JPH0638776Y2 - Check valve for negative pressure booster - Google Patents
Check valve for negative pressure boosterInfo
- Publication number
- JPH0638776Y2 JPH0638776Y2 JP675692U JP675692U JPH0638776Y2 JP H0638776 Y2 JPH0638776 Y2 JP H0638776Y2 JP 675692 U JP675692 U JP 675692U JP 675692 U JP675692 U JP 675692U JP H0638776 Y2 JPH0638776 Y2 JP H0638776Y2
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- pressure booster
- intake manifold
- check valve
- flexible hose
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Pipe Accessories (AREA)
- Check Valves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、内燃機関の吸気マニホ
ールドと負圧ブースタとを接続する可撓性ホースの中間
部に介装され、吸気マニホールドから負圧ブースタへの
流体の移動を規制する負圧ブースタ用チェックバルブに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in the middle of a flexible hose connecting an intake manifold and a negative pressure booster of an internal combustion engine, and regulates the movement of fluid from the intake manifold to the negative pressure booster. Check valve for negative pressure booster
【０００２】[0002]
【従来の技術】自動車のブレーキ用負圧ブースタと、そ
の負圧源となる内燃機関の吸気マニホールドとを接続す
る可撓性ホースの中間部には、吸気マニホールドに発生
する負圧が負圧ブースタ側へ伝達することを許容し、そ
の逆の伝達を規制するチェックバルブが介装される。2. Description of the Related Art A negative pressure booster for a negative pressure generated in an intake manifold is provided in an intermediate portion of a flexible hose connecting a negative pressure booster for a vehicle brake and an intake manifold of an internal combustion engine, which is a source of the negative pressure. A check valve is provided which allows the transmission to the side and regulates the opposite transmission.
【０００３】ところで、内燃機関が停止して吸気マニホ
ールドの負圧が消滅すると、可撓性ホース内に残存する
負圧に吸引されて吸気マニホールド内のガソリン混合気
が可撓性ホース内に侵入し、その後の温度低下に伴って
液化する。このガソリンがチェックバルブの僅かな隙間
を通って負圧ブースタの内部に流入すると、負圧ブース
タのゴム部材等の耐久性に悪影響を及ぼす可能性があ
る。これを防ぐために、チェックバルブの内部にガソリ
ンを吸着し得る吸着剤を設け、吸気マニホールドから負
圧ブースタへのガソリンの流入を防止するものが提案さ
れている（特開昭５６−６０７６３号公報参照）。When the internal combustion engine stops and the negative pressure in the intake manifold disappears, the negative pressure remaining in the flexible hose is sucked and the gasoline mixture in the intake manifold enters the flexible hose. , And liquefies with the subsequent temperature decrease. If this gasoline flows into the negative pressure booster through a slight gap in the check valve, it may adversely affect the durability of the rubber member of the negative pressure booster. In order to prevent this, it has been proposed to provide an adsorbent capable of adsorbing gasoline inside the check valve to prevent the inflow of gasoline from the intake manifold to the negative pressure booster (see Japanese Patent Laid-Open No. 56-60763). ).
【０００４】[0004]
【考案が解決しようとする課題】しかしながら、上記従
来のチェックバルブは、吸着剤を設けたことによる製造
コストの上昇と外形寸法の大型化が問題になるばかり
か、吸着剤の劣化による性能低下が懸念される。However, in the above-mentioned conventional check valve, not only the increase in manufacturing cost due to the provision of the adsorbent and the enlargement of the outer dimension become problems, but also the performance deterioration due to the deterioration of the adsorbent occurs. I'm worried.
