JPH02307485A - Fireproof damper device - Google Patents
Fireproof damper deviceInfo
- Publication number
- JPH02307485A JPH02307485A JP12850389A JP12850389A JPH02307485A JP H02307485 A JPH02307485 A JP H02307485A JP 12850389 A JP12850389 A JP 12850389A JP 12850389 A JP12850389 A JP 12850389A JP H02307485 A JPH02307485 A JP H02307485A
- Authority
- JP
- Japan
- Prior art keywords
- shutter plate
- temperature fuse
- damper device
- ventilation
- shutter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009423 ventilation Methods 0.000 claims description 45
- 239000002184 metal Substances 0.000 claims description 16
- 230000002265 prevention Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 5
- 210000000078 claw Anatomy 0.000 abstract description 6
- 239000013013 elastic material Substances 0.000 abstract description 2
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 229910000743 fusible alloy Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、防火ダンパー装置の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a fire damper device.
第７図は、例えば実開昭６３−５３３５号公報に示され
た従来の防火ダンパー装置を示す図であり、図において
（１）は内部に通風路（２）を設けた通風筒、（３）は
この通風筒の一端に装着されたグリル、（４）は上記通
風路（２）内にて支承部（（５）を介して設けられたシ
ャッタ板、（６）はこのシャッタ板の一端に間隔保持腕
■を介して装着された回動助成錘り、（８）は上記シャ
ッタ板の他端に一端が装着された温度ヒユーズで、他端
が通風筒（１）内壁に接続されている。（９）は上記通
風筒（１）内壁に設けられたシール板で、シャッタ板（
４）が当接される。FIG. 7 is a diagram showing a conventional fire prevention damper device disclosed in, for example, Japanese Utility Model Application Publication No. 63-5335. ) is a grill attached to one end of this ventilation pipe, (4) is a shutter plate provided through a support part ((5) in the ventilation passage (2), and (6) is one end of this shutter plate. A rotation assisting weight is attached to the spacer through the spacing arm ■, and (8) is a temperature fuse whose one end is attached to the other end of the shutter plate, and the other end is connected to the inner wall of the ventilation tube (1). (9) is a seal plate provided on the inner wall of the ventilation tube (1), and the shutter plate (
4) is brought into contact.
従来の防火ダンパー装置は上記のように構成され、通風
路（２）内の温度が上昇して温度ヒユーズ（８）が溶断
されると、シャッタ板（２）は間隔保持腕（７）の先端
に位置する回動助成錘り（６）により矢印α■方向へ回
動して通風路（２）が閉止状態に遮断される。The conventional fire damper device is configured as described above, and when the temperature inside the ventilation passage (2) rises and the temperature fuse (8) is blown, the shutter plate (2) is moved to the tip of the spacing arm (7). The rotation assisting weight (6) located at rotates in the direction of the arrow α■ to close the ventilation passage (2).
上記のような従来の防火ダンパー装置では、通風路（２
）の開放状態を保持するよう温度ヒユーズ（８１にてシ
ャッタ板（４）の一端を釣支しており、温度ヒユーズ（
５）にはシャッタ板（２）および回動助成錘り（６）の
重量が加わり、ひねり荷重、クリープ等の耐力の大きい
温度ヒユーズ（８）が必要とされ、温度ヒユーズ（８）
が大きく、製作コストが高くなるという課題があった。In the conventional fire damper device as described above, the ventilation path (2
One end of the shutter plate (4) is supported by the temperature fuse (81) to maintain the open state of the temperature fuse (
The weight of the shutter plate (2) and the rotation assisting weight (6) is added to 5), and a temperature fuse (8) with high resistance to twisting loads, creep, etc. is required.
However, there was a problem in that it was large and the production cost was high.
この発明は係る課題を解決するためになされたもので、
シャッタ板および回動助成錘りの荷重を受けることなく
、小型で安価な温度ヒユーズにて対応ができる防火ダン
パー装置を得ることを目的とする。This invention was made to solve the problem,
To obtain a fire prevention damper device which can be handled by a small and inexpensive temperature fuse without being subjected to the load of a shutter plate and a rotation assisting weight.
