JP2575745Y2 - Cutting blade of full screw bolt cutting machine - Google Patents
Cutting blade of full screw bolt cutting machineInfo
- Publication number
- JP2575745Y2 JP2575745Y2 JP1992055628U JP5562892U JP2575745Y2 JP 2575745 Y2 JP2575745 Y2 JP 2575745Y2 JP 1992055628 U JP1992055628 U JP 1992055628U JP 5562892 U JP5562892 U JP 5562892U JP 2575745 Y2 JP2575745 Y2 JP 2575745Y2
- Authority
- JP
- Japan
- Prior art keywords
- full
- cutting
- bolt
- cutting machine
- screw bolt
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
- B23D35/001—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools cutting members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
- B23D15/04—Shearing machines or shearing devices cutting by blades which move parallel to themselves having only one moving blade
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shearing Machines (AREA)
- Accessories And Tools For Shearing Machines (AREA)
Description
【考案の詳細な説明】[Detailed description of the invention]
【０００１】[0001]
【産業上の利用分野】この考案は、軸の全周にねじ部が
形成された全ねじボルトを剪断する全ねじボルト切断機
の切断刃に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade of a full-thread bolt cutting machine for shearing a full-thread bolt having a thread portion formed all around a shaft.
【０００２】[0002]
【従来の技術】全ねじボルト、たとえばＷ３／８軟鋼は
通常数種類の定尺長さのものが既製品で用意され、ビル
建築等において、照明機器や空調設備等を天井から吊り
下げる際に全ねじナットとともに使用される。この全ね
じボルトは定尺であることから、現場において切断機で
任意の長さに切断している。2. Description of the Related Art Full-thread bolts, for example, W3 / 8 mild steel, are usually available in several types of fixed lengths as off-the-shelf products. Used with screw nuts. Since this full thread bolt is of a fixed size, it is cut to an arbitrary length by a cutting machine on site.
【０００３】一方、全ねじボルト切断機は、電動機の回
転軸を複数の歯車からなる歯車箱で減速し、出力軸であ
るクランクの先端にアームを介在して可動側カッタホル
ダを連結してあるとともに、歯車箱には固定側カッタホ
ルダを設けてある。可動側カッタホルダならびに固定側
カッタホルダには、図５に示すように、可動側切断刃１
ならびに固定側切断刃２をそれぞれ取り付けてある。On the other hand, in a full-thread bolt cutting machine, a rotating shaft of an electric motor is reduced by a gear box composed of a plurality of gears, and a movable cutter holder is connected to an end of a crank as an output shaft via an arm. The gear box is provided with a fixed-side cutter holder. As shown in FIG. 5, the movable-side cutting blade 1 is provided on the movable-side cutter holder and the fixed-side cutter holder.
In addition, fixed-side cutting blades 2 are attached.
【０００４】可動側切断刃１および固定側切断刃２は、
図５および図６に示すように全ねじボルト３のおねじ３
ａのピッチに一致するめねじからなる刃部１ａ，刃部２
ａをそれぞれ形成してあり、固定側切断刃２に全ねじボ
ルト３のねじ山を合わせ、可動側切断刃１を固定側切断
刃２に対してスレチガイ状態に回転して全ねじボルト３
を剪断するものである。The movable cutting blade 1 and the fixed cutting blade 2
As shown in FIG. 5 and FIG.
blade portion 1a, blade portion 2 composed of a female thread matching the pitch of a
a is formed, the thread of the full-thread bolt 3 is aligned with the fixed-side cutting blade 2, and the movable-side cutting blade 1 is rotated in a stretched state with respect to the fixed-side cutting blade 2.
Is to shear.
