JP3934759B2

JP3934759B2 - Peep window

Info

Publication number: JP3934759B2
Application number: JP30996297A
Authority: JP
Inventors: 耕一篠原
Original assignee: 篠原電機株式会社
Priority date: 1997-10-23
Filing date: 1997-10-23
Publication date: 2007-06-20
Anticipated expiration: 2017-10-23
Also published as: JPH11125080A

Description

【０００１】
【発明の属する技術分野】
この発明は、分電盤や配電盤等のドアや外壁等に装着される覗き窓に関する。
【０００２】
【従来の技術】
この種の覗き窓は、壁面に通設した取付開口を内外から挟む外窓枠および内窓枠と、両窓枠で挟み固定される板ガラス、およびゴムパッキンなどで構成してある。窓枠の形成素材としては、アルミニウム条材を素材にするものと、アルミニウム、あるいはステンレス等の金属板材を素材にするものとがある。実開平４−１０５３９０号公報、および特開平８−９３３３７号公報の窓枠は前者に属し、特公平１−４０３３号公報、および登録実用新案第３００２５８３号公報の窓枠は後者に属する。
【０００３】
【発明が解決しようとする課題】
アルミニウム条材製の窓枠は、窓枠の形やサイズの変化に自在に対応できるうえ、十分な剛性を備えていて堅牢性に富む。窓枠の挟持面の面精度が高いので、両窓枠の締結力が大小にばらつく場合にも、確実にシール作用を発揮できる。しかし、所定長さに切断した条材を角枠状に曲げ加工した後、切断端どうしを溶接して枠体とするので、加工コストが高く付く。条材自体が特注品であるので素材コストも高く、全体として窓枠の製造コストが高い。
【０００４】
金属板材を素材とするプレス成形品からなる窓枠は、形やサイズは画一化されるものの、なにより製造コストが少なくて済み、覗き窓を廉価で提供できる。窓枠の軽量化にも役立つ。しかし、窓枠の挟持面の面精度が低いうえ、枠全体が波状にそり変形しやすいので、十分なシール作用が得られにくく、長期使用時の信頼性に欠ける。窓枠自体の強度が低いので、いたずら等によって破壊されやすく、保安上問題がある。こうした機能上の制約があるので、適用個所が事業所の構内や屋内等に限られてしまう。
【０００５】
この発明の目的は、プレス成形品からなる窓枠であるにも拘らず、十分な構造強度と面精度とを備えており、従って、アルミニウム条材製の窓枠に匹敵する堅牢さと、十分なシール性を発揮できる覗き窓を提供することにある。
この発明の他の目的は、窓枠を低コスト化できる分だけ覗き窓を廉価で提供でき、しかもアルミニウム条材製の窓枠を備えた覗き窓と同様に、あらゆる場所に設置される分電盤や配電盤に支障なく適用できる覗き窓を提供することにある。
【０００６】
【課題を解決するための手段】
この発明の覗き窓は、取付開口４の周縁壁を間にして内外に配置される外窓枠５、および内窓枠６と、両窓枠５・６で挟み固定される透明の板ガラス７と、両窓枠５・６と板ガラス７の間、および少なくとも外窓枠５と取付開口４の周縁壁との間に配置されるパッキン８・９とを含み、両窓枠５・６が取付開口４を内外に横切るねじ機構で締結してある。両窓枠５・６は、それぞれ金属板材をプレス成形した無端状の枠体からなる。外窓枠５は、内窓枠６の側へ向かって開口する断面コ字状の主枠部１２と、主枠部１２の開口縁の少なくとも一側から張り出した押圧脚１３とで形成する。ねじ機構は、外窓枠５の主枠部１２の内面に設けた掛止部１４と、掛止部１４に係合される掛止枠１９と、掛止枠１９に取付けられたねじ軸２０と、ねじ軸２０にねじ込まれるナット２１で構成する。
【０００７】
具体的には、外窓枠５は、内窓枠６の側へ向かって開口する断面コ字状の主枠部１２と、主枠部１２の開口縁の両側から張り出される押圧脚１３とで断面ハット形に形成する。前記掛止部１４は、主枠部１２の一対の脚壁１２ａを対向状に打ち出して形成されて、ハット形に形成した掛止枠１９の一対の掛止爪２２と係合する。内窓枠６は、外窓枠５の側へ向かって開口する断面コ字状の主枠部１５と、主枠部１５の開口縁の両側から張り出した押圧脚１６とでハット形断面状に形成する。板ガラス７を挟む押圧脚１６と、取付開口４を挟む押圧脚１６とを内外方向へ段違い状に形成して、板ガラス７を挟む押圧脚１６に連続する主枠部１５の脚壁１５ａを短くする。
