JPH0212383Y2

JPH0212383Y2 -

Info

Publication number: JPH0212383Y2
Application number: JP10233685U
Authority: JP
Priority date: 1985-07-04
Filing date: 1985-07-04
Publication date: 1990-04-06
Also published as: JPS629784U

Description

[Detailed explanation of the idea]

（産業上の利用分野）本考案はくい込み式の管継手に関する。（従来の技術）従来、くい込み式の管継手として実公昭56−
18767号公報に示された考案が知られている。この考案は、筒状の継手本体の内周面に、この
継手本体端部から内方に向かつて大径となるテー
パを有する第１の環状溝を刻設し、この第１の環
状溝に、外周面を上記テーパに合致するテーパ面
とし内周面をその外周面と逆テーパにした管締付
用割りリングを嵌挿するとともに、上記第１の環
状溝の継手本体内方端部に、その第１の環状溝と
連通する第２の環状溝を刻設し、この第２の環状
溝内に、上記割りリングに当接しその割りリング
を継手本体の開口端部側に弾性的に押圧する突起
を有する弾性ガスケツトを嵌着したものである。（考案が解決しようとする問題点）ところが管継手をセツトした場合、第１の環状
溝に形成されたテーパ面の延長線上の交点と割り
リングの外周面に形成されたテーパ面の延長線上
の交点が継手本体の中心軸線上あるいは該中心軸
線と平行な同一線上に位置している。従つて、管
の抜け出し力を管軸に対して直角な力のみで防止
することになり、管に対して曲げ力が作用しない
ので、接続した管の逸脱防止機能に確実性がない
という問題があつた。（問題点を解決するための手段）本考案は係る管継手は、筒状の継手本体の両端
内周面にそれぞれ環状弾性体を装着する第１の環
状溝が形成され、これら第１の環状溝のよりも内
方における継手本体の内周面にそれぞれ管締付用
割りリングを嵌入する第２の環状溝が形成され、
第１の環状溝と第２の環状溝との間に設けられた
突堤の内周面に継手本体の開口端部から内方に向
かつて大径となるテーパ面が形成されるととも
に、該テーパ面と接する前記割りリングの外周面
にテーパ面が形成され、これら両テーパ面は、一
方のテーパ面の交点が継手本体の中心軸線上ある
いは該中心軸線と平行な線上に位置していると、
他方のテーパ面の交点がこの線上から外れるよう
に形成されたものである。（作用）管に高い水圧が負荷されると、突堤に形成され
たテーパ面と管締付用割りリングに形成されたテ
ーパ面の偏心等の関係で、割りリングが偏形し、
接続された管に抜け出し力が作用すると、割りリ
ングは突堤のテーパ面に押しつけられて管外面を
締め付ける。管に対する抜け出し力は管に対して
曲げ力として作用し、割りリングが管の外周面を
より強く締め付けて管の抜け止め効果を確実にす
る。又、割りリングよりも開口端側に設けた第１
の環状溝内の環状弾性体により充分な水密性を確
保する。（実施例）本考案に係る管継手の実施例を第１図ないし第
７図に示している。筒状の継手本体１の両開口端部内周面にそれぞ
れ環状弾性体２を装着する第１の環状溝３，３が
形成されるとともに、これら第１の環状溝３，３
よりも内方における継手本体１の内周面にそれぞ
れ管締付用割りリング５を嵌入する第２の環状溝
６，６が形成され、かつ、継手本体１の内周面中
央に突条９が周方向に形成されている。該突条９
は管１０が必要以上に継手本体１内に挿入される
のを防止するストツパの役目をするものである。
第１の環状溝３と第２の環状溝６との間に、割り
リング５の抜け出しを防止するとともに割りリン
グ５に管軸に対する傾きを与える突堤７が形成さ
れ、該突堤７の内周面に、継手本体１の開口端部
から内方に向かつて大径となるテーパ面８が形成
されている。割りリング５の内周面には複数条の
突起５ａが周方向に形成されている。各突起５ａ
は割りリング５に挿入した管１０の外周面にくい
込むための鋭利な刃先を有するものである。割り
リング５は該刃先が継手本体１の内方へ向くよう
に第２の環状溝６の内部に嵌入せられる。また、
突堤７に形成されたテーパ面８と接する割りリン
グ５の外周面にテーパ面５ｂが形成されている。
割りリング５の内径寸法Ｄは挿入される管１０の
外径寸法よりもわずかに小さくなされており、管
１０の外径寸法の変化に対応し得るように割り部
５ｃが形成されている。割りリング５の材質とし
ては、挿入される管１０よりも硬く、拡径、縮径
が可能な弾性を有することが必要である。次に、突堤７に形成されたテーパ面８と割りリ
ング５に形成されたテーパ面５ｂの関係について
説明する。テーパ面５ｂを延長することによつて
生ずる交点をFa、テーパ面８を延長することに
よつて生ずる交点をFbとする。テーパ面５ｂと
８は、割りリング５が第２の環状溝６内に嵌入せ
られたとき、一方の交点FaもしくはFbが継手本
体１の中心軸線Ｘ−X′上あるいは該中心軸線と
平行な線（図示省略）上に位置していると、他方
の交点FbもしくはFaがこの線上から外れるよう
に形成されている（第４図、第５図および第６図
参照）。このように交点Fa，Fbがそれぞれ同一の
軸線上に位置しないようにすることにより、管に
対する軸線方向の抜け出し力が、管に対して曲げ
力として変換されて作用することになり、その結
果、抜け出し力が阻止される。交点FaとFbの位
置関係を上記のように成すため、第４図Ｂに示す
実施例ではテーパ面８を角度θ₃では傾斜させ、第
５図に示す実施例ではテーパ面８を偏心、第６図
に示す実施例では割りリング５のテーパ面５ｂを
偏心させている。上記いずれかの場合においても、テーパ面５ｂ
の角度θ₁とテーパ面８の角度θ₂の関係は、θ₁≧θ₂
であることが必要である。また、角度θ₁は10度＜
θ₁＜80度の範囲であることが好ましく、角度θ₂は
10度＜θ₂＜70度の範囲であることが好ましい。なお、継手本体１は一体構造が好ましいが、第
７図に示すように、分割構造としてもよい。第１表は、テーパ面５ｂの角度θ₁、テーパ面８
の角度θ₂及びテーパ面８の傾斜角度θ₃を変化させ
た場合の管逸脱防止性能を内水圧試験により評価
して結果を示すものである。 (Field of Industrial Application) The present invention relates to a bite-type pipe joint. (Conventional technology) Conventionally, it was used as a bite-type pipe fitting.
A device disclosed in Publication No. 18767 is known. This invention involves carving a first annular groove on the inner circumferential surface of a cylindrical joint body, the first annular groove tapering inward from the end of the joint body to a larger diameter. , a split ring for pipe tightening having an outer circumferential surface tapered to match the above-mentioned taper and an inner circumferential surface tapered inversely to the outer circumferential surface is inserted, and a split ring for pipe tightening is inserted into the inner end of the joint body of the first annular groove. , a second annular groove communicating with the first annular groove is carved, and in this second annular groove, the split ring is brought into contact with the split ring and elastically pushed toward the open end side of the joint body. It is fitted with an elastic gasket having a pressing projection. (Problem to be solved by the invention) However, when the pipe joint is set, the intersection point on the extended line of the tapered surface formed in the first annular groove and the extended line of the tapered surface formed on the outer peripheral surface of the split ring. The intersection point is located on the central axis of the joint body or on the same line parallel to the central axis. Therefore, the pull-out force of the tube is prevented only by a force perpendicular to the tube axis, and no bending force is applied to the tube, so there is a problem that the disconnection prevention function of the connected tube is not reliable. It was hot. (Means for Solving the Problems) The present invention provides a pipe joint in which first annular grooves are formed on the inner circumferential surface of both ends of a cylindrical joint body, in which annular elastic bodies are respectively attached, and these first annular grooves A second annular groove into which the pipe tightening split ring is fitted is formed on the inner circumferential surface of the joint body on the inner side of the groove,
A tapered surface that becomes larger in diameter inward from the open end of the joint body is formed on the inner circumferential surface of the jetty provided between the first annular groove and the second annular groove, and the taper A tapered surface is formed on the outer peripheral surface of the split ring that is in contact with the surface, and the intersection of one of the tapered surfaces is located on the central axis of the joint body or on a line parallel to the central axis,
The other tapered surface is formed so that the intersection point is off from this line. (Function) When high water pressure is applied to the pipe, the split ring becomes deformed due to the eccentricity of the tapered surface formed on the jetty and the tapered surface formed on the pipe tightening split ring.
When a pull-out force is applied to the connected pipe, the split ring is pressed against the tapered surface of the jetty and tightens the outer surface of the pipe. The pull-out force on the tube acts as a bending force on the tube, and the split ring tightens the outer circumferential surface of the tube more firmly to ensure the effect of preventing the tube from coming off. In addition, the first
The annular elastic body in the annular groove ensures sufficient watertightness. (Example) Examples of the pipe joint according to the present invention are shown in FIGS. 1 to 7. First annular grooves 3, 3, into which the annular elastic body 2 is attached, are formed on the inner circumferential surface of both open ends of the cylindrical joint body 1, and these first annular grooves 3, 3
Second annular grooves 6, 6 into which the pipe tightening split rings 5 are fitted are formed on the inner circumferential surface of the joint body 1 on the inner side thereof, and a protrusion 9 is formed at the center of the inner circumferential surface of the joint body 1. is formed in the circumferential direction. The protrusion 9
serves as a stopper to prevent the pipe 10 from being inserted into the joint body 1 more than necessary.
A jetty 7 is formed between the first annular groove 3 and the second annular groove 6 to prevent the split ring 5 from coming off and to tilt the split ring 5 with respect to the tube axis. A tapered surface 8 whose diameter increases inwardly from the open end of the joint body 1 is formed. A plurality of protrusions 5a are formed on the inner peripheral surface of the split ring 5 in the circumferential direction. Each protrusion 5a
has a sharp cutting edge for biting into the outer peripheral surface of the tube 10 inserted into the split ring 5. The split ring 5 is fitted into the second annular groove 6 so that its cutting edge faces inward of the joint body 1. Also,
A tapered surface 5b is formed on the outer peripheral surface of the split ring 5 that is in contact with a tapered surface 8 formed on the jetty 7.
The inner diameter D of the split ring 5 is made slightly smaller than the outer diameter of the tube 10 into which it is inserted, and the split portion 5c is formed to accommodate changes in the outer diameter of the tube 10. The material of the split ring 5 needs to be harder than the tube 10 into which it is inserted and have elasticity that allows it to expand and contract in diameter. Next, the relationship between the tapered surface 8 formed on the jetty 7 and the tapered surface 5b formed on the split ring 5 will be explained. Let Fa be the intersection point caused by extending the tapered surface 5b, and Fb be the intersection point caused by extending the tapered surface 8. When the split ring 5 is inserted into the second annular groove 6, the tapered surfaces 5b and 8 have one intersection point Fa or Fb on the central axis X-X' of the joint body 1 or parallel to the central axis. When located on a line (not shown), the other intersection point Fb or Fa is formed to be off the line (see FIGS. 4, 5, and 6). By making sure that the intersection points Fa and Fb are not located on the same axis, the pull-out force in the axial direction on the tube is converted into a bending force and acts on the tube, and as a result, The ability to escape is blocked. In order to establish the positional relationship between the intersection points Fa and Fb as described above, in the embodiment shown in FIG. 4B, the tapered surface 8 is inclined at an angle θ ₃ , and in the embodiment shown in FIG. In the embodiment shown in FIG. 6, the tapered surface 5b of the split ring 5 is eccentric. In any of the above cases, the tapered surface 5b
The relationship between the angle θ ₁ and the angle θ ₂ of the tapered surface 8 is θ ₁ ≧ θ ₂
It is necessary that Also, the angle θ ₁ is 10 degrees <
It is preferable that θ ₁ <80 degrees, and the angle θ ₂ is
Preferably, the range is 10 degrees < θ ₂ <70 degrees. Although the joint body 1 preferably has an integral structure, it may have a divided structure as shown in FIG. Table 1 shows the angle θ ₁ of the tapered surface 5b, the tapered surface 8
The pipe deviation prevention performance was evaluated by an internal water pressure test when the angle θ ₂ of the tapered surface 8 and the inclination angle θ ₃ of the tapered surface 8 were varied, and the results are shown below.

【表】この表で判るように、θ₃＝０の場合、20Kg／cm²
以下の管水圧で管１０が抜ける場合がある。しか
しながら、θ₃として傾斜角度を設け管軸に対する
割りリング５の当りを偏らせると、管逸脱防止性
能が著しく向上する。（考案の効果）高水圧が負荷されて管に大きな抜け出し力が付
与されても、管締付用割りリングが偏形して管外
周面を締め付け、管に対する軸線方向の抜け出し
力が、管に対して曲げ力として変換されて作用す
ることにより、確実な逸脱防止効果が得られる。
また、環状弾性体を管締付用割りリングよりも開
口端側に配設したので、管挿入時に割りリングに
よつて管の外周面が傷つけられていたとしても高
いシール効果が得られる。[Table] As you can see from this table, when θ ₃ = 0, 20Kg/cm ²
The pipe 10 may come off at the following pipe water pressure. However, if an inclination angle is set as θ ₃ to bias the contact of the split ring 5 against the tube axis, the tube deviation prevention performance is significantly improved. (Effect of the invention) Even if a large pull-out force is applied to the pipe due to high water pressure, the pipe tightening split ring is deformed and tightens the outer circumferential surface of the pipe, and the pull-out force in the axial direction against the pipe is applied to the pipe. By converting it into a bending force and acting on it, a reliable deviation prevention effect can be obtained.
Further, since the annular elastic body is disposed closer to the open end than the split ring for tightening the pipe, a high sealing effect can be obtained even if the outer peripheral surface of the pipe is damaged by the split ring when the pipe is inserted.

[Brief explanation of the drawing]

図面は本考案の管継手の実施例を示し、第１図
は管継手の縦断面図、第２図は水圧によつて矢印
方向に抜け出し力が働いた状態を示す管継手の縦
断面図、第３図は割りリングの正面図、第４図Ａ
は割りリングの縦断面図、第４図Ｂは第２の環状
溝を示す縦断面図、第５図及び第６図は割りリン
グのテーパ面の交点位置および突堤のテーパ面の
交点位置あるいはこれらのテーパ面の形状を示す
縦断面図、第７図は分割形体とした継手本体の縦
断面図である。１……継手本体、２……環状弾性体、３……第
１の環状溝、５……割りリング、５ａ……突起、
５ｂ……テーパ面、６……第２の環状溝、７……
突堤、８……テーパ面、１０……管、Fa……テ
ーパ面５ｂの交点、Fb……テーパ面８の交点、
θ₁……テーパ面５ｂの角度、θ₂……テーパ面８の
角度、θ₃……テーパ面８の傾斜角度。 The drawings show an embodiment of the pipe joint of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the pipe joint, and Fig. 2 is a longitudinal cross-sectional view of the pipe joint showing a state in which a withdrawal force is exerted in the direction of the arrow due to water pressure. Figure 3 is a front view of the split ring, Figure 4A
Figure 4B is a vertical cross-sectional view of the split ring, Figure 4B is a vertical cross-sectional view showing the second annular groove, and Figures 5 and 6 are the intersection positions of the tapered surfaces of the split ring and the taper surfaces of the jetty, or FIG. 7 is a vertical cross-sectional view of the joint body in a split configuration. DESCRIPTION OF SYMBOLS 1... Joint body, 2... Annular elastic body, 3... First annular groove, 5... Split ring, 5a... Protrusion,
5b... Tapered surface, 6... Second annular groove, 7...
Jetty, 8...Tapered surface, 10...Pipe, Fa...Intersection of tapered surface 5b, Fb...Intersection of tapered surface 8,
θ ₁ ... Angle of the tapered surface 5b, θ ₂ ... Angle of the tapered surface 8, θ ₃ ... Angle of inclination of the tapered surface 8.

Claims

[Claims for Utility Model Registration] 1. First annular grooves for mounting annular elastic bodies are formed on the inner circumferential surface of both open ends of a cylindrical joint body, and the joint is located inwardly from these first annular grooves. A second annular groove into which a split ring for pipe tightening is fitted is formed on the inner circumferential surface of the main body, and a joint is formed on the inner circumferential surface of the jetty provided between the first annular groove and the second annular groove. A tapered surface that becomes larger in diameter inward from the open end of the main body is formed, and
A tapered surface is formed on the outer circumferential surface of the split ring in contact with the tapered surface, and the intersection of both tapered surfaces on an extension line of one tapered surface is located on the central axis of the joint body or on a line parallel to the central axis. A pipe joint characterized in that the intersection point on the extension line of the other tapered surface deviates from this line. 2 The relationship between the angle θ ₁ of the tapered surface formed on the split ring and the angle θ ₂ of the tapered surface formed on the jetty is θ ₁ ≧ θ ₂
A pipe joint according to claim 1 of the utility model registration claim.