JPH0736227Y2 - Flexible joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flexible joint used for connecting pipes to each other or connecting a pipe to a manhole.

(Prior Art) Generally, as a flexible joint used for connecting pipes to each other, for example, a joint as disclosed in Japanese Utility Model Publication No. 2-21389 is known. That is, as shown in FIG. 9, this flexible joint a has insertion portions for inserting pipes b at both ends.
c, c is provided, and a flexible portion d is provided in the center portion. A ridge e protruding from the inner peripheral surface of the flexible portion d is used to reinforce the diametrical direction, and the ridge e The groove f between them and the groove g provided in the insertion portions c, c enhance the flexibility in the axial direction.

Further, it is also considered to cut a spiral tube rich in elasticity and flexibility as seen in, for example, Japanese Utility Model Laid-Open No. 1-75682 and use it as a flexible joint. That is, as shown in FIG. 10, the spiral tube h has a fitting portion j at one side edge, which is bifurcated and in which the retaining portions i, i are provided opposite to each other at the inner edge of the opening end, and the other side edge In addition, a strip-shaped synthetic resin profile 1 having a locking portion k slidably fitted and locked in the fitting portion j is spirally wound, and the fittings adjacent to each other in a wound state are provided. The joining portion j and the engaging portion k are fitted together to form a tubular shape. And the fitting part j
A water blocking material m made of an elastic body is lined at a portion of the retaining portions i, i that is in contact with the locking portion k at least on the outer peripheral side in the wound state. This prevents water from penetrating from the outer circumference of the spiral tube h to the inner circumference of the spiral tube h through the space n in the fitting portion j, and
It has elasticity and flexibility.

(Problems to be solved by the invention) However, in the above-mentioned conventional flexible joint a, the flexibility is improved by the groove f between the ridges e and the groove g provided in the insertion portions c, c. However, the flexible joint a is bent by the elasticity of the material forming the flexible joint a. Therefore, in the state where the pipe b connected by the flexible joint a is buried, if uneven settlement due to an earthquake or the like occurs, the flexible joint a cannot sufficiently follow. That is,
When the flexible joint a has a bending angle of a certain value or more, there is a problem that the flexible joint a is broken and the pipe b is pulled out from the flexible joint a beyond the limit of bending due to elastic deformation. Will occur. Further, when the flexible joint a is connected between the pipes b and b, the distance between the pipes b and b is
The length must be surely set.

On the other hand, when the conventional spiral tube h is used as a flexible joint, in the spiral tube h, the fitting part between the adjacent fitting part j and the engaging part K is easily bent by input, This causes a disadvantage such as lack of bending rigidity.

The present invention has been made in view of such circumstances, and an object thereof is to provide a flexible joint that has sufficient bending rigidity and can take a sufficient bending angle.

(Means for Solving the Problem) The flexible joint of the present invention has a fitting portion having a bifurcated shape and a retaining portion facing the inner edge of the opening end at one side edge, and the other side edge having the fitting portion. A plurality of synthetic resin short pipes each having a locking portion slidably fitted and locked in the fitting portion, and a fitting portion or a locking member having the same shape as the fitting portion or the locking portion at both end edges. A ring-shaped connecting member having a portion, a receiving portion having a shape corresponding to an object to be connected at one end edge, and a fitting portion or locking portion having the same shape as the fitting portion or locking portion at the other end edge. And a fitting body having a fitting portion, and the short pipes are connected by fitting the fitting portion and the locking portion to each other to form a joint body, and fitting of both ends of the joint body is performed. The fitting part or the locking part is attached by fitting the fitting part or the locking part of the receiving member,
Further, a tubular body made of an elastic body is attached to at least one of the outer circumference and the inner circumference of the joint body.

(Operation) The flexible joint of the present invention has a fitting portion having a forked shape at one side edge and a retaining portion facing the inner edge of the opening end, and sliding at the other side edge into the fitting portion. A synthetic resin short tube having a locking part that can be fitted and locked as much as possible, an annular connecting member having a fitting part or a locking part of the same shape as the fitting part and the locking part, and the fitting part or Since the fitting portion having the same shape as the locking portion or the receiving member having the locking portion is coupled by fitting the mutual fitting portion and the locking portion, for bending, The sliding movement of the locking portion in the fitting portion will be smoothly performed. Further, since the tubular body made of the elastic body is attached to at least one of the outer circumference and the inner circumference of the joint body, the tubular body ensures the rigidity and the waterproofness.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the overall configuration of the flexible joint 1.

That is, a plurality of flexible joints 1 (4 in the illustrated example
Individual) short tubes 2 made of synthetic resin, an annular connecting member 3 and a receiving member 4, and the synthetic resin short tubes 2 are connected to both ends of the annular connecting member 3 to form a joint body 10. At the same time, the fitting members 10 are attached to both ends of the fitting body 10 by fitting, respectively, and the tubular body 5 made of an elastic body is attached to the outer circumference of the fitting body 10. is there.

As shown in FIG. 2, the short tube 2 made of synthetic resin has a tubular shape, and its cross-sectional shape is bifurcated at one end edge and stopper portions 21, 21 are provided opposite to each other at the inner edge of the open end. A locking part having a fitting part 22 and slidably fitted and locked in the fitting part 22 at the other end edge.
It is formed in a shape having 23. As a material for the short tube 2 thus formed, for example, a hard vinyl chloride resin having an excellent balance of rigidity, flame retardancy, heat resistance, economical efficiency, etc. is preferably used. It may be fluorinated ethylene, polyamide, polyacetal, polyethylene or the like.

The shape of the synthetic resin short pipe 2 is not limited to that shown in FIG. 2, and the fitting portion 22 and the fitting portion 22 are slidably fitted and locked. As long as it can form the locking portion 23, the one shown in FIG. 3 can be used.

