JPS623620A - Axial-flow impeller type flowmeter - Google Patents
Axial-flow impeller type flowmeterInfo
- Publication number
- JPS623620A JPS623620A JP14343585A JP14343585A JPS623620A JP S623620 A JPS623620 A JP S623620A JP 14343585 A JP14343585 A JP 14343585A JP 14343585 A JP14343585 A JP 14343585A JP S623620 A JPS623620 A JP S623620A
- Authority
- JP
- Japan
- Prior art keywords
- flow
- impeller
- liquid
- plate
- storage case
- 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
Landscapes
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、例えば水道メータなどに使用される軸流羽根
車式流量計に関するもので、その目的とするところは、
正流時の器差の状態を損ねることなく逆流時の器差の状
態を改善させることができ、しかも機種に合わせて逆流
時の器差を最適に開面することができ、更には、小型の
軸流羽根車式流量計にも容易に適用できる軸流羽根車式
流量計を提供することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axial impeller type flowmeter used, for example, in a water meter, and its purpose is to:
It is possible to improve the condition of instrumental error during reverse flow without impairing the condition of instrumental error during forward flow, and moreover, it is possible to optimally open the instrumental error during reverse flow according to the model, and furthermore, it is compact. An object of the present invention is to provide an axial impeller type flowmeter that can be easily applied to other axial impeller type flowmeters.
上記目的を達成するための本発明の軸流羽根車式流量計
は、羽根車収容ケースの上面と流量表示機構収容ケース
の下面との間の周部に複数のリブを所定間隔ごとに設け
たものであって、前記羽根車収容ケースと前記流量表示
機構収容ケースとを別体に構成し、これら収容ケースの
何れか一方に前記リブを一体的に設けると共に、他方に
前記リブの外面から外方に突出させる板状片を一体的に
設け、更にこの板状片を前記リブの外面に、段部を一方
側に設ける状態で、着脱可能に設けるようにしたもので
ある。To achieve the above object, the axial impeller type flowmeter of the present invention has a plurality of ribs provided at predetermined intervals on the circumference between the upper surface of the impeller housing case and the lower surface of the flow rate display mechanism housing case. The impeller housing case and the flow rate display mechanism housing case are configured separately, and the rib is integrally provided on one of these housing cases, and the rib is integrally provided on the other housing case. A plate-like piece is integrally provided to protrude toward the rib, and this plate-like piece is detachably provided on the outer surface of the rib with a stepped portion on one side.
以下、本発明を第1図〜第5図に示す一実施例に基づい
て説明する。The present invention will be described below based on an embodiment shown in FIGS. 1 to 5.
第1図には、たて型軸流羽根車式流量計が示されており
、この流量計は、中央部を仕切fileで上下2室に区
画すると共に両端部に該下室に連なる流入ロアa及び該
上室から連なる流出ロアbを設けた下ケース7と、下ケ
ース7内に配設された整流器1、及び羽根車収容ケース
2内に配設された羽根車3とを具備する。FIG. 1 shows a vertical axial flow impeller type flowmeter, which has a central part divided into two upper and lower chambers by a partition file, and an inlet lower chamber connected to the lower chamber at both ends. a and an outflow lower b extending from the upper chamber, a rectifier 1 disposed within the lower case 7, and an impeller 3 disposed within an impeller housing case 2.
整流器lは、前記下ケース7の仕切壁7Cに突設せる開
口部に円筒枠状のケース1bを係合固定し、該ケース1
bの中心部位に上方に突出するピボット軸12を備えた
ボス体ICを配置し、ケース1bとボス体ICとの間に
複数の案内羽根1a・・・(この実施例では6枚)をピ
ボット軸12を中心とする放射状に配設してなる。The rectifier l is constructed by engaging and fixing a cylindrical frame-shaped case 1b to an opening protruding from the partition wall 7C of the lower case 7.
A boss body IC having a pivot shaft 12 projecting upward is arranged at the center of the case 1b, and a plurality of guide blades 1a (six in this embodiment) are pivoted between the case 1b and the boss body IC. They are arranged radially around the axis 12.
