JPH11159673A - Universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fluid from leaking from a connecting part or underground water from infiltrating into a pipeline by forming a seal member of a universal joint where an end part of another pipe body is rotatably fitted/installed in an end part of a pipe body through the seal member, out of water expansive rubber bands. SOLUTION: A rubber band 61 is a cross-sectional V shape composed of a generally using nonexpansive rubber material. While, a rubber band 62 is formed of a water expansive rubber material containing a water absorptive synthetic resin. The rubber band 61 is installed in an annular cutout step part on the connecting end surface 31 side. The rubber band 62 is installed in an annular recessed groove on the outer periphery of a flange surface 32. There is a slight clearance between a female type flange surface 22 of a left side connecting short pipe 2 and the male type flange surface 32 of a right side connecting short pipe 3. The rubber bands 61 and 62 are arranged between both connecting end surfaces 21 and 31, and when the male type flange surface 32 is inserted into the female type flange surface 22, both connecting short pipes 2 and 3 can rotate with the axis as the center, and can also hold a water stop function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a universal joint.

[0002]

2. Description of the Related Art Various types of universal joints have been known for use in burying drainage pipes. For example, Japanese Unexamined Utility Model Publication No. 53-13632 and Japanese Utility Model Publication No. 58-9035 each include an outer tube and an inner tube each having a spherical joint, and a seal for sealing is formed on the inner peripheral surface of the spherical joint of the outer tube. A universal joint in which a spherical joint portion of an inner tube is fitted with a rubber ring interposed therebetween is described.

In Japanese Utility Model Publication No. Sho 60-11346 and Japanese Patent Publication No. Sho 61-53597, an end of a synthetic resin tube is formed into a spherical shell-shaped bulge, and both ends of a sphere are inserted into the bulge. A pipe insertion adapter having a spherical outer surface having a shape cut by a parallel surface is provided in the spherical shell-shaped bulging portion,
A universal joint for a synthetic resin pipe rotatably fitted via a rubber ring for sealing is described.

Further, in Japanese Utility Model Application Laid-Open No. 4-93591 and Japanese Utility Model Application Laid-Open No. 4-95384, a pair of connection short pipes having connection end faces inclined at a predetermined angle are brought into contact with each other to connect the connection short pipes. A universal joint which is rotatably connected about a central axis of the joint and has a sealing material between connection end faces is described. In this universal joint, when one of a pair of both connecting short pipes is relatively rotated, the contact point of the connecting end face inclined at a predetermined angle changes, so that the connecting angle of the connecting short pipe changes, and as a result, The angle of the outlet changes.

[0005]

However, in any of the above-mentioned universal (pipe) joints, the rubber ring (or sealing material) used for sealing is an ordinary mere rubber packing, so that it is buried and constructed. Due to the earth pressure or the ring load acting on the drainage pipe, a bending load or a compressive load usually acts on the universal (pipe) joint. As a result, the connection part is affected by flattening and bending, a part of the rubber packing is loosened, a gap is generated, and leakage occurs,
Therefore, there was a problem that the water stopping performance was reduced. In addition, there is a problem that groundwater infiltrates into the pipeline in reverse, which increases the amount of treatment at the sewage treatment plant and increases the treatment cost.

In the case of the universal joint described in Japanese Utility Model Laid-Open No. 4-93591 and Japanese Utility Model Laid-Open No. 4-95384,
There was a problem that rotation of both connecting short pipes did not go smoothly. By the way, this problem can be solved by loosening the joining between the two joining end faces, but on the contrary, there arises a problem that drainage leaks from between the joining end faces or groundwater infiltrates into the pipeline.

[0007] An object of the present invention is to provide a universal joint which does not leak fluid from between the connecting portions of both pipes, or conversely, groundwater does not infiltrate into the pipe, and is easy to rotate or rotate. To provide.

[0008]

According to a first aspect of the present invention, there is provided a flexible structure in which the end of one tube is rotatably fitted with the end of the other tube via a seal member. In the joint, the seal member is a water-swellable rubber ring.

