JPH0217757B2 - - Google Patents
Info
- Publication number
- JPH0217757B2 JPH0217757B2 JP60089512A JP8951285A JPH0217757B2 JP H0217757 B2 JPH0217757 B2 JP H0217757B2 JP 60089512 A JP60089512 A JP 60089512A JP 8951285 A JP8951285 A JP 8951285A JP H0217757 B2 JPH0217757 B2 JP H0217757B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- coating layer
- pipe joint
- pipe fitting
- 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 - Lifetime
Links
- 239000011247 coating layer Substances 0.000 claims description 46
- 230000002093 peripheral effect Effects 0.000 claims description 33
- 229920003002 synthetic resin Polymers 0.000 claims description 26
- 239000000057 synthetic resin Substances 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 description 14
- 230000037431 insertion Effects 0.000 description 14
- 238000001746 injection moulding Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 238000000576 coating method Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は管継手およびその製造方法に関し、特
に金属製管継手の内外周面に合成樹脂被覆層が形
成された管継手およびその製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint and a method for manufacturing the same, and more particularly to a pipe joint in which a synthetic resin coating layer is formed on the inner and outer circumferential surfaces of a metal pipe joint, and a method for manufacturing the same. It is something.
（発明の背景）
金属製の管継手はガス管、水道管、温水管、薬
品管等に用いられているが、防錆、耐蝕性の観点
から、継手内部には、従来から合成樹脂あるいは
防錆塗料が被覆または塗布されている。(Background of the Invention) Metal pipe fittings are used for gas pipes, water pipes, hot water pipes, chemical pipes, etc., but from the viewpoint of rust prevention and corrosion resistance, the interior of the fittings has traditionally been made of synthetic resin or anti-corrosion. Rust paint is coated or applied.
（発明が解決しようとする問題点）
しかしながら、従来、静電塗装法、粉体塗装法
あるいは流動浸漬法によつて内面に被覆が施され
ており、被覆層の厚さがせいぜい10〜800ミクロ
ン程度であつつた。そのため、時間の経過ととも
にその被覆層が剥離したり、摩耗により母材が露
出することがあつた。また、種々の目的により内
周被覆層の厚さを、管径に応じて2.0〜20mm程度
の厚さにする必要があるが、上記の被覆方法では
１度の工程では所望の厚さにできず、厚さが増す
ほど時間がかかつてしまう。そこで、従来におい
ては、例えば特公昭46−36480号公報や特開昭57
−188331号公報（第３図）に記載のように、管継
手の内周に金型を挿入して所定の間隙を形成し、
管継手本体に内外周を貫通する貫通孔の外側から
溶融樹脂材をその内周の間隙に対して射出し、そ
の間隙に溶融樹脂材を充填するものが提案されて
いる。しかし、これら従来の技術では、その内周
面の被覆層が成型後収縮することにより依然とし
て本体表面から剥離するという問題がある。(Problem to be solved by the invention) However, conventionally, the inner surface has been coated by electrostatic coating method, powder coating method or fluidized dipping method, and the thickness of the coating layer is at most 10 to 800 microns. It was moderate. As a result, the coating layer may peel off over time or the base material may be exposed due to wear. In addition, for various purposes, it is necessary to set the thickness of the inner peripheral coating layer to approximately 2.0 to 20 mm depending on the pipe diameter, but with the above coating method, the desired thickness cannot be achieved in one step. However, the thicker it gets, the longer it takes. Therefore, in the past, for example, Japanese Patent Publication No. 46-36480 and Japanese Unexamined Patent Publication No. 57
As described in Publication No. 188331 (Fig. 3), a mold is inserted into the inner periphery of the pipe joint to form a predetermined gap,
It has been proposed that a molten resin material is injected from the outside of a through hole that penetrates the inner and outer peripheries of a pipe joint body into a gap on the inner periphery of the pipe joint body, thereby filling the gap with the molten resin material. However, these conventional techniques still have the problem that the coating layer on the inner peripheral surface shrinks after molding and peels off from the main body surface.
