JPS592367Y2 - Electric flow proportional control valve - Google Patents
Electric flow proportional control valveInfo
- Publication number
- JPS592367Y2 JPS592367Y2 JP18029278U JP18029278U JPS592367Y2 JP S592367 Y2 JPS592367 Y2 JP S592367Y2 JP 18029278 U JP18029278 U JP 18029278U JP 18029278 U JP18029278 U JP 18029278U JP S592367 Y2 JPS592367 Y2 JP S592367Y2
- Authority
- JP
- Japan
- Prior art keywords
- bobbin
- electromagnetic coil
- communication hole
- spring means
- proportional control
- 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
Links
Landscapes
- Sliding Valves (AREA)
- Multiple-Way Valves (AREA)
- Magnetically Actuated Valves (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Description
【考案の詳細な説明】
本考案は、電磁的に作動するりニアモータによって、ス
ライド型バルブを開閉制御させ流4体の連通流量を制御
する電動式流量比例制御弁に関するものである。[Detailed Description of the Invention] The present invention relates to an electric flow rate proportional control valve that controls the opening and closing of a slide type valve using an electromagnetically operated linear motor to control the communication flow rate of four flow bodies.
一般にこの種の電動式制御弁は、中空鉄心、該鉄心上に
摺動可能に配設されたボビン、該ボビン上の電磁コイル
の巻線に対し直角に磁束が通るように配設された永久磁
石、該永久磁石の磁気回路を鉄心と共に形成する磁性体
から成るリニアモータ部と、鉄心上の連通穴を開閉作動
し入力ポートと出力ポートを連通ずる流体の流量を制御
するスライド型バルブ部とから構成され、電磁コイルに
印加される入力端子値に応答してボビンを作動変位させ
、このボビンに応動して流体の連通流量を制御している
。In general, this type of electric control valve consists of a hollow iron core, a bobbin slidably disposed on the core, and a permanent coil disposed so that the magnetic flux passes at right angles to the windings of the electromagnetic coil on the bobbin. A magnet, a linear motor section made of a magnetic material that forms a magnetic circuit of the permanent magnet together with an iron core, and a slide-type valve section that opens and closes a communication hole on the iron core to control the flow rate of fluid that communicates the input port and the output port. The bobbin is actuated in response to the input terminal value applied to the electromagnetic coil, and the fluid communication flow rate is controlled in response to the bobbin.
而して電磁コイルの巻線の両端は、ボビンを非作用位置
に付勢する機能をも有する一対のスプリング手段を介し
て夫々のターミナル端子に接続される構成であった。Both ends of the winding of the electromagnetic coil were connected to respective terminal terminals via a pair of spring means that also had the function of urging the bobbin to a non-operating position.
つまり、スプリング手段はターミナル端子から電磁コイ
ルへの入力電流の伝達手段の機能を有していた。In other words, the spring means had the function of transmitting an input current from the terminal terminal to the electromagnetic coil.
更に詳述するに電磁コイルの巻線の両端と一対のスプリ
ングの接続部は、ボビン上、又はボビンに極めて近接し
た位置でなされるものであった。More specifically, the connections between both ends of the winding of the electromagnetic coil and the pair of springs were made on the bobbin or at a position very close to the bobbin.
従って、ボビンが金属製である場合には、電磁コイルと
スプリングの接続部にて正極側及び負極側が短絡してし
まい結局、電磁コイルに電流が流れず弁機能が達成不可
能になるという不利益があった。Therefore, if the bobbin is made of metal, there is a disadvantage that the positive and negative electrode sides will be short-circuited at the connection between the electromagnetic coil and the spring, resulting in no current flowing through the electromagnetic coil, making it impossible to achieve the valve function. was there.