【０００５】本考案は前述の事情に鑑みてなされたもの
で、簡単な構造で吸気マニホールドから負圧ブースタへ
のガソリンの流入を確実に阻止することを目的とする。The present invention has been made in view of the above circumstances, and an object thereof is to reliably prevent the inflow of gasoline from the intake manifold to the negative pressure booster with a simple structure.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
に、本考案は、内燃機関の吸気マニホールドと負圧ブー
スタとを接続する可撓性ホースの中間部に介装され、吸
気マニホールドから負圧ブースタへの流体の移動を規制
する負圧ブースタ用チェックバルブにおいて、バルブハ
ウジングの吸気マニホールド側の端部外周面に可撓性ホ
ースの内周面に当接するリブを突設し、前記バルブハウ
ジングの端部外周面と前記可撓性ホースの内周面との間
に空間を形成したことを特徴とする。In order to achieve the above-mentioned object, the present invention is provided in an intermediate portion of a flexible hose connecting an intake manifold and a negative pressure booster of an internal combustion engine, and a negative hose from the intake manifold. In a negative pressure booster check valve for restricting movement of fluid to a pressure booster, a rib that abuts an inner peripheral surface of a flexible hose is provided on an outer peripheral surface of an end portion of a valve housing on the intake manifold side, A space is formed between the outer peripheral surface of the end of the and the inner peripheral surface of the flexible hose.
【０００７】[0007]
【実施例】以下、図面に基づいて本考案の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【０００８】図１〜図４は本考案の第１実施例を示すも
ので、図１はそのチェックバルブの使用状態を示す図、
図２は図１の要部拡大断面図（図４の２−２線断面
図）、図３は図２の３方向矢視図、図４は図２の４−４
線断面図である。1 to 4 show a first embodiment of the present invention, and FIG. 1 is a view showing a use state of the check valve,
2 is an enlarged cross-sectional view (cross-sectional view taken along line 2-2 of FIG. 4) of FIG. 1, FIG. 3 is a three-direction arrow view of FIG. 2, and FIG. 4 is 4-4 of FIG.
It is a line sectional view.
【０００９】図１に示すように、内燃機関の吸気マニホ
ールドＭに設けた負圧導入管Ｍ1 と負圧ブースタＢの負
圧導入管Ｂ1 とは、ゴムや合成樹脂等で形成された可撓
性ホースＨによって相互に接続され、その可撓性ホース
Ｈの中間部にチェックバルブＶが圧入される。As shown in FIG. 1, the negative pressure introducing pipe M 1 provided in the intake manifold M of the internal combustion engine and the negative pressure introducing pipe B 1 of the negative pressure booster B may be made of rubber or synthetic resin. The flexible hose H is connected to each other, and the check valve V is press-fitted in the middle portion of the flexible hose H.
【００１０】図２に示すように、チェックバルブＶは概
略円筒形状を有する合成樹脂製のバルブハウジング１を
備える。バルブハウジング１は、負圧ブースタＢ側に位
置するフロントハウジング２の端部外周に吸気マニホー
ルドＭ側に位置するリヤハウジング３の端部内周を嵌合
させ、その嵌合部の凹凸係合により一体に結合して成
る。As shown in FIG. 2, the check valve V includes a valve housing 1 made of synthetic resin and having a substantially cylindrical shape. In the valve housing 1, the inner periphery of the end of the rear housing 3 located on the intake manifold M side is fitted to the outer periphery of the end of the front housing 2 located on the negative pressure booster B side, and is integrally formed by the concavo-convex engagement of the fitting part. Combined with.
【００１１】図３を併せて参照すると明らかなように、
フロントハウジング２は段付き円筒状の本体部２1 と、
その中心を軸方向に延びる円筒状のベアリング部２
2 と、前記本体部２1 とベアリング部２2 とを接続する
ように９０°間隔で半径方向に延びる４枚のリブ２3 と
を備え、それら本体部２1 、ベアリング部２2 、および
リブ２3 に囲まれて４個の断面扇形の通孔４が形成され
る。バルブハウジング１の内部に収納されるバルブサポ
ート５は、前記フロントハウジング２のベアリング部２
2 に摺動自在に支持される軸部５1 と、この軸部５1 に
段部５2 を介して連設された頭部５3 とを備える。前記
段部５2 と頭部５3 との間にはゴム製の弁体６が嵌合保
持され、この弁体６をフロントハウジング２の端部に形
成した弁座２4 に着座させるべく、リヤハウジング３と
バルブサポート５の頭部５3 との間にスプリング７が縮
設される。As can be seen by referring to FIG. 3 together,
The front housing 2 has a stepped cylindrical main body 2 1
Cylindrical bearing part 2 extending in the axial direction at its center
2 and four ribs 2 3 extending in the radial direction at 90 ° intervals so as to connect the main body 2 1 and the bearing 2 2 to each other. The main body 2 1 , the bearing 2 2 and the rib Surrounded by 2 3 are four through-holes 4 having a fan-shaped cross section. The valve support 5 housed inside the valve housing 1 includes a bearing portion 2 of the front housing 2.
