JP2009257087A - Rubber ring mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber ring mounting structure capable of achieving watertight sealing performance at a specified position by preventing a rubber ring from being separated or coming off from a mounting face, being twisted or broken, or undergoing other failures due to external pressure at the time of joining a pipe end. <P>SOLUTION: The rubber ring mounting structure comprises a mounting base side including an insert section and the other section including an inclined blade piece on which an external force is applied when a connection pipe is press-fitted. The insert section has a cross-section of a dovetail shape, and the upper part of the insert section of the rubber ring is widened in the axial direction of the joining pipe as compared with the lower part at the outer end. The insert section on the mounting base side is fitted as a loop in a recessed groove having a shape same as the shape of the insert section to prevent the insert section from being deformed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rubber ring mounting structure that is press-fitted into a connection portion between end portions such as a box culvert, an arch culvert, and a fume tube.

  Japanese Unexamined Patent Publication No. 5-263457 discloses a rubber ring that is press-fitted in a connecting portion between end portions such as a box culvert.

  However, since the rubber ring disclosed in the above publication is formed with uniform quality by utilizing the properties of rubber, and the mounting base side is attached to the pipe end surface, the outer end surface of the rubber ring applies external pressure during press-fitting. If it is received, there is a drawback that as shown in FIG. 5, peeling, slipping out, twisting, tearing, etc. occurs from the pipe end face and there is no press-fitting in place.

JP-A-5-263457

  The problem to be solved by the present invention is to prevent the mounting base side of the rubber ring from being peeled off, pulled out, twisted, broken or the like even when the outer end surface of the rubber ring is subjected to external pressure.

The present invention includes a mounting base side including an insert portion in which a rubber ring is mounted around one side of a connection pipe such as a box culvert, an arch culvert, and a fume pipe, and an inclination in which an external pressure acts when the connection pipe is press-fitted. And a rubber ring mounting structure that is press-fitted into the connection between the ends of adjacent connecting pipes, and the insert portion has a dovetail shape, The upper part of the insert part of the rubber ring is wider in the axial direction of the connecting pipe than the lower part of the outer end of the rubber ring, and the insert part is arranged so that the insert part on the mounting base side does not deform. It is characterized in that it is circularly attached to a concave groove having the same shape as the cross-sectional shape of the insert portion.
Furthermore, the present invention is characterized in that the constant thickness on the mounting base side of the rubber ring is set to a strong hardness that does not cause deformation in the range of 65 to 85 HA in durometer hardness.
Further, the present invention is characterized in that the rubber ring is attached to the outer surface of the male tube end on one side of the connecting tube or the inner surface of the female tube end.

  In the present invention, the fixed thickness on the mounting base side including the insert portion of the rubber ring is prevented from being deformed, and other portions including the inclined blade pieces are formed of a deformable ordinary elastic body. At this time, even if an external pressure is applied to the outer end surface of the rubber ring, it is reliably prevented that the rubber ring mounting base side is peeled, pulled out, twisted, torn or the like due to the deformation, and the water is inserted by press-fitting into a predetermined position. The effect of sealing is produced.

(Example 1) (a) thru | or (f) are fragmentary sectional views which show the various attachment examples of a rubber ring. Partial sectional view showing that deformation does not occur on the mounting base side in a state where the pipe ends are being joined. (Embodiment 2) A cross-sectional view of a rubber ring showing an example in which other portions are made elastic in order toward the outer end surface. (Example 3) Partial sectional view showing an example of color connection The figure which shows the state in which the mounting base side was deformed, peeled off and pulled out in response to the external pressure during fitting in the conventional rubber ring

The present invention has been made by paying attention to the fact that the hardness can be divided into 2 minutes and 3 minutes in a single rubber ring. The constant thickness t on the side of the circumferential mounting base including the insert part of the rubber ring is set to a durometer. The hardness was set to a strong hardness (rigidity) without causing deformation of 65 to 85 HA.
Further, the other portion S of the rubber wheel 1 other than the constant thickness t on the mounting base side was successively elasticized toward the outer end surface.
Accordingly, the present invention has been realized in such a manner that even when the outer end surface of the rubber ring is subjected to external pressure during press-fitting, peeling, slipping out, twisting, tearing and the like accompanying deformation of the rubber ring are prevented.

