JPH0716145Y2 - Ball valve - Google Patents
Ball valveInfo
- Publication number
- JPH0716145Y2 JPH0716145Y2 JP1987200204U JP20020487U JPH0716145Y2 JP H0716145 Y2 JPH0716145 Y2 JP H0716145Y2 JP 1987200204 U JP1987200204 U JP 1987200204U JP 20020487 U JP20020487 U JP 20020487U JP H0716145 Y2 JPH0716145 Y2 JP H0716145Y2
- Authority
- JP
- Japan
- Prior art keywords
- ball
- port
- valve body
- water supply
- drainage port
- 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.)
- Expired - Lifetime
Links
Landscapes
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Taps Or Cocks (AREA)
- Details Of Valves (AREA)
- Multiple-Way Valves (AREA)
Description
【考案の詳細な説明】 (産業上の利用分野) この考案は、主として山林火災の消火に用いられるホー
スの先端部近くに介挿して利用されるボール弁で、消化
放水と共に残火処理放水が行えるボール弁に関するもの
である。[Detailed Description of the Invention] (Industrial field of application) The present invention is a ball valve that is used by being inserted near the tip of a hose mainly used for extinguishing forest fires. The present invention relates to a ball valve that can be used.
(従来の技術) この種の従来のボール弁においては、ボール状弁体に、
該ボール状弁体の90度に亘角度範囲内での回転操作によ
り上記給水口部と排水口部とを連通または連通遮断する
ような通水路を形成して構成されていた。(Prior Art) In this type of conventional ball valve,
The ball-shaped valve body is constituted by forming a water passage that connects or disconnects the water supply port and the drainage port by rotating the ball-shaped valve body within an angle range of 90 degrees.
(考案が解決しようとする問題点) 上記のような構造の従来のボール弁においては、例えば
これを消火用ホースの如き高速高圧ホースの途中に介挿
して使用する場合、送水状態から急に閉弁した際、ウォ
ーターハンマー現象によってホース破裂などの損傷を招
き易く、消火活動等といった送水本来の機能を阻害する
欠点があった。(Problems to be solved by the invention) In the conventional ball valve having the above-mentioned structure, when the ball valve is used by being inserted in the middle of a high-speed high-pressure hose such as a fire-extinguishing hose, the water-supply state is suddenly closed. When the valve was opened, it was liable to cause damage such as hose rupture due to the water hammer phenomenon, which had the drawback of impairing the original function of water supply such as fire fighting activities.
また、従来のボール弁では一方向のみの給水が行えるも
のであって、例えば消化活動において重要な残火処理用
の放水を行うためには該ボール弁を介挿したメインの消
火用ホースとは別個に残火処理用の長いホースを準備し
なければならないといった不便があった。Further, the conventional ball valve is capable of supplying water in only one direction, and for example, in order to discharge water for afterglow treatment, which is important in extinguishing activity, the main fire extinguishing hose with the ball valve inserted is There was the inconvenience of having to separately prepare a long hose for the afterglow treatment.
この考案は以上の実情に鑑みてなされたもので、ウォー
ターハンマー現象による接続ホースの損傷防止が図り得
るとともに、残火処理用放水などの分水が容易なボール
弁を提供することを特徴とする。The present invention has been made in view of the above circumstances, and is characterized by providing a ball valve capable of preventing damage to a connection hose due to a water hammer phenomenon and easily dividing water such as afterglow treatment. .