It includes a shaft portion 5 1 which is slidably supported by 2 and a head 3 which is continuously provided through the shaft portion 5 1 step portion 5 2. A rubber valve body 6 is fitted and held between the step portion 5 2 and the head portion 5 3, and the valve body 6 is seated on a valve seat 2 4 formed at an end portion of the front housing 2. A spring 7 is contracted between the rear housing 3 and the head portion 5 3 of the valve support 5.
【００１２】図４を併せて参照すると明らかなように、
リヤハウジング３は前記バルブサポート５の頭部５3 を
収納する段付き円筒状の本体部３1 と、その本体部３1
の吸気マニホールドＭ側の端部に同軸に形成された内側
円筒部３2 と、前記本体部３1 と内側円筒部３2 とを接
続するように９０°間隔で半径方向に延びる４枚のリブ
３3 と、吸気マニホールドＭ側の端部の外周に半径方向
外向きに突設された８枚のリブ３4 とを備える。そし
て、前記本体部３1 、内側円筒部３2 、およびリブ３3
に囲まれて４個の断面扇形の通孔８が形成されるととも
に、前記内側円筒部３2 によって断面円形の通孔９が形
成される。外側の８枚のリブ３4 は可撓性ホースＨの内
面に当接し、これにより本体部３1 の吸気マニホールド
Ｍ側の端部外周と可撓性ホースＨとの間に、８個に区画
された断面扇形の空間１０が画成される。As can be seen by referring to FIG. 4 together,
The rear housing 3 has a stepped cylindrical main body 3 1 for accommodating the head 5 3 of the valve support 5, and the main body 3 1
Of the inner cylinder portion 3 2 coaxially formed at the end portion of the intake manifold M side, and four ribs extending in the radial direction at 90 ° intervals so as to connect the main body portion 3 1 and the inner cylindrical portion 3 2. 3 3 and eight ribs 3 4 protruding outward in the radial direction on the outer periphery of the end portion on the intake manifold M side. Then, the main body portion 3 1, the inner cylindrical portion 3 2, and the ribs 3 3
With four cross sectorial hole 8 is surrounded by the formation, the inner cylindrical portion 3 2 by a circular cross-section of hole 9 is formed. The eight ribs 3 4 of the outer contact with the inner surface of the flexible hose H, thereby between the outer circumference of the end portion of the intake manifold M of the main body portion 3 1 and the flexible hose H, partitioned into eight A space 10 having a fan-shaped cross section is defined.
【００１３】次に、前述の構成を備えた本考案の実施例
の作用を説明する。Next, the operation of the embodiment of the present invention having the above construction will be described.