FIG. 1 shows various attachment examples of the rubber wheel 1.
(A) of the figure shows an example in which the mounting base side of the rubber ring 1 is attached around the outer surface of the male tube end 2a by an insert when the box culvert 2 is molded. 1a is the insert part.
(B) of the figure shows another example of the shape of the insert portion 1a in which the mounting base side of the rubber ring 1 is circularly attached to the outer surface of the male pipe end 2a when the box culvert 2 is molded.
(C) of the figure shows an example in which the constant thickness t on the mounting base side of the rubber ring 1 is slightly outside the insert portion 1a.
(D) of the same figure shows the example which provided the ditch | groove 2b in the outer surface of the male pipe end 2a, and fitted and attached the attachment base | substrate side of the rubber ring 1. FIG.
(E) of the figure shows that the mounting base side of the rubber ring 1 formed in the same shape is fitted into the dovetail provided on the outer surface of the male pipe end 2a, or the rubber ring 1 is attached to the upper surface of the inserted rubber base 1b. An example is shown.
(F) of the figure shows an example in which the rubber ring 1 is attached to the inner surface of the female tube end 2c. 1c has shown the insert part.

The rubber ring 1 includes the insert mounting portion, and the constant thickness t on the mounting base side is set to a hardness unit HA in the JIS standard, K6253 5 durometer hardness test in the range of 65 to 85 HA, that is, a strong hardness that does not cause deformation. The portion S is formed so as to be elastically deformed by a normal elastic body of 45 to 64 HA including each inclined blade piece 1d.
Reference numeral 1e denotes a hollow portion provided in the middle of the other portion S of the rubber ring 1.

The constant thickness t on the mounting base side is the entire thickness in the groove, such as the insert portion 1a, and may be up to a portion with a certain width protruding from the tube end surface in consideration of adhesive mounting.
Further, as shown in FIG. 1A, the insert portion 1a has a narrow width portion 1f in the middle so as not to come out.

  As shown in FIG. 2, when the box culvert 2 is forwardly fitted to the adjacent culvert 2c, the outer end surface of the rubber ring 1 receives external pressure by the culvert 2c, but the constant thickness t on the mounting base side does not deform 65 to 85HA. Since it is formed with a high hardness, it is reliably prevented that peeling, slipping out, twisting, tearing, etc. due to the deformation of the insert portion 1a occur, and it is press-fitted into a predetermined position and water-sealed. Will be.

  3 and 4 show an example in which the constant thickness t on the mounting base side of the rubber ring 1 is made to have a high hardness of 65 to 85 HA without deformation, and the other portions S are made elastic in order toward the outer end surface.

FIG. 4 shows an example of connection using the collar 3. The rubber ring 1 is attached to the outer surface of the male pipe end 2 a of the box culvert 2 in the same manner as in the first or second embodiment, and enters the collar 3. Let them connect.
Since the constant thickness t on the mounting base side of the rubber ring 1 is set to a strong hardness of 65 to 85 HA that does not deform, the contact pressure of the collar 3 is pressed into a predetermined position and interposed.

According to experiments with various rubber rings, when the hardness of the fixed thickness t on the mounting base side of the rubber ring 1 is lower than 65 HA, deformation is easily caused when subjected to external pressure, and the hardness higher than 85 HA is Difficulties arise in manufacturing and handling.
In general, the hardness is preferably 75 to 85 HA, and an appropriate hardness is selected for the rubber ring 1 in consideration of various conditions such as the shape and size of the rubber ring 1 and the temperature environment of the place of use.

  The rubber ring 1 of the present invention can be applied to any joint portion that is press-fitted into a connecting portion such as a male-female fitting such as a box culvert or a fume tube, or a collar joint.

Reference numeral 1 denotes a rubber ring 1a, an insert portion 1b, a rubber base 1c, an insert portion 1d, an inclined blade piece 1e, a hollow portion 1f, a narrow width portion t, a constant thickness s on the mounting base side, and the other portion 2, a box culvert 2a, a male The tube end 2b is a concave groove 2c, the female tube end 3 is a collar for a joint.

Claims (4)

A mounting base side including an insert portion in which a rubber ring is mounted around one end of a connecting pipe such as a box culvert, an arch culvert, and a fume pipe, and an inclined blade piece on which external pressure acts when the connecting pipe is press-fitted. And a rubber ring mounting structure that is press-fitted into the connection between the ends of the adjacent connection pipes.
The cross-sectional shape of the insert part has a dovetail shape, and the upper part of the insert part of the rubber ring is wider than the lower part of the outer end of the rubber ring with respect to the axial direction of the connecting pipe,
The insert portion is circularly attached to a concave groove having the same shape as the cross-sectional shape of the insert portion so that the insert portion on the attachment base side does not deform.
Rubber ring mounting structure.   2. The rubber wheel mounting structure according to claim 1, wherein the fixed thickness of the rubber ring on the mounting base side is in the range of 65 to 85 HA in durometer hardness.   3. The rubber ring mounting structure according to claim 1, wherein the rubber ring is attached to the outer surface of the male pipe end on one side of the connection pipe.   3. The rubber ring mounting structure according to claim 1, wherein the rubber ring is attached to the inner surface of the female pipe end on one side of the connecting pipe.

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