According to a second aspect of the present invention, in the universal joint according to the first aspect, the two pipes are a pair of connecting short pipes having connecting end faces inclined at a predetermined angle, and the two connecting end faces are brought into contact with each other. Are connected rotatably about the central axis of the connecting short pipe.

According to a third aspect of the present invention, in the universal joint according to the second aspect, a concave female flange surface is formed on one of the pair of connection short tubes along the connection end surface. The other connecting short pipe is formed with a convex male flange surface which is inserted into the female flange surface along the connecting end surface, and has a water-swelling property between one connecting end surface and the other connecting end surface. A rubber ring is provided, a male flange surface is inserted into the female flange surface, and one connection end surface is moved toward the other connection end surface to press the rubber ring provided between the two connection end surfaces. The universal joint according to claim 2, further comprising a locking mechanism for locking in a state where the universal joint is locked.

According to a third aspect of the present invention, in the locking mechanism, one connection end face is moved in the direction of the other connection end face to lock the seal provided between the two connection end faces in a pressed state. However, there are various locking mechanisms. For example, a flange may be provided on each of the connection end surfaces, and the flanges on both of the connection end surfaces may be pulled together with a small vice to lock the seal provided between the connection end surfaces in a pressed state. That is, with the rotating lever, one connecting end face is moved in the direction of the other connecting end face, or one connecting end face is moved in the direction of the other connecting end face, and the locking material is moved to the side walls of the female flange and the male flange. The operation can be simplified by inserting the seal material into the hole provided and locking the seal material in a pressed state.

(Function) In the universal joint according to the first to third aspects of the present invention, the end of one of the pipes is inserted into the end of the other pipe via a seal member made of a water-expandable rubber ring. Since it is rotatably fitted, even after the buried construction, the sealing member absorbs water and expands even if the connection part is affected by flattening and bending due to the action of bending load and compression load, Since both tube surfaces are pressed, no gap is formed and the water stopping performance does not decrease. In addition, since infiltration of groundwater into the pipeline can be prevented, the treatment cost of the sewage treatment plant does not increase.

In addition, the compression elastic modulus at the time of installation, that is, the cross-sectional area of the seal member can be made slightly smaller than that of the conventional seal member, so that the assembly work of the universal joint and the installation work at the time of burying can be easily performed. .

[0014] In the universal joint according to the second aspect of the invention, the two pipes are a pair of connection short pipes having connection end faces inclined at a predetermined angle, and the two connection end faces are brought into contact with each other to make the center of the connection short pipe. Since the connection is made rotatable about the shaft, the operator can turn the universal joint with a small force.

In the universal joint according to the third aspect of the invention, one of the pair of connecting short pipes has a concave female flange surface formed along the connecting end face, and the other connecting short pipe. A convex male flange surface inserted into the female flange surface is formed along the connection end surface, and a water-expandable rubber ring is provided between one connection end surface and the other connection end surface, The male flange surface is inserted into the female flange surface,
A locking mechanism is provided for moving one connection end face in the direction of the other connection end face and locking the rubber ring provided between the two connection end faces in a pressed state, so that both connection short pipes are connected. After the relative rotation, the sealing mechanism provided between the two connection end surfaces is pressed by the locking mechanism, so that this portion can be satisfactorily stopped. Therefore, drainage does not leak from the connection part of the universal joint.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a first embodiment of the present invention, FIG. 2 is a partially cutaway front view showing a state where the universal joint shown in FIG. 1 is rotated about a central axis, and FIG. FIG.

1 and 2, reference numeral 1 denotes a universal joint made of a hard vinyl chloride resin. The universal joint 1 has a pair of connecting short tubes, that is, a left connecting short tube 2 and a right connecting short tube 3.
It consists of A concave female flange surface 22 is formed on the left connection short pipe 2 along the connection end surface 21. The female flange surface 22 has an outlet 25 formed as an insertion port on the opposite side. The right connection short pipe 3 is provided with a convex male flange surface 32 which is inserted along the connection end surface 31 with a slight gap in the female flange surface 22. On the opposite side of the male flange surface 32, an inflow port 35 formed of a receiving port is formed.

