JP7724403B2 - Seal structure of rotating seal body of folding door - Google Patents

Seal structure of rotating seal body of folding door

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JP7724403B2
JP7724403B2 JP2021133119A JP2021133119A JP7724403B2 JP 7724403 B2 JP7724403 B2 JP 7724403B2 JP 2021133119 A JP2021133119 A JP 2021133119A JP 2021133119 A JP2021133119 A JP 2021133119A JP 7724403 B2 JP7724403 B2 JP 7724403B2
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seal body
folding door
rotary seal
airtight material
attached
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JP2023027822A (en
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友宏 野口
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Description

本発明は、折畳み扉が装着される枠体を構成する下桟上面をフラット面で形成した折畳み扉装置であって、下桟と折畳み扉との隙間をシールする回転シール体のシール構造に関するものである。 This invention relates to a folding door device in which the upper surface of the lower sash that forms the frame on which the folding door is mounted is formed as a flat surface, and to the sealing structure of a rotating seal body that seals the gap between the lower sash and the folding door.

間口を開閉する装置として複数枚の扉を連結して構成した折畳み扉が多用されている。 ところで、折畳み扉の扉継手部の中で、折畳み操作の際にレールから張り出さない継手部上端には吊車が取付けられて上桟のレールに吊設され、下端にはスライダーが突出して下桟に設けているガイド溝に沿って移動することが出来る。そして伸長して閉じた場合にはロック棒が突出してガイド溝へ嵌入し、折畳み扉が開かないようにロックされる。 Folding doors, made up of multiple connected panels, are widely used as devices for opening and closing doorways. A hoist is attached to the upper end of the door joint of a folding door, which does not protrude from the rail during folding, and is suspended from the rail on the upper rail. A slider protrudes from the lower end and can move along a guide groove in the lower rail. When the door is extended and closed, a locking rod protrudes and fits into the guide groove, locking the door from opening.

折畳み扉が装着される枠体の上下桟にはシール材を沿設したシール体が設けられ、閉じた折畳み扉の内面が該シール体に当接することが出来、シール材を介して気密性及び水密性が確保される構造と成っている。
その為に、下桟の上面はフラットでなく、内側(室内側)には上記シールが設けられて折畳み扉が当接することが出来るように成っている。これは、折畳み扉と下桟との気密性、水密性を保つ為に必要な形態として従来から採用されて来ている。
The upper and lower rails of the frame on which the folding door is attached are provided with a seal body with a sealing material along it, and the inner surface of the closed folding door can abut against the seal body, ensuring airtightness and watertightness through the sealing material.
For this reason, the top surface of the lower sash is not flat, and the seal is provided on the inside (inside the room) so that the folding door can abut against it. This has been adopted for some time as a necessary configuration to maintain airtightness and watertightness between the folding door and the lower sash.

ところで、近年ではバリアフリーと称されて床面に段差を設けることなく、車椅子が自由に動き易いようなフラット床面が普及している。例えば、部屋の床面とベランダ面とが同一であれば、車椅子が自由にベランダへ移動することが出来る。しかし、フラットな下桟にすればシール体が無くなってしまい、その結果、外から雨水が侵入すると共に外気との気密性が損なわれてしまうといった問題が生じる。 Incidentally, in recent years, flat floors that allow wheelchairs to move freely without any steps on the floor, known as barrier-free, have become popular. For example, if the floor of a room and the balcony surface are the same, a wheelchair can move freely onto the balcony. However, if the bottom rail is flat, there is no seal, which results in problems such as rainwater entering from outside and a loss of airtightness against the outside air.

そこで、フラットな床面であってもシールを取付けることが出来るように、回転シール体とし、折畳み扉が折畳まれた状態では回転シール体は倒れてフラットな床面なる。しかし、折畳み扉が伸長して間口が閉じられ、ロックするならば回転シール体は回転して起立し、折畳み扉の内面に当接することでシールされ、気密性及び水密性が確保されるように成っている。 So, to allow the seal to be installed even on a flat floor, a rotating seal body is used, and when the folding door is folded, the rotating seal body lies flat, creating a flat floor surface. However, when the folding door is extended to close the opening and lock it, the rotating seal body rotates and stands up, abutting against the inner surface of the folding door to form a seal and ensure airtight and watertight properties.