【０００８】
【作用】
断面コ字状の主枠部１２と、主枠部１２の開口縁に張り出した押圧脚１３とで、外窓枠５を異形断面状に形成するので、従来のプレス成形された窓枠に比べて、外窓枠５の断面二次モーメントを増大し、その構造強度を十分に増強できる。ねじ機構を締め過ぎて過大な締結力が作用する場合にも、主枠部１２が変形するのを防止できる。無端状の主枠部１２を主構造体にして外窓枠５を形成するので、枠全体の自己保形力を増強でき、窓枠の取扱時や施工時に挟持面の全体が波状にそり変形し、あるいは押圧脚１３が局部的にたわみ変形するのを阻止できる。
【０００９】
【実施例】
図１ないし図５はこの発明に係る覗き窓の実施例を示す。図２において符号１は分電盤、２は分電盤１の出入口を開閉するドアである。左右一対のドア２は、それぞれヒンジ３で支持されて揺動開閉できる。両ドア２のうち右方のドア２の外壁に取付開口４を通設し、そこに本発明の覗き窓を装着している。覗き窓の内方には、電圧計、電流計、あるいは電力計等のメータ類が、覗き窓と正対する状態で配置してある。
【００１０】
図３および図４において、覗き窓は取付開口４の周縁壁を間にして内外に配置される外窓枠５、および内窓枠６と、両窓枠５・６で挟み固定される透明の板ガラス７と、両窓枠５・６と板ガラス７との間に配置されるガラス用のパッキン８と、両窓枠５・６と取付開口４の周縁壁との間に配置される壁用のパッキン９と、両窓枠５・６を締結するねじ機構などで構成する。
【００１１】
外窓枠５は、アルミニウム板材を素材にしてプレス成形した無端状の角枠体からなり、内窓枠６の側へ向かって開口する断面コ字状の主枠部１２と、主枠部１２の開口縁のそれぞれから外向きに張り出した一対の押圧脚１３・１３とで断面ハット形に形成する。外窓枠５の外縁側の縦横寸法は、取付開口４の縦横寸法よりひと回り大きく設定し、内縁側の縦横寸法は、板ガラス７の縦横寸法よりひと回り小さく設定する。また、図３に示すように、枠体の四隅はそれぞれ四分円状に丸めて、プレス加工を容易化し併わせて離型し易くする。成形後に、主枠部１２の一対の脚壁１２ａに掛止部１４を対向状に打ち出し形成する。掛止部１４は主枠部１２の周方向に沿って、８〜１０個所形成する。掛止部１４は脚壁１２ａをリブ状に打ち出して形成してもよい。
【００１２】
内窓枠６は、外的枠５と同様にアルミニウム板材を素材にしてプレス成形した無端状の角枠体からなり、外窓枠６の側へ向かって開口する断面コ字状の主枠部１５と、主枠部１５の開口縁のそれぞれから外向きに張り出した一対の押圧脚１６・１６とで、断面ハット形に形成する。内窓枠６が外窓枠５と異なるのは、主枠部１５の幅寸法が外窓枠５の主枠部１２の幅寸法に比べて小さく設定してあることと、板ガラス７を挟む側の押圧脚１６と、取付開口４を挟む無側の押圧脚１６とが内外方向へ段違い状に設けてあって、前者押圧脚１６に連続する主枠部１５の脚壁１５ａが短い点にある。板ガラス７の厚みが取付開口４の周縁壁よりぶ厚いためである。一対の脚壁１５ａを接続する主枠部１５の端壁１５ｂには、先の掛止部１４の形成位置に対応してねじ挿通用の穴１７が通設してある。
【００１３】
板ガラス７はその肉壁内に鋼線や鋼線網を埋設した網入りガラス板からなり、取付開口４の縦横寸法よりひと回り小さな縦横寸法に設定してある。
【００１４】
パッキン８・９はそれぞれゴムパッキンからなり、両窓枠５・６の押圧脚１３・１６に周回状に貼り付け固定される。先に説明したように、板ガラス７は取付開口４の周縁壁に比べて厚みが大きい。この厚みの差を吸収調整するために、内窓枠６の押圧脚１６と取付開口４の周縁壁との間に配置するパッキン９の厚みは他よりぶ厚く形成してある。
【００１５】
ねじ機構は、外窓枠５の主枠部１２の内面に設けた掛止部１４に係合される掛止枠１９と、掛止枠１９に溶接したねじ軸２０、およびねじ軸２０にねじ込まれるナット２１などで構成する。掛止枠１９はハット形断面のプレス金具からなり、図５に示すように一対の掛止爪２２を掛止部１４と主枠部１２の端壁１２ｂとの間に差し込み係合して外窓枠５に装着する。この装着状態において、掛止枠１９の枠端壁は、外窓枠５の押圧脚１３と同一平面上にあって、パッキン８・９を押圧脚１３と協同して受け止める（図１参照）。
