JPH09152069A - Mechanical joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply connect together steel pipes without using an exclusive tool by providing rubber packings forming projecting parts for contacting with steel pipes on the inner circumferential faces, and nuts forming taper thread on the inner circumferential faces to be threadedly engaged with the thread of a joint main body. SOLUTION: Before connection of a steel pipe P, the projecting part 13a of a rubber packing 13 maintains the form before deformation in which the projecting quantity becomes gradually larger following to approaching the center from the end side of a joint main body 12. For connecting the steel pipe P, the end part of the steel pipe P is inserted into the mechanical joint 11, and the a nut 14 is threadedly fastened. Under this condition, the projecting part 13a of the rubber packing 13 is pushed with the end face of the steel pipe P so as to fall down on the center part of the joint main body 12, and finally closely contacted with the outer circumferential face of the steel pipe P so as to hold airtightness. The end part of the joint main body 12 is pushed on the inner circumferential face side, and thread 12a' is bitten in the outer circumferential face of the steel pipe P by the action of slits 12d' so as to prevent slipping-off.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、例えば大径鋼管を
接続するのに適したメカニカル継手に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical joint suitable for connecting, for example, a large diameter steel pipe.

【０００２】[0002]

【従来の技術】従来より鋼管を接続する管継手には種々
のタイプのものがあるが、特に、シール表面が部材によ
って圧接される管継手は、多種多用な構造のものが提案
されている。例えば、図２に示すような、内面にテーパ
をもつねじを刻設したスリーブ１を管２に食い込ませて
管端を形成し、継手本体３に対し、ナット４を介して管
端を結合するもの（実公昭５０−２５７５号）や、図３
に示すような、テーパ面５ａ，５ａ’をもつ筒体５，
５’に、お互いに逆ねじ５ｂ，５ｂ’を設け、これらを
同じく一組の逆ねじをもつナット６により同時に締めつ
け、ボール７，パッキング８により管２と継手を結合す
るもの（特公昭４５−５３０５号）等である。2. Description of the Related Art Conventionally, there are various types of pipe joints for connecting steel pipes, and in particular, pipe joints whose seal surfaces are pressed against each other by members are proposed to have various structures. For example, as shown in FIG. 2, a sleeve 1 in which a screw having a taper is engraved on the inner surface is bited into a pipe 2 to form a pipe end, and the pipe end is coupled to a joint body 3 via a nut 4. Things (Jitsuko Sho 25-2575) and Fig. 3
As shown in Fig. 5, the cylindrical body 5 having the tapered surfaces 5a, 5a '
5'is provided with reverse screws 5b and 5b ', which are simultaneously tightened by a nut 6 also having a set of reverse screws, and the pipe 2 and the joint are connected by a ball 7 and a packing 8 (Japanese Patent Publication No. No. 5305).

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、これら
従来より提案され、実用化されている管継手は、専用
の工具を使用しなければ接続できなかったり、寸法取
りが困難であったり、接続すべき管に溝切り等の加工
を行う必要がある、というような問題があった。However, these conventional pipe joints that have been proposed and put into practical use cannot be connected unless a dedicated tool is used, or it is difficult to dimension them, and they should be connected. There was a problem that it was necessary to perform processing such as groove cutting on the pipe.

【０００４】本発明は、上記した従来の問題点を全て解
決し、かつ、コンパクトなメカニカル継手を提供するこ
とを目的としている。An object of the present invention is to solve all the above-mentioned conventional problems and to provide a compact mechanical joint.

【０００５】[0005]

【課題を解決するための手段】上記した目的を達成する
ために、本発明のメカニカル継手は、両端部に放射状の
スリットを所要長さ設けるとともに、内周面両端部には
接続せんとする鋼管への食い込み歯を、また外周面両端
部にはねじを形成し、さらに、これら両端部よりそれぞ
れ中央部寄りの内周面に後述するゴムパッキンの嵌入溝
を設けた継手本体と、この継手本体内における前記嵌入
溝にそれぞれ挿入され、その内周面に鋼管との当接用突
出部を形成したゴムパッキンと、継手本体の前記ねじに
螺合するテーパねじをその内周面に形成したナットを備
えた構成としているのである。In order to achieve the above-mentioned object, a mechanical joint of the present invention is a steel pipe which has radial slits at both ends and has a required length and is connected to both ends of the inner peripheral surface. A joint main body having biting teeth into the outer peripheral surface and threads formed on both end portions of the outer peripheral surface, and further provided with a groove for inserting a rubber packing described later on the inner peripheral surface closer to the central portion from the both end portions, and the joint main body. A rubber packing that is inserted into each of the fitting grooves inside and that has a protrusion for abutting against a steel pipe formed on the inner peripheral surface thereof, and a taper screw that is screwed into the screw of the joint body is formed on the inner peripheral surface of the nut. It has a configuration that includes.

【０００６】[0006]

【発明の実施の形態】本発明のメカニカル継手は、継手
本体を、両端部に放射状のスリットを所要長さ設けると
ともに、内周面両端部には接続せんとする鋼管への食い
込み歯を、また外周面両端部には例えば平行ねじを形成
し、さらに、これら両端部よりそれぞれ中央部寄りの内
周面に後述するゴムパッキンの嵌入溝を設けた構成とな
し、この継手本体内の前記嵌入溝に、その内周面に鋼管
との当接用突出部を形成したゴムパッキンをそれぞれ挿
入し、また、継手本体の前記平行ねじに、これに螺合す
るテーパねじをその内周面に形成するとともに、反継手
本体側に放射状のスリットを形成したナットを螺合させ
ている。BEST MODE FOR CARRYING OUT THE INVENTION A mechanical joint according to the present invention comprises a joint body having radial slits at both ends, and a biting tooth into a steel pipe to be connected to both ends of the inner peripheral surface. For example, parallel threads are formed at both ends of the outer peripheral surface, and further, a fitting groove for a rubber packing, which will be described later, is provided on the inner peripheral surface nearer to the central portion from the both end portions. To the parallel threads of the joint body, and a taper screw to be screwed to the parallel thread of the joint body is formed on the inner peripheral surface of the rubber packing. At the same time, a nut having a radial slit formed on the side opposite to the joint body is screwed.

【０００７】[0007]

【実施例】以下、本発明のメカニカル継手を図１に示す
一実施例に基づいて説明する。図１（ａ）は本発明のメ
カニカル継手の一実施例を示す半断面図で、その右側は
鋼管をセットした状態を、また左側はセット前の状態を
示し、（ｂ）はナットの右側面を半分だけ示した図であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS A mechanical joint of the present invention will be described below based on an embodiment shown in FIG. FIG. 1 (a) is a half sectional view showing an embodiment of a mechanical joint of the present invention, the right side shows a state where a steel pipe is set, the left side shows a state before setting, and (b) shows the right side surface of the nut. It is the figure which showed only half.

【０００８】図１において、１１は本発明のメカニカル
継手であり、継手本体１２と、この継手本体１２に挿入
されるゴムパッキン１３と、前記継手本体１２の両端部
に螺合するナット１４で構成される。In FIG. 1, 11 is a mechanical joint of the present invention, which comprises a joint body 12, a rubber packing 13 inserted into the joint body 12, and nuts 14 screwed to both ends of the joint body 12. To be done.

【０００９】継手本体１２は、例えば黒心可鍛鋳鉄や球
状黒鉛鋳鉄で製作され、その両端部には放射状のスリッ
ト１２ｄ，１２ｄ’が所要長さ設けられているととも
に、その内周面両端部には、接続時、鋼管Ｐの外周面に
食い込む食い込み歯、例えばねじ１２ａ，１２ａ’を、
また、外周面両端部には平行ねじ１２ｂ，１２ｂ’を形
成し、さらに、これら両端部より中央部寄りの内周面
に、ゴムパッキン１３の嵌入溝１２ｃ，１２ｃ’を設け
た構成である。The joint body 12 is made of, for example, black-core malleable cast iron or spheroidal graphite cast iron. Radial slits 12d, 12d 'are provided at both ends of the joint body 12 and both ends of the inner peripheral surface thereof are provided. At the time of connection, there are biting teeth, such as screws 12a and 12a ', which bite into the outer peripheral surface of the steel pipe P.
In addition, parallel threads 12b and 12b 'are formed on both ends of the outer peripheral surface, and fitting grooves 12c and 12c' of the rubber packing 13 are provided on the inner peripheral surface closer to the central portion than the both ends.

【００１０】また、ゴムパッキン１３はリング形状をな
し、継手本体１２の前記嵌入溝１２ｃ，１２ｃ’に挿入
され、その内周面に鋼管Ｐの外周面に当接する当接用突
出部１３ａを有した構成である。本実施例では、継手本
体１２内への鋼管Ｐの挿入を容易にするため、前記突出
部１３ａは、継手本体１２の両端側より中央にゆくほど
徐々に突出量が大きくなるものを示しているが、このよ
うな形状に限るものではない。The rubber packing 13 has a ring shape, is inserted into the fitting grooves 12c, 12c 'of the joint body 12, and has an abutting protrusion 13a on its inner peripheral surface for abutting the outer peripheral surface of the steel pipe P. It is a configuration. In this embodiment, in order to facilitate the insertion of the steel pipe P into the joint body 12, the protrusions 13a have a gradually increasing protrusion amount from the both ends of the joint body 12 toward the center. However, the shape is not limited to this.

【００１１】また、ナット１４は、例えば球状黒鉛鋳鉄
で製作され、その内周面に、継手本体１２の前記平行ね
じ１２ｂ，１２ｂ’に螺合するテーパねじ１４ａを刻設
し、螺締めによって継手本体１２の両端部を内側に押圧
し、ねじ１２ａ，１２ａ’を鋼管Ｐに食い込ませて抜け
止めを図るものである。本実施例では、このナット１４
の反継手本体側にも、放射状のスリット１４ｂを所要長
さ設けたものを示している。The nut 14 is made of, for example, spheroidal graphite cast iron, and the inner peripheral surface of the nut 14 is provided with a taper screw 14a which is screwed into the parallel threads 12b and 12b 'of the joint body 12 and is screwed into the joint. Both ends of the main body 12 are pressed inward, and the screws 12a and 12a 'are bitten into the steel pipe P to prevent the screws from coming off. In this embodiment, the nut 14
The non-joint main body side is also provided with radial slits 14b having a required length.

【００１２】本発明のメカニカル継手１１は上記したよ
うな構成であり、このメカニカル継手１１を用いて鋼管
Ｐを接続する場合には、以下のように行う。まず、鋼管
Ｐの接続前は、図１（ａ）の左半分に示すように、ゴム
パッキン１３の突出部１３ａは、継手本体１２の両端側
より中央にゆくほど徐々に突出量が大きな、変形前の形
状を維持している。The mechanical joint 11 of the present invention has the above-mentioned structure. When the steel pipe P is connected using the mechanical joint 11, the following process is performed. First, before connecting the steel pipe P, as shown in the left half of FIG. 1A, the protruding portion 13a of the rubber packing 13 has a protruding amount that gradually increases from the both ends of the joint body 12 toward the center. It retains its previous shape.

【００１３】そして、鋼管Ｐを接続するに際しては、前
記したような状態のメカニカル継手１１に鋼管Ｐの端部
を挿入し、その後、ナット１４を螺締めするだけで接続
は完了する。When connecting the steel pipe P, the connection is completed simply by inserting the end of the steel pipe P into the mechanical joint 11 in the above-described state and then screwing the nut 14 into the screw.

【００１４】この接続状態にあっては、ゴムパッキン１
３の突出部１３ａが鋼管Ｐの端面に押されて、継手本体
１２の中央側に倒れ、最終的には図１（ａ）の右半分に
示すように、鋼管Ｐの外周面に密着し、気密を保持する
とともに、継手本体１２の端部は、ナット１４のテーパ
ねじ１４ａの作用で内周面側に押され、スリット１２
ｄ，１２ｄ’の作用でねじ１２ａ，１２ａ’が鋼管Ｐの
外周面に食い込んで抜けが防止される。In this connected state, the rubber packing 1
The protruding portion 13a of No. 3 is pushed by the end surface of the steel pipe P, falls to the center side of the joint body 12, and finally contacts the outer peripheral surface of the steel pipe P, as shown in the right half of FIG. While maintaining airtightness, the end of the joint body 12 is pushed toward the inner peripheral surface side by the action of the taper screw 14a of the nut 14, and the slit 12
By the action of d and 12d ', the screws 12a and 12a' bite into the outer peripheral surface of the steel pipe P to prevent the screws from coming off.

【００１５】なお、本実施例では継手本体１２の外周面
両端部に刻設した平行ねじ１２ｂ，１２ｂ’に、ナット
１４のテーパねじ１４ａを螺合させ、継手本体１２の両
端部を内面側に押圧するため、ナット１４の反継手本体
側に放射状のスリット１４ｂを所要長さ設け、必要以上
の荷重が作用した場合にナット１４の反継手本体側が外
面側に逃げるものを開示しているが、継手本体１２の外
周面両端部に、平行ねじ１２ｂ，１２ｂ’に代えてテー
パねじを刻設する場合にはナット１４のスリット１４ｂ
は不要である。In this embodiment, the taper screw 14a of the nut 14 is screwed into the parallel threads 12b and 12b 'formed on both ends of the outer peripheral surface of the joint body 12 so that both end portions of the joint body 12 face inward. In order to press, a radial slit 14b is provided on the non-joint body side of the nut 14 for a required length, and when the load more than necessary acts, the non-joint body side of the nut 14 escapes to the outer surface side. When taper screws are formed on both ends of the outer peripheral surface of the joint body 12 instead of the parallel screws 12b and 12b ', the slit 14b of the nut 14 is formed.
Is unnecessary.

【００１６】[0016]

【発明の効果】以上説明したように、本発明のメカニカ
ル継手は構成したので、専用の工具を使用することな
く、しかも、接続すべき管に溝切り等の加工を行う必要
もなく、簡単に接続が行えるとともに、接続時における
寸法取りも容易に行えるという効果がある。さらに、本
発明のメカニカル継手は、構造が簡単なので、コンパク
トに形成できるという効果もある。As described above, since the mechanical joint of the present invention is constructed, it is easy to use without using a dedicated tool, and without needing to perform groove cutting or the like on the pipe to be connected. There is an effect that connection can be performed and dimensioning can be easily performed at the time of connection. Further, the mechanical joint of the present invention has a simple structure, so that it can be compactly formed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】（ａ）は本発明のメカニカル継手の一実施例を
示す半断面図で、その右側は鋼管をセットした状態を、
また左側はセット前の状態を示し、（ｂ）はナットの右
側面を半分だけ示した図である。FIG. 1 (a) is a half sectional view showing an embodiment of a mechanical joint of the present invention, the right side of which shows a state in which a steel pipe is set,
The left side shows the state before setting, and (b) is a view showing only the right side surface of the nut in half.

【図２】実公昭５０−２５７５号の管継手の説明図であ
る。FIG. 2 is an explanatory view of a pipe joint of Japanese Utility Model Publication No. 50-2575.

【図３】特公昭４５−５３０５号の管継手の説明図であ
る。FIG. 3 is an explanatory view of a pipe joint of Japanese Patent Publication No. 45-5305.

【符号の説明】[Explanation of symbols]

１１ メカニカル継手 １２ 継手本体 １２ａ ねじ １２ａ’ ねじ １２ｂ 平行ねじ １２ｂ’ 平行ねじ １２ｃ 嵌入溝 １２ｃ’ 嵌入溝 １２ｄ スリット １２ｄ’ スリット １３ ゴムパッキン １３ａ 突出部 １４ ナット １４ａ テーパねじ 11 Mechanical Joint 12 Joint Body 12a Screw 12a 'Screw 12b Parallel Screw 12b' Parallel Screw 12c Fitting Groove 12c 'Fitting Groove 12d Slit 12d' Slit 13 Rubber Packing 13a Projection 14 Nut 14a Tapered Screw

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 両端部に放射状のスリットを所要長さ設
けるとともに、内周面両端部には接続せんとする鋼管へ
の食い込み歯を、また外周面両端部にはねじを形成し、
さらに、これら両端部よりそれぞれ中央部寄りの内周面
に後述するゴムパッキンの嵌入溝を設けた継手本体と、
この継手本体内における前記嵌入溝にそれぞれ挿入さ
れ、その内周面に鋼管との当接用突出部を形成したゴム
パッキンと、継手本体の前記ねじに螺合するテーパねじ
をその内周面に形成したナットを備えたことを特徴とす
るメカニカル継手。1. A radial slit is formed at a required length on both ends, and a bite into a steel pipe to be connected is formed on both ends of the inner peripheral surface, and a screw is formed on both ends of the outer peripheral surface.
Further, a joint main body having a fitting groove for a rubber packing described later on the inner peripheral surface nearer to the central portion from these both ends,
A rubber packing, which is inserted into each of the fitting grooves in the joint main body and has a protrusion for contacting a steel pipe on the inner peripheral surface thereof, and a taper screw which is screwed to the screw of the joint main body are formed on the inner peripheral surface thereof. A mechanical joint characterized by having a formed nut.