JP2851250B2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting pipes by combining two half-cylinder members.

[0002]

2. Description of the Related Art In recent years, plastic pipes have been frequently used as protection pipes for electric wires and cables and drain pipes for culverts.
Such pipes include straight pipes and spiral-wound pipes with spiral waves (the peaks and valleys of the waveform appear to be tilted with respect to the axial direction); There is a corrugated pipe. Conventionally, cylindrical pipe joints have been used for connecting these pipes. However, since connection work of a cylindrical pipe joint is troublesome, recently, a pipe joint of a type in which a part where ends of pipes to be connected are abutted by two half-cylinder members has been proposed.

FIGS. 9 and 10 show the basic structure of this type of pipe joint. This pipe joint is constituted by two half-cylinder members 10 and 20 that cover the pipe 30 to be connected by half a circumference.
Each of the half-cylinder members 10 and 20 has a packing layer 32 made of an elastomer provided on the inner surface of a hard resin molded body. The half-cylinder members 10 and 20 are provided with connecting portions on the both side edges with the counterpart.

[0004]

The connecting portion of the conventional pipe joint comprises a first connecting means 11 in the form of a protruding edge, and a second connecting means 21 in the form of a hook hooked on the first connecting means 11. An inclined surface 53 that terminates on the locking surface 22 side is formed at an end of the two coupling means 21. In a pipe joint having such a connecting portion, the engaging surface 12 of the first connecting means 11 and the engaging surface 22 of the second connecting means 21 are brought into an assembled state by engaging with each other. By the way, in such a pipe joint, as shown in FIG.
When the assembly 20 is in an incompletely assembled state, the second coupling means 21 is already strongly sandwiched by the first coupling means 11 at this point, so that it is not possible to distinguish whether the assembly of the pipe joint is complete or incomplete. . Therefore, in such a pipe joint, the operator mistakenly thinks that the assembly is complete in the state shown in FIG. 11 and ends the work in the middle of the assembly, which causes a fitting failure of the pipe joint. SUMMARY OF THE INVENTION The present invention has been made as a result of intensive studies in view of the above-mentioned problems of the related art, and an object of the present invention is to provide a pipe joint capable of preventing a poor fitting due to an erroneous assembly operation.

[0005]

According to the first aspect of the present invention, the pipe joint includes a first connecting means and a second connecting means as connecting parts, and ends of the first and second connecting means. Are formed with a first inclined surface 13 and a second inclined surface 23 that terminate on the side of the locking surfaces 12 and 22, respectively. At least one of the inclined surfaces 22 and 23 that are formed in a convex curved surface.

In the pipe joint according to a second aspect, as shown in FIG. 1, the first and second inclined surfaces 13, 23 are in contact with each other and hold the other half-cylinder members 10, 20 therebetween. The stop angle 26 extends from the second inclined surface 23 of the second coupling means 21 to the distal end side.

[0007] The pipe joint of the present invention can be used as a straight pipe joint if the inner peripheral surface is formed so as to correspond to the outer peripheral surface of the straight pipe. If it is formed so as to correspond to the surface, the joint of the spiral corrugated pipe,
It can be used as a joint for independent wave corrugated pipes.

[0008] In the pipe joint of the present invention, it is desirable to form a convex portion 41 and a concave portion 42 serving as positioning when the two half cylinder members are combined on the mating surface 14 of the half cylinder member with the other side. In this case, the two half-cylinder members cannot be connected unless the convex portion 41 and the concave portion 42 are fitted, and if the convex portion 41 and the concave portion 42 are fitted, the two half-cylindrical members are accurately positioned. As a result, it is possible to easily and reliably obtain a proper connection state in which the shapes of the inner peripheral surfaces of the two half cylinder members are continuous.

[0009]

According to the first aspect of the present invention, as the coupling portion, the connecting portion is closer to the mating surface 14 of the half-cylinder members 10 and 20, so that the closer to the first locking surface 12, the farther from the center of the half-cylinder members 10 and 20. The first coupling means 11 having the first inclined surface 13 that is inclined, and the opposite side of the mating surface 14 of the semi-cylindrical members 10, 20, the closer to the second locking surface 22, the closer to the center of the semi-cylindrical members 10, 20. Coupling means 2 having a second inclined surface 23 inclined to
1 is provided. Therefore, as shown in FIG.
3 is sandwiching the first inclined surface 13, that is, when the pipe joint is in an incompletely assembled state, the inclined surface 13,
A force acts in a direction in which the members 23 repel each other (a direction opposite to the direction in which they are fitted). And the half-cylinder member 1
0, 20 are separated and the mating surface 14 of the half-cylinder members 10, 20
A large gap between them allows a clear distinction between a complete or incomplete assembly of the fitting.

[0010] As in the pipe joint of claim 1, the inclined surfaces 13, 2
When 3 is provided, when assembling the half-cylinder members 10 and 20,
Sliding inward on the inclined surfaces 13, 23, the half-cylinder members 10, 20
However, the pipe joint of claim 2 has a temporary fixing angle 26 extending from the second inclined surface 23 of the second coupling means 21 to the tip end side as shown in FIG. The sliding on the inclined surfaces 13 and 23 is
6 is prevented.

[0011]

【Example】

(Embodiment 1) FIGS. 1 to 4 show an embodiment of the present invention.
This pipe joint connects the spirally corrugated pipe 30 and includes two half-cylinder members 10 and 20 that cover the spirally corrugated pipe 30 by a half circumference.
Combination of The two half-cylinder members 10 and 20 have the same shape, and are combined with the directions of both ends reversed. FIGS. 1 and 2 show a state before the spiral wave tube 30 is connected,
3 and 4 show the state after connection. Each of the half-cylinder members 10 and 20 is made of a hard resin molded body, for example, polypropylene, and has an inner surface formed with ridges at the same pitch as the valleys 31 on the outer peripheral surface of the spiral wave tube 30. A thermoplastic elastomer, for example, having a hardness of JI
A packing layer 32 made of SA 20 styrene-butylene-based thermoplastic elastomer is formed.

On both side edges of the half-cylinder members 10 and 20, connecting portions with the counterpart are provided. This connecting portion includes a first connecting means 11 and a second connecting means 21 which engage with each other. The first coupling means 11 is in the form of a protruding edge projecting laterally of the half-cylinder member 10. The first connecting means 11 is formed continuously in the longitudinal direction of the half-cylinder member 10. The first connecting means 11 has a first locking surface 12 which locks with a locking surface 22 of a second connecting means 21 described later when the half-cylinder members 10 and 20 are assembled. Further, the first coupling means 1
The reference numeral 1 denotes the first locking surface 12, which is closer to the mating surface 14 of the semi-cylindrical members 10 and 20 than the first locking surface 12.
And a first inclined surface 13 inclined away from a center line A perpendicular to the center line A. In this example, the first inclined surface 13 is a convex curved surface.

The second coupling means 21 is in the form of a hook which is hooked on the first coupling means 11 in the form of a protruding edge. The second coupling means 21 is formed at a position closer to one end side from the longitudinal center of the half-cylinder member 20. When the semi-cylindrical members 10 and 20 are assembled, the second coupling means 21 engages with the first engagement surface 12 and the second engagement surface 2.
Two. Further, the second coupling means 21 is inclined with respect to the second locking surface 22 on the side opposite to the mating surface 14 of the half-cylinder members 10 and 20 so as to be closer to the center line A as the second locking surface 22 is approached. The second inclined surface 23 is formed. In this example, the second inclined surface 23 is also a convex curved surface. Further, a temporary fixing angle 26 extends from the second coupling means 21 to the distal end side from the second inclined surface 23. A window 27 is formed in the extension 25 connecting the second engagement surface 22 of the second coupling means 21 and the mating surface 14 so that the position of the end surface of the first engagement surface 12 can be visually recognized from the outside. ing.

