JPS6222783B2 - - Google Patents
Info
- Publication number
- JPS6222783B2 JPS6222783B2 JP57020331A JP2033182A JPS6222783B2 JP S6222783 B2 JPS6222783 B2 JP S6222783B2 JP 57020331 A JP57020331 A JP 57020331A JP 2033182 A JP2033182 A JP 2033182A JP S6222783 B2 JPS6222783 B2 JP S6222783B2
- Authority
- JP
- Japan
- Prior art keywords
- spherical
- bulge
- diameter
- core body
- pipe
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0003—Discharging moulded articles from the mould
- B29C37/0014—Discharging moulded articles from the mould by flexibly or permanently deforming undercut portions of the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/261—Moulds having tubular mould cavities
- B29C45/2612—Moulds having tubular mould cavities for manufacturing tubular articles with an annular groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
- B29C65/665—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using shrinking during cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/61—Joining from or joining on the inside
- B29C66/612—Making circumferential joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/118—Single monotone curved joints
- B29C66/1182—Single monotone curved joints the joint being C-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/24—Pipe joints or couplings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints; Joints allowing movement
- F16L27/02—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction
- F16L27/04—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction with partly-spherical engaging surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Joints Allowing Movement (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 この発明は球状管継手の製造方法に関する。[Detailed description of the invention] The present invention relates to a method for manufacturing a spherical pipe joint.
従来、配管の接続方向にある程度の自由度を持
たせる必要がある場合、第１図に示すように、管
端部Ａが球状に膨出され、内部に球状外面を有す
る管継手用アダプターＢが回転自在に装着されて
なる球状管継手Ｃが用いられることがある。 Conventionally, when it is necessary to have a certain degree of freedom in the connection direction of pipes, a pipe fitting adapter B is used in which the pipe end A is bulged into a spherical shape and the inside has a spherical outer surface, as shown in Fig. 1. A rotatably mounted spherical pipe joint C is sometimes used.
この球状管継手Ｃは、管の球状膨出部A′内に
おいて管継手用アダプターＢが自由に回転し得る
から、この管継手用アダプターＢに挿入接続され
た管Ｄの接続方向を任意に変更し得る。 In this spherical pipe fitting C, since the pipe fitting adapter B can freely rotate within the spherical bulge A' of the pipe, the connection direction of the pipe D inserted and connected to this pipe fitting adapter B can be arbitrarily changed. It is possible.
ところで、従来、この種球状管継手Ｃを製造す
る場合、管継手用アダプターＢの外径が管端部Ａ
の開口内径よりも大きくされているため、管継手
用アダプターＢの挿入に際し、管端部Ａの球状膨
出部を軸方向に分割可能に成形し、管継手用アダ
プターＢを挿入後、球状膨出部を例えばボルトに
よる締結、又は接着剤により復元接合したり、あ
るいは予め球状に形成した管端部Ａの開口端より
管継手用アダプターＢを弾性限界内の力を加えて
長円形状に圧縮変形させて押し込み、しかる後、
膨出部内において管継手用アダプターＢを復元さ
せることなどが行われているが、前者の場合、球
状膨出部の復元接合に手間が掛る上、接合部分の
分離又は剥離等が生じるおそれがあり、長期間の
使用に対する信頼性が低い問題があり、又、後者
の場合は、前者のような問題はない反面、管継手
用アダプターＢを押し込むにあたつて、Ａの開口
部の肉厚を強化補強した場合（高圧送に使用の場
合）は特に、これを変形させるため強大な加圧装
置を必要とし、設備が大掛りとなるといつた問題
があつた。 By the way, conventionally, when manufacturing this kind of spherical pipe joint C, the outer diameter of the pipe joint adapter B is the same as that of the pipe end A.