(問題点を解決するための手段) 上記の目的を達成するためになされたこの考案に係るボ
ール弁は、両側部に給水口部と排水口部とを同軸上に設
けている弁本体と、この弁本体内に上記給水口部および
排水口部の軸心に対して直交する軸心の周りに回転可能
に嵌合保持されたボール状弁体と、このボール状弁体を
上記軸心周りに90度の回転角度範囲で回転操作するレバ
ーとを備えたボール弁において、上記弁本体の周壁部
に、上記給水口部および排水口部の軸心に対して直角の
軸心をもち、かつ上記給水口部および排水口部よりも小
径の分岐排水口部を設ける一方、上記ボール状弁体に上
記給水口部と排水口部間を連通させかつ給水口部側の開
口部を該給水口部から上記分岐排水口部に亘って連通さ
せる大径の開口部に形成してなる通水路を設け、さら
に、分岐排水口部に対向したボール状弁体の周壁部を該
ボール状弁体が90度回転した際に上記排水口部を閉止す
る大形弁部に形成すると共に分岐排水口部側のボール状
弁体の周壁部に該ボール状弁体が90度回転するまでの間
に分岐排水口部を閉止する小形の弁部を形成しているこ
とを特徴とする。(Means for Solving the Problems) A ball valve according to the present invention made in order to achieve the above object is a valve main body having a water supply port and a drain port coaxially provided on both sides, A ball-shaped valve body fitted and held in the valve body so as to be rotatable around an axis perpendicular to the axes of the water supply port and the drainage port, and the ball-shaped valve body around the axis. In a ball valve provided with a lever that is rotated in a rotation angle range of 90 degrees, the peripheral wall of the valve body has an axis perpendicular to the axes of the water supply port and the drainage port, and While providing a branch drain port having a diameter smaller than that of the water inlet port and the water outlet port, the ball-shaped valve body communicates between the water inlet port and the water outlet port, and the opening on the water inlet port side is provided to the water outlet port. A water passage formed in a large-diameter opening that communicates from the Further, the peripheral wall portion of the ball-shaped valve body facing the branch drainage port portion is formed into a large valve portion that closes the drainage port portion when the ball-shaped valve body rotates 90 degrees and the branch drainage port portion is formed. It is characterized in that a small valve portion for closing the branch drainage port portion is formed on the peripheral wall portion of the ball-shaped valve element on the side until the ball-shaped valve element rotates 90 degrees.
(作用) ボール状弁体の通水路を弁本体の給水口部と分岐排水口
部との軸心方向に向けた状態にすると、弁本体の給水口
部側に対向するボール状弁体の通水路の開口部を該給水
口部から分岐排水口部に亘って連通させる大径の開口部
を形成しているので、給水口部側からの給水を分岐排水
口部と排水口部とに流通させて該排水口部を通じての主
水流による放水と、分岐排水口部を通じての分岐水流に
よる放水とを同時に行われ、従って、山林火災の消火活
動時に主水流により消火放水を行いながら分岐水流によ
る残火の消火処理を並行して行うことができる。(Function) When the water passage of the ball-shaped valve element is oriented in the axial direction of the water supply port and the branch drainage port of the valve body, the ball-shaped valve body facing the water supply port side of the valve body passes through. Since the large-diameter opening that connects the opening of the water channel from the water supply port to the branch drainage port is formed, the water supply from the water supply port side is distributed to the branch drainage port and the drainage port. Then, the main water flow through the drainage port and the branch water flow through the branch drainage port are simultaneously performed. Therefore, during the forest fire extinguishing activity, the main water flow extinguishes the water while leaving the branch water flow. Fire extinguishing processing can be performed in parallel.
又、操作レバーを僅かに回動させると、ボール状弁体の
小形の弁部が分岐排水口部に達して該分岐排水口部が閉
止されるが、通水路が給水口部と排水口部間に連通した
状態を維持して排水口部のみを通じての消火放水が行わ
れる。Further, when the operation lever is slightly rotated, the small valve portion of the ball-shaped valve body reaches the branch drainage port portion and the branch drainage port portion is closed, but the water passage is formed into the water supply port portion and the drainage port portion. Fire extinguishing water is discharged only through the drainage port while maintaining communication between them.
次に、操作レバーを90度まで回動させると、ボール状弁
体の大形弁部が排水口部に達して該排水口部を閉止させ
るが、通水路は給水口部と分岐排水口部とに連通した状
態となって、該分岐排水口部を通じての放水による残火
の消火作業が行える。Next, when the operation lever is rotated up to 90 degrees, the large valve portion of the ball-shaped valve body reaches the drainage port portion and closes the drainage port portion, but the water passage has a water supply port portion and a branch drainage port portion. The state of communication with and can be used to extinguish the afterglow by discharging water through the branch drainage port.
(実施例) 以下、この考案の一実施例を図面に基づいて詳述する。(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.
