JPH022037B2 - - Google Patents
Info
- Publication number
- JPH022037B2 JPH022037B2 JP56129875A JP12987581A JPH022037B2 JP H022037 B2 JPH022037 B2 JP H022037B2 JP 56129875 A JP56129875 A JP 56129875A JP 12987581 A JP12987581 A JP 12987581A JP H022037 B2 JPH022037 B2 JP H022037B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- bending
- diameter
- mold
- wall
- 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
- Branch Pipes, Bends, And The Like (AREA)
- Forging (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
この考案は、自動車のシートフレーム・パイプ
として用いる曲げ箇所を備えたパイプおよび、該
パイプの曲げ加工方法に関し、特に、薄肉の金属
丸パイプを小さい曲率半径に曲げる場合に有効に
採用されるものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a pipe with bending points used as an automobile seat frame pipe and a method for bending the pipe, and in particular, it relates to a method for bending a thin-walled metal round pipe with a small curvature. This is effectively used when bending to a radius.
従来の技術及び、発明が解決しようとする課題
従来、自動車のシートフレームに用いるパイプ
は、薄肉の金属製丸パイプを小さい曲率半径に曲
げ加工して用いている。一般的に、パイプの最小
曲げ曲率は機械構造用炭素鋼鋼管（STKM11A）
で、180度曲げ（折り返し）の場合、内側半径は
パイプ外径(D)の４培（4D）とされており、この
数値以下になると、内壁にシワが生じると共に、
第１図Ａ，Ｂに示す如く、パイプ１の曲げＲ芯の
断面が偏平化し強度が低下するのを防止出来ない
とされている。Prior Art and Problems to be Solved by the Invention Conventionally, pipes used in automobile seat frames have been made by bending thin-walled metal round pipes into a small radius of curvature. Generally, the minimum bending curvature of pipe is carbon steel pipe for mechanical structure (STKM11A)
In the case of 180 degree bending (folding), the inner radius is 4 times the pipe outer diameter (D) (4D), and if it is less than this value, wrinkles will occur on the inner wall, and
As shown in FIGS. 1A and 1B, it is said that it is impossible to prevent the cross section of the bent R core of the pipe 1 from becoming flattened and its strength decreasing.
従つて、この発明は、上記最小曲げ曲率よりも
更に小さい曲げ曲率で、内壁にシワが生成される
ことなく、かつ、強度を低下させることなく曲げ
加工が施される構造のパイプ、及び該パイプの曲
げ加工方法を提供することを目的とするものであ
る。 Therefore, the present invention provides a pipe that can be bent at a bending curvature smaller than the minimum bending curvature without forming wrinkles on the inner wall and without reducing strength, and the pipe. The purpose of this invention is to provide a bending method.
課題を解決するための手段
即ち、本発明は、薄肉の金属製丸型のパイプに
おいて、該パイプの所要箇所に、パイプ直径Ｄに
対して曲率ＲをＲ≒1.7D程度で90度に曲げ加工
した曲げ箇所を設け、該曲げ箇所では曲げＲ芯に
向かい若干偏平化させて、パイプ２の中心Ｐより
縦方向の短径r1を横方向の長径r2より若干短く
し、横方向の直径2r2をパイプの直線部の直径Ｄ
とほぼ同一とし、さらに、該パイプ曲げ箇所の内
壁の全域にわたつて、曲げＲ芯に向かつて突出し
た円弧状の突条を設け、該突条の先端より対向す
る外壁までの長さＳを上記パイプ直径Ｄとほぼ同
一に設定していることを特徴とする自動車用シー
トフレームに用いる曲げ箇所を備えたパイプを提
供するものである。Means for Solving the Problems That is, the present invention involves bending a thin-walled metal round pipe at a 90 degree angle with a curvature R of approximately 1.7D relative to the pipe diameter D at required locations on the pipe. A bending point is provided, and at this bending point, the bending R is slightly flattened toward the core, so that the short axis r 1 in the vertical direction from the center P of the pipe 2 is slightly shorter than the long axis r 2 in the lateral direction, and the diameter in the lateral direction is 2r 2 is the diameter D of the straight part of the pipe
In addition, an arc-shaped protrusion protruding toward the bending R core is provided over the entire inner wall of the pipe bending point, and the length S from the tip of the protrusion to the opposing outer wall is The present invention provides a pipe provided with a bent portion for use in an automobile seat frame, characterized in that the pipe diameter is set to be approximately the same as the pipe diameter D described above.
