JP2538052Y2 - Ground improvement equipment - Google Patents
Ground improvement equipmentInfo
- Publication number
- JP2538052Y2 JP2538052Y2 JP3878293U JP3878293U JP2538052Y2 JP 2538052 Y2 JP2538052 Y2 JP 2538052Y2 JP 3878293 U JP3878293 U JP 3878293U JP 3878293 U JP3878293 U JP 3878293U JP 2538052 Y2 JP2538052 Y2 JP 2538052Y2
- Authority
- JP
- Japan
- Prior art keywords
- bit
- prevention plate
- rotation
- rotation prevention
- stirring blade
- 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
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は地盤改良装置に係り、特
に基礎工事等において掘削土と充填剤を混合して地盤を
改良する地盤改良装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil improvement device, and more particularly to a soil improvement device for improving ground by mixing excavated soil and a filler in foundation work or the like.
【０００２】[0002]
【従来の技術】従来の地盤改良装置は特公昭５８−２９
３７４号公報に示すように、掘削軸の下端部に掘削用の
ビットを備えていて、ビットの上方の掘削軸には攪拌翼
が複数段状に取り付けられていて、ビットと攪拌翼間の
掘削軸や攪拌翼と攪拌翼間の掘削軸には共回り防止板が
回動自在に支持されている。この共回り防止板はビット
径や攪拌翼径より長く設定されている。このように構成
された地盤改良装置で地盤を改良する場合、掘削軸を回
転してビットで地盤に円形の孔を掘削し、同時に掘削軸
からセメントミルク等の充填剤を供給して掘削する。ビ
ットで掘削された掘削土は充填剤と混り合いながら、粘
性と付着があるのでビットや攪拌翼の動きと一緒に共回
りする。2. Description of the Related Art A conventional ground improvement device is disclosed in Japanese Patent Publication No. 58-29.
As shown in Japanese Patent Publication No. 374, a drilling bit is provided at the lower end of a drilling shaft, and a plurality of stirring blades are mounted on the drilling shaft above the bit. A co-rotation prevention plate is rotatably supported on the shaft and the excavation shaft between the stirring blades. The co-rotation prevention plate is set longer than the bit diameter and the stirring blade diameter. If improving soil In the thus constructed soil improvement device, by rotating the excavating shaft drilling circular hole in the ground by bit, to drill by supplying a filler such as cement mill click from simultaneously excavating shaft . The excavated soil excavated with the bit mixes with the filler and has viscosity and adhesion, so that it co-rotates with the movement of the bit and the stirring blade.
【０００３】一方、共回り防止板はビットや攪拌翼より
長く形成されているので、共回り防止板の両端部が掘削
孔の外側の地盤に貫入する。従って、共回り防止板の両
端部は掘削孔の外側地盤の抵抗を受けるので、共回り防
止板は回転せずに掘削孔内に貫入する。これにより、回
転翼等と共回りしている掘削土や充填剤は共回り防止板
でせき止められて共回りが静止され、静止した掘削土や
充填剤は回転中のビットや攪拌翼で剪断粉砕されるの
で、掘削土や充填剤が攪拌、混合されて地盤が改良され
る。On the other hand, since the co-rotation prevention plate is formed longer than the bit and the stirring blade, both ends of the co-rotation prevention plate penetrate into the ground outside the excavation hole. Therefore, since both ends of the anti-corotating plate receive the resistance of the ground outside the excavation hole, the anti-corotating plate penetrates into the excavation hole without rotating. As a result, the excavated soil and filler co-rotating with the rotary wings and the like are stopped by the anti-rotation plate and the co-rotation is stopped, and the stationary excavated soil and filler are sheared and crushed by the rotating bit or stirring blade. As a result, the excavated soil and filler are stirred and mixed to improve the ground.
