JP3393027B2 - Rubber ring - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber ring, and more particularly to a rubber ring used for sealing a gap between a receiving port and a spout at a joint portion of a pipe.

[0002]

2. Description of the Related Art An example of a conventional rubber ring of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 5-14778. As shown in FIG. 5, this rubber ring 1 includes a main body 4 that is accommodated in a rubber ring groove 3 formed in a receiving port 2, and an inner peripheral portion of the main body 4 extends from the tip end side of the receiving port 2 to the inner side. A lip 6 having an inclined surface 5 that extends toward the inner side and inclines at a constant angle toward the tube axis side is formed toward the inner side. A thick portion 7 is formed at the end of the lip 6 on the rear side of the receptacle 2. The thick portion 7 prevents the outlet 8 from being easily separated from the receptacle 2.

[0003]

In the prior art, since the inclined surface 5 of the lip 6 is inclined at a constant angle, it is difficult to prevent the rubber ring 1 from falling while ensuring water-stopping property. That is, if the inclination angle of the inclined surface 5 is made smaller, the compression ratio of the rubber ring 1 compressed by the inlet 8 becomes smaller, so that sufficient water stopping performance cannot be obtained. Since the position where the tip of the mouth 8 first comes into contact with the inclined surface 5 is the tip side of the receptacle 2 (the position shown by the chain double-dashed line in FIG. 5), the rubber ring 1 may fall down when the outlet 8 is inserted. was there.

Therefore, a main object of the present invention is to provide a rubber ring which can obtain sufficient waterproofness and can prevent the rubber ring from rolling.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a main body is housed in a rubber ring groove of a receiving opening, and extends from the front end side of the receiving opening in the main body toward the rear side and inclines toward the pipe axis toward the rear side. In a rubber ring having a lip having an inclined surface with which the spigot abuts, the inclined surface is a first inclined surface formed on the tip side of the receiving port and inclined at a first angle with respect to the pipe axis, A second inclined surface that is formed on the inner side of the receiving port with respect to the first inclined surface and inclines at a second angle larger than the first angle with respect to the pipe axis ;
The thickness of the second inclined surface portion of the
And wherein the lower child thinner than a rubber ring.

[0006]

When the first angle of the first inclined surface of the lip is made smaller, the position where the tip of the spigot inserted into the receptacle first comes into contact with the lip is on the back side of the receptacle than when the first angle is large. . Further, when the second angle of the second inclined surface is increased, the compression rate of the rubber ring compressed by the spout becomes greater than that when the second angle is small.

[0007]

According to the present invention, sufficient waterproofness can be obtained by decreasing the first angle of the first inclined surface of the lip and increasing the second angle of the second inclined surface, Moreover, the rubber ring can be prevented from falling. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rubber ring 10 of this embodiment shown in FIG.
As shown in FIG. 1, the inner surface of the receiving port 14 formed at the end of the pipe 12 and the end of the pipe 16 inserted in the receiving port 14, that is, the spout 1
8 is for sealing the gap with the outer surface of
4 includes a main body 22 housed in the rubber ring groove 20 formed in 4.

The outer diameter of the main body 22 is substantially the same as the inner diameter of the rubber ring groove 20 (for example, the outer diameter of the main body 22 ≈1.01).
× the inner diameter of the rubber ring groove 20), the inner diameter of the main body 22 is set slightly larger than the outer diameter of the inlet 18,
The width (length in the pipe axis direction) is set to be substantially the same as the width (length in the pipe axis direction) of the rubber ring groove 20. And the main body 2
The outer peripheral surface of 2 is formed with a ridge 26 that fits into the groove 24 formed on the inner peripheral surface of the rubber ring groove 20, and the inner peripheral portion of the main body 22 has the tip end side of the receiving port 14 of the main body 22. A lip 28 having an inclined surface extending from the inner side to the inner side and inclining toward the tube axis side toward the inner side is formed.

The inclined surface of the lip 28 is first with respect to the tube axis.
A first inclined surface 30 that inclines at an angle (for example, 20 °) and a second inclined surface 30 that extends from an end of the first inclined surface 30 and is larger than the first angle.
The second inclined surface 32 is inclined at an angle (for example, 45 °), and a thin portion 34 is formed at a part of a free end of the lip 28 (a rear end of the receiving port 14). Further, on the inner side of the receiving opening 14 in the main body 22, a protruding portion 36 is formed so as to protrude in the pipe axis direction.

When the pipe 12 and the pipe 16 are joined, the rubber ring 10 is mounted in the rubber ring groove 20 and then the spigot 18 is inserted into the receiving port 14. When the insertion opening 18 is inserted from the tip of the receiving opening 14, the tip of the insertion opening 18 contacts the second inclined surface 32 of the lip 28 as shown in FIG. The portion 18a contacts the first inclined surface 30. At this time,
Since the first angle of the first inclined surface 30 is relatively small,
The position where the tip of 8 first comes into contact with the lip 28 (the second inclined surface 32) is relatively behind the receiving port 14. Therefore,
The problem that the rubber ring 10 is pushed by the outlet 18 and falls does not occur.

As the insertion opening 18 is further inserted, the insertion opening 1
The chamfered shoulder portion 18a of 8 abuts on the second inclined surface 32 of the lip 28, the lip 28 is expanded by the spigot 18 and abuts on the protruding portion 36, and the entire main body 22 is compressed. Therefore, the outer surface of the spigot 18 and the first inclined surface 30 and the second inclined surface 32 of the lip 28 are in close contact with each other, and the adhesion is improved by the thin portion 34, so that sufficient water stoppage can be obtained. it can.

According to this embodiment, the socket 18 is provided in the socket 14.
It is possible to prevent the rubber ring 10 from rolling down when inserting, and it is possible to obtain sufficient waterproofness due to the protrusion 36 and the thin portion 34. Further, even if the spigot 18 is flat and the gap width between the outer surface of the spigot 18 and the inner surface of the receiving port 14 becomes large, the tip of the lip 28 follows the outer surface of the spigot 18, so Can be surely sealed.

A rubber ring 38 of another embodiment shown in FIG. 4 has a thick portion 40 formed at a part of the free end of the lip 28 (the end portion on the rear side of the receiving port 14) in the previous embodiment. is there. According to this embodiment, since the tip end portion of the lip 28 is provided with rigidity by the thick portion 40, the insertion resistance of the opening 18 is larger than that in the above-mentioned embodiment, but the tip end portion of the lip 28 is Rippling can be prevented, and the appearance can be improved.

[Brief description of drawings]

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

FIG. 2 is an illustrative view showing a usage state of the embodiment in FIG.

FIG. 3 is an illustrative view showing a state in which the tip of the spigot is in contact with the second inclined surface of the lip.

FIG. 4 is an illustrative view showing another embodiment of the present invention.

FIG. 5 is an illustrative view showing a conventional technique.

[Explanation of symbols]

10, 38 ... Rubber ring 12, 16 ... Tube 14… Reception 18 ... 20 ... Rubber ring groove 22… Main body 28 ... Lip 30 ... First inclined surface 32 ... Second inclined surface 34 ... Thin part 36 ... Projection 40 ... Thick part

Front Page Continuation (72) Inventor Kayo Matsushita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Co., Ltd. Inside the vinyl pipe factory (56) Reference JP-A-57-163794 (JP, A) JP-A-5-79587 (JP, A) Actual Kaihei 5-14778 (JP, U) Registered utility model 3012027 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 21/02

Claims (3)

(57) [Claims] 1. A main body housed in a rubber ring groove of a receiving port, and an abutting member that extends from the front end side of the receiving port in the main body to the inner side and inclines toward the pipe axis toward the rear side. And a lip having a slanted surface, wherein the slanted surface is formed on a tip side of the receiving port and slants at a first angle with respect to the tube axis, and the first slanted surface. A second inclined surface that is formed on the inner side of the receiving surface with respect to the inclined surface and inclines at a second angle larger than the first angle with respect to the tube axis, and a thickness of the second inclined surface portion of the lip.
And wherein the lower child thinner than the thickness of the first inclined surface portion only, rubber ring. 2. The rubber ring according to claim 1, further comprising a protruding portion that is formed on the inner side of the receiving opening in the main body so as to protrude in the pipe axis direction. 3. The rubber ring according to claim 1, further comprising a thick portion formed on a part of a free end of the lip.