JP2000102486A - Rubber stopper for draining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber stopper for draining which exhibits an excellent water stopping property while suppressing the bite of water stopping surfaces and is extremely easily mountable to a drain port. SOLUTION: The outer peripheral surface of a stopper part 3 having an approximately spherical outer peripheral surface is recessed with annular parallel grooves 41 in multiple stages, by which many thin annular projecting films 42 for water stopping are integrally molded axially in parallel between the respective grooves. All of the projection heights of these annular projecting films 42 are set uniform. The water stopping surfaces 4 formed with the water stopping surfaces 41 as the elastically deformable spaces of the annular projecting films 42 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber plug for drainage used for closing a drainage port of a water tank such as a bathtub, a basin, and a sink.

[0002]

2. Description of the Related Art Conventionally, a bathtub,
Rubber stoppers for opening and closing drains in tanks such as washbasins and sinks
There are various forms such as a tapered rubber stopper having a water stop surface formed in a tapered shape and a spherical rubber stopper formed in a spherical shape. These rubber stoppers use the elastic rebound (restoring force) of rubber material.
The watertightness is maintained by bringing the water stop surface into close contact with the side wall in the drainage port by utilizing the above. In addition, since the rubber stopper generates excessive expansion and pressing force depending on the water temperature and the water pressure, the rubber stopper has a certain degree of rigidity as a whole in order to suppress the water stop surface from biting to the side wall of the drain port. .

[0003]

The above-mentioned spherical rubber stopper is intended to eliminate the disadvantages of the tapered rubber stopper. In other words, the tapered rubber stopper is such that the watertightness is maintained only when the tapered water stop surface conforms to the tapered side wall of the drain port for the first time. If it is installed, a gap will be created between the water stop surface and the tapered side wall, and water will leak from the gap. It is necessary to perform an operation of pushing after fitting into the mouth. This means
For example, when installing at the drain of a bathtub, the user must bend down, reach out and carefully check the installation, which is cumbersome, and requires considerable heavy labor, especially for the elderly and disabled. Will be. Conversely, even if the water is fitted, the water stop surface and the tapered side wall are completely adhered to each other, causing the water stop surface to bite, and in the worst case, the pulling chain may be broken. On the other hand, the spherical rubber stopper has a water-stopping surface with a spherical shape, so that even if it is installed at an angle to the drainage port, one of the water-stopping surfaces must be in contact with the tapered side wall of the drainage port. Even if there is some inclination, water tightness is ensured, and since the contact area of the water stop surface with the tapered side wall is smaller than that of the tapered rubber plug, biting of the water stop surface is suppressed.

[0004] However, the spherical rubber plug is not without problems, and since the rubber plug itself has rigidity as described above, a sufficient elastic repulsive force of the rubber material cannot be used, so that the water stop surface is tapered. Difficult to fit into side walls. That is, if the water stop surface does not fit into the tapered side wall, a gap is easily generated between the water stop surface and the tapered side wall because the contact area of the water stop surface with the tapered side wall is originally small, and the gap is a cause of water leakage. Was. For this reason, the entire plug is provided with an elastic repulsive force by being cut out axially from below the plug, and the water repelling surface is pressed against the tapered side wall by using the elastic repulsive force, thereby increasing the contact area with the tapered side wall. There is also a hollow rubber stopper as described above, but since the hardness of the water stop surface does not change even in this case, the contact area of the water stop surface with the tapered side wall is not increased as expected. Therefore, even with such a spherical rubber stopper, it is necessary to actually push it in when attaching it to the drain port, and it has still been solved in terms of preventing fundamental water leakage and easy installation in the drain port. It is not at present.

[0005] The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to exhibit excellent water stopping performance while suppressing the biting of the water stopping surface, and to attach it to a drain port very well. An object of the present invention is to provide a rubber plug for drainage that can be performed easily.

[0006]

The present invention has the following technical means to attain the object mentioned above. The technical means of claim 1 is to provide a thin-walled annular ring for stopping water between each groove by forming annular parallel grooves in a multi-stage shape on the outer peripheral surface of the plug having a substantially spherical outer peripheral surface. A large number of projection films were integrally molded in parallel to the axial direction, and the projection height of the annular projection film was all uniform, and a water-stop surface was formed in which the parallel groove was an elastic deformation space of the annular projection film. That is.

According to the above technical means, the rubber plug of the present invention has an uneven surface in which the water-stop surface of the plug is composed of a large number of independent thin annular projection films and a large number of independent parallel grooves. The extension line connecting the vertices of the annular projection film has a substantially spherical shape. In addition, since the annular projection film is integrally formed by forming annular parallel grooves in a water-stop surface in multiple stages, the maximum diameter of the plug portion is the same as that of a conventional spherical rubber plug. Since the annular projection film is thin, it easily undergoes elastic deformation irrespective of rubber properties, and is elastically deformed without difficulty due to the presence of the parallel grooves. When such a rubber plug is fitted into the drain port, any one of the annular projection films comes into contact with the tapered side wall and is deformed, and the annular projection film is deformed by a return force (elastic repulsion) from the deformation. Flexible and modest line contact with the tapered side wall.

The rubber stopper of the present invention encompasses all rubber stoppers integrally molded with a rubber material, such as a hollow rubber stopper having a hollow portion in the stopper portion, a rubber stopper having a solid stopper portion, and the like. . For example, in the case of a hollow rubber stopper, as described above, the entire plug portion has an elastic repulsive force, so that the repulsive elastic force and the repulsive elastic force of the annular projection film are applied, and the tapered side wall of the water stop surface is added. Adhesion to the surface is improved.

In order to bring the annular projection film into line contact with the tapered surface, it is desirable to make the tip spherical.
If it is a spherical surface, it will always make line contact regardless of the degree of deformation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rubber stopper according to the present invention will be described below with reference to the drawings. 1 and 2 show a rubber stopper 1 according to the present invention. Basically, a stopper 2 and a stopper 3 suspended from the stopper 2 are integrally formed of a rubber material.

The stopper lid 2 has a substantially umbrella-shaped side surface, and has a through hole 21 at the center for fitting a connecting piece (not shown) for connecting a pull-out chain (not shown). I have.

The plug portion 3 is formed with a hollow portion 31 which is hollowed in the axial direction from the lower end thereof.
1 communicates with the through hole 21. The hollow 3
1 is formed by being vertically cut out from the lower surface of the plug portion along the axial direction. The hollow portion 31 is a space for attaching the connecting piece and an elastically deformable space for the entire plug portion 3, and the presence of the space reduces the amount of rubber material, thereby reducing the rubber plug 1.
It has also greatly contributed to the weight reduction of

The water stop surface 4 formed on the outer periphery of the plug 3 has an uneven shape. When the water stop surface 4 is described in detail,
An annular parallel groove 41 is formed over the entire outer peripheral surface of the substantially spherical plug 3.
41 are formed in a multi-stage shape, and a large number of thin annular projection films 42... 42 for stopping water are integrally formed in parallel with each other in the axial direction between the respective grooves. Annular projection film 42 ...
Reference numeral 42 denotes that the projection height is uniform from the base to the tip of the projection film, that is, the extension line L connecting the vertices of the projection film has a substantially spherical shape. Also,
The annular projection films 42... 42 are formed with spherical ends at the ends thereof.
42, the spherical portions 43... 43 are always in line contact with the tapered side wall 51 of the drain port 5 irrespective of the degree of deformation. ing. The parallel grooves 41 are elastic deformation spaces of the annular projection films 42.

In the rubber plug 1 thus constructed, the water-stopping surface 4 is composed of thin annular projections 42 and 42 and parallel grooves 41... 41 which are elastic deformation spaces of the projections. It is very flexible and easily elastically deformed compared to other parts of the plug 1. Rubber stopper 1 is shown in FIG.
As shown in FIG. 5, when the rubber plug 1 is fitted and attached to the drain port 5, any of the spherical portions 43... 43 of the annular projection films 42. Elastic deformation due to line contact with
By the return force from the deformation, the tapered side wall 51 is supposed to be tightly adhered to the tapered side wall 51 to maintain the water stoppage. Further, since each of them is in line contact, the bite to the tapered side wall 51 is also prevented. Then, even in the case where the annular projection films 42 are arranged in a small-diameter drain port, the annular projection films 42 are smoothly fitted by the turning-up deformation. In addition, this rubber stopper 1
The elastic repulsive force of the entire plug portion 3 is added to the elastic repulsive force of the annular projecting films 42.
42 is more securely adhered to the tapered side wall 51. Since the extended line L connecting the vertices of the annular projection films 42... 42 has a substantially spherical shape as shown in FIG.
Like the conventional spherical rubber plug, any surface of the water stop surface 4 is in contact with the tapered side wall 51 even when the water stopper 5 is attached to be inclined with respect to the axis C of the drain port 5, that is, an annular projection film. 42 ... 42 Any number of spherical portions 43 ... 4
3 gently adheres to the tapered side wall 51.

The rubber stopper shown in FIG.
This rubber plug 1 ′ has the same configuration as the rubber plug 1 and the hollow 31, but has a different shape of the water stop surface 4. The water stopping surface 4 'of the present embodiment has the same width as the parallel grooves 41 ... 41 of the water stopping surface 4, but the parallel grooves 41' ... 41 'have several upper and lower groove widths. The width of the groove on the middle side is larger than that of the first embodiment. Specifically, the height of the plug portion 3 ′ is the same as the height of the plug portion 3 ′, and the width of the groove at the upper side and the lower side is reduced, and the width of the groove at the middle side is increased. It is. That is, by making the deformation space of the middle-side annular projection films 42 ′... 42 ′ used most larger than the upper and lower sides, the annular projection films 42 ′.
The amount of deformation is increased so that it can handle drains with smaller diameters. The description of the portions overlapping with the rubber plug 1 is omitted by attaching the same reference numerals.

The rubber stopper shown in FIG.
Is shown. This rubber plug 1 ″ has the same outer shape as the rubber plug 1 but has the hollow 31
Is different. Hollow hollow 3 in the present embodiment
1 ′, the side surface 6 is formed in a spherical shape along the outer shape of the water stop surface 4, so that the thickness of the plug portion 3 ″ is uniform from the upper end to the lower end, and the same applies to the entire plug portion 3 ″. The elastic repulsive force is exerted. The description of the portions overlapping with the rubber plug 1 is omitted by attaching the same reference numerals.

Each of the rubber plugs 1, 1 ', and 1''has hollow portions 31 and 31', but is not limited to this form. It may be a stopper. (Not shown) When the plug portion is made solid, even if the elastic repulsion of the plug portion can hardly be expected, the spherical portion of the annular projection film on the uneven water-stop surface adheres supplely as described above. Then, the water can be reliably stopped, so that it can be used without any problem.

[0018]

EXAMPLES The results of measuring the amount of water leakage between the rubber stopper of the present invention and the conventional rubber stopper by the following method are shown below. Measurement content: The rubber stopper of the present invention and the conventional rubber stopper are evaluated for water resistance in accordance with test B of JIS A1718. Measuring method: The rubber stopper is naturally dropped into the same drain port without pressing from above and closed, and the water depth near the drain port is about 40.
cm, and the amount of water leakage for 1 hour is measured.
The amount of water leakage at this time is within 300 cc according to the test B of JIS A1718. Rubber stopper of the present application: Rubber stopper 1 described above. Conventional rubber stopper: Normal rubber stopper. This method is performed three times in the present invention and the conventional method three times, and the average leakage amount, maximum leakage amount, and minimum leakage amount are as shown in Tables 1 and 2.

[0019]

[Table 1]

[0020]

[Table 2]

From the above measurement results, it was confirmed that the rubber stopper of the present invention reduced the amount of water leakage under the same conditions by a maximum of about 770 cc at maximum and about 300 cc on average as compared with the conventional rubber stopper. That is, it was proved that the rubber stopper of the present invention had extremely excellent water stopping properties. Moreover, the results of the above measurements are based on the JIS A1718 described above.
The average leak rate, the maximum leak rate, and the minimum leak rate are all significantly lower than the leak rate of 300 cc / h specified in Test B, and the value of the conventional rubber stopper is smaller than the value that almost no leak was confirmed. All except the amount of water leakage exceeded. In addition, the numerical value of the present invention is much lower than the water leakage rate of 30 cc / h specified in JIS A1718 test A. (JIS A1718 test A: A rubber stopper is freely dropped from a position about 1 cm directly above the drain port and closed.
Further, it is closed by pressing it from above with a force of 50 N (5.1 kgf). Thereafter, water is supplied until the water depth near the drain outlet becomes about 40 cm, and the amount of water leakage one hour after the water supply is measured. Water leakage is within 30cc / h. Therefore, the rubber stopper of the present invention exhibits an excellent water-stopping property that is not available in the related art, even when the rubber stopper is dropped and attached to the drain port.

[0022]

The present invention has the following advantages by the above configuration. In the rubber stopper of the present invention, any one of a large number of independent thin-walled annular projection films is deformed by contacting the tapered side wall with respect to the tapered side wall, and the return force (elastic repulsion) from the deformation is obtained. Due to this, the tip of the annular projection film is supple to the tapered side wall, and closely adheres with the line contact with good moderation, and the extended line connecting the apexes of the annular projection film has a substantially spherical shape. Because it always comes into close contact with the tapered side wall, even if it is installed in a rough manner, such as dropping it to the drain port and mounting it at an angle to the drain port, it has an extremely high water stoppage that is not available in the past. To demonstrate. In addition, it is not necessary to bend down, reach out, and push in further when installing in the drain of a bathtub with deep water. It is an excellent rubber stopper that greatly contributes to the recent barrier-free. In addition, since the annular projection film is in close contact with the tapered side wall by line contact, the water stop surface is prevented from biting on the tapered side wall, and problems such as cutting of the pull-out chain caused by being unable to come off from the drain port are resolved. it can. In addition, even if it is disposed in a small-diameter drain port, it can be smoothly fitted by deformation of the annular projection film, so if the drain port has a diameter smaller than the diameter of the rubber plug before deformation,
Drain outlets of different diameters can be covered with one type of rubber stopper. Furthermore, since the annular projection film is formed integrally with the plug by forming the parallel groove, the molding is extremely simple,
Since there is no need to attach a separate member such as an O-ring, it has a high effect in reducing the manufacturing cost. In addition, since the maximum diameter of the plug portion is the same as that of a conventional spherical rubber plug, a drain port is particularly provided. Since it is not necessary to change the size, it is sufficient to simply replace the conventional one, that is, it is possible to provide a reliable water stopping effect without imposing a financial burden on the user. Therefore, it is possible to provide a rubber stopper for drainage in which the above-mentioned object is achieved.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a rubber stopper.

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

FIG. 3 is an enlarged sectional view of a main part in a state attached to a drain port.

FIG. 4 is an enlarged cross-sectional view of a main part in a state of being attached to a drain port at an angle.

FIG. 5 is an enlarged sectional view of a main part showing a second embodiment of the rubber stopper.

FIG. 6 is a half sectional view showing a third embodiment of the rubber stopper.

[Explanation of Signs] 1, 1 ', 1'': Rubber stopper 3,
3 ', 3': Plug part 4, 4 ': Water stop surface 41, 41':
Parallel grooves 42, 42 ': annular projection film

Claims (1)

[Claims] An annular parallel groove is formed in a multi-stage shape on the outer peripheral surface of a plug having a substantially spherical outer peripheral surface.
A large number of thin annular projection films for stopping water are integrally formed in parallel with each other in the axial direction between the respective grooves, and the projection heights of the annular projection films are all uniform, and the parallel grooves are formed in the annular projection film. A rubber plug for drainage, characterized in that a water-stopping surface is formed as an elastically deformable space.