しかしながら、ボビンを樹脂製絶縁材にて形成すると、
所望の小さなりリアランスを要求される鉄心に対応する
ボビン内径の成形精度が低下し、且つ耐摩耗性が劣化す
るという不利益に至り、樹脂製ボビンの内径に金属製ス
リーブを固着させて上記不利益を解消しようとしても、
金属製スリーブ付樹脂製ボビンに於ては径方向長さが増
大して、永久磁石と鉄心間のりリアランスが増大し、電
磁コイルに加わる入力電気信号に応答した所望の吸引力
か゛発生し7ないといつ不利益に至るもので゛あった。However, if the bobbin is made of resin insulation material,
The forming accuracy of the bobbin inner diameter corresponding to the iron core that requires a desired small tolerance is reduced, and the wear resistance is deteriorated, which is a disadvantage. Even if you try to eliminate profits,
In a resin bobbin with a metal sleeve, the radial length increases, the clearance between the permanent magnet and the iron core increases, and the desired attractive force is generated in response to an input electrical signal applied to the electromagnetic coil. At any time, it would be a disadvantage.
そこで゛本考案は、電磁コイルスプリング子役接合部に
於て、電源の正極及び負極の短絡を防ぐことを目的とす
るものである。Therefore, the object of the present invention is to prevent short-circuiting between the positive and negative electrodes of the power source at the electromagnetic coil spring child joint.
当該目的を達成するために本考案は、ボビン上に固定さ
れスプリング手段の一端を支持する絶縁性部材と、該絶
縁性部材にカシメ固定されるイム熱性ハトメ部材とを備
え、電磁コイルの巻線の両端とスプリング手段との接続
部を、上記ハl−メ部材を介し7てハンダ付けにより固
定し72、更に該ハンダ付は部を絶縁樹脂により保護す
る構成を有する。In order to achieve this object, the present invention includes an insulating member fixed on the bobbin to support one end of the spring means, and an immovable eyelet member crimped and fixed to the insulating member. The connection portions between both ends of the spring means and the spring means are fixed by soldering 72 via the fitting member 7, and the soldering portions are further protected with an insulating resin.
この構成を採用することに依り、電磁コイルの巻線の両
端と、電源に至る一対の手段との接続部を、ボビンに固
定される絶縁性部+4どハンダ付は部を保護する絶縁樹
脂とによって完全に保護したのでパ、当該接続部で正極
側ど負1i@側が短絡するという問題が解消さI″L、
所望時期に電磁=フィルに電流か流れないという不利益
は解消される3、更に上記の如く、接続部の保護手段を
設()たので、ボビンは成形精度、耐摩耗性に優れた金
属材料で゛形成可能であり、従って永久磁石と鉄心間の
クリアランスを小さくし得、ボビンの吸引力を・火とす
ることかで゛きる効果がある。By adopting this configuration, the connection between both ends of the winding of the electromagnetic coil and the pair of means leading to the power source is made of an insulating part fixed to the bobbin + an insulating resin that protects the soldered part. Since it was completely protected by P, the problem of short circuit between the positive and negative terminals at the relevant connection point was solved.
This eliminates the disadvantage that current does not flow through the electromagnetic fill at the desired time3.Furthermore, as mentioned above, we have provided protection for the connection, so the bobbin is made of a metal material with excellent forming precision and wear resistance. Therefore, the clearance between the permanent magnet and the iron core can be reduced, and the suction force of the bobbin can be reduced.
さて、前述した様にこの種の電動式流量比例制御弁は、
スプリング手段の一端が電磁コ、イルに接続され、その
他端がターミナル端子に接続される構成であり、電磁コ
2イルに印加される入力端子に応動してボビンが軸方向
にスラフイド作動1−るものである。Now, as mentioned above, this type of electric flow rate proportional control valve is
One end of the spring means is connected to an electromagnetic coil, and the other end is connected to a terminal terminal, and the bobbin is axially sloughed in response to an input terminal applied to the electromagnetic coil. It is something.
この時このボビンの変位作動に伴いスプリング手段が伸
縮作動を繰り返すので、スプリング手段の可動端部、即
ちスプリング手段と電磁コイルの接続部(、;大きな荷
重が加わることになる。At this time, since the spring means repeats the expansion and contraction operation as the bobbin is displaced, a large load is applied to the movable end of the spring means, that is, the connection part between the spring means and the electromagnetic coil.
従って、この接続部の固定は、スプリング手段の伸縮作
動に対しても十分に耐えることかで゛きる強度が必要と
する。Therefore, the fixing of this connection requires sufficient strength to withstand the expansion and contraction of the spring means.
