JPH0125666B2 - - Google Patents
Info
- Publication number
- JPH0125666B2 JPH0125666B2 JP57113742A JP11374282A JPH0125666B2 JP H0125666 B2 JPH0125666 B2 JP H0125666B2 JP 57113742 A JP57113742 A JP 57113742A JP 11374282 A JP11374282 A JP 11374282A JP H0125666 B2 JPH0125666 B2 JP H0125666B2
- Authority
- JP
- Japan
- Prior art keywords
- groove
- hole
- grinding
- width
- ground
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 238000009415 formwork Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 7
- 239000006061 abrasive grain Substances 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
【発明の詳細な説明】
本発明は改良された溝研削砥石及びその製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved groove grinding wheel and method of manufacturing the same.
従来、溝研削で溝形状と同じ形状にロータリド
レツサによつて成形された砥石で溝を研削する場
合研削液が研削面に浸透し難い形状の溝或いは砥
石のドレツシングの繰返しなどで研削面が平滑に
なりすぎている砥石の研削は研削液による冷却が
悪いため切削熱若しくは摩擦熱によつて砥石の研
削時間の比較的に長い入口部がひどく次第に奥の
方に達する研削焼け或いは研削割れが発生して成
品が不良となることがしばしばあつた。このため
第１図のようにセグメント砥石若しくはブロツク
砥石の複数個を円周上に間隔をおいて配列固定す
るか、第２図のように砥石の外周から半径方向に
複数個の切込み溝を形成するか、或いは砥石側面
に機械加工で溝を形成した砥石によつて対処して
いた。 Conventionally, when grinding a groove with a grindstone formed into the same shape as the groove by a rotary dresser, the groove is shaped so that the grinding fluid does not easily penetrate into the grinding surface, or the grinding surface is damaged due to repeated dressing of the grindstone. When grinding a whetstone that is too smooth, cooling by the grinding fluid is poor, and the inlet part of the whetstone, where the grinding time is relatively long, is severely affected by cutting heat or frictional heat, resulting in grinding burn or grinding cracks that gradually reach the depths. This often resulted in defective products. For this purpose, a plurality of segment grinding wheels or block grinding wheels are arranged and fixed at intervals on the circumference as shown in Fig. 1, or a plurality of cutting grooves are formed radially from the outer periphery of the grinding wheel as shown in Fig. 2. Alternatively, the problem was dealt with by using a grindstone with grooves machined into the side surface of the grindstone.
発明が解決しようとする問題点
上述の第１のセグメント砥石、ブロツク砥石を
配列するものは、取付治具が必要であり、高周速
に対して飛び出さないよう組立時に慎重な作業が
要求され、また砥石巾、砥石材質の強度的な制約
があり製造コストが高くなる。また第２の半径方
向に切込み溝を形成したものは、砥石巾、砥石材
質の強度的な制約から使用範囲に限界があり、ま
た砥石が切込み溝によつて分断されているため破
断し易く砥粒、ボンドの均一な配合が特に要求さ
れ成形、焼成時に歪が起こらないよう充分な管理
が要求され製造コストが高くなる。さらに第３の
側面の溝を機械加工で形成するものは、巾の狭い
溝用砥石では形成時の加工力に耐えられず製造限
界の範囲が大きくなるとともに溝形成は慎重を要
し製造時間が長くなりコスト高となる等の種々の
問題点があつた。Problems to be Solved by the Invention The above-mentioned first segment grindstone, which arranges the block grindstones, requires a mounting jig, and requires careful work during assembly to avoid popping out at high circumferential speeds. In addition, there are constraints on the strength of the whetstone width and the material of the whetstone, which increases manufacturing costs. In addition, those with cut grooves formed in the second radial direction have a limited range of use due to constraints on the width of the whetstone and the strength of the whetstone material, and because the whetstone is divided by the cut grooves, they tend to break easily. A uniform blend of grains and bonds is particularly required, and sufficient control is required to prevent distortion during molding and firing, which increases manufacturing costs. Furthermore, when the grooves on the third side surface are formed by machining, a grindstone for narrow grooves cannot withstand the machining force during formation, increasing the range of manufacturing limits, and requiring careful groove formation, which takes time. There were various problems such as length and high cost.