As shown in FIG. 3, the two connecting short tubes 2 and 3 are mounted around the male flange surface 32.
They are connected in a watertight manner via the rubber rings 61 and 62. Of these, the rubber ring 61 has a V-shaped cross section made of a generally used non-expandable rubber material. On the other hand, the rubber ring 62 is a water-swellable material, and is formed of a water-swellable rubber material containing a water-absorbing synthetic resin.

The rubber ring 61 is connected to the connection end face 3 of the right connection short pipe 3.
It is attached by bonding to an annular cutout step 33 formed on one side. On the other hand, the rubber ring 62 is mounted in an annular groove 34 formed on the outer periphery of the male flange surface 32 located between the notch 33 and the recess 8. Then, when the male flange surface 32 of the right connection short tube 3 is inserted into the female flange surface 22 of the left connection short tube 2, the female flange surface 22 of the left connection short tube 2 and the male flange surface of the right connection short tube 3 are inserted. Shaped flange surface 3
There is a slight gap between the two. Therefore, as shown in FIG. 2, the rubber rings 61, 62 are provided between the two connection end faces 21, 31.
When the male flange surface 32 is inserted into the female flange surface 22, the connecting short tubes 2 and 3 can be easily rotated about the central axis.

The connection end faces 22, 32 of the left connection short pipe 2 and the right connection short pipe 3 are inclined by an angle θ, and the left connection short pipe 2 or the right connection short pipe 3 is relatively positioned, and the center axis thereof is By rotating the universal joint 1
Can be bent at any angle within the range of 0 to 2θ.

Reference numeral 4 denotes an indicator line provided on the outer peripheral surface of the right connection short pipe 3 near the connection end face 31. Reference numeral 5 denotes a left connection short pipe 2.
5 is a scale showing an angle provided on the outer peripheral surface near the connection end surface 21 of FIG. The scale 5 indicating this angle is the left connecting short pipe 2
The same angle as the angle formed by the tube shaft on the right side of the tube shaft 3 is described. Accordingly, when the left connecting short pipe 2 or the right connecting short pipe 3 is relatively rotated and the indication line 4 is adjusted to a predetermined scale 5, the left connecting short pipe 2 and the right connecting short pipe 3 are bent at a predetermined angle. You can do it. The indication line 4 and the scale 5 are also provided on the outer peripheral surface on the opposite side of the right connection short pipe 3 and the left connection short pipe 2, so that the universal joint 1 can be installed with either of them installed. .

Reference numeral A denotes a locking mechanism. The locking mechanism A includes a rotating lever 7, an opening 71, and a depression 8. Four openings 71 are provided on the side wall of the female flange surface 22 at substantially equal intervals. The depression 8 is provided at a position facing the opening 71 on the outer peripheral surface of the male flange surface 32. The rotation lever 7 is rotatably mounted in the opening 71 so as to be rotatable in the central axis direction of the left connection short tube 2. Rotating lever 7
The distance between the tip surface 73 and the rotating shaft 72 on which the shaft is mounted is gradually changed.

Then, a part of the end face 73 of the rotating lever 7 is inserted into the recess 8 and the lever 7 erected in a direction substantially perpendicular to the central axis of the left connecting short tube 2 is tilted in the central axis direction. Rotation is performed about the rotation shaft 72 attached to the shaft, and the tip surface 73 of the rotation lever 7 in which the distance between the end surface 73 and the rotation shaft 72 is long presses the side wall of the recess 8. As a result, the right connection short pipe 3 moves to the left connection short pipe 2 side, the rubber ring 61 is pressed, and the space between the connection end face 21 of the left connection short pipe 2 and the connection end face 31 of the right connection short pipe 3 is increased. It is kept watertight.

Next, the mode of use of the universal joint 1 will be described. Measure the angle of the two drain pipes already installed. Next, the rotary lever 7 is set up in a direction substantially perpendicular to the central axis of the left connection short pipe 2, and the left connection short pipe 2 or the right connection short pipe 3 is relatively moved while looking at the indication line 4 and the scale 5. By rotating, the indicator line 4 is adjusted to the number on the scale 5 indicating the measured angle. At this time, since there is only one indication line 4, it is easy to match the indication line 4 with the scale 5 while looking at the indication line 4 and the scale 5, and there is no mistake. Since the rubber ring 62 is of a water-expandable type, its cross-sectional area can be made slightly smaller than that of a conventional non-expandable rubber ring, and the rotation of the left connection short pipe 2 or the right connection short pipe 3 can be performed easily. .

When the rotary lever 7 is set up, a short distance between the rotary shaft 72 of the rotary lever 7 and the front end surface 73 is in contact with the side wall of the recess 8, and the female flange surface 22 of the left connection short pipe 2 is formed. There is a slight gap between the left connecting short pipe 2 and the male flange surface 32 of the right connecting short pipe 3.
And the right connecting short pipe 3 are easily rotated.

Thereafter, the rotation lever 7 is lowered. Then, a portion where the distance between the rotation shaft 71 and the tip surface 73 is long comes into contact with the side wall of the recess 8.
Pushes the side wall of the male flange surface 32, and the right connection short pipe 3
Moves toward the female flange surface 22 of the left connection short pipe 2. As a result, the female flange face 22 of the left connecting short pipe 2 and the male flange face 3 of the right connecting short pipe 3
2 is pressed against the rubber ring 61 provided therebetween, and this portion becomes watertight. As described above, in the universal joint 1, the two connection short pipes 2 and 3 are relatively easy to rotate, and the two connection short pipes 2 and 3 are relatively easily rotated.
3 can be connected in a watertight manner.

Since the rubber ring 62 is of a water-expandable type, the rubber ring 62 expands due to contact with drainage or underground water and presses the female flange surface 22. But they will be connected in a watertight manner. Therefore, the connection end portions of the two connection short pipes 2 and 3 can be connected in a watertight manner by the rubber rings 61 and 62, so that leakage of drainage or intrusion of groundwater into the pipeline can be prevented.

Next, the outlet 25, which is the insertion port of the left connecting short pipe 2, is provided in the drain pipe on the left side, and the inlet 35, which is the receiving port of the short connecting pipe 3, is provided in the right drain pipe. Connect using the connection method. Then, since the angle between the pipe axis of the left connection pipe 2 of the universal joint 1 and the pipe axis of the right connection short pipe 3 is set to the angle of the drain pipe, the connection can be easily performed without any trouble.

In the above embodiment, the case where the already connected drainage pipe is connected has been described. However, one drainage pipe may be connected and another drainage pipe may be connected ahead. In this case, the universal joint 1 is attached to the tip of the drain pipe already piped, and the angle is adjusted.
Another drain pipe may be connected. At that time, when the universal joint 1 is attached to the end of the drain pipe already piped,
It is unclear which side wall of the universal joint 1 faces upward, but in the above embodiment, since the indicator line 4 and the scale 5 are provided on both sides, the indicator line 4 and the scale 5 are difficult to see. There is no.

In the above embodiment, an annular concave groove 34 is formed between the notch step 33 on which the rubber ring 61 is mounted and the recess 8, and a water-swellable rubber ring 62 is formed in the concave groove 34. Although the secondary seal is performed by attaching the groove, the concave groove 34 and the rubber ring 62 may not be provided. In this case, the rubber ring 61 may be made of a water-swellable material.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the present invention. In the figure, reference numeral 1A denotes a universal joint made of hard vinyl chloride resin, a joint short tube 2A and a spherical core 3A for tube insertion.
It consists of One end of the joint short tube 2A is formed in a spherical shell-shaped bulging portion 21A, and the spherical core 3A is rotatably fitted in the bulging portion 21A. The spherical core 3A has a shape obtained by cutting both ends of a spherical body, and has an annular concave groove 33A formed on a spherical outer peripheral surface 31A and an annular concave groove 34A formed on an inner peripheral surface 32A. . And
A water-expandable rubber ring 62A is mounted on the concave groove 33A, and a generally used non-expandable rubber ring 61A is mounted on the concave groove 34A. It should be noted that an annular locking projection is formed at the back of the inner peripheral surface 32A. Then, as shown in FIG. 4, the connection pipe 4A is inserted and connected into the spherical core 3A via the rubber ring 61A.