〔課題を解決するための手段〕
この発明に係る防火ダンパー装置は、付設の温度ヒユー
ズの溶断時に回動して通風筒の通風路を開放状態から閉
止状態に遮断するシャッタ板を備えたものにおいて、上
記シャッタ板を上記通風路にて支承し観音開きにより回
動するよう複数枚にて形成し、上記通風筒端部にシャッ
タ板の外周を上記通風路の開放時に挟持して一端に弾性
部材、他端に温度ヒユーズを有する金具を設けたもので
ある。[Means for Solving the Problems] A fire prevention damper device according to the present invention includes a shutter plate that rotates when an attached temperature fuse is fused to shut off the ventilation path of the ventilation pipe from an open state to a closed state. , a plurality of shutter plates are formed to support the shutter plate in the ventilation passage and rotate in a double-opening manner, the outer periphery of the shutter plate is held at the end of the ventilation tube when the ventilation passage is opened, and an elastic member is attached to one end; A metal fitting with a temperature fuse is provided at the other end.
また、シャッタ板の支承部に他方のシャ・ツタ板と重合
する密封板を設けたものである。Further, a sealing plate is provided on the support portion of the shutter plate and overlaps with the other shutter plate.
また、シャッタ板に取っ手を設けたものである。Additionally, a handle is provided on the shutter plate.
また、温度ヒユーズを屋外側に位置する通風筒端部に配
設したものである。Additionally, a temperature fuse is placed at the end of the ventilation tube located on the outdoor side.
この発明においては、シャッタ板を上記通風路にて支承
し観音開きにより回動するよう複数枚にて形成し、上記
通風筒端部にシャッタ板の外周を通風路の開放時に挟持
して一端に弾性部材、多端に温度ヒユーズを有する金具
を設けたことにより、シャッタ板は通風路開放時に金具
により挟持され、温度ヒユーズが溶断されることにより
通風路を閉止状態にする。In this invention, the shutter plate is formed of a plurality of plates so as to be supported in the ventilation passage and rotated by double opening, and the outer circumference of the shutter plate is held at the end of the ventilation tube when the ventilation passage is opened, and one end is made of elastic material. By providing a metal fitting having a temperature fuse at one end of the member, the shutter plate is held between the metal fittings when the ventilation path is opened, and the temperature fuse is fused to close the ventilation path.
第１図（ａ）、（ｂ）〜第５図はこの発明の一実施例を
示す図であり、図において（１１）は通風筒で、内部に
通風路（１２）を設は一端に取付用フランジ（１３）を
有する。 （１４）はこのフランジに設けられた複数の
取付穴、（１５）はこの取付穴近傍に設けられた引っ掛
は金具、（１６）は上記通風筒（１１）外壁に設けられ
たウェザ−カバー取付用脚で、先端にネジ穴（１７）が
設けられている。（１８）はシャッタ部で、半円形から
なる２枚のシャッタ板（１９）が円を形成するよう対向
され、それぞれボール（２０）にて端部が回動自在に支
承された支承部（２０ａ）にて観音開き状に開閉され、
このシャッタ板は上記ボール（２０）に挿通された例え
ばコイルバネからなるバネ（２１）およびこのバネの先
端に設けられた止め棒（２１ａ）にて押圧され、たえず
シャッタ板（１９）が閉状態に規制されている。 （２
２）は上記通風筒（１１）の側壁に設けられたシャッタ
止め部で、対向する２カ所をネジ（２３）に上記ボール
（２０）の両端部を固定している。（２４）は上記シャ
ッタ板（１９）が閉状にて互いに重合された端部を挟持
する金具で、略コ字状に形成された挟持部（２５）と両
端部が対向するように折曲された引っ掛は爪（２６）と
が設けられている。（２７）はこの金具の一方の引っ掛
は爪（２６）に係合された弾性部で、例えばコイルバネ
よりなり、金具（２４）および後述される温度ヒユーズ
を張架するものである。 （２８）は上記金具〈２４）
の他方の引っ掛は爪（２６）に係合された温度ヒユーズ
で、例えば低溶融合金よりなるヒユーズ（半田）によっ
て爪（２９）が互いに接合されてなり、所定温度にて溶
断され、上記通風筒（１１）の端部である屋外側に配設
