JP3333104B2 - Separation prevention type connecting ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a separable ring.

[0002]

2. Description of the Related Art It is necessary to take measures to prevent detachment of a pipe joint in a portion of a pipe where an axial tensile force or an internal pressure acts, in order to prevent an outlet from being pulled out.

For example, a thrust axial force is generated at a bent portion of a pipe by a water flow flowing inside the pipe, and this is a force for moving the pipe to the outside of the bent portion. .

In some cases, a strong external force acts in the axial direction due to an earthquake or the like. Therefore, at the bent portion of the pipeline, the pipe is fixed with a concrete foundation or the like so as to oppose the external force as described above, so that the pull-out force does not reach the adjacent pipe joint.

However, it is difficult to construct the above-described concrete structure at a bent portion of a pipeline in an urban area where buried objects are congested, and it is necessary to provide a pipe joint itself adjacent to the bent portion with a detachment preventing function. Required.

[0006] In order to achieve such an object, a separation-prevention type connecting ring as shown in FIG. 4 is known. The above-mentioned separation-prevention type connecting ring has a plurality of projections C... C provided in the inside of both receiving pipes A formed of ductile cast iron pipe or the like, in which a separation prevention ring B is inserted and provided on the inner surface circumferential direction of the separation prevention ring B.
In order to prevent disengagement by engaging a projection E at the insertion end of the pipe insertion D, the engagement between the projection C and the projection E at the insertion tip against a normal pulling force due to a thrust axial force or the like. When a strong axial external force is applied due to an earthquake or the like, as shown in FIG. This is prevented from being generated in the mouth tube A, and then prevented from coming off by the next projection C, and finally can be prevented from being pulled out by the lock ring F fitted into the inner surface of the receiving port.

[0007]

In the above description, the receiving opening A and the receiving opening D into which the separation preventing ring B is fitted have respective dimensional tolerances, and the inner and outer diameters have a certain width.

In this case, if the receiving port has the maximum radius of the inner diameter tolerance and the insertion port has the minimum radius of the outer diameter tolerance, the gap between the two in the tolerance range becomes the maximum and such a dimensional relationship is obtained. In such a case, the protrusion C of the separation prevention ring B did not engage with the protrusion E on the outer surface of the insertion opening, and the function of preventing the removal did not occur in some cases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a function to prevent the slipping out without fail even when the gap is maximized. The purpose of the present invention is to provide a mold connecting ring.

[0010]

In other words, a detachable connecting ring according to the present invention is a connecting ring in which flanges are provided at both ends of a pipe and a pipe insertion port is inserted from both sides to enable connection. A short pipe having an outer diameter larger than the inner diameter and smaller than the outer diameter, which is cut in the axial direction, is capable of being resiliently fitted to the inner surface of the connecting ring, and is interrupted in the inner circumferential surface in the circumferential direction. A plurality of rows of nail pieces are formed at intervals in the axial direction,
An axially cross-sectional shape of the claw piece is formed in a fin shape inclined toward the inner side of the pipe, and a detachment prevention ring in which an intermediate portion of the claw piece is bent in the pipe insertion direction is provided on the inner surface of the joining ring. The extension length as viewed in the tube axis direction of the center bent claw piece formed on the inner surface of the anti-separation ring is inserted from the largest radius of the inner diameter tolerance of the receiving port, It is characterized in that it is made larger than the value obtained by subtracting the value of the minimum inside radius.

[0011]

Next, an embodiment of the present invention will be described. FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the invention described in claim 1, and FIG. 2 is a sectional view taken along line YY of FIG.

In FIG. 1, reference numeral 1 denotes a joint of a cast iron pipe provided with flanges 2 on both sides, and a short pipe having an outer diameter larger than the inner diameter of the main body of the splicer 1 and smaller than the outer diameter. A split 4 (FIG. 2) is inserted in the direction, and the claw pieces 5... 5 which can be resiliently fitted to the inner surface of the connecting ring 1 and are continuous in the inner circumferential direction with the inner circumferential surface of the short pipe are formed in the axial direction. A plurality of rows are formed at intervals, and the axial cross-sectional shape of the claw piece 5 is formed into a fin shape inclined toward the inside of the pipe (arrow P), and an intermediate portion of the claw piece is bent in the direction of the pipe insertion port. The anti-separation ring 3 formed in a shape is fitted into the opening of the inner surface of the connecting ring 1 so as to face the opening, and the extension length L of the center-bending claw piece 5 formed on the inner surface of the anti-separation ring 1 as viewed in the tube axis direction. Is a value obtained by subtracting the value of the minimum radius of the tolerance of the outer diameter of the insertion port 6 from the maximum radius of the tolerance of the inner diameter of the receptacle as shown in FIG. It is constituted by larger.

That is, the inclination angle of a line (indicated by a dashed line) drawn from the root portion to the tip of the claw piece 5 is θ, and the value of the minimum radius of the tolerance of the outer diameter of the insertion opening to the maximum radius of the tolerance of the inner diameter of the receiving port. It is assumed that L> R sin θ when the value obtained by subtracting R is R.

In the above description, the detachment prevention ring is made of a thin metal plate, and the claw piece 5 is deformed in the rising direction (arrow Q) by its metal elasticity. Therefore, even when the members having the largest difference among the allowable tolerances are joined, the tip of the claw piece 5 is securely engaged with the projection at the tip of the insertion opening.

Further, since the nail piece 5 is bent in the middle and the contact angle α with the insertion opening is made smaller than θ, the nail piece 5 exerts a resistance in a direction in which the insertion opening comes out. Is also excellent.

In FIG. 1, reference numeral 7 denotes a lock ring, and reference numeral 10 denotes a backup ring. In order to connect the insertion opening 6 to the separation-prevention type connecting ring, first, the separation-prevention ring 3 is inserted from both ends of the tube, fitted to the opening, the locking ring 7 is inserted, and then the insertion opening 6 is inserted. I do.

The end face 6A of the insertion opening 6 is tapered and the claw piece 5 is formed.
Since is inclined toward the back of the pipe, the insertion opening 6 is inserted while pressing and bending the claw piece 5 from the distal end protruding portion 6B, and is connected as shown in FIG.

Finally, the backup ring 10, the rubber ring 8 and the pressing ring 9 are attached to terminate the connection. After connecting,
When an external force in the axial direction is applied to the tube, the insertion opening is prevented by the engagement of the tip projection 6B and the claw piece 5 with a normal external force.

Next, when a large external force is applied due to an earthquake or the like and cannot be supported by the resistance force of the claw piece 5 of the separation prevention ring, the tip protrusion 6B pushes the claw piece 5 to deform or break and move. I do.

Then, the insertion opening 6 is prevented from coming out again by the claw piece 5 located on the opening side of the next stage.

[0021]

As described above, even if the difference between the inner diameter of the receiving portion of the connecting ring and the outer diameter of the insertion opening has the maximum of the tolerances, the claw piece for preventing the slipping out is surely at the front end of the insertion opening. Therefore, the function of preventing the detachment of the connecting ring is reliably achieved.

Furthermore, since the nail piece is bent at the center and has a small contact angle α with the insertion hole, it is easily caught by the projection at the insertion end.
It has the effect of being excellent in the slip-out prevention effect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is an enlarged sectional view of a main part showing an embodiment.

FIG. 4 is a sectional view of a main part of a conventional example.

FIG. 5 is a sectional view for explaining a pull-out preventing action of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Connecting ring 2 ... Flange 3 ... Separation prevention ring 4 ... Split 5 ... Claw piece 6 ... Insertion 7 ... Lock ring 8 ... Rubber ring 9 ... Push ring 10 ... Elastic member

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-185037 (JP, A) JP-A-9-189385 (JP, A) JP-A-10-238675 (JP, A) JP-A-10- 47569 (JP, A) JP-A-10-132161 (JP, A) JP-A-7-293759 (JP, A) JP-A-7-243419 (JP, A) JP-A 10-238672 (JP, A) JP-A-4-132292 (JP, U) JP-A-4-122890 (JP, U) Patent 3278582 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 21/00- 21/08

Claims (1)

(57) [Claims] 1. A connecting ring having flanges provided at both ends thereof and having a pipe inlet inserted from both sides to be connectable. The connecting pipe is a short pipe having an outer diameter larger than the inner diameter of the connecting ring body and smaller than the outer diameter. There is a split in the axial direction, a plurality of rows of claw pieces that are resiliently fittable on the inner surface of the connecting ring and that are intermittent in the circumferential direction on the inner peripheral surface are formed at intervals in the axial direction, An axially cross-sectional shape of the claw piece is formed in a fin shape inclined toward the inner side of the pipe, and a detachment prevention ring in which an intermediate portion of the claw piece is bent in the pipe insertion direction is provided on the inner surface of the joining ring. The extension length as viewed in the tube axis direction of the center bent claw piece formed on the inner surface of the anti-separation ring is inserted from the largest radius of the receiving bore diameter tolerance, and the insertion outside diameter tolerance Of which the value is smaller than the value of the minimum inside radius. Wheel.