特開2006-37424号に係る「折畳み扉装置」は、枠体に装着された折畳み扉が伸長して間口を閉じた場合に、フラットな上面を形成した下桟との間をシールすることが出来る折畳み扉装置である。
そこで、下桟の上面をフラットにすると共に溝空間を連続して長手方向に設け、該溝空間には回転可能に取付けた回転シール体を収容し、そして折畳み扉に取付けたロック棒を降下した際にロック棒の降下と連動して上記回転シール体が回転・起立して折畳み扉の下框に当接することが出来る。
The "folding door device" disclosed in JP 2006-37424 A is a folding door device that can seal the gap between the folding door attached to the frame and the lower rail that forms a flat upper surface when the folding door is extended to close the opening.
Therefore, the upper surface of the lower rail is made flat and a continuous groove space is provided in the longitudinal direction, and a rotatably attached rotating seal body is accommodated in the groove space.When the locking rod attached to the folding door is lowered, the rotating seal body rotates and stands up in conjunction with the lowering of the locking rod, and can abut against the bottom frame of the folding door.

図7は回転シール体(イ)を下桟(ロ)に取付けている場合を示している。下桟(ロ)には軸(ハ)が設けられ、該軸(ハ)に回転シール体(イ)は軸支されている。同図はロック装置のロッド(ニ)が降下することで回転シール体(イ)が回転して起立している状態であり、縁に取付けたシール(ホ)は折畳み扉(ヘ)の内面に当接している。 Figure 7 shows the rotating seal body (A) attached to the lower crosspiece (B). A shaft (C) is attached to the lower crosspiece (B), and the rotating seal body (A) is supported on the shaft (C). The figure shows the rotating seal body (A) rotating upright as the rod (D) of the locking device descends, and the seal (E) attached to the edge abuts against the inner surface of the folding door (F).

回転シール体(イ)は押え片(ト)を有し、折畳み扉(ヘ)が折畳まれて間口が開いている場合には嵌入溝(チ)が閉じるように水平になっている。しかし、上記ロッド(ニ)が降下するならば、押え片(ト)は同図に示すように押圧されて倒され、同時に回転シール体(イ)は起立する。
したがって、上記回転シール体(イ)を介して、折畳み扉(ヘ)の気密性及び水密性は確保される。
The rotating seal (A) has a retaining piece (G) and is horizontal so that the insertion groove (H) is closed when the folding door (F) is folded and the opening is open. However, when the rod (D) descends, the retaining piece (G) is pressed down as shown in the figure and at the same time the rotating seal (A) stands up.
Therefore, the airtightness and watertightness of the folding door (F) are ensured via the rotary seal body (A).

ところで、最近では大雨が多発し、スコールのような大雨時には折畳み扉(ヘ)の外表面に雨が叩きつけられ、起立した回転シール体(イ)のシール(ホ)を通過して折畳み扉(ヘ)の内側へ浸入する。特に、回転シール体(イ)の全長が長い場合には、該回転シール体(イ)が捩れることで、端部側では起立した回転シール体(イ)のシール(ホ)と折畳み扉(ヘ)との間に隙間が発生し、下桟(ロ)に当たった雨水が弾いて該隙間から浸入する。
特開2006-37424号に係る「折畳み扉装置」
Recently, heavy rains have become more frequent, and during heavy rains such as squalls, rain slams against the outer surface of the folding door (F), passes through the seal (E) of the standing rotating seal body (A), and seeps into the inside of the folding door (F). In particular, when the overall length of the rotating seal body (A) is long, the rotating seal body (A) twists, creating a gap between the seal (E) of the standing rotating seal body (A) and the folding door (F) at the end, and rainwater hitting the bottom sash (B) bounces off and seeps in through the gap.
"Folding door device" according to Japanese Patent Application Laid-Open No. 2006-37424

このように、折畳み扉に備わっている回転シール体には上記のような問題が残されている。
本発明が解決しようとする課題はこの問題点であり、スコールのような激しい雨が降っても、回転シール体を通過して雨水が内側に浸入しないように構成した回転シール体のシール構造を提供する。
As described above, the rotary seal member provided on the folding door still has the above-mentioned problems.
The problem that the present invention aims to solve is this problem, and provides a seal structure for a rotary seal body that is configured so that rainwater does not pass through the rotary seal body and penetrate inside even during heavy rain such as a squall.