される。Figures 1 (a), (b) to 5 are diagrams showing one embodiment of the present invention. In the figures, (11) is a ventilation tube, and a ventilation passage (12) is provided inside, and the tube is attached to one end. flange (13). (14) is a plurality of mounting holes provided on this flange, (15) is a metal fitting provided near the mounting hole, and (16) is a weather cover provided on the outer wall of the ventilation pipe (11). The mounting legs are provided with screw holes (17) at their tips. (18) is a shutter part, in which two semicircular shutter plates (19) face each other to form a circle, and each end is rotatably supported by a ball (20) at a support part (20a). ) is opened and closed in a double-door shape,
This shutter plate is pressed by a spring (21), for example, a coil spring, which is inserted into the ball (20) and a stop bar (21a) provided at the tip of this spring, so that the shutter plate (19) is constantly kept in the closed state. regulated. (2
2) is a shutter stopper provided on the side wall of the ventilation tube (11), and both ends of the ball (20) are fixed to screws (23) at two opposing locations. (24) is a metal fitting that holds the ends of the shutter plate (19) overlapped with each other in a closed state, and is bent so that both ends face a holding part (25) formed in a substantially U-shape. The hook is provided with a claw (26). One hook (27) of this metal fitting is an elastic part that is engaged with a claw (26), and is made of, for example, a coil spring, and is used to tension the metal fitting (24) and a temperature fuse to be described later. (28) is the above metal fittings (24)
The other hook is a temperature fuse engaged with the claw (26), and the claws (29) are joined to each other by a fuse (solder) made of, for example, a low-melting alloy, which is fused at a predetermined temperature, and the above-mentioned ventilation It is arranged on the outdoor side, which is the end of the tube (11).
（３０）はこの温度ヒユーズおよび上記弾性部材（２７
）が係止される止めど−ス、（３１）は上記シャッタ板
（１９）に設けられた取っ手、（３２）は同じく上記シ
ャッタ板（１９）の支承部（２０ａ）に設けられた密封
板で、他のシャッタ板（１９）と重合し隙間を封じ風も
れを防ぐ。（３３）は上記通風筒（１１）内壁に設けら
れたパツキンで、例えば合成樹脂よりなる。（３４）は
ウェザ−カバーで、上記取付用脚（１６）のネジ穴（１
７）と対向する止め穴（３５）を有する。（３６）はド
ライバーである。(30) represents this temperature fuse and the elastic member (27).
) is locked, (31) is a handle provided on the shutter plate (19), and (32) is a sealing plate also provided on the support portion (20a) of the shutter plate (19). , overlaps with other shutter plates (19) to seal the gap and prevent wind leakage. (33) is a gasket provided on the inner wall of the ventilation tube (11), and is made of, for example, synthetic resin. (34) is a weather cover, which has screw holes (1) on the mounting legs (16).
7) and a stopper hole (35) facing thereto. (36) is a driver.
上記のように構成された防火ダンパー装置では、ボール
（２０）にシャッタ板（１９）、バネ（２１）が挿通さ
れ、シャッタ部（１８）が形成され、通風筒（１１）の
シャッタ止め部（２２）にネジ（２３）により固定され
る。In the fire damper device configured as described above, the shutter plate (19) and the spring (21) are inserted through the ball (20) to form the shutter portion (18), and the shutter stop portion ( 22) with screws (23).