【００１６】
覗き窓を取付開口４に装着した状態では、両窓枠５・６の外縁側の押圧脚１３・１６が、ハッキン９を介して取付開口４の周縁壁を内外に挟持し、内縁側の押圧脚１３・１６が、パッキン８を介して板ガラス７の周縁壁を内外に挟持する。ねじ軸２０は取付開口４と板ガラス７の間を内外に横切って、外窓枠５と内窓枠６とを連結している。ナット２１は内窓枠６の主枠部１５の穴１７に挿通したねじ軸２０にねじ込まれて、両窓枠５・６を互いに引き寄せる向きに締結する。
【００１７】
無端環状にプレス成形される外窓枠５の断面形状をハット形にするので、従来の窓枠に比べて断面二次モメントを十分に増強し、その構造強度を向上できる。ナット２１の締め過ぎによって過剰な締結力が作用する場合にも、十分な剛性を発揮できる。断面コ字状の主枠部１２は十分な自己保形力を発揮し、枠全体がそり変形するのを確実に防止する。また、ねじ機構１０の締結力を均等に押圧脚１３に伝える。従って、一対の押圧脚１３の挟持面の面精度を向上し、パッキン８・９の押圧力を均一化してシール不良を解消できる。内窓枠６も外窓枠５と同様の強度を発揮でき、各押圧脚１６の面精度を十分に向上できる。
【００１８】
外窓枠５および内窓枠６は、それぞれ図６に示すように、片側の押圧脚１３・１６を省略して、主枠部１２・１５の開口縁の一側に限って押圧脚１３・１６を設け異形断面形状にすることができる。この場合の押圧脚１３・１６は、板ガラス７を挟む側、つまり両窓枠５・６の内側周縁に設けて、板ガラス７に過大な挟持力が作用するのを避けるのが好ましいが、挟持力をパッキン８で分散させる場合には、図６で示すのとは逆に、各押圧脚１３・１６を外側周縁に限って設けることができる。
【００１９】
ねじ機構は、ナット２１やねじ筒を主枠部１２の端壁１２ｂにかしめ固定し、これにボルトをねじ込むようにしてもよい。
【００２０】
図７に掛止枠１９の一部を変更した別実施例を示す。そこでは、掛止枠１９の内面に部分円弧状の板ばね２３を掛止装着して、掛止爪２２を主枠部１２の掛止部１４に掛け止め係合した状態において、板ばね２３が弾性変形して掛止爪２２を掛止部１４に圧接するようにした。これにより、掛止枠１９ががた付くのを防止できるうえ、自重で掛止部１４から抜け出るのを阻止できる。なお、ねじ軸２０を掛止枠１９にかしめ固定する場合には、板ばね２３をねじ軸２０のかしめ部に外嵌して、共締め固定することができる。この場合の板ばね２３は台形状に折り曲げ形成して、その上辺部をねじ軸２０にかしめ固定する。
【００２１】
両窓枠５・６の正面視形状は、基本的には四隅が丸められた四角形状とするが、円形やだ円形などに変更できる。外窓枠５は内窓枠６と同様に、一対の押圧脚１３・１３が内外に段違い状になるように形成してもよい。
【００２２】
【発明の効果】
この発明では断面コ字形の主枠部１２と、その開口縁の少なくとも一側から張り出した押圧脚１３とで、外窓枠５を異形断面状ないしは断面ハット形の無端枠として形成するので、従来のプレス成形された窓枠に比べて、窓枠の構造強度と挟持面の面精度とを十分に向上できる。これにより、プレス成形品からなる窓枠を用いるにも拘らず、アルミニウム条材製の窓枠に匹敵する覗き窓を、より安価に提供できる。長期使用時にも十分なシール耐久性を発揮できるうえ、いたずら等では破壊できない十分な強度を備えているので、適用個所に制約がなく、アルミニウム条材製の窓枠を有する覗き窓と同様に、あらゆる場所に設置される分電盤や配電盤に広く適用できる。
【図面の簡単な説明】
【図１】図３におけるＡ−Ａ線断面図である。
【図２】覗き窓の適用例を示す斜視図である。
【図３】覗き窓の正面図である。
【図４】覗き窓の構成部品をそれぞれ分離した状態の断面図である。
【図５】図１におけるＢ−Ｂ線断面図である。
【図６】窓枠の変形例を示す断面図である。
【図７】掛止枠の変形例を示す断面図である。
【符号の説明】
４取付開口
５外窓枠
６内窓枠
７板ガラス
８パッキン
９パッキン
１２主枠部
１３押圧脚[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a viewing window attached to a door or an outer wall of a distribution board or a distribution board.
