JPH0629584Y2 - Lock ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a lock ring mounted in a pipe socket.

2. Description of the Related Art In a pipe joint having a receiving opening and an insertion opening, as shown in FIG. 12, a metal lock ring 3 mounted in a groove 2 on the inner surface of the receiving opening 1 is provided with the receiving opening 1 and the insertion opening 4. It is often used as a joint part with. As shown in FIG. 13, the lock ring 3 has a shape having a circumferentially divided gap portion 3a having a diameter slightly larger than the diameter of the groove portion 2 in a state where no external force is applied,
When mounted in the groove portion 2, it is configured so as to have a diameter expanding biasing force and to come into close contact with the groove portion 2. A backup ring 5 and a ring-shaped packing 6 made of rubber or the like are arranged in a circumferential direction on the receiving opening end side of the lock ring 3 between the insertion openings, and the backup ring 5 and the packing 6 are circumferentially arranged. A push wheel 7 that can be divided into two parts is pressed toward the opening end side of the insertion port and is fixed by a bolt 10. When connecting the receiving opening 1 and the insertion opening 4, the packing 6, the backup ring 5, and the lock ring 3 are passed through the outer circumference of the insertion opening 4 in advance in the order of the diameter of the packing 6, the backup ring 5, and the lock ring 3 respectively. The pipe is moved to a portion closer to the center from the insertion port 4 and externally fitted (deposited). Then, after inserting only the insertion opening 4 into the receiving opening 1, as shown in FIG.
Between the receiving opening 1 and the insertion opening 4 while engaging the tip of the scissor-like diameter reducing tool 8 with the groove portion 3b near the gap portion 3a and applying force in the direction of the arrow to reduce the diameter of the lock ring 3. Insert it, further expand the diameter of the groove portion 2 by its own elastic force and attach it. Thereafter, the backup ring 5 is pushed toward the insertion opening end side until it comes into contact with the lock ring 3, and the packing 6 is also pushed in the same manner. While the packing 6 is compressed by the push ring 7, the bolt 10 is fastened to the flange portion 9 of the receiving port 1. To do. This prevents the receiving opening 1 and the insertion opening 4 from coming off, and
The space between the receiving and inserting openings is sealed.

However, according to the above-mentioned conventional configuration, a large force is required for the work of reducing the diameter of the lock ring 3, and the inner circumference of the receiving port 1 is kept with the lock ring 3 in the reduced diameter state. And spout 4
Since it has to be fed into the groove 2 through a narrow gap with the outer circumference, it is difficult to mount the lock ring 3, and there is a problem that workability is extremely deteriorated particularly in the case of a small diameter pipe.

The present invention solves the above problems, and an object of the present invention is to provide a lock ring that can easily perform the diameter reduction work of the lock ring and the mounting work to the receiving groove portion.

Means for Solving the Problems In order to solve the above problems, the present invention divides a circumferentially-divided lock ring mounted on the inner surface of a receptacle into a plurality of pieces in the circumferential direction, and connects the divided portions with an elastic body. It was done.

Action With the above configuration, by interposing the elastic body between the divided portions, the lock ring is easily bent at the divided portions, so that when the diameter of the lock ring is reduced, a large force is not required. It is possible to easily perform the diameter reduction work of the lock ring and the attachment work to the receiving groove portion.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3 (a), the lock ring 11 made of cast iron mounted in the inner surface groove portion of the receiving port has a shape having a gap portion 12 divided in the circumferential direction, and It is divided into four parts, and one piano wire 14 is embedded in the end portion of the divided part 13 in the circumferential direction of the lock ring except for the gap part 12, and the divided parts 13 are appropriately connected to each other through this piano wire 14. It is connected at intervals of 15. In addition, 16 is a locking groove for a diameter reducing tool.

With the above configuration, since the split portions 13 are connected in the circumferential direction via the elastic piano wire 14, the lock ring is formed.
11 can be bent easily, which allows the lock ring
When reducing the diameter of 11, you do not need too much force,
It is possible to easily perform the diameter reduction work and the mounting work to the receiving groove portion.

In the above embodiment, the split parts 13 were connected by a piano wire 14, but this piano wire 14 is shown in FIG.
As shown in (b), two lock rings 11 may be arranged and connected in the thickness direction, or the number of piano wires 14 may be further increased. Also, as shown in FIG. 4, the piano wire 14
Instead of the above, a spring plate made of steel or a plate body 16 made of synthetic resin may be embedded along the circumferential direction of the lock ring, or a spring 17 may be used instead of the piano wire 14 as shown in FIG. .

Further, as shown in FIG. 6, a rubber material 18 having a round cross section may be used so that both ends thereof are embedded in the ends of the dividing portion 13, or as shown in FIG. 19 to wire 20
Is embedded in the end portion of the divided portion 13, and further, as shown in FIGS. 8 to 11, the rubber material 21,
22, 23, 24 may be interposed and bonded to the ends of the divided parts. In this case, as shown in FIG. 8, a rubber member 21 having the same sectional shape as the split portion 13 of the lock ring is used, or as shown in FIG. 9 or FIG. Arranged only on the outer peripheral side of the lock ring at the end of 13, or on the outer peripheral side and the inner peripheral side, and as shown in FIG. 11, use a rubber material 24 having a triangular shape whose outer peripheral side expands. You may.

As described above, according to the present invention, since the lock ring divided in the circumferential direction is divided into a plurality of pieces in the circumferential direction and the divided portions are connected by the elastic body, the lock ring is easily bent. As a result, less force is required for reducing the diameter, and even in the case of a small-diameter pipe, the diameter reducing work and the work of mounting in the receiving groove can be easily performed, and the work efficiency can be improved.

[Brief description of drawings]

1 to 11 relate to an embodiment of the present invention. FIG. 1 is an overall front view of a lock ring according to one embodiment, FIG. 2 is a schematic view of a main part, and FIG. FIG. 2 is a view taken along the line III-III in FIG. 3, and FIG. 3 (b) is a schematic view of a main part showing another embodiment, and FIGS.
The drawings are also schematic views of main parts showing other embodiments. Further, FIG. 12 is a sectional view of a conventional connecting portion between the insertion port and the receiving port, FIG.
FIG. 14 is an overall front view of the conventional lock ring, and FIG. 14 is a schematic view of a main part for explaining the operation of the conventional lock ring. 11 …… Lock ring, 12 …… Gap part, 13 …… Split part, 14
...... Piano wire, 16 …… Plate, 17 …… Spring, 18,1
9, 21, 22, 23, 24 …… Rubber material, 20 …… Wire material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsuhisa Toyoshima 2-26, Ohama-cho, Amagasaki City, Hyogo Prefecture Kubota Iron Works Co., Ltd. Mukogawa Works (56) References

Claims (1)

[Scope of utility model registration request] 1. A lock ring which is mounted on an inner surface of a receptacle and which is divided into a plurality of pieces in the circumferential direction and is divided into a plurality of pieces in the circumferential direction, and the divided portions are connected by an elastic body. .