次に、止めピース（３０）に金具（２４）を中央にして
弾性部材（２７）および温度ヒユーズ（２８）が係止さ
れ、上記金具（２４）の挟持部（２５）にシャッタ板（
１９）がそれぞれ重合されるようにして端部が収納され
て、通風路（１２）が開放状態になる。さらに、フラン
ジ（１３）の取付穴（１４）により図示されない壁面に
通風筒（１１）が装着され、ウェザ−カバー（３４）が
その端部を引っ掛は金具（１５）に係止させ、取付用脚
（１６）および止め穴（３５）によりネジ（２３）にて
取着される。Next, the elastic member (27) and the temperature fuse (28) are locked to the stopper piece (30) with the metal fitting (24) in the center, and the shutter plate (
19) are respectively superposed so that the ends are stored, and the ventilation passage (12) is in an open state. Further, the ventilation tube (11) is attached to a wall surface (not shown) through the attachment hole (14) of the flange (13), and the weather cover (34) hooks the end of the tube to the metal fitting (15) to attach it. It is attached with screws (23) through the legs (16) and the fixing holes (35).
そして、火災が発生して通風路（１２）内の温度が上昇
すると温度ヒユーズ（２８）が溶融され、金具（２４）
が弾性部材（２７）により引っ張られ、引っ掛は爪（２
６）を先頭にして弾性部材（２７）であるコイルバネ内
部へ金具（２４）が挿入されるとともに、シャッタ板（
１９）がフランジ（１３）側へ回動され、通風路（１２
）を閉止状態にして遮断され、災害が他へおよぶのが阻
止される。一方、シャッタ板（１９）の復帰には第４図
および第５図に示すようにドライバー（３６）にて取っ
手（３１）を引く、あるいは支承部（２０ａ）を押圧す
ることにてできる。このように金具（２４）にてシャッ
タ板（１９）を挟持して通風路（１２）を開放状態にす
ることで、従来のような温度ヒユーズにてシャッタ板（
１９）を保持することがなく、温度ヒユーズ（２８）に
ひねり荷重、クリープ等の耐力が必要なく、簡単な構造
からなる小型の温度ヒユーズ（２８）にて対応が可とな
り、温度ヒユーズ（２８）が安価にできる。When a fire occurs and the temperature inside the ventilation passage (12) rises, the temperature fuse (28) melts and the metal fitting (24)
is pulled by the elastic member (27), and the hook is pulled by the claw (2
The metal fitting (24) is inserted into the coil spring which is the elastic member (27) with 6) at the top, and the shutter plate (24) is inserted into the coil spring which is the elastic member (27).
19) is rotated toward the flange (13), and the ventilation passage (12) is rotated toward the flange (13).
) is closed and shut off, preventing disasters from spreading to other areas. On the other hand, the shutter plate (19) can be returned to its original position by pulling the handle (31) with a screwdriver (36) or by pressing the support portion (20a), as shown in FIGS. 4 and 5. By holding the shutter plate (19) between the metal fittings (24) and opening the ventilation path (12) in this way, the shutter plate (19) can be opened using the conventional temperature fuse.
19), the temperature fuse (28) does not need to withstand stress such as twisting load or creep, and can be handled by a small temperature fuse (28) with a simple structure. can be done inexpensively.
なお、この発明においては火災発生時の防火ダンパー装
置として述べたが、地震発生時においても震動により金
具（２４）の挟持部（２５）よりシャッタ板（１９）が
外れ、上記実施例と同様の効果が得られる。Although this invention has been described as a fire prevention damper device in the event of a fire outbreak, the shutter plate (19) may come off from the clamping portion (25) of the metal fitting (24) due to vibrations in the event of an earthquake, resulting in the same situation as in the above embodiment. Effects can be obtained.