[0002]
[Prior art]
This type of viewing window is composed of an outer window frame and an inner window frame that sandwich an attachment opening provided in the wall surface from inside and outside, a plate glass that is sandwiched and fixed by both window frames, and rubber packing. As a material for forming the window frame, there are a material made of an aluminum strip material and a material made of a metal plate material such as aluminum or stainless steel. The window frames of Japanese Utility Model Laid-Open No. 4-105390 and Japanese Patent Application Laid-Open No. 8-93337 belong to the former, and the window frames of Japanese Patent Publication No. 1-4033 and registered utility model No. 3002583 belong to the latter.
[0003]
[Problems to be solved by the invention]
The window frame made of aluminum strips can respond to changes in the shape and size of the window frame as well as has sufficient rigidity and high robustness. Since the surface accuracy of the sandwiching surfaces of the window frames is high, even when the fastening force of both the window frames varies in size, the sealing action can be surely exhibited. However, after the strip material cut into a predetermined length is bent into a square frame shape, the cut ends are welded to form a frame body, which increases the processing cost. Since the strip itself is a custom-made product, the material cost is high, and the manufacturing cost of the window frame as a whole is high.
[0004]
A window frame made of a press-molded product made of a metal plate material has a uniform shape and size, but can be manufactured at a lower cost and can provide a viewing window at a low price. It also helps to reduce the weight of the window frame. However, since the surface accuracy of the sandwiching surface of the window frame is low and the entire frame is easily warped and deformed, it is difficult to obtain a sufficient sealing action, and reliability during long-term use is lacking. Since the strength of the window frame itself is low, it is easily broken by mischief and the like, and there is a security problem. Because of these functional restrictions, the applicable locations are limited to the premises and indoors of business establishments.
[0005]
Although the object of the present invention is a window frame made of a press-molded product, it has sufficient structural strength and surface accuracy, and therefore has robustness comparable to a window frame made of aluminum strip and sufficient The object is to provide a viewing window that can exhibit sealing properties.
Another object of the present invention is to provide a viewing window at a low price as much as the cost of the window frame can be reduced, and in addition to a viewing window having a window frame made of aluminum strips, a power distribution device installed at any place. The object is to provide a viewing window that can be applied to panels and switchboards without any problems.
[0006]
[Means for Solving the Problems]
The viewing window according to the present invention includes an outer window frame 5 and an inner window frame 6 disposed inside and outside with a peripheral wall of the mounting opening 4 therebetween, and a transparent plate glass 7 sandwiched and fixed between the window frames 5 and 6. , Packings 8 and 9 disposed between the window frames 5 and 6 and the plate glass 7 and at least between the outer window frame 5 and the peripheral wall of the mounting opening 4. 4 is fastened by a screw mechanism crossing inward and outward. Both the window frames 5 and 6 are endless frames obtained by press-molding metal plate materials . The outer window frame 5 is formed by a main frame portion 12 having a U-shaped cross section that opens toward the inner window frame 6 side, and a pressing leg 13 that protrudes from at least one side of the opening edge of the main frame portion 12. The screw mechanism includes a latching portion 14 provided on the inner surface of the main frame portion 12 of the outer window frame 5, a latching frame 19 engaged with the latching portion 14, and a screw shaft 20 attached to the latching frame 19. And a nut 21 screwed into the screw shaft 20.
