JP2571957Y2 - Corrugated pipe with fitting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated pipe with a joint, and more particularly to an improvement of a corrugated pipe with a joint used for a cable protection tube and the like.

[0002]

2. Description of the Related Art Conventionally, there are two types of corrugated pipes generally used as cable protection pipes, one having an annular unevenness and the other having a spiral unevenness. When connecting these corrugated pipes, as shown in FIG. 5, in the case of a corrugated pipe A having annular concavities and convexities, the other end C is inserted into a sleeve-shaped receiving hole B formed at one end, and one of the concavo-convex strips D is formed.
In this case, a rubber ring E for sealing is inserted into the corrugated pipe E, and in the case of a corrugated pipe A having spiral irregularities, the other end C is screwed into one end B as shown in FIG. A connection is made.

Incidentally, in the case of the connecting means for the corrugated pipe A having the annular unevenness shown in FIG. 5 described above, if the pulling force is applied as it is, there is a possibility that the opening may come off. There is a drawback that the connection work is complicated because it is necessary to provide the preventive device F. In the case of the spiral unevenness shown in FIG. 6, one of the corrugated pipes needs to be rotated around the axis, and a long corrugated pipe is required. There was a drawback that it was not easy to rotate.

In view of these drawbacks, the applicant of the present invention has previously proposed a corrugated pipe with a joint which can be easily connected and has an excellent detachment prevention effect (Japanese Patent Application Laid-Open No. 2-240494). This improved corrugated pipe with a joint has an arrowhead-shaped step-shaped tapered portion C1 formed at the tip of the insertion port C as shown in FIG. In addition to the above configuration, the separation is not easily performed, and the mounting groove B2 of the rubber ring E for sealing is formed on the inner surface of the receiving port B, and the rubber ring E stored here is pressed against the outer periphery of the insertion port C to seal the seal. It is configured to do so.

[0005]

However, the improved corrugated pipe with a joint can be connected with one touch, and the stepped taper portion C1 of the arrowhead-shaped insertion port C and the receiving stepped portion B1 are disengaged. Is almost completely prevented, but since the mounting groove B2 for the sealing rubber ring E is provided on the inner surface of the receiving port B, a smooth cylindrical portion where the sealing rubber ring E comes into contact with the corresponding opening C portion. CL needs to be formed with a considerable extension length, the insertion opening C becomes longer, the effective effective length of the corrugated pipe A is reduced by that much, and the smooth cylindrical portion CL is formed.
Has a considerably weaker flattening strength than that of the corrugated portion A, and there is a problem that stress concentration may cause bending failure.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a corrugated pipe with a joint which can be easily connected, has an excellent effect of preventing disengagement, and can sufficiently increase the strength and substantially effective length of a joint portion. It was done for the purpose of doing.

[0007]

[Devised OBJECT AND RESOLUTION use Namely, corrugated pipe with this invention the joint is at one end of the corrugated tube, said corrugated
A tapered diameter-reduced portion is formed in series with the concave and convex portions of the tube, and the tip of the tip is stepwise enlarged, and furthermore, an insertion hole having an arrowhead-like projection shape formed by tapering the tip is integrally formed, At the other end of the corrugated pipe, a receptacle formed on the innermost inner surface with a projection that engages with the step-shaped enlarged portion of the insertion opening having the arrowhead-like projection shape is integrally formed, and the length of the receptacle is set to the length described above. obtaining covers at least one recess of the concave-convex portion of the corrugated tube connected to the spigot back end is a length, that the rubber ring in the recess join the club outer surface for sealing between the socket inner surface is formed by instrumentation wear It is a feature.

[0008]

Next, an embodiment of the present invention will be described. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a joined state of the embodiment, FIG. 3 is a radial cross-sectional view of the embodiment, and FIG. 4 is a radial cross-sectional view of another embodiment. . The corrugated pipe 1 with a joint according to the invention has a tapered portion 3A which is tapered and connected to one end 2 of the corrugated pipe 1 having an annular unevenness 1A formed on the outer periphery. An insertion hole 3 having an arrowhead-like projection shape formed by having a step-shaped enlarged portion 3B having an enlarged diameter, and a reduced-diameter portion 3C whose tip is tapered.
Are formed integrally with each other, and the other end 4 of the corrugated pipe 1 is engaged with a stepped enlarged portion 3B of the insertion opening 3 having an arrowhead-like projection shape.
The receiving port 6 formed on the innermost inner surface 6A is integrally formed, and the length L of the receiving port 6 can cover at least one concave portion 1a of the uneven portion 1A of the corrugated pipe 1 connected to the rear end of the insertion opening 3. is a is L, and is constituted by the rubber ring 7 GaSo wearing for sealing between the socket 6 the inner surface in the recess 1a outer surface.

