JPH0446274A - Sealing device and manufacture thereof - Google Patents
Sealing device and manufacture thereofInfo
- Publication number
- JPH0446274A JPH0446274A JP2152359A JP15235990A JPH0446274A JP H0446274 A JPH0446274 A JP H0446274A JP 2152359 A JP2152359 A JP 2152359A JP 15235990 A JP15235990 A JP 15235990A JP H0446274 A JPH0446274 A JP H0446274A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- lip
- pressure
- outer periphery
- lips
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000002788 crimping Methods 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、油圧あるいは空圧シリンダ内のピストンロッ
ド端部等に配置され、軸受機能及び密封機能を発揮する
密封装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealing device that is disposed at the end of a piston rod in a hydraulic or pneumatic cylinder and performs a bearing function and a sealing function.
（従来の技術）
従来のこの種の密封装置としては、たとえば第９図に示
すようなものがある。すなわち、ピストン１００外周に
複数の突起１０１を設け、この突起１０１上に樹脂材製
リング１０２が圧着されている。この突起１０１に樹脂
材製リング１０２を係合させることにより、ピストン１
００をシリンダ１０３内に挿入した際樹脂材製リング１
０２の肉厚が減少しないようにしてシール性および軸受
としての機能を確保している。(Prior Art) As a conventional sealing device of this type, there is one shown in FIG. 9, for example. That is, a plurality of protrusions 101 are provided on the outer periphery of the piston 100, and a resin ring 102 is crimped onto the protrusions 101. By engaging the resin ring 102 with this protrusion 101, the piston 1
00 into the cylinder 103, the resin ring 1
The sealing performance and function as a bearing are ensured by preventing the wall thickness of 02 from decreasing.
さらに樹脂材製リング１０２の密封対象流体側の端部に
は径方向外方へ向って拡開するリップ１０４が設けられ
、さらにこのリップ１０４の内側には弾性部材１０５が
介装され、リップ１０４を径方向外方へ向って押圧して
密封性を高めていた。Further, a lip 104 that expands radially outward is provided at the end of the resin ring 102 on the side of the fluid to be sealed, and an elastic member 105 is interposed inside the lip 104. was pressed radially outward to improve sealing performance.
（発明が解決しようとする課題）
しかしながら上記した従来技術の場合には、図中矢印Ａ
で示す方向に圧力が作用する場合には圧力によるリップ
１０４拡張作用がありシール性が確保されるものの、反
対方向の図中矢印Ｂで示す方向に圧力が作用する場合に
は、弾性部材１０５による拡張力のみであり、高圧にな
った場合にシール性を確保することができなかった。(Problem to be solved by the invention) However, in the case of the above-mentioned prior art, arrow A in the figure
When pressure is applied in the direction indicated by , the lip 104 expands due to the pressure and sealing performance is ensured. However, when pressure is applied in the opposite direction, indicated by arrow B in the figure, the elastic member 105 expands. It was only an expansion force, and it was not possible to ensure sealing performance when high pressure was applied.
本発明は上記した従来技術の課題を解決するためになさ
れたもので、その目的とするところは、ピストンのいず
れの端面側に圧力が作用してもシール性を確保し得る密
封装置およびその製造方法を提供することにある。The present invention has been made in order to solve the problems of the prior art described above, and its purpose is to provide a sealing device that can ensure sealing performance even when pressure is applied to either end surface of a piston, and to manufacture the same. The purpose is to provide a method.
（課題を解決するための手段）
上記目的を達成するために、本発明にあっては、シリン
ダ内周に往復動自在に挿入されるピストン外周に複数の
突起を設け、該突起上に樹脂材製リングを圧着し、該樹
脂材製リングには弾性部材を介して径方向外方へ向って
拡開する方向に押圧されるリップが設けられた密封装置
において、前記リップを樹脂材製リングの軸方向両端に
設けたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, in the present invention, a plurality of protrusions are provided on the outer periphery of the piston that is reciprocatably inserted into the inner periphery of the cylinder, and a resin material is placed on the protrusions. In a sealing device, the resin ring is provided with a lip that is pressed in a direction that expands radially outward via an elastic member. It is characterized by being provided at both ends in the axial direction.