本発明は従来の技術の有するこのような問題点
に鑑みなされたもので、その目的とするところ
は、製造過程において***を形成しておいて、成
形、焼成後に溝加工を行うことなく溝研削巾で且
溝深さを研削できる長さにドレツシングすること
によつて同時に溝が形成されるようにして、巾の
狭い溝の研削にも充分研削液が供給でき、研削焼
け、割れの起こらない最適な形で強度のある砥石
を安価に製作できる溝研削用砥石の製造方法を提
供しようとするものである。その第１の発明は円
周に研削溝巾が２列に複数個の穴を穿設した外径
型枠と内径型枠との間に砥粒とボンドとの混合物
を所定量充填して第１回のプレスで下列の穴迄圧
縮し下列の穴に溝深さより長い棒を中心に向つて
挿入し更に上記混合物を所定量充填して第２回の
プレスで上列の穴迄圧縮し上列の穴に同様に棒を
挿入し更に上記混合物を所定量充填して第３回の
プレスを行ない所定の砥石厚みとなしたあと必要
により棒をぬき所定温度で焼成したあと、研削す
べき溝巾で溝深さより長い凸形に成形することを
特徴とする砥石の製造方法である。その第２の発
明は第１の発明の第２列の穴をなくしこれと関連
する第２回のプレスをなくした製造方法である。 The present invention was made in view of the above-mentioned problems of the conventional technology, and its purpose is to form small holes in the manufacturing process and then grind the grooves without having to process the grooves after molding and firing. By dressing to a length that allows for grinding both width and groove depth, grooves are formed at the same time, and sufficient grinding fluid can be supplied even when grinding narrow grooves, preventing grinding burn and cracking. The purpose of the present invention is to provide a method for manufacturing a groove grinding wheel that can produce a strong grindstone in an optimal shape at a low cost. The first invention is to fill a predetermined amount of a mixture of abrasive grains and bond between an outer diameter formwork and an inner diameter formwork in which a plurality of holes with two rows of grinding groove widths are bored on the circumference. In one press, the holes in the bottom row are compressed, a rod longer than the groove depth is inserted into the holes in the bottom row toward the center, and the above mixture is filled in a predetermined amount, and in the second press, the holes in the upper row are compressed. Insert rods into the row holes in the same way, fill the above mixture with a predetermined amount, press a third time to obtain the predetermined thickness of the grinding wheel, remove the rods if necessary, and after baking at a predetermined temperature, form the grooves to be ground. This is a method for manufacturing a grindstone characterized by forming the grindstone into a convex shape whose width is longer than the depth of the groove. The second invention is a manufacturing method that eliminates the second row of holes in the first invention and the associated second press.
以下本発明の実施例を図面にもとづき説明す
る。中心に砥石フランジに嵌装する穴２を有する
ブシユを嵌着した又はブシユなしの砥石１は外周
の巾中央部１ａに研削すべき溝巾とほゞ等しい間
隔を置いて２列に外周よりほゞ中心に向つて研削
すべき溝深さより数倍の深さの穴３，４がほゞ等
間隔で千鳥又は適当間隔になるよう複数個穿設さ
れている。この穴３，４の直径は溝巾と研削面に
円弧溝としてどれだけ残るかによつて決定される
が普通数耗である。また穴はほゞ中心に向けられ
ているが砥石回転方向を考慮して一様に傾斜させ
ることも自由である。また穴は角でも楕円状でも
形状に制限はない。この砥石は研削盤に取付けら
れ溝形状に成形するロータリドレツサによつて研
削すべき溝巾と等しく溝深さより長い凸形となる
ように成形され、穴３，４はそれぞれその中心附
近迄ドレツシングされて砥石の研削両面に放射方
向の溝として露出している。 Embodiments of the present invention will be described below based on the drawings. A grindstone 1 with or without a bush fitted with a bushing having a hole 2 in the center for fitting into a grindstone flange has two rows from the outer periphery at a distance approximately equal to the width of the groove to be ground at the center part 1a of the outer periphery. A plurality of holes 3 and 4 having a depth several times the depth of the groove to be ground are drilled toward the center at approximately equal intervals in a staggered manner or at appropriate intervals. The diameters of the holes 3 and 4 are determined by the groove width and how much arcuate grooves remain on the ground surface, but they are usually worn out. Further, although the holes are oriented almost toward the center, they can be made to have a uniform inclination in consideration of the direction of rotation of the grindstone. Further, the shape of the hole is not limited to either square or elliptical. This grindstone is attached to a grinding machine and formed into a convex shape that is equal to the width of the groove to be ground and longer than the depth of the groove by a rotary dresser that forms a groove shape, and the holes 3 and 4 are dressed up to the vicinity of their centers. The grinding wheels are exposed as radial grooves on both sides.
この砥石の使用においては溝の下加工された若
しくは下加工されていない工作物の溝位置に位置
決めしてプランジカツトで研削する。研削液は砥
石１と工作物の隙間で中央部１ａの凸部の両側面
に向けて供給され遠心力で円弧溝となつた穴３，
４をつたつて端面に流され充分な冷却作用を行な
い研削部の発熱を防止する。また広巾の溝を研削
する場合は片側づつ研削し、片側のみ研削する溝
用の砥石としては研削液を流す穴は研削面側にの
み設けられる。 When using this grindstone, it is positioned at the groove position of a workpiece whose groove has been pre-processed or has not been pre-processed, and is ground by a plunge cut. Grinding fluid is supplied to both sides of the convex part of the central part 1a in the gap between the grinding wheel 1 and the workpiece, and the hole 3 becomes an arcuate groove due to centrifugal force.
4 to the end face to perform a sufficient cooling effect and prevent heat generation in the grinding part. Furthermore, when grinding a wide groove, one side is ground at a time, and for a groove grindstone that grinds only one side, holes through which the grinding fluid flows are provided only on the grinding surface side.
次に上記の砥石の製造方法を第４図第５図にも
とづき説明する。先づ溝の両側を研削する砥石で
は製作する砥石の外径と等しい内径と砥石の厚み
にプレス成形する砥材の充填できる巾を有する外
径型枠２１と砥石フランジに嵌装する内径寸法
（ブシユなしの場合）を外径とする内径型枠２２
とを平板２３に同心に固定する。この外径型枠２
１の外周には平板２３より第４図の砥石１の端面
から溝研削面迄の巾h1と等しい高さに円周上ほゞ
等間隔に複数個の数耗程度の***２４が中心に向
つて穿設され、更に砥石の溝砥削面の他側迄の巾
h2に等しい高さh2の位置で***２４の中間位置に
複数個の数耗程度の***２５が中心に向つて穿設
されている。この***２４，２５の中心間隔h2は
通常研削すべき溝巾とするが砥石が成形せられた
ときに各穴２４，２５の一部分が露出する間隔で
あれば目的が達成される。固定された内外径型枠
の間に工作物の材質に適合する砥材、粒度でなる
砥粒の所定量と適合する結合度に焼成できる種類
のボンドとの所定量の混合物を第１回のプレスで
の圧縮量を考慮して充填する。プレスによつて混
合物を***２４のほゞ中心の高さh1迄圧縮する。
次に***２４より中心に向つて研削すべき溝深さ
より長く穴との間に余裕のある太さの金串２６又
は竹ひごを挿入する。この上に再び前記の混合物
を第２回のプレスで厚みh2迄圧縮するときの圧縮
量を考慮して充填する。プレスによつて混合物を
***２５のほゞ中心の高さh2迄圧縮する。そして
***２５より中心に向つて同じ寸法の金串２６又
は竹ひごを挿入しこの上に再三前記の混合物を第
３回のプレスで最終砥石巾迄圧縮したときの圧縮
量を考慮して充填し、プレスし全体が所要の巾寸
法となるように成形する。このあと金串であれば
抜き取り竹ひごであれば抜き取るか又は外径型枠
２１内面で切断して焼成時に消滅させる。型枠か
ら取り出した成形品は乾燥後炉内に納め所定温度
で焼成する。そしてこの砥石は研削盤の砥石軸に
取付けられ、溝形状に成形するロータリドレツシ
ングによつて研削すべき溝巾と等しく溝深さより
長い凸形となるように成形するものである。 Next, a method for manufacturing the above-mentioned grindstone will be explained based on FIGS. 4 and 5. For a grindstone that grinds both sides of the first groove, the outer diameter form 21 has an inner diameter equal to the outer diameter of the grindstone to be manufactured and a width that can be filled with abrasive material to be press-formed to the thickness of the grindstone, and an inner diameter dimension ( Inner diameter formwork 22 whose outer diameter is
are fixed concentrically to the flat plate 23. This outer diameter formwork 2
On the outer periphery of the grinding wheel 1, a plurality of small holes 24, which are slightly worn, are formed at approximately equal intervals on the circumference at a height equal to the width h1 from the end surface of the grinding wheel 1 to the groove grinding surface shown in FIG. 4 from the flat plate 23. The width of the groove to the other side of the grinding wheel
A plurality of small holes 25, which are approximately worn out, are drilled toward the center at a position in the middle of the small holes 24 at a height h 2 equal to h 2 . The distance h2 between the centers of the small holes 24, 25 is normally the width of the groove to be ground, but the purpose can be achieved if the distance is such that a portion of each hole 24, 25 is exposed when the grindstone is formed. In the first step, a mixture of a predetermined amount of abrasive material and abrasive grains that match the material of the workpiece and a bond of a type that can be fired to a bonding degree that matches the material of the workpiece is placed between the fixed inner and outer diameter forms. Fill with consideration to the amount of compression in the press. The mixture is compressed by a press to a height h 1 approximately at the center of the small hole 24 .
Next, a metal skewer 26 or a bamboo strip is inserted from the small hole 24 toward the center and is longer than the depth of the groove to be ground and has a sufficient thickness between the hole and the hole. On top of this, the mixture is filled again, taking into account the amount of compression when compressing to a thickness h 2 in the second press. The mixture is compressed by a press to a height h 2 approximately at the center of the small hole 25 . Then, a metal skewer 26 or a bamboo strip of the same size is inserted from the small hole 25 towards the center, and the mixture is filled thereon again, taking into consideration the amount of compression when compressed to the final grinding wheel width in the third press. , press and shape the entire piece to the required width. After that, if it is a metal skewer, it is extracted, or if it is a bamboo strip, it is extracted or cut on the inner surface of the outer diameter form 21 to disappear during firing. After drying, the molded product taken out of the mold is placed in a furnace and fired at a predetermined temperature. This grindstone is attached to the grindstone shaft of a grinding machine, and is formed into a convex shape that is equal to the width of the groove to be ground and longer than the depth of the groove by rotary dressing to form a groove.
次に溝の片側のみ研削する砥石は、前述の砥石
製造方法において***２５を穿設せず第２回目の
プレスが必要なくなるものである。 Next, the grindstone that grinds only one side of the groove does not require the small hole 25 in the above-described grindstone manufacturing method, and the second press is not required.
以上詳述したように本発明は、研削液を導く穴
を外径型枠の外周に溝巾間隔又は溝の片面位置に
穴をあけ砥石のプレス成形途中に穴に棒を挿入し
て砥石に***を形成させたので成形焼成後の穴加
工を必要とせず簡単な行程によつて溝研削用の砥
石が安価に製作できる。このように制作した砥石
は溝を研削する両研削面又は片側研削面にほゞ中
心に向つて各穴の一部分を削除した形の溝が形成
されているので、外周をドレツシングする砥石修
正を継続しても次々に砥石表面に溝が現われ研削
部位へ研削液が浸透し易く充分な冷却作用が行な
われ研削焼け或いは研削割れを防止することがで
きる特徴を有する。 As described in detail above, the present invention allows holes for guiding the grinding fluid to be formed on the outer periphery of the outer diameter formwork at groove width intervals or at positions on one side of the groove, and a rod is inserted into the hole during press forming of the grindstone. Since small holes are formed, a grindstone for groove grinding can be manufactured at low cost through a simple process without requiring hole processing after forming and firing. The grindstone produced in this way has a groove formed by removing a portion of each hole toward the center on both grinding surfaces or one side grinding surface, so it is necessary to continue modifying the grindstone by dressing the outer periphery. However, grooves appear one after another on the surface of the grinding wheel, allowing the grinding liquid to easily penetrate into the grinding area, providing a sufficient cooling effect and preventing grinding burn or grinding cracks.
第１図、第２図は従来の砥石の斜視図、第３図
は本発明の製造方法で制作した砥石の斜視図、第
４図はドレツシング時の部分断面図、第５図は製
造過程の途中を示す半裁断面図イは第１プレスロ
は第２プレスハは第３プレス後の状態を示す図、
第６図は溝の片側研削時の研削部位を示す部分の
断面図である。
Figures 1 and 2 are perspective views of a conventional grindstone, Figure 3 is a perspective view of a grindstone manufactured using the manufacturing method of the present invention, Figure 4 is a partial sectional view during dressing, and Figure 5 is a diagram of the manufacturing process. A half-cut cross-sectional view showing the middle is the first press, the second press is a diagram showing the state after the third press,
FIG. 6 is a cross-sectional view of a portion showing the part to be ground when grinding one side of the groove.
