JP2503134Y2 - Vertical overhead valve type internal combustion engine - Google Patents
Vertical overhead valve type internal combustion engineInfo
- Publication number
- JP2503134Y2 JP2503134Y2 JP1990030493U JP3049390U JP2503134Y2 JP 2503134 Y2 JP2503134 Y2 JP 2503134Y2 JP 1990030493 U JP1990030493 U JP 1990030493U JP 3049390 U JP3049390 U JP 3049390U JP 2503134 Y2 JP2503134 Y2 JP 2503134Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- cylinder head
- exhaust
- intake
- internal combustion
- 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 - Fee Related
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、クランク軸を垂直に設けた縦型頭上弁式内
燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vertical overhead valve internal combustion engine in which a crankshaft is provided vertically.
第４図乃至第６図に従来の縦型頭上弁式内燃機関の１
例を示す。図において、１はシリンダバレル1A、シリン
ダヘッド1Bおよびヘッドカバー1Cから成り、シリンダバ
レル1Aの中心線が水平であるシリンダブロック、２はそ
のシリンダブロック１のシリンダバレル1Aと一体成形さ
れているクランクケースで、そのクランクケース２の中
央に、軸受３を介してクランク軸４が垂直に支持されて
いる。５はピストン、６はコンロッドである。FIGS. 4 to 6 show a conventional vertical overhead valve internal combustion engine 1
Here is an example. In the figure, reference numeral 1 is a cylinder block having a cylinder barrel 1A, a cylinder head 1B and a head cover 1C, and the center line of the cylinder barrel 1A is horizontal, and 2 is a crankcase integrally formed with the cylinder barrel 1A of the cylinder block 1. At the center of the crankcase 2, a crankshaft 4 is vertically supported via a bearing 3. 5 is a piston and 6 is a connecting rod.
上記シリンダヘッド1Bに吸気弁７と排気弁８がオーバ
ヘッドバルブ（頭上弁）式に配置されていて、その吸気
弁７および排気弁８はクランク軸４に同期して回転する
カム軸９（第５図示）、そのカム軸９の回転によって直
線往復動させられる上下一対のプッシュロッド107,10
8、各プッシュロッド107,108の作動によって揺動させら
れる一対のロッカアーム117,118、各弁7,8に設けた戻し
ばね127から成る動弁機構を備えている。An intake valve 7 and an exhaust valve 8 are arranged in the cylinder head 1B in an overhead valve (overhead valve) type, and the intake valve 7 and the exhaust valve 8 rotate in synchronization with a crankshaft 4 (a fifth shaft). (Shown), a pair of upper and lower push rods 107 and 10 which are linearly reciprocated by the rotation of the cam shaft 9.
8, a pair of rocker arms 117 and 118 that are swung by the operation of the push rods 107 and 108, and a valve operating mechanism that includes a return spring 127 provided in each of the valves 7 and 8.
そしてヘッドカバー1Cの側から見てシリンダヘッド1B
の右側面に吸気孔137が、左側面に排気孔138がそれぞれ
開口している。すなわち吸気と排気がクロスフローする
形に吸気孔137と排気孔138を設けている。And the cylinder head 1B viewed from the side of the head cover 1C
An intake hole 137 is opened on the right side surface and an exhaust hole 138 is opened on the left side surface. That is, the intake hole 137 and the exhaust hole 138 are provided so that the intake and the exhaust cross flow.
上記吸気弁７と排気弁８は、共通の垂直面内に上下平
行に、吸気弁７の方を上側にして配置している。吸気孔
137は、吸気弁用プッシュロッド107と排気弁用プッシュ
ロッド108の間を通っていて、吸気弁７の方に向って略
直線状に上り勾配になっている。The intake valve 7 and the exhaust valve 8 are arranged in parallel in the same vertical plane with the intake valve 7 facing upward. Intake hole
137 passes between the intake valve push rod 107 and the exhaust valve push rod 108, and has a substantially straight upward slope toward the intake valve 7.
第６図に示すように、上記シリンダヘッド1Bの吸気孔
137の開口の底部は、その反対側の排気孔138の開口の頂
部より低い位置にある。As shown in FIG. 6, the intake hole of the cylinder head 1B
The bottom of the opening of 137 is lower than the top of the opening of the exhaust hole 138 on the opposite side.
従って上記各開口におけるキャブレータの接続部とマ
フラーの接続部は略同じ高さとなっている。Therefore, the carburetor connecting portion and the muffler connecting portion in each of the openings have substantially the same height.
上記吸気孔137の開口に直接気化器14が、更にその気
化器14にエアクリーナ15が、また排気孔138の開口にマ
フラー16がそれぞれ接続されている。17は気化器14とエ
アクリーナ15をつなぐエルボ、18はエアクリーナエレメ
ントである。A carburetor 14 is directly connected to the opening of the intake hole 137, an air cleaner 15 is connected to the carburetor 14, and a muffler 16 is connected to the opening of the exhaust hole 138. 17 is an elbow that connects the carburetor 14 and the air cleaner 15, and 18 is an air cleaner element.
シリンダブロック１、クランクケース２の上方を覆う
ように導風カバー19が取付けられていて、その中にクラ
ンク軸４と一体のフライホイール20およびファン21が位
置している。22はリコイルスタータ、23は燃料タンクで
ある。スパークプラグ24、スタータモータ25はマフラー
16と同じ側に配置されている。An air guide cover 19 is attached so as to cover the cylinder block 1 and the crankcase 2 from above, and a flywheel 20 and a fan 21 integrated with the crankshaft 4 are located therein. 22 is a recoil starter, and 23 is a fuel tank. Muffler for spark plug 24 and starter motor 25
Located on the same side as 16.
〔考案が解決しようとする課題〕 スパークプラグ24の設置個所に制約がある。即ち、吸
・排気ポートをシリンダヘッドの両側方に開口すると、
シリンダヘッドに挿入する点火プラグの着脱方向を、機
関運転により排気熱で高温となる横方向への排気ポート
に対してなるべく上側へ大きな角度をとるようにしてメ
ンテナンスを容易とする必要があることから、点火プラ
グの配置個所が制約を受ける。[Problems to be solved by the invention] There are restrictions on the installation location of the spark plug 24. That is, if the intake / exhaust ports are opened on both sides of the cylinder head,
Since it is necessary to make the ignition plug to be inserted into and removed from the cylinder head a large angle toward the upper side of the exhaust port in the lateral direction where the engine heats up to high temperature due to exhaust heat to facilitate maintenance. The location of the spark plug is restricted.
シリンダヘッド燃焼室部を充分冷却出来ない。The cylinder head combustion chamber cannot be cooled sufficiently.
排気系が冷却風の風下となるため冷却しにくく、排気
弁部までの冷却が不可能となる。このため、シリンダヘ
ッド内に固定されているバルブガイドとシリンダヘッド
の熱膨張差等により、バルブガイドが脱落する可能性が
ある。Since the exhaust system is downwind of the cooling air, it is difficult to cool it, and it is impossible to cool the exhaust valve portion. Therefore, the valve guide may drop out due to a difference in thermal expansion between the valve guide fixed in the cylinder head and the cylinder head.
吸気孔が上り勾配のため液滴状燃料が気化器側へ逆流
し易い。Since the intake hole has an upward gradient, the liquid fuel easily flows back to the carburetor side.
クランク軸を垂直に、シリンダを水平に向けた縦型頭
上弁式内燃機関であって、かつシリンダの一側方に気化
器を同気化器に対向してマフラーを配置した内燃機関に
於いて、吸気弁を下方に排気弁を吸気弁よりも上方にそ
れぞれ配置し、シリンダヘッドの一側面に、前記吸気弁
に向って吸気孔を開口し、気化器を接続すると共に、前
記排気弁と排気孔とを結ぶ線が水平線に対し上方から斜
交するように同排気孔をシリンダヘッドの上面側に開口
する。また、同排気孔にシリンダヘッド上面側から側面
にかけて屈曲された形状のマフラーを直接取付け、同マ
フラーに冷却風ガイドの機能を持たせる。A vertical overhead valve internal combustion engine in which the crankshaft is oriented vertically and the cylinder is oriented horizontally, and an internal combustion engine in which a muffler is arranged on one side of the cylinder with a carburetor facing the carburetor, An intake valve is disposed below and an exhaust valve is disposed above the intake valve. An intake hole is opened on one side surface of the cylinder head toward the intake valve to connect a carburetor, and the exhaust valve and the exhaust hole are connected. The exhaust hole is opened on the upper surface side of the cylinder head so that the line connecting to and obliquely intersects with the horizontal line from above. Further, a muffler having a shape bent from the upper surface side to the side surface of the cylinder head is directly attached to the exhaust hole, and the muffler has a function of a cooling air guide.
（１）排気孔をシリンダヘッドの上面、すなわち冷却風
の風上側に開口し、マフラーをシリンダヘッドの左側面
から下方にわん曲させた形状とすることにより、点火プ
ラグの配置の自由度が高くなり、メンテナンスの容易化
が図られる。(1) The exhaust hole is opened on the upper surface of the cylinder head, that is, on the windward side of the cooling air, and the muffler is bent downward from the left side surface of the cylinder head, which increases the degree of freedom in the arrangement of the ignition plug. Therefore, maintenance can be facilitated.
（２）冷却風の流れ（第２図矢印Ａ）に対しシリンダヘ
ッド高温部となる排気孔部が風上側となるため、シリン
ダヘッド全体を効率よく冷却することが出来る。(2) Since the exhaust hole portion, which is the high temperature portion of the cylinder head, is on the windward side with respect to the flow of the cooling air (arrow A in FIG. 2), the entire cylinder head can be efficiently cooled.
（３）前記冷却風は排気弁の周辺に直接当たるため、バ
ルブガイド部の過熱が防止できる。(3) Since the cooling air directly impinges on the periphery of the exhaust valve, overheating of the valve guide portion can be prevented.
（４）シリンダヘッドの排気孔部の長さが従来のものに
比べて短く、マフラーとはガスケットにより断熱するた
め、シリンダヘッド排気側の蓄熱量が少なくてすみ冷却
効果が向上すると共に、マフラーそのものが冷却風ガイ
ドとなっているため、マフラーの冷却も効率良く実施出
来る。(4) Since the length of the exhaust hole of the cylinder head is shorter than that of the conventional one, and the muffler is insulated with a gasket, the amount of heat stored on the exhaust side of the cylinder head is small and the cooling effect is improved and the muffler itself Since it is a cooling air guide, the muffler can be cooled efficiently.
以下第１図乃至第３図を参照して本考案の１実施例に
つき説明する。同図において、51はシリンダブロック
で、シリンダバレル51a、シリンダヘッド51b、ヘッドカ
バー51cから成り、シリンダバレル51aの中心線51dは水
平をなす。An embodiment of the present invention will be described below with reference to FIGS. In the figure, 51 is a cylinder block, which is composed of a cylinder barrel 51a, a cylinder head 51b, and a head cover 51c, and a center line 51d of the cylinder barrel 51a is horizontal.
52,53は吸気弁，排気弁で、シリンダヘッド51bにオー
バヘッドバルブ（頭上弁）式に配置される。Reference numerals 52 and 53 are intake valves and exhaust valves, which are arranged on the cylinder head 51b in an overhead valve (overhead valve) type.
54,55はプッシュロッドで、図示せぬクランク軸に同
期して回転するカム軸の回転によって往復動させられ、
上下一対で構成される。前記カム軸、プッシュロッド5
4,55及び同ロッド54,55の作動によって揺動させられる
一対のロッカーアーム56,57により動弁機構を構成す
る。54 and 55 are push rods, which are reciprocated by the rotation of a cam shaft that rotates in synchronization with a crank shaft (not shown),
It is composed of a pair of top and bottom. The cam shaft and push rod 5
A valve mechanism is constituted by a pair of rocker arms 56, 57 which are rocked by the operation of the rods 4, 55 and the rods 54, 55.