Since the inner diameter of the opening is larger than the inner diameter of the opening, when inserting the adapter B for a pipe fitting, the spherical bulge of the tube end A is molded to be splittable in the axial direction, and after inserting the adapter B for a pipe fitting, the spherical bulge For example, the protruding part is fastened with bolts or restored with adhesive, or the pipe fitting adapter B is compressed into an elliptical shape by applying a force within the elastic limit from the open end of the pipe end A, which has been previously formed into a spherical shape. After deforming and pushing,
Although attempts have been made to restore the pipe fitting adapter B within the bulge, in the former case, it takes time and effort to restore and join the spherical bulge, and there is a risk of separation or peeling of the joint. In the latter case, there is a problem of low reliability for long-term use, and while the latter does not have the same problem as the former, when pushing in the pipe fitting adapter B, it is important to check the thickness of the opening of A. Particularly when reinforcing the material (when used for high-pressure feeding), a powerful pressurizing device is required to deform the material, which poses the problem of requiring large-scale equipment.
この発明は上記問題に鑑み、内部に管継手用ア
ダプターが回転自在に装着された球状管継手を容
易に製造し得る方法を得ることを目的としてなさ
れたものであつて、射出成形により、一端が球殻
状に膨出された管を成形し、該管の球状膨出部の
少なくとも開口端側半球部が弾性範囲内の温度条
件にあるうちに、該部分の外径を除去すると共
に、中子体を縮径することなく、前記成形された
球状膨出部の弾性を利用し、該球状膨出部開口を
弾性的に拡径することにより除去し、次いで予め
別途成形した球状外面を有する管継手用アダプタ
ーをその外周にゴムリングを装着して前記球殻状
膨出部内に、再び弾性的に拡径して挿入し、しか
る後に前記球殻状膨出部の開口端側半球部を成形
することを特徴とするものである。 In view of the above-mentioned problems, the present invention was made with the aim of providing a method for easily manufacturing a spherical pipe joint in which a pipe joint adapter is rotatably mounted. A tube bulged into a spherical shell shape is formed, and while at least the hemispherical portion on the open end side of the spherical bulge portion of the tube is under temperature conditions within the elastic range, the outer diameter of the portion is removed, and the middle portion is removed. The device is removed by elastically expanding the opening of the spherical bulge using the elasticity of the molded spherical bulge without reducing the diameter of the body, and then has a spherical outer surface formed separately in advance. A rubber ring is attached to the outer periphery of the pipe fitting adapter, and the diameter is elastically expanded and inserted into the spherical shell-shaped bulge again, and then the hemisphere on the open end side of the spherical shell-shaped bulge is inserted. It is characterized by being molded.
次に、この発明を実施例により説明する。 Next, the present invention will be explained with reference to examples.
第２図〜第５図はこの発明の実施状態を工程順
に示した断面図である。 FIGS. 2 to 5 are cross-sectional views showing the implementation state of the present invention in the order of steps.
この発明の球状管継手の製造方法は、まず第２
図に示すように外型１Ａが軸と直角方向（矢印Ｐ
方向）に二分割可能とされ、内部に中子体１Ｂが
配置された金型１により合成樹脂材料の射出成形
によつて、一端２Ａが球殻状膨出された管２を成
形し、この管２の球状膨出部２Ａの少なくとも開
口端側半球部２A′（図にＬで示す範囲）が弾性
範囲内の温度条件にあるうちに該部分の外径１
A′を第３図に示すように除去すると共に中子体
１Ｂを強制的に引き抜く。 The method for manufacturing a spherical pipe joint of the present invention begins with the second method.
As shown in the figure, the outer mold 1A is placed in the direction perpendicular to the axis (arrow P
A tube 2 with one end 2A bulging out in the shape of a spherical shell is formed by injection molding of a synthetic resin material using a mold 1 which can be divided into two in the direction (direction) and has a core body 1B disposed inside. While at least the hemispherical part 2A' on the open end side of the spherical bulging part 2A of the tube 2 (the range indicated by L in the figure) is under the temperature condition within the elastic range, the outer diameter 1 of this part
A' is removed as shown in FIG. 3, and the core body 1B is forcibly pulled out.