本発明はこのような従来技術の問題点に鑑みな
されたもので、その目的とするところは、管継手
本体に被覆層を設けるにあたり、この被覆層が容
易に剥離することを防止した管継手ならびにその
製造方法を提供するにある。 The present invention was made in view of the problems of the prior art, and its purpose is to provide a pipe fitting that prevents the coating layer from easily peeling off when the coating layer is provided on the pipe fitting body, and The present invention provides a method for manufacturing the same.
（問題点を解決するための手段）
本発明は、管継手内周面の被覆層の剥離を防止
するため、少くとも一端にねじ部が形成された管
継手本体の外周面に被着された合成樹脂被覆層と
内周面に被着された合成樹脂被覆層とが、管継手
本体の周壁に貫通された孔に充填された合成樹脂
により互いに接続されて成る。(Means for Solving the Problems) The present invention provides a coating layer attached to the outer circumferential surface of a pipe fitting main body having a threaded portion formed on at least one end, in order to prevent peeling of the coating layer on the inner circumferential surface of the pipe fitting. The synthetic resin coating layer and the synthetic resin coating layer adhered to the inner circumferential surface are connected to each other by a synthetic resin filled in a hole penetrated through the peripheral wall of the pipe joint body.
好ましくは、管継手内周面の被覆層の厚さを外
周面に比して厚くする。 Preferably, the thickness of the coating layer on the inner peripheral surface of the pipe joint is thicker than that on the outer peripheral surface.
本発明方法は、このような管継手を次のように
して製造するものである。すなわち、少なくとも
一端にねじ部が形成された管継手本体の周壁に貫
通孔を穿設し、射出成型金型に管継手本体を装着
して、ねじ部以外の内外周面との間に所定の間隙
を形成し、その間隙に合成樹脂材を射出注入して
管継手本体のねじ部以外の内外面に被覆層を形成
するものである。 According to the method of the present invention, such a pipe joint is manufactured as follows. That is, a through hole is bored in the peripheral wall of the pipe fitting body, which has a threaded part formed at least on one end, and the pipe fitting main body is mounted in an injection mold to form a predetermined gap between the inner and outer circumferential surfaces other than the threaded part. A gap is formed, and a synthetic resin material is injected into the gap to form a coating layer on the inner and outer surfaces of the pipe joint body other than the threaded portion.
（実施例）
第１図は本発明の一実施例を示し、符号１は鋳
造、または冷間加工により作られた金属製の管継
手本体である。管継手本体１の両端部には雌ねじ
１ａが刻設され、管継手本体１の周壁には、その
周壁を貫通して孔１ｂが穿設されている。管継手
本体１の外周面には、相対的に薄い合成樹脂被覆
層２が被着され、管継手本体１の内周面には、相
対的に厚い合成樹脂被覆層３が被着され、更に貫
通孔１ｂには合成樹脂が充填されている。そし
て、被覆層２と被覆層３は、貫通孔１ｂ内の合成
樹脂を介して接続されている。外周被覆層２は管
継手本体１の両端部から突設されて樹脂製円筒部
４を形成している。なお、第１図においてこのよ
うな内外周被覆層を有する管継手を符号３０で示
してある。(Embodiment) FIG. 1 shows an embodiment of the present invention, and reference numeral 1 indicates a metal pipe joint body made by casting or cold working. A female thread 1a is formed at both ends of the pipe joint body 1, and a hole 1b is bored through the peripheral wall of the pipe joint body 1. A relatively thin synthetic resin coating layer 2 is applied to the outer peripheral surface of the pipe fitting body 1, a relatively thick synthetic resin coating layer 3 is applied to the inner peripheral surface of the pipe fitting main body 1, and The through hole 1b is filled with synthetic resin. The covering layer 2 and the covering layer 3 are connected via the synthetic resin in the through hole 1b. The outer peripheral coating layer 2 projects from both ends of the pipe joint body 1 to form a resin cylindrical portion 4. In FIG. 1, a pipe joint having such inner and outer circumferential coating layers is designated by the reference numeral 30.