【０００５】[0005]
【考案が解決しようとする課題】しかしながら、従来の
可動側切断刃１，固定側切断刃２は全ねじボルト３のピ
ッチに一致した形状にめねじを形成してあるため、全ね
じボルト３に剪断荷重がかかると、剪断端部の外周から
バリが突出してヤスリ等で修正しないと全ねじナットが
装着できなかったり、切断刃が欠損する等の不具合が生
じた。However, since the conventional movable cutting blade 1 and fixed cutting blade 2 have female threads formed in a shape corresponding to the pitch of the full screw bolt 3, the conventional cutting blade 1 and the fixed cutting blade 2 have the same configuration. When a shearing load is applied, burrs protrude from the outer periphery of the shearing end, and unless corrected with a file or the like, problems such as the inability to install a full screw nut and the breakage of a cutting blade occur.
【０００６】また、全ねじボルト３の剪断に伴って切り
粉が発生するが、可動側切断刃１および固定側切断刃２
の間に切り粉が詰まることによって可動側切断刃１が固
定側切断刃２に食いつき、作業性が良好ではなかった。[0006] Chips are generated due to the shearing of the full-screw bolt 3, but the movable-side cutting blade 1 and the fixed-side cutting blade 2
When the cutting powder clogged during this time, the movable cutting blade 1 bit into the fixed cutting blade 2 and the workability was not good.
【０００７】この考案は上記問題点に鑑みてなされたも
ので、全ねじボルトの切断後に修正を加えることなく全
ねじナットの使用が可能であるとともに、切断刃の食い
つきを防止する全ねじボルト切断機の切断刃を提供する
ことを目的とするものである。The present invention has been made in view of the above-mentioned problems, and it is possible to use a full-screw nut without making any modification after cutting a full-screw bolt, and to cut a full-screw bolt to prevent the cutting blade from biting. It is an object to provide a cutting blade for a machine.
【０００８】[0008]
【課題を解決するための手段】この考案は上記課題を解
決するため、軸の全周にねじ部を備えた全ねじボルトを
剪断する切断機に装着される一対の切断刃であって、上
記全ねじボルトのねじピッチに一致するめねじが形成さ
れ上記切断機に装着される固定側ヘッドカッタと、刃部
角度が略４５度の内丸形状であるとともに刃先が上記全
ねじボルトのおねじ外径に略一致する曲率半径の凹状円
弧形に形成され上記切断機に装着される可動側ヘッドカ
ッタとからなる全ねじボルト切断機の切断刃を構成し
た。In order to solve the above-mentioned problems, the present invention provides a pair of cutting blades mounted on a cutting machine for shearing a full-thread bolt having a threaded portion on the entire circumference of a shaft, A fixed-side head cutter, which has a female thread corresponding to the thread pitch of the full-thread bolt and is mounted on the cutting machine, an inner circular shape having a blade angle of approximately 45 degrees and a cutting edge having the outer diameter of the external thread of the full-thread bolt A cutting blade of a full-screw bolt cutting machine comprising a concave head having a concave arc shape having a radius of curvature substantially corresponding to that of the above-mentioned cutting machine and comprising a movable head cutter attached to the cutting machine.
【０００９】また、上記両ヘッドカッタ対向面の一方も
しくは両方に切断刃の食いつきを防止する切り粉排除用
溝部を形成した全ねじボルト切断機の切断刃を構成し
た。Further, a cutting blade of a full-screw bolt cutting machine is provided in which a chip-removing groove for preventing biting of the cutting blade is formed on one or both of the head cutter facing surfaces.
【００１０】[0010]
【作用】この考案の切断刃によると、刃部角度が略４５
度の内丸形状に形成され、さらに可動側ヘッドカッタの
刃先が全ねじボルトのおねじ外径に略一致する曲率半径
の凹状円弧形に形成されていることから、全ねじボルト
のねじ山角６０度に対して切れ過ぎることなく、全ねじ
ボルトの剪断端部が略中央に生じて外周からバリが突出
することがない。According to the cutting blade of the present invention, the blade angle is approximately 45.