このとき、球状膨出部２A′は、弾性範囲内の
温度条件とされているため、中子体１Ｂを縮径す
ることなく、強制的に引き抜いても、開口部２Ｂ
は、弾性的に拡径されるから、破断することがな
く、又、中子体１Ｂを引き抜いた後は、第３図に
図示するように開口部はもとの形状に復元してし
まう。 At this time, since the temperature condition of the spherical bulging part 2A' is within the elastic range, even if the core body 1B is forcibly pulled out without reducing its diameter, the opening 2B
Since the diameter of the core body 1B is expanded elastically, it will not break, and after the core body 1B is pulled out, the opening will return to its original shape as shown in FIG.
次いで、予め別途成形した球状外面を有する管
継手用アダプター３を前記球状膨出部２A′が弾
性範囲内の温度条件にあるうちに、中子体１Ｂを
引き抜いたときと同様にして開口部２Ｂを弾性的
に拡径変形し、上記管継手用アダプター３の外周
にゴムリングを装着した状態で、球状膨出部２Ａ
内にいわば強制的に押し込む。 Next, while the temperature condition of the spherical bulging part 2A' is within the elastic range, the pipe fitting adapter 3 having a spherical outer surface which has been separately molded in advance is inserted into the opening 2B in the same manner as when the core body 1B was pulled out. is elastically expanded in diameter, and a rubber ring is attached to the outer periphery of the pipe fitting adapter 3, and the spherical bulging portion 2A is
Forcibly push it inside.
このとき、開口部は弾性範囲内の温度条件にあ
るから、開口部２Ｂの形状は第４図に図示のよう
に復元してしまう。 At this time, since the opening is under a temperature condition within the elastic range, the shape of the opening 2B is restored as shown in FIG. 4.
しかる後に、第５図に示すように、この管継手
用アダプターを内部支持体として球殻状膨出部の
拡径部外周に中心方向（矢印Ｑ）への圧力を加え
て球状に整形し、冷却硬化させるのである。 Thereafter, as shown in FIG. 5, using this pipe fitting adapter as an internal support, pressure is applied to the outer periphery of the enlarged diameter part of the spherical shell-shaped bulge part in the direction of the center (arrow Q) to shape it into a spherical shape. It is cooled and hardened.
尚、中心方向（矢印Ｑ）への圧力を加える手段
として、第５図に図示したように、成形金型１
A′を用いて行うことのほか、第６図に示すよう
に管２内部を真空引きし、大気圧を利用して、拡
径変形した球殻状膨出部２A′を整形しても良
い。 In addition, as a means for applying pressure in the center direction (arrow Q), as shown in FIG.
In addition to using A', as shown in Fig. 6, the inside of the tube 2 may be evacuated and atmospheric pressure may be used to reshape the spherical shell-like bulge 2A' that has expanded in diameter. .
この発明は以上のように構成されているので、
外面球状をなす管継手用アダプターを管端の球状
膨出部内に挿入する場合、いずれにも無理な応力
が加わることがなく、挿入が簡単に行え、しか
も、ゴムリングを装着した状態で管継手用アダプ
ターを挿入しても、管継手用アダプターは変形さ
れることがないため、アダプター挿入時、又は挿
入後において、ゴムリングが反転したり、捩れた
りすることがなく、水密性を保証することができ
るのである。 Since this invention is configured as described above,
When inserting a pipe fitting adapter with a spherical outer surface into the spherical bulge at the end of the pipe, it is easy to insert without applying undue stress to either part, and the fitting can be inserted easily with the rubber ring attached. The pipe fitting adapter will not be deformed even when the adapter is inserted, so the rubber ring will not turn over or twist when the adapter is inserted or after it is inserted, ensuring watertightness. This is possible.
又、本発明の実施に際しても、中子体は縮径金
型とする必要がなく、構造の簡単なものを用いれ
ば良いので、実施も容易であるなどの種々の効果
を有する。 Furthermore, when carrying out the present invention, the core body does not need to be a diameter-reduced mold, and a core body with a simple structure can be used, so that it has various effects such as being easy to implement.