本考案の構成に従うと、絶縁性部材にハI・メ部材をカ
シメ固定し、該)117部材を介して接続部をハンダ付
けにより固定するもので゛あるので゛、接続部の固定は
その強度が十分に確保される。According to the structure of the present invention, the 117 member is fixed to the insulating member by caulking, and the connection part is fixed by soldering through the 117 member, so the fixation of the connection part is determined by its strength. will be sufficiently secured.
以下、本考案に従った一実施例について、添付図面に基
づいて説明する。An embodiment according to the present invention will be described below with reference to the accompanying drawings.
図面に示される電動式流量比例制御弁10に於て、人力
ポート11と第1出カポ−H2が固定される磁性体ボテ
゛イ13に、第2出力ポート14を有する磁性体カバー
15が一体的に且つ気密的に結合されている。In the electric flow rate proportional control valve 10 shown in the drawing, a magnetic body cover 15 having a second output port 14 is integrated with a magnetic body 13 to which the manual port 11 and the first output port H2 are fixed. and are airtightly coupled.
ボビン13上の軸+二に中空鉄心18が配設され、該鉄
心の内部中空部は遮断壁19により第1室20ど第2室
21とに分割されている。A hollow iron core 18 is disposed on the shaft +2 on the bobbin 13, and the inner hollow part of the iron core is divided into a first chamber 20 and a second chamber 21 by a blocking wall 19.
第1室20は第1−出力ポー ト12に連通し、第2室
21は第2出カポ−1〜に連通している6沖空鉄心18
上に非磁性体がら戊る金属性ボビン22が摺動可能に配
設され、該ボビン上に電磁コイル23が巻かれている。The first chamber 20 communicates with the first output port 12, and the second chamber 21 communicates with the second output port 1.
A metal bobbin 22 made of non-magnetic material is slidably disposed on the bobbin, and an electromagnetic coil 23 is wound on the bobbin.
更に、該電磁コイル23の巻線に対し直角に磁束が通る
ように一対の永久磁石24.25がボテ゛イ13に固定
される磁性体支持部材16.17によって配設さt’L
s斯様にして該永久磁石24.25の磁気回路が鉄心
1B、支持部材16、17、ボディ13、カバー15に
よって形成され、可動二フィル型リニアモータを構成し
ている。Further, a pair of permanent magnets 24.25 are arranged by magnetic support members 16.17 fixed to the body 13 so that the magnetic flux passes at right angles to the windings of the electromagnetic coil 23.
In this way, the magnetic circuit of the permanent magnets 24, 25 is formed by the iron core 1B, the supporting members 16, 17, the body 13, and the cover 15, and constitutes a movable two-fill type linear motor.
中空鉄心18−[、には、第1室20と人カポ−I−1
1を連通ずる第0連通穴2Bと、第2室21ど入カポ−
!−11を連通ずる第2連通穴29どが、夫々長穴4大
に複数個形成されている。The hollow core 18-[, includes the first chamber 20 and the capo-I-1
The 0th communication hole 2B that communicates with 1 and the capo that enters the 2nd chamber 21
! -11, a plurality of second communication holes 29 are formed in each of the four long holes.
ボビン22は、電磁コイル23に印加される電流値に応
答比例して第1及び第2連通穴28.29上を摺動し該
連通穴28゜29の開口面積を制御するもので゛ある。The bobbin 22 slides over the first and second communicating holes 28 and 29 in proportion to the current value applied to the electromagnetic coil 23 to control the opening areas of the communicating holes 28 and 29.
この時ボビン22は、一方の連通穴を閉じる時に他方の
連通穴を開くよ0うに作用するもので、一つまり人力ポ
ート11と第1出カポ−[2間の連通及び゛第2出カポ
ー112間の連通を、交互に切換制御するものである。At this time, the bobbin 22 acts so that when one communication hole is closed, the other communication hole is opened. The communication between the two is alternately switched and controlled.
中空鉄心18と磁性体ボデ゛イ13との間にスプリング
汀、ルダー30が配設され、該ホルダー30内に2個の
互いに中心径の異なるコイルスプリング31゜32が張
設されている。A spring holder 30 is disposed between the hollow iron core 18 and the magnetic body 13, and two coil springs 31 and 32 having different center diameters are stretched within the holder 30.
