JPH0320626Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a connecting device for pipe members that allows adjacent connected pipe members to be bent by changing their axial directions.

<Prior art> As is well known, when installing power lines, communication lines, etc. underground or inside concrete buildings, the above wires are passed through protective pipes buried underground. There is. When the wiring is bent in the vertical, horizontal, or diagonal directions, a bendable pipe connecting device or flexible pipe is used in the bent portion.

As a connection device for this bendable pipe material, for example, a flexible pipe connection structure shown in Japanese Utility Model Application Publication No. 60-54884 can be used.

This flexible pipe forms a short pipe by forming an enlarged diameter part at the end of a straight pipe part, and sequentially connects the enlarged diameter parts of the adjacent short pipes with a connecting pipe material having a packing layer on the inner surface, It is made bendable by changing the axial direction of adjacent tubes.

<Problems to be solved by the invention> However, the conventional flexible pipe connection structure described above is expensive because it requires the use of two different members, the short pipe and the connecting pipe material. It has become uneconomical, and when connecting short pipes with connecting pipe materials, a packing layer must be formed on the inner periphery of the connecting pipe materials, making assembly complicated and requiring the use of molds, etc. to press the connecting pipe materials. It required special tools, took time to connect, and caused problems with poor work efficiency.

<Means for Solving the Problems> The present invention was devised to solve the above-mentioned problems, and is a pipe connecting device that enables bending by changing the axial direction of connected adjacent pipes. , forming a pipe material by forming an enlarged diameter part at one end of a straight pipe part and a flange part at the other end, and providing a packing on the peripheral end of the flange part that makes elastic contact with the inner surface of the enlarged diameter part of the adjacent pipe material, The inner surface of the enlarged diameter portion is configured as an arcuate curved surface centered on a center point set approximately at the widthwise center of the enlarged diameter portion on the axis.

<Function> Since the present invention adopts the above-described configuration, the flange portion formed at the other end of the straight pipe portion of the tube material can freely tilt within the enlarged diameter portion formed at one end,
Since the trajectory drawn by the circumferential edge of the flange portion and the shape of the inner circumferential surface of the enlarged diameter portion match, the packing at the circumferential edge of the flange portion will remain in the enlarged diameter portion regardless of the angular position of the adjacent pipe materials. It is possible to make elastic contact with the inner surface of the tube material and to connect it in a bendable manner by changing the axial direction of the tube material.

<Example> The present invention will be explained below based on the drawings of the example.

First, the tube connecting device 1 of the present invention is capable of bending adjacent tubes 2 that are connected by changing their axial directions.

The tube material 2 has a short tube structure including a straight tube section 3 with an enlarged diameter section 4 at one end and an outer flange section 6 at the other end.

The inner surface of the enlarged diameter portion 4 is located on the axis l.
An arcuate curved surface 5 having a radius r centered on a center point O set approximately at the center of the width W of is formed.

On the other hand, the flange portion 6 has an outer flange shape with an outer diameter φ' and is open in the shape of a flap, and a ring-shaped packing 7 is provided at the peripheral end of the flange portion 6 to come into elastic contact with the inner surface of the enlarged diameter portion 4 of the adjacent tube material 2. The outer diameter of the packing 7 is φ
is equal to twice the radius r of the arcuate curved surface 5 described above.

The gasket 7 has a ring shape in which a pair of seal strips 9 are provided around the outer edge of a fitting portion 8 that is attached to the flange portion 6 with a gap 10 formed therein. When fitted into the enlarged diameter section 4 of the matching tube material 2, the respective protruding end surfaces of the pair of seal strips 9 come into elastic contact with the inner surface of the enlarged diameter section 4 and come into close contact.

A gap 10 is formed between the pair of seal strips 9, and this gap 10 is sealed by the pair of seal strips 9 and the inner surface of the enlarged diameter portion 4. This forms a kind of suction cup structure, and elastic contact with the inner surface of the enlarged diameter portion 4 is extremely effectively achieved.