第1図はこの考案に係るボール弁の外観側面図、第2図
は半縦断正面図であって、これら各図において、(1)
は弁本体で、この弁本体(1)は内面が球面状に加工さ
れた本体(1A)と本体フタ(1B)とを嵌合固定してな
り、内面の両側対向部にボールシート(1C)(1C)が貼
着されているとともに、一方のボールシート(1C)側の
本体フタ(1B)にはホースワンタッチ接続用押し輪(2
A)を外嵌保持した差し金具(2B)を螺合して排水口部
(2)が形成され、かつ他方のボールシート(1C)外嵌
の本体(1A)の突出筒部(1a)にはホースワンタッチ接
続用の爪(3A)と爪座(3B)とを内嵌保持した締め輪
(3C)を止めビス(3D)にて固定して給水口部(3)が
上記排水口部(2)と同軸上に形成されている。FIG. 1 is an external side view of the ball valve according to the present invention, and FIG. 2 is a semi-longitudinal front view. In each of these drawings, (1)
Is a valve body. This valve body (1) is formed by fitting and fixing a body (1A) whose inner surface is processed into a spherical shape and a body lid (1B), and ball seats (1C) on opposite sides of the inner surface. (1C) is attached, and the push ring (2) for hose one-touch connection is attached to the main body lid (1B) on one ball seat (1C) side.
The drainage port (2) is formed by screwing the insert metal fitting (2B) holding the external fitting (A) onto the protruding cylindrical part (1a) of the other ball seat (1C) external fitting main body (1A). Is a fastening ring (3C) that holds the hook for one-touch connection (3A) and claw seat (3B) inside, and is fixed with a screw (3D) so that the water supply port (3) is the drainage port (3). It is formed coaxially with 2).
(4)はボールの直径方向の両側部分を切断した形状の
ボール状弁体で、このボール状弁体(4)は上記ボール
シート(1C)(1C)に夫々密着させて上記の弁本体
(1)内に、上記給水口部(3)および排水口部(2)
の軸心に対して直交する軸心(a)の周りに回転可能に
嵌合保持されているとともに、内部に後述する形状の通
水路(4A)が形成されている。(4) is a ball-shaped valve body having a shape in which both sides of the ball in the diameter direction are cut, and the ball-shaped valve body (4) is brought into close contact with the ball seats (1C) (1C), respectively. In 1), the water supply port (3) and the drain port (2)
It is rotatably fitted and held around an axis (a) orthogonal to the axis, and a water passage (4A) having a shape described later is formed inside.
(5)は回転操作レバーで、この回転操作レバー(5)
の基端部は上記ボール状弁体(4)に回転連動させて上
記弁本体(1)における本体(1A)を貫通させ外部に突
出させた回転操作力伝達用ステム(6)に固定連結され
ているとともに、90度の回転角度範囲に亙る切欠部(7
a)を有するストッパー板(7)とこのストッパー板
(7)の切欠部(7a)内に位置する状態で本体(1A)か
ら突設したストッパー(8)とを介して、上記ボール状
弁体(4)の回転軸心(a)周りの90度回転角度範囲で
回転操作自在に構成されている。(5) is a rotation operation lever, and this rotation operation lever (5)
The base end portion of is fixedly connected to the rotational operation force transmitting stem (6) which is rotatably interlocked with the ball-shaped valve body (4) and penetrates the main body (1A) of the valve main body (1) and is projected to the outside. And the notch (7
The ball-shaped valve element is provided via a stopper plate (7) having a) and a stopper (8) protruding from the main body (1A) in a state of being located in the notch (7a) of the stopper plate (7). It is configured to be freely rotatable within a 90-degree rotation angle range around the rotation axis (a) of (4).
(9)は分岐排水口部で、この分岐排水口部(9)は上
記排水口部(2)および給水口部(3)の軸心に対して
直角の軸心をもち、かつ上記排水口部(2)を構成する
差し金具(2B)よりも十分に小径の差し金具(9B)を上
記本体(1A)の周壁部に螺合することにより形成され、
この差し金具(9B)にはホースワンタッチ接続用の押し
輪(9A)が外嵌保持されている。(9) is a branch drain port, and the branch drain port (9) has an axis perpendicular to the axes of the drain port (2) and the water inlet (3), and the drain port. It is formed by screwing an insert fitting (9B) having a diameter sufficiently smaller than that of the insert fitting (2B) constituting the part (2) onto the peripheral wall portion of the main body (1A).
