JPH01102188A - Door device - Google Patents

Abstract

PURPOSE: To allow persons to pass door devices straight without wasting movements and without hindrance by designing their doors paired in left and right to move apart horizontally during a veer until opening parallel to the entrance wall. CONSTITUTION: When an opening/closing lever is pulled, the base end of a bottom support arm 7 is forced to swing it, with the result that a main shaft 8 is turned and that a door pivot 4 journalled at the tip of a top support arm 6 is slid back within a slot 13a of a horizontal swing rod 13 in an arc orbit about the main shaft 8. The pivot 4 is kept from rotating by a detent plate 14 movable along the axis of the swing rod 13 and pressed against the pivot 4 by a compression spring 16. As the pivot 4 moves, a door 1 is moved outward horizontally during a gradual veer until opening parallel to an entrance wall or perpendicularly to the original position. In this motion, the door 1 synchronizes with or opens another door 2 via an interlock mechanism.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明はドアー装置に関し、更に詳細には、開くときに
、左右一対の扉が、夫々外側に水平に移動しつつ回動し
、最終的に出入口の側壁と平行になるようになした新規
なドアー装置に係わる。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a door device, and more specifically, when opening, a pair of left and right doors rotate while horizontally moving outward, and the final This relates to a new door device that is parallel to the side wall of the entrance.

「従来の技術」 従来のドアーは、左右いずれかの側縁部を出入口の側壁
に蝶番をもって枢着する構造であるから、通行者がドア
ーを開こうとすると、ドアーは蝶番を支点として大きく
スイングするものである。したがって、このようにドア
ーが大きくスイングして開くために、手前に引くときに
は一歩後退しなければならず、また通常はドアー全全開
しないで出入シすることが多く、この場合には身体を横
にずらせてから通らなければならない。``Prior Art'' Conventional doors have a structure in which either the left or right side edge is hinged to the side wall of the entrance, so when a passerby tries to open the door, the door swings wide using the hinge as a fulcrum. It is something to do. Therefore, because the door swings open like this, you have to take a step back when you pull it forward, and you often enter or exit without opening the door fully, in which case you turn your body to the side. You have to move it and then pass.

また、従来のドアーは前記の如くであるから、特に身体
障害者や車椅子使用者にとっては、ドアーの開閉がスム
ーズにいかず、きわめて骨が折れることであったのであ
る。Moreover, since conventional doors are as described above, opening and closing the doors cannot be done smoothly, which is extremely tiring, especially for physically disabled people and wheelchair users.

「発明が解決しようとする問題点」 本発明は上記の点に鑑みなされたものであって、扉を２
枚１組とし、開くときに、夫々の扉が外側に水平に移動
しつつ回動し、最終的に出入口の側壁と平行になるよう
になし、以って扉を開くときに一々後退したシ、横にず
れたシする必要をなくした新規なドアー装置全提供せん
とするものである。``Problems to be solved by the invention'' The present invention has been made in view of the above points.
When opened, each door moves outward horizontally and rotates until it is parallel to the side wall of the entrance. The present invention aims to provide a novel door device that eliminates the need for sideways sliding.

「問題点全解決するための手段」 然して、本発明の要旨は、方形状の主枠と該主枠の上下
に前後方向へ一体的に張り出した副枠とによって構成し
た枠体内に左右一対の扉を配設し、該一対の扉の夫々の
幅方向の中心部の上下に扉支軸全突設すると共に該扉支
軸の夫々を前記主枠の垂直部内に回動自在に保持した主
軸の上下端部から水平に張シ出した支持腕の先端部に回
動自在に保持せしめ、他方前記副枠内において、前記主
軸及び扉支軸の一軸心とそれ自身の軸心とヲ線で結ぶと
正三角形となる位置に垂直な支軸を設け、該支軸をもっ
て、先端部から長さ方向の略中央部にかけて前記上部側
の扉支軸全摺動自在１１Ｃ嵌合する長孔全般けた水平揺
動杆の基部全水平方向回動自在に軸支し、更に先端部に
該水平揺動杆の長孔に沿った所要幅の切込溝を設け、該
切込溝内に前記上部側の扉支軸の薄肉とした軸部を嵌入
させた回動規制板に枠部を形成し、該枠部に前記水平揺
動杆を摺動自在に嵌合すると共に、該回動規制板を拡圧
ばねをもって常時その先端部が前記上部側の扉支軸に接
触するよう附勢し、更に前記主枠の上部側の水平部分内
において、長さ方向の中心部を水平方向回動自在に軸着
したリンクと、該リンクの両側の端部と前記左右の扉の
夫々の上部側の扉支軸とを連結するリンクとをもって左
右の主軸を連動せしめ、更に該左右の主軸を適宜の回動
機構をもって回動せしめるべくなしたドアー装置にある
。"Means for Solving All Problems" However, the gist of the present invention is to provide a pair of left and right panels in a frame body constituted by a rectangular main frame and sub-frames that integrally project in the front and back direction above and below the main frame. A main shaft on which a door is disposed, a door support shaft fully protruding above and below the widthwise center of each of the pair of doors, and each of the door support shafts is rotatably held within a vertical portion of the main frame. It is rotatably held at the tip of a support arm extending horizontally from the upper and lower ends of the support arm, and on the other hand, within the sub-frame, one axis of the main shaft and the door support shaft is aligned with the axis of itself. A vertical support shaft is provided at a position that forms an equilateral triangle when tied together, and with this support shaft, the entire elongated hole in which the upper door support shaft 11C is fitted is fitted, extending from the tip to the approximate center in the length direction. The base of the horizontal swinging rod is pivoted so as to be rotatable in the entire horizontal direction, and a cut groove of a required width is provided at the tip along the long hole of the horizontal swinging rod, and the upper part is inserted into the cut groove. A frame portion is formed in the rotation regulating plate into which the thin shaft portion of the side door support shaft is fitted, and the horizontal swinging rod is slidably fitted into the frame portion, and the rotation regulating plate is fitted with a frame portion. is energized by a pressure expansion spring so that its tip is always in contact with the upper door support shaft, and furthermore, within the upper horizontal portion of the main frame, the center of the length direction can be freely rotated in the horizontal direction. The left and right main shafts are interlocked by a link that is pivoted on the link, and a link that connects both ends of the link to the upper door support shaft of each of the left and right doors, and further, the left and right main shafts are connected to each other as appropriate. The door device has a rotating mechanism and is designed to be rotated.

以下、本発明を図示した実施例に即して更に詳細に説明
する。Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments.

第１図はドアー装置全体の正面図、第２図は簡略化して
示した中央縦断正面図、第３図は第２図中Ａ−Ａ線拡大
断面図、第４図は第３図中Ｂ−Ｂ線拡大断面図、第５図
は扉支軸の部分拡大正面図、第６図は第５図中Ｃ−Ｃ線
断面図、第７図は第５図中Ｃ−Ｃ線断面図、第８図は第
５図中Ｃ−Ｃ線断面図、第９図は主軸回動部の縦断面図
、第１０図は第５図中Ｃ−Ｃ線断面図、第１１図は連動
機構の説明図、第１２図は作動態様の説明図、第１３図
は作動時における扉支軸と扉の移動軌跡を示す説明図で
ある。Fig. 1 is a front view of the entire door device, Fig. 2 is a simplified central vertical sectional front view, Fig. 3 is an enlarged sectional view taken along line A-A in Fig. 2, and Fig. 4 is B in Fig. 3. -B enlarged sectional view, Fig. 5 is a partially enlarged front view of the door support shaft, Fig. 6 is a sectional view taken along line C-C in Fig. 5, Fig. 7 is a sectional view taken along line C-C in Fig. 5, Figure 8 is a sectional view taken along the line C-C in Figure 5, Figure 9 is a longitudinal sectional view of the main shaft rotating section, Figure 10 is a sectional view taken along the line CC in Figure 5, and Figure 11 is a cross-sectional view of the interlocking mechanism. An explanatory diagram, FIG. 12 is an explanatory diagram of the operating mode, and FIG. 13 is an explanatory diagram showing the movement locus of the door support shaft and the door during the operation.

図中、１，２は左右一対の扉である。３は該扉１．２を
支持する枠体であシ、後記主軸及び支持腕を内装する方
形状の主枠３ａと、該主枠３ａの上下部に前後方向に一
体的に張シ出し、後記支軸及び水平揺動杆等を内装する
副枠３ｂ、３ｂとによって構成されている。また、該副
枠３ｂ　、　３ｂには夫々後記扉支軸の移動する軌跡に
沿って円弧状の溝３ｂ’、３ｂ’が穿設されている。In the figure, 1 and 2 are a pair of left and right doors. 3 is a frame supporting the door 1.2, which includes a rectangular main frame 3a that houses a main shaft and a supporting arm described later, and integrally extends from the top and bottom of the main frame 3a in the front and back direction; It is constituted by sub-frames 3b, 3b in which a support shaft and a horizontal swinging rod, etc., which will be described later, are housed. Further, arc-shaped grooves 3b', 3b' are bored in the sub-frames 3b, 3b, respectively, along the trajectory of movement of the door support shaft described later.

４．５は前記扉１，２の夫々幅方向の中心部の上下に突
設した扉支軸であシ、先端部は後記支持腕の先端部に回
動自在に保持されている。また、上部側の扉支軸４の先
端部は、後記回動規制板の切込溝に対応する幅の軸部４
ａｅ残すようにして周面の一部を切欠している。尚、該
軸部４ａの軸線（第６図中Ｐ）は前記扉１．２と直交す
るようになされている。Reference numeral 4.5 denotes a door support shaft which protrudes above and below the widthwise center of each of the doors 1 and 2, the tip of which is rotatably held by the tip of a support arm described later. In addition, the tip of the upper door support shaft 4 has a width corresponding to the notch groove of the rotation regulating plate described later.
A part of the circumferential surface is cut out so as to leave the ae portion. The axis of the shaft portion 4a (P in FIG. 6) is perpendicular to the door 1.2.

６．７は先端部に前記扉支軸４，５ｔ−夫々回動自在に
保持する支持腕でちゃ、後記主軸の上下端部から水平に
張シ出すものである。Reference numeral 6.7 denotes a support arm which rotatably holds the door support shafts 4 and 5t at the tip thereof, and extends horizontally from the upper and lower ends of the main shaft, which will be described later.

８．９は主軸であシ、前記主枠３ａの左右の垂直部に内
装され、適宜の軸受部材１０．１１によって回動自在に
保持されている。A main shaft 8.9 is installed in the left and right vertical parts of the main frame 3a, and is rotatably held by appropriate bearing members 10.11.

１２は前記副枠３ｂ内に垂直に固定された支軸であシ、
後記水平揺動杆の基部を水平方向回動自在に支持するも
のである。また、該支軸１２は、それ自身の軸心と前記
主軸８，９及び扉支軸４の夫々の軸心とを線で結ぶと正
三角形となる位置に固定されている。12 is a support shaft fixed vertically within the sub-frame 3b;
It supports the base of the horizontal swinging rod described later so that it can rotate freely in the horizontal direction. Further, the support shaft 12 is fixed at a position that forms an equilateral triangle when its own axis and the respective axes of the main shafts 8, 9 and the door support shaft 4 are connected by a line.

１３は基部を前記支軸１２に回動自在に支持された水平
揺動杆であシ、先端部から長さ方向の略中央部にかけて
前記扉支軸４の先端部全摺動自在に嵌合する長孔１３ａ
ｋ設けている。Reference numeral 13 is a horizontal swinging rod whose base is rotatably supported by the support shaft 12, and the entire end of the door support shaft 4 is slidably fitted from the end to the approximate center in the length direction. long hole 13a
k is provided.

１４ａｅ設けると共に後端部には前記水平揺動杆１３を
摺動自在に嵌合する枠部１４ｂを形成している。また、
該回動規制板１４には更にばね受部１４ｃｋ側方に突設
している。尚、前記切込清１４ａ内には前記上部側の扉
支軸４の軸部４ａが嵌入されている。14ae, and a frame portion 14b is formed at the rear end into which the horizontal swinging rod 13 is slidably fitted. Also,
The rotation regulating plate 14 further has a spring receiving portion 14ck protruding from the side. The shaft portion 4a of the upper door support shaft 4 is fitted into the notch 14a.

１５は前記支軸１２に回動自在に取着されたばね受部材
である。15 is a spring bearing member rotatably attached to the support shaft 12.

１６は該ばね受部材１４と前記回動規制板１４のばね受
部１４Ｃとの間に配設した拡圧ばねであシ、常時前記回
動規制板１４全扉支軸４に押し付けるように作用するも
のである。Reference numeral 16 denotes a pressure expansion spring disposed between the spring receiving member 14 and the spring receiving portion 14C of the rotation regulating plate 14, and acts to constantly press the rotation regulating plate 14 against the entire door support shaft 4. It is something to do.

１７は主軸８．９の回動機構であシ、本実施例にあって
は手動式の回動機構を示している。17 is a rotation mechanism for the main shaft 8.9, and in this embodiment, a manual rotation mechanism is shown.

該手動式の回動機構１７は、前記下部側の副枠３ｂの左
右側の端部であって、前記支軸１２と反対側の部分に立
設した支柱１８と、該支柱１８に長さ方向の中心部を前
後方向回動自在に軸着された開閉操作杆１９と、副枠３
ｂ内において、前記開閉操作杆１９の下端部に一端側を
枢着連結すると共に他端側を前記下部側の支持腕７の基
部に突設した連結板７ａに枢着連結しｉ　ＩＪンク２０
とからなるものである。The manual rotation mechanism 17 includes a column 18 that is erected at the left and right ends of the lower sub-frame 3b and opposite to the support shaft 12, and a column 18 that has a length. An opening/closing operation rod 19 pivotally attached to the center of the direction so as to be rotatable in the front and rear directions, and a subframe 3
In b, one end is pivotally connected to the lower end of the opening/closing operation rod 19, and the other end is pivotally connected to a connecting plate 7a protruding from the base of the lower support arm 7.
It consists of.

尚、主軸９側の回動機構については説明を省略している
。Note that a description of the rotation mechanism on the main shaft 9 side is omitted.

また、本実施例にあっては手動式の回動機構全示してい
るが、図示はしないがモータ等を使用して電動式とする
ことも可能である。Further, in this embodiment, a manual rotation mechanism is shown entirely, but it is also possible to use an electric type using a motor or the like, although not shown.

２１は左右の扉１，２の連動機構であり、前記主枠３ａ
の上部側の水平部分内において、長さ方向の中心部全水
平方向回動自在に軸着されたリンク２２と、該リンク２
２の両側の端部と前記上部側の扉支軸４．４とを連結す
るリンク２３．２３とからなるものである。21 is an interlocking mechanism for the left and right doors 1 and 2, and the main frame 3a
a link 22 which is rotatably pivoted in the entire horizontal direction at the center in the longitudinal direction within the horizontal part of the upper side of the link 2;
It consists of links 23.23 that connect the ends on both sides of 2 and the upper door support shaft 4.4.

「作　用」 次に、上記構成からなる本発明の作用態様について説明
する。"Function" Next, the mode of action of the present invention having the above configuration will be explained.

尚、説明の便宜上先ず扉１側の開閉作用について説明す
る。For convenience of explanation, the opening/closing action of the door 1 side will be explained first.

扉１，２に接近し、開閉操作杆１９を手前に引くと、第
９図及び第１０図に示す如く、操作杆１９はその長さ方
向の中心部の軸を回動支点として回動し、その下端部は
後方側に移動する。これに伴い下部側の支持腕７の基部
は押圧されて水平方向に回動する。これによって主軸８
が回動せしめられるものである。そして、該主軸８の回
動と共に水平に後方側に回動する支持腕７の先端部に支
承された扉支軸４は、第３図及び第１２図に示す如く主
軸８全中心とする円弧の軌跡を描くように後方側に移動
する。このとき、該扉支軸４は、水平揺動杆１３の長孔
１３ａ内を摺動しながら徐々に後方側に移動するが、該
水平揺動杆１３にその軸方向に移動可能に支えられ且つ
拡圧ばね１６によって該扉支軸４１Ｃ向けて押圧附勢さ
れている回動規制板１４によって、該支軸４自体の回動
は阻止されている。即ち、扉支軸４の前記軸部４ａの軸
線Ｐは常に支軸１２と一致するようになされているので
ある。When you approach the doors 1 and 2 and pull the opening/closing operating lever 19 toward you, the operating lever 19 rotates about its longitudinal center axis as a pivot point, as shown in FIGS. 9 and 10. , its lower end moves toward the rear. Accordingly, the base of the lower support arm 7 is pressed and rotated in the horizontal direction. As a result, the main shaft 8
can be rotated. The door support shaft 4 supported by the tip of the support arm 7, which rotates horizontally rearward with the rotation of the main shaft 8, is arranged in a circular arc with the entire center of the main shaft 8 as shown in FIGS. 3 and 12. Move backwards as if tracing a trajectory. At this time, the door support shaft 4 gradually moves rearward while sliding within the long hole 13a of the horizontal swinging rod 13, but is supported by the horizontal swinging rod 13 so as to be movable in its axial direction. Further, rotation of the support shaft 4 itself is prevented by the rotation restriction plate 14 which is urged toward the door support shaft 41C by the expansion spring 16. That is, the axis P of the shaft portion 4a of the door support shaft 4 is always aligned with the support shaft 12.

これによシ、扉１は第１３図に示す如く、扉支軸４の後
方側への移動に伴って外側に水平移動しつつ徐々に向き
が変わシ、最終的に原位置と直角になって即ち出入口の
側壁（図示せず。）と平行になって開くものである。As a result, as shown in Fig. 13, the door 1 gradually changes direction while moving horizontally outward as the door support shaft 4 moves rearward, and finally becomes perpendicular to its original position. That is, it opens parallel to the side wall (not shown) of the entrance/exit.

また、扉１が開くときには、連動機構２１を介して反対
側の扉２も同期して開くものであシ、それは第１１図に
示す如く、扉１側の扉支軸４が後方側に移動すると、リ
ンク２３．２２．２３’に介して扉２側の扉支軸４が前
方側に移動することによって行われる。したがって、ま
た扉１と扉２は前後に、反対方向に開くものである。Furthermore, when the door 1 opens, the door 2 on the opposite side also opens in synchronization via the interlocking mechanism 21, and as shown in FIG. 11, the door support shaft 4 on the door 1 side moves rearward. Then, the door support shaft 4 on the door 2 side moves forward via the links 23, 22, 23'. Therefore, the door 1 and the door 2 open back and forth in opposite directions.

また、扉１，２を通シ抜けた時には、通シ抜けた側にあ
る操作杆を操作して扉１，２を元通シに閉じるものであ
る。Furthermore, when the user passes through the doors 1 and 2, the operator operates the operating lever on the side from which the door was passed through to close the doors 1 and 2 back to their original state.

「発明の効果」 本発明は上記の如き構成、作用であシ、開くときに、左
右一対の扉が、夫々外側に水平に移動しつつ回動し、最
終的に出入口の側壁と平行になるものであるから、従来
のスイング式のドアーの如く開く時に一々後退したシ、
横にずれたシする必要がなく、そのまま直進することが
できる。したがって、特に身体障害者や車椅子使用者に
とってはスムーズに出入シが出来、福音となるものであ
る。また、左右の扉は出入口の側壁と平行になるように
全開するから、狭い通路に用いると最適である。更にま
た少い動作で機敏に全開するから、通行がスムーズであ
シ、加えてリズミカルに運動する左右の扉の開閉運動は
、通行者に好感を持たせる等、実用に供し稗益する処多
大なるものがあ１す る。"Effects of the Invention" The present invention has the above-mentioned configuration and operation, and when opened, the pair of left and right doors rotate while moving outward horizontally, and finally become parallel to the side wall of the entrance. Because it is a traditional swing-type door, it does not move backwards when opening,
There is no need to move sideways, and you can continue straight ahead. Therefore, it is especially good for people with physical disabilities and wheelchair users, who can get in and out smoothly. Additionally, the left and right doors open fully parallel to the side walls of the entrance, making it ideal for use in narrow passages. Furthermore, since it opens fully and quickly with a few movements, passing through is smooth.In addition, the rhythmic opening and closing movement of the left and right doors creates a good impression on passersby, and has many practical uses and benefits. There will be 1.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はドアー装置全体の正面図、第２図は簡略化して
示した中央縦断正面図、第３図は第２図中Ａ−Ａ線拡大
断面図、第４図は第３図中Ｂ−Ｂ線拡大断面図、第５図
は扉支軸の部分拡大正面図、第６図は第５図中Ｃ−Ｃ線
断面図、第７図は第５図中Ｃ−Ｃ線断面図、第８図は第
４図中Ｅ−Ｅ）ｌｉｉ断面図、第９図は主軸回動部の縦
断面図、第１０図は第５図中Ｃ−Ｃ線断面図、第１１図
は連動機構の説明図、第１２図は作動態様の説明図、第
１３図は作動時における扉支軸と扉の移動軌跡を示す説
明図である。 １．２：扉、３：枠体、３ａ：主枠、３ｂ：副枠、４：
扉支軸、４ａ：肉薄の軸部、５：扉支軸、６．７：支持
腕、８，９：主軸、１０，１１：軸受部材、１２：支軸
、１３：水平揺動杆、１３ａ：長孔、１４：回動規制板
、１４ａ：切込溝、。 １４ｂ：枠部、１４Ｃ：ばね受部、１５：ばね受部材、
１６：拡圧ばね、１７：主軸の回動機構、１８：主柱、
工９：開閉操作杆、２０：リンク、２１：連動機構、２
２．２３：リンク。Fig. 1 is a front view of the entire door device, Fig. 2 is a simplified central vertical sectional front view, Fig. 3 is an enlarged sectional view taken along line A-A in Fig. 2, and Fig. 4 is B in Fig. 3. -B enlarged sectional view, Fig. 5 is a partially enlarged front view of the door support shaft, Fig. 6 is a sectional view taken along line C-C in Fig. 5, Fig. 7 is a sectional view taken along line C-C in Fig. 5, Figure 8 is a cross-sectional view taken along line E-E)lii in Figure 4, Figure 9 is a vertical cross-sectional view of the main shaft rotating section, Figure 10 is a cross-sectional view taken along line C-C in Figure 5, and Figure 11 is the interlocking mechanism. FIG. 12 is an explanatory diagram of the operating state, and FIG. 13 is an explanatory diagram showing the movement locus of the door support shaft and the door during operation. 1.2: Door, 3: Frame, 3a: Main frame, 3b: Sub-frame, 4:
Door support shaft, 4a: thin shaft, 5: door support shaft, 6.7: support arm, 8, 9: main shaft, 10, 11: bearing member, 12: support shaft, 13: horizontal swinging rod, 13a : Long hole, 14: Rotation regulating plate, 14a: Cut groove. 14b: frame portion, 14C: spring receiving portion, 15: spring receiving member,
16: Expansion spring, 17: Main shaft rotation mechanism, 18: Main column,
Engineering 9: Opening/closing operation rod, 20: Link, 21: Interlocking mechanism, 2
2.23: Link.

Claims (1)

【特許請求の範囲】[Claims] 方形状の主枠と該主枠の上下に前後方向へ一体的に張り
出した副枠とによつて構成した枠体内に左右一対の扉を
配設し、該一対の扉の夫々の幅方向の中心部の上下に扉
支軸を突設すると共に該扉支軸の夫々を前記主枠の垂直
部内に回動自在に保持した主軸の上下端部から水平に張
り出した支持腕の先端部に回動自在に保持せしめ、他方
前記副枠内において、前記主軸及び扉支軸の軸心とそれ
自身の軸心とを線で結ぶと正三角形となる位置に垂直な
支軸を設け、該支軸をもつて、先端部から長さ方向の略
中央部にかけて前記上部側の扉支軸を摺動自在に嵌合す
る長孔を設けた水平揺動杆の基部を水平方向回動自在に
軸支し、更に先端部に該水平揺動杆の長孔に沿つた所要
幅の切込溝を設け、該切込溝内に前記上部側の扉支軸の
薄肉とした軸部を嵌入させた回動規制板に枠部を形成し
、該枠部に前記水平揺動杆を摺動自在に嵌合すると共に
、該回動規制板を拡圧ばねをもつて常時その先端部が前
記上部側の扉支軸に接触するよう附勢し、更に前記主枠
の上部側の水平部分内において、長さ方向の中心部を水
平方向回動自在に軸着したリンクと、該リンクの両側の
端部と前記左右の扉の夫々の上部側の扉支軸とを連結す
るリンクとをもつて左右の主軸を連動せしめ、更に該左
右の主軸を適宜の回動機構をもつて回動せしめるべくな
したドアー装置。A pair of left and right doors is disposed within a frame composed of a rectangular main frame and a sub-frame that integrally extends above and below the main frame in the front-rear direction, and the width direction of each of the pair of doors is Door support shafts are provided projecting above and below the center, and each of the door support shafts is rotated to the tip of a support arm that extends horizontally from the upper and lower ends of the main shaft rotatably held within the vertical part of the main frame. On the other hand, within the sub-frame, a vertical support shaft is provided at a position that forms an equilateral triangle when the axes of the main shaft and the door support shaft are connected with a line to the axis of the door support shaft itself, and the support shaft is The base of the horizontal swinging rod is pivotably supported in the horizontal direction, and the base of the horizontal swinging rod is provided with an elongated hole extending from the tip end to the approximately central portion in the longitudinal direction into which the upper door support shaft is slidably fitted. Furthermore, a cut groove of a required width is provided at the tip part along the long hole of the horizontal swinging rod, and a thin shaft part of the upper door support shaft is fitted into the cut groove. A frame portion is formed on the movement restriction plate, and the horizontal swinging rod is slidably fitted into the frame portion, and the rotation restriction plate is held with a pressure spring so that its tip end is always on the upper side. A link which is energized to contact the door support shaft and whose longitudinal center portion is rotatably pivoted in the horizontal direction within the upper horizontal portion of the main frame, and both ends of the link. and a link connecting the upper door support shafts of the left and right doors to interlock the left and right main shafts, and further rotate the left and right main shafts with an appropriate rotation mechanism. door device.