JPS6231753Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a blind plug that is attached to the end of a pipe such as a sewage pipe to prevent dirt, rainwater, etc. from flowing into the pipe.

(Conventional technology) Due to construction reasons, branch pipes are sometimes left in the middle of pipes such as sewage pipes, and bottomed pipes are installed to prevent rainwater, groundwater, soil, etc. from entering through these openings. A cylindrical blind stopper is fitted.

(Problem that the invention aims to solve) Since this type of blind plug is made according to the diameter of one pipe, it is necessary to prepare blind plugs of each size that are suitable for different diameters. . In addition, resin pipes such as hard vinyl chloride pipes are often used for sewer pipes, and one end of this type of resin pipe is expanded in diameter to form a socket, which is connected with adhesive. There are two types, one with a seal ring connection and the other with a seal ring connection. The diameter of the socket is generally several mm larger when connected with a seal ring, and the conventional blind plug cannot be expected to provide sufficient sealing performance for one socket, so two types of blind plugs are prepared. However, since the diameter of the sockets differs by only a few millimeters as mentioned above, it is troublesome for the operator and there is an extremely high risk of misuse. Additionally, another blind plug is required that can be applied to the insertion port at the other end of the resin tube. As described above, three types of blind plugs are required even for one size of resin pipe, which is undesirable in terms of cost, management, and construction.

In view of this, the inventor has decided to
In No. 11009 (Utility Model Application No. 55-110893), a flange is formed in the middle of a closed cylinder whose both ends are closed, and the cylinder on one side of the flange has a large diameter, and the cylinder on the other side has a large diameter. A blind plug for a conduit, in which the body is a small diameter part, annular grooves are provided along the circumferential direction on the outer peripheral surfaces of the large diameter part and the small diameter part, and an annular elastic body is attached to the groove. Proposed.

However, when the blind plug in the invention related to the above-mentioned earlier application is used in a resin pipe such as a hard vinyl chloride resin pipe, the pipe may be deformed into a flattened state due to external loads such as earth pressure. The root part on the flange side of the tube insertion part is reinforced by the flange provided to lock onto the tube end surface and is difficult to deform, so it does not follow the flatness of the tube and the sealing performance of the annular elastic body is impaired. It had the disadvantage of being damaged.

(Means for solving the problems) This invention aims to further improve the drawbacks of the invention related to the earlier application, and
The gist is that a flange is provided in the middle part of the closed cylinder, and a small diameter tube insertion part is placed on one side of the flange as a boundary.
A large-diameter tube insertion portion is provided on the other side, and an annular groove for mounting an annular elastic body is provided along the circumferential direction on the outer peripheral surface of both tube insertion portions. The blind plug for a conduit is provided with an annular elastic body attached thereto, and at least a cylindrical wall of the root portion on the side of the flange of the small-diameter tube insertion portion is reduced in diameter to provide an annular concave portion.

(Function) The closed cylinder has a small diameter and a large diameter tube insertion part,
Since the annular elastic body is attached to either end, by changing the annular elastic body, it can be used for two types of pipe ends, such as the socket part and the insertion part. Even if the diameter varies, this variation can not only be absorbed, but it can also be used as is for both adhesive sockets and seal ring sockets.

In addition, at least the cylindrical wall at the root on the flange side of the small-diameter tube insertion portion is reduced in diameter and provided with an annular recess, so the root portion on the flange side is easily deformed. Following the deformation, the tube insertion portion also deforms easily, and watertightness can be maintained even if the tube is deformed relatively largely due to external pressure.

(Embodiment) Hereinafter, the blind plug for a pipeline of the present invention will be described with reference to the embodiment shown in the drawings.

Reference numeral 1 denotes a closed cylinder made of plastic, which includes a large-diameter tube insertion section 11, a small-diameter tube insertion section 12, and a collar section 1 that is a stopper provided at a connecting section between these sections.
3, and both ends thereof are closed 14, 14.

Large diameter tube insertion section 11 and small diameter tube insertion section 12
Annular grooves 111 and 121 are provided along the circumferential direction on the outer circumferential surface of each of the grooves 111 and 121, respectively.
A recessed portion 15 is provided in communication with 121 .
The width of the recessed portion 15 is set to a width that allows a finger or the like to be inserted thereinto. In one groove 121, rubber,
An annular elastic body 2 made of synthetic resin foam or the like is attached. The cylindrical wall of the root portion on the side of the collar 13 of the small-diameter tube insertion portion 12 to which the annular elastic body 2 is attached is reduced in diameter to provide an annular recessed portion 122 . In this embodiment, a concave portion similar to the small diameter tube insertion portion 12 is not provided at the root portion of the large diameter tube insertion portion 11 on the side of the flange 13; This is because the sealing performance is not as strictly required as the sealing performance of the small-diameter tube insertion portion 12, and of course, a recessed portion may be similarly provided.

The annular elastic body 2 has a small diameter tube insertion portion 1 on its outer periphery.
Of course, it protrudes from the circumferential surface of 2, and if necessary, it can be separated from the groove 121 and removed.
It can be attached to the other groove 111. Annular elastic body 2
When the annular elastic body 2 is removed from the concave groove 121, since the concave portion 15 is provided, the annular elastic body 2 can be easily removed by inserting a finger or the like into this portion and stretching the annular elastic body 2.

In this embodiment, the closing portions 14, 14 are provided at both ends so that the closing effect will not be impaired even if one of them is torn, but they may be provided only on one side, or may be provided at the center of the cylindrical body.

In this embodiment, the small diameter tube insertion section 12 is used for the insertion port 4, and the large diameter tube insertion section 1
1 is used for the sockets 3, 5, etc. When using the large-diameter tube insertion part 11, by transferring the annular elastic body 2 to the groove 111, the adhesive socket 3 (aligned with the two-dot chain line) Although the diameter of the seal ring socket 5 differs by several millimeters, it is fully applicable to both.

(Effects of the invention) As described above, the blind plug for pipes of this invention has a small-diameter and a large-diameter pipe insertion part, and the annular elastic body is attached to either of them, so the annular elastic body can be easily transferred. As a result, it can be used for two types of pipe ends, such as the socket part and the insertion part, and even if the pipe diameter varies due to the annular elastic body, it can not only absorb the variation, but also can be used for adhesive sockets. , can be used as is for both seal ring sockets.

In addition, since the cylindrical shape of the root portion on the flange side of the tube insertion portion to which the annular elastic body is attached is reduced in diameter and an annular concave portion is provided, the root portion on the flange side is easily deformed. Therefore, the tube insertion portion easily deforms following the deformation of the tube, and even if the tube is relatively largely deformed by external pressure, the adhesion of the annular elastic body is not impaired and watertightness can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view of an embodiment of the blind plug for pipes of this invention. 1... Closed cylinder body, 2... Annular elastic body, 11...
Large diameter tube insertion portion, 12...Small diameter tube insertion portion, 11
1,121... Concave groove, 122... Annular concave portion, 1
5... Concavity.

Claims (1)

[Scope of utility model registration request] A flange is provided in the middle part of the closed cylinder, and a small-diameter tube insertion part is provided on one side of the flange as a boundary, and a large-diameter tube insertion part is provided on the other side, and the outer peripheral surfaces of both tube insertion parts are An annular groove for mounting an annular elastic body is provided along the circumferential direction, and the annular elastic body is attached to one of the grooves, and at least the root on the flange side of the small diameter tube insertion part. A blind plug for pipes in which the diameter of the cylindrical wall is reduced and an annular concave portion is provided.