【００１４】内燃機関の運転に伴って吸気マニホールド
Ｍの内部に負圧が発生すると、可撓性ホースＨの中間部
に介装したチェックバルブＶのリヤハウジング３側すな
わち吸気マニホールドＭ側が低圧になり、フロントハウ
ジング２側すなわち負圧ブースタＢ側との間に圧力差が
生じる。すると軸部５1 をフロントハウジング２のベア
リング部２2 に案内されたバルブサポート５がスプリン
グ７に抗して摺動し、弁体６が弁座２4 から離間する。
その結果、負圧ブースタＢ内部の空気がフロントハウジ
ング２の通孔４、弁体６と弁座２4 間の隙間、およびリ
ヤハウジング３の通孔８，９を介して吸気マニホールド
Ｍ側に吸引され、負圧ブースタＢの負圧室は減圧され
る。吸気マニホールドＭ内部の圧力が上昇して前記圧力
差が減少するとスプリング７の弾発力で弁体６が弁座２
4 に着座し、負圧ブースタＢ内部は負圧状態に維持され
る。而して、吸気マニホールドＭの内部に強い負圧が発
生する度にチェックバルブＶが開弁し、負圧ブースタＢ
内部は更に減圧される。When a negative pressure is generated inside the intake manifold M due to the operation of the internal combustion engine, the pressure on the rear housing 3 side of the check valve V provided in the middle portion of the flexible hose H, that is, the intake manifold M side, becomes low. , A pressure difference occurs between the front housing 2 side, that is, the negative pressure booster B side. Then the valve support 5 which is guided a shaft portion 5 1 a bearing part 2 2 of the front housing 2 slides against the spring 7, the valve element 6 is separated from the valve seat 2 4.
Suction Consequently, the vacuum booster B inside the air hole 4 of the front housing 2, the valve body 6 and the valve seat 2 4 between the gap, and the intake manifold M side through the hole 8, 9 of the rear housing 3 Then, the negative pressure chamber of the negative pressure booster B is depressurized. When the pressure inside the intake manifold M rises and the pressure difference decreases, the elastic force of the spring 7 causes the valve body 6 to move to the valve seat 2
Seated at 4 , the inside of the negative pressure booster B is maintained in a negative pressure state. Whenever a strong negative pressure is generated inside the intake manifold M, the check valve V opens and the negative pressure booster B is opened.
The inside is further depressurized.
【００１５】さて、吸気マニホールドＭから可撓性ホー
スＨにガソリン混合気が侵入して液化すると、そのガソ
リンは可撓性ホースＨの内壁を伝ってチェックバルブＶ
に流入しようとする。しかしながら、吸気マニホールド
Ｍ側に位置するリヤハウジング３の端部外周と可撓性ホ
ースＨの内周との間に空間１０が形成されているため、
ガソリンは前記空間１０に捕捉されてチェックバルブＶ
内部への流入を阻止される。このように、チェックバル
ブＶの手前位置でガソリンを捕捉して負圧ブースタＢへ
の流入を防止しているので、負圧ブースタＢの内部に設
けられたゴム部材等の損傷を未然に回避することができ
る。空間１０に溜まったガソリンはやがて蒸発し、再び
吸気マニホールドＭに吸引されて内燃機関に供給され
る。When the gasoline mixture enters the flexible hose H from the intake manifold M and is liquefied, the gasoline travels along the inner wall of the flexible hose H and the check valve V.
Try to flow into. However, since the space 10 is formed between the outer circumference of the end of the rear housing 3 located on the intake manifold M side and the inner circumference of the flexible hose H,
Gasoline is trapped in the space 10 and the check valve V
Inflow is blocked. As described above, since the gasoline is captured at the position before the check valve V to prevent the gasoline from flowing into the negative pressure booster B, damage to the rubber member and the like provided inside the negative pressure booster B is avoided in advance. be able to. The gasoline accumulated in the space 10 eventually evaporates, is again sucked into the intake manifold M, and is supplied to the internal combustion engine.
【００１６】図５および図６は本考案の第２実施例を示
すものである。5 and 6 show a second embodiment of the present invention.
【００１７】この実施例では、負圧ブースタＢに接続さ
れる可撓性ホースＨ1 と吸気マニホールドＭに接続され
る可撓性ホースＨ2 との間にチェックバルブＶが装着さ
れる。チェックバルブＶのバルブハウジング１は溶着に
より一体に結合されたフロントハウジング２とリヤハウ
ジング３とを備え、フロントハウジング２の継手部２5
とリヤハウジング３の継手部３5 とに、それぞれ前記可
撓性ホースＨ1 ，Ｈ2が挿入されてホースバンド１１で
固定される。In this embodiment, a check valve V is mounted between the flexible hose H 1 connected to the negative pressure booster B and the flexible hose H 2 connected to the intake manifold M. The valve housing 1 of the check valve V includes a front housing 2 and a rear housing 3 which are integrally joined by welding, and a joint portion 2 5 of the front housing 2 is provided.