該両スプリング31.32によりボビン22は図示左方
に常時付勢され、電磁コイル23に電流が印加されない
時はボディ13に形成されたスI・ツバ33に当接し、
その結果ボビン22は第1連通穴28を閉じ第2連通穴
29を開く位置に保持される。The bobbin 22 is always biased to the left in the figure by both springs 31 and 32, and when no current is applied to the electromagnetic coil 23, the bobbin 22 comes into contact with the collar 33 formed on the body 13.
As a result, the bobbin 22 is held in a position where the first communication hole 28 is closed and the second communication hole 29 is opened.
ボビン13上にはスプリング31.32の一端面を保持
する絶縁性樹脂部材26が固定配置され、該絶縁性樹脂
部材26に伝熱性ハトメ部材35、36がカシメ固定さ
れる。An insulating resin member 26 that holds one end surface of the springs 31 and 32 is fixedly arranged on the bobbin 13, and heat conductive eyelet members 35 and 36 are fixed to the insulating resin member 26 by caulking.
両スプリング31.32の各一端31a、32aと電磁
コイル23の各端23a、23bとの接続部が、ハトメ
部材35.36を介してハンダ付けすることによって固
定され、更にこのハンダ付は部が絶縁樹脂33.34に
より保護される。The connections between the ends 31a, 32a of both springs 31, 32 and the ends 23a, 23b of the electromagnetic coil 23 are fixed by soldering through eyelet members 35, 36, and the soldering It is protected by insulating resin 33 and 34.
この様にして、電磁コイル23の両端23a。23bと
スプリング31,32ノ各一端31 a、 32 aと
の夫々の接続部は、絶縁性樹脂部材26及び絶縁樹脂3
3.34によって完全に保護され、而して上記接続部に
於て、電源の正極及び負極に至る両スプリング31.3
2の各一端31 a、 323等が短絡することが防止
され、所望時期に電磁コイル23に電流が流れないとい
うことはない。In this way, both ends 23a of the electromagnetic coil 23. 23b and one end 31a, 32a of the springs 31, 32, respectively, are connected to the insulating resin member 26 and the insulating resin 3.
3.34, and at the above connection both springs 31.3 leading to the positive and negative poles of the power supply.
2 is prevented from being short-circuited, and current does not fail to flow through the electromagnetic coil 23 at a desired time.
両スプリング31.32の各他端(スプリング32の他
端32 bのみ図示される)は、伝熱性ハトメ部材37
がカシメられるホルダー30の孔30 aを介して貫通
延在し、対応ターミナル端子(スプリング32の他端3
2 bに対応する端子3Bのみが図示されている)にハ
ンダ付は等によって接続される。Each other end of both springs 31, 32 (only the other end 32b of the spring 32 is shown) is connected to a heat conductive eyelet member 37.
extends through the hole 30a of the holder 30 to be crimped, and connects to the corresponding terminal terminal (the other end 3 of the spring 32).
(Only the terminal 3B corresponding to 2B is shown) is connected by soldering or the like.
両ターミナル端子はコネクター39を介して適宜電源の
正極・負極に夫々接続されていると共に、絶縁支持部材
40によってカバー15の切り欠き41内に配置支持さ
れ、且つ絶縁樹脂42によって保持されている。Both terminal terminals are appropriately connected to the positive and negative electrodes of a power source via connectors 39, and are supported by an insulating support member 40 within a notch 41 of the cover 15, and are held by an insulating resin 42.
43はシリコンゴム製シール部材44を介してカバー1
5に螺合配設される調節ネジで、その内端はホルダー3
0に当接し、而して該ネジを螺進、螺退させることによ
ってホルダー30の位置を調整し、結局、両スプリング
31.32の付勢力を調整できる。43 is attached to the cover 1 via a silicone rubber seal member 44.
5 is an adjustment screw screwed into the holder 3, and its inner end is screwed into the holder 3.
0, and by screwing the screw forward and backward, the position of the holder 30 can be adjusted, and as a result, the urging force of both springs 31 and 32 can be adjusted.