As shown in FIG. 4, the ring-shaped connecting member 3 is ring-shaped and its cross-sectional shape is such that the synthetic resin short pipe 2 is formed at both end edges.
It is formed in a shape having a locking portion 33 having the same shape as that of the locking portion 23. As the material of the annular connecting member 3 thus configured, the same material as the synthetic resin short pipe 2 is used.

Then, the joint main body 10 is formed by connecting the required number of synthetic resin short pipes 2 to both ends of the annular connecting member 3 thus configured. In this connecting work, the fitting portions 22 of the synthetic resin short pipe 2 are forcibly fitted into the locking portions 33 at both ends of the annular connecting member 3 and then the synthetic resin short pipe 2 is fitted. The fitting portion 22 of the other short tube 2 made of synthetic resin is forcibly fitted into the engaging portion 23 of the other synthetic resin short tube 2 to force the fitting. This work may be done at the connection stage or at the construction site.

The shape of the annular connecting member 3 is not limited to the one in which the engaging portion 33 having the same shape as the engaging portion 23 of the synthetic resin short pipe 2 is formed as shown in FIG. If it can be connected to the synthetic resin short pipe 2,
For example, as shown in FIG. 5, it is also possible to use a synthetic resin short pipe 2 in which a fitting portion 32 having the same shape as the fitting portion 22 is formed.

As shown in FIG. 6, the socket member 4 has a fitting portion 42 having the same shape as the fitting portion 22 of the synthetic resin short pipe 2 at one end edge, and is connected to the other end edge. The connecting portion 44 has a shape corresponding to the object 6. As the material of the receiving member 4 thus configured, the same material as the synthetic resin short tube 2 is used.

Then, the socket member 4 thus configured is the same as the joint body 10 described above.
The fitting portions 42 of the receiving member 4 are forcibly fitted into the engaging portions 23, 23 at both ends thereof to be connected to each other.

The shape of the receiving member 4 is not limited to the one in which the fitting portion 42 of the same shape as the fitting portion 22 of the synthetic resin short pipe 2 is formed as shown in FIG. However, as long as it can be connected to the synthetic resin short pipe 2, for example, as shown in FIG. 7, a locking portion 43 having the same shape as the locking portion 23 of the synthetic resin short pipe 2 is formed. It is also possible to use the prepared one.

The tubular body 5 is attached to the outer peripheral surface of the joint body 10 so as to cover these connecting portions. The tubular body 5 which becomes like this
As the material of ethylene-vinyl acetate copolymer (EV
A), soft vinyl chloride resin (PVC), elastic materials such as rubber are used.

It should be noted that the tubular body 5 is not limited to being fitted to the outer peripheral surface of the joint main body 10, but is attached to the inner peripheral surface of the joint main body 10 as shown in FIG. It may be one. However, it must be mounted so as not to move in the axial direction of the joint body 10. Further, as shown in the figure, the joint body 10 may be configured by connecting a plurality of synthetic resin short pipes 2 in the same direction without using the annular connecting member 3.

(Effects of the Invention) As described above, according to the present invention, when bending,
Since the sliding movement of the locking portion in the fitting portion is smoothly performed, the bending angle can be increased. Further, since the rigidity and the water stop are ensured by the tubular body, sufficient bending rigidity and water stop can be obtained.

[Brief description of drawings]

1 to 8 are drawings according to the present invention.
The figure is a partially broken side view showing the outline of the overall structure of the flexible joint,
2 is a partially enlarged cross-sectional view showing the outline of the overall structure of the synthetic resin short pipe, FIG. 3 is a partially enlarged cross-sectional view showing another shape of the synthetic resin short pipe, and FIG. 4 is an annular connecting member. FIG. 5 is a partially enlarged cross-sectional view showing the outline of the overall configuration, FIG. 5 is a partially enlarged cross-sectional view showing another shape of the annular connecting member, and FIG. 6 is a partially enlarged cross-sectional view showing the overall configuration of the receiving member. FIG. 7 is a partially enlarged cross-sectional view showing another shape of the socket member, FIG. 8 is a partially cutaway side view showing another embodiment of the flexible joint, and FIG. 9 is a partially cutaway view showing a conventional flexible joint. A side view and FIG. 10 are partially cutaway side views showing an outline of the overall configuration of a spiral tube that has been conventionally used as a flexible joint. 1 …… Flexible joint 10 …… Coupling body 2 …… Synthetic resin short pipe 21 …… Prevention part 22 …… Mating part 23 …… Locking part 3 …… Ring connection member 32 …… Mating part 33… … Locking part 4 …… Receiving member 42 …… Fitting part 43 …… Locking part 44 …… Connecting part (receiving part) 5 …… Cylindrical body 6 …… Connected object

Claims (1)

[Scope of utility model registration request] 1. A fitting portion having a bifurcated shape and a retaining portion provided opposite the inner edge of the opening end is provided at one side edge, and slidably fitted and locked at the other side edge in the fitting portion. A plurality of short pipes made of synthetic resin having locking parts, and annular connecting members having fitting parts or locking parts of the same shape as the fitting parts or locking parts at both ends, and one end edge, A socket member having a shape corresponding to an object to be connected, and a socket member having a fitting portion or a locking portion having the same shape as the fitting portion or the locking portion at the other end edge, At both ends of the annular connecting member, a plurality of synthetic resin short pipes are connected by fitting the fitting portion and the locking portion to each other to form a joint body, and at the both ends of the joint body. The fitting part or the locking part is attached by fitting the fitting part or the locking part of the receiving member, and the outer circumference of the joint body or Circumference of at least one, flexible joint tubular body made of elastic material, characterized in that mounted.