A push ring (9A) for hose one-touch connection is externally fitted and held on the fitting (9B).
上記ボール状弁体(4)の通水路(4A)は、上記レバー
(5)によるボール状弁体(4)の90度範囲での回転操
作にともなって、第3図(A)で示すように、給水口部
(3)に対し大径の排水口部(2)のみが連通する第1
状態と、第3図(B)で示すように、小径の排水口部
(9)のみが連通する第2状態と、第3図(C)で示す
ように、大、小両排水口部(2)(9)がともに連通す
る第3状態とに切換え可能な形状に形成されている。The water passage (4A) of the ball-shaped valve body (4) is rotated by the lever (5) in the 90-degree range of the ball-shaped valve body (4) as shown in FIG. 3 (A). First, only the large-diameter drainage port (2) communicates with the water supply port (3)
As shown in FIG. 3 (B), the second state in which only the small-diameter drainage port (9) communicates with each other, and as shown in FIG. 3 (C), both the large and small drainage ports ( 2) The shape that can be switched to the third state in which (9) communicates with each other is formed.
即ち、ボール状弁体(4)は、その中央部に貫設した通
水路(4A)の両側に大径排水口部(2)を開閉可能な大
形弁部(4a)と、小形排水口部(9)を開閉可能な小形
弁部(4b)とを夫々形成することによって上記通水路
(4A)の給水口部(3)側の開口径を第3図(C)に示
すように、該給水口部(3)と上記小径分岐排水口部
(9)とに亘って連通可能な大径開口部を形成してあ
る。That is, the ball-shaped valve body (4) has a large-sized valve portion (4a) capable of opening and closing the large-diameter drainage port portion (2) on both sides of a water passage (4A) penetrating the central portion, and a small-sized drainage port. As shown in FIG. 3 (C), the opening diameter of the water passage (4A) on the side of the water inlet (3) is formed by forming a small valve portion (4b) capable of opening and closing the portion (9), respectively. A large-diameter opening is formed which can communicate with the water supply port (3) and the small-diameter branch drainage port (9).
尚、上記第1〜第3状態でのボール状弁体(4)および
操作レバー(5)の位置決め手段は、回転操作レバー
(5)の回転軸心近くに取付けたスプリングボール利用
のプランジャー(10)と弁本体(1)側に形成したV形
凹部(11)とのクリック係合手段を採用している。ま
た、図中(12)は締め輪(3C)の外側に嵌合させた保護
タイヤである。The positioning means for the ball-shaped valve element (4) and the operating lever (5) in the above-mentioned first to third states is a plunger using a spring ball mounted near the rotational axis of the rotational operating lever (5) ( 10) and a V-shaped recess (11) formed on the valve body (1) side are employed as click engaging means. Further, (12) in the figure is a protective tire fitted to the outside of the tightening ring (3C).
上記の如く構成されたボール弁(V)は、その給水口部
(3)が第4図で示すように、図外のポンプに接続され
た消防用ホール(H1)の先端部近くに接続され、かつそ
の排水口部(2)に延長ホース(H2)を介して放水ノズ
ル(N)を接続するか、または放水ノズル(N)を直接
に接続させて、例えば山林火災の消火などに使用される
が、このような使用において、放水を保ったままで上記
延長ホース(H2)の接続や離脱を行う場合は、ボール状
弁体(4)の回転操作にて第3図(A)で示す第1状態
から第3図(B)で示す第2状態に切換え操作すること
によってホース(H1)にかかる水圧を分岐排水口部
(9)側に逃がしてウォーターハンマー現象に起因する
ホース(H1)の破裂を防ぐことができる。The ball valve (V) configured as described above has its water supply port (3) connected near the tip of the fire-fighting hole (H1) connected to a pump (not shown) as shown in FIG. In addition, the water discharge nozzle (N) is connected to the drainage port (2) through the extension hose (H2) or the water discharge nozzle (N) is directly connected, and is used for extinguishing a forest fire, for example. However, in such a use, when connecting or disconnecting the extension hose (H2) while keeping the water discharged, the ball-shaped valve body (4) is rotated to operate as shown in FIG. 3 (A). By switching operation from the 1st state to the 2nd state shown in FIG. 3 (B), the water pressure applied to the hose (H1) is released to the side of the branch drainage port (9), and the hose (H1) caused by the water hammer phenomenon You can prevent a burst.