本発明の折畳み扉装置は、下桟に回転シール体を備え、該回転シール体が回転して起立することで折畳み扉との間をシールすることが出来るように構成している。したがって、基本的な構造は前記特開2006-37424号に係る「折畳み扉装置」と同じである。
本発明はこの折畳み扉装置の回転シール体のシール機能を向上させたものであり、折畳み扉の内側に雨水が浸入しない構造としている。
The folding door device of the present invention is equipped with a rotary seal body on the lower rail, and is configured so that the rotary seal body rotates and stands up to seal the gap with the folding door. Therefore, the basic structure is the same as the "folding door device" according to the above-mentioned JP 2006-37424 A.
The present invention improves the sealing function of the rotary seal of this folding door device, and provides a structure that prevents rainwater from entering the inside of the folding door.

回転シール体には軸受けを形成し、下桟には軸を設けている。回転シール体は所定の断面を有す長尺材であり、軸受けを中心として反対側には押え片を設けている。そして、回転シール体の一方側縁には気密材(シール)を取付け、他方側縁にも気密材(シール)を設けている。これら気密材は回転シール体に沿って延び、該回転シール体が回転して起立するならば、上記一方側縁の気密材は折畳み扉の表面に当接し、他方側縁の気密材は下桟に当接することが出来る。 A bearing is formed on the rotating seal body, and a shaft is attached to the lower rail. The rotating seal body is a long material with a specified cross-section, and a pressing piece is attached to the opposite side of the bearing. An airtight material (seal) is attached to one side edge of the rotating seal body, and another airtight material (seal) is also attached to the other side edge. These airtight materials extend along the rotating seal body, and when the rotating seal body rotates and stands up, the airtight material on one side edge can abut against the surface of the folding door, and the airtight material on the other side edge can abut against the lower rail.

ところで、本発明は折畳み扉の表面に当接する上記一方側縁に設けた気密材に特徴を有している。
(1)上記気密材を所定の間隔をおいて複数本を設けることで、気密機能を向上している。
(2)上記気密材に水返しが出来るような断面形状としている。すなわち、気密材は1本であるが、折畳み扉表面に接する弾性片を複数本形成し、上端の弾性片まで雨水が届かない形状を有している。
(3)上記気密材を取付けている回転シール体に突片を延ばし、該気密材に雨水が届かないように該突片を水返しとして機能する。
The present invention is characterized by the airtight material provided on the one side edge that abuts against the surface of the folding door.
(1) By providing a plurality of the airtight materials at predetermined intervals, the airtight function is improved.
(2) The cross-sectional shape of the airtight material allows water to be returned to the airtight material. That is, although there is only one airtight material, multiple elastic pieces are formed in contact with the surface of the folding door, and the shape is such that rainwater does not reach the elastic piece at the top end.
(3) A protruding piece is extended from the rotary seal body to which the airtight material is attached, and the protruding piece functions as a water return so that rainwater does not reach the airtight material.

本発明の折畳み扉装置では、その回転シール体は長手方向に延び、同じく押え片も延びて嵌入溝に嵌っている。ロッドは張り出し継手部が位置する箇所に設けられているが、該ロッドが降下するならば押え片は押圧されて回転し、同時に回転シール体は回転して起立し、一方側縁に取付けている気密材は折畳み扉の表面に当接することが出来る。 In the folding door device of the present invention, the rotary seal extends longitudinally, and the retaining piece also extends and fits into the fitting groove. The rod is installed at the location where the protruding joint is located, and when the rod descends, the retaining piece is pressed and rotates, and at the same time the rotary seal rotates and stands up, allowing the airtight material attached to one side edge to abut against the surface of the folding door.

