JPH0571764B2 - - Google Patents
Info
- Publication number
- JPH0571764B2 JPH0571764B2 JP59193914A JP19391484A JPH0571764B2 JP H0571764 B2 JPH0571764 B2 JP H0571764B2 JP 59193914 A JP59193914 A JP 59193914A JP 19391484 A JP19391484 A JP 19391484A JP H0571764 B2 JPH0571764 B2 JP H0571764B2
- Authority
- JP
- Japan
- Prior art keywords
- perforated plate
- absorbing material
- sound absorbing
- expansion tube
- exhaust
- 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
Links
- 239000011358 absorbing material Substances 0.000 claims description 37
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000011324 bead Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 206010044625 Trichorrhexis Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、膨張管本体の内壁面に吸音材および
多孔板を設けた２サイクル内燃機関の排気膨張管
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an exhaust expansion pipe for a two-stroke internal combustion engine, in which a sound absorbing material and a perforated plate are provided on the inner wall surface of the expansion pipe main body.
内燃機関の燃焼室と消音器を結ぶ排気膨張管と
して、実公昭52−24674号公報に記載されている
ように、膨張管本体の内壁面にグラスウール等の
吸音材を内張して、排ガスの脈動圧による側壁の
共鳴音を防止するものは知られている。
As described in Japanese Utility Model Publication No. 52-24674, as an exhaust expansion pipe that connects the combustion chamber of an internal combustion engine and a muffler, the inner wall of the expansion pipe body is lined with a sound absorbing material such as glass wool to reduce exhaust gas. Devices that prevent side wall resonance due to pulsating pressure are known.
しかしながら、２サイクル内燃機関の場合、脈
動圧の反射波がエンジンの性能に影響を及ぼすの
で大きな反射面が欲しいと同時に、効果的な消音
が望まれる。 However, in the case of a two-stroke internal combustion engine, reflected waves of pulsating pressure affect engine performance, so a large reflective surface is desired, as well as effective noise reduction.
このようなことから上記公報のものは、吸音材
をパンチングメタルなどのような多孔板により保
持する構造が用いられている。 For this reason, the structure of the above-mentioned publication uses a structure in which the sound absorbing material is held by a perforated plate such as punched metal.
しかしながら、上記公報のものは、多孔板が押
え板により支持されており、また、他の従来の場
合、多孔板は膨張管本体に直接スポツト溶接され
ていた。これら従来のものは、排ガスの脈動圧に
より加振された多孔板の振動が、押え板を介し
て、または直接膨張管本体に伝達され、シエル音
を増大させる不具合があつた。さらに押え板と膨
張管本体、または多孔板と膨張管本体は、スポツ
ト溶接のために直接接触する部分が必要であり、
この接触部分に吸音材を介在することができない
ため、吸音面積が小さくなる欠点があつた。
However, in the above-mentioned publication, the perforated plate is supported by a holding plate, and in other conventional cases, the perforated plate is directly spot-welded to the expansion tube body. These conventional devices have a problem in that the vibrations of the porous plate caused by the pulsating pressure of the exhaust gas are transmitted to the expansion tube body via the holding plate or directly, increasing the shell noise. Furthermore, the holding plate and the expansion tube body, or the perforated plate and the expansion tube body, must have a part that comes into direct contact for spot welding.
Since a sound absorbing material cannot be interposed in this contact portion, there is a drawback that the sound absorbing area becomes small.
本発明は上記の事情に基づきなされたもので、
多孔板の振動が膨張管本体に伝達され難く、かつ
吸音面積が大きく確保できてシエル音を低減する
２サイクル内燃機関の排気膨張管を提供しようと
するものである。
The present invention was made based on the above circumstances,
It is an object of the present invention to provide an exhaust expansion pipe for a two-stroke internal combustion engine, in which vibrations of a perforated plate are hardly transmitted to the expansion pipe main body, and a large sound-absorbing area can be ensured to reduce shell noise.
本発明は上記目的を達成するため、中間部に比
べて前部および後部の径を縮小してほぼ紡錘形を
なす膨張管本体の内側に吸音材を設けるととも
に、この吸音材の内側に多孔板を設けた２サイク
ル内燃機関の排気膨張管において、
上記多孔板を、中間部に比べて前部および後部
の径を縮小したほぼ紡錘形でありかつ上記膨張管
本体の形に似せた筒形に形成し、この多孔板の外
周を上記吸音材に当接させ、この多孔板を全体に
亘り膨張管本体から離間させたことを特徴とす
る。
In order to achieve the above object, the present invention provides a sound-absorbing material inside the expansion tube main body, which has a substantially spindle shape by reducing the diameter of the front and rear parts compared to the middle part, and a perforated plate inside the sound-absorbing material. In the exhaust expansion pipe of the two-stroke internal combustion engine provided, the perforated plate is formed into a substantially spindle shape with diameters reduced at the front and rear parts compared to the middle part, and into a cylindrical shape resembling the shape of the expansion pipe main body. , the outer periphery of the perforated plate is brought into contact with the sound absorbing material, and the entire perforated plate is spaced apart from the expansion tube main body.