また、上記分岐排水口部(9)にも小径のホース(H3)
を接続して、ボール状弁体(4)を回転操作し第3図
(C)で示す第3状態に切換えることによって、大径排
水口部(2)、延長ホース(H2)、ノズル(N)を通し
ての主水流の放出とともに、小径排水口部(9)、小径
ホース(H3)を通しての分岐水流の放出を行って、残火
処理を併行した消火放水を行うことができる。In addition, a small diameter hose (H3) is also attached to the branch drainage port (9).
And the ball-shaped valve body (4) is rotated to switch to the third state shown in FIG. 3 (C), whereby the large diameter drainage port (2), extension hose (H2), nozzle (N) ), The main water flow is discharged through the small diameter drainage port (9), and the branch water flow is discharged through the small diameter hose (H3).
(考案の効果) 以上のように本考案のボール弁によれば、ボール状弁体
の通水路の大径開口部を弁本体の給水口部と分岐排水口
部との連通させた状態においては、給水口部側からの給
水を分岐排水口部と排水口部とに流通させて該排水口部
を通じての主水流による放水と、分岐排水口部を通じて
の分岐水流による放水とを同時に行うことができ、従っ
て、山林火災の消火活動時に主水流により消火放水を行
いながら分岐水流による残火の消火処理を並行して行う
ことができて効率のよい消火作業が可能となるものであ
る。(Effect of the Invention) As described above, according to the ball valve of the present invention, when the large-diameter opening of the water passage of the ball-shaped valve body is in communication with the water supply port of the valve body and the branch drainage port, It is possible to distribute the water supply from the water supply port side to the branch drainage port and the drainage port, and simultaneously perform the water discharge by the main water flow through the drainage port and the water discharge by the branch water flow through the branch drainage port. Therefore, it is possible to perform the extinguishing treatment of the afterglow by the branch water stream in parallel while performing the fire extinguishing water discharge by the main water stream during the forest fire extinguishing activity, which enables efficient extinguishing work.
又、操作レバーを90度まで回動させる途中において、ボ
ール状弁体の小形の弁部で分岐排水口部を閉止させ且つ
通水路を給水口部と排水口部に連通させた状態に保持す
ることができ、従って、排水口部のみを通じての消火放
水を行うことができる。Also, while the operation lever is being rotated up to 90 degrees, the small drain valve part of the ball-shaped valve element closes the branch drain port and keeps the water passage in communication with the water supply port and the drain port. Therefore, the fire extinguishing water can be discharged only through the drain port.
さらに、操作レバーを90度まで回動させると、ボール状
弁体の大形弁部で排水口部を閉止させ且つ通水路を給水
口部と分岐排水口部とに連通させた状態にすることがで
き、従って、放水の全面停止によって生じるウォータハ
ンマー現象による接続ホース等の損傷を防止することが
できると共に分岐排水口部を通じての放水による残火の
消火作業を続行し得るものである。Further, when the operating lever is rotated up to 90 degrees, the large valve part of the ball-shaped valve body closes the drainage port and connects the water passage to the water supply port and the branch drainage port. Therefore, it is possible to prevent damage to the connection hose and the like due to the water hammer phenomenon caused by the complete stoppage of water discharge, and it is possible to continue extinguishing the afterfire due to water discharge through the branch drain port.
