JPH10132161A - Release preventing-type thimble - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slipping by engaging a circumferential projecting line with a projecting line on the outer periphery of an insertion port through a process of fitting a slip preventing ring provided with the projection lines in the circumferential direction on the inner surface to a socket inner surface, and also to easily perform slip prevention even by a conventional thimble. SOLUTION: In a thimble 1 in which flanges 2 are provided on both pipe ends and able to connect pipes by inserting pipe inserting ports from both sides, a lock ring 4 mounting groove 5 is provided behind a sealing rubber ring mounting taper part 3 provided on the opining end inner surface, and a split is axially inserted in the innermost surface of a projecting line 5A for constituting a mounting groove 5 so as to be elastically fitted to the inner surfaces of the thimble 1. A slip preventing ring 6 in which a plurality of projecting lines 6B...6B continued in the circumferential direction are axially formed on the inner circumferential surface at distances is constituted by mounting the ring stopper material 7 on the innermost part of it and inserting it.

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, at a bent portion of a pipeline, a thrust axial force is generated by a water flow flowing inside, and this is a force for moving the pipeline toward the outside of the bent portion. And the power to do.

[0004] In some cases, a strong axial external force acts 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.

In order to achieve such an object, the present applicant has proposed a separation-prevention type connecting ring as shown in FIG. 5 (for example, Japanese Patent Application No. 8-206727, drawings). The release-prevention type connecting ring is formed by inserting a release-prevention ring B made of a material softer than the pipe, for example, nylon, into both receiving pipes A formed of ductile cast iron pipe or the like. A plurality of protrusions C... C provided on the inner surface of
The lock ring E fitted to the outer periphery of the tube insertion hole D is engaged to prevent detachment, and the projection C and the lock ring E are engaged with each other against a pulling force due to a normal thrust axial force or the like. When a strong axial external force is applied due to an earthquake or the like, the lock ring E gets over one projection and excessive stress is applied to the insertion port D and the receiving pipe A as shown in FIG. This is prevented from occurring, and then the next projection C prevents the escape, and finally the annular projection F formed on the inner surface of the receiving opening prevents the escape.

[0007]

In the above, since the engagement between the separation preventing ring B and the insertion opening D is performed by the lock ring E, as shown by a dotted line in FIG. In addition, the concave groove G for the lock ring E is wasted, and conversely, it is necessary to newly provide a projection H for the separation preventing ring B, and there is a problem that a process for forming a joint ring is required.

The present invention has been made to solve the above problems.

[0009]

In other words, a separation-prevention type connecting ring according to the present invention is provided on an inner surface of an open end of a connecting ring in which flanges are provided at both ends of a pipe and a pipe insertion port can be inserted and connected from both sides. A lock ring mounting groove is provided at the back of the tapered portion for mounting the rubber ring for sealing, and the shaft is resiliently fitted to the inner surface of the connecting ring at the back inner surface of the ridge forming the mounting groove. A short pipe split in the direction,
A detachment prevention ring in which a plurality of circumferentially continuous ridges are formed on the inner peripheral surface at intervals in the axial direction is inserted after attaching a ring stopper to the back thereof. Things.

[0010]

Next, an embodiment of the present invention will be described.
FIG. 1 is an enlarged 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. 1, and FIG. 3 is a sectional view showing another embodiment.

In FIG. 1, reference numeral 1 denotes a joint ring of a cast iron pipe provided with flanges 2 on both sides, and a groove for mounting a lock ring 4 is provided at a depth of a tapered portion 3 for mounting a rubber ring for sealing provided on an inner surface of an open end. A short pipe provided with a split 6A in the axial direction so as to be resiliently fittable on the inner surface of the connecting ring 1 on the inner surface on the inner side of the ridge 5A constituting the mounting groove 5; A detachment prevention ring 6 is formed by forming a plurality of circumferentially continuous protruding ridges 6B... 6B on the peripheral surface at an interval in the axial direction. ing.

In the above description, the separation preventing ring 6 is made of a material softer than cast iron, for example, made of nylon.
The detachment prevention ring 6 is a short tube having an outer diameter larger than the inner diameter of the main body of the connecting ring 1 and smaller than the outer diameter in order to be resiliently fitted to the inner surface of the connecting ring 1. Split 6
A (FIG. 2).

In the above embodiment, the stepped portion 6C which can be engaged with the projection 8A formed at the end of the insertion opening 8 as the cross-sectional shape of the ridge 6B is shown, but as shown in FIG. May have a smooth surface.

In order to connect the insertion opening 8 to the separation-preventing type connecting ring, first, the separation-prevention ring 6 is inserted from both ends of the pipe, and fitted into the opening. Next, the lock ring 4 is inserted into the mounting groove 5 and fixed, and then the insertion opening 8 is inserted. Insert 8
The end face 8B of the lock ring 4 is tapered, and the inner surface 4A of the lock ring 4 is also tapered, so that the insertion opening 8 is inserted through the lock ring 4 and is inserted through each of the ridges 6B. Alternatively, they are connected as shown in FIG.

In the figure, reference numeral 4B denotes an elastic rubber ring for centering the metal lock ring 4. Then, the rubber ring 9 and the pressing ring 10 are attached to terminate the connection.

After connection, when an external axial force is applied to the pipe,
With a normal external force, the insertion opening 8 is prevented from coming off by the engagement between the projection 8A on the end face and the projection 6B of the separation prevention ring 6. The detachment prevention ring 6 is supported by the inner surface of the ridge 5A and does not come off.

Next, when a large external force is applied due to an earthquake or the like and cannot be supported by the resistance of the ridge 6B of the separation preventing ring, the projection 8A pushes the ridge 6B and moves as shown in FIG. The next ridge 6B prevents slipping out again.

[0018]

As described above, when the pull-out force is applied to the pipe, the slip-off preventing type connecting ring of the present invention has a certain degree of engagement by the engagement of the projection at the end of the insertion pipe with the ridge of the slip-off prevention ring. When the external force exceeding the limit is applied, the ridge itself is deformed and the lock ring is moved, so that the effect of safely preventing the pipe connection portion from being released can be exerted.

Further, since the separation-prevention type connecting ring of the present invention has a shape having a lock ring accommodating groove at the back of the taper portion for mounting the seal rubber, it can be implemented using the same connecting ring as before. It has the effect that it can be implemented at low cost.

[Brief description of the drawings]

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

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

FIG. 3 is a cross-sectional view showing another embodiment.

FIG. 4 is a sectional view for explaining a pull-out preventing action.

FIG. 5 is a sectional view of a main part of a conventional example.

FIG. 6 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 ... Tapered part for mounting a rubber ring for sealing 4 ... Lock ring 5 ... Mounting groove 5A ... Protrusions forming a mounting groove 6 ... Separation prevention ring 6A ... Split 6B ... Protrusions 6C ... Step 7: Ring stopper 8: Insertion 8A: Projection 9: Rubber ring 10: Press ring

Claims (1)

[Claims] 1. A connecting ring in which flanges are provided at both ends of a pipe and which can be connected by inserting a pipe insertion port from both sides, a lock ring is mounted on the inner side of an opening end at a depth behind a taper portion for mounting a rubber ring for sealing. And a short pipe in which an inner groove is provided so as to be resiliently fitted to the inner surface of the connecting ring on the inner surface at the inner side of the ridge forming the mounting groove. An anti-separation type characterized in that a separation prevention ring formed by forming a plurality of circumferentially continuous ridges at intervals in the axial direction is inserted after attaching a ring stopper to the back thereof. Connecting ring.