JPH0144875Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint used to connect pipes together.

As this type of pipe joint, a so-called socket has been known in the past. This was composed of a cylindrical body with connection ports at both ends that fit into each end of two pipes to be connected to each other, so naturally the diameter of the connection ports was could not be changed as needed.

However, when constructing and maintaining culvert drainage pipes and other types of piping, it is common to use pipes of various diameters, taking into consideration their drainage capacity, etc., and to use pipe fittings. The diameters of the two pipes to be connected are not always the same, and sometimes it is necessary to connect a small diameter pipe and a large diameter pipe.

To deal with this, it is necessary to prepare a variety of pipe fittings that have two connection ports of the same diameter and different diameters as pipe fittings for connecting two pipes of the same diameter. In order to connect two pipes of different diameters, it is necessary to prepare a variety of pipe joints whose connecting ports at both ends have different diameters. Therefore, it is necessary to prepare a wide variety of pipe fittings with respect to the diameter of the connection port, but in reality, it is necessary to prepare a wide variety of pipe fittings that can completely handle the construction and maintenance of the various piping mentioned above. is accompanied by various difficulties.

This difficulty is particularly significant when the tubes are not standardized. In other words, if the pipe is standardized, the pipe diameter will be as indicated no matter what manufacturer it is made from, so prepare a pipe fitting that has a connection port with a diameter that corresponds to the standard. However, in cases where pipes are not standardized, such as underdrain drainage pipes, there may be relatively large dimensional differences in pipe diameter between manufacturers even if the diameter is the same. It's normal. Therefore, even if pipe joints with connection ports of various diameters are prepared as described above, it is currently impossible to connect two pipes from different manufacturers.

This invention was made in view of the above circumstances, and the diameter of the connection port at both ends of the pipe joint is adjusted separately for each side.
Alternatively, the purpose is to enable two pipes to be connected regardless of their pipe diameters by making it possible to change both.

The pipe joint according to the present invention, which was made for the above purpose, has a spirally or spirally wound band provided with a curl, and a connecting port formed at the starting end of the band and a terminal end. The gist is that the diameter of the connection port formed on the side is set smaller than the outer diameter of the two pipes to be connected using the pipe joint.

The present invention will be described below with reference to illustrated examples.

In the pipe joint 1 illustrated in FIG. 1, a band 11 made of plastic or metal is wound in a spiral shape with its widthwise ends wrapped, and in this wound state, the band 11 A winding pattern is applied to the starting end 11a of the band 11.
The diameters of the connection port 13 formed on the side and the connection port 14 formed on the terminal end 11b side are set smaller than the outer circumferential diameter of the two pipes to be connected using the pipe joint 1.

Such a pipe joint 1 can be easily extended by holding the starting end 11a and the terminal end 11b of the band member 11 by hand and pulling them in the axial direction A. Conversely, by pushing the starting end 11a and the ending end 11b of the band 11, it can be easily shortened. Furthermore, the band 11
When the starting end 11a of the band member 11 is unwound in the counter-winding direction (arrow B ₁ ), the connection port ₁₈ of the pipe joint 1 is expanded in diameter. ), the connection port 14 of the pipe joint 1 is expanded in diameter. Moreover, since the band 11 is provided with a curl, the band 11 has an elastic restoring force. Therefore, if you release your hands from the starting end 11a and the terminal end 11b of the band 11 after expanding or contracting the pipe fitting 1 or expanding the diameter of the connection ports 13 and 14 as described above, the length of the pipe fitting 1 and the connection ports 13 and 14 will change. The caliber is restored to its natural state.

FIG. 2 shows a state in which two pipes 3 and 4 are connected by the pipe joint 1 described above. That is,
One connection port 13 of the pipe joint 1 is externally fitted onto the pipe 3. In this state, the connecting port 13 has a larger diameter than in its natural state, so the elastic restoring force of the band 11 causes the starting end of the band 11 to elastically wrap around the pipe 3 over a certain length. It is in a state of Similarly, regarding the other connection port 14 externally fitted onto another tube 4, the terminal end portion of the band 11 is elastically wrapped around the tube 4 over a certain length. Therefore, the two pipes 3 and 4 are connected by the pipe joint 1. In this case, it is possible to adhere the portions of the band 11 that wrap around the tubes 3 and 4 to the tubes 3 and 4 with adhesive, respectively, or to adhere the wrap portion 12 of the band 11 with the same adhesive. By doing so, there is an advantage that the bonding force between the pipe joint 1 and the pipes 3 and 4 and the strength of the pipe joint 1 itself are increased.

Here, it goes without saying that when one connection port 13 of the pipe joint 1 is fitted into the pipe 3, the diameter of the connection port 13 needs to be enlarged to be larger than the pipe diameter of the pipe 3. When the other connection port 14 of the pipe joint 1 is fitted into the pipe 4, the diameter of the connection port 14 is similarly enlarged to be larger than the diameter of the pipe 4. In addition, when fitting the connection ports 13 and 14 to the pipes 3 and 4, respectively, in this way, there are cases in which the opposing distance between the pipes 3 and 4 is larger and smaller than the length dimension of the pipe fitting 1 in the natural state. There is. In such a case, the pipe joint 1 is lengthened or shortened as necessary in the manner described above. Although FIG. 2 shows a case where the two tubes 3 and 4 have different diameters, the same applies even if they are the same.

In the pipe joint 1 shown in FIG. 1, the width direction of the band member 11 and the axis X-X are parallel to each other as shown in the drawing, so the band member 11 is wound in a wrapped manner. Because of this relationship, the diameters of the two connection ports 13 and 14 are necessarily different, and the difference in diameter increases as the number of turns increases. Therefore, when constructing a pipe joint with a large amount of expansion and contraction, it may be difficult to make both the two connection ports 13 and 14 smaller in diameter than the pipes to be connected.

There is a pipe joint 1 illustrated in FIG. 3 that does not cause such difficulties. That is, this pipe joint 1 is obtained by winding a band 11 in a spiral shape with its width direction slightly inclined with respect to the axis XX. According to this, even if the band 11 is wrapped and wound, the difference in diameter between the two connection ports 13 and 14 remains constant regardless of the number of turns, so the above-mentioned difficulty is eliminated.

FIG. 4 shows another embodiment. In this embodiment, a convex line 15 provided along one end of the band 11 in the width direction is fitted with a grooved line 16 provided along the other end of the band 11 in the width direction. be. According to this, when the connecting ports 13 and 14 are expanded in diameter or contracted due to the elastic restoring force of the band member 11, the sliding of the lap portion is caused by the fitting portion between the above-mentioned convex line 15 and concave line 16. Since it is thus guided, not only can the action be carried out smoothly, but also the strength of the pipe joint 1 is increased because the protrusions 15 and grooves 16 also serve as reinforcing ribs. Other points are the same as those explained in FIG.

In addition to the above-mentioned protrusions 15 shown in FIG. 4, they may be solid as shown in FIG. 5A, or may be square as shown in FIG. However, in these cases, it is desirable that the shape of the grooved line 16 be similar to the corresponding protruding line 15, as shown in A, B, and C of the figure.

FIG. 6 shows yet another embodiment. The pipe joint 1 according to this embodiment has a band 11 wound in a spiral shape, and when in use, the starting end 11a of the band 11 is pulled out to make the wound state spiral, similar to the above-mentioned one. Use in the same manner. According to this, there is an advantage that the pipe joint 1 becomes compact.

As is clear from the detailed explanation above, in the pipe joint according to the present invention, the diameter of the connection port can be freely changed according to the diameters of the two pipes to be connected, so whether the pipes are standardized or not. It can be used regardless of whether the two tubes have the same diameter or different diameters. Therefore, it is no longer necessary to prepare a wide variety of pipe joints as in the past, making inventory management easier and responding quickly and easily at construction sites and customer sites.

In particular, the pipe joint according to the present invention is useful as a pipe joint for underdrain drainage pipes where strict sealing performance is not required. Note that the pipe fittings of this invention can be used with PP, PE, PVC,
It is preferable to use hard plastic such as FRP, but it can also be made from a thin metal plate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pipe joint according to an embodiment of the present invention;
Fig. 2 is a side view showing its usage, Fig. 3 is a side view showing a modification of the pipe joint, Fig. 4 is a partial sectional view of a pipe joint according to another embodiment, and Fig. 5 is a modification thereof. FIG. 6 is a sectional view showing a main part of the pipe joint according to still another embodiment. 1...Pipe joint, 11...Band body, 11a...Start end of band body, 11b...Terminal end of band body, 13, 14...
Connection.

Claims (1)

[Scope of utility model registration request] The belt is wound in a spiral or spiral shape and has a winding pattern, and the diameter of the connection port formed at the beginning end of the belt and the connection port formed at the end end of the belt are the same as the pipe fitting. A pipe fitting that is set to be smaller than the outer diameter of the two pipes that are connected using the pipe fitting.