したがって、雨水は該気密材によって遮断されて折畳み扉の内側へ浸入することはない。しかも、本発明では上記回転シール体には、複数本の気密材を設けることで、回転シール体が長くなって先端部が捩れても、全ての気密材が折畳み扉面との間に隙間が生じることはない。
また、1本の気密材であっても、折畳み扉面に接する弾性片を複数本とすることで、最後の弾性片まで雨水が届くことはなく、水返しされる。
一方、回転シール体に突片を延ばすことで、水返しとして機能することが出来、気密材の弾性片と共に、気密性及び水密性の効果は向上する。
Therefore, rainwater is blocked by the airtight material and does not penetrate inside the folding door. Moreover, in the present invention, by providing multiple airtight materials on the rotary seal body, even if the rotary seal body becomes long and the tip is twisted, no gaps will occur between all of the airtight materials and the folding door surface.
Furthermore, even if there is only one piece of airtight material, by providing multiple elastic pieces in contact with the folding door surface, rainwater will not reach the last elastic piece and will be returned.
On the other hand, by extending the protruding pieces from the rotary seal body, it can function as a water return, and together with the elastic pieces of the airtight material, the effects of airtightness and watertightness are improved.

本発明に係る回転シール体のシール構造を示す実施例。1 is an embodiment showing the seal structure of a rotary seal body according to the present invention. 回転シール体に取付けられる気密材の具体例。Specific examples of airtight materials attached to the rotary seal body. 本発明に係る回転シール体のシール構造を示す他の実施例。10 is a diagram showing another embodiment of the seal structure of a rotary seal body according to the present invention. 回転シール体に取付けられる気密材の具体例。Specific examples of airtight materials attached to the rotary seal body. 本発明に係る回転シール体のシール構造を示す別の実施例。10 is a diagram showing another embodiment of the seal structure of a rotary seal body according to the present invention. 突片を設けている回転シール体の具体例。10 is a specific example of a rotary seal body provided with protruding pieces. 折畳み扉装置に取付けた回転シール体。A rotating seal body attached to a folding door device.

図1は本発明に係る回転シール体のシール構造を示す具体例であり、断面図を表している。同図において、1は回転シール体、2は下桟、3は折畳み扉、4はロッド、5は一方の気密材、6は他方の気密材を夫々表している。
同図は上記ロッド4が降下して嵌入溝7に嵌り、その為にロッド4に押し下げられて押え片8は回転し、その為に回転シール体1は起立する。一方側縁に取付けられている上記気密材5,6は折畳み扉表面に当接している。
Fig. 1 shows a cross-sectional view of a specific example of the seal structure of a rotary seal body according to the present invention, in which 1 represents the rotary seal body, 2 represents the lower rail, 3 represents the folding door, 4 represents the rod, 5 represents one airtight material, and 6 represents the other airtight material.
In the figure, the rod 4 descends and fits into the fitting groove 7, so that the rod 4 pushes down the pressing piece 8, causing it to rotate, and thus the rotary seal body 1 stands up. On the other hand, the airtight materials 5 and 6 attached to the side edges abut against the surface of the folding door.

そして、他方の側縁に取付けられている気密材9は、回転シール体1が起立した時に収容される収容溝10の上端に当接する
折畳み扉3を折畳む為にロッド4が上昇するならば、起立している回転シール体1は倒れて収容溝10に収容され、押え片8は嵌入溝7の上端入口を閉じることになる。
The airtight material 9 attached to the other side edge abuts against the upper end of the accommodation groove 10 in which the rotary seal body 1 is accommodated when it is erected .
When the rod 4 is raised to fold the folding door 3, the standing rotary seal body 1 falls down and is accommodated in the accommodation groove 10, and the pressing piece 8 closes the upper end entrance of the insertion groove 7.

上記気密材5は回転シール体1の縁に取付けられ、同じく気密材6も回転シール体1の縁に取付けられている。該気密材5は回転シール体1の外周側に取付けられ、気密材6は回転シール体1の軸側に取付けられている。
したがって、回転シール体1が起立するならば、気密材5は上方に位置し、気密材6は下方に位置している。
The airtight material 5 is attached to the edge of the rotary seal body 1, and similarly, the airtight material 6 is attached to the edge of the rotary seal body 1. The airtight material 5 is attached to the outer periphery of the rotary seal body 1, and the airtight material 6 is attached to the shaft side of the rotary seal body 1.
Therefore, when the rotary seal body 1 stands upright, the airtight material 5 is located at the top and the airtight material 6 is located at the bottom.