58は吸気孔で、シリンダヘッド51bの側から見て同シ
リンダヘッド51bの右側面に開口し、他端が吸気弁52へ
至っている。また、第１図に示すように、吸気孔壁とシ
リンダ取付壁上面，プッシュロッド穴周壁に囲まれた出
力軸方向に冷却風を通す冷却風穴70が形成されている。Reference numeral 58 is an intake hole, which opens to the right side surface of the cylinder head 51b when viewed from the cylinder head 51b side, and the other end reaches the intake valve 52. Further, as shown in FIG. 1, a cooling air hole 70 is formed surrounded by the intake hole wall, the upper surface of the cylinder mounting wall, and the peripheral wall of the push rod hole for passing cooling air in the output shaft direction.
61は排気孔で、これの中心排気弁53と結ぶ線61aが、
水平線100に対し上方から斜交するように配置されてい
る。尚排気孔61は水平線100に対して直交させてもよ
い。61 is an exhaust hole, and the line 61a connecting to the central exhaust valve 53 of this is
It is arranged so as to be oblique to the horizontal line 100 from above. The exhaust hole 61 may be orthogonal to the horizontal line 100.
また、上記吸気弁52と排気弁53は共通の垂直面内に上
下平行に、吸気弁52の方を下にして配置されている。Further, the intake valve 52 and the exhaust valve 53 are arranged in parallel in the same vertical plane with the intake valve 52 facing downward.
また、吸気孔58は吸気弁用プッシュロッド54と排気弁
用プッシュロッド55の間を通っている。The intake hole 58 passes between the intake valve push rod 54 and the exhaust valve push rod 55.
62は気化器で、ボルト63をシリンダヘッド51bのねじ
穴64に螺合させて、第１図の如くシリンダヘッド51bに
取り付けられる。A vaporizer 62 is attached to the cylinder head 51b by screwing a bolt 63 into a screw hole 64 of the cylinder head 51b as shown in FIG.
65はマフラーで、右本体65aと左本体65bとで構成さ
れ、右本体65aを左本体65bに巻締め等により一体構造と
なっている。同マフラー65はガスケット72を介してシリ
ンダヘッド51bにボルト66及びナット67に固着される。A muffler 65 is composed of a right main body 65a and a left main body 65b. The right main body 65a is wound around the left main body 65b to form an integral structure. The muffler 65 is fixed to a bolt 66 and a nut 67 on the cylinder head 51b via a gasket 72.
68は点火プラグで、ねじ穴69に取付けられる。71はフ
ァンカバー、72はシリンダヘッドガスケットである。68 is a spark plug, which is attached to the screw hole 69. 71 is a fan cover and 72 is a cylinder head gasket.
上記構成を備えた縦型頭上弁式内燃機関の運転時にお
いて、冷却ファン21（第４図示）により送られた冷却風
は、第２図に示すように、ファンカバー71内を矢印Ｂの
ように流れてシリンダブロック部51に至る。この冷却風
はさらにマフラー65のエンジン側の側面65dに案内され
て矢印Ａのように流れて排気孔61を含むシリンダヘッド
51b全体及び点火プラグ68を冷却する。During operation of the vertical overhead valve type internal combustion engine having the above-described configuration, the cooling air sent by the cooling fan 21 (shown in FIG. 4) flows inside the fan cover 71 as indicated by arrow B as shown in FIG. To reach the cylinder block portion 51. The cooling air is further guided by the side surface 65d of the muffler 65 on the engine side and flows as shown by an arrow A to include the exhaust hole 61 in the cylinder head.
The entire 51b and the spark plug 68 are cooled.
本考案は、クランク軸を垂直に、シリンダを水平に向
けた縦型頭上弁式内燃機関であって、かつシリンダの一
側方に気化器を設け、同気化器に対向してマフラーを配
置した内燃機関に於いて、吸気弁を下方に排気弁を吸気
弁よりも上方にそれぞれ配置し、シリンダヘッドの一側
面に吸気弁に向って吸気孔を開口し、同吸気孔に気化器
を接続すると共に、前記排気弁と排気孔とを結ぶ線が水
平線に対し上方から交わる方向に同排気孔をシリンダヘ
ッド上面側に開口し、同排気孔にシリンダヘッド上面側
から側面にかけて屈曲された形状のマフラーを直接取付
けたことにより、次の効果を有する。The present invention is a vertical overhead valve internal combustion engine in which the crankshaft is oriented vertically and the cylinder is oriented horizontally, and a carburetor is provided on one side of the cylinder, and a muffler is disposed facing the carburetor. In an internal combustion engine, an intake valve is arranged below and an exhaust valve is arranged above the intake valve, an intake hole is opened on one side of a cylinder head toward the intake valve, and a carburetor is connected to the intake hole. At the same time, the exhaust hole is opened to the cylinder head upper surface side in a direction in which a line connecting the exhaust valve and the exhaust hole intersects with a horizontal line from above, and the exhaust hole is bent from the cylinder head upper surface side to the side surface. The following effects can be obtained by directly mounting.
（１）排気孔をシリンダヘッド上面側へ開口し、マフラ
ーをシリンダヘッドの左側面へ屈曲させて取付けること
により、点火プラグの配置の自由度が高くなり、メンテ
ナンスの容易化が図られる。(1) The exhaust hole is opened to the upper surface side of the cylinder head, and the muffler is bent and attached to the left side surface of the cylinder head, whereby the degree of freedom of arrangement of the spark plug is increased and the maintenance is facilitated.
（２）冷却風は、高温部となる排気孔，マフラーに直接
当たり、かつ排気弁周辺まで効率良く流れ込むこととな
り、バルブガイドの過熱を防止できるので、バルブガイ
ドの脱落というトラブルは発生しない。(2) The cooling air directly hits the exhaust holes and the muffler, which are high temperature parts, and efficiently flows into the vicinity of the exhaust valve, and the overheating of the valve guide can be prevented, so that the trouble of dropping the valve guide does not occur.
（３）シリンダヘッドの排気孔部の長さが従来に比べて
短く、マフラーとはガスケットにより断熱するため、シ
リンダヘッドの排気側の蓄熱量が少なくてすみ、冷却効
果が向上する。(3) Since the length of the exhaust hole of the cylinder head is shorter than that of the conventional one and the muffler is insulated by a gasket, the amount of heat accumulated on the exhaust side of the cylinder head is small, and the cooling effect is improved.
第１図は本考案の実施例に係る縦型頭上弁式内燃機関の
一部横断平面図、第２図はシリンダヘッド部の縦断正面
図、第３図はシリンダヘッド部の吸気孔と排気孔の縦断
正面図、第４図は従来の縦型頭上弁式内燃機関の一部縦
断側面図、第５図は第４図に於けるＶ視一部横断平面
図、第６図は第４図に於けるVI視相当の縦断正面図であ
る。 51b……シリンダヘッド、52……吸気弁、53……排気
弁、54……プッシュロッド、61……排気孔、62……気化
器、65……マフラー。FIG. 1 is a partially transverse plan view of a vertical overhead valve internal combustion engine according to an embodiment of the present invention, FIG. 2 is a vertical sectional front view of a cylinder head portion, and FIG. 3 is an intake hole and an exhaust hole of the cylinder head portion. FIG. 4 is a partial vertical sectional side view of a conventional vertical overhead valve internal combustion engine, FIG. 5 is a partial cross-sectional plan view of V in FIG. 4, and FIG. 6 is FIG. 6 is a vertical sectional front view corresponding to VI in FIG. 51b Cylinder head, 52 ... Intake valve, 53 ... Exhaust valve, 54 ... Push rod, 61 ... Exhaust hole, 62 ... Vaporizer, 65 ... Muffler.
Claims (1)
けた縦型頭上弁式内燃機関であって、かつシリンダの一
側方に気化器を設け、同気化器に対向してマフラーを配
置した内燃機関に於いて、吸気弁を下方に排気弁を吸気
弁よりも上方にそれぞれ配置しシリンダヘッドの一側面
に前記吸気弁に向って吸気孔を開口し、同吸気孔に気化
器を接続すると共に、前記排気弁と排気孔とを結ぶ線が
水平線に対し上方から交わるように同排気孔をシリンダ
ヘッド上面側に開口し、同排気孔にシリンダヘッド上面
側から側面にかけて屈曲された形状のマフラーを直接取
付けたことを特徴とする縦型頭上弁式内燃機関。1. A vertical overhead valve internal combustion engine in which a crankshaft is oriented vertically and a cylinder is oriented horizontally, and a carburetor is provided on one side of the cylinder, and a muffler is arranged facing the carburetor. In this internal combustion engine, an intake valve is arranged below and an exhaust valve is arranged above the intake valve, and an intake hole is opened on one side of the cylinder head toward the intake valve, and a carburetor is connected to the intake hole. In addition, the exhaust hole is opened to the cylinder head upper surface side so that the line connecting the exhaust valve and the exhaust hole intersects the horizontal line from above, and the exhaust hole has a shape bent from the cylinder head upper surface side to the side surface. A vertical overhead valve internal combustion engine characterized by the direct attachment of a muffler.
Priority Applications (15)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990030493U JP2503134Y2 (en) | 1990-03-27 | 1990-03-27 | Vertical overhead valve type internal combustion engine |
| CA002030583A CA2030583C (en) | 1990-02-22 | 1990-11-23 | Vertical internal combustion engine with overhead valves |
| US07/621,019 US5159909A (en) | 1990-02-22 | 1990-11-30 | Vertical internal combustion engine with overhead valves |
| AU67662/90A AU635093B2 (en) | 1990-02-22 | 1990-11-30 | A vertical internal combustion engine with overhead valves |
| AT93200300T ATE128206T1 (en) | 1990-02-22 | 1990-12-28 | VERTICAL COMBUSTION ENGINE WITH VALVES IN THE CYLINDER HEAD. |
| DE69022603T DE69022603T2 (en) | 1990-02-22 | 1990-12-28 | Vertical internal combustion engine with valves in the cylinder head. |
| DE69023671T DE69023671T2 (en) | 1990-02-22 | 1990-12-28 | Vertical internal combustion engine with valves in the cylinder head. |
| AT90314384T ATE101687T1 (en) | 1990-02-22 | 1990-12-28 | VERTICAL ENGINE WITH OVERHEAD VALVES. |
| EP90314384A EP0443273B1 (en) | 1990-02-22 | 1990-12-28 | A vertical internal combustion engine having overhead valves |
| EP93200302A EP0549572B1 (en) | 1990-02-22 | 1990-12-28 | A vertical internal combustion engine having overhead valves |
| AT93200302T ATE130400T1 (en) | 1990-02-22 | 1990-12-28 | VERTICAL COMBUSTION ENGINE WITH VALVES IN THE CYLINDER HEAD. |
| EP93200300A EP0549571B1 (en) | 1990-02-22 | 1990-12-28 | A vertical internal combustion engine having overhead valves |
| DE69006715T DE69006715T2 (en) | 1990-02-22 | 1990-12-28 | Vertical internal combustion engine with hanging valves. |
| US07/891,644 US5243936A (en) | 1990-02-22 | 1992-05-29 | Vertical internal combustion engine with overhead valves |
| AU26309/92A AU648202B2 (en) | 1990-02-22 | 1992-10-09 | A vertical internal combustion engine with overhead valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990030493U JP2503134Y2 (en) | 1990-03-27 | 1990-03-27 | Vertical overhead valve type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03122241U JPH03122241U (en) | 1991-12-13 |
| JP2503134Y2 true JP2503134Y2 (en) | 1996-06-26 |
Family
ID=31533204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990030493U Expired - Fee Related JP2503134Y2 (en) | 1990-02-22 | 1990-03-27 | Vertical overhead valve type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2503134Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0799093B2 (en) * | 1986-10-01 | 1995-10-25 | ヤマハ発動機株式会社 | Vertical engine for lawn mower |
| JP2621040B2 (en) * | 1987-09-07 | 1997-06-18 | スズキ株式会社 | Vertical general purpose internal combustion engine |
-
1990
- 1990-03-27 JP JP1990030493U patent/JP2503134Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03122241U (en) | 1991-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |