JP3305593B2 - Working part support structure of hydraulic working machine - Google Patents
Working part support structure of hydraulic working machineInfo
- Publication number
- JP3305593B2 JP3305593B2 JP27246196A JP27246196A JP3305593B2 JP 3305593 B2 JP3305593 B2 JP 3305593B2 JP 27246196 A JP27246196 A JP 27246196A JP 27246196 A JP27246196 A JP 27246196A JP 3305593 B2 JP3305593 B2 JP 3305593B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- working
- boss
- machine
- mounting
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
- E02F3/382—Connections to the frame; Supports for booms or arms
- E02F3/384—Connections to the frame; Supports for booms or arms the boom being pivotable relative to the frame about a vertical axis
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2275—Hoses and supports therefor and protection therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、パワーショベル等
油圧作業機の作業部支持構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working part support structure for a hydraulic working machine such as a power shovel.
【０００２】[0002]
【従来の技術】従来、パワーショベルのバケット等を有
する作業部の支持構造は、図５に示すように機台２の前
端部に上下方向に長い縦筒状のボス２０ａを固着してボ
ス部２０を構成するとともに、作業部４を支持する取付
ブラケット３の取付片３１，３２を上記ボス２０ａを上
下から挟持した状態に嵌挿して両者を取付ピン３０によ
ってスイング回動可能に連結し、作業部４を作動させる
油圧ホース（４７ａ，４８ａ，４９ａ）を機台２内から
ボス２０ａの側方を周回させるとともに、取付ブラケッ
ト３内を通して作業部４に設けられる各油圧シリンダー
と連結させるようにしている。2. Description of the Related Art Conventionally, a supporting structure of a working unit having a bucket or the like of a power shovel is provided by attaching a vertically long boss 20a to a front end of a machine base 2 as shown in FIG. 20, and the fitting pieces 31, 32 of the mounting bracket 3 that supports the working part 4 are inserted in a state where the boss 20 a is sandwiched from above and below, and both are swingably connected by the mounting pins 30. Hydraulic hoses (47a, 48a, 49a) for operating the part 4 are circulated from the inside of the machine base 2 to the sides of the boss 20a, and are connected to the hydraulic cylinders provided on the working part 4 through the mounting bracket 3. I have.
【０００３】[0003]
【発明が解決しようとする課題】然し、上記従来の作業
部の支持構造は、取付ブラケット３がスイングシリンダ
の作動によって、取付ピン３０を中心に左右に旋回動作
するとき、この取付ブラケット３の動きに伴って左右に
屈伸変曲する油圧ホース（４７ａ，４８ａ，４９ａ）
が、取付ピン３０を挿通支持するように大きな径に形成
されたボス２０ａに強く摺接することにより、早期に損
耗等を発生し易い欠点があるとともに、油圧ホースは上
記屈伸変曲に伴い機台２に開口する開口部内を出入り動
作する際に、この開口部の内側に強く接して油圧ホース
（４７ａ，４８ａ，４９ａ）の円滑な出入り作動に支障
を与えたり、著しい損耗を生ずる等の問題がある。However, when the mounting bracket 3 is swiveled left and right around the mounting pin 30 by the operation of the swing cylinder, the mounting bracket 3 moves in the conventional working part support structure. Hydraulic hose (47a, 48a, 49a) that bends and flexes right and left with the
However, there is a drawback that the boss 20a formed with a large diameter so as to insert and support the mounting pin 30 is liable to cause early wear and the like. In the operation of moving in and out of the opening that opens into the opening 2, there is a problem that the hydraulic hose (47a, 48a, 49a) comes into strong contact with the inside of the opening and hinders smooth operation of the hydraulic hose (47a, 48a, 49a), or causes significant wear. is there.
【０００４】[0004]
【課題を解決するための手段】 上記従来の問題を解決
するために請求項１に記載の本発明に係る油圧作業機の
作業部支持構造は、機台２のボス部２０に対し作業部４
を支持する取付ブラケット３を縦軸の取付ピン３０を介
して旋回可能に取付けるとともに、上記作業部４を作動
させる油圧ホースを機台２内及び取付ブラケット３内を
通し、かつ、前記ボス部２０を、上ボス部２１と下ボス
部２２とに離間させて分割形成させた油圧作業機におい
て、前記上ボス部２１と前記下ボス部２２との間におい
て、前記取付ピン３０に油圧ホース案内用の回転ローラ
３５を回転可能に軸装して成るものである。 また、請求
項２に記載の本発明に係る油圧作業機の作業部支持構造
は、ボス部２０の基部側に形成される油圧ホース挿通用
の開口部２Ｋの両側内面に油圧ホース案内用の滑動部材
２５を形成して成る請求項１記載の油圧作業機の作業部
支持構造である。 According to the first aspect of the present invention, there is provided a working part support structure for a hydraulic working machine, comprising:
The mounting bracket 3 for supporting is attached pivotably via the mounting pin 30 of vertical axis, through the machine base 2 hydraulic hoses for operating the working portion 4 and the mounting bracket 3 a, and the boss portion 20 With the upper boss 21 and the lower boss
In a hydraulic working machine divided and formed separately from the upper boss portion 22, the upper boss portion 21 and the lower boss portion 22 are separated from each other.
A rotary roller for guiding the hydraulic hose to the mounting pin 30;
35 is rotatably mounted on the shaft. Also, billing
Item 2. A working part support structure for a hydraulic working machine according to the present invention described in Item 2.
Is for inserting a hydraulic hose formed on the base side of the boss 20.
Sliding members for guiding hydraulic hoses on the inner surfaces on both sides of the opening 2K
25. The working part of the hydraulic working machine according to claim 1, wherein the working part is formed.
It is a support structure.
【０００５】[0005]
【発明の実施の形態】本発明の一実施形態を図面に基づ
いて説明する。図１において、１は作業機の１例として
示すパワーショベルであり、クローラ式の走行装置１ａ
の基柱１ｂに旋回可能に設けられた機台２の前方に取付
ブラケット（スイングポスト）３を介してショベル４５
等の作業部４を設けるとともに、後方に操縦部５とタン
ク部６を機幅の左右に併設して原動部７を順次配設して
構成されている。An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a power shovel shown as an example of a working machine, which is a crawler type traveling device 1a.
Excavator 45 via mounting bracket (swing post) 3 in front of machine base 2 rotatably provided on base column 1b of the vehicle.
And the like, and a control unit 5 and a tank unit 6 are provided at the rear side of the machine width and left and right, and a driving unit 7 is sequentially arranged.
【０００６】上記操縦部５は機台２の上部に着脱可能に
敷設した床板（フロアー）８の後方中央部にシート部
（座席）５ａを設け、この両側で機台２から立設支持す
る操縦支枠５ｂ，５ｃに作業部４及び機台２等の操作を
司る操作レバー５Ｌ，５Ｒを設置するとともに、シート
５ａの前方で乗降空間部５Ｋを隔てた機台２の前端部に
機体の操向操作を司る操向レバー５Ｓを上方に向けて立
設し、その基部の側方に図示しないアタッチメント作業
機等の操作を司るフートペダル５Ｆ等が設置される前面
操舵部５ｄを配置している。なお、図１はパワーショベ
ルを、図２はブレード作業機を示しているが、操縦部５
は同様な構成になっている。The control section 5 is provided with a seat portion (seat) 5a at the rear central portion of a floor plate (floor) 8 which is detachably laid on the upper portion of the machine base 2, and the control section 5 stands upright from the machine base 2 on both sides. Operation levers 5L and 5R for controlling the operation of the working unit 4 and the machine base 2 are installed on the support frames 5b and 5c, and the body is controlled at the front end of the machine body 2 in front of the seat 5a and across the boarding space 5K. A steering lever 5S for controlling the steering operation is set upright, and a front steering unit 5d on which a foot pedal 5F for controlling the operation of an attachment working machine (not shown) is installed beside the base. FIG. 1 shows a power shovel, and FIG. 2 shows a blade working machine.
Has a similar configuration.
【０００７】上記作業部４は在来のものと同様な構成に
より、図３に示す如く基部を取付ブラケット３の取付部
３ａに支軸４０を介して枢支されるブーム４１の先端に
アーム４２を支軸４３を介して枢支し（図１）、このア
ーム４２の先端にバケット４５をバケットリンク４６を
介して枢支するとともに、これらにそれぞれブームシリ
ンダ４７、アームシリンダ４８、バケットシリンダ４９
を設けて各作業を行なうようにしている。The working part 4 has the same construction as that of the conventional one, and has an arm 42 at the tip of a boom 41 pivotally supported by a mounting part 3a of a mounting bracket 3 via a supporting shaft 40 as shown in FIG. Is pivoted via a support shaft 43 (FIG. 1), and a bucket 45 is pivotally supported at the tip of the arm 42 via a bucket link 46. The bucket 45 is connected to a boom cylinder 47, an arm cylinder 48, and a bucket cylinder 49, respectively.