Also in the case of the second embodiment, since the rubber ring 62A is of a water-expandable type, its cross-sectional area can be made slightly smaller than that of a conventional non-expandable rubber ring, and Forcibly fitting the spherical core 3A and adjusting the insertion connection angle of the connection tube 4A can be easily performed. Since the rubber ring 62A is water-expandable, the rubber ring 62A expands due to contact with drainage or groundwater, and presses the inner surface of the bulging portion 21 of the joint short pipe 2A. Outer part 21A
The connection surface between the inner surface and the outer surface of the spherical core 3A can be connected in a watertight manner, thereby preventing leakage of drainage or intrusion of groundwater into the pipeline.

The type of the universal joint in the present invention is not limited to those of the first and second embodiments, but can be applied to the type described in the above-mentioned prior art.

The universal joint is made of synthetic resin,
It may be made of metal, concrete, or ceramic.

[0035]

In the universal joint according to the first aspect of the present invention, the end of one tube is rotatable via a seal member made of a water-expandable rubber ring. After buried, even if the connection part is affected by flattening or bending due to the action of bending load or compression load, the sealing member absorbs water and expands, and both pipe surfaces , No gap is formed, and the water stopping performance does not decrease. In addition, since the infiltration of groundwater into the pipeline can be prevented,
The treatment cost of the sewage treatment plant will not increase.

In addition, the compression elastic modulus at the time of mounting, that is, the cross-sectional area of the seal member can be made slightly smaller than that of the conventional seal member, so that the assembling work of the universal joint and the installation work at the time of burying can be easily performed. .

[0037] In the universal joint according to the second aspect of the invention, the two pipes are a pair of connecting short pipes having connecting end faces inclined at a predetermined angle. Since the connection is made rotatable about the shaft, the operator can turn the universal joint with a small force.

In the universal joint according to the third aspect of the present invention, one of the pair of connecting short tubes has a concave female flange surface formed along the connecting end face, and the other connecting short tube. A convex male flange surface inserted into the female flange surface is formed along the connection end surface, and a water-expandable rubber ring is provided between one connection end surface and the other connection end surface, The male flange surface is inserted into the female flange surface,
A locking mechanism is provided for moving one connection end face in the direction of the other connection end face and locking the rubber ring provided between the two connection end faces in a pressed state, so that both connection short pipes are connected. After the relative rotation, the sealing mechanism provided between the two connection end faces is pressed by the locking mechanism, so that this portion can be watertightly stopped. Therefore, no drainage leaks from the connection part of the universal joint, and no groundwater enters the pipeline.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a use state of the universal joint of FIG. 1;

FIG. 3 is an enlarged sectional view showing a main part of FIG.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Universal joint 2 Left connection short pipe 21 Connection end face 22 Female flange face 3 Right connection short pipe 31 Connection end face 32 Male flange face 62 Water-expandable rubber ring 8 Depression

Claims (3)

[Claims] 1. A universal joint in which one end of one tube is rotatably fitted with the end of the other tube via a seal member, wherein the seal member is a water-expandable rubber ring. A universal joint, characterized in that: 2. A pair of connecting short tubes each having a connecting end surface inclined at a predetermined angle, wherein both connecting end surfaces are brought into contact with each other so as to be rotatable about a central axis of the connecting short tube. The universal joint according to claim 1, wherein 3. One of the pair of connecting short tubes has a concave female flange surface formed along the connecting end surface, and the other connecting short tube has the female female flange surface along the connecting end surface. A convex male flange surface to be inserted into the flange surface is formed,
A water-swellable rubber ring is provided between one connection end face and the other connection end face, and the male flange face is inserted into the female flange face, and one connection end face is moved in the direction of the other connection end face. 3. The universal joint according to claim 2, further comprising a locking mechanism for locking the rubber ring provided between the two connection end surfaces in a pressed state.