In the fitting portion between the flange portion 6 and the enlarged diameter portion 4 of the adjacent tube material 2, the inner surface of the enlarged diameter portion 4 is an arcuate curved surface 5 with a radius r centered on the center point O, and the outer surface of the packing 7 of the flange portion 6 is Since the diameter φ is twice the radius r of this arcuate curved surface 5, one of the adjacent pipe materials 2 is
It can be tilted freely relative to the other, and since the locus drawn by the peripheral end of the flange portion 6 and the shape of the arcuate curved surface 5, which is the inner peripheral surface of the enlarged diameter portion 4, match, adjacent pipe materials do not touch each other. At a certain angular position, the packing 7 at the peripheral end of the flange portion 6 comes into elastic contact with the inner surface of the enlarged diameter portion 4, and the axial direction of the tube material can be changed to form a bendable connection.

In addition, when bending the pipe material described above, the flange portion 6
Since this has an outer flange shape that opens in the shape of a flap with respect to the straight pipe portion 3, the cable 11 passing inside will not be bent abruptly. In addition, the end edge 4 of the enlarged diameter portion 4
Since a comes into contact with the outer surface of the straight pipe section 3 of the adjacent pipe material and acts as a stopper, the bending angle of the adjacent pipe material can be appropriately limited, and the cable 11 will not be bent beyond the allowable radius of curvature. . Therefore,
There is no risk that the cable 11 will be damaged at the bend or that its electrical characteristics will deteriorate.

Furthermore, due to the above-described action as a stopper, the flange portions 6 of adjacent tube members 2 will not come off from the enlarged diameter portion 4 in the first place.

In addition, in the present invention, if the pipe material 2 is formed of thicker metal, the physical strength such as impact resistance, earthquake resistance, and tensile strength will be significantly improved. When covered with a film and bonded tightly by heat, it has excellent weather resistance and water resistance.

In the configuration of the present invention described above, adjacent pipe materials 2
In order to fit the flange part 6 into the enlarged diameter part 4, the flange part 6 is formed in advance at one end of the pipe material 2, and a packing 7 is provided, and at the same time, a flange-shaped part larger than the flange part 6 is attached to the other end of the pipe material 2. After forming the enlarged diameter portion and inserting the flange portion 6 of the adjacent tube material 2 into the flared enlarged diameter portion, it is pressed from the outside with a mold to form the enlarged diameter portion 4 with an arcuate inner surface.

Although the present invention has been described above with reference to the embodiments shown in the drawings, the present invention is not limited to the above-described embodiments, and may be implemented in any manner as long as the configuration described in the claims for utility model registration is not changed. can.

<Effects of the invention> In summary, according to the invention, pipes of the same configuration can be easily connected and can be bent freely, so power lines, communication lines, etc. can be routed underground. Highly effective as a bent part of buried protection tubes. Moreover, it can be used in any situation and can also cope with ground subsidence. In addition, in the present invention, the flange part of the pipe material is always in close contact with the inner surface of the enlarged diameter part through the packing, and this contact is achieved by the suction cup action, so that the flange part of the pipe material is always in close contact with the inner surface of the enlarged diameter part. Watertightness can be maintained. Therefore, even if you are in a damp underground area where groundwater gushes out, or even if you are in a sandy area,
Water and sand grains do not enter the pipe material, making it effective as a connecting device for pipe materials for protecting wiring. Furthermore, the present invention can be easily constructed without using special tools, so work efficiency at the construction site is extremely high. , it is possible to construct a flexible tube that can be freely bent to a desired length, and has high practical value.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical sectional view in a straight state, FIG. 2 is a vertical sectional view in a bent state, and FIG. 3 is a partially cutaway plan view in a connected state. Explanation of the symbols: 1 is the pipe connecting device, 2 is the pipe material,
4 is an enlarged diameter portion, 5 is an arcuate curved surface, 6 is a flange portion, 7
is Patsukin.

Claims (1)

[Scope of utility model registration request] In a pipe connecting device that enables bending by changing the axial direction of connected adjacent pipes, the pipe is constructed by forming an enlarged diameter part at one end of a straight pipe part and a flange part at the other end, and the flange At the circumferential end of the section, a packing is provided that elastically contacts the inner surface of the enlarged diameter section of the adjacent pipe material, and the inner surface of the enlarged diameter section is provided with a center point set approximately at the center of the enlarged diameter section on the axis in the width direction of the enlarged diameter section. A pipe connecting device consisting of an arcuate curved surface at the center.