[0007]
Specifically, the outer window frame 5 includes a main frame portion 12 having a U-shaped cross section that opens toward the inner window frame 6, and pressing legs 13 that project from both sides of the opening edge of the main frame portion 12. To form a cross-sectional hat shape. The latching portion 14 is formed by striking a pair of leg walls 12a of the main frame portion 12 so as to face each other, and engages with a pair of latching claws 22 of the latching frame 19 formed in a hat shape. The inner window frame 6 has a hat-shaped cross section with a U-shaped main frame portion 15 that opens toward the outer window frame 5 and pressing legs 16 that project from both sides of the opening edge of the main frame portion 15. Form. The pressing leg 16 sandwiching the plate glass 7 and the pressing leg 16 sandwiching the mounting opening 4 are formed in a stepped shape inward and outward, and the leg wall 15a of the main frame portion 15 continuous to the pressing leg 16 sandwiching the plate glass 7 is shortened. .
[0008]
[Action]
Since the outer window frame 5 is formed in a deformed cross-sectional shape by the main frame part 12 having a U-shaped cross section and the pressing leg 13 projecting from the opening edge of the main frame part 12, compared with a conventional press-molded window frame. Thus, the cross-sectional secondary moment of the outer window frame 5 can be increased, and the structural strength can be sufficiently enhanced. Even when the screw mechanism is overtightened and an excessive fastening force is applied, the main frame portion 12 can be prevented from being deformed. Since the outer window frame 5 is formed using the endless main frame 12 as the main structure, the self-holding force of the entire frame can be increased, and the entire clamping surface is warped and deformed during handling and construction of the window frame. Alternatively, it is possible to prevent the pressing leg 13 from being locally bent and deformed.
[0009]
【Example】
1 to 5 show an embodiment of a viewing window according to the present invention. In FIG. 2, reference numeral 1 is a distribution board, and 2 is a door that opens and closes the entrance / exit of the distribution board 1. The pair of left and right doors 2 are supported by hinges 3 and can swing open and close. The mounting opening 4 is provided in the outer wall of the door 2 on the right side of the doors 2, and the viewing window of the present invention is attached thereto. Inside the viewing window, meters such as a voltmeter, an ammeter, and a wattmeter are arranged so as to face the viewing window.
[0010]
3 and 4, the viewing window is a transparent window sandwiched and fixed between the outer window frame 5 and the inner window frame 6, which are arranged inside and outside with the peripheral wall of the mounting opening 4 therebetween. For the glass plate 8, the glass packing 8 disposed between the window frames 5, 6 and the plate glass 7, and the wall disposed between the window frames 5, 6 and the peripheral wall of the mounting opening 4. It is composed of a packing 9 and a screw mechanism for fastening both window frames 5 and 6.
[0011]
The outer window frame 5 is composed of an endless rectangular frame body that is press-molded using an aluminum plate material, and has a U-shaped main frame portion 12 that opens toward the inner window frame 6 side, and a main frame portion 12. A pair of pressing legs 13 and 13 projecting outward from each of the opening edges of each other is formed into a cross-sectional hat shape. The vertical and horizontal dimensions on the outer edge side of the outer window frame 5 are set to be slightly larger than the vertical and horizontal dimensions of the mounting opening 4, and the vertical and horizontal dimensions on the inner edge side are set to be slightly smaller than the vertical and horizontal dimensions of the plate glass 7. Also, as shown in FIG. 3, the four corners of the frame are rounded into quadrants to facilitate the pressing process and facilitate the release. After molding, the latching portions 14 are formed so as to face each other on the pair of leg walls 12a of the main frame portion 12. The hooking portions 14 are formed at 8 to 10 locations along the circumferential direction of the main frame portion 12. The hooking portion 14 may be formed by punching the leg wall 12a into a rib shape.
[0012]
The inner window frame 6 is composed of an endless square frame body that is press-molded using an aluminum plate material as in the case of the outer frame 5, and has a U-shaped main frame portion that opens toward the outer window frame 6. 15 and a pair of pressing legs 16 and 16 projecting outward from each of the opening edges of the main frame portion 15 to form a hat shape in cross section. The inner window frame 6 is different from the outer window frame 5 in that the width of the main frame 15 is set smaller than the width of the main frame 12 of the outer window frame 5 and the side sandwiching the plate glass 7 The pressing leg 16 and the non-side pressing leg 16 sandwiching the mounting opening 4 are provided in steps inward and outward, and the leg wall 15a of the main frame portion 15 continuing to the former pressing leg 16 is short. . This is because the thickness of the plate glass 7 is thicker than the peripheral wall of the mounting opening 4. The end wall 15b of the main frame portion 15 that connects the pair of leg walls 15a is provided with a screw insertion hole 17 corresponding to the position where the previous latching portion 14 is formed.