また、第６図はこの発明の他の実施例で、二層パイプ（
３７）を通風筒（１１）内に挿入することにより、シャ
ッタ板（１９）の挟持部（２５）が二層バイブ（３７）
の仕切り部分と当接し、吸排気流が必要とされる場合に
おいても防火ダンパー装置として用いることができ、よ
り利用効率を高めることができる。FIG. 6 shows another embodiment of the present invention, which shows a double-layer pipe (
37) By inserting it into the ventilation tube (11), the clamping part (25) of the shutter plate (19) becomes the double-layered vibe (37)
It can be used as a fire prevention damper device even when intake and exhaust flow is required by contacting the partition part of the pipe, and the efficiency of use can be further increased.
この発明は、以上説明したように構成されているので、
次に記載する効果を奏する。Since this invention is configured as explained above,
This produces the following effects.
請求項（１）の防火ダンパー装置においては、付設の温
度ヒユーズの溶断時に回動して通風筒の通風路を開放状
態から閉止状態に遮断するシャッタ板を備えたものにお
いて、上記シャッタ板を上記通風路にて支承し観音開き
により回動するよう複数枚にて形成し、上記通風筒端部
にシャッタ板の外周を上記通風路の開放時に挟持して一
端に弾性部材、他端に温度ヒユーズを有する金具を設け
たことより、温度ヒユーズにてシャッタ板を保持するこ
とがなく、温度ヒユーズが強度および構造においても小
さいもので対応ができるので、温度ヒユーズを安価にで
きる。The fire prevention damper device according to claim (1) is provided with a shutter plate that rotates when an attached temperature fuse is fused to shut off the ventilation path of the ventilation tube from an open state to a closed state, wherein the shutter plate is A plurality of sheets are formed so as to be supported in the ventilation passage and rotated with double doors, and the outer periphery of the shutter plate is held at the end of the ventilation tube when the ventilation passage is opened, and an elastic member is attached to one end and a temperature fuse is attached to the other end. Since the shutter plate is not held by the temperature fuse, the temperature fuse can be made smaller in strength and structure, so the temperature fuse can be made cheaper.
請求項（２）の防火ダンパー装置においては、シャッタ
板の支承部に他方のシャッタ板と重合する密封板を設け
たことより、シャッタ板の閉止時において通風路の空気
ちれかなくなく、密閉性が向上される。In the fire prevention damper device according to claim (2), since the sealing plate that overlaps with the other shutter plate is provided on the support portion of the shutter plate, there is no air leakage in the ventilation path when the shutter plate is closed, and the air is sealed. performance is improved.
請求項（３）の防火ダンパー装置においては、シャッタ
板に取っ手を設けたことにより、シャッタ板の取り扱い
が簡単にできる。In the fire prevention damper device of claim (3), since the shutter plate is provided with a handle, the shutter plate can be easily handled.
請求項（社）の防火ダンパー装置においては、温度ヒユ
ーズを屋外側に位置する通風筒端部に配設したことより
、屋外側からの温度ヒユーズのメンテナンスが容易にな
る。In the fire prevention damper device according to the present invention, since the temperature fuse is disposed at the end of the ventilation tube located on the outdoor side, maintenance of the temperature fuse from the outdoor side is facilitated.
第１図（ａ）、（ｂ）はこの発明の一実施例を示す斜視
図および部分拡大図、第２図は同じくシャッタ部の正面
図、第３図は同じく取付斜視図、第４図（ｂ）は同じく
シャッタ部の開放復帰方法を示す斜視図、第４図＜ａ）
、（ｃ）は同じく第４図（ｂ）の部分拡大図、第５図（
ａ）は同じくシャッタ部の開放復帰方法番示す斜視図、
第５図（ｂ）は同じく第５図（ａ）の部分拡大図、第６
図は同じくこの発明の他の実施例を示す取付斜視図、第
７図は従来の防火ダンパー装置を示す断面図である。
なお、（１１）は通風筒、（１２）は通風路、（１９）
はシャッタ板、（２４）は金具、（２７）は弾性部材、
（２８）は温度ヒユーズ、（３１）は取っ手、（３２）
は密封板である。1(a) and 1(b) are a perspective view and a partially enlarged view showing an embodiment of the present invention, FIG. 2 is a front view of the shutter section, FIG. 3 is a perspective view of the installation, and FIG. b) is a perspective view showing the method of returning the shutter to open, and Fig. 4<a)
, (c) is also a partially enlarged view of Fig. 4 (b), and Fig. 5 (
a) is a perspective view showing the method for returning the shutter to open;
Figure 5(b) is also a partial enlarged view of Figure 5(a),
This figure is an installation perspective view showing another embodiment of the present invention, and FIG. 7 is a sectional view showing a conventional fire damper device. In addition, (11) is a ventilation tube, (12) is a ventilation passage, (19)
is a shutter plate, (24) is a metal fitting, (27) is an elastic member,
(28) is the temperature fuse, (31) is the handle, (32)
is a sealing plate.