45はホルダー30とカバー15間に配設されるOリン
グシール部材であり、上記シリコンシール部材44と協
同して、カバ−15内部と外部とを密封している。Reference numeral 45 denotes an O-ring sealing member disposed between the holder 30 and the cover 15, which cooperates with the silicone sealing member 44 to seal the inside and outside of the cover 15.
支持部材16.17とホルダー30間に配設されるリタ
ーンスプリング46はホルダー30、従ってボビン22
の非作用位置への復帰を保障するためのものであるが、
両スプリング31゜32の付勢力を適宜設定すれば、当
該リターンスプリングの配設は必ずしも必要でない。A return spring 46 arranged between the support member 16 , 17 and the holder 30 is connected to the holder 30 and thus to the bobbin 22 .
This is to ensure the return of the
If the biasing forces of both springs 31 and 32 are set appropriately, the provision of the return spring is not necessarily required.
尚、該リターンスプリング46の付勢力も上記ネジ4B
によって調整可能である。Incidentally, the biasing force of the return spring 46 is also the same as that of the screw 4B.
It can be adjusted by
上記構成に於て、次にその作用について説明する。Next, the operation of the above configuration will be explained.
電磁コイル23に入力電流が印加されていない時は、ボ
ビン22は両スプリング31.32及びリターンスプリ
ング46により図示左方に付勢され、第1連通穴28を
閉じ第2連通穴29を開く位置に保持されている。When no input current is applied to the electromagnetic coil 23, the bobbin 22 is biased to the left in the figure by both springs 31, 32 and the return spring 46, and is in a position where the first communication hole 28 is closed and the second communication hole 29 is opened. is maintained.
従って入力ポート11は第1出力ポート12と遮断され
、第2出力ポート14と連通している。Therefore, the input port 11 is cut off from the first output port 12 and communicated with the second output port 14.
また通常時、永久磁石24.25から発生する磁束によ
り中空鉄心1B、支持部材16.17、ボディ13、カ
バー15等を介する閉ループの磁気回路が形成され、そ
の一部は電磁コイル23に通じている。In addition, under normal conditions, a closed-loop magnetic circuit is formed by the magnetic flux generated from the permanent magnets 24 and 25 via the hollow core 1B, the support member 16 and 17, the body 13, the cover 15, etc., and a part of it is connected to the electromagnetic coil 23. There is.
この状態に於て、電磁コイル23に入力電流が印加され
ると、周知のフレミング左手の注目1jにより、図示右
方向に電流値に比例した力が発生する。In this state, when an input current is applied to the electromagnetic coil 23, a force proportional to the current value is generated in the right direction in the figure due to the well-known attention 1j of Fleming's left hand.
従って、ボビン22は両スプリング31.32の付勢力
に抗して図示右方向に作動変位し、その結果第1連通穴
28を開くと共に第2連通穴29を閉じる。Therefore, the bobbin 22 is actuated and displaced in the right direction in the figure against the biasing forces of both springs 31 and 32, and as a result, the first communication hole 28 is opened and the second communication hole 29 is closed.
第1及び第2連通穴2B、 29は十分な軸方向の長さ
を有し、ボビン22の右方変位量に応答比例して、第1
連通穴2Bの開口面積が増大し第2連通穴29の開口面
積が減少する。The first and second communication holes 2B, 29 have a sufficient length in the axial direction, and the first and second communication holes 2B and 29
The opening area of the communication hole 2B increases and the opening area of the second communication hole 29 decreases.
この様に、ボビン22は、入力ポート11と第1出力ポ
ート12間の連通及び第2出力ポート14間の連通を、
交互に切換制御する所謂三方向タイプの制御弁として作
用するものである。In this way, the bobbin 22 provides communication between the input port 11 and the first output port 12 and communication between the second output port 14.
It functions as a so-called three-way type control valve that performs switching control alternately.