また、本発明に係る密封装置の製造方法は、ピストン外
周のリップ形成部位に設けた装着溝に環状の弾性部材を
取付る工程と、シート圧着手段を介してピストン外周の
突起に樹脂材製のシートを取付ける工程と、シートの一
端をかしめる工程と、シートを取付だピストンを加熱シ
リンダ内に圧入してシートを加熱する工程と、冷却して
からピストンを加熱シリンダから取出す工程と、取出し
たシートのシートかしめ部を切断除去する工程と、を備
えて成ることを特徴とする。Further, the method for manufacturing a sealing device according to the present invention includes a step of attaching an annular elastic member to a mounting groove provided at a lip forming portion on the outer circumference of the piston, and a step of attaching a resin material to a protrusion on the outer circumference of the piston via a sheet pressure bonding means. A process of attaching the seat, a process of caulking one end of the seat, a process of press-fitting the piston with the seat attached into the heating cylinder to heat the seat, a process of taking out the piston from the heating cylinder after cooling, and a process of taking out the piston from the heating cylinder. The method is characterized by comprising the step of cutting and removing the sheet caulked portion of the sheet.
（作用）
上記構成の密封装置にあっては、ピストンの一方側から
圧力が作用する場合には、この圧力により一方のリップ
が拡張作用を受けてシール圧力が土曽犬する。(Function) In the sealing device configured as described above, when pressure is applied from one side of the piston, one lip is expanded by this pressure and the sealing pressure is increased.
また、ピストンの他方側から圧力が作用する場合には、
他方のリップが拡張作用を受けてシール圧力が増大する
。Also, if pressure is applied from the other side of the piston,
The other lip is expanded and the sealing pressure increases.
一方、本発明の製造方法によれば、加熱シリンダ内に圧
入した際に、シートはピストンに加熱シリンダ内にてシ
ートが加熱されて軟化し、ピストン外周の突起に係合す
る。さらに、かしめ部を切断することにより切断した端
部が弾性部材の弾性復元力によって径方向に拡張する方
向に押圧されリップが形成される。On the other hand, according to the manufacturing method of the present invention, when the sheet is press-fitted into the heating cylinder, the sheet is heated and softened by the piston in the heating cylinder, and engages with the protrusion on the outer periphery of the piston. Further, by cutting the caulked portion, the cut end portion is pressed in a direction to expand in the radial direction by the elastic restoring force of the elastic member, thereby forming a lip.
（実施例）
以下に本発明を図示の実施例に基づいて説明する。本発
明の一実施例に係る密封装置を示す第１図において、１
はシリンダ２内周に往復動自在に挿入されるピストンで
あり、このピストン１外周にたとえば四フッ化エチレン
樹脂等の樹脂材製リング３が圧着されている。この樹脂
材製リング３はピストン１外周に設けられた複数の突起
４上に取付けられたもので、突起４は図示例では断面矩
形状で軸方向に所定間隔でもって複数形成されている。(Example) The present invention will be explained below based on the illustrated example. In FIG. 1 showing a sealing device according to an embodiment of the present invention, 1
A piston is inserted into the inner periphery of the cylinder 2 so as to be able to reciprocate, and a ring 3 made of a resin material such as tetrafluoroethylene resin is crimped onto the outer periphery of the piston 1. This resin ring 3 is attached to a plurality of projections 4 provided on the outer periphery of the piston 1, and in the illustrated example, the projections 4 have a rectangular cross section and are formed in plural at predetermined intervals in the axial direction.
