JP2000035135A - Packing and tube connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the water leakage even in the case of tilting, and to prevent the lowering of workability by providing a tip of a lip part with an expansion part. SOLUTION: In a packing 1, a lip part 12 is projected inward from one side of an annular main body part 11, and a tip of the lip part 12 having a U-shaped cross section is provided with an expansion part 13 having a nearly circular cross section. In the case where the packing 1 is inserted into a recessed grove 22 of a socket 21 of a hard polyvinyl chloride tube 2 and where a spigot 31 of the other hard polyvinyl chloride resin tube is inserted into the receiver port 21, the expansion art 13 provided in the tip of the lip part 12 of the packing 1 tightly contacts with a surface of the spigot 31 so as to hold the water- tightness of a connection part of both hard polyvinyl chloride resin tubes 2, 3. Even in the case where one hard polyvinyl chloride resin tube 3 is tilted, water-tightness of the connection part is similarly held while following the tilting. With this structure, thickness of an intermediate part of the lip part 12 is not increased, and the spigot 31 can be inserted into the socket 21 without requiring a large force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing suitable for use in a receiving port of a pipe connection such as a sewer pipe, and a pipe connection using the packing.

[0002]

2. Description of the Related Art Conventionally, for example, see Japanese Patent Application Laid-Open No. H10-11046.
As described in Japanese Unexamined Patent Application Publication No. 3 (1993) -3, etc., a packing is known in which a lip portion protrudes inward from one side of an annular main body and has a substantially U-shaped cross section.

As shown in FIG. 3, such a packing (a) is mounted, for example, inside a receiving port (c) provided at one end of one hard vinyl chloride resin pipe (b), and the other hard packing. It is in close contact with the surface of the insertion port (e) provided at one end of the vinyl chloride resin pipe (d), and maintains water tightness between both hard vinyl chloride resin pipes (b) and (d). Even if the other hard vinyl chloride resin pipe (d) inclines to a certain degree (usually 3 to 5 degrees) with respect to the vinyl chloride resin pipe (b), it can cope with it.

[0004]

However, as shown in FIG. 4, it is assumed that one hard vinyl chloride resin pipe (a) is inclined by about 6 to 8 degrees with respect to one hard vinyl chloride resin pipe (a). In such a case, the lip portion (f) of the packing (a) cannot follow the inclination of the insertion opening (e), so that watertightness is reduced, and there is a disadvantage that water leakage may occur. If the entire thickness of the lip portion (f) is increased to solve such a problem, a large force is required to insert the insertion port (e) into the receiving port (c), and the insertion becomes difficult. Worsens.

The present invention has been made in view of such a problem in such a conventional packing, and an object of the present invention is to solve the above-mentioned problem, and to solve the problem described above, in which one pipe is connected to the other pipe. An object of the present invention is to provide a packing and a pipe connecting portion that do not cause water leakage even when inclined with respect to a pipe and do not cause a decrease in workability.

[0006]

In order to achieve the above object, the packing according to the first aspect of the present invention has a lip portion projecting inward from one side of the annular main body, and has a substantially sectional shape. A U-shaped packing, wherein a bulging portion is provided at a tip of a lip portion.

According to a second aspect of the present invention, there is provided a pipe connecting portion in which an insertion port is inserted into a receiving port, wherein the packing according to the first aspect is provided in the receiving port. It is a feature.

[0008] In the present invention, the material of the packing is the same as that used for the material of the packing, and is not particularly limited. Vinyl resin,
Polyethylene, polypropylene and the like can be used.

In the present invention, the cross-sectional shape of the packing is substantially U-shaped, and does not need to be exactly U-shaped.
It may be a substantially V-shape that has been turned over or a U-shape that has been turned over.

In the packing according to the first aspect of the present invention, since a bulging portion is provided at the tip of the lip portion, the other port is provided with an insertion port for one of the pipes provided with the receiving port. Even if the tube is inclined, the bulge at the tip of the lip portion comes into close contact with the surface of the insertion tube, so that watertightness can be maintained.