【０００４】[0004]
【考案が解決しようとする課題】しかしながら、従来の
地盤改良装置は共回り防止板の回転を阻止するために、
共回り防止板の両端部を掘削孔の外側の地盤に貫入させ
る必要があるので、掘削孔の壁面を崩すおそれがあり、
また、礫が当接した場合障害となって共回り防止板が地
盤に貫入できなくなるという欠点がある。また、地盤改
良は隣孔とラップして掘削するため、掘削径より大きい
共回り防止板では既にセメントミルクで固結している隣
孔に貫入しないという欠点がある。[Problems to be Solved by the Invention] However, the conventional ground improvement device prevents rotation of the co-rotation prevention plate.
Since it is necessary to penetrate both ends of the co-rotation prevention plate into the ground outside the drill hole, there is a possibility that the wall surface of the drill hole may be broken,
In addition, there is a drawback that the co-rotation prevention plate cannot penetrate the ground when the gravel comes into contact. Further, soil improvement is for drilling in Tonariana and the lap, the disadvantage that the drilling diameter is larger than both about preventing plate not penetrate the Tonariana that already consolidated with cement mill click.
【０００５】本考案はこのような事情に鑑みてなされた
もので、掘削孔の外側の地盤に貫入させずに共回り防止
板の回動を阻止することができる地盤改良装置を提供す
ることを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ground improvement device which can prevent the rotation of the co-rotation preventing plate without penetrating the ground outside the excavation hole. Aim.
【０００６】[0006]
【課題を解決する為の手段】本考案は、前記目的を達成
する為に、ビット及び攪拌翼が設けられた掘削軸を、回
転しつつ掘削土と充填剤とを混合攪拌する地盤改良装置
において、前記ビットと攪拌翼の間及び攪拌翼と攪拌翼
の間の少なくとも一方の間に位置すると共に前記掘削軸
に共回り防止板を回動自在に支持し、前記共回り防止板
の長さを前記ビットの掘削径より僅かに小さく設定する
と共に前記共回り防止板の外端部には所定角度屈曲した
傾斜面を形成し、該傾斜面と掘削孔壁とで形成された楔
状空間で前記共回り防止板を静止させることを特徴とす
る。Means for Solving the Problems In order to achieve the above object, the present invention relates to a ground improvement apparatus for mixing and stirring excavated soil and filler while rotating an excavation shaft provided with a bit and a stirring blade. , Between the bit and the stirring blade and at least one between the stirring blade and the stirring blade, rotatably supports a co-rotation prevention plate on the excavation axis, the length of the co-rotation prevention plate The bit is set to be slightly smaller than the excavation diameter, and an inclined surface bent at a predetermined angle is formed at the outer end of the co-rotation preventing plate, and the common space is formed by a wedge-shaped space formed by the inclined surface and the wall of the excavation hole. The anti-rotation plate is stationary.
【０００７】[0007]
【作用】本考案によれば、防止手段の共回り防止板をビ
ットと攪拌翼の間及び攪拌翼と攪拌翼の間の少なくとも
一方の間に回動自在に支持し、この共回り防止板の長さ
をビットの掘削径より僅かに小さく設定した。また、共
回り防止板の外端部には所定角度屈曲した傾斜面を形成
して傾斜面と掘削孔壁とで楔状空間を形成した。従っ
て、この楔状空間に共回り防止板の回動方向側の掘削土
が充填されて圧密されて掘削土が流れるので、圧密され
た掘削土が障害になって共回り防止板が静止状態に保持
される。According to the present invention, the co-rotation preventing plate of the preventing means is rotatably supported between the bit and the stirring blade and at least between the stirring blade and the stirring blade. The length was set slightly smaller than the drilling diameter of the bit. In addition, an inclined surface bent at a predetermined angle was formed at the outer end of the co-rotation preventing plate, and a wedge-shaped space was formed by the inclined surface and the wall of the excavation hole. Therefore, the excavated soil in the rotation direction side of the co-rotation prevention plate is filled in the wedge-shaped space, and the excavated soil flows because the excavated soil flows. Is done.
【０００８】[0008]
【実施例】以下添付図面に従って本考案に係る地盤改良
装置の好ましい実施例について詳説する。図１は本考案
に係る地盤改良装置１０の斜視図であり、同図に示すよ
うに地盤改良装置１０はビット翼１２、攪拌翼１４及び
共回り防止板２２を備えている。ビット翼１２、１２…
は掘削軸１８の下端部に段違い十字状に配置されてい
て、十字状の一辺の長さ（すなわち、直線状に配置され
たビット翼１２、１２の長さ）はＤ1 に設定されてい
る。ビット翼１２の下端部にはカッタビット１２Ａ、１
２Ａ…が形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the soil improvement device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a soil improvement device 10 according to the present invention. As shown in FIG. 1, the soil improvement device 10 includes a bit blade 12, a stirring blade 14, and a co-rotation prevention plate 22. Bit wings 12, 12 ...
Are arranged in a stepped cross at the lower end of the excavation shaft 18, and the length of one side of the cross (that is, the length of the bit wings 12, 12 arranged linearly) is set to D 1 . . Cutter bits 12A, 1
2A are formed.
【０００９】ビット翼１２の上方の掘削軸１８には攪拌
翼１４が段違い十字状に配置されている。十字状の一辺
の長さ（すなわち、直線状に配置された攪拌翼１４、１
４の長さ）は、ビット翼１２と同様にＤ1 に設定されて
いて、攪拌翼１４は水平面に対して僅かに回転方向に傾
斜した状態で配置されている。また、攪拌翼１４とビッ
ト翼１２間には共回り防止板２２が回動自在に支持され
ている。On the excavating shaft 18 above the bit blade 12, the stirring blade 14 is arranged in a stepped cross shape. The length of one side of the cross (that is, the stirring blades 14, 1 arranged linearly)
The length of 4) is preset in the same manner as the bit blade 12 to D 1, agitating blades 14 are arranged in an inclined slightly rotating direction with respect to the horizontal plane. A co-rotation prevention plate 22 is rotatably supported between the stirring blade 14 and the bit blade 12.
【００１０】すなわち、共回り防止板２２が掘削軸１８
に回動自在に支持されていて、共回り防止板２２は掘削
軸１８のフランジ１８Ａ、１８Ａで上下方向の移動が阻
止される。この場合、共回り防止板２２の長さＤ2 はビ
ット翼１２及び攪拌翼１４の長さＤ1 より僅かに小さく
設定されている。従って、共回り防止板２２の外端部
は、ビット翼１２、１２…で掘削された掘削孔２４の壁
面２４Ａの近傍に位置する。That is, the co-rotation preventing plate 22 is connected to the excavating shaft 18.
The co-rotation preventing plate 22 is prevented from moving in the vertical direction by the flanges 18A, 18A of the excavation shaft 18. In this case, the length D 2 of the co-rotation preventing plate 22 is slightly smaller set than the length D 1 of the bit blades 12 and the stirring blade 14. Therefore, the outer end of the co-rotation prevention plate 22 is located near the wall surface 24A of the excavation hole 24 excavated by the bit blades 12, 12,.
【００１１】また、共回り防止板２２は板材で形成され
ていて、共回り防止板２２の回動方向側の外端部には所
定角度屈曲した傾斜面を有する折曲部２２Ａが形成され
ている。そして、傾斜状の折曲部２２Ａと掘削孔２４の
壁面２４Ａは楔状の空間３０（図２参照）を形成する。
この場合、共回り防止板２２の外端部は、ビット翼１
２、１２…で掘削された掘削孔２４の壁面２４Ａの近傍
に位置するので、楔状の空間３０の先端の隙間は掘削土
３１が通りにくくなるようなっている。従って、図２上
で共回り防止板２２が時計回り方向に回動すると、掘削
土３１が楔状の空間３０に充填されて圧密された状態で
は掘削土が移動するので、圧密された掘削土３１が障害
となって共回り防止板２２の回動を阻止する。また共回
り防止板２２は、一体ものに限らず２つ割のものをボル
ト等で固定して使用してもよい。The co-rotation prevention plate 22 is formed of a plate material, and a bent portion 22A having an inclined surface bent at a predetermined angle is formed at an outer end of the co-rotation prevention plate 22 on the rotation direction side. I have. The inclined bent portion 22A and the wall surface 24A of the excavation hole 24 form a wedge-shaped space 30 (see FIG. 2).
In this case, the outer end of the co-rotation prevention plate 22 is
Since it is located in the vicinity of the wall surface 24A of the excavation hole 24 excavated at 2, 12,..., The excavated soil 31 does not easily pass through the gap at the tip of the wedge-shaped space 30. Therefore, when the co-rotation preventing plate 22 rotates clockwise in FIG. 2, the excavated soil 31 moves in a state where the excavated soil 31 is filled in the wedge-shaped space 30 and is compacted. Obstructs the rotation of the co-rotation prevention plate 22. Further, the co-rotation prevention plate 22 is not limited to one, and may be used by fixing it with a bolt or the like.
【００１２】次に、前記の如く構成された地盤改良装置
１０の作用について説明する。先ず、地盤改良装置１０
を所定の掘進機構に取り付け、掘進機構を作動して地盤
改良装置１０の掘削軸１８を時計回り方向に回動する。
同時に地盤改良装置１０を下降する。これにより、ビッ
ト翼１２、１２…で地盤が掘削されて掘削孔２４が形成
され。そして、掘削孔２４内には地盤を掘削した掘削土
３１と、掘削軸１８の下端部から供給されたセメントミ
ルク等の充填剤３０とが充填された状態になっている。Next, the operation of the ground improvement apparatus 10 configured as described above will be described. First, the ground improvement device 10
Is mounted on a predetermined excavation mechanism, and the excavation mechanism is operated to rotate the excavation shaft 18 of the ground improvement device 10 clockwise.
At the same time, the ground improvement device 10 is lowered. As a result, the ground is excavated by the bit wings 12, 12,. Then, the drilled hole 24 with excavated soil 31 excavated soil, and Sementomi <br/> filler 30 such Torque supplied from the lower end of the drilling shaft 18 is in the state of being filled.
【００１３】さらに、地盤改良装置１０を下降すると、
共回り防止板２２が掘削孔２４内に貫入する。この場
合、掘削土３１及び充填剤３０はビット翼１２、１２…
の回転で、時計回り方向に回転してるので、掘削孔２４
内に貫入した共回り防止板２２は掘削孔２４内の掘削土
３１及び充填剤３２と共に時計回り方向に回転する。し
かしながら、掘削土３１及び充填剤３２が楔状の空間３
０に充填されて圧密されるので、圧密された掘削土３１
が障害となって共回り防止板２２の回動が阻止される。
これにより、共回り防止板２２は回転が静止した状態で
掘削土３１内に貫入する。従って、共回り防止板２２が
堰のような役割を果たすので、ビット翼１２、１２…と
共に回転している掘削土３１及び充填剤３２が共回り防
止板２２で堰止めされて静止する。Further, when the ground improvement device 10 is lowered,
The co-rotation prevention plate 22 penetrates into the borehole 24. In this case, the excavated soil 31 and the filler 30 are the bit blades 12, 12,.
With the rotation of, the drilling hole 24 rotates clockwise.
The co-rotation prevention plate 22 penetrating into the inside rotates together with the excavated soil 31 and the filler 32 in the excavation hole 24 in the clockwise direction. However, the excavated soil 31 and the filler 32 are in the wedge-shaped space 3.
0 and compacted, so the compacted excavated soil 31
Is an obstacle, and the rotation of the co-rotation prevention plate 22 is prevented.
Thereby, the co-rotation prevention plate 22 penetrates into the excavated soil 31 with the rotation stopped. Therefore, the co-rotation prevention plate 22 plays a role of a weir, so that the excavated soil 31 and the filler 32 that are rotating together with the bit blades 12 are stopped by the co-rotation prevention plate 22 and stopped.