[0013]
The plate glass 7 is made of a meshed glass plate in which a steel wire or a steel wire net is embedded in its wall, and is set to a vertical and horizontal dimension that is slightly smaller than the vertical and horizontal dimensions of the mounting opening 4.
[0014]
The packings 8 and 9 are each made of rubber packing, and are fixed to the pressing legs 13 and 16 of the window frames 5 and 6 in a circular manner. As described above, the plate glass 7 is thicker than the peripheral wall of the mounting opening 4. In order to absorb and adjust the difference in thickness, the thickness of the packing 9 disposed between the pressing leg 16 of the inner window frame 6 and the peripheral wall of the mounting opening 4 is made thicker than the others.
[0015]
The screw mechanism includes a latching frame 19 that is engaged with a latching portion 14 provided on the inner surface of the main frame 12 of the outer window frame 5, a screw shaft 20 welded to the latching frame 19, and a screw shaft 20. The nut 21 is used. The retaining frame 19 is formed of a hat-shaped press fitting, and a pair of retaining claws 22 are inserted and engaged between the retaining portion 14 and the end wall 12b of the main frame portion 12 as shown in FIG. Mount on the window frame 5. In this mounted state, the frame end wall of the retaining frame 19 is on the same plane as the pressing leg 13 of the outer window frame 5, and receives the packings 8 and 9 in cooperation with the pressing leg 13 (see FIG. 1).
[0016]
In a state in which the observation window is mounted on the mounting opening 4, the pressing legs 13 and 16 on the outer edge side of both the window frames 5 and 6 sandwich the peripheral wall of the mounting opening 4 inside and outside through the hatch 9, and press on the inner edge side. The legs 13 and 16 sandwich the peripheral wall of the plate glass 7 inside and outside through the packing 8. The screw shaft 20 crosses between the mounting opening 4 and the plate glass 7 inward and outward to connect the outer window frame 5 and the inner window frame 6. The nut 21 is screwed into the screw shaft 20 inserted through the hole 17 of the main frame portion 15 of the inner window frame 6, and fastens the window frames 5 and 6 in a direction to draw them together.
[0017]
Since the cross-sectional shape of the outer window frame 5 press-molded in an endless ring shape is a hat shape, the cross-sectional secondary moment can be sufficiently enhanced as compared with the conventional window frame, and the structural strength can be improved. Even when an excessive fastening force acts due to overtightening of the nut 21, sufficient rigidity can be exhibited. The main frame portion 12 having a U-shaped cross section exhibits a sufficient self-holding force and reliably prevents the entire frame from being warped and deformed. Further, the fastening force of the screw mechanism 10 is equally transmitted to the pressing leg 13. Therefore, the surface accuracy of the clamping surfaces of the pair of pressing legs 13 can be improved, the pressing force of the packings 8 and 9 can be made uniform, and the sealing failure can be eliminated. The inner window frame 6 can exhibit the same strength as the outer window frame 5, and the surface accuracy of each pressing leg 16 can be sufficiently improved.
[0018]
As shown in FIG. 6, the outer window frame 5 and the inner window frame 6 omit the pressing legs 13, 16 on one side, and are limited to one side of the opening edge of the main frame parts 12, 15. 16 can be provided to have an irregular cross-sectional shape. In this case, it is preferable that the pressing legs 13 and 16 are provided on the side sandwiching the plate glass 7, that is, on the inner periphery of the two window frames 5 and 6, so that an excessive holding force acts on the plate glass 7. If the packing 8 is dispersed, the pressing legs 13 and 16 can be provided only on the outer periphery, contrary to the case shown in FIG.
[0019]
Screw mechanism, nuts 21 caulking and fixing a Yaneji cylinder end wall 12b of the main frame portion 12, to which may be screwed a bolt.