第1図はこの考案に係るボール弁の外観側面図、第2図
は半縦断正面図、第3図(A)(B)(C)は動作状態
を説明するための拡大縦断側面図、第4図は使用状態を
説明する側面図である。 (1)…弁本体、(2)…排水口部、(3)…給水口
部、(4)…ボール状弁体、(4A)…通水路、(5)…
回転操作レバー、(9)…分岐排水口部。FIG. 1 is an external side view of the ball valve according to the present invention, FIG. 2 is a semi-longitudinal front view, and FIGS. 3 (A), (B), and (C) are enlarged vertical side views for explaining the operating state. FIG. 4 is a side view illustrating a usage state. (1) ... Valve body, (2) ... Drainage port part, (3) ... Water supply port part, (4) ... Ball-shaped valve body, (4A) ... Water passage, (5) ...
Rotation operation lever, (9) ... Branch drainage port.
フロントページの続き (56)参考文献 特開 昭63−19476(JP,A) 実開 昭63−128368(JP,U) 実開 昭61−17573(JP,U) 実開 昭57−197557(JP,U) 実開 昭55−181069(JP,U) 実公 昭8−9638(JP,Y1)Continuation of the front page (56) Reference JP-A-63-19476 (JP, A) Actually opened 63-128368 (JP, U) Actually opened 61-17573 (JP, U) Actually opened 57-197557 (JP , U) Actual development 55-181069 (JP, U) Actual public 8-9638 (JP, Y1)
Claims (1)
設けている弁本体と、この弁本体内に上記給水口部およ
び排水口部の軸心に対して直交する軸心の周りに回転可
能に嵌合保持されたボール状弁体と、このボール状弁体
を上記軸心周りに90度の回転角度範囲で回転操作するレ
バーとを備えたボール弁において、上記弁本体の周壁部
に、上記給水口部および排水口部の軸心に対して直角の
軸心をもち、かつ上記給水口部および排水口部よりも小
径の分岐排水口部を設ける一方、上記ボール状弁体に上
記給水口部と排水口部間を連通させかつ給水口部側の開
口部を該給水口部から上記分岐排水口部に亘って連通さ
せる大径の開口部に形成してなる通水路を設け、さら
に、分岐排水口部に対向したボール状弁体の周壁部を該
ボール状弁体が90度回転した際に上記排水口部を閉止す
る大形弁部に形成すると共に分岐排水口部側のボール状
弁体の周壁部に該ボール状弁体が90度回転するまでの間
に分岐排水口部を閉止する小形の弁部を形成しているこ
とを特徴とするボール弁。1. A valve body having a water supply port and a drainage port coaxially provided on both sides thereof, and an axial center orthogonal to the axial center of the water supply port and the drainage port in the valve body. A ball valve provided with a ball-shaped valve body rotatably fitted and held around the valve body, and a lever for rotating the ball-shaped valve body in a rotation angle range of 90 degrees around the axis, On the peripheral wall of the water supply port and the drain port, a branch drain port having a smaller axis than the water inlet and the drain port is provided, while the ball shape is provided. The valve body is formed with a large-diameter opening that communicates between the water supply port and the drainage port and connects the opening on the water supply port side from the water supply port to the branch drainage port. A water channel is provided, and the ball-shaped valve body is rotated 90 degrees around the peripheral wall of the ball-shaped valve body facing the branch drainage port. It is formed in a large valve part that closes the drainage port part when it is rolled, and the branch drainage port is formed on the peripheral wall part of the ball valve part on the branch drainage part side until the ball valve part rotates 90 degrees. A ball valve characterized in that a small valve portion for closing the portion is formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987200204U JPH0716145Y2 (en) | 1987-12-30 | 1987-12-30 | Ball valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987200204U JPH0716145Y2 (en) | 1987-12-30 | 1987-12-30 | Ball valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01104477U JPH01104477U (en) | 1989-07-14 |
JPH0716145Y2 true JPH0716145Y2 (en) | 1995-04-12 |
Family
ID=31490626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987200204U Expired - Lifetime JPH0716145Y2 (en) | 1987-12-30 | 1987-12-30 | Ball valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0716145Y2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6117573U (en) * | 1984-07-05 | 1986-02-01 | 光陽産業株式会社 | Ball pot with side holes |
-
1987
- 1987-12-30 JP JP1987200204U patent/JPH0716145Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01104477U (en) | 1989-07-14 |
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