【００１４】この状態で、さらに地盤改良装置１０を下
降して攪拌翼１４、１４…を掘削土３１及び充填剤３０
内に貫入する。攪拌翼１４、１４…は掘削軸１８に固定
されているので、時計回り方向に回転しながら掘削土３
１及び充填剤３２内に貫入する。従って、共回り防止板
２２で堰止めされて静止した掘削土３１及び充填剤３２
が、共回り防止板２２の上方に移動するので、静止した
掘削土３１の土塊は攪拌翼１４、１４…で剪断粉砕され
る。そして、剪断粉砕された掘削土３１と充填剤３２は
攪拌翼１４、１４…で攪拌される。従って、掘削土３１
や充填剤３０の攪拌、混合性能の向上を図ることができ
るので、地盤改良の質の向上が図られる。In this state, the ground improvement device 10 is further lowered, and the stirring blades 14, 14,.
Penetrate inside. Since the stirring blades 14, 14,... Are fixed to the excavating shaft 18, the excavated soil 3 is rotated while rotating clockwise.
1 and the filler 32. Therefore, the excavated soil 31 and the filler 32 that are stopped and stopped by the
Moves above the co-rotation preventing plate 22, so that the earth mass of the stationary excavated soil 31 is sheared and ground by the stirring blades 14, 14,. The excavated soil 31 and the filler 32 that have been sheared and ground are agitated by the agitating blades 14, 14,. Therefore, the excavated soil 31
In addition, it is possible to improve the performance of stirring and mixing the filler 30 and the quality of the ground improvement.
【００１５】前記実施例では共回り防止板２２の傾斜状
の折曲部２２Ａを共回り防止板２２の回転方向側に設け
たが、これに限らず、図３に示すように共回り防止板３
６の外端部を共回り防止板３６の回転方向側と反対側に
折り曲げた折曲部３６Ａを形成してもよい。この場合、
掘削土３１及び充填剤が楔状の空間３８に充填されて圧
密されるので、圧密された掘削土３１及び充填剤が障害
となって共回り防止板３６の回動が阻止される。尚、図
３上で図２と同一類似部材については同一符号を付して
説明を省略する。In the above embodiment, the inclined bending portion 22A of the co-rotation prevention plate 22 is provided on the rotation direction side of the co-rotation prevention plate 22. However, the present invention is not limited to this, and as shown in FIG. 3
A bent portion 36A may be formed by bending the outer end portion of No. 6 to the side opposite to the rotation direction of the co-rotation prevention plate 36. in this case,
Since the excavated soil 31 and the filler are filled in the wedge-shaped space 38 and compacted, the compacted excavated soil 31 and the filler serve as obstacles to prevent rotation of the co-rotation prevention plate 36. Note that the same reference numerals in FIG. 3 denote the same or similar members as in FIG. 2, and a description thereof will be omitted.
【００１６】 前記実施例では共回り防止板２２や共回
り防止板３６を直線状に配設したがこれに限定されるも
のではない。また、共回り防止板２２や共回り防止板３
６は攪拌翼１４と１４の間に設けてもよい（図４参
照）。さらに、充填剤３２はビット軸１８の先端部以外
にビット近傍のビット軸側面から掘削孔内に供給しても
よい。In the above embodiment, the co-rotation prevention plate 22 and the co-rotation prevention plate 36 are arranged in a straight line, but the invention is not limited to this. In addition, the co-rotation prevention plate 22 and the co-rotation prevention plate 3
6 may be provided between the stirring blades 14 (see FIG. 4). Further, the filler 32 may be supplied into the borehole from the side of the bit shaft near the bit other than the tip of the bit shaft 18.
【００１７】[0017]
【考案の効果】以上説明したように、本考案に係る地盤
改良装置によれば、共回り防止板の長さをビットの掘削
径より僅かに小さく設定して、共回り防止板の外端部に
は所定角度屈曲した傾斜面を形成して傾斜面と掘削孔壁
とで楔状空間を形成した。この楔状空間に充填された掘
削土は圧密されて共回り防止板を静止状態に保持する。
これにより、ビットと共に回転している掘削土が共回り
防止板で堰止めされて静止して、静止した掘削土の土塊
は攪拌翼で剪断粉砕される。As described above, according to the ground improvement device of the present invention, the length of the co-rotation prevention plate is set slightly smaller than the excavation diameter of the bit, and the outer end portion of the co-rotation prevention plate is set. A wedge-shaped space is formed by the inclined surface and the wall of the excavation hole. The excavated soil filled in the wedge-shaped space is compacted to keep the co-rotation preventing plate stationary.