ここで、外周被覆層２の厚さは0.5mm〜2.0ｍ程
度、内周被覆層３の厚さは2.0mm〜20mm程度が望
ましい。また、合成樹脂材は熱可塑性の樹脂であ
る。 Here, the thickness of the outer peripheral coating layer 2 is preferably about 0.5 mm to 2.0 m, and the thickness of the inner peripheral coating layer 3 is preferably about 2.0 mm to 20 mm. Further, the synthetic resin material is a thermoplastic resin.
このような管継手３０は次のような射出成型法
により製造することができる。第２図を参照する
に、符号１０は射出成型機の金型部であり、金型
部の基板１１には固定金型１２が固定され、基板
１１には射出成型用インジエクタのノズル１３に
対応した開孔１１ａ形成されている。固定金型１
２には、ノズル１３から射出される合成樹脂材の
注入通路１４が形成されている。一方、基板１５
には移動金型ブロツク１６が固定され、そのブロ
ツク１６にはブロツク１７が固定されている。ま
た、ブロツク１７には、射出成型の対象となる管
継手本体の外径よりも大きい内径の開口１８ａが
中央部にあけられているブロツク１８が固定され
ている。そして、ブロツク１７には、挿入金型１
９がソツケトボルト２０により取付けられてい
る。挿入金型１９は段付形状とされ、また、その
先端部は45度の角度で切断されている。挿入金型
１９の第１の段付部１９ａの外径は管継手本体１
の外径と等しく、それと連設する段付部１９ｂの
外径はねじ部１ａの内径と略等しくテーパ状であ
る。また、最先端の段付部１９ｃの外形は、その
段付部１９ｃの外周面と管継手本体の内周面との
間に所定厚さの内周被覆層３が形成されるように
決定される。挿入金型１９に管継手本体が装着さ
れたときに、ブロツク１８の開口１８ａと段付部
１９ａおよび継手本体との間に外周被覆層の厚さ
に対応した所定の間隙が形成される。ブロツク１
６の内部空間には図示しないシリンダにより駆動
されるスライダ２１が設けられていて、スライダ
２１には抜出用ピン２２が取付けられている。 Such a pipe fitting 30 can be manufactured by the following injection molding method. Referring to FIG. 2, reference numeral 10 is a mold section of an injection molding machine, a fixed mold 12 is fixed to a substrate 11 of the mold section, and the substrate 11 corresponds to a nozzle 13 of an injection molding injector. A hole 11a is formed. Fixed mold 1
2 is formed with an injection passage 14 for a synthetic resin material to be injected from a nozzle 13. On the other hand, the substrate 15
A movable mold block 16 is fixed to the movable mold block 16, and a block 17 is fixed to the block 16. Furthermore, a block 18 is fixed to the block 17 and has an opening 18a in the center thereof having an inner diameter larger than the outer diameter of the pipe joint body to be injection molded. Then, in the block 17, there is an insertion mold 1.
9 is attached by a socket bolt 20. The insertion mold 19 has a stepped shape, and its tip is cut at an angle of 45 degrees. The outer diameter of the first stepped portion 19a of the insertion mold 19 is the same as that of the pipe fitting body 1.
The outer diameter of the stepped portion 19b connected thereto is approximately equal to the inner diameter of the threaded portion 1a, and is tapered. Further, the outer shape of the stepped portion 19c at the leading edge is determined such that the inner peripheral coating layer 3 of a predetermined thickness is formed between the outer peripheral surface of the stepped portion 19c and the inner peripheral surface of the pipe fitting body. Ru. When the tube joint body is mounted on the insertion mold 19, a predetermined gap corresponding to the thickness of the outer peripheral coating layer is formed between the opening 18a of the block 18, the stepped portion 19a, and the joint body. Block 1
A slider 21 driven by a cylinder (not shown) is provided in the internal space of the slider 6, and an extraction pin 22 is attached to the slider 21.
固定金型１２、移動ブロツク１８および挿入金
型１９により画成された室には、第２図で下方か
ら移動挿入金型２３が挿通されるようになつてい
る。この挿入金型２３は段付形状とされ、また、
その先端部は45度の角度で切断されている。挿入
金型２３の基部２３ａの外径は管継手本体１の外
径と等しく、それと連設する段付部２３ｂの外径
はねじ部１ａの内径と略等しくテーパ状である。
また、最先端の段付部２３ｃの外形は、その段付
部２３ｂの外周面と管継手本体の内周面との間に
所定厚さの内周被覆層３が形成されるように決定
される。 A movable insertion mold 23 is inserted into the chamber defined by the fixed mold 12, the movable block 18, and the insertion mold 19 from below in FIG. This insertion mold 23 has a stepped shape, and
Its tip is cut at a 45 degree angle. The outer diameter of the base portion 23a of the insertion mold 23 is equal to the outer diameter of the pipe joint body 1, and the outer diameter of the stepped portion 23b connected thereto is tapered and approximately equal to the inner diameter of the threaded portion 1a.
Further, the outer shape of the stepped portion 23c at the leading edge is determined such that the inner peripheral coating layer 3 of a predetermined thickness is formed between the outer peripheral surface of the stepped portion 23b and the inner peripheral surface of the pipe fitting body. Ru.
なお、第２図において、Ａ−Ａ線は固定金型１
２と移動金型ブロツク１６〜１８から成る移動金
型５０とのパートラインを示し、そのパートライ
ンは、移動金型５０を第２図において左方向に移
動させたときの分離線となる。 In addition, in Fig. 2, the A-A line is the fixed mold 1.
2 and a movable mold 50 consisting of movable mold blocks 16 to 18, the part line becomes a separation line when the movable mold 50 is moved leftward in FIG.
次に、このような射出成型機による管継手の製
造方法について説明する。 Next, a method of manufacturing a pipe joint using such an injection molding machine will be described.
移動金型５０を左方に十分移動させるととも
に、挿入金型２３を下方に十分さげておく。そし
て、挿入金型１９に管継手本体１を装着する。管
継手本体１の周壁の所定位置には、予め貫通孔１
ｂを穿設しておく。ついで、ブロツク１８が固定
金型１２に当接するまで移動金型５０を右辺へ移
動させる。最後に、挿入金型１９の先端に当接す
るまで挿入金型２３を上昇させる。その状態が第
２図に示す状態である。 The movable mold 50 is sufficiently moved to the left, and the insertion mold 23 is sufficiently lowered downward. Then, the pipe joint body 1 is mounted on the insertion mold 19. A through hole 1 is formed in advance at a predetermined position on the peripheral wall of the pipe joint body 1.
Drill b. Next, the movable mold 50 is moved to the right side until the block 18 comes into contact with the fixed mold 12. Finally, the insertion mold 23 is raised until it comes into contact with the tip of the insertion mold 19. This state is the state shown in FIG.
射出ノズル１３から合成樹脂を射出すると、継
手本体の外周面と金型との間の間隙に合成樹脂が
注入され、次いで、貫通孔１ｂを介して挿入金型
１９および２３の段付部１９ｃ，２３ｃと継手本
体の内周面との間の間隙に合成樹脂が注入され
る。このようにして管継手本体の外周面には相対
的に薄い外周被覆層２が形成され、内周面には第
１図に示すように相対的に厚い内周被覆層３が形
成され、それら内外周被覆層は貫通孔１ｂに充填
された合成樹脂により接続される。これにより、
充填された合成樹脂が冷却固化した際に収縮が生
じても、内外周の被覆層は互いに貫通孔１ｂに充
填された合成樹脂により一体的に連結されている
ので、継手本体の表面からこれら被覆層が剥離す
るのが防止される。 When the synthetic resin is injected from the injection nozzle 13, the synthetic resin is injected into the gap between the outer circumferential surface of the joint body and the mold, and then passes through the through hole 1b to the stepped portions 19c and 23 of the insertion molds 19 and 23. Synthetic resin is injected into the gap between 23c and the inner peripheral surface of the joint body. In this way, a relatively thin outer peripheral coating layer 2 is formed on the outer peripheral surface of the pipe joint body, and a relatively thick inner peripheral coating layer 3 is formed on the inner peripheral surface as shown in FIG. The inner and outer peripheral coating layers are connected by a synthetic resin filled in the through hole 1b. This results in
Even if the filled synthetic resin shrinks when it cools and solidifies, the inner and outer peripheral coating layers are integrally connected to each other by the synthetic resin filled in the through hole 1b, so these coatings are removed from the surface of the joint body. Peeling of the layers is prevented.
なお、貫通孔１ｂの位置や数は、管継手本体の
形状、大きさあるいは内外周被覆層の厚さに応じ
て適宜選択できる。また、本実施例では、いわゆ
る「エルボ」と呼ばれる管継手を一例として説明
したが、それに限られず、真直な管継手やＴ字状
の管継手にも適用できることは勿論である。 Note that the position and number of the through holes 1b can be appropriately selected depending on the shape and size of the pipe joint body or the thickness of the inner and outer circumferential coating layers. Further, in this embodiment, a so-called "elbow" pipe joint was described as an example, but the present invention is not limited thereto, and it goes without saying that the present invention can also be applied to a straight pipe joint or a T-shaped pipe joint.
第３図を参照してこのような管継手を用いた管
接続について説明する。 Pipe connections using such a pipe joint will be explained with reference to FIG.
符号５は金属製の接続管であり、管継手３０と
同様、その雄ねじ部５ａ以外の内外周面に、熱可
塑性の合成樹脂被覆層５ｂ，５ｃが形成されてい
る。 Reference numeral 5 designates a metal connecting pipe, and like the pipe joint 30, thermoplastic synthetic resin coating layers 5b and 5c are formed on the inner and outer circumferential surfaces of the pipe other than the male threaded portion 5a.
このような管継手３０と接続管５とを接続する
に際しては、内周被覆層３の内径より大きい外径
の環状の軟質リング６を雌ねじ部１ａに遊嵌した
後に、接続管５を雌ねじ１ａに螺合する。軟質リ
ングの材質としては、軟質ウレタン、軟質塩化ビ
ニールが望ましい。接続管５をねじ込んでいく
と、軟質リング６は接続管５の雄ねじ部端面と内
周被覆層３の端部との間で押圧挟持されて符号６
−１で示すように変形し、雄ねじ５ａと螺合して
いない露出している雌ねじ１ａを完全に被覆す
る。このとき、本実施例のように、内周被覆層３
の端部３ａを、管継手外方に向つて傾斜、換言す
ると内周被覆層３の端面と雌ねじ１ａのなす角度
を鋭角にしておけば、接続管５により軟質リング
６を押圧する際に内周被覆層３に軟質リング６が
喰込み易すくなり、以つて、軟質リング６による
雌ねじ１ａの被覆が完全となる。 When connecting such a pipe fitting 30 and the connecting pipe 5, after loosely fitting the annular soft ring 6 with an outer diameter larger than the inner diameter of the inner peripheral coating layer 3 into the female threaded portion 1a, the connecting pipe 5 is connected to the female threaded portion 1a. to be screwed together. The material of the soft ring is preferably soft urethane or soft vinyl chloride. As the connecting tube 5 is screwed in, the soft ring 6 is pressed and held between the end surface of the male threaded portion of the connecting tube 5 and the end of the inner circumferential coating layer 3.
It is deformed as shown by -1, and the exposed female thread 1a that is not screwed into the male thread 5a is completely covered. At this time, as in this embodiment, the inner peripheral coating layer 3
If the end portion 3a of the pipe joint is inclined toward the outside of the pipe joint, in other words, the angle between the end face of the inner circumferential coating layer 3 and the female thread 1a is made an acute angle, when the soft ring 6 is pressed by the connecting pipe 5, the internal The soft ring 6 is easily bitten into the circumferential coating layer 3, so that the female thread 1a is completely covered by the soft ring 6.
また、接続管５を管継手３０に螺合したとき、
管継手３０の樹脂製円筒部４の端部は接続管５の
外周被覆層５ｂまで達つするようになつており、
その接ぎ目にシールテープを巻回せば、接続管５
の雄ねじ５ａをも完全に防水できる。 Moreover, when the connecting pipe 5 is screwed into the pipe joint 30,
The end of the resin cylindrical portion 4 of the pipe joint 30 is designed to reach the outer peripheral coating layer 5b of the connecting pipe 5,
If you wrap sealing tape around the joint, connecting pipe 5
Even the male screw 5a can be completely waterproofed.
（発明の効果）
本発明によれば、管継手本体の外周被覆層と内
周被覆層が貫通孔に充填された合成樹脂により接
続されたので内周被覆層の剥離が防止される。ま
た、射出成型により内外周被覆層を一体に形成す
るようにしたので、金型の寸法を適宜選択するこ
とにより被覆層の厚さを所望の値にでき、これに
より、比較的厚い内周被覆層を得ることができ
る。(Effects of the Invention) According to the present invention, since the outer circumferential coating layer and the inner circumferential coating layer of the pipe joint body are connected by the synthetic resin filled in the through hole, peeling of the inner circumferential coating layer is prevented. In addition, since the inner and outer circumferential coating layers are integrally formed by injection molding, the thickness of the coating layer can be set to a desired value by appropriately selecting the dimensions of the mold, which allows for a relatively thick inner circumferential coating. You can get layers.
また、本発明方法によれば、射出成型により内
外周被覆層を形成するようにしたので、被覆層の
厚さを一度の射出成型で比較的厚く任意に設定で
きる。 Further, according to the method of the present invention, since the inner and outer peripheral coating layers are formed by injection molding, the thickness of the coating layer can be arbitrarily set to be relatively thick by one injection molding.
第１図は内外周面を合成樹脂により被覆した管
継手の一例を示す縦断面図、第２図はその管継手
を製造するための射出成型機の一実施例を示す縦
断面図、第３図は本発明管継手の接続構造を示す
縦断面図である。
１……管継手本体、１ｂ……貫通孔、２……外
周被覆層、３……内周被覆層、５……接続管、１
０……射出成型機金型、１２……固定金型、１３
……射出ノズル、１９，２０……挿入金型、３０
……管継手。
Fig. 1 is a longitudinal cross-sectional view showing an example of a pipe fitting whose inner and outer peripheral surfaces are coated with synthetic resin, Fig. 2 is a longitudinal cross-sectional view showing an example of an injection molding machine for manufacturing the pipe fitting, and Fig. 3 is a longitudinal cross-sectional view showing an example of an injection molding machine for manufacturing the pipe fitting. The figure is a longitudinal sectional view showing the connection structure of the pipe joint of the present invention. DESCRIPTION OF SYMBOLS 1...Pipe joint body, 1b...Through hole, 2...Outer periphery coating layer, 3...Inner periphery coating layer, 5...Connecting pipe, 1
0...Injection molding machine mold, 12...Fixed mold, 13
... Injection nozzle, 19, 20 ... Insertion mold, 30
...Pipe fitting.
Claims (1)
手において、管継手本体に該管継手の内外周を貫
通する少なくとも一つの貫通孔が形成され、管継
手本体の外周面と前記雌ねじ部を除く内周面とに
合成樹脂被覆層が被着され、両被覆層が前記貫通
孔に充填された合成樹脂を介して互いに一体的に
連続している管継手。 ２ 少なくとも一端に雌ねじ部が形成された管継
手本体に予めその内外周を貫通する少なくとも一
つの貫通孔を穿設し、射出成型金型に該管継手本
体および移動型体を挿入設置して管継手本体の雌
ねじ部を除く内周面および外周面に間隙を画成
し、前記射出成型金型に前記外周面の間隙に臨む
ように設けられた射出注入通路から溶融合成樹脂
材を前記外周面の間隙に充填した後、該合成樹脂
材を前記貫通孔を介して前記内周面の間隙に充填
し、前記貫通孔に充填された合成樹脂を介して一
体的に連続する被覆層を管継手本体の内外周面に
被覆する管継手の製造方法。[Scope of Claims] 1. In a pipe fitting in which a female thread is formed at at least one end, at least one through hole passing through the inner and outer peripheries of the pipe fitting body is formed, and the outer circumferential surface of the pipe fitting body and the A pipe joint in which a synthetic resin coating layer is adhered to the inner circumferential surface except for the female threaded portion, and both coating layers are integrally continuous with each other via the synthetic resin filled in the through hole. 2. At least one through hole penetrating the inner and outer periphery of the pipe fitting main body, which has a female thread formed at at least one end, is drilled in advance, and the pipe fitting main body and movable mold body are inserted into an injection mold and installed. A gap is defined between the inner circumferential surface and the outer circumferential surface of the joint body excluding the female threaded portion, and the molten synthetic resin material is applied to the outer circumferential surface from an injection injection passage provided in the injection mold so as to face the gap between the outer circumferential surfaces. After filling the gap, the synthetic resin material is filled into the gap on the inner circumferential surface through the through hole, and an integrally continuous coating layer is formed into a pipe joint through the synthetic resin filled in the through hole. A method of manufacturing a pipe joint that coats the inner and outer peripheral surfaces of the main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60089512A JPS61248990A (en) | 1985-04-25 | 1985-04-25 | Pipe joint and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60089512A JPS61248990A (en) | 1985-04-25 | 1985-04-25 | Pipe joint and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61248990A JPS61248990A (en) | 1986-11-06 |
| JPH0217757B2 true JPH0217757B2 (en) | 1990-04-23 |
Family
ID=13972834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60089512A Granted JPS61248990A (en) | 1985-04-25 | 1985-04-25 | Pipe joint and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61248990A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0618133Y2 (en) * | 1987-02-27 | 1994-05-11 | 日本鋼管継手株式会社 | Pipe end anti-corrosion joint |
| JPS6425596U (en) * | 1987-08-06 | 1989-02-13 | ||
| JPH01165879U (en) * | 1988-05-16 | 1989-11-20 | ||
| JP5160313B2 (en) * | 2008-06-06 | 2013-03-13 | トヨタ紡織株式会社 | Cylinder head cover |
| JP2019168102A (en) * | 2018-03-26 | 2019-10-03 | 小澤物産株式会社 | Coupling structure and resin lining formation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57188331A (en) * | 1981-05-15 | 1982-11-19 | Sekisui Chem Co Ltd | Manufacture of tube joint for inside coated steel tube |
| JPS6047982B2 (en) * | 1978-05-19 | 1985-10-24 | 松下電器産業株式会社 | How to manufacture a temperature sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047982U (en) * | 1983-09-09 | 1985-04-04 | 三菱樹脂株式会社 | Internal and external anti-corrosion joints |
-
1985
- 1985-04-25 JP JP60089512A patent/JPS61248990A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047982B2 (en) * | 1978-05-19 | 1985-10-24 | 松下電器産業株式会社 | How to manufacture a temperature sensor |
| JPS57188331A (en) * | 1981-05-15 | 1982-11-19 | Sekisui Chem Co Ltd | Manufacture of tube joint for inside coated steel tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61248990A (en) | 1986-11-06 |
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