このように突起４．・・・に係合させることにより、樹
脂製リング３がピストン１に確実に固着され軸受機能の
向上を図ることができる。In this way, protrusion 4. By engaging with..., the resin ring 3 is reliably fixed to the piston 1, and the bearing function can be improved.
一方、樹脂材製リング３の内周には上記突起４、・・・
・・・が嵌まり込む凹溝５が複数設けられていて、樹脂
材製リング３内周とピストン１外周面が流体密に嵌合し
ている。On the other hand, on the inner periphery of the resin ring 3, the projections 4,...
A plurality of concave grooves 5 are provided into which the piston 1 is fitted, and the inner periphery of the resin ring 3 and the outer periphery of the piston 1 are fluid-tightly fitted.
そして、この樹脂材製リング３の軸方向両端部には、径
方向外方に向って拡開する第１．第２リツプ６．７がそ
れぞれ設けられている。At both axial end portions of this resin ring 3, there are first grooves that expand outward in the radial direction. A second lip 6.7 is provided respectively.
この第１．第２リツプ６．７は先端に向って徐々に拡が
るように傾斜しており、ピストン１で隔てられる両側の
第１、第２室Ｓ＋、Ｓｚに向ってそれぞれ開いた形状と
なっている。This first. The second lip 6.7 is inclined so as to gradually widen toward the tip, and has a shape that opens toward the first and second chambers S+ and Sz on both sides separated by the piston 1, respectively.
これら第１．第２リツプ６．７の内側には、第１、第２
リツプ６．７を径方向に拡開する方向に押圧するＯリン
グ等の環状弾性部材８．９が設けられている。この第１
．第２弾性部材８．９はそれぞれピストン１外周に設け
られた第１．第２装着溝１０：１１に装着されている。These first. Inside the second lip 6.7 are the first and second lips.
An annular elastic member 8.9, such as an O-ring, is provided which presses the lip 6.7 in the direction of radial expansion. This first
．． The second elastic members 8 and 9 are each provided with a first elastic member provided on the outer periphery of the piston 1. It is mounted in the second mounting groove 10:11.
このように樹脂材製リング３の両端部に第１゜第２リツ
プ６．７を形成したことにより、一方の第１室Ｓ１内か
ら圧力を受ける場合にはこの第１室Ｓ工に向って開く第
１リツプ６に拡張力が作用し、シリンダ２内周とのシー
ル面圧を高める。また他方の第２室Ｓ２内から圧力を受
ける場合には、この第２室Ｓ２に向って開いた第２リツ
プ７に拡張力が作用してシール面圧を高め、両側からの
圧力に対してシール性を高めることができる。そして、
各第１．第２リツプ６．７を押圧する第１、第２弾性部
材８．９を有しているので、圧力が低い場合でも充分な
密封圧力を負荷することができる。By forming the first and second lips 6.7 on both ends of the resin ring 3 in this way, when pressure is applied from within one of the first chambers S1, it is possible to direct the pressure toward the first chamber S. Expansion force acts on the opening first lip 6, increasing the sealing surface pressure with the inner circumference of the cylinder 2. In addition, when pressure is received from inside the other second chamber S2, expansion force acts on the second lip 7 that opens toward the second chamber S2, increasing the sealing surface pressure and resisting the pressure from both sides. Sealing performance can be improved. and,
Each 1st. Since it has the first and second elastic members 8.9 that press against the second lip 6.7, sufficient sealing pressure can be applied even when the pressure is low.
第２図乃至第８図には本発明の密封装置の製造方法を示
している。2 to 8 show a method of manufacturing the sealing device of the present invention.
まず、第２図に示すようにピストン１の第１゜第２装着
溝１０．１１に環状の第１．第２弾性部材８，９を装着
する。First, as shown in FIG. 2, an annular first groove is formed in the first and second mounting grooves 10. The second elastic members 8 and 9 are attached.
次いで、第３図に示すようにピストン１外周に樹脂材製
のシート２０を取付ける。Next, as shown in FIG. 3, a resin sheet 20 is attached to the outer periphery of the piston 1.
このシート２０の取付は、たとえば本出願人が既に出願
している公知の装置構成（特開昭６１−８２０７２号公
報参照）によって行なわれる。概略的に説明すると第４
図に示すようなテーバ治具２１を用い、このテーバ治具
２１によってワッシャ状に成形した素材のシート２０の
内径を拡開させながら徐々に円筒状に成形してピストン
１外周に装着する。シート２０をテーバ治具２１表面に
沿って拡げる方法は、たとえば可撓性の板状体２２によ
ってシート２０をピストン１外周面に押圧する方法等よ
り行なう。The attachment of the sheet 20 is carried out, for example, by a known device configuration (see Japanese Patent Application Laid-open No. 82072/1982) which has already been filed by the present applicant. To summarize, the fourth
Using a Taber jig 21 as shown in the figure, a sheet 20 of material formed into a washer shape is gradually formed into a cylindrical shape while expanding the inner diameter thereof and is attached to the outer periphery of the piston 1. The sheet 20 is spread along the surface of the Taber jig 21 by, for example, pressing the sheet 20 against the outer peripheral surface of the piston 1 using a flexible plate-like member 22.
シート２０をピストン１外周に取付けた後、スピンドル
２３によりシート２０の上端をかしめ、このかしめ部２
４をピストン１上端に設けた係合溝２５に係合させる。After attaching the seat 20 to the outer periphery of the piston 1, the upper end of the seat 20 is caulked by the spindle 23, and this caulked portion 2
4 is engaged with the engagement groove 25 provided at the upper end of the piston 1.
次に、第５図に示すようにシート２０を取付けた状態で
第Ｃ図に示すような加熱シリンダ２６内に圧太し、シー
ト２０を軟化させてピストン１外周の突起４、・・・に
シート２０内周を食い付かせてシート内周形状をピスト
ン１外周形状に放った形状に成形する。Next, with the seat 20 attached as shown in FIG. 5, the seat 20 is compressed into a heating cylinder 26 as shown in FIG. The inner periphery of the seat 20 is bitten to form the inner periphery of the seat into a shape that radiates from the outer periphery of the piston 1.
その後第６図に示すように冷却シリンダ２７内を通して
冷却後ピストン１を取り出す。Thereafter, as shown in FIG. 6, the piston 1 is taken out after cooling through the cooling cylinder 27.
この状態では、第７図に示すように、シート２０のかし
め部２４と反対側の端部が、第２装着溝１１内の第２弾
性部材１１の弾性復元力によって押し上げられ、径方向
外方に向って拡開する第２リツプ７となる。In this state, as shown in FIG. 7, the end of the seat 20 opposite to the caulking portion 24 is pushed up by the elastic restoring force of the second elastic member 11 in the second mounting groove 11, and is pushed outward in the radial direction. This becomes a second lip 7 that expands towards the end.
次に、かしめ部２４を切断除去することにより、第８図
に示すように切断された端部が第１装着溝１０内の第１
弾性部材８の弾性復元力によって径方向外方に向って押
圧され、径方向外方に向って拡開する第１リツプ６が形
成される。Next, by cutting and removing the caulked portion 24, the cut end portion is placed in the first mounting groove 10 as shown in FIG.
A first lip 6 is formed which is pressed radially outward by the elastic restoring force of the elastic member 8 and expands radially outward.
また、他の実施例として、第８図中斜線で示すピストン
】外周のシートかしめ部２４が係合する係合溝２５が設
けられた係合部位２８は、ピストン１としては不要部分
なので、この係合部位２８を脱着可能に治具化して製作
する方法をとることもできる。In addition, as another embodiment, the engagement part 28 shown by diagonal lines in FIG. It is also possible to manufacture the engaging portion 28 as a removable jig.
