JPH03246832A - Weld contact - Google Patents
Weld contactInfo
- Publication number
- JPH03246832A JPH03246832A JP4346290A JP4346290A JPH03246832A JP H03246832 A JPH03246832 A JP H03246832A JP 4346290 A JP4346290 A JP 4346290A JP 4346290 A JP4346290 A JP 4346290A JP H03246832 A JPH03246832 A JP H03246832A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- contact
- conductive plate
- welding surface
- brazing
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 claims abstract description 75
- 238000005219 brazing Methods 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 abstract description 28
- 238000010276 construction Methods 0.000 abstract 1
- 230000004927 fusion Effects 0.000 abstract 1
- 239000000945 filler Substances 0.000 description 12
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 239000000155 melt Substances 0.000 description 6
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 229910000570 Cupronickel Inorganic materials 0.000 description 4
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- -1 silver-nickel Chemical compound 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Contacts (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電磁継電器や電磁接触器に使用する溶接接点
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to welding contacts used in electromagnetic relays and electromagnetic contactors.
従来の溶接接点として、第３図のものが存在する。 As a conventional welding contact, the one shown in FIG. 3 exists.
溶接接点１０は、その接点部１０ａが、断面略半円状を
なしてフープ状に形成されていたものを適当な長さに切
断したものである。組成は、通常の場合、接点面となる
上層部が銀または銀ニッケル等の銀合金で、下層部が銅
ニッケル等の銅合金からなっている。その下層部の下面
がリン青銅等からなる導電板Ｐへの溶接面１０ｂであり
、その中央には長手方向に沿って断面略半円である突条
の突出部１０ｃが設けられている。The welding contact 10 has a contact portion 10a formed in a hoop shape with a substantially semicircular cross section and then cut to an appropriate length. In general, the upper layer, which serves as the contact surface, is made of silver or a silver alloy such as silver-nickel, and the lower layer is made of a copper alloy such as copper-nickel. The lower surface of the lower layer is a welding surface 10b to the conductive plate P made of phosphor bronze or the like, and a protruding portion 10c of a protruding strip having a substantially semicircular cross section is provided in the center along the longitudinal direction.
この溶接接点１０は、次のようにして導電板Ｐに溶接さ
れる。溶接接点１０は、溶接面１０ｂが導電板Ｐに対し
略平行とし、突出部１０ｃを導電板Ｐに当接させた状態
で、接点部１０ａの上面及び導電板Ｐの下面の両方向か
ら加圧しながら電流を流す、そうすると、突出部１０ｃ
の導電板Ｐへの当接部は、接触面積が小さくつまり電気
抵抗が大きいので、ジュール熱により突出部１０ｃ及び
それが当接する導電板Ｐの一部が溶融して溶接接点１０
が導電板Ｐに溶接される。This welding contact 10 is welded to the conductive plate P in the following manner. The welding contact 10 is made so that the welding surface 10b is approximately parallel to the conductive plate P, and the protrusion 10c is in contact with the conductive plate P, while applying pressure from both the upper surface of the contact portion 10a and the lower surface of the conductive plate P. When a current is passed, the protrusion 10c
Since the contact area with the conductive plate P is small, that is, the electrical resistance is large, the protrusion 10c and the part of the conductive plate P that it comes into contact with melt due to Joule heat, and the welding contact 10
is welded to the conductive plate P.
一方、他の溶接接点の従来例として第４図のものも存在
する。On the other hand, there is also the one shown in FIG. 4 as another conventional example of a welded contact.
溶接接点２０は、その接点部２０ａが、先の例のような
突出部を溶接面２０ｂに設けていないという相違がある
だけで、その他の形状や組成は溶接接点１０と同じであ
る。The welding contact 20 has the same shape and composition as the welding contact 10, except that the contact portion 20a does not have a protruding portion on the welding surface 20b as in the previous example.
従って、この溶接接点２０を導電板Ｐに溶接する場合は
、その溶接面２０ｂと略等しい形状のろう材２０ｃを溶
接面２０ｂと導電板Ｐの間に介装させている。このろう
材２０ｃは、溶接面２０ｂつまり下層部を形成する銅ニ
ッケル等の銅合金よりも融点がはるかに低く約半分の材
料によりできているため、接点部２０ａの上面及び導電
板Ｐの下面の両方向から加圧しながら電流を流すと、ジ
ュール熱によりろう材２０ｃが溶融し、溶接接点２０が
導電板Ｐにろう付けにより溶接される。Therefore, when this welding contact 20 is welded to the conductive plate P, a brazing material 20c having a shape substantially the same as the welding surface 20b is interposed between the welding surface 20b and the conductive plate P. This brazing filler metal 20c has a much lower melting point than the copper alloy such as copper nickel that forms the welding surface 20b, that is, the lower layer, and is made of about half the material. When current is applied while applying pressure from both directions, the brazing material 20c is melted by Joule heat, and the welding contact 20 is welded to the conductive plate P by brazing.
上記した従来の溶接接点の内、第３図に示す溶接接点１
０が最も一般的に使用されている。しかしながら、比較
的大きな電流を開閉するような場合、接点の長寿命化を
図るため、導電板Ｐの材料としてベリリウム銅等の低電
気抵抗でかつ高熱伝導性のものを使用することが多くな
って来ている。Among the conventional welded contacts mentioned above, welded contact 1 shown in Fig. 3
0 is most commonly used. However, when switching relatively large currents, materials with low electrical resistance and high thermal conductivity, such as beryllium copper, are increasingly used as the material for the conductive plate P in order to extend the life of the contacts. It is coming.
かかる場合にあっては、溶接接点１０の導電板Ｐへの当
接部の電気抵抗はより小さくなり、そこで発生するジュ
ール熱も少なくなる。しかも導電板Ｐは高熱伝導性であ
るので、そのジュール熱は拡散し易く、溶接に寄与する
ジュール熱はさらに少なくなる。従って、溶接接点１０
の突出部１０ｃ及びそれが当接する導電板Ｐの一部は溶
融しにくくなるため、結果として溶接ができないという
問題が発生することがある。In such a case, the electrical resistance of the welding contact 10 in contact with the conductive plate P becomes smaller, and the Joule heat generated therein is also reduced. Moreover, since the conductive plate P has high thermal conductivity, its Joule heat is easily diffused, and the Joule heat contributing to welding is further reduced. Therefore, welding contact 10
The protruding portion 10c and a portion of the conductive plate P that it contacts become difficult to melt, and as a result, a problem may arise in that welding cannot be performed.
この対策の一つとして使用されているのが、もう一方の
従来例つまり第４図に示す溶接接点２０である。The other conventional example, that is, a welded contact 20 shown in FIG. 4 is used as one of the countermeasures against this problem.
この場合、溶接接点２０には突出部がなく、しかも導電
板Ｐが低電気抵抗でかつ高熱伝導性の材料となっている
ので、溶接に寄与するジュール熱は少ないが、溶接接点
２０の溶接面２０ｂと導電板Ｐの間にそれらよりも融点
がはるかに低いろう材２０ｃを介装させているので、ろ
う材２０ｃが溶融してろう付けによる溶接が可能である
。しかしながら、ろう材２０ｃは、溶接接点２０ととも
に導電板Ｐの所定の溶接位置に位置決めするという作業
が必要であり、特に接点が小型になるとそれが困難とな
り、その結果溶接強度も低下するといった溶接性に問題
が発生することがある。また、ろう材２０ｃは一つの部
材としである程度の厚みが必要であるので、溶接後に溶
接面２０ｂから外部へはみ出したり、接点部２０ａの高
さも一定になりにくい。In this case, since the welding contact 20 has no protruding part and the conductive plate P is made of a material with low electrical resistance and high thermal conductivity, there is little Joule heat contributing to welding, but the welding surface of the welding contact 20 Since the brazing filler metal 20c, which has a much lower melting point than those of them, is interposed between the conductive plate 20b and the conductive plate P, the brazing filler metal 20c melts and welding by brazing is possible. However, it is necessary to position the brazing filler metal 20c at a predetermined welding position on the conductive plate P together with the welding contact 20, which becomes difficult especially when the contact becomes small, and as a result, the welding strength decreases. problems may occur. Further, since the brazing filler metal 20c is required to have a certain thickness as a single member, it may protrude from the welding surface 20b to the outside after welding, and the height of the contact portion 20a may be difficult to maintain.
本発明は、上記事由に鑑みてなしたもので、その目的と
するところは、溶接接点を導電板に溶接する際、接点の
長寿命化を図るため導電板の材料として低電気抵抗でか
つ高熱伝導性のものを使用する場合においても、作業性
が良くしかも溶接性にも優れた溶接接点を提供すること
にある。The present invention has been made in view of the above-mentioned reasons, and its purpose is to use a material of low electrical resistance and high heat as a material for the conductive plate in order to prolong the life of the contact when welding the welding contact to the conductive plate. It is an object of the present invention to provide a welding contact which has good workability and excellent weldability even when a conductive material is used.
上記した課題を解決するために、本発明の溶接接点は、
導電板に溶接して使用する溶接接点において、その溶接
面にろう材で形成された突出部を設けた構成にしである
。In order to solve the above problems, the welding contact of the present invention is a welding contact used by welding to a conductive plate, and has a structure in which a protrusion made of a brazing metal is provided on the welding surface.
本発明によれば、接点の長寿命化を図るため導電板の材
料として低電気抵抗でかつ高熱伝導性のものを使用する
場合においても、溶接接点の溶接面にそれよりはるかに
融点の低いろう材で形成された突出部を設けているので
、その突出部で発生するジュール熱でろう材が溶融し溶
接面と導電板の間に薄い層を形成してろう付は溶接され
ることになり、作業性が良くしかも溶接性にも優れたも
のとすることができる。According to the present invention, even when a material with low electrical resistance and high thermal conductivity is used for the conductive plate in order to extend the life of the contact, the welding surface of the welded contact is coated with a wax having a much lower melting point than that of the conductive plate material. Since there is a protrusion made of metal, the Joule heat generated at the protrusion melts the brazing metal and forms a thin layer between the welding surface and the conductive plate. It can be made to have good properties and excellent weldability.
本発明の一実施例を第１図及び第２図に基づいて以下に
説明する。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
溶接接点１は、その接点部１ａが、断面略半円状をなし
てフープ状に形成されていたものを適当な長さに切断し
たものである。組成は、通常の場合、接点面となる上層
部が銀または銀ニッケル等の銀合金で、下層部が銅ニッ
ケル等の銅合金からなっている。その下層部の下面が導
電板Ｐへの溶接面１ｂであり、その中央にはフープの長
手方向に沿って断面略半円状の満１ｄが設けである。こ
の溝１ｄに径が０．１〜０．２Ｍ程度の棒状のろう材１
ｃを第１図（ｂ）に示す如く矢印方向から圧入等で埋め
込み、その径の半分程度を溶接面１ｂから突出させ突出
部１ｅを形成している。従って、この溶接接点１の形状
は、従来例で述べた最も一般的に使用されている第３図
の溶接接点１０と殆ど同しものである。The welding contact 1 has a contact portion 1a formed in a hoop shape with a substantially semicircular cross section and then cut to an appropriate length. In general, the upper layer, which serves as the contact surface, is made of silver or a silver alloy such as silver-nickel, and the lower layer is made of a copper alloy such as copper-nickel. The lower surface of the lower layer is the welding surface 1b to the conductive plate P, and in the center thereof, a substantially semicircular cross section 1d is provided along the longitudinal direction of the hoop. A rod-shaped brazing material 1 with a diameter of about 0.1 to 0.2M is inserted into this groove 1d.
c is embedded by press-fitting or the like from the direction of the arrow as shown in FIG. 1(b), and approximately half of its diameter protrudes from the welding surface 1b to form a protrusion 1e. Therefore, the shape of this welding contact 1 is almost the same as the most commonly used welding contact 10 shown in FIG. 3 described in the conventional example.
ろう材１ｃは、銀や銅等よりなる材料で、接点部１ａの
溶接面１ｂつまり下層部を形成する銅ニッケル等の銅合
金よりも融点がはるかに低く約半分となっている。The brazing filler metal 1c is made of silver, copper, or the like, and has a melting point much lower than that of a copper alloy such as copper nickel that forms the welding surface 1b of the contact portion 1a, that is, the lower layer, about half that.
なお、上記説明において、溶接接点１はフープ状のもの
を適当な長さに切断して後、接点部１ａの溝１ｄに棒状
のろう材１ｃを埋め込んで形成されているが、接点部１
ａとろう材１ｃの両方をフープ状として溝１ｄにそのろ
う材１ｃを埋め込んだ後、適当な長さに切断して溶接接
点ｌを形成してもよい。In the above description, the welding contact 1 is formed by cutting a hoop-shaped piece to an appropriate length and then embedding a bar-shaped brazing material 1c in the groove 1d of the contact part 1a.
The welding contact 1 may be formed by forming both a and the brazing material 1c into a hoop shape, embedding the brazing material 1c in the groove 1d, and then cutting it to an appropriate length.
この溶接接点１は、次のようにして導電板Ｐに溶接され
る。第２図において、導電板Ｐは、ヘリリウム銅等の低
電気抵抗でかつ高熱伝導性の材料でできている。そして
、溶接面１ｂが前記導電板Ｐに対し略平行とし、突出部
１ｅを導電板Ｐに当接させた状態で、接点部１ａの上面
及び導電板Ｐの下面の両方向から加圧しながら電流を流
す。そうすると、突出部１ｅの導電板Ｐへの当接部は、
接触面積が小さくつまり電気抵抗が大きいためにジュー
ル熱は発生するが、導電板Ｐが低電気抵抗でかつ高熱伝
導性の材料でできているので、従来例で説明したように
溶接に寄与するジュール熱は少なくなる。しかしながら
、突出部１ｅが融点の低いろう材１ｃで形成されている
ので、ろう材１ｃが溶融して溶接接点１の溶接面１ｂと
導電板Ｐの間に流れ込み薄い層を形成することにより、
溶接接点１が導電板Ｐにろう付は溶接される。This welding contact 1 is welded to the conductive plate P in the following manner. In FIG. 2, the conductive plate P is made of a material with low electrical resistance and high thermal conductivity, such as helium copper. Then, with the welding surface 1b substantially parallel to the conductive plate P and the protrusion 1e in contact with the conductive plate P, a current is applied while applying pressure from both the upper surface of the contact portion 1a and the lower surface of the conductive plate P. Flow. Then, the contact portion of the protrusion 1e to the conductive plate P is
Joule heat is generated due to the small contact area and high electrical resistance, but since the conductive plate P is made of a material with low electrical resistance and high thermal conductivity, the Joule heat that contributes to welding as explained in the conventional example The fever will be less. However, since the protrusion 1e is formed of the brazing filler metal 1c having a low melting point, the brazing filler metal 1c melts and flows between the welding surface 1b of the welding contact 1 and the conductive plate P to form a thin layer.
A welding contact 1 is brazed to a conductive plate P.
例えば、接点部１ａの巾が０．４１１ｎの場合、溶接後
のろう材の層は約１０μｍと薄くなる。For example, if the width of the contact portion 1a is 0.411n, the layer of brazing metal after welding will be as thin as about 10 μm.
以上の如く、かかる溶接接点１にあっては、接点の長寿
命化を図るため導電板Ｐの材料として低電気抵抗でかつ
高熱伝導性のものを使用する場合においても、溶接面１
ｂにそれよりはるかに融点の低いろう材１ｃで形成され
た突出部１ｅを設けているので、その突出部１ｅで発生
するジュール熱でろう材１ｃが溶融し溶接面１ｂと導電
板Ｐの間に薄い層を形成してろう付は溶接されることに
なり、従来例で述べた最も一般的に使用されている第３
図の溶接接点１０の形状を変えずに、作業性が良くしか
も溶接性にも優れたものとすることができる。As described above, in this welding contact 1, even when a material with low electrical resistance and high thermal conductivity is used as the material of the conductive plate P in order to extend the life of the contact, the welding surface 1
Since the protrusion 1e formed of the brazing filler metal 1c with a much lower melting point is provided at b, the Joule heat generated at the protrusion 1e melts the brazing filler metal 1c, causing a gap between the welding surface 1b and the conductive plate P. Brazing is performed by forming a thin layer on the
Good workability and excellent weldability can be achieved without changing the shape of the welding contact 10 shown in the figure.
また、本実施例の場合、突出部１ｅが融点の低いろう材
１ｃで形成されているので、ろう材ＩＣが溶融して溶接
接点１の溶接面１ｂと導電板Ｐの間に流れ込み薄い層を
形成するため、ろう材が一つの部材としである程度の厚
みが必要である第４図の従来例の場合のように、ろう材
が溶接面１ｂからはみ出すということも殆どなく、しか
も接点部１ａの高さも一定にすることができる。In addition, in the case of this embodiment, since the protrusion 1e is formed of the brazing filler metal 1c having a low melting point, the brazing filler metal IC melts and flows between the welding surface 1b of the welding contact 1 and the conductive plate P, forming a thin layer. Unlike the conventional example shown in Fig. 4, in which the brazing material is required to be one member and have a certain thickness, the brazing material hardly protrudes from the welding surface 1b, and moreover, the brazing material does not protrude from the welding surface 1b. The height can also be kept constant.
なお、上記実施例では、導電板Ｐが低電気抵抗でかつ高
熱伝導性の材料を使用する場合について述べたが、溶接
接点の下層部が同じような性質を有する材料とした場合
においても同様の効果が得られるのは勿論である。In the above embodiment, the conductive plate P is made of a material with low electrical resistance and high thermal conductivity. Of course, it is effective.
本発明の溶接接点は、上記のように構成したから、接点
の長寿命化を図るため導電板の材料として低電気抵抗で
かつ高熱伝導性のものを使用する場合においても、溶接
面にそれよりはるかに融点の低いろう材で形成された突
出部を設けているので、その突出部で発生するジュール
熱でろう材が熔融し溶接面と導電板の間に薄い層を形成
してろう付は溶接されることになり、作業性が良くしか
も溶接性にも優れたものとすることができる。Since the welding contact of the present invention is constructed as described above, even when a material with low electrical resistance and high thermal conductivity is used as the conductive plate material in order to extend the life of the contact, the welding surface is Since the protrusion is made of a brazing metal with a much lower melting point, the Joule heat generated at the protrusion melts the brazing metal, forming a thin layer between the welding surface and the conductive plate, and the welding is completed. Therefore, it is possible to achieve good workability and excellent weldability.
第１図は、本発明の一実施例を示す斜視図、第２図は、
同上の溶接作業説明図、
第３図は、従来例の斜視図、
第４図は、他の従来例の斜視図。
１−溶接接点、
ｌａ−一・接点部、
１ｂ−溶接面、
１ｃ−ろう材、
ｌｄ−一溝、
ｌｅ−一突出部、
Ｐ−−一導電板。FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a perspective view of a conventional example; FIG. 4 is a perspective view of another conventional example. 1-welding contact, la--contact part, 1b-welding surface, 1c-brazing metal, LD--groove, LE--protrusion, P---conductive plate.
Claims (1)
の溶接面にろう材で形成された突出部を設けたことを特
徴とする溶接接点。(1) A welding contact used by welding to a conductive plate, characterized in that a protrusion made of a brazing metal is provided on the welding surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4346290A JPH0750577B2 (en) | 1990-02-23 | 1990-02-23 | Welding contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4346290A JPH0750577B2 (en) | 1990-02-23 | 1990-02-23 | Welding contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03246832A true JPH03246832A (en) | 1991-11-05 |
| JPH0750577B2 JPH0750577B2 (en) | 1995-05-31 |
Family
ID=12664379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4346290A Expired - Lifetime JPH0750577B2 (en) | 1990-02-23 | 1990-02-23 | Welding contact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750577B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018117021A1 (en) * | 2016-12-19 | 2018-06-28 | 田中貴金属工業株式会社 | Tape-like contact and method for manufacturing same |
-
1990
- 1990-02-23 JP JP4346290A patent/JPH0750577B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018117021A1 (en) * | 2016-12-19 | 2018-06-28 | 田中貴金属工業株式会社 | Tape-like contact and method for manufacturing same |
| KR20190062576A (en) * | 2016-12-19 | 2019-06-05 | 다나카 기킨조쿠 고교 가부시키가이샤 | TAPE TYPE CONNECTOR AND METHOD |
| TWI675391B (en) * | 2016-12-19 | 2019-10-21 | 日商田中貴金屬工業股份有限公司 | Tape-shaped contact member, method for manufacturing tape-shaped contact member, chip- shaped contact members, method for manufacturing electric contact and relay |
| JPWO2018117021A1 (en) * | 2016-12-19 | 2019-10-24 | 田中貴金属工業株式会社 | Tape-shaped contact material and manufacturing method thereof |
| US11329405B2 (en) | 2016-12-19 | 2022-05-10 | Tanaka Kikinzoku Kogyo K.K. | Tape-shaped contact member and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0750577B2 (en) | 1995-05-31 |
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