JP2002317893A - Flexible branch pipe coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible branch pipe coupler which has excellent seal performance, which can be composed of fewer members to reduce cost, and which facilitates installation. SOLUTION: This flexible branch pipe coupler for connecting a branch pipe S to a main pipe H such as a sewer is provided with a coupler main body 2 of rubber comprising a base part 3 to be densely fixed to an outer surface of the main pipe H, and an attachment part 4 raised from the base part 3 on which the branch pipe S is engaged to be attached. A ring 7 is engaged in a circular groove 6 provided on an outer circumferential surface at an upper end of the attachment part 4, and on an inner circumferential surface of the upper end of the attachment part 4, a fork-shaped seal lip 5 comprising an inner lip 5a directed diagonally downward and an outer lip 5b directed roughly straight upward is circumferentially protruded. As the branch pipe S is engaged and attached to the attachment part 4, the inner lip 5a is pressed by the branch pipe S to fall in a tight adhesion state to position a tip of the inner lip 5a below a middle point N of a circular groove 6. By rotation moment M of the inner lip 5a, the outer lip 5b is tightly applied to the branch pipe S to form a double seal structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible branch pipe joint for connecting a branch pipe to a main pipe such as a sewer pipe.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional branch pipe joint for connecting a branch pipe to a main pipe of a sewer pipe. The branch pipe joint 21 is made of rubber and includes a base 23 attached to the outer surface of the main pipe H, and an assembling part 24 erected from the base 23 and fitted with the branch pipe S.

In this prior art, at a construction site, first, an adhesive or a bonding agent is applied to
It is fixed to the main pipe H by the above method. Next, the branch pipe S is attached to the mounting section 2.
4 Finally, the assembly part 24 is fastened to the branch pipe S with a stainless steel hose band 27 to fix them together. Note that a butyl adhesive or sponge rubber is attached to the inner peripheral surface near the tip of the assembling portion 24 in advance.

[0004]

However, the conventional branch pipe joint 21 requires a sealing member 25 and a hose band 27 in addition to the above, so that many members are required and the cost is increased. There is a problem that installation is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and is a flexible branch pipe joint which has excellent sealing properties, can be constructed with a small number of members, can reduce costs, and can be easily mounted. The task is to provide

[0006]

A description will be given with reference to FIGS. 1 to 5. In order to connect the branch pipe S to the main pipe H such as a sewer pipe, the present invention provides a base 3 tightly fixed to the outer surface of the main pipe H.
And a rubber fitting part 4 erected from the base part 3 and into which the branch pipe S is fitted and assembled. A ring 7 is fitted into the annular groove 6 provided, and a forked seal composed of an inner lip 5a directed obliquely downward and an outer lip 5b directed substantially upward is provided on the inner peripheral surface of the upper end of the assembly portion 4. When the lip 5 is protrudingly provided and the branch pipe S is fitted into the mounting portion 4, the inner lip 5 a is pressed by the branch pipe S and falls down in a close contact state, and the tip of the inner lip 5 a is inserted into the annular groove 6. The outer lip 5b is positioned lower than the point N and has a double seal structure in which the outer lip 5b is in close contact with the branch pipe S by the rotational moment M of the inner lip 5a.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A flexible branch pipe joint 1 according to the present invention
1 to 4 show an example of the first embodiment. This is a base 3 tightly fixed to a perforated portion on the outer surface of the main pipe H in order to connect a branch pipe S made of the same vinyl chloride resin to the main pipe H made of vinyl chloride resin of the sewer pipe, A flexible branch pipe joint 1 having a rubber joint body 2 erected from its base 3 and comprising a rubber mounting part 4 into which a branch pipe S is fitted and mounted.
It is. The base 3 is fixed to the main pipe H by a general means using a U band, a number line 8 or the like after applying an adhesive or a bonding agent. Alternatively, the base 3 may be fixed with a butyl adhesive in advance.

Further, as shown in a second embodiment of FIG.
The joint body 12 includes a vinyl chloride resin base 13 and the base 1.
3 and a rubber assembly portion 14 fixed by a hose band 17.

A ring 7 made of vinyl chloride resin, which hardly extends, is fitted in an annular groove 6 provided on the outer periphery of the upper end of the assembly portion 4.

On the inner peripheral surface of the upper end of the assembling part 4, a forked seal lip 5 composed of an inner lip 5a directed obliquely downward and an outer lip 5b directed substantially upward is integrally protruded. Has been established. Thereby, when the branch pipe S is fitted into the mounting portion 4, the inner lip 5a is
And the tip of the inner lip 5a falls down in contact with the inner lip 5a and the tip of the inner lip 5a is positioned lower than the middle point N of the annular groove 6, and a rotational moment M about the center point Q of the ring 7 is generated. In FIG. 4, when a force perpendicular to the branch pipe S generated in the inner lip 5a is Pa, and a distance between the force Pa and the ring center point Q is La, M = Pa · L.
a. Due to the rotational moment M, the outer lip 5b falls down to the branch pipe S side and is pressed against the branch pipe S with the force of Pb. The force perpendicular to the branch pipe S applied to the outer lip 5b is P
b, and when the distance between the force Pb and the ring center point Q is Lb, Pb · Lb = M. As a result, a double seal structure that is in close contact with the branch pipe S is obtained.

The seal lip 5 is composed of an inner lip 5a and an outer lip 5b, and has a double seal structure of the inner lip 5a and the outer lip 5b using the rotational moment M. Excellent in nature. That is, since the inner lip 5a projects obliquely downward, the inner lip 5b elastically contacts the branch pipe S, and the outer lip 5b always elastically contacts the branch pipe S by the action of the rotational moment M. Therefore, a double seal structure having an extremely large elastic contact force can be obtained. Further, the double seal structure is firmly maintained for a long period of time by the regulation of the ring 7.

In addition, when the branch pipe S is fitted into the mounting portion 4 at the construction site, the flexible joint is connected to the branch pipe S.
Can be obtained only by the operation of simply fitting the seal member into the assembling portion 4, and a conventional sealing material and a hose band are not required. Accordingly, members other than the flexible joint are not required, and the assembling work is extremely easy, so that it is possible to reduce the construction time and the number of construction tools.

In the second embodiment shown in FIG. 5, since the vinyl chloride resin base 13 is fixed to the vinyl chloride resin main tube H via an adhesive, the fixation is reliable, and the rubber assembly portion is provided. 14 can have flexibility.

[0014]

According to the flexible watertight pipe joint according to the present invention, the seal lip 5 is formed by the inner lip 5a and the outer lip 5
b, and a double sealing structure of the inner lip 5a and the outer lip 5b is developed by utilizing the rotational moment M generated by the ring 7.
Extremely excellent sealing properties. Further, the double seal structure is firmly maintained for a long period of time by the regulation of the ring 7.

In addition, since this flexible joint can obtain a strong double-sealed structure only by simply fitting the branch pipe S into the assembling portion 4 at the construction site, a flexible joint other than the flexible joint can be obtained. Since no member is required and the assembling work is extremely easy, the construction time can be reduced and the number of construction tools can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged half sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part showing a state before a branch pipe is attached in the embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a state where a branch pipe is attached in the embodiment of the present invention.

FIG. 5 is a front view showing a second embodiment of the present invention.

FIG. 6 is a front view showing a conventional technique.

7 is an enlarged half sectional view of a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch pipe joint 2 Joint main body 3 Base 4 Assembly part 5 Seal lip 5a Inner lip 5b Outer lip 6 Annular groove 7 Ring 8 Track 11 Branch pipe joint 12 Joint body 13 Base 14 Assembly part 17 Hose band 21 Branch pipe joint 23 Base 24 Assembling part 25 Sealing material 27 Hose band H Main pipe M Rotating moment N Midpoint of annular groove Q Center point of ring S Branch pipe

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hirokazu Hasegawa 2 Aron Kasei Co., Ltd., Nagoya Plant at 30 Shinshocho-cho, Tokai-shi, Aichi F-term (reference) 2D063 BA16 BA27 BA35 3H019 BA04 BB01 BB08

Claims (1)

[Claims] 1. A base (3) tightly fixed to the outer surface of a main pipe for connecting a branch pipe (S) to a main pipe (H) such as a sewer pipe, and the base is erected from the base. A branch pipe joint provided with a joint body (2) comprising a rubber mounting part (4) into which the branch pipe (S) is fitted and mounted, and an annular groove (6) provided on the outer periphery of the upper end of the mounting part. ), A ring (7) is fitted, and an inner lip (5a) directed obliquely downward on the inner peripheral surface at the upper end of the assembly portion.
And a bifurcated seal lip (5) consisting of an outer lip (5b) directed substantially upward and projecting around, and when the branch pipe is fitted into the mounting portion, the inner lip is attached to the branch pipe. The inner lip is pressed down and falls down in a close contact state, and the tip of the inner lip is positioned lower than the middle point (N) of the annular groove, and the outer lip comes into close contact with the branch pipe due to the rotational moment (M) of the inner lip. Flexible branch pipe joint.