In this pipe joint, a convex portion 41 and a concave portion 42 for positioning when joining the two half-cylinder members 10 and 20 are formed on the mating surface 14 of the hard resin molded body with the counterpart. The convex portion 41 and the concave portion 42 are formed symmetrically with respect to a plane passing through the center in the longitudinal direction of the hard resin molded body and perpendicular to the axis of the pipe joint. For this reason, when the two half-cylinder members 10 and 20 are combined with the directions of both ends reversed, the convex portion 41 and the concave portion 42 are fitted to each other. In other words, if the two half-cylinder members are combined so that the convex portion 41 and the concave portion 42 are fitted, an appropriate connection state can be obtained. That is, the two half-cylinder members can be assembled so that the ridges and valleys on the inner peripheral surface are continuous.

The pipe joint according to the present embodiment includes a first coupling means 11,
The second connecting means 21 includes the first inclined surface 13 and the second inclined surface 2.
3 Therefore, as shown in FIG. 5, when the second inclined surface 23 is sandwiching the first inclined surface 13, that is, when the pipe joint is in an incompletely assembled state, the inclined surfaces 13, 23
A force acts in a direction in which they repel each other (a direction opposite to the direction in which they are fitted). And the half-cylinder member 1
0, 20 are separated and the mating surface 14 of the half-cylinder members 10, 20
A large gap between them allows a clear distinction between a complete or incomplete assembly of the fitting. In this example, since the inclined surfaces 13 and 23 are convex curved surfaces, the abutting portions of the two are linear without the two abutting on the surface, and the above effect is more exhibited.

If the inclined surfaces 13 and 23 are provided as in this pipe joint, when assembling the half-cylinder members 10 and 20, the half-cylinder members 10 and 20 cross each other by sliding laterally on the inclined surfaces 13 and 23. Although the assembling work becomes difficult, the temporary joint angle 26 of the pipe joint of the present embodiment extends from the second inclined surface 23 of the second coupling means 21 to the distal end side, as shown in FIG. The first connecting means 11 can be held down by the temporary fixing angle 26, and the sliding on the inclined surfaces 13 and 23 can be suppressed by the temporary fixing angle 2
6 is prevented.

Furthermore, the second locking surface 22 of the second coupling means 21
A window portion 27 is formed in an extension portion 25 connecting the contact surface 14 and the mating surface 14. Therefore, the position of the end surface of the first locking surface 12 can be confirmed from the window 27, and the assembled state can be visually confirmed.

(Embodiment 2) FIGS. 7 and 8 show another embodiment of the present invention. Differences between the first embodiment and the present embodiment will be described below. This pipe joint connects the independent wave corrugated pipes 30 and includes two half-cylinder members 1 covering the independent wave corrugated pipes 30 by half a circle.
It consists of a combination of 0 and 20. 7 and 8 show a state before the independent wave corrugated tube 30 is connected. Half cylinder member 1
On both side edges of 0 and 20, connecting portions with the other party are provided. In this embodiment, the first connecting member 11 is provided on the first half cylindrical member 10 and the second connecting member 11 is provided on the second half cylindrical member 20. Only the coupling means 21 is provided. In this embodiment, the same operation and effect as those of the first embodiment can be obtained.

[0019]

As described above, the pipe joint according to the first aspect has the first coupling means 11 and the second coupling means 21 which are engaged with each other as coupling parts, and the first coupling means 11 is the first locking surface 1.
2, on the mating surface 14 side of the half-cylinder members 10 and 20, there is provided a first inclined surface 13 that is inclined away from the center of the half-cylinder members 10 and 20 as approaching the first locking surface 12. The coupling means 21 is connected to the second locking surface 22 with respect to the half cylindrical members 10, 20.
On the side opposite to the mating surface 14, there is provided a second inclined surface 23 which is inclined so as to be closer to the center of the half-cylinder members 10 and 20 as it approaches the second locking surface 22. Therefore, the first inclined surface 13 and the second
When the inclined surfaces 23 are in contact with each other, that is, when the pipe joint is in an incompletely assembled state, a force acts in a direction in which the inclined surfaces repel each other (a direction opposite to the fitting direction). Since the half-cylinder members 10 and 20 are separated from each other, it is possible to clearly distinguish whether the assembly of the pipe joint is complete or incomplete. Further, in the pipe joint of the present invention, the inclined surface has a convex curved shape.
The first and second inclined surfaces abut on the surface by being formed on the surface
Therefore, the above effect is more exhibited. Therefore, according to the first aspect of the present invention, it is possible to provide a pipe joint which can prevent a poor fitting due to an assembly operation error.