気密材5、6は弾性変形して折畳み扉3の表面に接することが出来るようにゴム質で構成され、該気密材5,6は取付け部11と弾性片12を有している。
該取付け部11は回転シール体1に設けた凹部に嵌り、弾性片12は取付け部11から湾曲して延びている。回転シール体1が回転して起立するならば、弾性片12は折畳み扉3の表面に隙間なく当接して撓むことが出来る。
The airtight materials 5 and 6 are made of rubber so that they can be elastically deformed to come into contact with the surface of the folding door 3, and the airtight materials 5 and 6 have an attachment portion 11 and an elastic piece 12.
The mounting portion 11 fits into a recess provided in the rotary seal body 1, and the elastic piece 12 curves and extends from the mounting portion 11. When the rotary seal body 1 rotates and stands up, the elastic piece 12 can bend and come into contact with the surface of the folding door 3 without any gaps.

図1に示しているように、2本の気密材5,6は所定の間隔をおいて平行に取付けられ、その為に、各気密材5,6の先端部に形成した各弾性片12,12は折畳み扉3の所定の表面に接している。このように、2重構造とすることで、折畳み扉3の外表面にたたきつけられた雨水は気密材5,6の各弾性片12,12を浸透して回転シール体1の内側へ浸入することはない。 As shown in Figure 1, the two airtight materials 5, 6 are attached parallel to each other at a predetermined distance, so that the elastic pieces 12, 12 formed at the tip of each airtight material 5, 6 come into contact with a predetermined surface of the folding door 3. This double structure prevents rainwater hitting the outer surface of the folding door 3 from penetrating the elastic pieces 12, 12 of the airtight materials 5, 6 and entering the inside of the rotating seal body 1.

仮に、回転シール体1が長くなって先端部が捩れ変形した場合であっても、弾性片12,12は少なくとも一方は表面に接して隙間の発生を抑えることが出来る。
図2はゴム質5,6を単独で表わしている具体例である。ここで、気密材5,6はゴム質で構成されるが、両弾性片12,12は同じゴム質でもよいが、柔らかさを違わせたゴム質を用いる場合もあり、また、その形状、例えば弾性片12,12の長さを違わせることも可能である。
Even if the rotary seal body 1 becomes long and the tip end is twisted and deformed, at least one of the elastic pieces 12, 12 will contact the surface, preventing the occurrence of a gap.
2 is a specific example showing only the rubber materials 5 and 6. Here, the airtight materials 5 and 6 are made of rubber, and both elastic pieces 12 and 12 may be made of the same rubber material, but rubber materials of different softness may also be used, and the shapes, for example, the lengths of the elastic pieces 12 and 12, may also be different.

図3は本発明に係る回転シール体1のシール構造を示す他の具体例である。図1に示しているように、回転シール体1は押え片8にロッド4が降下して押し下げることで起立し、一方側縁に取付けた気密材13は折畳み扉3の表面に当接している。
図4は上記気密材13を単独で表している。気密材13は取付け部11と該取付け部11から分離して延びる2本の弾性片14,14を有している。該気密材13には2本の弾性片14,14が所定の間隔をおいて設けられていることで、折畳み扉3の表面には2本の各弾性片14,14が当接することになり、気密性は大きく向上する。下側に位置する弾性片14は水返しとして機能する。

3 is another example of the sealing structure of the rotary seal body 1 according to the present invention. As shown in Fig. 1, the rotary seal body 1 stands up when the rod 4 descends and presses down on the pressing piece 8, and the airtight material 13 attached to one side edge abuts against the surface of the folding door 3.
4 shows the airtight material 13 alone. The airtight material 13 has an attachment portion 11 and two elastic pieces 14, 14 that extend separately from the attachment portion 11. The two elastic pieces 14, 14 are provided on the airtight material 13 at a predetermined interval, so that each of the two elastic pieces 14, 14 abuts against the surface of the folding door 3, greatly improving airtightness. The lower elastic piece 14 functions as a water return.