Since it is not necessary to increase the thickness of the middle part of the lip, even if a bulge is provided at the tip of the lip, workability can be improved without requiring much force when inserting the insertion opening. There is no danger of drop.

Further, in the pipe connecting portion of the present invention according to claim 2, since the packing according to claim 1 is provided in the receiving port, an insertion port is provided for one of the pipes provided with the receiving port. Even if the other pipe is inclined, the bulge at the tip of the lip portion comes into close contact with the surface of the insertion pipe, so that watertightness can be maintained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an upper half battle cutaway showing an example of the packing of the present invention. In FIG. 1, reference numeral 1 denotes a packing made of synthetic rubber of the present invention. As shown in FIG. 1, the packing 1 has a lip portion 12 protruding inward from one side of an annular main body portion 11 and has a sectional shape. It is almost U-shaped and has a lip 1
A bulging portion 13 having a substantially circular cross-sectional shape is provided at the tip of 2.

Since the packing 1 of the present invention shown in FIG. 1 has the above-described structure, when used, as shown in FIG.
If the packing 1 is inserted into the inside 2, and if the insertion port 31 of the other hard vinyl chloride resin pipe 3 is inserted into the receiving port 21,
The bulging part 13 provided at the tip of the lip part 12 of the packing 1 is brought into close contact with the surface of the insertion opening 31, and the watertightness of the connection part between the two hard vinyl chloride resin pipes 2 and 3 is maintained.

Even if the other hard vinyl chloride resin tube 3 is inclined with respect to the one hard vinyl chloride resin tube 2, the tip of the lip portion 12 of the packing 1 follows the inclination of the other hard vinyl chloride resin tube 3. The bulging portion 13 provided in the
, The watertightness of the connection between the two rigid vinyl chloride resin tubes 2 and 3 is maintained. Since the thickness of the middle portion of the lip portion 12 does not increase, a large amount of force is not required when inserting the insertion port 31 into the receiving port 21, and there is no possibility that the workability is reduced.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration of the present invention is not limited to the illustrated embodiment, and design changes within the scope of the present invention may be made. Included in the invention. For example, the cross-sectional shape of the bulging portion 13 may be oval, triangular, or quadrangular in addition to the circular shape as in the illustrated embodiment.

[0017]

In the packing according to the first aspect of the present invention, the bulge at the tip of the lip is provided even if one of the pipes provided with the receiving port is inclined with respect to the other pipe provided with the receiving port. As a result, watertightness can be maintained as a result of close contact with the surface of the insertion tube, and therefore, it is suitable for use as, for example, a connection part of a sewer pipe.

Since it is not necessary to increase the thickness of the middle part of the lip, even if a bulge is provided at the tip of the lip, workability can be reduced without requiring a great deal of force when inserting the insertion opening. There is no danger of drop.

In the pipe connecting portion according to the present invention, even if the other pipe provided with the insertion port is inclined with respect to the one pipe provided with the receiving port, the tip of the lip portion is provided. Since the bulging portion comes into close contact with the surface of the insertion tube, watertightness can be maintained.

[Brief description of the drawings]

FIG. 1 is a front view of an upper half cutaway showing an example of a packing according to the present invention.

FIG. 2 is a front view of an upper half cutaway showing a use mode of the packing of the present invention shown in FIG.

FIG. 3 is an upper half cutaway front view showing a conventional pipe connection portion.

FIG. 4 is a cross-sectional view showing a main part of the conventional pipe connecting section shown in FIG. 3, in which one pipe is inclined with respect to the other pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing 11 Annular main body part 12 Lip part 13 Swelling part 2 One hard vinyl chloride resin pipe 21 Reception port 22 Concave groove 3 The other hard vinyl chloride resin pipe 31 Insert

Claims (2)

[Claims] A lip portion projects inward from one side of the annular main body portion, is a packing having a substantially U-shaped cross section, and a bulge portion is provided at a tip of the lip portion. And packing. 2. A pipe connecting part having an insertion port inserted into a receiving port, wherein the packing according to claim 1 is provided in the receiving port.