And to the joint portion 35 of the rear housing 3, respectively the flexible hose H 1, H 2 are fixed by a hose band 11 is inserted.
【００１８】バルブハウジング１に収納されるバルブサ
ポート５の軸部５1 は断面十字形に形成され、その軸部
５1 を摺動自在に案内するフロントハウジング２の通孔
１２の内周との間に空気が流通する隙間が確保される。
バルブサポート５に支持した弁体６をフロントハウジン
グ２に形成した弁座２4 に着座させるべく、リヤハウジ
ング３とバルブサポート５との間にスプリング７が縮設
される。バルブサポート５の頭部５3 には４個の突起５
4 が突設され、弁体６が弁座２4 から離間した時、前記
頭部５3 がリヤハウジング３の通孔１３を閉塞しないよ
うになっている。The shaft portion 5 1 of the valve support 5 housed in the valve housing 1 is formed in a cross shape in cross section, and is formed with the inner periphery of the through hole 12 of the front housing 2 for slidably guiding the shaft portion 5 1 . A space is provided between which air flows.
In order to seat the valve body 6 which is supported on the valve support 5 in the front housing 2 a valve seat 2 4 formed, the spring 7 is mounted under compression between the rear housing 3 and the valve support 5. The head 5 3 of the valve support 5 has four protrusions 5
4 , the head portion 5 3 does not block the through hole 13 of the rear housing 3 when the valve body 6 is separated from the valve seat 2 4 .
【００１９】リヤハウジング３の継手部３5 の先端外周
には９０°間隔で４個のリブ３4 が半径方向に突設さ
れ、このリブ３4 に当接する可撓性ホースＨ2 の内壁と
の間にガソリンを捕捉するための４個の空間１０が形成
される。Four ribs 3 4 are provided in a radial direction on the outer periphery of the front end of the joint portion 3 5 of the rear housing 3 at intervals of 90 °, and the inner wall of the flexible hose H 2 which abuts on the ribs 3 4. Four spaces 10 for capturing gasoline are formed between them.
【００２０】而して、この第２実施例によっても上述の
第１実施例と同様の作用効果を達成することが可能であ
る。Therefore, the second embodiment can also achieve the same effect as that of the first embodiment.
【００２１】以上、本考案の実施例を詳述したが、本考
案は前記実施例に限定されるものでなく、種々の小設計
変更を行うことが可能である。Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various small design changes can be made.
【００２２】[0022]
【考案の効果】以上のように本考案によれば、バルブハ
ウジングの吸気マニホールド側の端部外周面に突設した
リブを可撓性ホースの内周面に当接させることにより、
吸気マニホールドの外周面と可撓性ホースの内周面との
間に空間を形成したので、吸気マニホールド側から流入
したガソリンを前記空間で捕捉して、そのガソリンがチ
ェックバルブを通って負圧ブースタに流入する不都合を
回避することができる。しかもバルブハウジングの外周
にリブを突設するだけの極めて簡単な構造であるため、
極めて低コストで実現可能であり、経時変化によって性
能が低下する虞も無い。As described above, according to the present invention, the rib protruding from the outer peripheral surface of the intake manifold side of the valve housing is brought into contact with the inner peripheral surface of the flexible hose.
Since a space is formed between the outer peripheral surface of the intake manifold and the inner peripheral surface of the flexible hose, the gasoline that flows in from the intake manifold side is captured in the space, and the gasoline passes through the check valve and the negative pressure booster. It is possible to avoid the inconvenience of flowing into. Moreover, because it is an extremely simple structure that only ribs are provided on the outer periphery of the valve housing,
It can be realized at an extremely low cost, and there is no fear that the performance will deteriorate due to aging.