Claims (4)
通風路を開放状態から閉止状態に遮断するシャッタ板を
備えたものにおいて、上記シャッタ板を上記通風路にて
支承し観音開きにより回動するよう複数枚にて形成し、
上記通風筒端部にシャッタ板の外周を上記通風路の開放
時に挟持して一端に弾性部材、他端に温度ヒューズを有
する金具を設けたことを特徴とする防火ダンパー装置。(1) In a device equipped with a shutter plate that rotates when an attached thermal fuse blows to shut off the ventilation path of the ventilation tube from an open state to a closed state, the shutter plate is supported by the ventilation path and rotated by double opening. Formed with multiple pieces so that it can move,
A fire prevention damper device characterized in that a metal fitting having an elastic member at one end and a thermal fuse at the other end is provided at the end of the ventilation tube to sandwich the outer periphery of the shutter plate when the ventilation passage is opened.
る密封板を設けたことを特徴とする特許請求の範囲第１
項記載の防火ダンパー装置。(2) Claim 1 characterized in that the supporting portion of the shutter plate is provided with a sealing plate that overlaps with the other shutter plate.
Fire damper device as described in Section 1.
許請求の範囲第２項記載の防火ダンパー装置。(3) The fire prevention damper device according to claim 2, characterized in that a handle is provided on the shutter plate.
設したことを特徴とする特許請求の範囲第１項記載の防
火ダンパー装置。(4) The fire prevention damper device according to claim 1, wherein the temperature fuse is disposed at the end of the ventilation tube located on the outdoor side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12850389A JPH02307485A (en) | 1989-05-22 | 1989-05-22 | Fireproof damper device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12850389A JPH02307485A (en) | 1989-05-22 | 1989-05-22 | Fireproof damper device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02307485A true JPH02307485A (en) | 1990-12-20 |
Family
ID=14986355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12850389A Pending JPH02307485A (en) | 1989-05-22 | 1989-05-22 | Fireproof damper device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02307485A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09285629A (en) * | 1996-02-21 | 1997-11-04 | Oizumi Corp | Cigarette butt collecting and smoke eliminating device for game parlor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027939B2 (en) * | 1977-05-06 | 1985-07-02 | 三菱電機株式会社 | Brazeability test method |
| JPS6030899B2 (en) * | 1978-02-15 | 1985-07-19 | 株式会社日立製作所 | Synthetic equivalent test device for breaker |
| JPS633851B2 (en) * | 1976-12-28 | 1988-01-26 | Engelhard Corp |
-
1989
- 1989-05-22 JP JP12850389A patent/JPH02307485A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS633851B2 (en) * | 1976-12-28 | 1988-01-26 | Engelhard Corp | |
| JPS6027939B2 (en) * | 1977-05-06 | 1985-07-02 | 三菱電機株式会社 | Brazeability test method |
| JPS6030899B2 (en) * | 1978-02-15 | 1985-07-19 | 株式会社日立製作所 | Synthetic equivalent test device for breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09285629A (en) * | 1996-02-21 | 1997-11-04 | Oizumi Corp | Cigarette butt collecting and smoke eliminating device for game parlor |
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