整流器1の下面部とその直下の下ケース底壁部分7dと
の間には所定の間隔が確保されていて、流入ロアaから
下ケース7内に導入された液Aが、整流器1下に導かれ
た上で案内羽根ta・・・を通過上昇せしめられるよう
になされている。A predetermined distance is ensured between the lower surface of the rectifier 1 and the bottom wall portion 7d of the lower case directly below it, so that the liquid A introduced into the lower case 7 from the inflow lower a is guided below the rectifier 1. After being tilted, the guide vanes ta... can be passed through and raised.
整流器1の直上位には羽根車3が回転自在に設けられて
いるが、この羽根車3は、第1図に示す如く、整流器1
のケース1bの上面部に同心状に取付けられた羽根車収
容ケース2内に、その下部を前記ピボット軸12に回転
自在に支持された状態で収納されている。したがって、
整流器1下に導入され案内羽根1a・・・を通過した液
Aが引続いて羽根車3を通過して下ケース7の流出ロア
bへと流出され、この液Aの流れによって羽根車3が回
転せしめられるようになされている。An impeller 3 is rotatably provided directly above the rectifier 1, and as shown in FIG.
The impeller housing case 2 is housed in an impeller housing case 2 that is concentrically attached to the upper surface of the case 1b, with its lower portion rotatably supported by the pivot shaft 12. therefore,
The liquid A introduced under the rectifier 1 and passed through the guide vanes 1a... subsequently passes through the impeller 3 and flows out to the outflow lower b of the lower case 7, and the flow of this liquid A causes the impeller 3 to It is designed to be rotated.
さらに、羽根車収容ケース2の上方には、流量表示機構
収容ケース14が羽根車収容ケース2と別体に設けられ
ていて、この収容ケース14内に、羽根車3の上部を回
転自在に支持すると共に液Aの流量を羽根車3の回転に
変換させて表示する流量表示機構が配設されている。こ
の流量表示機構は公知のものと同様構造であるからその
詳細は省略するが、羽根車3の回転を歯車群4を介して
指針5に伝達し、この指針5の回転量を目盛板Bにて読
み取ることにより、液Aの流量を表示しうるよう構成さ
れたものである。前記目盛板6は、下ケース7の中央部
の上面に開口された窓孔に臨ませて位置されており、こ
の下ケース7の開口部に装着された上ケースlOのガラ
ス板8でカバーされている。なお、上ケース10には開
閉可能な上蓋11が取付けられていて、目盛板8及びガ
ラス板8を被覆する。Further, above the impeller housing case 2, a flow rate display mechanism housing case 14 is provided separately from the impeller housing case 2, and the upper part of the impeller 3 is rotatably supported in the housing case 14. At the same time, a flow rate display mechanism is provided that converts the flow rate of the liquid A into the rotation of the impeller 3 and displays the result. This flow rate display mechanism has the same structure as a known one, so the details are omitted, but the rotation of the impeller 3 is transmitted to the pointer 5 via the gear group 4, and the amount of rotation of the pointer 5 is transmitted to the scale plate B. It is constructed so that the flow rate of liquid A can be displayed by reading the flow rate. The scale plate 6 is located facing a window hole opened in the upper surface of the center part of the lower case 7, and is covered with a glass plate 8 of the upper case 10 attached to the opening of the lower case 7. ing. Note that an openable and closable upper lid 11 is attached to the upper case 10, and covers the scale plate 8 and the glass plate 8.
また、この実施例のものでは、前記案内羽根1a・・・
のうち適当数(この実施例では3枚)のものを、第1図
に示す如く、上下に2分割し、その上側の本体羽根部1
a’・・・を他の案内羽根1a・・・と同様にケース1
b及びボス体ICに固定すると共に、下側の態動羽根部
1a“・・・をケースtb及びボス体1cにピボット軸
12回りで所定量回動可能に支持させである。Further, in this embodiment, the guide vanes 1a...
An appropriate number of them (three in this example) are divided into upper and lower halves as shown in Fig. 1, and the upper body blade part 1 is
a'... in case 1 in the same way as the other guide vanes 1a...
b and the boss body IC, and the lower movable blades 1a'' are supported by the case tb and the boss body 1c so as to be rotatable by a predetermined amount around the pivot shaft 12.
すなわち、各回転羽根部1a”は、その上位の本体羽根
部1a’ に重合する位置(第2図位置)から該本体羽
根部la° に対して円周方向にずれた位置(例えば第
3図位置)へと回動させ得るように構成されており、一
定の回動範囲内において任意の位置に固定しうるように
なされている。したがって可動羽根部1a″・・・を第
3図に示す如く本体羽根部1a’・・・に重合しない位
置にずらせておくことによって、案内羽根1 a ・・
・によって羽根車3へと流れる液流の方向を変化させる
ことができ、これによって羽根車3のトルク(回転数)
を変化させ得て、器差調整を行いうる。That is, each rotary blade portion 1a'' is positioned circumferentially offset from the position where it overlaps the main body blade portion 1a' (the position in FIG. 2) with respect to the main body blade portion la° (for example, the position in FIG. 3). The movable blade portion 1a'' is configured so that it can be rotated to a certain position), and can be fixed at any position within a certain rotation range.Therefore, the movable blade portion 1a''... is shown in FIG. By shifting the guide blades 1a' to a position where they do not overlap with the main body blades 1a', the guide blades 1a...
・The direction of the liquid flow to the impeller 3 can be changed by changing the torque (rotation speed) of the impeller 3.
can be changed to perform instrumental adjustment.
しかして、下ケース7の流入ロアaからストレーナ13
を介して整流器1下に導入された液Aは、整流器lの案
内羽根!a・・・に沿って上昇することによって流れが
整流され、羽根車収容ケース2内の羽根車3に噴流とな
って当り、液Aの流量に対応した回転量となるよう羽根
車3を回転させる。この羽根車3の回転が歯車群4を介
して指針5を回転させ、この指針5の位置を目盛板8に
て読み取ることにより液Aの流量が計量されるのである
。Therefore, from the inflow lower a of the lower case 7 to the strainer 13
The liquid A introduced below the rectifier 1 through the guide vanes of the rectifier l! The flow is rectified by rising along the direction a..., hits the impeller 3 in the impeller storage case 2 as a jet, and rotates the impeller 3 so that the amount of rotation corresponds to the flow rate of liquid A. let The rotation of the impeller 3 rotates the pointer 5 via the gear group 4, and the flow rate of the liquid A is measured by reading the position of the pointer 5 on the scale plate 8.
ところで、このような流量計にあって、前記羽根車収容
ケース2の上面周部には第4図及び第5図に示す如く複
数のリブ15・・・が所定間隔ごとに一体的に設けられ
ている。このリブ15・・・は−側面を内方先端部から
鋭角に傾斜させて正流時の器差を改善させる傾斜面15
aを形成していると共に、他側面も更に鋭角に傾斜させ
て傾斜面15bを形成している。一方、前記流量表示機
構収容ケース14の下面周部には、図示のように前記リ
ブ15・・・の外面から外方に突出させる三角板状片(
実施例)あるいは図示しないが方形、半円形等の板状片
17・・・を一体的に設けるようにしている。そして、
この板状片17・・・は、その内面を第5図に示す如く
、リブ15・・・の外面に圧入することによって着脱可
能に設けるようにしている。尚、前記板状片17・・・
をリブ15・・・の外面に設けた状態においては、その
−刃側に段部IB・・・を形成するようにしている。Incidentally, in such a flowmeter, a plurality of ribs 15 are integrally provided at predetermined intervals on the upper circumference of the impeller housing case 2, as shown in FIGS. 4 and 5. ing. This rib 15... is an inclined surface 15 whose side surface is inclined at an acute angle from the inner tip to improve instrumental error during normal flow.
a, and the other side surface is also inclined at an acute angle to form an inclined surface 15b. On the other hand, as shown in the figure, a triangular plate-shaped piece (
Embodiment) Alternatively, although not shown in the drawings, a rectangular, semicircular, etc. plate-like piece 17 is provided integrally. and,
The plate-shaped pieces 17 are removably provided by press-fitting their inner surfaces into the outer surfaces of the ribs 15, as shown in FIG. In addition, the plate-like piece 17...
is provided on the outer surface of the rib 15..., a stepped portion IB... is formed on the -blade side thereof.
このような構成にすると、今、液Aが下ケース7の流入
07aから下ケース7の流出ロアbに向う正流状態のと
きには、羽根車3を通過した液Aは。With this configuration, when the liquid A is in a normal flow state from the inflow 07a of the lower case 7 to the outflow lower b of the lower case 7, the liquid A that has passed through the impeller 3 will be.
第5図に示す如く、各リブ15・・・の−側面に形成し
た傾斜面15a・・・に沿って一方向に整流されながら
下ケース7の流出ロアbへと向うこととなる。そのため
、この傾斜画工5a・・・による整流作用によフて正流
状態のときの器差を平坦化することができ計測誤差を効
果的に改善させることができる。As shown in FIG. 5, the water flows toward the outflow lower b of the lower case 7 while being rectified in one direction along the inclined surfaces 15a formed on the negative sides of each rib 15. Therefore, due to the rectification effect of the inclined painters 5a, the instrumental error in the normal flow state can be flattened, and the measurement error can be effectively improved.
一方、このように正流時の器差の改善を行うと下ケース
7の流出ロアbから下ケース7の流入口?aに向う逆流
状態のときには、却って逆流液A゛に前記傾斜面15a
に沿う方向の旋回力を与えすぎて羽根車3を必要以上に
回転させ、逆流時の器差の状態を悪化させることとなる
。しかし、この場合順亮課*褪N取徹臓庫配l■ぺ阪l
板状片17及び段部1B・・・が設けられているから、
図中上部の逆流液A′は、前記板状片17・・・に衝突
したのち段部16・・・によって矢印C方向に進むこと
となり、この矢印C方向の流れと矢印B方向の流れとが
衝突し合って渦状態となり、前記旋回力を与えすぎる逆
流液A゛の流れを抑止することができるのである。On the other hand, if the instrumental error during normal flow is improved in this way, the inflow port of the lower case 7 will be changed from the outflow lower b of the lower case 7 to the inflow port of the lower case 7. In the case of a backflow state toward a, the backflow liquid A' is on the contrary
If too much turning force is applied in the direction along the flow direction, the impeller 3 will be rotated more than necessary, which will worsen the condition of instrumental error during backflow. However, in this case, Junryo division
Since the plate-like piece 17 and the stepped portion 1B... are provided,
The backflow liquid A' in the upper part of the figure collides with the plate-shaped pieces 17 and then moves in the direction of arrow C by the steps 16, and the flow in the direction of arrow C and the flow in the direction of arrow B are separated. collide with each other to form a vortex state, and it is possible to prevent the flow of the backflow liquid A' from exerting too much swirling force.
また一方、図中下部の逆流液A°は、板状片17・・・
によって向きを変えられた矢印B°力方向流れと、矢印
B”方向の流れとが衝突し合って渦状態となり、これも
逆流液A°の旋回流れを抑止することができるのである
。従って1羽根車3には必要以上の回転力が加わらず、
逆流時の器差の状態を効果的に改善することができるの
である。On the other hand, the backflow liquid A° at the bottom of the figure is the plate-shaped piece 17...
The flow in the direction of the force of arrow B° whose direction has been changed by the direction of arrow B'' collides with the flow in the direction of arrow B'', creating a vortex state, which can also suppress the swirling flow of the backflow liquid A°.Therefore, 1 No more rotational force than necessary is applied to the impeller 3,
This makes it possible to effectively improve the state of instrumental error during backflow.
尚、上記実施例構成のたて型羽根車式流量計と従来使用
していたWIIG図に示す傾斜リブ100を有するたて
型羽根車式流量計との比較実験、つまり器差特性の比較
実験を行ってみたところ、第7図に示すグラフのような
結果を得た。これによると、従来のものでは、流量が増
大するにつれ逆流時の器差が大きくプラス側に進み、正
流時の器差との間に大きなひらきが生じたが1本発明を
適用したものでは、流量が増大しても逆流時と正流時と
の間に大きなひらきができず、逆流時及び正流時とも良
好な器差特性が得られることが確認された。In addition, a comparison experiment was conducted between the vertical impeller type flowmeter having the configuration of the above embodiment and the conventionally used vertical impeller type flowmeter having the inclined rib 100 shown in the WIIG diagram, that is, a comparison experiment of instrumental error characteristics. When I tried this, I got results like the graph shown in Figure 7. According to this, with the conventional system, as the flow rate increased, the instrumental error during reverse flow moved toward the positive side, and there was a large gap between the instrumental error during forward flow, but in the case of the system to which the present invention is applied, It was confirmed that even when the flow rate increased, there was no large gap between the reverse flow and the forward flow, and good instrumental error characteristics were obtained both during the reverse flow and the forward flow.
このように1本発明は、非常に簡単な構成でありながら
、その効果はバッグンであり、近時要求されつつある正
流及び逆流の器差の国際規格にも十分に対処できるもの
である。As described above, although the present invention has a very simple configuration, its effects are outstanding and it can fully meet the international standards for instrumental differences between forward and reverse flows that have recently been required.
しかも、本発明の構成であれば、板状片がリブの外面に
対して着脱可能であるから、板状片のリブ外面に対する
取付は位置を適宜設定することにより、逆流時の器差の
状態が異なる他の機種にも最適の器差状態に設定するこ
とができ頗る便利であると共に、スペース的に制約があ
る小型のたて型軸流羽根車式流量計にも容易に適用する
ことができる。Moreover, with the configuration of the present invention, since the plate-like piece is removable from the outer surface of the rib, the attachment of the plate-like piece to the outer surface of the rib can be done by appropriately setting the position to maintain the instrumental error during backflow. It is extremely convenient because it can be set to the optimal instrument error condition for other models with different types, and it can also be easily applied to small vertical axial flow impeller type flowmeters that have space constraints. can.
尚、本発明は、上記実施例の構成に限定されるものでは
なく1例えば第8図に示すように、リブ15が周方向に
4個配設され且つ各リブ15・・・の両側面に傾斜面が
ないものにも適用できる。このようなリブであっても、
羽根車収容ケースの構造、下ケースの構造、その他別の
部分で構造的に変化があれば、逆流時に、羽根車に回転
力を与えすぎるといラケースが生じるからである。また
、前記実施例ではリブを羽根車収容ケースに、板状片を
流量表示機構収容ケースにそれぞれ一体的に設けたが、
勿論その逆の状態でリブ及び板状片を一体的に設けるよ
うにしてもよい、何れにせよ、本発明は、リブを有する
軸流羽根車式流量計の全てに適用できるものである。It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiment. For example, as shown in FIG. 8, four ribs 15 are arranged in the circumferential direction, and on both sides of each rib It can also be applied to objects without sloped surfaces. Even with ribs like this,
This is because if there is a structural change in the structure of the impeller housing case, the structure of the lower case, or any other part, a case may occur if too much rotational force is applied to the impeller during backflow. Furthermore, in the above embodiment, the rib was integrally provided in the impeller housing case, and the plate-like piece was integrally provided in the flow rate display mechanism housing case, but
Of course, the ribs and the plate-shaped piece may be provided integrally in the reverse state, but in any case, the present invention is applicable to all axial flow impeller type flowmeters having ribs.
第1図ないし第4図は本発明の一実施例を示し第1図は
たて型軸流羽根車式流量計の縦断面図第2図は整流器の
底面図、第3図は同整流器の器差調整を行う状態を示し
た底面図、第4図は羽根車収容ケースと流量表示機構収
容ケースとを示す正面図、第5図は第1図のv−v線に
沿う要部断面図、第6図は従来のリブを示す前記第5図
相当の要部断面図、第7図は本発明を適用したものと従
来のものとの比較試験結果を測定数値および線図で示し
たもの、第8図は本発明の他の実施例を示す前記第5図
相当の要部断面図である。
2・・・羽根車収容ケース
14・・・流量表示機構収容ケース
15・・・リブ
1B・・・段部
17・・・板状片
特許出願人 東光精機株式会社
代 理 人 弁理士 鈴江 孝−第4図
第8図
手続補正書く旗)
昭和60年10月11日
特許庁長官 学賞 退部 殿
2、発明の名称
軸流羽根車式流量計
3、補正をする者
事件との関係 特許出願人
東光精機株式会社
4、代理人Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a vertical cross-sectional view of a vertical axial impeller flowmeter. Figure 2 is a bottom view of a rectifier. Figure 3 is a bottom view of the rectifier. FIG. 4 is a front view showing the impeller storage case and the flow rate display mechanism storage case, and FIG. 5 is a sectional view of the main parts along the v-v line in FIG. 1. , Fig. 6 is a sectional view of the main part corresponding to Fig. 5 showing a conventional rib, and Fig. 7 shows the results of a comparative test between the rib to which the present invention is applied and the conventional rib, using measured values and a diagram. , FIG. 8 is a sectional view of a main part corresponding to FIG. 5, showing another embodiment of the present invention. 2... Impeller housing case 14... Flow rate display mechanism housing case 15... Rib 1B... Step portion 17... Plate-shaped piece Patent applicant Toko Seiki Co., Ltd. Agent Patent attorney Takashi Suzue Figure 4 (Figure 8) Flag for writing amendments to procedures) October 11, 1985 Commissioner of the Japan Patent Office Academic Award Resignation Mr. 2 Name of the invention Axial flow impeller type flow meter 3 Person making the amendment Relationship to the case Patent applicant Toko Seiki Co., Ltd. 4, Agent
Claims (1)
面との間の周部に複数のリブを所定間隔ごとに設けた軸
流羽根車式流量計において、前記羽根車収容ケースと前
記流量表示機構収容ケースとを別体に構成して、これら
収容ケースの何れか一方に前記リブを一体的に設けると
共に、他方に前記リブの外面から外方に突出させる板状
片を一体的に設け、更にこの板状片を前記リブの外面に
、段部を一方側に設ける状態で、着脱可能に設けるよう
にしたことを特徴とする軸流羽根車式流量計。In an axial impeller type flowmeter in which a plurality of ribs are provided at predetermined intervals on the circumference between the upper surface of the impeller storage case and the lower surface of the flow rate display mechanism storage case, the impeller storage case and the flow rate display mechanism are provided. The storage case is configured separately, one of these storage cases is integrally provided with the rib, and the other is integrally provided with a plate-like piece that projects outward from the outer surface of the rib, and An axial impeller type flowmeter characterized in that the plate-like piece is removably provided on the outer surface of the rib with a stepped portion on one side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14343585A JPS623620A (en) | 1985-06-29 | 1985-06-29 | Axial-flow impeller type flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14343585A JPS623620A (en) | 1985-06-29 | 1985-06-29 | Axial-flow impeller type flowmeter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS623620A true JPS623620A (en) | 1987-01-09 |
JPH0323849B2 JPH0323849B2 (en) | 1991-03-29 |
Family
ID=15338641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14343585A Granted JPS623620A (en) | 1985-06-29 | 1985-06-29 | Axial-flow impeller type flowmeter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS623620A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6351222U (en) * | 1986-09-22 | 1988-04-06 | ||
JP2005227230A (en) * | 2004-02-16 | 2005-08-25 | Ricoh Elemex Corp | Flowmeter |
JP2010066061A (en) * | 2008-09-09 | 2010-03-25 | Toyo Keiki Co Ltd | Flow rate meter case and flow rate meter |
-
1985
- 1985-06-29 JP JP14343585A patent/JPS623620A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6351222U (en) * | 1986-09-22 | 1988-04-06 | ||
JP2005227230A (en) * | 2004-02-16 | 2005-08-25 | Ricoh Elemex Corp | Flowmeter |
JP2010066061A (en) * | 2008-09-09 | 2010-03-25 | Toyo Keiki Co Ltd | Flow rate meter case and flow rate meter |
Also Published As
Publication number | Publication date |
---|---|
JPH0323849B2 (en) | 1991-03-29 |
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