In the above embodiment, the circumferential section of the engaging projection 5 on the inner surface of the receptacle 6 is, for example, a triangular section as shown in FIG. 3, and the axial section is shown in FIG.
As shown in FIG. 7, one side forms an inclined piece 5B that slides on the step-shaped enlarged portion 3B of the arrowhead-shaped insertion opening 3, and the other surface forms an engagement step 5A with the step-shaped enlarged portion 3B.

In the above embodiment, the case where the protrusions 5 in the inner diameter direction of the inner surface of the receiving port 6 are arranged in the circumferential direction without any gap is shown.
However, the present invention is not limited to this, and it may be formed so as to protrude every other or every two (every other in the illustrated example) as shown in FIG. Further, the opening end 3D of the insertion opening 3 may be formed by bending in the outer diameter direction as shown in FIG. 1 or FIG. In this case, the insertion end 3D of the cable (not shown) inserted inside after the connection
It is convenient because it can be prevented from getting stuck.

[0011]

When connecting the corrugated pipe 1 with a joint according to the present invention, first, a sealing rubber ring 7 is attached to the recessed portion 1a connected to the insertion opening 3, and as shown in FIG. , And strongly push in the axial direction to mutually engage
B and 5A are deformed to get over, and the engagement steps 3B and 5A are engaged. Therefore, detachment is easily prevented after this engagement is achieved. Further, in this case, the inner surface of the receiving port 6 and the outer periphery of the insertion port 3 are sealed by a sealing rubber ring 7. Moreover, the receiving port 6 only needs to have a length L that can reach the sealing rubber ring 7, and the inserting port 3 does not need any straight pipe part. And it is sufficiently reinforced by the diameter change portion such as the engagement step 3B.

[0012]

As described above, the corrugated pipe 1 with a joint according to the present invention uses the outer surface of the concave portion 1a of the corrugated unevenness connected to the insertion opening 3 as a mounting groove for the rubber ring 7 for sealing. It is not necessary to provide a rubber ring mounting groove, and it is no longer necessary to provide a straight pipe portion in the insertion port 3.
The flatness of the corrugated pipe can be improved, and the effective length of the corrugated pipe does not decrease due to the absence of a straight pipe. It demonstrates.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a bonding state of the embodiment.

FIG. 3 is a radial sectional view of the embodiment.

FIG. 4 is a radial cross-sectional view of another embodiment.

FIG. 5 is a cross-sectional view of a conventional example of a corrugated pipe with a joint provided with annular irregularities.

FIG. 6 is a cross-sectional view of a conventional example of a corrugated pipe with a joint provided with spiral irregularities.

FIG. 7 is a cross-sectional view of a conventional example of a corrugated pipe with a joint provided with an arrowhead-shaped insertion hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated pipe with a joint 2 One end 3 Insertion having an arrowhead-shaped projection shape 3A Reduced diameter portion 3B Stepped enlarged diameter portion 3C Reduced diameter portion 4 Other end 5 Projection 6 Receptacle 6A Innermost inner surface 7 Rubber ring for sealing

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toru Noda 64 Ishizukita-cho, Sakai-shi, Osaka Kubota Co., Ltd. Inside the vinyl pipe plant (56) References JP-A-61-293821 (JP, A) JP-A-2 −240494 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. The corrugated pipe is provided at one end with the corrugated pipe.
The corrugated pipe is formed integrally with an insertion opening having an arrowhead-shaped projection shape formed by forming a tapered reduced diameter portion in series with the uneven portion, expanding the tip in a stepped shape, and further reducing the tip in a tapered shape. At the other end, a projection formed on the innermost surface of the innermost surface is formed with a projection that engages with the step-shaped enlarged portion of the projection forming the arrowhead-shaped projection. obtaining covers at least one recess of the concave-convex portion of the corrugated tube connected with the back end is a length, and wherein the rubber ring in the recess join the club outer surface for sealing between the socket inner surface is formed by instrumentation wear Corrugated pipe with fitting.