第１図は球状管継手の断面図、第２図〜第６図
はこの発明の実施における工程を示す説明図であ
る。
１……金型、１Ａ……外型、１Ｂ……中子体、
２……管、２Ａ……一端、２A′……球殻状膨出
部、２Ｂ……開口部、３……管継手用アダプタ
ー、４……ゴムリング。
FIG. 1 is a sectional view of a spherical pipe joint, and FIGS. 2 to 6 are explanatory diagrams showing steps in implementing the invention. 1...mold, 1A...outer mold, 1B...core body,
2...Pipe, 2A...One end, 2A'...spherical shell-like bulge, 2B...opening, 3...pipe joint adapter, 4...rubber ring.
Claims (1)
管を成形し、該管の球状膨出部の少なくとも開口
端側半球部が弾性範囲内の温度条件にあるうち
に、該部分の外型を除去すると共に、中子体を縮
径することなく、前記成形された球状膨出部の弾
性を利用し、該球状膨出部開口を弾性的に拡径す
ることにより除去し、次いで予め別途成形した球
状外面を有する管継手用アダプターをその外周に
ゴムリングを装着して前記球殻状膨出部内に、再
び弾性的に拡径して挿入し、しかる後に前記球殻
状膨出部の開口端側半球部を成形することを特徴
とする球状管継手の製造方法。1. A tube with one end bulged into a spherical shell shape is formed by injection molding, and while at least the hemispherical portion on the open end side of the spherical bulge portion of the tube is under temperature conditions within the elastic range, the outside of the portion is The mold is removed, and the core body is removed by elastically enlarging the diameter of the opening of the spherical bulge using the elasticity of the molded spherical bulge without reducing the diameter of the core body. A separately molded pipe fitting adapter having a spherical outer surface is fitted with a rubber ring on its outer periphery, and is inserted into the spherical shell-shaped bulge again with its diameter expanded elastically, and then the spherical shell-shaped bulge is inserted. A method for manufacturing a spherical pipe joint, characterized by forming a hemispherical portion on the open end side of the spherical pipe joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57020331A JPS58138625A (en) | 1982-02-10 | 1982-02-10 | Production of spherical pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57020331A JPS58138625A (en) | 1982-02-10 | 1982-02-10 | Production of spherical pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58138625A JPS58138625A (en) | 1983-08-17 |
| JPS6222783B2 true JPS6222783B2 (en) | 1987-05-20 |
Family
ID=12024151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57020331A Granted JPS58138625A (en) | 1982-02-10 | 1982-02-10 | Production of spherical pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58138625A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100421608B1 (en) * | 2001-07-19 | 2004-03-12 | 한국미라이공업 주식회사 | Injection Molding System of Forming Products having Undercut on Inside |
-
1982
- 1982-02-10 JP JP57020331A patent/JPS58138625A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58138625A (en) | 1983-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4359053A (en) | Means of fastening silicone tubing to a rigid surgical needle | |
| JP2587449Y2 (en) | Piping joint mechanism | |
| JPS60118339A (en) | Metal forming device | |
| JPS59156730A (en) | Mold releasing method for inner mold in rubber like elastic molded product | |
| JPS6153597B2 (en) | ||
| US5560396A (en) | Rigid end socket for flexible tubing and method of making same | |
| JPS6222783B2 (en) | ||
| US7143991B2 (en) | Reinforcing bar joint sleeve fixing device | |
| EP0518679B1 (en) | Improvements in or relating to tube coupling bodies | |
| JPH05293887A (en) | Manufacture of lining pipe joint | |
| JPH0441131A (en) | Seal ring installation device | |
| US4150251A (en) | Screw-on wire connectors | |
| JP2002213662A (en) | Stainless steel pipe joint | |
| JPH1144373A (en) | Valve and manufacturing method thereof | |
| JPH0510487A (en) | Branch pipe fitting | |
| JPS58114912A (en) | Manufacturing method for sewage branch pipes | |
| JPH07158782A (en) | Piping and connecting method of piping | |
| JPH0121393B2 (en) | ||
| JPS5917315B2 (en) | How to form a plastic pipe socket | |
| JPH0360833U (en) | ||
| JPH01206195A (en) | Universal joint | |
| JPH02176276A (en) | valve | |
| JPS6147187U (en) | plastic pipe connections | |
| JPH0882189A (en) | Propulsion tube | |
| GB2264761A (en) | Integral pipe coupling with reflex pipe end |