JP2548676Y2 - Workpiece support device for centerless grinding machine - Google Patents
Workpiece support device for centerless grinding machineInfo
- Publication number
- JP2548676Y2 JP2548676Y2 JP1991026218U JP2621891U JP2548676Y2 JP 2548676 Y2 JP2548676 Y2 JP 2548676Y2 JP 1991026218 U JP1991026218 U JP 1991026218U JP 2621891 U JP2621891 U JP 2621891U JP 2548676 Y2 JP2548676 Y2 JP 2548676Y2
- Authority
- JP
- Japan
- Prior art keywords
- workpiece
- grinding
- work
- supported
- roller
- 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
- 238000005096 rolling process Methods 0.000 claims description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 description 8
- 239000006061 abrasive grain Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000007779 soft material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- -1 acryl Chemical group 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Landscapes
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Description
【0001】[0001]
【産業上の利用分野】この考案は、センタレス研削盤の
工作物支持装置に関し、さらに詳細には、研削中に生ず
る切屑や脱落砥粒による工作物表面の損傷を防止する支
持構造を備えた工作物支持装置の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supporting apparatus for a centerless grinding machine, and more particularly to a work provided with a support structure for preventing a work surface from being damaged by chips or falling off abrasive grains generated during grinding. The present invention relates to improvement of an object support device.
【0002】[0002]
【従来の技術】センタレス研削盤においては、図3に示
すように、調整車Rおよび受台であるブレード(支持
刃)Bにより工作物Wを支持しながら、この工作物Wの
外周を研削砥石車Gによって研削するところ、研削によ
り生じた切屑(スラッヂ)や脱落砥粒が工作物Wと支持
部との接触部分、つまり、工作物WとブレードBとの接
触点P1部分および工作物Wと調整車R側ワークガイド
Cとの接触点P2部分に侵入して噛込み易い。2. Description of the Related Art In a centerless grinding machine, as shown in FIG. 3, while a work W is supported by an adjusting wheel R and a blade (supporting blade) B as a receiving base, an outer periphery of the work W is ground by a grinding wheel. When grinding the vehicle G, the contact portion between the chips produced by grinding (Suraddji) or omission abrasive grains the workpiece W and the supporting unit, that is, the workpiece W and the contact point P 1 portion of the blade B and the workpiece W easily biting invade the contact point P 2 portion of the regulating wheel R side work guide C and.
【0003】これら噛込んだ切屑等は、工作物Wが硬い
材質の場合は研削精度上それほど問題とならないが、複
写機のコピーローラ(アルミニウム合金製)や自動二輪
車のインナチューブ(表面にクロムメッキが施されてい
る)などのように比較的柔らかい材質の場合には、工作
物Wの外周面を傷付けて研削精度を大幅に低下させてし
まうという問題があった。[0003] When the workpiece W is made of a hard material, the bites and the like do not pose a serious problem in terms of grinding accuracy. However, a copy roller of a copying machine (made of aluminum alloy) or an inner tube of a motorcycle (chrome plating on the surface) is used. However, in the case of a relatively soft material such as that described above, there is a problem that the outer peripheral surface of the workpiece W is damaged and the grinding accuracy is greatly reduced.
【0004】[0004]
【考案が解決しようとする課題】この点を改良したもの
として、例えば実公昭51−22393号公報に開示さ
れる技術がある。As an improvement over this point, there is a technique disclosed in Japanese Utility Model Publication No. 51-22393, for example.
【0005】これは、図4に示すように、上記ブレード
B内に研削液の供給孔aが設けられるとともに、ブレー
ドBの支持面(頂面)bに研削液噴射用の開口c,cが
設けられてなり、これら開口c,cから噴射する研削液
により、上記工作物Wの外周面と上記支持面bとの間に
進入しようとする切屑等を吹き払うように構成されてお
り、これにより、これら切屑等の除去にはある程度の効
果があがっていた。[0005] As shown in FIG. 4, as shown in FIG. 4, a grinding liquid supply hole a is provided in the above-mentioned blade B, and openings c, c for grinding liquid injection are formed in a support surface (top surface) b of the blade B. The grinding fluid sprayed from the openings c, c is configured to blow off chips and the like that are going to enter between the outer peripheral surface of the workpiece W and the support surface b. Thus, the removal of these chips and the like had a certain effect.
【0006】しかしながら、このような構造でもまだ完
全な切屑等の除去は不可能であり、そればかりか、以下
のような不具合が新たに生じており、さらなる改良が要
望されていた。[0006] However, even with such a structure, it is still impossible to completely remove chips and the like, and in addition, the following inconvenience has newly occurred, and further improvement has been demanded.
【0007】すなわち、上記ブレードBの支持面b部分
は超硬合金で作られるのが一般的であるところ、研削液
の供給孔aや開口c,cの孔加工には非常な困難が伴っ
ていた。That is, although the support surface b of the blade B is generally made of a cemented carbide, it is very difficult to form the supply holes a and the openings c and c for the grinding fluid. Was.
【0008】また、複写機のコピーローラのように軽い
工作物Wの場合、上記研削液の噴射力によって支持面b
から浮き上がってしまい、研削精度が大幅に低下してし
まうおそれがあった。In the case of a light workpiece W such as a copy roller of a copying machine, the supporting surface b
And the grinding accuracy may be greatly reduced.
【0009】そこで、本考案者らは、上記工作物Wの外
周面を傷付ける原因をより詳細に追求すべく種々の試験
・研究を行って、図5に示すように、ブレードBの支持
面b部分に樹脂等の柔らかい材質のチップdを貼り付け
て問題解決を図ってみた。Therefore, the present inventors conducted various tests and studies in order to pursue the cause of damage to the outer peripheral surface of the workpiece W in more detail, and as shown in FIG. I tried to solve the problem by sticking a chip d of a soft material such as resin to the part.
【0010】つまり、従来は上記支持面b部分に超硬合
金が貼付されており、これがため支持面bの硬度が高く
工作物Wの外周面が傷付くとの仮定のもとに、この部分
の硬度を低くしてみたのである。しかし、その結果は、
工作物Wを数個研削するまでは所期の効果が得られるも
のの、それ以後の工作物Wの研削については、上記支持
面b部分の樹脂が損傷され、これが原因でやはり従来と
同様の傷が工作物Wの外周面に付いてしまい、多量生産
には適用不可能であることが判明した。That is, conventionally, a cemented carbide is stuck to the above-mentioned support surface b, and the hardness of the support surface b is so high that the outer peripheral surface of the workpiece W is damaged. I tried to lower the hardness. But the result is
Although the desired effect can be obtained until several workpieces W are ground, in the subsequent grinding of the workpiece W, the resin on the supporting surface b is damaged, and as a result, the same damage as in the conventional case is caused. Has adhered to the outer peripheral surface of the workpiece W, which proved to be unsuitable for mass production.
【0011】本考案は、かかる従来の問題点に鑑みてな
されたものであって、研削中に生ずる切屑や脱落砥粒に
よる工作物表面の損傷を防止でき、しかも多量生産に適
した構造を備えたセンタレス研削盤の工作物支持装置の
提供を目的とする。The present invention has been made in view of the above-mentioned conventional problems, and has a structure suitable for mass production, which can prevent damage to the workpiece surface due to chips or abrasive grains generated during grinding. The object of the present invention is to provide a work support device for a centerless grinding machine.
【0012】[0012]
【課題を解決するための手段】上記目的を達成するた
め、本考案の工作物支持装置は、工作物の側部および下
部の2点が調整車と受台により支持されながら、該工作
物外周が研削砥石車によって研削支持されるセンタレス
研削盤において、前記受台の支持部が、前記工作物下部
の表面をころがり接触状態で支持し、前記受台の基部に
自由回転可能に軸支された1つの支持ローラからなり、
該支持ローラの下部表面が回転ローラによって、下側か
ら支持されてなることを特徴とする。In order to achieve the above-mentioned object, a work supporting apparatus according to the present invention comprises a work supporting device having two sides, a lower part and a lower part, supported by an adjusting wheel and a pedestal. In a centerless grinding machine in which the grinding wheel is supported by a grinding wheel, the supporting portion of the pedestal supports the surface of the lower part of the workpiece in a rolling contact state, and is rotatably supported by the base of the pedestal. Consists of one support roller,
A lower surface of the support roller is supported from below by a rotating roller.
【0013】[0013]
【作用】本考案の工作物支持装置によれば、工作物の下
部表面が、支持ローラによってころがり接触状態で支持
されるため、研削中に生じる切屑や脱落砥粒は、工作物
と回転支持手段との接触部分に侵入しても、ここに止ま
ることなく排除される。しかも、支持ローラの下部表面
が回転ローラによって下側から支持されていることによ
って、支持ローラのたわみを抑制し工作物に円滑な回転
を与えて研削制度を向上させる。According to the work supporting apparatus of the present invention, the lower surface of the work is supported in a rolling contact state by the support roller, so that chips and falling abrasive grains generated during the grinding are removed from the work and the rotating support means. Even if it invades the contact part, it is eliminated without stopping here. In addition, since the lower surface of the support roller is supported from below by the rotating roller, the deflection of the support roller is suppressed and the workpiece is smoothly rotated to improve the grinding accuracy.
【0014】[0014]
【実施例】以下、本考案に係る実施例を図面に基づいて
説明する。本考案に係るセンタレス研削盤の工作物支持
装置を図1および図2に示し、該支持装置1は、具体的
には、複写機のコピーローラや自動二輪車のインナチュ
ーブなどのように被加工表面(外周面)が比較的柔らか
い材質の工作物Wに適したものであって、その主要部と
して支持ローラ2を備えている。3a,3aおよび3
b,3bは上記工作物Wの左右両側(図1において)を
案内するワークガイドであって、研削砥石車Gおよび調
整車Rに対し供給側と排出側の左右位置にそれぞれ設け
られている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a work supporting apparatus for a centerless grinding machine according to the present invention. Specifically, the supporting apparatus 1 has a surface to be processed such as a copy roller of a copying machine or an inner tube of a motorcycle. The outer peripheral surface is suitable for a workpiece W of a relatively soft material, and has a supporting roller 2 as a main part thereof. 3a, 3a and 3
Reference numerals b and 3b denote work guides for guiding the left and right sides (in FIG. 1) of the workpiece W. The work guides are provided at left and right positions on a supply side and a discharge side with respect to the grinding wheel G and the adjustment wheel R, respectively.
【0015】該支持ローラ2は、上記工作物Wの下部表
面をころがり接触状態で支持する回転支持手段であっ
て、中実の金属製円柱形状とされるとともに、受台基部
4に自由回転可能に支持されている。The support roller 2 is a rotary support means for supporting the lower surface of the workpiece W in a rolling contact state, and has a solid metal cylindrical shape and is freely rotatable on the pedestal base 4. It is supported by.
【0016】すなわち、図2に示すように、上記支持ロ
ーラ2の両端には、支軸2a,2aが支持ローラ2と同
軸状に一体に設けられており、これらが軸受5,5によ
り上記受台基部4のワークレスト4a,4aに回転可能
に軸支されている。また、支持ローラ2の中間部分は、
受台基部4に回転可能に軸支された回転ローラ6により
下側から支持されている。これにより、支持ローラが長
い場合にも、回転ローラ6の支持により、支持ローラ2
のたわみを抑制することができ、工作物Wに円滑な回転
を与えて研削制度を向上させることができる。なお、こ
の回転ローラ6の設置数は、支持ローラ2の材質,形状
寸法等に対応して決定される。That is, as shown in FIG. 2, at both ends of the support roller 2, support shafts 2 a, 2 a are integrally provided coaxially with the support roller 2, and these are supported by bearings 5, 5. The work rests 4a of the base 4 are rotatably supported by the work rests 4a. The intermediate portion of the support roller 2 is
It is supported from below by a rotating roller 6 rotatably supported by the cradle base 4. Accordingly, even when the support roller is long, the support roller 2 is supported by the rotation roller 6.
Deflection can be suppressed, and the workpiece W can be smoothly rotated to improve the grinding accuracy. The number of the rotating rollers 6 is determined according to the material, shape and size of the supporting roller 2.
【0017】しかして、以上のように構成された工作物
支持装置1を備えたセンタレス研削盤において、工作物
Wは、供給側のワークガイド3a,3aに沿って研削砥
石車Gと調整車R間に送り込まれ、調整車Rおよび支持
ローラ2によって回転支持されながら、その外周を上記
研削砥石車Gによって研削された後、排出側のワークガ
イド3b,3bに沿って排出される。Thus, in the centerless grinding machine provided with the workpiece support device 1 configured as described above, the workpiece W is moved along the supply side work guides 3a, 3a by the grinding wheel G and the adjusting wheel R. While being rotatably supported by the adjusting wheel R and the support roller 2, the outer periphery thereof is ground by the grinding wheel G, and then discharged along the discharge-side work guides 3b, 3b.
【0018】なお、上記研削中においては、工作物Wの
切屑や研削砥石車Gからの脱落砥粒が生じ、これらの一
部は上記工作物Wと支持ローラ2との接触点P1部分
(図1)にも飛散して侵入する。しかしながら、工作物
Wと支持ローラ2は相互に矢符方向へ回転して、ころが
り接触状態にあるため、これらの接触点P1部分に侵入
した切屑や脱落砥粒は、ここに止まることなく矢符X方
向(研削砥石車Gと反対側)へ円滑に排除されて、調整
車R側のワークガイド3a,3bとの接点P2部分(図
1)にも飛散しない。[0018] Incidentally, during the grinding, the workpiece W falling abrasive grains from chips and grinding the grinding wheel G is caused in the contact point P 1 part of some of these and the workpiece W and the supporting roller 2 ( It also scatters and intrudes into Fig. 1). However, the workpiece W and the supporting roller 2 is rotated mutually in the arrow direction, due to the rolling contact, these contact points P 1 part penetrates the chips and omissions abrasives, arrows without stopping here marks X direction are smoothly eliminated to (grinding wheel G opposite), work guide 3a of the regulating wheel R side, nor scattered contact P 2 portions with 3b (FIG. 1).
【0019】したがって、工作物Wの材質の硬軟を問わ
ず、研削中に生じる切屑等が工作物Wの外周面を傷付け
て研削精度を低下させるというようなことはない。な
お、本考案は図示例に限定されることなく種々設計変更
可能である。例えば、回転支持手段は、図示例のような
円柱状の支持ローラの他、複数の円板状の支持ローラや
エンドレスベルトなどの回転手段も採用することが可能
である。Therefore, no matter whether the material of the workpiece W is hard or soft, chips generated during the grinding do not damage the outer peripheral surface of the workpiece W and lower the grinding accuracy. The present invention is not limited to the illustrated example, and various design changes can be made. For example, in addition to the columnar support roller as shown in the illustrated example, a plurality of disk-like support rollers and an endless belt may be used as the rotation support means.
【0020】また、上記支持ローラ2は、図示例のもの
は中実の金属製円柱形状とされて、工作物Wと金属接触
する構造とされているが、この支持ローラ2の表面を、
アクリル,テフロン等の樹脂皮膜や硬質ゴムなどにより
被覆したり、あるいは中空の円筒状支持ローラとするこ
とも可能である。In the illustrated example, the supporting roller 2 has a solid metal cylindrical shape and has a structure in which it comes into metal contact with the workpiece W.
It is also possible to cover with a resin film such as acryl or Teflon, hard rubber, or the like, or to form a hollow cylindrical support roller.
【0021】[0021]
【考案の効果】以上詳述したように、本考案によれば、
工作物の下部を支持する受台の支持部が、工作物下部の
表面をころがり接触状態で支持する回転支持手段である
から、研削中に生ずる切屑や脱落砥粒による工作物表面
の損傷を防止できる。[Effect of the Invention] As described in detail above, according to the present invention,
Since the supporting part of the pedestal supporting the lower part of the work is a rotating support means that supports the lower part of the work in rolling contact, it prevents damage to the work surface due to chips and falling off abrasive grains generated during grinding it can.
【0022】すなわち、工作物の下部表面が、支持ロー
ラ等の回転支持手段によってころがり接触状態で支持さ
れていると、研削中に生じる切屑や脱落砥粒が工作物と
回転支持手段との接触点部分に飛散して侵入しても、こ
こに止まって噛込むことなく円滑にかつ完全に排除さ
れ、工作物と調整車側のワークガイドとの接触部分にも
飛散することはない。That is, when the lower surface of the workpiece is supported in a rolling contact state by rotating support means such as a support roller, chips generated during grinding and abrasive grains which have fallen off at the point of contact between the workpiece and the rotating support means. Even if it scatters and enters the part, it is smoothly and completely eliminated without stopping and biting here, and does not scatter in the contact part between the workpiece and the work guide on the adjustment wheel side.
【0023】したがって、工作物の材質の硬軟を問わ
ず、研削中に生じる切屑等が工作物の外周面を傷付けて
研削精度を低下させるというようなことはなく、特に、
複写機のコピーローラ(アルミニウム合金製)や自動二
輪車のインナチューブ(表面にクロムメッキが施されて
いる)などのように比較的柔らかい材質を研削する場合
に顕著な効果が発揮されることが試験により判明してい
る。Therefore, regardless of the hardness or softness of the material of the workpiece, chips generated during the grinding do not damage the outer peripheral surface of the workpiece and lower the grinding accuracy.
Tested to show a remarkable effect when grinding relatively soft materials such as copy rollers for copy machines (made of aluminum alloy) and inner tubes for motorcycles (the surface of which is chrome-plated). Is known.
【0024】また、簡単な構造とすることができるの
で、研削液の供給孔や噴射用開口を孔加工する場合のよ
うな製作上の困難もない。さらに、従来のブレードと同
様、複写機のコピーローラのように軽い工作物でも、浮
き上がることなく確実に支持することができるので、高
い研削精度を確保できる。Further, since the structure can be made simple, there is no difficulty in manufacturing such as in the case of drilling the supply hole and the injection opening of the grinding fluid. Further, as in the case of the conventional blade, even a light workpiece such as a copy roller of a copying machine can be reliably supported without being lifted, so that high grinding accuracy can be secured.
【0025】また、工作物と回転支持手段がころがり接
触するため、回転手段の材質の硬軟にかかわらず、これ
ら両者に傷が付きにくく、多量生産用として最適に採用
することができる。しかも、支持ローラの下部表面が回
転ローラによって下側から支持されていることによっ
て、支持ローラのたわみを抑制し工作物に円滑な回転を
与えて研削制度を向上させる。In addition, since the workpiece and the rotation supporting means are in rolling contact with each other, regardless of the material of the rotating means, both of them are hardly damaged, and can be optimally adopted for mass production. In addition, since the lower surface of the support roller is supported from below by the rotating roller, the deflection of the support roller is suppressed and the workpiece is smoothly rotated to improve the grinding accuracy.
【図1】本考案に係る一実施例であるセンタレス研削盤
の工作物支持装置を示す正面断面図である。FIG. 1 is a front sectional view showing a work support device of a centerless grinding machine according to an embodiment of the present invention.
【図2】図1のII−II線に沿って見た同工作物支持
装置の一部断面側面図である。FIG. 2 is a partial cross-sectional side view of the workpiece support device taken along line II-II of FIG.
【図3】従来の一般的なセンタレス研削盤の工作物支持
装置を示す正面図である。FIG. 3 is a front view showing a conventional work support device of a general centerless grinding machine.
【図4】従来の他のセンタレス研削盤の工作物支持装置
を示す正面断面図である。FIG. 4 is a front sectional view showing another conventional work support device for a centerless grinding machine.
【図5】従来のさらに他のセンタレス研削盤の工作物支
持装置を示す正面断面図である。FIG. 5 is a front sectional view showing still another conventional work support device for a centerless grinding machine.
1 工作物支持装置 2 支持ローラ(回転支持手段) 3a,3b ワークガイド 4 受台基部 5 軸受 6 回転ローラ W 工作物 G 研削砥石車 R 調整車 DESCRIPTION OF SYMBOLS 1 Workpiece support apparatus 2 Support roller (rotation support means) 3a, 3b Work guide 4 Cradle base 5 Bearing 6 Rotation roller W Workpiece G Grinding wheel R Adjustment wheel
Claims (1)
と受台により支持されながら、該工作物外周が研削砥石
車によって研削支持されるセンタレス研削盤において、 前記受台の支持部が、前記工作物下部の表面をころがり
接触状態で支持し、前記受台の基部に自由回転可能に軸
支された1つの支持ローラからなり、 該支持ローラの下部表面が回転ローラによって、下側か
ら支持されてなることを特徴とする研削盤の工作物支持
装置。1. A centerless grinding machine in which the outer periphery of a workpiece is ground and supported by a grinding wheel, while two points, a side portion and a lower portion, of the workpiece are supported by an adjustment wheel and a pedestal. Comprises a support roller which supports the surface of the lower part of the workpiece in a rolling contact state and is rotatably supported at the base of the cradle. A workpiece support device for a grinding machine, wherein the workpiece support device is supported by a grinding machine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1991026218U JP2548676Y2 (en) | 1991-03-25 | 1991-03-25 | Workpiece support device for centerless grinding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1991026218U JP2548676Y2 (en) | 1991-03-25 | 1991-03-25 | Workpiece support device for centerless grinding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04115562U JPH04115562U (en) | 1992-10-14 |
JP2548676Y2 true JP2548676Y2 (en) | 1997-09-24 |
Family
ID=31910753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1991026218U Expired - Fee Related JP2548676Y2 (en) | 1991-03-25 | 1991-03-25 | Workpiece support device for centerless grinding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2548676Y2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2558568Y2 (en) * | 1993-03-26 | 1997-12-24 | 日本碍子株式会社 | Centerless grinder for dry grinding of ceramic compacts |
JP2008238302A (en) * | 2007-03-26 | 2008-10-09 | Mrc Composite Products Co Ltd | Manufacturing method of fiber reinforcing plastic pipe body and polishing device of raw pipe |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6312913U (en) * | 1986-06-09 | 1988-01-28 |
-
1991
- 1991-03-25 JP JP1991026218U patent/JP2548676Y2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04115562U (en) | 1992-10-14 |
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