本発明によれば、多孔板を吸音材のみで支持す
ることになるから、多孔板の振動が吸音材で吸収
され、膨張管本体に伝わることがなくなり、シエ
ル音を軽減することができる。また、吸音材を膨
張管本体の内面全面に亘り張設することができる
ので、吸音性が向上する。しかも、多孔板は、中
間部に比べて前部および後部の径を縮小したほぼ
紡錘形とし、これにより膨張管本体の形に似せた
筒形に形成してあるから、多孔板が単に吸音材の
みに当接しているにも拘らず多孔板が膨張管本体
の内部で変位することがない。
According to the present invention, since the perforated plate is supported only by the sound absorbing material, the vibration of the perforated plate is absorbed by the sound absorbing material and is not transmitted to the expansion tube body, so that the shell noise can be reduced. Further, since the sound absorbing material can be stretched over the entire inner surface of the expansion tube body, sound absorbing properties are improved. Moreover, the perforated plate is almost spindle-shaped with the diameters of the front and rear parts reduced compared to the middle part, and is thus formed into a cylindrical shape that resembles the shape of the expansion tube body, so the perforated plate is simply a sound-absorbing material. The perforated plate does not displace inside the expansion tube body even though it is in contact with the expansion tube body.
以下本発明について、第１図ないし第１０図に
示す一実施例に基づき説明する。
The present invention will be explained below based on an embodiment shown in FIGS. 1 to 10.
第１図は自動二輪車を示し、１は前輪、２は後
輪、３はハンドル、４は２サイクルエンジン、５
は排気膨張管、６はマフラ、７は燃料タンク、８
はシートである。 Figure 1 shows a motorcycle, where 1 is the front wheel, 2 is the rear wheel, 3 is the handle, 4 is the two-stroke engine, and 5 is the front wheel.
is the exhaust expansion pipe, 6 is the muffler, 7 is the fuel tank, 8
is a sheet.
排気膨張管５は第２図に示すように、略Ｌ字形
をなし、しかも中間部に比べて前部および後部が
小径な紡錘形をなしている。排気膨張管５の前端
は排気管９によりエンジンの燃焼室に接続され、
後端は接続管１０により上記マフラ６に連通され
ている。 As shown in FIG. 2, the exhaust expansion pipe 5 has a substantially L-shape, and is spindle-shaped with the front and rear portions having smaller diameters than the middle portion. The front end of the exhaust expansion pipe 5 is connected to the combustion chamber of the engine by an exhaust pipe 9,
The rear end is connected to the muffler 6 through a connecting pipe 10.
排気膨張管５は、第３図以下に示すように、板
金製の膨張管本体１１と、この膨張管本体１１内
張りされたグラスウール、スチールウールなどよ
りなる吸音材１２と、この吸音材１２の内壁面に
配置されたパンチングメタルよりなる多孔板１３
とで構成されている。 As shown in FIGS. 3 and below, the exhaust expansion tube 5 includes an expansion tube body 11 made of sheet metal, a sound absorbing material 12 made of glass wool, steel wool, etc. lined with the expansion tube body 11, and an inner layer of the sound absorbing material 12. Perforated plate 13 made of punched metal arranged on the wall surface
It is made up of.
膨張管本体１１は、略Ｌ字形をなす排気通路の
軸線に沿つて、第４図に示すように、左右に２つ
割りされており、これら２つ割りされた分割部材
１４ａ，１４ｂは衝合面に設けた溶接代１５ａ，
１５ｂをシーム溶接１６することにより接合され
ている。 The expansion tube main body 11 is divided into two parts on the left and right sides along the axis of the substantially L-shaped exhaust passage, as shown in FIG. Welding allowance 15a provided on the surface,
15b are joined by seam welding 16.
吸音材１２は上記膨張管本体１１の内壁面に全
面に亙り、所定の厚みをもつて付設されており、
したがつて、この吸音材１２も略Ｌ字形をなしか
つ中間部に比べて前部および後部が小径な紡錘形
をなしている。なお、吸音材１２は略Ｌ字形をな
す排気通路の軸線に沿つて、第４図に示すよう
に、上下に２つ割り１７ａ，１７ｂされており、
上記膨張管本体１１と多孔板１３との間で挟持さ
れている。 The sound absorbing material 12 is attached to the entire inner wall surface of the expansion tube main body 11 with a predetermined thickness,
Therefore, this sound absorbing material 12 is also substantially L-shaped and spindle-shaped, with the front and rear portions having smaller diameters than the middle portion. In addition, the sound absorbing material 12 is divided into upper and lower halves 17a and 17b along the axis of the approximately L-shaped exhaust passage, as shown in FIG.
It is held between the expansion tube main body 11 and the perforated plate 13.
多孔板１３は上記膨張管本体１１と相似形をな
した筒形に形成されており、略全面に亙つて上記
吸音材１２の内面に接触しているとともに、筒形
多孔板１３の両端縁はそれぞれ上記膨張管本体１
１から離間させられている。したがつて、多孔板
１３は上記吸音材１２により支持され、該吸音材
１２により受かされることになり膨張管本体１１
に直接接触することなく取付けられている。この
場合、多孔板１３も略Ｌ字形をなしかつ中間部に
比べて前部および後部が小径な紡錘形をなしてい
るので、該多孔板１３が膨張管本体１１の内部で
移動することはない。なお、多孔板１３も上記膨
張管本体１１と同様に、略Ｌ字形をなす排気通路
の軸線に沿つて、第４図に示すように、左右に２
つ割りされており、これら２つ割りされた分割部
材１８ａ，１８ｂは第６図のように、その分割端
部を重ね合せて溶接１９することにより筒状に形
成されている。 The perforated plate 13 is formed into a cylindrical shape similar to the expansion tube main body 11, and is in contact with the inner surface of the sound absorbing material 12 over almost the entire surface, and both edges of the cylindrical perforated plate 13 are The above-mentioned expansion tube main body 1
It is separated from 1. Therefore, the perforated plate 13 is supported by the sound absorbing material 12 and is received by the sound absorbing material 12, so that the expansion tube main body 11
installed without direct contact with the In this case, the perforated plate 13 is also substantially L-shaped and has a spindle shape with the front and rear parts having smaller diameters than the middle part, so the perforated plate 13 does not move inside the expansion tube main body 11. Note that, like the expansion tube body 11, the perforated plate 13 also has two holes on the left and right, as shown in FIG. 4, along the axis of the approximately L-shaped exhaust passage.
These two divided members 18a and 18b are formed into a cylindrical shape by overlapping the divided ends and welding 19, as shown in FIG.
上記実施例においては、膨張管本体１１の両端
部に、第５図に一方を示すように、それぞれ外方
に膨出するビード部２０，２０を形成してあり、
これらビード部２０，２０に対応して多孔板１２
にも両端部にそれぞれ外方に膨出するビード部２
１，２１を形成してあり、これらビード部２０，
２０，２１，２１間に吸音材１２を挟み込んでい
る。これにより、吸音材１２の端部を排気流れか
ら保護するとともに、多孔板１３の移動を一層阻
止している。 In the above embodiment, outwardly bulging bead portions 20, 20 are formed at both ends of the expansion tube main body 11, one of which is shown in FIG.
The perforated plate 12 corresponds to these bead parts 20, 20.
There are also bead portions 2 that bulge outward at both ends.
1 and 21 are formed, and these bead portions 20,
A sound absorbing material 12 is sandwiched between 20, 21, and 21. This protects the ends of the sound absorbing material 12 from the exhaust flow and further prevents the perforated plate 13 from moving.
このような排気膨張管５は第７図ないし第１０
図に示すようにして組立てられている。すなわ
ち、まず、第７図に示す左右の多孔板分割部材１
８ａ，１８ｂを突合わせ、その分割端部を重ね合
せて溶接１９することにより、略Ｌ字形および紡
錘形の多孔板１３を形成する。 Such an exhaust expansion pipe 5 is shown in FIGS. 7 to 10.
It is assembled as shown in the figure. That is, first, the left and right perforated plate dividing members 1 shown in FIG.
By abutting 8a and 18b, overlapping the split ends, and welding 19, a substantially L-shaped and spindle-shaped perforated plate 13 is formed.
つぎに、上記略Ｌ字形および紡錘形の多孔板１
３の外側に、上下方向から、第８図に示す２つ割
りされた吸音材１２、たとえば予め所定の形状に
成形された成形グラスウール１７ａ，１７ｂを被
着する。 Next, the substantially L-shaped and spindle-shaped perforated plate 1
A sound absorbing material 12 divided into two as shown in FIG. 8, for example, molded glass wool 17a and 17b previously molded into a predetermined shape, is applied to the outside of the sound absorbing material 3 from above and below.
この後、上記吸音材１２の外側に、第９図に示
すように、左右方向から膨張管本体の分割部材１
４ａ，１４ｂを被せ、溶接代１５ａ，１５ｂを衝
合する。そして、これら溶接代１５ａ，１５ｂを
互にシーム溶接１６することにより排気膨張管５
が完成される。 Thereafter, as shown in FIG. 9, the dividing member 1 of the expansion tube main body is
4a and 14b and match the welding allowances 15a and 15b. By seam welding 16 these welding allowances 15a and 15b to each other, the exhaust expansion pipe 5
is completed.
このような排気膨張管５によれば、内周面にパ
ンチングメタルなどの多孔板１３を有しているの
で、エンジンからの排気がこの多孔板１３により
反射され、反射波を生じるため２サイクルのエン
ジン性能が良くなる。 According to such an exhaust expansion pipe 5, since it has a perforated plate 13 made of punched metal or the like on the inner circumferential surface, the exhaust gas from the engine is reflected by this perforated plate 13 and generates a reflected wave, so that two cycles are performed. Engine performance improves.
しかも多孔板１３は吸音材１２のみで支持さ
れ、膨張管本体１１に直接触れないので、排気脈
動圧により多孔板１３が振動しても、この振動は
吸音材１２により減衰されて膨張管本体１１に伝
達されない。このため、膨張管本体１１にシエル
音を発生させることがなくなる。 Moreover, the perforated plate 13 is supported only by the sound absorbing material 12 and does not directly touch the expansion tube main body 11. Even if the perforated plate 13 vibrates due to exhaust pulsation pressure, this vibration is attenuated by the sound absorbing material 12 and the expansion tube main body 11 is not transmitted. For this reason, the expansion tube main body 11 does not generate shell noise.
また、このような構造であると、吸音材１２は
膨張管本体１１を内面全体に亙つて張りり付けら
れるので、吸音面積が増大し、吸音作用が増す。 Further, with such a structure, the sound absorbing material 12 is attached to the entire inner surface of the expansion tube body 11, so that the sound absorbing area increases and the sound absorbing effect increases.
本実施例の場合、膨張管本体１の両端部に形成
したビード部２０，２０と、多孔板１２の両端部
に形成したビード部２１，２１の間で吸音材１２
を挟み込んであるから、多孔板１３の移動がこれ
らビード部２０，２１により確実に阻止される。 In the case of this embodiment, the sound absorbing material 12 is formed between the bead portions 20, 20 formed at both ends of the expansion tube body 1 and the bead portions 21, 21 formed at both ends of the perforated plate 12.
Since the bead portions 20 and 21 are sandwiched between the bead portions 20 and 21, movement of the porous plate 13 is reliably prevented.
しかも、吸音材１２の端部はこれら外方に脹ら
むビード部２０，２１に挟持されるので、吸音材
１２の端部は排気流れを避けた位置に配置される
ことになり、吸音材１２の端部が排気の圧力でほ
つれることがなくなる。 Moreover, since the ends of the sound absorbing material 12 are sandwiched between the outwardly swollen bead parts 20 and 21, the ends of the sound absorbing material 12 are placed at a position avoiding the exhaust flow. The edges will not fray due to exhaust pressure.
また、吸音材１２の分割は、膨張管本体１１の
分割方向および多孔板１２の分割方向に対して直
角方向としてあるから、吸音材１２の切断面の毛
ば立ちが上記膨張管本体１１および多孔板１２の
衝合面に噛み込まれることなく、衝合不良や溶接
の不完全を招く不具合はない。 Furthermore, since the sound absorbing material 12 is divided in a direction perpendicular to the dividing direction of the expansion tube body 11 and the dividing direction of the perforated plate 12, the fuzz on the cut surface of the sound absorbing material 12 is It does not get caught in the abutting surfaces of the plates 12, and there is no problem of causing poor abutment or incomplete welding.
なお、本発明は上記実施例の構成に制約される
ものではなく、上記実施例のビード部２０，２１
に代わつて第１１図に示すように、多孔板１３の
端部３０のみを、膨張管本体１１に接触すること
のないように拡径させるようにしてもよい。 Note that the present invention is not limited to the configuration of the above embodiment, and the bead portions 20, 21 of the above embodiment
Alternatively, as shown in FIG. 11, only the end 30 of the perforated plate 13 may be expanded in diameter so as not to come into contact with the expansion tube main body 11.
以上述べたように本発明によると、多孔板を吸
音材のみで、膨張管本体に接触させることなく支
持することになるので、排気脈動圧により加振さ
れる多孔板の振動は膨張管本体に伝達されず、シ
エル音が低減される。しかも吸音材は膨張管本体
の内面全体に亙つて張ることができるから、吸音
効果が上昇する。
As described above, according to the present invention, the perforated plate is supported only by the sound absorbing material without coming into contact with the expansion tube body, so the vibration of the perforated plate excited by exhaust pulsation pressure is transmitted to the expansion tube body. is not transmitted, and the shell sound is reduced. Moreover, since the sound-absorbing material can be spread over the entire inner surface of the expansion tube body, the sound-absorbing effect is improved.
第１図ないし第１０図は本発明に一実施例を示
し、第１図は自動二輪車の側面図、第２図は排気
膨張管の斜視図、第３図は排気膨張管の一部断面
した側面図、第４図は第３図中−線の断面
図、第５図は第３図中Ｖ部の拡大した断面図、第
６図は第４図中部の拡大した断面図、第７図な
いし第１０図は組立て順に示す説明図、第１１図
は本発明の他の実施例を示す上記第５図に相当す
る部分拡大断面図である。
４……２サイクルエンジン、５……排気膨張
管、１１……膨張管本体、１２……吸音材、１３
……多孔板。
Figures 1 to 10 show one embodiment of the present invention, in which Figure 1 is a side view of a motorcycle, Figure 2 is a perspective view of an exhaust expansion pipe, and Figure 3 is a partially cross-sectional view of the exhaust expansion pipe. A side view, FIG. 4 is a sectional view taken along the line - - in FIG. 3, FIG. 5 is an enlarged sectional view of the V section in FIG. 3, FIG. 6 is an enlarged sectional view of the middle part of FIG. 4, and FIG. 10 to 10 are explanatory diagrams showing the order of assembly, and FIG. 11 is a partially enlarged sectional view corresponding to FIG. 5, showing another embodiment of the present invention. 4... Two-cycle engine, 5... Exhaust expansion pipe, 11... Expansion pipe body, 12... Sound absorbing material, 13
...Perforated plate.
Claims (1)
てほぼ紡錘形をなす膨張管本体の内側に吸音材を
設けるとともに、この吸音材の内側に多孔板を設
けた２サイクル内燃機関の排気膨張管において、 上記多孔板を、中間部に比べて前部および後部
の径を縮小したほぼ紡錘形でありかつ上記膨張管
本体の形に似せた筒形に形成し、この多孔板の外
周を上記吸音材に当接させ、この多孔板を全体に
亘り膨張管本体から離間させたことを特徴とする
２サイクル内燃機関の排気膨張管。[Scope of Claims] 1. A sound absorbing material is provided inside the expansion tube body, which has a substantially spindle shape with the diameters of the front and rear portions reduced compared to the middle portion, and a perforated plate is provided inside the sound absorbing material.2. In the exhaust expansion pipe of a cycle internal combustion engine, the perforated plate is formed into a substantially spindle shape with diameters reduced at the front and rear parts compared to the middle part, and into a cylindrical shape resembling the shape of the expansion pipe main body. An exhaust gas expansion pipe for a two-stroke internal combustion engine, characterized in that the outer periphery of the plate is brought into contact with the sound absorbing material, and the entire perforated plate is spaced apart from the expansion pipe main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19391484A JPS6172814A (en) | 1984-09-18 | 1984-09-18 | Exhaust expansion pipe for 2-cycle internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19391484A JPS6172814A (en) | 1984-09-18 | 1984-09-18 | Exhaust expansion pipe for 2-cycle internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6172814A JPS6172814A (en) | 1986-04-14 |
| JPH0571764B2 true JPH0571764B2 (en) | 1993-10-07 |
Family
ID=16315839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19391484A Granted JPS6172814A (en) | 1984-09-18 | 1984-09-18 | Exhaust expansion pipe for 2-cycle internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6172814A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2793808B2 (en) * | 1988-03-17 | 1998-09-03 | ヤマハ発動機株式会社 | Exhaust system for two-cycle engine |
| JP7061020B2 (en) * | 2018-06-05 | 2022-04-27 | カワサキモータース株式会社 | Exhaust system for saddle-mounted vehicles |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534894B2 (en) * | 1972-12-29 | 1978-02-22 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534894U (en) * | 1976-06-30 | 1978-01-17 |
-
1984
- 1984-09-18 JP JP19391484A patent/JPS6172814A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534894B2 (en) * | 1972-12-29 | 1978-02-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6172814A (en) | 1986-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |