JP2001099369A - Flexible coupling and small manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust an inclined angle of a connection tube and to prevent a large difference in level on an internal surface of a conduit. SOLUTION: A first short tube 18 is connected with an inflow port 14 of a small manhole 12, a connection tube 16 is inserted by passing the tube 16 through a tubular elastic body 20 from a second short tube 22 and a tube end of the connection tube 16 is fixed within an expanded diameter socket 28 of the first short tube 18. Therefore, when an angle of the connection tube 16 is adjusted, the connection tube 16 is displaced with the tip as a fulcrum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint and a small manhole, and more particularly to a flexible joint having a function of adjusting an angle of a conduit and a small manhole provided with such a flexible joint.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a universal joint 1 for a main pipe is connected to an inlet 3 of a small manhole 2, and
By rotating the second part 1b relative to the part 1a, the angle between these axes is adjusted, thereby adjusting the angle of the connecting pipe 4 connected to the second part 1b. Was.

[0003]

In the universal joint 1 for a main pipe, since the sealing material is interposed between the joining surfaces of the first portion 1a and the second portion 1b, the frictional resistance at the time of rotation is large, and the angle is small. There is a problem that the workability of the adjustment is poor and that it is difficult to finely adjust the angle after inserting the connecting pipe.

As a means for solving this problem, there has been a case where a small manhole 6 having a spherical universal joint 5 at an inlet 2 is used as shown in FIG. According to the small manhole 6, although the angle of the connection pipe 4 can be easily adjusted, when adjusting the angle in the inclined direction, the universal joint 5 is required.
Since a large step 7 (FIG. 9 (B)) is formed on the inner surface of the lower part of the camera, there is a possibility that sewage accumulation, spillage of the sewage, running obstacles of the self-propelled camera and the like may occur.

[0005] Therefore, a main object of the present invention is to provide a flexible joint and a small manhole which can easily adjust the angle and can prevent a large step from being formed in a pipeline.

[0006]

According to a first aspect of the present invention, there is provided a first short tube having a first end formed with a spigot which can be inserted into an inlet of a manhole and a second end formed with an enlarged diameter receiving end at the other end. A tubular elastic member having one end connected to the enlarged diameter receiving port of the tube, and a second rubber member connected to the other end of the tubular elastic member and having a rubber ring attached to an inner peripheral surface thereof.
A flexible joint comprising a short pipe, inserting a connecting pipe through a tubular elastic body from a second short pipe, and stopping a pipe end of the connecting pipe in an enlarged diameter receiving port.

According to a second aspect of the present invention, there is provided a manhole body having an inflow port and an outflow port, a first short pipe having one end connected to the inflow port and an enlarged diameter receiving port formed at the other end, and an expansion of the first short pipe. A tubular elastic body having one end connected to the diameter receiving opening; and a second short pipe connected to the other end of the tubular elastic body and having a rubber ring mounted on an inner peripheral surface thereof. Is a small manhole in which the connecting pipe is inserted by passing through the pipe and the pipe end of the connecting pipe is stopped in the enlarged diameter receiving port.

[0008]

The first short pipe is connected to the manhole, the second short pipe is passed through the tubular elastic body, the connection pipe is inserted, and the end of the connection pipe is stopped in the enlarged diameter receiving port of the first short pipe. So
When adjusting the angle of the connecting pipe, the connecting pipe can be easily displaced with its tip as a fulcrum. Further, since the gap between the inner surface of the flexible joint and the outer surface of the connection pipe is sealed by a rubber ring, there is no fear of water leakage.

[0009]

According to the present invention, the angle of the conduit can be easily adjusted. Moreover, since the connecting pipe is displaced with its tip as a fulcrum, when adjusting the angle in the inclined direction, it is possible to prevent a large step from being formed on the inner surface at the lower part of the pipe.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A flexible joint 10 of this embodiment shown in FIG.
For example, as shown in FIG. 2A, it is connected to an inlet 14 of a small manhole 12 buried in the ground, and adjusts an inclination angle of an upstream pipe, that is, a connecting pipe 16.

The flexible joint 10 (FIG. 1)
8, including a tubular elastic body 20 and a second short pipe 22.

The first short pipe 18 includes a main body 24 made of a synthetic resin such as vinyl chloride or the like, and a spigot 26 which can be inserted into the inflow port 14 of the manhole 12 is formed at one end of the main body 24. The other end is formed with an enlarged-diameter receiving port 28 for receiving the pipe end of the connection pipe 16.

The tubular elastic body 20 includes a bellows-shaped main body 30 made of an elastic material such as rubber or an elastomer.
A receiving port 32 for receiving the enlarged diameter receiving port 28 of the first short pipe 18 is formed at one end of the main body 30, and a receiving port 34 for receiving the pipe end of the second short pipe 22 is formed at the other end of the main body 30. Is done.

The second short pipe 22 includes a main body 36 made of a synthetic resin such as vinyl chloride or the like. A rubber ring mounting groove 38 is formed on the inner surface of the main body 36, and a rubber ring 40 is formed in the rubber ring mounting groove 38. Is attached. The inner diameter of the main body 36 is set to be slightly larger than the outer diameter of the connecting pipe 16 so that the connecting pipe 16 can pass therethrough, and the minimum inner diameter of the rubber ring 40 can be tightly attached to the outer surface of the connecting pipe 16. , Is set sufficiently smaller than the outer diameter of the connection pipe 16.

The first port 32 of the tubular elastic body 20 is
The enlarged diameter receiving port 28 of the short pipe 18 is inserted and adhered, and the receiving port 3
The tube end of the second short tube 22 is inserted into and bonded to 4, thereby forming the flexible joint 10. However, socket 3
2 and the first short pipe 18 (the enlarged diameter receiving port 28), and the receiving port 34 and the second short pipe 22 may be connected by a fastening band or the like (not shown). Further, as shown in FIG. 3, for example, the first short pipe 18, the tubular elastic body 20, and the second short pipe 22 are integrally formed by injection molding (two-color molding of vinyl chloride or the like and an elastomer). Is also good.

When adjusting the angle of the connection pipe 16 using the flexible joint 10, first, as shown in FIG. 4A, a concave portion 30a formed on the outer surface of the tubular elastic body 20 (main body 30) is formed.
Then, a C-ring (stainless steel ring or hard plastic ring or the like) 20a as shown in FIG. 4B is attached to prevent the tubular elastic body 20 from being deformed. That is, if the tubular elastic body 20 is deformed, it becomes difficult to insert the connection pipe 16, and this is prevented beforehand.

Subsequently, as shown by the two-dot chain line in FIG. 2A, the spigot 26 of the first short pipe 18 is inserted into the inflow port 14 of the manhole 12 and adhered, and The connection pipe 16 is inserted through the tubular elastic body 20, and the pipe end of the connection pipe 16 is stopped in the enlarged diameter port 28.

Then, the C ring 2 attached to the recess 30a
0a (FIG. 4) is removed, and the angle is adjusted by holding the connection pipe 16 by hand. When adjusting the angle of the inclination direction, as shown in FIG. 2B, the connection pipe 16 is displaced with its tip as a fulcrum. Therefore, a step is formed between the enlarged diameter receiving port 28 and the outlet 26 of the first short pipe 18 on the inner surface of the lower part of the pipe, but no larger step is generated. Also,
Since the flexible joint 10 is bent at the tubular elastic body 20, the angle of the inclined direction can be easily adjusted. After adjusting the angle of the inclination direction, the pipes on the further upstream side are sequentially piped.

According to this embodiment, the angle of the pipe 16 in the direction of inclination can be easily adjusted, and a large step can be prevented from being formed on the lower inner surface of the pipe. In addition, the flexible joint 10
The gap between the inner surface of the connection pipe 16 and the outer surface of the connection pipe 16 is sealed by the rubber ring 40, so that water leakage can be prevented.

In the above embodiment, the tubular elastic body 20
Although the main body 30 is formed in a bellows shape, for example, as shown in FIG. 5, the main body 30 may be formed in a straight tubular shape. That is, the shape of the tubular elastic body 20 (the main body 30) is not limited insofar as it can secure a predetermined flexibility.

Further, in the above-described embodiment, the axis of the spigot 26 and the axis of the enlarged-diameter receiving port 28 in the first short pipe 18 coincide with each other. For example, as shown in FIG. The axis A may be eccentric downward with respect to the axis B of the enlarged diameter receiving port 28, so that a step on the lower inner surface of the first short pipe 18 may be eliminated.

In the above-described embodiment, the spigot 26 (FIG. 1) is formed at one end of the first short pipe 18, and the spigot 26 is connected to the inflow port 14 of the manhole 12.
For example, as shown in FIG. 7, the second short pipe 22 of the flexible joint 10 may be connected to the outlet 44 of the manhole 12.

Further, the flexible joint 10 of the embodiment shown in FIG. 1, FIG. 5 or FIG.
, And may be factory-shipped as a small manhole having the flexible joint 10.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a use state of the embodiment in FIG. 1;

FIG. 3 is an illustrative view showing another embodiment of the present invention;

FIG. 4 is an illustrative view showing a C-ring mounted on an outer surface of the tubular elastic body 20;

FIG. 5 is an illustrative view showing another embodiment of the present invention;

FIG. 6 is an illustrative view showing another embodiment of the present invention;

FIG. 7 is an illustrative view showing another use state of the embodiment in FIG. 1;

FIG. 8 is an illustrative view showing a conventional technique;

FIG. 9 is an illustrative view showing another related art;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Flexible joint 12 ... Small manhole 14 ... Inflow port 16 ... Connection pipe 18 ... 1st short pipe 20 ... Tubular elastic body 22 ... 2nd short pipe 26 ... Spout 28 ... Large diameter receiving port 40 ... Rubber ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoaki Inuchi 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside Kubota Vinyl Pipe Plant Co., Ltd. 72) Inventor Yasushi Matsushita 64, Ishizukita-cho, Sakai City, Osaka, Japan, inside the Kubo Tavinyl Pipe Factory. (72) Inventor Tomoaki Hori, 64, Ishizukitamachi, Sakai City, Osaka Prefecture. JC09 JD01 LB01 LB36 LG02

Claims (2)

[Claims] 1. A first short pipe having a spigot formed at one end thereof which can be inserted into an inlet of a manhole, and a large-diameter receiving port formed at the other end, and one end at the large-diameter receiving port of the first short pipe. And a second short pipe connected to the other end of the tubular elastic body and having a rubber ring attached to an inner peripheral surface thereof, and passing through the tubular elastic body from the second short pipe. A flexible joint, wherein the connecting pipe is inserted and the pipe end of the connecting pipe is stopped in the enlarged diameter receiving port. 2. A manhole body having an inflow port and an outflow port, a first short pipe having one end connected to the inflow port and an enlarged diameter receiving port formed at the other end, and the enlarged diameter of the first short pipe. A tubular elastic body having one end connected to the receiving port, and a second short pipe connected to the other end of the tubular elastic body and having a rubber ring attached to an inner peripheral surface thereof; A small manhole in which a connecting pipe is inserted through an elastic body, and a pipe end of the connecting pipe is stopped in the enlarged diameter receiving port.