As a result, the excavated soil that is rotating together with the bit is stopped by the co-rotation prevention plate and stopped, and the earth mass of the excavated soil that has stopped is sheared and ground by the stirring blade.
【００１８】このように、共回り防止板の長さをビット
の掘削径より僅かに小さく設定して、掘削孔の外側の地
盤に貫入させずに共回り防止板の回動を阻止することが
できるので、共回り防止板の両端部を掘削孔の外側の地
盤に貫入させる必要がない。従って、掘削孔の壁面を崩
したり、硬い地質や礫等に当接した場合礫等が障害とな
って共回り防止板が地盤に貫入できないというトラブル
の発生を防止することができる。As described above, it is possible to prevent the rotation of the co-rotation prevention plate by setting the length of the co-rotation prevention plate to be slightly smaller than the excavation diameter of the bit without penetrating the ground outside the excavation hole. Since it is possible, it is not necessary to penetrate both ends of the co-rotation prevention plate into the ground outside the excavation hole. Therefore, it is possible to prevent the occurrence of a trouble that the wall of the excavation hole is broken or the ground comes into contact with hard geology or gravel, etc., so that the gravel or the like becomes an obstacle and the co-rotation preventing plate cannot penetrate the ground.
【図１】本考案に係る地盤改良装置の斜視図FIG. 1 is a perspective view of a ground improvement device according to the present invention.
【図２】図１のＡ−Ａ矢視図FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;
【図３】本考案に係る地盤改良装置の他の実施例を示す
要部拡大図FIG. 3 is an enlarged view of a main part showing another embodiment of the ground improvement device according to the present invention.
【図４】本考案に係る地盤改良装置の他の実施例を示す
斜視図FIG. 4 is a perspective view showing another embodiment of the ground improvement device according to the present invention.
Claims (1)
を、回転しつつ掘削土と充填剤とを混合攪拌する地盤改
良装置において、 前記ビットと攪拌翼の間及び攪拌翼と攪拌翼の間の少な
くとも一方の間に位置すると共に前記掘削軸に共回り防
止板を回動自在に支持し、前記共回り防止板の長さを前
記ビットの掘削径より僅かに小さく設定すると共に前記
共回り防止板の外端部には所定角度屈曲した傾斜面を形
成し、該傾斜面と掘削孔壁とで形成された楔状空間を設
けたことを特徴とする地盤改良装置。1. A ground improvement device for mixing and agitating excavated soil and a filler while rotating an excavation shaft provided with a bit and a stirring blade, wherein: between the bit and the stirring blade and between the stirring blade and the stirring blade. And a rotatable anti-rotation plate is rotatably supported on the excavation shaft, the length of the co-rotation prevention plate is set to be slightly smaller than the excavation diameter of the bit, and the co-rotation prevention plate is set. A ground improvement device characterized in that an inclined surface bent at a predetermined angle is formed at an outer end portion of a plate, and a wedge-shaped space formed by the inclined surface and a wall of an excavation hole is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3878293U JP2538052Y2 (en) | 1993-07-15 | 1993-07-15 | Ground improvement equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3878293U JP2538052Y2 (en) | 1993-07-15 | 1993-07-15 | Ground improvement equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0710032U JPH0710032U (en) | 1995-02-10 |
| JP2538052Y2 true JP2538052Y2 (en) | 1997-06-04 |
Family
ID=12534870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3878293U Expired - Lifetime JP2538052Y2 (en) | 1993-07-15 | 1993-07-15 | Ground improvement equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2538052Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6347885B1 (en) * | 2017-12-01 | 2018-06-27 | 有限会社 櫂設計事務所 | Drilling and stirring tools |
| JP7102632B1 (en) * | 2022-01-11 | 2022-07-19 | 昌尚 橋本 | Ground improvement machine |
-
1993
- 1993-07-15 JP JP3878293U patent/JP2538052Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0710032U (en) | 1995-02-10 |
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