The inner thread of the full-head bolt is formed in a concave arcuate shape with a radius of curvature substantially matching the external diameter of the external thread. Without being too sharp for 60 degrees, the shear end of the full thread bolt is formed substantially in the center, and the burr does not project from the outer periphery.
【００１１】また、可動側ヘッドカッタ，固定側ヘッド
カッタの対向面の一方もしくは両方に切り粉排除用溝部
を形成してあるので、両ヘッドカッタの間に切り粉が詰
まっても、上記溝部に排除されることから切断刃の食い
つき現象が起きない。Further, since a chip removing groove is formed on one or both of the opposing surfaces of the movable head cutter and the fixed head cutter, even if chips are clogged between the two head cutters, the above-mentioned groove is formed. Since it is eliminated, the biting phenomenon of the cutting blade does not occur.
【００１２】[0012]
【実施例】この考案に係る一実施例を図面に基づいて説
明する。図１はこの考案に係る両ヘッドカッタと全ねじ
ボルトを示す説明図、図２（ａ）は可動側ヘッドカッタ
の斜視図、図２（ｂ）は固定側ヘッドカッタの斜視図、
図３は充電油圧式の全ねじボルト切断機の工具ヘッドを
示す平面図、図４は全ねじボルトの剪断端部を示す説明
図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing both head cutters and a full screw bolt according to the present invention, FIG. 2 (a) is a perspective view of a movable side head cutter, FIG. 2 (b) is a perspective view of a fixed side head cutter,
FIG. 3 is a plan view showing a tool head of a charging hydraulic type full screw bolt cutting machine, and FIG. 4 is an explanatory view showing a sheared end portion of the full screw bolt.
【００１３】最初に、充電油圧式の全ねじボルト切断機
の構造を簡単に説明する。この充電油圧式の全ねじボル
ト切断機は、電動モータに減速機を連結した駆動機構
と、減速機に連結した偏心軸等からなるカムクランク機
構と、偏心軸に係合するプランジャー部ならびにポンプ
用シリンダ室を有する油圧ポンプ部と、工具ヘッドを作
動するピストンを納めたシリンダ室と、オイルタンク，
バッテリパック等が単一工具に配設されている。First, the structure of the charging hydraulic type full screw bolt cutting machine will be briefly described. This charging hydraulic type full screw bolt cutting machine is composed of a drive mechanism in which a reduction gear is connected to an electric motor, a cam crank mechanism including an eccentric shaft and the like connected to the reduction gear, a plunger portion and a pump which engage with the eccentric shaft. A hydraulic pump section having a cylinder chamber for use, a cylinder chamber containing a piston for operating a tool head, an oil tank,
A battery pack and the like are arranged on a single tool.
【００１４】図２（ｂ）に示すように、固定側ヘッドカ
ッタ２０は対向する２辺にそれぞれ刃部２０ａを形成し
てある。この刃部２０ａは全ねじボルト３０のおねじ３
０ａピッチ（図１参照）に略一致するめねじが対称に形
成され、刃部２０ａの消耗，変形，クラックや欠け等が
生じた際に、反転位置替えして交換可能にしてある。ま
た、固定側ヘッドカッタ２０はその中心部に取付用ねじ
孔２０ｂを形成してあり、図３に示すように工具ヘッド
Ａの先端部の所定位置に底部からの六角穴付きボルト４
０で締着される。さらに、その上面には刃部２０ａ，２
０ａの間において幅方向にわたる範囲に直線的帯状の溝
部２０ｃを形成してある。この溝部２０ｃに切り粉が排
除されて、後記する可動側ヘッドカッタ１０との食いつ
きを防止する。As shown in FIG. 2B, the fixed-side head cutter 20 has blade portions 20a formed on two opposite sides. This blade portion 20a is a male screw 3 with a full screw bolt 30.
The female thread substantially matching the 0a pitch (see FIG. 1) is formed symmetrically, and when the blade portion 20a is worn out, deformed, cracked or chipped, the inverted position is changed and replaced. The fixed-side head cutter 20 has a mounting screw hole 20b formed at the center thereof, and a hexagon socket head bolt 4 from the bottom at a predetermined position at the tip end of the tool head A as shown in FIG.