【図１】第１実施例によるチェックバルブの使用状態を
示す図FIG. 1 is a diagram showing a usage state of a check valve according to a first embodiment.
【図２】図１の要部拡大断面図（図４の２−２断面図）FIG. 2 is an enlarged sectional view of an essential part of FIG. 1 (2-2 sectional view of FIG. 4).
【図３】図２の３方向矢視図FIG. 3 is a three-direction arrow view of FIG.
【図４】図２の４−４線断面図FIG. 4 is a sectional view taken along line 4-4 of FIG.
【図５】第２実施例のよるチェックバルブの断面図FIG. 5 is a sectional view of a check valve according to a second embodiment.
【図６】図５の６−６線断面図6 is a sectional view taken along line 6-6 of FIG.
１ バルブハウジング ３4 リブ １０ 空間 Ｂ 負圧ブースタ Ｈ 可撓性ホース Ｈ1 可撓性ホース Ｈ2 可撓性ホース Ｍ 吸気マニホールド1 Valve Housing 3 4 Rib 10 Space B Negative Pressure Booster H Flexible Hose H 1 Flexible Hose H 2 Flexible Hose M Intake Manifold
Claims (1)
圧ブースタ（Ｂ）とを接続する可撓性ホース（Ｈ，
Ｈ1 ，Ｈ2 ）の中間部に介装され、吸気マニホールド
（Ｍ）から負圧ブースタ（Ｂ）への流体の移動を規制す
る負圧ブースタ用チェックバルブにおいて、 バルブハウジング（１）の吸気マニホールド（Ｍ）側の
端部外周面に可撓性ホース（Ｈ，Ｈ2 ）の内周面に当接
するリブ（３4 ）を突設し、前記バルブハウジング
（１）の端部外周面と前記可撓性ホース（Ｈ，Ｈ2 ）の
内周面との間に空間（１０）を形成したことを特徴とす
る負圧ブースタ用チェックバルブ。1. A flexible hose (H,) connecting an intake manifold (M) of an internal combustion engine and a negative pressure booster (B).
A check valve for a negative pressure booster, which is interposed in an intermediate portion of H 1 and H 2 ) and restricts the movement of fluid from the intake manifold (M) to the negative pressure booster (B), in the intake manifold of the valve housing (1). A rib (3 4 ) that abuts on the inner peripheral surface of the flexible hose (H, H 2 ) is provided on the outer peripheral surface of the end on the (M) side, and the outer peripheral surface of the valve housing (1) and the outer peripheral surface of the end are A check valve for a negative pressure booster, characterized in that a space (10) is formed between the flexible hose (H, H 2 ) and the inner peripheral surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP675692U JPH0638776Y2 (en) | 1992-02-19 | 1992-02-19 | Check valve for negative pressure booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP675692U JPH0638776Y2 (en) | 1992-02-19 | 1992-02-19 | Check valve for negative pressure booster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0610670U JPH0610670U (en) | 1994-02-10 |
| JPH0638776Y2 true JPH0638776Y2 (en) | 1994-10-12 |
Family
ID=11647034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP675692U Expired - Lifetime JPH0638776Y2 (en) | 1992-02-19 | 1992-02-19 | Check valve for negative pressure booster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638776Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114665U (en) * | 1978-06-28 | 1980-08-13 | ||
| JP2010249253A (en) * | 2009-04-16 | 2010-11-04 | Fuji Koki Corp | Check valve and flow regulating valve with the same built therein |
| JP7247440B2 (en) * | 2018-11-29 | 2023-03-29 | 信越ポリマー株式会社 | Substrate storage container |
| CN111561620B (en) * | 2020-06-22 | 2020-11-24 | 宁波泰尔汽车部件有限公司 | Low-pressure vacuum tube |
-
1992
- 1992-02-19 JP JP675692U patent/JPH0638776Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0610670U (en) | 1994-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |