JP2509542Y2 - Electrostatic coating equipment - Google Patents
Electrostatic coating equipmentInfo
- Publication number
- JP2509542Y2 JP2509542Y2 JP3411791U JP3411791U JP2509542Y2 JP 2509542 Y2 JP2509542 Y2 JP 2509542Y2 JP 3411791 U JP3411791 U JP 3411791U JP 3411791 U JP3411791 U JP 3411791U JP 2509542 Y2 JP2509542 Y2 JP 2509542Y2
- Authority
- JP
- Japan
- Prior art keywords
- path
- switching valve
- paint
- valve
- storage tank
- 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
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- Electrostatic Spraying Apparatus (AREA)
Description
【0001】[0001]
【産業上の利用分野】本考案は、導電性塗料に高電圧を
直接印加して静電塗装を行う内部印加型静電塗装装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal application type electrostatic coating device for performing electrostatic coating by directly applying a high voltage to a conductive coating.
【0002】[0002]
【従来の技術】従来から、導電性塗料に高電圧を直接印
加して被塗装物に静電塗装を施す技術として、例えば米
国特許第4,771,729号に開示されているものが
知られている。2. Description of the Related Art Conventionally, as a technique for applying a high voltage directly to a conductive coating to electrostatically coat an object to be coated, one disclosed in US Pat. No. 4,771,729 is known. ing.
【0003】この従来技術では、導電性塗料が、塗料供
給源から供給経路を介して中間貯留槽に一旦導入された
後、この供給経路が洗浄および乾燥されて電気的絶縁状
態(電圧ブロック)が構成されることにより前記塗料供
給源側に電流がリークすることを阻止した状態で、高電
圧が直接印加された塗料を、前記中間貯留槽から塗装ガ
ンに供給して被塗装物に対する静電塗装作業が行われて
いる。In this conventional technique, the conductive paint is once introduced into the intermediate storage tank from the paint supply source through the supply path, and then this supply path is washed and dried to bring the electrically insulated state (voltage block) into consideration. With the construction configured to prevent the current from leaking to the paint supply side, the paint to which a high voltage is directly applied is supplied from the intermediate storage tank to the coating gun to electrostatically coat the object to be coated. Work is being done.
【0004】[0004]
【考案が解決しようとする課題】ところが、この種の内
部印加型の静電塗装装置では、塗料や装置自体、特に中
間貯留槽に相当に多くの電荷が残留するため、塗装ガン
がワーク等の導電体に異常に接近した場合、たとえ高電
圧の印加を停止してもこの残留電荷によってスパークが
発生し、塗装不良等の原因となるという問題が指摘され
ている。However, in this type of internal application type electrostatic coating apparatus, a considerable amount of electric charge remains in the coating material and the apparatus itself, especially in the intermediate storage tank. It has been pointed out that when the conductor is abnormally close to the conductor, sparks are generated due to the residual charges even if the application of the high voltage is stopped, which causes a coating failure or the like.
【0005】本考案は、この種の問題を解決するもので
あり、装置内の残留電荷を迅速にかつ確実に放出させる
ことができ、これにより異常時においてもスパークの発
生を防止するとともに、効率的な静電塗装作業を遂行可
能な静電塗装装置を提供することを目的とする。The present invention solves this type of problem and allows the residual charge in the device to be discharged quickly and reliably, thereby preventing the occurrence of sparks in the event of abnormal conditions and improving efficiency. An object of the present invention is to provide an electrostatic coating device capable of performing a typical electrostatic coating operation.
【0006】[0006]
【課題を解決するための手段】前記の目的を達成するた
めに、本考案は、接地された塗料供給源と、前記塗料供
給源から貯留槽に導電性塗料を供給するとともに、少な
くとも一部に電気的絶縁経路が設けられた供給経路と、
前記絶縁経路を洗浄、乾燥させて前記塗料供給源と貯留
槽とを電気的に絶縁する手段と、前記絶縁経路の貯留槽
側端部に設けられ、少なくとも前記絶縁経路と貯留槽と
を開閉自在な導電材料製切換弁と、前記切換弁に接続さ
れる接地された高抵抗体とを備えることを特徴とする。In order to achieve the above-mentioned object, the present invention provides a grounded paint supply source and a conductive paint from the paint supply source to a storage tank, and at least a part thereof. A supply path provided with an electrically insulating path,
Means for electrically insulating the paint supply source and the storage tank by washing and drying the insulation path, and provided at the end of the insulation path on the storage tank side, at least the insulation path and the storage tank can be opened and closed. And a grounded high resistance body connected to the switching valve.
【0007】[0007]
【作用】上記の本考案に係る静電塗装装置では、塗料供
給源から供給経路を介して貯留槽に導電性塗料が一旦貯
留された後、この供給経路の一部に設けられた絶縁経路
が洗浄、乾燥されて前記塗料供給源と貯留槽とが電気的
に絶縁された状態で、この貯留槽から導出される塗料に
高電圧が直接印加されて静電塗装作業が行われる。そし
て、貯留槽に残留する電荷は、切換弁に接続された高抵
抗体を介して接地側に迅速にかつ確実に放出される。In the electrostatic coating apparatus according to the present invention described above, after the conductive paint is once stored in the storage tank from the paint supply source via the supply path, the insulating path provided in a part of this supply path is In a state where the paint supply source and the storage tank are electrically insulated after being washed and dried, a high voltage is directly applied to the paint drawn from the storage tank to perform electrostatic coating work. Then, the electric charge remaining in the storage tank is quickly and surely discharged to the ground side through the high resistance body connected to the switching valve.
【0008】[0008]
【実施例】本考案に係る静電塗装装置について実施例を
挙げ、添付の図面を参照して以下に説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electrostatic coating apparatus according to the present invention.
【0009】図1において、参照符号10は、本実施例
に係る静電塗装装置を示す。この静電塗装装置10は、
接地された色替弁機構12と、この色替弁機構12から
供給経路13を介して供給される導電性を有する水性塗
料を一旦貯留する中間貯留部14と、この中間貯留部1
4に供給経路16を介して接続された四方切換弁18
と、この四方切換弁18の出口側に送出経路20を介し
て接続された塗装ガン22とを備える。In FIG. 1, reference numeral 10 indicates an electrostatic coating apparatus according to this embodiment. This electrostatic coating device 10
The grounded color change valve mechanism 12, an intermediate storage section 14 that temporarily stores the conductive water-based paint supplied from the color change valve mechanism 12 through the supply path 13, and the intermediate storage section 1
Four-way switching valve 18 connected to the No. 4 via the supply path 16
And a coating gun 22 connected to the outlet side of the four-way switching valve 18 via a delivery path 20.
【0010】色替弁機構12は、エア(A)、水(W)
および洗浄液(S)等の供給を制御する洗浄弁24と、
異なる色の水性塗料を供給することが可能な複数の塗料
弁26a乃至26cとを備えている。この色替弁機構1
2の出口側に接続された中間貯留部14は、水性塗料が
一旦貯留される貯留槽28と、互いに所定の距離を確保
して離間するとともに、この貯留槽28に沿って配置さ
れる一組の導電材料製三方切換弁(切換弁)30a、3
0bおよび所定の高電圧を絶縁可能な長さを有し供給経
路13の一部を構成する絶縁経路32が設けられたブロ
ック弁機構34とを備える(図2参照)。The color change valve mechanism 12 includes air (A) and water (W).
And a cleaning valve 24 for controlling the supply of cleaning liquid (S) and the like,
It is provided with a plurality of paint valves 26a to 26c capable of supplying water-based paints of different colors. This color change valve mechanism 1
The intermediate storage section 14 connected to the outlet side of 2 is separated from the storage tank 28 in which the water-based paint is temporarily stored by ensuring a predetermined distance from each other and arranged along the storage tank 28. 3-way switching valve (switching valve) 30a, 3 made of conductive material
0b and a block valve mechanism 34 provided with an insulating path 32 having a length capable of insulating a predetermined high voltage and forming a part of the supply path 13 (see FIG. 2).
【0011】この三方切換弁30aの入口側に、色替弁
機構12と、接地された第1洗浄弁機構36とが接続さ
れており、この第1洗浄弁機構36は、少なくとも絶縁
経路32を水(W)および洗浄液(S)等で洗浄する手
段である洗浄弁38と、この絶縁経路32を乾燥する手
段であるエア供給弁40とを備える。三方切換弁30b
の出口側には、排出経路42を介して廃液槽44が接続
されており、この三方切換弁30bと三方切換弁30a
とに、高抵抗体(例えば、5GΩ程度)Rが配置され
る。この高抵抗体Rを介して三方切換弁30a、30b
が電気的に接続されるとともに、この三方切換弁30a
が、色替弁機構12を介して接地されている。A color change valve mechanism 12 and a grounded first cleaning valve mechanism 36 are connected to the inlet side of the three-way switching valve 30a, and the first cleaning valve mechanism 36 has at least the insulating path 32. A cleaning valve 38, which is a means for cleaning with water (W) and a cleaning liquid (S), and an air supply valve 40, which is a means for drying the insulating path 32, are provided. Three-way switching valve 30b
A waste liquid tank 44 is connected to the outlet side of the three-way switching valve 30b and the three-way switching valve 30a via a discharge path 42.
A high resistance element (for example, about 5 GΩ) R is arranged at the position. The three-way switching valves 30a, 30b are connected via the high resistance body R.
Is electrically connected and the three-way switching valve 30a
Is grounded via the color change valve mechanism 12.
【0012】貯留槽28は、ピストン46を介して分割
される塗料および洗浄液等の注入用第1シリンダ室48
と、エア供給用第2シリンダ室50とを備え、この第2
シリンダ室50に、空気供給源52が流量調整弁54、
開閉弁56を介して連通する。この空気供給源52は、
ブースタ58を経由してエア圧を調節するための塗料の
流量調節器60に接続され、この流量調節器60により
塗料の吐出量の制御が図られる。The storage tank 28 is provided with a first cylinder chamber 48 for injecting paint, cleaning liquid, etc., which is divided via a piston 46.
And a second cylinder chamber 50 for air supply.
In the cylinder chamber 50, an air supply source 52 is provided with a flow rate adjusting valve 54,
It communicates via the on-off valve 56. This air supply source 52 is
It is connected to a paint flow rate controller 60 for adjusting the air pressure via the booster 58, and the flow rate controller 60 controls the discharge amount of the paint.
【0013】貯留槽28の第1シリンダ室48には、供
給経路16を介して四方切換弁18が接続され、この四
方切換弁18が送出経路20を介して流量調節器60と
塗装ガン22とに接続される。この四方切換弁18の入
口側に、洗浄弁62とエア供給弁64とを備えた第2洗
浄弁機構66が接続され、この第2洗浄弁機構66は、
送出経路20と、排出経路68を介して廃液槽70とに
接続自在である。A four-way switching valve 18 is connected to the first cylinder chamber 48 of the storage tank 28 via a supply path 16, and the four-way switching valve 18 is connected to a flow rate controller 60 and a coating gun 22 via a delivery path 20. Connected to. A second cleaning valve mechanism 66 including a cleaning valve 62 and an air supply valve 64 is connected to the inlet side of the four-way switching valve 18, and the second cleaning valve mechanism 66 includes
It is connectable to the waste passage 70 via the delivery passage 20 and the discharge passage 68.
【0014】塗装ガン22は、ダンプ弁72とトリガ弁
74と高電圧印加手段75とを備えており、このダンプ
弁72には、排出経路76を介して廃液槽70が接続さ
れるとともに、この排出経路76の途上に、洗浄弁78
とエア供給弁80とを設けた第3洗浄弁機構82が接続
される。The coating gun 22 includes a dump valve 72, a trigger valve 74 and a high voltage applying means 75. The dump valve 72 is connected to a waste liquid tank 70 via a discharge path 76, A washing valve 78 is provided on the way of the discharge path 76.
And a third cleaning valve mechanism 82 provided with an air supply valve 80 are connected.
【0015】次に、このように構成される静電塗装装置
10の動作について説明する。Next, the operation of the electrostatic coating device 10 thus constructed will be described.
【0016】まず色替弁機構12の塗料弁26aから導
出された所定の色の塗料が、中間貯留部14のブロック
弁機構34に供給されると、この塗料は、三方切換弁3
0a、絶縁経路32および三方切換弁30bを通って貯
留槽28の第1シリンダ室48に充填される。この第1
シリンダ室48に充填された塗料は、供給経路16、四
方切換弁18および送出経路20を経由して塗装ガン2
2まで充填される。この充填時には、トリガ弁74は閉
塞される一方、ダンプ弁72は開放され、充填後に前記
ダンプ弁72が閉成される。First, when the paint of a predetermined color derived from the paint valve 26a of the color changing valve mechanism 12 is supplied to the block valve mechanism 34 of the intermediate storage section 14, this paint is applied to the three-way switching valve 3
0a, the insulating path 32, and the three-way switching valve 30b to fill the first cylinder chamber 48 of the storage tank 28. This first
The paint with which the cylinder chamber 48 is filled passes through the supply path 16, the four-way switching valve 18 and the delivery path 20, and the coating gun 2
Fill up to 2. During this filling, the trigger valve 74 is closed, while the dump valve 72 is opened, and after the filling, the dump valve 72 is closed.
【0017】そこで、ブロック弁機構34を構成する三
方切換弁30a、30bの切換動作が行われ、第1洗浄
弁機構36が絶縁経路32の一端側に連通するととも
に、この絶縁経路32の他端側が排出経路42を介して
廃液槽44に連通する。この状態で、第1洗浄弁機構3
6を構成する洗浄弁38の駆動作用下に洗浄液が、三方
切換弁30a、絶縁経路32および三方切換弁30bを
洗浄して排出経路42から廃液槽44に排出される。Then, the switching operation of the three-way switching valves 30a and 30b constituting the block valve mechanism 34 is performed, the first cleaning valve mechanism 36 communicates with one end side of the insulating path 32, and the other end of the insulating path 32. The side communicates with the waste liquid tank 44 via the discharge path 42. In this state, the first cleaning valve mechanism 3
The cleaning liquid under the driving action of the cleaning valve 38 constituting 6 cleans the three-way switching valve 30 a, the insulating path 32 and the three-way switching valve 30 b, and is discharged from the discharge path 42 to the waste liquid tank 44.
【0018】前記洗浄終了後に、第1洗浄弁機構36を
構成するエア供給弁40からドライエアが供給され、こ
のドライエアによって少なくとも絶縁経路32内が乾燥
されて、色替弁機構12と貯留槽28とが、電気的に絶
縁される。次いで、空気供給源52から流量調整弁54
および開閉弁56を介して貯留槽28の第2シリンダ室
50に駆動用エアが供給され、ピストン46が第1シリ
ンダ室48側に変位して、塗料は、高電圧印加手段75
の作用下に高電圧が直接印加された状態でトリガ弁74
の開成作用下に図示しないワークに供給される。After the cleaning is completed, dry air is supplied from the air supply valve 40 constituting the first cleaning valve mechanism 36, and at least the inside of the insulating path 32 is dried by this dry air, so that the color change valve mechanism 12 and the storage tank 28 are connected. Are electrically isolated. Next, from the air supply source 52 to the flow rate adjustment valve 54
Driving air is supplied to the second cylinder chamber 50 of the storage tank 28 via the open / close valve 56, the piston 46 is displaced to the first cylinder chamber 48 side, and the paint is applied to the high voltage applying means 75.
Under the action of high voltage is directly applied to the trigger valve 74
Is supplied to the work (not shown) under the opening action.
【0019】次に、高電圧印加手段75の駆動が停止さ
れ、上述したように貯留槽28への塗料の供給作業が遂
行されるものであるが、この高電圧印加停止時に、特に
貯留槽28に相当量の電荷が残留している場合が多い。
ここで、本実施例では、絶縁経路32の貯留槽28側の
端部に導電材料製三方切換弁30bが設けられるととも
に、この三方切換弁30bと三方切換弁30aとに高抵
抗体Rが配置されている。従って、貯留槽28に残留す
る電荷は、三方切換弁30b、高抵抗体Rおよび三方切
換弁30aを介して接地側に迅速にかつ確実に放出さ
れ、従来の静電塗装装置に比べて相当短時間に残留電荷
の放出作業が遂行される。これによって、塗料への高電
圧印加を停止した直後に塗装ガン22がワーク等の導電
体に異常に接近しても、スパーク等の発生を有効に阻止
することができ、塗装不良を惹起することがなく効率的
かつ高精度な静電塗装作業が遂行されるという効果が得
られる。しかも、高抵抗体Rが、例えば5GΩ程度に選
択されるため、静電塗装を行うべく塗料に高電圧が印加
される際に、この高抵抗体Rから必要以上に漏電するこ
とを防止でき、塗装不良を招来することがない。Next, the driving of the high voltage applying means 75 is stopped, and the work of supplying the coating material to the storage tank 28 is performed as described above. In many cases, a considerable amount of electric charge remains.
Here, in this embodiment, a three-way switching valve 30b made of a conductive material is provided at the end of the insulating path 32 on the storage tank 28 side, and the high resistance body R is arranged in the three-way switching valve 30b and the three-way switching valve 30a. Has been done. Therefore, the electric charge remaining in the storage tank 28 is rapidly and surely discharged to the ground side through the three-way switching valve 30b, the high resistance element R and the three-way switching valve 30a, which is considerably shorter than that of the conventional electrostatic coating device. In time, the work of discharging the residual charge is performed. As a result, even if the coating gun 22 abnormally approaches a conductor such as a work immediately after the application of high voltage to the coating material is stopped, it is possible to effectively prevent the occurrence of sparks and the like, and cause coating failure. It is possible to obtain an effect that an efficient and highly accurate electrostatic coating work can be performed without any problem. Moreover, since the high resistance R is selected to be, for example, about 5 GΩ, it is possible to prevent the high resistance R from leaking more than necessary when a high voltage is applied to the paint for electrostatic coating. No paint defects will occur.
【0020】さらに、図2に示すように高抵抗体Rは、
絶縁経路32と平行してコンパクトに配置されており、
中間貯留部14全体が大型化することを阻止することが
可能である。Further, as shown in FIG. 2, the high resistance element R is
Compactly arranged in parallel with the insulation path 32,
It is possible to prevent the entire intermediate storage unit 14 from increasing in size.
【0021】なお、本実施例では、三方切換弁30aと
30bとの間に高抵抗体Rが配置されているが、少なく
とも絶縁経路32の貯留槽28側、すなわち三方切換弁
30bを導電材料製で形成してこの三方切換弁30bの
みに接地された高抵抗体Rが接続されるように構成して
もよい。また、複数の二方切換弁を備える場合には、貯
留槽側に近接配置されている二方切換弁に接地された高
抵抗体を設ければよい。In this embodiment, the high resistance element R is arranged between the three-way switching valves 30a and 30b, but at least the storage tank 28 side of the insulating path 32, that is, the three-way switching valve 30b is made of a conductive material. The three-way switching valve 30b may be connected to the grounded high resistance element R. When a plurality of two-way switching valves are provided, a two-way switching valve disposed close to the storage tank may be provided with a grounded high resistance body.
【0022】[0022]
【考案の効果】本考案に係る静電塗装装置によれば、以
下の効果が得られる。According to the electrostatic coating device of the present invention, the following effects can be obtained.
【0023】貯留槽に残留する電荷が、この貯留槽に近
接配置される切換弁に接続された高抵抗体を介して接地
側に迅速にかつ確実に放出されるため、塗装ガン等にワ
ーク等の導電部材が異常接近しても、この貯留槽の残留
電荷によりスパーク発生等の不都合を生ずることがな
く、塗装不良を回避して高精度なかつ効率的な塗装作業
を遂行することが可能になる。Since the electric charge remaining in the storage tank is quickly and surely discharged to the ground side through the high resistance element connected to the switching valve arranged in the vicinity of the storage tank, the work such as a coating gun can be discharged. Even if the conductive member is abnormally approached, the residual charge in the storage tank does not cause inconvenience such as spark generation, and it is possible to avoid defective coating and perform highly accurate and efficient coating work. .
【図1】本実施例に係る静電塗装装置の概略説明図であ
る。FIG. 1 is a schematic explanatory view of an electrostatic coating apparatus according to this embodiment.
【図2】前記静電塗装装置の要部拡大説明図である。FIG. 2 is an enlarged explanatory view of a main part of the electrostatic coating device.
10…静電塗装装置 12…色替弁機構 13…供給経路 14…中間貯留部 16…供給経路 18…四方切換弁 20…送出経路 22…塗装ガン 28…貯留槽 30a、30b…三方切換弁 32…絶縁経路 34…ブロック弁機構 36、66、82…洗浄弁機構 R…高抵抗体 DESCRIPTION OF SYMBOLS 10 ... Electrostatic coating device 12 ... Color change valve mechanism 13 ... Supply path 14 ... Intermediate storage part 16 ... Supply path 18 ... Four-way switching valve 20 ... Delivery path 22 ... Painting gun 28 ... Storage tanks 30a, 30b ... Three-way switching valve 32 ... Insulation path 34 ... Block valve mechanism 36, 66, 82 ... Washing valve mechanism R ... High resistance body
───────────────────────────────────────────────────── フロントページの続き (72)考案者 石橋 一郎 埼玉県狭山市新狭山1−10−1 ホンダ エンジニアリング株式会社内 (56)参考文献 特開 平2−2885(JP,A) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ichiro Ishibashi 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) Reference JP-A-2-2885 (JP, A)
Claims (2)
から貯留槽に導電性塗料を供給するとともに、少なくと
も一部に電気的絶縁経路が設けられた供給経路と、前記
絶縁経路を洗浄、乾燥させて前記塗料供給源と貯留槽と
を電気的に絶縁する手段と、前記絶縁経路の貯留槽側端
部に設けられ、少なくとも前記絶縁経路と貯留槽とを開
閉自在な導電材料製切換弁と、前記切換弁に接続される
接地された高抵抗体とを備えることを特徴とする静電塗
装装置。1. A grounded paint supply source, a supply path in which a conductive paint is supplied from the paint supply source to a storage tank, and at least a part of which is provided with an electrical insulation path, and the insulation path is cleaned. A means for electrically insulating the paint supply source and the storage tank by drying, and a conductive material switch provided at an end portion of the insulation path on the storage tank side and capable of opening and closing at least the insulation path and the storage tank An electrostatic coating device comprising a valve and a grounded high resistance body connected to the switching valve.
貯留槽側端部に設けられる切換弁は、前記絶縁経路を供
給経路と塗料等の排出経路とに選択的に連通させる導電
材料製三方切換弁であり、前記絶縁経路の塗料供給源側
端部には、前記絶縁経路を塗料供給源と洗浄弁とに選択
的に連通させる導電材料製三方切換弁が設けられるとと
もに、高抵抗体の接地部が、前記絶縁経路の塗料供給源
側端部に設けられた三方切換弁であることを特徴とする
静電塗装装置。2. The device according to claim 1, wherein the switching valve provided at the end of the insulating path on the reservoir side is made of a conductive material for selectively communicating the insulating path with the supply path and the discharge path of paint or the like. A three-way switching valve, which is provided with a conductive material three-way switching valve for selectively communicating the insulating path with the paint supply source and the cleaning valve, is provided at the end of the insulating path on the paint supply source side. The electrostatic coating device is characterized in that the grounding part is a three-way switching valve provided at the end of the insulating path on the paint supply source side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3411791U JP2509542Y2 (en) | 1991-05-15 | 1991-05-15 | Electrostatic coating equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3411791U JP2509542Y2 (en) | 1991-05-15 | 1991-05-15 | Electrostatic coating equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04131452U JPH04131452U (en) | 1992-12-03 |
JP2509542Y2 true JP2509542Y2 (en) | 1996-09-04 |
Family
ID=31916602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3411791U Expired - Lifetime JP2509542Y2 (en) | 1991-05-15 | 1991-05-15 | Electrostatic coating equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2509542Y2 (en) |
-
1991
- 1991-05-15 JP JP3411791U patent/JP2509542Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04131452U (en) | 1992-12-03 |
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