[0020]
FIG. 7 shows another embodiment in which a part of the retaining frame 19 is changed. In this state, the plate spring 23 is mounted in a state in which a partial arc-shaped plate spring 23 is latched and attached to the inner surface of the latch frame 19 and the latch claw 22 is latched and engaged with the latch portion 14 of the main frame portion 12. Is elastically deformed so that the latching claw 22 is pressed against the latching portion 14. Thereby, it is possible to prevent the latching frame 19 from rattling and to prevent the latching frame 19 from coming out of the latching portion 14 by its own weight. When the screw shaft 20 is caulked and fixed to the retaining frame 19, the leaf spring 23 can be externally fitted to the caulking portion of the screw shaft 20 and fixed together. In this case, the leaf spring 23 is bent and formed in a trapezoidal shape, and its upper side portion is caulked and fixed to the screw shaft 20.
[0021]
The front-view shape of both the window frames 5 and 6 is basically a quadrangular shape with four rounded corners, but can be changed to a circular shape or an oval shape. Similarly to the inner window frame 6, the outer window frame 5 may be formed so that a pair of pressing legs 13 and 13 are stepped inward and outward .
[0022]
【The invention's effect】
In the present invention, the outer window frame 5 is formed as an endless frame having a modified cross-sectional shape or a cross-sectional hat shape by the main frame portion 12 having a U-shaped cross section and the pressing leg 13 protruding from at least one side of the opening edge. Compared to the press-molded window frame, the structural strength of the window frame and the surface accuracy of the clamping surface can be sufficiently improved. Thereby, although a window frame made of a press-molded product is used, a viewing window comparable to an aluminum strip window frame can be provided at a lower cost. Since it can exhibit sufficient seal durability even during long-term use and has sufficient strength that it can not be destroyed by mischief etc., there are no restrictions on the application place, just like a viewing window with an aluminum strip window frame, It can be widely applied to distribution boards and switchboards installed everywhere.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along line AA in FIG.
FIG. 2 is a perspective view showing an application example of a viewing window.
FIG. 3 is a front view of a viewing window.
FIG. 4 is a cross-sectional view showing a state in which the components of the viewing window are separated from each other.
FIG. 5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a cross-sectional view showing a modified example of the window frame.
FIG. 7 is a cross-sectional view showing a modified example of the retaining frame.
[Explanation of symbols]
4 Mounting opening 5 Outer window frame 6 Inner window frame 7 Sheet glass 8 Packing 9 Packing 12 Main frame 13 Pressing leg

Claims

Transparent window glass sandwiched and fixed between the outer window frame (5) and the inner window frame (6), which are arranged inside and outside with the peripheral wall of the mounting opening (4) interposed therebetween (5, 6). 7) and packings (8, 9) disposed between the window frames (5, 6) and the glass sheet (7) and at least between the outer window frame (5) and the peripheral wall of the mounting opening (4). Including
A viewing window in which both window frames (5, 6) are fastened with a screw mechanism that crosses the mounting opening (4) in and out,
Both window frames (5, 6) consist of endless frames made by press-molding metal plates, respectively.
The outer window frame (5) projects from at least one side of the opening edge of the main frame portion (12) and the main frame portion (12) having a U-shaped cross section that opens toward the inner window frame (6). Formed with the pressing leg (13) ,
A screw mechanism is attached to the latching frame (19) engaged with the latching part (14) provided on the inner surface of the main frame part (12) of the outer window frame (5), and the latching frame (19). A viewing window comprising a screw shaft (20) and a nut (21) screwed into the screw shaft (20) .

The outer window frame (5) has a U-shaped main frame portion (12) that opens toward the inner window frame (6) side, and a pressure protruding from both sides of the opening edge of the main frame portion (12). It is formed in a cross-sectional hat shape with the legs (13) ,
A pair of latching claws of the latching frame (19) in which the latching part (14) is formed by striking a pair of leg walls (12a) of the main frame part (12) so as to face each other. The sight glass according to claim 1 engaged with (22) .

A main frame part (15) having a U-shaped cross section in which the inner window frame (6) opens toward the outer window frame (5), and a pressing leg projecting from both sides of the opening edge of the main frame part (15) (16) and a hat-shaped cross section ,
A pressing leg (16) that sandwiches the plate glass (7) and a pressing leg (16) that sandwiches the mounting opening (4) are formed stepwise inward and outward, and are continuous with the pressing leg (16) that sandwiches the plate glass (7). The viewing window according to claim 1 or 2, wherein the leg wall (15a) of the main frame portion (15) to be short is short .