It is fastened at 0. Furthermore, the blade portions 20a, 2
A linear band-shaped groove 20c is formed in a range extending in the width direction between 0a. Chips are removed from the groove 20c, thereby preventing biting with the movable head cutter 10 described later.
【００１５】一方、可動側ヘッドカッタ１０は図２
（ａ）に示すように、一辺に刃部角度が４５度の内丸形
状に形成してあるとともに、全ねじボルト３０のおねじ
外径に略一致する曲率半径の凹状円弧形の刃先１０ａを
形成してある。この刃先１０ａは、その先端に０．５ｍ
ｍの垂直な立ち上がり部１０ａ′を形成してあり、全ね
じボルト３０の剪断部分が切れ過ぎず、かつ剪断端部か
らバリが突出しないような良好な刃先形状にしてある。
さらに、この可動側ヘッドカッタ１０はその中心部に取
付用ねじ孔１０ｂを形成してあり、図３に示すように工
具ヘッドＡのピストンに上部からの六角穴付きボルト４
０で締着される。そして、図１に示すように、下面には
幅方向にわたる範囲に直線的帯状の溝部１０ｃを形成し
て、切り粉を排除するようにしてある。On the other hand, the movable head cutter 10 is shown in FIG.
As shown in (a), a concave arc-shaped blade edge 10a having a radius of curvature substantially equal to the external diameter of the external thread of the full threaded bolt 30 is formed on one side in a round shape with a blade angle of 45 degrees. It is formed. This cutting edge 10a has a tip of 0.5 m
m is formed so that the sheared portion of the full screw bolt 30 is not excessively cut and the burr does not protrude from the sheared end.
Further, the movable head cutter 10 has a mounting screw hole 10b formed at the center thereof, and a hexagon socket head bolt 4 from the top is formed in the piston of the tool head A as shown in FIG.
It is fastened at 0. As shown in FIG. 1, a linear strip-shaped groove 10c is formed on the lower surface in a range extending in the width direction so as to eliminate chips.
【００１６】上記可動側ヘッドカッタ１０と固定側ヘッ
ドカッタ２０を装着した充電油圧式の全ねじボルト切断
機で、全ねじボルト３０を切断する際の操作を説明す
る。An operation for cutting the full screw bolt 30 by the charging hydraulic type full screw bolt cutting machine equipped with the movable head cutter 10 and the fixed side head cutter 20 will be described.
【００１７】まず、工具本体のリリーススイッチを押し
て、可動側ヘッドカッタ１０を下死点まで後退させる。
次に、図１に示すように、全ねじボルト３０を工具ヘッ
ドＡの固定側ヘッドカッタ２０に、ねじ山が正しく噛み
合うように位置させる。この際、図示しない全ねじナッ
トは工具ヘッドＡのプロテクタ４１の上方に移動させて
おく。工具本体の作動スイッチを押して可動側ヘッドカ
ッタ１０を固定側ヘッドカッタ２０方向に進行させ、全
ねじボルト３０を剪断する。その後、リリーススイッチ
を押して可動側ヘッドカッタ１０を下死点まで後退させ
る。First, the release switch of the tool body is pressed to move the movable head cutter 10 backward to the bottom dead center.
Next, as shown in FIG. 1, the full screw bolt 30 is positioned on the fixed side head cutter 20 of the tool head A so that the threads are properly engaged. At this time, the full screw nut (not shown) is moved above the protector 41 of the tool head A. By pressing the operation switch of the tool body, the movable head cutter 10 is advanced in the direction of the fixed head cutter 20, and the full screw bolt 30 is sheared. Then, the release switch is pressed to move the movable head cutter 10 backward to the bottom dead center.
【００１８】図４に示すように、切断された全ねじボル
ト３０の剪断端部（ハッチング部分）は、略中央に楕円
形に形成されるので、外周からバリが突出することがな
く、全ねじナットの取り付け，取り外しも可能になる。
したがって、バリ取りのための加工を必要とせずに全ね
じボルトが切断でき、作業効率が向上する。As shown in FIG. 4, the cut end portion (hatched portion) of the cut full screw bolt 30 is formed in an elliptical shape substantially at the center, so that burrs do not project from the outer periphery, and the full screw The nut can be attached and removed.
Therefore, the full thread bolt can be cut without the need for processing for deburring, and the working efficiency is improved.
【００１９】また、固定側ヘッドカッタ２０の溝部２０
ｃに加えて可動側ヘッドカッタ１０にも溝部１０ｃを形
成してあるので、全ねじボルト３０の剪断に伴う切り粉
が発生しても溝部１０ｃ，２０ｃに排除されるので、可
動側ヘッドカッタ１０の食いつき現象が発生せず、全ね
じボルト３０の剪断作業が阻害されない。The groove 20 of the fixed-side head cutter 20
Since the groove 10c is also formed in the movable head cutter 10 in addition to the cutting head c, even if chips generated due to the shearing of the full screw bolt 30 are generated, they are eliminated by the grooves 10c and 20c. Does not occur, and the shearing operation of the full screw bolt 30 is not hindered.
【００２０】[0020]
【考案の効果】この考案は以上のように構成したので、
全ねじボルト切断機の固定側ヘッドカッタに全ねじボル
トのねじ山を合わせて位置させ、全ねじボルトのねじ山
角６０度に対して、刃部角度が略４５度の内丸形状に形
成され、さらに可動側ヘッドカッタの刃先が全ねじボル
トのおねじ外径に略一致する曲率半径の凹状円弧形に形
成した可動側ヘッドカッタが移動して剪断すると、全ね
じボルトが切れ過ぎることなく、剪断端部が略中央に生
じて外周からバリが突出することがないので、全ねじナ
ットの使用に不具合が生じない。[Effects of the invention] Since the invention was constructed as described above,
The screw thread of the full screw bolt is aligned with the fixed side head cutter of the full screw bolt cutting machine and positioned, and the thread angle of the full screw bolt is 60 degrees, and the blade angle is formed in an inner round shape of about 45 degrees, Furthermore, when the movable head cutter, whose blade edge of the movable head cutter is formed into a concave arc shape with a radius of curvature substantially matching the external thread diameter of the full screw bolt, moves and shears, the full screw bolt is not cut too much, Since the shear end does not occur substantially at the center and the burr does not protrude from the outer periphery, there is no problem in using the full screw nut.
【００２１】また、可動側ヘッドカッタ，固定側ヘッド
カッタの一方もしくは両方に切り粉排除用の溝部を形成
したので、全ねじボルトの剪断に伴って発生する切り粉
が溝部に排除でき、可動側ヘッドカッタの食いつき現象
が惹起されることがなく、剪断作業に支障を来すことが
ない。Further, since a groove for removing chips is formed in one or both of the movable head cutter and the fixed side head cutter, chips generated due to shearing of the full screw bolt can be removed in the groove. The biting phenomenon of the head cutter does not occur, and there is no hindrance to the shearing operation.
【図１】この考案に係る可動側ヘッドカッタ，固定側ヘ
ッドカッタと全ねじボルトを示す説明図である。FIG. 1 is an explanatory view showing a movable-side head cutter, a fixed-side head cutter, and a full-thread bolt according to the present invention.
【図２】（ａ）は可動側ヘッドカッタの斜視図、（ｂ）
は固定側ヘッドカッタの斜視図である。FIG. 2A is a perspective view of a movable head cutter, and FIG.
FIG. 4 is a perspective view of a fixed-side head cutter.
【図３】この考案に係る充電油圧式の全ねじボルト切断
機の工具ヘッドを示す平面図である。FIG. 3 is a plan view showing a tool head of the charging hydraulic full-thread bolt cutting machine according to the present invention.
【図４】全ねじボルトの剪断端部を示す説明図である。FIG. 4 is an explanatory view showing a sheared end portion of the full thread bolt.
【図５】従来例にかかる可動側切断刃と固定側切断刃を
示す斜視図である。FIG. 5 is a perspective view showing a movable cutting blade and a fixed cutting blade according to a conventional example.
【図６】従来の可動側切断刃と固定側切断刃で全ねじボ
ルトを切断する状態を示す断面図である。FIG. 6 is a cross-sectional view showing a state where a full-thread bolt is cut by a conventional movable-side cutting blade and a fixed-side cutting blade.
Ａ：工具ヘッド １０：可動側ヘッドカッタ １０ａ：刃部 １０ｃ：溝部 ２０：固定側ヘッドカッタ ２０ａ：刃部 ２０ｃ：溝部 ３０：全ねじボルト ３０ａ：おねじ ４０：六角穴付きボルト A: Tool head 10: Movable head cutter 10a: Blade part 10c: Groove part 20: Fixed side head cutter 20a: Blade part 20c: Groove part 30: Full screw bolt 30a: Male screw 40: Hex socket bolt
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B23D 23/00 B23D 29/00 B23D 35/00──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B23D 23/00 B23D 29/00 B23D 35/00
Claims (2)
を剪断する切断機に装着される一対の切断刃であって、 上記全ねじボルトのねじピッチに一致するめねじが形成
され上記切断機に装着される固定側ヘッドカッタと、刃
部角度が略４５度の内丸形状であるとともに刃先が上記
全ねじボルトのおねじ外径に略一致する曲率半径の凹状
円弧形に形成され上記切断機に装着される可動側ヘッド
カッタとからなることを特徴とする全ねじボルト切断機
の切断刃。1. A pair of cutting blades mounted on a cutting machine for shearing a full threaded bolt having a threaded portion all around a shaft, wherein a female thread corresponding to a thread pitch of the full threaded bolt is formed. A fixed-side head cutter to be mounted on the cutting machine, and an inner circular shape having a blade angle of approximately 45 degrees and a cutting edge formed in a concave arc shape having a radius of curvature substantially coinciding with the external diameter of the external thread of the full-thread bolt. A cutting blade for a full-screw bolt cutting machine, comprising a movable head cutter mounted on the cutting machine.
は両方に切断刃の食いつきを防止する切り粉排除用溝部
を形成したことを特徴とする請求項１記載の全ねじボル
ト切断機の切断刃。2. A cutting blade for a full-screw bolt cutting machine according to claim 1, wherein a swarf removing groove for preventing biting of the cutting blade is formed on one or both of the opposed surfaces of the two head cutters.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992055628U JP2575745Y2 (en) | 1992-08-07 | 1992-08-07 | Cutting blade of full screw bolt cutting machine |
| KR2019930010251U KR940007296U (en) | 1992-08-07 | 1993-06-11 | Cutting blade of full thread bolt cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992055628U JP2575745Y2 (en) | 1992-08-07 | 1992-08-07 | Cutting blade of full screw bolt cutting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0617819U JPH0617819U (en) | 1994-03-08 |
| JP2575745Y2 true JP2575745Y2 (en) | 1998-07-02 |
Family
ID=13004050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992055628U Expired - Lifetime JP2575745Y2 (en) | 1992-08-07 | 1992-08-07 | Cutting blade of full screw bolt cutting machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2575745Y2 (en) |
| KR (1) | KR940007296U (en) |
-
1992
- 1992-08-07 JP JP1992055628U patent/JP2575745Y2/en not_active Expired - Lifetime
-
1993
- 1993-06-11 KR KR2019930010251U patent/KR940007296U/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR940007296U (en) | 1994-04-12 |
| JPH0617819U (en) | 1994-03-08 |
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