JPH0414419Y2 - - Google Patents
Info
- Publication number
- JPH0414419Y2 JPH0414419Y2 JP1986109734U JP10973486U JPH0414419Y2 JP H0414419 Y2 JPH0414419 Y2 JP H0414419Y2 JP 1986109734 U JP1986109734 U JP 1986109734U JP 10973486 U JP10973486 U JP 10973486U JP H0414419 Y2 JPH0414419 Y2 JP H0414419Y2
- Authority
- JP
- Japan
- Prior art keywords
- shield
- fog
- polymer
- film
- water
- 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
- 229920003176 water-insoluble polymer Polymers 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229920001477 hydrophilic polymer Polymers 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229940081735 acetylcellulose Drugs 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Helmets And Other Head Coverings (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Description
［産業上の利用分野］
本考案は、オートバイ、バイク等の二輪車又は
レース用四輪車の乗用時に着用されるヘルメツト
用防曇シールドに関するものである。
［従来の技術］
近年、オートバイの発達は目覚ましく若者を中
心として交通手段の一大勢力となつてきており、
また一般の婦人にもバイクの利用が普及しつつあ
る。これらの二輪車の走行に当つては、道路交通
法上、ヘルメツトの着用が義務づけられている
が、冬期及び梅雨期にはヘルメツトに装着された
シールドはその内面が疎水性であるため、外面と
温度差を生じたときに呼気により内面に「曇り」
を生じ易い致命的な欠点がある。この欠点を解決
するために従来の防曇策は、第一にヘルメツト用
シールドの顔面部分に小さな孔を開け、走行中、
孔から風を導入することによつて「曇り防止」を
図つている。また第二にシールド内面に界面活性
剤等の水溶液を塗布し「曇り防止」を行つてい
る。
しかし、上述の第一の方法は、走行中は防曇効
果はあるものの、ヘルメツト自体の風防の役目を
減殺する上、停車中には風の流れがないため曇り
が発生し、更に厳しい冬期には冷たい風がシール
ド内に流入するため着用者に不快感を与える。ま
た第二の方法は一時的な防曇効果しかなく着用の
都度、塗布しなければない等の問題点があつた。
これらの問題点を解消するシールドとして、ヘ
ルメツトのシールド内面に吸着剤を数種の合成樹
脂で組合せた防曇膜を有するポリエステルフイル
ムを貼合せたものが提案されている（実開昭58−
124427）。
［考案が解決しようとする課題］
しかし、この種のポリエステルフイルムは二軸
延伸で製造されるため、三次元の立体曲面を有す
るシールド内面全体に上記フイルムを貼合せよう
としても上記フイルムは三次元に変形せず、シー
ルド内面全体にフイルムを貼合せることができな
い。
このため上記シールドではフイルムを貼合せた
内面とフイルムを貼合せない内面との間にフイル
ムの厚さ分の段差を生じ、シールドがヘルメツト
の表面に重なつて密着する箇所においてこの段差
により隙間が発生し、この隙間から降雨時には雨
水が侵入する不具合があつた。またこの段差を通
して外界を見た場合には視界の像に歪みを生じる
欠点があつた。更に上記シールドは内面を清浄化
するために繰返し布で払拭していくと、フイルム
端部から剥離する問題点もあつた。
本考案の目的は、上述した従来のヘルメツト用
シールドの防曇上の種々の問題点を解消するもの
で、透過光の均等な屈折により視界の像に歪みが
なく、停車時においても永続性のある防曇効果が
得られるヘルメツト用防曇シールドを提供するこ
とにある。
また本考案の別の目的は、シールド内面全体に
防曇液を塗布して均一な厚さの防曇膜を形成する
ことにより、シールド内面に段差を生じず、雨水
の侵入を防止し、防曇膜の剥離を発生させないヘ
ルメツト用防曇シールドを提供することにある。
［課題を解決するための手段］
上記目的を達成するための本考案の構成を実施
例に対応する第１図及び第２図に基づいて説明す
る。
図において、ヘルメツト用防曇シールド１は、
ポリカ−ボネート、ポリエステル、ポリスチレ
ン、アセチルセルロース、アクリロニトリルスチ
レン、ポリメタクリル酸メチル、アクリロニトリ
ルブタジエンスチレン等の各種の透明プラスチツ
クスで湾曲して成型されたシールドである。
このシールド１の湾曲した内面２全体に親水基
を有する非水溶性ポリマーと界面活性剤とを含む
防曇液を塗布して均一な厚さの防曇膜３が形成さ
れる。
具体的には防曇膜３は液状の上記非水溶性ポリ
マーと、このポリマーのシールド１への濡れ性を
良くし、防曇膜形成後の吸水性を良くするための
界面活性剤とからなる混合液をシールド内面２全
体に均一な厚さにくまなく塗布した後、100℃〜
150℃の温度で10分〜15分間、加熱により直ちに
乾燥して形成される。非水溶性ポリマーとしては
アクリル系、フツ素系、ポリウレタン系の親水性
ポリマー等が用いられる。また、界面活性剤とし
てはアニオン、非イオンのものが用いられる。界
面活性剤は非水溶性ポリマー100重量部に対して
１〜５重量部混合される。
この非水溶性ポリマーには加熱後のシールド１
との接着性をより一層高めるために、微量のエポ
キシ樹脂或いはウレタン樹脂を接着剤として添加
してもよい。上記加熱により、液状のポリマーは
シールド内面２と架橋結合して密着硬化する。同
時にポリマー中の親水基が膜表面に配列される。
［作用］
このような構造のシールド１は、防曇膜３の表
面に非水溶性ポリマー中の親水基が配列するた
め、シールド内面２は親水性となる。また界面活
性剤の存在によりシールド内面２の吸水性を良く
する。この結果、シールド１の内面２が露点温度
以下になつてもシールド１内の空気中の水分は微
小な水滴にならず、曇りは生じない。また極めて
薄く均一な厚さに防曇膜３が形成されるため、肉
眼では防曇膜３の存在は分らず、シールド１を通
しての視界の像が歪むこともない。更に防曇膜３
は非水溶性ポリマーを加熱してシールド１に架橋
結合しているため、触感にベトツキはなく、優れ
た耐久性がある。
［考案の効果］
以上述べたように、従来のシールドはフイルム
端部で段差が生じるのに対して、本考案のシール
ドはシールドの内面全体に均一な厚さの防曇膜が
形成されるため、視界の像が歪むことはなく、良
好な視野が得られる。また非水溶性ポリマーの加
熱架橋により防曇膜が形成されるため、通風に依
らない、永続性のある、しかも繰返し払拭しても
防曇膜が剥離せず耐摩耗性の高い防曇効果が得ら
れる。更に従来のシールドのような段差を生じな
いため、ヘルメツトがシールドの表面に重なつて
密着する箇所から雨水が侵入することがない。
［実施例］
次に本考案の実施例について説明する。
アクリル系親水性ポリマー100重量部に対して
アニオン界面活性剤３重量部を均一に混合した液
を調整する。この混合液を透明なポリカ−ボネー
ト樹脂からなるシールド１のシールド内面２全体
に均一な厚さにくまなく塗布した後、120℃で10
分加熱して防曇膜３を形成した。加熱後の防曇膜
３の厚さは約2μmであつた。
上記加熱処理したシールド１について、次の試
験を行い、時間単位又はサイクル単位で外観、接
着強度及び呼気テストを実施した。その結果を次
表に示す。接着強度は、防曇膜３の上から安全カ
ミソリで１目盛が数mmのます目を５×５の計25目
刻設した後、粘着性の接着テープを防曇膜３の表
面に貼り付け、接着テープを剥いだときに一緒に
剥がれる防曇膜３の目数を調べるテープテストに
より行つた。
耐熱性：100℃の熱風乾燥機内に100時間放置
した。
ヒートサイクル：−20℃で２時間維持しその
後１時間で80℃まで昇温し、80℃で２時間維持
しその後１時間で−20℃まで降温した。−20℃
と80℃の間の６時間の熱履歴を１サイクルとし
た。
耐温水性：75℃の温水に浸漬した。
[Industrial Application Field] The present invention relates to an anti-fog shield for a helmet worn when riding a two-wheeled vehicle such as a motorcycle or a motorbike, or a four-wheeled racing vehicle. [Prior Art] In recent years, motorcycles have developed rapidly and have become a major means of transportation, especially among young people.
The use of motorcycles is also becoming more common among ordinary women. When riding these two-wheeled vehicles, it is compulsory to wear a helmet under the Road Traffic Act, but in winter and the rainy season, the shield attached to the helmet has a hydrophobic inner surface, so the outer surface and temperature When a difference occurs, the inner surface becomes "cloudy" due to exhalation.
There is a fatal drawback that it is easy to cause. To solve this problem, conventional anti-fogging measures firstly make a small hole in the face of the helmet shield.
By introducing wind through the holes, ``fogging prevention'' is attempted. Secondly, an aqueous solution such as a surfactant is applied to the inner surface of the shield to prevent fogging. However, although the first method described above has an anti-fog effect while driving, it reduces the role of the helmet itself as a windshield, and when the helmet is stopped, fogging occurs because there is no wind flow, making it even more difficult to use in harsh winters. causes discomfort to the wearer as cold wind flows into the shield. Further, the second method had problems such as having only a temporary anti-fogging effect and having to reapply it each time it was worn. As a shield to solve these problems, it has been proposed that a polyester film with an anti-fogging film made by combining an adsorbent with several kinds of synthetic resins is laminated to the inner surface of the shield of a helmet (1983-
124427). [Problem to be solved by the invention] However, since this type of polyester film is manufactured by biaxial stretching, even if the film is attached to the entire inner surface of the shield, which has a three-dimensional curved surface, the film will not be 3-dimensional. The shield does not deform, and the film cannot be attached to the entire inner surface of the shield. For this reason, in the above shield, a step equal to the thickness of the film is created between the inner surface to which the film is pasted and the inner surface to which no film is pasted, and this step creates a gap where the shield overlaps and adheres to the surface of the helmet. There was a problem that rainwater could enter through this gap during rain. Furthermore, when viewing the outside world through this step, there was a drawback that the image of the field of view was distorted. Furthermore, when the shield is repeatedly wiped with a cloth to clean the inner surface, there is a problem that the shield peels off from the edge of the film. The purpose of this invention is to solve the various problems with anti-fogging of conventional helmet shields mentioned above.The purpose of this invention is to uniformly refract the transmitted light so that there is no distortion in the visual image, and it is durable even when the helmet is stopped. To provide an anti-fog shield for a helmet that provides a certain anti-fog effect. Another purpose of this invention is to form an anti-fog film with a uniform thickness by applying anti-fog liquid to the entire inner surface of the shield, thereby eliminating steps on the inner surface of the shield and preventing rainwater from entering. To provide an anti-fog shield for a helmet that does not cause peeling of a fog film. [Means for Solving the Problems] The configuration of the present invention for achieving the above object will be explained based on FIGS. 1 and 2, which correspond to embodiments. In the figure, the helmet anti-fog shield 1 is
The shield is curved and molded from various transparent plastics such as polycarbonate, polyester, polystyrene, acetyl cellulose, acrylonitrile styrene, polymethyl methacrylate, and acrylonitrile butadiene styrene. An antifogging liquid containing a water-insoluble polymer having a hydrophilic group and a surfactant is applied to the entire curved inner surface 2 of the shield 1 to form an antifogging film 3 having a uniform thickness. Specifically, the anti-fog film 3 consists of the liquid water-insoluble polymer and a surfactant that improves the wettability of this polymer to the shield 1 and improves water absorption after the anti-fog film is formed. After applying the mixed solution to the entire shield inner surface 2 to a uniform thickness, heat the mixture to 100℃~
Formed by immediate drying by heating at a temperature of 150°C for 10 to 15 minutes. As the water-insoluble polymer, acrylic, fluorine-based, polyurethane-based hydrophilic polymers, etc. are used. Further, as the surfactant, anionic or nonionic surfactants are used. The surfactant is mixed in an amount of 1 to 5 parts by weight per 100 parts by weight of the water-insoluble polymer. This water-insoluble polymer has a shield of 1 after heating.
In order to further improve the adhesion with the material, a small amount of epoxy resin or urethane resin may be added as an adhesive. By the above heating, the liquid polymer crosslinks with the shield inner surface 2 and hardens in close contact with it. At the same time, the hydrophilic groups in the polymer are arranged on the membrane surface. [Function] In the shield 1 having such a structure, the hydrophilic groups in the water-insoluble polymer are arranged on the surface of the antifogging film 3, so that the shield inner surface 2 becomes hydrophilic. Furthermore, the presence of the surfactant improves the water absorption of the shield inner surface 2. As a result, even if the inner surface 2 of the shield 1 falls below the dew point temperature, the moisture in the air within the shield 1 does not turn into minute water droplets, and fogging does not occur. Further, since the anti-fog film 3 is formed to have an extremely thin and uniform thickness, the presence of the anti-fog film 3 is invisible to the naked eye, and the image seen through the shield 1 is not distorted. Furthermore, anti-fog film 3
Since the water-insoluble polymer is heated and cross-linked to the shield 1, it does not feel sticky to the touch and has excellent durability. [Effects of the invention] As mentioned above, while the conventional shield has a step at the edge of the film, the shield of the present invention has an anti-fogging film of uniform thickness formed on the entire inner surface of the shield. , the image in the field of view is not distorted and a good field of view can be obtained. In addition, since the anti-fog film is formed by thermal cross-linking of the water-insoluble polymer, it is durable and does not depend on ventilation, and the anti-fog film does not peel off even after repeated wiping, resulting in a highly abrasion-resistant anti-fog effect. can get. Furthermore, since there is no difference in level as in conventional shields, rainwater does not intrude from the area where the helmet overlaps and is in close contact with the surface of the shield. [Example] Next, an example of the present invention will be described. A liquid is prepared by uniformly mixing 3 parts by weight of an anionic surfactant with 100 parts by weight of an acrylic hydrophilic polymer. After applying this mixed solution to an even thickness over the entire shield inner surface 2 of the shield 1 made of transparent polycarbonate resin,
The antifogging film 3 was formed by heating for 30 minutes. The thickness of the antifogging film 3 after heating was about 2 μm. The heat-treated shield 1 was subjected to the following tests, and the appearance, adhesion strength, and breath test were conducted on an hourly or cycle basis. The results are shown in the table below. To measure the adhesive strength, use a safety razor to carve 5 x 5 squares (25 in total, each scale being several millimeters) on top of the anti-fog film 3, and then apply adhesive tape to the surface of the anti-fog film 3. A tape test was conducted to determine the number of stitches in the antifogging film 3 that were peeled off when the adhesive tape was peeled off. Heat resistance: Left in a hot air dryer at 100℃ for 100 hours. Heat cycle: The temperature was maintained at -20°C for 2 hours, then the temperature was raised to 80°C in 1 hour, the temperature was maintained at 80°C for 2 hours, and then the temperature was lowered to -20°C in 1 hour. -20℃
One cycle consisted of a 6-hour thermal history between 80°C and 80°C. Hot water resistance: Immersed in 75℃ hot water.