Is provided to perform each operation.
【０００８】また、上記各シリンダ４７，４８，４９の
油圧ホース４７ａ，４８ａ，４９ａは、以下に記す構成
によって取付ブラケット３及びボス部２０を経て機台２
に形成された開口部２Ｋ内を通り、この機台２内に設置
されて前記操作レバー５Ｌ，５Ｒで切換操作される図示
しない油圧切換バルブ（コントロールバルブ）に接続し
ている。The hydraulic hoses 47a, 48a, 49a of the cylinders 47, 48, 49 are connected to the machine base 2 via the mounting bracket 3 and the boss 20 by the following structure.
Through an opening 2K formed in the main body 2, and is connected to a hydraulic switching valve (control valve) (not shown) which is installed in the machine base 2 and operated by the operation levers 5L and 5R.
【０００９】また上記取付ブラケット３は図３、図４に
示すように、鋳物製の本体の上部に前記取付部３ａを形
成し前面にブームシリンダ４７を支持する取付部３ｂを
形成し、且つ左側面に機台２側に取付けられたスイング
シリンダ４５を支持する取付部３ｃを突出形成するとと
もに、後面に逆コ字状の二又片に形成した取付ピン３０
挿通用のメタル部を有する取付部３１，３２を突設して
いる。そして本体の内部には、上下の通孔３３ａ，３３
ｂ（図３）を有する中空部３３を形成し、この中空部３
３内に前記油圧ホース４８ａ，４９ａを挿通させてい
る。As shown in FIGS. 3 and 4, the mounting bracket 3 has the mounting portion 3a formed on the upper part of a cast main body and the mounting portion 3b for supporting the boom cylinder 47 on the front surface. A mounting portion 3c for supporting the swing cylinder 45 mounted on the machine base 2 side is formed on the surface of the mounting portion 3c.
Attachment parts 31 and 32 having a metal part for insertion are protruded. The upper and lower through holes 33a, 33
b (FIG. 3) is formed.
The hydraulic hoses 48a and 49a are inserted through the inside of the hose.
【００１０】一方、機体２の前方側に向けて突出形成し
た機台２の先端部に設けられるボス部２０は上ボス部２
１と下ボス部２２とに離間させて分割形成するととも
に、両者間の空間部に既述の油圧ホース４７ａ，４８
ａ，４９ａ等を挿通させるようにしている。即ち、この
部分における機台２は肉厚な平板からなる上枠２ａと下
枠２ｂ及び中枠２ｃの両外縁を側枠２ｄで正面視中空箱
枠状に一体的に構成し、側面視で上枠２ａと中枠２ｂと
の間における側枠２ｃの先端部位を凹入切欠することに
より油圧ホースを挿通し、その可動を許容する開口部２
Ｋを形成している。On the other hand, a boss 20 provided at the tip of the machine base 2 protruding toward the front side of the machine body 2 is provided with an upper boss 2.
1 and the lower boss 22 so as to be separated from each other, and the above-described hydraulic hoses 47a, 48 are provided in a space between the two.
a, 49a and the like are inserted. That is, the machine base 2 in this portion is configured by integrally forming both outer edges of the upper frame 2a, the lower frame 2b, and the middle frame 2c formed of a thick flat plate into a hollow box frame shape in a front view by a side frame 2d, and a side view. An opening 2 that allows the hydraulic hose to pass therethrough by recessing and notching the distal end portion of the side frame 2c between the upper frame 2a and the middle frame 2b and allowing its movement.
K is formed.
【００１１】そして上枠２ａの先端部には前記取付ブラ
ケット３の取付部３１を載置した状態で取付ピン３０を
挿通させる円筒状のボス２１ａを固着して上ボス部２１
を形成するとともに、中枠２ｃと下枠２ｂの先端部は、
前記取付部３２を挟持状に挿入支持して取付ピン３０を
挿通させる下ボス部２２を形成している。これにより取
付ブラケット３はその取付部３１，３２をそれぞれ上ボ
ス部２１と下ボス部２２に位置決めした状態で取付ピン
３０を一連に挿通することにより機台２のボス部２０に
取付ピン３０を中心に左右方向に旋回（スイング作動）
可能に支持することができる。A cylindrical boss 21a through which the mounting pin 30 is inserted while the mounting portion 31 of the mounting bracket 3 is placed is fixed to the tip of the upper frame 2a.
And the front ends of the middle frame 2c and the lower frame 2b are
The lower boss portion 22 is formed so that the mounting portion 32 is inserted and supported in a sandwiching manner and the mounting pin 30 is inserted therethrough. Thus, the mounting bracket 3 is inserted into the boss portion 20 of the machine base 2 by inserting the mounting pin 30 in a series while the mounting portions 31 and 32 are positioned on the upper boss portion 21 and the lower boss portion 22, respectively. Turn left and right around the center (swing operation)
Can be supported as much as possible.
【００１２】また上ボス部２１と下ボス部２２間の取付
ピン３０の軸部には滑動面に形成された円筒状の回転ロ
ーラ３５を回動可能に軸装するとともに、前記開口部２
Ｋのコーナー部には油圧ホースが接当したとき滑動案内
を良好に行なうことができる滑動部材２５を両側枠２ｄ
に設けている。なお、上記取付ピン３０はその上部に固
着した固定アーム３０ａを機台２に取付ネジ３０ｂによ
って取付け固定することにより回り止めを行なってい
る。A cylindrical rotating roller 35 formed on a sliding surface is rotatably mounted on the shaft of the mounting pin 30 between the upper boss 21 and the lower boss 22, and the opening 2
A sliding member 25 capable of performing good sliding guidance when a hydraulic hose comes into contact with a corner portion of K is provided on both side frames 2d.
Is provided. The mounting pin 30 is prevented from rotating by mounting and fixing a fixed arm 30a fixed on the upper portion of the mounting pin 30 to the machine base 2 with a mounting screw 30b.
【００１３】以上のように構成した作業部支持構造は、
スイングシリンダ４５の作動によって取付ピン３０を中
心に取付ブラケット３が左右に旋回するとき、その動作
に伴って、この取付ピン３０の側方を通って配管されて
いる油圧ホース４８ａ，４９ａ・・等（油圧ホース群）
は左右方向に追動するがこの追動時において油圧ホース
群は上ボス部２１と下ボス部２２との間において小径な
取付ピン３０に接近してより旋回中心側で屈伸変曲を可
及的に少なくした状態で行なうことができるので、ホー
ス長も短くすることができるとともに開口部２Ｋに対す
る出入り作動も少なくすることができる。また油圧ホー
ス群は上記追動作動時抵抗の少ない滑動部材２５及び回
転ローラ３５によって円滑に案内されるとともに損耗等
を良好に防止されるものである。The working unit supporting structure configured as described above is
When the mounting bracket 3 pivots left and right about the mounting pin 30 by the operation of the swing cylinder 45, the hydraulic hoses 48a, 49a, etc., which are piped through the sides of the mounting pin 30, accompany the operation. (Hydraulic hose group)
Moves in the left-right direction, but at this time, the hydraulic hose group approaches the small-diameter mounting pin 30 between the upper boss portion 21 and the lower boss portion 22 to bend and extend inflection on the turning center side more. Since it can be performed in a state where it is reduced as much as possible, the length of the hose can be shortened and the operation of entering and exiting the opening 2K can be reduced. Further, the hydraulic hose group is smoothly guided by the sliding member 25 and the rotating roller 35 which have a small resistance during the follow-up operation, and the wear and the like are well prevented.
【００１４】[0014]
【発明の効果】機台の開口部から取付ブラケットを通っ
て作業部に連通された油圧ホースは、該取付ブラケット
が左右に旋回されるとき、上ボス部と下ボス部間におい
て小径な取付ピンに近接して上記取付ブラケットに追動
することができるので、油圧ホースの大きな屈折や変曲
を抑制された状態で円滑に追動することができ油圧ホー
スの損耗等を防止することができる。The hydraulic hose communicated with the working part through the mounting bracket from the opening of the machine base has a small diameter mounting pin between the upper boss and the lower boss when the mounting bracket is swiveled left and right. , It is possible to follow the mounting bracket in close proximity to the hydraulic hose, so that the hydraulic hose can smoothly follow in a state where large bending and inflection of the hydraulic hose are suppressed, and wear and the like of the hydraulic hose can be prevented.
【００１５】また油圧ホースは追動作動時において、開
口部の滑動部材及び取付ピンの回転体によって円滑に作
動することができるとともに、損耗等を良好に防止する
ことができる。In addition, the hydraulic hose can be smoothly operated by the sliding member at the opening and the rotating body of the mounting pin at the time of the follow-up operation, and the wear and the like can be prevented well.
【図１】パワーショベルの側面図である。FIG. 1 is a side view of a power shovel.
【図２】ブレード作業機に於ける図１のと同様な部分の
平面図である。FIG. 2 is a plan view of a portion similar to FIG. 1 in the blade working machine.
【図３】作業部支持構造を示す側面図である。FIG. 3 is a side view showing a working unit support structure.
【図４】図３の平面図である。FIG. 4 is a plan view of FIG. 3;
【図５】従来例を示す側面図である。FIG. 5 is a side view showing a conventional example.
１ パワーショベル ２ 機台 ３ 取付ブラケット ４ 作業部 ２０ ボス部 ２１ 上ボス
部 ２５ 滑動部材 ３０ 取付ピ
ン ３５ 回転ローラ ４７ａ，４８ａ，４９ａ 油圧ホースDESCRIPTION OF SYMBOLS 1 Power shovel 2 Machine stand 3 Mounting bracket 4 Working part 20 Boss part 21 Upper boss part 25 Sliding member 30 Mounting pin 35 Rotating roller 47a, 48a, 49a Hydraulic hose
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平４−80923（ＪＰ，Ｕ) 実開 昭62−148651（ＪＰ，Ｕ) 実開 平７−29041（ＪＰ，Ｕ) 実開 昭64−10568（ＪＰ，Ｕ) 実開 平４−26251（ＪＰ，Ｕ) 実開 平６−8458（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02F 9/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-80923 (JP, U) JP-A 62-144861 (JP, U) JP-A 7-29041 (JP, U) JP-A 64-64 10568 (JP, U) JP-A-4-26251 (JP, U) JP-A-6-8458 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) E02F 9/00
Claims (2)
を支持する取付ブラケット３を縦軸の取付ピン３０を介
して旋回可能に取付けるとともに、上記作業部４を作動
させる油圧ホースを機台２内及び取付ブラケット３内を
通し、かつ、前記ボス部２０を、上ボス部２１と下ボス
部２２とに離間させて分割形成させた油圧作業機におい
て、前記上ボス部２１と前記下ボス部２２との間におい
て、前記取付ピン３０に油圧ホース案内用の回転ローラ
３５を回転可能に軸装して成る油圧作業機の作業部支持
構造。A working unit (4) is mounted on a boss (20) of a machine base (2).
The mounting bracket 3 for supporting is attached pivotably via the mounting pin 30 of vertical axis, through the machine base 2 hydraulic hoses for operating the working portion 4 and the mounting bracket 3 a, and the boss portion 20 With the upper boss 21 and the lower boss
In a hydraulic working machine divided and formed separately from the upper boss portion 22, the upper boss portion 21 and the lower boss portion 22 are separated from each other.
A rotary roller for guiding the hydraulic hose to the mounting pin 30;
A working part support structure for a hydraulic working machine comprising a rotatable shaft 35 mounted thereon .
圧ホース挿通用の開口部２Ｋの両側内面に油圧ホース案
内用の滑動部材２５を形成して成る請求項１記載の油圧
作業機の作業部支持構造。2. An oil formed on the base side of the boss portion 20.
Hydraulic hose plan on both inner surfaces of opening 2K for inserting pressure hose
The working part support structure for a hydraulic working machine according to claim 1, wherein an inner sliding member (25) is formed .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27246196A JP3305593B2 (en) | 1996-10-15 | 1996-10-15 | Working part support structure of hydraulic working machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27246196A JP3305593B2 (en) | 1996-10-15 | 1996-10-15 | Working part support structure of hydraulic working machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10114967A JPH10114967A (en) | 1998-05-06 |
| JP3305593B2 true JP3305593B2 (en) | 2002-07-22 |
Family
ID=17514245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27246196A Expired - Fee Related JP3305593B2 (en) | 1996-10-15 | 1996-10-15 | Working part support structure of hydraulic working machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3305593B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60045471D1 (en) * | 1999-02-09 | 2011-02-17 | Yanmar Co Ltd | HYDRAULICALLY DRIVEN WORKING MACHINE |
| JP2004285702A (en) | 2003-03-24 | 2004-10-14 | Komatsu Ltd | Piping arrangement structure of swing type hydraulic shovel |
| JP4490751B2 (en) * | 2004-07-16 | 2010-06-30 | セイレイ工業株式会社 | Outrigger hydraulic cylinder |
| JP4648357B2 (en) * | 2007-05-16 | 2011-03-09 | 日立建機株式会社 | Swivel construction machine |
-
1996
- 1996-10-15 JP JP27246196A patent/JP3305593B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10114967A (en) | 1998-05-06 |
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