（発明の効果）
本発明は以下の構成及び作用を有するもので、ピストン
外周に圧着した樹脂製リングの両端部にリップを形成し
たので、ピストンの両側のいづれの方向から圧力が作用
しても、いづれかのリップを拡開させることができ、良
好なシール性を確保することができる。(Effects of the Invention) The present invention has the following structure and function. Lips are formed at both ends of the resin ring crimped to the outer periphery of the piston, so that pressure can be applied from either side of the piston. , either lip can be expanded, and good sealing performance can be ensured.
また本発明の製造方法によれば、極めて簡単に本発明の
密封装置を製造することができる。Further, according to the manufacturing method of the present invention, the sealing device of the present invention can be manufactured extremely easily.
第１図は本発明の一実施例に係る密封装置の半縦断面図
、第２図乃至第８図は本発明の密封装置の製造方法の各
工程を示すもので、第２図はピストン外周に環状の弾性
部材を取付だ半断面図、第３図はピストン外周にシート
を取付だ状態の半縦断面図、第４図はピストン外周にシ
ートを取り付ける装置構成を示す縦断面図、第５図は第
３図のシートの一端をかしめた状態の半縦断面図、第６
図は加熱シリンダに圧入する工程を示す加熱シリンダの
装置構成を示す縦断面図、第７図は加熱却ピストンを取
出した状態の半縦断面図、第８図はかしめ部をカットし
た状態の半縦断面図、第図は従来の密封装置の半縦断面
図である。
符号の説明
１・・・ピストン ２・・・シリンダ３・・・
樹脂材製リング ４・・・突起５・・・凹溝
６・・・第１リツプ Ｓ、・・・第１室７・・・
第２リツプ Ｓ２・・・第２室８・・・第１弾性
部材 ９・・・第２弾性部材１０・・・第１装着溝
１１・・・第２装着溝２０・・・シート ２
１・・・テーパ治具２２・・・板状体 ２３・・
・スピンドル２４・・・かしめ部 ２５・・・係合
溝２６・・・加熱シリンダ ２７・・・冷却シリンダ２
８・・・係合部位FIG. 1 is a half-longitudinal cross-sectional view of a sealing device according to an embodiment of the present invention, FIGS. FIG. 3 is a half-sectional view of a state in which an annular elastic member is attached to the outer periphery of the piston, FIG. The figure is a half-longitudinal cross-sectional view of the sheet shown in Figure 3 with one end caulked, and the sheet shown in Figure 6.
The figure is a vertical cross-sectional view showing the device configuration of the heating cylinder showing the process of press-fitting it into the heating cylinder, Figure 7 is a half-longitudinal cross-sectional view with the heating piston removed, and Figure 8 is a half-longitudinal view with the caulked part cut. Longitudinal sectional view, FIG. 1 is a half-longitudinal sectional view of a conventional sealing device. Explanation of symbols 1...Piston 2...Cylinder 3...
Resin ring 4...Protrusion 5...Concave groove 6...First lip S,...First chamber 7...
Second lip S2...Second chamber 8...First elastic member 9...Second elastic member 10...First mounting groove 11...Second mounting groove 20...Seat 2
1... Taper jig 22... Plate-shaped body 23...
・Spindle 24...Caulking part 25...Engagement groove 26...Heating cylinder 27...Cooling cylinder 2
8... Engagement part
Claims (2)
外周に複数の突起を設け、該突起上に樹脂材製リングを
圧着し、該樹脂材製リングには弾性部材を介して径方向
外方へ向つて拡開する方向に押圧されるリップが設けら
れた密封装置において、 前記リップを樹脂材製リングの軸方向両端 に設けたことを特徴とする密封装置。(1) A plurality of protrusions are provided on the outer periphery of the piston that is inserted into the inner periphery of the cylinder so as to be able to reciprocate, and a resin ring is crimped onto the protrusions. What is claimed is: 1. A sealing device provided with a lip that is pressed in a direction that expands toward the front, characterized in that the lips are provided at both ends in the axial direction of a ring made of a resin material.
環状の弾性部材を取付る工程と、 シート圧着手段を介してピストン外周の突 起に樹脂材製のシートを取付ける工程と、 シートの一端をかしめる工程と、 シートを取付たピストンを加熱シリンダ内 に圧入してシートを加熱する工程と、 冷却してからピストンを加熱シリンダから 取出す工程と、 取出したシートのシートかしめ部を切断除 去する工程と、を備えて成ることを特徴とする密封装置
の製造方法。(2) A step of attaching an annular elastic member to a mounting groove provided in a lip forming area on the outer periphery of the piston, a step of attaching a resin sheet to a protrusion on the outer periphery of the piston via a sheet crimping means, and a step of attaching one end of the sheet to a protrusion on the outer periphery of the piston. A process of crimping, a process of pressing the piston with the seat attached into the heating cylinder to heat the seat, a process of taking out the piston from the heating cylinder after cooling, a process of cutting and removing the seat crimped part of the taken out sheet. A method for manufacturing a sealing device, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152359A JP3002891B2 (en) | 1990-06-11 | 1990-06-11 | Manufacturing method of sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152359A JP3002891B2 (en) | 1990-06-11 | 1990-06-11 | Manufacturing method of sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0446274A true JPH0446274A (en) | 1992-02-17 |
| JP3002891B2 JP3002891B2 (en) | 2000-01-24 |
Family
ID=15538821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2152359A Expired - Fee Related JP3002891B2 (en) | 1990-06-11 | 1990-06-11 | Manufacturing method of sealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3002891B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248003A (en) * | 1998-03-05 | 1999-09-14 | Nok Corp | Sealing device |
| JP2010534812A (en) * | 2007-07-30 | 2010-11-11 | ゲーカーエン シンター メタルズ ホールディング ゲーエムベーハー | Piston for piston cylinder device and manufacturing method |
| JP2015510570A (en) * | 2012-02-20 | 2015-04-09 | トレルボルグ シーリング ソリューションズ ジャーマニー ゲーエムベーハーＴｒｅｌｌｅｂｏｒｇ Ｓｅａｌｉｎｇ Ｓｏｌｕｔｉｏｎｓ Ｇｅｒｍａｎｙ ＧｍｂＨ | SEALING DEVICE AND SEALING DEVICE MANUFACTURING METHOD |
| WO2016034474A1 (en) * | 2014-09-01 | 2016-03-10 | Trelleborg Sealing Solutions Germany Gmbh | Sealing arrangement with pressure-activatable pre-tensioning element |
-
1990
- 1990-06-11 JP JP2152359A patent/JP3002891B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248003A (en) * | 1998-03-05 | 1999-09-14 | Nok Corp | Sealing device |
| JP2010534812A (en) * | 2007-07-30 | 2010-11-11 | ゲーカーエン シンター メタルズ ホールディング ゲーエムベーハー | Piston for piston cylinder device and manufacturing method |
| JP2015510570A (en) * | 2012-02-20 | 2015-04-09 | トレルボルグ シーリング ソリューションズ ジャーマニー ゲーエムベーハーＴｒｅｌｌｅｂｏｒｇ Ｓｅａｌｉｎｇ Ｓｏｌｕｔｉｏｎｓ Ｇｅｒｍａｎｙ ＧｍｂＨ | SEALING DEVICE AND SEALING DEVICE MANUFACTURING METHOD |
| WO2016034474A1 (en) * | 2014-09-01 | 2016-03-10 | Trelleborg Sealing Solutions Germany Gmbh | Sealing arrangement with pressure-activatable pre-tensioning element |
| US10088051B2 (en) | 2014-09-01 | 2018-10-02 | Trelleborg Sealing Solutions Germany Gmbh | Sealing arrangement with pressure-activatable pretensioning element |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3002891B2 (en) | 2000-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |