2, and when the inner frame 51 is opened with respect to the outer frame 31, the receiving groove 155 The groove length of the receiving groove 155 so that the relationship of “L ≧ L1 + L2” can be secured, where L is the distance from the center of the connecting shaft 100 moving along the lower end opening edge of the outer frame body 31 to L. Is set appropriately.
[0038]
Further, as shown by a two-dot chain line in FIG. 14, the opening / closing arm 90 and the connecting shaft 100 are rotated so that the inner frame 51 can be opened by the opening / closing arm 90 in a substantially suspended state with respect to the outer frame 31. The distance from the center to the moving shaft 91 is L2, the distance from the center of the pivot shaft 91 of the opening / closing arm 90 to the tip of the overhanging edge 58 of the inner frame 51 is A, and the connecting shaft of the opening / closing arm 90 When the distance from the center of 100 to the engagement edge 38 of the outer lower wall portion 33 of the outer frame 31 is B, the arm length of the opening / closing arm 90 is ensured so that the relationship “L2 ≧ A + B” can be secured. Is set appropriately.
[0039]
Further, the outer upper wall portion 35 of the outer frame body 31 is configured to prevent the connecting shaft 100 of the opening / closing arm 90 from coming off at the head portion 101 from the opening portion of the receiving groove 155 of the receiving member 150. A retaining member 170 made of an elastic body is provided.
In the first embodiment, as shown in FIGS. 1 and 2, the retaining member 170 is made of a leaf spring material and is elastically bent at one end portion of the outer upper wall portion 35 of the outer frame body 31. The outer surface is fastened together with a screw 160 that fastens the receiving member 150 in a cantilever manner.
The free end portion of the retaining member 170 is passed through a hole penetrating the outer upper wall portion 35 of the outer frame 31 and the opening of the receiving groove 155 of the receiving member 150 is closed. A retaining portion 171 is formed in a semicircular cross section projecting inside the portion 35.
The connecting shaft 100 of the opening / closing arm 90 is brought into contact with and engaged with the retaining portion 171 of the retaining member 170 at the head 101, thereby preventing the connecting shaft 100 from being accidentally pulled out.
Further, when the connecting shaft 100 of the opening / closing arm 90 is pushed out against the engaging force of the retaining portion 171 of the retaining member 170, the retaining member 170 is opened so as to open the opening of the receiving groove 155. Is elastically bent, thereby allowing the connecting shaft 100 to be pulled out.
[0040]
In the first embodiment, as shown in FIG. 1, the upper step part 34 of the outer frame 31 and the middle step part 54 of the inner frame 51 are formed on the upper surface of the middle step part 54 of the inner frame 51. An airtight seal member 180 that closes the gap between the two is attached.
Further, on the upper surface of the overhang covering edge 58 of the inner frame body 51, an airtight seal member that closes a gap between the engaging edge 38 of the outer frame body 31 and the overhang covering edge 58 of the inner frame body 51. 181 is provided.
Further, each of the seal members 180 and 181 is formed from a gas-tight synthetic resin such as polyethylene foam or urethane foam, rubber, or the like.
[0041]
The ceiling inspection port 30 of the first embodiment is configured as described above. Therefore, when opening the inner frame 51 held in a closed state with respect to the outer frame 31, first, as shown in FIG. 12, the locking member 120 in the locking position is operated to be rotated by approximately 90 degrees in a predetermined direction. The arrangement is switched to the unlocking position. In this state, the inner frame 51 with respect to the outer frame 31 is slightly in the direction (the left side in FIG. 12) in which the engagement piece 113 of the lower stopper member 110 is disengaged from the upper edge of the outer frame 31. Moved.
Thereafter, as shown in FIG. 13, the inner frame 51 rotates downward (counterclockwise in the direction of FIG. 13) with the rotation shaft 91 of the opening / closing arm 90 as a fulcrum based on its own weight. The sliding piece 114 of the lower stop member 110 contacts the upper edge of the outer frame body 31 and slides obliquely downward. At this time, the opening / closing arm 90 rotates downward (clockwise in FIG. 13) with the connecting shaft 100 as a fulcrum while the connecting shaft 100 slightly moves along the receiving groove 155.
[0042]
Subsequently, as shown in FIG. 14, after the sliding piece 114 of the lower stop member 110 passes through the upper edge of the outer upper wall portion 35 of the outer frame body 31, as shown by a two-dot chain line in FIG. 14, Based on its own weight, the body 51 rotates about the rotation shaft 91 of the opening / closing arm 90 as a fulcrum, and the opening / closing arm 90 rotates to a position substantially hanging down with the connecting shaft 100 as a fulcrum. As a result, the inner frame 51 is opened in a substantially hanging manner with respect to the outer frame 31.
Further, the inner frame 51 is closed with respect to the outer frame 31 by operating in the reverse procedure.
[0043]
In the outer frame body 31 and the inner frame body 51, the inner lower wall portion 53 of the inner frame body 51 with respect to the projecting dimension of the upper stepped portion 34 projecting inward from the outer lower wall portion 33 of the outer frame body 31. The projecting dimension of the middle step portion 54 projecting inward from the inner side is appropriately set large. Thus, the gap between the outer lower wall portion 33 of the outer frame body 31 and the inner lower wall portion 53 of the inner frame body 51 is set as small as possible, while the outer upper wall portion 35 of the outer frame body 31 is A gap for arranging the pair of opening and closing arms 90 can be easily secured between the inner upper wall portion 55 of the inner frame body 51 (see FIG. 4).
Further, the horizontal play of the inner frame body 51 with respect to the outer frame body 31 can be reduced by the amount that the gap between the outer lower wall section 33 and the inner lower wall section 53 is reduced.
[0044]
Further, the outer frame body 31 has an outer frame member 32 having vertical and horizontal outer frame members 32 each including an outer lower wall portion 33, an upper step portion 34, an outer upper wall portion 35, and an engagement edge 38. It is shaped like a letter, difficult to deform and strong. Also in the inner frame body 51, each of the vertical and horizontal inner frame members 52 forming the inner frame portion includes an inner lower wall portion 53, a middle step portion 54, an inner upper wall portion 55, and an overhang covering edge 58. It is almost W-shaped, difficult to deform and strong. In this way, the strength of the outer frame body 31 and the inner frame body 51 can be increased to improve durability.
[0045]
Further, in the first embodiment, as shown in FIG. 10, one end portion of the opening / closing arm 90 is rotatably attached to one wing piece 71 of the inner frame corner tool 70 by the rotation shaft 91. Then, the connecting shaft 100 at the other end of the opening / closing arm 90 is inserted into the receiving groove 155 of the outer frame 31 and assembled. Therefore, it is possible to improve the assembling property of the pair of opening / closing arms 90 in the gap between the outer upper wall portion 35 of the outer frame body 31 and the inner upper wall portion 55 of the inner frame body 51.
Further, a receiving groove 155 as a receiving portion for the connecting shaft 100 of the opening / closing arm 90 is formed in the receiving member 150, and the receiving member 150 is attached inside the outer upper wall portion 35 of the outer frame body 31. It is configured. For this reason, unlike the case where the receiving groove 155 is directly formed in the outer upper wall portion 35, it is possible to prevent a problem that the strength of the outer upper wall portion 35 is reduced, and the processing of the receiving groove 155 is easy. It becomes.
[0046]
When the inner frame 51 is opened and closed with respect to the outer frame body 31, the opening of the receiving groove 155 of the receiving member 150 of the outer frame body 31 is elastically closed by the retaining member 170. . Therefore, it is possible to prevent the connecting shaft 100 of the opening / closing arm 90 from unexpectedly coming out of the opening of the receiving groove 155 during the opening / closing operation of the inner frame 51 with respect to the outer frame 31. For this reason, it is possible to prevent the inner frame body 51 from being separated from or dropped from the outer frame body 31 due to the unexpected disconnection of the connecting shaft 100 of the opening / closing arm 90 from the receiving groove 155.
[0047]
Further, the connecting shaft 100 of the opening / closing arm 90 can be detached from the opening of the receiving groove 155 while elastically deforming the retaining member 170. For this reason, the detaching operation of the inner frame 51 with respect to the outer frame 31 is easily performed. Furthermore, by removing the inner frame body 51 from the outer frame body 31, maintenance and inspection of the wiring and piping inside the ceiling plate 1 can be easily performed.
Further, when the inner frame 51 is closed with respect to the outer frame 31, the overhanging edge 58 of the inner frame 51 covers and hides the engagement edge 38 of the outer frame 31. The design is improved.
[0048]
In the first embodiment, as shown in FIG. 1, the upper step part 34 of the outer frame 31 and the middle step part 54 of the inner frame 51 are formed on the upper surface of the middle step part 54 of the inner frame 51. An airtight seal member 180 that closes the gap between the two is attached. Further, on the upper surface of the overhang covering edge 58 of the inner frame body 51, an airtight seal member that closes a gap between the engaging edge 38 of the outer frame body 31 and the overhang covering edge 58 of the inner frame body 51. 181 is provided.
For this reason, the outer frame body 31 and the inner frame body 51 can be sealed twice by the sealing members 180 and 181 to keep the airtightness.
[0049]
In the first embodiment, when the inner frame 51 is closed with respect to the outer frame 31, the distance between the center of the pivot shaft 91 of the opening / closing arm 90 and the lower end opening edge of the outer frame 31. Is L1, the center-to-center distance between the connecting shaft 100 of the opening and closing arm 90 and the rotation shaft 91 is L2, and moves along the receiving groove 155 when the inner frame 51 is opened with respect to the outer frame 31. The groove length of the receiving groove 155 is appropriately set so that the relationship of “L ≧ L1 + L2” can be secured when the distance from the center of the connecting shaft 100 to the opening edge of the lower end portion of the outer frame body 31 is L. Has been. For this reason, when the inner frame 51 is opened with respect to the outer frame 31, the connecting shaft 100 of the opening / closing arm 90 can be moved along the receiving groove 155 without any shortage. The frame 51 is smoothly opened (see FIG. 14).
[0050]
In the first embodiment, the center-to-center distance between the connecting shaft 100 of the opening / closing arm 90 and the rotation shaft 91 is L2, and the inner frame 51 is projected from the center of the rotation shaft 91 of the opening / closing arm 90. When the distance from the center of the connecting shaft 100 of the opening / closing arm 90 to the engagement edge 38 of the outer lower wall portion 33 of the outer frame 31 is B, the distance to the tip of the covering edge 58 is “L2”. The arm length of the opening / closing arm 90 is appropriately set so that the relationship of “≧ A + B” can be ensured. For this reason, as shown by a two-dot chain line in FIG. 14, the inner frame body 51 can be satisfactorily opened to the outer frame body 31 through the opening / closing arm 90 to an open state in which it substantially hangs down.
[0051]
The present invention is not limited to the first embodiment. For example, you may change like each Embodiment 2-8 shown in FIGS.
(Embodiment 2)
In the second embodiment shown in FIGS. 15 and 16, the opening width of the fitting groove 37 with respect to the outer frame corner tool 40 formed inside the outer upper wall portion 35 of the outer frame body 31 is appropriately reduced. A part of the fitting groove 37 is configured to function as a receiving groove 155 for the connecting shaft 100 of the opening / closing arm 90.
Further, a stopper portion 186 is provided at a predetermined position of the fitting groove 37, in other words, at one end portion of the receiving groove 155 so as to contact the head portion 101 of the connecting shaft 100 and prevent further movement of the connecting shaft 100. ing. The stopper portion 186 can be easily provided by projecting a part of the outer upper wall portion 35 of the outer frame body 31 toward the inside (the fitting groove 37 side) by caulking or the like.
Further, at a predetermined position of the fitting groove 37, in other words, at the other end portion side of the receiving groove 155, a part of the upper opening protruding edge 39 among the upper and lower opening protruding edges 39 of the fitting groove 37 is arranged. An opening 185 into which the connecting shaft 100 can be inserted and removed is formed by cutting. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0052]
(Embodiment 3)
Further, in the third embodiment shown in FIGS. 17 to 19, the other end of the opening / closing arm 90 attached to one wing piece 71 of the inner frame corner tool 70 of the inner frame 51 by the rotation shaft 91. The vicinity is bent upward and the connecting shaft 100 is attached to the tip.
On the other hand, the receiving member 150 attached to the inner side of the outer upper wall portion 35 of the outer frame 31 has a receiving groove 155 having an opening at the upper end for receiving the connecting shaft 100 of the opening / closing arm 90 so as to be detachable. It is formed in a substantially L shape. However, in this case, when the connecting shaft 100 of the opening / closing arm 90 is inserted into and removed from the upper end opening of the receiving groove 155, the opening protrusion 39 on the upper side of the fitting groove 37 of the outer upper wall 35 does not become an obstruction. Thus, a part of the upper opening protrusion 39 is cut away 187. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0053]
(Embodiment 4)
In Embodiment 4 shown in FIGS. 20 and 21, a fitting groove 37 for the outer frame corner tool 40 is formed on the outer surface of the outer upper wall portion 35 of the outer frame body 31. Since other configurations are configured in the same manner as in the third embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0054]
(Embodiment 5)
In the fifth embodiment shown in FIGS. 22 and 23, the connecting shaft 100 of the opening / closing arm 90 is inserted into and removed from the receiving member 150 attached to the inside of the outer upper wall portion 35 of the outer frame 31. The receiving groove 155 that can be received is formed to be inclined upward in the direction approaching the inner frame corner tool 70 in the direction opposite to that of the first embodiment, and the tip of the receiving groove 155 is the upper end of the receiving member 150. It is an opening. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0055]
(Embodiment 6)
Further, in the sixth embodiment shown in FIG. 24, a fitting groove 57a corresponding to the second inner frame corner tool 70a is formed on the outer surface of the inner lower wall portion 53 of the inner frame 51, and the inner frame The body 51 is a solid framework. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0056]
(Embodiment 7)
In the seventh embodiment shown in FIG. 25, a fitting groove 57b corresponding to the second inner frame corner tool 70b is formed on the inner surface of the inner lower wall portion 53 of the inner frame body 51, and the inner frame The body 51 is a solid framework. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0057]
(Embodiment 8)
Further, in the eighth embodiment shown in FIG. 26, the mounting member 6 having a U-shaped cross section is disposed at a predetermined height position on the back side of the ceiling board 1, while the outer upper wall portion 35 of the outer frame body 31 is disposed. The lower end of the suspension member 11 that is long in the vertical direction is fixed by a screw 18. Then, the outer frame body 31 is attached to the upper piece 6a of the attachment member 6 by tightening the fastening member 24 on the upper part of the suspension member 11 with bolts 28 and nuts 29 so that the position can be adjusted in the vertical direction. Since other configurations are configured in the same manner as in the first or second embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0058]
(Embodiment 9)
In the ninth embodiment shown in FIG. 27 to FIG. 29, in the vicinity of the corner portion of the inner upper wall portion 55 of the adjacent inner frame member 52 among the vertical and horizontal inner frame members 52 constituting the inner frame body 51. Each of the planar engaging portions 55a having a substantially L shape is cut and raised toward the outside.
On the other hand, a slit-like engagement groove 71a corresponding to each corner engagement piece 55a is formed at a predetermined position of each wing piece 71 forming a right angle of the inner frame corner tool 70 from the lower end toward the upper end. Each is notched. And in the state which inserted each blade piece 71 of the inner frame corner tool 70 from the upper direction of each corner engaging piece 55a of the inner upper wall part 55 of the adjacent inner frame material 52 in the engaging groove 71a, The corner engaging piece 55a is fixed by caulking the tip of the corner engaging piece 55a toward each wing piece 71 of the inner frame corner tool 70, and the inner frame 51 is formed into a rectangular frame.
In addition, an insertion groove 57a corresponding to the second inner frame corner tool 70a is formed on the outer surface of the inner lower wall portion 53 of the inner frame body 51, so that the inner frame body 51 is firmly structured. Yes.
Also, among the vertical and horizontal inner frame members 52 constituting the inner frame body 51, a seat portion 55b is projected from the outer surface near the corner portion of the inner upper wall portion 55 of the inner frame member 52 that is opposed to the inner frame member 52. One end portion in the longitudinal direction of the opening / closing arm 90 is attached to the portion 55b so as to be rotatable by a rotation shaft 91. Since other configurations are configured in the same manner as in the first or second embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0059]
(Embodiment 10)
Further, in the tenth embodiment shown in FIG. 30, the locking member 120 is provided outside the inner upper wall portion 55 of the required inner frame member 52 among the vertical and horizontal inner frame members 52 constituting the inner frame body 51. The lock bracket 125 is assembled so that it can be rotated.
The locking plate 130 of the locking member 120 is positioned above the bearing portion of the lock bracket 125 and detachably engages with the upper edge of the outer upper wall portion 35 of the outer frame body 31, so that the outer frame body 31 is engaged. The inner frame 51 is locked.
The lower end portion of the shaft body 121 of the locking member 120 penetrates the middle step portion 54 and the inner lid plate 80 of the inner frame body 51 and slightly protrudes from the lower surface of the inner lid plate 80. A rotating groove 123 into which a coin or the like for rotating the locking plate 130 together with the shaft body 121 is inserted is recessed in the lower end surface of the shaft body 121. Since other configurations are configured in the same manner as in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
[0060]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the inner frame body from rattling in the horizontal direction with respect to the outer frame body, and the opening / closing arm is disposed between the outer frame body and the inner frame body. Therefore, it is possible to easily secure a space. In addition, it is possible to improve the durability by increasing the strength of each frame portion of the outer frame body and the inner frame body.
[Brief description of the drawings]
1 is a cross-sectional view based on the line II in FIG. 7, showing the relationship between the outer frame body, inner frame body and opening / closing arm of a ceiling inspection port according to Embodiment 1 of the present invention;
2 is a cross-sectional view taken along the line II-II in FIG. 1, showing the relationship between the outer frame, the inner frame, and the open / close arm.
3 is a cross-sectional view based on the line III-III in FIG. 7 showing the relationship among the outer frame body, the inner frame body, the lower stopper member, and the locking member.
4 is a cross-sectional view based on the line IV-IV in FIG. 7 showing the relationship between the outer frame body, the inner frame body, and the open / close arm.
5 is a cross-sectional view taken along the line VV in FIG. 7 showing a suspension means for the outer frame body and a cover plate support member for the inner frame body.
FIG. 6 is a cross-sectional view showing an embodiment in which different inner lid plates are similarly attached to the inner frame body depending on the lid plate support member.
FIG. 7 is a plan view showing the entire ceiling inspection port in a simplified manner.
FIG. 8 is a perspective view showing the outer frame corner tool.
FIG. 9 is an explanatory view showing a corner portion of an outer frame body in which the vertical and horizontal outer frame members are similarly framed by an outer frame corner tool.
FIG. 10 is a perspective view showing the inner frame corner tool.
FIG. 11 is an explanatory view showing a corner portion of the inner frame body in which the inner and lower inner frame members are similarly framed by an inner frame corner tool.
FIG. 12 is a cross-sectional view showing a state in which the locking member is unlocked prior to opening the inner frame with respect to the outer frame.
FIG. 13 is an explanatory view showing a state where the inner frame body is opened to a predetermined opening while sliding the lower stopper member along the upper edge of the outer upper wall portion of the outer frame body.
FIG. 14 is a cross-sectional view showing an opened state of the inner frame after the lower stopper member passes through the outer upper wall portion of the outer frame.
FIG. 15 is a cross-sectional view showing a relationship among an outer frame body, an inner frame body, and an opening / closing arm according to a second embodiment of the present invention.
16 is a cross-sectional view based on the XVI-XVI line of FIG.
FIG. 17 is a cross-sectional view showing a relationship among an outer frame body, an inner frame body, and an opening / closing arm according to a third embodiment of the present invention.
18 is a sectional view based on the XVIII-XVIII line of FIG.
19 is a sectional view based on the XIX-XIX line of FIG.
FIG. 20 is a cross-sectional view showing a relationship among an outer frame body, an inner frame body, and an opening / closing arm according to a fourth embodiment of the present invention.
FIG. 21 is a cross-sectional view based on the XXI-XXI line of FIG.
FIG. 22 is a cross-sectional view showing a relationship among an outer frame body, an inner frame body, and an opening / closing arm according to a fifth embodiment of the present invention.
23 is a sectional view based on the line XXIII-XXIII in FIG.
FIG. 24 is a cross sectional view showing Embodiment 6 of the present invention.
FIG. 25 is a sectional view showing Embodiment 7 of the present invention.
FIG. 26 is a sectional view showing Embodiment 8 of the present invention.
FIG. 27 is a perspective view showing a corner portion of an inner frame body according to a ninth embodiment of the present invention.
FIG. 28 is a partial cross-sectional view showing the inner frame body as viewed from the side by similarly breaking the outer frame body.
29 is a sectional view based on the XXIX-XXIX line of FIG. 28. FIG.
FIG. 30 is a sectional view showing Embodiment 10 of the present invention.
[Explanation of symbols]
1 Ceiling board
2 opening
30 Ceiling inspection port
31 Outer frame
32 Outer frame material (outer frame part)
33 Exterior lower wall
34 Upper step
35 Outer upper wall
37 Insertion groove
38 engagement edge
40 Outer frame corner tool
41 Wings
51 inner frame
52 Inner frame material (inner frame)
53 Inner lower wall
54 Middle step
55 Inner upper wall
57 Insertion groove
58 Overhang covering edge
70 Inner frame corner tool
71 Wings
90 Opening and closing arm
91 Rotating shaft
100 connecting shaft
110 Bottom stop member (closing means)
120 Locking member (closing means)

Claims (13)

天井板の開口部に装着される外枠体と、
前記外枠体の開口部に対し一方向に長い一対の開閉用アームによって開閉可能に組み付けられる内枠体と、
前記外枠体と前記内枠体との間に跨って係脱可能に配設され同内枠体を閉じ状態に閉止する閉止手段と、を備えた天井点検口であって、
前記外枠体は、その外枠部の断面において、前記天井板の開口部の内周面に沿う外下壁部と、その外下壁部から内側に向けて張り出された上段差部と、その段差部から上方に向けて設けられた外上壁部とを有する一方、
前記内枠体は、その内枠部の断面において、前記外下壁部の内周面に沿う内下壁部と、その内下壁部から前記上段差部の下面に沿って張り出された中段差部と、前記外上壁部の内周面に沿いかつ前記中段差部から上方に向けて設けられた内上壁部とを有し、
前記外下壁部から張り出された上段差部の張り出し寸法に対し、前記内下壁部から張り出された中段差部の張り出し寸法が大きく設定され、これによって前記外上壁部と前記内上壁部との間に構成された隙間内おいて前記開閉用アームが配設されている天井点検口。An outer frame attached to the opening of the ceiling plate;
An inner frame that can be opened and closed by a pair of opening and closing arms that are long in one direction with respect to the opening of the outer frame;
A ceiling inspection port provided with a closing means that is detachably disposed between the outer frame body and the inner frame body and closes the inner frame body in a closed state,
The outer frame body includes, in a cross section of the outer frame portion, an outer lower wall portion along an inner peripheral surface of the opening of the ceiling plate, and an upper step portion projecting inward from the outer lower wall portion. While having an outer upper wall portion provided upward from the stepped portion,
In the cross section of the inner frame portion, the inner frame body extends along the inner lower wall portion along the inner peripheral surface of the outer lower wall portion, and along the lower surface of the upper step portion from the inner lower wall portion. A middle step portion, and an inner upper wall portion provided along the inner peripheral surface of the outer upper wall portion and facing upward from the middle step portion,
The projecting dimension of the middle stepped part projecting from the inner lower wall part is set larger than the projecting dimension of the upper stepped part projecting from the outer lower wall part. A ceiling inspection port in which the opening / closing arm is disposed in a gap formed between the upper wall portion and the upper wall portion. 請求項１に記載の天井点検口であって、
外枠体の上段差部と内枠体の中段差部との間には気密性を有するシール部材が設けられている天井点検口。The ceiling inspection port according to claim 1,
A ceiling inspection port in which an airtight seal member is provided between an upper step portion of the outer frame body and a middle step portion of the inner frame body. 請求項１又は２に記載の天井点検口であって、
外枠体には、その外下壁部の下端部において天井板の開口部の下端縁に向けて張り出す係合縁が形成される一方、
内枠体には、その内下壁部の下端部において、前記係合縁を覆う張出覆い縁が形成されている天井点検口。The ceiling inspection port according to claim 1 or 2,
While the outer frame body is formed with an engagement edge that protrudes toward the lower end edge of the opening of the ceiling plate at the lower end portion of the outer lower wall portion,
A ceiling inspection port in which an overhang covering edge that covers the engagement edge is formed at the lower end portion of the inner lower wall portion of the inner frame body. 請求項３に記載の天井点検口であって、
外枠体の係合縁と、内枠体の張出覆い縁との間には気密性を有するシール部材が設けられている天井点検口。The ceiling inspection port according to claim 3,
A ceiling inspection port in which an airtight seal member is provided between an engagement edge of the outer frame body and an overhanging edge of the inner frame body. 請求項１〜４のいずれか一項に記載の天井点検口であって、
開閉用アームの長手方向の一端部は、内枠体のコーナ部に接近する側において、同内枠体の内上壁部側に回動軸を中心として回動可能に装着され、
前記開閉用アームの他端部には、前記内枠体のコーナ部から離反する側において、外枠体の外上壁部側に配設された開口部を有する受止め部に挿脱可能に差し込まれる連結軸が組み付けられている天井点検口。The ceiling inspection port according to any one of claims 1 to 4,
One end portion of the opening / closing arm in the longitudinal direction is attached to the inner upper wall portion side of the inner frame body so as to be rotatable about the rotation axis on the side approaching the corner portion of the inner frame body,
The other end of the opening / closing arm can be inserted into and removed from a receiving portion having an opening disposed on the outer upper wall side of the outer frame on the side away from the corner of the inner frame. Ceiling inspection port with a connecting shaft to be inserted. 請求項５に記載の天井点検口であって、
外枠体の外上壁部に対し、開閉用アームの連結軸が挿脱可能に差し込まれる開口部を有する受止め部が形成されている天井点検口。The ceiling inspection port according to claim 5,
A ceiling inspection port in which a receiving portion having an opening into which a connecting shaft of an opening / closing arm is detachably inserted is formed on the outer upper wall portion of the outer frame body. 請求項５に記載の天井点検口であって、
外枠体の外上壁部の内側には受止め部材が装着され、その受止め部材には、開閉用アームの連結軸が挿脱可能に差し込まれる開口部を有する受止め部を構成する切り欠き状の受止め溝が形成されている天井点検口。The ceiling inspection port according to claim 5,
A receiving member is mounted on the inner side of the outer upper wall portion of the outer frame body, and the receiving member has a cut-off portion constituting an opening portion into which the connecting shaft of the opening / closing arm is removably inserted. Ceiling inspection opening with a notch-shaped receiving groove. 請求項５、又は６、又は７のいずれか一項に記載の天井点検口であって、
受止め部は、外枠体の下端部開口縁と、開閉用アームの連結軸の中心とを結ぶ線のほぼ延長線上に設けられ、
前記外枠体に対し内枠体が閉止された状態にあるとき、前記開閉用アームの回動軸の中心と前記外枠体の下端部開口縁との距離をＬ１とし、前記開閉用アームの連結軸と回動軸との中心間距離をＬ２とする一方、
前記外枠体に対し内枠体を開放する際に前記受止め部に沿って移動する前記連結軸の中心と前記外枠体の下端部開口縁までの距離をＬとしたときに、
Ｌ≧Ｌ１＋Ｌ２の関係が確保できるように、前記受止め部の長さが設定されている天井点検口。The ceiling inspection port according to any one of claims 5, 6, and 7,
The receiving part is provided substantially on an extension line of a line connecting the lower end opening edge of the outer frame body and the center of the connecting shaft of the opening and closing arm,
When the inner frame is in a closed state with respect to the outer frame, the distance between the center of the pivot shaft of the opening / closing arm and the lower edge opening edge of the outer frame is L1, and the opening / closing arm While the center-to-center distance between the connecting shaft and the rotating shaft is L2,
When the distance between the center of the connecting shaft that moves along the receiving portion and the lower end opening edge of the outer frame body is L when the inner frame body is opened with respect to the outer frame body,
A ceiling inspection port in which the length of the receiving portion is set so that a relationship of L ≧ L1 + L2 can be secured. 請求項５、又は６、又は７、又は８のいずれか一項に記載の天井点検口であって、
外枠体の外上壁部には、受止め部の開口部から開閉用アームの連結軸が抜け出ることを防止するための弾性体よりなる抜止部材が設けられ、
前記抜止部材は、その弾性変形によって前記開閉用アームの連結軸を抜け出しを許容する構成にしてある天井点検口。The ceiling inspection port according to any one of claims 5 or 6, or 7, or 8,
The outer upper wall portion of the outer frame body is provided with a retaining member made of an elastic body for preventing the connecting shaft of the opening / closing arm from coming out of the opening of the receiving portion,
The above-mentioned retaining member is a ceiling inspection port configured to allow the connecting shaft of the above-mentioned opening / closing arm to be pulled out by elastic deformation thereof. 請求項１〜９のいずれか一項に記載の天井点検口であって、
外上壁部と内上壁部との間の隙間内おいて開閉用アームがほぼ水平状態で配設されている天井点検口。The ceiling inspection port according to any one of claims 1 to 9,
A ceiling inspection port in which an opening / closing arm is disposed in a substantially horizontal state within a gap between an outer upper wall portion and an inner upper wall portion. 請求項１〜１０のいずれか一項に記載の天井点検口であって、
外枠体は、その外枠部が縦横の各外枠材によって形成されるとともに、これら縦横の各外枠材が外枠コ−ナ具によって矩形に枠組みされることによって構成され、
内枠体は、その内枠部が縦横の各内枠材によって形成されるとともに、これら縦横の各内枠材が内枠コ−ナ具によって矩形に枠組みされることによって構成されている天井点検口。The ceiling inspection port according to any one of claims 1 to 10,
The outer frame body is configured such that the outer frame portion is formed by vertical and horizontal outer frame members, and the vertical and horizontal outer frame members are rectangularly framed by outer frame corner tools,
The inner frame body is formed by the inner and lower inner frame members, and the vertical and horizontal inner frame members are rectangularly framed by the inner frame corner tool. mouth. 請求項１１に記載の天井点検口であって、
内枠体の内上壁部の外側には、外向きに開口する嵌込み溝が凹設され、
内枠コ−ナ具は直角状をなす翼片を有し、これら翼片が前記隣接する内枠材の嵌込み溝にそれぞれ差し込まれて固定されることによって内枠体が枠組され、
前記内枠コ−ナ具の一方の翼片に対し開閉用アームの長手方向の一端部が回動軸によって回動可能に装着されている天井点検口。The ceiling inspection port according to claim 11,
On the outside of the inner upper wall portion of the inner frame body, a fitting groove that opens outward is recessed,
The inner frame corner tool has right-angled wing pieces, and these wing pieces are respectively inserted into and fixed to the fitting grooves of the adjacent inner frame members, whereby the inner frame body is framed.
A ceiling inspection opening in which one end of the opening / closing arm in the longitudinal direction is attached to one wing piece of the inner frame corner tool so as to be rotatable by a rotation shaft. 請求項１１に記載の天井点検口であって、
隣接する内枠材の内上壁部のコーナ部近傍には、外側に向けてコーナ係合片がそれぞれ切り起し状に形成され、
内枠コ−ナ具は直角状をなしかつ前記各コーナ係合片に対応するスリット状の係合溝がそれぞれ設けられた翼片を有し、これら翼片が、その係合溝において前記コーナ係合片の上方から差し込まれて固定されることによって内枠体が枠組される一方、
前記隣接する内枠材のうち、一方の内枠材の内上壁部のコーナ部寄り外側面には、開閉用アームの長手方向の一端部を回動軸によって回動可能に装着するための座部が突設されている天井点検口。The ceiling inspection port according to claim 11,
In the vicinity of the corner portion of the inner upper wall portion of the adjacent inner frame member, corner engaging pieces are formed to be cut and raised toward the outside,
The inner frame corner tool has a wing piece having a right-angle shape and provided with slit-like engagement grooves corresponding to the respective corner engagement pieces. While the inner frame is framed by being inserted and fixed from above the engagement piece,
Among the adjacent inner frame members, one end portion in the longitudinal direction of the opening / closing arm is attached to the outer surface near the corner portion of the inner upper wall portion of one inner frame member so as to be rotatable by a rotation shaft. Ceiling inspection opening with a seat.
JP2000280488A 2000-09-14 2000-09-14 Ceiling access door Expired - Fee Related JP3698972B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527908B (en) * 2014-05-02 2021-06-09 Access Building Products Ltd Closure means and method of use thereof

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* Cited by examiner, † Cited by third party
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JP5424963B2 (en) * 2010-04-08 2014-02-26 ナカ工業株式会社 Ceiling access door
JP5686610B2 (en) * 2011-01-13 2015-03-18 株式会社ダイケン Inspection port structure
JP6381258B2 (en) * 2014-04-08 2018-08-29 ナカ工業株式会社 Ceiling access door
KR101890650B1 (en) * 2016-02-18 2018-08-28 송우용 Inspection hole integrated ceiling structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527908B (en) * 2014-05-02 2021-06-09 Access Building Products Ltd Closure means and method of use thereof

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