図5は本発明に係る回転シール体1のシール構造を示す別の具体例である。回転シール体1の一方側縁には気密材15が取付けられ、該気密材15から延びる弾性片16は折畳み扉3の表面に接している。
そして、回転シール体1の側面から突片17が延び、該突片17はゴム質ではなくアルミ製とし、回転シール体1の一部として成形されている。
該突片17が側面から延びることで、激しい豪雨時に下桟2に打ちつけられる雨水が飛び散り、回転シール体1当たる場合、雨水は突片17にて遮られる。すなわち、水返しとして機能する。
5 is another example showing the seal structure of the rotary seal body 1 according to the present invention. An airtight material 15 is attached to one side edge of the rotary seal body 1, and an elastic piece 16 extending from the airtight material 15 contacts the surface of the folding door 3.
A protruding piece 17 extends from the side of the rotary seal body 1, and the protruding piece 17 is made of aluminum rather than rubber and is molded as a part of the rotary seal body 1.
The protruding pieces 17 extend from the side surfaces, so that when rainwater splashes against the lower rail 2 during heavy rain and hits the rotating seal body 1, the rainwater is blocked by the protruding pieces 17. In other words, the protruding pieces 17 function as a water return.

図6は上記突片17を設けている回転シール体1を単独で表している具体例である。該突片17は回転シール体1の側辺から延び、雨水が気密材15に浸入しないように機能することが出来る。ここで、該突片17の突出長さは限定しない。 Figure 6 is a specific example showing the rotary seal body 1 alone, equipped with the protruding piece 17. The protruding piece 17 extends from the side of the rotary seal body 1 and can function to prevent rainwater from penetrating the airtight material 15. Here, the protruding length of the protruding piece 17 is not limited.

1 回転シール体
2 下桟
3 折畳み扉
4 ロッド
5 気密材
6 気密材
7 嵌入溝
8 押え片
9 気密材
10 収容溝
11 取付け部
12 弾性片
13 気密材
14 弾性片
15 気密材
16 弾性片
17 突片

REFERENCE SIGNS LIST 1 Rotating seal body 2 Lower rail 3 Folding door 4 Rod 5 Airtight material 6 Airtight material 7 Insertion groove 8 Pressing piece 9 Airtight material
10 Receiving groove
11 Mounting part
12 Elastic piece
13 Airtight materials
14 Elastic piece
15 Airtight materials
16 Elastic piece
17 Protrusion

Claims (1)

枠体に折畳み扉を装着し、下桟の上面をフラットにすると共に収容溝を連続して長手方向に設け、該収容溝には回転可能に取付けた回転シール体を収容し、ロックする為のロッドが降下することで上記回転シール体が回転して起立し、上記折畳み扉の表面に当接してシールすることが出来るようにした折畳み扉装置の回転シール体のシール構造において、上記回転シール体の一方側縁には気密材を取付け、回転シール体が回転して起立した場合には上記気密材の弾性片の先端が折畳み扉の表面に当接するようにし、該気密材より軸側にアルミ製の突片を延ばし、下桟に降り注いだ雨水が飛び散って気密材に届かないように阻止したことを特徴とする折畳み扉の回転シール体のシール構造。
The sealing structure of a rotary seal body for a folding door device has a folding door attached to a frame body, the upper surface of the lower sash is flat, and a continuous storage groove is provided in the longitudinal direction, a rotatably attached rotary seal body is stored in the storage groove, and when a locking rod is lowered, the rotary seal body rotates and stands up, so that it can abut against the surface of the folding door to seal.In this sealing structure of a rotary seal body for a folding door device, an airtight material is attached to one side edge of the rotary seal body, so that when the rotary seal body rotates and stands up, the tip of the elastic piece of the airtight material abuts against the surface of the folding door , and an aluminum protrusion extends toward the axis of the airtight material to prevent rainwater falling on the lower sash from splashing and reaching the airtight material.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005139629A (en) 2003-11-04 2005-06-02 Tostem Corp Opening-out door device
JP2006118196A (en) 2004-10-21 2006-05-11 Shin Nikkei Co Ltd Folding door device
JP2006188908A (en) 2005-01-07 2006-07-20 Shin Nikkei Co Ltd Lower frame structure of door frame in folding door device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5629517Y2 (en) * 1976-12-28 1981-07-14

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005139629A (en) 2003-11-04 2005-06-02 Tostem Corp Opening-out door device
JP2006118196A (en) 2004-10-21 2006-05-11 Shin Nikkei Co Ltd Folding door device
JP2006188908A (en) 2005-01-07 2006-07-20 Shin Nikkei Co Ltd Lower frame structure of door frame in folding door device

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