【表】
表より、耐熱性、ヒートサイクル及び耐
温水性とも表に示した条件下では優れた防曇効果
を示した。また接着強度を示すテープテストで
は、25目全て残存した。[Table] As shown in the table, excellent antifogging effects were exhibited in terms of heat resistance, heat cycle resistance, and hot water resistance under the conditions shown in the table. In addition, in a tape test showing adhesive strength, all 25 stitches remained.
第１図は本考案実施例のヘルメツト用防曇シー
ルドの断面図。第２図はその外観斜視図。
１……ヘルメツト用防曇シールド、２……シー
ルド内面、３……防曇膜。
FIG. 1 is a sectional view of an anti-fog shield for a helmet according to an embodiment of the present invention. FIG. 2 is a perspective view of its appearance. 1... Anti-fog shield for helmet, 2... Inner surface of shield, 3... Anti-fog film.
Claims (1)
防曇膜が形成されたヘルメツト用防曇シールド
において、 前記防曇膜が前記シールドの湾曲した内面全
体に親水基を有する非水溶性ポリマーと界面活
性剤とを含む防曇液を塗布した後加熱すること
により前記シールド内面全体に前記ポリマーを
架橋結合させて密着硬化しかつ前記ポリマーの
親水基を膜表面に配列させて均一な厚さに形成
されたことを特徴とするヘルメツト用防曇シー
ルド。 ２ 親水基を有する非水溶性ポリマーはアクリル
系親水性ポリマーである実用新案登録請求の範
囲第１項に記載のヘルメツト用防曇シールド。 ３ 親水基を有する非水溶性ポリマーはフツ素系
親水性ポリマーである実用新案登録請求の範囲
第１項に記載のヘルメツト用防曇シールド。 ４ 親水基を有する非水溶性ポリマーはポリウレ
タン系親水性ポリマーである実用新案登録請求
の範囲第１項に記載のヘルメツト用防曇シール
ド。[Claims for Utility Model Registration] 1. An anti-fog shield for a helmet that is curved and molded from transparent plastic and has an anti-fog film formed on the inner surface, wherein the anti-fog film has hydrophilic groups on the entire curved inner surface of the shield. After applying an antifogging liquid containing a water-insoluble polymer and a surfactant, the polymer is cross-linked to the entire inner surface of the shield and hardened in close contact by heating, and the hydrophilic groups of the polymer are arranged on the membrane surface. An anti-fog shield for helmets that is characterized by being formed to a uniform thickness. 2. The anti-fog shield for a helmet according to claim 1, wherein the water-insoluble polymer having a hydrophilic group is an acrylic hydrophilic polymer. 3. The anti-fog shield for a helmet according to claim 1, wherein the water-insoluble polymer having a hydrophilic group is a fluorine-based hydrophilic polymer. 4. The anti-fog shield for a helmet according to claim 1, wherein the water-insoluble polymer having a hydrophilic group is a polyurethane-based hydrophilic polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986109734U JPH0414419Y2 (en) | 1985-12-10 | 1986-07-17 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18917285 | 1985-12-10 | ||
| JP1986109734U JPH0414419Y2 (en) | 1985-12-10 | 1986-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62166221U JPS62166221U (en) | 1987-10-22 |
| JPH0414419Y2 true JPH0414419Y2 (en) | 1992-03-31 |
Family
ID=33455064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986109734U Expired JPH0414419Y2 (en) | 1985-12-10 | 1986-07-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0414419Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124427U (en) * | 1982-02-19 | 1983-08-24 | 若菜 節夫 | Anti-fog windshield using polyester film attached to helmet |
-
1986
- 1986-07-17 JP JP1986109734U patent/JPH0414419Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62166221U (en) | 1987-10-22 |
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