さらに、本発明は、上記した自動車用シートフ
レームパイプの曲げ箇所を加工する際に、パイプ
の上側外周面をクランプ手段で保持して、パイプ
の下側外周面を曲げ型に嵌合し、パイプの直線部
をクランプ手段と曲げ型との間に定置した後、上
記曲げ型の曲げ型面に対向して上方に配置した押
型取付板を回動し、該押型取付板に取り付けてい
る押型を上記曲げ型の曲げ型面に近接移動し、該
押型の型面と曲げ型の曲げ型面との間にパイプを
嵌合して、押型の移動に応じて上記両方の型面に
沿つてパイプを曲げ加工し、かつ、該曲げ加工時
に、上記両方の型面の半径をパイプの半径より若
干小さく設定していることにより、パイプの曲げ
箇所を曲げＲ芯に向かつてパイプ直径が圧縮して
若干偏平化すると共に、パイプの内壁の余肉を上
記曲げ型面の底面に沿つて形成している溝に逃が
して突出させることにより、パイプの内壁より突
条を一体に形成することを特徴とする自動車用シ
ートフレームパイプの曲げ加工方法を提供するも
のである。 Furthermore, in the present invention, when processing the bent portion of the above-mentioned automobile seat frame pipe, the upper outer circumferential surface of the pipe is held by a clamping means, the lower outer circumferential surface of the pipe is fitted into a bending die, and the pipe is After placing the straight part between the clamping means and the bending die, the press die mounting plate placed above the bending die face of the bending die is rotated, and the press die attached to the press die mounting plate is rotated. The pipe is moved close to the bending mold surface of the bending mold, the pipe is fitted between the mold surface of the pressing mold and the bending mold surface of the bending mold, and the pipe is moved along both of the mold surfaces as the pressing mold moves. By bending the pipe and setting the radii of both die surfaces to be slightly smaller than the radius of the pipe during the bending process, the pipe diameter is compressed as the bending point of the pipe moves toward the bending R core. A feature is that a protrusion is formed integrally with the inner wall of the pipe by making it slightly flattened and allowing the excess wall of the inner wall of the pipe to escape into a groove formed along the bottom surface of the bending mold surface and protrude. The present invention provides a method for bending an automobile seat frame pipe.
実施例
以下、本発明を図面に示す実施例により詳細に
説明する。Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.
第２図Ａ，Ｂは、この発明に係る自動車用シー
トフレームのパイプ２を示し、該パイプ２は、薄
肉の金属製丸型、即ち、直線部においては真円の
円筒形状で、所要の部位に、小さい曲率Ｒ（パイ
プの直径Ｄに対してＲ≒1.7）で90度に曲げ加工
が施されている。 FIGS. 2A and 2B show a pipe 2 of an automobile seat frame according to the present invention, and the pipe 2 is a thin-walled metal round shape, that is, a perfect circular cylindrical shape in the straight section, and the pipe 2 has a shape of a circular cylinder in a straight section. The pipe is bent at 90 degrees with a small curvature R (R≒1.7 relative to the pipe diameter D).
第２図Ａにおいてl1〜l2の範囲で示す上記パイ
プ２の90度の曲げ箇所３は、第２図Ｂに示す如
く、パイプ径の曲げＲ芯Ｏに向かい若干偏平化さ
せ、パイプ中心Ｐより図中縦方向の短径r1を横方
向の長径r2より若干短くしている。かつ、長い方
の横方向の直径2r2はパイプ２の直線部４の直径
Ｄとほぼ同一としている。（2r2≒Ｄ）
また、パイプ２の曲げ箇所３に対応するパイプ
の内壁２ａ、即ち、第２図Ｂにおける縦方向の下
部に、曲げＲ芯Ｏに向かつて突出した円弧状の突
条５が、曲げ箇所３の軸方向の全域にわたつて形
成されている。該突条５の先端より対向する外壁
２ｃまでの長さＳは略パイプ直径Ｄとほぼ同一と
なつている。（Ｓ≒Ｄ）
上記パイプ２の曲げ箇所３では、突条５が形成
されるため、内壁２ａにシワが生成せず、かつ、
突条５により強度が補強されているため、従来の
最小曲げ曲率（Ｒ≒4D）よりさらに小さい曲げ
曲率で曲げることが出来る。しかも、該曲げ箇所
において、偏平化されて径が短くなる図中縦方向
の長さは、対向側に突条５が形成されているため
に、横方向の直径と略同一なつている。このた
め、該曲げ箇所において、縦方向および横方向か
らのいずれも方向からの負荷に対してほぼ均一な
強度を有する。しかも、上記縦・横方向の径は、
曲げ加工していないパイプ２の直線部における真
円形状の縦・横の直径と同様としているため、曲
げ箇所３におけるパイプの強度を直線部４と略同
等とすることが出来る。 The 90 degree bending point 3 of the pipe 2 shown in the range l 1 to l 2 in FIG. 2A is slightly flattened toward the bending R core O of the pipe diameter, as shown in FIG. 2B, and the center of the pipe is From P, the short axis r 1 in the vertical direction in the figure is slightly shorter than the long axis r 2 in the horizontal direction. Moreover, the diameter 2r2 of the longer side in the lateral direction is approximately the same as the diameter D of the straight portion 4 of the pipe 2. (2r 2 ≒D) Furthermore, on the inner wall 2a of the pipe corresponding to the bending point 3 of the pipe 2, that is, on the lower part of the vertical direction in FIG. is formed over the entire area of the bending point 3 in the axial direction. The length S from the tip of the protrusion 5 to the opposing outer wall 2c is approximately the same as the pipe diameter D. (S≒D) Since the protrusion 5 is formed at the bending point 3 of the pipe 2, wrinkles are not generated on the inner wall 2a, and
Since the strength is reinforced by the protrusions 5, it is possible to bend with an even smaller bending curvature than the conventional minimum bending curvature (R≒4D). Moreover, at the bending point, the length in the vertical direction in the figure, where the diameter is shortened by flattening, is approximately the same as the diameter in the horizontal direction because the protrusion 5 is formed on the opposite side. Therefore, the bent portion has substantially uniform strength against loads from both the longitudinal and lateral directions. Moreover, the vertical and horizontal diameters mentioned above are
Since the vertical and horizontal diameters of the straight portion of the unbent pipe 2 are the same as those of the perfect circular shape, the strength of the pipe at the bent portion 3 can be made approximately equal to that of the straight portion 4.
第３図以下は、上記曲げ構造を備えたパイプ２
の曲げ加工装置を示し、６は曲げ型機のフレー
ム、７はフレーム６に固定した曲げ型、８は曲げ
型７の上方に対向させてフレーム６に取り付けた
クランプ手段、９はフレーム６に枢着した駆動手
段を構成するシリンダ、１０はシリンダ９の下向
きロツド９ａに枢着すると共にクランプ手段８に
支軸を介して回転可能に枢着した押型取付板、１
１は押型取付板１０に枢着した押型である。 Figure 3 and the following are pipes 2 with the above bending structure.
6 shows the frame of the bending machine, 7 a bending die fixed to the frame 6, 8 a clamping means attached to the frame 6 facing above the bending die 7, and 9 a pivoting device attached to the frame 6. A cylinder 10 is pivotally connected to the downward rod 9a of the cylinder 9, and a push-type mounting plate 1 is rotatably connected to the clamping means 8 via a support shaft.
Reference numeral 1 denotes a press die pivotally attached to a press die mounting plate 10.