Claims (1)
置とこの位置から溝巾寸法離れた第２位置に外周
から中心側に向けて複数個の穴を円周上２列に穿
設した砥石外径を決める型枠と内径を決める型枠
との間に圧縮量を見込んで前記第１位置の穴位置
より高く砥粒とボンドの混合物を充填し、加圧し
て前記第１位置の穴が露出する位置迄押し固め、
その後第１位置の穴より研削すべき溝深さより長
い棒を中心方向に挿入し、圧縮量を見込んで第２
位置の穴より高く前記と同じ混合物を充填し、加
圧して前記第２位置の穴が露出する位置迄押し固
め、その後第２位置の穴より研削すべき溝深さよ
り長い棒を中心方向に挿入し、圧縮量を見込んで
前記と同じ混合物を充填して、加圧して焼成前の
所定巾の砥石に成形し、必要により前記棒を抜
き、所定温度で焼成したあと、研削すべき溝巾で
溝深さより長い凸形に成形することを特徴とする
溝研削用砥石の製造方法。 ２ 端面より修正時に取除く片巾の寸法の位置に
外周から中心側に向けて複数個の穴を円周上１列
に穿設した砥石外径を決める型枠と内径を決める
型枠との間に、圧縮量を見込んで前記穴位置より
高く砥粒とボンドの混合物を充填し、加圧して前
記穴が露出する位置迄押し固め、その後該穴より
研削すべき溝深さより長い棒を中心方向に挿入
し、圧縮量を見込んで前記と同じ混合物を充填
し、加圧して焼成前の所定巾の砥石に成形し、必
要により前記棒を抜き所定温度で焼成したあと、
研削すべき溝巾で溝深さより長い凸形に成形する
ことを特徴とする溝研削用砥石の製造方法。[Claims] 1. A plurality of holes are formed on the circumference from the outer periphery toward the center at a first position corresponding to the width of one side to be removed at the time of correction from the end face and at a second position separated by the groove width from this position. A mixture of abrasive grains and bond is filled between the formwork that determines the outer diameter of the grinding wheels and the formwork that determines the inner diameter of the grindstones drilled in the rows, taking into account the amount of compression that is higher than the hole position at the first position, and pressurizes the abrasive grains and bond. Press down until the hole in the first position is exposed,
After that, insert a rod longer than the depth of the groove to be ground into the hole at the first position toward the center, and take the hole at the second position in anticipation of the amount of compression.
Fill the same mixture as above higher than the hole at the second position, pressurize it and compact it until the hole at the second position is exposed, then insert a rod longer than the depth of the groove to be ground from the hole at the second position towards the center. Then, taking into account the amount of compression, fill the same mixture as above, pressurize it, and form it into a grindstone of a predetermined width before firing.If necessary, remove the rod, and after firing at a predetermined temperature, grind with the groove width to be ground. A method for producing a grinding wheel for groove grinding characterized by forming it into a convex shape that is longer than the groove depth. 2 A formwork for determining the outer diameter of a grinding wheel and a formwork for determining the inner diameter are formed by drilling multiple holes in one row on the circumference from the outer circumference toward the center at the position of the width to be removed during correction from the end face. In between, fill a mixture of abrasive grains and bond higher than the hole position in anticipation of the amount of compression, pressurize and compact until the hole is exposed, and then center a rod longer than the depth of the groove to be ground from the hole. The rod is inserted in the same direction, filled with the same mixture as above in anticipation of the compression amount, pressurized and formed into a grindstone of a predetermined width before firing, and if necessary, the rod is removed and fired at a predetermined temperature.
A method for producing a grinding wheel for groove grinding, characterized in that it is formed into a convex shape with a groove width to be ground that is longer than the groove depth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11374282A JPS597564A (en) | 1982-06-30 | 1982-06-30 | Grinding wheel for grinding groove and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11374282A JPS597564A (en) | 1982-06-30 | 1982-06-30 | Grinding wheel for grinding groove and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS597564A JPS597564A (en) | 1984-01-14 |
| JPH0125666B2 true JPH0125666B2 (en) | 1989-05-18 |
Family
ID=14619971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11374282A Granted JPS597564A (en) | 1982-06-30 | 1982-06-30 | Grinding wheel for grinding groove and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS597564A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114161317A (en) * | 2021-12-17 | 2022-03-11 | 无锡微研股份有限公司 | Method for finely machining narrow groove end face of long-shaft part |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543688B2 (en) * | 1974-12-25 | 1979-02-26 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543688U (en) * | 1977-06-11 | 1979-01-11 | ||
| JPS54133491U (en) * | 1978-03-09 | 1979-09-17 |
-
1982
- 1982-06-30 JP JP11374282A patent/JPS597564A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543688B2 (en) * | 1974-12-25 | 1979-02-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS597564A (en) | 1984-01-14 |
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