In the pipe joint according to the second aspect, the other half-cylinder member 1 is provided in a state where the first and second inclined surfaces 13 and 23 are in contact with each other.
Since the temporary fixing angle 26 that sandwiches and holds 0 and 20 is extended from the second inclined surface 23 of the second coupling means 21 to the distal end side, the sliding on the inclined surfaces 13 and 23 is performed at the temporary fixing angle 26. Is prevented. Therefore, according to the second aspect of the present invention, it is possible to provide a pipe joint which can prevent the poor fitting and facilitate the fitting operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of FIG.

FIG. 2 is a right side view showing the embodiment of the pipe joint according to the present invention.

FIG. 3 is a front view showing a state where a pipe with a spiral wave is connected by the pipe joint of FIG. 1;

FIG. 4 is a right side view showing a state in which a pipe with a spiral wave is connected by the pipe joint of FIG. 1;

FIG. 5 is a cross-sectional view showing an engagement state (poor fitting) between a first inclined surface and a second inclined surface.

FIG. 6 is a sectional view showing a state in which the first locking means is pressed by a temporary fixing angle.

FIG. 7 is a front view showing an embodiment of the pipe joint according to the present invention.

FIG. 8 is a right side view of the pipe joint of FIG. 7;

FIG. 9 is a sectional view taken in the direction of the arrow in FIG. 10;

FIG. 10 is a right side view showing a conventional pipe joint.

FIG. 11 is a cross-sectional view showing a state in which a conventional pipe joint is not properly fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 (1st) half cylinder member 11 1st coupling means 12 1st latching surface 13 1st inclined surface 14 mating surface 20 (2nd) half cylinder member 21 2nd coupling means 22 2nd latching surface 23 2nd inclination Surface 25 Extension 26 Temporary fixing angle 27 Window 30 (Wave) tube 31 Valley of corrugated tube 32 Packing layer 41 Convex portion 42 Concave portion 53 Inclined surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 62-86490 (JP, U) JP-A 57-11384 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16L 33/00

Claims (2)

(57) [Claims] 1. A combination of two half-cylinder members (10, 20) covering a connecting pipe (30) by a half circumference, and a first coupling means (11) is provided on one half-cylinder member (10).
Then, a second coupling means (21) is provided on the other half cylinder member (20).
The two half-cylinder members (10, 20)
When combined at (14, 14), the first coupling means (11)
Engagement with the second coupling means (21) results in two half-cylinder members
In the pipe joint for fixing (10, 20), the first coupling means (11) is provided on one side of the half cylindrical member (10).
A first locking surface (12) located on the
From the surface (12) to the mating surface (14) of the half-cylinder member (10)
A closer portion is provided with a first inclined surface (13) which is inclined so as to be away from the center of the half-cylinder member (10) as it approaches the first locking surface (12) , and the second coupling means ( 21) is related to the first locking surface (12).
A hook-shaped member having a mating second locking surface (22);
The mating surface (14) opposite the portion of the semi-cylindrical member relates second locking face (22) (20), closer to the second locking surface (22) on the center side in the semi-cylindrical member (20) A second inclined surface (23) which is inclined so as to approach the first inclined surface (13) and the second inclined surface (23).
At least one of which has a convex curved surface.
Fittings. 2. A temporary fixing angle (26) for holding the other half cylindrical member (10, 20) in a state where the first and second inclined surfaces (13, 23) are in contact with each other is formed by a second coupling. Means (2
2. The pipe joint according to claim 1, wherein the pipe joint extends from the second inclined surface (23) to the distal end side.