上記曲げ型７は、その曲げ型面７ａの底面に、
曲げＲ芯に向かつて略曲げ箇所全域に断面Ｕ状の
溝７ｂを形成している。また、該曲げ型面７ａお
よび押型１１の型面１１ａを、曲げ加工時に、少
なくともパイプ２の曲げ箇所３の範囲が曲げＲ芯
に向かつて圧縮されるように、パイプ２の管半径
より若干小さい半径に設定している。 The bending die 7 has a bottom surface of the bending die surface 7a,
A groove 7b having a U-shaped cross section is formed substantially throughout the bending portion toward the bending R core. In addition, the bending mold surface 7a and the mold surface 11a of the pressing mold 11 are made slightly smaller than the pipe radius of the pipe 2 so that at least the range of the bending part 3 of the pipe 2 is compressed toward the bending R core during bending. It is set to radius.
上記曲げ加工装置によりパイプ２を曲げ加工す
る際、パイプ２の上側外周面をクランプ手段８で
保持して、パイプ２の下側外周面を曲げ型７に嵌
合する。この状態で、パイプ２の直線部はクラン
プ手段８と曲げ型７との間に定置される。つい
で、シリンダ９を作動してロツド９ａを下降させ
ると押型取付板１０はクランプ枢着点を支点とし
て図中矢印方向に回動される。該回動で押型１１
は曲げ型７の曲げ型面７ａに近接移動し、押型１
１の型面１１ａと曲げ型面７ａとの間にパイプ２
を嵌合し、押型１１の移動に応じて型面１１ａと
７ａに沿つてパイプ２を曲げ加工する。該曲げ加
工により、第３図に示す如く、型面１１ａ，７ａ
の半径をパイプ２の半径より若干小さくしている
ため、パイプ２の曲げ箇所３は曲げＲ芯に向かつ
てパイプ直径が圧縮されるように若干偏平化し、
かつ、パイプ２の内壁の余肉は曲げ型面７ａの溝
７ｂに逃げて突出し、パイプ２の内壁２ａより突
条５が突設され、一体に形成される。 When the pipe 2 is bent by the bending device, the upper outer circumferential surface of the pipe 2 is held by the clamp means 8, and the lower outer circumferential surface of the pipe 2 is fitted into the bending mold 7. In this state, the straight section of the pipe 2 is placed between the clamping means 8 and the bending die 7. Next, when the cylinder 9 is actuated to lower the rod 9a, the press die mounting plate 10 is rotated in the direction of the arrow in the figure using the clamp pivot point as a fulcrum. With this rotation, the mold 11
moves close to the bending die surface 7a of the bending die 7, and the pressing die 1
The pipe 2 is placed between the mold surface 11a of the mold 1 and the bending mold surface 7a.
are fitted, and the pipe 2 is bent along the mold surfaces 11a and 7a according to the movement of the mold 11. By this bending process, as shown in FIG.
Since the radius of the pipe 2 is made slightly smaller than the radius of the pipe 2, the bending point 3 of the pipe 2 is slightly flattened so that the pipe diameter is compressed as it approaches the bending R core.
Further, the excess wall of the pipe 2 escapes into the groove 7b of the bending die surface 7a and protrudes, and the protrusion 5 is provided to protrude from the inner wall 2a of the pipe 2 and is integrally formed.
発明の効果
以上の説明より明らかなように、この発明に係
るパイプの曲げ構造によれば、パイプの曲げ箇所
を曲げ加工時にパイプ直径を圧縮することによ
り、縦方向の径の長さが直交する横方向の径の長
さより短く偏平化するが、該圧縮により曲げ箇所
の内壁側に突条が形成され、該突状先端から対向
部の先端までの縦方向の長さが、直交する横方向
の長さと略同一となり、しかも、該横方向の長さ
を曲げ加工しない直線部の直径とほぼ同一寸法と
しているため、曲げ箇所における強度を直線部と
同等にすることが出来ると共に、曲げ箇所におい
ても縦方向および横方向の強度を同等とすること
が出来る。よつて、該曲げ構造を有するパイプは
特に自動車のシートフレーム・パイプとして好適
に使用されうるものである。しかも、該曲げパイ
プを加工する際に、パイプ曲げ装置のパイプ内側
の型（曲げ型）に逃がし溝を設け、曲げ加工時に
余肉を上記溝内に集める加工方法を用いているた
め、パイプの曲げ箇所の内壁にシワが生成するの
を防止し、逆に補強作用をする上記突条を形成す
ることが出来る。このため、薄肉の金属丸パイプ
を、一般的なパイプの最小曲げ曲率より小さい曲
率で曲げることができ、かつ、小さい曲率で曲げ
た場合にも強度が低下することなく、逆に曲げ箇
所を強化できる利点を有するものである。Effects of the Invention As is clear from the above explanation, according to the pipe bending structure according to the present invention, by compressing the pipe diameter during bending at the bending part of the pipe, the lengths of the longitudinal diameters are perpendicular to each other. Although it is flattened to be shorter than the length of the diameter in the lateral direction, a protrusion is formed on the inner wall side of the bending part due to the compression, and the length in the vertical direction from the tip of the protrusion to the tip of the opposing part is equal to orthogonal to the lateral direction. Moreover, since the length in the lateral direction is approximately the same as the diameter of the straight part that is not bent, the strength at the bent part can be made equal to that of the straight part, and the strength at the bent part can be made equal to that of the straight part. Also, the strength in the longitudinal and lateral directions can be made equal. Therefore, the pipe having the bent structure can be particularly suitably used as a seat frame pipe of an automobile. Moreover, when processing the bent pipe, a relief groove is provided in the mold inside the pipe (bending mold) of the pipe bending device, and the processing method is used to collect excess material into the groove during bending, so that the pipe can be bent easily. It is possible to form the above-mentioned protrusions that prevent wrinkles from forming on the inner wall of the bending portion and, on the contrary, have a reinforcing effect. For this reason, thin-walled metal round pipes can be bent with a curvature smaller than the minimum bending curvature of general pipes, and even when bent with a small curvature, the strength does not decrease, and on the contrary, the bending point is strengthened. It has the advantage of being able to
第１図Ａは従来のパイプの曲げ構造を示す側面
図、第１図Ｂは第１図ＡのＸ−Ｘ線断面図、第２
図Ａはこの発明に係るパイプの曲げ構造を示す側
面図、第２図Ｂは第２図ＡのＹ−Ｙ線断面図、第
３図はパイプの曲げ装置の正面図、第４図は第３
図の側面図、第５図は上記曲げ装置で曲げ加工し
ている状態を示す断面図である。
２……パイプ、３……曲げ箇所、５……突条、
７……曲げ型、７ａ……型面、７ｂ……溝、８…
…クランプ手段、９……シリンダ、１１……押
型、１１ａ……型面。
Figure 1A is a side view showing the bending structure of a conventional pipe, Figure 1B is a sectional view taken along line X-X of Figure 1A, and Figure 1A is a side view showing the bending structure of a conventional pipe.
Figure A is a side view showing the pipe bending structure according to the present invention, Figure 2B is a sectional view taken along the Y-Y line in Figure 2A, Figure 3 is a front view of the pipe bending device, and Figure 4 is the 3
The side view of the figure and FIG. 5 are cross-sectional views showing a state in which bending is being performed by the above-mentioned bending device. 2...Pipe, 3...Bending point, 5...Protrusion,
7...Bending mold, 7a...Mold surface, 7b...Groove, 8...
...Clamping means, 9...Cylinder, 11...Press die, 11a...Mold surface.
Claims (1)
イプの所要箇所に、パイプ直径(D)に対して曲率Ｒ
をＲ≒1.7D程度で90度に曲げ加工した曲げ箇所
３を設け、該曲げ箇所では曲げＲ芯に向かい若干
偏平化させて、パイプの中心（Ｐ）より縦方向の
短径（r1）を横方向の長径（r2）より若干短く
し、横方向の直径（2r2）をパイプの直線部４の
直径(D)とほぼ同一とし、さらに、該パイプ曲げ箇
所の内壁２ａの全域にわたつて曲げＲ芯に向かつ
て突出した円弧状の突条５を設け、該突条の先端
より対向する外壁２ｃまでの長さ（Ｓ）を上記パ
イプ直径Ｄとほぼ同一に設定していることを特徴
とする自動車用シートフレームに用いる曲げ箇所
を備えたパイプ。 ２ パイプ２の上側外周面をクランプ手段８で保
持して、該パイプの下側外周面を曲げ型７に嵌合
し、パイプの直線部４をクランプ手段と曲げ型と
の間に定置した後、 上記曲げ型の曲げ型面７ａに対向して上方に配
置した押型１１を駆動手段により上記曲げ型面に
近接移動し、該押型の型面１１ａと上記曲げ型面
との間にパイプを嵌合して、押型の移動に応じ両
側の型面１１ａ，７ａに沿つてパイプを曲げ加工
し、 かつ、該曲げ加工時に、上記型面１１ａ，７ａ
の半径をパイプの半径より若干小さく設定してお
き、パイプの曲げ箇所３を曲げＲ芯に向かつてパ
イプ直径を圧縮して若干偏平化すると共に、 上記曲げ型面７ａの底面に沿つて溝７ｂを形成
しておき、上記圧縮により生じるパイプの内壁の
余肉を上記溝に逃がして突出させることにより、
パイプの内壁より突出した突条５を一体に形成し
ていることを特徴とする自動車のシートフレーム
用のパイプの曲げ加工方法。[Scope of Claims] 1. A thin-walled metal round pipe 2, which has a curvature R with respect to the pipe diameter (D) at a required location of the pipe.
A bending point 3 is created by bending the pipe to 90 degrees with R≒1.7D, and at this bending point, the bending radius is slightly flattened toward the core of the pipe, and the short diameter (r 1 ) in the longitudinal direction is made from the center (P) of the pipe. is slightly shorter than the major axis (r 2 ) in the lateral direction, the diameter (2r 2 ) in the lateral direction is approximately the same as the diameter (D) of the straight section 4 of the pipe, and the entire inner wall 2a of the bending point of the pipe is An arc-shaped protrusion 5 is provided that protrudes across the bend toward the R core, and the length (S) from the tip of the protrusion to the opposing outer wall 2c is set to be approximately the same as the pipe diameter D. A pipe with bending points for use in automobile seat frames, characterized by: 2. After holding the upper outer circumferential surface of the pipe 2 with the clamping means 8, fitting the lower outer circumferential surface of the pipe into the bending mold 7, and placing the straight part 4 of the pipe between the clamping means and the bending mold. , a press die 11 disposed above the bending die surface 7a of the bending die is moved close to the bending die surface by a driving means, and a pipe is fitted between the die surface 11a of the press die and the bending die surface. At the same time, the pipe is bent along the mold surfaces 11a, 7a on both sides according to the movement of the pressing mold, and during the bending process, the pipe is bent along the mold surfaces 11a, 7a on both sides.
The radius of the pipe is set slightly smaller than the radius of the pipe, and the bending point 3 of the pipe is bent toward the R core to compress the pipe diameter and flatten it slightly, and at the same time, a groove 7b is formed along the bottom surface of the bending mold surface 7a. is formed, and the extra wall of the inner wall of the pipe caused by the compression is allowed to escape into the groove and protrude.
A method for bending a pipe for an automobile seat frame, characterized in that a protrusion 5 protruding from the inner wall of the pipe is integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12987581A JPS5830592A (en) | 1981-08-18 | 1981-08-18 | Bending structure of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12987581A JPS5830592A (en) | 1981-08-18 | 1981-08-18 | Bending structure of pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5830592A JPS5830592A (en) | 1983-02-23 |
| JPH022037B2 true JPH022037B2 (en) | 1990-01-16 |
Family
ID=15020464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12987581A Granted JPS5830592A (en) | 1981-08-18 | 1981-08-18 | Bending structure of pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5830592A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140036965A (en) * | 2012-09-18 | 2014-03-26 | 가부시키가이샤 니프코 | Curved tube structure and mold for molding curved tube |
| CN106796067A (en) * | 2014-10-08 | 2017-05-31 | 三菱电机株式会社 | Refrigerant piping and heat pump assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5854219B2 (en) * | 1975-04-12 | 1983-12-03 | オオタケ ノボル | Rectifier bent pipe |
| JPS52104351A (en) * | 1976-02-28 | 1977-09-01 | Kubota Ltd | Assembled special drain pipe |
-
1981
- 1981-08-18 JP JP12987581A patent/JPS5830592A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5830592A (en) | 1983-02-23 |
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