尚、上記実施例の電動式流量比例制御弁10を、例えば
自動車エンジンの排気ガス浄化システムに於て、入力ポ
ート11をエアポンプに連結し、第1出力ポート12を
排気系に連結し、第2出力ポート14をエアクリーナに
連結し、更にエンジン温度、エンジン負圧、エンジン回
転数等に応じた出力信号を作成発生するコンピュータ等
により電磁コイル23が入力電気信号を受けるように構
成すれば、周知の二次空気供給システムの機能を達成す
ることが出来る。The electric flow rate proportional control valve 10 of the above embodiment may be used, for example, in an exhaust gas purification system for an automobile engine, with the input port 11 connected to an air pump, the first output port 12 connected to an exhaust system, and the second output port 12 connected to an exhaust system. If the output port 14 is connected to an air cleaner and the electromagnetic coil 23 is configured to receive an input electric signal by a computer or the like that generates an output signal according to engine temperature, engine negative pressure, engine rotation speed, etc., the well-known method can be used. The function of a secondary air supply system can be achieved.
図は本考案の一実施例を示す電動式流量比例制御弁の断
面図である。
10゛電動式流量比例制御弁、11:入力ポート、12
.14:出力ポート、13:ボテ゛イ、15:カバー1
8:鉄心、22:ボビン、23:電磁コイル、24.2
5 :永久磁石、26:絶縁性樹脂部材、2B、 29
:連通穴、3i、32ニスプリング、38:ターミナ
ル端子。The figure is a sectional view of an electric flow rate proportional control valve showing an embodiment of the present invention. 10゛Electric flow rate proportional control valve, 11: Input port, 12
.. 14: Output port, 13: Body, 15: Cover 1
8: Iron core, 22: Bobbin, 23: Electromagnetic coil, 24.2
5: Permanent magnet, 26: Insulating resin member, 2B, 29
: Communication hole, 3i, 32 spring, 38: Terminal terminal.
Claims (1)
イ内の軸上に配設され前記両ポートを連通ずる連通穴を
有する中空鉄心、該鉄心上に摺動可能に配設され前記連
通穴の開口面積を制御するボビン、該ボビン上に巻かれ
た電磁コイルの巻線に対し直角に磁束が通るように配設
された永久磁石、該永久磁石の磁気回路を前記鉄心と共
に形成する磁性体、及び前記ボビンを前記連通穴の全閉
する方向に付勢すると共にその一端が前記電磁コイルの
巻線の両端に接続され、他端がターミナル端子に接続さ
れる一対のスプリング手段を有する電動式流量比例制御
弁に於いて、前記ボビン上に固定され前記スプリング手
段の一端を支持する絶縁性部材にカシメ固定される伝熱
性ハトメ部材とを備え、前記電磁コイルの巻線の両端と
前記スプリング手段との接続部を、前記ハトメ部材を介
してハンダ付けにより固定し、更に該ハンダ付は部を絶
縁樹脂により保護することを特徴とする電動式流量比例
制御弁。a body having an input port and an output port; a hollow core disposed on a shaft within the body and having a communication hole communicating the two ports; an opening area of the communication hole disposed slidably on the core; a bobbin for controlling the magnetic field; a permanent magnet disposed so that a magnetic flux passes perpendicularly to the winding of the electromagnetic coil wound on the bobbin; a magnetic body forming a magnetic circuit of the permanent magnet together with the iron core; Electric flow rate proportional control having a pair of spring means that urges the bobbin in a direction to fully close the communication hole, and whose one end is connected to both ends of the winding of the electromagnetic coil and whose other end is connected to a terminal terminal. The valve includes a heat conductive eyelet member crimped to an insulating member fixed on the bobbin and supporting one end of the spring means, the connection between both ends of the winding of the electromagnetic coil and the spring means. An electric flow rate proportional control valve, characterized in that the part is fixed by soldering through the eyelet member, and the soldered part is further protected with an insulating resin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18029278U JPS592367Y2 (en) | 1978-12-27 | 1978-12-27 | Electric flow proportional control valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18029278U JPS592367Y2 (en) | 1978-12-27 | 1978-12-27 | Electric flow proportional control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5597270U JPS5597270U (en) | 1980-07-05 |
JPS592367Y2 true JPS592367Y2 (en) | 1984-01-23 |
Family
ID=29191965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18029278U Expired JPS592367Y2 (en) | 1978-12-27 | 1978-12-27 | Electric flow proportional control valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS592367Y2 (en) |
-
1978
- 1978-12-27 JP JP18029278U patent/JPS592367Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5597270U (en) | 1980-07-05 |
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